2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2007-2008, 2012 Robin Burchell <robin+git@viroteck.net>
5 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
6 * Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
7 * Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
8 * Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
9 * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
11 * This file is part of InspIRCd. InspIRCd is free software: you can
12 * redistribute it and/or modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation, version 2.
15 * This program is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
20 * You should have received a copy of the GNU General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
29 #include "treeserver.h"
30 #include "treesocket.h"
31 #include "resolvers.h"
33 /* Handle ERROR command */
34 void TreeSocket::Error(parameterlist ¶ms)
36 std::string msg = params.size() ? params[0] : "";
37 SetError("received ERROR " + msg);
40 void TreeSocket::Split(const std::string& line, std::string& prefix, std::string& command, parameterlist& params)
42 irc::tokenstream tokens(line);
44 if (!tokens.GetToken(prefix))
49 prefix = prefix.substr(1);
53 this->SendError("BUG (?) Empty prefix received: " + line);
56 if (!tokens.GetToken(command))
58 this->SendError("BUG (?) Empty command received: " + line);
68 this->SendError("BUG (?) Empty command received: " + line);
71 while (tokens.GetToken(param))
73 params.push_back(param);
77 void TreeSocket::ProcessLine(std::string &line)
83 ServerInstance->Logs->Log("m_spanningtree", LOG_RAWIO, "S[%d] I %s", this->GetFd(), line.c_str());
85 Split(line, prefix, command, params);
90 switch (this->LinkState)
95 * Waiting for SERVER command from remote server. Server initiating
96 * the connection sends the first SERVER command, listening server
97 * replies with theirs if its happy, then if the initiator is happy,
98 * it starts to send its net sync, which starts the merge, otherwise
101 if (command == "PASS")
104 * Ignore this silently. Some services packages insist on sending PASS, even
105 * when it is not required (i.e. by us). We have to ignore this here, otherwise
106 * as it's an unknown command (effectively), it will cause the connection to be
107 * closed, which probably isn't what people want. -- w00t
110 else if (command == "SERVER")
112 this->Inbound_Server(params);
114 else if (command == "ERROR")
118 else if (command == "USER")
120 this->SendError("Client connections to this port are prohibited.");
122 else if (command == "CAPAB")
128 this->SendError("Invalid command in negotiation phase: " + command);
134 * We have sent SERVER to the other side of the connection. Now we're waiting for them to start BURST.
135 * The other option at this stage of things, of course, is for them to close our connection thanks
136 * to invalid credentials.. -- w
138 if (command == "SERVER")
141 * Connection is either attempting to re-auth itself (stupid) or sending netburst without sending BURST.
142 * Both of these aren't allowable, so block them here. -- w
144 this->SendError("You may not re-authenticate or commence netburst without sending BURST.");
146 else if (command == "BURST")
150 time_t them = ConvToInt(params[0]);
151 time_t delta = them - ServerInstance->Time();
152 if ((delta < -600) || (delta > 600))
154 ServerInstance->SNO->WriteGlobalSno('l',"\2ERROR\2: Your clocks are out by %d seconds (this is more than five minutes). Link aborted, \2PLEASE SYNC YOUR CLOCKS!\2",abs((long)delta));
155 SendError("Your clocks are out by "+ConvToStr(abs((long)delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
158 else if ((delta < -30) || (delta > 30))
160 ServerInstance->SNO->WriteGlobalSno('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs((long)delta));
163 this->LinkState = CONNECTED;
164 Utils->timeoutlist.erase(this);
166 MyRoot->bursting = true;
167 this->DoBurst(MyRoot);
169 parameterlist sparams;
170 sparams.push_back(MyRoot->GetName());
171 sparams.push_back("*");
172 sparams.push_back("0");
173 sparams.push_back(MyRoot->GetID());
174 sparams.push_back(":" + MyRoot->GetDesc());
175 Utils->DoOneToAllButSender(ServerInstance->Config->GetSID(), "SERVER", sparams, MyRoot->GetName());
176 Utils->DoOneToAllButSender(MyRoot->GetID(), "BURST", params, MyRoot->GetName());
178 else if (command == "ERROR")
182 else if (command == "CAPAB")
191 * We're connecting (OUTGOING) to another server. They are in state WAIT_AUTH_1 until they verify
192 * our credentials, when they proceed into WAIT_AUTH_2 and send SERVER to us. We then send BURST
193 * + our netburst, which will put them into CONNECTED state. -- w
195 if (command == "SERVER")
197 // Our credentials have been accepted, send netburst. (this puts US into the CONNECTED state)
198 this->Outbound_Reply_Server(params);
200 else if (command == "ERROR")
204 else if (command == "CAPAB")
212 * Credentials have been exchanged, we've gotten their 'BURST' (or sent ours).
213 * Anything from here on should be accepted a little more reasonably.
215 this->ProcessConnectedLine(prefix, command, params);
222 void TreeSocket::ProcessConnectedLine(std::string& prefix, std::string& command, parameterlist& params)
224 User* who = ServerInstance->FindUUID(prefix);
225 std::string direction;
229 TreeServer* ServerSource = Utils->FindServer(prefix);
231 ServerSource = MyRoot;
235 who = ServerSource->ServerUser;
239 /* It is important that we don't close the link here, unknown prefix can occur
240 * due to various race conditions such as the KILL message for a user somehow
241 * crossing the users QUIT further upstream from the server. Thanks jilles!
244 if ((prefix.length() == UIDGenerator::UUID_LENGTH) && (isdigit(prefix[0])) &&
245 ((command == "FMODE") || (command == "MODE") || (command == "KICK") || (command == "TOPIC") || (command == "KILL") || (command == "ADDLINE") || (command == "DELLINE")))
247 /* Special case, we cannot drop these commands as they've been committed already on a
248 * part of the network by the time we receive them, so in this scenario pretend the
249 * command came from a server to avoid desync.
252 who = ServerInstance->FindUUID(prefix.substr(0, 3));
254 who = this->MyRoot->ServerUser;
258 ServerInstance->Logs->Log("m_spanningtree", LOG_DEBUG, "Command '%s' from unknown prefix '%s'! Dropping entire command.",
259 command.c_str(), prefix.c_str());
265 // Make sure prefix is still good
266 direction = who->server;
270 * Check for fake direction here, and drop any instances that are found.
271 * What is fake direction? Imagine the following server setup:
272 * 0AA <-> 0AB <-> 0AC
273 * Fake direction would be 0AC sending a message to 0AB claiming to be from
274 * 0AA, or something similar. Basically, a message taking a path that *cannot*
277 * When would this be seen?
278 * Well, hopefully never. It could be caused by race conditions, bugs, or
279 * "miscreant" servers, though, so let's check anyway. -- w
281 * We also check here for totally invalid prefixes (prefixes that are neither
282 * a valid SID or a valid UUID, so that invalid UUID or SID never makes it
283 * to the higher level functions. -- B
285 TreeServer* route_back_again = Utils->BestRouteTo(direction);
286 if ((!route_back_again) || (route_back_again->GetSocket() != this))
288 if (route_back_again)
289 ServerInstance->Logs->Log("m_spanningtree",LOG_DEBUG,"Protocol violation: Fake direction '%s' from connection '%s'",
290 prefix.c_str(),linkID.c_str());
295 * First up, check for any malformed commands (e.g. MODE without a timestamp)
296 * and rewrite commands where necessary (SVSMODE -> MODE for services). -- w
298 if (command == "SVSMODE") // This isn't in an "else if" so we still force FMODE for changes on channels.
301 if (proto_version < ProtocolVersion)
303 if (!PreProcessOldProtocolMessage(who, command, params))
307 // TODO move all this into Commands
308 if (command == "MAP")
310 Utils->Creator->HandleMap(params, who);
312 else if (command == "SERVER")
314 this->RemoteServer(prefix,params);
316 else if (command == "ERROR")
320 else if (command == "AWAY")
322 this->Away(prefix,params);
324 else if (command == "PING")
326 this->LocalPing(prefix,params);
328 else if (command == "PONG")
330 TreeServer *s = Utils->FindServer(prefix);
331 if (s && s->bursting)
333 ServerInstance->SNO->WriteGlobalSno('l',"Server \002%s\002 has not finished burst, forcing end of burst (send ENDBURST!)", prefix.c_str());
336 this->LocalPong(prefix,params);
338 else if (command == "VERSION")
340 this->ServerVersion(prefix,params);
342 else if (command == "ADDLINE")
344 this->AddLine(prefix,params);
346 else if (command == "DELLINE")
348 this->DelLine(prefix,params);
350 else if (command == "SAVE")
352 this->ForceNick(prefix,params);
354 else if (command == "OPERQUIT")
356 this->OperQuit(prefix,params);
358 else if (command == "IDLE")
360 this->Whois(prefix,params);
362 else if (command == "PUSH")
364 this->Push(prefix,params);
366 else if (command == "SQUIT")
368 if (params.size() == 2)
370 this->Squit(Utils->FindServer(params[0]),params[1]);
373 else if (command == "SNONOTICE")
375 if (params.size() >= 2)
377 ServerInstance->SNO->WriteToSnoMask(params[0][0], "From " + who->nick + ": "+ params[1]);
378 params[1] = ":" + params[1];
379 Utils->DoOneToAllButSender(prefix, command, params, prefix);
382 else if (command == "BURST")
384 // Set prefix server as bursting
385 TreeServer* ServerSource = Utils->FindServer(prefix);
388 ServerInstance->SNO->WriteGlobalSno('l', "WTF: Got BURST from a non-server(?): %s", prefix.c_str());
392 ServerSource->bursting = true;
393 Utils->DoOneToAllButSender(prefix, command, params, prefix);
395 else if (command == "ENDBURST")
397 TreeServer* ServerSource = Utils->FindServer(prefix);
400 ServerInstance->SNO->WriteGlobalSno('l', "WTF: Got ENDBURST from a non-server(?): %s", prefix.c_str());
404 ServerSource->FinishBurst();
405 Utils->DoOneToAllButSender(prefix, command, params, prefix);
407 else if (command == "ENCAP")
409 this->Encap(who, params);
411 else if (command == "NICK")
413 if (params.size() != 2)
415 SendError("Protocol violation: Wrong number of parameters for NICK message");
421 SendError("Protocol violation: Server changing nick");
425 if ((isdigit(params[0][0])) && (params[0] != who->uuid))
427 SendError("Protocol violation: User changing nick to an invalid UID - " + params[0]);
431 /* Update timestamp on user when they change nicks */
432 who->age = ConvToInt(params[1]);
435 * On nick messages, check that the nick doesnt already exist here.
436 * If it does, perform collision logic.
438 User* x = ServerInstance->FindNickOnly(params[0]);
439 if ((x) && (x != who))
442 /* x is local, who is remote */
443 collideret = this->DoCollision(x, who->age, who->ident, who->GetIPString(), who->uuid);
447 * Remote client lost, or both lost, parsing or passing on this
448 * nickchange would be pointless, as the incoming client's server will
449 * soon recieve SVSNICK to change its nick to its UID. :) -- w00t
454 who->ForceNickChange(params[0].c_str());
455 Utils->RouteCommand(route_back_again, command, params, who);
459 Command* cmd = ServerInstance->Parser->GetHandler(command);
463 irc::stringjoiner pmlist(" ", params, 0, params.size() - 1);
464 ServerInstance->Logs->Log("m_spanningtree", LOG_SPARSE, "Unrecognised S2S command :%s %s %s",
465 who->uuid.c_str(), command.c_str(), pmlist.GetJoined().c_str());
466 SendError("Unrecognised command '" + command + "' -- possibly loaded mismatched modules");
470 if (params.size() < cmd->min_params)
472 irc::stringjoiner pmlist(" ", params, 0, params.size() - 1);
473 ServerInstance->Logs->Log("m_spanningtree", LOG_SPARSE, "Insufficient parameters for S2S command :%s %s %s",
474 who->uuid.c_str(), command.c_str(), pmlist.GetJoined().c_str());
475 SendError("Insufficient parameters for command '" + command + "'");
479 if ((!params.empty()) && (params.back().empty()) && (!cmd->allow_empty_last_param))
481 // the last param is empty and the command handler doesn't allow that, check if there will be enough params if we drop the last
482 if (params.size()-1 < cmd->min_params)
487 CmdResult res = cmd->Handle(params, who);
489 if (res == CMD_INVALID)
491 irc::stringjoiner pmlist(" ", params, 0, params.size() - 1);
492 ServerInstance->Logs->Log("m_spanningtree", LOG_SPARSE, "Error handling S2S command :%s %s %s",
493 who->uuid.c_str(), command.c_str(), pmlist.GetJoined().c_str());
494 SendError("Error handling '" + command + "' -- possibly loaded mismatched modules");
496 else if (res == CMD_SUCCESS)
497 Utils->RouteCommand(route_back_again, command, params, who);
501 void TreeSocket::OnTimeout()
503 ServerInstance->SNO->WriteGlobalSno('l', "CONNECT: Connection to \002%s\002 timed out.", linkID.c_str());
506 void TreeSocket::Close()
509 ServerInstance->GlobalCulls.AddItem(this);
510 this->BufferedSocket::Close();
511 SetError("Remote host closed connection");
513 // Connection closed.
514 // If the connection is fully up (state CONNECTED)
515 // then propogate a netsplit to all peers.
517 Squit(MyRoot,getError());
519 if (!ConnectionFailureShown)
521 ConnectionFailureShown = true;
522 ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\2%s\2' failed.",linkID.c_str());
524 time_t server_uptime = ServerInstance->Time() - this->age;
527 std::string timestr = Utils->Creator->TimeToStr(server_uptime);
528 ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\2%s\2' was established for %s", linkID.c_str(), timestr.c_str());