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                                 if (this->bound_user->client_sa.sa.sa_family == AF_INET6)
  38                                 {
  39                                         /* IPV6 forward lookup */
  40                                         res_forward = new UserResolver(this->ServerInstance, this->bound_user, result, DNS_QUERY_AAAA, lcached);
  41                                 }
  42                                 else
  43                                 {
  44                                         /* IPV4 lookup */
  45                                         res_forward = new UserResolver(this->ServerInstance, this->bound_user, result, DNS_QUERY_A, lcached);
  46                                 }
  47                                 this->ServerInstance->AddResolver(res_forward, lcached);
  48                         }
  49                 }
  50                 catch (CoreException& e)
  51                 {
  52                         ServerInstance->Logs->Log("RESOLVER", DEBUG,"Error in resolver: %s",e.GetReason());
  53                 }
  54         }
  55         else if ((this->fwd) && (ServerInstance->SE->GetRef(this->bound_fd) == this->bound_user))
  56         {
  57                 /* Both lookups completed */
  58
  59                 irc::sockets::sockaddrs* user_ip = &this->bound_user->client_sa;
  60                 bool rev_match = false;
  61                 if (user_ip->sa.sa_family == AF_INET6)
  62                 {
  63                         struct in6_addr res_bin;
  64                         if (inet_pton(AF_INET6, result.c_str(), &res_bin))
  65                         {
  66                                 rev_match = !memcmp(&user_ip->in6.sin6_addr, &res_bin, sizeof(res_bin));
  67                         }
  68                 }
  69                 else
  70                 {
  71                         struct in_addr res_bin;
  72                         if (inet_pton(AF_INET, result.c_str(), &res_bin))
  73                         {
  74                                 rev_match = !memcmp(&user_ip->in4.sin_addr, &res_bin, sizeof(res_bin));
  75                         }
  76                 }
  77
  78                 if (rev_match)
  79                 {
  80                         std::string hostname = this->bound_user->stored_host;
  81                         if (hostname.length() < 65)
  82                         {
  83                                 /* Check we didnt time out */
  84                                 if ((this->bound_user->registered != REG_ALL) && (!this->bound_user->dns_done))
  85                                 {
  86                                         /* Hostnames starting with : are not a good thing (tm) */
  87                                         if (hostname[0] == ':')
  88                                                 hostname.insert(0, "0");
  89
  90                                         this->bound_user->WriteServ("NOTICE Auth :*** Found your hostname (%s)%s", hostname.c_str(), (cached ? " -- cached" : ""));
  91                                         this->bound_user->dns_done = true;
  92                                         this->bound_user->dhost.assign(hostname, 0, 64);
  93                                         this->bound_user->host.assign(hostname, 0, 64);
  94                                         /* Invalidate cache */
  95                                         this->bound_user->InvalidateCache();
  96                                 }
  97                         }
  98                         else
  99                         {
 100                                 if (!this->bound_user->dns_done)
 101                                 {
 102                                         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());
 103                                         this->bound_user->dns_done = true;
 104                                 }
 105                         }
 106                 }
 107                 else
 108                 {
 109                         if (!this->bound_user->dns_done)
 110                         {
 111                                 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());
 112                                 this->bound_user->dns_done = true;
 113                         }
 114                 }
 115
 116                 // Save some memory by freeing this up; it's never used again in the user's lifetime.
 117                 this->bound_user->stored_host.resize(0);
 118         }
 119 }
 120
 121 void UserResolver::OnError(ResolverError e, const std::string &errormessage)
 122 {
 123         if (ServerInstance->SE->GetRef(this->bound_fd) == this->bound_user)
 124         {
 125                 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());
 126                 this->bound_user->dns_done = true;
 127                 this->bound_user->stored_host.resize(0);
 128                 ServerInstance->stats->statsDnsBad++;
 129         }
 130 }