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.empty() ? 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
 249                 TreeServer* remoteserver=Utils->FindServer(u->server);
 250                 bool dosend = true;
 251
 252                 if (this->Utils->quiet_bursts)
 253                 {
 254                         /*
 255                          * If quiet bursts are enabled, and server is bursting or silent uline (i.e. services),
 256                          * then do nothing. -- w00t
 257                          */
 258                         if (
 259                                 this->bursting ||
 260                                 Utils->FindRemoteBurstServer(remoteserver) ||
 261                                 this->Instance->SilentULine(this->Instance->FindServerNamePtr(u->server))
 262                            )
 263                         {
 264                                 dosend = false;
 265                         }
 266                 }
 267
 268                 if (dosend)
 269                         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()));
 270         }
 271         return true;
 272 }
 273
 274 /** Because Andy insists that services-compatible servers must
 275  * implement SVSNICK and SVSJOIN, that's exactly what we do :p
 276  */
 277 bool TreeSocket::ForceNick(const std::string &prefix, std::deque<std::string> &params)
 278 {
 279         if (params.size() < 3)
 280                 return true;
 281
 282         userrec* u = this->Instance->FindNick(params[0]);
 283
 284         if (u)
 285         {
 286                 Utils->DoOneToAllButSender(prefix,"SVSNICK",params,prefix);
 287
 288                 if (IS_LOCAL(u))
 289                 {
 290                         std::deque<std::string> par;
 291                         par.push_back(params[1]);
 292
 293                         if (!u->ForceNickChange(params[1].c_str()))
 294                         {
 295                                 /* buh. UID them */
 296                                 if (!u->ForceNickChange(u->uuid))
 297                                 {
 298                                         userrec::QuitUser(this->Instance, u, "Nickname collision");
 299                                         return true;
 300                                 }
 301                         }
 302
 303                         u->age = atoi(params[2].c_str());
 304                 }
 305         }
 306
 307         return true;
 308 }
 309
 310 bool TreeSocket::OperQuit(const std::string &prefix, std::deque<std::string> &params)
 311 {
 312         if (params.size() < 1)
 313                 return true;
 314
 315         userrec* u = this->Instance->FindNick(prefix);
 316
 317         if (u)
 318         {
 319                 u->SetOperQuit(params[0]);
 320                 params[0] = ":" + params[0];
 321                 Utils->DoOneToAllButSender(prefix,"OPERQUIT",params,prefix);
 322         }
 323         return true;
 324 }
 325
 326 bool TreeSocket::ServiceJoin(const std::string &prefix, std::deque<std::string> &params)
 327 {
 328         if (params.size() < 2)
 329                 return true;
 330
 331         if (!this->Instance->IsChannel(params[1].c_str()))
 332                 return true;
 333
 334         userrec* u = this->Instance->FindNick(params[0]);
 335
 336         if (u)
 337         {
 338                 /* only join if it's local, otherwise just pass it on! */
 339                 if (IS_LOCAL(u))
 340                         chanrec::JoinUser(this->Instance, u, params[1].c_str(), false, "", Instance->Time());
 341                 Utils->DoOneToAllButSender(prefix,"SVSJOIN",params,prefix);
 342         }
 343         return true;
 344 }
 345
 346 bool TreeSocket::RemoteRehash(const std::string &prefix, std::deque<std::string> &params)
 347 {
 348         if (params.size() < 1)
 349                 return false;
 350
 351         std::string servermask = params[0];
 352
 353         if (this->Instance->MatchText(this->Instance->Config->ServerName,servermask))
 354         {
 355                 this->Instance->SNO->WriteToSnoMask('l',"Remote rehash initiated by \002"+prefix+"\002.");
 356                 this->Instance->RehashServer();
 357                 Utils->ReadConfiguration(false);
 358                 InitializeDisabledCommands(Instance->Config->DisabledCommands, Instance);
 359         }
 360         Utils->DoOneToAllButSender(prefix,"REHASH",params,prefix);
 361         return true;
 362 }
 363
 364 bool TreeSocket::RemoteKill(const std::string &prefix, std::deque<std::string> &params)
 365 {
 366         if (params.size() != 2)
 367                 return true;
 368
 369         userrec* who = this->Instance->FindNick(params[0]);
 370
 371         if (who)
 372         {
 373                 /* Prepend kill source, if we don't have one */
 374                 if (*(params[1].c_str()) != '[')
 375                 {
 376                         params[1] = "[" + prefix + "] Killed (" + params[1] +")";
 377                 }
 378                 std::string reason = params[1];
 379                 params[1] = ":" + params[1];
 380                 Utils->DoOneToAllButSender(prefix,"KILL",params,prefix);
 381                 // NOTE: This is safe with kill hiding on, as RemoteKill is only reached if we have a server prefix.
 382                 // in short this is not executed for USERS.
 383                 who->Write(":%s KILL %s :%s (%s)", prefix.c_str(), who->nick, prefix.c_str(), reason.c_str());
 384                 userrec::QuitUser(this->Instance,who,reason);
 385         }
 386         return true;
 387 }
 388
 389 bool TreeSocket::LocalPong(const std::string &prefix, std::deque<std::string> &params)
 390 {
 391         if (params.size() < 1)
 392                 return true;
 393
 394         if (params.size() == 1)
 395         {
 396                 TreeServer* ServerSource = Utils->FindServer(prefix);
 397                 if (ServerSource)
 398                 {
 399                         ServerSource->SetPingFlag();
 400                         timeval t;
 401                         gettimeofday(&t, NULL);
 402                         long ts = (t.tv_sec * 1000) + (t.tv_usec / 1000);
 403                         ServerSource->rtt = ts - ServerSource->LastPingMsec;
 404                 }
 405         }
 406         else
 407         {
 408                 std::string forwardto = params[1];
 409                 if (forwardto == this->Instance->Config->ServerName)
 410                 {
 411                         /*
 412                          * this is a PONG for us
 413                          * if the prefix is a user, check theyre local, and if they are,
 414                          * dump the PONG reply back to their fd. If its a server, do nowt.
 415                          * Services might want to send these s->s, but we dont need to yet.
 416                          */
 417                         userrec* u = this->Instance->FindNick(prefix);
 418                         if (u)
 419                         {
 420                                 u->WriteServ("PONG %s %s",params[0].c_str(),params[1].c_str());
 421                         }
 422                 }
 423                 else
 424                 {
 425                         // not for us, pass it on :)
 426                         Utils->DoOneToOne(prefix,"PONG",params,forwardto);
 427                 }
 428         }
 429
 430         return true;
 431 }
 432
 433 bool TreeSocket::MetaData(const std::string &prefix, std::deque<std::string> &params)
 434 {
 435         if (params.size() < 2)
 436                 return true;
 437         else if (params.size() < 3)
 438                 params.push_back("");
 439         TreeServer* ServerSource = Utils->FindServer(prefix);
 440         if (ServerSource)
 441         {
 442                 Utils->SetRemoteBursting(ServerSource, false);
 443
 444                 if (params[0] == "*")
 445                 {
 446                         FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_OTHER,NULL,params[1],params[2]));
 447                 }
 448                 else if (*(params[0].c_str()) == '#')
 449                 {
 450                         chanrec* c = this->Instance->FindChan(params[0]);
 451                         if (c)
 452                         {
 453                                 FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_CHANNEL,c,params[1],params[2]));
 454                         }
 455                 }
 456                 else if (*(params[0].c_str()) != '#')
 457                 {
 458                         userrec* u = this->Instance->FindNick(params[0]);
 459                         if (u)
 460                         {
 461                                 FOREACH_MOD_I(this->Instance,I_OnDecodeMetaData,OnDecodeMetaData(TYPE_USER,u,params[1],params[2]));
 462                         }
 463                 }
 464         }
 465
 466         params[2] = ":" + params[2];
 467         Utils->DoOneToAllButSender(prefix,"METADATA",params,prefix);
 468         return true;
 469 }
 470
 471 bool TreeSocket::ServerVersion(const std::string &prefix, std::deque<std::string> &params)
 472 {
 473         if (params.size() < 1)
 474                 return true;
 475
 476         TreeServer* ServerSource = Utils->FindServer(prefix);
 477
 478         if (ServerSource)
 479         {
 480                 ServerSource->SetVersion(params[0]);
 481         }
 482         params[0] = ":" + params[0];
 483         Utils->DoOneToAllButSender(prefix,"VERSION",params,prefix);
 484         return true;
 485 }
 486
 487 bool TreeSocket::ChangeHost(const std::string &prefix, std::deque<std::string> &params)
 488 {
 489         if (params.size() < 1)
 490                 return true;
 491         userrec* u = this->Instance->FindNick(prefix);
 492
 493         if (u)
 494         {
 495                 u->ChangeDisplayedHost(params[0].c_str());
 496                 Utils->DoOneToAllButSender(prefix,"FHOST",params,u->server);
 497         }
 498         return true;
 499 }
 500
 501 bool TreeSocket::AddLine(const std::string &prefix, std::deque<std::string> &params)
 502 {
 503         if (params.size() < 6)
 504                 return true;
 505         bool propogate = false;
 506         if (!this->bursting)
 507                 Utils->lines_to_apply = 0;
 508         switch (*(params[0].c_str()))
 509         {
 510                 case 'Z':
 511                         propogate = Instance->XLines->add_zline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 512                         Instance->XLines->zline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 513                         if (propogate)
 514                                 Utils->lines_to_apply |= APPLY_ZLINES;
 515                 break;
 516                 case 'Q':
 517                         propogate = Instance->XLines->add_qline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 518                         Instance->XLines->qline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 519                         if (propogate)
 520                                 Utils->lines_to_apply |= APPLY_QLINES;
 521                 break;
 522                 case 'E':
 523                         propogate = Instance->XLines->add_eline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 524                         Instance->XLines->eline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 525                 break;
 526                 case 'G':
 527                         propogate = Instance->XLines->add_gline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 528                         Instance->XLines->gline_set_creation_time(params[1].c_str(), atoi(params[3].c_str()));
 529                         if (propogate)
 530                                 Utils->lines_to_apply |= APPLY_GLINES;
 531                 break;
 532                 case 'K':
 533                         propogate = Instance->XLines->add_kline(atoi(params[4].c_str()), params[2].c_str(), params[5].c_str(), params[1].c_str());
 534                         if (propogate)
 535                                 Utils->lines_to_apply |= APPLY_KLINES;
 536                 break;
 537                 default:
 538                         /* Just in case... */
 539                         this->Instance->SNO->WriteToSnoMask('x',"\2WARNING\2: Invalid xline type '"+params[0]+"' sent by server "+prefix+", ignored!");
 540                         propogate = false;
 541                 break;
 542         }
 543         /* Send it on its way */
 544         if (propogate)
 545         {
 546                 if (atoi(params[4].c_str()))
 547                 {
 548                         time_t c_requires_crap = ConvToInt(params[4]) + Instance->Time();
 549                         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());
 550                 }
 551                 else
 552                 {
 553                         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());
 554                 }
 555                 params[5] = ":" + params[5];
 556                 Utils->DoOneToAllButSender(prefix,"ADDLINE",params,prefix);
 557         }
 558         if (!this->bursting)
 559         {
 560                 Instance->XLines->apply_lines(Utils->lines_to_apply);
 561                 Utils->lines_to_apply = 0;
 562         }
 563         return true;
 564 }
 565
 566 bool TreeSocket::ChangeName(const std::string &prefix, std::deque<std::string> &params)
 567 {
 568         if (params.size() < 1)
 569                 return true;
 570         userrec* u = this->Instance->FindNick(prefix);
 571         if (u)
 572         {
 573                 u->ChangeName(params[0].c_str());
 574                 params[0] = ":" + params[0];
 575                 Utils->DoOneToAllButSender(prefix,"FNAME",params,u->server);
 576         }
 577         return true;
 578 }
 579
 580 bool TreeSocket::Whois(const std::string &prefix, std::deque<std::string> &params)
 581 {
 582         if (params.size() < 1)
 583                 return true;
 584         userrec* u = this->Instance->FindNick(prefix);
 585         if (u)
 586         {
 587                 // an incoming request
 588                 if (params.size() == 1)
 589                 {
 590                         userrec* x = this->Instance->FindNick(params[0]);
 591                         if ((x) && (IS_LOCAL(x)))
 592                         {
 593                                 userrec* x = this->Instance->FindNick(params[0]);
 594                                 char signon[MAXBUF];
 595                                 char idle[MAXBUF];
 596                                 snprintf(signon, MAXBUF, "%lu", (unsigned long)x->signon);
 597                                 snprintf(idle, MAXBUF, "%lu", (unsigned long)abs((x->idle_lastmsg) - Instance->Time(true)));
 598                                 std::deque<std::string> par;
 599                                 par.push_back(prefix);
 600                                 par.push_back(signon);
 601                                 par.push_back(idle);
 602                                 // ours, we're done, pass it BACK
 603                                 Utils->DoOneToOne(params[0], "IDLE", par, u->server);
 604                         }
 605                         else
 606                         {
 607                                 // not ours pass it on
 608                                 if (x)
 609                                         Utils->DoOneToOne(prefix, "IDLE", params, x->server);
 610                         }
 611                 }
 612                 else if (params.size() == 3)
 613                 {
 614                         std::string who_did_the_whois = params[0];
 615                         userrec* who_to_send_to = this->Instance->FindNick(who_did_the_whois);
 616                         if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
 617                         {
 618                                 // an incoming reply to a whois we sent out
 619                                 std::string nick_whoised = prefix;
 620                                 unsigned long signon = atoi(params[1].c_str());
 621                                 unsigned long idle = atoi(params[2].c_str());
 622                                 if ((who_to_send_to) && (IS_LOCAL(who_to_send_to)))
 623                                 {
 624                                         do_whois(this->Instance, who_to_send_to, u, signon, idle, nick_whoised.c_str());
 625                                 }
 626                         }
 627                         else
 628                         {
 629                                 // not ours, pass it on
 630                                 if (who_to_send_to)
 631                                         Utils->DoOneToOne(prefix, "IDLE", params, who_to_send_to->server);
 632                         }
 633                 }
 634         }
 635         return true;
 636 }
 637
 638 bool TreeSocket::Push(const std::string &prefix, std::deque<std::string> &params)
 639 {
 640         if (params.size() < 2)
 641                 return true;
 642         userrec* u = this->Instance->FindNick(params[0]);
 643         if (!u)
 644                 return true;
 645         if (IS_LOCAL(u))
 646         {
 647                 u->Write(params[1]);
 648         }
 649         else
 650         {
 651                 // continue the raw onwards
 652                 params[1] = ":" + params[1];
 653                 Utils->DoOneToOne(prefix,"PUSH",params,u->server);
 654         }
 655         return true;
 656 }
 657
 658 bool TreeSocket::HandleSetTime(const std::string &prefix, std::deque<std::string> &params)
 659 {
 660         if (!params.size() || !Utils->EnableTimeSync)
 661                 return true;
 662
 663         bool force = false;
 664
 665         if ((params.size() == 2) && (params[1] == "FORCE"))
 666                 force = true;
 667
 668         time_t them = atoi(params[0].c_str());
 669         time_t us = Instance->Time(false);
 670
 671         time_t diff = them - us;
 672
 673         Utils->DoOneToAllButSender(prefix, "TIMESET", params, prefix);
 674
 675         if (force || (them != us))
 676         {
 677                 time_t old = Instance->SetTimeDelta(diff);
 678                 Instance->Log(DEBUG, "TS (diff %d) from %s applied (old delta was %d)", diff, prefix.c_str(), old);
 679         }
 680
 681         return true;
 682 }
 683
 684 bool TreeSocket::Time(const std::string &prefix, std::deque<std::string> &params)
 685 {
 686         // :source.server TIME remote.server sendernick
 687         // :remote.server TIME source.server sendernick TS
 688         if (params.size() == 2)
 689         {
 690                 // someone querying our time?
 691                 if (this->Instance->Config->ServerName == params[0])
 692                 {
 693                         userrec* u = this->Instance->FindNick(params[1]);
 694                         if (u)
 695                         {
 696                                 params.push_back(ConvToStr(Instance->Time(false)));
 697                                 params[0] = prefix;
 698                                 Utils->DoOneToOne(this->Instance->Config->ServerName,"TIME",params,params[0]);
 699                         }
 700                 }
 701                 else
 702                 {
 703                         // not us, pass it on
 704                         userrec* u = this->Instance->FindNick(params[1]);
 705                         if (u)
 706                                 Utils->DoOneToOne(prefix,"TIME",params,params[0]);
 707                 }
 708         }
 709         else if (params.size() == 3)
 710         {
 711                 // a response to a previous TIME
 712                 userrec* u = this->Instance->FindNick(params[1]);
 713                 if ((u) && (IS_LOCAL(u)))
 714                 {
 715                         time_t rawtime = atol(params[2].c_str());
 716                         struct tm * timeinfo;
 717                         timeinfo = localtime(&rawtime);
 718                         char tms[26];
 719                         snprintf(tms,26,"%s",asctime(timeinfo));
 720                         tms[24] = 0;
 721                         u->WriteServ("391 %s %s :%s",u->nick,prefix.c_str(),tms);
 722                 }
 723                 else
 724                 {
 725                         if (u)
 726                                 Utils->DoOneToOne(prefix,"TIME",params,u->server);
 727                 }
 728         }
 729         return true;
 730 }
 731
 732 bool TreeSocket::LocalPing(const std::string &prefix, std::deque<std::string> &params)
 733 {
 734         if (params.size() < 1)
 735                 return true;
 736         if (params.size() == 1)
 737         {
 738                 std::string stufftobounce = params[0];
 739                 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" PONG "+stufftobounce);
 740                 return true;
 741         }
 742         else
 743         {
 744                 std::string forwardto = params[1];
 745                 if (forwardto == this->Instance->Config->ServerName)
 746                 {
 747                         // this is a ping for us, send back PONG to the requesting server
 748                         params[1] = params[0];
 749                         params[0] = forwardto;
 750                         Utils->DoOneToOne(forwardto,"PONG",params,params[1]);
 751                 }
 752                 else
 753                 {
 754                         // not for us, pass it on :)
 755                         Utils->DoOneToOne(prefix,"PING",params,forwardto);
 756                 }
 757                 return true;
 758         }
 759 }
 760
 761 /** TODO: This creates a total mess of output and needs to really use irc::modestacker.
 762  */
 763 bool TreeSocket::RemoveStatus(const std::string &prefix, std::deque<std::string> &params)
 764 {
 765         if (params.size() < 1)
 766                 return true;
 767         chanrec* c = Instance->FindChan(params[0]);
 768         if (c)
 769         {
 770                 for (char modeletter = 'A'; modeletter <= 'z'; modeletter++)
 771                 {
 772                         ModeHandler* mh = Instance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
 773                         if (mh)
 774                                 mh->RemoveMode(c);
 775                 }
 776         }
 777         return true;
 778 }
 779
 780 bool TreeSocket::RemoteServer(const std::string &prefix, std::deque<std::string> &params)
 781 {
 782         if (params.size() < 5)
 783                 return false;
 784         std::string servername = params[0];
 785         std::string password = params[1];
 786         // hopcount is not used for a remote server, we calculate this ourselves
 787         std::string sid = params[3];
 788         std::string description = params[4];
 789         TreeServer* ParentOfThis = Utils->FindServer(prefix);
 790         if (!ParentOfThis)
 791         {
 792                 this->SendError("Protocol error - Introduced remote server from unknown server "+prefix);
 793                 return false;
 794         }
 795         TreeServer* CheckDupe = Utils->FindServer(servername);
 796         if (CheckDupe)
 797         {
 798                 this->SendError("Server "+servername+" already exists!");
 799                 this->Instance->SNO->WriteToSnoMask('l',"Server \2"+servername+"\2 being introduced from \2" + prefix + "\2 denied, already exists. Closing link with " + prefix);
 800                 return false;
 801         }
 802         Link* lnk = Utils->FindLink(servername);
 803         TreeServer* Node = new TreeServer(this->Utils, this->Instance, servername, description, sid, ParentOfThis,NULL, lnk ? lnk->Hidden : false);
 804         ParentOfThis->AddChild(Node);
 805         params[4] = ":" + params[4];
 806         Utils->SetRemoteBursting(Node, true);
 807         Utils->DoOneToAllButSender(prefix,"SERVER",params,prefix);
 808         this->Instance->SNO->WriteToSnoMask('l',"Server \002"+prefix+"\002 introduced server \002"+servername+"\002 ("+description+")");
 809         return true;
 810 }
 811
 812 bool TreeSocket::ComparePass(const std::string &ours, const std::string &theirs)
 813 {
 814         if ((!strncmp(ours.c_str(), "HMAC-SHA256:", 12)) || (!strncmp(theirs.c_str(), "HMAC-SHA256:", 12)))
 815         {
 816                 /* One or both of us specified hmac sha256, but we don't have sha256 module loaded!
 817                  * We can't allow this password as valid.
 818                  */
 819                 if (!Instance->FindModule("m_sha256.so") || !Utils->ChallengeResponse)
 820                                 return false;
 821                 else
 822                         /* Straight string compare of hashes */
 823                         return ours == theirs;
 824         }
 825         else
 826                 /* Straight string compare of plaintext */
 827                 return ours == theirs;
 828 }
 829
 830 bool TreeSocket::Outbound_Reply_Server(std::deque<std::string> &params)
 831 {
 832         if (params.size() < 5)
 833                 return false;
 834
 835         irc::string servername = params[0].c_str();
 836         std::string sname = params[0];
 837         std::string password = params[1];
 838         std::string sid = params[3];
 839         std::string description = params[4];
 840         int hops = atoi(params[2].c_str());
 841
 842         this->InboundServerName = sname;
 843         this->InboundDescription = description;
 844         this->InboundSID = sid;
 845
 846         if (!sentcapab)
 847                 this->SendCapabilities();
 848
 849         if (hops)
 850         {
 851                 this->SendError("Server too far away for authentication");
 852                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 853                 return false;
 854         }
 855
 856         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 857         {
 858                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password)) || (x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 859                 {
 860                         TreeServer* CheckDupe = Utils->FindServer(sname);
 861                         if (CheckDupe)
 862                         {
 863                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 864                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 865                                 return false;
 866                         }
 867                         // Begin the sync here. this kickstarts the
 868                         // other side, waiting in WAIT_AUTH_2 state,
 869                         // into starting their burst, as it shows
 870                         // that we're happy.
 871                         this->LinkState = CONNECTED;
 872                         // we should add the details of this server now
 873                         // to the servers tree, as a child of the root
 874                         // node.
 875                         TreeServer* Node = new TreeServer(this->Utils, this->Instance, sname, description, sid, Utils->TreeRoot, this, x->Hidden);
 876                         Utils->TreeRoot->AddChild(Node);
 877                         params[4] = ":" + params[4];
 878                         Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,sname);
 879                         this->bursting = true;
 880                         this->DoBurst(Node);
 881                         return true;
 882                 }
 883         }
 884         this->SendError("Invalid credentials");
 885         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 886         return false;
 887 }
 888
 889 bool TreeSocket::Inbound_Server(std::deque<std::string> &params)
 890 {
 891         if (params.size() < 5)
 892                 return false;
 893         irc::string servername = params[0].c_str();
 894         std::string sname = params[0];
 895         std::string password = params[1];
 896         std::string sid = params[3];
 897         std::string description = params[4];
 898         std::string OurSID;
 899         int hops = atoi(params[2].c_str());
 900
 901         this->InboundServerName = sname;
 902         this->InboundDescription = description;
 903         this->InboundSID = sid;
 904
 905         OurSID += (char)((Instance->Config->sid / 100) + 48);
 906         OurSID += (char)((Instance->Config->sid / 10) % 10 + 48);
 907         OurSID += (char)(Instance->Config->sid % 10 + 48);
 908
 909         if (!sentcapab)
 910                 this->SendCapabilities();
 911
 912         if (hops)
 913         {
 914                 this->SendError("Server too far away for authentication");
 915                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, server is too far away for authentication");
 916                 return false;
 917         }
 918
 919         for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
 920         {
 921                 if ((x->Name == servername) && ((ComparePass(this->MakePass(x->RecvPass,this->GetOurChallenge()),password) || x->RecvPass == password && (this->GetTheirChallenge().empty()))))
 922                 {
 923                         /* First check for instances of the server that are waiting between the inbound and outbound SERVER command */
 924                         TreeSocket* CheckDupeSocket = Utils->FindBurstingServer(sname);
 925                         if (CheckDupeSocket)
 926                         {
 927                                 /* If we find one, we abort the link to prevent a race condition */
 928                                 this->SendError("Negotiation collision");
 929                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists in a negotiating state.");
 930                                 CheckDupeSocket->SendError("Negotiation collision");
 931                                 Instance->SE->DelFd(CheckDupeSocket);
 932                                 CheckDupeSocket->Close();
 933                                 return false;
 934                         }
 935                         /* Now check for fully initialized instances of the server */
 936                         TreeServer* CheckDupe = Utils->FindServer(sname);
 937                         if (CheckDupe)
 938                         {
 939                                 this->SendError("Server "+sname+" already exists on server "+CheckDupe->GetParent()->GetName()+"!");
 940                                 this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, already exists on server "+CheckDupe->GetParent()->GetName());
 941                                 return false;
 942                         }
 943                         this->Instance->SNO->WriteToSnoMask('l',"Verified incoming server connection from \002"+sname+"\002["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] ("+description+")");
 944                         if (this->Hook)
 945                         {
 946                                 std::string name = InspSocketNameRequest((Module*)Utils->Creator, this->Hook).Send();
 947                                 this->Instance->SNO->WriteToSnoMask('l',"Connection from \2"+sname+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+name+"\2");
 948                         }
 949
 950                         Utils->AddBurstingServer(sname,this);
 951
 952                         // this is good. Send our details: Our server name and description and hopcount of 0,
 953                         // along with the sendpass from this block.
 954                         this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(x->SendPass, this->GetTheirChallenge())+" 0 "+OurSID+" :"+this->Instance->Config->ServerDesc);
 955                         // move to the next state, we are now waiting for THEM.
 956                         this->LinkState = WAIT_AUTH_2;
 957                         return true;
 958                 }
 959         }
 960         this->SendError("Invalid credentials");
 961         this->Instance->SNO->WriteToSnoMask('l',"Server connection from \2"+sname+"\2 denied, invalid link credentials");
 962         return false;
 963 }
 964
 965 void TreeSocket::Split(const std::string &line, std::deque<std::string> &n)
 966 {
 967         n.clear();
 968         irc::tokenstream tokens(line);
 969         std::string param;
 970         while (tokens.GetToken(param))
 971         {
 972                 if (!param.empty())
 973                         n.push_back(param);
 974         }
 975         return;
 976 }
 977
 978 bool TreeSocket::ProcessLine(std::string &line)
 979 {
 980         std::deque<std::string> params;
 981         irc::string command;
 982         std::string prefix;
 983
 984         line = line.substr(0, line.find_first_of("\r\n"));
 985
 986         if (line.empty())
 987                 return true;
 988
 989         Instance->Log(DEBUG, "S[%d] <- %s", this->GetFd(), line.c_str());
 990
 991         this->Split(line.c_str(),params);
 992
 993         if (params.empty())
 994                 return true;
 995
 996         if ((params[0][0] == ':') && (params.size() > 1))
 997         {
 998                 prefix = params[0].substr(1);
 999                 params.pop_front();
1000         }
1001         command = params[0].c_str();
1002         params.pop_front();
1003         switch (this->LinkState)
1004         {
1005                 TreeServer* Node;
1006
1007                 case WAIT_AUTH_1:
1008                         // Waiting for SERVER command from remote server. Server initiating
1009                         // the connection sends the first SERVER command, listening server
1010                         // replies with theirs if its happy, then if the initiator is happy,
1011                         // it starts to send its net sync, which starts the merge, otherwise
1012                         // it sends an ERROR.
1013                         if (command == "PASS")
1014                         {
1015                                 /* Silently ignored */
1016                         }
1017                         else if (command == "SERVER")
1018                         {
1019                                 return this->Inbound_Server(params);
1020                         }
1021                         else if (command == "ERROR")
1022                         {
1023                                 return this->Error(params);
1024                         }
1025                         else if (command == "USER")
1026                         {
1027                                 this->SendError("Client connections to this port are prohibited.");
1028                                 return false;
1029                         }
1030                         else if (command == "CAPAB")
1031                         {
1032                                 return this->Capab(params);
1033                         }
1034                         else
1035                         {
1036                                 irc::string error = "Invalid command in negotiation phase: " + command;
1037                                 this->SendError(assign(error));
1038                                 return false;
1039                         }
1040                 break;
1041                 case WAIT_AUTH_2:
1042                         // Waiting for start of other side's netmerge to say they liked our
1043                         // password.
1044                         if (command == "SERVER")
1045                         {
1046                                 // cant do this, they sent it to us in the WAIT_AUTH_1 state!
1047                                 // silently ignore.
1048                                 return true;
1049                         }
1050                         else if (command == "BURST")
1051                         {
1052                                 if (params.size() && Utils->EnableTimeSync)
1053                                 {
1054                                         bool we_have_delta = (Instance->Time(false) != Instance->Time(true));
1055                                         time_t them = atoi(params[0].c_str());
1056                                         time_t delta = them - Instance->Time(false);
1057                                         if ((delta < -600) || (delta > 600))
1058                                         {
1059                                                 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));
1060                                                 SendError("Your clocks are out by "+ConvToStr(abs(delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
1061                                                 return false;
1062                                         }
1063                                         else if ((delta < -30) || (delta > 30))
1064                                         {
1065                                                 Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs(delta));
1066                                         }
1067
1068                                         if (!Utils->MasterTime && !we_have_delta)
1069                                         {
1070                                                 this->Instance->SetTimeDelta(delta);
1071                                                 // Send this new timestamp to any other servers
1072                                                 Utils->DoOneToMany(Utils->TreeRoot->GetName(), "TIMESET", params);
1073                                         }
1074                                 }
1075                                 this->LinkState = CONNECTED;
1076                                 Link* lnk = Utils->FindLink(InboundServerName);
1077                                 Node = new TreeServer(this->Utils,this->Instance, InboundServerName, InboundDescription, InboundSID, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
1078                                 Utils->DelBurstingServer(this);
1079                                 Utils->TreeRoot->AddChild(Node);
1080                                 params.clear();
1081                                 params.push_back(InboundServerName);
1082                                 params.push_back("*");
1083                                 params.push_back("1");
1084                                 params.push_back(InboundSID);
1085                                 params.push_back(":"+InboundDescription);
1086                                 Utils->DoOneToAllButSender(Utils->TreeRoot->GetName(),"SERVER",params,InboundServerName);
1087                                 this->bursting = true;
1088                                 this->DoBurst(Node);
1089                         }
1090                         else if (command == "ERROR")
1091                         {
1092                                 return this->Error(params);
1093                         }
1094                         else if (command == "CAPAB")
1095                         {
1096                                 return this->Capab(params);
1097                         }
1098
1099                 break;
1100                 case LISTENER:
1101                         this->SendError("Internal error -- listening socket accepted its own descriptor!!!");
1102                         return false;
1103                 break;
1104                 case CONNECTING:
1105                         if (command == "SERVER")
1106                         {
1107                                 // another server we connected to, which was in WAIT_AUTH_1 state,
1108                                 // has just sent us their credentials. If we get this far, theyre
1109                                 // happy with OUR credentials, and they are now in WAIT_AUTH_2 state.
1110                                 // if we're happy with this, we should send our netburst which
1111                                 // kickstarts the merge.
1112                                 return this->Outbound_Reply_Server(params);
1113                         }
1114                         else if (command == "ERROR")
1115                         {
1116                                 return this->Error(params);
1117                         }
1118                         else if (command == "CAPAB")
1119                         {
1120                                 return this->Capab(params);
1121                         }
1122                 break;
1123                 case CONNECTED:
1124                         // This is the 'authenticated' state, when all passwords
1125                         // have been exchanged and anything past this point is taken
1126                         // as gospel.
1127
1128                         if (!prefix.empty())
1129                         {
1130                                 std::string direction = prefix;
1131
1132                                 userrec *t = this->Instance->FindUUID(prefix);
1133                                 if (t)
1134                                 {
1135                                         direction = t->server;
1136                                 }
1137
1138                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
1139                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
1140                                 {
1141                                         if (route_back_again)
1142                                                 Instance->Log(DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
1143                                         return true;
1144                                 }
1145                                 /* Fix by brain:
1146                                  * When there is activity on the socket, reset the ping counter so
1147                                  * that we're not wasting bandwidth pinging an active server.
1148                                  */
1149                                 route_back_again->SetNextPingTime(time(NULL) + Utils->PingFreq);
1150                                 route_back_again->SetPingFlag();
1151                         }
1152                         else
1153                         {
1154                                 prefix = this->GetName();
1155                         }
1156
1157                         if ((command == "MODE") && (params.size() >= 2))
1158                         {
1159                                 chanrec* channel = Instance->FindChan(params[0]);
1160                                 if (channel)
1161                                 {
1162                                         userrec* x = Instance->FindNick(prefix);
1163                                         if (x)
1164                                         {
1165                                                 if (warned.find(x->server) == warned.end())
1166                                                 {
1167                                                         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);
1168                                                         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());
1169                                                         warned[x->server] = x->nick;
1170                                                 }
1171                                         }
1172                                 }
1173                         }
1174
1175                         if (command == "SVSMODE")
1176                         {
1177                                 /* Services expects us to implement
1178                                  * SVSMODE. In inspircd its the same as
1179                                  * MODE anyway.
1180                                  */
1181                                 command = "MODE";
1182                         }
1183                         std::string target;
1184                         /* Yes, know, this is a mess. Its reasonably fast though as we're
1185                          * working with std::string here.
1186                          */
1187                         if (command == "UID")
1188                         {
1189                                 return this->ParseUID(prefix, params);
1190                         }
1191                         else if (command == "FJOIN")
1192                         {
1193                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1194                                 if (ServerSource)
1195                                         Utils->SetRemoteBursting(ServerSource, false);
1196                                 return this->ForceJoin(prefix,params);
1197                         }
1198                         else if (command == "STATS")
1199                         {
1200                                 return this->Stats(prefix, params);
1201                         }
1202                         else if (command == "MOTD")
1203                         {
1204                                 return this->Motd(prefix, params);
1205                         }
1206                         else if (command == "KILL" && Utils->IsServer(prefix))
1207                         {
1208                                 return this->RemoteKill(prefix,params);
1209                         }
1210                         else if (command == "MODULES")
1211                         {
1212                                 return this->Modules(prefix, params);
1213                         }
1214                         else if (command == "ADMIN")
1215                         {
1216                                 return this->Admin(prefix, params);
1217                         }
1218                         else if (command == "SERVER")
1219                         {
1220                                 return this->RemoteServer(prefix,params);
1221                         }
1222                         else if (command == "ERROR")
1223                         {
1224                                 return this->Error(params);
1225                         }
1226                         else if (command == "OPERTYPE")
1227                         {
1228                                 return this->OperType(prefix,params);
1229                         }
1230                         else if (command == "FMODE")
1231                         {
1232                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1233                                 if (ServerSource)
1234                                         Utils->SetRemoteBursting(ServerSource, false);
1235                                 return this->ForceMode(prefix,params);
1236                         }
1237                         else if (command == "FTOPIC")
1238                         {
1239                                 return this->ForceTopic(prefix,params);
1240                         }
1241                         else if (command == "REHASH")
1242                         {
1243                                 return this->RemoteRehash(prefix,params);
1244                         }
1245                         else if (command == "METADATA")
1246                         {
1247                                 return this->MetaData(prefix,params);
1248                         }
1249                         else if (command == "REMSTATUS")
1250                         {
1251                                 return this->RemoveStatus(prefix,params);
1252                         }
1253                         else if (command == "PING")
1254                         {
1255                                 if (prefix.empty())
1256                                         prefix = this->GetName();
1257                                 /*
1258                                  * We just got a ping from a server that's bursting.
1259                                  * This can't be right, so set them to not bursting, and
1260                                  * apply their lines.
1261                                  */
1262                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1263                                 if (ServerSource)
1264                                         Utils->SetRemoteBursting(ServerSource, false);
1265
1266                                 if (this->bursting)
1267                                 {
1268                                         this->bursting = false;
1269                                         Instance->XLines->apply_lines(Utils->lines_to_apply);
1270                                         Utils->lines_to_apply = 0;
1271                                 }
1272
1273                                 return this->LocalPing(prefix,params);
1274                         }
1275                         else if (command == "PONG")
1276                         {
1277                                 if (prefix.empty())
1278                                         prefix = this->GetName();
1279                                 /*
1280                                  * We just got a pong from a server that's bursting.
1281                                  * This can't be right, so set them to not bursting, and
1282                                  * apply their lines.
1283                                  */
1284                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1285                                 if (ServerSource)
1286                                         Utils->SetRemoteBursting(ServerSource, false);
1287
1288                                 if (this->bursting)
1289                                 {
1290                                         this->bursting = false;
1291                                         Instance->XLines->apply_lines(Utils->lines_to_apply);
1292                                         Utils->lines_to_apply = 0;
1293                                 }
1294
1295                                 return this->LocalPong(prefix,params);
1296                         }
1297                         else if (command == "VERSION")
1298                         {
1299                                 return this->ServerVersion(prefix,params);
1300                         }
1301                         else if (command == "FHOST")
1302                         {
1303                                 return this->ChangeHost(prefix,params);
1304                         }
1305                         else if (command == "FNAME")
1306                         {
1307                                 return this->ChangeName(prefix,params);
1308                         }
1309                         else if (command == "ADDLINE")
1310                         {
1311                                 TreeServer* ServerSource = Utils->FindServer(prefix);
1312                                 if (ServerSource)
1313                                         Utils->SetRemoteBursting(ServerSource, false);
1314                                 return this->AddLine(prefix,params);
1315                         }
1316                         else if (command == "SVSNICK")
1317                         {
1318                                 if (prefix.empty())
1319                                 {
1320                                         prefix = this->GetName();
1321                                 }
1322                                 return this->ForceNick(prefix,params);
1323                         }
1324                         else if (command == "OPERQUIT")
1325                         {
1326                                 return this->OperQuit(prefix,params);
1327                         }
1328                         else if (command == "IDLE")
1329                         {
1330                                 return this->Whois(prefix,params);
1331                         }
1332                         else if (command == "PUSH")
1333                         {
1334                                 return this->Push(prefix,params);
1335                         }
1336                         else if (command == "TIMESET")
1337                         {
1338                                 return this->HandleSetTime(prefix, params);
1339                         }
1340                         else if (command == "TIME")
1341                         {
1342                                 return this->Time(prefix,params);
1343                         }
1344                         else if ((command == "KICK") && (Utils->IsServer(prefix)))
1345                         {
1346                                 std::string sourceserv = this->myhost;
1347                                 if (params.size() == 3)
1348                                 {
1349                                         userrec* user = this->Instance->FindNick(params[1]);
1350                                         chanrec* chan = this->Instance->FindChan(params[0]);
1351                                         if (user && chan)
1352                                         {
1353                                                 if (!chan->ServerKickUser(user, params[2].c_str(), false))
1354                                                         /* Yikes, the channels gone! */
1355                                                         delete chan;
1356                                         }
1357                                 }
1358                                 if (!this->InboundServerName.empty())
1359                                 {
1360                                         sourceserv = this->InboundServerName;
1361                                 }
1362                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1363                         }
1364                         else if (command == "SVSJOIN")
1365                         {
1366                                 if (prefix.empty())
1367                                 {
1368                                         prefix = this->GetName();
1369                                 }
1370                                 return this->ServiceJoin(prefix,params);
1371                         }
1372                         else if (command == "SQUIT")
1373                         {
1374                                 if (params.size() == 2)
1375                                 {
1376                                         this->Squit(Utils->FindServer(params[0]),params[1]);
1377                                 }
1378                                 return true;
1379                         }
1380                         else if (command == "OPERNOTICE")
1381                         {
1382                                 std::string sourceserv = this->myhost;
1383                                 if (!this->InboundServerName.empty())
1384                                         sourceserv = this->InboundServerName;
1385                                 if (params.size() >= 1)
1386                                         Instance->WriteOpers("*** From " + sourceserv + ": " + params[0]);
1387                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1388                         }
1389                         else if (command == "MODENOTICE")
1390                         {
1391                                 std::string sourceserv = this->myhost;
1392                                 if (!this->InboundServerName.empty())
1393                                         sourceserv = this->InboundServerName;
1394                                 if (params.size() >= 2)
1395                                 {
1396                                         Instance->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", sourceserv.c_str(), params[1].c_str());
1397                                 }
1398                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1399                         }
1400                         else if (command == "SNONOTICE")
1401                         {
1402                                 std::string sourceserv = this->myhost;
1403                                 if (!this->InboundServerName.empty())
1404                                         sourceserv = this->InboundServerName;
1405                                 if (params.size() >= 2)
1406                                 {
1407                                         Instance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + sourceserv + ": "+ params[1]);
1408                                 }
1409                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
1410                         }
1411                         else if (command == "ENDBURST")
1412                         {
1413                                 this->bursting = false;
1414                                 Instance->XLines->apply_lines(Utils->lines_to_apply);
1415                                 Utils->lines_to_apply = 0;
1416                                 std::string sourceserv = this->myhost;
1417                                 if (!this->InboundServerName.empty())
1418                                         sourceserv = this->InboundServerName;
1419                                 this->Instance->SNO->WriteToSnoMask('l',"Received end of netburst from \2%s\2",sourceserv.c_str());
1420
1421                                 Event rmode((char*)sourceserv.c_str(), (Module*)Utils->Creator, "new_server");
1422                                 rmode.Send(Instance);
1423
1424                                 return true;
1425                         }
1426                         else
1427                         {
1428                                 /*
1429                                  * Not a special s2s command. Emulate the user doing it.
1430                                  * This saves us having a huge ugly command parser again.
1431                                  */
1432                                 userrec *who = this->Instance->FindUUID(prefix);
1433
1434                                 std::string sourceserv = this->myhost;
1435                                 if (!this->InboundServerName.empty())
1436                                 {
1437                                         sourceserv = this->InboundServerName;
1438                                 }
1439                                 if ((!who) && (command == "MODE"))
1440                                 {
1441                                         if (Utils->IsServer(prefix))
1442                                         {
1443                                                 const char* modelist[MAXPARAMETERS];
1444                                                 for (size_t i = 0; i < params.size(); i++)
1445                                                         modelist[i] = params[i].c_str();
1446                                                 userrec* fake = new userrec(Instance);
1447                                                 fake->SetFd(FD_MAGIC_NUMBER);
1448                                                 this->Instance->SendMode(modelist, params.size(), fake);
1449
1450                                                 delete fake;
1451                                                 /* Hot potato! pass it on! */
1452                                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1453                                         }
1454                                 }
1455                                 if (who)
1456                                 {
1457                                         if ((command == "NICK") && (params.size() > 0))
1458                                         {
1459                                                 /* On nick messages, check that the nick doesnt
1460                                                  * already exist here. If it does, kill their copy,
1461                                                  * and our copy.
1462                                                  */
1463                                                 userrec* x = this->Instance->FindNick(params[0]);
1464                                                 if ((x) && (x != who))
1465                                                 {
1466                                                         std::deque<std::string> p;
1467                                                         p.push_back(params[0]);
1468                                                         p.push_back(":Nickname collision ("+prefix+" -> "+params[0]+")");
1469                                                         Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
1470                                                         p.clear();
1471                                                         p.push_back(prefix);
1472                                                         p.push_back(":Nickname collision");
1473                                                         Utils->DoOneToMany(this->Instance->Config->ServerName,"KILL",p);
1474                                                         userrec::QuitUser(this->Instance,x,"Nickname collision ("+prefix+" -> "+params[0]+")");
1475                                                         userrec* y = this->Instance->FindNick(prefix);
1476                                                         if (y)
1477                                                         {
1478                                                                 userrec::QuitUser(this->Instance,y,"Nickname collision");
1479                                                         }
1480                                                         return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1481                                                 }
1482                                         }
1483                                         // its a user
1484                                         target = who->server;
1485                                         const char* strparams[127];
1486                                         for (unsigned int q = 0; q < params.size(); q++)
1487                                         {
1488                                                 strparams[q] = params[q].c_str();
1489                                         }
1490                                         switch (this->Instance->CallCommandHandler(command.c_str(), strparams, params.size(), who))
1491                                         {
1492                                                 case CMD_INVALID:
1493                                                         this->SendError("Unrecognised command '"+std::string(command.c_str())+"' -- possibly loaded mismatched modules");
1494                                                         return false;
1495                                                 break;
1496                                                 case CMD_FAILURE:
1497                                                         return true;
1498                                                 break;
1499                                                 default:
1500                                                         /* CMD_SUCCESS and CMD_USER_DELETED fall through here */
1501                                                 break;
1502                                         }
1503                                 }
1504                                 else
1505                                 {
1506                                         // its not a user. Its either a server, or somethings screwed up.
1507                                         if (Utils->IsServer(prefix))
1508                                                 target = this->Instance->Config->ServerName;
1509                                         else
1510                                                 return true;
1511                                 }
1512                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
1513
1514                         }
1515                         return true;
1516                 break;
1517         }
1518         return true;
1519 }
1520
1521 std::string TreeSocket::GetName()
1522 {
1523         std::string sourceserv = this->myhost;
1524         if (!this->InboundServerName.empty())
1525         {
1526                 sourceserv = this->InboundServerName;
1527         }
1528         return sourceserv;
1529 }
1530
1531 void TreeSocket::OnTimeout()
1532 {
1533         if (this->LinkState == CONNECTING)
1534         {
1535                 Utils->Creator->RemoteMessage(NULL, "CONNECT: Connection to \002%s\002 timed out.", myhost.c_str());
1536                 Link* MyLink = Utils->FindLink(myhost);
1537                 if (MyLink)
1538                         Utils->DoFailOver(MyLink);
1539         }
1540 }
1541
1542 void TreeSocket::OnClose()
1543 {
1544         if (this->LinkState == LISTENER)
1545                 return;
1546
1547         // Connection closed.
1548         // If the connection is fully up (state CONNECTED)
1549         // then propogate a netsplit to all peers.
1550         std::string quitserver = this->myhost;
1551         if (!this->InboundServerName.empty())
1552         {
1553                 quitserver = this->InboundServerName;
1554         }
1555         TreeServer* s = Utils->FindServer(quitserver);
1556         if (s)
1557         {
1558                 Squit(s,"Remote host closed the connection");
1559         }
1560
1561         if (!quitserver.empty())
1562         {
1563                 Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' failed.",quitserver.c_str());
1564                 time_t server_uptime = Instance->Time() - this->age;
1565                 if (server_uptime)
1566                         Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
1567         }
1568 }
1569
1570 int TreeSocket::OnIncomingConnection(int newsock, char* ip)
1571 {
1572         /* To prevent anyone from attempting to flood opers/DDoS by connecting to the server port,
1573          * or discovering if this port is the server port, we don't allow connections from any
1574          * IPs for which we don't have a link block.
1575          */
1576         bool found = false;
1577
1578         found = (std::find(Utils->ValidIPs.begin(), Utils->ValidIPs.end(), ip) != Utils->ValidIPs.end());
1579         if (!found)
1580         {
1581                 for (vector<std::string>::iterator i = Utils->ValidIPs.begin(); i != Utils->ValidIPs.end(); i++)
1582                         if (irc::sockets::MatchCIDR(ip, (*i).c_str()))
1583                                 found = true;
1584
1585                 if (!found)
1586                 {
1587                         Utils->Creator->RemoteMessage(NULL,"Server connection from %s denied (no link blocks with that IP address)", ip);
1588                         close(newsock);
1589                         return false;
1590                 }
1591         }
1592
1593         TreeSocket* s = new TreeSocket(this->Utils, this->Instance, newsock, ip, this->Hook);
1594         s = s; /* Whinge whinge whinge, thats all GCC ever does. */
1595         return true;
1596 }