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1 changed files with 80 additions and 63 deletions
143
dyndns.sh
143
dyndns.sh
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@ -1,13 +1,14 @@
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#!/bin/bash
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set -euo pipefail
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api_host="https://api.digitalocean.com/v2"
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sleep_interval=${SLEEP_INTERVAL:-300}
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remove_duplicates=${REMOVE_DUPLICATES:-"false"}
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# Only services with ipv6 supported are listed here.
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services=(
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"ifconfig.co"
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"ipinfo.io/ip"
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"ifconfig.me"
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"ifconfig.io"
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)
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die() {
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@ -22,6 +23,68 @@ test -z $NAME && die "NAME not set!"
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dns_list="$api_host/domains/$DOMAIN/records"
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configure_record() {
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# disable glob expansion
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set -f
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ip=$1
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type=$2
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for sub in ${NAME//;/ }; do
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record_id=$(echo $domain_records| jq ".domain_records[] | select(.type == \"$type\" and .name == \"$sub\") | .id")
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record_data=$(echo $domain_records| jq -r ".domain_records[] | select(.type == \"$type\" and .name == \"$sub\") | .data")
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if [ $(echo "$record_id" | wc -l) -ge 2 ]; then :
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if [[ "${remove_duplicates}" == "true" ]]; then :
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echo "'$sub' domain name has duplicate DNS records, removing duplicates"
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record_id_to_delete=$(echo "$record_id"| tail -n +2)
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record_id=$(echo "$record_id"| head -1)
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record_data=$(echo "$record_data"| head -1)
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while IFS= read -r line; do
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curl -s -X DELETE \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
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"$dns_list/$line" &> /dev/null
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done <<< "$record_id_to_delete"
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else :
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echo "Unable to update '$sub' domain name as it has duplicate DNS records. Set REMOVE_DUPLICATES='true' to remove them."
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continue
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fi
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fi
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# re-enable glob expansion
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set +f
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data="{\"type\": \"A\", \"name\": \"$sub\", \"data\": \"$ip\"}"
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url="$dns_list/$record_id"
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if [[ -z $record_id ]]; then
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echo "No record found with '$sub' domain name. Creating record, sending data=$data to url=$url"
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new_record=$(curl -s -X POST \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
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-d "$data" \
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"$url")
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record_data=$(echo $new_record| jq -r ".data")
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fi
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if [[ "$ip" != "$record_data" ]]; then
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echo "existing DNS record address ($record_data) doesn't match current IP ($ip), sending data=$data to url=$url"
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curl -s -X PUT \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
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-d "$data" \
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"$url" &> /dev/null
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else
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echo "existing DNS record address ($record_data) did not need updating"
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fi
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done
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}
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while ( true ); do
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domain_records=$(curl -s -X GET \
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-H "Content-Type: application/json" \
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@ -31,72 +94,26 @@ while ( true ); do
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for service in ${services[@]}; do
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echo "Trying with $service..."
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ip="$(curl -s $service | grep '[0-9]\{1,3\}\(\.[0-9]\{1,3\}\)\{3\}')"
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test -n "$ip" && break
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ipv4="$(curl -4 -s -f $service)"
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ipv6="$(curl -6 -s -f $service)"
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test -n "$ipv4$ipv6" && break
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done
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echo "Found IP address $ip"
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echo "Found IPv4 address $ipv4"
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echo "Found IPv6 address $ipv6"
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if [[ -n $ip ]]; then
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# disable glob expansion
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set -f
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for sub in ${NAME//;/ }; do
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record_id=$(echo $domain_records| jq ".domain_records[] | select(.type == \"A\" and .name == \"$sub\") | .id")
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record_data=$(echo $domain_records| jq -r ".domain_records[] | select(.type == \"A\" and .name == \"$sub\") | .data")
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if [ $(echo "$record_id" | wc -l) -ge 2 ]; then :
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if [[ "${remove_duplicates}" == "true" ]]; then :
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echo "'$sub' domain name has duplicate DNS records, removing duplicates"
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record_id_to_delete=$(echo "$record_id"| tail -n +2)
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record_id=$(echo "$record_id"| head -1)
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record_data=$(echo "$record_data"| head -1)
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while IFS= read -r line; do
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curl -s -X DELETE \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
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"$dns_list/$line" &> /dev/null
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done <<< "$record_id_to_delete"
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else :
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echo "Unable to update '$sub' domain name as it has duplicate DNS records. Set REMOVE_DUPLICATES='true' to remove them."
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continue
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fi
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fi
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# re-enable glob expansion
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set +f
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data="{\"type\": \"A\", \"name\": \"$sub\", \"data\": \"$ip\"}"
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url="$dns_list/$record_id"
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if [[ -z $record_id ]]; then
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echo "No record found with '$sub' domain name. Creating record, sending data=$data to url=$url"
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new_record=$(curl -s -X POST \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
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-d "$data" \
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"$url")
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record_data=$(echo $new_record| jq -r ".data")
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fi
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if [[ "$ip" != "$record_data" ]]; then
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echo "existing DNS record address ($record_data) doesn't match current IP ($ip), sending data=$data to url=$url"
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curl -s -X PUT \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer $DIGITALOCEAN_TOKEN" \
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-d "$data" \
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"$url" &> /dev/null
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else
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echo "existing DNS record address ($record_data) did not need updating"
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fi
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done
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if [[ -z $ipv4 ]]; then
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echo "IPv4 wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
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else
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echo "IP wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
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configure_record $ipv4 "A"
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fi
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if [[ -z $ipv6 ]]; then
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echo "IPv6 wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
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else
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configure_record $ipv6 "AAAA"
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fi
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sleep $sleep_interval
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done
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