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#!/bin/sh
#
# Hetzner DNS A record updater (one-shot for cron)
#
# Intended to be run every minute via cron wrapped in:
# logto /var/log/hetzner_ddns /usr/local/bin/hetzner_ddns.sh
#
# Responsibilities:
# 1. Determine current IPv4 address from a specified interface (command).
# 2. Fetch existing DNS record value from Hetzner.
# 3. If different, issue PUT to update record; otherwise exit quietly.
#
# Exits:
# 0 = Successfully updated or already up-to-date.
# 1 = Transient issue (e.g., no local IP yet, API/network error).
# 2 = Permanent-ish configuration problem (e.g., missing token).
#
# Requirements:
# - curl
# - A file /usr/local/etc/hetzner_auth containing ONLY the API token.
#
# If you ever need to change the interface command, expose a variable
# and adapt IFACE_CMD below in the template.
set -eu
# ---------------------------- Configuration ---------------------------------
API_TOKEN_FILE="/usr/local/etc/hetzner_auth"
API_BASE="https://dns.hetzner.com/api/v1"
ZONE_ID="{{ hetzner_zone_id }}"
RECORD_ID="{{ hetzner_record_id }}"
RECORD_NAME="pursotin"
RECORD_TYPE="A"
TTL="300"
IFACE_CMD="jexec ingress ifconfig epw1b"
# ---------------------------------------------------------------------------
fail() {
echo "ERROR: $*" >&2
exit 1
}
warn() {
echo "WARN: $*" >&2
}
info() {
echo "INFO: $*"
}
# Read token
if [ ! -r "${API_TOKEN_FILE}" ]; then
fail "Token file missing or unreadable: ${API_TOKEN_FILE}"
fi
API_TOKEN="$(cat "${API_TOKEN_FILE}" | tr -d '[:space:]')"
[ -n "${API_TOKEN}" ] || fail "API token is empty"
# Get current IPv4 from interface output
get_local_ip() {
# Extract the first 'inet ' IPv4 (ignoring inet6)
sh -c "${IFACE_CMD}" 2>/dev/null | awk '/inet[[:space:]]/ {print $2; exit}'
}
LOCAL_IP="$(get_local_ip || true)"
if [ -z "${LOCAL_IP}" ]; then
warn "No IPv4 address found via '${IFACE_CMD}' (interface not ready?)"
exit 1
fi
# Fetch current DNS record value
fetch_record_ip() {
# We ONLY need the "value" field. Avoid jq dependency; use awk.
# Response shape (simplified):
# {"record":{"id":"...","value":"198.51.100.7", ...}}
curl -sS -H "Auth-API-Token: ${API_TOKEN}" \
"${API_BASE}/records/${RECORD_ID}" \
| awk -F'"' '/"value":"/ {print $4; exit}'
}
REMOTE_IP="$(fetch_record_ip || true)"
if [ -z "${REMOTE_IP}" ]; then
warn "Failed to parse remote record value (network/API issue?)"
exit 1
fi
if [ "${REMOTE_IP}" = "${LOCAL_IP}" ]; then
info "No change (${LOCAL_IP})"
exit 0
fi
# Prepare JSON body (avoid subshell harm by using printf for escaping basics)
BODY=$(printf '{"type":"%s","name":"%s","value":"%s","zone_id":"%s","ttl":%s}' \
"${RECORD_TYPE}" "${RECORD_NAME}" "${LOCAL_IP}" "${ZONE_ID}" "${TTL}")
HTTP_CODE=$(
curl -sS -o /dev/null -w "%{http_code}" -X PUT \
-H "Content-Type: application/json" \
-H "Auth-API-Token: ${API_TOKEN}" \
--data "${BODY}" \
"${API_BASE}/records/${RECORD_ID}"
)
case "${HTTP_CODE}" in
200)
info "Updated ${RECORD_NAME} ${REMOTE_IP} -> ${LOCAL_IP}"
exit 0
;;
4*)
fail "Client error from API (HTTP ${HTTP_CODE}) - check IDs/token/body"
;;
5*)
warn "Server error from API (HTTP ${HTTP_CODE})"
exit 1
;;
*)
warn "Unexpected HTTP status ${HTTP_CODE}"
exit 1
;;
esac
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