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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2013, 2017-2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
* Copyright (C) 2007-2008, 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 "iohook.h"
#include "main.h"
#include "utils.h"
#include "treeserver.h"
#include "link.h"
#include "treesocket.h"
#include "commands.h"
/** Constructor for outgoing connections.
* Because most of the I/O gubbins are encapsulated within
* BufferedSocket, we just call DoConnect() for most of the action,
* and only do minor initialization tasks ourselves.
*/
TreeSocket::TreeSocket(Link* link, Autoconnect* myac, const irc::sockets::sockaddrs& dest)
: linkID(link->Name)
, LinkState(CONNECTING)
, MyRoot(NULL)
, proto_version(0)
, burstsent(false)
, age(ServerInstance->Time())
{
capab = new CapabData;
capab->link = link;
capab->ac = myac;
capab->capab_phase = 0;
capab->remotesa = dest;
irc::sockets::sockaddrs bind;
memset(&bind, 0, sizeof(bind));
if (!link->Bind.empty() && (dest.family() == AF_INET || dest.family() == AF_INET6))
{
if (!irc::sockets::aptosa(link->Bind, 0, bind))
{
state = I_ERROR;
SetError("Bind address '" + link->Bind + "' is not a valid IPv4 or IPv6 address");
TreeSocket::OnError(I_ERR_BIND);
return;
}
else if (bind.family() != dest.family())
{
state = I_ERROR;
SetError("Bind address '" + bind.addr() + "' is not the same address family as destination address '" + dest.addr() + "'");
TreeSocket::OnError(I_ERR_BIND);
return;
}
}
DoConnect(dest, bind, link->Timeout);
Utils->timeoutlist[this] = std::pair<std::string, unsigned int>(linkID, link->Timeout);
SendCapabilities(1);
}
/** Constructor for incoming connections
*/
TreeSocket::TreeSocket(int newfd, ListenSocket* via, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server)
: BufferedSocket(newfd)
, linkID("inbound from " + client->addr())
, LinkState(WAIT_AUTH_1)
, MyRoot(NULL)
, proto_version(0)
, burstsent(false)
, age(ServerInstance->Time())
{
capab = new CapabData;
capab->capab_phase = 0;
capab->remotesa = *client;
for (ListenSocket::IOHookProvList::iterator i = via->iohookprovs.begin(); i != via->iohookprovs.end(); ++i)
{
ListenSocket::IOHookProvRef& iohookprovref = *i;
if (!iohookprovref)
continue;
iohookprovref->OnAccept(this, client, server);
// IOHook could have encountered a fatal error, e.g. if the TLS ClientHello was already in the queue and there was no common TLS version
if (!getError().empty())
{
TreeSocket::OnError(I_ERR_OTHER);
return;
}
}
SendCapabilities(1);
Utils->timeoutlist[this] = std::pair<std::string, unsigned int>(linkID, 30);
}
void TreeSocket::CleanNegotiationInfo()
{
// connect is good, reset the autoconnect block (if used)
if (capab->ac)
capab->ac->position = -1;
delete capab;
capab = NULL;
}
CullResult TreeSocket::cull()
{
Utils->timeoutlist.erase(this);
if (capab && capab->ac)
Utils->Creator->ConnectServer(capab->ac, false);
return this->BufferedSocket::cull();
}
TreeSocket::~TreeSocket()
{
delete capab;
}
/** When an outbound connection finishes connecting, we receive
* this event, and must do CAPAB negotiation with the other
* side. If the other side is happy, as outlined in the server
* to server docs on the inspircd.org site, the other side
* will then send back its own SERVER string eventually.
*/
void TreeSocket::OnConnected()
{
if (this->LinkState == CONNECTING)
{
if (!capab->link->Hook.empty())
{
ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, capab->link->Hook);
if (!prov)
{
SetError("Could not find hook '" + capab->link->Hook + "' for connection to " + linkID);
return;
}
static_cast<IOHookProvider*>(prov)->OnConnect(this);
}
ServerInstance->SNO->WriteGlobalSno('l', "Connection to \002%s\002[%s] started.", linkID.c_str(),
(capab->link->HiddenFromStats ? "<hidden>" : capab->link->IPAddr.c_str()));
this->SendCapabilities(1);
}
}
void TreeSocket::OnError(BufferedSocketError e)
{
ServerInstance->SNO->WriteGlobalSno('l', "Connection to '\002%s\002' failed with error: %s",
linkID.c_str(), getError().c_str());
LinkState = DYING;
Close();
}
void TreeSocket::SendError(const std::string &errormessage)
{
WriteLine("ERROR :"+errormessage);
DoWrite();
LinkState = DYING;
SetError(errormessage);
}
CmdResult CommandSQuit::HandleServer(TreeServer* server, CommandBase::Params& params)
{
TreeServer* quitting = Utils->FindServer(params[0]);
if (!quitting)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Squit from unknown server");
return CMD_FAILURE;
}
CmdResult ret = CMD_SUCCESS;
if (quitting == server)
{
ret = CMD_FAILURE;
server = server->GetParent();
}
else if (quitting->GetParent() != server)
throw ProtocolException("Attempted to SQUIT a non-directly connected server or the parent");
server->SQuitChild(quitting, params[1]);
// XXX: Return CMD_FAILURE when servers SQUIT themselves (i.e. :00S SQUIT 00S :Shutting down)
// to stop this message from being forwarded.
// The squit logic generates a SQUIT message with our sid as the source and sends it to the
// remaining servers.
return ret;
}
/** This function is called when we receive data from a remote
* server.
*/
void TreeSocket::OnDataReady()
{
Utils->Creator->loopCall = true;
std::string line;
while (GetNextLine(line))
{
std::string::size_type rline = line.find('\r');
if (rline != std::string::npos)
line.erase(rline);
if (line.find('\0') != std::string::npos)
{
SendError("Read null character from socket");
break;
}
try
{
ProcessLine(line);
}
catch (CoreException& ex)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Error while processing: " + line);
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason());
SendError(ex.GetReason() + " - check the log file for details");
}
if (!getError().empty())
break;
}
if (LinkState != CONNECTED && recvq.length() > 4096)
SendError("RecvQ overrun (line too long)");
Utils->Creator->loopCall = false;
}
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