/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd: (C) 2002-2008 InspIRCd Development Team * See: http://www.inspircd.org/wiki/index.php/Credits * * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ #include "inspircd.h" #include "xline.h" #include "m_spanningtree/treesocket.h" #include "m_spanningtree/treeserver.h" #include "m_spanningtree/utils.h" /* $ModDep: m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h */ /** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */ bool TreeSocket::ForceJoin(const std::string &source, std::deque ¶ms) { /* 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. :-) * * NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN, * FJOIN does not contain the simple-modes such as +iklmnsp. Why not, * you ask? Well, quite simply because we don't need to. They'll be sent * after the FJOIN by FMODE, and FMODE is timestamped, so in the event * the losing side sends any modes for the channel which shouldnt win, * they wont as their timestamp will be too high :-) */ if (params.size() < 3) return true; irc::modestacker modestack(ServerInstance, 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 = this->ServerInstance->FindChan(channel); /* The channel we're sending joins to */ time_t ourTS = chan ? chan->age : ServerInstance->Time()+600; /* The TS of our side of the link */ bool created = !chan; /* True if the channel doesnt exist here yet */ std::string item; /* One item in the list of nicks */ if (params.size() > 3) params[params.size() - 1] = ":" + params[params.size() - 1]; Utils->DoOneToAllButSender(source,"FJOIN",params,source); 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.", source.c_str()); return true; } if (created) chan = new Channel(ServerInstance, channel, ourTS); /* If our TS is less than theirs, we dont accept their modes */ if (ourTS < TS) apply_other_sides_modes = false; /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */ if (ourTS > TS) { std::deque param_list; if (Utils->AnnounceTSChange && chan) chan->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name.c_str(), chan->name.c_str(), (unsigned long) ourTS, (unsigned long) TS); ourTS = TS; if (!created) { chan->age = TS; param_list.push_back(channel); this->RemoveStatus(ServerInstance->Config->GetSID(), param_list); } } /* First up, apply their modes if they won the TS war */ if (apply_other_sides_modes) { unsigned int idx = 2; std::vector modelist; // Mode parser needs to know what channel to act on. modelist.push_back(params[0]); /* Remember, params[params.size() - 1] is nicklist, and we don't want to apply *that* */ for (idx = 2; idx != (params.size() - 1); idx++) { modelist.push_back(params[idx]); } this->ServerInstance->SendMode(modelist, this->ServerInstance->FakeClient); } /* 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) modes += *unparsedmodes; else { this->SendError(std::string("Unknown status mode '")+(*unparsedmodes)+"' in FJOIN"); return false; } usr++; unparsedmodes++; } /* Advance past the comma, to the nick */ usr++; /* Check the user actually exists */ who = this->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() != this)) 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(this->ServerInstance, who, channel.c_str(), true, "", true, 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) { std::deque stackresult; std::vector mode_junk; mode_junk.push_back(channel); while (modestack.GetStackedLine(stackresult)) { for (size_t j = 0; j < stackresult.size(); j++) { mode_junk.push_back(stackresult[j]); } ServerInstance->SendMode(mode_junk, ServerInstance->FakeClient); } } return true; } /** TODO: This creates a total mess of output and needs to really use irc::modestacker. */ bool TreeSocket::RemoveStatus(const std::string &prefix, std::deque ¶ms) { if (params.size() < 1) return true; Channel* c = ServerInstance->FindChan(params[0]); if (c) { irc::modestacker stack(ServerInstance, false); std::deque stackresult; std::vector mode_junk; mode_junk.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)) { for (size_t j = 0; j < stackresult.size(); j++) mode_junk.push_back(stackresult[j]); ServerInstance->SendMode(mode_junk, ServerInstance->FakeClient); } } return true; }