dhclient-exit-hoot to reconfigure SSHD ListenAddress if IP address changes

dhclient-exit-hook

# Reconfigure SSHD ListenAddress if ip address changes

LOGGER="/usr/bin/logger -s -p user.notice -t dhclient-exit-hook"

old_ip_address=$(sysrc -n sshd_flags | \
                 sed -e 's/.*ListenAddress=\([0-9\.]*\) .*/\1/')

$LOGGER "($reason) SSHD ListenAddress ${old_ip_address} -> ${new_ip_address}"

if [ ! -z "${new_ip_address}" -a "${old_ip_address}" != "${new_ip_address}" ]
then
        sshd_flags=$(sysrc -n sshd_flags | \
                     sed -e "s/\(ListenAddress=\)[0-9\.]*/\1${new_ip_address}/")

        $LOGGER Reconfiguring SSHD flags: \"$sshd_flags\"
        sysrc sshd_flags="$sshd_flags"

        $LOGGER Restarting SSHD
        service sshd restart
fi