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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2019-2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013, 2016 Adam <Adam@anope.org>
* Copyright (C) 2012-2014, 2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007, 2010 Craig Edwards <brain@inspircd.org>
* Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
*
* 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"
#include "cachetimer.h"
#include "resolvers.h"
#include "main.h"
#include "utils.h"
#include "treeserver.h"
#include "link.h"
#include "treesocket.h"
/** This class is used to resolve server hostnames during /connect and autoconnect.
* As of 1.1, the resolver system is separated out from BufferedSocket, so we must do this
* resolver step first ourselves if we need it. This is totally nonblocking, and will
* callback to OnLookupComplete or OnError when completed. Once it has completed we
* will have an IP address which we can then use to continue our connection.
*/
ServernameResolver::ServernameResolver(DNS::Manager* mgr, const std::string& hostname, Link* x, DNS::QueryType qt, Autoconnect* myac)
: DNS::Request(mgr, Utils->Creator, hostname, qt)
, query(qt), host(hostname), MyLink(x), myautoconnect(myac)
{
}
void ServernameResolver::OnLookupComplete(const DNS::Query *r)
{
const DNS::ResourceRecord* const ans_record = r->FindAnswerOfType(this->question.type);
if (!ans_record)
{
OnError(r);
return;
}
irc::sockets::sockaddrs sa;
if (!irc::sockets::aptosa(ans_record->rdata, MyLink->Port, sa))
{
// We had a result but it wasn't a valid IPv4/IPv6.
OnError(r);
return;
}
/* Initiate the connection, now that we have an IP to use.
* Passing a hostname directly to BufferedSocket causes it to
* just bail and set its FD to -1.
*/
TreeServer* CheckDupe = Utils->FindServer(MyLink->Name);
if (!CheckDupe) /* Check that nobody tried to connect it successfully while we were resolving */
{
TreeSocket* newsocket = new TreeSocket(MyLink, myautoconnect, sa);
if (!newsocket->HasFd())
{
/* Something barfed, show the opers */
ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: %s.",
MyLink->Name.c_str(), newsocket->getError().c_str());
ServerInstance->GlobalCulls.AddItem(newsocket);
}
}
}
void ServernameResolver::OnError(const DNS::Query *r)
{
if (r->error == DNS::ERROR_UNLOADED)
{
// We're being unloaded, skip the snotice and ConnectServer() below to prevent autoconnect creating new sockets
return;
}
if (query == DNS::QUERY_AAAA)
{
ServernameResolver* snr = new ServernameResolver(this->manager, host, MyLink, DNS::QUERY_A, myautoconnect);
try
{
this->manager->Process(snr);
return;
}
catch (DNS::Exception &)
{
delete snr;
}
}
ServerInstance->SNO->WriteToSnoMask('l', "CONNECT: Error connecting \002%s\002: Unable to resolve hostname - %s", MyLink->Name.c_str(), this->manager->GetErrorStr(r->error).c_str());
Utils->Creator->ConnectServer(myautoconnect, false);
}
SecurityIPResolver::SecurityIPResolver(Module* me, DNS::Manager* mgr, const std::string& hostname, Link* x, DNS::QueryType qt)
: DNS::Request(mgr, me, hostname, qt)
, MyLink(x), mine(me), host(hostname), query(qt)
{
}
void SecurityIPResolver::OnLookupComplete(const DNS::Query *r)
{
for (std::vector<reference<Link> >::iterator i = Utils->LinkBlocks.begin(); i != Utils->LinkBlocks.end(); ++i)
{
Link* L = *i;
if (L->IPAddr == host)
{
for (std::vector<DNS::ResourceRecord>::const_iterator j = r->answers.begin(); j != r->answers.end(); ++j)
{
const DNS::ResourceRecord& ans_record = *j;
if (ans_record.type == this->question.type)
Utils->ValidIPs.push_back(ans_record.rdata);
}
break;
}
}
}
void SecurityIPResolver::OnError(const DNS::Query *r)
{
// This can be called because of us being unloaded but we don't have to do anything differently
if (query == DNS::QUERY_AAAA)
{
SecurityIPResolver* res = new SecurityIPResolver(mine, this->manager, host, MyLink, DNS::QUERY_A);
try
{
this->manager->Process(res);
return;
}
catch (DNS::Exception &)
{
delete res;
}
}
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Could not resolve IP associated with Link '%s': %s",
MyLink->Name.c_str(), this->manager->GetErrorStr(r->error).c_str());
}
CacheRefreshTimer::CacheRefreshTimer()
: Timer(3600, true)
{
}
bool CacheRefreshTimer::Tick(time_t TIME)
{
Utils->RefreshIPCache();
return true;
}
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