160 lines
3.3 KiB
Bash
Executable file
160 lines
3.3 KiB
Bash
Executable file
#!/bin/bash
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##
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# SDDNS update script
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#
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# @copyright 2021, Steffen Vogel
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# @license http://www.gnu.org/licenses/gpl.txt GNU Public License
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# @author Steffen Vogel <post@steffenvogel.de>
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# @link https://www.steffenvogel.de
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##
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# default options
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VER=4
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TTL=120
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USER=anonymous
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ZONE=0l.de
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HOST=$(hostname)
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function usage {
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cat <<-EOF
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Usage: sddns.sh [-4,-6] [-p PASS] [-t TTL] [-i IF] [-z ZONE] [-d] [-D] [HOST]
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Options:
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-u optional user for admin permissions
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-p is the password from the webservice otherwise prompted
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-t is the time to live in seconds
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-i use the ip from this nic
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-z nameserver zone
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-4 update A record (default)
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-6 update AAAA record
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-D live monitor interface for changing addresses
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-d enable verbose output
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-h show this help
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HOST is the hostname which you want to update
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defaults to the local hostname
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Example: sddns.sh -6 -t 3600 -i eth0 sea
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written by Steffen Vogel <post@steffenvogel.de>
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EOF
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}
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function deps() {
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FAILED=0
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for DEP in $*; do
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if ! which ${DEP} &>/dev/null; then
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echo -e "This script requires ${DEP} to run but it is not installed."
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((FAILED++))
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fi
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done
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return ${FAILED}
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}
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function parse() {
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if [[ $* =~ ${RE} && ${BASH_REMATCH[1]} == "${IF}" ]]; then
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echo ${BASH_REMATCH[2]}
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fi
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}
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function update() {
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RDATA=$1
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TYPE=$2
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WAIT=1
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URL="http://d.0l.de/update.txt?host=${HOST}&zone=${ZONE}&ttl=${TTL}&class=IN&type=${TYPE}&rdata=${RDATA}&debug=${DEBUG}"
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while true; do
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if (( $DEBUG )); then echo "Updating record: ${URL}"; fi
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CODE=$(curl -w %{http_code} -s -o /dev/stderr -u "${USER}:${PASS}" "${URL}") 2>&1
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if [ ${CODE} -eq 0 ]; then
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if (( ${DEBUG} )); then echo "Sleeping for ${WAIT} secs..."; fi
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sleep ${WAIT} # wait until interface is ready
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WAIT=$((${WAIT}*2))
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elif [ ${CODE} -ge 500 ]; then
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if (( ${DEBUG} )); then echo "Request failed. Aborting.."; fi
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return 1
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else
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return 0
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fi
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done
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}
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function get() {
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curl -${VER} -s http://d.0l.de/ip.txt | cut -f 3
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}
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function query() {
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dig $TYPE $HOST.$ZONE @ns0.0l.de +short
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}
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# check dependencies
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if ! deps dig curl ip sed cut; then
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echo -e "Unmet dependencies: Aborting!"
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exit 1
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fi
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# parse arguments
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while getopts "z:p:u:t:i:Dhd46" OPT; do
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case ${OPT} in
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p) PASS=${OPTARG} ;;
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u) USER=${OPTARG} ;;
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t) TTL=${OPTARG} ;;
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4) VER=4 ;;
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6) VER=6 ;;
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i) IF=${OPTARG} ;;
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D) DAEMON=1 ;;
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d) DEBUG=${OPTARG:-5} ;;
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h)
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usage
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exit 0 ;;
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*)
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usage
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exit 1
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esac
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done
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# clear all options and reset the command line
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shift $((OPTIND-1))
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# parsing host
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if [ -n "$1" ]; then
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HOST=$1
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else
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echo -e "missing host"
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exit 1
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fi
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# prompting for password
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if [ -z "${PASS}" ]; then
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read -s -p "password: " PASS
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echo
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fi
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# setup regular expression and record type
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if [ ${VER} -eq 4 ]; then
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RE='^[0-9]+: +([^ ]+) +inet +([^/]+)/([0-9]+) brd [^ ]+ +scope +global'
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TYPE="A"
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else
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RE='^[0-9]+: +([^ ]+) +inet6 +([^/]+)/([0-9]+) +scope +global'
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TYPE="AAAA"
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fi
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# lets go
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if [ -z "${IF}" ]; then
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IP=$(get)
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if [ -n "${IP}" ]; then
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update "${IP}" "${TYPE}" || exit
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else
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echo -e "failed to get ip from net"
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exit 1
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fi
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else
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while read LINE; do
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IP=$(parse ${LINE})
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if [ -n "${IP}" ]; then
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update "${IP}" "${TYPE}" || exit
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fi
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done < <(ip -o -${VER} address show && (( ${DAEMON} )) && ip -o -${VER} monitor address)
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fi
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