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Java Forum / General / May 2006Java Program should open a telnet session and login to Unix server using a valid user id and password
Hi, I wanted to write a Java Program which will login ( using Telnet ) to a Unix Server ( Ex: Solaris, Red Hat Linux) and issue some commands in the Solaris. The Java Program should be written in Windows machine. If the java program is executed, then commands like cat or rm should be executed in the unix server. Any Help ?? Regards, Kiran H Hi, are you sure you actually need /telnet/ to do the job? Will simply opening a socket, and writing the commands to the output stream of that socket, not do? You you really need to go for the external telnet command you should look for the various java.lang.Runtime.exec() methods in the Java API. These allow you to issue an external command. /philipp kiranhiremath@gmail.com schrieb: > Hi, > [quoted text clipped - 10 lines] > Regards, > Kiran H > Hi, > [quoted text clipped - 5 lines] > If the java program is executed, then commands like cat or rm should be > executed in the unix server. - Why do you need to write a program? - Does it have to run a built-in sequence of commands? - Why can't you do the job with a standard telnet client for Windows? The easy way to run commands via Telnet is to use the excellent (and free) PuTTY telnet/ssh client and, if needed, run a shell script on the *NIX system. If you have to write a special-purpose Java client you can use a simple Socket instance to talk to telnetd, the Telnet server. Read RFC 854, available from http://www.ietf.org/rfc.html - I think that's the latest Telnet protocol definition. Be aware, too, that telnet is now deprecated due to insecurity. Use of ssh is preferred. Besides, ssh can forward X.11 sessions, so you can run GUI clients remotely via ssh provided you have an X-server running on your Windows box.  Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | Hi, I have an application which uses JAVA JDK 1.4. I need the Java Program to act as an Unix administrator. i.e the Java program should be able to add, modify, delete users and groups etc in the Unix Server. Anyone has a sample code which will login to Unix machine and execute the commands and get the results back. A Socket program or any such code which can execute Shell commands is OK. Regards, Kiran H > Hi, > [quoted text clipped - 7 lines] > A Socket program or any such code which can execute Shell commands is > OK. As I said, you have to act like a telnetd client: telnetd uses a pseudo tty to simulate a login from a serial device. This login starts a shell to execute your commands. Read the RFC I suggested to find out how to talk to telnetd OR find an open source telnet client and read its source. There are Java implementations: see http://javatelnet.org/space/start Much the same applies to ssh / sshd, i.e. it uses the same pseudo tty mechanism. There are Java implementations for ssh too: see http://www.openssh.com/java.html As for the user maintenance commands, look at the manpages for useradd, userdel and usermod. They are standard for Linux and, IIRC, for SVR4 *NIXen. Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | Thank You all for the reply. I will build upon the sample codes. Regards, Kiran H Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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