Re: POST to secure server

From:
Silvio <silvio@internet.com>
Newsgroups:
comp.lang.java.programmer
Date:
Wed, 27 Mar 2013 15:08:51 +0100
Message-ID:
<5152fd73$0$6939$e4fe514c@news.xs4all.nl>
On 03/27/2013 02:45 PM, RVic wrote:

Thank you. I was thinking I would have to create a socket listener on the server side once I had an ssh connection set up with Jsch. I am looking through the Jsch examples (I am enclosing one in particular caled ViaHTTP) but I cannot, for the life of me, see how I would then perform my Post within that framework? Can you please explain further? Thank you!

     String proxy_host;
     int proxy_port;

     try{
       JSch jsch=new JSch();

       String host=null;
       if(arg.length>0){
         host=arg[0];
       }
       else{
         host=JOptionPane.showInputDialog("Enter username@hostname",
                                          System.getProperty("user.name")+
                                          "@localhost");
       }
       String user=host.substring(0, host.indexOf('@'));
       host=host.substring(host.indexOf('@')+1);

       Session session=jsch.getSession(user, host, 22);

       String proxy=JOptionPane.showInputDialog("Enter proxy server",
                                                  "hostname:port");
       proxy_host=proxy.substring(0, proxy.indexOf(':'));
       proxy_port=Integer.parseInt(proxy.substring(proxy.indexOf(':')+1));

       session.setProxy(new ProxyHTTP(proxy_host, proxy_port));

       // username and password will be given via UserInfo interface.
       UserInfo ui=new MyUserInfo();
       session.setUserInfo(ui);

       session.connect();

       Channel channel=session.openChannel("shell");

       channel.setInputStream(System.in);
       channel.setOutputStream(System.out);

       channel.connect();
     }
     catch(Exception e){
       System.out.println(e);
     }


I am guessing you meant this as a reply to my post...

If you setup a tunnel using JSCH (which requires adding an addition
connection property string to the connection that specifies the server
destination host:port and the local port on the client side then any
communication going through localhost:port on the client will be
tunnelled via SSH and reach the destination host:port on the server side.
So assuming that there is an existing servlet on the server side that is
listening for HTTP requests on port 80 on the same box you make the SSH
connection to you server host:port would be localhost:80 and you could
use any desired port on the client side, lets say 8080. After that you
can use new URL("http://localhost:8080/path/to/the/servlet/") and do a
normal post from the client. The tunnel will automagically make your
request reach the servlet.

Despite what others have said the standard HTTP client in Java works
fine and will probably give you what you need. If the servlet might barf
on the URL because of the localhost:8080 you could even use any
imaginable URL like new URL("http://www.whatever.com/path/to/servlet/")
and use the proxy option of URL#openConnection to get traffic through
localhost:8080.

Good luck,

Silvio

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