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