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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* This program 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; either version 2 of the License, or *
* (at your option) any later version. *
* *
* 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, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#include <util/array.h>
#include <ksocketaddress.h>
#include <kdatagramsocket.h>
#include <ksocketdevice.h>
#include <net/portlist.h>
#include <util/log.h>
#include <util/functions.h>
#include <klocale.h>
#include <kmessagebox.h>
#include "globals.h"
#include "udptrackersocket.h"
using namespace KNetwork;
namespace bt
{
Uint16 UDPTrackerSocket::port = 4444;
UDPTrackerSocket::UDPTrackerSocket()
{
sock = new KNetwork::KDatagramSocket(this);
sock->setAddressReuseable(true);
connect(sock,SIGNAL(readyRead()),this,SLOT(dataReceived()));
int i = 0;
if (port == 0)
port = 4444;
bool bound = false;
while (!(bound = sock->bind(QString::null,QString::number(port + i))) && i < 10)
{
Out() << "Failed to bind socket to port " << (port+i) << endl;
i++;
}
if (!bound)
{
KMessageBox::error(0,
i18n("Cannot bind to udp port %1 or the 10 following ports.").arg(port));
}
else
{
port = port + i;
Globals::instance().getPortList().addNewPort(port,net::UDP,true);
}
}
UDPTrackerSocket::~UDPTrackerSocket()
{
Globals::instance().getPortList().removePort(port,net::UDP);
delete sock;
}
void UDPTrackerSocket::sendConnect(Int32 tid,const KNetwork::KSocketAddress & addr)
{
Int64 cid = 0x41727101980LL;
Uint8 buf[16];
WriteInt64(buf,0,cid);
WriteInt32(buf,8,CONNECT);
WriteInt32(buf,12,tid);
sock->send(KDatagramPacket((char*)buf,16,addr));
transactions.insert(tid,CONNECT);
}
void UDPTrackerSocket::sendAnnounce(Int32 tid,const Uint8* data,const KNetwork::KSocketAddress & addr)
{
transactions.insert(tid,ANNOUNCE);
sock->send(KDatagramPacket((char*)data,98,addr));
}
void UDPTrackerSocket::cancelTransaction(Int32 tid)
{
transactions.remove(tid);
}
void UDPTrackerSocket::handleConnect(const QByteArray & data)
{
const Uint8* buf = (const Uint8*)data.data();
// Read the transaction_id and check it
Int32 tid = ReadInt32(buf,4);
QMap<Int32,Action>::iterator i = transactions.find(tid);
// if we can't find the transaction, just return
if (i == transactions.end())
{
return;
}
// check wether the transaction is a CONNECT
if (i.data() != CONNECT)
{
transactions.erase(i);
error(tid,QString::null);
return;
}
// everything ok, emit signal
transactions.erase(i);
connectRecieved(tid,ReadInt64(buf,8));
}
void UDPTrackerSocket::handleAnnounce(const QByteArray & data)
{
const Uint8* buf = (const Uint8*)data.data();
// Read the transaction_id and check it
Int32 tid = ReadInt32(buf,4);
QMap<Int32,Action>::iterator i = transactions.find(tid);
// if we can't find the transaction, just return
if (i == transactions.end())
return;
// check wether the transaction is a ANNOUNCE
if (i.data() != ANNOUNCE)
{
transactions.erase(i);
error(tid,QString::null);
return;
}
// everything ok, emit signal
transactions.erase(i);
announceRecieved(tid,data);
}
void UDPTrackerSocket::handleError(const QByteArray & data)
{
const Uint8* buf = (const Uint8*)data.data();
// Read the transaction_id and check it
Int32 tid = ReadInt32(buf,4);
QMap<Int32,Action>::iterator it = transactions.find(tid);
// if we can't find the transaction, just return
if (it == transactions.end())
return;
// extract error message
transactions.erase(it);
QString msg;
for (Uint32 i = 8;i < data.size();i++)
msg += (char)buf[i];
// emit signal
error(tid,msg);
}
void UDPTrackerSocket::dataReceived()
{
if (sock->bytesAvailable() == 0)
{
Out(SYS_TRK|LOG_NOTICE) << "0 byte UDP packet " << endl;
// KDatagramSocket wrongly handles UDP packets with no payload
// so we need to deal with it oursleves
int fd = sock->socketDevice()->socket();
char tmp;
read(fd,&tmp,1);
return;
}
KDatagramPacket pck = sock->receive();
const QByteArray & data = pck.data();
const Uint8* buf = (const Uint8*)data.data();
Uint32 type = ReadUint32(buf,0);
switch (type)
{
case CONNECT:
handleConnect(data);
break;
case ANNOUNCE:
handleAnnounce(data);
break;
case ERROR:
handleError(data);
break;
}
}
Int32 UDPTrackerSocket::newTransactionID()
{
Int32 transaction_id = rand() * time(0);
while (transactions.contains(transaction_id))
transaction_id++;
return transaction_id;
}
void UDPTrackerSocket::setPort(Uint16 p)
{
port = p;
}
Uint16 UDPTrackerSocket::getPort()
{
return port;
}
}
#include "udptrackersocket.moc"
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