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linuxsshnetwork-programmingip-address

Find the IP address of the client in an SSH session

I have a script that is to be run by a person that logs in to the server with SSH.

Is there a way to find out automatically what IP address the user is connecting from?

Of course, I could ask the user (it is a tool for programmers, so no problem with that), but it would be cooler if I just found out.

Solution

  • Check if there is an environment variable called:

    $SSH_CLIENT

    OR

    $SSH_CONNECTION

    (or any other environment variables) which gets set when the user logs in. Then process it using the user login script.

    Extract the IP:

    $ echo $SSH_CLIENT | awk '{ print $1}'
1.2.3.4
$ echo $SSH_CONNECTION | awk '{print $1}'
1.2.3.4