1 /* +------------------------------------+
2 * | Inspire Internet Relay Chat Daemon |
3 * +------------------------------------+
5 * InspIRCd: (C) 2002-2007 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 * ---------------------------------------------------
15 #include "configreader.h"
19 #include "commands/cmd_whois.h"
20 #include "commands/cmd_stats.h"
24 #include "transport.h"
26 #include "socketengine.h"
28 #include "m_spanningtree/main.h"
29 #include "m_spanningtree/utils.h"
30 #include "m_spanningtree/treeserver.h"
31 #include "m_spanningtree/link.h"
32 #include "m_spanningtree/treesocket.h"
33 #include "m_spanningtree/resolvers.h"
34 #include "m_spanningtree/handshaketimer.h"
36 /* $ModDep: m_spanningtree/timesynctimer.h 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_hash.h */
39 /** Because most of the I/O gubbins are encapsulated within
40 * InspSocket, we just call the superclass constructor for
41 * most of the action, and append a few of our own values
44 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, Module* HookMod)
45 : InspSocket(SI, host, port, listening, maxtime), Utils(Util), Hook(HookMod)
48 this->LinkState = LISTENER;
49 theirchallenge.clear();
51 if (listening && Hook)
52 InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
55 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string host, int port, bool listening, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod)
56 : InspSocket(SI, host, port, listening, maxtime, bindto), Utils(Util), Hook(HookMod)
59 theirchallenge.clear();
61 this->LinkState = CONNECTING;
63 InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
66 /** When a listening socket gives us a new file descriptor,
67 * we must associate it with a socket without creating a new
68 * connection. This constructor is used for this purpose.
70 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod)
71 : InspSocket(SI, newfd, ip), Utils(Util), Hook(HookMod)
73 this->LinkState = WAIT_AUTH_1;
74 theirchallenge.clear();
76 /* If we have a transport module hooked to the parent, hook the same module to this
77 * socket, and set a timer waiting for handshake before we send CAPAB etc.
80 InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
82 Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(Utils->LinkBlocks[0]), this->Utils, 1));
85 ServerState TreeSocket::GetLinkState()
87 return this->LinkState;
90 Module* TreeSocket::GetHook()
95 TreeSocket::~TreeSocket()
98 InspSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send();
100 Utils->DelBurstingServer(this);
103 const std::string& TreeSocket::GetOurChallenge()
105 return this->ourchallenge;
108 void TreeSocket::SetOurChallenge(const std::string &c)
110 this->ourchallenge = c;
113 const std::string& TreeSocket::GetTheirChallenge()
115 return this->theirchallenge;
118 void TreeSocket::SetTheirChallenge(const std::string &c)
120 this->theirchallenge = c;
123 std::string TreeSocket::MakePass(const std::string &password, const std::string &challenge)
125 /* This is a simple (maybe a bit hacky?) HMAC algorithm, thanks to jilles for
126 * suggesting the use of HMAC to secure the password against various attacks.
128 * Note: If m_sha256.so is not loaded, we MUST fall back to plaintext with no
129 * HMAC challenge/response.
131 Module* sha256 = Instance->FindModule("m_sha256.so");
132 if (Utils->ChallengeResponse && sha256 && !challenge.empty())
134 /* XXX: This is how HMAC is supposed to be done:
136 * sha256( (pass xor 0x5c) + sha256((pass xor 0x36) + m) )
138 * Note that we are encoding the hex hash, not the binary
139 * output of the hash which is slightly different to standard.
141 * Don't ask me why its always 0x5c and 0x36... it just is.
143 std::string hmac1, hmac2;
145 for (size_t n = 0; n < password.length(); n++)
147 hmac1 += static_cast<char>(password[n] ^ 0x5C);
148 hmac2 += static_cast<char>(password[n] ^ 0x36);
152 HashResetRequest(Utils->Creator, sha256).Send();
153 hmac2 = HashSumRequest(Utils->Creator, sha256, hmac2).Send();
155 HashResetRequest(Utils->Creator, sha256).Send();
156 std::string hmac = hmac1 + hmac2;
157 hmac = HashSumRequest(Utils->Creator, sha256, hmac).Send();
159 return "HMAC-SHA256:"+ hmac;
161 else if (!challenge.empty() && !sha256)
162 Instance->Log(DEFAULT,"Not authenticating to server using SHA256/HMAC because we don't have m_sha256 loaded!");
167 /** When an outbound connection finishes connecting, we receive
168 * this event, and must send our SERVER string to the other
169 * side. If the other side is happy, as outlined in the server
170 * to server docs on the inspircd.org site, the other side
171 * will then send back its own server string.
173 bool TreeSocket::OnConnected()
175 if (this->LinkState == CONNECTING)
177 /* we do not need to change state here. */
178 for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
180 if (x->Name == this->myhost)
182 this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] started.");
185 InspSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
186 this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2["+(x->HiddenFromStats ? "<hidden>" : this->GetIP())+"] using transport \2"+x->Hook+"\2");
188 this->OutboundPass = x->SendPass;
190 /* found who we're supposed to be connecting to, send the neccessary gubbins. */
192 Instance->Timers->AddTimer(new HandshakeTimer(Instance, this, &(*x), this->Utils, 1));
194 this->SendCapabilities();
200 /* There is a (remote) chance that between the /CONNECT and the connection
201 * being accepted, some muppet has removed the <link> block and rehashed.
202 * If that happens the connection hangs here until it's closed. Unlikely
203 * and rather harmless.
205 this->Instance->SNO->WriteToSnoMask('l',"Connection to \2"+myhost+"\2 lost link tag(!)");
209 void TreeSocket::OnError(InspSocketError e)
216 this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Connection to \002"+myhost+"\002 refused");
217 MyLink = Utils->FindLink(myhost);
219 Utils->DoFailOver(MyLink);
222 this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Could not create socket");
225 this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Error binding socket to address or port");
228 this->Instance->SNO->WriteToSnoMask('l',"Connection failed: I/O error on connection");
230 case I_ERR_NOMOREFDS:
231 this->Instance->SNO->WriteToSnoMask('l',"Connection failed: Operating system is out of file descriptors!");
234 if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
236 std::string errstr = strerror(errno);
237 this->Instance->SNO->WriteToSnoMask('l',"Connection to \002"+myhost+"\002 failed with OS error: " + errstr);
243 int TreeSocket::OnDisconnect()
245 /* For the same reason as above, we don't
246 * handle OnDisconnect()
251 /** Recursively send the server tree with distances as hops.
252 * This is used during network burst to inform the other server
253 * (and any of ITS servers too) of what servers we know about.
254 * If at any point any of these servers already exist on the other
255 * end, our connection may be terminated. The hopcounts given
256 * by this function are relative, this doesn't matter so long as
257 * they are all >1, as all the remote servers re-calculate them
258 * to be relative too, with themselves as hop 0.
260 void TreeSocket::SendServers(TreeServer* Current, TreeServer* s, int hops)
263 for (unsigned int q = 0; q < Current->ChildCount(); q++)
265 TreeServer* recursive_server = Current->GetChild(q);
266 if (recursive_server != s)
268 snprintf(command,1024,":%s SERVER %s * %d :%s",Current->GetName().c_str(),recursive_server->GetName().c_str(),hops,recursive_server->GetDesc().c_str());
269 this->WriteLine(command);
270 this->WriteLine(":"+recursive_server->GetName()+" VERSION :"+recursive_server->GetVersion());
271 /* down to next level */
272 this->SendServers(recursive_server, s, hops+1);
277 std::string TreeSocket::MyCapabilities()
279 std::vector<std::string> modlist;
280 std::string capabilities;
281 for (int i = 0; i <= this->Instance->GetModuleCount(); i++)
283 if (this->Instance->modules[i]->GetVersion().Flags & VF_COMMON)
284 modlist.push_back(this->Instance->Config->module_names[i]);
286 sort(modlist.begin(),modlist.end());
287 for (unsigned int i = 0; i < modlist.size(); i++)
290 capabilities = capabilities + ",";
291 capabilities = capabilities + modlist[i];
296 std::string TreeSocket::RandString(unsigned int length)
298 char* randombuf = new char[length+1];
303 int fd = open("/dev/urandom", O_RDONLY, 0);
309 read(fd, randombuf, length);
315 for (unsigned int i = 0; i < length; i++)
316 randombuf[i] = rand();
319 for (unsigned int i = 0; i < length; i++)
321 char randchar = static_cast<char>((randombuf[i] & 0x7F) | 0x21);
322 out += (randchar == '=' ? '_' : randchar);
329 void TreeSocket::SendCapabilities()
331 irc::commasepstream modulelist(MyCapabilities());
332 this->WriteLine("CAPAB START");
334 /* Send module names, split at 509 length */
335 std::string item = "*";
336 std::string line = "CAPAB MODULES ";
337 while ((item = modulelist.GetToken()) != "")
339 if (line.length() + item.length() + 1 > 509)
341 this->WriteLine(line);
342 line = "CAPAB MODULES ";
345 if (line != "CAPAB MODULES ")
350 if (line != "CAPAB MODULES ")
351 this->WriteLine(line);
358 #ifdef SUPPORT_IP6LINKS
362 /* Do we have sha256 available? If so, we send a challenge */
363 if (Utils->ChallengeResponse && (Instance->FindModule("m_sha256.so")))
365 this->SetOurChallenge(RandString(20));
366 extra = " CHALLENGE=" + this->GetOurChallenge();
369 this->WriteLine("CAPAB CAPABILITIES :NICKMAX="+ConvToStr(NICKMAX)+" HALFOP="+ConvToStr(this->Instance->Config->AllowHalfop)+" CHANMAX="+ConvToStr(CHANMAX)+" MAXMODES="+ConvToStr(MAXMODES)+" IDENTMAX="+ConvToStr(IDENTMAX)+" MAXQUIT="+ConvToStr(MAXQUIT)+" MAXTOPIC="+ConvToStr(MAXTOPIC)+" MAXKICK="+ConvToStr(MAXKICK)+" MAXGECOS="+ConvToStr(MAXGECOS)+" MAXAWAY="+ConvToStr(MAXAWAY)+" IP6NATIVE="+ConvToStr(ip6)+" IP6SUPPORT="+ConvToStr(ip6support)+" PROTOCOL="+ConvToStr(ProtocolVersion)+extra+" PREFIX="+Instance->Modes->BuildPrefixes()+" CHANMODES="+Instance->Modes->ChanModes());
371 this->WriteLine("CAPAB END");
374 /* Check a comma seperated list for an item */
375 bool TreeSocket::HasItem(const std::string &list, const std::string &item)
377 irc::commasepstream seplist(list);
378 std::string item2 = "*";
379 while ((item2 = seplist.GetToken()) != "")
387 /* Isolate and return the elements that are different between two comma seperated lists */
388 std::string TreeSocket::ListDifference(const std::string &one, const std::string &two)
390 irc::commasepstream list_one(one);
391 std::string item = "*";
393 while ((item = list_one.GetToken()) != "")
395 if (!HasItem(two, item))
404 void TreeSocket::SendError(const std::string &errormessage)
406 /* Display the error locally as well as sending it remotely */
407 this->WriteLine("ERROR :"+errormessage);
408 this->Instance->SNO->WriteToSnoMask('l',"Sent \2ERROR\2 to "+this->InboundServerName+": "+errormessage);
409 /* One last attempt to make sure the error reaches its target */
410 this->FlushWriteBuffer();
413 bool TreeSocket::Capab(const std::deque<std::string> ¶ms)
415 if (params.size() < 1)
417 this->SendError("Invalid number of parameters for CAPAB - Mismatched version");
420 if (params[0] == "START")
422 this->ModuleList.clear();
423 this->CapKeys.clear();
425 else if (params[0] == "END")
429 #ifdef SUPPORT_IP6LINKS
432 /* Compare ModuleList and check CapKeys...
433 * Maybe this could be tidier? -- Brain
435 if ((this->ModuleList != this->MyCapabilities()) && (this->ModuleList.length()))
437 std::string diff = ListDifference(this->ModuleList, this->MyCapabilities());
440 diff = "your server:" + ListDifference(this->MyCapabilities(), this->ModuleList);
444 diff = "this server:" + diff;
446 if (diff.length() == 12)
447 reason = "Module list in CAPAB is not alphabetically ordered, cannot compare lists.";
449 reason = "Modules loaded on these servers are not correctly matched, these modules are not loaded on " + diff;
452 cap_validation valid_capab[] = {
453 {"Maximum nickname lengths differ or remote nickname length not specified", "NICKMAX", NICKMAX},
454 {"Maximum ident lengths differ or remote ident length not specified", "IDENTMAX", IDENTMAX},
455 {"Maximum channel lengths differ or remote channel length not specified", "CHANMAX", CHANMAX},
456 {"Maximum modes per line differ or remote modes per line not specified", "MAXMODES", MAXMODES},
457 {"Maximum quit lengths differ or remote quit length not specified", "MAXQUIT", MAXQUIT},
458 {"Maximum topic lengths differ or remote topic length not specified", "MAXTOPIC", MAXTOPIC},
459 {"Maximum kick lengths differ or remote kick length not specified", "MAXKICK", MAXKICK},
460 {"Maximum GECOS (fullname) lengths differ or remote GECOS length not specified", "MAXGECOS", MAXGECOS},
461 {"Maximum awaymessage lengths differ or remote awaymessage length not specified", "MAXAWAY", MAXAWAY},
465 if (((this->CapKeys.find("IP6SUPPORT") == this->CapKeys.end()) && (ip6support)) || ((this->CapKeys.find("IP6SUPPORT") != this->CapKeys.end()) && (this->CapKeys.find("IP6SUPPORT")->second != ConvToStr(ip6support))))
466 reason = "We don't both support linking to IPV6 servers";
467 if (((this->CapKeys.find("IP6NATIVE") != this->CapKeys.end()) && (this->CapKeys.find("IP6NATIVE")->second == "1")) && (!ip6support))
468 reason = "The remote server is IPV6 native, and we don't support linking to IPV6 servers";
469 if (((this->CapKeys.find("PROTOCOL") == this->CapKeys.end()) || ((this->CapKeys.find("PROTOCOL") != this->CapKeys.end()) && (this->CapKeys.find("PROTOCOL")->second != ConvToStr(ProtocolVersion)))))
471 if (this->CapKeys.find("PROTOCOL") != this->CapKeys.end())
472 reason = "Mismatched protocol versions "+this->CapKeys.find("PROTOCOL")->second+" and "+ConvToStr(ProtocolVersion);
474 reason = "Protocol version not specified";
477 if(this->CapKeys.find("PREFIX") != this->CapKeys.end() && this->CapKeys.find("PREFIX")->second != this->Instance->Modes->BuildPrefixes())
478 reason = "One or more of the prefixes on the remote server are invalid on this server.";
480 if (((this->CapKeys.find("HALFOP") == this->CapKeys.end()) && (Instance->Config->AllowHalfop)) || ((this->CapKeys.find("HALFOP") != this->CapKeys.end()) && (this->CapKeys.find("HALFOP")->second != ConvToStr(Instance->Config->AllowHalfop))))
481 reason = "We don't both have halfop support enabled/disabled identically";
483 for (int x = 0; valid_capab[x].size; ++x)
485 if (((this->CapKeys.find(valid_capab[x].key) == this->CapKeys.end()) || ((this->CapKeys.find(valid_capab[x].key) != this->CapKeys.end()) &&
486 (this->CapKeys.find(valid_capab[x].key)->second != ConvToStr(valid_capab[x].size)))))
487 reason = valid_capab[x].reason;
490 /* Challenge response, store their challenge for our password */
491 std::map<std::string,std::string>::iterator n = this->CapKeys.find("CHALLENGE");
492 if (Utils->ChallengeResponse && (n != this->CapKeys.end()) && (Instance->FindModule("m_sha256.so")))
494 /* Challenge-response is on now */
495 this->SetTheirChallenge(n->second);
496 if (!this->GetTheirChallenge().empty() && (this->LinkState == CONNECTING))
498 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+this->MakePass(OutboundPass, this->GetTheirChallenge())+" 0 :"+this->Instance->Config->ServerDesc);
503 /* They didnt specify a challenge or we don't have m_sha256.so, we use plaintext */
504 if (this->LinkState == CONNECTING)
505 this->WriteLine(std::string("SERVER ")+this->Instance->Config->ServerName+" "+OutboundPass+" 0 :"+this->Instance->Config->ServerDesc);
510 this->SendError("CAPAB negotiation failed: "+reason);
514 else if ((params[0] == "MODULES") && (params.size() == 2))
516 if (!this->ModuleList.length())
518 this->ModuleList.append(params[1]);
522 this->ModuleList.append(",");
523 this->ModuleList.append(params[1]);
527 else if ((params[0] == "CAPABILITIES") && (params.size() == 2))
529 irc::tokenstream capabs(params[1]);
532 while ((more = capabs.GetToken(item)))
534 /* Process each key/value pair */
535 std::string::size_type equals = item.rfind('=');
536 if (equals != std::string::npos)
538 std::string var = item.substr(0, equals);
539 std::string value = item.substr(equals+1, item.length());
540 CapKeys[var] = value;
547 /** This function forces this server to quit, removing this server
548 * and any users on it (and servers and users below that, etc etc).
549 * It's very slow and pretty clunky, but luckily unless your network
550 * is having a REAL bad hair day, this function shouldnt be called
551 * too many times a month ;-)
553 void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
555 /* recursively squit the servers attached to 'Current'.
556 * We're going backwards so we don't remove users
557 * while we still need them ;)
559 for (unsigned int q = 0; q < Current->ChildCount(); q++)
561 TreeServer* recursive_server = Current->GetChild(q);
562 this->SquitServer(from,recursive_server);
564 /* Now we've whacked the kids, whack self */
566 num_lost_users += Current->QuitUsers(from);
569 /** This is a wrapper function for SquitServer above, which
570 * does some validation first and passes on the SQUIT to all
571 * other remaining servers.
573 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
575 if ((Current) && (Current != Utils->TreeRoot))
577 Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
578 rmode.Send(Instance);
580 std::deque<std::string> params;
581 params.push_back(Current->GetName());
582 params.push_back(":"+reason);
583 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
584 if (Current->GetParent() == Utils->TreeRoot)
586 this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split: "+reason);
590 this->Instance->SNO->WriteToSnoMask('l',"Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
592 num_lost_servers = 0;
594 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
595 SquitServer(from, Current);
597 Current->GetParent()->DelChild(Current);
599 this->Instance->SNO->WriteToSnoMask('l',"Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
602 Instance->Log(DEFAULT,"Squit from unknown server");
605 /** FMODE command - server mode with timestamp checks */
606 bool TreeSocket::ForceMode(const std::string &source, std::deque<std::string> ¶ms)
608 /* Chances are this is a 1.0 FMODE without TS */
609 if (params.size() < 3)
611 /* No modes were in the command, probably a channel with no modes set on it */
616 std::string sourceserv;
617 /* Are we dealing with an FMODE from a user, or from a server? */
618 userrec* who = this->Instance->FindNick(source);
621 /* FMODE from a user, set sourceserv to the users server name */
622 sourceserv = who->server;
626 /* FMODE from a server, create a fake user to receive mode feedback */
627 who = new userrec(this->Instance);
628 who->SetFd(FD_MAGIC_NUMBER);
629 smode = true; /* Setting this flag tells us we should free the userrec later */
630 sourceserv = source; /* Set sourceserv to the actual source string */
632 const char* modelist[64];
635 memset(&modelist,0,sizeof(modelist));
636 for (unsigned int q = 0; (q < params.size()) && (q < 64); q++)
640 /* The timestamp is in this position.
641 * We don't want to pass that up to the
642 * server->client protocol!
644 TS = atoi(params[q].c_str());
648 /* Everything else is fine to append to the modelist */
649 modelist[n++] = params[q].c_str();
653 /* Extract the TS value of the object, either userrec or chanrec */
654 userrec* dst = this->Instance->FindNick(params[0]);
655 chanrec* chan = NULL;
663 chan = this->Instance->FindChan(params[0]);
669 /* Oops, channel doesnt exist! */
673 /* TS is equal or less: Merge the mode changes into ours and pass on.
677 if ((TS < ourTS) && (!dst))
678 Instance->Log(DEFAULT,"*** BUG *** Channel TS sent in FMODE to %s is %lu which is not equal to %lu!", params[0].c_str(), TS, ourTS);
682 this->Instance->SendMode(modelist, n, who);
686 this->Instance->CallCommandHandler("MODE", modelist, n, who);
688 /* HOT POTATO! PASS IT ON! */
689 Utils->DoOneToAllButSender(source,"FMODE",params,sourceserv);
691 /* If the TS is greater than ours, we drop the mode and dont pass it anywhere.
700 /** FTOPIC command */
701 bool TreeSocket::ForceTopic(const std::string &source, std::deque<std::string> ¶ms)
703 if (params.size() != 4)
705 time_t ts = atoi(params[1].c_str());
706 std::string nsource = source;
707 chanrec* c = this->Instance->FindChan(params[0]);
710 if ((ts >= c->topicset) || (!*c->topic))
712 std::string oldtopic = c->topic;
713 strlcpy(c->topic,params[3].c_str(),MAXTOPIC);
714 strlcpy(c->setby,params[2].c_str(),127);
716 /* if the topic text is the same as the current topic,
717 * dont bother to send the TOPIC command out, just silently
718 * update the set time and set nick.
720 if (oldtopic != params[3])
722 userrec* user = this->Instance->FindNick(source);
725 c->WriteChannelWithServ(Instance->Config->ServerName, "TOPIC %s :%s", c->name, c->topic);
729 c->WriteChannel(user, "TOPIC %s :%s", c->name, c->topic);
730 nsource = user->server;
732 /* all done, send it on its way */
733 params[3] = ":" + params[3];
734 Utils->DoOneToAllButSender(source,"FTOPIC",params,nsource);
742 /** FJOIN, similar to TS6 SJOIN, but not quite. */
743 bool TreeSocket::ForceJoin(const std::string &source, std::deque<std::string> ¶ms)
745 /* 1.1 FJOIN works as follows:
747 * Each FJOIN is sent along with a timestamp, and the side with the lowest
748 * timestamp 'wins'. From this point on we will refer to this side as the
749 * winner. The side with the higher timestamp loses, from this point on we
750 * will call this side the loser or losing side. This should be familiar to
751 * anyone who's dealt with dreamforge or TS6 before.
753 * When two sides of a split heal and this occurs, the following things
756 * If the timestamps are exactly equal, both sides merge their privilages
757 * and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
758 * re-created during a split, this is safe to do.
760 * If the timestamps are NOT equal, the losing side removes all of its
761 * modes from the channel, before introducing new users into the channel
762 * which are listed in the FJOIN command's parameters. The losing side then
763 * LOWERS its timestamp value of the channel to match that of the winning
764 * side, and the modes of the users of the winning side are merged in with
767 * The winning side on the other hand will ignore all user modes from the
768 * losing side, so only its own modes get applied. Life is simple for those
769 * who succeed at internets. :-)
771 * NOTE: Unlike TS6 and dreamforge and other protocols which have SJOIN,
772 * FJOIN does not contain the simple-modes such as +iklmnsp. Why not,
773 * you ask? Well, quite simply because we don't need to. They'll be sent
774 * after the FJOIN by FMODE, and FMODE is timestamped, so in the event
775 * the losing side sends any modes for the channel which shouldnt win,
776 * they wont as their timestamp will be too high :-)
779 if (params.size() < 3)
782 irc::modestacker modestack(true); /* Modes to apply from the users in the user list */
783 userrec* who = NULL; /* User we are currently checking */
784 std::string channel = params[0]; /* Channel name, as a string */
785 time_t TS = atoi(params[1].c_str()); /* Timestamp given to us for remote side */
786 irc::tokenstream users(params[2]); /* Users from the user list */
787 bool apply_other_sides_modes = true; /* True if we are accepting the other side's modes */
788 chanrec* chan = this->Instance->FindChan(channel); /* The channel we're sending joins to */
789 time_t ourTS = chan ? chan->age : Instance->Time(true)+600; /* The TS of our side of the link */
790 bool created = !chan; /* True if the channel doesnt exist here yet */
791 std::string item; /* One item in the list of nicks */
793 params[2] = ":" + params[2];
794 Utils->DoOneToAllButSender(source,"FJOIN",params,source);
796 /* If our TS is less than theirs, we dont accept their modes */
798 apply_other_sides_modes = false;
800 /* Our TS greater than theirs, clear all our modes from the channel, accept theirs. */
803 std::deque<std::string> param_list;
804 if (Utils->AnnounceTSChange && chan)
805 chan->WriteChannelWithServ(Instance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name, chan->name, ourTS, TS);
810 param_list.push_back(channel);
811 this->RemoveStatus(Instance->Config->ServerName, param_list);
815 /* Now, process every 'prefixes,nick' pair */
816 while (users.GetToken(item))
818 const char* usr = item.c_str();
821 const char* permissions = usr;
822 /* Iterate through all the prefix values, convert them from prefixes to mode letters */
824 while ((*permissions) && (*permissions != ','))
826 ModeHandler* mh = Instance->Modes->FindPrefix(*permissions);
828 modes = modes + mh->GetModeChar();
831 this->SendError(std::string("Invalid prefix '")+(*permissions)+"' in FJOIN");
837 /* Advance past the comma, to the nick */
840 /* Check the user actually exists */
841 who = this->Instance->FindNick(usr);
844 /* Check that the user's 'direction' is correct */
845 TreeServer* route_back_again = Utils->BestRouteTo(who->server);
846 if ((!route_back_again) || (route_back_again->GetSocket() != this))
849 /* Add any permissions this user had to the mode stack */
850 for (std::string::iterator x = modes.begin(); x != modes.end(); ++x)
851 modestack.Push(*x, who->nick);
853 chanrec::JoinUser(this->Instance, who, channel.c_str(), true, "", TS);
857 Instance->Log(SPARSE,"Warning! Invalid user %s in FJOIN to channel %s IGNORED", usr, channel.c_str());
863 /* Flush mode stacker if we lost the FJOIN or had equal TS */
864 if (apply_other_sides_modes)
866 std::deque<std::string> stackresult;
867 const char* mode_junk[MAXMODES+1];
868 userrec* n = new userrec(Instance);
869 n->SetFd(FD_MAGIC_NUMBER);
870 mode_junk[0] = channel.c_str();
872 while (modestack.GetStackedLine(stackresult))
874 for (size_t j = 0; j < stackresult.size(); j++)
876 mode_junk[j+1] = stackresult[j].c_str();
878 Instance->SendMode(mode_junk, stackresult.size() + 1, n);
888 bool TreeSocket::IntroduceClient(const std::string &source, std::deque<std::string> ¶ms)
890 /** Do we have enough parameters:
891 * NICK age nick host dhost ident +modes ip :gecos
893 if (params.size() != 8)
895 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction ("+params[1]+"?)");
899 time_t age = ConvToInt(params[0]);
900 const char* tempnick = params[1].c_str();
902 cmd_validation valid[] = { {"Nickname", 1, NICKMAX}, {"Hostname", 2, 64}, {"Displayed hostname", 3, 64}, {"Ident", 4, IDENTMAX}, {"GECOS", 7, MAXGECOS}, {"", 0, 0} };
904 TreeServer* remoteserver = Utils->FindServer(source);
907 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Unknown server "+source+")");
911 /* Check parameters for validity before introducing the client, discovered by dmb */
914 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (Invalid TS?)");
917 for (size_t x = 0; valid[x].length; ++x)
919 if (params[valid[x].param].length() > valid[x].length)
921 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+params[1]+" :Invalid client introduction (" + valid[x].item + " > " + ConvToStr(valid[x].length) + ")");
926 /** Our client looks ok, lets introduce it now
928 Instance->Log(DEBUG,"New remote client %s",tempnick);
929 user_hash::iterator iter = this->Instance->clientlist->find(tempnick);
931 if (iter != this->Instance->clientlist->end())
934 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" KILL "+tempnick+" :Nickname collision");
935 userrec::QuitUser(this->Instance, iter->second, "Nickname collision");
939 userrec* _new = new userrec(this->Instance);
940 (*(this->Instance->clientlist))[tempnick] = _new;
941 _new->SetFd(FD_MAGIC_NUMBER);
942 strlcpy(_new->nick, tempnick,NICKMAX-1);
943 strlcpy(_new->host, params[2].c_str(),64);
944 strlcpy(_new->dhost, params[3].c_str(),64);
945 _new->server = this->Instance->FindServerNamePtr(source.c_str());
946 strlcpy(_new->ident, params[4].c_str(),IDENTMAX);
947 strlcpy(_new->fullname, params[7].c_str(),MAXGECOS);
948 _new->registered = REG_ALL;
951 /* we need to remove the + from the modestring, so we can do our stuff */
952 std::string::size_type pos_after_plus = params[5].find_first_not_of('+');
953 if (pos_after_plus != std::string::npos)
954 params[5] = params[5].substr(pos_after_plus);
956 for (std::string::iterator v = params[5].begin(); v != params[5].end(); v++)
958 _new->modes[(*v)-65] = 1;
959 /* For each mode thats set, increase counter */
960 ModeHandler* mh = Instance->Modes->FindMode(*v, MODETYPE_USER);
965 /* now we've done with modes processing, put the + back for remote servers */
966 params[5] = "+" + params[5];
968 #ifdef SUPPORT_IP6LINKS
969 if (params[6].find_first_of(":") != std::string::npos)
970 _new->SetSockAddr(AF_INET6, params[6].c_str(), 0);
973 _new->SetSockAddr(AF_INET, params[6].c_str(), 0);
975 Instance->AddGlobalClone(_new);
977 bool dosend = !(((this->Utils->quiet_bursts) && (this->bursting || Utils->FindRemoteBurstServer(remoteserver))) || (this->Instance->SilentULine(_new->server)));
980 this->Instance->SNO->WriteToSnoMask('C',"Client connecting at %s: %s!%s@%s [%s] [%s]",_new->server,_new->nick,_new->ident,_new->host, _new->GetIPString(), _new->fullname);
982 params[7] = ":" + params[7];
983 Utils->DoOneToAllButSender(source,"NICK", params, source);
985 // Increment the Source Servers User Count..
986 TreeServer* SourceServer = Utils->FindServer(source);
989 SourceServer->AddUserCount();
992 FOREACH_MOD_I(Instance,I_OnPostConnect,OnPostConnect(_new));
997 /** Send one or more FJOINs for a channel of users.
998 * If the length of a single line is more than 480-NICKMAX
999 * in length, it is split over multiple lines.
1001 void TreeSocket::SendFJoins(TreeServer* Current, chanrec* c)
1005 std::string individual_halfops = std::string(":")+this->Instance->Config->ServerName+" FMODE "+c->name+" "+ConvToStr(c->age);
1007 size_t dlen, curlen;
1008 dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
1010 char* ptr = list + dlen;
1012 CUList *ulist = c->GetUsers();
1016 for (CUList::iterator i = ulist->begin(); i != ulist->end(); i++)
1018 // The first parameter gets a : before it
1019 size_t ptrlen = snprintf(ptr, MAXBUF, " %s%s,%s", !numusers ? ":" : "", c->GetAllPrefixChars(i->first), i->first->nick);
1026 if (curlen > (480-NICKMAX))
1028 buffer.append(list).append("\r\n");
1029 dlen = curlen = snprintf(list,MAXBUF,":%s FJOIN %s %lu",this->Instance->Config->ServerName,c->name,(unsigned long)c->age);
1037 buffer.append(list).append("\r\n");
1039 buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(c->ChanModes(true)).append("\r\n");
1042 for (BanList::iterator b = c->bans.begin(); b != c->bans.end(); b++)
1044 int size = strlen(b->data) + 2;
1045 int currsize = linesize + size;
1046 if (currsize <= 350)
1049 params.append(" ").append(b->data);
1052 if ((params.length() >= MAXMODES) || (currsize > 350))
1054 /* Wrap at MAXMODES */
1055 buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params).append("\r\n");
1062 /* Only send these if there are any */
1064 buffer.append(":").append(this->Instance->Config->ServerName).append(" FMODE ").append(c->name).append(" ").append(ConvToStr(c->age)).append(" +").append(modes).append(params);
1066 this->WriteLine(buffer);
1069 /** Send G, Q, Z and E lines */
1070 void TreeSocket::SendXLines(TreeServer* Current)
1074 std::string n = this->Instance->Config->ServerName;
1075 const char* sn = n.c_str();
1076 /* Yes, these arent too nice looking, but they get the job done */
1077 for (std::vector<ZLine*>::iterator i = Instance->XLines->zlines.begin(); i != Instance->XLines->zlines.end(); i++)
1079 snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1080 buffer.append(data);
1082 for (std::vector<QLine*>::iterator i = Instance->XLines->qlines.begin(); i != Instance->XLines->qlines.end(); i++)
1084 snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1085 buffer.append(data);
1087 for (std::vector<GLine*>::iterator i = Instance->XLines->glines.begin(); i != Instance->XLines->glines.end(); i++)
1089 snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1090 buffer.append(data);
1092 for (std::vector<ELine*>::iterator i = Instance->XLines->elines.begin(); i != Instance->XLines->elines.end(); i++)
1094 snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1095 buffer.append(data);
1097 for (std::vector<ZLine*>::iterator i = Instance->XLines->pzlines.begin(); i != Instance->XLines->pzlines.end(); i++)
1099 snprintf(data,MAXBUF,":%s ADDLINE Z %s %s %lu %lu :%s\r\n",sn,(*i)->ipaddr,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1100 buffer.append(data);
1102 for (std::vector<QLine*>::iterator i = Instance->XLines->pqlines.begin(); i != Instance->XLines->pqlines.end(); i++)
1104 snprintf(data,MAXBUF,":%s ADDLINE Q %s %s %lu %lu :%s\r\n",sn,(*i)->nick,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1105 buffer.append(data);
1107 for (std::vector<GLine*>::iterator i = Instance->XLines->pglines.begin(); i != Instance->XLines->pglines.end(); i++)
1109 snprintf(data,MAXBUF,":%s ADDLINE G %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1110 buffer.append(data);
1112 for (std::vector<ELine*>::iterator i = Instance->XLines->pelines.begin(); i != Instance->XLines->pelines.end(); i++)
1114 snprintf(data,MAXBUF,":%s ADDLINE E %s@%s %s %lu %lu :%s\r\n",sn,(*i)->identmask,(*i)->hostmask,(*i)->source,(unsigned long)(*i)->set_time,(unsigned long)(*i)->duration,(*i)->reason);
1115 buffer.append(data);
1118 if (!buffer.empty())
1119 this->WriteLine(buffer);
1122 /** Send channel modes and topics */
1123 void TreeSocket::SendChannelModes(TreeServer* Current)
1126 std::deque<std::string> list;
1127 std::string n = this->Instance->Config->ServerName;
1128 const char* sn = n.c_str();
1129 Instance->Log(DEBUG,"Sending channels and modes, %d to send", this->Instance->chanlist->size());
1130 for (chan_hash::iterator c = this->Instance->chanlist->begin(); c != this->Instance->chanlist->end(); c++)
1132 SendFJoins(Current, c->second);
1133 if (*c->second->topic)
1135 snprintf(data,MAXBUF,":%s FTOPIC %s %lu %s :%s",sn,c->second->name,(unsigned long)c->second->topicset,c->second->setby,c->second->topic);
1136 this->WriteLine(data);
1138 FOREACH_MOD_I(this->Instance,I_OnSyncChannel,OnSyncChannel(c->second,(Module*)Utils->Creator,(void*)this));
1140 c->second->GetExtList(list);
1141 for (unsigned int j = 0; j < list.size(); j++)
1143 FOREACH_MOD_I(this->Instance,I_OnSyncChannelMetaData,OnSyncChannelMetaData(c->second,(Module*)Utils->Creator,(void*)this,list[j]));
1148 /** send all users and their oper state/modes */
1149 void TreeSocket::SendUsers(TreeServer* Current)
1152 std::deque<std::string> list;
1153 std::string dataline;
1154 for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++)
1156 if (u->second->registered == REG_ALL)
1158 snprintf(data,MAXBUF,":%s NICK %lu %s %s %s %s +%s %s :%s",u->second->server,(unsigned long)u->second->age,u->second->nick,u->second->host,u->second->dhost,u->second->ident,u->second->FormatModes(),u->second->GetIPString(),u->second->fullname);
1159 this->WriteLine(data);
1160 if (*u->second->oper)
1162 snprintf(data,MAXBUF,":%s OPERTYPE %s", u->second->nick, u->second->oper);
1163 this->WriteLine(data);
1165 if (*u->second->awaymsg)
1167 snprintf(data,MAXBUF,":%s AWAY :%s", u->second->nick, u->second->awaymsg);
1168 this->WriteLine(data);
1172 for (user_hash::iterator u = this->Instance->clientlist->begin(); u != this->Instance->clientlist->end(); u++)
1174 FOREACH_MOD_I(this->Instance,I_OnSyncUser,OnSyncUser(u->second,(Module*)Utils->Creator,(void*)this));
1176 u->second->GetExtList(list);
1177 for (unsigned int j = 0; j < list.size(); j++)
1179 FOREACH_MOD_I(this->Instance,I_OnSyncUserMetaData,OnSyncUserMetaData(u->second,(Module*)Utils->Creator,(void*)this,list[j]));
1184 /** This function is called when we want to send a netburst to a local
1185 * server. There is a set order we must do this, because for example
1186 * users require their servers to exist, and channels require their
1187 * users to exist. You get the idea.
1189 void TreeSocket::DoBurst(TreeServer* s)
1191 std::string name = s->GetName();
1192 std::string burst = "BURST "+ConvToStr(Instance->Time(true));
1193 std::string endburst = "ENDBURST";
1194 this->Instance->SNO->WriteToSnoMask('l',"Bursting to \2%s\2 (Authentication: %s).", name.c_str(), this->GetTheirChallenge().empty() ? "plaintext password" : "SHA256-HMAC challenge-response");
1195 this->WriteLine(burst);
1196 /* send our version string */
1197 this->WriteLine(std::string(":")+this->Instance->Config->ServerName+" VERSION :"+this->Instance->GetVersionString());
1198 /* Send server tree */
1199 this->SendServers(Utils->TreeRoot,s,1);
1200 /* Send users and their oper status */
1202 /* Send everything else (channel modes, xlines etc) */
1203 this->SendChannelModes(s);
1204 this->SendXLines(s);
1205 FOREACH_MOD_I(this->Instance,I_OnSyncOtherMetaData,OnSyncOtherMetaData((Module*)Utils->Creator,(void*)this));
1206 this->WriteLine(endburst);
1207 this->Instance->SNO->WriteToSnoMask('l',"Finished bursting to \2"+name+"\2.");
1210 /** This function is called when we receive data from a remote
1211 * server. We buffer the data in a std::string (it doesnt stay
1212 * there for long), reading using InspSocket::Read() which can
1213 * read up to 16 kilobytes in one operation.
1215 * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
1216 * THE SOCKET OBJECT FOR US.
1218 bool TreeSocket::OnDataReady()
1220 char* data = this->Read();
1221 /* Check that the data read is a valid pointer and it has some content */
1224 this->in_buffer.append(data);
1225 /* While there is at least one new line in the buffer,
1226 * do something useful (we hope!) with it.
1228 while (in_buffer.find("\n") != std::string::npos)
1230 std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
1231 in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
1232 /* Use rfind here not find, as theres more
1233 * chance of the \r being near the end of the
1234 * string, not the start.
1236 if (ret.find("\r") != std::string::npos)
1237 ret = in_buffer.substr(0,in_buffer.find("\r")-1);
1238 /* Process this one, abort if it
1239 * didnt return true.
1241 if (!this->ProcessLine(ret))
1248 /* EAGAIN returns an empty but non-NULL string, so this
1249 * evaluates to TRUE for EAGAIN but to FALSE for EOF.
1251 return (data && !*data);