2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
6 * Copyright (C) 2008 Dennis Friis <peavey@inspircd.org>
7 * Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
9 * This file is part of InspIRCd. InspIRCd is free software: you can
10 * redistribute it and/or modify it under the terms of the GNU General Public
11 * License as published by the Free Software Foundation, version 2.
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "treeserver.h"
26 #include "treesocket.h"
28 /** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */
29 CmdResult CommandFJoin::Handle(const std::vector<std::string>& params, User *srcuser)
31 SpanningTreeUtilities* Utils = ((ModuleSpanningTree*)(Module*)creator)->Utils;
32 /* 1.1 FJOIN works as follows:
34 * Each FJOIN is sent along with a timestamp, and the side with the lowest
35 * timestamp 'wins'. From this point on we will refer to this side as the
36 * winner. The side with the higher timestamp loses, from this point on we
37 * will call this side the loser or losing side. This should be familiar to
38 * anyone who's dealt with dreamforge or TS6 before.
40 * When two sides of a split heal and this occurs, the following things
43 * If the timestamps are exactly equal, both sides merge their privilages
44 * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
45 * re-created during a split, this is safe to do.
47 * If the timestamps are NOT equal, the losing side removes all of its
48 * modes from the channel, before introducing new users into the channel
49 * which are listed in the FJOIN command's parameters. The losing side then
50 * LOWERS its timestamp value of the channel to match that of the winning
51 * side, and the modes of the users of the winning side are merged in with
54 * The winning side on the other hand will ignore all user modes from the
55 * losing side, so only its own modes get applied. Life is simple for those
56 * who succeed at internets. :-)
59 irc::modestacker modestack(true); /* Modes to apply from the users in the user list */
60 User* who = NULL; /* User we are currently checking */
61 std::string channel = params[0]; /* Channel name, as a string */
62 time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */
63 irc::tokenstream users((params.size() > 3) ? params[params.size() - 1] : ""); /* users from the user list */
64 bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */
65 Channel* chan = ServerInstance->FindChan(channel); /* The channel we're sending joins to */
66 bool created = !chan; /* True if the channel doesnt exist here yet */
67 std::string item; /* One item in the list of nicks */
69 TreeServer* src_server = Utils->FindServer(srcuser->server);
70 TreeSocket* src_socket = src_server->GetRoute()->GetSocket();
74 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.");
75 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());
81 chan = new Channel(channel, TS);
82 ServerInstance->SNO->WriteToSnoMask('d', "Creation FJOIN received for %s, timestamp: %lu", chan->name.c_str(), (unsigned long)TS);
86 time_t ourTS = chan->age;
89 ServerInstance->SNO->WriteToSnoMask('d', "Merge FJOIN received for %s, ourTS: %lu, TS: %lu, difference: %ld",
90 chan->name.c_str(), (unsigned long)ourTS, (unsigned long)TS, (long)(ourTS - TS));
91 /* If our TS is less than theirs, we dont accept their modes */
94 ServerInstance->SNO->WriteToSnoMask('d', "NOT Applying modes from other side");
95 apply_other_sides_modes = false;
99 /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
100 ServerInstance->SNO->WriteToSnoMask('d', "Removing our modes, accepting remote");
101 parameterlist param_list;
102 if (Utils->AnnounceTSChange)
103 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);
104 // while the name is equal in case-insensitive compare, it might differ in case; use the remote version
105 chan->name = channel;
107 chan->ClearInvites();
108 param_list.push_back(channel);
109 this->RemoveStatus(ServerInstance->FakeClient, param_list);
111 // 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.
112 // This happens to 0-user permanent channels on the losing side, because those are removed (from the chan hash, then
113 // deleted later) as soon as the permchan mode is removed from them.
114 if (ServerInstance->FindChan(channel) == NULL)
116 chan = new Channel(channel, TS);
119 // The silent case here is ourTS == TS, we don't need to remove modes here, just to merge them later on.
122 /* First up, apply their modes if they won the TS war */
123 if (apply_other_sides_modes)
125 // Need to use a modestacker here due to maxmodes
126 irc::modestacker stack(true);
127 std::vector<std::string>::const_iterator paramit = params.begin() + 3;
128 const std::vector<std::string>::const_iterator lastparamit = ((params.size() > 3) ? (params.end() - 1) : params.end());
129 for (std::string::const_iterator i = params[2].begin(); i != params[2].end(); ++i)
131 ModeHandler* mh = ServerInstance->Modes->FindMode(*i, MODETYPE_CHANNEL);
135 std::string modeparam;
136 if ((paramit != lastparamit) && (mh->GetNumParams(true)))
138 modeparam = *paramit;
142 stack.Push(*i, modeparam);
145 std::vector<std::string> modelist;
147 // Mode parser needs to know what channel to act on.
148 modelist.push_back(params[0]);
150 while (stack.GetStackedLine(modelist))
152 ServerInstance->Modes->Process(modelist, srcuser, true);
153 modelist.erase(modelist.begin() + 1, modelist.end());
156 ServerInstance->Modes->Process(modelist, srcuser, true);
159 /* Now, process every 'modes,nick' pair */
160 while (users.GetToken(item))
162 const char* usr = item.c_str();
165 const char* unparsedmodes = usr;
169 /* Iterate through all modes for this user and check they are valid. */
170 while ((*unparsedmodes) && (*unparsedmodes != ','))
172 ModeHandler *mh = ServerInstance->Modes->FindMode(*unparsedmodes, MODETYPE_CHANNEL);
175 ServerInstance->Logs->Log("m_spanningtree", SPARSE, "Unrecognised mode %c, dropping link", *unparsedmodes);
179 modes += *unparsedmodes;
184 /* Advance past the comma, to the nick */
187 /* Check the user actually exists */
188 who = ServerInstance->FindUUID(usr);
191 /* Check that the user's 'direction' is correct */
192 TreeServer* route_back_again = Utils->BestRouteTo(who->server);
193 if ((!route_back_again) || (route_back_again->GetSocket() != src_socket))
196 /* Add any modes this user had to the mode stack */
197 for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
198 modestack.Push(*x, who->nick);
200 Channel::JoinUser(who, channel.c_str(), true, "", src_server->bursting, TS);
204 ServerInstance->Logs->Log("m_spanningtree",SPARSE, "Ignored nonexistant user %s in fjoin to %s (probably quit?)", usr, channel.c_str());
210 /* Flush mode stacker if we lost the FJOIN or had equal TS */
211 if (apply_other_sides_modes)
213 parameterlist stackresult;
214 stackresult.push_back(channel);
216 while (modestack.GetStackedLine(stackresult))
218 ServerInstance->SendMode(stackresult, srcuser);
219 stackresult.erase(stackresult.begin() + 1, stackresult.end());
225 void CommandFJoin::RemoveStatus(User* srcuser, parameterlist ¶ms)
227 if (params.size() < 1)
230 Channel* c = ServerInstance->FindChan(params[0]);
234 irc::modestacker stack(false);
235 parameterlist stackresult;
236 stackresult.push_back(c->name);
238 for (char modeletter = 'A'; modeletter <= 'z'; ++modeletter)
240 ModeHandler* mh = ServerInstance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
242 /* Passing a pointer to a modestacker here causes the mode to be put onto the mode stack,
243 * rather than applied immediately. Module unloads require this to be done immediately,
244 * for this function we require tidyness instead. Fixes bug #493
247 mh->RemoveMode(c, &stack);
250 while (stack.GetStackedLine(stackresult))
252 ServerInstance->SendMode(stackresult, srcuser);
253 stackresult.erase(stackresult.begin() + 1, stackresult.end());