1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2008 InspIRCd Development Team
6 * See: http://www.inspircd.org/wiki/index.php/Credits
8 * This program is free but copyrighted software; see
9 * the file COPYING for details.
11 * ---------------------------------------------------
17 #include "m_spanningtree/treesocket.h"
18 #include "m_spanningtree/treeserver.h"
19 #include "m_spanningtree/utils.h"
21 /* $ModDep: m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h */
24 /** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */
25 bool TreeSocket::ForceJoin(const std::string &source, std::deque<std::string> ¶ms)
27 /* 1.1 FJOIN works as follows:
29 * Each FJOIN is sent along with a timestamp, and the side with the lowest
30 * timestamp 'wins'. From this point on we will refer to this side as the
31 * winner. The side with the higher timestamp loses, from this point on we
32 * will call this side the loser or losing side. This should be familiar to
33 * anyone who's dealt with dreamforge or TS6 before.
35 * When two sides of a split heal and this occurs, the following things
38 * If the timestamps are exactly equal, both sides merge their privilages
39 * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
40 * re-created during a split, this is safe to do.
42 * If the timestamps are NOT equal, the losing side removes all of its
43 * modes from the channel, before introducing new users into the channel
44 * which are listed in the FJOIN command's parameters. The losing side then
45 * LOWERS its timestamp value of the channel to match that of the winning
46 * side, and the modes of the users of the winning side are merged in with
49 * The winning side on the other hand will ignore all user modes from the
50 * losing side, so only its own modes get applied. Life is simple for those
51 * who succeed at internets. :-)
53 * NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN,
54 * FJOIN does not contain the simple-modes such as +iklmnsp. Why not,
55 * you ask? Well, quite simply because we don't need to. They'll be sent
56 * after the FJOIN by FMODE, and FMODE is timestamped, so in the event
57 * the losing side sends any modes for the channel which shouldnt win,
58 * they wont as their timestamp will be too high :-)
60 if (params.size() < 3)
63 irc::modestacker modestack(ServerInstance, true); /* Modes to apply from the users in the user list */
64 User* who = NULL; /* User we are currently checking */
65 std::string channel = params[0]; /* Channel name, as a string */
66 time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */
67 irc::tokenstream users((params.size() > 3) ? params[params.size() - 1] : ""); /* users from the user list */
68 bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */
69 Channel* chan = this->ServerInstance->FindChan(channel); /* The channel we're sending joins to */
70 time_t ourTS = chan ? chan->age : ServerInstance->Time()+600; /* The TS of our side of the link */
71 bool created = !chan; /* True if the channel doesnt exist here yet */
72 std::string item; /* One item in the list of nicks */
74 if (params.size() > 3)
75 params[params.size() - 1] = ":" + params[params.size() - 1];
77 Utils->DoOneToAllButSender(source,"FJOIN",params,source);
81 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.");
82 ServerInstance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FJOIN with a TS of zero. Total craq. Command was dropped.", source.c_str());
87 chan = new Channel(ServerInstance, channel, ourTS);
89 /* If our TS is less than theirs, we dont accept their modes */
91 apply_other_sides_modes = false;
93 /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
96 std::deque<std::string> param_list;
97 if (Utils->AnnounceTSChange && chan)
98 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);
103 param_list.push_back(channel);
104 this->RemoveStatus(ServerInstance->Config->GetSID(), param_list);
108 /* First up, apply their modes if they won the TS war */
109 if (apply_other_sides_modes)
111 unsigned int idx = 2;
112 std::vector<std::string> modelist;
114 // Mode parser needs to know what channel to act on.
115 modelist.push_back(params[0]);
117 /* Remember, params[params.size() - 1] is nicklist, and we don't want to apply *that* */
118 for (idx = 2; idx != (params.size() - 1); idx++)
120 modelist.push_back(params[idx]);
123 this->ServerInstance->SendMode(modelist, this->ServerInstance->FakeClient);
126 /* Now, process every 'modes,nick' pair */
127 while (users.GetToken(item))
129 const char* usr = item.c_str();
132 const char* unparsedmodes = usr;
136 /* Iterate through all modes for this user and check they are valid. */
137 while ((*unparsedmodes) && (*unparsedmodes != ','))
139 ModeHandler *mh = ServerInstance->Modes->FindMode(*unparsedmodes, MODETYPE_CHANNEL);
141 modes += *unparsedmodes;
144 this->SendError(std::string("Unknown status mode '")+(*unparsedmodes)+"' in FJOIN");
152 /* Advance past the comma, to the nick */
155 /* Check the user actually exists */
156 who = this->ServerInstance->FindUUID(usr);
159 /* Check that the user's 'direction' is correct */
160 TreeServer* route_back_again = Utils->BestRouteTo(who->server);
161 if ((!route_back_again) || (route_back_again->GetSocket() != this))
164 /* Add any modes this user had to the mode stack */
165 for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
166 modestack.Push(*x, who->nick);
168 Channel::JoinUser(this->ServerInstance, who, channel.c_str(), true, "", true, TS);
172 ServerInstance->Logs->Log("m_spanningtree",SPARSE, "Ignored nonexistant user %s in fjoin to %s (probably quit?)", usr, channel.c_str());
178 /* Flush mode stacker if we lost the FJOIN or had equal TS */
179 if (apply_other_sides_modes)
181 std::deque<std::string> stackresult;
182 std::vector<std::string> mode_junk;
183 mode_junk.push_back(channel);
185 while (modestack.GetStackedLine(stackresult))
187 for (size_t j = 0; j < stackresult.size(); j++)
189 mode_junk.push_back(stackresult[j]);
191 ServerInstance->SendMode(mode_junk, ServerInstance->FakeClient);
198 /** TODO: This creates a total mess of output and needs to really use irc::modestacker.
200 bool TreeSocket::RemoveStatus(const std::string &prefix, std::deque<std::string> ¶ms)
202 if (params.size() < 1)
205 Channel* c = ServerInstance->FindChan(params[0]);
209 irc::modestacker stack(ServerInstance, false);
210 std::deque<std::string> stackresult;
211 std::vector<std::string> mode_junk;
212 mode_junk.push_back(c->name);
214 for (char modeletter = 'A'; modeletter <= 'z'; ++modeletter)
216 ModeHandler* mh = ServerInstance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);
218 /* Passing a pointer to a modestacker here causes the mode to be put onto the mode stack,
219 * rather than applied immediately. Module unloads require this to be done immediately,
220 * for this function we require tidyness instead. Fixes bug #493
223 mh->RemoveMode(c, &stack);
226 while (stack.GetStackedLine(stackresult))
228 for (size_t j = 0; j < stackresult.size(); j++)
229 mode_junk.push_back(stackresult[j]);
231 ServerInstance->SendMode(mode_junk, ServerInstance->FakeClient);