C # TcpClient.Connect via proxy

Question

I searched high and low, trying to figure it out, but all that I've seen so far, people just tell me to use other methods.

From this point of view, my problem is that I am trying to connect to the server through TcpClient using the socks 5 proxy

My current setup:

Client = new TcpClient(); Client.Connect(EndPoint); NetworkStream = Client.GetStream(); Stream = new new BufferedStream(NetworkStream); Stream.Write...//Write Packet information etc 

I'm not sure that I missed any information, so if I have it, I will gladly update it.

Answer 1

I really don't think .Net is equipped with Socks5 support or a TCP proxy server.

There are several third-party implementations (google knows more), of course, but it's also pretty easy to implement (part of) RFC 1928 on your own.

Here is an example of the Socks5 client that I just hacked. You really want to clear it: p. Auth negotiation, connection setup, and finally a simple HTTP request are all done.

 using System; using System.IO; using System.Net; using System.Net.Sockets; using System.Text; namespace tcpsocks5 { static class Program { static void ReadAll(this NetworkStream stream, byte[] buffer, int offset, int size) { while (size != 0) { var read = stream.Read(buffer, offset, size); if (read < 0) { throw new IOException("Premature end"); } size -= read; offset += read; } } static void Main(string[] args) { using (var client = new TcpClient()) { client.Connect(ip, port); // Provide IP, Port yourself using (var stream = client.GetStream()) { // Auth var buf = new byte[300]; buf[0] = 0x05; // Version buf[1] = 0x01; // NMETHODS buf[2] = 0x00; // No auth-method stream.Write(buf, 0, 3); stream.ReadAll(buf, 0, 2); if (buf[0] != 0x05) { throw new IOException("Invalid Socks Version"); } if (buf[1] == 0xff) { throw new IOException("Socks Server does not support no-auth"); } if (buf[1] != 0x00) { throw new Exception("Socks Server did choose bogus auth"); } // Request buf[0] = 0x05; // Version buf[1] = 0x01; // Connect (TCP) buf[2] = 0x00; // Reserved buf[3] = 0x03; // Dest.Addr: Domain name var domain = Encoding.ASCII.GetBytes("google.com"); buf[4] = (byte)domain.Length; // Domain name length (octet) Array.Copy(domain, 0, buf, 5, domain.Length); var port = BitConverter.GetBytes( IPAddress.HostToNetworkOrder((short)80)); buf[5 + domain.Length] = port[0]; buf[6 + domain.Length] = port[1]; stream.Write(buf, 0, domain.Length + 7); // Reply stream.ReadAll(buf, 0, 4); if (buf[0] != 0x05) { throw new IOException("Invalid Socks Version"); } if (buf[1] != 0x00) { throw new IOException(string.Format("Socks Error {0:X}", buf[1])); } var rdest = string.Empty; switch (buf[3]) { case 0x01: // IPv4 stream.ReadAll(buf, 0, 4); var v4 = BitConverter.ToUInt32(buf, 0); rdest = new IPAddress(v4).ToString(); break; case 0x03: // Domain name stream.ReadAll(buf, 0, 1); if (buf[0] == 0xff) { throw new IOException("Invalid Domain Name"); } stream.ReadAll(buf, 1, buf[0]); rdest = Encoding.ASCII.GetString(buf, 1, buf[0]); break; case 0x04: // IPv6 var octets = new byte[16]; stream.ReadAll(octets, 0, 16); rdest = new IPAddress(octets).ToString(); break; default: throw new IOException("Invalid Address type"); } stream.ReadAll(buf, 0, 2); var rport = (ushort)IPAddress.NetworkToHostOrder((short)BitConverter.ToUInt16(buf, 0)); Console.WriteLine("Connected via {0}:{1}", rdest, rport); // Make an HTTP request, aka. "do stuff ..." using (var writer = new StreamWriter(stream)) { writer.Write("GET / HTTP/1.1\r\nHost: google.com\r\n\r\n"); writer.Flush(); using (var reader = new StreamReader(stream)) { while (true) { var line = reader.ReadLine(); if (string.IsNullOrEmpty(line)) { break; } } } } } } } } } 

Answer 2

I am using starksoft-aspen . It is free and open source.

In the example below, TcpClient is initialized in the "CreateConnection ()" method, but you can also initialize the client yourself, as well as do all this async.

 using Starksoft.Aspen.Proxy; Socks5ProxyClient proxyClient = new Socks5ProxyClient( socks5Proxy.Host, socks5Proxy.Port, socks5Proxy.Username, socks5Proxy.Password); TcpClient client = proxyClient.CreateConnection(destination.Host, destination.Port); NetworkStream stream = client.GetStream();