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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 <net/address.h>
#include <util/functions.h>
#include <util/log.h>
#include "utpex.h"
#include "peer.h"
#include "packetwriter.h"
#include "bdecoder.h"
#include "bencoder.h"
#include "bnode.h"
#include "peermanager.h"
namespace bt
{
UTPex::UTPex(Peer* peer,Uint32 id) : peer(peer),id(id),last_updated(0)
{}
UTPex::~UTPex()
{}
void UTPex::handlePexPacket(const Uint8* packet,Uint32 size)
{
if (size <= 2 || packet[1] != 1)
return;
QByteArray tmp;
tmp.setRawData((const char*)packet,size);
BNode* node = 0;
try
{
BDecoder dec(tmp,false,2);
node = dec.decode();
if (node && node->getType() == BNode::DICT)
{
BDictNode* dict = (BDictNode*)node;
// ut_pex packet, emit signal to notify PeerManager
BValueNode* val = dict->getValue("added");
if (val)
{
QByteArray data = val->data().toByteArray();
peer->emitPex(data);
}
}
}
catch (...)
{
// just ignore invalid packets
Out(SYS_CON|LOG_DEBUG) << "Invalid extended packet" << endl;
}
delete node;
tmp.resetRawData((const char*)packet,size);
}
bool UTPex::needsUpdate() const
{
return bt::GetCurrentTime() - last_updated >= 60*1000;
}
void UTPex::update(PeerManager* pman)
{
last_updated = bt::GetCurrentTime();
std::map<Uint32,net::Address> added;
std::map<Uint32,net::Address> npeers;
PeerManager::CItr itr = pman->beginPeerList();
while (itr != pman->endPeerList())
{
const Peer* p = *itr;
if (p != peer)
{
npeers.insert(std::make_pair(p->getID(),p->getAddress()));
if (peers.count(p->getID()) == 0)
{
// new one, add to added
added.insert(std::make_pair(p->getID(),p->getAddress()));
}
else
{
// erase from old list, so only the dropped ones are left
peers.erase(p->getID());
}
}
itr++;
}
if (!(peers.size() == 0 && added.size() == 0))
{
// encode the whole lot
QByteArray data;
BEncoder enc(new BEncoderBufferOutput(data));
enc.beginDict();
enc.write("added");
encode(enc,added);
enc.write("added.f"); // no idea what this added.f thing means
enc.write("");
enc.write("dropped");
encode(enc,peers);
enc.end();
peer->getPacketWriter().sendExtProtMsg(id,data);
}
peers = npeers;
}
void UTPex::encode(BEncoder & enc,const std::map<Uint32,net::Address> & ps)
{
if (ps.size() == 0)
{
enc.write("");
return;
}
Uint8* buf = new Uint8[ps.size() * 6];
Uint32 size = 0;
std::map<Uint32,net::Address>::const_iterator i = ps.begin();
while (i != ps.end())
{
const net::Address & addr = i->second;
WriteUint32(buf,size,addr.ip());
WriteUint16(buf,size + 4,addr.port());
size += 6;
i++;
}
enc.write(buf,size);
delete [] buf;
}
}
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