check_pf_limits - checks status OpenBSD's PF limits

check_pf_limits needs to run "pfctl -s" so will need permission to
the pf device.  Most likely this means adding something to /etc/sudoers.

For example: 
_nrpe ALL = NOPASSWD:${PREFIX}/libexec/nagios/check_pf_limits -c :90% -l src-nodes -w 10:50%

Currently checked limits are 'states' and 'src-nodes' and whether
PF is enabled.

For more information on pf(4) see the OpenBSD man page.

http://www.openbsd.org

$AFresh1: README,v 1.2 2010/01/14 23:04:38 andrew Exp $