src/modules/m_spanningtree/resolvers.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 "commands/cmd_whois.h"
  16 #include "commands/cmd_stats.h"
  17 #include "socket.h"
  18 #include "xline.h"
  19 #include "../transport.h"
  20
  21 #include "resolvers.h"
  22 #include "main.h"
  23 #include "utils.h"
  24 #include "treeserver.h"
  25 #include "link.h"
  26 #include "treesocket.h"
  27
  28 /* $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 */
  29
  30 /** This class is used to resolve server hostnames during /connect and autoconnect.
  31  * As of 1.1, the resolver system is seperated out from BufferedSocket, so we must do this
  32  * resolver step first ourselves if we need it. This is totally nonblocking, and will
  33  * callback to OnLookupComplete or OnError when completed. Once it has completed we
  34  * will have an IP address which we can then use to continue our connection.
  35  */
  36 ServernameResolver::ServernameResolver(Module* me, SpanningTreeUtilities* Util, InspIRCd* Instance, const std::string &hostname, Link x, bool &cached, QueryType qt) : Resolver(Instance, hostname, qt, cached, me), MyLink(x), Utils(Util), query(qt), host(hostname), mine(me)
  37 {
  38         /* Nothing in here, folks */
  39 }
  40
  41 void ServernameResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  42 {
  43         /* Initiate the connection, now that we have an IP to use.
  44          * Passing a hostname directly to BufferedSocket causes it to
  45          * just bail and set its FD to -1.
  46          */
  47         TreeServer* CheckDupe = Utils->FindServer(MyLink.Name.c_str());
  48         if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
  49         {
  50
  51                 if ((!MyLink.Hook.empty()) && (Utils->hooks.find(MyLink.Hook.c_str()) ==  Utils->hooks.end()))
  52                         return;
  53
  54                 TreeSocket* newsocket = new TreeSocket(this->Utils, ServerInstance, result,MyLink.Port,MyLink.Timeout ? MyLink.Timeout : 10,MyLink.Name.c_str(),
  55                                                         MyLink.Bind, MyLink.Hook.empty() ? NULL : Utils->hooks[MyLink.Hook.c_str()]);
  56                 if (newsocket->GetFd() > -1)
  57                 {
  58                         /* We're all OK */
  59                 }
  60                 else
  61                 {
  62                         /* Something barfed, show the opers */
  63                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",MyLink.Name.c_str(),strerror(errno));
  64                         if (ServerInstance->SocketCull.find(newsocket) == ServerInstance->SocketCull.end())
  65                                 ServerInstance->SocketCull[newsocket] = newsocket;
  66                         Utils->DoFailOver(&MyLink);
  67                 }
  68         }
  69 }
  70
  71 void ServernameResolver::OnError(ResolverError e, const std::string &errormessage)
  72 {
  73         /* Ooops! */
  74         if (query == DNS_QUERY_AAAA)
  75         {
  76                 bool cached;
  77                 ServernameResolver* snr = new ServernameResolver(mine, Utils, ServerInstance, host, MyLink, cached, DNS_QUERY_A);
  78                 ServerInstance->AddResolver(snr, cached);
  79                 return;
  80         }
  81         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s", MyLink.Name.c_str(), errormessage.c_str() );
  82         Utils->DoFailOver(&MyLink);
  83 }
  84