How to let Tor service to perform the DNS resolution using Socket?
I want to use Java Socket with SOCKS proxy to connect on Tor (I am using Orbot and Tor service is running on port 9050 ).
I got the error :
I/System.out: java.net.UnknownHostException: Host is unresolved: 3g2upl4pq6kufc4m.onion
My code is as follow :
// setup proxy
address = new InetSocketAddress('localhost', 9050);
proxy = new java.net.Proxy(java.net.Proxy.Type.SOCKS,address);
// setup socket
client = new Socket(proxy);
inet = new InetSocketAddress("3g2upl4pq6kufc4m.onion", 80);
// connect
client.connect(inet);
This is legitimate, as Android will probably perform DNS resolution via DNS server specified in network configuration and the resolution of onion address will not work.
How do I specify to let Tor service to perform the DNS resolution (Tor will normally handle the hostname from the TCP packet) ?
The correct way of doing this is to use InetSocketAddress.createUnresolved(...) method but this throws an exception on Android.
As a work around we need to implement Socks ourselves like here: http://www.mit.edu/~foley/TinFoil/src/tinfoil/TorLib.java
An explanation is here: https://github.com/acomminos/OnionKit/blob/master/libnetcipher/src/info/guardianproject/onionkit/proxy/SocksProxyClientConnOperator.java
Basically:
socket = new Socket();
socket.setSoTimeout(READ_TIMEOUT_MILLISECONDS);
socket.connect(new InetSocketAddress(mProxyHost, mProxyPort), CONNECT_TIMEOUT_MILLISECONDS);
DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
outputStream.write((byte)0x04);
outputStream.write((byte)0x01);
outputStream.writeShort((short)port);
outputStream.writeInt(0x01);
outputStream.write((byte)0x00);
outputStream.write(host.getBytes());
outputStream.write((byte)0x00);
DataInputStream inputStream = new DataInputStream(socket.getInputStream());
if (inputStream.readByte() != (byte)0x00 || inputStream.readByte() != (byte)0x5a) {
throw new IOException("SOCKS4a connect failed");
}
inputStream.readShort();
inputStream.readInt();
//socket is ready to use
You should pass unresolved socket to Orbot library. It should be created like this:
InetSocketAddress unresolvedRemote = InetSocketAddress.
createUnresolved(host.getHostName(), remoteAddress.getPort());
By the way, if you use apache's httpClient, you can find a sample here.
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