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 "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "wildcard.h"
  19 #include "xline.h"
  20 #include "transport.h"
  21 #include "socketengine.h"
  22
  23 #include "m_spanningtree/main.h"
  24 #include "m_spanningtree/utils.h"
  25 #include "m_spanningtree/treeserver.h"
  26 #include "m_spanningtree/link.h"
  27 #include "m_spanningtree/treesocket.h"
  28 #include "m_spanningtree/resolvers.h"
  29 #include "m_spanningtree/handshaketimer.h"
  30
  31 /* $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 */
  32
  33 static std::map<std::string, std::string> warned;       /* Server names that have had protocol violation warnings displayed for them */
  34
  35 int TreeSocket::WriteLine(std::string line)
  36 {
  37         Instance->Log(DEBUG, "S[%d] O %s", this->GetFd(), line.c_str());
  38         line.append("\r\n");
  39         return this->Write(line);
  40 }
  41
  42
  43 /* Handle ERROR command */
  44 bool TreeSocket::Error(std::deque<std::string> &params)
  45 {
  46         if (params.size() < 1)
  47                 return false;
  48         this->Instance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(!InboundServerName.empty() ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
  49         /* we will return false to cause the socket to close. */
  50         return false;
  51 }
  52
  53 bool TreeSocket::Modules(const std::string &prefix, std::deque<std::string> &params)
  54 {
  55         if (params.empty())
  56                 return true;
  57
  58         if (!this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
  59         {
  60                 /* Pass it on, not for us */
  61                 Utils->DoOneToOne(prefix, "MODULES", params, params[0]);
  62                 return true;
  63         }
  64
  65         char strbuf[MAXBUF];
  66         std::deque<std::string> par;
  67         par.push_back(prefix);
  68         par.push_back("");
  69
  70         userrec* source = this->Instance->FindNick(prefix);
  71         if (!source)
  72                 return true;
  73
  74         for (unsigned int i = 0; i < Instance->Config->module_names.size(); i++)
  75         {
  76                 Version V = Instance->modules[i]->GetVersion();
  77                 char modulename[MAXBUF];
  78                 char flagstate[MAXBUF];
  79                 *flagstate = 0;
  80                 if (V.Flags & VF_STATIC)
  81                         strlcat(flagstate,", static",MAXBUF);
  82                 if (V.Flags & VF_VENDOR)
  83                         strlcat(flagstate,", vendor",MAXBUF);
  84                 if (V.Flags & VF_COMMON)
  85                         strlcat(flagstate,", common",MAXBUF);
  86                 if (V.Flags & VF_SERVICEPROVIDER)
  87                         strlcat(flagstate,", service provider",MAXBUF);
  88                 if (!flagstate[0])
  89                         strcpy(flagstate,"  <no flags>");
  90                 strlcpy(modulename,Instance->Config->module_names[i].c_str(),256);
  91                 if (*source->oper)
  92                 {
  93                         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);
  94                 }
  95                 else
  96                 {
  97                         snprintf(strbuf, MAXBUF, "::%s 900 %s :%s",Instance->Config->ServerName,source->nick,ServerConfig::CleanFilename(modulename));
  98                 }
  99                 par[1] = strbuf;
 100                 Utils->DoOneToOne(Instance->Config->GetSID(), "PUSH", par, source->server);
 101         }
 102         snprintf(strbuf, MAXBUF, "::%s 901 %s :End of MODULES list", Instance->Config->ServerName, source->nick);
 103         par[1] = strbuf;
 104         Utils->DoOneToOne(Instance->Config->GetSID(), "PUSH", par, source->server);
 105         return true;
 106 }
 107
 108 /** remote MOTD. leet, huh? */
 109 bool TreeSocket::Motd(const std::string &prefix, std::deque<std::string> &params)
 110 {
 111         if (params.size() > 0)
 112         {
 113                 if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
 114                 {
 115                         /* It's for our server */
 116                         string_list results;
 117                         userrec* source = this->Instance->FindNick(prefix);
 118
 119                         if (source)
 120                         {
 121                                 std::deque<std::string> par;
 122                                 par.push_back(prefix);
 123                                 par.push_back("");
 124
 125                                 if (!Instance->Config->MOTD.size())
 126                                 {
 127                                         par[1] = std::string("::")+Instance->Config->ServerName+" 422 "+source->nick+" :Message of the day file is missing.";
 128                                         Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 129                                         return true;
 130                                 }
 131
 132                                 par[1] = std::string("::")+Instance->Config->ServerName+" 375 "+source->nick+" :"+Instance->Config->ServerName+" message of the day";
 133                                 Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 134
 135                                 for (unsigned int i = 0; i < Instance->Config->MOTD.size(); i++)
 136                                 {
 137                                         par[1] = std::string("::")+Instance->Config->ServerName+" 372 "+source->nick+" :- "+Instance->Config->MOTD[i];
 138                                         Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 139                                 }
 140
 141                                 par[1] = std::string("::")+Instance->Config->ServerName+" 376 "+source->nick+" :End of message of the day.";
 142                                 Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 143                         }
 144                 }
 145                 else
 146                 {
 147                         /* Pass it on */
 148                         userrec* source = this->Instance->FindNick(prefix);
 149                         if (source)
 150                                 Utils->DoOneToOne(prefix, "MOTD", params, params[0]);
 151                 }
 152         }
 153         return true;
 154 }
 155
 156 /** remote ADMIN. leet, huh? */
 157 bool TreeSocket::Admin(const std::string &prefix, std::deque<std::string> &params)
 158 {
 159         if (params.size() > 0)
 160         {
 161                 if (this->Instance->MatchText(this->Instance->Config->ServerName, params[0]))
 162                 {
 163                         /* It's for our server */
 164                         string_list results;
 165                         userrec* source = this->Instance->FindNick(prefix);
 166                         if (source)
 167                         {
 168                                 std::deque<std::string> par;
 169                                 par.push_back(prefix);
 170                                 par.push_back("");
 171                                 par[1] = std::string("::")+Instance->Config->ServerName+" 256 "+source->nick+" :Administrative info for "+Instance->Config->ServerName;
 172                                 Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 173                                 par[1] = std::string("::")+Instance->Config->ServerName+" 257 "+source->nick+" :Name     - "+Instance->Config->AdminName;
 174                                 Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 175                                 par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :Nickname - "+Instance->Config->AdminNick;
 176                                 Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 177                                 par[1] = std::string("::")+Instance->Config->ServerName+" 258 "+source->nick+" :E-Mail   - "+Instance->Config->AdminEmail;
 178                                 Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 179                         }
 180                 }
 181                 else
 182                 {
 183                         /* Pass it on */
 184                         userrec* source = this->Instance->FindNick(prefix);
 185                         if (source)
 186                                 Utils->DoOneToOne(prefix, "ADMIN", params, params[0]);
 187                 }
 188         }
 189         return true;
 190 }
 191
 192 bool TreeSocket::Stats(const std::string &prefix, std::deque<std::string> &params)
 193 {
 194         /* Get the reply to a STATS query if it matches this servername,
 195          * and send it back as a load of PUSH queries
 196          */
 197         if (params.size() > 1)
 198         {
 199                 if (this->Instance->MatchText(this->Instance->Config->ServerName, params[1]))
 200                 {
 201                         /* It's for our server */
 202                         string_list results;
 203                         userrec* source = this->Instance->FindNick(prefix);
 204                         if (source)
 205                         {
 206                                 std::deque<std::string> par;
 207                                 par.push_back(prefix);
 208                                 par.push_back("");
 209                                 DoStats(this->Instance, *(params[0].c_str()), source, results);
 210                                 for (size_t i = 0; i < results.size(); i++)
 211                                 {
 212                                         par[1] = "::" + results[i];
 213                                         Utils->DoOneToOne(this->Instance->Config->GetSID(), "PUSH",par, source->server);
 214                                 }
 215                         }
 216                 }
 217                 else
 218                 {
 219                         /* Pass it on */
 220                         userrec* source = this->Instance->FindNick(prefix);
 221                         if (source)
 222                                 Utils->DoOneToOne(source->uuid, "STATS", params, params[1]);
 223                 }
 224         }
 225         return true;
 226 }
 227
 228
 229 /** Because the core won't let users or even SERVERS set +o,
 230  * we use the OPERTYPE command to do this.
 231  */
 232 bool TreeSocket::OperType(const std::string &prefix, std::deque<std::string> &params)
 233 {
 234         if (params.size() != 1)
 235                 return true;
 236         std::string opertype = params[0];
 237         userrec* u = this->Instance->FindNick(prefix);
 238         if (u)
 239         {
 240                 u->modes[UM_OPERATOR] = 1;
 241                 this->Instance->all_opers.push_back(u);
 242                 strlcpy(u->oper,opertype.c_str(),NICKMAX-1);
 243                 Utils->DoOneToAllButSender(u->nick,"OPERTYPE",params,u->server);
 244
 245                 TreeServer* remoteserver = Utils->FindServer(u->server);
 246                 bool dosend = true;
 247
 248                 if (this->Utils->quiet_bursts)
 249                 {
 250                         /*
 251                          * If quiet bursts are enabled, and server is bursting or silent uline (i.e. services),
 252                          * then do nothing. -- w00t
 253                          */
 254                         if (
 255                                 this->bursting ||
 256                                 Utils->FindRemoteBurstServer(remoteserver) ||
 257                                 this->Instance->SilentULine(this->Instance->FindServerNamePtr(u->server))
 258                            )
 259                         {
 260                                 dosend = false;
 261                         }
 262                 }
 263
 264                 if (dosend)
 265                         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()));
 266         }
 267         return true;
 268 }
 269
 270 /** Because Andy insists that services-compatible servers must
 271  * implement SVSNICK and SVSJOIN, that's exactly what we do :p
 272  */
 273 bool TreeSocket::ForceNick(const std::string &prefix, std::deque<std::string> &params)
 274 {
 275         if (params.size() < 3)
 276                 return true;
 277
 278         userrec* u = this->Instance->FindNick(params[0]);
 279
 280         if (u)
 281         {
 282                 Utils->DoOneToAllButSender(prefix,"SVSNICK",params,prefix);
 283
 284                 if (IS_LOCAL(u))
 285                 {
 286                         std::deque<std::string> par;
 287                         par.push_back(params[1]);
 288
 289                         if (!u->ForceNickChange(params[1].c_str()))
 290                         {
 291                                 /* buh. UID them */
 292                                 if (!u->ForceNickChange(u->uuid))
 293                                 {
 294                                         userrec::QuitUser(this->Instance, u, "Nickname collision");
 295                                         return true;
 296                                 }
 297                         }
 298
 299                         u->age = atoi(params[2].c_str());
 300                 }
 301         }
 302
 303         return true;
 304 }
 305
 306 bool TreeSocket::OperQuit(const std::string &prefix, std::deque<std::string> &params)
 307 {
 308         if (params.size() < 1)
 309                 return true;
 310
 311         userrec* u = this->Instance->FindNick(prefix);
 312
 313         if (u)
 314         {
 315                 u->SetOperQuit(params[0]);
 316                 params[0] = ":" + params[0];
 317                 Utils->DoOneToAllButSender(prefix,"OPERQUIT",params,prefix);
 318         }
 319         return true;
 320 }
 321
 322 bool TreeSocket::ServiceJoin(const std::string &prefix, std::deque<std::string> &params)
 323 {
 324         if (params.size() < 2)
 325                 return true;
 326
 327         if (!this->Instance->IsChannel(params[1].c_str()))
 328                 return true;
 329
 330         userrec* u = this->Instance->FindNick(params[0]);
 331
 332         if (u)
 333         {
 334                 /* only join if it's local, otherwise just pass it on! */
 335                 if (IS_LOCAL(u))
 336                         chanrec::JoinUser(this->Instance, u, params[1].c_str(), false, "", Instance->Time());
 337                 Utils->DoOneToAllButSender(prefix,"SVSJOIN",params,prefix);
 338         }
 339         return true;
 340 }
 341
 342 bool TreeSocket::RemoteRehash(const std::string &prefix, std::deque<std::string> &params)
 343 {
 344         if (params.size() < 1)
 345                 return false;
 346
 347         std::string servermask = params[0];
 348
 349         if (this->Instance->MatchText(this->Instance->Config->ServerName,servermask))
 350         {
 351                 this->Instance->SNO->WriteToSnoMask('l',"Remote rehash initiated by \002"+prefix+"\002.");
 352                 this->Instance->RehashServer();
 353                 Utils->ReadConfiguration(false);
 354                 InitializeDisabledCommands(Instance->Config->DisabledCommands, Instance);
 355         }
 356         Utils->DoOneToAllButSender(prefix,"REHASH",params,prefix);
 357         return true;
 358 }
 359
 360 bool TreeSocket::RemoteKill(const std::string &prefix, std::deque<std::string> &params)
 361 {
 362         if (params.size() != 2)
 363                 return true;
 364
 365         userrec* who = this->Instance->FindNick(params[0]);
 366
 367         if (who)
 368         {
 369                 /* Prepend kill source, if we don't have one */
 370                 if (*(params[1].c_str()) != '[')
 371                 {
 372                         params[1] = "[" + prefix + "] Killed (" + params[1] +")";
 373                 }
 374                 std::string reason = params[1];
 375                 params[1] = ":" + params[1];
 376                 Utils->DoOneToAllButSender(prefix,"KILL",params,prefix);
 377                 // NOTE: This is safe with kill hiding on, as RemoteKill is only reached if we have a server prefix.
 378                 // in short this is not executed for USERS.
 379                 who->Write(":%s KILL %s :%s (%s)", prefix.c_str(), who->nick, prefix.c_str(), reason.c_str());
 380                 userrec::QuitUser(this->Instance,who,reason);
 381         }
 382         return true;
 383 }
 384
 385 bool TreeSocket::LocalPong(const std::string &prefix, std::deque<std::string> &params)
 386 {
 387         if (params.size() < 1)
 388                 return true;
 389
 390         if (params.size() == 1)
 391         {
 392                 TreeServer* ServerSource = Utils->FindServer(prefix);
 393                 if (ServerSource)
 394                 {
 395                         ServerSource->SetPingFlag();
 396                         timeval t;
 397                         gettimeofday(&t, NULL);
 398                         long ts = (t.tv_sec * 1000) + (t.tv_usec / 1000);
 399                         ServerSource->rtt = ts - ServerSource->LastPingMsec;
 400                 }
 401         }
 402         else
 403         {
 404                 std::string forwardto = params[1];
 405                 if (forwardto == this->Instance->Config->GetSID() || forwardto == this->Instance->ServerName)
 406                 {
 407                         /*
 408                          * this is a PONG for us
 409                          * if the prefix is a user, check theyre local, and if they are,
 410                          * dump the PONG reply back to their fd. If its a server, do nowt.
 411                          * Services might want to send these s->s, but we dont need to yet.
 412                          */
 413                         userrec* u = this->Instance->FindNick(prefix);
 414                         if (u)
 415                         {
 416                                 u->WriteServ("PONG %s %s",params[0].c_str(),params[1].c_str());
 417                         }
 418                 }
 419                 else
 420                 {
 421                         // not for us, pass it on :)
 422                         Utils->DoOneToOne(prefix,"PONG",params,forwardto);
 423                 }
 424         }
 425
 426         return true;
 427 }
 428
 429 bool TreeSocket::MetaData(const std::string &prefix, std::deque<std::string> &params)
 430 {
 431         if (params.size() < 2)
 432                 return true;
 433         else if (params.size() < 3)
 434                 params.push_back("");
 435         TreeServer* ServerSource = Utils->FindServer(prefix);
 436         if (ServerSource)
 437         {
 438                 Utils->SetRemoteBursting(ServerSource, false);
 439
 440                 if (params[0] == "*")
 441                 {
 442                         FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_OTHER,NULL,params[1],params[2]));
 443                 }
 444                 else if (*(params[0].c_str()) == '#')
 445                 {
 446                         chanrec* c = this->Instance->FindChan(params[0]);
 447                         if (c)
 448                         {
 449                                 FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_CHANNEL,c,params[1],params[2]));
 450                         }
 451                 }
 452                 else if (*(params[0].c_str()) != '#')
 453                 {
 454                         userrec* u = this->Instance->FindNick(params[0]);
 455                         if (u)
 456                         {
 457                                 FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_USER,u,params[1],params[2]));
 458                         }
 459                 }
 460         }
 461
 462         params[2] = ":" + params[2];
 463         Utils->DoOneToAllButSender(prefix,"METADATA",params,prefix);
 464         return true;
 465 }
 466
 467 bool TreeSocket::ServerVersion(const std::string &prefix, std::deque<std::string> &params)
 468 {
 469         if (params.size() < 1)
 470                 return true;
 471
 472         TreeServer* ServerSource = Utils->FindServer(prefix);
 473
 474         if (ServerSource)
 475         {
 476                 ServerSource->SetVersion(params[0]);
 477         }
 478         params[0] = ":" + params[0];
 479         Utils->DoOneToAllButSender(prefix,"VERSION",params,prefix);
 480         return true;
 481 }
 482
 483 bool TreeSocket::ChangeHost(const std::string &prefix, std::deque<std::string> &params)
 484 {
 485         if (params.size() < 1)
 486                 return true;
 487         userrec* u = this->Instance->FindNick(prefix);
 488
 489         if (u)
 490         {
 491                 u->ChangeDisplayedHost(params[0].c_str());
 492                 Utils->DoOneToAllButSender(prefix,"FHOST",params,u->server);
 493         }
 494         return true;
 495 }
 496
 497 bool TreeSocket::AddLine(const std::string &prefix, std::deque<std::string> &params)
 498 {
 499         if (params.size() < 6)
 500                 return true;
 501         bool propogate = false;
 502         if (!this->bursting)
 503                 Utils->lines_to_apply = 0;
 504         switch (*(params[0].c_str()))
 505         {
 506                 case 'Z':
 507                         propogate = Instance->XLines->add_zline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 508                         Instance->XLines->zline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 509                         if (propogate)
 510                                 Utils->lines_to_apply |= APPLY_ZLINES;
 511                 break;
 512                 case 'Q':
 513                         propogate = Instance->XLines->add_qline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 514                         Instance->XLines->qline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 515                         if (propogate)
 516                                 Utils->lines_to_apply |= APPLY_QLINES;
 517                 break;
 518                 case 'E':
 519                         propogate = Instance->XLines->add_eline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 520                         Instance->XLines->eline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 521                 break;
 522                 case 'G':
 523                         propogate = Instance->XLines->add_gline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 524                         Instance->XLines->gline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 525                         if (propogate)
 526                                 Utils->lines_to_apply |= APPLY_GLINES;
 527                 break;
 528                 case 'K':
 529                         propogate = Instance->XLines->add_kline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 530                         if (propogate)
 531                                 Utils->lines_to_apply |= APPLY_KLINES;
 532                 break;
 533                 default:
 534                         /* Just in case... */
 535                         this->Instance->SNO->WriteToSnoMask('x',"\2WARNING\2: Invalid xline type '"+params[0]+"' sent by server "+prefix+", ignored!");
 536                         propogate = false;
 537                 break;
 538         }
 539         /* Send it on its way */
 540         if (propogate)
 541         {
 542                 if (atoi(params[4].c_str()))
 543                 {
 544                         time_t c_requires_crap = ConvToInt(params[4]) + Instance->Time();
 545                         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());
 546                 }
 547                 else
 548                 {
 549                         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());
 550                 }
 551                 params[5] = ":" + params[5];
 552                 Utils->DoOneToAllButSender(prefix,"ADDLINE",params,prefix);
 553         }
 554         if (!this->bursting)
 555         {
 556                 Instance->XLines->apply_lines(Utils->lines_to_apply);
 557                 Utils->lines_to_apply = 0;
 558         }
 559         return true;
 560 }
 561
 562 bool TreeSocket::ChangeName(const std::string &prefix, std::deque<std::string> &params)
 563 {
 564         if (params.size() < 1)
 565                 return true;
 566         userrec* u = this->Instance->FindNick(prefix);
 567         if (u)
 568         {
 569                 u->ChangeName(params[0].c_str());
 570                 params[0] = ":" + params[0];
 571                 Utils->DoOneToAllButSender(prefix,"FNAME",params,u->server);
 572         }
 573         return true;
 574 }
 575
 576 bool TreeSocket::Whois(const std::string &prefix, std::deque<std::string> &params)
 577 {
 578         if (params.size() < 1)
 579                 return true;
 580         userrec* u = this->Instance->FindNick(prefix);
 581         if (u)
 582         {
 583                 // an incoming request
 584                 if (params.size() == 1)
 585                 {
 586                         userrec* x = this->Instance->FindNick(params[0]);
 587                         if ((x) && (IS_LOCAL(x)))
 588                         {
 589                                 userrec* x = this->Instance->FindNick(params[0]);
 590                                 char signon[MAXBUF];
 591                                 char idle[MAXBUF];
 592                                 snprintf(signon, MAXBUF, "%lu", (unsigned long)x->signon);
 593                                 snprintf(idle, MAXBUF, "%lu", (unsigned long)abs((x->idle_lastmsg) - Instance->Time(true)));
 594                                 std::deque<std::string> par;
 595                                 par.push_back(prefix);
 596                                 par.push_back(signon);
 597                                 par.push_back(idle);
 598                                 // ours, we're done, pass it BACK
 599                                 Utils->DoOneToOne(params[0], "IDLE", par, u->server);
 600                         }
 601                         else
 602                         {
 603                                 // not ours pass it on
 604                                 if (x)
 605                                         Utils->DoOneToOne(prefix, "IDLE", params, x->server);
 606                         }
 607                 }
 608                 else if (params.size() == 3)
 609                 {
 610                         std::string who_did_the_whois = params[0];
 611                         userrec* who_to_send_to = this->Instance->FindNick(who_did_the_whois);
 612                         if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
 613                         {
 614                                 // an incoming reply to a whois we sent out
 615                                 std::string nick_whoised = prefix;
 616                                 unsigned long signon = atoi(params[1].c_str());
 617                                 unsigned long idle = atoi(params[2].c_str());
 618                                 if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
 619                                 {
 620                                         do_whois(this->Instance, who_to_send_to, u, signon, idle, nick_whoised.c_str());
 621                                 }
 622                         }
 623                         else
 624                         {
 625                                 // not ours, pass it on
 626                                 if (who_to_send_to)
 627                                         Utils->DoOneToOne(prefix, "IDLE", params, who_to_send_to->server);
 628                         }
 629                 }
 630         }
 631         return true;
 632 }
 633
 634 bool TreeSocket::Push(const std::string &prefix, std::deque<std::string> &params)
 635 {
 636         if (params.size() < 2)
 637                 return true;
 638         userrec* u = this->Instance->FindNick(params[0]);
 639         if (!u)
 640                 return true;
 641         if (IS_LOCAL(u))
 642         {
 643                 u->Write(params[1]);
 644         }
 645         else
 646         {
 647                 // continue the raw onwards
 648                 params[1] = ":" + params[1];
 649                 Utils->DoOneToOne(prefix,"PUSH",params,u->server);
 650         }
 651         return true;
 652 }
 653
 654 bool TreeSocket::HandleSetTime(const std::string &prefix, std::deque<std::string> &params)
 655 {
 656         if (!params.size() || !Utils->EnableTimeSync)
 657                 return true;
 658
 659         bool force = false;
 660
 661         if ((params.size() == 2) && (params[1] == "FORCE"))
 662                 force = true;
 663
 664         time_t them = atoi(params[0].c_str());
 665         time_t us = Instance->Time(false);
 666
 667         time_t diff = them - us;
 668
 669         Utils->DoOneToAllButSender(prefix, "TIMESET", params, prefix);
 670
 671         if (force || (them != us))
 672         {
 673                 time_t old = Instance->SetTimeDelta(diff);
 674                 Instance->Log(DEBUG, "TS (diff %d) from %s applied (old delta was %d)", diff, prefix.c_str(), old);
 675         }
 676
 677         return true;
 678 }
 679
 680 bool TreeSocket::Time(const std::string &prefix, std::deque<std::string> &params)
 681 {
 682         // :source.server TIME remote.server sendernick
 683         // :remote.server TIME source.server sendernick TS
 684         if (params.size() == 2)
 685         {
 686                 // someone querying our time?
 687                 if (this->Instance->Config->ServerName == params[0] || this->Instance->Config->GetSID() == params[0])
 688                 {
 689                         userrec* u = this->Instance->FindNick(params[1]);
 690                         if (u)
 691                         {
 692                                 params.push_back(ConvToStr(Instance->Time(false)));
 693                                 params[0] = prefix;
 694                                 Utils->DoOneToOne(this->Instance->Config->GetSID(),"TIME",params,params[0]);
 695                         }
 696                 }
 697                 else
 698                 {
 699                         // not us, pass it on
 700                         userrec* u = this->Instance->FindNick(params[1]);
 701                         if (u)
 702                                 Utils->DoOneToOne(prefix,"TIME",params,params[0]);
 703                 }
 704         }
 705         else if (params.size() == 3)
 706         {
 707                 // a response to a previous TIME
 708                 userrec* u = this->Instance->FindNick(params[1]);
 709                 if ((u) && (IS_LOCAL(u)))
 710                 {
 711                         time_t rawtime = atol(params[2].c_str());
 712                         struct tm * timeinfo;
 713                         timeinfo = localtime(&rawtime);
 714                         char tms[26];
 715                         snprintf(tms,26,"%s",asctime(timeinfo));
 716                         tms[24] = 0;
 717                         u->WriteServ("391 %s %s :%s",u->nick,prefix.c_str(),tms);
 718                 }
 719                 else
 720                 {
 721                         if (u)
 722                                 Utils->DoOneToOne(prefix,"TIME",params,u->server);
 723                 }
 724         }
 725         return true;
 726 }
 727
 728 bool TreeSocket::LocalPing(const std::string &prefix, std::deque<std::string> &params)
 729 {
 730         if (params.size() < 1)
 731                 return true;
 732         if (params.size() == 1)
 733         {
 734                 std::string stufftobounce = params[0];
 735                 this->WriteLine(std::string(":")+this->Instance->Config->GetSID()+" PONG "+stufftobounce);
 736                 return true;
 737         }
 738         else
 739         {
 740                 std::string forwardto = params[1];
 741                 if (forwardto == this->Instance->Config->ServerName || forwardto == this->Instance->Config->GetSID())
 742                 {
 743                         // this is a ping for us, send back PONG to the requesting server
 744                         params[1] = params[0];
 745                         params[0] = forwardto;
 746                         Utils->DoOneToOne(forwardto,"PONG",params,params[1]);
 747                 }
 748                 else
 749                 {
 750                         // not for us, pass it on :)
 751                         Utils->DoOneToOne(prefix,"PING",params,forwardto);
 752                 }
 753                 return true;
 754         }
 755 }
 756
 757 /** TODO: This creates a total mess of output and needs to really use irc::modestacker.
 758  */
 759 bool TreeSocket::RemoveStatus(const std::string &prefix, std::deque<std::string> &params)
 760 {
 761         if (params.size() < 1)
 762                 return true;
 763         chanrec* c = Instance->FindChan(params[0]);
 764         if (c)
 765         {
 766                 for (char modeletter = 'A'; modeletter <= 'z'; modeletter++)
 767                 {
 768                         ModeHandler* mh = Instance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
 769                         if (mh)
 770                                 mh->RemoveMode(c);
 771                 }
 772         }
 773         return true;
 774 }
 775
 776 bool TreeSocket::RemoteServer(const std::string &prefix, std::deque<std::string> &params)
 777 {
 778         if (params.size() < 5)
 779                 return false;
 780         std::string servername = params[0];
 781         std::string password = params[1];
 782         // hopcount is not used for a remote server, we calculate this ourselves
 783         std::string sid = params[3];
 784         std::string description = params[4];
 785         TreeServer* ParentOfThis = Utils->FindServer(prefix);
 786         if (!ParentOfThis)
 787         {
 788                 this->SendError("Protocol error - Introduced remote server from unknown server "+prefix);
 789                 return false;
 790         }
 791         TreeServer* CheckDupe = Utils->FindServer(servername);
 792         if (CheckDupe)
 793         {
 794                 this->SendError("Server "+servername+" already exists!");
 795                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, already exists. Closing link with " + prefix);
 796                 return false;
 797         }
 798
 799         Link* lnk = Utils->FindLink(servername);
 800
 801         TreeServer *Node = new TreeServer(this->Utils, this->Instance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
 802
 803         if (Node->DuplicateID())
 804         {
 805                 this->SendError("Server ID "+sid+" already exists on the network!");
 806                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, server ID already exists on the network. Closing link with " + prefix);
 807                 return false;
 808         }
 809
 810         ParentOfThis->AddChild(Node);
 811         params[4] = ":" + params[4];
 812         Utils->SetRemoteBursting(Node, true);
 813         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
 814         this->Instance->SNO->WriteToSnoMask('l',"Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
 815         return true;
 816 }
 817
 818 bool TreeSocket::ComparePass(const std::string &ours, const std::string &theirs)
 819 {
 820         if ((!strncmp(ours.c_str(), "HMAC-SHA256:", 12)) || (!strncmp(theirs.c_str(), "HMAC-SHA256:", 12)))
 821         {
 822                 /* One or both of us specified hmac sha256, but we don't have sha256 module loaded!
 823                  * We can't allow this password as valid.
 824                  */
 825                 if (!Instance->FindModule("m_sha256.so") || !Utils->ChallengeResponse)
 826                                 return false;
 827                 else
 828                         /* Straight string compare of hashes */
 829                         return ours == theirs;
 830         }
 831         else
 832                 /* Straight string compare of plaintext */
 833                 return ours == theirs;
 834 }
 835
 836 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
 837 {
 838         if (params.size() < 5)
 839                 return false;
 840
 841         irc::string servername = params[0].c_str();
 842         std::string sname = params[0];
 843         std::string password = params[1];
 844         std::string sid = params[3];
 845         std::string description = params[4];
 846         int hops = atoi(params[2].c_str());
 847
 848         this->InboundServerName = sname;
 849         this->InboundDescription = description;
 850         this->InboundSID = sid;
 851
 852         if (!sentcapab)
 853                 this->SendCapabilities();
 854
 855         if (hops)
 856         {
 857                 this->SendError("Server too far away for authentication");
 858                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 859                 return false;
 860         }
 861
 862         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 863         {
 864                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password)) || (x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 865                 {
 866                         TreeServer* CheckDupe = Utils->FindServer(sname);
 867                         if (CheckDupe)
 868                         {
 869                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 870                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 871                                 return false;
 872                         }
 873                         // Begin the sync here. this kickstarts the
 874                         // other side, waiting in WAIT_AUTH_2 state,
 875                         // into starting their burst, as it shows
 876                         // that we're happy.
 877                         this->LinkState = CONNECTED;
 878                         // we should add the details of this server now
 879                         // to the servers tree, as a child of the root
 880                         // node.
 881
 882                         TreeServer *Node = new TreeServer(this->Utils, this->Instance, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 883
 884                         if (Node->DuplicateID())
 885                         {
 886                                 this->SendError("Server ID "+sid+" already exists on the network!");
 887                                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+assign(servername)+"\2 being introduced denied, server ID already exists on the network. Closing link.");
 888                                 return false;
 889                         }
 890
 891                         Utils->TreeRoot->AddChild(Node);
 892                         params[4] = ":" + params[4];
 893                         Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,sname);
 894                         this->bursting = true;
 895                         this->DoBurst(Node);
 896                         return true;
 897                 }
 898         }
 899         this->SendError("Invalid credentials");
 900         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 901         return false;
 902 }
 903
 904 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 905 {
 906         if (params.size() < 5)
 907                 return false;
 908         irc::string servername = params[0].c_str();
 909         std::string sname = params[0];
 910         std::string password = params[1];
 911         std::string sid = params[3];
 912         std::string description = params[4];
 913         int hops = atoi(params[2].c_str());
 914
 915         this->InboundServerName = sname;
 916         this->InboundDescription = description;
 917         this->InboundSID = sid;
 918
 919         if (!sentcapab)
 920                 this->SendCapabilities();
 921
 922         if (hops)
 923         {
 924                 this->SendError("Server too far away for authentication");
 925                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 926                 return false;
 927         }
 928
 929         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 930         {
 931                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password) || x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 932                 {
 933                         /* First check for instances of the server that are waiting between the inbound and outbound SERVER command */
 934                         TreeSocket* CheckDupeSocket = Utils->FindBurstingServer(sname);
 935                         if (CheckDupeSocket)
 936                         {
 937                                 /* If we find one, we abort the link to prevent a race condition */
 938                                 this->SendError("Negotiation collision");
 939                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists in a negotiating state.");
 940                                 CheckDupeSocket->SendError("Negotiation collision");
 941                                 Instance->SE->DelFd(CheckDupeSocket);
 942                                 CheckDupeSocket->Close();
 943                                 return false;
 944                         }
 945                         /* Check for fully initialized instances of the server by id */
 946                         Instance->Log(DEBUG,"Looking for dupe SID %s", sid.c_str());
 947                         TreeServer* CheckDupeSID = Utils->FindServerID(sid);
 948                         if (CheckDupeSID)
 949                         {
 950                                 this->SendError("Server ID "+CheckDupeSID->GetID()+" already exists on server "+CheckDupeSID->GetName()+"!");
 951                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server ID '"+CheckDupeSID->GetID()+
 952                                                 "' already exists on server "+CheckDupeSID->GetName());
 953                                 return false;
 954                         }
 955                         /* Now check for fully initialized instances of the server by name */
 956                         TreeServer* CheckDupe = Utils->FindServer(sname);
 957                         if (CheckDupe)
 958                         {
 959                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 960                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 961                                 return false;
 962                         }
 963                         this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 964                         if (this->Hook)
 965                         {
 966                                 std::string name = InspSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 967                                 this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 968                         }
 969
 970                         Utils->AddBurstingServer(sname,this);
 971
 972                         // this is good. Send our details: Our server name and description and hopcount of 0,
 973                         // along with the sendpass from this block.
 974                         this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+Instance->Config->GetSID()+" :"+this->Instance->Config->ServerDesc);
 975                         // move to the next state, we are now waiting for THEM.
 976                         this->LinkState = WAIT_AUTH_2;
 977                         return true;
 978                 }
 979         }
 980         this->SendError("Invalid credentials");
 981         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 982         return false;
 983 }
 984
 985 void TreeSocket::Split(const std::string &line, std::deque<std::string> &n)
 986 {
 987         n.clear();
 988         irc::tokenstream tokens(line);
 989         std::string param;
 990         while (tokens.GetToken(param))
 991         {
 992                 if (!param.empty())
 993                         n.push_back(param);
 994         }
 995         return;
 996 }
 997
 998 bool TreeSocket::ProcessLine(std::string &line)
 999 {
1000         std::deque<std::string> params;
1001         irc::string command;
1002         std::string prefix;
1003
1004         line = line.substr(0, line.find_first_of("\r\n"));
1005
1006         if (line.empty())
1007                 return true;
1008
1009         Instance->Log(DEBUG, "S[%d] I %s", this->GetFd(), line.c_str());
1010
1011         this->Split(line.c_str(),params);
1012
1013         if (params.empty())
1014                 return true;
1015
1016         if ((params[0][0] == ':') && (params.size() > 1))
1017         {
1018                 prefix = params[0].substr(1);
1019                 params.pop_front();
1020         }
1021         command = params[0].c_str();
1022         params.pop_front();
1023         switch (this->LinkState)
1024         {
1025                 TreeServer* Node;
1026
1027                 case WAIT_AUTH_1:
1028                         // Waiting for SERVER command from remote server. Server initiating
1029                         // the connection sends the first SERVER command, listening server
1030                         // replies with theirs if its happy, then if the initiator is happy,
1031                         // it starts to send its net sync, which starts the merge, otherwise
1032                         // it sends an ERROR.
1033                         if (command == "PASS")
1034                         {
1035                                 /* Silently ignored */
1036                         }
1037                         else if (command == "SERVER")
1038                         {
1039                                 return this->Inbound_Server(params);
1040                         }
1041                         else if (command == "ERROR")
1042                         {
1043                                 return this->Error(params);
1044                         }
1045                         else if (command == "USER")
1046                         {
1047                                 this->SendError("Client connections to this port are prohibited.");
1048                                 return false;
1049                         }
1050                         else if (command == "CAPAB")
1051                         {
1052                                 return this->Capab(params);
1053                         }
1054                         else
1055                         {
1056                                 irc::string error = "Invalid command in negotiation phase: " + command;
1057                                 this->SendError(assign(error));
1058                                 return false;
1059                         }
1060                 break;
1061                 case WAIT_AUTH_2:
1062                         // Waiting for start of other side's netmerge to say they liked our
1063                         // password.
1064                         if (command == "SERVER")
1065                         {
1066                                 // cant do this, they sent it to us in the WAIT_AUTH_1 state!
1067                                 // silently ignore.
1068                                 return true;
1069                         }
1070                         else if (command == "BURST")
1071                         {
1072                                 if (params.size() && Utils->EnableTimeSync)
1073                                 {
1074                                         bool we_have_delta = (Instance->Time(false) != Instance->Time(true));
1075                                         time_t them = atoi(params[0].c_str());
1076                                         time_t delta = them - Instance->Time(false);
1077                                         if ((delta < -600) || (delta > 600))
1078                                         {
1079                                                 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));
1080                                                 SendError("Your clocks are out by "+ConvToStr(abs(delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
1081                                                 return false;
1082                                         }
1083                                         else if ((delta < -30) || (delta > 30))
1084                                         {
1085                                                 Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs(delta));
1086                                         }
1087
1088                                         if (!Utils->MasterTime && !we_have_delta)
1089                                         {
1090                                                 this->Instance->SetTimeDelta(delta);
1091                                                 // Send this new timestamp to any other servers
1092                                                 Utils->DoOneToMany(Instance->Config->GetSID(), "TIMESET", params);
1093                                         }
1094                                 }
1095                                 this->LinkState = CONNECTED;
1096                                 Link* lnk = Utils->FindLink(InboundServerName);
1097
1098                                 Node = new TreeServer(this->Utils, this->Instance, InboundServerName, InboundDescription, InboundSID, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
1099
1100                                 if (Node->DuplicateID())
1101                                 {
1102                                         this->SendError("Server ID "+InboundSID+" already exists on the network!");
1103                                         this->Instance->SNO->WriteToSnoMask('l',"Server \2"+InboundServerName+"\2 being introduced from \2" + prefix + "\2 denied, server ID already exists on the network. Closing link.");
1104                                         return false;
1105                                 }
1106                                 Utils->DelBurstingServer(this);
1107                                 Utils->TreeRoot->AddChild(Node);
1108                                 params.clear();
1109                                 params.push_back(InboundServerName);
1110                                 params.push_back("*");
1111                                 params.push_back("1");
1112                                 params.push_back(InboundSID);
1113                                 params.push_back(":"+InboundDescription);
1114                                 Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,InboundServerName);
1115                                 this->bursting = true;
1116                                 this->DoBurst(Node);
1117                         }
1118                         else if (command == "ERROR")
1119                         {
1120                                 return this->Error(params);
1121                         }
1122                         else if (command == "CAPAB")
1123                         {
1124                                 return this->Capab(params);
1125                         }
1126
1127                 break;
1128                 case LISTENER:
1129                         this->SendError("Internal error -- listening socket accepted its own descriptor!!!");
1130                         return false;
1131                 break;
1132                 case CONNECTING:
1133                         if (command == "SERVER")
1134                         {
1135                                 // another server we connected to, which was in WAIT_AUTH_1 state,
1136                                 // has just sent us their credentials. If we get this far, theyre
1137                                 // happy with OUR credentials, and they are now in WAIT_AUTH_2 state.
1138                                 // if we're happy with this, we should send our netburst which
1139                                 // kickstarts the merge.
1140                                 return this->Outbound_Reply_Server(params);
1141                         }
1142                         else if (command == "ERROR")
1143                         {
1144                                 return this->Error(params);
1145                         }
1146                         else if (command == "CAPAB")
1147                         {
1148                                 return this->Capab(params);
1149                         }
1150                 break;
1151                 case CONNECTED:
1152                         // This is the 'authenticated' state, when all passwords
1153                         // have been exchanged and anything past this point is taken
1154                         // as gospel.
1155
1156                         if (!prefix.empty())
1157                         {
1158                                 std::string direction = prefix;
1159
1160                                 userrec *t = this->Instance->FindUUID(prefix);
1161                                 if (t)
1162                                 {
1163                                         direction = t->server;
1164                                 }
1165
1166                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
1167                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
1168                                 {
1169                                         if (route_back_again)
1170                                                 Instance->Log(DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
1171                                         return true;
1172                                 }
1173                                 /* Fix by brain:
1174                                  * When there is activity on the socket, reset the ping counter so
1175                                  * that we're not wasting bandwidth pinging an active server.
1176                                  */
1177                                 route_back_again->SetNextPingTime(time(NULL) + Utils->PingFreq);
1178                                 route_back_again->SetPingFlag();
1179                         }
1180                         else
1181                         {
1182                                 prefix = this->GetName();
1183                         }
1184
1185                         if ((command == "MODE") && (params.size() >= 2))
1186                         {
1187                                 chanrec* channel = Instance->FindChan(params[0]);
1188                                 if (channel)
1189                                 {
1190                                         userrec* x = Instance->FindNick(prefix);
1191                                         if (x)
1192                                         {
1193                                                 if (warned.find(x->server) == warned.end())
1194                                                 {
1195                                                         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);
1196                                                         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());
1197                                                         warned[x->server] = x->nick;
1198                                                 }
1199                                         }
1200                                 }
1201                         }
1202
1203                         if (command == "SVSMODE")
1204                         {
1205                                 /* Services expects us to implement
1206                                  * SVSMODE. In inspircd its the same as
1207                                  * MODE anyway.
1208                                  */
1209                                 command = "MODE";
1210                         }
1211                         std::string target;
1212                         /* Yes, know, this is a mess. Its reasonably fast though as we're
1213                          * working with std::string here.
1214                          */
1215                         if (command == "UID")
1216                         {
1217                                 return this->ParseUID(prefix, params);
1218                         }
1219                         else if (command == "FJOIN")
1220                         {
1221                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1222                                 if (ServerSource)
1223                                         Utils->SetRemoteBursting(ServerSource, false);
1224                                 return this->ForceJoin(prefix,params);
1225                         }
1226                         else if (command == "STATS")
1227                         {
1228                                 return this->Stats(prefix, params);
1229                         }
1230                         else if (command == "MOTD")
1231                         {
1232                                 return this->Motd(prefix, params);
1233                         }
1234                         else if (command == "KILL" && Utils->IsServer(prefix))
1235                         {
1236                                 return this->RemoteKill(prefix,params);
1237                         }
1238                         else if (command == "MODULES")
1239                         {
1240                                 return this->Modules(prefix, params);
1241                         }
1242                         else if (command == "ADMIN")
1243                         {
1244                                 return this->Admin(prefix, params);
1245                         }
1246                         else if (command == "SERVER")
1247                         {
1248                                 return this->RemoteServer(prefix,params);
1249                         }
1250                         else if (command == "ERROR")
1251                         {
1252                                 return this->Error(params);
1253                         }
1254                         else if (command == "OPERTYPE")
1255                         {
1256                                 return this->OperType(prefix,params);
1257                         }
1258                         else if (command == "FMODE")
1259                         {
1260                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1261                                 if (ServerSource)
1262                                         Utils->SetRemoteBursting(ServerSource, false);
1263                                 return this->ForceMode(prefix,params);
1264                         }
1265                         else if (command == "FTOPIC")
1266                         {
1267                                 return this->ForceTopic(prefix,params);
1268                         }
1269                         else if (command == "REHASH")
1270                         {
1271                                 return this->RemoteRehash(prefix,params);
1272                         }
1273                         else if (command == "METADATA")
1274                         {
1275                                 return this->MetaData(prefix,params);
1276                         }
1277                         else if (command == "REMSTATUS")
1278                         {
1279                                 return this->RemoveStatus(prefix,params);
1280                         }
1281                         else if (command == "PING")
1282                         {
1283                                 if (prefix.empty())
1284                                         prefix = this->GetName();
1285                                 /*
1286                                  * We just got a ping from a server that's bursting.
1287                                  * This can't be right, so set them to not bursting, and
1288                                  * apply their lines.
1289                                  */
1290                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1291                                 if (ServerSource)
1292                                         Utils->SetRemoteBursting(ServerSource, false);
1293
1294                                 if (this->bursting)
1295                                 {
1296                                         this->bursting = false;
1297                                         Instance->XLines->apply_lines(Utils->lines_to_apply);
1298                                         Utils->lines_to_apply = 0;
1299                                 }
1300
1301                                 return this->LocalPing(prefix,params);
1302                         }
1303                         else if (command == "PONG")
1304                         {
1305                                 if (prefix.empty())
1306                                         prefix = this->GetName();
1307                                 /*
1308                                  * We just got a pong from a server that's bursting.
1309                                  * This can't be right, so set them to not bursting, and
1310                                  * apply their lines.
1311                                  */
1312                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1313                                 if (ServerSource)
1314                                         Utils->SetRemoteBursting(ServerSource, false);
1315
1316                                 if (this->bursting)
1317                                 {
1318                                         this->bursting = false;
1319                                         Instance->XLines->apply_lines(Utils->lines_to_apply);
1320                                         Utils->lines_to_apply = 0;
1321                                 }
1322
1323                                 return this->LocalPong(prefix,params);
1324                         }
1325                         else if (command == "VERSION")
1326                         {
1327                                 return this->ServerVersion(prefix,params);
1328                         }
1329                         else if (command == "FHOST")
1330                         {
1331                                 return this->ChangeHost(prefix,params);
1332                         }
1333                         else if (command == "FNAME")
1334                         {
1335                                 return this->ChangeName(prefix,params);
1336                         }
1337                         else if (command == "ADDLINE")
1338                         {
1339                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1340                                 if (ServerSource)
1341                                         Utils->SetRemoteBursting(ServerSource, false);
1342                                 return this->AddLine(prefix,params);
1343                         }
1344                         else if (command == "SVSNICK")
1345                         {
1346                                 if (prefix.empty())
1347                                 {
1348                                         prefix = this->GetName();
1349                                 }
1350                                 return this->ForceNick(prefix,params);
1351                         }
1352                         else if (command == "OPERQUIT")
1353                         {
1354                                 return this->OperQuit(prefix,params);
1355                         }
1356                         else if (command == "IDLE")
1357                         {
1358                                 return this->Whois(prefix,params);
1359                         }
1360                         else if (command == "PUSH")
1361                         {
1362                                 return this->Push(prefix,params);
1363                         }
1364                         else if (command == "TIMESET")
1365                         {
1366                                 return this->HandleSetTime(prefix, params);
1367                         }
1368                         else if (command == "TIME")
1369                         {
1370                                 return this->Time(prefix,params);
1371                         }
1372                         else if ((command == "KICK") && (Utils->IsServer(prefix)))
1373                         {
1374                                 std::string sourceserv = this->myhost;
1375                                 if (params.size() == 3)
1376                                 {
1377                                         userrec* user = this->Instance->FindNick(params[1]);
1378                                         chanrec* chan = this->Instance->FindChan(params[0]);
1379                                         if (user && chan)
1380                                         {
1381                                                 if (!chan->ServerKickUser(user, params[2].c_str(), false))
1382                                                         /* Yikes, the channels gone! */
1383                                                         delete chan;
1384                                         }
1385                                 }
1386                                 if (!this->InboundServerName.empty())
1387                                 {
1388                                         sourceserv = this->InboundServerName;
1389                                 }
1390                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1391                         }
1392                         else if (command == "SVSJOIN")
1393                         {
1394                                 if (prefix.empty())
1395                                 {
1396                                         prefix = this->GetName();
1397                                 }
1398                                 return this->ServiceJoin(prefix,params);
1399                         }
1400                         else if (command == "SQUIT")
1401                         {
1402                                 if (params.size() == 2)
1403                                 {
1404                                         this->Squit(Utils->FindServer(params[0]),params[1]);
1405                                 }
1406                                 return true;
1407                         }
1408                         else if (command == "OPERNOTICE")
1409                         {
1410                                 std::string sourceserv = this->myhost;
1411                                 if (!this->InboundServerName.empty())
1412                                         sourceserv = this->InboundServerName;
1413                                 if (params.size() >= 1)
1414                                         Instance->WriteOpers("*** From " + sourceserv + ": " + params[0]);
1415                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1416                         }
1417                         else if (command == "MODENOTICE")
1418                         {
1419                                 std::string sourceserv = this->myhost;
1420                                 if (!this->InboundServerName.empty())
1421                                         sourceserv = this->InboundServerName;
1422                                 if (params.size() >= 2)
1423                                 {
1424                                         Instance->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", sourceserv.c_str(), params[1].c_str());
1425                                 }
1426                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1427                         }
1428                         else if (command == "SNONOTICE")
1429                         {
1430                                 std::string sourceserv = this->myhost;
1431                                 if (!this->InboundServerName.empty())
1432                                         sourceserv = this->InboundServerName;
1433                                 if (params.size() >= 2)
1434                                 {
1435                                         Instance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + sourceserv + ": "+ params[1]);
1436                                 }
1437                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1438                         }
1439                         else if (command == "ENDBURST")
1440                         {
1441                                 this->bursting = false;
1442                                 Instance->XLines->apply_lines(Utils->lines_to_apply);
1443                                 Utils->lines_to_apply = 0;
1444                                 std::string sourceserv = this->myhost;
1445                                 if (!this->InboundServerName.empty())
1446                                         sourceserv = this->InboundServerName;
1447                                 this->Instance->SNO->WriteToSnoMask('l',"Received end of netburst from \2%s\2",sourceserv.c_str());
1448
1449                                 Event rmode((char*)sourceserv.c_str(), (Module*)Utils->Creator, "new_server");
1450                                 rmode.Send(Instance);
1451
1452                                 return true;
1453                         }
1454                         else
1455                         {
1456                                 /*
1457                                  * Not a special s2s command. Emulate the user doing it.
1458                                  * This saves us having a huge ugly command parser again.
1459                                  */
1460                                 userrec *who = this->Instance->FindUUID(prefix);
1461
1462                                 std::string sourceserv = this->myhost;
1463                                 if (!this->InboundServerName.empty())
1464                                 {
1465                                         sourceserv = this->InboundServerName;
1466                                 }
1467                                 if ((!who) && (command == "MODE"))
1468                                 {
1469                                         if (Utils->IsServer(prefix))
1470                                         {
1471                                                 const char* modelist[MAXPARAMETERS];
1472                                                 for (size_t i = 0; i < params.size(); i++)
1473                                                         modelist[i] = params[i].c_str();
1474                                                 this->Instance->SendMode(modelist, params.size(), this->Instance->FakeClient);
1475                                                 /* Hot potato! pass it on! */
1476                                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1477                                         }
1478                                 }
1479                                 if (who)
1480                                 {
1481                                         if ((command == "NICK") && (params.size() > 0))
1482                                         {
1483                                                 /* On nick messages, check that the nick doesnt
1484                                                  * already exist here. If it does, kill their copy,
1485                                                  * and our copy.
1486                                                  */
1487                                                 userrec* x = this->Instance->FindNickOnly(params[0]);
1488                                                 if ((x) && (x != who))
1489                                                 {
1490                                                         int collideret = 0;
1491                                                         /* x is local, who is remote */
1492                                                         collideret = this->DoCollision(x, who->age, who->ident, who->GetIPString(), who->uuid);
1493                                                         if (collideret != 1)
1494                                                         {
1495                                                                 /*
1496                                                                  * Remote client lost, or both lost,
1497                                                                  * parsing this nickchange would be
1498                                                                  * pointless, as the incoming client's
1499                                                                  * server will soon recieve SVSNICK to
1500                                                                  * change its nick to its UID. :)
1501                                                                  *   -- w00t
1502                                                                  */
1503                                                                 return true;
1504                                                         }
1505 /*
1506 Old nickname collision logic..
1507                                                         std::deque<std::string> p;
1508                                                         p.push_back(params[0]);
1509                                                         p.push_back(":Nickname collision ("+prefix+" -> "+params[0]+")");
1510                                                         Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
1511                                                         p.clear();
1512                                                         p.push_back(prefix);
1513                                                         p.push_back(":Nickname collision");
1514                                                         Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
1515                                                         userrec::QuitUser(this->Instance,x,"Nickname collision ("+prefix+" -> "+params[0]+")");
1516                                                         userrec* y = this->Instance->FindNick(prefix);
1517                                                         if (y)
1518                                                         {
1519                                                                 userrec::QuitUser(this->Instance,y,"Nickname collision");
1520                                                         }
1521                                                         return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1522 */
1523                                                 }
1524                                         }
1525                                         // its a user
1526                                         target = who->server;
1527                                         const char* strparams[127];
1528                                         for (unsigned int q = 0; q < params.size(); q++)
1529                                         {
1530                                                 strparams[q] = params[q].c_str();
1531                                         }
1532                                         switch (this->Instance->CallCommandHandler(command.c_str(), strparams, params.size(), who))
1533                                         {
1534                                                 case CMD_INVALID:
1535                                                         this->SendError("Unrecognised command '"+std::string(command.c_str())+"' -- possibly loaded mismatched modules");
1536                                                         return false;
1537                                                 break;
1538                                                 case CMD_FAILURE:
1539                                                         return true;
1540                                                 break;
1541                                                 default:
1542                                                         /* CMD_SUCCESS and CMD_USER_DELETED fall through here */
1543                                                 break;
1544                                         }
1545                                 }
1546                                 else
1547                                 {
1548                                         // its not a user. Its either a server, or somethings screwed up.
1549                                         if (Utils->IsServer(prefix))
1550                                                 target = this->Instance->Config->GetID();
1551                                         else
1552                                                 return true;
1553                                 }
1554                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1555
1556                         }
1557                         return true;
1558                 break;
1559         }
1560         return true;
1561 }
1562
1563 std::string TreeSocket::GetName()
1564 {
1565         std::string sourceserv = this->myhost;
1566         if (!this->InboundServerName.empty())
1567         {
1568                 sourceserv = this->InboundServerName;
1569         }
1570         return sourceserv;
1571 }
1572
1573 void TreeSocket::OnTimeout()
1574 {
1575         if (this->LinkState == CONNECTING)
1576         {
1577                 Utils->Creator->RemoteMessage(NULL, "CONNECT: Connection to \002%s\002 timed out.", myhost.c_str());
1578                 Link* MyLink = Utils->FindLink(myhost);
1579                 if (MyLink)
1580                         Utils->DoFailOver(MyLink);
1581         }
1582 }
1583
1584 void TreeSocket::OnClose()
1585 {
1586         if (this->LinkState == LISTENER)
1587                 return;
1588
1589         // Connection closed.
1590         // If the connection is fully up (state CONNECTED)
1591         // then propogate a netsplit to all peers.
1592         std::string quitserver = this->myhost;
1593         if (!this->InboundServerName.empty())
1594         {
1595                 quitserver = this->InboundServerName;
1596         }
1597         TreeServer* s = Utils->FindServer(quitserver);
1598         if (s)
1599         {
1600                 Squit(s,"Remote host closed the connection");
1601         }
1602
1603         if (!quitserver.empty())
1604         {
1605                 Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' failed.",quitserver.c_str());
1606                 time_t server_uptime = Instance->Time() - this->age;
1607                 if (server_uptime)
1608                         Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
1609         }
1610 }
1611
1612 int TreeSocket::OnIncomingConnection(int newsock, char* ip)
1613 {
1614         /* To prevent anyone from attempting to flood opers/DDoS by connecting to the server port,
1615          * or discovering if this port is the server port, we don't allow connections from any
1616          * IPs for which we don't have a link block.
1617          */
1618         bool found = false;
1619
1620         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
1621         if (!found)
1622         {
1623                 for (vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
1624                         if (irc::sockets::MatchCIDR(ip, (*i).c_str()))
1625                                 found = true;
1626
1627                 if (!found)
1628                 {
1629                         Utils->Creator->RemoteMessage(NULL,"Server connection from %s denied (no link blocks with that IP address)", ip);
1630                         close(newsock);
1631                         return false;
1632                 }
1633         }
1634
1635         TreeSocket* s = new TreeSocket(this->Utils, this->Instance, newsock, ip, this->Hook);
1636         s = s; /* Whinge whinge whinge, thats all GCC ever does. */
1637         return true;
1638 }