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Top Forums Shell Programming and Scripting Triggering a script using POSTFIX.... Post 302995308 by drysdalk on Tuesday 4th of April 2017 10:44:13 AM
Old 04-04-2017
Hi,

This is possible, yes. I've done it myself in the past when this has been absolutely the only way I could remotely trigger something on a system (i.e. when SMTP was the only port a server could take incoming connections on, and so I had to use it as a crude job control method). It's not ideal, and you have to be absolutely sure that things are as locked-down security-wise as you can make them to eliminate this being a potential security hole, but if you really have to/need to, this is do-able.

I did it by having an entry in /etc/aliases for the SMTP username that then forwarded into a local pipe to my script.

So an entry like this in /etc/aliases

Code:
scriptuser: "|/usr/bin/sudo /usr/local/bin/script.sh"

would pipe the full body of any e-mail received for the mailbox scriptuser into the script /usr/local/bin/script.sh, in this instance running it via sudo as well (assuming the script needs root access).

As I say, it's a crude method and you need to be as close to 100% sure as you can be that your script does every possible kind of sanity checking and input sanitising that you can think of. But it should work for you - it certainly has for me in the past, when I've had no other choice but to go down that road.
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INITSCRIPT(5)						Linux System Administrator's Manual					     INITSCRIPT(5)

NAME
initscript - script that executes inittab commands. SYNOPSIS
/bin/sh /etc/initscript id runlevels action process DESCRIPTION
When the shell script /etc/initscript is present, init will use it to execute the commands from inittab. This script can be used to set things like ulimit and umask default values for every process. EXAMPLES
This is a sample initscript, which might be installed on your system as /etc/initscript.sample. # # initscript Executed by init(8) for every program it # wants to spawn like this: # # /bin/sh /etc/initscript <id> <level> <action> <process> # # Set umask to safe level, and enable core dumps. umask 022 ulimit -c 2097151 PATH=/bin:/sbin:/usr/bin:/usr/sbin export PATH # Increase the hard file descriptor limit for all processes # to 8192. The soft limit is still 1024, but any unprivileged # process can increase its soft limit up to the hard limit # with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel). ulimit -Hn 8192 # Execute the program. eval exec "$4" NOTES
This script is not meant as startup script for daemons or somesuch. It has nothing to do with a rc.local style script. It's just a handler for things executed from /etc/inittab. Experimenting with this can make your system un(re)bootable. FILES
/etc/inittab, /etc/initscript. AUTHOR
Miquel van Smoorenburg ,<miquels@cistron.nl> SEE ALSO
init(8), inittab(5). July 10, 2003 INITSCRIPT(5)
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