/*
* InspIRCd -- Internet Relay Chat Daemon
*
* 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 "commands/cmd_whois.h"
#include "commands/cmd_stats.h"
#include "socket.h"
#include "xline.h"
#include "transport.h"
#include "m_hash.h"
#include "socketengine.h"
#include "m_spanningtree/main.h"
#include "m_spanningtree/utils.h"
#include "m_spanningtree/treeserver.h"
#include "m_spanningtree/link.h"
#include "m_spanningtree/treesocket.h"
#include "m_spanningtree/resolvers.h"
#include "m_spanningtree/handshaketimer.h"
/* $ModDep: m_spanningtree/resolvers.h m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/link.h m_spanningtree/treesocket.h m_spanningtree/handshaketimer.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(SpanningTreeUtilities* Util, InspIRCd* SI, std::string shost, int iport, unsigned long maxtime, const std::string &ServerName, const std::string &bindto, Module* HookMod)
: BufferedSocket(SI, shost, iport, maxtime, bindto), Utils(Util), Hook(HookMod)
{
myhost = ServerName;
theirchallenge.clear();
ourchallenge.clear();
this->LinkState = CONNECTING;
Utils->timeoutlist[this] = std::pair<std::string, int>(ServerName, maxtime);
if (Hook)
BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
hstimer = NULL;
}
/** 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(SpanningTreeUtilities* Util, InspIRCd* SI, int newfd, char* ip, Module* HookMod)
: BufferedSocket(SI, newfd, ip), Utils(Util), Hook(HookMod)
{
this->LinkState = WAIT_AUTH_1;
theirchallenge.clear();
ourchallenge.clear();
sentcapab = false;
/* If we have a transport module hooked to the parent, hook the same module to this
* socket, and set a timer waiting for handshake before we send CAPAB etc.
*/
if (Hook)
BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
hstimer = new HandshakeTimer(ServerInstance, this, &(Utils->LinkBlocks[0]), this->Utils, 1);
ServerInstance->Timers->AddTimer(hstimer);
/* Fix by Brain - inbound sockets need a timeout, too. 30 secs should be pleanty */
Utils->timeoutlist[this] = std::pair<std::string, int>("<unknown>", 30);
}
ServerState TreeSocket::GetLinkState()
{
return this->LinkState;
}
Module* TreeSocket::GetHook()
{
return this->Hook;
}
void TreeSocket::CleanNegotiationInfo()
{
ModuleList.clear();
CapKeys.clear();
ourchallenge.clear();
theirchallenge.clear();
OutboundPass.clear();
}
TreeSocket::~TreeSocket()
{
if (Hook)
BufferedSocketUnhookRequest(this, (Module*)Utils->Creator, Hook).Send();
if (hstimer)
ServerInstance->Timers->DelTimer(hstimer);
Utils->timeoutlist.erase(this);
}
/** 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.
*/
bool TreeSocket::OnConnected()
{
if (this->LinkState == CONNECTING)
{
/* we do not need to change state here. */
for (std::vector<Link>::iterator x = Utils->LinkBlocks.begin(); x < Utils->LinkBlocks.end(); x++)
{
if (x->Name == this->myhost)
{
ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] started.", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->GetIP().c_str()));
if (Hook)
{
BufferedSocketHookRequest(this, (Module*)Utils->Creator, Hook).Send();
ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2[%s] using transport \2%s\2", myhost.c_str(), (x->HiddenFromStats ? "<hidden>" : this->GetIP().c_str()),
x->Hook.c_str());
}
this->OutboundPass = x->SendPass;
sentcapab = false;
/* found who we're supposed to be connecting to, send the neccessary gubbins. */
if (this->GetHook())
{
hstimer = new HandshakeTimer(ServerInstance, this, &(*x), this->Utils, 1);
ServerInstance->Timers->AddTimer(hstimer);
}
else
this->SendCapabilities();
return true;
}
}
}
/* There is a (remote) chance that between the /CONNECT and the connection
* being accepted, some muppet has removed the <link> block and rehashed.
* If that happens the connection hangs here until it's closed. Unlikely
* and rather harmless.
*/
ServerInstance->SNO->WriteToSnoMask('l', "Connection to \2%s\2 lost link tag(!)", myhost.c_str());
return true;
}
void TreeSocket::OnError(BufferedSocketError e)
{
OnClose();
Link* MyLink;
switch (e)
{
case I_ERR_CONNECT:
ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Connection to \002%s\002 refused", myhost.c_str());
MyLink = Utils->FindLink(myhost);
if (MyLink)
Utils->DoFailOver(MyLink);
break;
case I_ERR_SOCKET:
ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Could not create socket (%s)", strerror(errno));
break;
case I_ERR_BIND:
ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Error binding socket to address or port (%s)", strerror(errno));
break;
case I_ERR_WRITE:
ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: I/O error on connection (%s)", errno ? strerror(errno) : "Connection closed unexpectedly");
break;
case I_ERR_NOMOREFDS:
ServerInstance->SNO->WriteToSnoMask('l', "Connection failed: Operating system is out of file descriptors!");
break;
default:
if ((errno) && (errno != EINPROGRESS) && (errno != EAGAIN))
ServerInstance->SNO->WriteToSnoMask('l', "Connection to \002%s\002 failed with OS error: %s", myhost.c_str(), strerror(errno));
break;
}
}
int TreeSocket::OnDisconnect()
{
/* For the same reason as above, we don't
* handle OnDisconnect()
*/
return true;
}
void TreeSocket::SendError(const std::string &errormessage)
{
/* Display the error locally as well as sending it remotely */
ServerInstance->SNO->WriteToSnoMask('l', "Sent \2ERROR\2 to %s: %s", (this->InboundServerName.empty() ? this->GetIP().c_str() : this->InboundServerName.c_str()), errormessage.c_str());
this->WriteLine("ERROR :"+errormessage);
/* One last attempt to make sure the error reaches its target */
this->FlushWriteBuffer();
if (LinkState == WAIT_AUTH_2 || LinkState == CONNECTED)
LinkState = ERRORED;
else
LinkState = DYING;
}
/** 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)
{
/* recursively squit the servers attached to 'Current'.
* We're going backwards so we don't remove users
* while we still need them ;)
*/
for (unsigned int q = 0; q < Current->ChildCount(); q++)
{
TreeServer* recursive_server = Current->GetChild(q);
this->SquitServer(from,recursive_server);
}
/* 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) && (Current != Utils->TreeRoot))
{
Event rmode((char*)Current->GetName().c_str(), (Module*)Utils->Creator, "lost_server");
rmode.Send(ServerInstance);
std::deque<std::string> params;
params.push_back(Current->GetName());
params.push_back(":"+reason);
Utils->DoOneToAllButSender(Current->GetParent()->GetName(),"SQUIT",params,Current->GetName());
if (Current->GetParent() == Utils->TreeRoot)
{
this->ServerInstance->SNO->WriteToSnoMask('l', "Server \002"+Current->GetName()+"\002 split: "+reason);
LocalSquit = true;
}
else
{
this->ServerInstance->SNO->WriteToSnoMask('L', "Server \002"+Current->GetName()+"\002 split from server \002"+Current->GetParent()->GetName()+"\002 with reason: "+reason);
}
num_lost_servers = 0;
num_lost_users = 0;
std::string from = Current->GetParent()->GetName()+" "+Current->GetName();
SquitServer(from, Current);
Current->Tidy();
Current->GetParent()->DelChild(Current);
delete Current;
if (LocalSquit)
this->ServerInstance->SNO->WriteToSnoMask('l', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
else
this->ServerInstance->SNO->WriteToSnoMask('L', "Netsplit complete, lost \002%d\002 users on \002%d\002 servers.", num_lost_users, num_lost_servers);
}
else
ServerInstance->Logs->Log("m_spanningtree",DEFAULT,"Squit from unknown server");
}
/** This function is called when we receive data from a remote
* server. We buffer the data in a std::string (it doesnt stay
* there for long), reading using BufferedSocket::Read() which can
* read up to 16 kilobytes in one operation.
*
* IF THIS FUNCTION RETURNS FALSE, THE CORE CLOSES AND DELETES
* THE SOCKET OBJECT FOR US.
*/
bool TreeSocket::OnDataReady()
{
const char* data = this->Read();
if (LinkState == DYING || LinkState == ERRORED)
{
Close();
return true;
}
/* Check that the data read is a valid pointer and it has some content */
if (data && *data)
{
this->in_buffer.append(data);
Utils->Creator->loopCall = true;
/* While there is at least one new line in the buffer,
* do something useful (we hope!) with it.
*/
while (in_buffer.find("\n") != std::string::npos)
{
std::string ret = in_buffer.substr(0,in_buffer.find("\n")-1);
in_buffer = in_buffer.substr(in_buffer.find("\n")+1,in_buffer.length()-in_buffer.find("\n"));
/* Use rfind here not find, as theres more
* chance of the \r being near the end of the
* string, not the start.
*/
if (ret.find("\r") != std::string::npos)
ret = in_buffer.substr(0,in_buffer.find("\r")-1);
/* Process this one, abort if it
* didnt return true.
*/
if (!this->ProcessLine(ret))
{
Utils->Creator->loopCall = false;
OnClose();
// returning false from this function is a bad
// idea, it causes deallocation too soon.
return true;
}
}
Utils->Creator->loopCall = false;
return true;
}
/* EAGAIN returns an empty but non-NULL string, so this
* evaluates to TRUE for EAGAIN but to FALSE for EOF.
*/
if (!data)
OnClose();
return true;
}
