src/modules/m_spanningtree.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2005 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 using namespace std;
  18
  19 #include <stdio.h>
  20 #include <vector>
  21 #include <deque>
  22 #include "globals.h"
  23 #include "inspircd_config.h"
  24 #ifdef GCC3
  25 #include <ext/hash_map>
  26 #else
  27 #include <hash_map>
  28 #endif
  29 #include "users.h"
  30 #include "channels.h"
  31 #include "modules.h"
  32 #include "socket.h"
  33 #include "helperfuncs.h"
  34 #include "inspircd.h"
  35 #include "inspstring.h"
  36 #include "hashcomp.h"
  37 #include "message.h"
  38
  39 #ifdef GCC3
  40 #define nspace __gnu_cxx
  41 #else
  42 #define nspace std
  43 #endif
  44
  45 class ModuleSpanningTree;
  46 static ModuleSpanningTree* TreeProtocolModule;
  47
  48 extern std::vector<Module*> modules;
  49 extern std::vector<ircd_module*> factory;
  50 extern int MODCOUNT;
  51
  52 enum ServerState { LISTENER, CONNECTING, WAIT_AUTH_1, WAIT_AUTH_2, CONNECTED };
  53
  54 typedef nspace::hash_map<std::string, userrec*, nspace::hash<string>, irc::StrHashComp> user_hash;
  55 typedef nspace::hash_map<std::string, chanrec*, nspace::hash<string>, irc::StrHashComp> chan_hash;
  56
  57 extern user_hash clientlist;
  58 extern chan_hash chanlist;
  59
  60 class TreeServer;
  61 class TreeSocket;
  62
  63 bool DoOneToOne(std::string prefix, std::string command, std::deque<std::string> params, std::string target);
  64 bool DoOneToAllButSender(std::string prefix, std::string command, std::deque<std::string> params, std::string omit);
  65 bool DoOneToMany(std::string prefix, std::string command, std::deque<std::string> params);
  66 bool DoOneToAllButSenderRaw(std::string data,std::string omit);
  67 void ReadConfiguration(bool rebind);
  68
  69 class TreeServer
  70 {
  71         TreeServer* Parent;
  72         std::vector<TreeServer*> Children;
  73         std::string ServerName;
  74         std::string ServerDesc;
  75         std::string VersionString;
  76         int UserCount;
  77         int OperCount;
  78         TreeSocket* Socket;     // for directly connected servers this points at the socket object
  79
  80  public:
  81
  82         TreeServer()
  83         {
  84                 Parent = NULL;
  85                 ServerName = "";
  86                 ServerDesc = "";
  87                 VersionString = "";
  88                 UserCount = OperCount = 0;
  89         }
  90
  91         TreeServer(std::string Name, std::string Desc) : ServerName(Name), ServerDesc(Desc)
  92         {
  93                 Parent = NULL;
  94                 VersionString = "";
  95                 UserCount = OperCount = 0;
  96         }
  97
  98         TreeServer(std::string Name, std::string Desc, TreeServer* Above, TreeSocket* Sock) : Parent(Above), ServerName(Name), ServerDesc(Desc), Socket(Sock)
  99         {
 100                 VersionString = "";
 101                 UserCount = OperCount = 0;
 102         }
 103
 104         std::string GetName()
 105         {
 106                 return this->ServerName;
 107         }
 108
 109         std::string GetDesc()
 110         {
 111                 return this->ServerDesc;
 112         }
 113
 114         std::string GetVersion()
 115         {
 116                 return this->VersionString;
 117         }
 118
 119         int GetUserCount()
 120         {
 121                 return this->UserCount;
 122         }
 123
 124         int GetOperCount()
 125         {
 126                 return this->OperCount;
 127         }
 128
 129         TreeSocket* GetSocket()
 130         {
 131                 return this->Socket;
 132         }
 133
 134         TreeServer* GetParent()
 135         {
 136                 return this->Parent;
 137         }
 138
 139         unsigned int ChildCount()
 140         {
 141                 return Children.size();
 142         }
 143
 144         TreeServer* GetChild(unsigned int n)
 145         {
 146                 if (n < Children.size())
 147                 {
 148                         return Children[n];
 149                 }
 150                 else
 151                 {
 152                         return NULL;
 153                 }
 154         }
 155
 156         void AddChild(TreeServer* Child)
 157         {
 158                 Children.push_back(Child);
 159         }
 160
 161         bool DelChild(TreeServer* Child)
 162         {
 163                 for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
 164                 {
 165                         if (*a == Child)
 166                         {
 167                                 Children.erase(a);
 168                                 return true;
 169                         }
 170                 }
 171                 return false;
 172         }
 173
 174         // removes child nodes of this node, and of that node, etc etc
 175         bool Tidy()
 176         {
 177                 bool stillchildren = true;
 178                 while (stillchildren)
 179                 {
 180                         stillchildren = false;
 181                         for (std::vector<TreeServer*>::iterator a = Children.begin(); a < Children.end(); a++)
 182                         {
 183                                 TreeServer* s = (TreeServer*)*a;
 184                                 s->Tidy();
 185                                 Children.erase(a);
 186                                 delete s;
 187                                 stillchildren = true;
 188                                 break;
 189                         }
 190                 }
 191                 return true;
 192         }
 193 };
 194
 195 class Link
 196 {
 197  public:
 198          std::string Name;
 199          std::string IPAddr;
 200          int Port;
 201          std::string SendPass;
 202          std::string RecvPass;
 203 };
 204
 205 /* $ModDesc: Povides a spanning tree server link protocol */
 206
 207 Server *Srv;
 208 ConfigReader *Conf;
 209 TreeServer *TreeRoot;
 210 std::vector<Link> LinkBlocks;
 211
 212 TreeServer* RouteEnumerate(TreeServer* Current, std::string ServerName)
 213 {
 214         if (Current->GetName() == ServerName)
 215                 return Current;
 216         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 217         {
 218                 TreeServer* found = RouteEnumerate(Current->GetChild(q),ServerName);
 219                 if (found)
 220                 {
 221                         return found;
 222                 }
 223         }
 224         return NULL;
 225 }
 226
 227 // Returns the locally connected server we must route a
 228 // message through to reach server 'ServerName'. This
 229 // only applies to one-to-one and not one-to-many routing.
 230 TreeServer* BestRouteTo(std::string ServerName)
 231 {
 232         log(DEBUG,"Finding best route to %s",ServerName.c_str());
 233         if (ServerName.c_str() == TreeRoot->GetName())
 234         {
 235                 log(DEBUG,"Cant route to myself!!!");
 236                 return NULL;
 237         }
 238         // first, find the server by recursively walking the tree
 239         TreeServer* Found = RouteEnumerate(TreeRoot,ServerName);
 240         // did we find it? If not, they did something wrong, abort.
 241         if (!Found)
 242         {
 243                 log(DEBUG,"Failed to find %s by walking tree!",ServerName.c_str());
 244                 return NULL;
 245         }
 246         else
 247         {
 248                 // The server exists, follow its parent nodes until
 249                 // the parent of the current is 'TreeRoot', we know
 250                 // then that this is a directly-connected server.
 251                 while ((Found) && (Found->GetParent() != TreeRoot))
 252                 {
 253                         Found = Found->GetParent();
 254                 }
 255                 log(DEBUG,"Route to %s is via %s",ServerName.c_str(),Found->GetName().c_str());
 256                 return Found;
 257         }
 258 }
 259
 260 bool LookForServer(TreeServer* Current, std::string ServerName)
 261 {
 262         if (ServerName == Current->GetName())
 263                 return true;
 264         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 265         {
 266                 if (LookForServer(Current->GetChild(q),ServerName))
 267                         return true;
 268         }
 269         return false;
 270 }
 271
 272 TreeServer* Found;
 273
 274 void RFindServer(TreeServer* Current, std::string ServerName)
 275 {
 276         if ((ServerName == Current->GetName()) && (!Found))
 277         {
 278                 Found = Current;
 279                 log(DEBUG,"Found server %s desc %s",Current->GetName().c_str(),Current->GetDesc().c_str());
 280                 return;
 281         }
 282         if (!Found)
 283         {
 284                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
 285                 {
 286                         if (!Found)
 287                                 RFindServer(Current->GetChild(q),ServerName);
 288                 }
 289         }
 290         return;
 291 }
 292
 293 TreeServer* FindServer(std::string ServerName)
 294 {
 295         Found = NULL;
 296         RFindServer(TreeRoot,ServerName);
 297         return Found;
 298 }
 299
 300 bool IsServer(std::string ServerName)
 301 {
 302         return LookForServer(TreeRoot,ServerName);
 303 }
 304
 305 class TreeSocket : public InspSocket
 306 {
 307         std::string myhost;
 308         std::string in_buffer;
 309         ServerState LinkState;
 310         std::string InboundServerName;
 311         std::string InboundDescription;
 312         int num_lost_users;
 313         int num_lost_servers;
 314
 315  public:
 316
 317         TreeSocket(std::string host, int port, bool listening, unsigned long maxtime)
 318                 : InspSocket(host, port, listening, maxtime)
 319         {
 320                 Srv->Log(DEBUG,"Create new listening");
 321                 myhost = host;
 322                 this->LinkState = LISTENER;
 323         }
 324
 325         TreeSocket(std::string host, int port, bool listening, unsigned long maxtime, std::string ServerName)
 326                 : InspSocket(host, port, listening, maxtime)
 327         {
 328                 Srv->Log(DEBUG,"Create new outbound");
 329                 myhost = ServerName;
 330                 this->LinkState = CONNECTING;
 331         }
 332
 333         TreeSocket(int newfd, char* ip)
 334                 : InspSocket(newfd, ip)
 335         {
 336                 Srv->Log(DEBUG,"Associate new inbound");
 337                 this->LinkState = WAIT_AUTH_1;
 338         }
 339
 340         virtual bool OnConnected()
 341         {
 342                 if (this->LinkState == CONNECTING)
 343                 {
 344                         Srv->SendOpers("*** Connection to "+myhost+"["+this->GetIP()+"] established.");
 345                         // we should send our details here.
 346                         // if the other side is satisfied, they send theirs.
 347                         // we do not need to change state here.
 348                         for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 349                         {
 350                                 if (x->Name == this->myhost)
 351                                 {
 352                                         // found who we're supposed to be connecting to, send the neccessary gubbins.
 353                                         this->WriteLine("SERVER "+Srv->GetServerName()+" "+x->SendPass+" 0 :"+Srv->GetServerDescription());
 354                                         return true;
 355                                 }
 356                         }
 357                 }
 358                 log(DEBUG,"Outbound connection ERROR: Could not find the right link block!");
 359                 return true;
 360         }
 361
 362         virtual void OnError(InspSocketError e)
 363         {
 364         }
 365
 366         virtual int OnDisconnect()
 367         {
 368                 return true;
 369         }
 370
 371         // recursively send the server tree with distances as hops
 372         void SendServers(TreeServer* Current, TreeServer* s, int hops)
 373         {
 374                 char command[1024];
 375                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
 376                 {
 377                         TreeServer* recursive_server = Current->GetChild(q);
 378                         if (recursive_server != s)
 379                         {
 380                                 // :source.server SERVER server.name hops :Description
 381                                 snprintf(command,1024,":%s SERVER %s * %d :%s",Current->GetName().c_str(),recursive_server->GetName().c_str(),hops,recursive_server->GetDesc().c_str());
 382                                 this->WriteLine(command);
 383                                 // down to next level
 384                                 this->SendServers(recursive_server, s, hops+1);
 385                         }
 386                 }
 387         }
 388
 389         void SquitServer(TreeServer* Current)
 390         {
 391                 // recursively squit the servers attached to 'Current'
 392                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
 393                 {
 394                         TreeServer* recursive_server = Current->GetChild(q);
 395                         this->SquitServer(recursive_server);
 396                 }
 397                 // Now we've whacked the kids, whack self
 398                 log(DEBUG,"Deleted %s",Current->GetName().c_str());
 399                 num_lost_servers++;
 400                 bool quittingpeople = true;
 401                 while (quittingpeople)
 402                 {
 403                         quittingpeople = false;
 404                         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 405                         {
 406                                 if (!strcasecmp(u->second->server,Current->GetName().c_str()))
 407                                 {
 408                                         log(DEBUG,"Quitting user %s of server %s",u->second->nick,u->second->server);
 409                                         Srv->QuitUser(u->second,Current->GetName()+" "+std::string(Srv->GetServerName()));
 410                                         num_lost_users++;
 411                                         quittingpeople = true;
 412                                         break;
 413                                 }
 414                         }
 415                 }
 416         }
 417
 418         void Squit(TreeServer* Current,std::string reason)
 419         {
 420                 if (Current)
 421                 {
 422                         std::deque<std::string> params;
 423                         params.push_back(Current->GetName());
 424                         params.push_back(":"+reason);
 425                         DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 426                         if (Current->GetParent() == TreeRoot)
 427                         {
 428                                 Srv->SendOpers("Server \002"+Current->GetName()+"\002 split: "+reason);
 429                         }
 430                         else
 431                         {
 432                                 Srv->SendOpers("Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 433                         }
 434                         num_lost_servers = 0;
 435                         num_lost_users = 0;
 436                         SquitServer(Current);
 437                         Current->Tidy();
 438                         Current->GetParent()->DelChild(Current);
 439                         delete Current;
 440                         WriteOpers("Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 441                 }
 442                 else
 443                 {
 444                         log(DEBUG,"Squit from unknown server");
 445                 }
 446         }
 447
 448         bool ForceMode(std::string source, std::deque<std::string> params)
 449         {
 450                 userrec* who = new userrec;
 451                 who->fd = FD_MAGIC_NUMBER;
 452                 if (params.size() < 2)
 453                         return true;
 454                 char* modelist[255];
 455                 for (unsigned int q = 0; q < params.size(); q++)
 456                 {
 457                         modelist[q] = (char*)params[q].c_str();
 458                 }
 459                 Srv->SendMode(modelist,params.size(),who);
 460                 DoOneToAllButSender(source,"FMODE",params,source);
 461                 delete who;
 462                 return true;
 463         }
 464
 465         bool ForceTopic(std::string source, std::deque<std::string> params)
 466         {
 467                 // FTOPIC %s %lu %s :%s
 468                 if (params.size() != 4)
 469                         return true;
 470                 std::string channel = params[0];
 471                 time_t ts = atoi(params[1].c_str());
 472                 std::string setby = params[2];
 473                 std::string topic = params[3];
 474
 475                 chanrec* c = Srv->FindChannel(channel);
 476                 if (c)
 477                 {
 478                         if ((ts >= c->topicset) || (!*c->topic))
 479                         {
 480                                 strlcpy(c->topic,topic.c_str(),MAXTOPIC);
 481                                 strlcpy(c->setby,setby.c_str(),NICKMAX);
 482                                 c->topicset = ts;
 483                                 WriteChannelWithServ((char*)source.c_str(), c, "TOPIC %s :%s", c->name, c->topic);
 484                         }
 485
 486                 }
 487
 488                 // all done, send it on its way
 489                 params[3] = ":" + params[3];
 490                 DoOneToAllButSender(source,"FTOPIC",params,source);
 491
 492                 return true;
 493         }
 494
 495         bool ForceJoin(std::string source, std::deque<std::string> params)
 496         {
 497                 if (params.size() < 2)
 498                         return true;
 499
 500                 char first[MAXBUF];
 501                 char modestring[MAXBUF];
 502                 char* mode_users[127];
 503                 mode_users[0] = first;
 504                 mode_users[1] = modestring;
 505                 strcpy(mode_users[1],"+");
 506                 unsigned int modectr = 2;
 507
 508                 std::string channel = params[0];
 509                 char* key = "";
 510                 chanrec* chan = Srv->FindChannel(channel);
 511                 if (chan)
 512                 {
 513                         key = chan->key;
 514                 }
 515                 strlcpy(mode_users[0],channel.c_str(),MAXBUF);
 516                 for (unsigned int usernum = 1; usernum < params.size(); usernum++)
 517                 {
 518                         // process one channel at a time, applying modes.
 519                         char* usr = (char*)params[usernum].c_str();
 520                         char permissions = *usr;
 521                         userrec* who = Srv->FindNick(usr);
 522                         if (who)
 523                         {
 524                                 switch (permissions)
 525                                 {
 526                                         case '@':
 527                                                 usr++;
 528                                                 mode_users[modectr++] = usr;
 529                                                 strlcat(modestring,"o",MAXBUF);
 530                                         break;
 531                                         case '%':
 532                                                 usr++;
 533                                                 mode_users[modectr++] = usr;
 534                                                 strlcat(modestring,"h",MAXBUF);
 535                                         break;
 536                                         case '+':
 537                                                 usr++;
 538                                                 mode_users[modectr++] = usr;
 539                                                 strlcat(modestring,"v",MAXBUF);
 540                                         break;
 541                                 }
 542                                 Srv->JoinUserToChannel(who,channel,key);
 543                                 if (modectr >= (MAXMODES-1))
 544                                 {
 545                                         // theres a mode for this user. push them onto the mode queue, and flush it
 546                                         // if there are more than MAXMODES to go.
 547                                         Srv->SendMode(mode_users,modectr,who);
 548                                         strcpy(mode_users[1],"+");
 549                                         modectr = 2;
 550                                 }
 551                         }
 552                 }
 553                 // there werent enough modes built up to flush it during FJOIN,
 554                 // or, there are a number left over. flush them out.
 555                 if (modectr > 2)
 556                 {
 557                         userrec* who = new userrec;
 558                         who->fd = FD_MAGIC_NUMBER;
 559                         Srv->SendMode(mode_users,modectr,who);
 560                         delete who;
 561                 }
 562                 DoOneToAllButSender(source,"FJOIN",params,source);
 563                 return true;
 564         }
 565
 566         bool IntroduceClient(std::string source, std::deque<std::string> params)
 567         {
 568                 if (params.size() < 8)
 569                         return true;
 570                 // NICK age nick host dhost ident +modes ip :gecos
 571                 //       0   1    2    3      4     5    6   7
 572                 std::string nick = params[1];
 573                 std::string host = params[2];
 574                 std::string dhost = params[3];
 575                 std::string ident = params[4];
 576                 time_t age = atoi(params[0].c_str());
 577                 std::string modes = params[5];
 578                 if (*(modes.c_str()) == '+')
 579                 {
 580                         char* m = (char*)modes.c_str();
 581                         m++;
 582                         modes = m;
 583                 }
 584                 std::string ip = params[6];
 585                 std::string gecos = params[7];
 586                 char* tempnick = (char*)nick.c_str();
 587                 log(DEBUG,"Introduce client %s!%s@%s",tempnick,ident.c_str(),host.c_str());
 588
 589                 user_hash::iterator iter;
 590                 iter = clientlist.find(tempnick);
 591                 if (iter != clientlist.end())
 592                 {
 593                         // nick collision
 594                         log(DEBUG,"Nick collision on %s!%s@%s: %lu %lu",tempnick,ident.c_str(),host.c_str(),(unsigned long)age,(unsigned long)iter->second->age);
 595                         this->WriteLine(":"+Srv->GetServerName()+" KILL "+tempnick+" :Nickname collision");
 596                         return true;
 597                 }
 598
 599                 clientlist[tempnick] = new userrec();
 600                 clientlist[tempnick]->fd = FD_MAGIC_NUMBER;
 601                 strlcpy(clientlist[tempnick]->nick, tempnick,NICKMAX);
 602                 strlcpy(clientlist[tempnick]->host, host.c_str(),160);
 603                 strlcpy(clientlist[tempnick]->dhost, dhost.c_str(),160);
 604                 clientlist[tempnick]->server = (char*)FindServerNamePtr(source.c_str());
 605                 strlcpy(clientlist[tempnick]->ident, ident.c_str(),IDENTMAX);
 606                 strlcpy(clientlist[tempnick]->fullname, gecos.c_str(),MAXGECOS);
 607                 clientlist[tempnick]->registered = 7;
 608                 clientlist[tempnick]->signon = age;
 609                 strlcpy(clientlist[tempnick]->ip,ip.c_str(),16);
 610                 for (int i = 0; i < MAXCHANS; i++)
 611                 {
 612                         clientlist[tempnick]->chans[i].channel = NULL;
 613                         clientlist[tempnick]->chans[i].uc_modes = 0;
 614                 }
 615                 params[7] = ":" + params[7];
 616                 DoOneToAllButSender(source,"NICK",params,source);
 617                 return true;
 618         }
 619
 620         void SendFJoins(TreeServer* Current, chanrec* c)
 621         {
 622                 char list[MAXBUF];
 623                 snprintf(list,MAXBUF,":%s FJOIN %s ",Srv->GetServerName().c_str(),c->name);
 624                 std::vector<char*> *ulist = c->GetUsers();
 625                 for (unsigned int i = 0; i < ulist->size(); i++)
 626                 {
 627                         char* o = (*ulist)[i];
 628                         userrec* otheruser = (userrec*)o;
 629                         strlcat(list,cmode(otheruser,c),MAXBUF);
 630                         strlcat(list,otheruser->nick,MAXBUF);
 631                         strlcat(list," ",MAXBUF);
 632                         if (strlen(list)>(480-NICKMAX))
 633                         {
 634                                 this->WriteLine(list);
 635                                 snprintf(list,MAXBUF,":%s FJOIN %s ",Srv->GetServerName().c_str(),c->name);
 636                         }
 637                 }
 638                 if (list[strlen(list)-1] != ':')
 639                 {
 640                         this->WriteLine(list);
 641                 }
 642         }
 643
 644         void SendChannelModes(TreeServer* Current)
 645         {
 646                 char data[MAXBUF];
 647                 for (chan_hash::iterator c = chanlist.begin(); c != chanlist.end(); c++)
 648                 {
 649                         SendFJoins(Current, c->second);
 650                         snprintf(data,MAXBUF,":%s FMODE %s +%s",Srv->GetServerName().c_str(),c->second->name,chanmodes(c->second));
 651                         this->WriteLine(data);
 652                         if (*c->second->topic)
 653                         {
 654                                 snprintf(data,MAXBUF,":%s FTOPIC %s %lu %s :%s",Srv->GetServerName().c_str(),c->second->name,(unsigned long)c->second->topicset,c->second->setby,c->second->topic);
 655                                 this->WriteLine(data);
 656                         }
 657                         for (BanList::iterator b = c->second->bans.begin(); b != c->second->bans.end(); b++)
 658                         {
 659                                 snprintf(data,MAXBUF,":%s FMODE %s +b %s",Srv->GetServerName().c_str(),c->second->name,b->data);
 660                                 this->WriteLine(data);
 661                         }
 662                         FOREACH_MOD OnSyncChannel(c->second,(Module*)TreeProtocolModule,(void*)this);
 663                 }
 664         }
 665
 666         // send all users and their channels
 667         void SendUsers(TreeServer* Current)
 668         {
 669                 char data[MAXBUF];
 670                 for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 671                 {
 672                         if (u->second->registered == 7)
 673                         {
 674                                 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->modes,u->second->ip,u->second->fullname);
 675                                 this->WriteLine(data);
 676                                 if (strchr(u->second->modes,'o'))
 677                                 {
 678                                         this->WriteLine(":"+std::string(u->second->nick)+" OPERTYPE "+std::string(u->second->oper));
 679                                 }
 680                                 //char* chl = chlist(u->second,u->second);
 681                                 //if (*chl)
 682                                 //{
 683                                 //      this->WriteLine(":"+std::string(u->second->nick)+" FJOIN "+std::string(chl));
 684                                 //}
 685                                 FOREACH_MOD OnSyncUser(u->second,(Module*)TreeProtocolModule,(void*)this);
 686                         }
 687                 }
 688         }
 689
 690         void DoBurst(TreeServer* s)
 691         {
 692                 log(DEBUG,"Beginning network burst");
 693                 Srv->SendOpers("*** Bursting to "+s->GetName()+".");
 694                 this->WriteLine("BURST");
 695                 // Send server tree
 696                 this->SendServers(TreeRoot,s,1);
 697                 // Send users and their channels
 698                 this->SendUsers(s);
 699                 // TODO: Send everything else (channel modes etc)
 700                 this->SendChannelModes(s);
 701                 this->WriteLine("ENDBURST");
 702         }
 703
 704         virtual bool OnDataReady()
 705         {
 706                 char* data = this->Read();
 707                 if (data)
 708                 {
 709                         this->in_buffer += data;
 710                         while (in_buffer.find("\n") != std::string::npos)
 711                         {
 712                                 char* line = (char*)in_buffer.c_str();
 713                                 std::string ret = "";
 714                                 while ((*line != '\n') && (strlen(line)))
 715                                 {
 716                                         ret = ret + *line;
 717                                         line++;
 718                                 }
 719                                 if ((*line == '\n') || (*line == '\r'))
 720                                         line++;
 721                                 in_buffer = line;
 722                                 if (!this->ProcessLine(ret))
 723                                 {
 724                                         return false;
 725                                 }
 726                         }
 727                 }
 728                 return (data != NULL);
 729         }
 730
 731         int WriteLine(std::string line)
 732         {
 733                 return this->Write(line + "\r\n");
 734         }
 735
 736         bool Error(std::deque<std::string> params)
 737         {
 738                 if (params.size() < 1)
 739                         return false;
 740                 std::string Errmsg = params[0];
 741                 std::string SName = myhost;
 742                 if (InboundServerName != "")
 743                 {
 744                         SName = InboundServerName;
 745                 }
 746                 Srv->SendOpers("*** ERROR from "+SName+": "+Errmsg);
 747                 // we will return false to cause the socket to close.
 748                 return false;
 749         }
 750
 751         bool OperType(std::string prefix, std::deque<std::string> params)
 752         {
 753                 if (params.size() != 1)
 754                         return true;
 755                 std::string opertype = params[0];
 756                 userrec* u = Srv->FindNick(prefix);
 757                 if (u)
 758                 {
 759                         strlcpy(u->oper,opertype.c_str(),NICKMAX);
 760                         if (!strchr(u->modes,'o'))
 761                         {
 762                                 strcat(u->modes,"o");
 763                         }
 764                         DoOneToAllButSender(u->server,"OPERTYPE",params,u->server);
 765                 }
 766                 return true;
 767         }
 768
 769         bool RemoteRehash(std::string prefix, std::deque<std::string> params)
 770         {
 771                 if (params.size() < 1)
 772                         return true;
 773                 std::string servermask = params[0];
 774                 if (Srv->MatchText(Srv->GetServerName(),servermask))
 775                 {
 776                         Srv->SendOpers("*** Remote rehash initiated from server \002"+prefix+"\002.");
 777                         Srv->RehashServer();
 778                         ReadConfiguration(false);
 779                 }
 780                 DoOneToAllButSender(prefix,"REHASH",params,prefix);
 781                 return true;
 782         }
 783
 784         bool RemoteKill(std::string prefix, std::deque<std::string> params)
 785         {
 786                 if (params.size() != 2)
 787                         return true;
 788                 std::string nick = params[0];
 789                 std::string reason = params[1];
 790                 userrec* u = Srv->FindNick(prefix);
 791                 userrec* who = Srv->FindNick(nick);
 792                 if (who)
 793                 {
 794                         std::string sourceserv = prefix;
 795                         if (u)
 796                         {
 797                                 sourceserv = u->server;
 798                         }
 799                         params[1] = ":" + params[1];
 800                         DoOneToAllButSender(prefix,"KILL",params,sourceserv);
 801                         Srv->QuitUser(who,reason);
 802                 }
 803                 return true;
 804         }
 805
 806         bool RemoteServer(std::string prefix, std::deque<std::string> params)
 807         {
 808                 if (params.size() < 4)
 809                         return false;
 810                 std::string servername = params[0];
 811                 std::string password = params[1];
 812                 // hopcount is not used for a remote server, we calculate this ourselves
 813                 std::string description = params[3];
 814                 TreeServer* ParentOfThis = FindServer(prefix);
 815                 if (!ParentOfThis)
 816                 {
 817                         this->WriteLine("ERROR :Protocol error - Introduced remote server from unknown server "+prefix);
 818                         return false;
 819                 }
 820                 TreeServer* Node = new TreeServer(servername,description,ParentOfThis,NULL);
 821                 ParentOfThis->AddChild(Node);
 822                 params[3] = ":" + params[3];
 823                 DoOneToAllButSender(prefix,"SERVER",params,prefix);
 824                 Srv->SendOpers("*** Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
 825                 return true;
 826         }
 827
 828         bool Outbound_Reply_Server(std::deque<std::string> params)
 829         {
 830                 if (params.size() < 4)
 831                         return false;
 832                 std::string servername = params[0];
 833                 std::string password = params[1];
 834                 int hops = atoi(params[2].c_str());
 835                 if (hops)
 836                 {
 837                         this->WriteLine("ERROR :Server too far away for authentication");
 838                         return false;
 839                 }
 840                 std::string description = params[3];
 841                 for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 842                 {
 843                         if ((x->Name == servername) && (x->RecvPass == password))
 844                         {
 845                                 // Begin the sync here. this kickstarts the
 846                                 // other side, waiting in WAIT_AUTH_2 state,
 847                                 // into starting their burst, as it shows
 848                                 // that we're happy.
 849                                 this->LinkState = CONNECTED;
 850                                 // we should add the details of this server now
 851                                 // to the servers tree, as a child of the root
 852                                 // node.
 853                                 TreeServer* Node = new TreeServer(servername,description,TreeRoot,this);
 854                                 TreeRoot->AddChild(Node);
 855                                 params[3] = ":" + params[3];
 856                                 DoOneToAllButSender(TreeRoot->GetName(),"SERVER",params,servername);
 857                                 this->DoBurst(Node);
 858                                 return true;
 859                         }
 860                 }
 861                 this->WriteLine("ERROR :Invalid credentials");
 862                 return false;
 863         }
 864
 865         bool Inbound_Server(std::deque<std::string> params)
 866         {
 867                 if (params.size() < 4)
 868                         return false;
 869                 std::string servername = params[0];
 870                 std::string password = params[1];
 871                 int hops = atoi(params[2].c_str());
 872                 if (hops)
 873                 {
 874                         this->WriteLine("ERROR :Server too far away for authentication");
 875                         return false;
 876                 }
 877                 std::string description = params[3];
 878                 for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 879                 {
 880                         if ((x->Name == servername) && (x->RecvPass == password))
 881                         {
 882                                 Srv->SendOpers("*** Verified incoming server connection from \002"+servername+"\002["+this->GetIP()+"] ("+description+")");
 883                                 this->InboundServerName = servername;
 884                                 this->InboundDescription = description;
 885                                 // this is good. Send our details: Our server name and description and hopcount of 0,
 886                                 // along with the sendpass from this block.
 887                                 this->WriteLine("SERVER "+Srv->GetServerName()+" "+x->SendPass+" 0 :"+Srv->GetServerDescription());
 888                                 // move to the next state, we are now waiting for THEM.
 889                                 this->LinkState = WAIT_AUTH_2;
 890                                 return true;
 891                         }
 892                 }
 893                 this->WriteLine("ERROR :Invalid credentials");
 894                 return false;
 895         }
 896
 897         std::deque<std::string> Split(std::string line, bool stripcolon)
 898         {
 899                 std::deque<std::string> n;
 900                 std::stringstream s(line);
 901                 std::string param = "";
 902                 n.clear();
 903                 int item = 0;
 904                 while (!s.eof())
 905                 {
 906                         s >> param;
 907                         //if ((param != "") && (param != "\n"))
 908                         //{
 909                                 if ((param.c_str()[0] == ':') && (item))
 910                                 {
 911                                         char* str = (char*)param.c_str();
 912                                         str++;
 913                                         param = str;
 914                                         std::string append;
 915                                         while (!s.eof())
 916                                         {
 917                                                 append = "";
 918                                                 s >> append;
 919                                                 if (append != "")
 920                                                 {
 921                                                         param = param + " " + append;
 922                                                 }
 923                                         }
 924                                 }
 925                                 item++;
 926                                 n.push_back(param);
 927                         //}
 928                 }
 929                 return n;
 930         }
 931
 932         bool ProcessLine(std::string line)
 933         {
 934                 char* l = (char*)line.c_str();
 935                 while ((strlen(l)) && (l[strlen(l)-1] == '\r') || (l[strlen(l)-1] == '\n'))
 936                         l[strlen(l)-1] = '\0';
 937                 line = l;
 938                 if (line == "")
 939                         return true;
 940                 Srv->Log(DEBUG,"inbound-line: '"+line+"'");
 941                 std::deque<std::string> params = this->Split(line,true);
 942                 std::string command = "";
 943                 std::string prefix = "";
 944                 if (((params[0].c_str())[0] == ':') && (params.size() > 1))
 945                 {
 946                         prefix = params[0];
 947                         command = params[1];
 948                         char* pref = (char*)prefix.c_str();
 949                         prefix = ++pref;
 950                         params.pop_front();
 951                         params.pop_front();
 952                 }
 953                 else
 954                 {
 955                         prefix = "";
 956                         command = params[0];
 957                         params.pop_front();
 958                 }
 959
 960                 switch (this->LinkState)
 961                 {
 962                         TreeServer* Node;
 963
 964                         case WAIT_AUTH_1:
 965                                 // Waiting for SERVER command from remote server. Server initiating
 966                                 // the connection sends the first SERVER command, listening server
 967                                 // replies with theirs if its happy, then if the initiator is happy,
 968                                 // it starts to send its net sync, which starts the merge, otherwise
 969                                 // it sends an ERROR.
 970                                 if (command == "SERVER")
 971                                 {
 972                                         return this->Inbound_Server(params);
 973                                 }
 974                                 else if (command == "ERROR")
 975                                 {
 976                                         return this->Error(params);
 977                                 }
 978                         break;
 979                         case WAIT_AUTH_2:
 980                                 // Waiting for start of other side's netmerge to say they liked our
 981                                 // password.
 982                                 if (command == "SERVER")
 983                                 {
 984                                         // cant do this, they sent it to us in the WAIT_AUTH_1 state!
 985                                         // silently ignore.
 986                                         return true;
 987                                 }
 988                                 else if (command == "BURST")
 989                                 {
 990                                         this->LinkState = CONNECTED;
 991                                         Node = new TreeServer(InboundServerName,InboundDescription,TreeRoot,this);
 992                                         TreeRoot->AddChild(Node);
 993                                         params.clear();
 994                                         params.push_back(InboundServerName);
 995                                         params.push_back("*");
 996                                         params.push_back("1");
 997                                         params.push_back(":"+InboundDescription);
 998                                         DoOneToAllButSender(TreeRoot->GetName(),"SERVER",params,InboundServerName);
 999                                         this->DoBurst(Node);
1000                                 }
1001                                 else if (command == "ERROR")
1002                                 {
1003                                         return this->Error(params);
1004                                 }
1005
1006                         break;
1007                         case LISTENER:
1008                                 this->WriteLine("ERROR :Internal error -- listening socket accepted its own descriptor!!!");
1009                                 return false;
1010                         break;
1011                         case CONNECTING:
1012                                 if (command == "SERVER")
1013                                 {
1014                                         // another server we connected to, which was in WAIT_AUTH_1 state,
1015                                         // has just sent us their credentials. If we get this far, theyre
1016                                         // happy with OUR credentials, and they are now in WAIT_AUTH_2 state.
1017                                         // if we're happy with this, we should send our netburst which
1018                                         // kickstarts the merge.
1019                                         return this->Outbound_Reply_Server(params);
1020                                 }
1021                                 else if (command == "ERROR")
1022                                 {
1023                                         return this->Error(params);
1024                                 }
1025                         break;
1026                         case CONNECTED:
1027                                 // This is the 'authenticated' state, when all passwords
1028                                 // have been exchanged and anything past this point is taken
1029                                 // as gospel.
1030                                 std::string target = "";
1031                                 if ((command == "NICK") && (params.size() > 1))
1032                                 {
1033                                         return this->IntroduceClient(prefix,params);
1034                                 }
1035                                 else if (command == "FJOIN")
1036                                 {
1037                                         return this->ForceJoin(prefix,params);
1038                                 }
1039                                 else if (command == "SERVER")
1040                                 {
1041                                         return this->RemoteServer(prefix,params);
1042                                 }
1043                                 else if (command == "ERROR")
1044                                 {
1045                                         return this->Error(params);
1046                                 }
1047                                 else if (command == "OPERTYPE")
1048                                 {
1049                                         return this->OperType(prefix,params);
1050                                 }
1051                                 else if (command == "FMODE")
1052                                 {
1053                                         return this->ForceMode(prefix,params);
1054                                 }
1055                                 else if (command == "KILL")
1056                                 {
1057                                         return this->RemoteKill(prefix,params);
1058                                 }
1059                                 else if (command == "FTOPIC")
1060                                 {
1061                                         return this->ForceTopic(prefix,params);
1062                                 }
1063                                 else if (command == "REHASH")
1064                                 {
1065                                         return this->RemoteRehash(prefix,params);
1066                                 }
1067                                 else if (command == "SQUIT")
1068                                 {
1069                                         if (params.size() == 2)
1070                                         {
1071                                                 this->Squit(FindServer(params[0]),params[1]);
1072                                         }
1073                                         return true;
1074                                 }
1075                                 else
1076                                 {
1077                                         // not a special inter-server command.
1078                                         // Emulate the actual user doing the command,
1079                                         // this saves us having a huge ugly parser.
1080                                         userrec* who = Srv->FindNick(prefix);
1081                                         std::string sourceserv = this->myhost;
1082                                         if (this->InboundServerName != "")
1083                                         {
1084                                                 sourceserv = this->InboundServerName;
1085                                         }
1086                                         if (who)
1087                                         {
1088                                                 // its a user
1089                                                 target = who->server;
1090                                                 char* strparams[127];
1091                                                 for (unsigned int q = 0; q < params.size(); q++)
1092                                                 {
1093                                                         strparams[q] = (char*)params[q].c_str();
1094                                                 }
1095                                                 log(DEBUG,"*** CALL COMMAND HANDLER FOR %s, SOURCE: '%s'",command.c_str(),who->nick);
1096                                                 Srv->CallCommandHandler(command, strparams, params.size(), who);
1097                                         }
1098                                         else
1099                                         {
1100                                                 // its not a user. Its either a server, or somethings screwed up.
1101                                                 if (IsServer(prefix))
1102                                                 {
1103                                                         target = Srv->GetServerName();
1104                                                 }
1105                                                 else
1106                                                 {
1107                                                         log(DEBUG,"Command with unknown origin '%s'",prefix.c_str());
1108                                                         return true;
1109                                                 }
1110                                         }
1111                                         return DoOneToAllButSenderRaw(line,sourceserv);
1112
1113                                 }
1114                                 return true;
1115                         break;
1116                 }
1117                 return true;
1118         }
1119
1120         virtual std::string GetName()
1121         {
1122                 std::string sourceserv = this->myhost;
1123                 if (this->InboundServerName != "")
1124                 {
1125                         sourceserv = this->InboundServerName;
1126                 }
1127                 return sourceserv;
1128         }
1129
1130         virtual void OnTimeout()
1131         {
1132                 if (this->LinkState == CONNECTING)
1133                 {
1134                         Srv->SendOpers("*** CONNECT: Connection to \002"+myhost+"\002 timed out.");
1135                 }
1136         }
1137
1138         virtual void OnClose()
1139         {
1140                 // Connection closed.
1141                 // If the connection is fully up (state CONNECTED)
1142                 // then propogate a netsplit to all peers.
1143                 std::string quitserver = this->myhost;
1144                 if (this->InboundServerName != "")
1145                 {
1146                         quitserver = this->InboundServerName;
1147                 }
1148                 TreeServer* s = FindServer(quitserver);
1149                 if (s)
1150                 {
1151                         Squit(s,"Remote host closed the connection");
1152                 }
1153         }
1154
1155         virtual int OnIncomingConnection(int newsock, char* ip)
1156         {
1157                 TreeSocket* s = new TreeSocket(newsock, ip);
1158                 Srv->AddSocket(s);
1159                 return true;
1160         }
1161 };
1162
1163 bool DoOneToAllButSenderRaw(std::string data,std::string omit)
1164 {
1165         TreeServer* omitroute = BestRouteTo(omit);
1166         for (unsigned int x = 0; x < TreeRoot->ChildCount(); x++)
1167         {
1168                 TreeServer* Route = TreeRoot->GetChild(x);
1169                 if ((Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
1170                 {
1171                         TreeSocket* Sock = Route->GetSocket();
1172                         log(DEBUG,"Sending RAW to %s",Route->GetName().c_str());
1173                         Sock->WriteLine(data);
1174                 }
1175         }
1176         return true;
1177 }
1178
1179 bool DoOneToAllButSender(std::string prefix, std::string command, std::deque<std::string> params, std::string omit)
1180 {
1181         log(DEBUG,"ALLBUTONE: Comes from %s SHOULD NOT go back to %s",prefix.c_str(),omit.c_str());
1182         TreeServer* omitroute = BestRouteTo(omit);
1183         // TODO: Special stuff with privmsg and notice
1184         std::string FullLine = ":" + prefix + " " + command;
1185         for (unsigned int x = 0; x < params.size(); x++)
1186         {
1187                 FullLine = FullLine + " " + params[x];
1188         }
1189         for (unsigned int x = 0; x < TreeRoot->ChildCount(); x++)
1190         {
1191                 TreeServer* Route = TreeRoot->GetChild(x);
1192                 // Send the line IF:
1193                 // The route has a socket (its a direct connection)
1194                 // The route isnt the one to be omitted
1195                 // The route isnt the path to the one to be omitted
1196                 if ((Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
1197                 {
1198                         TreeSocket* Sock = Route->GetSocket();
1199                         log(DEBUG,"Sending to %s",Route->GetName().c_str());
1200                         Sock->WriteLine(FullLine);
1201                 }
1202         }
1203         return true;
1204 }
1205
1206 bool DoOneToMany(std::string prefix, std::string command, std::deque<std::string> params)
1207 {
1208         Srv->Log(DEBUG,"ONETOMANY: "+command);
1209         std::string FullLine = ":" + prefix + " " + command;
1210         for (unsigned int x = 0; x < params.size(); x++)
1211         {
1212                 FullLine = FullLine + " " + params[x];
1213         }
1214         for (unsigned int x = 0; x < TreeRoot->ChildCount(); x++)
1215         {
1216                 TreeServer* Route = TreeRoot->GetChild(x);
1217                 if (Route->GetSocket())
1218                 {
1219                         TreeSocket* Sock = Route->GetSocket();
1220                         Sock->WriteLine(FullLine);
1221                 }
1222         }
1223         return true;
1224 }
1225
1226 bool DoOneToOne(std::string prefix, std::string command, std::deque<std::string> params, std::string target)
1227 {
1228         TreeServer* Route = BestRouteTo(target);
1229         if (Route)
1230         {
1231                 std::string FullLine = ":" + prefix + " " + command;
1232                 for (unsigned int x = 0; x < params.size(); x++)
1233                 {
1234                         FullLine = FullLine + " " + params[x];
1235                 }
1236                 if (Route->GetSocket())
1237                 {
1238                         TreeSocket* Sock = Route->GetSocket();
1239                         Sock->WriteLine(FullLine);
1240                 }
1241                 return true;
1242         }
1243         else
1244         {
1245                 log(DEBUG,"Could not route message with target %s: %s",target.c_str(),command.c_str());
1246                 return true;
1247         }
1248 }
1249
1250 std::vector<TreeSocket*> Bindings;
1251
1252 void ReadConfiguration(bool rebind)
1253 {
1254         if (rebind)
1255         {
1256                 for (int j =0; j < Conf->Enumerate("bind"); j++)
1257                 {
1258                         std::string Type = Conf->ReadValue("bind","type",j);
1259                         std::string IP = Conf->ReadValue("bind","address",j);
1260                         long Port = Conf->ReadInteger("bind","port",j,true);
1261                         if (Type == "servers")
1262                         {
1263                                 if (IP == "*")
1264                                 {
1265                                         IP = "";
1266                                 }
1267                                 TreeSocket* listener = new TreeSocket(IP.c_str(),Port,true,10);
1268                                 if (listener->GetState() == I_LISTENING)
1269                                 {
1270                                         Srv->AddSocket(listener);
1271                                         Bindings.push_back(listener);
1272                                 }
1273                                 else
1274                                 {
1275                                         log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port %d",Port);
1276                                         listener->Close();
1277                                         delete listener;
1278                                 }
1279                         }
1280                 }
1281         }
1282         LinkBlocks.clear();
1283         for (int j =0; j < Conf->Enumerate("link"); j++)
1284         {
1285                 Link L;
1286                 L.Name = Conf->ReadValue("link","name",j);
1287                 L.IPAddr = Conf->ReadValue("link","ipaddr",j);
1288                 L.Port = Conf->ReadInteger("link","port",j,true);
1289                 L.SendPass = Conf->ReadValue("link","sendpass",j);
1290                 L.RecvPass = Conf->ReadValue("link","recvpass",j);
1291                 LinkBlocks.push_back(L);
1292                 log(DEBUG,"m_spanningtree: Read server %s with host %s:%d",L.Name.c_str(),L.IPAddr.c_str(),L.Port);
1293         }
1294 }
1295
1296
1297 class ModuleSpanningTree : public Module
1298 {
1299         std::vector<TreeSocket*> Bindings;
1300         int line;
1301
1302  public:
1303
1304         ModuleSpanningTree()
1305         {
1306                 Srv = new Server;
1307                 Conf = new ConfigReader;
1308                 Bindings.clear();
1309
1310                 // Create the root of the tree
1311                 TreeRoot = new TreeServer(Srv->GetServerName(),Srv->GetServerDescription());
1312
1313                 ReadConfiguration(true);
1314         }
1315
1316         void ShowLinks(TreeServer* Current, userrec* user, int hops)
1317         {
1318                 std::string Parent = TreeRoot->GetName();
1319                 if (Current->GetParent())
1320                 {
1321                         Parent = Current->GetParent()->GetName();
1322                 }
1323                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
1324                 {
1325                         ShowLinks(Current->GetChild(q),user,hops+1);
1326                 }
1327                 WriteServ(user->fd,"364 %s %s %s :%d %s",user->nick,Current->GetName().c_str(),Parent.c_str(),hops,Current->GetDesc().c_str());
1328         }
1329
1330         void HandleLinks(char** parameters, int pcnt, userrec* user)
1331         {
1332                 ShowLinks(TreeRoot,user,0);
1333                 WriteServ(user->fd,"365 %s * :End of /LINKS list.",user->nick);
1334                 return;
1335         }
1336
1337         void HandleLusers(char** parameters, int pcnt, userrec* user)
1338         {
1339                 return;
1340         }
1341
1342         // WARNING: NOT THREAD SAFE - DONT GET ANY SMART IDEAS.
1343
1344         void ShowMap(TreeServer* Current, userrec* user, int depth, char matrix[128][80])
1345         {
1346                 if (line < 128)
1347                 {
1348                         for (int t = 0; t < depth; t++)
1349                         {
1350                                 matrix[line][t] = ' ';
1351                         }
1352                         strlcpy(&matrix[line][depth],Current->GetName().c_str(),80);
1353                         line++;
1354                         for (unsigned int q = 0; q < Current->ChildCount(); q++)
1355                         {
1356                                 ShowMap(Current->GetChild(q),user,depth+2,matrix);
1357                         }
1358                 }
1359         }
1360
1361         // Ok, prepare to be confused.
1362         // After much mulling over how to approach this, it struck me that
1363         // the 'usual' way of doing a /MAP isnt the best way. Instead of
1364         // keeping track of a ton of ascii characters, and line by line
1365         // under recursion working out where to place them using multiplications
1366         // and divisons, we instead render the map onto a backplane of characters
1367         // (a character matrix), then draw the branches as a series of "L" shapes
1368         // from the nodes. This is not only friendlier on CPU it uses less stack.
1369
1370         void HandleMap(char** parameters, int pcnt, userrec* user)
1371         {
1372                 // This array represents a virtual screen which we will
1373                 // "scratch" draw to, as the console device of an irc
1374                 // client does not provide for a proper terminal.
1375                 char matrix[128][80];
1376                 for (unsigned int t = 0; t < 128; t++)
1377                 {
1378                         matrix[t][0] = '\0';
1379                 }
1380                 line = 0;
1381                 // The only recursive bit is called here.
1382                 ShowMap(TreeRoot,user,0,matrix);
1383                 // Process each line one by one. The algorithm has a limit of
1384                 // 128 servers (which is far more than a spanning tree should have
1385                 // anyway, so we're ok). This limit can be raised simply by making
1386                 // the character matrix deeper, 128 rows taking 10k of memory.
1387                 for (int l = 1; l < line; l++)
1388                 {
1389                         // scan across the line looking for the start of the
1390                         // servername (the recursive part of the algorithm has placed
1391                         // the servers at indented positions depending on what they
1392                         // are related to)
1393                         int first_nonspace = 0;
1394                         while (matrix[l][first_nonspace] == ' ')
1395                         {
1396                                 first_nonspace++;
1397                         }
1398                         first_nonspace--;
1399                         // Draw the `- (corner) section: this may be overwritten by
1400                         // another L shape passing along the same vertical pane, becoming
1401                         // a |- (branch) section instead.
1402                         matrix[l][first_nonspace] = '-';
1403                         matrix[l][first_nonspace-1] = '`';
1404                         int l2 = l - 1;
1405                         // Draw upwards until we hit the parent server, causing possibly
1406                         // other corners (`-) to become branches (|-)
1407                         while ((matrix[l2][first_nonspace-1] == ' ') || (matrix[l2][first_nonspace-1] == '`'))
1408                         {
1409                                 matrix[l2][first_nonspace-1] = '|';
1410                                 l2--;
1411                         }
1412                 }
1413                 // dump the whole lot to the user. This is the easy bit, honest.
1414                 for (int t = 0; t < line; t++)
1415                 {
1416                         WriteServ(user->fd,"006 %s :%s",user->nick,&matrix[t][0]);
1417                 }
1418                 WriteServ(user->fd,"007 %s :End of /MAP",user->nick);
1419                 return;
1420         }
1421
1422         int HandleSquit(char** parameters, int pcnt, userrec* user)
1423         {
1424                 return 1;
1425         }
1426
1427         int HandleConnect(char** parameters, int pcnt, userrec* user)
1428         {
1429                 for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
1430                 {
1431                         if (Srv->MatchText(x->Name.c_str(),parameters[0]))
1432                         {
1433                                 WriteServ(user->fd,"NOTICE %s :*** CONNECT: Connecting to server: %s (%s:%d)",user->nick,x->Name.c_str(),x->IPAddr.c_str(),x->Port);
1434                                 TreeSocket* newsocket = new TreeSocket(x->IPAddr,x->Port,false,10,x->Name);
1435                                 Srv->AddSocket(newsocket);
1436                                 return 1;
1437                         }
1438                 }
1439                 WriteServ(user->fd,"NOTICE %s :*** CONNECT: No matching server could be found in the config file.",user->nick);
1440                 return 1;
1441         }
1442
1443         virtual int OnPreCommand(std::string command, char **parameters, int pcnt, userrec *user)
1444         {
1445                 if (command == "CONNECT")
1446                 {
1447                         return this->HandleConnect(parameters,pcnt,user);
1448                 }
1449                 else if (command == "SQUIT")
1450                 {
1451                         return this->HandleSquit(parameters,pcnt,user);
1452                 }
1453                 else if (command == "MAP")
1454                 {
1455                         this->HandleMap(parameters,pcnt,user);
1456                         return 1;
1457                 }
1458                 else if (command == "LUSERS")
1459                 {
1460                         this->HandleLusers(parameters,pcnt,user);
1461                         return 1;
1462                 }
1463                 else if (command == "LINKS")
1464                 {
1465                         this->HandleLinks(parameters,pcnt,user);
1466                         return 1;
1467                 }
1468                 else if (Srv->IsValidModuleCommand(command, pcnt, user))
1469                 {
1470                         // this bit of code cleverly routes all module commands
1471                         // to all remote severs *automatically* so that modules
1472                         // can just handle commands locally, without having
1473                         // to have any special provision in place for remote
1474                         // commands and linking protocols.
1475                         std::deque<std::string> params;
1476                         params.clear();
1477                         for (int j = 0; j < pcnt; j++)
1478                         {
1479                                 if (strchr(parameters[j],' '))
1480                                 {
1481                                         params.push_back(":" + std::string(parameters[j]));
1482                                 }
1483                                 else
1484                                 {
1485                                         params.push_back(std::string(parameters[j]));
1486                                 }
1487                         }
1488                         DoOneToMany(user->nick,command,params);
1489                 }
1490                 return 0;
1491         }
1492
1493         virtual void OnGetServerDescription(std::string servername,std::string &description)
1494         {
1495                 TreeServer* s = FindServer(servername);
1496                 if (s)
1497                 {
1498                         description = s->GetDesc();
1499                 }
1500         }
1501
1502         virtual void OnUserInvite(userrec* source,userrec* dest,chanrec* channel)
1503         {
1504                 if (std::string(source->server) == Srv->GetServerName())
1505                 {
1506                         std::deque<std::string> params;
1507                         params.push_back(dest->nick);
1508                         params.push_back(channel->name);
1509                         DoOneToMany(source->nick,"INVITE",params);
1510                 }
1511         }
1512
1513         virtual void OnPostLocalTopicChange(userrec* user, chanrec* chan, std::string topic)
1514         {
1515                 std::deque<std::string> params;
1516                 params.push_back(chan->name);
1517                 params.push_back(":"+topic);
1518                 DoOneToMany(user->nick,"TOPIC",params);
1519         }
1520
1521         virtual void OnUserNotice(userrec* user, void* dest, int target_type, std::string text)
1522         {
1523                 if (target_type == TYPE_USER)
1524                 {
1525                         userrec* d = (userrec*)dest;
1526                         if ((std::string(d->server) != Srv->GetServerName()) && (std::string(user->server) == Srv->GetServerName()))
1527                         {
1528                                 std::deque<std::string> params;
1529                                 params.clear();
1530                                 params.push_back(d->nick);
1531                                 params.push_back(":"+text);
1532                                 DoOneToOne(user->nick,"NOTICE",params,d->server);
1533                         }
1534                 }
1535                 else
1536                 {
1537                         if (std::string(user->server) == Srv->GetServerName())
1538                         {
1539                                 chanrec *c = (chanrec*)dest;
1540                                 std::deque<std::string> params;
1541                                 params.push_back(c->name);
1542                                 params.push_back(":"+text);
1543                                 DoOneToMany(user->nick,"NOTICE",params);
1544                         }
1545                 }
1546         }
1547
1548         virtual void OnUserMessage(userrec* user, void* dest, int target_type, std::string text)
1549         {
1550                 if (target_type == TYPE_USER)
1551                 {
1552                         // route private messages which are targetted at clients only to the server
1553                         // which needs to receive them
1554                         userrec* d = (userrec*)dest;
1555                         if ((std::string(d->server) != Srv->GetServerName()) && (std::string(user->server) == Srv->GetServerName()))
1556                         {
1557                                 std::deque<std::string> params;
1558                                 params.clear();
1559                                 params.push_back(d->nick);
1560                                 params.push_back(":"+text);
1561                                 DoOneToOne(user->nick,"PRIVMSG",params,d->server);
1562                         }
1563                 }
1564                 else
1565                 {
1566                         if (std::string(user->server) == Srv->GetServerName())
1567                         {
1568                                 chanrec *c = (chanrec*)dest;
1569                                 std::deque<std::string> params;
1570                                 params.push_back(c->name);
1571                                 params.push_back(":"+text);
1572                                 DoOneToMany(user->nick,"PRIVMSG",params);
1573                         }
1574                 }
1575         }
1576
1577         virtual void OnUserJoin(userrec* user, chanrec* channel)
1578         {
1579                 // Only do this for local users
1580                 if (std::string(user->server) == Srv->GetServerName())
1581                 {
1582                         log(DEBUG,"**** User on %s JOINS %s",user->server,channel->name);
1583                         std::deque<std::string> params;
1584                         params.clear();
1585                         params.push_back(channel->name);
1586                         if (*channel->key)
1587                         {
1588                                 log(DEBUG,"**** With key %s",channel->key);
1589                                 // if the channel has a key, force the join by emulating the key.
1590                                 params.push_back(channel->key);
1591                         }
1592                         DoOneToMany(user->nick,"JOIN",params);
1593                 }
1594         }
1595
1596         virtual void OnUserPart(userrec* user, chanrec* channel)
1597         {
1598                 if (std::string(user->server) == Srv->GetServerName())
1599                 {
1600                         log(DEBUG,"**** User on %s PARTS %s",user->server,channel->name);
1601                         std::deque<std::string> params;
1602                         params.clear();
1603                         params.push_back(channel->name);
1604                         DoOneToMany(user->nick,"PART",params);
1605                 }
1606         }
1607
1608         virtual void OnUserConnect(userrec* user)
1609         {
1610                 char agestr[MAXBUF];
1611                 if (std::string(user->server) == Srv->GetServerName())
1612                 {
1613                         log(DEBUG,"**** User on %s CONNECTS: %s",user->server,user->nick);
1614                         std::deque<std::string> params;
1615                         snprintf(agestr,MAXBUF,"%lu",(unsigned long)user->age);
1616                         params.clear();
1617                         params.push_back(agestr);
1618                         params.push_back(user->nick);
1619                         params.push_back(user->host);
1620                         params.push_back(user->dhost);
1621                         params.push_back(user->ident);
1622                         params.push_back("+"+std::string(user->modes));
1623                         params.push_back(user->ip);
1624                         params.push_back(":"+std::string(user->fullname));
1625                         DoOneToMany(Srv->GetServerName(),"NICK",params);
1626                 }
1627         }
1628
1629         virtual void OnUserQuit(userrec* user, std::string reason)
1630         {
1631                 if (std::string(user->server) == Srv->GetServerName())
1632                 {
1633                         log(DEBUG,"**** User on %s QUITS: %s",user->server,user->nick);
1634                         std::deque<std::string> params;
1635                         params.push_back(":"+reason);
1636                         DoOneToMany(user->nick,"QUIT",params);
1637                 }
1638         }
1639
1640         virtual void OnUserPostNick(userrec* user, std::string oldnick)
1641         {
1642                 if (std::string(user->server) == Srv->GetServerName())
1643                 {
1644                         log(DEBUG,"**** User on %s changes NICK: %s",user->server,user->nick);
1645                         std::deque<std::string> params;
1646                         params.push_back(user->nick);
1647                         DoOneToMany(oldnick,"NICK",params);
1648                 }
1649         }
1650
1651         virtual void OnUserKick(userrec* source, userrec* user, chanrec* chan, std::string reason)
1652         {
1653                 if (std::string(source->server) == Srv->GetServerName())
1654                 {
1655                         log(DEBUG,"**** User on %s KICKs: %s %s",source->server,source->nick,user->nick);
1656                         std::deque<std::string> params;
1657                         params.push_back(chan->name);
1658                         params.push_back(user->nick);
1659                         params.push_back(":"+reason);
1660                         DoOneToMany(source->nick,"KICK",params);
1661                 }
1662         }
1663
1664         virtual void OnRemoteKill(userrec* source, userrec* dest, std::string reason)
1665         {
1666                 std::deque<std::string> params;
1667                 params.push_back(dest->nick);
1668                 params.push_back(":"+reason);
1669                 DoOneToMany(source->nick,"KILL",params);
1670         }
1671
1672         virtual void OnRehash(std::string parameter)
1673         {
1674                 if (parameter != "")
1675                 {
1676                         std::deque<std::string> params;
1677                         params.push_back(parameter);
1678                         DoOneToMany(Srv->GetServerName(),"REHASH",params);
1679                         // check for self
1680                         if (Srv->MatchText(Srv->GetServerName(),parameter))
1681                         {
1682                                 Srv->SendOpers("*** Remote rehash initiated from server \002"+Srv->GetServerName()+"\002.");
1683                                 Srv->RehashServer();
1684                         }
1685                 }
1686                 ReadConfiguration(false);
1687         }
1688
1689         // note: the protocol does not allow direct umode +o except
1690         // via NICK with 8 params. sending OPERTYPE infers +o modechange
1691         // locally.
1692         virtual void OnOper(userrec* user, std::string opertype)
1693         {
1694                 if (std::string(user->server) == Srv->GetServerName())
1695                 {
1696                         std::deque<std::string> params;
1697                         params.push_back(opertype);
1698                         DoOneToMany(user->nick,"OPERTYPE",params);
1699                 }
1700         }
1701
1702         virtual void OnMode(userrec* user, void* dest, int target_type, std::string text)
1703         {
1704                 log(DEBUG,"*** ONMODE TRIGGER");
1705                 if (std::string(user->server) == Srv->GetServerName())
1706                 {
1707                         log(DEBUG,"*** LOCAL");
1708                         if (target_type == TYPE_USER)
1709                         {
1710                                 userrec* u = (userrec*)dest;
1711                                 std::deque<std::string> params;
1712                                 params.push_back(u->nick);
1713                                 params.push_back(text);
1714                                 DoOneToMany(user->nick,"MODE",params);
1715                         }
1716                         else
1717                         {
1718                                 chanrec* c = (chanrec*)dest;
1719                                 std::deque<std::string> params;
1720                                 params.push_back(c->name);
1721                                 params.push_back(text);
1722                                 DoOneToMany(user->nick,"MODE",params);
1723                         }
1724                 }
1725         }
1726
1727         virtual void ProtoSendMode(void* opaque, int target_type, void* target, std::string modeline)
1728         {
1729                 TreeSocket* s = (TreeSocket*)opaque;
1730                 if (target)
1731                 {
1732                         if (target_type == TYPE_USER)
1733                         {
1734                                 userrec* u = (userrec*)target;
1735                                 s->WriteLine(":"+Srv->GetServerName()+" FMODE "+u->nick+" "+modeline);
1736                         }
1737                         else
1738                         {
1739                                 chanrec* c = (chanrec*)target;
1740                                 s->WriteLine(":"+Srv->GetServerName()+" FMODE "+c->name+" "+modeline);
1741                         }
1742                 }
1743         }
1744
1745         virtual ~ModuleSpanningTree()
1746         {
1747                 delete Srv;
1748         }
1749
1750         virtual Version GetVersion()
1751         {
1752                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
1753         }
1754 };
1755
1756
1757 class ModuleSpanningTreeFactory : public ModuleFactory
1758 {
1759  public:
1760         ModuleSpanningTreeFactory()
1761         {
1762         }
1763
1764         ~ModuleSpanningTreeFactory()
1765         {
1766         }
1767
1768         virtual Module * CreateModule()
1769         {
1770                 TreeProtocolModule = new ModuleSpanningTree;
1771                 return TreeProtocolModule;
1772         }
1773
1774 };
1775
1776
1777 extern "C" void * init_module( void )
1778 {
1779         return new ModuleSpanningTreeFactory;
1780 }
1781