public Peer(MetainfoFile infofile, DownloadFile downloadFile,
Sockets.Socket socket, Sockets.NetworkStream netStream, PeerInformation peerInformation)
{
this.infofile = infofile;
this.downloadFile = downloadFile;
this.socket = socket;
this.netStream = netStream;
this.peerInformation = peerInformation;
this.piecesDownloaded = new BitField(this.infofile.PieceCount);
this.peerProtocol.UpThrottle.Start();
this.peerProtocol.DownThrottle.Start();
}
/// <summary>
/// Helper thread method to start the connection to peers
/// </summary>
/// <param name="state"></param>
private void StartPeerConnectionThread(System.IAsyncResult result)
{
object[] objs = (object[])result.AsyncState;
Sockets.Socket socket = (Sockets.Socket)objs[0];
PeerInformation peerinfo = (PeerInformation)objs[1];
ByteField20 infoDigest = new ByteField20(), peerId = new ByteField20();
Sockets.NetworkStream netStream;
try
{
socket.EndConnect(result);
netStream = new Sockets.NetworkStream(socket, true);
// send handshake info
PeerProtocol.SendHandshake(netStream, this.infofile.InfoDigest);
PeerProtocol.ReceiveHandshake(netStream, ref infoDigest);
PeerProtocol.SendPeerId(netStream, this.mSession.LocalPeerID);
if (!PeerProtocol.ReceivePeerId(netStream, ref peerId))
{ // NAT check
socket.Close();
return;
}
// check info digest matches and we are not attempting to connect to ourself
if (infoDigest.Equals(this.infofile.InfoDigest) && !peerId.Equals(this.mSession.LocalPeerID))
{
peerinfo.ID = peerId;
this.AddPeer(socket, netStream, peerinfo);
}
else // info digest doesn't match, close the connection
{
socket.Close();
}
}
catch (System.Exception e)
{
Config.LogException(e);
// die if the connection failed
if (socket != null)
{
socket.Close();
}
return;
}
}
private void OnAccept(System.IAsyncResult result)
{
Sockets.Socket socket;
try
{
// Accept connections from other peers, find the appropriate torrent and add the peer to it
socket = this.mListener.EndAccept(result);
}
catch (System.Exception)
{
if (this.mListener != null)
{
this.mListener.Close();
}
this.mListener = null;
return;
}
try
{
ByteField20 infoDigest = new ByteField20(), peerId = new ByteField20();
Sockets.NetworkStream netStream = new Sockets.NetworkStream(socket, true);
PeerProtocol.ReceiveHandshake(netStream, ref infoDigest);
Torrent torrent = this.FindTorrent(infoDigest);
if (torrent != null)
{
// found it, finish handshaking and add the peer to the list
PeerProtocol.SendHandshake(netStream, torrent.Metainfo.InfoDigest);
PeerProtocol.SendPeerId(netStream, mLocalPeerId);
if (!PeerProtocol.ReceivePeerId(netStream, ref peerId))
{ // NAT check, discard
socket.Close();
}
else
{
if (!peerId.Equals(mLocalPeerId)) // make sure we aren't connecting to ourselves
{
Net.IPEndPoint endPoint = (Net.IPEndPoint)socket.RemoteEndPoint;
PeerInformation peerInformation = new PeerInformation(endPoint.Address.ToString(), endPoint.Port, peerId);
// add the peer to the torrent
torrent.AddPeer(socket, netStream, peerInformation);
}
else
{
socket.Close();
}
}
}
else
{
socket.Close();
}
}
catch (System.Exception e)
{
Config.LogException(e);
socket.Close();
}
this.mListener.BeginAccept(new System.AsyncCallback(OnAccept), null);
}
public Peer(MetainfoFile infofile, DownloadFile downloadFile,
Sockets.Socket socket, Sockets.NetworkStream netStream, PeerInformation peerInformation)
{
this.infofile = infofile;
this.downloadFile = downloadFile;
this.socket = socket;
this.netStream = netStream;
this.peerInformation = peerInformation;
this.piecesDownloaded = new BitField(this.infofile.PieceCount);
this.peerProtocol.UpThrottle.Start();
this.peerProtocol.DownThrottle.Start();
}
// Called by the Session class for peers connecting through the server and in StartPeerConnectionThread() method for peers
// connected to directly
private void AddPeerPrivate(Sockets.Socket socket, Sockets.NetworkStream netStream, PeerInformation peerInformation)
{
try
{
if (Config.ActiveConfig.MaxPeersConnected < this.mPeers.Count)
{
socket.Close();
return;
}
bool connect = true;
if (Config.ActiveConfig.OnlyOneConnectionFromEachIP)
{
foreach (Peer connectedPeer in this.mPeers)
{
if (connectedPeer.Information.IP.Equals(peerInformation.IP))
{
connect = false;
break;
}
}
}
if (!connect)
{
socket.Close();
return;
}
if (!this.downloadFile.Bitfield.AllFalse)
{
PeerProtocol.SendBitfieldMessage(netStream, this.downloadFile);
}
Peer peer = new Peer(this.infofile, this.downloadFile, socket, netStream, peerInformation);
peer.Disconnected += new PeerDisconnectedCallback(peer_Disconnected);
Config.LogDebugMessage("Connection accepted from: " + peer.ToString());
// add to download and upload manager
this.mDownloadStrategy.HookPeerEvents(peer);
this.uploadManager.AddPeer(peer);
this.peerManager.AddPeer(peer);
if (this.PeerConnected != null)
{
this.PeerConnected(this, peer, true);
}
this.mPeers.Add(peer);
}
catch (System.Exception e)
{
Config.LogException(e);
}
}
// Called by the Session class for peers connecting through the server, adds it to a list which can then be added when
// ProcessWaitingData() is called so we keep it on one thread
internal void AddPeer(Sockets.Socket socket, Sockets.NetworkStream netStream, PeerInformation peerInformation)
{
lock (mWaitingPeers.SyncRoot)
{
mWaitingPeers.Add(new object[] { socket, netStream, peerInformation });
}
}
private void OnAccept(System.IAsyncResult result)
{
Sockets.Socket socket;
try
{
// Accept connections from other peers, find the appropriate torrent and add the peer to it
socket = this.mListener.EndAccept(result);
}
catch (System.Exception)
{
if (this.mListener != null)
this.mListener.Close();
this.mListener = null;
return;
}
try
{
ByteField20 infoDigest = new ByteField20(), peerId = new ByteField20();
Sockets.NetworkStream netStream = new Sockets.NetworkStream(socket, true);
PeerProtocol.ReceiveHandshake(netStream, ref infoDigest);
Torrent torrent = this.FindTorrent(infoDigest);
if (torrent != null)
{
// found it, finish handshaking and add the peer to the list
PeerProtocol.SendHandshake(netStream, torrent.Metainfo.InfoDigest);
PeerProtocol.SendPeerId(netStream, mLocalPeerId );
if ( !PeerProtocol.ReceivePeerId( netStream, ref peerId ))
{ // NAT check, discard
socket.Close();
}
else
{
if ( !peerId.Equals( mLocalPeerId ) ) // make sure we aren't connecting to ourselves
{
Net.IPEndPoint endPoint = (Net.IPEndPoint)socket.RemoteEndPoint;
PeerInformation peerInformation = new PeerInformation( endPoint.Address.ToString(), endPoint.Port, peerId );
// add the peer to the torrent
torrent.AddPeer( socket, netStream, peerInformation );
}
else
socket.Close();
}
}
else
socket.Close();
}
catch (System.Exception e)
{
Config.LogException( e );
socket.Close();
}
this.mListener.BeginAccept(new System.AsyncCallback(OnAccept), null);
}
// Called by the Session class for peers connecting through the server and in StartPeerConnectionThread() method for peers
// connected to directly
private void AddPeerPrivate(Sockets.Socket socket, Sockets.NetworkStream netStream, PeerInformation peerInformation)
{
try
{
if ( Config.ActiveConfig.MaxPeersConnected < this.mPeers.Count )
{
socket.Close();
return;
}
bool connect = true;
if (Config.ActiveConfig.OnlyOneConnectionFromEachIP)
{
foreach ( Peer connectedPeer in this.mPeers )
{
if (connectedPeer.Information.IP.Equals(peerInformation.IP))
{
connect = false;
break;
}
}
}
if (!connect)
{
socket.Close();
return;
}
if (!this.downloadFile.Bitfield.AllFalse)
PeerProtocol.SendBitfieldMessage(netStream, this.downloadFile);
Peer peer = new Peer(this.infofile, this.downloadFile, socket, netStream, peerInformation);
peer.Disconnected += new PeerDisconnectedCallback(peer_Disconnected);
Config.LogDebugMessage("Connection accepted from: " + peer.ToString());
// add to download and upload manager
this.mDownloadStrategy.HookPeerEvents(peer);
this.uploadManager.AddPeer(peer);
this.peerManager.AddPeer(peer);
if (this.PeerConnected != null)
this.PeerConnected(this, peer, true);
this.mPeers.Add( peer );
}
catch ( System.Exception e )
{
Config.LogException( e );
}
}
// Called by the Session class for peers connecting through the server, adds it to a list which can then be added when
// ProcessWaitingData() is called so we keep it on one thread
internal void AddPeer( Sockets.Socket socket, Sockets.NetworkStream netStream, PeerInformation peerInformation )
{
lock ( mWaitingPeers.SyncRoot )
{
mWaitingPeers.Add( new object[] { socket, netStream, peerInformation } );
}
}
/// <summary>
/// Parses the response from the tracker, and updates the peer list
/// </summary>
/// <param name="stream">IO stream from response</param>
private void ParseTrackerResponse(IO.Stream stream)
{
this.peerList.Clear();
/*
// because the response stream does not support seeking, we copy the contents to a memorystream
// to send to the bencoder. This shouldnt cause too much of a performance penalty as it shouldnt
// be too large anyway.
byte[] data = new byte[ 1024 ];
IO.MemoryStream responseStream = new IO.MemoryStream();
int dataRead = 0;
while ((dataRead = stream.Read(data, 0, data.Length)) > 0)
{
responseStream.Write(data, 0, dataRead);
}
responseStream.Seek(0, IO.SeekOrigin.Begin);
*/
///
BEncode.Dictionary dic = BEncode.NextDictionary(stream);
// note: sometimes IPs can be duplicated in quick disconnection, so there is a check for any duplications
if (dic.Contains("failure reason"))
{
throw new IO.IOException("Tracker connection failed: " + dic.GetString("failure reason"));
}
else
{
this.updateInterval = dic.GetInteger("interval");
BEncode.Element peers = dic["peers"];
if (peers is BEncode.List)
{
// peer list comes as a list of dictionaries
BEncode.List dicList = (BEncode.List)peers;
foreach (BEncode.Dictionary dicPeer in dicList)
{
ByteField20 peerId = new ByteField20(dicPeer.GetBytes("peer id"));
string peerIp = dicPeer.GetString("ip");
int port = dicPeer.GetInteger("port");
PeerInformation peerinfo = new PeerInformation(peerIp, port, peerId);
if (!this.peerList.Contains(peerinfo))
this.peerList.Add(peerinfo);
}
}
else if (peers is BEncode.String)
{
// else its compressed (this is pretty common)
byte[] compactPeers = ((BEncode.String)peers).Data;
for (int i=0; i<compactPeers.Length; i += 6)
{
int ip1 = 0xFF & compactPeers[i];
int ip2 = 0xFF & compactPeers[i+1];
int ip3 = 0xFF & compactPeers[i+2];
int ip4 = 0xFF & compactPeers[i+3];
int po1 = 0xFF & compactPeers[i+4];
int po2 = 0xFF & compactPeers[i+5];
string peerIp = ip1 + "." + ip2 + "." + ip3 + "." + ip4;
int port = (po1 * 256) + po2;
PeerInformation peerinfo = new PeerInformation(peerIp, port);
if (!this.peerList.Contains(peerinfo))
this.peerList.Add(peerinfo);
}
}
else
throw new TrackerException("Unexcepted error");
}
}
/// <summary>
/// Parses the response from the tracker, and updates the peer list
/// </summary>
/// <param name="stream">IO stream from response</param>
private void ParseTrackerResponse(IO.Stream stream)
{
this.peerList.Clear();
/*
* // because the response stream does not support seeking, we copy the contents to a memorystream
* // to send to the bencoder. This shouldnt cause too much of a performance penalty as it shouldnt
* // be too large anyway.
* byte[] data = new byte[ 1024 ];
* IO.MemoryStream responseStream = new IO.MemoryStream();
* int dataRead = 0;
*
* while ((dataRead = stream.Read(data, 0, data.Length)) > 0)
* {
* responseStream.Write(data, 0, dataRead);
* }
*
* responseStream.Seek(0, IO.SeekOrigin.Begin);
*/
///
BEncode.Dictionary dic = BEncode.NextDictionary(stream);
// note: sometimes IPs can be duplicated in quick disconnection, so there is a check for any duplications
if (dic.Contains("failure reason"))
{
throw new IO.IOException("Tracker connection failed: " + dic.GetString("failure reason"));
}
else
{
this.updateInterval = dic.GetInteger("interval");
BEncode.Element peers = dic["peers"];
if (peers is BEncode.List)
{
// peer list comes as a list of dictionaries
BEncode.List dicList = (BEncode.List)peers;
foreach (BEncode.Dictionary dicPeer in dicList)
{
ByteField20 peerId = new ByteField20(dicPeer.GetBytes("peer id"));
string peerIp = dicPeer.GetString("ip");
int port = dicPeer.GetInteger("port");
PeerInformation peerinfo = new PeerInformation(peerIp, port, peerId);
if (!this.peerList.Contains(peerinfo))
{
this.peerList.Add(peerinfo);
}
}
}
else if (peers is BEncode.String)
{
// else its compressed (this is pretty common)
byte[] compactPeers = ((BEncode.String)peers).Data;
for (int i = 0; i < compactPeers.Length; i += 6)
{
int ip1 = 0xFF & compactPeers[i];
int ip2 = 0xFF & compactPeers[i + 1];
int ip3 = 0xFF & compactPeers[i + 2];
int ip4 = 0xFF & compactPeers[i + 3];
int po1 = 0xFF & compactPeers[i + 4];
int po2 = 0xFF & compactPeers[i + 5];
string peerIp = ip1 + "." + ip2 + "." + ip3 + "." + ip4;
int port = (po1 * 256) + po2;
PeerInformation peerinfo = new PeerInformation(peerIp, port);
if (!this.peerList.Contains(peerinfo))
{
this.peerList.Add(peerinfo);
}
}
}
else
{
throw new TrackerException("Unexcepted error");
}
}
}
