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POImplementing an xmpp client in java - stuck in the first step
 

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    <p>I am trying to write an xmpp client to send/recieve messages from gtalk.</p> <p>Before I actually started with the implementation I thought of developing a prototype to see if I am able to to get a message through to gtalk.</p> <p>I wrote the following code and am now stuck in the part where I am supposed to request google before starting an encrypted connection.</p> <pre><code>import java.io.BufferedReader; import java.io.DataInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.Socket; import java.net.UnknownHostException; public class XmppConnect { static String initiate_conn="&lt;?xml version=\"1.0\"?&gt;\n\r&lt;stream:stream to=\"google.com\"\n\rversion=\"1.0\"\n\rxmlns=\"jabber:client\"\n\rxmlns:stream=\"http://etherx.jabber.org/streams\"&gt;\n"; static String start_tls="&lt;starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/&gt;"; public static void main(String [] args) { try { Socket connection = new Socket("talk.google.com", 5222); DataInputStream input = new DataInputStream(connection.getInputStream()); BufferedReader d = new BufferedReader(new InputStreamReader(input)); OutputStream to_server = null; String responseLine; to_server = connection.getOutputStream(); to_server.write(initiate_conn.getBytes()); responseLine = d.readLine(); System.out.println("Server: " + responseLine); to_server.write(start_tls.getBytes()); responseLine = d.readLine(); System.out.println("Server: " + responseLine); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } </code></pre> <p>I am able to send the following to google</p> <pre><code>&lt;starttls xmlns="urn:ietf:params:xml:ns:xmpp-tls"/&gt; </code></pre> <p>and in reply I expect the following</p> <pre><code>&lt;proceed xmlns="urn:ietf:params:xml:ns:xmpp-tls"/&gt; </code></pre> <p>But I don't get anything back from the server.</p> <p>The screenshot from wireshark is as attached.</p> <p>Request your help and please don't tell me to use already existing xmpp libraries cause I just don't want to.</p> <p>Regards, Manu!</p> <p><img src="https://i.stack.imgur.com/KMreo.png" alt="Screenshot of WireShark"></p> <p><strong><em>Update</em></strong></p> <p>Have found the solution. The working code is as under:</p> <p>The code which works for now is as under.</p> <p>Now I will work on the TLS implementation and get back here incase of any doubts :) :)</p> <pre><code>import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.DataInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.Socket; import java.net.UnknownHostException; public class XmppConnect { static String initiate_conn="&lt;stream:stream to=\"gmail.com\" version=\"1.0\" xmlns=\"jabber:client\" xmlns:stream=\"http://etherx.jabber.org/streams\"&gt;"; static String start_tls="&lt;starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/&gt;"; public static void main(String [] args) { try { Socket connection = new Socket("talk.google.com", 5222); DataInputStream input = new DataInputStream(connection.getInputStream()); BufferedReader d = new BufferedReader(new InputStreamReader(input,"UTF-8")); BufferedWriter to_server = new BufferedWriter( new OutputStreamWriter(connection.getOutputStream(),"UTF-8") ); String responseLine=""; to_server.write(initiate_conn); to_server.flush(); int in; while(!(responseLine.contains("&lt;/stream:features&gt;"))) { responseLine += (char)d.read(); } System.out.println("Server: " + responseLine); to_server.write(start_tls); to_server.flush(); responseLine=""; while(!(responseLine.contains("&lt;proceed xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/&gt;"))) responseLine += (char)d.read(); System.out.println("Server: " + responseLine); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } </code></pre>
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