k7ST2syN

1#!/bin/sh
2
3# interface going down
4if [ "${0#*ip-down.d/}" = "${0##*/}" ]; then
5	exec killall -w "${0##*/}"
6fi
7
8[ "$PPP_IFACE" = 'pppoe-data' ] || exec logger -p daemon.info -t dyndns "Not applying DNS to iface '$PPP_IFACE'"
9
10read domain </proc/sys/kernel/hostname
11
12domain=$domain.example.com
13email=
14key=
15zone=
16api=https://api.cloudflare.com/client/v4/zones/$zone/dns_records
17
18auth="-H X-Auth-Email:$email -H X-Auth-Key:$key"
19
20updatedns() {
21	ret=0
22	if ! id=$(curl -s $auth $api |jq -er ".result[] | select(.name == \"$domain\") | .id"); then
23		return 1
24	fi
25	uri="$api/$id"
26	json=/tmp/dyndns-$$.json
27
28	curl -sS -XPUT $uri $auth \
29		-H 'Content-Type: application/json' \
30		-d "{\"type\":\"A\", \"name\":\"$domain\", \"content\":\"$IPLOCAL\"}" >$json
31	if jq -ec '.success == false' <$json >/dev/null; then
32		logger -p daemon.warning -t dyndns "server returned '$(jq -c .errors <$json)'"
33		ret=1
34	fi
35	rm -f $json
36	return $ret
37}
38
39i=60
40while [ $i -ge 0 ]; do
41	updatedns && exec logger -p daemon.info -t dyndns "DNS for $domain set to $IPLOCAL"
42	sleep 5
43	logger -p daemon.notice -t dyndns "Retry setting DNS for $domain ($i more tries)"
44	i=$((i - 1))
45done &
46
47exit 0