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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Craig Edwards <craigedwards@brainbox.cc>
* 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 "modules/spanningtree.h"
#include "utils.h"
#include "treeserver.h"
#include "link.h"
#include "treesocket.h"
#include "commands.h"
/** Because most of the I/O gubbins are encapsulated within
* BufferedSocket, we just call the superclass constructor for
* most of the action, and append a few of our own values
* to it.
*/
TreeSocket::TreeSocket(Link* link, Autoconnect* myac, const std::string& ipaddr)
: linkID(assign(link->Name)), LinkState(CONNECTING), MyRoot(NULL), proto_version(0), ConnectionFailureShown(false)
, age(ServerInstance->Time())
{
capab = new CapabData;
capab->link = link;
capab->ac = myac;
capab->capab_phase = 0;
if (!link->Hook.empty())
{
ServiceProvider* prov = ServerInstance->Modules->FindService(SERVICE_IOHOOK, link->Hook);
if (!prov)
{
SetError("Could not find hook '" + link->Hook + "' for connection to " + linkID);
return;
}
AddIOHook(static_cast<IOHook*>(prov));
}
DoConnect(ipaddr, link->Port, link->Timeout, link->Bind);
Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, link->Timeout);
SendCapabilities(1);
}
/** When a listening socket gives us a new file descriptor,
* we must associate it with a socket without creating a new
* connection. This constructor is used for this purpose.
*/
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)
, ConnectionFailureShown(false), age(ServerInstance->Time())
{
capab = new CapabData;
capab->capab_phase = 0;
FOREACH_MOD(OnHookIO, (this, via));
if (GetIOHook())
GetIOHook()->OnStreamSocketAccept(this, client, server);
SendCapabilities(1);
Utils->timeoutlist[this] = std::pair<std::string, int>(linkID, 30);
}
ServerState TreeSocket::GetLinkState()
{
return this->LinkState;
}
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 send our SERVER string to 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.
*/
void TreeSocket::OnConnected()
{
if (this->LinkState == CONNECTING)
{
ServerInstance->SNO->WriteGlobalSno('l', "Connection to \2%s\2[%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;
}
void TreeSocket::SendError(const std::string &errormessage)
{
WriteLine("ERROR :"+errormessage);
DoWrite();
LinkState = DYING;
SetError(errormessage);
}
/** This function forces this server to quit, removing this server
* and any users on it (and servers and users below that, etc etc).
* It's very slow and pretty clunky, but luckily unless your network
* is having a REAL bad hair day, this function shouldnt be called
* too many times a month ;-)
*/
void TreeSocket::SquitServer(std::string &from, TreeServer* Current, int& num_lost_servers, int& num_lost_users)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "SquitServer for %s from %s", Current->GetName().c_str(), from.c_str());
/* recursively squit the servers attached to 'Current'.
* We're going backwards so we don't remove users
* while we still need them ;)
*/
const TreeServer::ChildServers& children = Current->GetChildren();
for (TreeServer::ChildServers::const_iterator i = children.begin(); i != children.end(); ++i)
{
TreeServer* recursive_server = *i;
this->SquitServer(from,recursive_server, num_lost_servers, num_lost_users);
}
/* Now we've whacked the kids, whack self */
num_lost_servers++;
num_lost_users += Current->QuitUsers(from);
}
/** This is a wrapper function for SquitServer above, which
* does some validation first and passes on the SQUIT to all
* other remaining servers.
*/
void TreeSocket::Squit(TreeServer* Current, const std::string &reason)
{
bool LocalSquit = false;
if (!Current->IsRoot())
{
DelServerEvent(Utils->Creator, Current->GetName());
if (Current->IsLocal())
{
ServerInstance->SNO->WriteGlobalSno('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
LocalSquit = true;
if (Current->GetSocket()->Introduced())
{
CmdBuilder params("SQUIT");
params.push_back(Current->GetID());
params.push_last(reason);
params.Broadcast();
}
}
else
{
ServerInstance->SNO->WriteGlobalSno('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
}
int num_lost_servers = 0;
int num_lost_users = 0;
std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
SquitServer(from, Current, num_lost_servers, num_lost_users);
ServerInstance->SNO->WriteToSnoMask(LocalSquit ? 'l' : 'L', "Netsplit complete, lost \002%d\002 user%s on \002%d\002 server%s.",
num_lost_users, num_lost_users != 1 ? "s" : "", num_lost_servers, num_lost_servers != 1 ? "s" : "");
Current->Tidy();
Current->GetParent()->DelChild(Current);
Current->cull();
delete Current;
if (Current == MyRoot)
{
MyRoot = NULL;
Close();
}
}
}
CmdResult CommandSQuit::HandleServer(TreeServer* server, std::vector<std::string>& params)
{
TreeServer* quitting = Utils->FindServer(params[0]);
if (!quitting)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Squit from unknown server");
return CMD_FAILURE;
}
TreeSocket* sock = server->GetSocket();
sock->Squit(quitting, params[1]);
return CMD_SUCCESS;
}
/** 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 = line.substr(0,rline);
if (line.find('\0') != std::string::npos)
{
SendError("Read null character from socket");
break;
}
ProcessLine(line);
if (!getError().empty())
break;
}
if (LinkState != CONNECTED && recvq.length() > 4096)
SendError("RecvQ overrun (line too long)");
Utils->Creator->loopCall = false;
}
bool TreeSocket::Introduced()
{
return (capab == NULL);
}
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