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         irc::sockets::sockaddrs sa;
  53         if (!irc::sockets::aptosa(ans_record->rdata, MyLink->Port, sa))
  54         {
  55                 // We had a result but it wasn't a valid IPv4/IPv6.
  56                 OnError(r);
  57                 return;
  58         }
  59
  60         /* Initiate the connection, now that we have an IP to use.
  61          * Passing a hostname directly to BufferedSocket causes it to
  62          * just bail and set its FD to -1.
  63          */
  64         TreeServer* CheckDupe = Utils->FindServer(MyLink->Name);
  65         if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
  66         {
  67                 TreeSocket* newsocket = new TreeSocket(MyLink, myautoconnect, sa);
  68                 if (newsocket->GetFd() > -1)
  69                 {
  70                         /* We're all OK */
  71                 }
  72                 else
  73                 {
  74                         /* Something barfed, show the opers */
  75                         ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",
  76                                 MyLink->Name.c_str(), newsocket->getError().c_str());
  77                         ServerInstance->GlobalCulls.AddItem(newsocket);
  78                 }
  79         }
  80 }
  81
  82 void ServernameResolver::OnError(const DNS::Query *r)
  83 {
  84         if (r->error == DNS::ERROR_UNLOADED)
  85         {
  86                 // We're being unloaded, skip the snotice and ConnectServer() below to prevent autoconnect creating new sockets
  87                 return;
  88         }
  89
  90         if (query == DNS::QUERY_AAAA)
  91         {
  92                 ServernameResolver* snr = new ServernameResolver(this->manager, host, MyLink, DNS::QUERY_A, myautoconnect);
  93                 try
  94                 {
  95                         this->manager->Process(snr);
  96                         return;
  97                 }
  98                 catch (DNS::Exception &)
  99                 {
 100                         delete snr;
 101                 }
 102         }
 103
 104         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());
 105         Utils->Creator->ConnectServer(myautoconnect, false);
 106 }
 107
 108 SecurityIPResolver::SecurityIPResolver(Module* me, DNS::Manager* mgr, const std::string& hostname, Link* x, DNS::QueryType qt)
 109         : DNS::Request(mgr, me, hostname, qt)
 110         , MyLink(x), mine(me), host(hostname), query(qt)
 111 {
 112 }
 113
 114 void SecurityIPResolver::OnLookupComplete(const DNS::Query *r)
 115 {
 116         for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i != Utils->LinkBlocks.end(); ++i)
 117         {
 118                 Link* L = *i;
 119                 if (L->IPAddr == host)
 120                 {
 121                         for (std::vector<DNS::ResourceRecord>::const_iterator j = r->answers.begin(); j != r->answers.end(); ++j)
 122                         {
 123                                 const DNS::ResourceRecord& ans_record = *j;
 124                                 if (ans_record.type == this->question.type)
 125                                         Utils->ValidIPs.push_back(ans_record.rdata);
 126                         }
 127                         break;
 128                 }
 129         }
 130 }
 131
 132 void SecurityIPResolver::OnError(const DNS::Query *r)
 133 {
 134         // This can be called because of us being unloaded but we don't have to do anything differently
 135         if (query == DNS::QUERY_AAAA)
 136         {
 137                 SecurityIPResolver* res = new SecurityIPResolver(mine, this->manager, host, MyLink, DNS::QUERY_A);
 138                 try
 139                 {
 140                         this->manager->Process(res);
 141                         return;
 142                 }
 143                 catch (DNS::Exception &)
 144                 {
 145                         delete res;
 146                 }
 147         }
 148         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Could not resolve IP associated with Link '%s': %s",
 149                 MyLink->Name.c_str(), this->manager->GetErrorStr(r->error).c_str());
 150 }
 151
 152 CacheRefreshTimer::CacheRefreshTimer()
 153         : Timer(3600, true)
 154 {
 155 }
 156
 157 bool CacheRefreshTimer::Tick(time_t TIME)
 158 {
 159         Utils->RefreshIPCache();
 160         return true;
 161 }