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