src/modules/m_spanningtree/treesocket2.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "configreader.h"
  16 #include "users.h"
  17 #include "channels.h"
  18 #include "modules.h"
  19 #include "commands/cmd_whois.h"
  20 #include "commands/cmd_stats.h"
  21 #include "socket.h"
  22 #include "wildcard.h"
  23 #include "xline.h"
  24 #include "transport.h"
  25 #include "socketengine.h"
  26
  27 #include "m_spanningtree/main.h"
  28 #include "m_spanningtree/utils.h"
  29 #include "m_spanningtree/treeserver.h"
  30 #include "m_spanningtree/link.h"
  31 #include "m_spanningtree/treesocket.h"
  32 #include "m_spanningtree/resolvers.h"
  33 #include "m_spanningtree/handshaketimer.h"
  34
  35 /* $ModDep: m_spanningtree/timesynctimer.h m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h */
  36
  37 static std::map<std::string, std::string> warned;       /* Server names that have had protocol violation warnings displayed for them */
  38
  39 int TreeSocket::WriteLine(std::string line)
  40 {
  41         Instance->Log(DEBUG, "S[%d] -> %s", this->GetFd(), line.c_str());
  42         line.append("\r\n");
  43         return this->Write(line);
  44 }
  45
  46
  47 /* Handle ERROR command */
  48 bool TreeSocket::Error(std::deque<std::string> &params)
  49 {
  50         if (params.size() < 1)
  51                 return false;
  52         this->Instance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(InboundServerName != "" ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
  53         /* we will return false to cause the socket to close. */
  54         return false;
  55 }
  56
  57 bool TreeSocket::Modules(const std::string &prefix, std::deque<std::string> &params)
  58 {
  59         if (params.empty())
  60                 return true;
  61
  62         if (!this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
  63         {
  64                 /* Pass it on, not for us */
  65                 Utils->DoOneToOne(prefix, "MODULES", params, params[0]);
  66                 return true;
  67         }
  68
  69         char strbuf[MAXBUF];
  70         std::deque<std::string> par;
  71         par.push_back(prefix);
  72         par.push_back("");
  73
  74         userrec* source = this->Instance->FindNick(prefix);
  75         if (!source)
  76                 return true;
  77
  78         for (unsigned int i = 0; i < Instance->Config->module_names.size(); i++)
  79         {
  80                 Version V = Instance->modules[i]->GetVersion();
  81                 char modulename[MAXBUF];
  82                 char flagstate[MAXBUF];
  83                 *flagstate = 0;
  84                 if (V.Flags & VF_STATIC)
  85                         strlcat(flagstate,", static",MAXBUF);
  86                 if (V.Flags & VF_VENDOR)
  87                         strlcat(flagstate,", vendor",MAXBUF);
  88                 if (V.Flags & VF_COMMON)
  89                         strlcat(flagstate,", common",MAXBUF);
  90                 if (V.Flags & VF_SERVICEPROVIDER)
  91                         strlcat(flagstate,", service provider",MAXBUF);
  92                 if (!flagstate[0])
  93                         strcpy(flagstate,"  <no flags>");
  94                 strlcpy(modulename,Instance->Config->module_names[i].c_str(),256);
  95                 if (*source->oper)
  96                 {
  97                         snprintf(strbuf, MAXBUF, "::%s 900 %s :0x%08lx %d.%d.%d.%d %s (%s)",Instance->Config->ServerName,source->nick,(long unsigned int)Instance->modules[i],V.Major,V.Minor,V.Revision,V.Build,ServerConfig::CleanFilename(modulename),flagstate+2);
  98                 }
  99                 else
 100                 {
 101                         snprintf(strbuf, MAXBUF, "::%s 900 %s :%s",Instance->Config->ServerName,source->nick,ServerConfig::CleanFilename(modulename));
 102                 }
 103                 par[1] = strbuf;
 104                 Utils->DoOneToOne(Instance->Config->ServerName, "PUSH", par, source->server);
 105         }
 106         snprintf(strbuf, MAXBUF, "::%s 901 %s :End of MODULES list", Instance->Config->ServerName, source->nick);
 107         par[1] = strbuf;
 108         Utils->DoOneToOne(Instance->Config->ServerName, "PUSH", par, source->server);
 109         return true;
 110 }
 111
 112 /** remote MOTD. leet, huh? */
 113 bool TreeSocket::Motd(const std::string &prefix, std::deque<std::string> &params)
 114 {
 115         if (params.size() > 0)
 116         {
 117                 if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
 118                 {
 119                         /* It's for our server */
 120                         string_list results;
 121                         userrec* source = this->Instance->FindNick(prefix);
 122
 123                         if (source)
 124                         {
 125                                 std::deque<std::string> par;
 126                                 par.push_back(prefix);
 127                                 par.push_back("");
 128
 129                                 if (!Instance->Config->MOTD.size())
 130                                 {
 131                                         par[1] = std::string("::")+Instance->Config->ServerName+" 422 "+source->nick+" :Message of the day file is missing.";
 132                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 133                                         return true;
 134                                 }
 135
 136                                 par[1] = std::string("::")+Instance->Config->ServerName+" 375 "+source->nick+" :"+Instance->Config->ServerName+" message of the day";
 137                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 138
 139                                 for (unsigned int i = 0; i < Instance->Config->MOTD.size(); i++)
 140                                 {
 141                                         par[1] = std::string("::")+Instance->Config->ServerName+" 372 "+source->nick+" :- "+Instance->Config->MOTD[i];
 142                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 143                                 }
 144
 145                                 par[1] = std::string("::")+Instance->Config->ServerName+" 376 "+source->nick+" End of message of the day.";
 146                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 147                         }
 148                 }
 149                 else
 150                 {
 151                         /* Pass it on */
 152                         userrec* source = this->Instance->FindNick(prefix);
 153                         if (source)
 154                                 Utils->DoOneToOne(prefix, "MOTD", params, params[0]);
 155                 }
 156         }
 157         return true;
 158 }
 159
 160 /** remote ADMIN. leet, huh? */
 161 bool TreeSocket::Admin(const std::string &prefix, std::deque<std::string> &params)
 162 {
 163         if (params.size() > 0)
 164         {
 165                 if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
 166                 {
 167                         /* It's for our server */
 168                         string_list results;
 169                         userrec* source = this->Instance->FindNick(prefix);
 170                         if (source)
 171                         {
 172                                 std::deque<std::string> par;
 173                                 par.push_back(prefix);
 174                                 par.push_back("");
 175                                 par[1] = std::string("::")+Instance->Config->ServerName+" 256 "+source->nick+" :Administrative info for "+Instance->Config->ServerName;
 176                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 177                                 par[1] = std::string("::")+Instance->Config->ServerName+" 257 "+source->nick+" :Name     - "+Instance->Config->AdminName;
 178                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 179                                 par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :Nickname - "+Instance->Config->AdminNick;
 180                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 181                                 par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :E-Mail   - "+Instance->Config->AdminEmail;
 182                                 Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 183                         }
 184                 }
 185                 else
 186                 {
 187                         /* Pass it on */
 188                         userrec* source = this->Instance->FindNick(prefix);
 189                         if (source)
 190                                 Utils->DoOneToOne(prefix, "ADMIN", params, params[0]);
 191                 }
 192         }
 193         return true;
 194 }
 195
 196 bool TreeSocket::Stats(const std::string &prefix, std::deque<std::string> &params)
 197 {
 198         /* Get the reply to a STATS query if it matches this servername,
 199          * and send it back as a load of PUSH queries
 200          */
 201         if (params.size() > 1)
 202         {
 203                 if (this->Instance->MatchText(this->Instance->Config->ServerName, params[1]))
 204                 {
 205                         /* It's for our server */
 206                         string_list results;
 207                         userrec* source = this->Instance->FindNick(prefix);
 208                         if (source)
 209                         {
 210                                 std::deque<std::string> par;
 211                                 par.push_back(prefix);
 212                                 par.push_back("");
 213                                 DoStats(this->Instance, *(params[0].c_str()), source, results);
 214                                 for (size_t i = 0; i < results.size(); i++)
 215                                 {
 216                                         par[1] = "::" + results[i];
 217                                         Utils->DoOneToOne(this->Instance->Config->ServerName, "PUSH",par, source->server);
 218                                 }
 219                         }
 220                 }
 221                 else
 222                 {
 223                         /* Pass it on */
 224                         userrec* source = this->Instance->FindNick(prefix);
 225                         if (source)
 226                                 Utils->DoOneToOne(prefix, "STATS", params, params[1]);
 227                 }
 228         }
 229         return true;
 230 }
 231
 232
 233 /** Because the core won't let users or even SERVERS set +o,
 234  * we use the OPERTYPE command to do this.
 235  */
 236 bool TreeSocket::OperType(const std::string &prefix, std::deque<std::string> &params)
 237 {
 238         if (params.size() != 1)
 239                 return true;
 240         std::string opertype = params[0];
 241         userrec* u = this->Instance->FindNick(prefix);
 242         if (u)
 243         {
 244                 u->modes[UM_OPERATOR] = 1;
 245                 this->Instance->all_opers.push_back(u);
 246                 strlcpy(u->oper,opertype.c_str(),NICKMAX-1);
 247                 Utils->DoOneToAllButSender(u->nick,"OPERTYPE",params,u->server);
 248                 this->Instance->SNO->WriteToSnoMask('o',"From %s: User %s (%s@%s) is now an IRC operator of type %s",u->server, u->nick,u->ident,u->host,irc::Spacify(opertype.c_str()));
 249         }
 250         return true;
 251 }
 252
 253 /** Because Andy insists that services-compatible servers must
 254  * implement SVSNICK and SVSJOIN, that's exactly what we do :p
 255  */
 256 bool TreeSocket::ForceNick(const std::string &prefix, std::deque<std::string> &params)
 257 {
 258         if (params.size() < 3)
 259                 return true;
 260
 261         userrec* u = this->Instance->FindNick(params[0]);
 262
 263         if (u)
 264         {
 265                 Utils->DoOneToAllButSender(prefix,"SVSNICK",params,prefix);
 266                 if (IS_LOCAL(u))
 267                 {
 268                         std::deque<std::string> par;
 269                         par.push_back(params[1]);
 270                         if (!u->ForceNickChange(params[1].c_str()))
 271                         {
 272                                 userrec::QuitUser(this->Instance, u, "Nickname collision");
 273                                 return true;
 274                         }
 275                         u->age = atoi(params[2].c_str());
 276                 }
 277         }
 278         return true;
 279 }
 280
 281 bool TreeSocket::OperQuit(const std::string &prefix, std::deque<std::string> &params)
 282 {
 283         if (params.size() < 1)
 284                 return true;
 285
 286         userrec* u = this->Instance->FindNick(prefix);
 287
 288         if (u)
 289         {
 290                 u->SetOperQuit(params[0]);
 291                 params[0] = ":" + params[0];
 292                 Utils->DoOneToAllButSender(prefix,"OPERQUIT",params,prefix);
 293         }
 294         return true;
 295 }
 296
 297 /*
 298  * Remote SQUIT (RSQUIT). Routing works similar to SVSNICK: Route it to the server that the target is connected to locally,
 299  * then let that server do the dirty work (squit it!). Example:
 300  * A -> B -> C -> D: oper on A squits D, A routes to B, B routes to C, C notices D connected locally, kills it. -- w00t
 301  */
 302 bool TreeSocket::RemoteSquit(const std::string &prefix, std::deque<std::string> &params)
 303 {
 304         /* ok.. :w00t RSQUIT jupe.barafranca.com :reason here */
 305         if (params.size() < 2)
 306                 return true;
 307
 308         TreeServer* s = Utils->FindServerMask(params[0]);
 309
 310         if (s)
 311         {
 312                 if (s == Utils->TreeRoot)
 313                 {
 314                         this->Instance->SNO->WriteToSnoMask('l',"What the fuck, I recieved a remote SQUIT for myself? :< (from %s", prefix.c_str());
 315                         return true;
 316                 }
 317
 318                 TreeSocket* sock = s->GetSocket();
 319
 320                 if (sock)
 321                 {
 322                         /* it's locally connected, KILL IT! */
 323                         Instance->SNO->WriteToSnoMask('l',"RSQUIT: Server \002%s\002 removed from network by %s: %s", params[0].c_str(), prefix.c_str(), params[1].c_str());
 324                         sock->Squit(s,"Server quit by " + prefix + ": " + params[1]);
 325                         Instance->SE->DelFd(sock);
 326                         sock->Close();
 327                         delete sock;
 328                 }
 329                 else
 330                 {
 331                         /* route the rsquit */
 332                         params[1] = ":" + params[1];
 333                         Utils->DoOneToOne(prefix, "RSQUIT", params, params[0]);
 334                 }
 335         }
 336         else
 337         {
 338                 /* mother fucker! it doesn't exist */
 339         }
 340
 341         return true;
 342 }
 343
 344 bool TreeSocket::ServiceJoin(const std::string &prefix, std::deque<std::string> &params)
 345 {
 346         if (params.size() < 2)
 347                 return true;
 348
 349         userrec* u = this->Instance->FindNick(params[0]);
 350
 351         if (u)
 352         {
 353                 /* only join if it's local, otherwise just pass it on! */
 354                 if (IS_LOCAL(u))
 355                         chanrec::JoinUser(this->Instance, u, params[1].c_str(), false, "", Instance->Time());
 356                 Utils->DoOneToAllButSender(prefix,"SVSJOIN",params,prefix);
 357         }
 358         return true;
 359 }
 360
 361 bool TreeSocket::RemoteRehash(const std::string &prefix, std::deque<std::string> &params)
 362 {
 363         if (params.size() < 1)
 364                 return false;
 365
 366         std::string servermask = params[0];
 367
 368         if (this->Instance->MatchText(this->Instance->Config->ServerName,servermask))
 369         {
 370                 this->Instance->SNO->WriteToSnoMask('l',"Remote rehash initiated by \002"+prefix+"\002.");
 371                 this->Instance->RehashServer();
 372                 Utils->ReadConfiguration(false);
 373                 InitializeDisabledCommands(Instance->Config->DisabledCommands, Instance);
 374         }
 375         Utils->DoOneToAllButSender(prefix,"REHASH",params,prefix);
 376         return true;
 377 }
 378
 379 bool TreeSocket::LocalPong(const std::string &prefix, std::deque<std::string> &params)
 380 {
 381         if (params.size() < 1)
 382                 return true;
 383
 384         if (params.size() == 1)
 385         {
 386                 TreeServer* ServerSource = Utils->FindServer(prefix);
 387                 if (ServerSource)
 388                 {
 389                         ServerSource->SetPingFlag();
 390                         ServerSource->rtt = Instance->Time() - ServerSource->LastPing;
 391                 }
 392         }
 393         else
 394         {
 395                 std::string forwardto = params[1];
 396                 if (forwardto == this->Instance->Config->ServerName)
 397                 {
 398                         /*
 399                          * this is a PONG for us
 400                          * if the prefix is a user, check theyre local, and if they are,
 401                          * dump the PONG reply back to their fd. If its a server, do nowt.
 402                          * Services might want to send these s->s, but we dont need to yet.
 403                          */
 404                         userrec* u = this->Instance->FindNick(prefix);
 405                         if (u)
 406                         {
 407                                 u->WriteServ("PONG %s %s",params[0].c_str(),params[1].c_str());
 408                         }
 409                 }
 410                 else
 411                 {
 412                         // not for us, pass it on :)
 413                         Utils->DoOneToOne(prefix,"PONG",params,forwardto);
 414                 }
 415         }
 416
 417         return true;
 418 }
 419
 420 bool TreeSocket::MetaData(const std::string &prefix, std::deque<std::string> &params)
 421 {
 422         if (params.size() < 2)
 423                 return true;
 424         else if (params.size() < 3)
 425                 params.push_back("");
 426         TreeServer* ServerSource = Utils->FindServer(prefix);
 427         if (ServerSource)
 428         {
 429                 Utils->SetRemoteBursting(ServerSource, false);
 430
 431                 if (params[0] == "*")
 432                 {
 433                         FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_OTHER,NULL,params[1],params[2]));
 434                 }
 435                 else if (*(params[0].c_str()) == '#')
 436                 {
 437                         chanrec* c = this->Instance->FindChan(params[0]);
 438                         if (c)
 439                         {
 440                                 FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_CHANNEL,c,params[1],params[2]));
 441                         }
 442                 }
 443                 else if (*(params[0].c_str()) != '#')
 444                 {
 445                         userrec* u = this->Instance->FindNick(params[0]);
 446                         if (u)
 447                         {
 448                                 FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_USER,u,params[1],params[2]));
 449                         }
 450                 }
 451         }
 452
 453         params[2] = ":" + params[2];
 454         Utils->DoOneToAllButSender(prefix,"METADATA",params,prefix);
 455         return true;
 456 }
 457
 458 bool TreeSocket::ServerVersion(const std::string &prefix, std::deque<std::string> &params)
 459 {
 460         if (params.size() < 1)
 461                 return true;
 462
 463         TreeServer* ServerSource = Utils->FindServer(prefix);
 464
 465         if (ServerSource)
 466         {
 467                 ServerSource->SetVersion(params[0]);
 468         }
 469         params[0] = ":" + params[0];
 470         Utils->DoOneToAllButSender(prefix,"VERSION",params,prefix);
 471         return true;
 472 }
 473
 474 bool TreeSocket::ChangeHost(const std::string &prefix, std::deque<std::string> &params)
 475 {
 476         if (params.size() < 1)
 477                 return true;
 478         userrec* u = this->Instance->FindNick(prefix);
 479
 480         if (u)
 481         {
 482                 u->ChangeDisplayedHost(params[0].c_str());
 483                 Utils->DoOneToAllButSender(prefix,"FHOST",params,u->server);
 484         }
 485         return true;
 486 }
 487
 488 bool TreeSocket::AddLine(const std::string &prefix, std::deque<std::string> &params)
 489 {
 490         if (params.size() < 6)
 491                 return true;
 492         bool propogate = false;
 493         if (!this->bursting)
 494                 Utils->lines_to_apply = 0;
 495         switch (*(params[0].c_str()))
 496         {
 497                 case 'Z':
 498                         propogate = Instance->XLines->add_zline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 499                         Instance->XLines->zline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 500                         if (propogate)
 501                                 Utils->lines_to_apply |= APPLY_ZLINES;
 502                 break;
 503                 case 'Q':
 504                         propogate = Instance->XLines->add_qline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 505                         Instance->XLines->qline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 506                         if (propogate)
 507                                 Utils->lines_to_apply |= APPLY_QLINES;
 508                 break;
 509                 case 'E':
 510                         propogate = Instance->XLines->add_eline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 511                         Instance->XLines->eline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 512                 break;
 513                 case 'G':
 514                         propogate = Instance->XLines->add_gline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 515                         Instance->XLines->gline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 516                         if (propogate)
 517                                 Utils->lines_to_apply |= APPLY_GLINES;
 518                 break;
 519                 case 'K':
 520                         propogate = Instance->XLines->add_kline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 521                         if (propogate)
 522                                 Utils->lines_to_apply |= APPLY_KLINES;
 523                 break;
 524                 default:
 525                         /* Just in case... */
 526                         this->Instance->SNO->WriteToSnoMask('x',"\2WARNING\2: Invalid xline type '"+params[0]+"' sent by server "+prefix+", ignored!");
 527                         propogate = false;
 528                 break;
 529         }
 530         /* Send it on its way */
 531         if (propogate)
 532         {
 533                 if (atoi(params[4].c_str()))
 534                 {
 535                         time_t c_requires_crap = ConvToInt(params[4]) + Instance->Time();
 536                         this->Instance->SNO->WriteToSnoMask('x',"%s Added %cLINE on %s to expire on %s (%s).",prefix.c_str(),*(params[0].c_str()),params[1].c_str(),Instance->TimeString(c_requires_crap).c_str(),params[5].c_str());
 537                 }
 538                 else
 539                 {
 540                         this->Instance->SNO->WriteToSnoMask('x',"%s Added permenant %cLINE on %s (%s).",prefix.c_str(),*(params[0].c_str()),params[1].c_str(),params[5].c_str());
 541                 }
 542                 params[5] = ":" + params[5];
 543                 Utils->DoOneToAllButSender(prefix,"ADDLINE",params,prefix);
 544         }
 545         if (!this->bursting)
 546         {
 547                 Instance->XLines->apply_lines(Utils->lines_to_apply);
 548                 Utils->lines_to_apply = 0;
 549         }
 550         return true;
 551 }
 552
 553 bool TreeSocket::ChangeName(const std::string &prefix, std::deque<std::string> &params)
 554 {
 555         if (params.size() < 1)
 556                 return true;
 557         userrec* u = this->Instance->FindNick(prefix);
 558         if (u)
 559         {
 560                 u->ChangeName(params[0].c_str());
 561                 params[0] = ":" + params[0];
 562                 Utils->DoOneToAllButSender(prefix,"FNAME",params,u->server);
 563         }
 564         return true;
 565 }
 566
 567 bool TreeSocket::Whois(const std::string &prefix, std::deque<std::string> &params)
 568 {
 569         if (params.size() < 1)
 570                 return true;
 571         userrec* u = this->Instance->FindNick(prefix);
 572         if (u)
 573         {
 574                 // an incoming request
 575                 if (params.size() == 1)
 576                 {
 577                         userrec* x = this->Instance->FindNick(params[0]);
 578                         if ((x) && (IS_LOCAL(x)))
 579                         {
 580                                 userrec* x = this->Instance->FindNick(params[0]);
 581                                 char signon[MAXBUF];
 582                                 char idle[MAXBUF];
 583                                 snprintf(signon, MAXBUF, "%lu", (unsigned long)x->signon);
 584                                 snprintf(idle, MAXBUF, "%lu", (unsigned long)abs((x->idle_lastmsg) - Instance->Time(true)));
 585                                 std::deque<std::string> par;
 586                                 par.push_back(prefix);
 587                                 par.push_back(signon);
 588                                 par.push_back(idle);
 589                                 // ours, we're done, pass it BACK
 590                                 Utils->DoOneToOne(params[0], "IDLE", par, u->server);
 591                         }
 592                         else
 593                         {
 594                                 // not ours pass it on
 595                                 if (x)
 596                                         Utils->DoOneToOne(prefix, "IDLE", params, x->server);
 597                         }
 598                 }
 599                 else if (params.size() == 3)
 600                 {
 601                         std::string who_did_the_whois = params[0];
 602                         userrec* who_to_send_to = this->Instance->FindNick(who_did_the_whois);
 603                         if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
 604                         {
 605                                 // an incoming reply to a whois we sent out
 606                                 std::string nick_whoised = prefix;
 607                                 unsigned long signon = atoi(params[1].c_str());
 608                                 unsigned long idle = atoi(params[2].c_str());
 609                                 if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
 610                                 {
 611                                         do_whois(this->Instance, who_to_send_to, u, signon, idle, nick_whoised.c_str());
 612                                 }
 613                         }
 614                         else
 615                         {
 616                                 // not ours, pass it on
 617                                 if (who_to_send_to)
 618                                         Utils->DoOneToOne(prefix, "IDLE", params, who_to_send_to->server);
 619                         }
 620                 }
 621         }
 622         return true;
 623 }
 624
 625 bool TreeSocket::Push(const std::string &prefix, std::deque<std::string> &params)
 626 {
 627         if (params.size() < 2)
 628                 return true;
 629         userrec* u = this->Instance->FindNick(params[0]);
 630         if (!u)
 631                 return true;
 632         if (IS_LOCAL(u))
 633         {
 634                 u->Write(params[1]);
 635         }
 636         else
 637         {
 638                 // continue the raw onwards
 639                 params[1] = ":" + params[1];
 640                 Utils->DoOneToOne(prefix,"PUSH",params,u->server);
 641         }
 642         return true;
 643 }
 644
 645 bool TreeSocket::HandleSetTime(const std::string &prefix, std::deque<std::string> &params)
 646 {
 647         if (!params.size() || !Utils->EnableTimeSync)
 648                 return true;
 649
 650         bool force = false;
 651
 652         if ((params.size() == 2) && (params[1] == "FORCE"))
 653                 force = true;
 654
 655         time_t them = atoi(params[0].c_str());
 656         time_t us = Instance->Time(false);
 657
 658         time_t diff = them - us;
 659
 660         Utils->DoOneToAllButSender(prefix, "TIMESET", params, prefix);
 661
 662         if (force || (them != us))
 663         {
 664                 time_t old = Instance->SetTimeDelta(diff);
 665                 Instance->Log(DEBUG, "TS (diff %d) from %s applied (old delta was %d)", diff, prefix.c_str(), old);
 666         }
 667
 668         return true;
 669 }
 670
 671 bool TreeSocket::Time(const std::string &prefix, std::deque<std::string> &params)
 672 {
 673         // :source.server TIME remote.server sendernick
 674         // :remote.server TIME source.server sendernick TS
 675         if (params.size() == 2)
 676         {
 677                 // someone querying our time?
 678                 if (this->Instance->Config->ServerName == params[0])
 679                 {
 680                         userrec* u = this->Instance->FindNick(params[1]);
 681                         if (u)
 682                         {
 683                                 params.push_back(ConvToStr(Instance->Time(false)));
 684                                 params[0] = prefix;
 685                                 Utils->DoOneToOne(this->Instance->Config->ServerName,"TIME",params,params[0]);
 686                         }
 687                 }
 688                 else
 689                 {
 690                         // not us, pass it on
 691                         userrec* u = this->Instance->FindNick(params[1]);
 692                         if (u)
 693                                 Utils->DoOneToOne(prefix,"TIME",params,params[0]);
 694                 }
 695         }
 696         else if (params.size() == 3)
 697         {
 698                 // a response to a previous TIME
 699                 userrec* u = this->Instance->FindNick(params[1]);
 700                 if ((u) && (IS_LOCAL(u)))
 701                 {
 702                         time_t rawtime = atol(params[2].c_str());
 703                         struct tm * timeinfo;
 704                         timeinfo = localtime(&rawtime);
 705                         char tms[26];
 706                         snprintf(tms,26,"%s",asctime(timeinfo));
 707                         tms[24] = 0;
 708                         u->WriteServ("391 %s %s :%s",u->nick,prefix.c_str(),tms);
 709                 }
 710                 else
 711                 {
 712                         if (u)
 713                                 Utils->DoOneToOne(prefix,"TIME",params,u->server);
 714                 }
 715         }
 716         return true;
 717 }
 718
 719 bool TreeSocket::LocalPing(const std::string &prefix, std::deque<std::string> &params)
 720 {
 721         if (params.size() < 1)
 722                 return true;
 723         if (params.size() == 1)
 724         {
 725                 std::string stufftobounce = params[0];
 726                 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" PONG "+stufftobounce);
 727                 return true;
 728         }
 729         else
 730         {
 731                 std::string forwardto = params[1];
 732                 if (forwardto == this->Instance->Config->ServerName)
 733                 {
 734                         // this is a ping for us, send back PONG to the requesting server
 735                         params[1] = params[0];
 736                         params[0] = forwardto;
 737                         Utils->DoOneToOne(forwardto,"PONG",params,params[1]);
 738                 }
 739                 else
 740                 {
 741                         // not for us, pass it on :)
 742                         Utils->DoOneToOne(prefix,"PING",params,forwardto);
 743                 }
 744                 return true;
 745         }
 746 }
 747
 748 /** TODO: This creates a total mess of output and needs to really use irc::modestacker.
 749  */
 750 bool TreeSocket::RemoveStatus(const std::string &prefix, std::deque<std::string> &params)
 751 {
 752         if (params.size() < 1)
 753                 return true;
 754         chanrec* c = Instance->FindChan(params[0]);
 755         if (c)
 756         {
 757                 for (char modeletter = 'A'; modeletter <= 'z'; modeletter++)
 758                 {
 759                         ModeHandler* mh = Instance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
 760                         if (mh)
 761                                 mh->RemoveMode(c);
 762                 }
 763         }
 764         return true;
 765 }
 766
 767 bool TreeSocket::RemoteServer(const std::string &prefix, std::deque<std::string> &params)
 768 {
 769         if (params.size() < 4)
 770                 return false;
 771         std::string servername = params[0];
 772         std::string password = params[1];
 773         // hopcount is not used for a remote server, we calculate this ourselves
 774         std::string description = params[3];
 775         TreeServer* ParentOfThis = Utils->FindServer(prefix);
 776         if (!ParentOfThis)
 777         {
 778                 this->SendError("Protocol error - Introduced remote server from unknown server "+prefix);
 779                 return false;
 780         }
 781         TreeServer* CheckDupe = Utils->FindServer(servername);
 782         if (CheckDupe)
 783         {
 784                 this->SendError("Server "+servername+" already exists!");
 785                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, already exists. Closing link with " + prefix);
 786                 return false;
 787         }
 788         Link* lnk = Utils->FindLink(servername);
 789         TreeServer* Node = new TreeServer(this->Utils,this->Instance,servername,description,ParentOfThis,NULL, lnk ? lnk->Hidden : false);
 790         ParentOfThis->AddChild(Node);
 791         params[3] = ":" + params[3];
 792         Utils->SetRemoteBursting(Node, true);
 793         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
 794         this->Instance->SNO->WriteToSnoMask('l',"Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
 795         return true;
 796 }
 797
 798 bool TreeSocket::ComparePass(const std::string &ours, const std::string &theirs)
 799 {
 800         if ((!strncmp(ours.c_str(), "HMAC-SHA256:", 12)) || (!strncmp(theirs.c_str(), "HMAC-SHA256:", 12)))
 801         {
 802                 /* One or both of us specified hmac sha256, but we don't have sha256 module loaded!
 803                  * We can't allow this password as valid.
 804                  */
 805                 if (!Instance->FindModule("m_sha256.so") || !Utils->ChallengeResponse)
 806                                 return false;
 807                 else
 808                         /* Straight string compare of hashes */
 809                         return ours == theirs;
 810         }
 811         else
 812                 /* Straight string compare of plaintext */
 813                 return ours == theirs;
 814 }
 815
 816 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
 817 {
 818         if (params.size() < 4)
 819                 return false;
 820
 821         irc::string servername = params[0].c_str();
 822         std::string sname = params[0];
 823         std::string password = params[1];
 824         std::string description = params[3];
 825         int hops = atoi(params[2].c_str());
 826
 827         this->InboundServerName = sname;
 828         this->InboundDescription = description;
 829
 830         if (hops)
 831         {
 832                 this->SendError("Server too far away for authentication");
 833                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 834                 return false;
 835         }
 836
 837         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 838         {
 839                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password)) || (x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 840                 {
 841                         TreeServer* CheckDupe = Utils->FindServer(sname);
 842                         if (CheckDupe)
 843                         {
 844                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 845                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 846                                 return false;
 847                         }
 848                         // Begin the sync here. this kickstarts the
 849                         // other side, waiting in WAIT_AUTH_2 state,
 850                         // into starting their burst, as it shows
 851                         // that we're happy.
 852                         this->LinkState = CONNECTED;
 853                         // we should add the details of this server now
 854                         // to the servers tree, as a child of the root
 855                         // node.
 856                         TreeServer* Node = new TreeServer(this->Utils,this->Instance,sname,description,Utils->TreeRoot,this,x->Hidden);
 857                         Utils->TreeRoot->AddChild(Node);
 858                         params[3] = ":" + params[3];
 859                         Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,sname);
 860                         this->bursting = true;
 861                         this->DoBurst(Node);
 862                         return true;
 863                 }
 864         }
 865         this->SendError("Invalid credentials");
 866         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 867         return false;
 868 }
 869
 870 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 871 {
 872         if (params.size() < 4)
 873                 return false;
 874         irc::string servername = params[0].c_str();
 875         std::string sname = params[0];
 876         std::string password = params[1];
 877         std::string description = params[3];
 878         int hops = atoi(params[2].c_str());
 879
 880         this->InboundServerName = sname;
 881         this->InboundDescription = description;
 882
 883         if (hops)
 884         {
 885                 this->SendError("Server too far away for authentication");
 886                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 887                 return false;
 888         }
 889
 890         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 891         {
 892                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password) || x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 893                 {
 894                         /* First check for instances of the server that are waiting between the inbound and outbound SERVER command */
 895                         TreeSocket* CheckDupeSocket = Utils->FindBurstingServer(sname);
 896                         if (CheckDupeSocket)
 897                         {
 898                                 /* If we find one, we abort the link to prevent a race condition */
 899                                 this->SendError("Negotiation collision");
 900                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists in a negotiating state.");
 901                                 CheckDupeSocket->SendError("Negotiation collision");
 902                                 Instance->SE->DelFd(CheckDupeSocket);
 903                                 CheckDupeSocket->Close();
 904                                 delete CheckDupeSocket;
 905                                 return false;
 906                         }
 907                         /* Now check for fully initialized instances of the server */
 908                         TreeServer* CheckDupe = Utils->FindServer(sname);
 909                         if (CheckDupe)
 910                         {
 911                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 912                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 913                                 return false;
 914                         }
 915                         this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 916                         if (this->Hook)
 917                         {
 918                                 std::string name = InspSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 919                                 this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 920                         }
 921
 922                         Utils->AddBurstingServer(sname,this);
 923
 924                         // this is good. Send our details: Our server name and description and hopcount of 0,
 925                         // along with the sendpass from this block.
 926                         this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 :"+this->Instance->Config->ServerDesc);
 927                         // move to the next state, we are now waiting for THEM.
 928                         this->LinkState = WAIT_AUTH_2;
 929                         return true;
 930                 }
 931         }
 932         this->SendError("Invalid credentials");
 933         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 934         return false;
 935 }
 936
 937 void TreeSocket::Split(const std::string &line, std::deque<std::string> &n)
 938 {
 939         n.clear();
 940         irc::tokenstream tokens(line);
 941         std::string param;
 942         while (tokens.GetToken(param))
 943         {
 944                 if (!param.empty())
 945                         n.push_back(param);
 946         }
 947         return;
 948 }
 949
 950 bool TreeSocket::ProcessLine(std::string &line)
 951 {
 952         std::deque<std::string> params;
 953         irc::string command;
 954         std::string prefix;
 955
 956         line = line.substr(0, line.find_first_of("\r\n"));
 957
 958         if (line.empty())
 959                 return true;
 960
 961         Instance->Log(DEBUG, "S[%d] <- %s", this->GetFd(), line.c_str());
 962
 963         this->Split(line.c_str(),params);
 964
 965         if (params.empty())
 966                 return true;
 967
 968         if ((params[0][0] == ':') && (params.size() > 1))
 969         {
 970                 prefix = params[0].substr(1);
 971                 params.pop_front();
 972         }
 973         command = params[0].c_str();
 974         params.pop_front();
 975         switch (this->LinkState)
 976         {
 977                 TreeServer* Node;
 978
 979                 case WAIT_AUTH_1:
 980                         // Waiting for SERVER command from remote server. Server initiating
 981                         // the connection sends the first SERVER command, listening server
 982                         // replies with theirs if its happy, then if the initiator is happy,
 983                         // it starts to send its net sync, which starts the merge, otherwise
 984                         // it sends an ERROR.
 985                         if (command == "PASS")
 986                         {
 987                                 /* Silently ignored */
 988                         }
 989                         else if (command == "SERVER")
 990                         {
 991                                 return this->Inbound_Server(params);
 992                         }
 993                         else if (command == "ERROR")
 994                         {
 995                                 return this->Error(params);
 996                         }
 997                         else if (command == "USER")
 998                         {
 999                                 this->SendError("Client connections to this port are prohibited.");
1000                                 return false;
1001                         }
1002                         else if (command == "CAPAB")
1003                         {
1004                                 return this->Capab(params);
1005                         }
1006                         else if ((command == "U") || (command == "S"))
1007                         {
1008                                 this->SendError("Cannot use the old-style mesh linking protocol with m_spanningtree.so!");
1009                                 return false;
1010                         }
1011                         else
1012                         {
1013                                 irc::string error = "Invalid command in negotiation phase: " + command;
1014                                 this->SendError(assign(error));
1015                                 return false;
1016                         }
1017                 break;
1018                 case WAIT_AUTH_2:
1019                         // Waiting for start of other side's netmerge to say they liked our
1020                         // password.
1021                         if (command == "SERVER")
1022                         {
1023                                 // cant do this, they sent it to us in the WAIT_AUTH_1 state!
1024                                 // silently ignore.
1025                                 return true;
1026                         }
1027                         else if ((command == "U") || (command == "S"))
1028                         {
1029                                 this->SendError("Cannot use the old-style mesh linking protocol with m_spanningtree.so!");
1030                                 return false;
1031                         }
1032                         else if (command == "BURST")
1033                         {
1034                                 if (params.size() && Utils->EnableTimeSync)
1035                                 {
1036                                         bool we_have_delta = (Instance->Time(false) != Instance->Time(true));
1037                                         time_t them = atoi(params[0].c_str());
1038                                         time_t delta = them - Instance->Time(false);
1039                                         if ((delta < -300) || (delta > 300))
1040                                         {
1041                                                 Instance->SNO->WriteToSnoMask('l',"\2ERROR\2: Your clocks are out by %d seconds (this is more than five minutes). Link aborted, \2PLEASE SYNC YOUR CLOCKS!\2",abs(delta));
1042                                                 SendError("Your clocks are out by "+ConvToStr(abs(delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
1043                                                 return false;
1044                                         }
1045                                         else if ((delta < -30) || (delta > 30))
1046                                         {
1047                                                 Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs(delta));
1048                                         }
1049
1050                                         if (!Utils->MasterTime && !we_have_delta)
1051                                         {
1052                                                 this->Instance->SetTimeDelta(delta);
1053                                                 // Send this new timestamp to any other servers
1054                                                 Utils->DoOneToMany(Utils->TreeRoot->GetName(), "TIMESET", params);
1055                                         }
1056                                 }
1057                                 this->LinkState = CONNECTED;
1058                                 Link* lnk = Utils->FindLink(InboundServerName);
1059                                 Node = new TreeServer(this->Utils,this->Instance, InboundServerName, InboundDescription, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
1060                                 Utils->DelBurstingServer(this);
1061                                 Utils->TreeRoot->AddChild(Node);
1062                                 params.clear();
1063                                 params.push_back(InboundServerName);
1064                                 params.push_back("*");
1065                                 params.push_back("1");
1066                                 params.push_back(":"+InboundDescription);
1067                                 Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,InboundServerName);
1068                                 this->bursting = true;
1069                                 this->DoBurst(Node);
1070                         }
1071                         else if (command == "ERROR")
1072                         {
1073                                 return this->Error(params);
1074                         }
1075                         else if (command == "CAPAB")
1076                         {
1077                                 return this->Capab(params);
1078                         }
1079
1080                 break;
1081                 case LISTENER:
1082                         this->SendError("Internal error -- listening socket accepted its own descriptor!!!");
1083                         return false;
1084                 break;
1085                 case CONNECTING:
1086                         if (command == "SERVER")
1087                         {
1088                                 // another server we connected to, which was in WAIT_AUTH_1 state,
1089                                 // has just sent us their credentials. If we get this far, theyre
1090                                 // happy with OUR credentials, and they are now in WAIT_AUTH_2 state.
1091                                 // if we're happy with this, we should send our netburst which
1092                                 // kickstarts the merge.
1093                                 return this->Outbound_Reply_Server(params);
1094                         }
1095                         else if (command == "ERROR")
1096                         {
1097                                 return this->Error(params);
1098                         }
1099                         else if (command == "CAPAB")
1100                         {
1101                                 return this->Capab(params);
1102                         }
1103                 break;
1104                 case CONNECTED:
1105                         // This is the 'authenticated' state, when all passwords
1106                         // have been exchanged and anything past this point is taken
1107                         // as gospel.
1108
1109                         if (!prefix.empty())
1110                         {
1111                                 std::string direction = prefix;
1112                                 userrec* t = this->Instance->FindNick(prefix);
1113                                 if (t)
1114                                 {
1115                                         direction = t->server;
1116                                 }
1117                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
1118                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
1119                                 {
1120                                         if (route_back_again)
1121                                                 Instance->Log(DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
1122                                         return true;
1123                                 }
1124                                 /* Fix by brain:
1125                                  * When there is activity on the socket, reset the ping counter so
1126                                  * that we're not wasting bandwidth pinging an active server.
1127                                  */
1128                                 route_back_again->SetNextPingTime(time(NULL) + 60);
1129                                 route_back_again->SetPingFlag();
1130                         }
1131                         else
1132                         {
1133                                 prefix = this->GetName();
1134                         }
1135
1136                         if ((command == "MODE") && (params.size() >= 2))
1137                         {
1138                                 chanrec* channel = Instance->FindChan(params[0]);
1139                                 if (channel)
1140                                 {
1141                                         userrec* x = Instance->FindNick(prefix);
1142                                         if (x)
1143                                         {
1144                                                 if (warned.find(x->server) == warned.end())
1145                                                 {
1146                                                         Instance->Log(DEFAULT,"WARNING: I revceived modes '%s' from another server '%s'. This is not compliant with InspIRCd. Please check that server for bugs.", params[1].c_str(), x->server);
1147                                                         Instance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending nonstandard modes: '%s MODE %s' where FMODE should be used, and may cause desyncs.", x->server, x->nick, params[1].c_str());
1148                                                         warned[x->server] = x->nick;
1149                                                 }
1150                                         }
1151                                 }
1152                         }
1153
1154                         if (command == "SVSMODE")
1155                         {
1156                                 /* Services expects us to implement
1157                                  * SVSMODE. In inspircd its the same as
1158                                  * MODE anyway.
1159                                  */
1160                                 command = "MODE";
1161                         }
1162                         std::string target = "";
1163                         /* Yes, know, this is a mess. Its reasonably fast though as we're
1164                          * working with std::string here.
1165                          */
1166                         if ((command == "NICK") && (params.size() >= 8))
1167                         {
1168                                 return this->IntroduceClient(prefix,params);
1169                         }
1170                         else if (command == "FJOIN")
1171                         {
1172                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1173                                 if (ServerSource)
1174                                         Utils->SetRemoteBursting(ServerSource, false);
1175                                 return this->ForceJoin(prefix,params);
1176                         }
1177                         else if (command == "STATS")
1178                         {
1179                                 return this->Stats(prefix, params);
1180                         }
1181                         else if (command == "MOTD")
1182                         {
1183                                 return this->Motd(prefix, params);
1184                         }
1185                         else if (command == "MODULES")
1186                         {
1187                                 return this->Modules(prefix, params);
1188                         }
1189                         else if (command == "ADMIN")
1190                         {
1191                                 return this->Admin(prefix, params);
1192                         }
1193                         else if (command == "SERVER")
1194                         {
1195                                 return this->RemoteServer(prefix,params);
1196                         }
1197                         else if (command == "ERROR")
1198                         {
1199                                 return this->Error(params);
1200                         }
1201                         else if (command == "OPERTYPE")
1202                         {
1203                                 return this->OperType(prefix,params);
1204                         }
1205                         else if (command == "FMODE")
1206                         {
1207                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1208                                 if (ServerSource)
1209                                         Utils->SetRemoteBursting(ServerSource, false);
1210                                 return this->ForceMode(prefix,params);
1211                         }
1212                         else if (command == "FTOPIC")
1213                         {
1214                                 return this->ForceTopic(prefix,params);
1215                         }
1216                         else if (command == "REHASH")
1217                         {
1218                                 return this->RemoteRehash(prefix,params);
1219                         }
1220                         else if (command == "METADATA")
1221                         {
1222                                 return this->MetaData(prefix,params);
1223                         }
1224                         else if (command == "REMSTATUS")
1225                         {
1226                                 return this->RemoveStatus(prefix,params);
1227                         }
1228                         else if (command == "PING")
1229                         {
1230                                 if (prefix == "")
1231                                         prefix = this->GetName();
1232                                 /*
1233                                  * We just got a ping from a server that's bursting.
1234                                  * This can't be right, so set them to not bursting, and
1235                                  * apply their lines.
1236                                  */
1237                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1238                                 if (ServerSource)
1239                                         Utils->SetRemoteBursting(ServerSource, false);
1240
1241                                 if (this->bursting)
1242                                 {
1243                                         this->bursting = false;
1244                                         Instance->XLines->apply_lines(Utils->lines_to_apply);
1245                                         Utils->lines_to_apply = 0;
1246                                 }
1247
1248                                 return this->LocalPing(prefix,params);
1249                         }
1250                         else if (command == "PONG")
1251                         {
1252                                 if (prefix == "")
1253                                         prefix = this->GetName();
1254                                 /*
1255                                  * We just got a pong from a server that's bursting.
1256                                  * This can't be right, so set them to not bursting, and
1257                                  * apply their lines.
1258                                  */
1259                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1260                                 if (ServerSource)
1261                                         Utils->SetRemoteBursting(ServerSource, false);
1262
1263                                 if (this->bursting)
1264                                 {
1265                                         this->bursting = false;
1266                                         Instance->XLines->apply_lines(Utils->lines_to_apply);
1267                                         Utils->lines_to_apply = 0;
1268                                 }
1269
1270                                 return this->LocalPong(prefix,params);
1271                         }
1272                         else if (command == "VERSION")
1273                         {
1274                                 return this->ServerVersion(prefix,params);
1275                         }
1276                         else if (command == "FHOST")
1277                         {
1278                                 return this->ChangeHost(prefix,params);
1279                         }
1280                         else if (command == "FNAME")
1281                         {
1282                                 return this->ChangeName(prefix,params);
1283                         }
1284                         else if (command == "ADDLINE")
1285                         {
1286                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1287                                 if (ServerSource)
1288                                         Utils->SetRemoteBursting(ServerSource, false);
1289                                 return this->AddLine(prefix,params);
1290                         }
1291                         else if (command == "SVSNICK")
1292                         {
1293                                 if (prefix == "")
1294                                 {
1295                                         prefix = this->GetName();
1296                                 }
1297                                 return this->ForceNick(prefix,params);
1298                         }
1299                         else if (command == "OPERQUIT")
1300                         {
1301                                 return this->OperQuit(prefix,params);
1302                         }
1303                         else if (command == "RSQUIT")
1304                         {
1305                                 return this->RemoteSquit(prefix, params);
1306                         }
1307                         else if (command == "IDLE")
1308                         {
1309                                 return this->Whois(prefix,params);
1310                         }
1311                         else if (command == "PUSH")
1312                         {
1313                                 return this->Push(prefix,params);
1314                         }
1315                         else if (command == "TIMESET")
1316                         {
1317                                 return this->HandleSetTime(prefix, params);
1318                         }
1319                         else if (command == "TIME")
1320                         {
1321                                 return this->Time(prefix,params);
1322                         }
1323                         else if ((command == "KICK") && (Utils->IsServer(prefix)))
1324                         {
1325                                 std::string sourceserv = this->myhost;
1326                                 if (params.size() == 3)
1327                                 {
1328                                         userrec* user = this->Instance->FindNick(params[1]);
1329                                         chanrec* chan = this->Instance->FindChan(params[0]);
1330                                         if (user && chan)
1331                                         {
1332                                                 if (!chan->ServerKickUser(user, params[2].c_str(), false))
1333                                                         /* Yikes, the channels gone! */
1334                                                         delete chan;
1335                                         }
1336                                 }
1337                                 if (this->InboundServerName != "")
1338                                 {
1339                                         sourceserv = this->InboundServerName;
1340                                 }
1341                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1342                         }
1343                         else if (command == "SVSJOIN")
1344                         {
1345                                 if (prefix == "")
1346                                 {
1347                                         prefix = this->GetName();
1348                                 }
1349                                 return this->ServiceJoin(prefix,params);
1350                         }
1351                         else if (command == "SQUIT")
1352                         {
1353                                 if (params.size() == 2)
1354                                 {
1355                                         this->Squit(Utils->FindServer(params[0]),params[1]);
1356                                 }
1357                                 return true;
1358                         }
1359                         else if (command == "OPERNOTICE")
1360                         {
1361                                 std::string sourceserv = this->myhost;
1362                                 if (this->InboundServerName != "")
1363                                         sourceserv = this->InboundServerName;
1364                                 if (params.size() >= 1)
1365                                         Instance->WriteOpers("*** From " + sourceserv + ": " + params[0]);
1366                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1367                         }
1368                         else if (command == "MODENOTICE")
1369                         {
1370                                 std::string sourceserv = this->myhost;
1371                                 if (this->InboundServerName != "")
1372                                         sourceserv = this->InboundServerName;
1373                                 if (params.size() >= 2)
1374                                 {
1375                                         Instance->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", sourceserv.c_str(), params[1].c_str());
1376                                 }
1377                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1378                         }
1379                         else if (command == "SNONOTICE")
1380                         {
1381                                 std::string sourceserv = this->myhost;
1382                                 if (this->InboundServerName != "")
1383                                         sourceserv = this->InboundServerName;
1384                                 if (params.size() >= 2)
1385                                 {
1386                                         Instance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + sourceserv + ": "+ params[1]);
1387                                 }
1388                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1389                         }
1390                         else if (command == "ENDBURST")
1391                         {
1392                                 this->bursting = false;
1393                                 Instance->XLines->apply_lines(Utils->lines_to_apply);
1394                                 Utils->lines_to_apply = 0;
1395                                 std::string sourceserv = this->myhost;
1396                                 if (this->InboundServerName != "")
1397                                 {
1398                                         sourceserv = this->InboundServerName;
1399                                 }
1400                                 this->Instance->SNO->WriteToSnoMask('l',"Received end of netburst from \2%s\2",sourceserv.c_str());
1401
1402                                 Event rmode((char*)sourceserv.c_str(), (Module*)Utils->Creator, "new_server");
1403                                 rmode.Send(Instance);
1404
1405                                 return true;
1406                         }
1407                         else
1408                         {
1409                                 // not a special inter-server command.
1410                                 // Emulate the actual user doing the command,
1411                                 // this saves us having a huge ugly parser.
1412                                 userrec* who = this->Instance->FindNick(prefix);
1413                                 std::string sourceserv = this->myhost;
1414                                 if (this->InboundServerName != "")
1415                                 {
1416                                         sourceserv = this->InboundServerName;
1417                                 }
1418                                 if ((!who) && (command == "MODE"))
1419                                 {
1420                                         if (Utils->IsServer(prefix))
1421                                         {
1422                                                 const char* modelist[127];
1423                                                 for (size_t i = 0; i < params.size(); i++)
1424                                                         modelist[i] = params[i].c_str();
1425                                                 userrec* fake = new userrec(Instance);
1426                                                 fake->SetFd(FD_MAGIC_NUMBER);
1427                                                 this->Instance->SendMode(modelist, params.size(), fake);
1428
1429                                                 delete fake;
1430                                                 /* Hot potato! pass it on! */
1431                                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1432                                         }
1433                                 }
1434                                 if (who)
1435                                 {
1436                                         if ((command == "NICK") && (params.size() > 0))
1437                                         {
1438                                                 /* On nick messages, check that the nick doesnt
1439                                                  * already exist here. If it does, kill their copy,
1440                                                  * and our copy.
1441                                                  */
1442                                                 userrec* x = this->Instance->FindNick(params[0]);
1443                                                 if ((x) && (x != who))
1444                                                 {
1445                                                         std::deque<std::string> p;
1446                                                         p.push_back(params[0]);
1447                                                         p.push_back("Nickname collision ("+prefix+" -> "+params[0]+")");
1448                                                         Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
1449                                                         p.clear();
1450                                                         p.push_back(prefix);
1451                                                         p.push_back("Nickname collision");
1452                                                         Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
1453                                                         userrec::QuitUser(this->Instance,x,"Nickname collision ("+prefix+" -> "+params[0]+")");
1454                                                         userrec* y = this->Instance->FindNick(prefix);
1455                                                         if (y)
1456                                                         {
1457                                                                 userrec::QuitUser(this->Instance,y,"Nickname collision");
1458                                                         }
1459                                                         return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1460                                                 }
1461                                         }
1462                                         // its a user
1463                                         target = who->server;
1464                                         const char* strparams[127];
1465                                         for (unsigned int q = 0; q < params.size(); q++)
1466                                         {
1467                                                 strparams[q] = params[q].c_str();
1468                                         }
1469                                         switch (this->Instance->CallCommandHandler(command.c_str(), strparams, params.size(), who))
1470                                         {
1471                                                 case CMD_INVALID:
1472                                                         this->SendError("Unrecognised command '"+std::string(command.c_str())+"' -- possibly loaded mismatched modules");
1473                                                         return false;
1474                                                 break;
1475                                                 case CMD_FAILURE:
1476                                                         return true;
1477                                                 break;
1478                                                 default:
1479                                                         /* CMD_SUCCESS and CMD_USER_DELETED fall through here */
1480                                                 break;
1481                                         }
1482                                 }
1483                                 else
1484                                 {
1485                                         // its not a user. Its either a server, or somethings screwed up.
1486                                         if (Utils->IsServer(prefix))
1487                                                 target = this->Instance->Config->ServerName;
1488                                         else
1489                                                 return true;
1490                                 }
1491                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1492
1493                         }
1494                         return true;
1495                 break;
1496         }
1497         return true;
1498 }
1499
1500 std::string TreeSocket::GetName()
1501 {
1502         std::string sourceserv = this->myhost;
1503         if (this->InboundServerName != "")
1504         {
1505                 sourceserv = this->InboundServerName;
1506         }
1507         return sourceserv;
1508 }
1509
1510 void TreeSocket::OnTimeout()
1511 {
1512         if (this->LinkState == CONNECTING)
1513         {
1514                 this->Instance->SNO->WriteToSnoMask('l',"CONNECT: Connection to \002"+myhost+"\002 timed out.");
1515                 Link* MyLink = Utils->FindLink(myhost);
1516                 if (MyLink)
1517                         Utils->DoFailOver(MyLink);
1518         }
1519 }
1520
1521 void TreeSocket::OnClose()
1522 {
1523         // Connection closed.
1524         // If the connection is fully up (state CONNECTED)
1525         // then propogate a netsplit to all peers.
1526         std::string quitserver = this->myhost;
1527         if (this->InboundServerName != "")
1528         {
1529                 quitserver = this->InboundServerName;
1530         }
1531         TreeServer* s = Utils->FindServer(quitserver);
1532         if (s)
1533         {
1534                 Squit(s,"Remote host closed the connection");
1535         }
1536
1537         if (quitserver != "")
1538         {
1539                 this->Instance->SNO->WriteToSnoMask('l',"Connection to '\2%s\2' failed.",quitserver.c_str());
1540                 time_t server_uptime = Instance->Time() - this->age;
1541                 if (server_uptime)
1542                         Instance->SNO->WriteToSnoMask('l',"Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
1543         }
1544 }
1545
1546 int TreeSocket::OnIncomingConnection(int newsock, char* ip)
1547 {
1548         /* To prevent anyone from attempting to flood opers/DDoS by connecting to the server port,
1549          * or discovering if this port is the server port, we don't allow connections from any
1550          * IPs for which we don't have a link block.
1551          */
1552         bool found = false;
1553
1554         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
1555         if (!found)
1556         {
1557                 for (vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
1558                         if (irc::sockets::MatchCIDR(ip, (*i).c_str()))
1559                                 found = true;
1560
1561                 if (!found)
1562                 {
1563                         this->Instance->SNO->WriteToSnoMask('l',"Server connection from %s denied (no link blocks with that IP address)", ip);
1564                         close(newsock);
1565                         return false;
1566                 }
1567         }
1568
1569         TreeSocket* s = new TreeSocket(this->Utils, this->Instance, newsock, ip, this->Hook);
1570         s = s; /* Whinge whinge whinge, thats all GCC ever does. */
1571         return true;
1572 }