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1 /*       +------------------------------------+
2  *       | Inspire Internet Relay Chat Daemon |
3  *       +------------------------------------+
4  *
5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
6  * See: http://www.inspircd.org/wiki/index.php/Credits
7  *
8  * This program is free but copyrighted software; see
9  *            the file COPYING for details.
10  *
11  * ---------------------------------------------------
12  */
13
14 #include "inspircd.h"
15 #include "commands/cmd_whois.h"
16 #include "commands/cmd_stats.h"
17 #include "socket.h"
18 #include "xline.h"
19 #include "transport.h"
20 #include "socketengine.h"
21
22 #include "m_spanningtree/main.h"
23 #include "m_spanningtree/utils.h"
24 #include "m_spanningtree/treeserver.h"
25 #include "m_spanningtree/link.h"
26 #include "m_spanningtree/treesocket.h"
27 #include "m_spanningtree/resolvers.h"
28 #include "m_spanningtree/handshaketimer.h"
29
30 /* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_spanningtree/handshaketimer.h */
31
32 void TreeSocket::WriteLine(std::string line)
33 {
34         Instance->Logs->Log("m_spanningtree",DEBUG, "S[%d] O %s", this->GetFd(), line.c_str());
35         line.append("\r\n");
36         this->Write(line);
37 }
38
39
40 /* Handle ERROR command */
41 bool TreeSocket::Error(std::deque<std::string> &params)
42 {
43         if (params.size() < 1)
44                 return false;
45         this->Instance->SNO->WriteToSnoMask('l',"ERROR from %s: %s",(!InboundServerName.empty() ? InboundServerName.c_str() : myhost.c_str()),params[0].c_str());
46         /* we will return false to cause the socket to close. */
47         return false;
48 }
49
50 void TreeSocket::Split(const std::string &line, std::deque<std::string> &n)
51 {
52         n.clear();
53         irc::tokenstream tokens(line);
54         std::string param;
55         while (tokens.GetToken(param))
56         {
57                 n.push_back(param);
58         }
59         return;
60 }
61
62 bool TreeSocket::ProcessLine(std::string &line)
63 {
64         std::deque<std::string> params;
65         irc::string command;
66         std::string prefix;
67
68         line = line.substr(0, line.find_first_of("\r\n"));
69
70         if (line.empty())
71                 return true;
72
73         Instance->Logs->Log("m_spanningtree",DEBUG, "S[%d] I %s", this->GetFd(), line.c_str());
74
75         this->Split(line.c_str(),params);
76
77         if (params.empty())
78                 return true;
79
80         if ((params[0][0] == ':') && (params.size() > 1))
81         {
82                 prefix = params[0].substr(1);
83                 params.pop_front();
84
85                 if (prefix.empty())
86                 {
87                         this->SendError("BUG (?) Empty prefix recieved.");
88                         return false;
89                 }
90         }
91
92         command = params[0].c_str();
93         params.pop_front();
94
95         switch (this->LinkState)
96         {
97                 TreeServer* Node;
98
99                 case WAIT_AUTH_1:
100                         /*
101                          * State WAIT_AUTH_1:
102                          *  Waiting for SERVER command from remote server. Server initiating
103                          *  the connection sends the first SERVER command, listening server
104                          *  replies with theirs if its happy, then if the initiator is happy,
105                          *  it starts to send its net sync, which starts the merge, otherwise
106                          *  it sends an ERROR.
107                          */
108                         if (command == "PASS")
109                         {
110                                 /*
111                                  * Ignore this silently. Some services packages insist on sending PASS, even
112                                  * when it is not required (i.e. by us). We have to ignore this here, otherwise
113                                  * as it's an unknown command (effectively), it will cause the connection to be
114                                  * closed, which probably isn't what people want. -- w00t
115                                  */
116                         }
117                         else if (command == "SERVER")
118                         {
119                                 return this->Inbound_Server(params);
120                         }
121                         else if (command == "ERROR")
122                         {
123                                 return this->Error(params);
124                         }
125                         else if (command == "USER")
126                         {
127                                 this->SendError("Client connections to this port are prohibited.");
128                                 return false;
129                         }
130                         else if (command == "CAPAB")
131                         {
132                                 return this->Capab(params);
133                         }
134                         else
135                         {
136                                 // XXX ...wtf.
137                                 irc::string error = "Invalid command in negotiation phase: " + command;
138                                 this->SendError(assign(error));
139                                 return false;
140                         }
141                 break;
142                 case WAIT_AUTH_2:
143                         /*
144                          * State WAIT_AUTH_2:
145                          *  We have sent SERVER to the other side of the connection. Now we're waiting for them to start BURST.
146                          *  The other option at this stage of things, of course, is for them to close our connection thanks
147                          *  to invalid credentials.. -- w
148                          */
149                         if (command == "SERVER")
150                         {
151                                 /*
152                                  * Connection is either attempting to re-auth itself (stupid) or sending netburst without sending BURST.
153                                  * Both of these aren't allowable, so block them here. -- w
154                                  */
155                                 this->SendError("You may not re-authenticate or commence netburst without sending BURST.");
156                                 return true;
157                         }
158                         else if (command == "BURST")
159                         {
160                                 if (params.size())
161                                 {
162                                         time_t them = atoi(params[0].c_str());
163                                         time_t delta = them - Instance->Time();
164                                         if ((delta < -600) || (delta > 600))
165                                         {
166                                                 Instance->SNO->WriteToSnoMask('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));
167                                                 SendError("Your clocks are out by "+ConvToStr(abs((long)delta))+" seconds (this is more than five minutes). Link aborted, PLEASE SYNC YOUR CLOCKS!");
168                                                 return false;
169                                         }
170                                         else if ((delta < -30) || (delta > 30))
171                                         {
172                                                 Instance->SNO->WriteToSnoMask('l',"\2WARNING\2: Your clocks are out by %d seconds. Please consider synching your clocks.", abs((long)delta));
173                                         }
174                                 }
175                                 this->LinkState = CONNECTED;
176                                 Link* lnk = Utils->FindLink(InboundServerName);
177
178                                 Utils->timeoutlist.erase(this);
179
180                                 Node = new TreeServer(this->Utils, this->Instance, InboundServerName, InboundDescription, InboundSID, Utils->TreeRoot, this, lnk ? lnk->Hidden : false);
181
182                                 if (Node->DuplicateID())
183                                 {
184                                         this->SendError("Server ID "+InboundSID+" already exists on the network!");
185                                         this->Instance->SNO->WriteToSnoMask('l',"Server \2"+InboundServerName+"\2 being introduced from \2" + prefix + "\2 denied, server ID already exists on the network. Closing link.");
186                                         return false;
187                                 }
188
189                                 Utils->TreeRoot->AddChild(Node);
190                                 params.clear();
191                                 params.push_back(InboundServerName);
192                                 params.push_back("*");
193                                 params.push_back("1");
194                                 params.push_back(InboundSID);
195                                 params.push_back(":"+InboundDescription);
196                                 Utils->DoOneToAllButSender(Instance->Config->GetSID(),"SERVER",params,InboundServerName);
197                                 Node->bursting = true;
198                                 this->DoBurst(Node);
199                         }
200                         else if (command == "ERROR")
201                         {
202                                 return this->Error(params);
203                         }
204                         else if (command == "CAPAB")
205                         {
206                                 return this->Capab(params);
207                         }
208
209                 break;
210                 case CONNECTING:
211                         /*
212                          * State CONNECTING:
213                          *  We're connecting (OUTGOING) to another server. They are in state WAIT_AUTH_1 until they verify
214                          *  our credentials, when they proceed into WAIT_AUTH_2 and send SERVER to us. We then send BURST
215                          *  + our netburst, which will put them into CONNECTED state. -- w
216                          */
217                         if (command == "SERVER")
218                         {
219                                 // Our credentials have been accepted, send netburst. (this puts US into the CONNECTED state)
220                                 return this->Outbound_Reply_Server(params);
221                         }
222                         else if (command == "ERROR")
223                         {
224                                 return this->Error(params);
225                         }
226                         else if (command == "CAPAB")
227                         {
228                                 return this->Capab(params);
229                         }
230                 break;
231                 case CONNECTED:
232                         /*
233                         * State CONNECTED:
234                          *  Credentials have been exchanged, we've gotten their 'BURST' (or sent ours).
235                          *  Anything from here on should be accepted a little more reasonably.
236                          */
237                         if (!prefix.empty())
238                         {
239                                 /*
240                                  * Check for fake direction here, and drop any instances that are found.
241                                  * What is fake direction? Imagine the following server setup:
242                                  *    0AA <-> 0AB <-> 0AC
243                                  * Fake direction would be 0AC sending a message to 0AB claiming to be from
244                                  * 0AA, or something similar. Basically, a message taking a path that *cannot*
245                                  * be correct.
246                                  *
247                                  * When would this be seen?
248                                  * Well, hopefully never. It could be caused by race conditions, bugs, or
249                                  * "miscreant" servers, though, so let's check anyway. -- w
250                                  */
251                                 std::string direction = prefix;
252
253                                 User *t = this->Instance->FindUUID(prefix);
254                                 if (t)
255                                 {
256                                         direction = t->server;
257                                 }
258
259                                 TreeServer* route_back_again = Utils->BestRouteTo(direction);
260                                 if ((!route_back_again) || (route_back_again->GetSocket() != this))
261                                 {
262                                         if (route_back_again)
263                                                 Instance->Logs->Log("m_spanningtree",DEBUG,"Protocol violation: Fake direction in command '%s' from connection '%s'",line.c_str(),this->GetName().c_str());
264                                         return true;
265                                 }
266                                 /* Fix by brain:
267                                  * When there is activity on the socket, reset the ping counter so
268                                  * that we're not wasting bandwidth pinging an active server.
269                                  */
270                                 route_back_again->SetNextPingTime(Instance->Time() + Utils->PingFreq);
271                                 route_back_again->SetPingFlag();
272                         }
273                         else
274                         {
275                                 /*
276                                  * Empty prefix from a server to server link:
277                                  *  This is somewhat bad/naughty, so let's set the prefix
278                                  *  to be the link that we got it from, so we don't break anything. -- w
279                                  */
280                                 TreeServer* n = Utils->FindServer(GetName());
281                                 if (n)
282                                         prefix = n->GetID();
283                                 else
284                                         prefix = GetName();
285                         }
286
287                         /*
288                          * First up, check for any malformed commands (e.g. MODE without a timestamp)
289                          * and rewrite commands where necessary (SVSMODE -> MODE for services). -- w
290                          */
291                         if (command == "SVSMODE") // This isn't in an "else if" so we still force FMODE for changes on channels.
292                                 command = "MODE";
293
294                         /*
295                          * Now, check for (and parse) commands as appropriate. -- w
296                          */
297
298                         /* Find the server that this command originated from, used in the handlers below */
299                         TreeServer *ServerSource = Utils->FindServer(prefix);
300
301                         /* Find the link we just got this from so we don't bounce it back incorrectly */
302                         std::string sourceserv = this->myhost;
303                         if (!this->InboundServerName.empty())
304                         {
305                                 sourceserv = this->InboundServerName;
306                         }
307
308                         /*
309                          * XXX one of these days, this needs to be moved into class Commands.
310                          */
311                         if (command == "UID")
312                         {
313                                 return this->ParseUID(prefix, params);
314                         }
315                         else if (command == "FJOIN")
316                         {
317                                 return this->ForceJoin(prefix,params);
318                         }
319                         else if ((command == "NOTICE" || command == "PRIVMSG") && (Utils->IsServer(prefix)))
320                         {
321                                 return this->ServerMessage(assign(command), prefix, params, sourceserv);
322                         }
323                         else if (command == "STATS")
324                         {
325                                 return this->Stats(prefix, params);
326                         }
327                         else if (command == "MOTD")
328                         {
329                                 return this->Motd(prefix, params);
330                         }
331                         else if (command == "KILL" && ServerSource)
332                         {
333                                 // Kill from a server
334                                 return this->RemoteKill(prefix,params);
335                         }
336                         else if (command == "MODULES")
337                         {
338                                 return this->Modules(prefix, params);
339                         }
340                         else if (command == "ADMIN")
341                         {
342                                 return this->Admin(prefix, params);
343                         }
344                         else if (command == "MAP")
345                         {
346                                 User* user = Instance->FindNick(prefix);
347                                 if (user)
348                                 {
349                                         std::vector<std::string> p(params.begin(), params.end());
350                                         return Utils->Creator->HandleMap(p, user);
351                                 }
352                         }
353                         else if (command == "SERVER")
354                         {
355                                 return this->RemoteServer(prefix,params);
356                         }
357                         else if (command == "ERROR")
358                         {
359                                 return this->Error(params);
360                         }
361                         else if (command == "OPERTYPE")
362                         {
363                                 return this->OperType(prefix,params);
364                         }
365                         else if (command == "FMODE")
366                         {
367                                 return this->ForceMode(prefix,params);
368                         }
369                         else if (command == "FTOPIC")
370                         {
371                                 return this->ForceTopic(prefix,params);
372                         }
373                         else if (command == "METADATA")
374                         {
375                                 return this->MetaData(prefix,params);
376                         }
377                         else if (command == "PING")
378                         {
379                                 return this->LocalPing(prefix,params);
380                         }
381                         else if (command == "PONG")
382                         {
383                                 TreeServer *s = Utils->FindServer(prefix);
384                                 if (s && s->bursting)
385                                 {
386                                         Instance->SNO->WriteToSnoMask('l',"Server \002%s\002 has not finished burst, forcing end of burst (send ENDBURST!)", prefix.c_str());
387                                         s->FinishBurst();
388                                 }
389                                 return this->LocalPong(prefix,params);
390                         }
391                         else if (command == "VERSION")
392                         {
393                                 return this->ServerVersion(prefix,params);
394                         }
395                         else if (command == "FHOST")
396                         {
397                                 return this->ChangeHost(prefix,params);
398                         }
399                         else if (command == "FNAME")
400                         {
401                                 return this->ChangeName(prefix,params);
402                         }
403                         else if (command == "ADDLINE")
404                         {
405                                 return this->AddLine(prefix,params);
406                         }
407                         else if (command == "DELLINE")
408                         {
409                                 return this->DelLine(prefix,params);
410                         }
411                         else if (command == "SVSNICK")
412                         {
413                                 return this->ForceNick(prefix,params);
414                         }
415                         else if (command == "OPERQUIT")
416                         {
417                                 return this->OperQuit(prefix,params);
418                         }
419                         else if (command == "IDLE")
420                         {
421                                 return this->Whois(prefix,params);
422                         }
423                         else if (command == "PUSH")
424                         {
425                                 return this->Push(prefix,params);
426                         }
427                         else if (command == "TIME")
428                         {
429                                 return this->Time(prefix,params);
430                         }
431                         else if ((command == "KICK") && (Utils->IsServer(prefix)))
432                         {
433                                 if (params.size() == 3)
434                                 {
435                                         TreeServer* pf = Utils->FindServer(prefix);
436                                         User* user = this->Instance->FindNick(params[1]);
437                                         Channel* chan = this->Instance->FindChan(params[0]);
438                                         if (pf && user && chan)
439                                         {
440                                                 if (!chan->ServerKickUser(user, params[2].c_str(), false, pf->GetName().c_str()))
441                                                         /* Yikes, the channels gone! */
442                                                         delete chan;
443                                         }
444                                 }
445
446                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
447                         }
448                         else if (command == "SVSJOIN")
449                         {
450                                 return this->ServiceJoin(prefix,params);
451                         }
452                         else if (command == "SVSPART")
453                         {
454                                 return this->ServicePart(prefix,params);
455                         }
456                         else if (command == "SQUIT")
457                         {
458                                 if (params.size() == 2)
459                                 {
460                                         this->Squit(Utils->FindServer(params[0]),params[1]);
461                                 }
462                                 return true;
463                         }
464                         else if (command == "MODENOTICE")
465                         {
466                                 if (params.size() >= 2)
467                                 {
468                                         if (ServerSource)
469                                                 Instance->Users->WriteMode(params[0].c_str(), WM_AND, "*** From %s: %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()), params[1].c_str());
470                                 }
471                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
472                         }
473                         else if (command == "SNONOTICE")
474                         {
475                                 if (params.size() >= 2)
476                                 {
477                                         Instance->SNO->WriteToSnoMask(*(params[0].c_str()), "From " + (ServerSource ? ServerSource->GetName().c_str() : prefix) + ": "+ params[1]);
478                                         return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
479                                 }
480
481                         }
482                         else if (command == "BURST")
483                         {
484                                 // Set prefix server as bursting
485                                 if (!ServerSource)
486                                 {
487                                         this->Instance->SNO->WriteToSnoMask('l', "WTF: Got BURST from a nonexistant server(?): %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()));
488                                         return false;
489                                 }
490
491                                 ServerSource->bursting = true;
492                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
493                         }
494                         else if (command == "ENDBURST")
495                         {
496                                 if (!ServerSource)
497                                 {
498                                         this->Instance->SNO->WriteToSnoMask('l', "WTF: Got ENDBURST from a nonexistant server(?): %s", (ServerSource ? ServerSource->GetName().c_str() : prefix.c_str()));
499                                         return false;
500                                 }
501
502                                 ServerSource->FinishBurst();
503                                 return Utils->DoOneToAllButSenderRaw(line, sourceserv, prefix, command, params);
504                         }
505                         else if (command == "ENCAP")
506                         {
507                                 return this->Encap(prefix, params);
508                         }
509                         else if (command == "MODE" && !this->Instance->FindUUID(prefix)) // XXX we should check for no such serv?
510                         {
511                                 // Server-prefix MODE.
512                                 std::vector<std::string> modelist(params.begin(), params.end());
513
514                                 /* We don't support this for channel mode changes any more! */
515                                 if (params.size() >= 1)
516                                 {
517                                         if (Instance->FindChan(params[0]))
518                                         {
519                                                 this->SendError("Protocol violation by '"+(ServerSource ? ServerSource->GetName().c_str() : prefix)+"'! MODE for channel mode changes is not supported by the InspIRCd 1.2 protocol. You must use FMODE to preserve channel timestamps.");
520                                                 return false;
521                                         }
522                                 }
523
524                                 // Insert into the parser
525                                 this->Instance->SendMode(modelist, this->Instance->FakeClient);
526
527                                 // Pass out to the network
528                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
529                         }
530                         else
531                         {
532                                 /*
533                                  * Not a special s2s command. Emulate the user doing it.
534                                  * This saves us having a huge ugly command parser again.
535                                  */
536                                 User *who = this->Instance->FindUUID(prefix);
537
538                                 if (!who)
539                                 {
540                                         // this looks ugly because command is an irc::string
541                                         this->SendError("Command (" + std::string(command.c_str()) + ") from unknown prefix (" + prefix + ")! Dropping link.");
542                                         return false;
543                                 }
544
545                                 if (command == "NICK")
546                                 {
547                                         if (params.size() != 2)
548                                         {
549                                                 SendError("Protocol violation: NICK message without TS - :"+std::string(who->uuid)+" NICK "+params[0]);
550                                                 return false;
551                                         }
552                                         /* Update timestamp on user when they change nicks */
553                                         who->age = atoi(params[1].c_str());
554
555                                         /*
556                                          * On nick messages, check that the nick doesnt already exist here.
557                                          * If it does, perform collision logic.
558                                          */
559                                         User* x = this->Instance->FindNickOnly(params[0]);
560                                         if ((x) && (x != who))
561                                         {
562                                                 int collideret = 0;
563                                                 /* x is local, who is remote */
564                                                 collideret = this->DoCollision(x, who->age, who->ident, who->GetIPString(), who->uuid);
565                                                 if (collideret != 1)
566                                                 {
567                                                         /*
568                                                          * Remote client lost, or both lost, parsing this nickchange would be
569                                                          * pointless, as the incoming client's server will soon recieve SVSNICK to
570                                                          * change its nick to its UID. :) -- w00t
571                                                          */
572                                                         return true;
573                                                 }
574                                         }
575                                 }
576
577                                 // its a user
578                                 std::vector<std::string> strparams(params.begin(), params.end());
579
580                                 switch (this->Instance->CallCommandHandler(command.c_str(), strparams, who))
581                                 {
582                                         case CMD_INVALID:
583                                                 /*
584                                                  * XXX: command is irc::string, hence ugliness
585                                                  */
586                                                 this->SendError("Unrecognised or malformed command '" + std::string(command.c_str()) + "' -- possibly loaded mismatched modules");
587                                                 return false;
588                                                 break;
589                                         case CMD_FAILURE:
590                                                 /*
591                                                  * CMD_LOCALONLY is aliased to CMD_FAILURE, so this won't go out onto the network.
592                                                  */
593                                                 return true;
594                                                 break;
595                                         default:
596                                                 /* CMD_SUCCESS falls through here */
597                                                 break;
598                                 }
599
600                                 return Utils->DoOneToAllButSenderRaw(line,sourceserv,prefix,command,params);
601
602                         }
603                         return true;
604                         break; // end of state CONNECTED (phew).
605         }
606         return true;
607 }
608
609 std::string TreeSocket::GetName()
610 {
611         std::string sourceserv = this->myhost;
612         if (!this->InboundServerName.empty())
613         {
614                 sourceserv = this->InboundServerName;
615         }
616         return sourceserv;
617 }
618
619 void TreeSocket::OnTimeout()
620 {
621         if (this->LinkState == CONNECTING)
622         {
623                 Utils->Creator->RemoteMessage(NULL, "CONNECT: Connection to \002%s\002 timed out.", myhost.c_str());
624                 Link* MyLink = Utils->FindLink(myhost);
625                 if (MyLink)
626                         Utils->DoFailOver(MyLink);
627         }
628 }
629
630 void TreeSocket::OnClose()
631 {
632         // Test fix for big fuckup
633         if (this->LinkState != CONNECTED)
634                 return;
635
636         // Connection closed.
637         // If the connection is fully up (state CONNECTED)
638         // then propogate a netsplit to all peers.
639         std::string quitserver = this->myhost;
640         if (!this->InboundServerName.empty())
641         {
642                 quitserver = this->InboundServerName;
643         }
644         TreeServer* s = Utils->FindServer(quitserver);
645         if (s)
646         {
647                 Squit(s,"Remote host closed the connection");
648         }
649
650         if (!quitserver.empty())
651         {
652                 Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' failed.",quitserver.c_str());
653                 time_t server_uptime = Instance->Time() - this->age;
654                 if (server_uptime)
655                         Utils->Creator->RemoteMessage(NULL,"Connection to '\2%s\2' was established for %s", quitserver.c_str(), Utils->Creator->TimeToStr(server_uptime).c_str());
656         }
657 }
658
659