124 lines
2.4 KiB
Bash
124 lines
2.4 KiB
Bash
#!/bin/bash
|
|
##
|
|
# dyndns-update update script
|
|
#
|
|
# @copyright 2021, Steffen Vogel
|
|
# @license http://www.gnu.org/licenses/gpl.txt GNU Public License
|
|
# @author Steffen Vogel <post@steffenvogel.de>
|
|
# @link https://www.steffenvogel.de
|
|
##
|
|
|
|
# default options
|
|
VER=4
|
|
SECRET=bx8qNQAnGic9OnFuqQu9XjG2NS9ed1fOaDds53R2jbq59m1WKWH3Rd1S3nijZ87u
|
|
ZONE=dyn.0l.de
|
|
HOST=$(hostname)
|
|
|
|
function usage {
|
|
cat <<-EOF
|
|
Usage: $0 [-4,-6] [-s SECRET] [-z ZONE] [-d] [-D] [HOST]
|
|
|
|
Options:
|
|
-s is the secret from the webservice otherwise prompted
|
|
-z nameserver zone
|
|
-4 update A record (default)
|
|
-6 update AAAA record
|
|
-D live monitor interface for changing addresses
|
|
-d enable verbose output
|
|
-h show this help
|
|
|
|
HOST is the hostname which you want to update
|
|
defaults to the local hostname
|
|
|
|
Example: $0 -6 -z dyn.0l.de sea
|
|
|
|
written by Steffen Vogel <post@steffenvogel.de>
|
|
EOF
|
|
}
|
|
|
|
function deps() {
|
|
FAILED=0
|
|
for DEP in $*; do
|
|
if ! which ${DEP} &>/dev/null; then
|
|
echo -e "This script requires ${DEP} to run but it is not installed."
|
|
((FAILED++))
|
|
fi
|
|
done
|
|
return ${FAILED}
|
|
}
|
|
|
|
function update() {
|
|
RDATA=$1
|
|
|
|
WAIT=1
|
|
URL="https://dyndns.k8s.0l.de/update?secret=${SECRET}&domain=${HOST}&addr=${RDATA}"
|
|
|
|
while true; do
|
|
if (( $DEBUG )); then echo "Updating record: ${URL}"; fi
|
|
CODE=$(curl -w %{http_code} -s -o /dev/stderr "${URL}") 2>&1
|
|
|
|
if [ ${CODE} -eq 0 ]; then
|
|
if (( ${DEBUG} )); then echo "Sleeping for ${WAIT} secs..."; fi
|
|
sleep ${WAIT} # wait until interface is ready
|
|
WAIT=$((${WAIT}*2))
|
|
elif [ ${CODE} -ge 500 ]; then
|
|
if (( ${DEBUG} )); then echo "Request failed. Aborting.."; fi
|
|
return 1
|
|
else
|
|
return 0
|
|
fi
|
|
done
|
|
}
|
|
|
|
function get() {
|
|
curl -${VER} -s http://ident.me
|
|
}
|
|
|
|
# check dependencies
|
|
if ! deps dig curl ip; then
|
|
echo -e "Unmet dependencies: Aborting!"
|
|
exit 1
|
|
fi
|
|
|
|
# parse arguments
|
|
while getopts "z:p:u:t:i:Dhd46" OPT; do
|
|
case ${OPT} in
|
|
s) SECRET=${OPTARG} ;;
|
|
4) VER=4 ;;
|
|
6) VER=6 ;;
|
|
D) DAEMON=1 ;;
|
|
z) ZONE=${OPTARG} ;;
|
|
d) DEBUG=${OPTARG:-5} ;;
|
|
h)
|
|
usage
|
|
exit 0 ;;
|
|
*)
|
|
usage
|
|
exit 1
|
|
esac
|
|
done
|
|
|
|
# clear all options and reset the command line
|
|
shift $((OPTIND-1))
|
|
|
|
# parsing host
|
|
if [ -n "$1" ]; then
|
|
HOST=$1
|
|
else
|
|
echo -e "missing host"
|
|
exit 1
|
|
fi
|
|
|
|
# prompting for secret
|
|
if [ -z "${SECRET}" ]; then
|
|
read -s -p "secret: " SECRET
|
|
echo
|
|
fi
|
|
|
|
IP=$(get)
|
|
if [ -n "${IP}" ]; then
|
|
update "${IP}" "${TYPE}" || exit
|
|
else
|
|
echo -e "failed to get ip from net"
|
|
exit 1
|
|
fi
|