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#!/bin/sh
# Work with DigitalOcean api to update "A" and "AAAA" records for a domain.
# Store DigitalOcean API token in file : DIGITALOCEAN_TOKEN
# Store domain to be updated in file : DIGITALOCEAN_DOMAIN
ip_version="$1"
if [ -z "${ip_version:-}" ] || ([ "$ip_version" != 4 ] && [ "$ip_version" != 6 ]); then
echo "Error: no valid IP version provided" >&2
echo "Usage: dyndns.bash <4|6> [domain]" >&2
exit 1
fi
SCRIPT="$0"
SCRIPT_DIR=$(cd "${SCRIPT%/*}" && pwd )
SCRIPT_NAME=${SCRIPT##*/}
IP="$($SCRIPT_DIR/get_ip_addr.sh $ip_version)"
if [ -z "$IP" ]; then
echo "Error: could not find IP address" >&2
exit 1
fi
DIGITALOCEAN_TOKEN=`cat $SCRIPT_DIR/DIGITALOCEAN_TOKEN`
DOMAIN=${2:-`cat $SCRIPT_DIR/DIGITALOCEAN_DOMAIN`}
SUBDOMAIN=`echo $DOMAIN | sed "s/[^.]\+\.[^.]\+$//g"`
if [ -z "$SUBDOMAIN" ]; then
SUBDOMAIN="@"
ROOT_DOMAIN=$DOMAIN
else
SUBDOMAIN=`echo $SUBDOMAIN | sed "s/\.$//g"`
ROOT_DOMAIN=`echo $DOMAIN | sed "s/^${SUBDOMAIN}\.//g"`
fi
REPEAT_CHECK_DIR=$SCRIPT_DIR
REPEAT_CHECK_A=$REPEAT_CHECK_DIR/REPEAT_CHECK_${DOMAIN}_A
REPEAT_CHECK_AAAA=$REPEAT_CHECK_DIR/REPEAT_CHECK_${DOMAIN}_AAAA
REPEAT_CHECK="$([ $ip_version = 4 ] && echo $REPEAT_CHECK_A || echo $REPEAT_CHECK_AAAA)"
get_a_record_ids() {
curl -X GET \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
"https://api.digitalocean.com/v2/domains/$ROOT_DOMAIN/records" 2> /dev/null | jq '.domain_records | map(select(.type == "A" and .name == "$SUBDOMAIN")) | map(.id) | .[]'
}
get_aaaa_record_ids() {
curl -X GET \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
"https://api.digitalocean.com/v2/domains/$ROOT_DOMAIN/records" 2> /dev/null | jq '.domain_records | map(select(.type == "AAAA" and .name == "$SUBDOMAIN")) | map(.id) | .[]'
}
add_a_record() {
curl -X POST \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
-d "{\"type\":\"A\" \
,\"name\":\"$SUBDOMAIN\" \
,\"data\":\"$IP\" \
,\"priority\":null \
,\"port\":null \
,\"ttl\":1800 \
,\"weight\":null \
,\"flags\":null \
,\"tag\":null \
}" \
"https://api.digitalocean.com/v2/domains/$ROOT_DOMAIN/records" 2> /dev/null | jq '.domain_record.id'
}
add_aaaa_record() {
curl -X POST \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
-d "{\"type\":\"AAAA\" \
,\"name\":\"$SUBDOMAIN\" \
,\"data\":\"$IP\" \
,\"priority\":null \
,\"port\":null \
,\"ttl\":1800 \
,\"weight\":null \
,\"flags\":null \
,\"tag\":null \
}" \
"https://api.digitalocean.com/v2/domains/$ROOT_DOMAIN/records" 2> /dev/null | jq '.domain_record.id'
}
delete_record_by_id() {
echo deleting existing A/AAAA record for $DOMAIN
curl -X DELETE \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
"https://api.digitalocean.com/v2/domains/$ROOT_DOMAIN/records/$1" > /dev/null 2>&1
}
replace_a_records() {
for id in `get_a_record_ids`; do
delete_record_by_id $id
done
new_record_id=`add_a_record`
if [ "$new_record_id" = "null" ] ; then
echo unable to add new A record for $DOMAIN with value: $IP
return 1
fi
echo added new A record for $DOMAIN with value: $IP
}
replace_aaaa_records() {
for id in `get_aaaa_record_ids`; do
delete_record_by_id $id
done
new_record_id=`add_aaaa_record`
if [ "$new_record_id" = "null" ] ; then
echo unable to add new AAAA record for $DOMAIN with value: $IP
return 1
fi
echo added new AAAA record for $DOMAIN with value: $IP
}
replace_records() {
[ $ip_version = 4 ] && replace_a_records || replace_aaaa_records
}
# exit if previous successful call was with same argument
if [ -e $REPEAT_CHECK ]; then
PREVIOUS_IP=`cat $REPEAT_CHECK`
if [ "$IP" = "$PREVIOUS_IP" ]; then
echo previous update was also with argument: \"$IP\" so exiting now to avoid duplicate work.
exit
fi
fi
# attempt to replace records and, if successful, save arguments to check against next time
if replace_records $IP; then
# if successful then save arguments.
echo update worked so saving arguments \"$IP\" in $REPEAT_CHECK
mkdir -p $REPEAT_CHECK_DIR
echo "$IP" > $REPEAT_CHECK
fi
|
