Thursday, 4 July 2013

Using portmir Command to Monitor a TTY stream

Problem(Abstract)

I Need to monitor commands entered in a remote TTY or PTY session and echo those commands back to the terminal I am currently logged into (or to a file)

Resolving the problem

The portmir command allows one TTY stream (monitor) to attach to another TTY stream (target) and monitor the user session that is taking place on that stream. This is accomplished by pushing a special "mirror" module into both the target and monitor TTY streams.

This type of monitoring can be accomplished with TTY or PTS devices. The following example include the use of the "script" command to collect and store the commands issued on the device being monitored.

1. Look for the user's login device which is to be monitored.

# who -u <enter>
Example: Device to monitor is /dev/pts/3

2. Look for the device you are currently using. This will be the "target" device.

# tty <enter>
Example: Target device is /dev/pts/2

3. In your pts/2 target session, start the script command to record output to the file called "/tmp/portmir.out"

# script /tmp/portmir.out

4. Begin the portmir monitoring

# portmir -t /dev/pts/2 -m /dev/pts/3 <enter>
The -t is for target device. The -m is for the device to be monitored.

5. Break out of script using exit

# exit
View the /tmp/portmir.out file for script output.

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