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#!/usr/bin/env bash |
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# |
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# Glesys dyn dns updater |
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# Ville Alatalo 2025 https://github.com/alatalo |
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# |
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set -euo pipefail |
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# Load env file if exists/defined |
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if [[ -f "${ENV_FILE:-.env}" ]]; then |
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set -o allexport |
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source "${ENV_FILE:-.env}" |
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set +o allexport |
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echo "Loaded environment from ${ENV_FILE:-.env}" |
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fi |
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# Required env vars |
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: "${GLESYS_USER:?GLESYS_USER is required}" |
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: "${GLESYS_APIKEY:?GLESYS_APIKEY is required}" |
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: "${IPINFO_TOKEN:?IPINFO_TOKEN is required}" |
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: "${DOMAIN_NAME:?DOMAIN_NAME is required}" |
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: "${HOST_NAME:?HOST_NAME is required}" |
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# Optional env vars |
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: "${RECORD_TYPE:=A}" |
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: "${RECORD_TTL:=300}" |
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: "${DISCORD_WEBHOOK_URL:=}" |
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: "${FORCE_UPDATE:=false}" |
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for bin in curl jq; do |
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if ! command -v "$bin" >/dev/null 2>&1; then |
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echo "ERROR: missing required command: $bin" >&2 |
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exit 1 |
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fi |
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done |
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CURL_OPTS=( -fsS --connect-timeout 5 --max-time 20 ) |
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FORCE_UPDATE="$(echo "$FORCE_UPDATE" | tr '[:upper:]' '[:lower:]')" |
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# Fetch public IP |
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PUBLIC_IP=$(curl "${CURL_OPTS[@]}" \ |
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-H "Authorization: Bearer $IPINFO_TOKEN" \ |
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-H "Accept: application/json" \ |
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https://api.ipinfo.io/lite/me/ip) |
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echo "Public IP: $PUBLIC_IP" |
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# Get existing DNS records |
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RECORDS=$(curl "${CURL_OPTS[@]}" \ |
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-u "$GLESYS_USER:$GLESYS_APIKEY" \ |
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-H "Content-Type: application/json" \ |
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-X POST \ |
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--data "{ \"domainname\": \"$DOMAIN_NAME\" }" \ |
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https://api.glesys.com/domain/listrecords) |
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# Extract match |
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RECORD_ID=$(echo "$RECORDS" \ |
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| jq -r ".response.records[] | select(.host==\"$HOST_NAME\" and .type==\"$RECORD_TYPE\") | .recordid" \ |
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| head -n1 || true) |
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CURRENT_DATA=$(echo "$RECORDS" \ |
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| jq -r ".response.records[] | select(.recordid==${RECORD_ID:-0}) | .data" \ |
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| head -n1 || true) |
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# No-op if IP is already OK |
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if [[ "$FORCE_UPDATE" != "true" && -n "${RECORD_ID:-}" && "$CURRENT_DATA" == "$PUBLIC_IP" ]]; then |
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echo "Skipping DNS record update, it's already up to date." |
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exit 0 |
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fi |
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if [[ "$FORCE_UPDATE" == "true" ]]; then |
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echo "Force update enabled, updating DNS record." |
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fi |
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# Create or update record |
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if [[ -z "${RECORD_ID:-}" ]]; then |
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echo "Creating DNS record..." |
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curl "${CURL_OPTS[@]}" \ |
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-u "$GLESYS_USER:$GLESYS_APIKEY" \ |
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-H "Content-Type: application/json" \ |
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-X POST \ |
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--data "{ |
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\"domainname\": \"$DOMAIN_NAME\", |
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\"host\": \"$HOST_NAME\", |
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\"type\": \"$RECORD_TYPE\", |
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\"data\": \"$PUBLIC_IP\", |
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\"ttl\": \"$RECORD_TTL\" |
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}" \ |
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https://api.glesys.com/domain/addrecord |
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echo "Created." |
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else |
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echo "Updating DNS record..." |
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curl "${CURL_OPTS[@]}" \ |
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-u "$GLESYS_USER:$GLESYS_APIKEY" \ |
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-H "Content-Type: application/json" \ |
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-X POST \ |
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--data "{ |
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\"recordid\": $RECORD_ID, |
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\"host\": \"$HOST_NAME\", |
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\"type\": \"$RECORD_TYPE\", |
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\"data\": \"$PUBLIC_IP\", |
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\"ttl\": \"$RECORD_TTL\" |
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}" \ |
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https://api.glesys.com/domain/updaterecord |
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echo "Updated." |
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fi |
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# Post to Discord |
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if [[ -n "${DISCORD_WEBHOOK_URL:-}" ]]; then |
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echo "Posting to Discord..." |
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curl "${CURL_OPTS[@]}" \ |
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-H "Content-Type: application/json" \ |
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-X POST \ |
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-d "$(jq -n --arg content "DNS updated, new public IP: $PUBLIC_IP" '{content: $content}')" \ |
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"$DISCORD_WEBHOOK_URL" |
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echo "Posted." |
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fi |
