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 "cachetimer.h"
  24 #include "resolvers.h"
  25 #include "main.h"
  26 #include "utils.h"
  27 #include "treeserver.h"
  28 #include "link.h"
  29 #include "treesocket.h"
  30
  31 /* $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 */
  32
  33 /** This class is used to resolve server hostnames during /connect and autoconnect.
  34  * As of 1.1, the resolver system is seperated out from BufferedSocket, so we must do this
  35  * resolver step first ourselves if we need it. This is totally nonblocking, and will
  36  * callback to OnLookupComplete or OnError when completed. Once it has completed we
  37  * will have an IP address which we can then use to continue our connection.
  38  */
  39 ServernameResolver::ServernameResolver(SpanningTreeUtilities* Util, const std::string &hostname, Link* x, bool &cached, QueryType qt, Autoconnect* myac)
  40         : Resolver(hostname, qt, cached, Util->Creator), Utils(Util), query(qt), host(hostname), MyLink(x), myautoconnect(myac)
  41 {
  42 }
  43
  44 void ServernameResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  45 {
  46         /* Initiate the connection, now that we have an IP to use.
  47          * Passing a hostname directly to BufferedSocket causes it to
  48          * just bail and set its FD to -1.
  49          */
  50         TreeServer* CheckDupe = Utils->FindServer(MyLink->Name.c_str());
  51         if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
  52         {
  53                 TreeSocket* newsocket = new TreeSocket(Utils, MyLink, myautoconnect, result);
  54                 if (newsocket->GetFd() > -1)
  55                 {
  56                         /* We're all OK */
  57                 }
  58                 else
  59                 {
  60                         /* Something barfed, show the opers */
  61                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",
  62                                 MyLink->Name.c_str(), newsocket->getError().c_str());
  63                         ServerInstance->GlobalCulls.AddItem(newsocket);
  64                 }
  65         }
  66 }
  67
  68 void ServernameResolver::OnError(ResolverError e, const std::string &errormessage)
  69 {
  70         /* Ooops! */
  71         if (query == DNS_QUERY_AAAA)
  72         {
  73                 bool cached = false;
  74                 ServernameResolver* snr = new ServernameResolver(Utils, host, MyLink, cached, DNS_QUERY_A, myautoconnect);
  75                 ServerInstance->AddResolver(snr, cached);
  76                 return;
  77         }
  78         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s", MyLink->Name.c_str(), errormessage.c_str() );
  79         Utils->Creator->ConnectServer(myautoconnect, false);
  80 }
  81
  82 SecurityIPResolver::SecurityIPResolver(Module* me, SpanningTreeUtilities* U, const std::string &hostname, Link* x, bool &cached, QueryType qt)
  83                 : Resolver(hostname, qt, cached, me), MyLink(x), Utils(U), mine(me), host(hostname), query(qt)
  84 {
  85 }
  86
  87 void SecurityIPResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  88 {
  89         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i != Utils->LinkBlocks.end(); ++i)
  90         {
  91                 Link* L = *i;
  92                 if (L->IPAddr == host)
  93                 {
  94                         Utils->ValidIPs.push_back(result);
  95                         break;
  96                 }
  97         }
  98 }
  99
 100 void SecurityIPResolver::OnError(ResolverError e, const std::string &errormessage)
 101 {
 102         if (query == DNS_QUERY_AAAA)
 103         {
 104                 bool cached = false;
 105                 SecurityIPResolver* res = new SecurityIPResolver(mine, Utils, host, MyLink, cached, DNS_QUERY_A);
 106                 ServerInstance->AddResolver(res, cached);
 107                 return;
 108         }
 109         ServerInstance->Logs->Log("m_spanningtree",LOG_DEFAULT,"Could not resolve IP associated with Link '%s': %s",
 110                 MyLink->Name.c_str(),errormessage.c_str());
 111 }
 112
 113 CacheRefreshTimer::CacheRefreshTimer(SpanningTreeUtilities* Util)
 114         : Timer(3, ServerInstance->Time(), true), Utils(Util)
 115 {
 116 }
 117
 118 bool CacheRefreshTimer::Tick(time_t TIME)
 119 {
 120         Utils->RefreshIPCache();
 121         return true;
 122 }