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Filename : opendkim-default-keygen
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#!/bin/bash

# Create default keys for the OpenDKIM Milter.

# source function library
#. /etc/rc.d/init.d/functions

# Some functions to make the below more readable
prog=opendkim
KEYGEN=/usr/sbin/$prog-genkey
DKIM_SELECTOR=default
DKIM_KEYDIR=/etc/$prog/keys

# Make some colors
red='\033[1;31m'
green='\033[1;32m'
NC='\033[0m' # No Color

# Pull in sysconfig settings (will override previously set functions)
[ -f /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog

do_dkim_keygen() {
        if [ ! -s $DKIM_KEYDIR/$DKIM_SELECTOR.private ]; then
                echo -n $"Generating default DKIM keys: "
                if [ "x`hostname --domain`" = "x" ]; then
                        echo
                        echo -e "${red}Cannot determine host's domain name, so skipping default key generation.${NC}"
                else
                        mkdir -p $DKIM_KEYDIR
                        $KEYGEN -D $DKIM_KEYDIR -s $DKIM_SELECTOR -d `hostname --domain`
                        chown -R root:$prog $DKIM_KEYDIR
                        chmod 640 $DKIM_KEYDIR/$DKIM_SELECTOR.private
                        chmod 644 $DKIM_KEYDIR/$DKIM_SELECTOR.txt
                        echo
                        echo -e "${green}Default DKIM keys for `hostname --domain` created in $DKIM_KEYDIR.${NC}"
                fi
	else
		 echo -e "${red}Default DKIM keys already exist!${NC}"
        fi
}

# Create keys

do_dkim_keygen