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 /** This class is used to resolve server hostnames during /connect and autoconnect.
  32  * As of 1.1, the resolver system is seperated out from BufferedSocket, so we must do this
  33  * resolver step first ourselves if we need it. This is totally nonblocking, and will
  34  * callback to OnLookupComplete or OnError when completed. Once it has completed we
  35  * will have an IP address which we can then use to continue our connection.
  36  */
  37 ServernameResolver::ServernameResolver(DNS::Manager* mgr, const std::string& hostname, Link* x, DNS::QueryType qt, Autoconnect* myac)
  38         : DNS::Request(mgr, Utils->Creator, hostname, qt)
  39         , query(qt), host(hostname), MyLink(x), myautoconnect(myac)
  40 {
  41 }
  42
  43 void ServernameResolver::OnLookupComplete(const DNS::Query *r)
  44 {
  45         const DNS::ResourceRecord* const ans_record = r->FindAnswerOfType(this->question.type);
  46         if (!ans_record)
  47         {
  48                 OnError(r);
  49                 return;
  50         }
  51
  52         /* Initiate the connection, now that we have an IP to use.
  53          * Passing a hostname directly to BufferedSocket causes it to
  54          * just bail and set its FD to -1.
  55          */
  56         TreeServer* CheckDupe = Utils->FindServer(MyLink->Name.c_str());
  57         if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
  58         {
  59                 TreeSocket* newsocket = new TreeSocket(MyLink, myautoconnect, ans_record->rdata);
  60                 if (newsocket->GetFd() > -1)
  61                 {
  62                         /* We're all OK */
  63                 }
  64                 else
  65                 {
  66                         /* Something barfed, show the opers */
  67                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",
  68                                 MyLink->Name.c_str(), newsocket->getError().c_str());
  69                         ServerInstance->GlobalCulls.AddItem(newsocket);
  70                 }
  71         }
  72 }
  73
  74 void ServernameResolver::OnError(const DNS::Query *r)
  75 {
  76         if (r->error == DNS::ERROR_UNLOADED)
  77         {
  78                 // We're being unloaded, skip the snotice and ConnectServer() below to prevent autoconnect creating new sockets
  79                 return;
  80         }
  81
  82         if (query == DNS::QUERY_AAAA)
  83         {
  84                 ServernameResolver* snr = new ServernameResolver(this->manager, host, MyLink, DNS::QUERY_A, myautoconnect);
  85                 try
  86                 {
  87                         this->manager->Process(snr);
  88                         return;
  89                 }
  90                 catch (DNS::Exception &)
  91                 {
  92                         delete snr;
  93                 }
  94         }
  95
  96         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());
  97         Utils->Creator->ConnectServer(myautoconnect, false);
  98 }
  99
 100 SecurityIPResolver::SecurityIPResolver(Module* me, DNS::Manager* mgr, const std::string& hostname, Link* x, DNS::QueryType qt)
 101         : DNS::Request(mgr, me, hostname, qt)
 102         , MyLink(x), mine(me), host(hostname), query(qt)
 103 {
 104 }
 105
 106 void SecurityIPResolver::OnLookupComplete(const DNS::Query *r)
 107 {
 108         const DNS::ResourceRecord &ans_record = r->answers[0];
 109
 110         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i != Utils->LinkBlocks.end(); ++i)
 111         {
 112                 Link* L = *i;
 113                 if (L->IPAddr == host)
 114                 {
 115                         Utils->ValidIPs.push_back(ans_record.rdata);
 116                         break;
 117                 }
 118         }
 119 }
 120
 121 void SecurityIPResolver::OnError(const DNS::Query *r)
 122 {
 123         // This can be called because of us being unloaded but we don't have to do anything differently
 124         if (query == DNS::QUERY_AAAA)
 125         {
 126                 SecurityIPResolver* res = new SecurityIPResolver(mine, this->manager, host, MyLink, DNS::QUERY_A);
 127                 try
 128                 {
 129                         this->manager->Process(res);
 130                         return;
 131                 }
 132                 catch (DNS::Exception &)
 133                 {
 134                         delete res;
 135                 }
 136         }
 137         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Could not resolve IP associated with Link '%s': %s",
 138                 MyLink->Name.c_str(), this->manager->GetErrorStr(r->error).c_str());
 139 }
 140
 141 CacheRefreshTimer::CacheRefreshTimer()
 142         : Timer(3600, true)
 143 {
 144 }
 145
 146 bool CacheRefreshTimer::Tick(time_t TIME)
 147 {
 148         Utils->RefreshIPCache();
 149         return true;
 150 }