src/modules/m_spanningtree/treesocket1.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 "socket.h"
  16 #include "xline.h"
  17 #include "../m_hash.h"
  18 #include "socketengine.h"
  19
  20 #include "main.h"
  21 #include "../spanningtree.h"
  22 #include "utils.h"
  23 #include "treeserver.h"
  24 #include "link.h"
  25 #include "treesocket.h"
  26 #include "resolvers.h"
  27
  28 /** Because most of the I/O gubbins are encapsulated within
  29  * BufferedSocket, we just call the superclass constructor for
  30  * most of the action, and append a few of our own values
  31  * to it.
  32  */
  33 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, const std::string& shost, int iport, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Autoconnect* myac, const std::string& hook)
  34         : Utils(Util), IP(shost), myautoconnect(myac)
  35 {
  36         age = ServerInstance->Time();
  37         myhost = ServerName;
  38         capab_phase = 0;
  39         proto_version = 0;
  40         LinkState = CONNECTING;
  41         if (!hook.empty())
  42         {
  43                 modulelist* ml = ServerInstance->Modules->FindInterface("BufferedSocketHook");
  44                 if (ml)
  45                 {
  46                         for(modulelist::iterator i = ml->begin(); i != ml->end(); ++i)
  47                         {
  48                                 std::string name = (**i).ModuleSourceFile;
  49                                 int a = name.rfind('_');
  50                                 int b = name.rfind('.');
  51                                 name = name.substr(a, b-a-1);
  52                                 if (name == hook)
  53                                 {
  54                                         AddIOHook(*i);
  55                                         goto found;
  56                                 }
  57                         }
  58                 }
  59                 SetError("Could not find hook '" + hook + "' for connection to " + ServerName);
  60                 return;
  61         }
  62 found:
  63         DoConnect(shost, iport, maxtime, bindto);
  64         Utils->timeoutlist[this] = std::pair<std::string, int>(ServerName, maxtime);
  65         SendCapabilities(1);
  66 }
  67
  68 /** When a listening socket gives us a new file descriptor,
  69  * we must associate it with a socket without creating a new
  70  * connection. This constructor is used for this purpose.
  71  */
  72 TreeSocket::TreeSocket(SpanningTreeUtilities* Util, int newfd, ListenSocketBase* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
  73         : BufferedSocket(newfd), Utils(Util)
  74 {
  75         int dummy;
  76         irc::sockets::satoap(client, IP, dummy);
  77         age = ServerInstance->Time();
  78         LinkState = WAIT_AUTH_1;
  79         capab_phase = 0;
  80         proto_version = 0;
  81
  82         FOREACH_MOD(I_OnHookIO, OnHookIO(this, via));
  83         if (GetIOHook())
  84                 GetIOHook()->OnStreamSocketAccept(this, client, server);
  85         SendCapabilities(1);
  86
  87         /* Fix by Brain - inbound sockets need a timeout, too. 30 secs should be pleanty */
  88         Utils->timeoutlist[this] = std::pair<std::string, int>("<from " + IP + ">", 30);
  89 }
  90
  91 ServerState TreeSocket::GetLinkState()
  92 {
  93         return this->LinkState;
  94 }
  95
  96 void TreeSocket::CleanNegotiationInfo()
  97 {
  98         ModuleList.clear();
  99         OptModuleList.clear();
 100         CapKeys.clear();
 101         ourchallenge.clear();
 102         theirchallenge.clear();
 103         OutboundPass.clear();
 104 }
 105
 106 bool TreeSocket::cull()
 107 {
 108         Utils->timeoutlist.erase(this);
 109         return this->BufferedSocket::cull();
 110 }
 111
 112 TreeSocket::~TreeSocket()
 113 {
 114 }
 115
 116 /** When an outbound connection finishes connecting, we receive
 117  * this event, and must send our SERVER string to the other
 118  * side. If the other side is happy, as outlined in the server
 119  * to server docs on the inspircd.org site, the other side
 120  * will then send back its own server string.
 121  */
 122 void TreeSocket::OnConnected()
 123 {
 124         if (this->LinkState == CONNECTING)
 125         {
 126                 /* we do not need to change state here. */
 127                 for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i < Utils->LinkBlocks.end(); ++i)
 128                 {
 129                         Link* x = *i;
 130                         if (x->Name == this->myhost)
 131                         {
 132                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->IP.c_str()));
 133                                 this->OutboundPass = x->SendPass;
 134                                 this->SendCapabilities(1);
 135                                 return;
 136                         }
 137                 }
 138         }
 139         /* There is a (remote) chance that between the /CONNECT and the connection
 140          * being accepted, some muppet has removed the <link> block and rehashed.
 141          * If that happens the connection hangs here until it's closed. Unlikely
 142          * and rather harmless.
 143          */
 144         ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str());
 145 }
 146
 147 void TreeSocket::OnError(BufferedSocketError e)
 148 {
 149         switch (e)
 150         {
 151                 case I_ERR_CONNECT:
 152                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Connection to \002%s\002 refused", myhost.c_str());
 153                         Utils->Creator->ConnectServer(myautoconnect);
 154                 break;
 155                 case I_ERR_SOCKET:
 156                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Could not create socket (%s)", strerror(errno));
 157                 break;
 158                 case I_ERR_BIND:
 159                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Error binding socket to address or port (%s)", strerror(errno));
 160                 break;
 161                 case I_ERR_WRITE:
 162                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly");
 163                 break;
 164                 case I_ERR_NOMOREFDS:
 165                         ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Operating system is out of file descriptors!");
 166                 break;
 167                 default:
 168                         if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
 169                                 ServerInstance->SNO->WriteToSnoMask('l', "Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno));
 170                 break;
 171         }
 172 }
 173
 174 void TreeSocket::SendError(const std::string &errormessage)
 175 {
 176         /* Display the error locally as well as sending it remotely */
 177         ServerInstance->SNO->WriteToSnoMask('l', "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->IP.c_str() : this->InboundServerName.c_str()), errormessage.c_str());
 178         WriteLine("ERROR :"+errormessage);
 179         SetError(errormessage);
 180 }
 181
 182 /** This function forces this server to quit, removing this server
 183  * and any users on it (and servers and users below that, etc etc).
 184  * It's very slow and pretty clunky, but luckily unless your network
 185  * is having a REAL bad hair day, this function shouldnt be called
 186  * too many times a month ;-)
 187  */
 188 void TreeSocket::SquitServer(std::string &from, TreeServer* Current)
 189 {
 190         ServerInstance->Logs->Log("m_spanningtree",DEBUG,"SquitServer for %s from %s",
 191                 Current->GetName().c_str(), from.c_str());
 192         /* recursively squit the servers attached to 'Current'.
 193          * We're going backwards so we don't remove users
 194          * while we still need them ;)
 195          */
 196         for (unsigned int q = 0; q < Current->ChildCount(); q++)
 197         {
 198                 TreeServer* recursive_server = Current->GetChild(q);
 199                 this->SquitServer(from,recursive_server);
 200         }
 201         /* Now we've whacked the kids, whack self */
 202         num_lost_servers++;
 203         num_lost_users += Current->QuitUsers(from);
 204 }
 205
 206 /** This is a wrapper function for SquitServer above, which
 207  * does some validation first and passes on the SQUIT to all
 208  * other remaining servers.
 209  */
 210 void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
 211 {
 212         bool LocalSquit = false;
 213
 214         if ((Current) && (Current != Utils->TreeRoot))
 215         {
 216                 DelServerEvent(Utils->Creator, Current->GetName());
 217
 218                 parameterlist params;
 219                 params.push_back(Current->GetName());
 220                 params.push_back(":"+reason);
 221                 Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
 222                 if (Current->GetParent() == Utils->TreeRoot)
 223                 {
 224                         ServerInstance->SNO->WriteToSnoMask('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
 225                         LocalSquit = true;
 226                 }
 227                 else
 228                 {
 229                         ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
 230                 }
 231                 num_lost_servers = 0;
 232                 num_lost_users = 0;
 233                 std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
 234                 SquitServer(from, Current);
 235                 Current->Tidy();
 236                 Current->GetParent()->DelChild(Current);
 237                 delete Current;
 238                 if (LocalSquit)
 239                         ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 240                 else
 241                         ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
 242         }
 243         else
 244                 ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
 245 }
 246
 247 /** This function is called when we receive data from a remote
 248  * server.
 249  */
 250 void TreeSocket::OnDataReady()
 251 {
 252         Utils->Creator->loopCall = true;
 253         /* While there is at least one new line in the buffer,
 254          * do something useful (we hope!) with it.
 255          */
 256         while (recvq.find("\n") != std::string::npos)
 257         {
 258                 std::string ret = recvq.substr(0,recvq.find("\n")-1);
 259                 recvq = recvq.substr(recvq.find("\n")+1,recvq.length()-recvq.find("\n"));
 260                 /* Use rfind here not find, as theres more
 261                  * chance of the \r being near the end of the
 262                  * string, not the start.
 263                  */
 264                 if (ret.find("\r") != std::string::npos)
 265                         ret = recvq.substr(0,recvq.find("\r")-1);
 266                 ProcessLine(ret);
 267         }
 268         Utils->Creator->loopCall = false;
 269 }