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Old 13th November 2010
marbi marbi is offline
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Join Date: Nov 2010
Posts: 1
Default Bash and pfctl = problem


I would like to write a script that is able to check if file pf.conf has any errors:

pfctl -n -f pf.conf

- if configuration file is OK there will be no response
- if configuration file in not OK, then some error may come up

syntax error
this one is OK, but neither way Bash can't see it, apart from that, I can't neither take it over nor save it to the file

and simple intruction:
var1=`/sbin/pfctl -n -f /etc/pf.test.conf`
if [ -z "$var1" ]; then
echo OK
echo not OK

But each time the replay is OK, no matter if the configuration file has some errors or doesn't have any.
Therefore, does anybody have any idea how to check if the configuration file is OK and after that, how to transfer the result to Bash script?

Thank you.
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Old 13th November 2010
ohauer ohauer is offline
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Join Date: May 2008
Location: germany
Posts: 32

place the following lines into your ~/.bashrc and you are done

now you can type
# pftest to check if your pf.conf is OK and
# pfinstall to test and install your pf.conf


    pfctl -n -f ${PFCONF} &&
    echo "${PFCONF} => seems to work: $?"
    pfctl -n -f ${PFCONF} &&
    pfctl -f ${PFCONF} &&
    echo "${PFCONF} => seems to work: $?"
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Old 14th November 2010
comet--berkeley comet--berkeley is offline
Real Name: Richard
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Join Date: Apr 2009
Location: California
Posts: 142

Originally Posted by marbi View Post

var1=`/sbin/pfctl -n -f /etc/pf.test.conf`
if [ -z "$var1" ]; then
echo OK
echo not OK
The "trick" is to use the $? variable to capture the return code from the command:

/sbin/pfctl -n -f /etc/pf.conf
if [ $rc -eq 0 ]; then
echo "OK"
echo "not OK"
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