src/user_resolver.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 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 /* $Core */
  15
  16 #include "inspircd.h"
  17 UserResolver::UserResolver(InspIRCd* Instance, User* user, std::string to_resolve, QueryType qt, bool &cache) :
  18         Resolver(Instance, to_resolve, qt, cache), bound_user(user)
  19 {
  20         this->fwd = (qt == DNS_QUERY_A || qt == DNS_QUERY_AAAA);
  21         this->bound_fd = user->GetFd();
  22 }
  23
  24 void UserResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached, int resultnum)
  25 {
  26         /* We are only interested in the first matching result */
  27         if (resultnum)
  28                 return;
  29
  30         UserResolver *res_forward; // for forward-resolution
  31
  32         if ((!this->fwd) && (ServerInstance->SE->GetRef(this->bound_fd) == this->bound_user))
  33         {
  34                 this->bound_user->stored_host = result;
  35                 try
  36                 {
  37                         /* Check we didnt time out */
  38                         if (this->bound_user->registered != REG_ALL)
  39                         {
  40                                 bool lcached = false;
  41 #ifdef IPV6
  42                                 if (this->bound_user->GetProtocolFamily() == AF_INET6)
  43                                 {
  44                                         /* IPV6 forward lookup (with possibility of 4in6) */
  45                                         const char* ip = this->bound_user->GetIPString();
  46                                         res_forward = new UserResolver(this->ServerInstance, this->bound_user, result, (!strncmp(ip, "0::ffff:", 8) ? DNS_QUERY_A : DNS_QUERY_AAAA), lcached);
  47                                 }
  48                                 else
  49                                         /* IPV4 lookup (mixed protocol mode) */
  50 #endif
  51                                 {
  52                                         /* IPV4 lookup (ipv4 only mode) */
  53                                         res_forward = new UserResolver(this->ServerInstance, this->bound_user, result, DNS_QUERY_A, lcached);
  54                                 }
  55                                 this->ServerInstance->AddResolver(res_forward, lcached);
  56                         }
  57                 }
  58                 catch (CoreException& e)
  59                 {
  60                         ServerInstance->Logs->Log("RESOLVER", DEBUG,"Error in resolver: %s",e.GetReason());
  61                 }
  62         }
  63         else if ((this->fwd) && (ServerInstance->SE->GetRef(this->bound_fd) == this->bound_user))
  64         {
  65                 /* Both lookups completed */
  66
  67                 sockaddr* user_ip = this->bound_user->ip;
  68                 bool rev_match = false;
  69 #ifdef IPV6
  70                 if (user_ip->sa_family == AF_INET6)
  71                 {
  72                         struct in6_addr res_bin;
  73                         if (inet_pton(AF_INET6, result.c_str(), &res_bin))
  74                         {
  75                                 sockaddr_in6* user_ip6 = reinterpret_cast<sockaddr_in6*>(user_ip);
  76                                 rev_match = !memcmp(&user_ip6->sin6_addr, &res_bin, sizeof(res_bin));
  77                         }
  78                 }
  79                 else
  80 #endif
  81                 {
  82                         struct in_addr res_bin;
  83                         if (inet_pton(AF_INET, result.c_str(), &res_bin))
  84                         {
  85                                 sockaddr_in* user_ip4 = reinterpret_cast<sockaddr_in*>(user_ip);
  86                                 rev_match = !memcmp(&user_ip4->sin_addr, &res_bin, sizeof(res_bin));
  87                         }
  88                 }
  89
  90                 if (rev_match)
  91                 {
  92                         std::string hostname = this->bound_user->stored_host;
  93                         if (hostname.length() < 65)
  94                         {
  95                                 /* Check we didnt time out */
  96                                 if ((this->bound_user->registered != REG_ALL) && (!this->bound_user->dns_done))
  97                                 {
  98                                         /* Hostnames starting with : are not a good thing (tm) */
  99                                         if (hostname[0] == ':')
 100                                                 hostname.insert(0, "0");
 101
 102                                         this->bound_user->WriteServ("NOTICE Auth :*** Found your hostname (%s)%s", hostname.c_str(), (cached ? " -- cached" : ""));
 103                                         this->bound_user->dns_done = true;
 104                                         this->bound_user->dhost.assign(hostname, 0, 64);
 105                                         this->bound_user->host.assign(hostname, 0, 64);
 106                                         /* Invalidate cache */
 107                                         this->bound_user->InvalidateCache();
 108                                 }
 109                         }
 110                         else
 111                         {
 112                                 if (!this->bound_user->dns_done)
 113                                 {
 114                                         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());
 115                                         this->bound_user->dns_done = true;
 116                                 }
 117                         }
 118                 }
 119                 else
 120                 {
 121                         if (!this->bound_user->dns_done)
 122                         {
 123                                 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());
 124                                 this->bound_user->dns_done = true;
 125                         }
 126                 }
 127
 128                 // Save some memory by freeing this up; it's never used again in the user's lifetime.
 129                 this->bound_user->stored_host.resize(0);
 130         }
 131 }
 132
 133 void UserResolver::OnError(ResolverError e, const std::string &errormessage)
 134 {
 135         if (ServerInstance->SE->GetRef(this->bound_fd) == this->bound_user)
 136         {
 137                 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());
 138                 this->bound_user->dns_done = true;
 139                 this->bound_user->stored_host.resize(0);
 140                 ServerInstance->stats->statsDnsBad++;
 141         }
 142 }