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, similar to TS6 SJOIN, but not quite. */
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 :-)
61 if (params.size() < 2)
64 irc::modestacker modestack(true); /* Modes to apply from the users in the user list */
65 User* who = NULL; /* User we are currently checking */
66 std::string channel = params[0]; /* Channel name, as a string */
67 time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */
68 irc::tokenstream users((params.size() > 2) ? params[2] : ""); /* users from the user list */
69 bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */
70 Channel* chan = this->Instance->FindChan(channel); /* The channel we're sending joins to */
71 time_t ourTS = chan ? chan->age : Instance->Time()+600; /* The TS of our side of the link */
72 bool created = !chan; /* True if the channel doesnt exist here yet */
73 std::string item; /* One item in the list of nicks */
75 if (params.size() > 2)
76 params[2] = ":" + params[2];
78 Utils->DoOneToAllButSender(source,"FJOIN",params,source);
82 Instance->Logs->Log("m_spanningtree",DEFAULT,"*** BUG? *** TS of 0 sent to FJOIN. Are some services authors smoking craq, or is it 1970 again?. Dropped.");
83 Instance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FJOIN with a TS of zero. Total craq. Command was dropped.", source.c_str());
88 chan = new Channel(Instance, channel, ourTS);
90 /* If our TS is less than theirs, we dont accept their modes */
92 apply_other_sides_modes = false;
94 /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
97 std::deque<std::string> param_list;
98 if (Utils->AnnounceTSChange && chan)
99 chan->WriteChannelWithServ(Instance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name, chan->name, ourTS, TS);
104 param_list.push_back(channel);
105 this->RemoveStatus(Instance->Config->GetSID(), param_list);
109 /* Now, process every 'prefixes,nick' pair */
110 while (users.GetToken(item))
112 const char* usr = item.c_str();
115 const char* permissions = usr;
116 /* Iterate through all the prefix values, convert them from prefixes to mode letters */
118 while ((*permissions) && (*permissions != ','))
120 ModeHandler* mh = Instance->Modes->FindPrefix(*permissions);
122 modes = modes + mh->GetModeChar();
125 this->SendError(std::string("Invalid prefix '")+(*permissions)+"' in FJOIN");
131 /* Advance past the comma, to the nick */
134 /* Check the user actually exists */
135 who = this->Instance->FindUUID(usr);
138 /* Check that the user's 'direction' is correct */
139 TreeServer* route_back_again = Utils->BestRouteTo(who->server);
140 if ((!route_back_again) || (route_back_again->GetSocket() != this))
143 /* Add any permissions this user had to the mode stack */
144 for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
145 modestack.Push(*x, who->nick);
147 Channel::JoinUser(this->Instance, who, channel.c_str(), true, "", true, TS);
151 Instance->Logs->Log("m_spanningtree",SPARSE,"Warning! Invalid user %s in FJOIN to channel %s IGNORED", usr, channel.c_str());
157 /* Flush mode stacker if we lost the FJOIN or had equal TS */
158 if (apply_other_sides_modes)
160 std::deque<std::string> stackresult;
161 const char* mode_junk[MAXMODES+2];
162 mode_junk[0] = channel.c_str();
164 while (modestack.GetStackedLine(stackresult))
166 for (size_t j = 0; j < stackresult.size(); j++)
168 mode_junk[j+1] = stackresult[j].c_str();
170 Instance->SendMode(mode_junk, stackresult.size() + 1, Instance->FakeClient);
177 /** TODO: This creates a total mess of output and needs to really use irc::modestacker.
179 bool TreeSocket::RemoveStatus(const std::string &prefix, std::deque<std::string> ¶ms)
181 if (params.size() < 1)
184 Channel* c = Instance->FindChan(params[0]);
188 for (char modeletter = 'A'; modeletter <= 'z'; modeletter++)
190 ModeHandler* mh = Instance->Modes->FindMode(modeletter, MODETYPE_CHANNEL);