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 second[MAXBUF];
 502                 char* mode_users[127];
 503                 mode_users[0] = first;
 504                 mode_users[1] = second;
 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                         char* mode = NULL;
 522                         userrec* who = Srv->FindNick(usr);
 523                         if (who)
 524                         {
 525                                 switch (permissions)
 526                                 {
 527                                         case '@':
 528                                                 usr++;
 529                                                 mode_users[modectr++] = usr;
 530                                                 strlcat(modestring,"o",MAXBUF);
 531                                         break;
 532                                         case '%':
 533                                                 usr++;
 534                                                 mode_users[modectr++] = usr;
 535                                                 strlcat(modestring,"h",MAXBUF);
 536                                         break;
 537                                         case '+':
 538                                                 usr++;
 539                                                 mode_users[modectr++] = usr;
 540                                                 strlcat(modestring,"v",MAXBUF);
 541                                         break;
 542                                 }
 543                                 Srv->JoinUserToChannel(who,channel,key);
 544                                 if (modectr >= (MAXMODES-1))
 545                                 {
 546                                         // theres a mode for this user. push them onto the mode queue, and flush it
 547                                         // if there are more than MAXMODES to go.
 548                                         Srv->SendMode(mode_users,modectr,who);
 549                                         strcpy(mode_users[1],"+");
 550                                         modectr = 2;
 551                                 }
 552                         }
 553                 }
 554                 // there werent enough modes built up to flush it during FJOIN,
 555                 // or, there are a number left over. flush them out.
 556                 if (modectr > 2)
 557                 {
 558                         Srv->SendMode(mode_users,modectr,who);
 559                 }
 560                 DoOneToAllButSender(source,"FJOIN",params,who->server);
 561                 return true;
 562         }
 563
 564         bool IntroduceClient(std::string source, std::deque<std::string> params)
 565         {
 566                 if (params.size() < 8)
 567                         return true;
 568                 // NICK age nick host dhost ident +modes ip :gecos
 569                 //       0   1    2    3      4     5    6   7
 570                 std::string nick = params[1];
 571                 std::string host = params[2];
 572                 std::string dhost = params[3];
 573                 std::string ident = params[4];
 574                 time_t age = atoi(params[0].c_str());
 575                 std::string modes = params[5];
 576                 if (*(modes.c_str()) == '+')
 577                 {
 578                         char* m = (char*)modes.c_str();
 579                         m++;
 580                         modes = m;
 581                 }
 582                 std::string ip = params[6];
 583                 std::string gecos = params[7];
 584                 char* tempnick = (char*)nick.c_str();
 585                 log(DEBUG,"Introduce client %s!%s@%s",tempnick,ident.c_str(),host.c_str());
 586
 587                 user_hash::iterator iter;
 588                 iter = clientlist.find(tempnick);
 589                 if (iter != clientlist.end())
 590                 {
 591                         // nick collision
 592                         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);
 593                         this->WriteLine(":"+Srv->GetServerName()+" KILL "+tempnick+" :Nickname collision");
 594                         return true;
 595                 }
 596
 597                 clientlist[tempnick] = new userrec();
 598                 clientlist[tempnick]->fd = FD_MAGIC_NUMBER;
 599                 strlcpy(clientlist[tempnick]->nick, tempnick,NICKMAX);
 600                 strlcpy(clientlist[tempnick]->host, host.c_str(),160);
 601                 strlcpy(clientlist[tempnick]->dhost, dhost.c_str(),160);
 602                 clientlist[tempnick]->server = (char*)FindServerNamePtr(source.c_str());
 603                 strlcpy(clientlist[tempnick]->ident, ident.c_str(),IDENTMAX);
 604                 strlcpy(clientlist[tempnick]->fullname, gecos.c_str(),MAXGECOS);
 605                 clientlist[tempnick]->registered = 7;
 606                 clientlist[tempnick]->signon = age;
 607                 strlcpy(clientlist[tempnick]->ip,ip.c_str(),16);
 608                 for (int i = 0; i < MAXCHANS; i++)
 609                 {
 610                         clientlist[tempnick]->chans[i].channel = NULL;
 611                         clientlist[tempnick]->chans[i].uc_modes = 0;
 612                 }
 613                 params[7] = ":" + params[7];
 614                 DoOneToAllButSender(source,"NICK",params,source);
 615                 return true;
 616         }
 617
 618         void SendFJoins(TreeServer* Current, chanrec* c)
 619         {
 620                 char list[MAXBUF];
 621                 snprintf(list,MAXBUF,":%s FJOIN %s ",Srv->GetServerName(),c->name);
 622                 std::vector<char*> *ulist = c->GetUsers();
 623                 for (unsigned int i = 0; i < ulist->size(); i++)
 624                 {
 625                         char* o = (*ulist)[i];
 626                         userrec* otheruser = (userrec*)o;
 627                         strlcat(list,cmode(otheruser,c),MAXBUF);
 628                         strlcat(list,otheruser->nick,MAXBUF);
 629                         strlcat(list," ",MAXBUF);
 630                         if (strlen(list)>(480-NICKMAX))
 631                         {
 632                                 this->WriteLine(list);
 633                                 snprintf(list,MAXBUF,":%s FJOIN %s ",Srv->GetServerName(),c->name);
 634                         }
 635                 }
 636                 if (list[strlen(list)-1] != ':')
 637                 {
 638                         this->WriteLine(list);
 639                 }
 640         }
 641
 642         void SendChannelModes(TreeServer* Current)
 643         {
 644                 char data[MAXBUF];
 645                 for (chan_hash::iterator c = chanlist.begin(); c != chanlist.end(); c++)
 646                 {
 647                         SendFJoins(Current, c->second);
 648                         snprintf(data,MAXBUF,":%s FMODE %s +%s",Srv->GetServerName().c_str(),c->second->name,chanmodes(c->second));
 649                         this->WriteLine(data);
 650                         if (*c->second->topic)
 651                         {
 652                                 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);
 653                                 this->WriteLine(data);
 654                         }
 655                         for (BanList::iterator b = c->second->bans.begin(); b != c->second->bans.end(); b++)
 656                         {
 657                                 snprintf(data,MAXBUF,":%s FMODE %s +b %s",Srv->GetServerName().c_str(),c->second->name,b->data);
 658                                 this->WriteLine(data);
 659                         }
 660                         FOREACH_MOD OnSyncChannel(c->second,(Module*)TreeProtocolModule,(void*)this);
 661                 }
 662         }
 663
 664         // send all users and their channels
 665         void SendUsers(TreeServer* Current)
 666         {
 667                 char data[MAXBUF];
 668                 for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 669                 {
 670                         if (u->second->registered == 7)
 671                         {
 672                                 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);
 673                                 this->WriteLine(data);
 674                                 if (strchr(u->second->modes,'o'))
 675                                 {
 676                                         this->WriteLine(":"+std::string(u->second->nick)+" OPERTYPE "+std::string(u->second->oper));
 677                                 }
 678                                 //char* chl = chlist(u->second,u->second);
 679                                 //if (*chl)
 680                                 //{
 681                                 //      this->WriteLine(":"+std::string(u->second->nick)+" FJOIN "+std::string(chl));
 682                                 //}
 683                                 FOREACH_MOD OnSyncUser(u->second,(Module*)TreeProtocolModule,(void*)this);
 684                         }
 685                 }
 686         }
 687
 688         void DoBurst(TreeServer* s)
 689         {
 690                 log(DEBUG,"Beginning network burst");
 691                 Srv->SendOpers("*** Bursting to "+s->GetName()+".");
 692                 this->WriteLine("BURST");
 693                 // Send server tree
 694                 this->SendServers(TreeRoot,s,1);
 695                 // Send users and their channels
 696                 this->SendUsers(s);
 697                 // TODO: Send everything else (channel modes etc)
 698                 this->SendChannelModes(s);
 699                 this->WriteLine("ENDBURST");
 700         }
 701
 702         virtual bool OnDataReady()
 703         {
 704                 char* data = this->Read();
 705                 if (data)
 706                 {
 707                         this->in_buffer += data;
 708                         while (in_buffer.find("\n") != std::string::npos)
 709                         {
 710                                 char* line = (char*)in_buffer.c_str();
 711                                 std::string ret = "";
 712                                 while ((*line != '\n') && (strlen(line)))
 713                                 {
 714                                         ret = ret + *line;
 715                                         line++;
 716                                 }
 717                                 if ((*line == '\n') || (*line == '\r'))
 718                                         line++;
 719                                 in_buffer = line;
 720                                 if (!this->ProcessLine(ret))
 721                                 {
 722                                         return false;
 723                                 }
 724                         }
 725                 }
 726                 return (data != NULL);
 727         }
 728
 729         int WriteLine(std::string line)
 730         {
 731                 return this->Write(line + "\r\n");
 732         }
 733
 734         bool Error(std::deque<std::string> params)
 735         {
 736                 if (params.size() < 1)
 737                         return false;
 738                 std::string Errmsg = params[0];
 739                 std::string SName = myhost;
 740                 if (InboundServerName != "")
 741                 {
 742                         SName = InboundServerName;
 743                 }
 744                 Srv->SendOpers("*** ERROR from "+SName+": "+Errmsg);
 745                 // we will return false to cause the socket to close.
 746                 return false;
 747         }
 748
 749         bool OperType(std::string prefix, std::deque<std::string> params)
 750         {
 751                 if (params.size() != 1)
 752                         return true;
 753                 std::string opertype = params[0];
 754                 userrec* u = Srv->FindNick(prefix);
 755                 if (u)
 756                 {
 757                         strlcpy(u->oper,opertype.c_str(),NICKMAX);
 758                         if (!strchr(u->modes,'o'))
 759                         {
 760                                 strcat(u->modes,"o");
 761                         }
 762                         DoOneToAllButSender(u->server,"OPERTYPE",params,u->server);
 763                 }
 764                 return true;
 765         }
 766
 767         bool RemoteRehash(std::string prefix, std::deque<std::string> params)
 768         {
 769                 if (params.size() < 1)
 770                         return true;
 771                 std::string servermask = params[0];
 772                 if (Srv->MatchText(Srv->GetServerName(),servermask))
 773                 {
 774                         Srv->SendOpers("*** Remote rehash initiated from server \002"+prefix+"\002.");
 775                         Srv->RehashServer();
 776                         ReadConfiguration(false);
 777                 }
 778                 DoOneToAllButSender(prefix,"REHASH",params,prefix);
 779                 return true;
 780         }
 781
 782         bool RemoteKill(std::string prefix, std::deque<std::string> params)
 783         {
 784                 if (params.size() != 2)
 785                         return true;
 786                 std::string nick = params[0];
 787                 std::string reason = params[1];
 788                 userrec* u = Srv->FindNick(prefix);
 789                 userrec* who = Srv->FindNick(nick);
 790                 if (who)
 791                 {
 792                         std::string sourceserv = prefix;
 793                         if (u)
 794                         {
 795                                 sourceserv = u->server;
 796                         }
 797                         params[1] = ":" + params[1];
 798                         DoOneToAllButSender(prefix,"KILL",params,sourceserv);
 799                         Srv->QuitUser(who,reason);
 800                 }
 801                 return true;
 802         }
 803
 804         bool RemoteServer(std::string prefix, std::deque<std::string> params)
 805         {
 806                 if (params.size() < 4)
 807                         return false;
 808                 std::string servername = params[0];
 809                 std::string password = params[1];
 810                 // hopcount is not used for a remote server, we calculate this ourselves
 811                 std::string description = params[3];
 812                 TreeServer* ParentOfThis = FindServer(prefix);
 813                 if (!ParentOfThis)
 814                 {
 815                         this->WriteLine("ERROR :Protocol error - Introduced remote server from unknown server "+prefix);
 816                         return false;
 817                 }
 818                 TreeServer* Node = new TreeServer(servername,description,ParentOfThis,NULL);
 819                 ParentOfThis->AddChild(Node);
 820                 params[3] = ":" + params[3];
 821                 DoOneToAllButSender(prefix,"SERVER",params,prefix);
 822                 Srv->SendOpers("*** Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
 823                 return true;
 824         }
 825
 826         bool Outbound_Reply_Server(std::deque<std::string> params)
 827         {
 828                 if (params.size() < 4)
 829                         return false;
 830                 std::string servername = params[0];
 831                 std::string password = params[1];
 832                 int hops = atoi(params[2].c_str());
 833                 if (hops)
 834                 {
 835                         this->WriteLine("ERROR :Server too far away for authentication");
 836                         return false;
 837                 }
 838                 std::string description = params[3];
 839                 for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 840                 {
 841                         if ((x->Name == servername) && (x->RecvPass == password))
 842                         {
 843                                 // Begin the sync here. this kickstarts the
 844                                 // other side, waiting in WAIT_AUTH_2 state,
 845                                 // into starting their burst, as it shows
 846                                 // that we're happy.
 847                                 this->LinkState = CONNECTED;
 848                                 // we should add the details of this server now
 849                                 // to the servers tree, as a child of the root
 850                                 // node.
 851                                 TreeServer* Node = new TreeServer(servername,description,TreeRoot,this);
 852                                 TreeRoot->AddChild(Node);
 853                                 params[3] = ":" + params[3];
 854                                 DoOneToAllButSender(TreeRoot->GetName(),"SERVER",params,servername);
 855                                 this->DoBurst(Node);
 856                                 return true;
 857                         }
 858                 }
 859                 this->WriteLine("ERROR :Invalid credentials");
 860                 return false;
 861         }
 862
 863         bool Inbound_Server(std::deque<std::string> params)
 864         {
 865                 if (params.size() < 4)
 866                         return false;
 867                 std::string servername = params[0];
 868                 std::string password = params[1];
 869                 int hops = atoi(params[2].c_str());
 870                 if (hops)
 871                 {
 872                         this->WriteLine("ERROR :Server too far away for authentication");
 873                         return false;
 874                 }
 875                 std::string description = params[3];
 876                 for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
 877                 {
 878                         if ((x->Name == servername) && (x->RecvPass == password))
 879                         {
 880                                 Srv->SendOpers("*** Verified incoming server connection from \002"+servername+"\002["+this->GetIP()+"] ("+description+")");
 881                                 this->InboundServerName = servername;
 882                                 this->InboundDescription = description;
 883                                 // this is good. Send our details: Our server name and description and hopcount of 0,
 884                                 // along with the sendpass from this block.
 885                                 this->WriteLine("SERVER "+Srv->GetServerName()+" "+x->SendPass+" 0 :"+Srv->GetServerDescription());
 886                                 // move to the next state, we are now waiting for THEM.
 887                                 this->LinkState = WAIT_AUTH_2;
 888                                 return true;
 889                         }
 890                 }
 891                 this->WriteLine("ERROR :Invalid credentials");
 892                 return false;
 893         }
 894
 895         std::deque<std::string> Split(std::string line, bool stripcolon)
 896         {
 897                 std::deque<std::string> n;
 898                 std::stringstream s(line);
 899                 std::string param = "";
 900                 n.clear();
 901                 int item = 0;
 902                 while (!s.eof())
 903                 {
 904                         s >> param;
 905                         //if ((param != "") && (param != "\n"))
 906                         //{
 907                                 if ((param.c_str()[0] == ':') && (item))
 908                                 {
 909                                         char* str = (char*)param.c_str();
 910                                         str++;
 911                                         param = str;
 912                                         std::string append;
 913                                         while (!s.eof())
 914                                         {
 915                                                 append = "";
 916                                                 s >> append;
 917                                                 if (append != "")
 918                                                 {
 919                                                         param = param + " " + append;
 920                                                 }
 921                                         }
 922                                 }
 923                                 item++;
 924                                 n.push_back(param);
 925                         //}
 926                 }
 927                 return n;
 928         }
 929
 930         bool ProcessLine(std::string line)
 931         {
 932                 char* l = (char*)line.c_str();
 933                 while ((strlen(l)) && (l[strlen(l)-1] == '\r') || (l[strlen(l)-1] == '\n'))
 934                         l[strlen(l)-1] = '\0';
 935                 line = l;
 936                 if (line == "")
 937                         return true;
 938                 Srv->Log(DEBUG,"inbound-line: '"+line+"'");
 939                 std::deque<std::string> params = this->Split(line,true);
 940                 std::string command = "";
 941                 std::string prefix = "";
 942                 if (((params[0].c_str())[0] == ':') && (params.size() > 1))
 943                 {
 944                         prefix = params[0];
 945                         command = params[1];
 946                         char* pref = (char*)prefix.c_str();
 947                         prefix = ++pref;
 948                         params.pop_front();
 949                         params.pop_front();
 950                 }
 951                 else
 952                 {
 953                         prefix = "";
 954                         command = params[0];
 955                         params.pop_front();
 956                 }
 957
 958                 switch (this->LinkState)
 959                 {
 960                         TreeServer* Node;
 961
 962                         case WAIT_AUTH_1:
 963                                 // Waiting for SERVER command from remote server. Server initiating
 964                                 // the connection sends the first SERVER command, listening server
 965                                 // replies with theirs if its happy, then if the initiator is happy,
 966                                 // it starts to send its net sync, which starts the merge, otherwise
 967                                 // it sends an ERROR.
 968                                 if (command == "SERVER")
 969                                 {
 970                                         return this->Inbound_Server(params);
 971                                 }
 972                                 else if (command == "ERROR")
 973                                 {
 974                                         return this->Error(params);
 975                                 }
 976                         break;
 977                         case WAIT_AUTH_2:
 978                                 // Waiting for start of other side's netmerge to say they liked our
 979                                 // password.
 980                                 if (command == "SERVER")
 981                                 {
 982                                         // cant do this, they sent it to us in the WAIT_AUTH_1 state!
 983                                         // silently ignore.
 984                                         return true;
 985                                 }
 986                                 else if (command == "BURST")
 987                                 {
 988                                         this->LinkState = CONNECTED;
 989                                         Node = new TreeServer(InboundServerName,InboundDescription,TreeRoot,this);
 990                                         TreeRoot->AddChild(Node);
 991                                         params.clear();
 992                                         params.push_back(InboundServerName);
 993                                         params.push_back("*");
 994                                         params.push_back("1");
 995                                         params.push_back(":"+InboundDescription);
 996                                         DoOneToAllButSender(TreeRoot->GetName(),"SERVER",params,InboundServerName);
 997                                         this->DoBurst(Node);
 998                                 }
 999                                 else if (command == "ERROR")
1000                                 {
1001                                         return this->Error(params);
1002                                 }
1003
1004                         break;
1005                         case LISTENER:
1006                                 this->WriteLine("ERROR :Internal error -- listening socket accepted its own descriptor!!!");
1007                                 return false;
1008                         break;
1009                         case CONNECTING:
1010                                 if (command == "SERVER")
1011                                 {
1012                                         // another server we connected to, which was in WAIT_AUTH_1 state,
1013                                         // has just sent us their credentials. If we get this far, theyre
1014                                         // happy with OUR credentials, and they are now in WAIT_AUTH_2 state.
1015                                         // if we're happy with this, we should send our netburst which
1016                                         // kickstarts the merge.
1017                                         return this->Outbound_Reply_Server(params);
1018                                 }
1019                                 else if (command == "ERROR")
1020                                 {
1021                                         return this->Error(params);
1022                                 }
1023                         break;
1024                         case CONNECTED:
1025                                 // This is the 'authenticated' state, when all passwords
1026                                 // have been exchanged and anything past this point is taken
1027                                 // as gospel.
1028                                 std::string target = "";
1029                                 if ((command == "NICK") && (params.size() > 1))
1030                                 {
1031                                         return this->IntroduceClient(prefix,params);
1032                                 }
1033                                 else if (command == "FJOIN")
1034                                 {
1035                                         return this->ForceJoin(prefix,params);
1036                                 }
1037                                 else if (command == "SERVER")
1038                                 {
1039                                         return this->RemoteServer(prefix,params);
1040                                 }
1041                                 else if (command == "ERROR")
1042                                 {
1043                                         return this->Error(params);
1044                                 }
1045                                 else if (command == "OPERTYPE")
1046                                 {
1047                                         return this->OperType(prefix,params);
1048                                 }
1049                                 else if (command == "FMODE")
1050                                 {
1051                                         return this->ForceMode(prefix,params);
1052                                 }
1053                                 else if (command == "KILL")
1054                                 {
1055                                         return this->RemoteKill(prefix,params);
1056                                 }
1057                                 else if (command == "FTOPIC")
1058                                 {
1059                                         return this->ForceTopic(prefix,params);
1060                                 }
1061                                 else if (command == "REHASH")
1062                                 {
1063                                         return this->RemoteRehash(prefix,params);
1064                                 }
1065                                 else if (command == "SQUIT")
1066                                 {
1067                                         if (params.size() == 2)
1068                                         {
1069                                                 this->Squit(FindServer(params[0]),params[1]);
1070                                         }
1071                                         return true;
1072                                 }
1073                                 else
1074                                 {
1075                                         // not a special inter-server command.
1076                                         // Emulate the actual user doing the command,
1077                                         // this saves us having a huge ugly parser.
1078                                         userrec* who = Srv->FindNick(prefix);
1079                                         std::string sourceserv = this->myhost;
1080                                         if (this->InboundServerName != "")
1081                                         {
1082                                                 sourceserv = this->InboundServerName;
1083                                         }
1084                                         if (who)
1085                                         {
1086                                                 // its a user
1087                                                 target = who->server;
1088                                                 char* strparams[127];
1089                                                 for (unsigned int q = 0; q < params.size(); q++)
1090                                                 {
1091                                                         strparams[q] = (char*)params[q].c_str();
1092                                                 }
1093                                                 log(DEBUG,"*** CALL COMMAND HANDLER FOR %s, SOURCE: '%s'",command.c_str(),who->nick);
1094                                                 Srv->CallCommandHandler(command, strparams, params.size(), who);
1095                                         }
1096                                         else
1097                                         {
1098                                                 // its not a user. Its either a server, or somethings screwed up.
1099                                                 if (IsServer(prefix))
1100                                                 {
1101                                                         target = Srv->GetServerName();
1102                                                 }
1103                                                 else
1104                                                 {
1105                                                         log(DEBUG,"Command with unknown origin '%s'",prefix.c_str());
1106                                                         return true;
1107                                                 }
1108                                         }
1109                                         return DoOneToAllButSenderRaw(line,sourceserv);
1110
1111                                 }
1112                                 return true;
1113                         break;
1114                 }
1115                 return true;
1116         }
1117
1118         virtual std::string GetName()
1119         {
1120                 std::string sourceserv = this->myhost;
1121                 if (this->InboundServerName != "")
1122                 {
1123                         sourceserv = this->InboundServerName;
1124                 }
1125                 return sourceserv;
1126         }
1127
1128         virtual void OnTimeout()
1129         {
1130                 if (this->LinkState == CONNECTING)
1131                 {
1132                         Srv->SendOpers("*** CONNECT: Connection to \002"+myhost+"\002 timed out.");
1133                 }
1134         }
1135
1136         virtual void OnClose()
1137         {
1138                 // Connection closed.
1139                 // If the connection is fully up (state CONNECTED)
1140                 // then propogate a netsplit to all peers.
1141                 std::string quitserver = this->myhost;
1142                 if (this->InboundServerName != "")
1143                 {
1144                         quitserver = this->InboundServerName;
1145                 }
1146                 TreeServer* s = FindServer(quitserver);
1147                 if (s)
1148                 {
1149                         Squit(s,"Remote host closed the connection");
1150                 }
1151         }
1152
1153         virtual int OnIncomingConnection(int newsock, char* ip)
1154         {
1155                 TreeSocket* s = new TreeSocket(newsock, ip);
1156                 Srv->AddSocket(s);
1157                 return true;
1158         }
1159 };
1160
1161 bool DoOneToAllButSenderRaw(std::string data,std::string omit)
1162 {
1163         TreeServer* omitroute = BestRouteTo(omit);
1164         for (unsigned int x = 0; x < TreeRoot->ChildCount(); x++)
1165         {
1166                 TreeServer* Route = TreeRoot->GetChild(x);
1167                 if ((Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
1168                 {
1169                         TreeSocket* Sock = Route->GetSocket();
1170                         log(DEBUG,"Sending RAW to %s",Route->GetName().c_str());
1171                         Sock->WriteLine(data);
1172                 }
1173         }
1174         return true;
1175 }
1176
1177 bool DoOneToAllButSender(std::string prefix, std::string command, std::deque<std::string> params, std::string omit)
1178 {
1179         log(DEBUG,"ALLBUTONE: Comes from %s SHOULD NOT go back to %s",prefix.c_str(),omit.c_str());
1180         TreeServer* omitroute = BestRouteTo(omit);
1181         // TODO: Special stuff with privmsg and notice
1182         std::string FullLine = ":" + prefix + " " + command;
1183         for (unsigned int x = 0; x < params.size(); x++)
1184         {
1185                 FullLine = FullLine + " " + params[x];
1186         }
1187         for (unsigned int x = 0; x < TreeRoot->ChildCount(); x++)
1188         {
1189                 TreeServer* Route = TreeRoot->GetChild(x);
1190                 // Send the line IF:
1191                 // The route has a socket (its a direct connection)
1192                 // The route isnt the one to be omitted
1193                 // The route isnt the path to the one to be omitted
1194                 if ((Route->GetSocket()) && (Route->GetName() != omit) && (omitroute != Route))
1195                 {
1196                         TreeSocket* Sock = Route->GetSocket();
1197                         log(DEBUG,"Sending to %s",Route->GetName().c_str());
1198                         Sock->WriteLine(FullLine);
1199                 }
1200         }
1201         return true;
1202 }
1203
1204 bool DoOneToMany(std::string prefix, std::string command, std::deque<std::string> params)
1205 {
1206         Srv->Log(DEBUG,"ONETOMANY: "+command);
1207         std::string FullLine = ":" + prefix + " " + command;
1208         for (unsigned int x = 0; x < params.size(); x++)
1209         {
1210                 FullLine = FullLine + " " + params[x];
1211         }
1212         for (unsigned int x = 0; x < TreeRoot->ChildCount(); x++)
1213         {
1214                 TreeServer* Route = TreeRoot->GetChild(x);
1215                 if (Route->GetSocket())
1216                 {
1217                         TreeSocket* Sock = Route->GetSocket();
1218                         Sock->WriteLine(FullLine);
1219                 }
1220         }
1221         return true;
1222 }
1223
1224 bool DoOneToOne(std::string prefix, std::string command, std::deque<std::string> params, std::string target)
1225 {
1226         TreeServer* Route = BestRouteTo(target);
1227         if (Route)
1228         {
1229                 std::string FullLine = ":" + prefix + " " + command;
1230                 for (unsigned int x = 0; x < params.size(); x++)
1231                 {
1232                         FullLine = FullLine + " " + params[x];
1233                 }
1234                 if (Route->GetSocket())
1235                 {
1236                         TreeSocket* Sock = Route->GetSocket();
1237                         Sock->WriteLine(FullLine);
1238                 }
1239                 return true;
1240         }
1241         else
1242         {
1243                 log(DEBUG,"Could not route message with target %s: %s",target.c_str(),command.c_str());
1244                 return true;
1245         }
1246 }
1247
1248 std::vector<TreeSocket*> Bindings;
1249
1250 void ReadConfiguration(bool rebind)
1251 {
1252         if (rebind)
1253         {
1254                 for (int j =0; j < Conf->Enumerate("bind"); j++)
1255                 {
1256                         std::string Type = Conf->ReadValue("bind","type",j);
1257                         std::string IP = Conf->ReadValue("bind","address",j);
1258                         long Port = Conf->ReadInteger("bind","port",j,true);
1259                         if (Type == "servers")
1260                         {
1261                                 if (IP == "*")
1262                                 {
1263                                         IP = "";
1264                                 }
1265                                 TreeSocket* listener = new TreeSocket(IP.c_str(),Port,true,10);
1266                                 if (listener->GetState() == I_LISTENING)
1267                                 {
1268                                         Srv->AddSocket(listener);
1269                                         Bindings.push_back(listener);
1270                                 }
1271                                 else
1272                                 {
1273                                         log(DEFAULT,"m_spanningtree: Warning: Failed to bind server port %d",Port);
1274                                         listener->Close();
1275                                         delete listener;
1276                                 }
1277                         }
1278                 }
1279         }
1280         LinkBlocks.clear();
1281         for (int j =0; j < Conf->Enumerate("link"); j++)
1282         {
1283                 Link L;
1284                 L.Name = Conf->ReadValue("link","name",j);
1285                 L.IPAddr = Conf->ReadValue("link","ipaddr",j);
1286                 L.Port = Conf->ReadInteger("link","port",j,true);
1287                 L.SendPass = Conf->ReadValue("link","sendpass",j);
1288                 L.RecvPass = Conf->ReadValue("link","recvpass",j);
1289                 LinkBlocks.push_back(L);
1290                 log(DEBUG,"m_spanningtree: Read server %s with host %s:%d",L.Name.c_str(),L.IPAddr.c_str(),L.Port);
1291         }
1292 }
1293
1294
1295 class ModuleSpanningTree : public Module
1296 {
1297         std::vector<TreeSocket*> Bindings;
1298         int line;
1299
1300  public:
1301
1302         ModuleSpanningTree()
1303         {
1304                 Srv = new Server;
1305                 Conf = new ConfigReader;
1306                 Bindings.clear();
1307
1308                 // Create the root of the tree
1309                 TreeRoot = new TreeServer(Srv->GetServerName(),Srv->GetServerDescription());
1310
1311                 ReadConfiguration(true);
1312         }
1313
1314         void ShowLinks(TreeServer* Current, userrec* user, int hops)
1315         {
1316                 std::string Parent = TreeRoot->GetName();
1317                 if (Current->GetParent())
1318                 {
1319                         Parent = Current->GetParent()->GetName();
1320                 }
1321                 for (unsigned int q = 0; q < Current->ChildCount(); q++)
1322                 {
1323                         ShowLinks(Current->GetChild(q),user,hops+1);
1324                 }
1325                 WriteServ(user->fd,"364 %s %s %s :%d %s",user->nick,Current->GetName().c_str(),Parent.c_str(),hops,Current->GetDesc().c_str());
1326         }
1327
1328         void HandleLinks(char** parameters, int pcnt, userrec* user)
1329         {
1330                 ShowLinks(TreeRoot,user,0);
1331                 WriteServ(user->fd,"365 %s * :End of /LINKS list.",user->nick);
1332                 return;
1333         }
1334
1335         void HandleLusers(char** parameters, int pcnt, userrec* user)
1336         {
1337                 return;
1338         }
1339
1340         // WARNING: NOT THREAD SAFE - DONT GET ANY SMART IDEAS.
1341
1342         void ShowMap(TreeServer* Current, userrec* user, int depth, char matrix[128][80])
1343         {
1344                 if (line < 128)
1345                 {
1346                         for (int t = 0; t < depth; t++)
1347                         {
1348                                 matrix[line][t] = ' ';
1349                         }
1350                         strlcpy(&matrix[line][depth],Current->GetName().c_str(),80);
1351                         line++;
1352                         for (unsigned int q = 0; q < Current->ChildCount(); q++)
1353                         {
1354                                 ShowMap(Current->GetChild(q),user,depth+2,matrix);
1355                         }
1356                 }
1357         }
1358
1359         // Ok, prepare to be confused.
1360         // After much mulling over how to approach this, it struck me that
1361         // the 'usual' way of doing a /MAP isnt the best way. Instead of
1362         // keeping track of a ton of ascii characters, and line by line
1363         // under recursion working out where to place them using multiplications
1364         // and divisons, we instead render the map onto a backplane of characters
1365         // (a character matrix), then draw the branches as a series of "L" shapes
1366         // from the nodes. This is not only friendlier on CPU it uses less stack.
1367
1368         void HandleMap(char** parameters, int pcnt, userrec* user)
1369         {
1370                 // This array represents a virtual screen which we will
1371                 // "scratch" draw to, as the console device of an irc
1372                 // client does not provide for a proper terminal.
1373                 char matrix[128][80];
1374                 for (unsigned int t = 0; t < 128; t++)
1375                 {
1376                         matrix[t][0] = '\0';
1377                 }
1378                 line = 0;
1379                 // The only recursive bit is called here.
1380                 ShowMap(TreeRoot,user,0,matrix);
1381                 // Process each line one by one. The algorithm has a limit of
1382                 // 128 servers (which is far more than a spanning tree should have
1383                 // anyway, so we're ok). This limit can be raised simply by making
1384                 // the character matrix deeper, 128 rows taking 10k of memory.
1385                 for (int l = 1; l < line; l++)
1386                 {
1387                         // scan across the line looking for the start of the
1388                         // servername (the recursive part of the algorithm has placed
1389                         // the servers at indented positions depending on what they
1390                         // are related to)
1391                         int first_nonspace = 0;
1392                         while (matrix[l][first_nonspace] == ' ')
1393                         {
1394                                 first_nonspace++;
1395                         }
1396                         first_nonspace--;
1397                         // Draw the `- (corner) section: this may be overwritten by
1398                         // another L shape passing along the same vertical pane, becoming
1399                         // a |- (branch) section instead.
1400                         matrix[l][first_nonspace] = '-';
1401                         matrix[l][first_nonspace-1] = '`';
1402                         int l2 = l - 1;
1403                         // Draw upwards until we hit the parent server, causing possibly
1404                         // other corners (`-) to become branches (|-)
1405                         while ((matrix[l2][first_nonspace-1] == ' ') || (matrix[l2][first_nonspace-1] == '`'))
1406                         {
1407                                 matrix[l2][first_nonspace-1] = '|';
1408                                 l2--;
1409                         }
1410                 }
1411                 // dump the whole lot to the user. This is the easy bit, honest.
1412                 for (int t = 0; t < line; t++)
1413                 {
1414                         WriteServ(user->fd,"006 %s :%s",user->nick,&matrix[t][0]);
1415                 }
1416                 WriteServ(user->fd,"007 %s :End of /MAP",user->nick);
1417                 return;
1418         }
1419
1420         int HandleSquit(char** parameters, int pcnt, userrec* user)
1421         {
1422                 return 1;
1423         }
1424
1425         int HandleConnect(char** parameters, int pcnt, userrec* user)
1426         {
1427                 for (std::vector<Link>::iterator x = LinkBlocks.begin(); x < LinkBlocks.end(); x++)
1428                 {
1429                         if (Srv->MatchText(x->Name.c_str(),parameters[0]))
1430                         {
1431                                 WriteServ(user->fd,"NOTICE %s :*** CONNECT: Connecting to server: %s (%s:%d)",user->nick,x->Name.c_str(),x->IPAddr.c_str(),x->Port);
1432                                 TreeSocket* newsocket = new TreeSocket(x->IPAddr,x->Port,false,10,x->Name);
1433                                 Srv->AddSocket(newsocket);
1434                                 return 1;
1435                         }
1436                 }
1437                 WriteServ(user->fd,"NOTICE %s :*** CONNECT: No matching server could be found in the config file.",user->nick);
1438                 return 1;
1439         }
1440
1441         virtual int OnPreCommand(std::string command, char **parameters, int pcnt, userrec *user)
1442         {
1443                 if (command == "CONNECT")
1444                 {
1445                         return this->HandleConnect(parameters,pcnt,user);
1446                 }
1447                 else if (command == "SQUIT")
1448                 {
1449                         return this->HandleSquit(parameters,pcnt,user);
1450                 }
1451                 else if (command == "MAP")
1452                 {
1453                         this->HandleMap(parameters,pcnt,user);
1454                         return 1;
1455                 }
1456                 else if (command == "LUSERS")
1457                 {
1458                         this->HandleLusers(parameters,pcnt,user);
1459                         return 1;
1460                 }
1461                 else if (command == "LINKS")
1462                 {
1463                         this->HandleLinks(parameters,pcnt,user);
1464                         return 1;
1465                 }
1466                 else if (Srv->IsValidModuleCommand(command, pcnt, user))
1467                 {
1468                         // this bit of code cleverly routes all module commands
1469                         // to all remote severs *automatically* so that modules
1470                         // can just handle commands locally, without having
1471                         // to have any special provision in place for remote
1472                         // commands and linking protocols.
1473                         std::deque<std::string> params;
1474                         params.clear();
1475                         for (int j = 0; j < pcnt; j++)
1476                         {
1477                                 if (strchr(parameters[j],' '))
1478                                 {
1479                                         params.push_back(":" + std::string(parameters[j]));
1480                                 }
1481                                 else
1482                                 {
1483                                         params.push_back(std::string(parameters[j]));
1484                                 }
1485                         }
1486                         DoOneToMany(user->nick,command,params);
1487                 }
1488                 return 0;
1489         }
1490
1491         virtual void OnGetServerDescription(std::string servername,std::string &description)
1492         {
1493                 TreeServer* s = FindServer(servername);
1494                 if (s)
1495                 {
1496                         description = s->GetDesc();
1497                 }
1498         }
1499
1500         virtual void OnUserInvite(userrec* source,userrec* dest,chanrec* channel)
1501         {
1502                 if (std::string(source->server) == Srv->GetServerName())
1503                 {
1504                         std::deque<std::string> params;
1505                         params.push_back(dest->nick);
1506                         params.push_back(channel->name);
1507                         DoOneToMany(source->nick,"INVITE",params);
1508                 }
1509         }
1510
1511         virtual void OnPostLocalTopicChange(userrec* user, chanrec* chan, std::string topic)
1512         {
1513                 std::deque<std::string> params;
1514                 params.push_back(chan->name);
1515                 params.push_back(":"+topic);
1516                 DoOneToMany(user->nick,"TOPIC",params);
1517         }
1518
1519         virtual void OnUserNotice(userrec* user, void* dest, int target_type, std::string text)
1520         {
1521                 if (target_type == TYPE_USER)
1522                 {
1523                         userrec* d = (userrec*)dest;
1524                         if ((std::string(d->server) != Srv->GetServerName()) && (std::string(user->server) == Srv->GetServerName()))
1525                         {
1526                                 std::deque<std::string> params;
1527                                 params.clear();
1528                                 params.push_back(d->nick);
1529                                 params.push_back(":"+text);
1530                                 DoOneToOne(user->nick,"NOTICE",params,d->server);
1531                         }
1532                 }
1533                 else
1534                 {
1535                         if (std::string(user->server) == Srv->GetServerName())
1536                         {
1537                                 chanrec *c = (chanrec*)dest;
1538                                 std::deque<std::string> params;
1539                                 params.push_back(c->name);
1540                                 params.push_back(":"+text);
1541                                 DoOneToMany(user->nick,"NOTICE",params);
1542                         }
1543                 }
1544         }
1545
1546         virtual void OnUserMessage(userrec* user, void* dest, int target_type, std::string text)
1547         {
1548                 if (target_type == TYPE_USER)
1549                 {
1550                         // route private messages which are targetted at clients only to the server
1551                         // which needs to receive them
1552                         userrec* d = (userrec*)dest;
1553                         if ((std::string(d->server) != Srv->GetServerName()) && (std::string(user->server) == Srv->GetServerName()))
1554                         {
1555                                 std::deque<std::string> params;
1556                                 params.clear();
1557                                 params.push_back(d->nick);
1558                                 params.push_back(":"+text);
1559                                 DoOneToOne(user->nick,"PRIVMSG",params,d->server);
1560                         }
1561                 }
1562                 else
1563                 {
1564                         if (std::string(user->server) == Srv->GetServerName())
1565                         {
1566                                 chanrec *c = (chanrec*)dest;
1567                                 std::deque<std::string> params;
1568                                 params.push_back(c->name);
1569                                 params.push_back(":"+text);
1570                                 DoOneToMany(user->nick,"PRIVMSG",params);
1571                         }
1572                 }
1573         }
1574
1575         virtual void OnUserJoin(userrec* user, chanrec* channel)
1576         {
1577                 // Only do this for local users
1578                 if (std::string(user->server) == Srv->GetServerName())
1579                 {
1580                         log(DEBUG,"**** User on %s JOINS %s",user->server,channel->name);
1581                         std::deque<std::string> params;
1582                         params.clear();
1583                         params.push_back(channel->name);
1584                         if (*channel->key)
1585                         {
1586                                 log(DEBUG,"**** With key %s",channel->key);
1587                                 // if the channel has a key, force the join by emulating the key.
1588                                 params.push_back(channel->key);
1589                         }
1590                         DoOneToMany(user->nick,"JOIN",params);
1591                 }
1592         }
1593
1594         virtual void OnUserPart(userrec* user, chanrec* channel)
1595         {
1596                 if (std::string(user->server) == Srv->GetServerName())
1597                 {
1598                         log(DEBUG,"**** User on %s PARTS %s",user->server,channel->name);
1599                         std::deque<std::string> params;
1600                         params.clear();
1601                         params.push_back(channel->name);
1602                         DoOneToMany(user->nick,"PART",params);
1603                 }
1604         }
1605
1606         virtual void OnUserConnect(userrec* user)
1607         {
1608                 char agestr[MAXBUF];
1609                 if (std::string(user->server) == Srv->GetServerName())
1610                 {
1611                         log(DEBUG,"**** User on %s CONNECTS: %s",user->server,user->nick);
1612                         std::deque<std::string> params;
1613                         snprintf(agestr,MAXBUF,"%lu",(unsigned long)user->age);
1614                         params.clear();
1615                         params.push_back(agestr);
1616                         params.push_back(user->nick);
1617                         params.push_back(user->host);
1618                         params.push_back(user->dhost);
1619                         params.push_back(user->ident);
1620                         params.push_back("+"+std::string(user->modes));
1621                         params.push_back(user->ip);
1622                         params.push_back(":"+std::string(user->fullname));
1623                         DoOneToMany(Srv->GetServerName(),"NICK",params);
1624                 }
1625         }
1626
1627         virtual void OnUserQuit(userrec* user, std::string reason)
1628         {
1629                 if (std::string(user->server) == Srv->GetServerName())
1630                 {
1631                         log(DEBUG,"**** User on %s QUITS: %s",user->server,user->nick);
1632                         std::deque<std::string> params;
1633                         params.push_back(":"+reason);
1634                         DoOneToMany(user->nick,"QUIT",params);
1635                 }
1636         }
1637
1638         virtual void OnUserPostNick(userrec* user, std::string oldnick)
1639         {
1640                 if (std::string(user->server) == Srv->GetServerName())
1641                 {
1642                         log(DEBUG,"**** User on %s changes NICK: %s",user->server,user->nick);
1643                         std::deque<std::string> params;
1644                         params.push_back(user->nick);
1645                         DoOneToMany(oldnick,"NICK",params);
1646                 }
1647         }
1648
1649         virtual void OnUserKick(userrec* source, userrec* user, chanrec* chan, std::string reason)
1650         {
1651                 if (std::string(source->server) == Srv->GetServerName())
1652                 {
1653                         log(DEBUG,"**** User on %s KICKs: %s %s",source->server,source->nick,user->nick);
1654                         std::deque<std::string> params;
1655                         params.push_back(chan->name);
1656                         params.push_back(user->nick);
1657                         params.push_back(":"+reason);
1658                         DoOneToMany(source->nick,"KICK",params);
1659                 }
1660         }
1661
1662         virtual void OnRemoteKill(userrec* source, userrec* dest, std::string reason)
1663         {
1664                 std::deque<std::string> params;
1665                 params.push_back(dest->nick);
1666                 params.push_back(":"+reason);
1667                 DoOneToMany(source->nick,"KILL",params);
1668         }
1669
1670         virtual void OnRehash(std::string parameter)
1671         {
1672                 if (parameter != "")
1673                 {
1674                         std::deque<std::string> params;
1675                         params.push_back(parameter);
1676                         DoOneToMany(Srv->GetServerName(),"REHASH",params);
1677                         // check for self
1678                         if (Srv->MatchText(Srv->GetServerName(),parameter))
1679                         {
1680                                 Srv->SendOpers("*** Remote rehash initiated from server \002"+Srv->GetServerName()+"\002.");
1681                                 Srv->RehashServer();
1682                         }
1683                 }
1684                 ReadConfiguration(false);
1685         }
1686
1687         // note: the protocol does not allow direct umode +o except
1688         // via NICK with 8 params. sending OPERTYPE infers +o modechange
1689         // locally.
1690         virtual void OnOper(userrec* user, std::string opertype)
1691         {
1692                 if (std::string(user->server) == Srv->GetServerName())
1693                 {
1694                         std::deque<std::string> params;
1695                         params.push_back(opertype);
1696                         DoOneToMany(user->nick,"OPERTYPE",params);
1697                 }
1698         }
1699
1700         virtual void OnMode(userrec* user, void* dest, int target_type, std::string text)
1701         {
1702                 log(DEBUG,"*** ONMODE TRIGGER");
1703                 if (std::string(user->server) == Srv->GetServerName())
1704                 {
1705                         log(DEBUG,"*** LOCAL");
1706                         if (target_type == TYPE_USER)
1707                         {
1708                                 userrec* u = (userrec*)dest;
1709                                 std::deque<std::string> params;
1710                                 params.push_back(u->nick);
1711                                 params.push_back(text);
1712                                 DoOneToMany(user->nick,"MODE",params);
1713                         }
1714                         else
1715                         {
1716                                 chanrec* c = (chanrec*)dest;
1717                                 std::deque<std::string> params;
1718                                 params.push_back(c->name);
1719                                 params.push_back(text);
1720                                 DoOneToMany(user->nick,"MODE",params);
1721                         }
1722                 }
1723         }
1724
1725         virtual void ProtoSendMode(void* opaque, int target_type, void* target, std::string modeline)
1726         {
1727                 TreeSocket* s = (TreeSocket*)opaque;
1728                 if (target)
1729                 {
1730                         if (target_type == TYPE_USER)
1731                         {
1732                                 userrec* u = (userrec*)target;
1733                                 s->WriteLine(":"+Srv->GetServerName()+" FMODE "+u->nick+" "+modeline);
1734                         }
1735                         else
1736                         {
1737                                 chanrec* c = (chanrec*)target;
1738                                 s->WriteLine(":"+Srv->GetServerName()+" FMODE "+c->name+" "+modeline);
1739                         }
1740                 }
1741         }
1742
1743         virtual ~ModuleSpanningTree()
1744         {
1745                 delete Srv;
1746         }
1747
1748         virtual Version GetVersion()
1749         {
1750                 return Version(1,0,0,0,VF_STATIC|VF_VENDOR);
1751         }
1752 };
1753
1754
1755 class ModuleSpanningTreeFactory : public ModuleFactory
1756 {
1757  public:
1758         ModuleSpanningTreeFactory()
1759         {
1760         }
1761
1762         ~ModuleSpanningTreeFactory()
1763         {
1764         }
1765
1766         virtual Module * CreateModule()
1767         {
1768                 TreeProtocolModule = new ModuleSpanningTree;
1769                 return TreeProtocolModule;
1770         }
1771
1772 };
1773
1774
1775 extern "C" void * init_module( void )
1776 {
1777         return new ModuleSpanningTreeFactory;
1778 }
1779