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, DNS::Manager *mgr, const std::string &hostname, Link* x, DNS::QueryType qt, Autoconnect* myac)
  40         : DNS::Request(mgr, Util->Creator, hostname, qt), Utils(Util), query(qt), host(hostname), MyLink(x), myautoconnect(myac)
  41 {
  42 }
  43
  44 void ServernameResolver::OnLookupComplete(const DNS::Query *r)
  45 {
  46         const DNS::ResourceRecord &ans_record = r->answers[0];
  47
  48         /* Initiate the connection, now that we have an IP to use.
  49          * Passing a hostname directly to BufferedSocket causes it to
  50          * just bail and set its FD to -1.
  51          */
  52         TreeServer* CheckDupe = Utils->FindServer(MyLink->Name.c_str());
  53         if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
  54         {
  55                 TreeSocket* newsocket = new TreeSocket(Utils, MyLink, myautoconnect, ans_record.rdata);
  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.",
  64                                 MyLink->Name.c_str(), newsocket->getError().c_str());
  65                         ServerInstance->GlobalCulls.AddItem(newsocket);
  66                 }
  67         }
  68 }
  69
  70 void ServernameResolver::OnError(const DNS::Query *r)
  71 {
  72         /* Ooops! */
  73         if (query == DNS::QUERY_AAAA)
  74         {
  75                 ServernameResolver* snr = new ServernameResolver(Utils, this->manager, host, MyLink, DNS::QUERY_A, myautoconnect);
  76                 try
  77                 {
  78                         this->manager->Process(snr);
  79                         return;
  80                 }
  81                 catch (DNS::Exception &)
  82                 {
  83                         delete snr;
  84                 }
  85         }
  86
  87         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s", MyLink->Name.c_str(), this->manager->GetErrorStr(r->error).c_str());
  88         Utils->Creator->ConnectServer(myautoconnect, false);
  89 }
  90
  91 SecurityIPResolver::SecurityIPResolver(Module* me, SpanningTreeUtilities* U, DNS::Manager *mgr, const std::string &hostname, Link* x, DNS::QueryType qt)
  92                 : DNS::Request(mgr, me, hostname, qt), MyLink(x), Utils(U), mine(me), host(hostname), query(qt)
  93 {
  94 }
  95
  96 void SecurityIPResolver::OnLookupComplete(const DNS::Query *r)
  97 {
  98         const DNS::ResourceRecord &ans_record = r->answers[0];
  99
 100         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i != Utils->LinkBlocks.end(); ++i)
 101         {
 102                 Link* L = *i;
 103                 if (L->IPAddr == host)
 104                 {
 105                         Utils->ValidIPs.push_back(ans_record.rdata);
 106                         break;
 107                 }
 108         }
 109 }
 110
 111 void SecurityIPResolver::OnError(const DNS::Query *r)
 112 {
 113         if (query == DNS::QUERY_AAAA)
 114         {
 115                 SecurityIPResolver* res = new SecurityIPResolver(mine, Utils, this->manager, host, MyLink, DNS::QUERY_A);
 116                 try
 117                 {
 118                         this->manager->Process(res);
 119                         return;
 120                 }
 121                 catch (DNS::Exception &)
 122                 {
 123                         delete res;
 124                 }
 125         }
 126         ServerInstance->Logs->Log("m_spanningtree", LOG_DEFAULT, "Could not resolve IP associated with Link '%s': %s",
 127                 MyLink->Name.c_str(), this->manager->GetErrorStr(r->error).c_str());
 128 }
 129
 130 CacheRefreshTimer::CacheRefreshTimer(SpanningTreeUtilities* Util)
 131         : Timer(3600, ServerInstance->Time(), true), Utils(Util)
 132 {
 133 }
 134
 135 bool CacheRefreshTimer::Tick(time_t TIME)
 136 {
 137         Utils->RefreshIPCache();
 138         return true;
 139 }