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#!/bin/bash
#
# Copyright (C)2019 by Jason D. McCormick <jason@mfamily.org>
# Licensed under the Apache License 2.0. See LICENSE included
# with the distribution bundle that contained this file.
#
PATH="/usr/bin:/bin:/usr/sbin:/sbin"
## KNOWLEDGE IS GOOD ##
usage() { echo "Usage: $0 [-s SECRET] -d HOSTNAME[,HOSTNAME,...]" 1>&2; exit 1; }
## DO THE UPDATE FUNCTION ONCE FOR HAPPY EDITING ##
doUpdate() {
/usr/bin/curl -s$1 "https://$FQDN:$CODE@$DNSSITE/nic/update?hostname=$FQDN" > $tfile
if ! egrep -q '(good|nochg)' $tfile; then
echo -n "v$1 change: "
cat $tfile
echo
retval=1
fi
}
## MAIN ##
while getopts "46hd:s:" arg; do
case "${arg}" in
4)
DO4=Y
;;
6)
DO6=Y
;;
d)
FQDNS=${OPTARG}
;;
s)
CODE=${OPTARG}
;;
*)
usage
;;
esac
done
if [ -z "${FQDNS}" ]; then
usage
fi
if [ ! -f /etc/he-dns-secret ] && [ -z "${CODE}" ]; then
usage
fi
if [ -z "${CODE}" ]; then
. /etc/he-dns-secret
if [ -z "${CODE}" ]; then
echo "/etc/he-dns-secret does not contain a CODE= variable"
exit 1
fi
fi
DNSSITE="dyn.dns.he.net";
retval=0
tfile=$(/bin/mktemp)
for FQDN in $(echo $FQDNS | tr ',' ' ')
do
if [ ! -z ${DO4} ]; then
doUpdate 4
fi
if [ ! -z ${DO6} ]; then
doUpdate 6
fi
done
rm $tfile
exit $retval
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