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(MODNAME, 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));
164 // Check for duplicate server name/sid again, it's possible that a new
165 // server was introduced while we were waiting for them to send BURST.
166 // (we do not reserve their server name/sid when they send SERVER, we do it now)
167 if (!CheckDuplicate(capab->name, capab->sid))
170 this->LinkState = CONNECTED;
171 Utils->timeoutlist.erase(this);
173 linkID = capab->name;
175 MyRoot = new TreeServer(capab->name, capab->description, capab->sid, Utils->TreeRoot, this, capab->hidden);
176 Utils->TreeRoot->AddChild(MyRoot);
178 MyRoot->bursting = true;
179 this->DoBurst(MyRoot);
181 parameterlist sparams;
182 sparams.push_back(MyRoot->GetName());
183 sparams.push_back("*");
184 sparams.push_back("0");
185 sparams.push_back(MyRoot->GetID());
186 sparams.push_back(":" + MyRoot->GetDesc());
187 Utils->DoOneToAllButSender(ServerInstance->Config->GetSID(), "SERVER", sparams, MyRoot->GetName());
188 Utils->DoOneToAllButSender(MyRoot->GetID(), "BURST", params, MyRoot->GetName());
190 else if (command == "ERROR")
194 else if (command == "CAPAB")
203 * We're connecting (OUTGOING) to another server. They are in state WAIT_AUTH_1 until they verify
204 * our credentials, when they proceed into WAIT_AUTH_2 and send SERVER to us. We then send BURST
205 * + our netburst, which will put them into CONNECTED state. -- w
207 if (command == "SERVER")
209 // Our credentials have been accepted, send netburst. (this puts US into the CONNECTED state)
210 this->Outbound_Reply_Server(params);
212 else if (command == "ERROR")
216 else if (command == "CAPAB")
224 * Credentials have been exchanged, we've gotten their 'BURST' (or sent ours).
225 * Anything from here on should be accepted a little more reasonably.
227 this->ProcessConnectedLine(prefix, command, params);
234 void TreeSocket::ProcessConnectedLine(std::string& prefix, std::string& command, parameterlist& params)
236 User* who = ServerInstance->FindUUID(prefix);
237 std::string direction;
241 TreeServer* ServerSource = Utils->FindServer(prefix);
243 ServerSource = MyRoot;
247 who = ServerSource->ServerUser;
251 /* It is important that we don't close the link here, unknown prefix can occur
252 * due to various race conditions such as the KILL message for a user somehow
253 * crossing the users QUIT further upstream from the server. Thanks jilles!
256 if ((prefix.length() == UIDGenerator::UUID_LENGTH) && (isdigit(prefix[0])) &&
257 ((command == "FMODE") || (command == "MODE") || (command == "KICK") || (command == "TOPIC") || (command == "KILL") || (command == "ADDLINE") || (command == "DELLINE")))
259 /* Special case, we cannot drop these commands as they've been committed already on a
260 * part of the network by the time we receive them, so in this scenario pretend the
261 * command came from a server to avoid desync.
264 who = ServerInstance->FindUUID(prefix.substr(0, 3));
266 who = this->MyRoot->ServerUser;
270 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Command '%s' from unknown prefix '%s'! Dropping entire command.",
271 command.c_str(), prefix.c_str());
277 // Make sure prefix is still good
278 direction = who->server;
282 * Check for fake direction here, and drop any instances that are found.
283 * What is fake direction? Imagine the following server setup:
284 * 0AA <-> 0AB <-> 0AC
285 * Fake direction would be 0AC sending a message to 0AB claiming to be from
286 * 0AA, or something similar. Basically, a message taking a path that *cannot*
289 * When would this be seen?
290 * Well, hopefully never. It could be caused by race conditions, bugs, or
291 * "miscreant" servers, though, so let's check anyway. -- w
293 * We also check here for totally invalid prefixes (prefixes that are neither
294 * a valid SID or a valid UUID, so that invalid UUID or SID never makes it
295 * to the higher level functions. -- B
297 TreeServer* route_back_again = Utils->BestRouteTo(direction);
298 if ((!route_back_again) || (route_back_again->GetSocket() != this))
300 if (route_back_again)
301 ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Protocol violation: Fake direction '%s' from connection '%s'",
302 prefix.c_str(),linkID.c_str());
306 // Translate commands coming from servers using an older protocol
307 if (proto_version < ProtocolVersion)
309 if (!PreProcessOldProtocolMessage(who, command, params))
313 ServerCommand* scmd = Utils->Creator->CmdManager.GetHandler(command);
314 CommandBase* cmdbase = scmd;
318 // Not a special server-to-server command
319 cmd = ServerInstance->Parser->GetHandler(command);
322 irc::stringjoiner pmlist(params);
323 ServerInstance->Logs->Log(MODNAME, LOG_SPARSE, "Unrecognised S2S command :%s %s %s",
324 who->uuid.c_str(), command.c_str(), pmlist.GetJoined().c_str());
325 SendError("Unrecognised command '" + command + "' -- possibly loaded mismatched modules");
331 if (params.size() < cmdbase->min_params)
333 irc::stringjoiner pmlist(params);
334 ServerInstance->Logs->Log(MODNAME, LOG_SPARSE, "Insufficient parameters for S2S command :%s %s %s",
335 who->uuid.c_str(), command.c_str(), pmlist.GetJoined().c_str());
336 SendError("Insufficient parameters for command '" + command + "'");
340 if ((!params.empty()) && (params.back().empty()) && (!cmdbase->allow_empty_last_param))
342 // 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
343 if (params.size()-1 < cmdbase->min_params)
350 res = scmd->Handle(who, params);
352 res = cmd->Handle(params, who);
354 if (res == CMD_INVALID)
356 irc::stringjoiner pmlist(params);
357 ServerInstance->Logs->Log(MODNAME, LOG_SPARSE, "Error handling S2S command :%s %s %s",
358 who->uuid.c_str(), command.c_str(), pmlist.GetJoined().c_str());
359 SendError("Error handling '" + command + "' -- possibly loaded mismatched modules");
361 else if (res == CMD_SUCCESS)
362 Utils->RouteCommand(route_back_again, cmdbase, params, who);
365 void TreeSocket::OnTimeout()
367 ServerInstance->SNO->WriteGlobalSno('l', "CONNECT: Connection to \002%s\002 timed out.", linkID.c_str());
370 void TreeSocket::Close()
373 ServerInstance->GlobalCulls.AddItem(this);
374 this->BufferedSocket::Close();
375 SetError("Remote host closed connection");
377 // Connection closed.
378 // If the connection is fully up (state CONNECTED)
379 // then propogate a netsplit to all peers.
381 Squit(MyRoot,getError());
383 if (!ConnectionFailureShown)
385 ConnectionFailureShown = true;
386 ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\2%s\2' failed.",linkID.c_str());
388 time_t server_uptime = ServerInstance->Time() - this->age;
391 std::string timestr = ModuleSpanningTree::TimeToStr(server_uptime);
392 ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\2%s\2' was established for %s", linkID.c_str(), timestr.c_str());