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