#!/bin/bash
#
# opendkim    Start and stop OpenDKIM.

# OpenDKIM startup script for Slackware 14.1 by Gerardo Zamudio
# Modified from the  script by Steve Jenkins (SteveJenkins.com) - 10-29-2012
# Based on a script by Andrew Colin Kissa (TopDog) for dkim-milter - 05-28-2009

USER="opendkim"
PROGRAM=/usr/sbin/opendkim
CONF_FILE=/etc/opendkim.conf
PID_FILE=/var/run/opendkim/opendkim.pid
KEYGEN=/usr/sbin/opendkim-genkey
DKIM_KEYDIR=/etc/opendkim/keys
DKIM_SELECTOR=default
AUTOCREATE_DKIM_KEYS=yes

do_dkim_keygen() {
        if [ ! -s $DKIM_KEYDIR/$DKIM_SELECTOR.private ]; then
                echo -n $"Generating default DKIM keys: "
                if [ "x$(hostname -d)" = "x" ]; then
                        echo $"Cannot determine host's domain name, so skipping default key generation."
                else
                        mkdir -p $DKIM_KEYDIR
                        $KEYGEN -b 2048 -D $DKIM_KEYDIR -s $DKIM_SELECTOR -d "$(hostname -d)"
                        chown root:$USER $DKIM_KEYDIR
                        chown $USER:$USER $DKIM_KEYDIR/$DKIM_SELECTOR.{private,txt}
                        chmod 600 $DKIM_KEYDIR/$DKIM_SELECTOR.private
                        chmod 644 $DKIM_KEYDIR/$DKIM_SELECTOR.txt
                        echo
                        echo Default DKIM keys for "$(hostname -d)" created in $DKIM_KEYDIR.
                fi
        fi
}

case "$1" in
  start)
        # Create keys if necessary
        if [ "x${AUTOCREATE_DKIM_KEYS}" != xNO ]; then
                do_dkim_keygen
        fi

        echo -n $"Starting OpenDKIM Milter... "
        echo
        if [ -f $PID_FILE ]; then
                PID=$(cat $PID_FILE)
                echo OpenDKIM already running as pid "$PID"
                exit 2;
        else
                $PROGRAM -l -x $CONF_FILE -P $PID_FILE
        fi
        ;;
  stop)
		echo -n $"Stopping OpenDKIM Milter... "
        echo
        if [ ! -f $PID_FILE ]; then
                echo OpenDKIM is not running!
                exit 2;
        else
				kill -TERM "$(cat $PID_FILE)" && rm -rf /var/run/opendkim.pid
		fi
        ;;
  status)
        if [ -f $PID_FILE ]; then
                PID=$(cat $PID_FILE)
                echo OpenDKIM already running as pid "$PID"
                exit 2;
        else
                echo OpenDKIM is not running!
        fi
        ;;
  *)
        echo $"Usage: $0 {start|stop|status|}"
        exit 1
esac

exit $?