src/user_resolver.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 UserResolver::UserResolver(LocalUser* user, std::string to_resolve, QueryType qt, bool &cache) :
  16         Resolver(to_resolve, qt, cache, NULL), bound_user(user)
  17 {
  18         this->fwd = (qt == DNS_QUERY_A || qt == DNS_QUERY_AAAA);
  19         this->bound_fd = user->GetFd();
  20 }
  21
  22 void UserResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
  23 {
  24         UserResolver *res_forward; // for forward-resolution
  25
  26         if ((!this->fwd) && (ServerInstance->SE->GetRef(this->bound_fd) == &bound_user->eh))
  27         {
  28                 this->bound_user->stored_host = result;
  29                 try
  30                 {
  31                         /* Check we didnt time out */
  32                         if (this->bound_user->registered != REG_ALL)
  33                         {
  34                                 bool lcached = false;
  35                                 if (this->bound_user->client_sa.sa.sa_family == AF_INET6)
  36                                 {
  37                                         /* IPV6 forward lookup */
  38                                         res_forward = new UserResolver(bound_user, result, DNS_QUERY_AAAA, lcached);
  39                                 }
  40                                 else
  41                                 {
  42                                         /* IPV4 lookup */
  43                                         res_forward = new UserResolver(bound_user, result, DNS_QUERY_A, lcached);
  44                                 }
  45                                 ServerInstance->AddResolver(res_forward, lcached);
  46                         }
  47                 }
  48                 catch (CoreException& e)
  49                 {
  50                         ServerInstance->Logs->Log("RESOLVER", DEBUG,"Error in resolver: %s",e.GetReason());
  51                 }
  52         }
  53         else if ((this->fwd) && (ServerInstance->SE->GetRef(this->bound_fd) == &bound_user->eh))
  54         {
  55                 /* Both lookups completed */
  56
  57                 irc::sockets::sockaddrs* user_ip = &this->bound_user->client_sa;
  58                 bool rev_match = false;
  59                 if (user_ip->sa.sa_family == AF_INET6)
  60                 {
  61                         struct in6_addr res_bin;
  62                         if (inet_pton(AF_INET6, result.c_str(), &res_bin))
  63                         {
  64                                 rev_match = !memcmp(&user_ip->in6.sin6_addr, &res_bin, sizeof(res_bin));
  65                         }
  66                 }
  67                 else
  68                 {
  69                         struct in_addr res_bin;
  70                         if (inet_pton(AF_INET, result.c_str(), &res_bin))
  71                         {
  72                                 rev_match = !memcmp(&user_ip->in4.sin_addr, &res_bin, sizeof(res_bin));
  73                         }
  74                 }
  75
  76                 if (rev_match)
  77                 {
  78                         std::string hostname = this->bound_user->stored_host;
  79                         if (hostname.length() < 65)
  80                         {
  81                                 /* Check we didnt time out */
  82                                 if ((this->bound_user->registered != REG_ALL) && (!this->bound_user->dns_done))
  83                                 {
  84                                         /* Hostnames starting with : are not a good thing (tm) */
  85                                         if (hostname[0] == ':')
  86                                                 hostname.insert(0, "0");
  87
  88                                         this->bound_user->WriteServ("NOTICE Auth :*** Found your hostname (%s)%s", hostname.c_str(), (cached ? " -- cached" : ""));
  89                                         this->bound_user->dns_done = true;
  90                                         this->bound_user->dhost.assign(hostname, 0, 64);
  91                                         this->bound_user->host.assign(hostname, 0, 64);
  92                                         /* Invalidate cache */
  93                                         this->bound_user->InvalidateCache();
  94                                 }
  95                         }
  96                         else
  97                         {
  98                                 if (!this->bound_user->dns_done)
  99                                 {
 100                                         this->bound_user->WriteServ("NOTICE Auth :*** Your hostname is longer than the maximum of 64 characters, using your IP address (%s) instead.", this->bound_user->GetIPString());
 101                                         this->bound_user->dns_done = true;
 102                                 }
 103                         }
 104                 }
 105                 else
 106                 {
 107                         if (!this->bound_user->dns_done)
 108                         {
 109                                 this->bound_user->WriteServ("NOTICE Auth :*** Your hostname does not match up with your IP address. Sorry, using your IP address (%s) instead.", this->bound_user->GetIPString());
 110                                 this->bound_user->dns_done = true;
 111                         }
 112                 }
 113
 114                 // Save some memory by freeing this up; it's never used again in the user's lifetime.
 115                 this->bound_user->stored_host.resize(0);
 116         }
 117 }
 118
 119 void UserResolver::OnError(ResolverError e, const std::string &errormessage)
 120 {
 121         if (ServerInstance->SE->GetRef(this->bound_fd) == &bound_user->eh)
 122         {
 123                 this->bound_user->WriteServ("NOTICE Auth :*** Could not resolve your hostname: %s; using your IP address (%s) instead.", errormessage.c_str(), this->bound_user->GetIPString());
 124                 this->bound_user->dns_done = true;
 125                 this->bound_user->stored_host.resize(0);
 126                 ServerInstance->stats->statsDnsBad++;
 127         }
 128 }