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Posted to user@commons.apache.org by John Holliday <Jo...@dsiti.qld.gov.au> on 2020/09/21 23:16:58 UTC

[net] Telnet connection to over SSL via Port forwarding proxy

I have a need to connect to a server via telnet via a proxy:

Here is my code:


TelnetClient telnet;

telnet = new TelnetClient();

SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
telnet.setSocketFactory(sslsocketfactory);

Proxy socksProxy  = new Proxy(Proxy.Type.SOCKS, new InetSocketAddress("127.0.0.1", 6600));
telnet.setProxy(socksProxy);

telnet.connect(host, port);


When I run this code, no errors are thrown, but the reader thread blocks. When I debug the program, I noticed that the Telnet negotiation did not fire.
When I debugged a little further, I noticed that when I set the proxy, the code in SocketClient.setProxy() resets the socket client.

I downloaded the Apache code and commented out the line

   /**
     * Sets the proxy for use with all the connections.
     * The proxy is used for connections established after the
     * call to this method.
     *
     * @param proxy the new proxy for connections.
     * @since 3.2
     */
    public void setProxy(Proxy proxy) {
       // setSocketFactory(new DefaultSocketFactory(proxy));
        connProxy = proxy;
    }

My code then works.

Is this a bug, or am I using the TelnetClient incorrectly?

Regards John Holliday

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