I was reading about torchat which is essentially an anonymous chat program.
It sounded cool
so i wanted to experiment with making my own. First i wrote a test to grab a webpage using Http. Sicne .NET doesnt
support SOCKS4A/SOCKS5 i used privoxy and my app worked. Then i switch to a TCP echo test and privoxy doesnt
support TCP
so i searched and installed 6+ proxy apps (freecap, socat, freeproxy, delegate are the ones i can remember from the top of my head, i also played with putty bc i know it supports tunnels and SOCK5) but i couldnt successfully get any of them to work let alone get it running with my http test that privoxy easily and painlessly did.
What may i use to get TCP connections going through TOR? I spent more then 2 hours without success. I don't know if i am looking for a relay, tunnel, forwarder, proxy or a proxychain which all came up in my search. I use the config below for .NET. I need TCP working but i am first testing with http since i know i had it working using privoxy. What apps and configs do i use to get TCP going through tor?
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<system.net>
<defaultProxy enabled="true">
<proxy bypassonlocal="True" proxyaddress="http://127.0.0.1:8118"/>
</defaultProxy>
<settings>
<httpWebRequest useUnsafeHeaderParsing="true"/>
</settings>
</system.net>
</configuration>
-edit- Thanks to Bernd i have a solution. Here is the code i ended up writing. It isn't amazing but its fair.
static NetworkStream ConnectSocksProxy(string proxyDomain, short proxyPort, string host, short hostPort, TcpClient tc)
{
tc.Connect(proxyDomain, proxyPort);
if (System.Text.RegularExpressions.Regex.IsMatch(host, @"[\:/\\]"))
throw new Exception("Invalid Host name. Use FQDN such as www.google.com. Do not have http, a port or / in it");
NetworkStream ns = tc.GetStream();
var HostNameBuf = new ASCIIEncoding().GetBytes(host);
var HostPortBuf = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(hostPort));
if (true) //5
{
var bufout = new byte[128];
var buflen = 0;
ns.Write(new byte[] { 5, 1, 0 }, 0, 3);
buflen = ns.Read(bufout, 0, bufout.Length);
if (buflen != 2 || bufout[0] != 5 || bufout[1] != 0)
throw new Exception();
var buf = new byte[] { 5, 1, 0, 3, (byte)HostNameBuf.Length };
var mem = new MemoryStream();
mem.Write(buf, 0, buf.Length);
mem.Write(HostNameBuf, 0, HostNameBuf.Length);
mem.Write(new byte[] { HostPortBuf[0], HostPortBuf[1] }, 0, 2);
var memarr = mem.ToArray();
ns.Write(memarr, 0, memarr.Length);
buflen = ns.Read(bufout, 0, bufout.Length);
if (bufout[0] != 5 || bufout[1] != 0)
throw new Exception();
}
else //4a
{
var bufout = new byte[128];
var buflen = 0;
var mem = new MemoryStream();
mem.WriteByte(4);
mem.WriteByte(1);
mem.Write(HostPortBuf, 0, 2);
mem.Write(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(1)), 0, 4);
mem.WriteByte(0);
mem.Write(HostNameBuf, 0, HostNameBuf.Length);
mem.WriteByte(0);
var memarr = mem.ToArray();
ns.Write(memarr, 0, memarr.Length);
buflen = ns.Read(bufout, 0, bufout.Length);
if (buflen != 8 || bufout[0] != 0 || bufout[1] != 90)
throw new Exception();
}
return ns;
}
Usage
using (TcpClient client = new TcpClient())
using (var ns = ConnectSocksProxy("127.0.0.1", 9050, "website.com", 80, client)) {...}
