135 lines
4.9 KiB
Bash
135 lines
4.9 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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ENV_FILE="/etc/cf-ddns/cf-ddns.env"
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STATE_DIR="/var/lib/cf-ddns"
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API="https://api.cloudflare.com/client/v4"
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log() { logger -t cf-ddns "$*"; echo "[cf-ddns] $*"; }
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fail() { log "ERROR: $*"; exit 1; }
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# --- Load env ---
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[[ -f "$ENV_FILE" ]] || fail "Missing $ENV_FILE"
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# shellcheck disable=SC1090
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source "$ENV_FILE"
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: "${CF_API_TOKEN:?CF_API_TOKEN required in env}"
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: "${CF_PROXIED:=false}"
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: "${CF_TTL:=120}"
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# --- Names from system ---
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CF_RECORD_NAME="$(hostname -f 2>/dev/null || true)"
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CF_SHORT_NAME="$(hostname -s 2>/dev/null || true)"
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CF_ZONE_NAME="$(hostname -d 2>/dev/null || true)"
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[[ -n "$CF_RECORD_NAME" ]] || fail "hostname -s returned empty"
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[[ -n "$CF_ZONE_NAME" ]] || fail "hostname -d returned empty (set a DNS/search domain)"
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# --- short_host(): derive short alias used for the CNAME ---
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short_host() {
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local short_hostname part1 part2 part3 part4 num_parts second_initial transformed_hostname
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short_hostname="$(hostname -s)"
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IFS="-" read -r part1 part2 part3 part4 <<< "$short_hostname"
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num_parts=$(awk -F'-' '{print NF}' <<< "$short_hostname")
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if [ "$num_parts" -eq 4 ]; then
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second_initial=${part2:0:1} # kept in case you want it later
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transformed_hostname="${part2}-${part4}"
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else
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transformed_hostname="$short_hostname"
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fi
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echo "$transformed_hostname"
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}
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SHORT_ALIAS="$(short_host)"
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SHORT_ALIAS_FQDN="${SHORT_ALIAS}.${CF_ZONE_NAME}"
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# Safe filename for state
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safe_name="$(echo "$CF_RECORD_NAME" | tr '/:' '__')"
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LAST_IP_FILE="${STATE_DIR}/last_ipv4_${safe_name}"
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mkdir -p "$STATE_DIR"
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# --- Detect local IPv4 on default route interface ---
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detect_ip() {
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local iface ip
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iface="$(ip route show default 2>/dev/null | awk '/default/ {print $5; exit}')"
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if [[ -z "${iface}" ]]; then
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iface="$(ip -4 route get 1.1.1.1 2>/dev/null | awk '{for (i=1;i<=NF;i++) if ($i=="dev") {print $(i+1); exit}}')"
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fi
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[[ -n "$iface" ]] || fail "Could not detect default route interface"
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ip="$(ip -4 addr show dev "$iface" | awk '/inet / {print $2}' | cut -d/ -f1 | head -n1)"
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[[ -n "$ip" ]] || fail "No IPv4 found on default interface '$iface'"
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echo "$ip"
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}
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current_ip="$(detect_ip)"
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previous_ip="$( [[ -f "$LAST_IP_FILE" ]] && cat "$LAST_IP_FILE" || echo "" )"
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if [[ "$current_ip" == "$previous_ip" && -n "$current_ip" ]]; then
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log "IP unchanged ($current_ip); no update needed for ${CF_RECORD_NAME}."
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exit 0
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fi
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# --- Cloudflare helpers ---
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urlenc() { local s="$1"; s="${s// /%20}"; s="${s//\//%2F}"; echo -n "$s"; }
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hdr=(-H "Authorization: Bearer ${CF_API_TOKEN}" -H "Content-Type: application/json")
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# 1) Get Zone ID
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zone_q="name=$(urlenc "$CF_ZONE_NAME")"
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zone_id="$(curl -fsS "${hdr[@]}" "${API}/zones?${zone_q}" \
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| sed -n 's/.*"id":"\([^"]*\)".*"name":"'"$CF_ZONE_NAME"'".*/\1/p' | head -n1)"
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[[ -n "$zone_id" ]] || fail "Could not find Zone ID for ${CF_ZONE_NAME}"
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# 2) Lookup existing A record by FQDN
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rec_q="type=A&name=$(urlenc "$CF_RECORD_NAME")"
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record_json="$(curl -fsS "${hdr[@]}" "${API}/zones/${zone_id}/dns_records?${rec_q}")"
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record_id="$(echo "$record_json" | sed -n 's/.*"id":"\([^"]*\)".*"name":"'"$CF_RECORD_NAME"'".*"type":"A".*/\1/p' | head -n1)"
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# 3) A record payload + create/update
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json_payload_a() {
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cat <<JSON
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{"type":"A","name":"${CF_SHORT_NAME}","content":"${current_ip}","ttl":${CF_TTL},"proxied":${CF_PROXIED}}
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JSON
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}
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if [[ -z "$record_id" ]]; then
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log "Creating A ${CF_RECORD_NAME} -> ${current_ip}"
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curl -fsS -X POST "${hdr[@]}" \
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--data "$(json_payload_a)" \
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"${API}/zones/${zone_id}/dns_records" >/dev/null
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log "A record created."
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else
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log "Updating A ${CF_RECORD_NAME} -> ${current_ip}"
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curl -fsS -X PUT "${hdr[@]}" \
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--data "$(json_payload_a)" \
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"${API}/zones/${zone_id}/dns_records/${record_id}" >/dev/null
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log "A record updated."
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fi
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# 4) Create/Update CNAME: SHORT_ALIAS -> CF_RECORD_NAME
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if [[ "$SHORT_ALIAS_FQDN" == "$CF_RECORD_NAME" ]]; then
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log "SHORT_ALIAS equals CF_RECORD_NAME; skipping CNAME to avoid name conflict."
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else
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cname_q="type=CNAME&name=$(urlenc "$SHORT_ALIAS_FQDN")"
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cname_json="$(curl -fsS "${hdr[@]}" "${API}/zones/${zone_id}/dns_records?${cname_q}")"
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cname_id="$(echo "$cname_json" | sed -n 's/.*"id":"\([^"]*\)".*"name":"'"$SHORT_ALIAS_FQDN"'".*"type":"CNAME".*/\1/p' | head -n1)"
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json_payload_cname() {
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cat <<JSON
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{"type":"CNAME","name":"${SHORT_ALIAS}","content":"${CF_RECORD_NAME}","ttl":${CF_TTL},"proxied":${CF_PROXIED}}
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JSON
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}
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if [[ -z "$cname_id" ]]; then
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log "Creating CNAME ${SHORT_ALIAS_FQDN} -> ${CF_RECORD_NAME}"
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curl -fsS -X POST "${hdr[@]}" \
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--data "$(json_payload_cname)" \
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"${API}/zones/${zone_id}/dns_records" >/dev/null
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log "CNAME created."
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else
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log "Updating CNAME ${SHORT_ALIAS_FQDN} -> ${CF_RECORD_NAME}"
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curl -fsS -X PUT "${hdr[@]}" \
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--data "$(json_payload_cname)" \
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"${API}/zones/${zone_id}/dns_records/${cname_id}" >/dev/null
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log "CNAME updated."
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fi
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fi
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echo "$current_ip" > "$LAST_IP_FILE"
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