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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
UserResolver::UserResolver(LocalUser* user, std::string to_resolve, QueryType qt, bool &cache) :
Resolver(to_resolve, qt, cache, NULL), uuid(user->uuid)
{
this->fwd = (qt == DNS_QUERY_A || qt == DNS_QUERY_AAAA);
}
void UserResolver::OnLookupComplete(const std::string &result, unsigned int ttl, bool cached)
{
UserResolver *res_forward; // for forward-resolution
LocalUser* bound_user = (LocalUser*)ServerInstance->FindUUID(uuid);
if (!bound_user)
{
ServerInstance->Logs->Log("RESOLVER", DEBUG, "Resolution finished for user '%s' who is gone", uuid.c_str());
return;
}
ServerInstance->Logs->Log("RESOLVER", DEBUG, "DNS result for %s: '%s' -> '%s'", uuid.c_str(), input.c_str(), result.c_str());
if (!fwd)
{
// first half of resolution is done. We now need to verify that the host matches.
bound_user->stored_host = result;
try
{
/* Check we didnt time out */
if (bound_user->registered != REG_ALL)
{
bool lcached = false;
if (bound_user->client_sa.sa.sa_family == AF_INET6)
{
/* IPV6 forward lookup */
res_forward = new UserResolver(bound_user, result, DNS_QUERY_AAAA, lcached);
}
else
{
/* IPV4 lookup */
res_forward = new UserResolver(bound_user, result, DNS_QUERY_A, lcached);
}
ServerInstance->AddResolver(res_forward, lcached);
}
}
catch (CoreException& e)
{
ServerInstance->Logs->Log("RESOLVER", DEBUG,"Error in resolver: %s",e.GetReason());
}
}
else
{
/* Both lookups completed */
irc::sockets::sockaddrs* user_ip = &bound_user->client_sa;
bool rev_match = false;
if (user_ip->sa.sa_family == AF_INET6)
{
struct in6_addr res_bin;
if (inet_pton(AF_INET6, result.c_str(), &res_bin))
{
rev_match = !memcmp(&user_ip->in6.sin6_addr, &res_bin, sizeof(res_bin));
}
}
else
{
struct in_addr res_bin;
if (inet_pton(AF_INET, result.c_str(), &res_bin))
{
rev_match = !memcmp(&user_ip->in4.sin_addr, &res_bin, sizeof(res_bin));
}
}
if (rev_match)
{
std::string hostname = bound_user->stored_host;
if (hostname.length() < 65)
{
/* Check we didnt time out */
if ((bound_user->registered != REG_ALL) && (!bound_user->dns_done))
{
/* Hostnames starting with : are not a good thing (tm) */
if (hostname[0] == ':')
hostname.insert(0, "0");
bound_user->WriteServ("NOTICE Auth :*** Found your hostname (%s)%s", hostname.c_str(), (cached ? " -- cached" : ""));
bound_user->dns_done = true;
bound_user->dhost.assign(hostname, 0, 64);
bound_user->host.assign(hostname, 0, 64);
/* Invalidate cache */
bound_user->InvalidateCache();
}
}
else
{
if (!bound_user->dns_done)
{
bound_user->WriteServ("NOTICE Auth :*** Your hostname is longer than the maximum of 64 characters, using your IP address (%s) instead.", bound_user->GetIPString().c_str());
bound_user->dns_done = true;
}
}
}
else
{
if (!bound_user->dns_done)
{
bound_user->WriteServ("NOTICE Auth :*** Your hostname does not match up with your IP address. Sorry, using your IP address (%s) instead.", bound_user->GetIPString().c_str());
bound_user->dns_done = true;
}
}
// Save some memory by freeing this up; it's never used again in the user's lifetime.
bound_user->stored_host.resize(0);
}
}
void UserResolver::OnError(ResolverError e, const std::string &errormessage)
{
LocalUser* bound_user = (LocalUser*)ServerInstance->FindUUID(uuid);
if (bound_user)
{
bound_user->WriteServ("NOTICE Auth :*** Could not resolve your hostname: %s; using your IP address (%s) instead.", errormessage.c_str(), bound_user->GetIPString().c_str());
bound_user->dns_done = true;
bound_user->stored_host.resize(0);
ServerInstance->stats->statsDnsBad++;
}
}
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