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
  23 #include "resolvers.h"
  24 #include "main.h"
  25 #include "utils.h"
  26 #include "treeserver.h"
  27 #include "link.h"
  28 #include "treesocket.h"
  29
  30 /* $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 */
  31
  32 /** This class is used to resolve server hostnames during /connect and autoconnect.
  33  * As of 1.1, the resolver system is seperated out from BufferedSocket, so we must do this
  34  * resolver step first ourselves if we need it. This is totally nonblocking, and will
  35  * callback to OnLookupComplete or OnError when completed. Once it has completed we
  36  * will have an IP address which we can then use to continue our connection.
  37  */
  38 ServernameResolver::ServernameResolver(SpanningTreeUtilities* Util, const std::string &hostname, Link* x, bool &cached, QueryType qt, Autoconnect* myac)
  39         : Resolver(hostname, qt, cached, Util->Creator), Utils(Util), query(qt), host(hostname), MyLink(x), myautoconnect(myac)
  40 {
  41 }
  42
  43 void ServernameResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  44 {
  45         /* Initiate the connection, now that we have an IP to use.
  46          * Passing a hostname directly to BufferedSocket causes it to
  47          * just bail and set its FD to -1.
  48          */
  49         TreeServer* CheckDupe = Utils->FindServer(MyLink->Name.c_str());
  50         if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
  51         {
  52                 TreeSocket* newsocket = new TreeSocket(Utils, MyLink, myautoconnect, result);
  53                 if (newsocket->GetFd() > -1)
  54                 {
  55                         /* We're all OK */
  56                 }
  57                 else
  58                 {
  59                         /* Something barfed, show the opers */
  60                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",
  61                                 MyLink->Name.c_str(), newsocket->getError().c_str());
  62                         ServerInstance->GlobalCulls.AddItem(newsocket);
  63                 }
  64         }
  65 }
  66
  67 void ServernameResolver::OnError(ResolverError e, const std::string &errormessage)
  68 {
  69         /* Ooops! */
  70         if (query == DNS_QUERY_AAAA)
  71         {
  72                 bool cached = false;
  73                 ServernameResolver* snr = new ServernameResolver(Utils, host, MyLink, cached, DNS_QUERY_A, myautoconnect);
  74                 ServerInstance->AddResolver(snr, cached);
  75                 return;
  76         }
  77         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s", MyLink->Name.c_str(), errormessage.c_str() );
  78         Utils->Creator->ConnectServer(myautoconnect, false);
  79 }
  80
  81 SecurityIPResolver::SecurityIPResolver(Module* me, SpanningTreeUtilities* U, const std::string &hostname, Link* x, bool &cached, QueryType qt)
  82                 : Resolver(hostname, qt, cached, me), MyLink(x), Utils(U), mine(me), host(hostname), query(qt)
  83 {
  84 }
  85
  86 void SecurityIPResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  87 {
  88         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i != Utils->LinkBlocks.end(); ++i)
  89         {
  90                 Link* L = *i;
  91                 if (L->IPAddr == host)
  92                 {
  93                         Utils->ValidIPs.push_back(result);
  94                         break;
  95                 }
  96         }
  97 }
  98
  99 void SecurityIPResolver::OnError(ResolverError e, const std::string &errormessage)
 100 {
 101         if (query == DNS_QUERY_AAAA)
 102         {
 103                 bool cached = false;
 104                 SecurityIPResolver* res = new SecurityIPResolver(mine, Utils, host, MyLink, cached, DNS_QUERY_A);
 105                 ServerInstance->AddResolver(res, cached);
 106                 return;
 107         }
 108         ServerInstance->Logs->Log("m_spanningtree",LOG_DEFAULT,"Could not resolve IP associated with Link '%s': %s",
 109                 MyLink->Name.c_str(),errormessage.c_str());
 110 }