We have a small C program that is run by the system at start time (important as this does affect STDIN|OUT|ERR). This C program reads a few variables from the /etc/[url removed, login to view] and then uses these variables to craft an SSH cmd with appropriate parameters. The SSH connects out to an SSHD server and sets up a few portforwarding tunnels. The program works admirably for this.
We need to extend this program so that i can read the STDERR and react. In particular, three errors that would normaly be "warnings" from the ssh program we would like to make "fatal". Such that if the program reads any of the following three errors it would simply kill the ssh program and exit.
bind: Address already in use
Could not request local forwarding.
channel_setup_fwd_listener: cannot listen to port: XXXX
Included in the attached zip file:
vpn.c is the actual c program we run
[url removed, login to view] is the example of the config file variables it reads.
*note* the ssh accounts use public key authentication so no passwords are exchanged.
Also, the program _MUST_ be verfied to run in the background as kicked off at startup script or from a cron job. We have had this developed as a foreground application in the past only to have it fail the minute you try to run it from the background with no controlling tty.
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