133 lines
3.8 KiB
Bash
Executable file
133 lines
3.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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# vim: set filetype=sh
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set -euo pipefail
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api_host="https://api.dnsimple.com/v2"
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sleep_interval=${SLEEP_INTERVAL:-300}
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remove_duplicates=${REMOVE_DUPLICATES:-"false"}
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record_ttl=${RECORD_TTL:-300}
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# Only services with ipv6 supported are listed here.
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# And are not using cloudflare or similar services
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# that may block requests from this script.
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services=(
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"ifconfig.io"
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)
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info() {
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echo "INFO: $1"
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}
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warn() {
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echo "WARN: $1"
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}
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error() {
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warn "$1"
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exit 1
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}
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test -z "${DNSIMPLE_TOKEN}" && error "DNSIMPLE_TOKEN not set!"
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test -z "${DNSIMPLE_ACCOUNT_ID}" && error "DNSIMPLE_ACCOUNT_ID not set!"
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test -z "${DOMAIN}" && error "DOMAIN not set!"
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test -z "${NAME}" && error "NAME not set!"
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dns_list="$api_host/$DNSIMPLE_ACCOUNT_ID/zones/$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 "$domain_records" | jq ".data[] | select(.type == \"$type\" and .content == \"$sub\") | .id")
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record_data=$(echo "$domain_records" | jq -r ".data[] | select(.type == \"$type\" and .content == \"$sub\") | .content")
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if [ "$(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 $DNSIMPLE_TOKEN" \
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"$dns_list/$line" &>/dev/null
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done <<<"$record_id_to_delete"
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else
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warn "Unable to update '$sub' domain name as it has duplicate DNS records. Set REMOVE_DUPLICATES='true' to remove them."
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continue
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fi
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fi
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# re-enable glob expansion
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set +f
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data="{\"type\": \"$type\", \"name\": \"$sub\", \"content\": \"$ip\", \"ttl\": $record_ttl}"
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url="$dns_list/$record_id"
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if [[ -z $record_id ]]; then
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info "No record found with '$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 $DNSIMPLE_TOKEN" \
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-d "$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" != "$record_data" ]]; then
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info "existing DNS record address ($record_data) doesn't match current IP ($ip), sending data=$data to url=$url"
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curl -s -X PATCH \
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-H "Content-Type: application/json" \
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-H "Authorization: Bearer $DNSIMPLE_TOKEN" \
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-d "$data" \
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"$url" &>/dev/null
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else
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info "existing DNS record address ($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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-H "Authorization: Bearer $DNSIMPLE_TOKEN" \
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"$dns_list")
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for service in "${services[@]}"; do
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info "Trying with $service..."
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ipv4="$(curl -4 -s -f --connect-timeout 2 "$service" || echo "")"
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ipv6="$(curl -6 -s -f --connect-timeout 2 "$service" || echo "")"
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if [[ -n "$ipv4$ipv6" ]]; then
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break
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else
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warn "Failed to retrieve IP from $service"
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fi
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done
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if [[ -z $ipv4 ]]; then
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warn "IPv4 wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
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else
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info "Found IPv4 address $ipv4"
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configure_record "$ipv4" "A"
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fi
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if [[ -z $ipv6 ]]; then
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warn "IPv6 wasn't retrieved within allowed interval. Will try $sleep_interval seconds later.."
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else
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info "Found IPv6 address $ipv6"
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configure_record "$ipv6" "AAAA"
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fi
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sleep "$sleep_interval"
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done
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