/* +------------------------------------+ * | Inspire Internet Relay Chat Daemon | * +------------------------------------+ * * InspIRCd: (C) 2002-2008 InspIRCd Development Team * See: http://www.inspircd.org/wiki/index.php/Credits * * This program is free but copyrighted software; see * the file COPYING for details. * * --------------------------------------------------- */ #include "inspircd.h" #include "commands/cmd_whois.h" #include "commands/cmd_stats.h" #include "socket.h" #include "xline.h" #include "transport.h" #include "m_hash.h" #include "socketengine.h" #include "m_spanningtree/main.h" #include "m_spanningtree/utils.h" #include "m_spanningtree/treeserver.h" #include "m_spanningtree/link.h" #include "m_spanningtree/treesocket.h" #include "m_spanningtree/resolvers.h" #include "m_spanningtree/handshaketimer.h" /* $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_hash.h m_spanningtree/handshaketimer.h */ /** Because most of the I/O gubbins are encapsulated within * BufferedSocket, we just call the superclass constructor for * most of the action, and append a few of our own values * to it. */ TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, std::string shost, int iport, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod) : BufferedSocket(SI, shost, iport, maxtime, bindto), Utils(Util), Hook(HookMod) { myhost = ServerName; theirchallenge.clear(); ourchallenge.clear(); this->LinkState = CONNECTING; Utils->timeoutlist[this] = std::pair(ServerName, maxtime); if (Hook) BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send(); } /** When a listening socket gives us a new file descriptor, * we must associate it with a socket without creating a new * connection. This constructor is used for this purpose. */ TreeSocket::TreeSocket(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod) : BufferedSocket(SI, newfd, ip), Utils(Util), Hook(HookMod) { this->LinkState = WAIT_AUTH_1; theirchallenge.clear(); ourchallenge.clear(); sentcapab = false; /* If we have a transport module hooked to the parent, hook the same module to this * socket, and set a timer waiting for handshake before we send CAPAB etc. */ if (Hook) BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send(); ServerInstance->Timers->AddTimer(new HandshakeTimer(ServerInstance, this, &(Utils->LinkBlocks[0]), this->Utils, 1)); /* Fix by Brain - inbound sockets need a timeout, too. 30 secs should be pleanty */ Utils->timeoutlist[this] = std::pair("", 30); } ServerState TreeSocket::GetLinkState() { return this->LinkState; } Module* TreeSocket::GetHook() { return this->Hook; } TreeSocket::~TreeSocket() { if (Hook) BufferedSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send(); Utils->timeoutlist.erase(this); } /** When an outbound connection finishes connecting, we receive * this event, and must send our SERVER string to the other * side. If the other side is happy, as outlined in the server * to server docs on the inspircd.org site, the other side * will then send back its own server string. */ bool TreeSocket::OnConnected() { if (this->LinkState == CONNECTING) { /* we do not need to change state here. */ for (std::vector::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++) { if (x->Name == this->myhost) { ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "" : this->GetIP().c_str())); if (Hook) { BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send(); ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] using transport \2%s\2", myhost.c_str(), (x->HiddenFromStats ? "" : this->GetIP().c_str()), x->Hook.c_str()); } this->OutboundPass = x->SendPass; sentcapab = false; /* found who we're supposed to be connecting to, send the neccessary gubbins. */ if (this->GetHook()) ServerInstance->Timers->AddTimer(new HandshakeTimer(ServerInstance, this, &(*x), this->Utils, 1)); else this->SendCapabilities(); return true; } } } /* There is a (remote) chance that between the /CONNECT and the connection * being accepted, some muppet has removed the block and rehashed. * If that happens the connection hangs here until it's closed. Unlikely * and rather harmless. */ ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str()); return true; } void TreeSocket::OnError(BufferedSocketError e) { Link* MyLink; switch (e) { case I_ERR_CONNECT: ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Connection to \002%s\002 refused", myhost.c_str()); MyLink = Utils->FindLink(myhost); if (MyLink) Utils->DoFailOver(MyLink); break; case I_ERR_SOCKET: ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Could not create socket (%s)", strerror(errno)); break; case I_ERR_BIND: ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Error binding socket to address or port (%s)", strerror(errno)); break; case I_ERR_WRITE: ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly"); break; case I_ERR_NOMOREFDS: ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Operating system is out of file descriptors!"); break; default: if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN)) ServerInstance->SNO->WriteToSnoMask('l', "Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno)); break; } } int TreeSocket::OnDisconnect() { /* For the same reason as above, we don't * handle OnDisconnect() */ return true; } void TreeSocket::SendError(const std::string &errormessage) { /* Display the error locally as well as sending it remotely */ ServerInstance->SNO->WriteToSnoMask('l', "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->GetIP().c_str() : this->InboundServerName.c_str()), errormessage.c_str()); this->WriteLine("ERROR :"+errormessage); /* One last attempt to make sure the error reaches its target */ this->FlushWriteBuffer(); } /** This function forces this server to quit, removing this server * and any users on it (and servers and users below that, etc etc). * It's very slow and pretty clunky, but luckily unless your network * is having a REAL bad hair day, this function shouldnt be called * too many times a month ;-) */ void TreeSocket::SquitServer(std::string &from, TreeServer* Current) { /* recursively squit the servers attached to 'Current'. * We're going backwards so we don't remove users * while we still need them ;) */ for (unsigned int q = 0; q < Current->ChildCount(); q++) { TreeServer* recursive_server = Current->GetChild(q); this->SquitServer(from,recursive_server); } /* Now we've whacked the kids, whack self */ num_lost_servers++; num_lost_users += Current->QuitUsers(from); } /** This is a wrapper function for SquitServer above, which * does some validation first and passes on the SQUIT to all * other remaining servers. */ void TreeSocket::Squit(TreeServer* Current, const std::string &reason) { bool LocalSquit = false; if ((Current) && (Current != Utils->TreeRoot)) { Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server"); rmode.Send(ServerInstance); std::deque params; params.push_back(Current->GetName()); params.push_back(":"+reason); Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName()); if (Current->GetParent() == Utils->TreeRoot) { this->ServerInstance->SNO->WriteToSnoMask('l', "Server \002"+Current->GetName()+"\002 split: "+reason); LocalSquit = true; } else { this->ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason); } num_lost_servers = 0; num_lost_users = 0; std::string from = Current->GetParent()->GetName()+" "+Current->GetName(); SquitServer(from, Current); Current->Tidy(); Current->GetParent()->DelChild(Current); delete Current; if (LocalSquit) this->ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers); else this->ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers); } else ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server"); } /** This function is called when we receive data from a remote * server. We buffer the data in a std::string (it doesnt stay * there for long), reading using BufferedSocket::Read() which can * read up to 16 kilobytes in one operation. * * IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES * THE SOCKET OBJECT FOR US. */ bool TreeSocket::OnDataReady() { const char* data = this->Read(); /* Check that the data read is a valid pointer and it has some content */ if (data && *data) { this->in_buffer.append(data); /* While there is at least one new line in the buffer, * do something useful (we hope!) with it. */ while (in_buffer.find("\n") != std::string::npos) { std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1); in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n")); /* Use rfind here not find, as theres more * chance of the \r being near the end of the * string, not the start. */ if (ret.find("\r") != std::string::npos) ret = in_buffer.substr(0,in_buffer.find("\r")-1); /* Process this one, abort if it * didnt return true. */ if (!this->ProcessLine(ret)) { return false; } } return true; } /* EAGAIN returns an empty but non-NULL string, so this * evaluates to TRUE for EAGAIN but to FALSE for EOF. */ return (data && !*data); }