public bool Accept(SocksConnectionInfo info)
{
_info = info;
var clientEndPoint = (IPEndPoint)info.Client.Client.RemoteEndPoint;
Console.WriteLine("New connection from {0}:{1} to {2}:{3}", clientEndPoint.Address, clientEndPoint.Port, info.DestIpAddress, info.DestPort);
return(true);
}
private void ProcessConnection(object clientObject)
{
//int b;
var user = new StringBuilder();
var client = (TcpClient)clientObject;
var stream = client.GetStream();
//Version4();
try
{
// Parse Version
var version = stream.ReadByte();
if (version == -1)
{
return;
}
if (version != 5)
{
throw new UnsupportedSocksVersionException(version);
}
// Parse Authentication Method
var authMethodCount = stream.ReadByte();
if (authMethodCount == 0)
{
throw new InvalidSocksHeaderException(string.Format("Authentication Method Count was {0}", authMethodCount));
}
else if (authMethodCount < 0)
{
return;
}
var authMethods = new byte[authMethodCount];
if (!stream.ReadExactly(authMethods))
{
return;
}
if (!authMethods.Any(x => x == (int)SocksAuthMethodCode.None))
{
throw new UnsupportedSocksAuthMethodException(authMethods.Select(x => (SocksAuthMethodCode)x).ToArray());
}
stream.Write(_successReply, 0, _successReply.Length);
// Parse Command Code
var header = new byte[4];
if (!stream.ReadExactly(header))
{
return;
}
var info = new SocksConnectionInfo
{
Proxy = this,
Client = client,
Version = header[0],
Command = (SocksCommandCode)header[1],
DestAddressType = (SocksAddressType)header[3]
};
if (info.Version != 5)
{
throw new UnsupportedSocksVersionException(version);
}
if (info.Command != SocksCommandCode.Stream)
{
throw new UnsupportedSocksCommandException(info.Command);
}
if (header[2] != 0)
{
throw new InvalidSocksHeaderException(string.Format("Expected reserved field to be 0 and not {0}.", header[2]));
}
// Parse Destination Address Type
switch (info.DestAddressType)
{
case SocksAddressType.IPv4:
var ipv4 = new byte[4];
if (!stream.ReadExactly(ipv4))
{
return;
}
info.DestIpAddress = new IPAddress(ipv4);
break;
case SocksAddressType.IPv6:
var ipv6 = new byte[16];
if (!stream.ReadExactly(ipv6))
{
return;
}
info.DestIpAddress = new IPAddress(ipv6);
break;
case SocksAddressType.DomainName:
var domainNameLen = stream.ReadByte();
if (domainNameLen == 0)
{
throw new InvalidSocksHeaderException(string.Format("Unexpected domain name length, {0}.", domainNameLen));
}
else if (domainNameLen < 0)
{
return;
}
var domainName = new byte[domainNameLen];
if (!stream.ReadExactly(domainName))
{
return;
}
info.DestDomainName = Encoding.ASCII.GetString(domainName);
info.DestIpAddress = Dns.GetHostAddresses(info.DestDomainName).FirstOrDefault();
if (info.DestIpAddress == null)
{
throw new SocksDnsException(info.DestDomainName);
}
break;
default:
throw new InvalidSocksHeaderException(string.Format("Unexpected address Type {0}.", (int)info.DestAddressType));
}
// Parse Destination Port
var port = new byte[2];
if (!stream.ReadExactly(port))
{
return;
}
info.DestPort = port[0] * 256 + port[1];
// Reply Success
stream.Write(_successReply, 0, _successReply.Length);
stream.WriteByte(0);
var addressBytes = info.DestIpAddress.GetAddressBytes();
stream.WriteByte((byte)(addressBytes.Length == 4 ? SocksAddressType.IPv4 : SocksAddressType.IPv6));
stream.Write(addressBytes, 0, addressBytes.Length);
stream.Write(port, 0, port.Length);
var connection = _factory();
if (!connection.Accept(info))
{
return;
}
_connections.Add(connection);
connection.Receive(client);
}
finally
{
client.Close();
}
}
