/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2009-2010 Daniel De Graaf * Copyright (C) 2008 Robin Burchell * Copyright (C) 2008 Dennis Friis * Copyright (C) 2008 Craig Edwards * * This file is part of InspIRCd. InspIRCd is free software: you can * redistribute it and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "inspircd.h" #include "commands.h" #include "treeserver.h" #include "treesocket.h" /** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */ CmdResult CommandFJoin::Handle(const std::vector& params, User *srcuser) { SpanningTreeUtilities* Utils = ((ModuleSpanningTree*)(Module*)creator)->Utils; /* 1.1 FJOIN works as follows: * * Each FJOIN is sent along with a timestamp, and the side with the lowest * timestamp 'wins'. From this point on we will refer to this side as the * winner. The side with the higher timestamp loses, from this point on we * will call this side the loser or losing side. This should be familiar to * anyone who's dealt with dreamforge or TS6 before. * * When two sides of a split heal and this occurs, the following things * will happen: * * If the timestamps are exactly equal, both sides merge their privilages * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been * re-created during a split, this is safe to do. * * If the timestamps are NOT equal, the losing side removes all of its * modes from the channel, before introducing new users into the channel * which are listed in the FJOIN command's parameters. The losing side then * LOWERS its timestamp value of the channel to match that of the winning * side, and the modes of the users of the winning side are merged in with * the losing side. * * The winning side on the other hand will ignore all user modes from the * losing side, so only its own modes get applied. Life is simple for those * who succeed at internets. :-) */ irc::modestacker modestack(true); /* Modes to apply from the users in the user list */ User* who = NULL; /* User we are currently checking */ std::string channel = params[0]; /* Channel name, as a string */ time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */ irc::tokenstream users((params.size() > 3) ? params[params.size() - 1] : ""); /* users from the user list */ bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */ Channel* chan = ServerInstance->FindChan(channel); /* The channel we're sending joins to */ bool created = !chan; /* True if the channel doesnt exist here yet */ std::string item; /* One item in the list of nicks */ TreeServer* src_server = Utils->FindServer(srcuser->server); TreeSocket* src_socket = src_server->GetRoute()->GetSocket(); if (!TS) { ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"*** BUG? *** TS of 0 sent to FJOIN. Are some services authors smoking craq, or is it 1970 again?. Dropped."); ServerInstance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FJOIN with a TS of zero. Total craq. Command was dropped.", srcuser->server.c_str()); return CMD_INVALID; } if (created) { chan = new Channel(channel, TS); ServerInstance->SNO->WriteToSnoMask('d', "Creation FJOIN received for %s, timestamp: %lu", chan->name.c_str(), (unsigned long)TS); } else { time_t ourTS = chan->age; if (TS != ourTS) ServerInstance->SNO->WriteToSnoMask('d', "Merge FJOIN received for %s, ourTS: %lu, TS: %lu, difference: %ld", chan->name.c_str(), (unsigned long)ourTS, (unsigned long)TS, (long)(ourTS - TS)); /* If our TS is less than theirs, we dont accept their modes */ if (ourTS < TS) { ServerInstance->SNO->WriteToSnoMask('d', "NOT Applying modes from other side"); apply_other_sides_modes = false; } else if (ourTS > TS) { /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */ ServerInstance->SNO->WriteToSnoMask('d', "Removing our modes, accepting remote"); parameterlist param_list; if (Utils->AnnounceTSChange) chan->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name.c_str(), channel.c_str(), (unsigned long) ourTS, (unsigned long) TS); // while the name is equal in case-insensitive compare, it might differ in case; use the remote version chan->name = channel; chan->age = TS; chan->ClearInvites(); param_list.push_back(channel); this->RemoveStatus(ServerInstance->FakeClient, param_list); // XXX: If the channel does not exist in the chan hash at this point, create it so the remote modes can be applied on it. // This happens to 0-user permanent channels on the losing side, because those are removed (from the chan hash, then // deleted later) as soon as the permchan mode is removed from them. if (ServerInstance->FindChan(channel) == NULL) { chan = new Channel(channel, TS); } } // The silent case here is ourTS == TS, we don't need to remove modes here, just to merge them later on. } /* First up, apply their modes if they won the TS war */ if (apply_other_sides_modes) { // Need to use a modestacker here due to maxmodes irc::modestacker stack(true); std::vector::const_iterator paramit = params.begin() + 3; const std::vector::const_iterator lastparamit = ((params.size() > 3) ? (params.end() - 1) : params.end()); for (std::string::const_iterator i = params[2].begin(); i != params[2].end(); ++i) { ModeHandler* mh = ServerInstance->Modes->FindMode(*i, MODETYPE_CHANNEL); if (!mh) continue; std::string modeparam; if ((paramit != lastparamit) && (mh->GetNumParams(true))) { modeparam = *paramit; ++paramit; } stack.Push(*i, modeparam); } std::vector modelist; // Mode parser needs to know what channel to act on. modelist.push_back(params[0]); while (stack.GetStackedLine(modelist)) { ServerInstance->Modes->Process(modelist, srcuser, true); modelist.erase(modelist.begin() + 1, modelist.end()); } ServerInstance->Modes->Process(modelist, srcuser, true); } /* Now, process every 'modes,nick' pair */ while (users.GetToken(item)) { const char* usr = item.c_str(); if (usr && *usr) { const char* unparsedmodes = usr; std::string modes; /* Iterate through all modes for this user and check they are valid. */ while ((*unparsedmodes) && (*unparsedmodes != ',')) { ModeHandler *mh = ServerInstance->Modes->FindMode(*unparsedmodes, MODETYPE_CHANNEL); if (!mh) { ServerInstance->Logs->Log("m_spanningtree", SPARSE, "Unrecognised mode %c, dropping link", *unparsedmodes); return CMD_INVALID; } modes += *unparsedmodes; usr++; unparsedmodes++; } /* Advance past the comma, to the nick */ usr++; /* Check the user actually exists */ who = ServerInstance->FindUUID(usr); if (who) { /* Check that the user's 'direction' is correct */ TreeServer* route_back_again = Utils->BestRouteTo(who->server); if ((!route_back_again) || (route_back_again->GetSocket() != src_socket)) continue; /* Add any modes this user had to the mode stack */ for (std::string::iterator x = modes.begin(); x != modes.end(); ++x) modestack.Push(*x, who->nick); Channel::JoinUser(who, channel.c_str(), true, "", src_server->bursting, TS); } else { ServerInstance->Logs->Log("m_spanningtree",SPARSE, "Ignored nonexistant user %s in fjoin to %s (probably quit?)", usr, channel.c_str()); continue; } } } /* Flush mode stacker if we lost the FJOIN or had equal TS */ if (apply_other_sides_modes) { parameterlist stackresult; stackresult.push_back(channel); while (modestack.GetStackedLine(stackresult)) { ServerInstance->SendMode(stackresult, srcuser); stackresult.erase(stackresult.begin() + 1, stackresult.end()); } } return CMD_SUCCESS; } void CommandFJoin::RemoveStatus(User* srcuser, parameterlist ¶ms) { if (params.size() < 1) return; Channel* c = ServerInstance->FindChan(params[0]); if (c) { irc::modestacker stack(false); parameterlist stackresult; stackresult.push_back(c->name); for (char modeletter = 'A'; modeletter <= 'z'; ++modeletter) { ModeHandler* mh = ServerInstance->Modes->FindMode(modeletter, MODETYPE_CHANNEL); /* Passing a pointer to a modestacker here causes the mode to be put onto the mode stack, * rather than applied immediately. Module unloads require this to be done immediately, * for this function we require tidyness instead. Fixes bug #493 */ if (mh) mh->RemoveMode(c, &stack); } while (stack.GetStackedLine(stackresult)) { ServerInstance->SendMode(stackresult, srcuser); stackresult.erase(stackresult.begin() + 1, stackresult.end()); } } }