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08.18.2008 at 08:22AM PDT, ID: 23656662
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5.8

How can I get command output from j2ssh client ?

Asked by leydent in SSH / Telnet Software, Miscellaneous Programming, Miscellaneous Security

Tags: ,

Hello,

I am writing a j2ssh client which reads scripts to be run via ssh for health checks etc.  I have an SSHWrapper class which looks after connetion, authetication etc and also have an execute_command function which is to be user to pass commands to the ssh server and cache the response.  The problem is the authentication works fine,  however when I pass a simple command such as ls -ltr to server,  I get ni response.  Please see all code and output below.  Any help greatly appreciated.  ThanksStart Free Trial 
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package com;
 
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
 
public class SshExample {
	
 
	
	  public static void main(String args[]) {
 
		  
		  		SSHWrapper ssh = new SSHWrapper();
		  		ssh.hostprompt="";
		  		ssh.hostname="iechbe15";
		  		ssh.username="tibco";
		  		ssh.password="eaiprd00";
		  		ssh.connect();
		  		ssh.execute_command("ls -ltr\n");
		  		
		  		ssh.disconnect();
		  		
		  
		  		
		    	
				return;
				
	    	
	  }	
 
}
 
 
 
package com;
 
import com.sshtools.j2ssh.SshClient; 
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import com.sshtools.j2ssh.authentication.AuthenticationProtocolState;   
import com.sshtools.j2ssh.authentication.PasswordAuthenticationClient;  
import com.sshtools.j2ssh.session.SessionChannelClient;
 
public class SSHWrapper {
	
 
	  String hostname;
	  String hostprompt;
	  String username;
	  String password;
	  String response;
   	  SshClient ssh;
   	  SessionChannelClient session;
   	  
   	// A buffered reader so we can request information from the user
	  private static BufferedReader reader =
	        new BufferedReader(new InputStreamReader(System.in));
 
	SSHWrapper(){
		hostname="";
		username="";
		password="";
		
	}
 
	
	  public String  connect() {
 
		  String return_value="";
		  String command = "ls -ltr\n";
		  int result=0;
		  boolean prompt_returned=false;
		  
		  try {
 
	    	// Create the new  client 
			ssh = new SshClient();
			return_value="created connection successfuly...";
 
			//connect to the host
	    	ssh.connect(hostname);	   
			return_value="Connected to " + hostname + "successfully...";
 
			/** 
	    	  * Create a PasswordAuthenticationClient instance, set the properties
	    	  * and pass to the SessionClient to authenticate
	    	  */
	    	  PasswordAuthenticationClient pwd = new PasswordAuthenticationClient();
	    	  
	    	  pwd.setUsername(this.username);
	    	  pwd.setPassword(this.password);
	    	
	    	  result = ssh.authenticate(pwd);
	    	  return_value = "Login result = " + result;
	    	  
	    	  if(result==AuthenticationProtocolState.FAILED)
	    		     return_value = "The authentication failed";
 
    		  if(result==AuthenticationProtocolState.PARTIAL)
    			  return_value = "The authentication succeeded but another"
	    			                   + "authentication is required";
 
    		  if(result==AuthenticationProtocolState.COMPLETE)
    			  return_value = "The authentication is complete";
    		  
    		  session = ssh.openSessionChannel();
    		  return_value = "session is open successfully...";
    		  
    		  session.requestPseudoTerminal("vt100", 80, 25, 0, 0 , "");
    		  session.startShell();
 
    		  
    		  return_value = "shell started successfully...";
 
    		  
    		  return return_value;
	    	
		} catch(Exception e) {
	      return_value = return_value + "   " + e.getStackTrace();
	      return return_value;
	    }
	  }	
 
	  
	  
	  public String  disconnect() {
 
		  String return_value="";
		  
		  try {
 
	    	// Create the new  client 
    		session.close();
    		reader.close();
    		return_value = "Session closed successfully...";
    		  
    		  return return_value;
	    	
		} catch(Exception e) {
			return_value = return_value + "   " + e.getStackTrace();
			return return_value;
	    }
	  }	
	  
 
	  public String  execute_command(String command ) {
 
		  String return_value="";
		  boolean prompt_returned=false;
		  
		  try {
 
			  response = "";
			  return_value = "Executing command : " + command;
			  System.out.println(return_value);
			  /** Writing to the session OutputStream */
    		  OutputStream out = session.getOutputStream();
    		  out.write(command.getBytes());
    		  
    		  /**
    		  * Reading from the session InputStream
    		  */
    		  InputStream in = session.getInputStream();
    		  byte buffer[] = new byte[255];
    		  int read;
    		  return_value += " : Response=";
    		  while( prompt_returned==false && (read = in.read(buffer))>0 ) {
    			  System.out.println("prompt_returned="+prompt_returned + " / read=" + read);
    			  prompt_returned=false;
    		     response = new String(buffer, 0, read);
    		     return_value += response.toString();
    		     System.out.println(response);
    		     
    		     if ( response.indexOf(this.hostprompt) >= 0 )
    		    	 prompt_returned=true;
    		     
    		  }
    		  return return_value;
	    	
		} catch(Exception e) {
			return_value = return_value + "   " + e.getStackTrace();
			return return_value;
	    }
	  }	
 
	  
	public String getpassword() {
		return this.password;
	}
 
	public void setpassword(String input_value) {
		this.password = input_value;
	}
	  
 
	public String gethostname() {
		return this.hostname;
	}
 
	public void sethostname(String input_value) {
		this.hostname = input_value;
	}
 
	public String getusername() {
		return this.username;
	}
 
	public void setusername(String input_value) {
		this.username = input_value;
	}
 
	
	public String gethostprompt() {
		return this.hostprompt;
	}
 
	public void sethostprompt(String input_value) {
		this.hostprompt = input_value;
	}
	
}
 
18-Aug-2008 16:05:23 com.sshtools.j2ssh.transport.publickey.SshKeyPairFactory <clinit>
INFO: Loading public key algorithms
18-Aug-2008 16:05:24 com.sshtools.j2ssh.configuration.ConfigurationLoader initialize
INFO: JAVA version is 1.5.0_06
18-Aug-2008 16:05:24 com.sshtools.j2ssh.configuration.ConfigurationLoader initialize
INFO: Extension C:\Sun\AppServer\jdk\jre\lib\ext\dnsns.jar being added to classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.util.ExtensionClassLoader add
INFO: Adding C:\Sun\AppServer\jdk\jre\lib\ext\dnsns.jar to the extension classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.configuration.ConfigurationLoader initialize
INFO: Extension C:\Sun\AppServer\jdk\jre\lib\ext\localedata.jar being added to classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.util.ExtensionClassLoader add
INFO: Adding C:\Sun\AppServer\jdk\jre\lib\ext\localedata.jar to the extension classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.configuration.ConfigurationLoader initialize
INFO: Extension C:\Sun\AppServer\jdk\jre\lib\ext\sunjce_provider.jar being added to classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.util.ExtensionClassLoader add
INFO: Adding C:\Sun\AppServer\jdk\jre\lib\ext\sunjce_provider.jar to the extension classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.configuration.ConfigurationLoader initialize
INFO: Extension C:\Sun\AppServer\jdk\jre\lib\ext\sunpkcs11.jar being added to classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.util.ExtensionClassLoader add
INFO: Adding C:\Sun\AppServer\jdk\jre\lib\ext\sunpkcs11.jar to the extension classpath
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.cipher.SshCipherFactory <clinit>
INFO: Loading supported cipher algorithms
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.kex.SshKeyExchangeFactory <clinit>
INFO: Loading key exchange methods
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.compression.SshCompressionFactory <clinit>
INFO: Loading compression methods
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.hmac.SshHmacFactory <clinit>
INFO: Loading message authentication methods
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.TransportProtocolCommon startTransportProtocol
INFO: Starting transport protocol
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.TransportProtocolCommon run
INFO: Registering transport protocol messages with inputstream
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.TransportProtocolCommon negotiateVersion
INFO: Negotiating protocol version
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.TransportProtocolCommon negotiateVersion
INFO: Protocol negotiation complete
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.TransportProtocolCommon beginKeyExchange
INFO: Starting key exchange
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.kex.DhGroup1Sha1 performClientExchange
INFO: Starting client side key exchange.
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.AbstractKnownHostsKeyVerification verifyHost
INFO: Verifying iechbe15,10.162.123.114 host key
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.TransportProtocolClient verifyHostKey
INFO: The host key signature is  valid
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.TransportProtocolCommon completeKeyExchange
INFO: Completing key exchange
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.cipher.SshCipherFactory newInstance
INFO: Creating new blowfish-cbc cipher instance
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.cipher.SshCipherFactory newInstance
INFO: Creating new blowfish-cbc cipher instance
18-Aug-2008 16:05:24 com.sshtools.j2ssh.connection.ConnectionProtocol onServiceInit
INFO: Registering connection protocol messages
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.Service start
INFO: ssh-connection has been requested
18-Aug-2008 16:05:24 com.sshtools.j2ssh.transport.AsyncService onStart
INFO: Starting ssh-connection service thread
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol openChannel
INFO: Channel 0 is open [session]
18-Aug-2008 16:05:25 com.sshtools.j2ssh.session.SessionChannelClient requestPseudoTerminal
INFO: Requesting pseudo terminal
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol sendChannelRequest
INFO: Sending pty-req request for the session channel
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol sendChannelRequest
INFO: Waiting for channel request reply
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol sendChannelRequest
INFO: Channel request succeeded
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol sendChannelRequest
INFO: Sending shell request for the session channel
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol sendChannelRequest
INFO: Waiting for channel request reply
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol sendChannelRequest
INFO: Channel request succeeded
Executing command : ls -ltr
 
prompt_returned=false / read=146
Last   successful login for tibco: Mon Aug 18 16:04:59 GMT0BST 2008  
Last unsuccessful login for tibco: Tue Aug 12 09:23:15 GMT0BST 2008      
 
18-Aug-2008 16:05:25 com.sshtools.j2ssh.connection.ConnectionProtocol closeChannel
INFO: Local computer has closed channel 0[session]
 
Keywords: How can I get command output from j2…
Title
1 SSH in python
2 ls *
3 SSH with Public Key
4 ls command
5 RDIST over SSH
6 ls command
 
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[+][-]08.19.2008 at 08:58PM PDT, ID: 22266017

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[+][-]08.22.2008 at 03:22PM PDT, ID: 22294559

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[+][-]08.24.2008 at 06:54AM PDT, ID: 22300680

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[+][-]08.26.2008 at 02:47AM PDT, ID: 22312883

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About this solution

Zones: SSH / Telnet Software, Miscellaneous Programming, Miscellaneous Security
Tags: j2ee, ie 6
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Solution Provided By: leydent
Participating Experts: 0
Solution Grade: A
 
 
 
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