src/modules/m_spanningtree/resolvers.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   5  *   Copyright (C) 2007 Craig Edwards <craigedwards@brainbox.cc>
   6  *
   7  * This file is part of InspIRCd.  InspIRCd is free software: you can
   8  * redistribute it and/or modify it under the terms of the GNU General Public
   9  * License as published by the Free Software Foundation, version 2.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14  * details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include "inspircd.h"
  22 #include "socket.h"
  23 #include "xline.h"
  24
  25 #include "resolvers.h"
  26 #include "main.h"
  27 #include "utils.h"
  28 #include "treeserver.h"
  29 #include "link.h"
  30 #include "treesocket.h"
  31
  32 /* $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 */
  33
  34 /** This class is used to resolve server hostnames during /connect and autoconnect.
  35  * As of 1.1, the resolver system is seperated out from BufferedSocket, so we must do this
  36  * resolver step first ourselves if we need it. This is totally nonblocking, and will
  37  * callback to OnLookupComplete or OnError when completed. Once it has completed we
  38  * will have an IP address which we can then use to continue our connection.
  39  */
  40 ServernameResolver::ServernameResolver(SpanningTreeUtilities* Util, const std::string &hostname, Link* x, bool &cached, QueryType qt, Autoconnect* myac)
  41         : Resolver(hostname, qt, cached, Util->Creator), Utils(Util), query(qt), host(hostname), MyLink(x), myautoconnect(myac)
  42 {
  43 }
  44
  45 void ServernameResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  46 {
  47         /* Initiate the connection, now that we have an IP to use.
  48          * Passing a hostname directly to BufferedSocket causes it to
  49          * just bail and set its FD to -1.
  50          */
  51         TreeServer* CheckDupe = Utils->FindServer(MyLink->Name.c_str());
  52         if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
  53         {
  54                 TreeSocket* newsocket = new TreeSocket(Utils, MyLink, myautoconnect, result);
  55                 if (newsocket->GetFd() > -1)
  56                 {
  57                         /* We're all OK */
  58                 }
  59                 else
  60                 {
  61                         /* Something barfed, show the opers */
  62                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",
  63                                 MyLink->Name.c_str(), newsocket->getError().c_str());
  64                         ServerInstance->GlobalCulls.AddItem(newsocket);
  65                 }
  66         }
  67 }
  68
  69 void ServernameResolver::OnError(ResolverError e, const std::string &errormessage)
  70 {
  71         /* Ooops! */
  72         if (query == DNS_QUERY_AAAA)
  73         {
  74                 bool cached = false;
  75                 ServernameResolver* snr = new ServernameResolver(Utils, host, MyLink, cached, DNS_QUERY_A, myautoconnect);
  76                 ServerInstance->AddResolver(snr, cached);
  77                 return;
  78         }
  79         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s", MyLink->Name.c_str(), errormessage.c_str() );
  80         Utils->Creator->ConnectServer(myautoconnect, false);
  81 }
  82
  83 SecurityIPResolver::SecurityIPResolver(Module* me, SpanningTreeUtilities* U, const std::string &hostname, Link* x, bool &cached, QueryType qt)
  84                 : Resolver(hostname, qt, cached, me), MyLink(x), Utils(U), mine(me), host(hostname), query(qt)
  85 {
  86 }
  87
  88 void SecurityIPResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  89 {
  90         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i != Utils->LinkBlocks.end(); ++i)
  91         {
  92                 Link* L = *i;
  93                 if (L->IPAddr == host)
  94                 {
  95                         Utils->ValidIPs.push_back(result);
  96                         break;
  97                 }
  98         }
  99 }
 100
 101 void SecurityIPResolver::OnError(ResolverError e, const std::string &errormessage)
 102 {
 103         if (query == DNS_QUERY_AAAA)
 104         {
 105                 bool cached = false;
 106                 SecurityIPResolver* res = new SecurityIPResolver(mine, Utils, host, MyLink, cached, DNS_QUERY_A);
 107                 ServerInstance->AddResolver(res, cached);
 108                 return;
 109         }
 110         ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Could not resolve IP associated with Link '%s': %s",
 111                 MyLink->Name.c_str(),errormessage.c_str());
 112 }