Re: [JSch-users] Doc and command su

[Stephen W. <swi...@cu...>]

Perhaps you need to set pty? As in:

   ((ChannelShell) channel).setPtyType("dumb");

--Steve

On 4/28/2010 9:01 AM, Keith Alan Richardson wrote:
> Here is example code.  Tested against Linux run OpenSSH.
>
> @ Ehud, I wasn't able to get it to work with openChannel("session").
> Any ideas why?
>
>
>
> import java.io.InputStream;
> import java.io.PipedInputStream;
> import java.io.PipedOutputStream;
>
> import com.jcraft.jsch.Channel;
> import com.jcraft.jsch.JSch;
> import com.jcraft.jsch.Session;
>
> public class SuExample {
> 	public static void main(String[] arg) throws Exception {
> 		JSch jsch = new JSch();
>
> 		String host = "host";
> 		// user we intially connect as
> 		String user1 = "user1";
> 		String password1 = "XXXXXXX";
>
> 		// user we want to su - to.
> 		String user2 = "user2";
> 		String password2 = "YYYYYYY";
>
> 		Session session = jsch.getSession(user1, host, 22);
> 		session.setConfig("StrictHostKeyChecking", "no");
>
> 		session.setPassword(password1);
> 		session.connect();
>
> 		Channel channel = session.openChannel("shell");
>
> 		// create the IO streams to send input to remote session.
> 		PipedOutputStream commandIO = new PipedOutputStream();
> 		InputStream sessionInput = new PipedInputStream(commandIO);
> 		// this set's the InputStream the remote server will read from.
> 		channel.setInputStream(sessionInput);
>
> 		// this will have the STDOUT from server.
> 		InputStream sessionOutput = channel.getInputStream();
>
> 		// this will have the STDERR from server
> 		InputStream sessionError = channel.getExtInputStream();
>
> 		channel.connect();
>
> 		String command;
> 		command = "su - " + user2 + "\n";
> 		commandIO.write(command.getBytes());
> 		commandIO.flush();
>
> 		// Read input until we get the 'Password:' prompt
> 		byte[] tmp = new byte[1024];
> 		String stdOut = "";
> 		String stdErr = "";
>
> 		int i;
>
> 		while (true) {
> 			if (sessionError.available()>  0) {
> 				i = sessionError.read(tmp, 0, tmp.length);
> 				if (i<  0) {
> 					System.err.println("input stream closed earlier than expected");
> 					System.exit(1);
> 				}
> 				stdErr += new String(tmp, 0, i);
> 			}
>
> 			if (sessionOutput.available()>  0) {
> 				i = sessionOutput.read(tmp, 0, tmp.length);
> 				if (i<  0) {
> 					System.err.println("input stream closed earlier than expected");
> 					System.exit(1);
> 				}
> 				stdOut += new String(tmp, 0, i);
> 			}
>
> 			if (stdOut.contains("assword")) {
> 				break;
> 			}
>
> 			Thread.sleep(1000);
> 		}
> 		command = password2 + "\n";
> 		commandIO.write(command.getBytes());
> 		commandIO.flush();
>
> 		// The rest of the commands are just for dem
>
> 		commandIO.write("whoami\n".getBytes());
> 		commandIO.flush();
>
> 		// logout from user2
> 		commandIO.write("exit\n".getBytes());
> 		commandIO.write("whoami\n".getBytes());
> 		// logout from user1
> 		commandIO.write("exit\n".getBytes());
>
> 		// read and print output.
> 		while ((i = sessionOutput.read(tmp, 0, tmp.length)) != -1) {
> 			System.out.println(new String(tmp, 0, i));
> 		}
>
> 		// cleanup.
> 		commandIO.close();
> 		sessionInput.close();
>
> 		channel.disconnect();
> 		session.disconnect();
>
> 	}
>
> }
>
>
> On Tue, Apr 27, 2010 at 3:32 PM, Vivien Duparc<viv...@gm...>  wrote:
>    
>> Is there no way to connect remote host  with a user and when connected made a 'su - user2' command (command that need to give a password) without asking anything to the application user ?
>> I begin to believe it's impossible.
>> Thanks for your help.
>>
>> Le 24 avr. 2010 à 01:47, Keith Alan Richardson<kei...@gm...>  a écrit :
>>
>> There is no documentation.   Look at the examples directory
>>
>> For running commands remotely, even su, look at Exec.java in the examples directory
>>
>> On Apr 23, 2010 2:41 PM, "Vivien Duparc"<viv...@gm...>  wrote:
>>
>> Hi,
>>
>> I'm a new user of api jsch and i have two question please
>>
>> First, is There any doc anywhere ? Or the only help for beginner are
>> examples ?
>>
>> Second, do you know how to execute an su command please ?
>>
>> Thx.
>>
>>
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