protected override async Task <Socket> ClientCommandReceived(NetworkStream client, byte[] buffer, int length, CancellationToken cancellationToken)
{
Socket server = null;
Socks4Command cmd;
byte[] response;
IPAddress ip;
string user;
int port;
if (TryParse(buffer, length, out cmd, out port, out ip, out user))
{
var host = ip.ToString();
try {
server = await SocketUtils.ConnectAsync(host, port, null, true, cancellationToken).ConfigureAwait(false);
var remote = (IPEndPoint)server.RemoteEndPoint;
response = GetResponse(Socks4Reply.RequestGranted, remote);
} catch {
response = GetResponse(Socks4Reply.RequestRejected, null);
}
}
else
{
response = GetResponse(Socks4Reply.RequestRejected, null);
}
await client.WriteAsync(response, 0, response.Length, cancellationToken).ConfigureAwait(false);
return(server);
}
protected override async Task <Socket> ClientCommandReceived(NetworkStream client, byte[] buffer, int length, CancellationToken cancellationToken)
{
byte[] response = null;
Socket server = null;
Buffer.BlockCopy(buffer, 0, request, requestLength, length);
requestLength += length;
switch (state)
{
case Socks5ListenerState.NegotiateAuthMethod:
response = NegotiateAuthMethod();
break;
case Socks5ListenerState.Authenticate:
response = Authenticate();
break;
case Socks5ListenerState.Command:
var result = Parse(request, requestLength, out Socks5Command cmd, out string host, out int port);
switch (result)
{
case Socks5ParseResult.Success:
try {
server = await SocketUtils.ConnectAsync(host, port, null, true, cancellationToken).ConfigureAwait(false);
var remote = (IPEndPoint)server.RemoteEndPoint;
response = GetCommandResponse(Socks5Reply.Success, remote);
} catch (OperationCanceledException) {
throw;
} catch (SocketException ex) {
response = GetCommandResponse(ex.SocketErrorCode);
} catch {
response = GetCommandResponse(Socks5Reply.GeneralServerFailure, null);
}
break;
case Socks5ParseResult.InvalidAddrType:
response = GetCommandResponse(Socks5Reply.AddressTypeNotSupported, null);
break;
case Socks5ParseResult.InvalidCommand:
response = GetCommandResponse(Socks5Reply.CommandNotSupported, null);
break;
case Socks5ParseResult.NotEnoughData:
response = null;
break;
case Socks5ParseResult.InvalidRequest:
default:
response = GetCommandResponse(Socks5Reply.GeneralServerFailure, null);
break;
}
break;
}
if (response == null)
{
return(null);
}
await client.WriteAsync(response, 0, response.Length, cancellationToken).ConfigureAwait(false);
requestLength = 0;
return(server);
}