1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2010 InspIRCd Development Team
6 * See: http://wiki.inspircd.org/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
16 #include "treeserver.h"
17 #include "treesocket.h"
19 /** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */
20 CmdResult CommandFJoin::Handle(const std::vector<std::string>& params, User *srcuser)
22 SpanningTreeUtilities* Utils = ((ModuleSpanningTree*)(Module*)creator)->Utils;
23 /* 1.1 FJOIN works as follows:
25 * Each FJOIN is sent along with a timestamp, and the side with the lowest
26 * timestamp 'wins'. From this point on we will refer to this side as the
27 * winner. The side with the higher timestamp loses, from this point on we
28 * will call this side the loser or losing side. This should be familiar to
29 * anyone who's dealt with dreamforge or TS6 before.
31 * When two sides of a split heal and this occurs, the following things
34 * If the timestamps are exactly equal, both sides merge their privilages
35 * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
36 * re-created during a split, this is safe to do.
38 * If the timestamps are NOT equal, the losing side removes all of its
39 * modes from the channel, before introducing new users into the channel
40 * which are listed in the FJOIN command's parameters. The losing side then
41 * LOWERS its timestamp value of the channel to match that of the winning
42 * side, and the modes of the users of the winning side are merged in with
45 * The winning side on the other hand will ignore all user modes from the
46 * losing side, so only its own modes get applied. Life is simple for those
47 * who succeed at internets. :-)
49 if (params.size() < 3)
52 irc::modestacker modestack(true); /* Modes to apply from the users in the user list */
53 User* who = NULL; /* User we are currently checking */
54 std::string channel = params[0]; /* Channel name, as a string */
55 time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */
56 irc::tokenstream users((params.size() > 3) ? params[params.size() - 1] : ""); /* users from the user list */
57 bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */
58 Channel* chan = ServerInstance->FindChan(channel); /* The channel we're sending joins to */
59 bool created = !chan; /* True if the channel doesnt exist here yet */
60 std::string item; /* One item in the list of nicks */
62 TreeSocket* src_socket = Utils->FindServer(srcuser->server)->GetRoute()->GetSocket();
66 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.");
67 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());
73 chan = new Channel(channel, TS);
74 ServerInstance->SNO->WriteToSnoMask('d', "Creation FJOIN recieved for %s, timestamp: %lu", chan->name.c_str(), (unsigned long)TS);
78 time_t ourTS = chan->age;
81 ServerInstance->SNO->WriteToSnoMask('d', "Merge FJOIN recieved for %s, ourTS: %lu, TS: %lu, difference: %lu",
82 chan->name.c_str(), (unsigned long)ourTS, (unsigned long)TS, (unsigned long)(ourTS - TS));
83 /* If our TS is less than theirs, we dont accept their modes */
86 ServerInstance->SNO->WriteToSnoMask('d', "NOT Applying modes from other side");
87 apply_other_sides_modes = false;
91 /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
92 ServerInstance->SNO->WriteToSnoMask('d', "Removing our modes, accepting remote");
93 parameterlist param_list;
94 if (Utils->AnnounceTSChange)
95 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);
96 // while the name is equal in case-insensitive compare, it might differ in case; use the remote version
99 param_list.push_back(channel);
100 this->RemoveStatus(ServerInstance->FakeClient, param_list);
102 // The silent case here is ourTS == TS, we don't need to remove modes here, just to merge them later on.
105 /* First up, apply their modes if they won the TS war */
106 if (apply_other_sides_modes)
108 unsigned int idx = 2;
109 std::vector<std::string> modelist;
111 // Mode parser needs to know what channel to act on.
112 modelist.push_back(params[0]);
114 /* Remember, params[params.size() - 1] is nicklist, and we don't want to apply *that* */
115 for (idx = 2; idx != (params.size() - 1); idx++)
117 modelist.push_back(params[idx]);
120 ServerInstance->SendMode(modelist, srcuser);
123 /* Now, process every 'modes,nick' pair */
124 while (users.GetToken(item))
126 const char* usr = item.c_str();
129 const char* unparsedmodes = usr;
133 /* Iterate through all modes for this user and check they are valid. */
134 while ((*unparsedmodes) && (*unparsedmodes != ','))
136 ModeHandler *mh = ServerInstance->Modes->FindMode(*unparsedmodes, MODETYPE_CHANNEL);
139 ServerInstance->Logs->Log("m_spanningtree", SPARSE, "Unrecognised mode %c, dropping link", *unparsedmodes);
143 modes += *unparsedmodes;
148 /* Advance past the comma, to the nick */
151 /* Check the user actually exists */
152 who = ServerInstance->FindUUID(usr);
155 /* Check that the user's 'direction' is correct */
156 TreeServer* route_back_again = Utils->BestRouteTo(who->server);
157 if ((!route_back_again) || (route_back_again->GetSocket() != src_socket))
160 /* Add any modes this user had to the mode stack */
161 for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
162 modestack.Push(*x, who->nick);
164 Channel::JoinUser(who, channel.c_str(), true, "", route_back_again->bursting, TS);
168 ServerInstance->Logs->Log("m_spanningtree",SPARSE, "Ignored nonexistant user %s in fjoin to %s (probably quit?)", usr, channel.c_str());
174 /* Flush mode stacker if we lost the FJOIN or had equal TS */
175 if (apply_other_sides_modes)
177 parameterlist stackresult;
178 stackresult.push_back(channel);
180 while (modestack.GetStackedLine(stackresult))
182 ServerInstance->SendMode(stackresult, srcuser);
183 stackresult.erase(stackresult.begin() + 1, stackresult.end());
189 void CommandFJoin::RemoveStatus(User* srcuser, parameterlist ¶ms)
191 if (params.size() < 1)
194 Channel* c = ServerInstance->FindChan(params[0]);
198 irc::modestacker stack(false);
199 parameterlist stackresult;
200 stackresult.push_back(c->name);
202 for (char modeletter = 'A'; modeletter <= 'z'; ++modeletter)
204 ModeHandler* mh = ServerInstance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
206 /* Passing a pointer to a modestacker here causes the mode to be put onto the mode stack,
207 * rather than applied immediately. Module unloads require this to be done immediately,
208 * for this function we require tidyness instead. Fixes bug #493
211 mh->RemoveMode(c, &stack);
214 while (stack.GetStackedLine(stackresult))
216 ServerInstance->SendMode(stackresult, srcuser);
217 stackresult.erase(stackresult.begin() + 1, stackresult.end());