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#!/usr/bin/env bash
#
# Copyright 2022 David Vazgenovich Shakaryan
#
# LINODE_TOKEN=<token> linode-ddns.sh <domain>
IP_RESOLVER='https://ifconfig.co'
TARGET="${1}"
shopt -s extglob
die() {
[[ -n "${@}" ]] && echo "${@}" >&2
exit 1
}
lincurl() {
curl -sfH "Authorization: Bearer ${LINODE_TOKEN}" \
"https://api.linode.com/v4/domains/${1}" \
"${@:2}"
}
ip="$(curl -sf4 "${IP_RESOLVER}")" || die 'IP lookup failed'
dom_re="${TARGET}"
while [[ "${dom_re}" =~ ^([^\\]*)\.(.*)$ ]]; do
dom_re="(${BASH_REMATCH[1]}\\.)?${BASH_REMATCH[2]}"
done
res="$(lincurl)" || die 'Domains lookup failed'
IFS='|' read dom_id dom_name < <(jq -er --arg re "${dom_re}" \
'[.data[] | select(.domain | test("\\A" + $re + "\\z"))] |
if . == [] then (null | halt_error) else . end |
max_by(.domain | length) | [.id, .domain] | join("|")' \
<<< "${res}") || die 'Domain not found'
rec_name="${TARGET%%?(.)${dom_name}}"
res=$(lincurl "${dom_id}/records") || die 'Records lookup failed'
rec_id="$(jq -er --arg name "${rec_name}" \
'first(.data[] | select(.type == "A" and .name == $name)) | .id' \
<<< "${res}")" || die 'Record not found'
res="$(lincurl "${dom_id}/records/${rec_id}")" || die 'Record lookup failed'
old_ip="$(jq -r '.target' <<< "${res}")"
if [[ "${old_ip}" == "${ip}" ]]; then
echo "IP unchanged from ${ip}"
exit
fi
res="$(lincurl "${dom_id}/records/${rec_id}" \
-H 'Content-Type: application/json' \
-X PUT -d "{\"target\":\"${ip}\"}")" || die 'Record update failed'
new_ip="$(jq -r '.target' <<< "${res}")"
echo "IP changed from ${old_ip} to ${new_ip}"
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