src/modules/m_spanningtree.cpp

   1 /*   +------------------------------------+
   2  *   | Inspire Internet Relay Chat Daemon |
   3  *   +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                     E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 /* $ModDesc: Povides a spanning tree server link protocol */
  18
  19 #include "configreader.h"
  20 #include "users.h"
  21 #include "channels.h"
  22 #include "modules.h"
  23 #include "commands/cmd_whois.h"
  24 #include "commands/cmd_stats.h"
  25 #include "socket.h"
  26 #include "inspircd.h"
  27 #include "wildcard.h"
  28 #include "xline.h"
  29 #include "aes.h"
  30
  31 /** If you make a change which breaks the protocol, increment this.
  32  * If you  completely change the protocol, completely change the number.
  33  */
  34 const long ProtocolVersion = 1101;
  35
  36 /*
  37  * The server list in InspIRCd is maintained as two structures
  38  * which hold the data in different ways. Most of the time, we
  39  * want to very quicky obtain three pieces of information:
  40  *
  41  * (1) The information on a server
  42  * (2) The information on the server we must send data through
  43  *     to actually REACH the server we're after
  44  * (3) Potentially, the child/parent objects of this server
  45  *
  46  * The InspIRCd spanning protocol provides easy access to these
  47  * by storing the data firstly in a recursive structure, where
  48  * each item references its parent item, and a dynamic list
  49  * of child items, and another structure which stores the items
  50  * hashed, linearly. This means that if we want to find a server
  51  * by name quickly, we can look it up in the hash, avoiding
  52  * any O(n) lookups. If however, during a split or sync, we want
  53  * to apply an operation to a server, and any of its child objects
  54  * we can resort to recursion to walk the tree structure.
  55  * Any socket can have one of five states at any one time.
  56  * The LISTENER state indicates a socket which is listening
  57  * for connections. It cannot receive data itself, only incoming
  58  * sockets.
  59  * The CONNECTING state indicates an outbound socket which is
  60  * waiting to be writeable.
  61  * The WAIT_AUTH_1 state indicates the socket is outbound and
  62  * has successfully connected, but has not yet sent and received
  63  * SERVER strings.
  64  * The WAIT_AUTH_2 state indicates that the socket is inbound
  65  * (allocated by a LISTENER) but has not yet sent and received
  66  * SERVER strings.
  67  * The CONNECTED state represents a fully authorized, fully
  68  * connected server.
  69  */
  70 enum ServerState { LISTENER, CONNECTING, WAIT_AUTH_1, WAIT_AUTH_2, CONNECTED };
  71
  72 /* Foward declarations */
  73 class TreeServer;
  74 class TreeSocket;
  75 class Link;
  76 class ModuleSpanningTree;
  77
  78 /* This hash_map holds the hash equivalent of the server
  79  * tree, used for rapid linear lookups.
  80  */
  81 typedef nspace::hash_map<std::string, TreeServer*, nspace::hash<string>, irc::StrHashComp> server_hash;
  82
  83
  84 /** The Link class might as well be a struct,
  85  * but this is C++ and we don't believe in structs (!).
  86  * It holds the entire information of one <link>
  87  * tag from the main config file. We maintain a list
  88  * of them, and populate the list on rehash/load.
  89  */
  90 class Link : public classbase
  91 {
  92  public:
  93         irc::string Name;
  94         std::string IPAddr;
  95         int Port;
  96         std::string SendPass;
  97         std::string RecvPass;
  98         unsigned long AutoConnect;
  99         time_t NextConnectTime;
 100         std::string EncryptionKey;
 101         bool HiddenFromStats;
 102         std::string FailOver;
 103 };
 104
 105 /** Contains helper functions and variables for this module,
 106  * and keeps them out of the global namespace
 107  */
 108 class SpanningTreeUtilities
 109 {
 110  private:
 111         /** Creator server
 112          */
 113         InspIRCd* ServerInstance;
 114  public:
 115         /** Creator module
 116          */
 117         ModuleSpanningTree* Creator;
 118         /** Flatten links and /MAP for non-opers
 119          */
 120         bool FlatLinks;
 121         /** Hide U-Lined servers in /MAP and /LINKS
 122          */
 123         bool HideULines;
 124         /** Announce TS changes to channels on merge
 125          */
 126         bool AnnounceTSChange;
 127         /** Socket bindings for listening sockets
 128          */
 129         std::vector<TreeSocket*> Bindings;
 130         /** This variable represents the root of the server tree
 131          */
 132         TreeServer *TreeRoot;
 133         /** IPs allowed to link to us
 134          */
 135         std::vector<std::string> ValidIPs;
 136         /** Hash of currently connected servers by name
 137          */
 138         server_hash serverlist;
 139         /** Holds the data from the <link> tags in the conf
 140          */
 141         std::vector<Link> LinkBlocks;
 142
 143         /** Initialise utility class
 144          */
 145         SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* Creator);
 146         /** Destroy class and free listeners etc
 147          */
 148         ~SpanningTreeUtilities();
 149         /** Send a message from this server to one other local or remote
 150          */
 151         bool DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target);
 152         /** Send a message from this server to all but one other, local or remote
 153          */
 154         bool DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit);
 155         /** Send a message from this server to all but one other, local or remote
 156          */
 157         bool DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit);
 158         /** Send a message from this server to all others
 159          */
 160         bool DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params);
 161         /** Send a message from this server to all others
 162          */
 163         bool DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params);
 164         /** Send a message from this server to all others, without doing any processing on the command (e.g. send it as-is with colons and all)
 165          */
 166         bool DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params);
 167         /** Read the spanningtree module's tags from the config file
 168          */
 169         void ReadConfiguration(bool rebind);
 170         /** Add a server to the server list for GetListOfServersForChannel
 171          */
 172         void AddThisServer(TreeServer* server, std::deque<TreeServer*> &list);
 173         /** Compile a list of servers which contain members of channel c
 174          */
 175         void GetListOfServersForChannel(chanrec* c, std::deque<TreeServer*> &list);
 176         /** Find a server by name
 177          */
 178         TreeServer* FindServer(const std::string &ServerName);
 179         /** Find a route to a server by name
 180          */
 181         TreeServer* BestRouteTo(const std::string &ServerName);
 182         /** Find a server by glob mask
 183          */
 184         TreeServer* FindServerMask(const std::string &ServerName);
 185         /** Returns true if this is a server name we recognise
 186          */
 187         bool IsServer(const std::string &ServerName);
 188         /** Attempt to connect to the failover link of link x
 189          */
 190         void DoFailOver(Link* x);
 191         /** Find a link tag from a server name
 192          */
 193         Link* FindLink(const std::string& name);
 194 };
 195
 196
 197 /** Each server in the tree is represented by one class of
 198  * type TreeServer. A locally connected TreeServer can
 199  * have a class of type TreeSocket associated with it, for
 200  * remote servers, the TreeSocket entry will be NULL.
 201  * Each server also maintains a pointer to its parent
 202  * (NULL if this server is ours, at the top of the tree)
 203  * and a pointer to its "Route" (see the comments in the
 204  * constructors below), and also a dynamic list of pointers
 205  * to its children which can be iterated recursively
 206  * if required. Creating or deleting objects of type
 207  i* TreeServer automatically maintains the hash_map of
 208  * TreeServer items, deleting and inserting them as they
 209  * are created and destroyed.
 210  */
 211 class TreeServer : public classbase
 212 {
 213         InspIRCd* ServerInstance;               /* Creator */
 214         TreeServer* Parent;                     /* Parent entry */
 215         TreeServer* Route;                      /* Route entry */
 216         std::vector<TreeServer*> Children;      /* List of child objects */
 217         irc::string ServerName;                 /* Server's name */
 218         std::string ServerDesc;                 /* Server's description */
 219         std::string VersionString;              /* Version string or empty string */
 220         int UserCount;                          /* Not used in this version */
 221         int OperCount;                          /* Not used in this version */
 222         TreeSocket* Socket;                     /* For directly connected servers this points at the socket object */
 223         time_t NextPing;                        /* After this time, the server should be PINGed*/
 224         bool LastPingWasGood;                   /* True if the server responded to the last PING with a PONG */
 225         SpanningTreeUtilities* Utils;           /* Utility class */
 226
 227  public:
 228
 229         /** We don't use this constructor. Its a dummy, and won't cause any insertion
 230          * of the TreeServer into the hash_map. See below for the two we DO use.
 231          */
 232         TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance) : ServerInstance(Instance), Utils(Util)
 233         {
 234                 Parent = NULL;
 235                 ServerName = "";
 236                 ServerDesc = "";
 237                 VersionString = "";
 238                 UserCount = OperCount = 0;
 239                 VersionString = ServerInstance->GetVersionString();
 240         }
 241
 242         /** We use this constructor only to create the 'root' item, Utils->TreeRoot, which
 243          * represents our own server. Therefore, it has no route, no parent, and
 244          * no socket associated with it. Its version string is our own local version.
 245          */
 246         TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance, std::string Name, std::string Desc) : ServerInstance(Instance), ServerName(Name.c_str()), ServerDesc(Desc), Utils(Util)
 247         {
 248                 Parent = NULL;
 249                 VersionString = "";
 250                 UserCount = OperCount = 0;
 251                 VersionString = ServerInstance->GetVersionString();
 252                 Route = NULL;
 253                 Socket = NULL; /* Fix by brain */
 254                 AddHashEntry();
 255         }
 256
 257         /** When we create a new server, we call this constructor to initialize it.
 258          * This constructor initializes the server's Route and Parent, and sets up
 259          * its ping counters so that it will be pinged one minute from now.
 260          */
 261         TreeServer(SpanningTreeUtilities* Util, InspIRCd* Instance, std::string Name, std::string Desc, TreeServer* Above, TreeSocket* Sock)
 262                 : ServerInstance(Instance), Parent(Above), ServerName(Name.c_str()), ServerDesc(Desc), Socket(Sock), Utils(Util)
 263         {
 264                 VersionString = "";
 265                 UserCount = OperCount = 0;
 266                 this->SetNextPingTime(time(NULL) + 60);
 267                 this->SetPingFlag();
 268
 269                 /* find the 'route' for this server (e.g. the one directly connected
 270                  * to the local server, which we can use to reach it)
 271                  *
 272                  * In the following example, consider we have just added a TreeServer
 273                  * class for server G on our network, of which we are server A.
 274                  * To route traffic to G (marked with a *) we must send the data to
 275                  * B (marked with a +) so this algorithm initializes the 'Route'
 276                  * value to point at whichever server traffic must be routed through
 277                  * to get here. If we were to try this algorithm with server B,
 278                  * the Route pointer would point at its own object ('this').
 279                  *
 280                  *              A
 281                  *             / \
 282                  *          + B   C
 283                  *           / \   \
 284                  *          D   E   F
 285                  *         /         \
 286                  *      * G           H
 287                  *
 288                  * We only run this algorithm when a server is created, as
 289                  * the routes remain constant while ever the server exists, and
 290                  * do not need to be re-calculated.
 291                  */
 292
 293                 Route = Above;
 294                 if (Route == Utils->TreeRoot)
 295                 {
 296                         Route = this;
 297                 }
 298                 else
 299                 {
 300                         while (this->Route->GetParent() != Utils->TreeRoot)
 301                         {
 302                                 this->Route = Route->GetParent();
 303                         }
 304                 }
 305
 306                 /* Because recursive code is slow and takes a lot of resources,
 307                  * we store two representations of the server tree. The first
 308                  * is a recursive structure where each server references its
 309                  * children and its parent, which is used for netbursts and
 310                  * netsplits to dump the whole dataset to the other server,
 311                  * and the second is used for very fast lookups when routing
 312                  * messages and is instead a hash_map, where each item can
 313                  * be referenced by its server name. The AddHashEntry()
 314                  * call below automatically inserts each TreeServer class
 315                  * into the hash_map as it is created. There is a similar
 316                  * maintainance call in the destructor to tidy up deleted
 317                  * servers.
 318                  */
 319
 320                 this->AddHashEntry();
 321         }
 322
 323         int QuitUsers(const std::string &reason)
 324         {
 325                 ServerInstance->Log(DEBUG,"Removing all users from server %s",this->ServerName.c_str());
 326                 const char* reason_s = reason.c_str();
 327                 std::vector<userrec*> time_to_die;
 328                 for (user_hash::iterator n = ServerInstance->clientlist.begin(); n != ServerInstance->clientlist.end(); n++)
 329                 {
 330                         if (!strcmp(n->second->server, this->ServerName.c_str()))
 331                         {
 332                                 time_to_die.push_back(n->second);
 333                         }
 334                 }
 335                 for (std::vector<userrec*>::iterator n = time_to_die.begin(); n != time_to_die.end(); n++)
 336                 {
 337                         userrec* a = (userrec*)*n;
 338                         ServerInstance->Log(DEBUG,"Kill %s fd=%d",a->nick,a->GetFd());
 339                         if (!IS_LOCAL(a))
 340                                 userrec::QuitUser(ServerInstance,a,reason_s);
 341                 }
 342                 return time_to_die.size();
 343         }
 344
 345         /** This method is used to add the structure to the
 346          * hash_map for linear searches. It is only called
 347          * by the constructors.
 348          */
 349         void AddHashEntry()
 350         {
 351                 server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
 352                 if (iter == Utils->serverlist.end())
 353                         Utils->serverlist[this->ServerName.c_str()] = this;
 354         }
 355
 356         /** This method removes the reference to this object
 357          * from the hash_map which is used for linear searches.
 358          * It is only called by the default destructor.
 359          */
 360         void DelHashEntry()
 361         {
 362                 server_hash::iterator iter = Utils->serverlist.find(this->ServerName.c_str());
 363                 if (iter != Utils->serverlist.end())
 364                         Utils->serverlist.erase(iter);
 365         }
 366
 367         /** These accessors etc should be pretty self-
 368          * explanitory.
 369          */
 370         TreeServer* GetRoute()
 371         {
 372                 return Route;
 373         }
 374
 375         std::string GetName()
 376         {
 377                 return ServerName.c_str();
 378         }
 379
 380         std::string GetDesc()
 381         {
 382                 return ServerDesc;
 383         }
 384
 385         std::string GetVersion()
 386         {
 387                 return VersionString;
 388         }
 389
 390         void SetNextPingTime(time_t t)
 391         {
 392                 this->NextPing = t;
 393                 LastPingWasGood = false;
 394         }
 395
 396         time_t NextPingTime()
 397         {
 398                 return NextPing;
 399         }
 400
 401         bool AnsweredLastPing()
 402         {
 403                 return LastPingWasGood;
 404         }
 405
 406         void SetPingFlag()
 407         {
 408                 LastPingWasGood = true;
 409         }
 410
 411         int GetUserCount()
 412         {
 413                 return UserCount;
 414         }
 415
 416         void AddUserCount()
 417         {
 418                 UserCount++;
 419         }
 420
 421         void DelUserCount()
 422         {
 423                 UserCount--;
 424         }
 425
 426         int GetOperCount()
 427         {
 428                 return OperCount;
 429         }
 430
 431         TreeSocket* GetSocket()
 432         {
 433                 return Socket;
 434         }
 435
 436         TreeServer* GetParent()
 437         {
 438                 return Parent;
 439         }
 440
 441         void SetVersion(const std::string &Version)
 442         {
 443                 VersionString = Version;
 444         }
 445
 446         unsigned int ChildCount()
 447         {
 448                 return Children.size();
 449         }
 450
 451         TreeServer* GetChild(unsigned int n)
 452         {
 453                 if (n < Children.size())
 454                 {
 455                         /* Make sure they  cant request
 456                          * an out-of-range object. After
 457                          * all we know what these programmer
 458                          * types are like *grin*.
 459                          */
 460                         return Children[n];
 461                 }
 462                 else
 463                 {
 464                         return NULL;
 465                 }
 466         }
 467
 468         void AddChild(TreeServer* Child)
 469         {
 470                 Children.push_back(Child);
 471         }
 472
 473         bool DelChild(TreeServer* Child)
 474         {
 475                 for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
 476                 {
 477                         if (*a == Child)
 478                         {
 479                                 Children.erase(a);
 480                                 return true;
 481                         }
 482                 }
 483                 return false;
 484         }
 485
 486         /** Removes child nodes of this node, and of that node, etc etc.
 487          * This is used during netsplits to automatically tidy up the
 488          * server tree. It is slow, we don't use it for much else.
 489          */
 490         bool Tidy()
 491         {
 492                 bool stillchildren = true;
 493                 while (stillchildren)
 494                 {
 495                         stillchildren = false;
 496                         for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
 497                         {
 498                                 TreeServer* s = (TreeServer*)*a;
 499                                 s->Tidy();
 500                                 Children.erase(a);
 501                                 DELETE(s);
 502                                 stillchildren = true;
 503                                 break;
 504                         }
 505                 }
 506                 return true;
 507         }
 508
 509         ~TreeServer()
 510         {
 511                 /* We'd better tidy up after ourselves, eh? */
 512                 this->DelHashEntry();
 513         }
 514 };
 515
 516 /** Yay for fast searches!
 517  * This is hundreds of times faster than recursion
 518  * or even scanning a linked list, especially when
 519  * there are more than a few servers to deal with.
 520  * (read as: lots).
 521  */
 522 TreeServer* SpanningTreeUtilities::FindServer(const std::string &ServerName)
 523 {
 524         server_hash::iterator iter;
 525         iter = serverlist.find(ServerName.c_str());
 526         if (iter != serverlist.end())
 527         {
 528                 return iter->second;
 529         }
 530         else
 531         {
 532                 return NULL;
 533         }
 534 }
 535
 536 /** Returns the locally connected server we must route a
 537  * message through to reach server 'ServerName'. This
 538  * only applies to one-to-one and not one-to-many routing.
 539  * See the comments for the constructor of TreeServer
 540  * for more details.
 541  */
 542 TreeServer* SpanningTreeUtilities::BestRouteTo(const std::string &ServerName)
 543 {
 544         if (ServerName.c_str() == TreeRoot->GetName())
 545                 return NULL;
 546         TreeServer* Found = FindServer(ServerName);
 547         if (Found)
 548         {
 549                 return Found->GetRoute();
 550         }
 551         else
 552         {
 553                 return NULL;
 554         }
 555 }
 556
 557 /** Find the first server matching a given glob mask.
 558  * Theres no find-using-glob method of hash_map [awwww :-(]
 559  * so instead, we iterate over the list using an iterator
 560  * and match each one until we get a hit. Yes its slow,
 561  * deal with it.
 562  */
 563 TreeServer* SpanningTreeUtilities::FindServerMask(const std::string &ServerName)
 564 {
 565         for (server_hash::iterator i = serverlist.begin(); i != serverlist.end(); i++)
 566         {
 567                 if (match(i->first.c_str(),ServerName.c_str()))
 568                         return i->second;
 569         }
 570         return NULL;
 571 }
 572
 573 /* A convenient wrapper that returns true if a server exists */
 574 bool SpanningTreeUtilities::IsServer(const std::string &ServerName)
 575 {
 576         return (FindServer(ServerName) != NULL);
 577 }
 578
 579
 580 /** Handle /RCONNECT
 581  */
 582 class cmd_rconnect : public command_t
 583 {
 584         Module* Creator;
 585         SpanningTreeUtilities* Utils;
 586  public:
 587         cmd_rconnect (InspIRCd* Instance, Module* Callback, SpanningTreeUtilities* Util) : command_t(Instance, "RCONNECT", 'o', 2), Creator(Callback), Utils(Util)
 588         {
 589                 this->source = "m_spanningtree.so";
 590                 syntax = "<remote-server-mask> <servermask>";
 591         }
 592
 593         CmdResult Handle (const char** parameters, int pcnt, userrec *user)
 594         {
 595                 user->WriteServ("NOTICE %s :*** RCONNECT: Sending remote connect to \002%s\002 to connect server \002%s\002.",user->nick,parameters[0],parameters[1]);
 596                 /* Is this aimed at our server? */
 597                 if (ServerInstance->MatchText(ServerInstance->Config->ServerName,parameters[0]))
 598                 {
 599                         /* Yes, initiate the given connect */
 600                         ServerInstance->SNO->WriteToSnoMask('l',"Remote CONNECT from %s matching \002%s\002, connecting server \002%s\002",user->nick,parameters[0],parameters[1]);
 601                         const char* para[1];
 602                         para[0] = parameters[1];
 603                         std::string original_command = std::string("CONNECT ") + parameters[1];
 604                         Creator->OnPreCommand("CONNECT", para, 1, user, true, original_command);
 605
 606                         return CMD_SUCCESS;
 607                 }
 608
 609                 return CMD_FAILURE;
 610         }
 611 };
 612
 613
 614
 615 /** Every SERVER connection inbound or outbound is represented by
 616  * an object of type TreeSocket.
 617  * TreeSockets, being inherited from InspSocket, can be tied into
 618  * the core socket engine, and we cn therefore receive activity events
 619  * for them, just like activex objects on speed. (yes really, that
 620  * is a technical term!) Each of these which relates to a locally
 621  * connected server is assocated with it, by hooking it onto a
 622  * TreeSocket class using its constructor. In this way, we can
 623  * maintain a list of servers, some of which are directly connected,
 624  * some of which are not.
 625  */
 626 class TreeSocket : public InspSocket
 627 {
 628         SpanningTreeUtilities* Utils;
 629         std::string myhost;
 630         std::string in_buffer;
 631         ServerState LinkState;
 632         std::string InboundServerName;
 633         std::string InboundDescription;
 634         int num_lost_users;
 635         int num_lost_servers;
 636         time_t NextPing;
 637         bool LastPingWasGood;
 638         bool bursting;
 639         AES* ctx_in;
 640         AES* ctx_out;
 641         unsigned int keylength;
 642         std::string ModuleList;
 643         std::map<std::string,std::string> CapKeys;
 644
 645  public:
 646
 647         /** Because most of the I/O gubbins are encapsulated within
 648          * InspSocket, we just call the superclass constructor for
 649          * most of the action, and append a few of our own values
 650          * to it.
 651          */
 652         TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime)
 653                 : InspSocket(SI, host, port, listening, maxtime), Utils(Util)
 654         {
 655                 myhost = host;
 656                 this->LinkState = LISTENER;
 657                 this->ctx_in = NULL;
 658                 this->ctx_out = NULL;
 659         }
 660
 661         TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, std::string ServerName)
 662                 : InspSocket(SI, host, port, listening, maxtime), Utils(Util)
 663         {
 664                 myhost = ServerName;
 665                 this->LinkState = CONNECTING;
 666                 this->ctx_in = NULL;
 667                 this->ctx_out = NULL;
 668         }
 669
 670         /** When a listening socket gives us a new file descriptor,
 671          * we must associate it with a socket without creating a new
 672          * connection. This constructor is used for this purpose.
 673          */
 674         TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip)
 675                 : InspSocket(SI, newfd, ip), Utils(Util)
 676         {
 677                 this->LinkState = WAIT_AUTH_1;
 678                 this->ctx_in = NULL;
 679                 this->ctx_out = NULL;
 680                 this->SendCapabilities();
 681         }
 682
 683         ~TreeSocket()
 684         {
 685                 if (ctx_in)
 686                         DELETE(ctx_in);
 687                 if (ctx_out)
 688                         DELETE(ctx_out);
 689         }
 690
 691         void InitAES(std::string key,std::string SName)
 692         {
 693                 if (key == "")
 694                         return;
 695
 696                 ctx_in = new AES();
 697                 ctx_out = new AES();
 698                 Instance->Log(DEBUG,"Initialized AES key %s",key.c_str());
 699                 // key must be 16, 24, 32 etc bytes (multiple of 8)
 700                 keylength = key.length();
 701                 if (!(keylength == 16 || keylength == 24 || keylength == 32))
 702                 {
 703                         this->Instance->SNO->WriteToSnoMask('l',"\2ERROR\2: Key length for encryptionkey is not 16, 24 or 32 bytes in length!");
 704                         Instance->Log(DEBUG,"Key length not 16, 24 or 32 characters!");
 705                 }
 706                 else
 707                 {
 708                         if (this->GetState() != I_ERROR)
 709                         {
 710                                 this->Instance->SNO->WriteToSnoMask('l',"\2AES\2: Initialized %d bit encryption to server %s",keylength*8,SName.c_str());
 711                                 ctx_in->MakeKey(key.c_str(), "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 712                                         \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", keylength, keylength);
 713                                 ctx_out->MakeKey(key.c_str(), "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
 714                                         \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", keylength, keylength);
 715                         }
 716                 }
 717         }
 718
 719         /** When an outbound connection finishes connecting, we receive
 720          * this event, and must send our SERVER string to the other
 721          * side. If the other side is happy, as outlined in the server
 722          * to server docs on the inspircd.org site, the other side
 723          * will then send back its own server string.
 724          */
 725         virtual bool OnConnected()
 726         {
 727                 if (this->LinkState == CONNECTING)
 728                 {
 729                         /* we do not need to change state here. */
 730                         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 731                         {
 732                                 if (x->Name == this->myhost)
 733                                 {
 734                                         this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] started.");
 735                                         this->SendCapabilities();
 736                                         if (x->EncryptionKey != "")
 737                                         {
 738                                                 if (!(x->EncryptionKey.length() == 16 || x->EncryptionKey.length() == 24 || x->EncryptionKey.length() == 32))
 739                                                 {
 740                                                         this->Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your encryption key is NOT 16, 24 or 32 characters in length, encryption will \2NOT\2 be enabled.");
 741                                                 }
 742                                                 else
 743                                                 {
 744                                                         this->WriteLine(std::string("AES ")+this->Instance->Config->ServerName);
 745                                                         this->InitAES(x->EncryptionKey,x->Name.c_str());
 746                                                 }
 747                                         }
 748                                         /* found who we're supposed to be connecting to, send the neccessary gubbins. */
 749                                         this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+x->SendPass+" 0 :"+this->Instance->Config->ServerDesc);
 750                                         return true;
 751                                 }
 752                         }
 753                 }
 754                 /* There is a (remote) chance that between the /CONNECT and the connection
 755                  * being accepted, some muppet has removed the <link> block and rehashed.
 756                  * If that happens the connection hangs here until it's closed. Unlikely
 757                  * and rather harmless.
 758                  */
 759                 this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2 lost link tag(!)");
 760                 return true;
 761         }
 762
 763         virtual void OnError(InspSocketError e)
 764         {
 765                 /* We don't handle this method, because all our
 766                  * dirty work is done in OnClose() (see below)
 767                  * which is still called on error conditions too.
 768                  */
 769                 if (e == I_ERR_CONNECT)
 770                 {
 771                         this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Connection to \002"+myhost+"\002 refused");
 772                         Link* MyLink = Utils->FindLink(myhost);
 773                         if (MyLink)
 774                                 Utils->DoFailOver(MyLink);
 775                 }
 776         }
 777
 778         virtual int OnDisconnect()
 779         {
 780                 /* For the same reason as above, we don't
 781                  * handle OnDisconnect()
 782                  */
 783                 return true;
 784         }
 785
 786         /** Recursively send the server tree with distances as hops.
 787          * This is used during network burst to inform the other server
 788          * (and any of ITS servers too) of what servers we know about.
 789          * If at any point any of these servers already exist on the other
 790          * end, our connection may be terminated. The hopcounts given
 791          * by this function are relative, this doesn't matter so long as
 792          * they are all >1, as all the remote servers re-calculate them
 793          * to be relative too, with themselves as hop 0.
 794          */
 795         void SendServers(TreeServer* Current, TreeServer* s, int hops)
 796         {
 797                 char command[1024];
 798                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
 799                 {
 800                         TreeServer* recursive_server = Current->GetChild(q);
 801                         if (recursive_server != s)
 802                         {
 803                                 snprintf(command,1024,":%s SERVER %s * %d :%s",Current->GetName().c_str(),recursive_server->GetName().c_str(),hops,recursive_server->GetDesc().c_str());
 804                                 this->WriteLine(command);
 805                                 this->WriteLine(":"+recursive_server->GetName()+" VERSION :"+recursive_server->GetVersion());
 806                                 /* down to next level */
 807                                 this->SendServers(recursive_server, s, hops+1);
 808                         }
 809                 }
 810         }
 811
 812         std::string MyCapabilities()
 813         {
 814                 std::vector<std::string> modlist;
 815                 std::string capabilities = "";
 816
 817                 for (int i = 0; i <= this->Instance->GetModuleCount(); i++)
 818                 {
 819                         if (this->Instance->modules[i]->GetVersion().Flags & VF_COMMON)
 820                                 modlist.push_back(this->Instance->Config->module_names[i]);
 821                 }
 822                 sort(modlist.begin(),modlist.end());
 823                 for (unsigned int i = 0; i < modlist.size(); i++)
 824                 {
 825                         if (i)
 826                                 capabilities = capabilities + ",";
 827                         capabilities = capabilities + modlist[i];
 828                 }
 829                 return capabilities;
 830         }
 831
 832         void SendCapabilities()
 833         {
 834                 irc::commasepstream modulelist(MyCapabilities());
 835
 836                 this->WriteLine("CAPAB START");
 837
 838                 /* Send module names, split at 509 length */
 839                 std::string item = "*";
 840                 std::string line = "CAPAB MODULES ";
 841                 while ((item = modulelist.GetToken()) != "")
 842                 {
 843                         if (line.length() + item.length() + 1 > 509)
 844                         {
 845                                 this->WriteLine(line);
 846                                 line = "CAPAB MODULES ";
 847                         }
 848
 849                         if (line != "CAPAB MODULES ")
 850                                 line.append(",");
 851
 852                         line.append(item);
 853                 }
 854                 if (line != "CAPAB MODULES ")
 855                         this->WriteLine(line);
 856
 857                 int ip6 = 0;
 858                 int ip6support = 0;
 859 #ifdef IPV6
 860                 ip6 = 1;
 861 #endif
 862 #ifdef SUPPORT_IP6LINKS
 863                 ip6support = 1;
 864 #endif
 865                 this->WriteLine("CAPAB CAPABILITIES :NICKMAX="+ConvToStr(NICKMAX)+" HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+" CHANMAX="+ConvToStr(CHANMAX)+" MAXMODES="+ConvToStr(MAXMODES)+" IDENTMAX="+ConvToStr(IDENTMAX)+" MAXQUIT="+ConvToStr(MAXQUIT)+" MAXTOPIC="+ConvToStr(MAXTOPIC)+" MAXKICK="+ConvToStr(MAXKICK)+" MAXGECOS="+ConvToStr(MAXGECOS)+" MAXAWAY="+ConvToStr(MAXAWAY)+" IP6NATIVE="+ConvToStr(ip6)+" IP6SUPPORT="+ConvToStr(ip6support)+" PROTOCOL="+ConvToStr(ProtocolVersion));
 866
 867                 this->WriteLine("CAPAB END");
 868         }
 869
 870         /* Check a comma seperated list for an item */
 871         bool HasItem(const std::string &list, const std::string &item)
 872         {
 873                 irc::commasepstream seplist(list);
 874
 875                 std::string item2 = "*";
 876                 while ((item2 = seplist.GetToken()) != "")
 877                 {
 878                         if (item2 == item)
 879                                 return true;
 880                 }
 881
 882                 return false;
 883         }
 884
 885         /* Isolate and return the elements that are different between two comma seperated lists */
 886         std::string ListDifference(const std::string &one, const std::string &two)
 887         {
 888                 irc::commasepstream list_one(one);
 889                 std::string item = "*";
 890                 std::string result = "";
 891                 while ((item = list_one.GetToken()) != "")
 892                 {
 893                         if (!HasItem(two, item))
 894                         {
 895                                 result.append(" ");
 896                                 result.append(item);
 897                         }
 898                 }
 899                 return result;
 900         }
 901
 902         bool Capab(const std::deque<std::string> &params)
 903         {
 904                 if (params.size() < 1)
 905                 {
 906                         this->WriteLine("ERROR :Invalid number of parameters for CAPAB - Mismatched version");
 907                         return false;
 908                 }
 909
 910                 if (params[0] == "START")
 911                 {
 912                         this->ModuleList = "";
 913                         this->CapKeys.clear();
 914                 }
 915                 else if (params[0] == "END")
 916                 {
 917                         std::string reason = "";
 918                         int ip6support = 0;
 919 #ifdef SUPPORT_IP6LINKS
 920                         ip6support = 1;
 921 #endif
 922                         /* Compare ModuleList and check CapKeys...
 923                          * Maybe this could be tidier? -- Brain
 924                          */
 925                         if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
 926                         {
 927                                 std::string diff = ListDifference(this->ModuleList, this->MyCapabilities());
 928                                 if (!diff.length())
 929                                 {
 930                                         diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList);
 931                                 }
 932                                 else
 933                                 {
 934                                         diff = "this server:" + diff;
 935                                 }
 936                                 if (diff.length() == 12)
 937                                         reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
 938                                 else
 939                                         reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff;
 940                         }
 941
 942                         if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
 943                                 reason = "We don't both support linking to IPV6 servers";
 944
 945                         if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
 946                                 reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
 947
 948                         if (((this->CapKeys.find("NICKMAX") == this->CapKeys.end()) || ((this->CapKeys.find("NICKMAX") != this->CapKeys.end()) && (this->CapKeys.find("NICKMAX")->second != ConvToStr(NICKMAX)))))
 949                                 reason = "Maximum nickname lengths differ or remote nickname length not specified";
 950
 951                         if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion)))))
 952                         {
 953                                 if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end())
 954                                 {
 955                                         reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion);
 956                                 }
 957                                 else
 958                                 {
 959                                         reason = "Protocol version not specified";
 960                                 }
 961                         }
 962
 963                         if (((this->CapKeys.find("HALFOP") == this->CapKeys.end()) && (Instance->Config->AllowHalfop)) || ((this->CapKeys.find("HALFOP") != this->CapKeys.end()) && (this->CapKeys.find("HALFOP")->second != ConvToStr(Instance->Config->AllowHalfop))))
 964                                 reason = "We don't both have halfop support enabled/disabled identically";
 965
 966                         if (((this->CapKeys.find("IDENTMAX") == this->CapKeys.end()) || ((this->CapKeys.find("IDENTMAX") != this->CapKeys.end()) && (this->CapKeys.find("IDENTMAX")->second != ConvToStr(IDENTMAX)))))
 967                                 reason = "Maximum ident lengths differ or remote ident length not specified";
 968
 969                         if (((this->CapKeys.find("CHANMAX") == this->CapKeys.end()) || ((this->CapKeys.find("CHANMAX") != this->CapKeys.end()) && (this->CapKeys.find("CHANMAX")->second != ConvToStr(CHANMAX)))))
 970                                 reason = "Maximum channel lengths differ or remote channel length not specified";
 971
 972                         if (((this->CapKeys.find("MAXMODES") == this->CapKeys.end()) || ((this->CapKeys.find("MAXMODES") != this->CapKeys.end()) && (this->CapKeys.find("MAXMODES")->second != ConvToStr(MAXMODES)))))
 973                                 reason = "Maximum modes per line differ or remote modes per line not specified";
 974
 975                         if (((this->CapKeys.find("MAXQUIT") == this->CapKeys.end()) || ((this->CapKeys.find("MAXQUIT") != this->CapKeys.end()) && (this->CapKeys.find("MAXQUIT")->second != ConvToStr(MAXQUIT)))))
 976                                 reason = "Maximum quit lengths differ or remote quit length not specified";
 977
 978                         if (((this->CapKeys.find("MAXTOPIC") == this->CapKeys.end()) || ((this->CapKeys.find("MAXTOPIC") != this->CapKeys.end()) && (this->CapKeys.find("MAXTOPIC")->second != ConvToStr(MAXTOPIC)))))
 979                                 reason = "Maximum topic lengths differ or remote topic length not specified";
 980
 981                         if (((this->CapKeys.find("MAXKICK") == this->CapKeys.end()) || ((this->CapKeys.find("MAXKICK") != this->CapKeys.end()) && (this->CapKeys.find("MAXKICK")->second != ConvToStr(MAXKICK)))))
 982                                 reason = "Maximum kick lengths differ or remote kick length not specified";
 983
 984                         if (((this->CapKeys.find("MAXGECOS") == this->CapKeys.end()) || ((this->CapKeys.find("MAXGECOS") != this->CapKeys.end()) && (this->CapKeys.find("MAXGECOS")->second != ConvToStr(MAXGECOS)))))
 985                                 reason = "Maximum GECOS (fullname) lengths differ or remote GECOS length not specified";
 986
 987                         if (((this->CapKeys.find("MAXAWAY") == this->CapKeys.end()) || ((this->CapKeys.find("MAXAWAY") != this->CapKeys.end()) && (this->CapKeys.find("MAXAWAY")->second != ConvToStr(MAXAWAY)))))
 988                                 reason = "Maximum awaymessage lengths differ or remote awaymessage length not specified";
 989
 990                         if (reason.length())
 991                         {
 992                                 this->WriteLine("ERROR :CAPAB negotiation failed: "+reason);
 993                                 return false;
 994                         }
 995                 }
 996                 else if ((params[0] == "MODULES") && (params.size() == 2))
 997                 {
 998                         if (!this->ModuleList.length())
 999                         {
1000                                 this->ModuleList.append(params[1]);
1001                         }
1002                         else
1003                         {
1004                                 this->ModuleList.append(",");
1005                                 this->ModuleList.append(params[1]);
1006                         }
1007                 }
1008                 else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
1009                 {
1010                         irc::tokenstream capabs(params[1]);
1011                         std::string item = "*";
1012                         while ((item = capabs.GetToken()) != "")
1013                         {
1014                                 /* Process each key/value pair */
1015                                 std::string::size_type equals = item.rfind('=');
1016                                 if (equals != std::string::npos)
1017                                 {
1018                                         std::string var = item.substr(0, equals);
1019                                         std::string value = item.substr(equals+1, item.length());
1020                                         this->Instance->Log(DEBUG,"Key='%s' Value='%s'",var.c_str(),value.c_str());
1021                                         CapKeys[var] = value;
1022                                 }
1023                         }
1024                 }
1025
1026                 return true;
1027         }
1028
1029         /** This function forces this server to quit, removing this server
1030          * and any users on it (and servers and users below that, etc etc).
1031          * It's very slow and pretty clunky, but luckily unless your network
1032          * is having a REAL bad hair day, this function shouldnt be called
1033          * too many times a month ;-)
1034          */
1035         void SquitServer(std::string &from, TreeServer* Current)
1036         {
1037                 /* recursively squit the servers attached to 'Current'.
1038                  * We're going backwards so we don't remove users
1039                  * while we still need them ;)
1040                  */
1041                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
1042                 {
1043                         TreeServer* recursive_server = Current->GetChild(q);
1044                         this->SquitServer(from,recursive_server);
1045                 }
1046                 /* Now we've whacked the kids, whack self */
1047                 num_lost_servers++;
1048                 num_lost_users += Current->QuitUsers(from);
1049         }
1050
1051         /** This is a wrapper function for SquitServer above, which
1052          * does some validation first and passes on the SQUIT to all
1053          * other remaining servers.
1054          */
1055         void Squit(TreeServer* Current, const std::string &reason)
1056         {
1057                 if ((Current) && (Current != Utils->TreeRoot))
1058                 {
1059                         std::deque<std::string> params;
1060                         params.push_back(Current->GetName());
1061                         params.push_back(":"+reason);
1062                         Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
1063                         if (Current->GetParent() == Utils->TreeRoot)
1064                         {
1065                                 this->Instance->WriteOpers("Server \002"+Current->GetName()+"\002 split: "+reason);
1066                         }
1067                         else
1068                         {
1069                                 this->Instance->WriteOpers("Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
1070                         }
1071                         num_lost_servers = 0;
1072                         num_lost_users = 0;
1073                         std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
1074                         SquitServer(from, Current);
1075                         Current->Tidy();
1076                         Current->GetParent()->DelChild(Current);
1077                         DELETE(Current);
1078                         this->Instance->WriteOpers("Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
1079                 }
1080                 else
1081                 {
1082                         Instance->Log(DEFAULT,"Squit from unknown server");
1083                 }
1084         }
1085
1086         /** FMODE command - server mode with timestamp checks */
1087         bool ForceMode(const std::string &source, std::deque<std::string> &params)
1088         {
1089                 /* Chances are this is a 1.0 FMODE without TS */
1090                 if (params.size() < 3)
1091                 {
1092                         this->WriteLine("ERROR :Version 1.0 FMODE sent to version 1.1 server");
1093                         return false;
1094                 }
1095
1096                 bool smode = false;
1097                 std::string sourceserv;
1098
1099                 /* Are we dealing with an FMODE from a user, or from a server? */
1100                 userrec* who = this->Instance->FindNick(source);
1101                 if (who)
1102                 {
1103                         /* FMODE from a user, set sourceserv to the users server name */
1104                         sourceserv = who->server;
1105                 }
1106                 else
1107                 {
1108                         /* FMODE from a server, create a fake user to receive mode feedback */
1109                         who = new userrec(this->Instance);
1110                         who->SetFd(FD_MAGIC_NUMBER);
1111                         smode = true;           /* Setting this flag tells us we should free the userrec later */
1112                         sourceserv = source;    /* Set sourceserv to the actual source string */
1113                 }
1114                 const char* modelist[64];
1115                 time_t TS = 0;
1116                 int n = 0;
1117                 memset(&modelist,0,sizeof(modelist));
1118                 for (unsigned int q = 0; (q < params.size()) && (q < 64); q++)
1119                 {
1120                         if (q == 1)
1121                         {
1122                                 /* The timestamp is in this position.
1123                                  * We don't want to pass that up to the
1124                                  * server->client protocol!
1125                                  */
1126                                 TS = atoi(params[q].c_str());
1127                         }
1128                         else
1129                         {
1130                                 /* Everything else is fine to append to the modelist */
1131                                 modelist[n++] = params[q].c_str();
1132                         }
1133
1134                 }
1135                 /* Extract the TS value of the object, either userrec or chanrec */
1136                 userrec* dst = this->Instance->FindNick(params[0]);
1137                 chanrec* chan = NULL;
1138                 time_t ourTS = 0;
1139                 if (dst)
1140                 {
1141                         ourTS = dst->age;
1142                 }
1143                 else
1144                 {
1145                         chan = this->Instance->FindChan(params[0]);
1146                         if (chan)
1147                         {
1148                                 ourTS = chan->age;
1149                         }
1150                         else
1151                                 /* Oops, channel doesnt exist! */
1152                                 return true;
1153                 }
1154
1155                 /* TS is equal: Merge the mode changes, use voooodoooooo on modes
1156                  * with parameters.
1157                  */
1158                 if (TS == ourTS)
1159                 {
1160                         Instance->Log(DEBUG,"Entering TS equality check");
1161                         ModeHandler* mh = NULL;
1162                         unsigned long paramptr = 3;
1163                         std::string to_bounce = "";
1164                         std::string to_keep = "";
1165                         std::vector<std::string> params_to_keep;
1166                         std::string params_to_bounce = "";
1167                         bool adding = true;
1168                         char cur_change = 1;
1169                         char old_change = 0;
1170                         char old_bounce_change = 0;
1171                         /* Merge modes, basically do special stuff to mode with params */
1172                         for (std::string::iterator x = params[2].begin(); x != params[2].end(); x++)
1173                         {
1174                                 switch (*x)
1175                                 {
1176                                         case '-':
1177                                                 adding = false;
1178                                         break;
1179                                         case '+':
1180                                                 adding = true;
1181                                         break;
1182                                         default:
1183                                                 if (adding)
1184                                                 {
1185                                                         /* We only care about whats being set,
1186                                                          * not whats being unset
1187                                                          */
1188                                                         mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);
1189
1190                                                         if ((mh) && (mh->GetNumParams(adding) > 0) && (!mh->IsListMode()))
1191                                                         {
1192                                                                 /* We only want to do special things to
1193                                                                  * modes with parameters, we are going to rewrite
1194                                                                  * those parameters
1195                                                                  */
1196                                                                 ModePair ret;
1197                                                                 adding ? cur_change = '+' : cur_change = '-';
1198
1199                                                                 ret = mh->ModeSet(smode ? NULL : who, dst, chan, params[paramptr]);
1200
1201                                                                 /* The mode is set here, check which we should keep */
1202                                                                 if (ret.first)
1203                                                                 {
1204                                                                         bool which_to_keep = mh->CheckTimeStamp(TS, ourTS, params[paramptr], ret.second, chan);
1205
1206                                                                         if (which_to_keep == true)
1207                                                                         {
1208                                                                                 /* Keep ours, bounce theirs:
1209                                                                                  * Send back ours to them and
1210                                                                                  * drop their mode changs
1211                                                                                  */
1212                                                                                 adding ? cur_change = '+' : cur_change = '-';
1213                                                                                 if (cur_change != old_bounce_change)
1214                                                                                         to_bounce += cur_change;
1215                                                                                 to_bounce += *x;
1216                                                                                 old_bounce_change = cur_change;
1217
1218                                                                                 if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
1219                                                                                         params_to_bounce.append(" ").append(ret.second);
1220                                                                         }
1221                                                                         else
1222                                                                         {
1223                                                                                 /* Keep theirs: Accept their mode change,
1224                                                                                  * do nothing else
1225                                                                                  */
1226                                                                                 adding ? cur_change = '+' : cur_change = '-';
1227                                                                                 if (cur_change != old_change)
1228                                                                                         to_keep += cur_change;
1229                                                                                 to_keep += *x;
1230                                                                                 old_change = cur_change;
1231
1232                                                                                 if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
1233                                                                                         params_to_keep.push_back(params[paramptr]);
1234                                                                         }
1235                                                                 }
1236                                                                 else
1237                                                                 {
1238                                                                         /* Mode isnt set here, we want it */
1239                                                                         adding ? cur_change = '+' : cur_change = '-';
1240                                                                         if (cur_change != old_change)
1241                                                                                 to_keep += cur_change;
1242                                                                         to_keep += *x;
1243                                                                         old_change = cur_change;
1244
1245                                                                         if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
1246                                                                                 params_to_keep.push_back(params[paramptr]);
1247                                                                 }
1248
1249                                                                 paramptr++;
1250                                                         }
1251                                                         else
1252                                                         {
1253                                                                 mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);
1254
1255                                                                 if (mh)
1256                                                                 {
1257                                                                         adding ? cur_change = '+' : cur_change = '-';
1258
1259                                                                         /* Just keep this, safe to merge with no checks
1260                                                                          * it has no parameters
1261                                                                          */
1262
1263                                                                         if (cur_change != old_change)
1264                                                                                 to_keep += cur_change;
1265                                                                         to_keep += *x;
1266                                                                         old_change = cur_change;
1267
1268                                                                         if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
1269                                                                         {
1270                                                                                 Instance->Log(DEBUG,"Mode removal %d %d",adding, mh->GetNumParams(adding));
1271                                                                                 params_to_keep.push_back(params[paramptr++]);
1272                                                                         }
1273                                                                 }
1274                                                         }
1275                                                 }
1276                                                 else
1277                                                 {
1278                                                         mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);
1279
1280                                                         if (mh)
1281                                                         {
1282                                                                 /* Taking a mode away */
1283                                                                 adding ? cur_change = '+' : cur_change = '-';
1284
1285                                                                 if (cur_change != old_change)
1286                                                                         to_keep += cur_change;
1287                                                                 to_keep += *x;
1288                                                                 old_change = cur_change;
1289
1290                                                                 if ((mh->GetNumParams(adding) > 0) && (paramptr < params.size()))
1291                                                                         params_to_keep.push_back(params[paramptr++]);
1292                                                         }
1293                                                 }
1294                                         break;
1295                                 }
1296                         }
1297
1298                         if (to_bounce.length())
1299                         {
1300                                 std::deque<std::string> newparams;
1301                                 newparams.push_back(params[0]);
1302                                 newparams.push_back(ConvToStr(ourTS));
1303                                 newparams.push_back(to_bounce+params_to_bounce);
1304                                 Instance->Log(DEBUG,"BOUNCE BACK: %s",(to_bounce+params_to_bounce).c_str());
1305                                 Utils->DoOneToOne(this->Instance->Config->ServerName,"FMODE",newparams,sourceserv);
1306                         }
1307
1308                         if (to_keep.length())
1309                         {
1310                                 unsigned int n = 2;
1311                                 unsigned int q = 0;
1312                                 modelist[0] = params[0].c_str();
1313                                 modelist[1] = to_keep.c_str();
1314
1315                                 if (params_to_keep.size() > 0)
1316                                 {
1317                                         for (q = 0; (q < params_to_keep.size()) && (q < 64); q++)
1318                                         {
1319                                                 Instance->Log(DEBUG,"KEEP Item %d of %d: %s", q, params_to_keep.size(), params_to_keep[q].c_str());
1320                                                 modelist[n++] = params_to_keep[q].c_str();
1321                                         }
1322                                 }
1323
1324                                 if (smode)
1325                                 {
1326                                         Instance->Log(DEBUG,"Send mode");
1327                                         this->Instance->SendMode(modelist, n, who);
1328                                 }
1329                                 else
1330                                 {
1331                                         Instance->Log(DEBUG,"Send mode client");
1332                                         this->Instance->CallCommandHandler("MODE", modelist, n, who);
1333                                 }
1334
1335                                 /* HOT POTATO! PASS IT ON! */
1336                                 Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv);
1337                         }
1338                 }
1339                 else
1340                 /* U-lined servers always win regardless of their TS */
1341                 if ((TS > ourTS) && (!this->Instance->ULine(source.c_str())))
1342                 {
1343                         /* Bounce the mode back to its sender.* We use our lower TS, so the other end
1344                          * SHOULD accept it, if its clock is right.
1345                          *
1346                          * NOTE: We should check that we arent bouncing anything thats already set at this end.
1347                          * If we are, bounce +ourmode to 'reinforce' it. This prevents desyncs.
1348                          * e.g. They send +l 50, we have +l 10 set. rather than bounce -l 50, we bounce +l 10.
1349                          *
1350                          * Thanks to jilles for pointing out this one-hell-of-an-issue before i even finished
1351                          * writing the code. It took me a while to come up with this solution.
1352                          *
1353                          * XXX: BE SURE YOU UNDERSTAND THIS CODE FULLY BEFORE YOU MESS WITH IT.
1354                          */
1355
1356                         std::deque<std::string> newparams;      /* New parameter list we send back */
1357                         newparams.push_back(params[0]);         /* Target, user or channel */
1358                         newparams.push_back(ConvToStr(ourTS));  /* Timestamp value of the target */
1359                         newparams.push_back("");                /* This contains the mode string. For now
1360                                                                  * it's empty, we fill it below.
1361                                                                  */
1362
1363                         /* Intelligent mode bouncing. Don't just invert, reinforce any modes which are already
1364                          * set to avoid a desync here.
1365                          */
1366                         std::string modebounce = "";
1367                         bool adding = true;
1368                         unsigned int t = 3;
1369                         ModeHandler* mh = NULL;
1370                         char cur_change = 1;
1371                         char old_change = 0;
1372                         for (std::string::iterator x = params[2].begin(); x != params[2].end(); x++)
1373                         {
1374                                 /* Iterate over all mode chars in the sent set */
1375                                 switch (*x)
1376                                 {
1377                                         /* Adding or subtracting modes? */
1378                                         case '-':
1379                                                 adding = false;
1380                                         break;
1381                                         case '+':
1382                                                 adding = true;
1383                                         break;
1384                                         default:
1385                                                 /* Find the mode handler for this mode */
1386                                                 mh = this->Instance->Modes->FindMode(*x, chan ? MODETYPE_CHANNEL : MODETYPE_USER);
1387
1388                                                 /* Got a mode handler?
1389                                                  * This also prevents us bouncing modes we have no handler for.
1390                                                  */
1391                                                 if (mh)
1392                                                 {
1393                                                         ModePair ret;
1394                                                         std::string p = "";
1395
1396                                                         /* Does the mode require a parameter right now?
1397                                                          * If it does, fetch it if we can
1398                                                          */
1399                                                         if ((mh->GetNumParams(adding) > 0) && (t < params.size()))
1400                                                                 p = params[t++];
1401
1402                                                         /* Call the ModeSet method to determine if its set with the
1403                                                          * given parameter here or not.
1404                                                          */
1405                                                         ret = mh->ModeSet(smode ? NULL : who, dst, chan, p);
1406
1407                                                         /* XXX: Really. Dont ask.
1408                                                          * Determine from if its set combined with what the current
1409                                                          * 'state' is (adding or not) as to wether we should 'invert'
1410                                                          * or 'reinforce' the mode change
1411                                                          */
1412                                                         (!ret.first ? (adding ? cur_change = '-' : cur_change = '+') : (!adding ? cur_change = '-' : cur_change = '+'));
1413
1414                                                         /* Quickly determine if we have 'flipped' from + to -,
1415                                                          * or - to +, to prevent unneccessary +/- chars in the
1416                                                          * output string that waste bandwidth
1417                                                          */
1418                                                         if (cur_change != old_change)
1419                                                                 modebounce += cur_change;
1420                                                         old_change = cur_change;
1421
1422                                                         /* Add the mode character to the output string */
1423                                                         modebounce += mh->GetModeChar();
1424
1425                                                         /* We got a parameter back from ModeHandler::ModeSet,
1426                                                          * are we supposed to be sending one out right now?
1427                                                          */
1428                                                         if (ret.second.length())
1429                                                         {
1430                                                                 if (mh->GetNumParams(cur_change == '+') > 0)
1431                                                                         /* Yes we're supposed to be sending out
1432                                                                          * the parameter. Make sure it goes
1433                                                                          */
1434                                                                         newparams.push_back(ret.second);
1435                                                         }
1436
1437                                                 }
1438                                         break;
1439                                 }
1440                         }
1441
1442                         /* Update the parameters for FMODE with the new 'bounced' string */
1443                         newparams[2] = modebounce;
1444                         /* Only send it back the way it came, no need to send it anywhere else */
1445                         Utils->DoOneToOne(this->Instance->Config->ServerName,"FMODE",newparams,sourceserv);
1446                         Instance->Log(DEBUG,"FMODE bounced intelligently, our TS less than theirs and the other server is NOT a uline.");
1447                 }
1448                 else
1449                 {
1450                         Instance->Log(DEBUG,"Allow modes, TS lower for sender");
1451                         /* The server was ulined, but something iffy is up with the TS.
1452                          * Sound the alarm bells!
1453                          */
1454                         if ((this->Instance->ULine(sourceserv.c_str())) && (TS > ourTS))
1455                         {
1456                                 this->Instance->WriteOpers("\2WARNING!\2 U-Lined server '%s' has bad TS for '%s' (accepted change): \2SYNC YOUR CLOCKS\2 to avoid this notice",sourceserv.c_str(),params[0].c_str());
1457                         }
1458                         /* Allow the mode, route it to either server or user command handling */
1459                         if (smode)
1460                                 this->Instance->SendMode(modelist,n,who);
1461                         else
1462                                 this->Instance->CallCommandHandler("MODE", modelist, n, who);
1463
1464                         /* HOT POTATO! PASS IT ON! */
1465                         Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv);
1466                 }
1467                 /* Are we supposed to free the userrec? */
1468                 if (smode)
1469                         DELETE(who);
1470
1471                 return true;
1472         }
1473
1474         /** FTOPIC command */
1475         bool ForceTopic(const std::string &source, std::deque<std::string> &params)
1476         {
1477                 if (params.size() != 4)
1478                         return true;
1479                 time_t ts = atoi(params[1].c_str());
1480                 std::string nsource = source;
1481
1482                 chanrec* c = this->Instance->FindChan(params[0]);
1483                 if (c)
1484                 {
1485                         if ((ts >= c->topicset) || (!*c->topic))
1486                         {
1487                                 std::string oldtopic = c->topic;
1488                                 strlcpy(c->topic,params[3].c_str(),MAXTOPIC);
1489                                 strlcpy(c->setby,params[2].c_str(),NICKMAX-1);
1490                                 c->topicset = ts;
1491                                 /* if the topic text is the same as the current topic,
1492                                  * dont bother to send the TOPIC command out, just silently
1493                                  * update the set time and set nick.
1494                                  */
1495                                 if (oldtopic != params[3])
1496                                 {
1497                                         userrec* user = this->Instance->FindNick(source);
1498                                         if (!user)
1499                                         {
1500                                                 c->WriteChannelWithServ(source.c_str(), "TOPIC %s :%s", c->name, c->topic);
1501                                         }
1502                                         else
1503                                         {
1504                                                 c->WriteChannel(user, "TOPIC %s :%s", c->name, c->topic);
1505                                                 nsource = user->server;
1506                                         }
1507                                         /* all done, send it on its way */
1508                                         params[3] = ":" + params[3];
1509                                         Utils->DoOneToAllButSender(source,"FTOPIC",params,nsource);
1510                                 }
1511                         }
1512
1513                 }
1514
1515                 return true;
1516         }
1517
1518         /** FJOIN, similar to TS6 SJOIN, but not quite. */
1519         bool ForceJoin(const std::string &source, std::deque<std::string> &params)
1520         {
1521                 /* 1.1 FJOIN works as follows:
1522                  *
1523                  * Each FJOIN is sent along with a timestamp, and the side with the lowest
1524                  * timestamp 'wins'. From this point on we will refer to this side as the
1525                  * winner. The side with the higher timestamp loses, from this point on we
1526                  * will call this side the loser or losing side. This should be familiar to
1527                  * anyone who's dealt with dreamforge or TS6 before.
1528                  *
1529                  * When two sides of a split heal and this occurs, the following things
1530                  * will happen:
1531                  *
1532                  * If the timestamps are exactly equal, both sides merge their privilages
1533                  * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
1534                  * re-created during a split, this is safe to do.
1535                  *
1536                  *
1537                  * If the timestamps are NOT equal, the losing side removes all privilage
1538                  * modes from all of its users that currently exist in the channel, before
1539                  * introducing new users into the channel which are listed in the FJOIN
1540                  * command's parameters. This means, all modes +ohv, and privilages added
1541                  * by modules, such as +qa. The losing side then LOWERS its timestamp value
1542                  * of the channel to match that of the winning side, and the modes of the
1543                  * users of the winning side are merged in with the losing side. The loser
1544                  * then sends out a set of FMODE commands which 'confirm' that it just
1545                  * removed all privilage modes from its existing users, which allows for
1546                  * services packages to still work correctly without needing to know the
1547                  * timestamping rules which InspIRCd follows. In TS6 servers this is always
1548                  * a problem, and services packages must contain code which explicitly
1549                  * behaves as TS6 does, removing ops from the losing side of a split where
1550                  * neccessary within its internal records, as this state information is
1551                  * not explicitly echoed out in that protocol.
1552                  *
1553                  * The winning side on the other hand will ignore all user modes from the
1554                  * losing side, so only its own modes get applied. Life is simple for those
1555                  * who succeed at internets. :-)
1556                  *
1557                  * NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN,
1558                  * FJOIN does not contain the simple-modes such as +iklmnsp. Why not,
1559                  * you ask? Well, quite simply because we don't need to. They'll be sent
1560                  * after the FJOIN by FMODE, and FMODE is timestamped, so in the event
1561                  * the losing side sends any modes for the channel which shouldnt win,
1562                  * they wont as their timestamp will be too high :-)
1563                  */
1564
1565                 if (params.size() < 3)
1566                         return true;
1567
1568                 char first[MAXBUF];             /* The first parameter of the mode command */
1569                 char modestring[MAXBUF];        /* The mode sequence (2nd parameter) of the mode command */
1570                 char* mode_users[127];          /* The values used by the mode command */
1571                 memset(&mode_users,0,sizeof(mode_users));       /* Initialize mode parameters */
1572                 mode_users[0] = first;          /* Set this up to be our on-stack value */
1573                 mode_users[1] = modestring;     /* Same here as above */
1574                 strcpy(modestring,"+");         /* Initialize the mode sequence to just '+' */
1575                 unsigned int modectr = 2;       /* Pointer to the third mode parameter (e.g. the one after the +-sequence) */
1576
1577                 userrec* who = NULL;                    /* User we are currently checking */
1578                 std::string channel = params[0];        /* Channel name, as a string */
1579                 time_t TS = atoi(params[1].c_str());    /* Timestamp given to us for remote side */
1580
1581                 /* Try and find the channel */
1582                 chanrec* chan = this->Instance->FindChan(channel);
1583
1584                 /* Initialize channel name in the mode parameters */
1585                 strlcpy(mode_users[0],channel.c_str(),MAXBUF);
1586
1587                 /* default TS is a high value, which if we dont have this
1588                  * channel will let the other side apply their modes.
1589                  */
1590                 time_t ourTS = time(NULL)+600;
1591
1592                 /* Does this channel exist? if it does, get its REAL timestamp */
1593                 if (chan)
1594                         ourTS = chan->age;
1595
1596                 /* In 1.1, if they have the newer channel, we immediately clear
1597                  * all status modes from our users. We then accept their modes.
1598                  * If WE have the newer channel its the other side's job to do this.
1599                  * Note that this causes the losing server to send out confirming
1600                  * FMODE lines.
1601                  */
1602                 if (ourTS > TS)
1603                 {
1604                         std::deque<std::string> param_list;
1605
1606                         if (chan)
1607                                 chan->age = TS;
1608
1609                         /* Lower the TS here */
1610                         if (Utils->AnnounceTSChange && chan)
1611                                 chan->WriteChannelWithServ(Instance->Config->ServerName,
1612                                 "TS for %s changed from %lu to %lu", chan->name, ourTS, TS);
1613                         ourTS = TS;
1614
1615                         param_list.push_back(channel);
1616                         /* Zap all the privilage modes on our side */
1617                         this->RemoveStatus(Instance->Config->ServerName, param_list);
1618                 }
1619
1620                 /* Put the final parameter of the FJOIN into a tokenstream ready to split it */
1621                 irc::tokenstream users(params[2]);
1622                 std::string item = "*";
1623
1624                 /* do this first, so our mode reversals are correctly received by other servers
1625                  * if there is a TS collision.
1626                  */
1627                 params[2] = ":" + params[2];
1628                 Utils->DoOneToAllButSender(source,"FJOIN",params,source);
1629
1630                 /* Now, process every 'prefixes,nick' pair */
1631                 while (item != "")
1632                 {
1633                         /* Find next user */
1634                         item = users.GetToken();
1635
1636                         const char* usr = item.c_str();
1637
1638                         /* Safety check just to make sure someones not sent us an FJOIN full of spaces
1639                          * (is this even possible?) */
1640                         if (usr && *usr)
1641                         {
1642                                 const char* permissions = usr;
1643                                 int ntimes = 0;
1644                                 char* nm = new char[MAXBUF];
1645                                 char* tnm = nm;
1646
1647                                 /* Iterate through all the prefix values, convert them from prefixes
1648                                  * to mode letters, and append them to the mode sequence
1649                                  */
1650                                 while ((*permissions) && (*permissions != ',') && (ntimes < MAXBUF))
1651                                 {
1652                                         ModeHandler* mh = Instance->Modes->FindPrefix(*permissions);
1653                                         if (mh)
1654                                         {
1655                                                 /* This is a valid prefix */
1656                                                 ntimes++;
1657                                                 *tnm++ = mh->GetModeChar();
1658                                         }
1659                                         else
1660                                         {
1661                                                 /* Not a valid prefix...
1662                                                  * danger bill bobbertson! (that's will robinsons older brother ;-) ...)
1663                                                  */
1664                                                 this->Instance->WriteOpers("ERROR: We received a user with an unknown prefix '%c'. Closed connection to avoid a desync.",*permissions);
1665                                                 this->WriteLine(std::string("ERROR :Invalid prefix '")+(*permissions)+"' in FJOIN");
1666                                                 return false;
1667                                         }
1668                                         usr++;
1669                                         permissions++;
1670                                 }
1671
1672                                 /* Null terminate modes */
1673                                 *tnm = 0;
1674                                 /* Advance past the comma, to the nick */
1675                                 usr++;
1676
1677                                 /* Check the user actually exists */
1678                                 who = this->Instance->FindNick(usr);
1679                                 if (who)
1680                                 {
1681                                         /* Did they get any modes? How many times? */
1682                                         strlcat(modestring, nm, MAXBUF);
1683                                         for (int k = 0; k < ntimes; k++)
1684                                                 mode_users[modectr++] = strdup(usr);
1685
1686                                         /* Free temporary buffer used for mode sequence */
1687                                         delete[] nm;
1688
1689                                         /* Check that the user's 'direction' is correct
1690                                          * based on the server sending the FJOIN. We must
1691                                          * check each nickname in turn, because the origin of
1692                                          * the FJOIN may be different to the origin of the nicks
1693                                          * in the command itself.
1694                                          */
1695                                         TreeServer* route_back_again = Utils->BestRouteTo(who->server);
1696                                         if ((!route_back_again) || (route_back_again->GetSocket() != this))
1697                                         {
1698                                                 /* Oh dear oh dear. */
1699                                                 Instance->Log(DEBUG,"Fake direction in FJOIN, user '%s'",who->nick);
1700                                                 continue;
1701                                         }
1702                                         /* Finally, we can actually place the user into the channel.
1703                                          * We're sure its right. Final answer, phone a friend.
1704                                          */
1705                                         chanrec::JoinUser(this->Instance, who, channel.c_str(), true, "");
1706
1707                                         /* Have we already queued up MAXMODES modes with parameters
1708                                          * (+qaohv) ready to be sent to the server?
1709                                          */
1710                                         if (modectr >= (MAXMODES-1))
1711                                         {
1712                                                 /* Only actually give the users any status if we lost
1713                                                  * the FJOIN or drew (equal timestamps).
1714                                                  * It isn't actually possible for ourTS to be > TS here,
1715                                                  * only possible to actually have ourTS == TS, or
1716                                                  * ourTS < TS, because if we lost, we already lowered
1717                                                  * our TS above before we entered this loop. We only
1718                                                  * check >= as a safety measure, in case someone stuffed
1719                                                  * up. If someone DID stuff up, it was most likely me.
1720                                                  * Note: I do not like baseball bats in the face...
1721                                                  */
1722                                                 if (ourTS >= TS)
1723                                                 {
1724                                                         Instance->Log(DEBUG,"Our our channel newer than theirs, accepting their modes");
1725                                                         this->Instance->SendMode((const char**)mode_users,modectr,who);
1726
1727                                                         /* Something stuffed up, and for some reason, the timestamp is
1728                                                          * NOT lowered right now and should be. Lower it. Usually this
1729                                                          * code won't be executed, doubtless someone will remove it some
1730                                                          * day soon.
1731                                                          */
1732                                                         if (ourTS > TS)
1733                                                         {
1734                                                                 Instance->Log(DEFAULT,"Channel TS for %s changed from %lu to %lu",chan->name,ourTS,TS);
1735                                                                 chan->age = TS;
1736                                                                 ourTS = TS;
1737                                                         }
1738                                                 }
1739
1740                                                 /* Reset all this back to defaults, and
1741                                                  * free any ram we have left allocated.
1742                                                  */
1743                                                 strcpy(mode_users[1],"+");
1744                                                 for (unsigned int f = 2; f < modectr; f++)
1745                                                         free(mode_users[f]);
1746                                                 modectr = 2;
1747                                         }
1748                                 }
1749                                 else
1750                                 {
1751                                         /* Remember to free this */
1752                                         delete[] nm;
1753                                         /* If we got here, there's a nick in FJOIN which doesnt exist on this server.
1754                                          * We don't try to process the nickname here (that WOULD cause a segfault because
1755                                          * we'd be playing with null pointers) however, we DO pass the nickname on, just
1756                                          * in case somehow we're desynched, so that other users which might be able to see
1757                                          * the nickname get their fair chance to process it.
1758                                          */
1759                                         Instance->Log(SPARSE,"Warning! Invalid user in FJOIN to channel %s IGNORED", channel.c_str());
1760                                         continue;
1761                                 }
1762                         }
1763                 }
1764
1765                 /* there werent enough modes built up to flush it during FJOIN,
1766                  * or, there are a number left over. flush them out.
1767                  */
1768                 if ((modectr > 2) && (who) && (chan))
1769                 {
1770                         if (ourTS >= TS)
1771                         {
1772                                 /* Our channel is newer than theirs. Evil deeds must be afoot. */
1773                                 this->Instance->SendMode((const char**)mode_users,modectr,who);
1774                                 /* Yet again, we can't actually get a true value here, if everything else
1775                                  * is working as it should.
1776                                  */
1777                                 if (ourTS > TS)
1778                                 {
1779                                         Instance->Log(DEFAULT,"Channel TS for %s changed from %lu to %lu",chan->name,ourTS,TS);
1780                                         chan->age = TS;
1781                                         ourTS = TS;
1782                                 }
1783                         }
1784
1785                         /* Free anything we have left to free */
1786                         for (unsigned int f = 2; f < modectr; f++)
1787                                 free(mode_users[f]);
1788                 }
1789
1790                 /* All done. That wasnt so bad was it, you can wipe
1791                  * the sweat from your forehead now. :-)
1792                  */
1793                 return true;
1794         }
1795
1796         /** NICK command */
1797         bool IntroduceClient(const std::string &source, std::deque<std::string> &params)
1798         {
1799                 if (params.size() < 8)
1800                         return true;
1801                 if (params.size() > 8)
1802                 {
1803                         this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction ("+params[1]+"?)");
1804                         return true;
1805                 }
1806                 // NICK age nick host dhost ident +modes ip :gecos
1807                 //       0    1   2     3     4      5   6     7
1808                 time_t age = atoi(params[0].c_str());
1809
1810                 /* This used to have a pretty craq'y loop doing the same thing,
1811                  * now we just let the STL do the hard work (more efficiently)
1812                  */
1813                 std::string::size_type pos_after_plus = params[5].find_first_not_of('+');
1814                 if (pos_after_plus != std::string::npos)
1815                         params[5] = params[5].substr(pos_after_plus);
1816
1817                 const char* tempnick = params[1].c_str();
1818                 Instance->Log(DEBUG,"Introduce client %s!%s@%s",tempnick,params[4].c_str(),params[2].c_str());
1819
1820                 user_hash::iterator iter = this->Instance->clientlist.find(tempnick);
1821
1822                 if (iter != this->Instance->clientlist.end())
1823                 {
1824                         // nick collision
1825                         Instance->Log(DEBUG,"Nick collision on %s!%s@%s: %lu %lu",tempnick,params[4].c_str(),params[2].c_str(),(unsigned long)age,(unsigned long)iter->second->age);
1826                         this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+tempnick+" :Nickname collision");
1827                         userrec::QuitUser(this->Instance, iter->second, "Nickname collision");
1828                         return true;
1829                 }
1830
1831                 userrec* _new = new userrec(this->Instance);
1832                 this->Instance->clientlist[tempnick] = _new;
1833                 _new->SetFd(FD_MAGIC_NUMBER);
1834                 strlcpy(_new->nick, tempnick,NICKMAX-1);
1835                 strlcpy(_new->host, params[2].c_str(),63);
1836                 strlcpy(_new->dhost, params[3].c_str(),63);
1837                 _new->server = this->Instance->FindServerNamePtr(source.c_str());
1838                 strlcpy(_new->ident, params[4].c_str(),IDENTMAX);
1839                 strlcpy(_new->fullname, params[7].c_str(),MAXGECOS);
1840                 _new->registered = REG_ALL;
1841                 _new->signon = age;
1842
1843                 for (std::string::iterator v = params[5].begin(); v != params[5].end(); v++)
1844                         _new->modes[(*v)-65] = 1;
1845
1846 #ifdef SUPPORT_IP6LINKS
1847                 if (params[6].find_first_of(":") != std::string::npos)
1848                         _new->SetSockAddr(AF_INET6, params[6].c_str(), 0);
1849                 else
1850 #endif
1851                         _new->SetSockAddr(AF_INET, params[6].c_str(), 0);
1852
1853                 this->Instance->SNO->WriteToSnoMask('C',"Client connecting at %s: %s!%s@%s [%s]",_new->server,_new->nick,_new->ident,_new->host, _new->GetIPString());
1854
1855                 params[7] = ":" + params[7];
1856                 Utils->DoOneToAllButSender(source,"NICK",params,source);
1857
1858                 // Increment the Source Servers User Count..
1859                 TreeServer* SourceServer = Utils->FindServer(source);
1860                 if (SourceServer)
1861                 {
1862                         Instance->Log(DEBUG,"Found source server of %s",_new->nick);
1863                         SourceServer->AddUserCount();
1864                 }
1865
1866                 FOREACH_MOD_I(Instance,I_OnPostConnect,OnPostConnect(_new));
1867
1868                 return true;
1869         }
1870
1871         /** Send one or more FJOINs for a channel of users.
1872          * If the length of a single line is more than 480-NICKMAX
1873          * in length, it is split over multiple lines.
1874          */
1875         void SendFJoins(TreeServer* Current, chanrec* c)
1876         {
1877                 Instance->Log(DEBUG,"Sending FJOINs to other server for %s",c->name);
1878                 char list[MAXBUF];
1879                 std::string individual_halfops = std::string(":")+this->Instance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age);
1880
1881                 size_t dlen, curlen;
1882                 dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
1883                 int numusers = 0;
1884                 char* ptr = list + dlen;
1885
1886                 CUList *ulist = c->GetUsers();
1887                 std::string modes = "";
1888                 std::string params = "";
1889
1890                 for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
1891                 {
1892                         // The first parameter gets a : before it
1893                         size_t ptrlen = snprintf(ptr, MAXBUF, " %s%s,%s", !numusers ? ":" : "", c->GetAllPrefixChars(i->second), i->second->nick);
1894
1895                         curlen += ptrlen;
1896                         ptr += ptrlen;
1897
1898                         numusers++;
1899
1900                         if (curlen > (480-NICKMAX))
1901                         {
1902                                 this->WriteLine(list);
1903                                 dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
1904                                 ptr = list + dlen;
1905                                 ptrlen = 0;
1906                                 numusers = 0;
1907                         }
1908                 }
1909
1910                 if (numusers)
1911                         this->WriteLine(list);
1912
1913                 for (BanList::iterator b = c->bans.begin(); b != c->bans.end(); b++)
1914                 {
1915                         modes.append("b");
1916                         params.append(b->data).append(" ");
1917                 }
1918                 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age)+" +"+c->ChanModes(true)+modes+" "+params);
1919         }
1920
1921         /** Send G, Q, Z and E lines */
1922         void SendXLines(TreeServer* Current)
1923         {
1924                 char data[MAXBUF];
1925                 std::string n = this->Instance->Config->ServerName;
1926                 const char* sn = n.c_str();
1927                 int iterations = 0;
1928                 /* Yes, these arent too nice looking, but they get the job done */
1929                 for (std::vector<ZLine*>::iterator i = Instance->XLines->zlines.begin(); i != Instance->XLines->zlines.end(); i++, iterations++)
1930                 {
1931                         snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1932                         this->WriteLine(data);
1933                 }
1934                 for (std::vector<QLine*>::iterator i = Instance->XLines->qlines.begin(); i != Instance->XLines->qlines.end(); i++, iterations++)
1935                 {
1936                         snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1937                         this->WriteLine(data);
1938                 }
1939                 for (std::vector<GLine*>::iterator i = Instance->XLines->glines.begin(); i != Instance->XLines->glines.end(); i++, iterations++)
1940                 {
1941                         snprintf(data,MAXBUF,":%s ADDLINE G %s %s %lu %lu :%s",sn,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1942                         this->WriteLine(data);
1943                 }
1944                 for (std::vector<ELine*>::iterator i = Instance->XLines->elines.begin(); i != Instance->XLines->elines.end(); i++, iterations++)
1945                 {
1946                         snprintf(data,MAXBUF,":%s ADDLINE E %s %s %lu %lu :%s",sn,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1947                         this->WriteLine(data);
1948                 }
1949                 for (std::vector<ZLine*>::iterator i = Instance->XLines->pzlines.begin(); i != Instance->XLines->pzlines.end(); i++, iterations++)
1950                 {
1951                         snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1952                         this->WriteLine(data);
1953                 }
1954                 for (std::vector<QLine*>::iterator i = Instance->XLines->pqlines.begin(); i != Instance->XLines->pqlines.end(); i++, iterations++)
1955                 {
1956                         snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1957                         this->WriteLine(data);
1958                 }
1959                 for (std::vector<GLine*>::iterator i = Instance->XLines->pglines.begin(); i != Instance->XLines->pglines.end(); i++, iterations++)
1960                 {
1961                         snprintf(data,MAXBUF,":%s ADDLINE G %s %s %lu %lu :%s",sn,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1962                         this->WriteLine(data);
1963                 }
1964                 for (std::vector<ELine*>::iterator i = Instance->XLines->pelines.begin(); i != Instance->XLines->pelines.end(); i++, iterations++)
1965                 {
1966                         snprintf(data,MAXBUF,":%s ADDLINE E %s %s %lu %lu :%s",sn,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1967                         this->WriteLine(data);
1968                 }
1969         }
1970
1971         /** Send channel modes and topics */
1972         void SendChannelModes(TreeServer* Current)
1973         {
1974                 char data[MAXBUF];
1975                 std::deque<std::string> list;
1976                 int iterations = 0;
1977                 std::string n = this->Instance->Config->ServerName;
1978                 const char* sn = n.c_str();
1979                 for (chan_hash::iterator c = this->Instance->chanlist.begin(); c != this->Instance->chanlist.end(); c++, iterations++)
1980                 {
1981                         SendFJoins(Current, c->second);
1982                         if (*c->second->topic)
1983                         {
1984                                 snprintf(data,MAXBUF,":%s FTOPIC %s %lu %s :%s",sn,c->second->name,(unsigned long)c->second->topicset,c->second->setby,c->second->topic);
1985                                 this->WriteLine(data);
1986                         }
1987                         FOREACH_MOD_I(this->Instance,I_OnSyncChannel,OnSyncChannel(c->second,(Module*)Utils->Creator,(void*)this));
1988                         list.clear();
1989                         c->second->GetExtList(list);
1990                         for (unsigned int j = 0; j < list.size(); j++)
1991                         {
1992                                 FOREACH_MOD_I(this->Instance,I_OnSyncChannelMetaData,OnSyncChannelMetaData(c->second,(Module*)Utils->Creator,(void*)this,list[j]));
1993                         }
1994                 }
1995         }
1996
1997         /** send all users and their oper state/modes */
1998         void SendUsers(TreeServer* Current)
1999         {
2000                 char data[MAXBUF];
2001                 std::deque<std::string> list;
2002                 int iterations = 0;
2003                 for (user_hash::iterator u = this->Instance->clientlist.begin(); u != this->Instance->clientlist.end(); u++, iterations++)
2004                 {
2005                         if (u->second->registered == REG_ALL)
2006                         {
2007                                 snprintf(data,MAXBUF,":%s NICK %lu %s %s %s %s +%s %s :%s",u->second->server,(unsigned long)u->second->age,u->second->nick,u->second->host,u->second->dhost,u->second->ident,u->second->FormatModes(),u->second->GetIPString(),u->second->fullname);
2008                                 this->WriteLine(data);
2009                                 if (*u->second->oper)
2010                                 {
2011                                         this->WriteLine(":"+std::string(u->second->nick)+" OPERTYPE "+std::string(u->second->oper));
2012                                 }
2013                                 if (*u->second->awaymsg)
2014                                 {
2015                                         this->WriteLine(":"+std::string(u->second->nick)+" AWAY :"+std::string(u->second->awaymsg));
2016                                 }
2017                                 FOREACH_MOD_I(this->Instance,I_OnSyncUser,OnSyncUser(u->second,(Module*)Utils->Creator,(void*)this));
2018                                 list.clear();
2019                                 u->second->GetExtList(list);
2020                                 for (unsigned int j = 0; j < list.size(); j++)
2021                                 {
2022                                         FOREACH_MOD_I(this->Instance,I_OnSyncUserMetaData,OnSyncUserMetaData(u->second,(Module*)Utils->Creator,(void*)this,list[j]));
2023                                 }
2024                         }
2025                 }
2026         }
2027
2028         /** This function is called when we want to send a netburst to a local
2029          * server. There is a set order we must do this, because for example
2030          * users require their servers to exist, and channels require their
2031          * users to exist. You get the idea.
2032          */
2033         void DoBurst(TreeServer* s)
2034         {
2035                 std::string burst = "BURST "+ConvToStr(time(NULL));
2036                 std::string endburst = "ENDBURST";
2037                 // Because by the end of the netburst, it  could be gone!
2038                 std::string name = s->GetName();
2039                 this->Instance->SNO->WriteToSnoMask('l',"Bursting to \2"+name+"\2.");
2040                 this->WriteLine(burst);
2041                 /* send our version string */
2042                 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" VERSION :"+this->Instance->GetVersionString());
2043                 /* Send server tree */
2044                 this->SendServers(Utils->TreeRoot,s,1);
2045                 /* Send users and their oper status */
2046                 this->SendUsers(s);
2047                 /* Send everything else (channel modes, xlines etc) */
2048                 this->SendChannelModes(s);
2049                 this->SendXLines(s);
2050                 FOREACH_MOD_I(this->Instance,I_OnSyncOtherMetaData,OnSyncOtherMetaData((Module*)Utils->Creator,(void*)this));
2051                 this->WriteLine(endburst);
2052                 this->Instance->SNO->WriteToSnoMask('l',"Finished bursting to \2"+name+"\2.");
2053         }
2054
2055         /** This function is called when we receive data from a remote
2056          * server. We buffer the data in a std::string (it doesnt stay
2057          * there for long), reading using InspSocket::Read() which can
2058          * read up to 16 kilobytes in one operation.
2059          *
2060          * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
2061          * THE SOCKET OBJECT FOR US.
2062          */
2063         virtual bool OnDataReady()
2064         {
2065                 char* data = this->Read();
2066                 /* Check that the data read is a valid pointer and it has some content */
2067                 if (data && *data)
2068                 {
2069                         this->in_buffer.append(data);
2070                         /* While there is at least one new line in the buffer,
2071                          * do something useful (we hope!) with it.
2072                          */
2073                         while (in_buffer.find("\n") != std::string::npos)
2074                         {
2075                                 std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
2076                                 in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
2077                                 /* Use rfind here not find, as theres more
2078                                  * chance of the \r being near the end of the
2079                                  * string, not the start.
2080                                  */
2081                                 if (ret.find("\r") != std::string::npos)
2082                                         ret = in_buffer.substr(0,in_buffer.find("\r")-1);
2083                                 /* Process this one, abort if it
2084                                  * didnt return true.
2085                                  */
2086                                 if (this->ctx_in)
2087                                 {
2088                                         char out[1024];
2089                                         char result[1024];
2090                                         memset(result,0,1024);
2091                                         memset(out,0,1024);
2092                                         /* ERROR + CAPAB is still allowed unencryped */
2093                                         if ((ret.substr(0,7) != "ERROR :") && (ret.substr(0,6) != "CAPAB "))
2094                                         {
2095                                                 int nbytes = from64tobits(out, ret.c_str(), 1024);
2096                                                 if ((nbytes > 0) && (nbytes < 1024))
2097                                                 {
2098                                                         ctx_in->Decrypt(out, result, nbytes, 0);
2099                                                         for (int t = 0; t < nbytes; t++)
2100                                                         {
2101                                                                 if (result[t] == '\7')
2102                                                                 {
2103                                                                         /* We only need to stick a \0 on the
2104                                                                          * first \7, the rest will be lost
2105                                                                          */
2106                                                                         result[t] = 0;
2107                                                                         break;
2108                                                                 }
2109                                                         }
2110                                                         ret = result;
2111                                                 }
2112                                         }
2113                                 }
2114                                 if (!this->ProcessLine(ret))
2115                                 {
2116                                         return false;
2117                                 }
2118                         }
2119                         return true;
2120                 }
2121                 /* EAGAIN returns an empty but non-NULL string, so this
2122                  * evaluates to TRUE for EAGAIN but to FALSE for EOF.
2123                  */
2124                 return (data && !*data);
2125         }
2126
2127         int WriteLine(std::string line)
2128         {
2129                 Instance->Log(DEBUG,"OUT: %s",line.c_str());
2130                 if (this->ctx_out)
2131                 {
2132                         char result[10240];
2133                         char result64[10240];
2134                         if (this->keylength)
2135                         {
2136                                 // pad it to the key length
2137                                 int n = this->keylength - (line.length() % this->keylength);
2138                                 if (n)
2139                                         line.append(n,'\7');
2140                         }
2141                         unsigned int ll = line.length();
2142                         ctx_out->Encrypt(line.c_str(), result, ll, 0);
2143                         to64frombits((unsigned char*)result64,(unsigned char*)result,ll);
2144                         line = result64;
2145                 }
2146                 line.append("\r\n");
2147                 return this->Write(line);
2148         }
2149
2150         /* Handle ERROR command */
2151         bool Error(std::deque<std::string> &params)
2152         {
2153                 if (params.size() < 1)
2154                         return false;
2155                 this->Instance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(InboundServerName != "" ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
2156                 /* we will return false to cause the socket to close. */
2157                 return false;
2158         }
2159
2160         /** remote MOTD. leet, huh? */
2161         bool Motd(const std::string &prefix, std::deque<std::string> &params)
2162         {
2163                 if (params.size() > 0)
2164                 {
2165                         if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
2166                         {
2167                                 /* It's for our server */
2168                                 string_list results;
2169                                 userrec* source = this->Instance->FindNick(prefix);
2170
2171                                 if (source)
2172                                 {
2173                                         std::deque<std::string> par;
2174                                         par.push_back(prefix);
2175                                         par.push_back("");
2176
2177                                         if (!Instance->Config->MOTD.size())
2178                                         {
2179                                                 par[1] = std::string("::")+Instance->Config->ServerName+" 422 "+source->nick+" :Message of the day file is missing.";
2180                                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2181                                                 return true;
2182                                         }
2183
2184                                         par[1] = std::string("::")+Instance->Config->ServerName+" 375 "+source->nick+" :"+Instance->Config->ServerName+" message of the day";
2185                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2186
2187                                         for (unsigned int i = 0; i < Instance->Config->MOTD.size(); i++)
2188                                         {
2189                                                 par[1] = std::string("::")+Instance->Config->ServerName+" 372 "+source->nick+" :- "+Instance->Config->MOTD[i];
2190                                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2191                                         }
2192
2193                                         par[1] = std::string("::")+Instance->Config->ServerName+" 376 "+source->nick+" End of message of the day.";
2194                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2195                                 }
2196                         }
2197                         else
2198                         {
2199                                 /* Pass it on */
2200                                 userrec* source = this->Instance->FindNick(prefix);
2201                                 if (source)
2202                                         Utils->DoOneToOne(prefix, "MOTD", params, params[0]);
2203                         }
2204                 }
2205                 return true;
2206         }
2207
2208         /** remote ADMIN. leet, huh? */
2209         bool Admin(const std::string &prefix, std::deque<std::string> &params)
2210         {
2211                 if (params.size() > 0)
2212                 {
2213                         if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
2214                         {
2215                                 /* It's for our server */
2216                                 string_list results;
2217                                 userrec* source = this->Instance->FindNick(prefix);
2218
2219                                 if (source)
2220                                 {
2221                                         std::deque<std::string> par;
2222                                         par.push_back(prefix);
2223                                         par.push_back("");
2224
2225                                         par[1] = std::string("::")+Instance->Config->ServerName+" 256 "+source->nick+" :Administrative info for "+Instance->Config->ServerName;
2226                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2227
2228                                         par[1] = std::string("::")+Instance->Config->ServerName+" 257 "+source->nick+" :Name     - "+Instance->Config->AdminName;
2229                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2230
2231                                         par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :Nickname - "+Instance->Config->AdminNick;
2232                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2233
2234                                         par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :E-Mail   - "+Instance->Config->AdminEmail;
2235                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2236                                 }
2237                         }
2238                         else
2239                         {
2240                                 /* Pass it on */
2241                                 userrec* source = this->Instance->FindNick(prefix);
2242                                 if (source)
2243                                         Utils->DoOneToOne(prefix, "ADMIN", params, params[0]);
2244                         }
2245                 }
2246                 return true;
2247         }
2248
2249         bool Stats(const std::string &prefix, std::deque<std::string> &params)
2250         {
2251                 /* Get the reply to a STATS query if it matches this servername,
2252                  * and send it back as a load of PUSH queries
2253                  */
2254                 if (params.size() > 1)
2255                 {
2256                         if (this->Instance->MatchText(this->Instance->Config->ServerName, params[1]))
2257                         {
2258                                 /* It's for our server */
2259                                 string_list results;
2260                                 userrec* source = this->Instance->FindNick(prefix);
2261                                 if (source)
2262                                 {
2263                                         std::deque<std::string> par;
2264                                         par.push_back(prefix);
2265                                         par.push_back("");
2266                                         DoStats(this->Instance, *(params[0].c_str()), source, results);
2267                                         for (size_t i = 0; i < results.size(); i++)
2268                                         {
2269                                                 par[1] = "::" + results[i];
2270                                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
2271                                         }
2272                                 }
2273                         }
2274                         else
2275                         {
2276                                 /* Pass it on */
2277                                 userrec* source = this->Instance->FindNick(prefix);
2278                                 if (source)
2279                                         Utils->DoOneToOne(prefix, "STATS", params, params[1]);
2280                         }
2281                 }
2282                 return true;
2283         }
2284
2285
2286         /** Because the core won't let users or even SERVERS set +o,
2287          * we use the OPERTYPE command to do this.
2288          */
2289         bool OperType(const std::string &prefix, std::deque<std::string> &params)
2290         {
2291                 if (params.size() != 1)
2292                 {
2293                         Instance->Log(DEBUG,"Received invalid oper type from %s",prefix.c_str());
2294                         return true;
2295                 }
2296                 std::string opertype = params[0];
2297                 userrec* u = this->Instance->FindNick(prefix);
2298                 if (u)
2299                 {
2300                         u->modes[UM_OPERATOR] = 1;
2301                         strlcpy(u->oper,opertype.c_str(),NICKMAX-1);
2302                         Utils->DoOneToAllButSender(u->nick,"OPERTYPE",params,u->server);
2303                 }
2304                 return true;
2305         }
2306
2307         /** Because Andy insists that services-compatible servers must
2308          * implement SVSNICK and SVSJOIN, that's exactly what we do :p
2309          */
2310         bool ForceNick(const std::string &prefix, std::deque<std::string> &params)
2311         {
2312                 if (params.size() < 3)
2313                         return true;
2314
2315                 userrec* u = this->Instance->FindNick(params[0]);
2316
2317                 if (u)
2318                 {
2319                         Utils->DoOneToAllButSender(prefix,"SVSNICK",params,prefix);
2320                         if (IS_LOCAL(u))
2321                         {
2322                                 std::deque<std::string> par;
2323                                 par.push_back(params[1]);
2324                                 /* This is not required as one is sent in OnUserPostNick below
2325                                  */
2326                                 //Utils->DoOneToMany(u->nick,"NICK",par);
2327                                 if (!u->ForceNickChange(params[1].c_str()))
2328                                 {
2329                                         userrec::QuitUser(this->Instance, u, "Nickname collision");
2330                                         return true;
2331                                 }
2332                                 u->age = atoi(params[2].c_str());
2333                         }
2334                 }
2335                 return true;
2336         }
2337
2338         bool ServiceJoin(const std::string &prefix, std::deque<std::string> &params)
2339         {
2340                 if (params.size() < 2)
2341                         return true;
2342
2343                 userrec* u = this->Instance->FindNick(params[0]);
2344
2345                 if (u)
2346                 {
2347                         chanrec::JoinUser(this->Instance, u, params[1].c_str(), false);
2348                         Utils->DoOneToAllButSender(prefix,"SVSJOIN",params,prefix);
2349                 }
2350                 return true;
2351         }
2352
2353         bool RemoteRehash(const std::string &prefix, std::deque<std::string> &params)
2354         {
2355                 if (params.size() < 1)
2356                         return false;
2357
2358                 std::string servermask = params[0];
2359
2360                 if (this->Instance->MatchText(this->Instance->Config->ServerName,servermask))
2361                 {
2362                         this->Instance->SNO->WriteToSnoMask('l',"Remote rehash initiated from server \002"+prefix+"\002.");
2363                         this->Instance->RehashServer();
2364                         Utils->ReadConfiguration(false);
2365                         InitializeDisabledCommands(Instance->Config->DisabledCommands, Instance);
2366                 }
2367                 Utils->DoOneToAllButSender(prefix,"REHASH",params,prefix);
2368                 return true;
2369         }
2370
2371         bool RemoteKill(const std::string &prefix, std::deque<std::string> &params)
2372         {
2373                 if (params.size() != 2)
2374                         return true;
2375
2376                 std::string nick = params[0];
2377                 userrec* u = this->Instance->FindNick(prefix);
2378                 userrec* who = this->Instance->FindNick(nick);
2379
2380                 if (who)
2381                 {
2382                         /* Prepend kill source, if we don't have one */
2383                         std::string sourceserv = prefix;
2384                         if (u)
2385                         {
2386                                 sourceserv = u->server;
2387                         }
2388                         if (*(params[1].c_str()) != '[')
2389                         {
2390                                 params[1] = "[" + sourceserv + "] Killed (" + params[1] +")";
2391                         }
2392                         std::string reason = params[1];
2393                         params[1] = ":" + params[1];
2394                         Utils->DoOneToAllButSender(prefix,"KILL",params,sourceserv);
2395                         who->Write(":%s KILL %s :%s (%s)", sourceserv.c_str(), who->nick, sourceserv.c_str(), reason.c_str());
2396                         userrec::QuitUser(this->Instance,who,reason);
2397                 }
2398                 return true;
2399         }
2400
2401         bool LocalPong(const std::string &prefix, std::deque<std::string> &params)
2402         {
2403                 if (params.size() < 1)
2404                         return true;
2405
2406                 if (params.size() == 1)
2407                 {
2408                         TreeServer* ServerSource = Utils->FindServer(prefix);
2409                         if (ServerSource)
2410                         {
2411                                 ServerSource->SetPingFlag();
2412                         }
2413                 }
2414                 else
2415                 {
2416                         std::string forwardto = params[1];
2417                         if (forwardto == this->Instance->Config->ServerName)
2418                         {
2419                                 /*
2420                                  * this is a PONG for us
2421                                  * if the prefix is a user, check theyre local, and if they are,
2422                                  * dump the PONG reply back to their fd. If its a server, do nowt.
2423                                  * Services might want to send these s->s, but we dont need to yet.
2424                                  */
2425                                 userrec* u = this->Instance->FindNick(prefix);
2426
2427                                 if (u)
2428                                 {
2429                                         u->WriteServ("PONG %s %s",params[0].c_str(),params[1].c_str());
2430                                 }
2431                         }
2432                         else
2433                         {
2434                                 // not for us, pass it on :)
2435                                 Utils->DoOneToOne(prefix,"PONG",params,forwardto);
2436                         }
2437                 }
2438
2439                 return true;
2440         }
2441
2442         bool MetaData(const std::string &prefix, std::deque<std::string> &params)
2443         {
2444                 if (params.size() < 3)
2445                         return true;
2446
2447                 TreeServer* ServerSource = Utils->FindServer(prefix);
2448
2449                 if (ServerSource)
2450                 {
2451                         if (params[0] == "*")
2452                         {
2453                                 FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_OTHER,NULL,params[1],params[2]));
2454                         }
2455                         else if (*(params[0].c_str()) == '#')
2456                         {
2457                                 chanrec* c = this->Instance->FindChan(params[0]);
2458                                 if (c)
2459                                 {
2460                                         FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_CHANNEL,c,params[1],params[2]));
2461                                 }
2462                         }
2463                         else if (*(params[0].c_str()) != '#')
2464                         {
2465                                 userrec* u = this->Instance->FindNick(params[0]);
2466                                 if (u)
2467                                 {
2468                                         FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_USER,u,params[1],params[2]));
2469                                 }
2470                         }
2471                 }
2472
2473                 params[2] = ":" + params[2];
2474                 Utils->DoOneToAllButSender(prefix,"METADATA",params,prefix);
2475                 return true;
2476         }
2477
2478         bool ServerVersion(const std::string &prefix, std::deque<std::string> &params)
2479         {
2480                 if (params.size() < 1)
2481                         return true;
2482
2483                 TreeServer* ServerSource = Utils->FindServer(prefix);
2484
2485                 if (ServerSource)
2486                 {
2487                         ServerSource->SetVersion(params[0]);
2488                 }
2489                 params[0] = ":" + params[0];
2490                 Utils->DoOneToAllButSender(prefix,"VERSION",params,prefix);
2491                 return true;
2492         }
2493
2494         bool ChangeHost(const std::string &prefix, std::deque<std::string> &params)
2495         {
2496                 if (params.size() < 1)
2497                         return true;
2498
2499                 userrec* u = this->Instance->FindNick(prefix);
2500
2501                 if (u)
2502                 {
2503                         u->ChangeDisplayedHost(params[0].c_str());
2504                         Utils->DoOneToAllButSender(prefix,"FHOST",params,u->server);
2505                 }
2506                 return true;
2507         }
2508
2509         bool AddLine(const std::string &prefix, std::deque<std::string> &params)
2510         {
2511                 if (params.size() < 6)
2512                         return true;
2513
2514                 bool propogate = false;
2515
2516                 switch (*(params[0].c_str()))
2517                 {
2518                         case 'Z':
2519                                 propogate = Instance->XLines->add_zline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
2520                                 Instance->XLines->zline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
2521                         break;
2522                         case 'Q':
2523                                 propogate = Instance->XLines->add_qline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
2524                                 Instance->XLines->qline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
2525                         break;
2526                         case 'E':
2527                                 propogate = Instance->XLines->add_eline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
2528                                 Instance->XLines->eline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
2529                         break;
2530                         case 'G':
2531                                 propogate = Instance->XLines->add_gline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
2532                                 Instance->XLines->gline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
2533                         break;
2534                         case 'K':
2535                                 propogate = Instance->XLines->add_kline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
2536                         break;
2537                         default:
2538                                 /* Just in case... */
2539                                 this->Instance->SNO->WriteToSnoMask('x',"\2WARNING\2: Invalid xline type '"+params[0]+"' sent by server "+prefix+", ignored!");
2540                                 propogate = false;
2541                         break;
2542                 }
2543
2544                 /* Send it on its way */
2545                 if (propogate)
2546                 {
2547                         if (atoi(params[4].c_str()))
2548                         {
2549                                 this->Instance->SNO->WriteToSnoMask('x',"%s Added %cLINE on %s to expire in %lu seconds (%s).",prefix.c_str(),*(params[0].c_str()),params[1].c_str(),atoi(params[4].c_str()),params[5].c_str());
2550                         }
2551                         else
2552                         {
2553                                 this->Instance->SNO->WriteToSnoMask('x',"%s Added permenant %cLINE on %s (%s).",prefix.c_str(),*(params[0].c_str()),params[1].c_str(),params[5].c_str());
2554                         }
2555                         params[5] = ":" + params[5];
2556                         Utils->DoOneToAllButSender(prefix,"ADDLINE",params,prefix);
2557                 }
2558                 if (!this->bursting)
2559                 {
2560                         Instance->Log(DEBUG,"Applying lines...");
2561                         Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
2562                 }
2563                 return true;
2564         }
2565
2566         bool ChangeName(const std::string &prefix, std::deque<std::string> &params)
2567         {
2568                 if (params.size() < 1)
2569                         return true;
2570
2571                 userrec* u = this->Instance->FindNick(prefix);
2572
2573                 if (u)
2574                 {
2575                         u->ChangeName(params[0].c_str());
2576                         params[0] = ":" + params[0];
2577                         Utils->DoOneToAllButSender(prefix,"FNAME",params,u->server);
2578                 }
2579                 return true;
2580         }
2581
2582         bool Whois(const std::string &prefix, std::deque<std::string> &params)
2583         {
2584                 if (params.size() < 1)
2585                         return true;
2586
2587                 Instance->Log(DEBUG,"In IDLE command");
2588                 userrec* u = this->Instance->FindNick(prefix);
2589
2590                 if (u)
2591                 {
2592                         Instance->Log(DEBUG,"USER EXISTS: %s",u->nick);
2593                         // an incoming request
2594                         if (params.size() == 1)
2595                         {
2596                                 userrec* x = this->Instance->FindNick(params[0]);
2597                                 if ((x) && (IS_LOCAL(x)))
2598                                 {
2599                                         userrec* x = this->Instance->FindNick(params[0]);
2600                                         char signon[MAXBUF];
2601                                         char idle[MAXBUF];
2602
2603                                         snprintf(signon,MAXBUF,"%lu",(unsigned long)x->signon);
2604                                         snprintf(idle,MAXBUF,"%lu",(unsigned long)abs((x->idle_lastmsg)-time(NULL)));
2605                                         std::deque<std::string> par;
2606                                         par.push_back(prefix);
2607                                         par.push_back(signon);
2608                                         par.push_back(idle);
2609                                         // ours, we're done, pass it BACK
2610                                         Utils->DoOneToOne(params[0],"IDLE",par,u->server);
2611                                 }
2612                                 else
2613                                 {
2614                                         // not ours pass it on
2615                                         Utils->DoOneToOne(prefix,"IDLE",params,x->server);
2616                                 }
2617                         }
2618                         else if (params.size() == 3)
2619                         {
2620                                 std::string who_did_the_whois = params[0];
2621                                 userrec* who_to_send_to = this->Instance->FindNick(who_did_the_whois);
2622                                 if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
2623                                 {
2624                                         // an incoming reply to a whois we sent out
2625                                         std::string nick_whoised = prefix;
2626                                         unsigned long signon = atoi(params[1].c_str());
2627                                         unsigned long idle = atoi(params[2].c_str());
2628                                         if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
2629                                                 do_whois(this->Instance,who_to_send_to,u,signon,idle,nick_whoised.c_str());
2630                                 }
2631                                 else
2632                                 {
2633                                         // not ours, pass it on
2634                                         Utils->DoOneToOne(prefix,"IDLE",params,who_to_send_to->server);
2635                                 }
2636                         }
2637                 }
2638                 return true;
2639         }
2640
2641         bool Push(const std::string &prefix, std::deque<std::string> &params)
2642         {
2643                 if (params.size() < 2)
2644                         return true;
2645
2646                 userrec* u = this->Instance->FindNick(params[0]);
2647
2648                 if (!u)
2649                         return true;
2650
2651                 if (IS_LOCAL(u))
2652                 {
2653                         u->Write(params[1]);
2654                 }
2655                 else
2656                 {
2657                         // continue the raw onwards
2658                         params[1] = ":" + params[1];
2659                         Utils->DoOneToOne(prefix,"PUSH",params,u->server);
2660                 }
2661                 return true;
2662         }
2663
2664         bool Time(const std::string &prefix, std::deque<std::string> &params)
2665         {
2666                 // :source.server TIME remote.server sendernick
2667                 // :remote.server TIME source.server sendernick TS
2668                 if (params.size() == 2)
2669                 {
2670                         // someone querying our time?
2671                         if (this->Instance->Config->ServerName == params[0])
2672                         {
2673                                 userrec* u = this->Instance->FindNick(params[1]);
2674                                 if (u)
2675                                 {
2676                                         char curtime[256];
2677                                         snprintf(curtime,256,"%lu",(unsigned long)time(NULL));
2678                                         params.push_back(curtime);
2679                                         params[0] = prefix;
2680                                         Utils->DoOneToOne(this->Instance->Config->ServerName,"TIME",params,params[0]);
2681                                 }
2682                         }
2683                         else
2684                         {
2685                                 // not us, pass it on
2686                                 userrec* u = this->Instance->FindNick(params[1]);
2687                                 if (u)
2688                                         Utils->DoOneToOne(prefix,"TIME",params,params[0]);
2689                         }
2690                 }
2691                 else if (params.size() == 3)
2692                 {
2693                         // a response to a previous TIME
2694                         userrec* u = this->Instance->FindNick(params[1]);
2695                         if ((u) && (IS_LOCAL(u)))
2696                         {
2697                         time_t rawtime = atol(params[2].c_str());
2698                         struct tm * timeinfo;
2699                         timeinfo = localtime(&rawtime);
2700                                 char tms[26];
2701                                 snprintf(tms,26,"%s",asctime(timeinfo));
2702                                 tms[24] = 0;
2703                         u->WriteServ("391 %s %s :%s",u->nick,prefix.c_str(),tms);
2704                         }
2705                         else
2706                         {
2707                                 if (u)
2708                                         Utils->DoOneToOne(prefix,"TIME",params,u->server);
2709                         }
2710                 }
2711                 return true;
2712         }
2713
2714         bool LocalPing(const std::string &prefix, std::deque<std::string> &params)
2715         {
2716                 if (params.size() < 1)
2717                         return true;
2718
2719                 if (params.size() == 1)
2720                 {
2721                         std::string stufftobounce = params[0];
2722                         this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" PONG "+stufftobounce);
2723                         return true;
2724                 }
2725                 else
2726                 {
2727                         std::string forwardto = params[1];
2728                         if (forwardto == this->Instance->Config->ServerName)
2729                         {
2730                                 // this is a ping for us, send back PONG to the requesting server
2731                                 params[1] = params[0];
2732                                 params[0] = forwardto;
2733                                 Utils->DoOneToOne(forwardto,"PONG",params,params[1]);
2734                         }
2735                         else
2736                         {
2737                                 // not for us, pass it on :)
2738                                 Utils->DoOneToOne(prefix,"PING",params,forwardto);
2739                         }
2740                         return true;
2741                 }
2742         }
2743
2744         bool RemoveStatus(const std::string &prefix, std::deque<std::string> &params)
2745         {
2746                 if (params.size() < 1)
2747                         return true;
2748
2749                 chanrec* c = Instance->FindChan(params[0]);
2750
2751                 if (c)
2752                 {
2753                         irc::modestacker modestack(false);
2754                         CUList *ulist = c->GetUsers();
2755                         const char* y[127];
2756                         std::deque<std::string> stackresult;
2757                         std::string x;
2758
2759                         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
2760                         {
2761                                 std::string modesequence = Instance->Modes->ModeString(i->second, c);
2762                                 if (modesequence.length())
2763                                 {
2764                                         Instance->Log(DEBUG,"Mode sequence = '%s'",modesequence.c_str());
2765                                         irc::spacesepstream sep(modesequence);
2766                                         std::string modeletters = sep.GetToken();
2767                                         Instance->Log(DEBUG,"Mode letters = '%s'",modeletters.c_str());
2768
2769                                         while (!modeletters.empty())
2770                                         {
2771                                                 char mletter = *(modeletters.begin());
2772                                                 modestack.Push(mletter,sep.GetToken());
2773                                                 Instance->Log(DEBUG,"Push letter = '%c'",mletter);
2774                                                 modeletters.erase(modeletters.begin());
2775                                                 Instance->Log(DEBUG,"Mode letters = '%s'",modeletters.c_str());
2776                                         }
2777                                 }
2778                         }
2779
2780                         while (modestack.GetStackedLine(stackresult))
2781                         {
2782                                 Instance->Log(DEBUG,"Stacked line size %d",stackresult.size());
2783                                 stackresult.push_front(ConvToStr(c->age));
2784                                 stackresult.push_front(c->name);
2785                                 Utils->DoOneToMany(Instance->Config->ServerName, "FMODE", stackresult);
2786                                 stackresult.erase(stackresult.begin() + 1);
2787                                 Instance->Log(DEBUG,"Stacked items:");
2788                                 for (size_t z = 0; z < stackresult.size(); z++)
2789                                 {
2790                                         y[z] = stackresult[z].c_str();
2791                                         Instance->Log(DEBUG,"\tstackresult[%d]='%s'",z,stackresult[z].c_str());
2792                                 }
2793                                 userrec* n = new userrec(Instance);
2794                                 n->SetFd(FD_MAGIC_NUMBER);
2795                                 Instance->SendMode(y, stackresult.size(), n);
2796                                 delete n;
2797                         }
2798                 }
2799                 return true;
2800         }
2801
2802         bool RemoteServer(const std::string &prefix, std::deque<std::string> &params)
2803         {
2804                 if (params.size() < 4)
2805                         return false;
2806
2807                 std::string servername = params[0];
2808                 std::string password = params[1];
2809                 // hopcount is not used for a remote server, we calculate this ourselves
2810                 std::string description = params[3];
2811                 TreeServer* ParentOfThis = Utils->FindServer(prefix);
2812
2813                 if (!ParentOfThis)
2814                 {
2815                         this->WriteLine("ERROR :Protocol error - Introduced remote server from unknown server "+prefix);
2816                         return false;
2817                 }
2818                 TreeServer* CheckDupe = Utils->FindServer(servername);
2819                 if (CheckDupe)
2820                 {
2821                         this->WriteLine("ERROR :Server "+servername+" already exists!");
2822                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+servername+"\2 denied, already exists");
2823                         return false;
2824                 }
2825                 TreeServer* Node = new TreeServer(this->Utils,this->Instance,servername,description,ParentOfThis,NULL);
2826                 ParentOfThis->AddChild(Node);
2827                 params[3] = ":" + params[3];
2828                 Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
2829                 this->Instance->SNO->WriteToSnoMask('l',"Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
2830                 return true;
2831         }
2832
2833         bool Outbound_Reply_Server(std::deque<std::string> &params)
2834         {
2835                 if (params.size() < 4)
2836                         return false;
2837
2838                 irc::string servername = params[0].c_str();
2839                 std::string sname = params[0];
2840                 std::string password = params[1];
2841                 int hops = atoi(params[2].c_str());
2842
2843                 if (hops)
2844                 {
2845                         this->WriteLine("ERROR :Server too far away for authentication");
2846                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
2847                         return false;
2848                 }
2849                 std::string description = params[3];
2850                 for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
2851                 {
2852                         if ((x->Name == servername) && (x->RecvPass == password))
2853                         {
2854                                 TreeServer* CheckDupe = Utils->FindServer(sname);
2855                                 if (CheckDupe)
2856                                 {
2857                                         this->WriteLine("ERROR :Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
2858                                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
2859                                         return false;
2860                                 }
2861                                 // Begin the sync here. this kickstarts the
2862                                 // other side, waiting in WAIT_AUTH_2 state,
2863                                 // into starting their burst, as it shows
2864                                 // that we're happy.
2865                                 this->LinkState = CONNECTED;
2866                                 // we should add the details of this server now
2867                                 // to the servers tree, as a child of the root
2868                                 // node.
2869                                 TreeServer* Node = new TreeServer(this->Utils,this->Instance,sname,description,Utils->TreeRoot,this);
2870                                 Utils->TreeRoot->AddChild(Node);
2871                                 params[3] = ":" + params[3];
2872                                 Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,sname);
2873                                 this->bursting = true;
2874                                 this->DoBurst(Node);
2875                                 return true;
2876                         }
2877                 }
2878                 this->WriteLine("ERROR :Invalid credentials");
2879                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
2880                 return false;
2881         }
2882
2883         bool Inbound_Server(std::deque<std::string> &params)
2884         {
2885                 if (params.size() < 4)
2886                         return false;
2887
2888                 irc::string servername = params[0].c_str();
2889                 std::string sname = params[0];
2890                 std::string password = params[1];
2891                 int hops = atoi(params[2].c_str());
2892
2893                 if (hops)
2894                 {
2895                         this->WriteLine("ERROR :Server too far away for authentication");
2896                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
2897                         return false;
2898                 }
2899                 std::string description = params[3];
2900                 for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
2901                 {
2902                         if ((x->Name == servername) && (x->RecvPass == password))
2903                         {
2904                                 TreeServer* CheckDupe = Utils->FindServer(sname);
2905                                 if (CheckDupe)
2906                                 {
2907                                         this->WriteLine("ERROR :Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
2908                                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
2909                                         return false;
2910                                 }
2911                                 /* If the config says this link is encrypted, but the remote side
2912                                  * hasnt bothered to send the AES command before SERVER, then we
2913                                  * boot them off as we MUST have this connection encrypted.
2914                                  */
2915                                 if ((x->EncryptionKey != "") && (!this->ctx_in))
2916                                 {
2917                                         this->WriteLine("ERROR :This link requires AES encryption to be enabled. Plaintext connection refused.");
2918                                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, remote server did not enable AES.");
2919                                         return false;
2920                                 }
2921                                 this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
2922                                 this->InboundServerName = sname;
2923                                 this->InboundDescription = description;
2924                                 // this is good. Send our details: Our server name and description and hopcount of 0,
2925                                 // along with the sendpass from this block.
2926                                 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+x->SendPass+" 0 :"+this->Instance->Config->ServerDesc);
2927                                 // move to the next state, we are now waiting for THEM.
2928                                 this->LinkState = WAIT_AUTH_2;
2929                                 return true;
2930                         }
2931                 }
2932                 this->WriteLine("ERROR :Invalid credentials");
2933                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
2934                 return false;
2935         }
2936
2937         void Split(const std::string &line, std::deque<std::string> &n)
2938         {
2939                 n.clear();
2940                 irc::tokenstream tokens(line);
2941                 std::string param;
2942                 while ((param = tokens.GetToken()) != "")
2943                         n.push_back(param);
2944                 return;
2945         }
2946
2947         bool ProcessLine(std::string &line)
2948         {
2949                 std::deque<std::string> params;
2950                 irc::string command;
2951                 std::string prefix;
2952
2953                 if (line.empty())
2954                         return true;
2955
2956                 line = line.substr(0, line.find_first_of("\r\n"));
2957
2958                 Instance->Log(DEBUG,"IN: %s", line.c_str());
2959
2960                 this->Split(line.c_str(),params);
2961
2962                 if ((params[0][0] == ':') && (params.size() > 1))
2963                 {
2964                         prefix = params[0].substr(1);
2965                         params.pop_front();
2966                 }
2967
2968                 command = params[0].c_str();
2969                 params.pop_front();
2970
2971                 if ((!this->ctx_in) && (command == "AES"))
2972                 {
2973                         std::string sserv = params[0];
2974                         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
2975                         {
2976                                 if ((x->EncryptionKey != "") && (x->Name == sserv))
2977                                 {
2978                                         this->InitAES(x->EncryptionKey,sserv);
2979                                 }
2980                         }
2981
2982                         return true;
2983                 }
2984                 else if ((this->ctx_in) && (command == "AES"))
2985                 {
2986                         this->Instance->SNO->WriteToSnoMask('l',"\2AES\2: Encryption already enabled on this connection yet %s is trying to enable it twice!",params[0].c_str());
2987                 }
2988
2989                 switch (this->LinkState)
2990                 {
2991                         TreeServer* Node;
2992
2993                         case WAIT_AUTH_1:
2994                                 // Waiting for SERVER command from remote server. Server initiating
2995                                 // the connection sends the first SERVER command, listening server
2996                                 // replies with theirs if its happy, then if the initiator is happy,
2997                                 // it starts to send its net sync, which starts the merge, otherwise
2998                                 // it sends an ERROR.
2999                                 if (command == "PASS")
3000                                 {
3001                                         /* Silently ignored */
3002                                 }
3003                                 else if (command == "SERVER")
3004                                 {
3005                                         return this->Inbound_Server(params);
3006                                 }
3007                                 else if (command == "ERROR")
3008                                 {
3009                                         return this->Error(params);
3010                                 }
3011                                 else if (command == "USER")
3012                                 {
3013                                         this->WriteLine("ERROR :Client connections to this port are prohibited.");
3014                                         return false;
3015                                 }
3016                                 else if (command == "CAPAB")
3017                                 {
3018                                         return this->Capab(params);
3019                                 }
3020                                 else if ((command == "U") || (command == "S"))
3021                                 {
3022                                         this->WriteLine("ERROR :Cannot use the old-style mesh linking protocol with m_spanningtree.so!");
3023                                         return false;
3024                                 }
3025                                 else
3026                                 {
3027                                         std::string error("ERROR :Invalid command in negotiation phase: ");
3028                                         error.append(command.c_str());
3029                                         this->WriteLine(error);
3030                                         return false;
3031                                 }
3032                         break;
3033                         case WAIT_AUTH_2:
3034                                 // Waiting for start of other side's netmerge to say they liked our
3035                                 // password.
3036                                 if (command == "SERVER")
3037                                 {
3038                                         // cant do this, they sent it to us in the WAIT_AUTH_1 state!
3039                                         // silently ignore.
3040                                         return true;
3041                                 }
3042                                 else if ((command == "U") || (command == "S"))
3043                                 {
3044                                         this->WriteLine("ERROR :Cannot use the old-style mesh linking protocol with m_spanningtree.so!");
3045                                         return false;
3046                                 }
3047                                 else if (command == "BURST")
3048                                 {
3049                                         if (params.size())
3050                                         {
3051                                                 /* If a time stamp is provided, try and check syncronization */
3052                                                 time_t THEM = atoi(params[0].c_str());
3053                                                 long delta = THEM-time(NULL);
3054                                                 if ((delta < -600) || (delta > 600))
3055                                                 {
3056                                                         this->Instance->SNO->WriteToSnoMask('l',"\2ERROR\2: Your clocks are out by %d seconds (this is more than ten minutes). Link aborted, \2PLEASE SYNC YOUR CLOCKS!\2",abs(delta));
3057                                                         this->WriteLine("ERROR :Your clocks are out by "+ConvToStr(abs(delta))+" seconds (this is more than ten minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
3058                                                         return false;
3059                                                 }
3060                                                 else if ((delta < -60) || (delta > 60))
3061                                                 {
3062                                                         this->Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds, please consider synching your clocks.",abs(delta));
3063                                                 }
3064                                         }
3065                                         this->LinkState = CONNECTED;
3066                                         Node = new TreeServer(this->Utils,this->Instance,InboundServerName,InboundDescription,Utils->TreeRoot,this);
3067                                         Utils->TreeRoot->AddChild(Node);
3068                                         params.clear();
3069                                         params.push_back(InboundServerName);
3070                                         params.push_back("*");
3071                                         params.push_back("1");
3072                                         params.push_back(":"+InboundDescription);
3073                                         Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,InboundServerName);
3074                                         this->bursting = true;
3075                                         this->DoBurst(Node);
3076                                 }
3077                                 else if (command == "ERROR")
3078                                 {
3079                                         return this->Error(params);
3080                                 }
3081                                 else if (command == "CAPAB")
3082                                 {
3083                                         return this->Capab(params);
3084                                 }
3085
3086                         break;
3087                         case LISTENER:
3088                                 this->WriteLine("ERROR :Internal error -- listening socket accepted its own descriptor!!!");
3089                                 return false;
3090                         break;
3091                         case CONNECTING:
3092                                 if (command == "SERVER")
3093                                 {
3094                                         // another server we connected to, which was in WAIT_AUTH_1 state,
3095                                         // has just sent us their credentials. If we get this far, theyre
3096                                         // happy with OUR credentials, and they are now in WAIT_AUTH_2 state.
3097                                         // if we're happy with this, we should send our netburst which
3098                                         // kickstarts the merge.
3099                                         return this->Outbound_Reply_Server(params);
3100                                 }
3101                                 else if (command == "ERROR")
3102                                 {
3103                                         return this->Error(params);
3104                                 }
3105                         break;
3106                         case CONNECTED:
3107                                 // This is the 'authenticated' state, when all passwords
3108                                 // have been exchanged and anything past this point is taken
3109                                 // as gospel.
3110
3111                                 if (prefix != "")
3112                                 {
3113                                         std::string direction = prefix;
3114                                         userrec* t = this->Instance->FindNick(prefix);
3115                                         if (t)
3116                                         {
3117                                                 direction = t->server;
3118                                         }
3119                                         TreeServer* route_back_again = Utils->BestRouteTo(direction);
3120                                         if ((!route_back_again) || (route_back_again->GetSocket() != this))
3121                                         {
3122                                                 if (route_back_again)
3123                                                         Instance->Log(DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
3124                                                 return true;
3125                                         }
3126
3127                                         /* Fix by brain:
3128                                          * When there is activity on the socket, reset the ping counter so
3129                                          * that we're not wasting bandwidth pinging an active server.
3130                                          */
3131                                         route_back_again->SetNextPingTime(time(NULL) + 60);
3132                                         route_back_again->SetPingFlag();
3133                                 }
3134
3135                                 if (command == "SVSMODE")
3136                                 {
3137                                         /* Services expects us to implement
3138                                          * SVSMODE. In inspircd its the same as
3139                                          * MODE anyway.
3140                                          */
3141                                         command = "MODE";
3142                                 }
3143                                 std::string target = "";
3144                                 /* Yes, know, this is a mess. Its reasonably fast though as we're
3145                                  * working with std::string here.
3146                                  */
3147                                 if ((command == "NICK") && (params.size() > 1))
3148                                 {
3149                                         return this->IntroduceClient(prefix,params);
3150                                 }
3151                                 else if (command == "FJOIN")
3152                                 {
3153                                         return this->ForceJoin(prefix,params);
3154                                 }
3155                                 else if (command == "STATS")
3156                                 {
3157                                         return this->Stats(prefix, params);
3158                                 }
3159                                 else if (command == "MOTD")
3160                                 {
3161                                         return this->Motd(prefix, params);
3162                                 }
3163                                 else if (command == "ADMIN")
3164                                 {
3165                                         return this->Admin(prefix, params);
3166                                 }
3167                                 else if (command == "SERVER")
3168                                 {
3169                                         return this->RemoteServer(prefix,params);
3170                                 }
3171                                 else if (command == "ERROR")
3172                                 {
3173                                         return this->Error(params);
3174                                 }
3175                                 else if (command == "OPERTYPE")
3176                                 {
3177                                         return this->OperType(prefix,params);
3178                                 }
3179                                 else if (command == "FMODE")
3180                                 {
3181                                         return this->ForceMode(prefix,params);
3182                                 }
3183                                 else if (command == "KILL")
3184                                 {
3185                                         return this->RemoteKill(prefix,params);
3186                                 }
3187                                 else if (command == "FTOPIC")
3188                                 {
3189                                         return this->ForceTopic(prefix,params);
3190                                 }
3191                                 else if (command == "REHASH")
3192                                 {
3193                                         return this->RemoteRehash(prefix,params);
3194                                 }
3195                                 else if (command == "METADATA")
3196                                 {
3197                                         return this->MetaData(prefix,params);
3198                                 }
3199                                 else if (command == "REMSTATUS")
3200                                 {
3201                                         return this->RemoveStatus(prefix,params);
3202                                 }
3203                                 else if (command == "PING")
3204                                 {
3205                                         /*
3206                                          * We just got a ping from a server that's bursting.
3207                                          * This can't be right, so set them to not bursting, and
3208                                          * apply their lines.
3209                                          */
3210                                         if (this->bursting)
3211                                         {
3212                                                 this->bursting = false;
3213                                                 Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
3214                                         }
3215                                         if (prefix == "")
3216                                         {
3217                                                 prefix = this->GetName();
3218                                         }
3219                                         return this->LocalPing(prefix,params);
3220                                 }
3221                                 else if (command == "PONG")
3222                                 {
3223                                         /*
3224                                          * We just got a pong from a server that's bursting.
3225                                          * This can't be right, so set them to not bursting, and
3226                                          * apply their lines.
3227                                          */
3228                                         if (this->bursting)
3229                                         {
3230                                                 this->bursting = false;
3231                                                 Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
3232                                         }
3233                                         if (prefix == "")
3234                                         {
3235                                                 prefix = this->GetName();
3236                                         }
3237                                         return this->LocalPong(prefix,params);
3238                                 }
3239                                 else if (command == "VERSION")
3240                                 {
3241                                         return this->ServerVersion(prefix,params);
3242                                 }
3243                                 else if (command == "FHOST")
3244                                 {
3245                                         return this->ChangeHost(prefix,params);
3246                                 }
3247                                 else if (command == "FNAME")
3248                                 {
3249                                         return this->ChangeName(prefix,params);
3250                                 }
3251                                 else if (command == "ADDLINE")
3252                                 {
3253                                         return this->AddLine(prefix,params);
3254                                 }
3255                                 else if (command == "SVSNICK")
3256                                 {
3257                                         if (prefix == "")
3258                                         {
3259                                                 prefix = this->GetName();
3260                                         }
3261                                         return this->ForceNick(prefix,params);
3262                                 }
3263                                 else if (command == "IDLE")
3264                                 {
3265                                         return this->Whois(prefix,params);
3266                                 }
3267                                 else if (command == "PUSH")
3268                                 {
3269                                         return this->Push(prefix,params);
3270                                 }
3271                                 else if (command == "TIME")
3272                                 {
3273                                         return this->Time(prefix,params);
3274                                 }
3275                                 else if ((command == "KICK") && (Utils->IsServer(prefix)))
3276                                 {
3277                                         std::string sourceserv = this->myhost;
3278                                         if (params.size() == 3)
3279                                         {
3280                                                 userrec* user = this->Instance->FindNick(params[1]);
3281                                                 chanrec* chan = this->Instance->FindChan(params[0]);
3282                                                 if (user && chan)
3283                                                 {
3284                                                         if (!chan->ServerKickUser(user, params[2].c_str(), false))
3285                                                                 /* Yikes, the channels gone! */
3286                                                                 delete chan;
3287                                                 }
3288                                         }
3289                                         if (this->InboundServerName != "")
3290                                         {
3291                                                 sourceserv = this->InboundServerName;
3292                                         }
3293                                         return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
3294                                 }
3295                                 else if (command == "SVSJOIN")
3296                                 {
3297                                         if (prefix == "")
3298                                         {
3299                                                 prefix = this->GetName();
3300                                         }
3301                                         return this->ServiceJoin(prefix,params);
3302                                 }
3303                                 else if (command == "SQUIT")
3304                                 {
3305                                         if (params.size() == 2)
3306                                         {
3307                                                 this->Squit(Utils->FindServer(params[0]),params[1]);
3308                                         }
3309                                         return true;
3310                                 }
3311                                 else if (command == "ENDBURST")
3312                                 {
3313                                         this->bursting = false;
3314                                         Instance->XLines->apply_lines(APPLY_ZLINES|APPLY_GLINES|APPLY_QLINES);
3315                                         std::string sourceserv = this->myhost;
3316                                         if (this->InboundServerName != "")
3317                                         {
3318                                                 sourceserv = this->InboundServerName;
3319                                         }
3320                                         this->Instance->SNO->WriteToSnoMask('l',"Received end of netburst from \2%s\2",sourceserv.c_str());
3321                                         return true;
3322                                 }
3323                                 else
3324                                 {
3325                                         // not a special inter-server command.
3326                                         // Emulate the actual user doing the command,
3327                                         // this saves us having a huge ugly parser.
3328                                         userrec* who = this->Instance->FindNick(prefix);
3329                                         std::string sourceserv = this->myhost;
3330                                         if (this->InboundServerName != "")
3331                                         {
3332                                                 sourceserv = this->InboundServerName;
3333                                         }
3334                                         if (who)
3335                                         {
3336                                                 if ((command == "NICK") && (params.size() > 0))
3337                                                 {
3338                                                         /* On nick messages, check that the nick doesnt
3339                                                          * already exist here. If it does, kill their copy,
3340                                                          * and our copy.
3341                                                          */
3342                                                         userrec* x = this->Instance->FindNick(params[0]);
3343                                                         if ((x) && (x != who))
3344                                                         {
3345                                                                 std::deque<std::string> p;
3346                                                                 p.push_back(params[0]);
3347                                                                 p.push_back("Nickname collision ("+prefix+" -> "+params[0]+")");
3348                                                                 Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
3349                                                                 p.clear();
3350                                                                 p.push_back(prefix);
3351                                                                 p.push_back("Nickname collision");
3352                                                                 Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
3353                                                                 userrec::QuitUser(this->Instance,x,"Nickname collision ("+prefix+" -> "+params[0]+")");
3354                                                                 userrec* y = this->Instance->FindNick(prefix);
3355                                                                 if (y)
3356                                                                 {
3357                                                                         userrec::QuitUser(this->Instance,y,"Nickname collision");
3358                                                                 }
3359                                                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
3360                                                         }
3361                                                 }
3362                                                 // its a user
3363                                                 target = who->server;
3364                                                 const char* strparams[127];
3365                                                 for (unsigned int q = 0; q < params.size(); q++)
3366                                                 {
3367                                                         strparams[q] = params[q].c_str();
3368                                                 }
3369                                                 switch (this->Instance->CallCommandHandler(command.c_str(), strparams, params.size(), who))
3370                                                 {
3371                                                         case CMD_INVALID:
3372                                                                 this->WriteLine("ERROR :Unrecognised command '"+std::string(command.c_str())+"' -- possibly loaded mismatched modules");
3373                                                                 return false;
3374                                                         break;
3375                                                         case CMD_FAILURE:
3376                                                                 return true;
3377                                                         break;
3378                                                         default:
3379                                                                 /* CMD_SUCCESS and CMD_USER_DELETED fall through here */
3380                                                         break;
3381                                                 }
3382                                         }
3383                                         else
3384                                         {
3385                                                 // its not a user. Its either a server, or somethings screwed up.
3386                                                 if (Utils->IsServer(prefix))
3387                                                 {
3388                                                         target = this->Instance->Config->ServerName;
3389                                                 }
3390                                                 else
3391                                                 {
3392                                                         Instance->Log(DEBUG,"Command with unknown origin '%s'",prefix.c_str());
3393                                                         return true;
3394                                                 }
3395                                         }
3396                                         return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
3397
3398                                 }
3399                                 return true;
3400                         break;
3401                 }
3402                 return true;
3403         }
3404
3405         virtual std::string GetName()
3406         {
3407                 std::string sourceserv = this->myhost;
3408                 if (this->InboundServerName != "")
3409                 {
3410                         sourceserv = this->InboundServerName;
3411                 }
3412                 return sourceserv;
3413         }
3414
3415         virtual void OnTimeout()
3416         {
3417                 if (this->LinkState == CONNECTING)
3418                 {
3419                         this->Instance->SNO->WriteToSnoMask('l',"CONNECT: Connection to \002"+myhost+"\002 timed out.");
3420                         Link* MyLink = Utils->FindLink(myhost);
3421                         if (MyLink)
3422                                 Utils->DoFailOver(MyLink);
3423                 }
3424         }
3425
3426         virtual void OnClose()
3427         {
3428                 // Connection closed.
3429                 // If the connection is fully up (state CONNECTED)
3430                 // then propogate a netsplit to all peers.
3431                 std::string quitserver = this->myhost;
3432                 if (this->InboundServerName != "")
3433                 {
3434                         quitserver = this->InboundServerName;
3435                 }
3436                 TreeServer* s = Utils->FindServer(quitserver);
3437                 if (s)
3438                 {
3439                         Squit(s,"Remote host closed the connection");
3440                 }
3441                 this->Instance->SNO->WriteToSnoMask('l',"Connection to '\2%s\2' failed.",quitserver.c_str());
3442         }
3443
3444         virtual int OnIncomingConnection(int newsock, char* ip)
3445         {
3446                 /* To prevent anyone from attempting to flood opers/DDoS by connecting to the server port,
3447                  * or discovering if this port is the server port, we don't allow connections from any
3448                  * IPs for which we don't have a link block.
3449                  */
3450                 bool found = false;
3451
3452                 found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
3453                 if (!found)
3454                 {
3455                         for (vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
3456                                 if (irc::sockets::MatchCIDR(ip, (*i).c_str()))
3457                                         found = true;
3458
3459                         if (!found)
3460                         {
3461                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from %s denied (no link blocks with that IP address)", ip);
3462                                 close(newsock);
3463                                 return false;
3464                         }
3465                 }
3466                 TreeSocket* s = new TreeSocket(this->Utils, this->Instance, newsock, ip);
3467                 s = s; /* Whinge whinge whinge, thats all GCC ever does. */
3468                 return true;
3469         }
3470 };
3471
3472 /** This class is used to resolve server hostnames during /connect and autoconnect.
3473  * As of 1.1, the resolver system is seperated out from InspSocket, so we must do this
3474  * resolver step first ourselves if we need it. This is totally nonblocking, and will
3475  * callback to OnLookupComplete or OnError when completed. Once it has completed we
3476  * will have an IP address which we can then use to continue our connection.
3477  */
3478 class ServernameResolver : public Resolver
3479 {
3480  private:
3481         /** A copy of the Link tag info for what we're connecting to.
3482          * We take a copy, rather than using a pointer, just in case the
3483          * admin takes the tag away and rehashes while the domain is resolving.
3484          */
3485         Link MyLink;
3486         SpanningTreeUtilities* Utils;
3487  public:
3488         ServernameResolver(SpanningTreeUtilities* Util, InspIRCd* Instance, const std::string &hostname, Link x) : Resolver(Instance, hostname, DNS_QUERY_FORWARD), MyLink(x), Utils(Util)
3489         {
3490                 /* Nothing in here, folks */
3491         }
3492
3493         void OnLookupComplete(const std::string &result)
3494         {
3495                 /* Initiate the connection, now that we have an IP to use.
3496                  * Passing a hostname directly to InspSocket causes it to
3497                  * just bail and set its FD to -1.
3498                  */
3499                 TreeServer* CheckDupe = Utils->FindServer(MyLink.Name.c_str());
3500                 if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
3501                 {
3502                         TreeSocket* newsocket = new TreeSocket(this->Utils, ServerInstance, result,MyLink.Port,false,10,MyLink.Name.c_str());
3503                         if (newsocket->GetFd() > -1)
3504                         {
3505                                 /* We're all OK */
3506                         }
3507                         else
3508                         {
3509                                 /* Something barfed, show the opers */
3510                                 ServerInstance->SNO->WriteToSnoMask('l',"CONNECT: Error connecting \002%s\002: %s.",MyLink.Name.c_str(),strerror(errno));
3511                                 delete newsocket;
3512                                 Utils->DoFailOver(&MyLink);
3513                         }
3514                 }
3515         }
3516
3517         void OnError(ResolverError e, const std::string &errormessage)
3518         {
3519                 /* Ooops! */
3520                 ServerInstance->SNO->WriteToSnoMask('l',"CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s",MyLink.Name.c_str(),errormessage.c_str());
3521                 Utils->DoFailOver(&MyLink);
3522         }
3523 };
3524
3525 /** Handle resolving of server IPs for the cache
3526  */
3527 class SecurityIPResolver : public Resolver
3528 {
3529  private:
3530         Link MyLink;
3531         SpanningTreeUtilities* Utils;
3532  public:
3533         SecurityIPResolver(SpanningTreeUtilities* U, InspIRCd* Instance, const std::string &hostname, Link x) : Resolver(Instance, hostname, DNS_QUERY_FORWARD), MyLink(x), Utils(U)
3534         {
3535         }
3536
3537         void OnLookupComplete(const std::string &result)
3538         {
3539                 ServerInstance->Log(DEBUG,"Security IP cache: Adding IP address '%s' for Link '%s'",result.c_str(),MyLink.Name.c_str());
3540                 Utils->ValidIPs.push_back(result);
3541         }
3542
3543         void OnError(ResolverError e, const std::string &errormessage)
3544         {
3545                 ServerInstance->Log(DEBUG,"Could not resolve IP associated with Link '%s': %s",MyLink.Name.c_str(),errormessage.c_str());
3546         }
3547 };
3548
3549 SpanningTreeUtilities::SpanningTreeUtilities(InspIRCd* Instance, ModuleSpanningTree* C) : ServerInstance(Instance), Creator(C)
3550 {
3551         Bindings.clear();
3552         this->ReadConfiguration(true);
3553         this->TreeRoot = new TreeServer(this, ServerInstance, ServerInstance->Config->ServerName, ServerInstance->Config->ServerDesc);
3554 }
3555
3556 SpanningTreeUtilities::~SpanningTreeUtilities()
3557 {
3558         for (unsigned int i = 0; i < Bindings.size(); i++)
3559         {
3560                 ServerInstance->Log(DEBUG,"Freeing binding %d of %d",i, Bindings.size());
3561                 ServerInstance->SE->DelFd(Bindings[i]);
3562                 Bindings[i]->Close();
3563                 DELETE(Bindings[i]);
3564         }
3565         ServerInstance->Log(DEBUG,"Freeing connected servers...");
3566         while (TreeRoot->ChildCount())
3567         {
3568                 TreeServer* child_server = TreeRoot->GetChild(0);
3569                 ServerInstance->Log(DEBUG,"Freeing connected server %s", child_server->GetName().c_str());
3570                 if (child_server)
3571                 {
3572                         TreeSocket* sock = child_server->GetSocket();
3573                         ServerInstance->SE->DelFd(sock);
3574                         sock->Close();
3575                         DELETE(sock);
3576                 }
3577         }
3578         delete TreeRoot;
3579 }
3580
3581 void SpanningTreeUtilities::AddThisServer(TreeServer* server, std::deque<TreeServer*> &list)
3582 {
3583         for (unsigned int c = 0; c < list.size(); c++)
3584         {
3585                 if (list[c] == server)
3586                 {
3587                         return;
3588                 }
3589         }
3590         list.push_back(server);
3591 }
3592
3593 /** returns a list of DIRECT servernames for a specific channel */
3594 void SpanningTreeUtilities::GetListOfServersForChannel(chanrec* c, std::deque<TreeServer*> &list)
3595 {
3596         CUList *ulist = c->GetUsers();
3597         for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
3598         {
3599                 if (i->second->GetFd() < 0)
3600                 {
3601                         TreeServer* best = this->BestRouteTo(i->second->server);
3602                         if (best)
3603                                 AddThisServer(best,list);
3604                 }
3605         }
3606         return;
3607 }
3608
3609 bool SpanningTreeUtilities::DoOneToAllButSenderRaw(const std::string &data, const std::string &omit, const std::string &prefix, const irc::string &command, std::deque<std::string> &params)
3610 {
3611         TreeServer* omitroute = this->BestRouteTo(omit);
3612         if ((command == "NOTICE") || (command == "PRIVMSG"))
3613         {
3614                 if (params.size() >= 2)
3615                 {
3616                         /* Prefixes */
3617                         if ((*(params[0].c_str()) == '@') || (*(params[0].c_str()) == '%') || (*(params[0].c_str()) == '+'))
3618                         {
3619                                 params[0] = params[0].substr(1, params[0].length()-1);
3620                         }
3621                         if ((*(params[0].c_str()) != '#') && (*(params[0].c_str()) != '$'))
3622                         {
3623                                 // special routing for private messages/notices
3624                                 userrec* d = ServerInstance->FindNick(params[0]);
3625                                 if (d)
3626                                 {
3627                                         std::deque<std::string> par;
3628                                         par.push_back(params[0]);
3629                                         par.push_back(":"+params[1]);
3630                                         this->DoOneToOne(prefix,command.c_str(),par,d->server);
3631                                         return true;
3632                                 }
3633                         }
3634                         else if (*(params[0].c_str()) == '$')
3635                         {
3636                                 std::deque<std::string> par;
3637                                 par.push_back(params[0]);
3638                                 par.push_back(":"+params[1]);
3639                                 this->DoOneToAllButSender(prefix,command.c_str(),par,omitroute->GetName());
3640                                 return true;
3641                         }
3642                         else
3643                         {
3644                                 chanrec* c = ServerInstance->FindChan(params[0]);
3645                                 if (c)
3646                                 {
3647                                         std::deque<TreeServer*> list;
3648                                         GetListOfServersForChannel(c,list);
3649                                         unsigned int lsize = list.size();
3650                                         for (unsigned int i = 0; i < lsize; i++)
3651                                         {
3652                                                 TreeSocket* Sock = list[i]->GetSocket();
3653                                                 if ((Sock) && (list[i]->GetName() != omit) && (omitroute != list[i]))
3654                                                 {
3655                                                         Sock->WriteLine(data);
3656                                                 }
3657                                         }
3658                                         return true;
3659                                 }
3660                         }
3661                 }
3662         }
3663         unsigned int items =this->TreeRoot->ChildCount();
3664         for (unsigned int x = 0; x < items; x++)
3665         {
3666                 TreeServer* Route = this->TreeRoot->GetChild(x);
3667                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
3668                 {
3669                         TreeSocket* Sock = Route->GetSocket();
3670                         if (Sock)
3671                                 Sock->WriteLine(data);
3672                 }
3673         }
3674         return true;
3675 }
3676
3677 bool SpanningTreeUtilities::DoOneToAllButSender(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string omit)
3678 {
3679         TreeServer* omitroute = this->BestRouteTo(omit);
3680         std::string FullLine = ":" + prefix + " " + command;
3681         unsigned int words = params.size();
3682         for (unsigned int x = 0; x < words; x++)
3683         {
3684                 FullLine = FullLine + " " + params[x];
3685         }
3686         unsigned int items = this->TreeRoot->ChildCount();
3687         for (unsigned int x = 0; x < items; x++)
3688         {
3689                 TreeServer* Route = this->TreeRoot->GetChild(x);
3690                 // Send the line IF:
3691                 // The route has a socket (its a direct connection)
3692                 // The route isnt the one to be omitted
3693                 // The route isnt the path to the one to be omitted
3694                 if ((Route) && (Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
3695                 {
3696                         TreeSocket* Sock = Route->GetSocket();
3697                         if (Sock)
3698                                 Sock->WriteLine(FullLine);
3699                 }
3700         }
3701         return true;
3702 }
3703
3704 bool SpanningTreeUtilities::DoOneToMany(const std::string &prefix, const std::string &command, std::deque<std::string> &params)
3705 {
3706         std::string FullLine = ":" + prefix + " " + command;
3707         unsigned int words = params.size();
3708         for (unsigned int x = 0; x < words; x++)
3709         {
3710                 FullLine = FullLine + " " + params[x];
3711         }
3712         unsigned int items = this->TreeRoot->ChildCount();
3713         for (unsigned int x = 0; x < items; x++)
3714         {
3715                 TreeServer* Route = this->TreeRoot->GetChild(x);
3716                 if (Route && Route->GetSocket())
3717                 {
3718                         TreeSocket* Sock = Route->GetSocket();
3719                         if (Sock)
3720                                 Sock->WriteLine(FullLine);
3721                 }
3722         }
3723         return true;
3724 }
3725
3726 bool SpanningTreeUtilities::DoOneToMany(const char* prefix, const char* command, std::deque<std::string> &params)
3727 {
3728         std::string spfx = prefix;
3729         std::string scmd = command;
3730         return this->DoOneToMany(spfx, scmd, params);
3731 }
3732
3733 bool SpanningTreeUtilities::DoOneToAllButSender(const char* prefix, const char* command, std::deque<std::string> &params, std::string omit)
3734 {
3735         std::string spfx = prefix;
3736         std::string scmd = command;
3737         return this->DoOneToAllButSender(spfx, scmd, params, omit);
3738 }
3739
3740 bool SpanningTreeUtilities::DoOneToOne(const std::string &prefix, const std::string &command, std::deque<std::string> &params, std::string target)
3741 {
3742         TreeServer* Route = this->BestRouteTo(target);
3743         if (Route)
3744         {
3745                 std::string FullLine = ":" + prefix + " " + command;
3746                 unsigned int words = params.size();
3747                 for (unsigned int x = 0; x < words; x++)
3748                 {
3749                         FullLine = FullLine + " " + params[x];
3750                 }
3751                 if (Route && Route->GetSocket())
3752                 {
3753                         TreeSocket* Sock = Route->GetSocket();
3754                         if (Sock)
3755                                 Sock->WriteLine(FullLine);
3756                 }
3757                 return true;
3758         }
3759         else
3760         {
3761                 return false;
3762         }
3763 }
3764
3765 void SpanningTreeUtilities::ReadConfiguration(bool rebind)
3766 {
3767         ConfigReader* Conf = new ConfigReader(ServerInstance);
3768         if (rebind)
3769         {
3770                 for (int j =0; j < Conf->Enumerate("bind"); j++)
3771                 {
3772                         std::string Type = Conf->ReadValue("bind","type",j);
3773                         std::string IP = Conf->ReadValue("bind","address",j);
3774                         int Port = Conf->ReadInteger("bind","port",j,true);
3775                         if (Type == "servers")
3776                         {
3777                                 ServerInstance->Log(DEBUG,"m_spanningtree: Binding server port %s:%d", IP.c_str(), Port);
3778                                 if (IP == "*")
3779                                 {
3780                                         IP = "";
3781                                 }
3782                                 TreeSocket* listener = new TreeSocket(this, ServerInstance, IP.c_str(),Port,true,10);
3783                                 if (listener->GetState() == I_LISTENING)
3784                                 {
3785                                         ServerInstance->Log(DEFAULT,"m_spanningtree: Binding server port %s:%d successful!", IP.c_str(), Port);
3786                                         Bindings.push_back(listener);
3787                                 }
3788                                 else
3789                                 {
3790                                         ServerInstance->Log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port %d",Port);
3791                                         listener->Close();
3792                                         DELETE(listener);
3793                                 }
3794                                 ServerInstance->Log(DEBUG,"Done with this binding");
3795                         }
3796                 }
3797         }
3798         FlatLinks = Conf->ReadFlag("options","flatlinks",0);
3799         HideULines = Conf->ReadFlag("options","hideulines",0);
3800         AnnounceTSChange = Conf->ReadFlag("options","announcets",0);
3801         LinkBlocks.clear();
3802         ValidIPs.clear();
3803         for (int j =0; j < Conf->Enumerate("link"); j++)
3804         {
3805                 Link L;
3806                 std::string Allow = Conf->ReadValue("link","allowmask",j);
3807                 L.Name = (Conf->ReadValue("link","name",j)).c_str();
3808                 L.IPAddr = Conf->ReadValue("link","ipaddr",j);
3809                 L.FailOver = Conf->ReadValue("link","failover",j).c_str();
3810                 L.Port = Conf->ReadInteger("link","port",j,true);
3811                 L.SendPass = Conf->ReadValue("link","sendpass",j);
3812                 L.RecvPass = Conf->ReadValue("link","recvpass",j);
3813                 L.AutoConnect = Conf->ReadInteger("link","autoconnect",j,true);
3814                 L.EncryptionKey =  Conf->ReadValue("link","encryptionkey",j);
3815                 L.HiddenFromStats = Conf->ReadFlag("link","hidden",j);
3816                 L.NextConnectTime = time(NULL) + L.AutoConnect;
3817                 /* Bugfix by brain, do not allow people to enter bad configurations */
3818                 if (L.Name != ServerInstance->Config->ServerName)
3819                 {
3820                         if ((L.IPAddr != "") && (L.RecvPass != "") && (L.SendPass != "") && (L.Name != "") && (L.Port))
3821                         {
3822                                 ValidIPs.push_back(L.IPAddr);
3823
3824                                 if (Allow.length())
3825                                         ValidIPs.push_back(Allow);
3826
3827                                 /* Needs resolving */
3828                                 insp_inaddr binip;
3829                                 if (insp_aton(L.IPAddr.c_str(), &binip) < 1)
3830                                 {
3831                                         try
3832                                         {
3833                                                 SecurityIPResolver* sr = new SecurityIPResolver(this, ServerInstance, L.IPAddr, L);
3834                                                 ServerInstance->AddResolver(sr);
3835                                         }
3836                                         catch (ModuleException& e)
3837                                         {
3838                                                 ServerInstance->Log(DEBUG,"Error in resolver: %s",e.GetReason());
3839                                         }
3840                                 }
3841
3842                                 LinkBlocks.push_back(L);
3843                                 ServerInstance->Log(DEBUG,"m_spanningtree: Read server %s with host %s:%d",L.Name.c_str(),L.IPAddr.c_str(),L.Port);
3844                         }
3845                         else
3846                         {
3847                                 if (L.IPAddr == "")
3848                                 {
3849                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', IP address not defined!",L.Name.c_str());
3850                                 }
3851                                 else if (L.RecvPass == "")
3852                                 {
3853                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', recvpass not defined!",L.Name.c_str());
3854                                 }
3855                                 else if (L.SendPass == "")
3856                                 {
3857                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', sendpass not defined!",L.Name.c_str());
3858                                 }
3859                                 else if (L.Name == "")
3860                                 {
3861                                         ServerInstance->Log(DEFAULT,"Invalid configuration, link tag without a name!");
3862                                 }
3863                                 else if (!L.Port)
3864                                 {
3865                                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', no port specified!",L.Name.c_str());
3866                                 }
3867                         }
3868                 }
3869                 else
3870                 {
3871                         ServerInstance->Log(DEFAULT,"Invalid configuration for server '%s', link tag has the same server name as the local server!",L.Name.c_str());
3872                 }
3873         }
3874         DELETE(Conf);
3875 }
3876
3877
3878
3879 class ModuleSpanningTree : public Module
3880 {
3881         int line;
3882         int NumServers;
3883         unsigned int max_local;
3884         unsigned int max_global;
3885         cmd_rconnect* command_rconnect;
3886         SpanningTreeUtilities* Utils;
3887
3888  public:
3889
3890         ModuleSpanningTree(InspIRCd* Me)
3891                 : Module::Module(Me), max_local(0), max_global(0)
3892         {
3893                 Utils = new SpanningTreeUtilities(Me, this);
3894
3895                 command_rconnect = new cmd_rconnect(ServerInstance, this, Utils);
3896                 ServerInstance->AddCommand(command_rconnect);
3897         }
3898
3899         void ShowLinks(TreeServer* Current, userrec* user, int hops)
3900         {
3901                 std::string Parent = Utils->TreeRoot->GetName();
3902                 if (Current->GetParent())
3903                 {
3904                         Parent = Current->GetParent()->GetName();
3905                 }
3906                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
3907                 {
3908                         if ((Utils->HideULines) && (ServerInstance->ULine(Current->GetChild(q)->GetName().c_str())))
3909                         {
3910                                 if (*user->oper)
3911                                 {
3912                                          ShowLinks(Current->GetChild(q),user,hops+1);
3913                                 }
3914                         }
3915                         else
3916                         {
3917                                 ShowLinks(Current->GetChild(q),user,hops+1);
3918                         }
3919                 }
3920                 /* Don't display the line if its a uline, hide ulines is on, and the user isnt an oper */
3921                 if ((Utils->HideULines) && (ServerInstance->ULine(Current->GetName().c_str())) && (!*user->oper))
3922                         return;
3923                 user->WriteServ("364 %s %s %s :%d %s",user->nick,Current->GetName().c_str(),(Utils->FlatLinks && (!*user->oper)) ? ServerInstance->Config->ServerName : Parent.c_str(),(Utils->FlatLinks && (!*user->oper)) ? 0 : hops,Current->GetDesc().c_str());
3924         }
3925
3926         int CountLocalServs()
3927         {
3928                 return Utils->TreeRoot->ChildCount();
3929         }
3930
3931         int CountServs()
3932         {
3933                 return Utils->serverlist.size();
3934         }
3935
3936         void HandleLinks(const char** parameters, int pcnt, userrec* user)
3937         {
3938                 ShowLinks(Utils->TreeRoot,user,0);
3939                 user->WriteServ("365 %s * :End of /LINKS list.",user->nick);
3940                 return;
3941         }
3942
3943         void HandleLusers(const char** parameters, int pcnt, userrec* user)
3944         {
3945                 unsigned int n_users = ServerInstance->UserCount();
3946
3947                 /* Only update these when someone wants to see them, more efficient */
3948                 if ((unsigned int)ServerInstance->LocalUserCount() > max_local)
3949                         max_local = ServerInstance->LocalUserCount();
3950                 if (n_users > max_global)
3951                         max_global = n_users;
3952
3953                 user->WriteServ("251 %s :There are %d users and %d invisible on %d servers",user->nick,n_users-ServerInstance->InvisibleUserCount(),ServerInstance->InvisibleUserCount(),this->CountServs());
3954                 if (ServerInstance->OperCount())
3955                         user->WriteServ("252 %s %d :operator(s) online",user->nick,ServerInstance->OperCount());
3956                 if (ServerInstance->UnregisteredUserCount())
3957                         user->WriteServ("253 %s %d :unknown connections",user->nick,ServerInstance->UnregisteredUserCount());
3958                 if (ServerInstance->ChannelCount())
3959                         user->WriteServ("254 %s %d :channels formed",user->nick,ServerInstance->ChannelCount());
3960                 user->WriteServ("254 %s :I have %d clients and %d servers",user->nick,ServerInstance->LocalUserCount(),this->CountLocalServs());
3961                 user->WriteServ("265 %s :Current Local Users: %d  Max: %d",user->nick,ServerInstance->LocalUserCount(),max_local);
3962                 user->WriteServ("266 %s :Current Global Users: %d  Max: %d",user->nick,n_users,max_global);
3963                 return;
3964         }
3965
3966         // WARNING: NOT THREAD SAFE - DONT GET ANY SMART IDEAS.
3967
3968         void ShowMap(TreeServer* Current, userrec* user, int depth, char matrix[128][80], float &totusers, float &totservers)
3969         {
3970                 if (line < 128)
3971                 {
3972                         for (int t = 0; t < depth; t++)
3973                         {
3974                                 matrix[line][t] = ' ';
3975                         }
3976
3977                         // For Aligning, we need to work out exactly how deep this thing is, and produce
3978                         // a 'Spacer' String to compensate.
3979                         char spacer[40];
3980
3981                         memset(spacer,' ',40);
3982                         if ((40 - Current->GetName().length() - depth) > 1) {
3983                                 spacer[40 - Current->GetName().length() - depth] = '\0';
3984                         }
3985                         else
3986                         {
3987                                 spacer[5] = '\0';
3988                         }
3989
3990                         float percent;
3991                         char text[80];
3992                         if (ServerInstance->clientlist.size() == 0) {
3993                                 // If there are no users, WHO THE HELL DID THE /MAP?!?!?!
3994                                 percent = 0;
3995                         }
3996                         else
3997                         {
3998                                 percent = ((float)Current->GetUserCount() / (float)ServerInstance->clientlist.size()) * 100;
3999                         }
4000                         snprintf(text, 80, "%s %s%5d [%5.2f%%]", Current->GetName().c_str(), spacer, Current->GetUserCount(), percent);
4001                         totusers += Current->GetUserCount();
4002                         totservers++;
4003                         strlcpy(&matrix[line][depth],text,80);
4004                         line++;
4005                         for (unsigned int q = 0; q < Current->ChildCount(); q++)
4006                         {
4007                                 if ((Utils->HideULines) && (ServerInstance->ULine(Current->GetChild(q)->GetName().c_str())))
4008                                 {
4009                                         if (*user->oper)
4010                                         {
4011                                                 ShowMap(Current->GetChild(q),user,(Utils->FlatLinks && (!*user->oper)) ? depth : depth+2,matrix,totusers,totservers);
4012                                         }
4013                                 }
4014                                 else
4015                                 {
4016                                         ShowMap(Current->GetChild(q),user,(Utils->FlatLinks && (!*user->oper)) ? depth : depth+2,matrix,totusers,totservers);
4017                                 }
4018                         }
4019                 }
4020         }
4021
4022         int HandleMotd(const char** parameters, int pcnt, userrec* user)
4023         {
4024                 if (pcnt > 0)
4025                 {
4026                         /* Remote MOTD, the server is within the 1st parameter */
4027                         std::deque<std::string> params;
4028                         params.push_back(parameters[0]);
4029
4030                         /* Send it out remotely, generate no reply yet */
4031                         TreeServer* s = Utils->FindServerMask(parameters[0]);
4032                         if (s)
4033                         {
4034                                 Utils->DoOneToOne(user->nick, "MOTD", params, s->GetName());
4035                         }
4036                         else
4037                         {
4038                                 user->WriteServ( "402 %s %s :No such server", user->nick, parameters[0]);
4039                         }
4040                         return 1;
4041                 }
4042                 return 0;
4043         }
4044
4045         int HandleAdmin(const char** parameters, int pcnt, userrec* user)
4046         {
4047                 if (pcnt > 0)
4048                 {
4049                         /* Remote ADMIN, the server is within the 1st parameter */
4050                         std::deque<std::string> params;
4051                         params.push_back(parameters[0]);
4052
4053                         /* Send it out remotely, generate no reply yet */
4054                         TreeServer* s = Utils->FindServerMask(parameters[0]);
4055                         if (s)
4056                         {
4057                                 Utils->DoOneToOne(user->nick, "ADMIN", params, s->GetName());
4058                         }
4059                         else
4060                         {
4061                                 user->WriteServ( "402 %s %s :No such server", user->nick, parameters[0]);
4062                         }
4063                         return 1;
4064                 }
4065                 return 0;
4066         }
4067
4068         int HandleStats(const char** parameters, int pcnt, userrec* user)
4069         {
4070                 if (pcnt > 1)
4071                 {
4072                         /* Remote STATS, the server is within the 2nd parameter */
4073                         std::deque<std::string> params;
4074                         params.push_back(parameters[0]);
4075                         params.push_back(parameters[1]);
4076                         /* Send it out remotely, generate no reply yet */
4077                         TreeServer* s = Utils->FindServerMask(parameters[1]);
4078                         if (s)
4079                         {
4080                                 params[1] = s->GetName();
4081                                 Utils->DoOneToOne(user->nick, "STATS", params, s->GetName());
4082                         }
4083                         else
4084                         {
4085                                 user->WriteServ( "402 %s %s :No such server", user->nick, parameters[0]);
4086                         }
4087                         return 1;
4088                 }
4089                 return 0;
4090         }
4091
4092         // Ok, prepare to be confused.
4093         // After much mulling over how to approach this, it struck me that
4094         // the 'usual' way of doing a /MAP isnt the best way. Instead of
4095         // keeping track of a ton of ascii characters, and line by line
4096         // under recursion working out where to place them using multiplications
4097         // and divisons, we instead render the map onto a backplane of characters
4098         // (a character matrix), then draw the branches as a series of "L" shapes
4099         // from the nodes. This is not only friendlier on CPU it uses less stack.
4100
4101         void HandleMap(const char** parameters, int pcnt, userrec* user)
4102         {
4103                 // This array represents a virtual screen which we will
4104                 // "scratch" draw to, as the console device of an irc
4105                 // client does not provide for a proper terminal.
4106                 float totusers = 0;
4107                 float totservers = 0;
4108                 char matrix[128][80];
4109                 for (unsigned int t = 0; t < 128; t++)
4110                 {
4111                         matrix[t][0] = '\0';
4112                 }
4113                 line = 0;
4114                 // The only recursive bit is called here.
4115                 ShowMap(Utils->TreeRoot,user,0,matrix,totusers,totservers);
4116                 // Process each line one by one. The algorithm has a limit of
4117                 // 128 servers (which is far more than a spanning tree should have
4118                 // anyway, so we're ok). This limit can be raised simply by making
4119                 // the character matrix deeper, 128 rows taking 10k of memory.
4120                 for (int l = 1; l < line; l++)
4121                 {
4122                         // scan across the line looking for the start of the
4123                         // servername (the recursive part of the algorithm has placed
4124                         // the servers at indented positions depending on what they
4125                         // are related to)
4126                         int first_nonspace = 0;
4127                         while (matrix[l][first_nonspace] == ' ')
4128                         {
4129                                 first_nonspace++;
4130                         }
4131                         first_nonspace--;
4132                         // Draw the `- (corner) section: this may be overwritten by
4133                         // another L shape passing along the same vertical pane, becoming
4134                         // a |- (branch) section instead.
4135                         matrix[l][first_nonspace] = '-';
4136                         matrix[l][first_nonspace-1] = '`';
4137                         int l2 = l - 1;
4138                         // Draw upwards until we hit the parent server, causing possibly
4139                         // other corners (`-) to become branches (|-)
4140                         while ((matrix[l2][first_nonspace-1] == ' ') || (matrix[l2][first_nonspace-1] == '`'))
4141                         {
4142                                 matrix[l2][first_nonspace-1] = '|';
4143                                 l2--;
4144                         }
4145                 }
4146                 // dump the whole lot to the user. This is the easy bit, honest.
4147                 for (int t = 0; t < line; t++)
4148                 {
4149                         user->WriteServ("006 %s :%s",user->nick,&matrix[t][0]);
4150                 }
4151                 float avg_users = totusers / totservers;
4152                 user->WriteServ("270 %s :%.0f server%s and %.0f user%s, average %.2f users per server",user->nick,totservers,(totservers > 1 ? "s" : ""),totusers,(totusers > 1 ? "s" : ""),avg_users);
4153         user->WriteServ("007 %s :End of /MAP",user->nick);
4154                 return;
4155         }
4156
4157         int HandleSquit(const char** parameters, int pcnt, userrec* user)
4158         {
4159                 TreeServer* s = Utils->FindServerMask(parameters[0]);
4160                 if (s)
4161                 {
4162                         if (s == Utils->TreeRoot)
4163                         {
4164                                  user->WriteServ("NOTICE %s :*** SQUIT: Foolish mortal, you cannot make a server SQUIT itself! (%s matches local server name)",user->nick,parameters[0]);
4165                                 return 1;
4166                         }
4167                         TreeSocket* sock = s->GetSocket();
4168                         if (sock)
4169                         {
4170                                 ServerInstance->Log(DEBUG,"Splitting server %s",s->GetName().c_str());
4171                                 ServerInstance->SNO->WriteToSnoMask('l',"SQUIT: Server \002%s\002 removed from network by %s",parameters[0],user->nick);
4172                                 sock->Squit(s,"Server quit by "+std::string(user->nick)+"!"+std::string(user->ident)+"@"+std::string(user->host));
4173                                 ServerInstance->SE->DelFd(sock);
4174                                 sock->Close();
4175                                 delete sock;
4176                         }
4177                         else
4178                         {
4179                                 user->WriteServ("NOTICE %s :*** SQUIT: The server \002%s\002 is not directly connected.",user->nick,parameters[0]);
4180                         }
4181                 }
4182                 else
4183                 {
4184                          user->WriteServ("NOTICE %s :*** SQUIT: The server \002%s\002 does not exist on the network.",user->nick,parameters[0]);
4185                 }
4186                 return 1;
4187         }
4188
4189         int HandleTime(const char** parameters, int pcnt, userrec* user)
4190         {
4191                 if ((IS_LOCAL(user)) && (pcnt))
4192                 {
4193                         TreeServer* found = Utils->FindServerMask(parameters[0]);
4194                         if (found)
4195                         {
4196                                 // we dont' override for local server
4197                                 if (found == Utils->TreeRoot)
4198                                         return 0;
4199
4200                                 std::deque<std::string> params;
4201                                 params.push_back(found->GetName());
4202                                 params.push_back(user->nick);
4203                                 Utils->DoOneToOne(ServerInstance->Config->ServerName,"TIME",params,found->GetName());
4204                         }
4205                         else
4206                         {
4207                                 user->WriteServ("402 %s %s :No such server",user->nick,parameters[0]);
4208                         }
4209                 }
4210                 return 1;
4211         }
4212
4213         int HandleRemoteWhois(const char** parameters, int pcnt, userrec* user)
4214         {
4215                 if ((IS_LOCAL(user)) && (pcnt > 1))
4216                 {
4217                         userrec* remote = ServerInstance->FindNick(parameters[1]);
4218                         if ((remote) && (remote->GetFd() < 0))
4219                         {
4220                                 std::deque<std::string> params;
4221                                 params.push_back(parameters[1]);
4222                                 Utils->DoOneToOne(user->nick,"IDLE",params,remote->server);
4223                                 return 1;
4224                         }
4225                         else if (!remote)
4226                         {
4227                                 user->WriteServ("401 %s %s :No such nick/channel",user->nick, parameters[1]);
4228                                 user->WriteServ("318 %s %s :End of /WHOIS list.",user->nick, parameters[1]);
4229                                 return 1;
4230                         }
4231                 }
4232                 return 0;
4233         }
4234
4235         void DoPingChecks(time_t curtime)
4236         {
4237                 for (unsigned int j = 0; j < Utils->TreeRoot->ChildCount(); j++)
4238                 {
4239                         TreeServer* serv = Utils->TreeRoot->GetChild(j);
4240                         TreeSocket* sock = serv->GetSocket();
4241                         if (sock)
4242                         {
4243                                 if (curtime >= serv->NextPingTime())
4244                                 {
4245                                         if (serv->AnsweredLastPing())
4246                                         {
4247                                                 sock->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" PING "+serv->GetName());
4248                                                 serv->SetNextPingTime(curtime + 60);
4249                                         }
4250                                         else
4251                                         {
4252                                                 // they didnt answer, boot them
4253                                                 ServerInstance->SNO->WriteToSnoMask('l',"Server \002%s\002 pinged out",serv->GetName().c_str());
4254                                                 sock->Squit(serv,"Ping timeout");
4255                                                 ServerInstance->SE->DelFd(sock);
4256                                                 sock->Close();
4257                                                 delete sock;
4258                                                 return;
4259                                         }
4260                                 }
4261                         }
4262                 }
4263         }
4264
4265         void ConnectServer(Link* x)
4266         {
4267                 insp_inaddr binip;
4268
4269                 /* Do we already have an IP? If so, no need to resolve it. */
4270                 if (insp_aton(x->IPAddr.c_str(), &binip) > 0)
4271                 {
4272                         TreeSocket* newsocket = new TreeSocket(Utils, ServerInstance, x->IPAddr,x->Port,false,10,x->Name.c_str());
4273                         if (newsocket->GetFd() > -1)
4274                         {
4275                                 /* Handled automatically on success */
4276                         }
4277                         else
4278                         {
4279                                 ServerInstance->SNO->WriteToSnoMask('l',"CONNECT: Error connecting \002%s\002: %s.",x->Name.c_str(),strerror(errno));
4280                                 delete newsocket;
4281                                 Utils->DoFailOver(x);
4282                         }
4283                 }
4284                 else
4285                 {
4286                         try
4287                         {
4288                                 ServernameResolver* snr = new ServernameResolver(Utils, ServerInstance,x->IPAddr, *x);
4289                                 ServerInstance->AddResolver(snr);
4290                         }
4291                         catch (ModuleException& e)
4292                         {
4293                                 ServerInstance->Log(DEBUG,"Error in resolver: %s",e.GetReason());
4294                                 Utils->DoFailOver(x);
4295                         }
4296                 }
4297         }
4298
4299         void AutoConnectServers(time_t curtime)
4300         {
4301                 for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
4302                 {
4303                         if ((x->AutoConnect) && (curtime >= x->NextConnectTime))
4304                         {
4305                                 ServerInstance->Log(DEBUG,"Auto-Connecting %s",x->Name.c_str());
4306                                 x->NextConnectTime = curtime + x->AutoConnect;
4307                                 TreeServer* CheckDupe = Utils->FindServer(x->Name.c_str());
4308                                 if (x->FailOver.length())
4309                                 {
4310                                         TreeServer* CheckFailOver = Utils->FindServer(x->FailOver.c_str());
4311                                         if (CheckFailOver)
4312                                         {
4313                                                 /* The failover for this server is currently a member of the network.
4314                                                  * The failover probably succeeded, where the main link did not.
4315                                                  * Don't try the main link until the failover is gone again.
4316                                                  */
4317                                                 continue;
4318                                         }
4319                                 }
4320                                 if (!CheckDupe)
4321                                 {
4322                                         // an autoconnected server is not connected. Check if its time to connect it
4323                                         ServerInstance->SNO->WriteToSnoMask('l',"AUTOCONNECT: Auto-connecting server \002%s\002 (%lu seconds until next attempt)",x->Name.c_str(),x->AutoConnect);
4324                                         this->ConnectServer(&(*x));
4325                                 }
4326                         }
4327                 }
4328         }
4329
4330         int HandleVersion(const char** parameters, int pcnt, userrec* user)
4331         {
4332                 // we've already checked if pcnt > 0, so this is safe
4333                 TreeServer* found = Utils->FindServerMask(parameters[0]);
4334                 if (found)
4335                 {
4336                         std::string Version = found->GetVersion();
4337                         user->WriteServ("351 %s :%s",user->nick,Version.c_str());
4338                         if (found == Utils->TreeRoot)
4339                         {
4340                                 std::stringstream out(ServerInstance->Config->data005);
4341                                 std::string token = "";
4342                                 std::string line5 = "";
4343                                 int token_counter = 0;
4344
4345                                 while (!out.eof())
4346                                 {
4347                                         out >> token;
4348                                         line5 = line5 + token + " ";
4349                                         token_counter++;
4350
4351                                         if ((token_counter >= 13) || (out.eof() == true))
4352                                         {
4353                                                 user->WriteServ("005 %s %s:are supported by this server",user->nick,line5.c_str());
4354                                                 line5 = "";
4355                                                 token_counter = 0;
4356                                         }
4357                                 }
4358                         }
4359                 }
4360                 else
4361                 {
4362                         user->WriteServ("402 %s %s :No such server",user->nick,parameters[0]);
4363                 }
4364                 return 1;
4365         }
4366
4367         int HandleConnect(const char** parameters, int pcnt, userrec* user)
4368         {
4369                 for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
4370                 {
4371                         if (ServerInstance->MatchText(x->Name.c_str(),parameters[0]))
4372                         {
4373                                 TreeServer* CheckDupe = Utils->FindServer(x->Name.c_str());
4374                                 if (!CheckDupe)
4375                                 {
4376                                         user->WriteServ("NOTICE %s :*** CONNECT: Connecting to server: \002%s\002 (%s:%d)",user->nick,x->Name.c_str(),(x->HiddenFromStats ? "<hidden>" : x->IPAddr.c_str()),x->Port);
4377                                         ConnectServer(&(*x));
4378                                         return 1;
4379                                 }
4380                                 else
4381                                 {
4382                                         user->WriteServ("NOTICE %s :*** CONNECT: Server \002%s\002 already exists on the network and is connected via \002%s\002",user->nick,x->Name.c_str(),CheckDupe->GetParent()->GetName().c_str());
4383                                         return 1;
4384                                 }
4385                         }
4386                 }
4387                 user->WriteServ("NOTICE %s :*** CONNECT: No server matching \002%s\002 could be found in the config file.",user->nick,parameters[0]);
4388                 return 1;
4389         }
4390
4391         virtual int OnStats(char statschar, userrec* user, string_list &results)
4392         {
4393                 if (statschar == 'c')
4394                 {
4395                         for (unsigned int i = 0; i < Utils->LinkBlocks.size(); i++)
4396                         {
4397                                 results.push_back(std::string(ServerInstance->Config->ServerName)+" 213 "+user->nick+" C *@"+(Utils->LinkBlocks[i].HiddenFromStats ? "<hidden>" : Utils->LinkBlocks[i].IPAddr)+" * "+Utils->LinkBlocks[i].Name.c_str()+" "+ConvToStr(Utils->LinkBlocks[i].Port)+" "+(Utils->LinkBlocks[i].EncryptionKey != "" ? 'e' : '-')+(Utils->LinkBlocks[i].AutoConnect ? 'a' : '-')+'s');
4398                                 results.push_back(std::string(ServerInstance->Config->ServerName)+" 244 "+user->nick+" H * * "+Utils->LinkBlocks[i].Name.c_str());
4399                         }
4400                         results.push_back(std::string(ServerInstance->Config->ServerName)+" 219 "+user->nick+" "+statschar+" :End of /STATS report");
4401                         ServerInstance->SNO->WriteToSnoMask('t',"Notice: %s '%c' requested by %s (%s@%s)",(!strcmp(user->server,ServerInstance->Config->ServerName) ? "Stats" : "Remote stats"),statschar,user->nick,user->ident,user->host);
4402                         return 1;
4403                 }
4404                 return 0;
4405         }
4406
4407         virtual int OnPreCommand(const std::string &command, const char** parameters, int pcnt, userrec *user, bool validated, const std::string &original_line)
4408         {
4409                 /* If the command doesnt appear to be valid, we dont want to mess with it. */
4410                 if (!validated)
4411                         return 0;
4412
4413                 if (command == "CONNECT")
4414                 {
4415                         return this->HandleConnect(parameters,pcnt,user);
4416                 }
4417                 else if (command == "STATS")
4418                 {
4419                         return this->HandleStats(parameters,pcnt,user);
4420                 }
4421                 else if (command == "MOTD")
4422                 {
4423                         return this->HandleMotd(parameters,pcnt,user);
4424                 }
4425                 else if (command == "ADMIN")
4426                 {
4427                         return this->HandleAdmin(parameters,pcnt,user);
4428                 }
4429                 else if (command == "SQUIT")
4430                 {
4431                         return this->HandleSquit(parameters,pcnt,user);
4432                 }
4433                 else if (command == "MAP")
4434                 {
4435                         this->HandleMap(parameters,pcnt,user);
4436                         return 1;
4437                 }
4438                 else if ((command == "TIME") && (pcnt > 0))
4439                 {
4440                         return this->HandleTime(parameters,pcnt,user);
4441                 }
4442                 else if (command == "LUSERS")
4443                 {
4444                         this->HandleLusers(parameters,pcnt,user);
4445                         return 1;
4446                 }
4447                 else if (command == "LINKS")
4448                 {
4449                         this->HandleLinks(parameters,pcnt,user);
4450                         return 1;
4451                 }
4452                 else if (command == "WHOIS")
4453                 {
4454                         if (pcnt > 1)
4455                         {
4456                                 // remote whois
4457                                 return this->HandleRemoteWhois(parameters,pcnt,user);
4458                         }
4459                 }
4460                 else if ((command == "VERSION") && (pcnt > 0))
4461                 {
4462                         this->HandleVersion(parameters,pcnt,user);
4463                         return 1;
4464                 }
4465
4466                 return 0;
4467         }
4468
4469         virtual void OnPostCommand(const std::string &command, const char** parameters, int pcnt, userrec *user, CmdResult result, const std::string &original_line)
4470         {
4471                 if ((result == CMD_SUCCESS) && (ServerInstance->IsValidModuleCommand(command, pcnt, user)))
4472                 {
4473                         // this bit of code cleverly routes all module commands
4474                         // to all remote severs *automatically* so that modules
4475                         // can just handle commands locally, without having
4476                         // to have any special provision in place for remote
4477                         // commands and linking protocols.
4478                         std::deque<std::string> params;
4479                         params.clear();
4480                         for (int j = 0; j < pcnt; j++)
4481                         {
4482                                 if (strchr(parameters[j],' '))
4483                                 {
4484                                         params.push_back(":" + std::string(parameters[j]));
4485                                 }
4486                                 else
4487                                 {
4488                                         params.push_back(std::string(parameters[j]));
4489                                 }
4490                         }
4491                         ServerInstance->Log(DEBUG,"Globally route '%s'",command.c_str());
4492                         Utils->DoOneToMany(user->nick,command,params);
4493                 }
4494         }
4495
4496         virtual void OnGetServerDescription(const std::string &servername,std::string &description)
4497         {
4498                 TreeServer* s = Utils->FindServer(servername);
4499                 if (s)
4500                 {
4501                         description = s->GetDesc();
4502                 }
4503         }
4504
4505         virtual void OnUserInvite(userrec* source,userrec* dest,chanrec* channel)
4506         {
4507                 if (IS_LOCAL(source))
4508                 {
4509                         std::deque<std::string> params;
4510                         params.push_back(dest->nick);
4511                         params.push_back(channel->name);
4512                         Utils->DoOneToMany(source->nick,"INVITE",params);
4513                 }
4514         }
4515
4516         virtual void OnPostLocalTopicChange(userrec* user, chanrec* chan, const std::string &topic)
4517         {
4518                 std::deque<std::string> params;
4519                 params.push_back(chan->name);
4520                 params.push_back(":"+topic);
4521                 Utils->DoOneToMany(user->nick,"TOPIC",params);
4522         }
4523
4524         virtual void OnWallops(userrec* user, const std::string &text)
4525         {
4526                 if (IS_LOCAL(user))
4527                 {
4528                         std::deque<std::string> params;
4529                         params.push_back(":"+text);
4530                         Utils->DoOneToMany(user->nick,"WALLOPS",params);
4531                 }
4532         }
4533
4534         virtual void OnUserNotice(userrec* user, void* dest, int target_type, const std::string &text, char status)
4535         {
4536                 if (target_type == TYPE_USER)
4537                 {
4538                         userrec* d = (userrec*)dest;
4539                         if ((d->GetFd() < 0) && (IS_LOCAL(user)))
4540                         {
4541                                 std::deque<std::string> params;
4542                                 params.clear();
4543                                 params.push_back(d->nick);
4544                                 params.push_back(":"+text);
4545                                 Utils->DoOneToOne(user->nick,"NOTICE",params,d->server);
4546                         }
4547                 }
4548                 else if (target_type == TYPE_CHANNEL)
4549                 {
4550                         if (IS_LOCAL(user))
4551                         {
4552                                 chanrec *c = (chanrec*)dest;
4553                                 if (c)
4554                                 {
4555                                         std::string cname = c->name;
4556                                         if (status)
4557                                                 cname = status + cname;
4558                                         std::deque<TreeServer*> list;
4559                                         Utils->GetListOfServersForChannel(c,list);
4560                                         unsigned int ucount = list.size();
4561                                         for (unsigned int i = 0; i < ucount; i++)
4562                                         {
4563                                                 TreeSocket* Sock = list[i]->GetSocket();
4564                                                 if (Sock)
4565                                                         Sock->WriteLine(":"+std::string(user->nick)+" NOTICE "+cname+" :"+text);
4566                                         }
4567                                 }
4568                         }
4569                 }
4570                 else if (target_type == TYPE_SERVER)
4571                 {
4572                         if (IS_LOCAL(user))
4573                         {
4574                                 char* target = (char*)dest;
4575                                 std::deque<std::string> par;
4576                                 par.push_back(target);
4577                                 par.push_back(":"+text);
4578                                 Utils->DoOneToMany(user->nick,"NOTICE",par);
4579                         }
4580                 }
4581         }
4582
4583         virtual void OnUserMessage(userrec* user, void* dest, int target_type, const std::string &text, char status)
4584         {
4585                 if (target_type == TYPE_USER)
4586                 {
4587                         // route private messages which are targetted at clients only to the server
4588                         // which needs to receive them
4589                         userrec* d = (userrec*)dest;
4590                         if ((d->GetFd() < 0) && (IS_LOCAL(user)))
4591                         {
4592                                 std::deque<std::string> params;
4593                                 params.clear();
4594                                 params.push_back(d->nick);
4595                                 params.push_back(":"+text);
4596                                 Utils->DoOneToOne(user->nick,"PRIVMSG",params,d->server);
4597                         }
4598                 }
4599                 else if (target_type == TYPE_CHANNEL)
4600                 {
4601                         if (IS_LOCAL(user))
4602                         {
4603                                 chanrec *c = (chanrec*)dest;
4604                                 if (c)
4605                                 {
4606                                         std::string cname = c->name;
4607                                         if (status)
4608                                                 cname = status + cname;
4609                                         std::deque<TreeServer*> list;
4610                                         Utils->GetListOfServersForChannel(c,list);
4611                                         unsigned int ucount = list.size();
4612                                         for (unsigned int i = 0; i < ucount; i++)
4613                                         {
4614                                                 TreeSocket* Sock = list[i]->GetSocket();
4615                                                 if (Sock)
4616                                                         Sock->WriteLine(":"+std::string(user->nick)+" PRIVMSG "+cname+" :"+text);
4617                                         }
4618                                 }
4619                         }
4620                 }
4621                 else if (target_type == TYPE_SERVER)
4622                 {
4623                         if (IS_LOCAL(user))
4624                         {
4625                                 char* target = (char*)dest;
4626                                 std::deque<std::string> par;
4627                                 par.push_back(target);
4628                                 par.push_back(":"+text);
4629                                 Utils->DoOneToMany(user->nick,"PRIVMSG",par);
4630                         }
4631                 }
4632         }
4633
4634         virtual void OnBackgroundTimer(time_t curtime)
4635         {
4636                 AutoConnectServers(curtime);
4637                 DoPingChecks(curtime);
4638         }
4639
4640         virtual void OnUserJoin(userrec* user, chanrec* channel)
4641         {
4642                 // Only do this for local users
4643                 if (IS_LOCAL(user))
4644                 {
4645                         std::deque<std::string> params;
4646                         params.clear();
4647                         params.push_back(channel->name);
4648                         // set up their permissions and the channel TS with FJOIN.
4649                         // All users are FJOINed now, because a module may specify
4650                         // new joining permissions for the user.
4651                         params.clear();
4652                         params.push_back(channel->name);
4653                         params.push_back(ConvToStr(channel->age));
4654                         params.push_back(std::string(channel->GetAllPrefixChars(user))+","+std::string(user->nick));
4655                         Utils->DoOneToMany(ServerInstance->Config->ServerName,"FJOIN",params);
4656                 }
4657         }
4658
4659         virtual void OnChangeHost(userrec* user, const std::string &newhost)
4660         {
4661                 // only occurs for local clients
4662                 if (user->registered != REG_ALL)
4663                         return;
4664                 std::deque<std::string> params;
4665                 params.push_back(newhost);
4666                 Utils->DoOneToMany(user->nick,"FHOST",params);
4667         }
4668
4669         virtual void OnChangeName(userrec* user, const std::string &gecos)
4670         {
4671                 // only occurs for local clients
4672                 if (user->registered != REG_ALL)
4673                         return;
4674                 std::deque<std::string> params;
4675                 params.push_back(gecos);
4676                 Utils->DoOneToMany(user->nick,"FNAME",params);
4677         }
4678
4679         virtual void OnUserPart(userrec* user, chanrec* channel, const std::string &partmessage)
4680         {
4681                 if (IS_LOCAL(user))
4682                 {
4683                         std::deque<std::string> params;
4684                         params.push_back(channel->name);
4685                         if (partmessage != "")
4686                                 params.push_back(":"+partmessage);
4687                         Utils->DoOneToMany(user->nick,"PART",params);
4688                 }
4689         }
4690
4691         virtual void OnUserConnect(userrec* user)
4692         {
4693                 char agestr[MAXBUF];
4694                 if (IS_LOCAL(user))
4695                 {
4696                         std::deque<std::string> params;
4697                         snprintf(agestr,MAXBUF,"%lu",(unsigned long)user->age);
4698                         params.push_back(agestr);
4699                         params.push_back(user->nick);
4700                         params.push_back(user->host);
4701                         params.push_back(user->dhost);
4702                         params.push_back(user->ident);
4703                         params.push_back("+"+std::string(user->FormatModes()));
4704                         params.push_back(user->GetIPString());
4705                         params.push_back(":"+std::string(user->fullname));
4706                         Utils->DoOneToMany(ServerInstance->Config->ServerName,"NICK",params);
4707
4708                         // User is Local, change needs to be reflected!
4709                         TreeServer* SourceServer = Utils->FindServer(user->server);
4710                         if (SourceServer)
4711                         {
4712                                 SourceServer->AddUserCount();
4713                         }
4714
4715                 }
4716         }
4717
4718         virtual void OnUserQuit(userrec* user, const std::string &reason)
4719         {
4720                 if ((IS_LOCAL(user)) && (user->registered == REG_ALL))
4721                 {
4722                         std::deque<std::string> params;
4723                         params.push_back(":"+reason);
4724                         Utils->DoOneToMany(user->nick,"QUIT",params);
4725                 }
4726                 // Regardless, We need to modify the user Counts..
4727                 TreeServer* SourceServer = Utils->FindServer(user->server);
4728                 if (SourceServer)
4729                 {
4730                         SourceServer->DelUserCount();
4731                 }
4732
4733         }
4734
4735         virtual void OnUserPostNick(userrec* user, const std::string &oldnick)
4736         {
4737                 if (IS_LOCAL(user))
4738                 {
4739                         std::deque<std::string> params;
4740                         params.push_back(user->nick);
4741                         Utils->DoOneToMany(oldnick,"NICK",params);
4742                 }
4743         }
4744
4745         virtual void OnUserKick(userrec* source, userrec* user, chanrec* chan, const std::string &reason)
4746         {
4747                 if ((source) && (IS_LOCAL(source)))
4748                 {
4749                         std::deque<std::string> params;
4750                         params.push_back(chan->name);
4751                         params.push_back(user->nick);
4752                         params.push_back(":"+reason);
4753                         Utils->DoOneToMany(source->nick,"KICK",params);
4754                 }
4755                 else if (!source)
4756                 {
4757                         std::deque<std::string> params;
4758                         params.push_back(chan->name);
4759                         params.push_back(user->nick);
4760                         params.push_back(":"+reason);
4761                         Utils->DoOneToMany(ServerInstance->Config->ServerName,"KICK",params);
4762                 }
4763         }
4764
4765         virtual void OnRemoteKill(userrec* source, userrec* dest, const std::string &reason)
4766         {
4767                 std::deque<std::string> params;
4768                 params.push_back(dest->nick);
4769                 params.push_back(":"+reason);
4770                 Utils->DoOneToMany(source->nick,"KILL",params);
4771         }
4772
4773         virtual void OnRehash(const std::string &parameter)
4774         {
4775                 if (parameter != "")
4776                 {
4777                         std::deque<std::string> params;
4778                         params.push_back(parameter);
4779                         Utils->DoOneToMany(ServerInstance->Config->ServerName,"REHASH",params);
4780                         // check for self
4781                         if (ServerInstance->MatchText(ServerInstance->Config->ServerName,parameter))
4782                         {
4783                                 ServerInstance->WriteOpers("*** Remote rehash initiated from server \002%s\002",ServerInstance->Config->ServerName);
4784                                 ServerInstance->RehashServer();
4785                         }
4786                 }
4787                 Utils->ReadConfiguration(false);
4788         }
4789
4790         // note: the protocol does not allow direct umode +o except
4791         // via NICK with 8 params. sending OPERTYPE infers +o modechange
4792         // locally.
4793         virtual void OnOper(userrec* user, const std::string &opertype)
4794         {
4795                 if (IS_LOCAL(user))
4796                 {
4797                         std::deque<std::string> params;
4798                         params.push_back(opertype);
4799                         Utils->DoOneToMany(user->nick,"OPERTYPE",params);
4800                 }
4801         }
4802
4803         void OnLine(userrec* source, const std::string &host, bool adding, char linetype, long duration, const std::string &reason)
4804         {
4805                 if (IS_LOCAL(source))
4806                 {
4807                         char type[8];
4808                         snprintf(type,8,"%cLINE",linetype);
4809                         std::string stype = type;
4810                         if (adding)
4811                         {
4812                                 char sduration[MAXBUF];
4813                                 snprintf(sduration,MAXBUF,"%ld",duration);
4814                                 std::deque<std::string> params;
4815                                 params.push_back(host);
4816                                 params.push_back(sduration);
4817                                 params.push_back(":"+reason);
4818                                 Utils->DoOneToMany(source->nick,stype,params);
4819                         }
4820                         else
4821                         {
4822                                 std::deque<std::string> params;
4823                                 params.push_back(host);
4824                                 Utils->DoOneToMany(source->nick,stype,params);
4825                         }
4826                 }
4827         }
4828
4829         virtual void OnAddGLine(long duration, userrec* source, const std::string &reason, const std::string &hostmask)
4830         {
4831                 OnLine(source,hostmask,true,'G',duration,reason);
4832         }
4833
4834         virtual void OnAddZLine(long duration, userrec* source, const std::string &reason, const std::string &ipmask)
4835         {
4836                 OnLine(source,ipmask,true,'Z',duration,reason);
4837         }
4838
4839         virtual void OnAddQLine(long duration, userrec* source, const std::string &reason, const std::string &nickmask)
4840         {
4841                 OnLine(source,nickmask,true,'Q',duration,reason);
4842         }
4843
4844         virtual void OnAddELine(long duration, userrec* source, const std::string &reason, const std::string &hostmask)
4845         {
4846                 OnLine(source,hostmask,true,'E',duration,reason);
4847         }
4848
4849         virtual void OnDelGLine(userrec* source, const std::string &hostmask)
4850         {
4851                 OnLine(source,hostmask,false,'G',0,"");
4852         }
4853
4854         virtual void OnDelZLine(userrec* source, const std::string &ipmask)
4855         {
4856                 OnLine(source,ipmask,false,'Z',0,"");
4857         }
4858
4859         virtual void OnDelQLine(userrec* source, const std::string &nickmask)
4860         {
4861                 OnLine(source,nickmask,false,'Q',0,"");
4862         }
4863
4864         virtual void OnDelELine(userrec* source, const std::string &hostmask)
4865         {
4866                 OnLine(source,hostmask,false,'E',0,"");
4867         }
4868
4869         virtual void OnMode(userrec* user, void* dest, int target_type, const std::string &text)
4870         {
4871                 if ((IS_LOCAL(user)) && (user->registered == REG_ALL))
4872                 {
4873                         if (target_type == TYPE_USER)
4874                         {
4875                                 userrec* u = (userrec*)dest;
4876                                 std::deque<std::string> params;
4877                                 params.push_back(u->nick);
4878                                 params.push_back(text);
4879                                 Utils->DoOneToMany(user->nick,"MODE",params);
4880                         }
4881                         else
4882                         {
4883                                 chanrec* c = (chanrec*)dest;
4884                                 std::deque<std::string> params;
4885                                 params.push_back(c->name);
4886                                 params.push_back(text);
4887                                 Utils->DoOneToMany(user->nick,"MODE",params);
4888                         }
4889                 }
4890         }
4891
4892         virtual void OnSetAway(userrec* user)
4893         {
4894                 if (IS_LOCAL(user))
4895                 {
4896                         std::deque<std::string> params;
4897                         params.push_back(":"+std::string(user->awaymsg));
4898                         Utils->DoOneToMany(user->nick,"AWAY",params);
4899                 }
4900         }
4901
4902         virtual void OnCancelAway(userrec* user)
4903         {
4904                 if (IS_LOCAL(user))
4905                 {
4906                         std::deque<std::string> params;
4907                         params.clear();
4908                         Utils->DoOneToMany(user->nick,"AWAY",params);
4909                 }
4910         }
4911
4912         virtual void ProtoSendMode(void* opaque, int target_type, void* target, const std::string &modeline)
4913         {
4914                 TreeSocket* s = (TreeSocket*)opaque;
4915                 if (target)
4916                 {
4917                         if (target_type == TYPE_USER)
4918                         {
4919                                 userrec* u = (userrec*)target;
4920                                 s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" FMODE "+u->nick+" "+ConvToStr(u->age)+" "+modeline);
4921                         }
4922                         else
4923                         {
4924                                 chanrec* c = (chanrec*)target;
4925                                 s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age)+" "+modeline);
4926                         }
4927                 }
4928         }
4929
4930         virtual void ProtoSendMetaData(void* opaque, int target_type, void* target, const std::string &extname, const std::string &extdata)
4931         {
4932                 TreeSocket* s = (TreeSocket*)opaque;
4933                 if (target)
4934                 {
4935                         if (target_type == TYPE_USER)
4936                         {
4937                                 userrec* u = (userrec*)target;
4938                                 s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" METADATA "+u->nick+" "+extname+" :"+extdata);
4939                         }
4940                         else if (target_type == TYPE_OTHER)
4941                         {
4942                                 s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" METADATA * "+extname+" :"+extdata);
4943                         }
4944                         else if (target_type == TYPE_CHANNEL)
4945                         {
4946                                 chanrec* c = (chanrec*)target;
4947                                 s->WriteLine(std::string(":")+ServerInstance->Config->ServerName+" METADATA "+c->name+" "+extname+" :"+extdata);
4948                         }
4949                 }
4950         }
4951
4952         virtual void OnEvent(Event* event)
4953         {
4954                 std::deque<std::string>* params = (std::deque<std::string>*)event->GetData();
4955
4956                 if (event->GetEventID() == "send_metadata")
4957                 {
4958                         if (params->size() < 3)
4959                                 return;
4960                         (*params)[2] = ":" + (*params)[2];
4961                         Utils->DoOneToMany(ServerInstance->Config->ServerName,"METADATA",*params);
4962                 }
4963                 else if (event->GetEventID() == "send_topic")
4964                 {
4965                         if (params->size() < 2)
4966                                 return;
4967                         (*params)[1] = ":" + (*params)[1];
4968                         params->insert(params->begin() + 1,ServerInstance->Config->ServerName);
4969                         params->insert(params->begin() + 1,ConvToStr(ServerInstance->Time()));
4970                         Utils->DoOneToMany(ServerInstance->Config->ServerName,"FTOPIC",*params);
4971                 }
4972                 else if (event->GetEventID() == "send_mode")
4973                 {
4974                         if (params->size() < 2)
4975                                 return;
4976                         // Insert the TS value of the object, either userrec or chanrec
4977                         time_t ourTS = 0;
4978                         userrec* a = ServerInstance->FindNick((*params)[0]);
4979                         if (a)
4980                         {
4981                                 ourTS = a->age;
4982                         }
4983                         else
4984                         {
4985                                 chanrec* a = ServerInstance->FindChan((*params)[0]);
4986                                 if (a)
4987                                 {
4988                                         ourTS = a->age;
4989                                 }
4990                         }
4991                         params->insert(params->begin() + 1,ConvToStr(ourTS));
4992                         Utils->DoOneToMany(ServerInstance->Config->ServerName,"FMODE",*params);
4993                 }
4994         }
4995
4996         virtual ~ModuleSpanningTree()
4997         {
4998                 ServerInstance->Log(DEBUG,"Performing unload of spanningtree!");
4999                 /* This will also free the listeners */
5000                 delete Utils;
5001         }
5002
5003         virtual Version GetVersion()
5004         {
5005                 return Version(1,1,0,2,VF_VENDOR,API_VERSION);
5006         }
5007
5008         void Implements(char* List)
5009         {
5010                 List[I_OnPreCommand] = List[I_OnGetServerDescription] = List[I_OnUserInvite] = List[I_OnPostLocalTopicChange] = 1;
5011                 List[I_OnWallops] = List[I_OnUserNotice] = List[I_OnUserMessage] = List[I_OnBackgroundTimer] = 1;
5012                 List[I_OnUserJoin] = List[I_OnChangeHost] = List[I_OnChangeName] = List[I_OnUserPart] = List[I_OnUserConnect] = 1;
5013                 List[I_OnUserQuit] = List[I_OnUserPostNick] = List[I_OnUserKick] = List[I_OnRemoteKill] = List[I_OnRehash] = 1;
5014                 List[I_OnOper] = List[I_OnAddGLine] = List[I_OnAddZLine] = List[I_OnAddQLine] = List[I_OnAddELine] = 1;
5015                 List[I_OnDelGLine] = List[I_OnDelZLine] = List[I_OnDelQLine] = List[I_OnDelELine] = List[I_ProtoSendMode] = List[I_OnMode] = 1;
5016                 List[I_OnStats] = List[I_ProtoSendMetaData] = List[I_OnEvent] = List[I_OnSetAway] = List[I_OnCancelAway] = List[I_OnPostCommand] = 1;
5017         }
5018
5019         /* It is IMPORTANT that m_spanningtree is the last module in the chain
5020          * so that any activity it sees is FINAL, e.g. we arent going to send out
5021          * a NICK message before m_cloaking has finished putting the +x on the user,
5022          * etc etc.
5023          * Therefore, we return PRIORITY_LAST to make sure we end up at the END of
5024          * the module call queue.
5025          */
5026         Priority Prioritize()
5027         {
5028                 return PRIORITY_LAST;
5029         }
5030 };
5031
5032 void SpanningTreeUtilities::DoFailOver(Link* x)
5033 {
5034         if (x->FailOver.length())
5035         {
5036                 if (x->FailOver == x->Name)
5037                 {
5038                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Some muppet configured the failover for server \002%s\002 to point at itself. Not following it!", x->Name.c_str());
5039                         return;
5040                 }
5041                 Link* TryThisOne = this->FindLink(x->FailOver.c_str());
5042                 if (TryThisOne)
5043                 {
5044                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Trying failover link for \002%s\002: \002%s\002...", x->Name.c_str(), TryThisOne->Name.c_str());
5045                         Creator->ConnectServer(TryThisOne);
5046                 }
5047                 else
5048                 {
5049                         ServerInstance->SNO->WriteToSnoMask('l',"FAILOVER: Invalid failover server specified for server \002%s\002, will not follow!", x->Name.c_str());
5050                 }
5051         }
5052 }
5053
5054 Link* SpanningTreeUtilities::FindLink(const std::string& name)
5055 {
5056         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
5057         {
5058                 if (ServerInstance->MatchText(x->Name.c_str(), name.c_str()))
5059                 {
5060                         return &(*x);
5061                 }
5062         }
5063         return NULL;
5064 }
5065
5066
5067 class ModuleSpanningTreeFactory : public ModuleFactory
5068 {
5069  public:
5070         ModuleSpanningTreeFactory()
5071         {
5072         }
5073
5074         ~ModuleSpanningTreeFactory()
5075         {
5076         }
5077
5078         virtual Module * CreateModule(InspIRCd* Me)
5079         {
5080                 return new ModuleSpanningTree(Me);
5081         }
5082
5083 };
5084
5085
5086 extern "C" void * init_module( void )
5087 {
5088         return new ModuleSpanningTreeFactory;
5089 }