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dyndns.sh
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#!/bin/sh
api_host="https://api.digitalocean.com/v2"
sleep_interval=${SLEEP_INTERVAL:-300}
die() {
echo "$1"
exit 1
}
test -z $DIGITALOCEAN_TOKEN && die "DIGITALOCEAN_TOKEN not set!"
test -z $DOMAIN && die "DOMAIN not set!"
test -z $NAME && die "NAME not set!"
dns_list="$api_host/domains/$DOMAIN/records"
while ( true ); do
domain_records=$(curl -s -X GET \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
$dns_list)
record_id=$(echo $domain_records| jq ".domain_records[] | select(.type == \"A\" and .name == \"$NAME\") | .id")
record_data=$(echo $domain_records| jq -r ".domain_records[] | select(.type == \"A\" and .name == \"$NAME\") | .data")
test -z $record_id && die "No record found with given domain name!"
ip="$(curl -s ipinfo.io/ip)"
data="{\"type\": \"A\", \"name\": \"$NAME\", \"data\": \"$ip\"}"
url="$dns_list/$record_id"
if [[ -n $ip ]]; then
if [[ "$ip" != "$record_data" ]]; then
echo "existing DNS record address ($record_data) doesn't match current IP ($ip), sending data=$data to url=$url"
curl -s -X PUT \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
-d "$data" \
"$url" &> /dev/null
fi
else
echo "IP wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
fi
sleep $sleep_interval
done