Add Cloudflare DDNS updater scripts and systemd configurations

dyndns/cf-ddns.sh

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+#!/usr/bin/env bash
+# cf-ddns.sh - Cloudflare DDNS updater
+set -euo pipefail
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+if [ -f "${DIR}/.env" ]; then
+  # shellcheck disable=SC1091
+  source "${DIR}/.env"
+else
+  echo "$(date -Iseconds) ERROR: missing ${DIR}/.env (create from .env.example)" >&2
+  exit 1
+fi
+
+: "${CF_API_TOKEN:?need CF_API_TOKEN in .env}"
+: "${ZONE:?need ZONE in .env}"
+: "${RECORDS:?need RECORDS in .env}"
+: "${IP_URL:=https://ipv4.icanhazip.com}"
+: "${PROXIED:=false}"
+
+AUTH_HEADER="Authorization: Bearer ${CF_API_TOKEN}"
+CT_HEADER="Content-Type: application/json"
+
+log() { echo "$(date -Iseconds) $*"; }
+
+IP=$(curl -fsS "${IP_URL}" | tr -d '[:space:]')
+if [[ -z "${IP}" ]]; then
+  log "ERROR: could not determine public IP"
+  exit 1
+fi
+
+ZONE_ID=$(curl -fsS -X GET "https://api.cloudflare.com/client/v4/zones?name=${ZONE}" \
+  -H "${AUTH_HEADER}" -H "${CT_HEADER}" | jq -r '.result[0].id // empty')
+
+if [[ -z "${ZONE_ID}" ]]; then
+  log "ERROR: zone not found: ${ZONE}"
+  exit 1
+fi
+
+IFS=',' read -r -a RECORD_ARR <<< "${RECORDS}"
+for fullrec in "${RECORD_ARR[@]}"; do
+  rec=$(echo "${fullrec}" | xargs)
+  log "Processing ${rec}"
+  info=$(curl -fsS -X GET "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records?name=${rec}&type=A" \
+    -H "${AUTH_HEADER}" -H "${CT_HEADER}")
+
+  RECORD_ID=$(echo "$info" | jq -r '.result[0].id // empty')
+  CURRENT_CONTENT=$(echo "$info" | jq -r '.result[0].content // empty')
+
+  if [[ -z "${RECORD_ID}" ]]; then
+    log "Creating ${rec} -> ${IP}"
+    create_resp=$(curl -fsS -X POST "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records" \
+      -H "${AUTH_HEADER}" -H "${CT_HEADER}" \
+      --data "{\"type\":\"A\",\"name\":\"${rec}\",\"content\":\"${IP}\",\"ttl\":1,\"proxied\":${PROXIED}}")
+    ok=$(echo "$create_resp" | jq -r '.success // false')
+    if [[ "$ok" != "true" ]]; then
+      log "ERROR creating ${rec}: ${create_resp}"
+    else
+      log "Created ${rec}"
+    fi
+  else
+    if [[ "${CURRENT_CONTENT}" == "${IP}" ]]; then
+      log "${rec} unchanged (${IP})"
+    else
+      log "Updating ${rec} -> ${IP}"
+      upd_resp=$(curl -fsS -X PUT "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${RECORD_ID}" \
+        -H "${AUTH_HEADER}" -H "${CT_HEADER}" \
+        --data "{\"type\":\"A\",\"name\":\"${rec}\",\"content\":\"${IP}\",\"ttl\":1,\"proxied\":${PROXIED}}")
+      ok=$(echo "$upd_resp" | jq -r '.success // false')
+      if [[ "$ok" != "true" ]]; then
+        log "ERROR updating ${rec}: ${upd_resp}"
+      else
+        log "Updated ${rec}"
+      fi
+    fi
+  fi
+done

dyndns/deploy.sh

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+#!/usr/bin/env bash
+# deploy.sh - copy systemd units and on_boot entry into place, reload systemd, enable timers
+set -euo pipefail
+
+REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SYSTEMD_DIR="/etc/systemd/system"
+
+echo "Deploying from ${REPO_DIR}"
+
+if [[ -d "${REPO_DIR}/systemd" ]]; then
+  cp -f "${REPO_DIR}/systemd/"* "${SYSTEMD_DIR}/"
+fi
+
+chmod +x "${REPO_DIR}/cf-ddns.sh"
+systemctl daemon-reload || true
+systemctl enable --now cf-ddns.timer || true
+systemctl enable --now git-sync.timer || true
+
+echo "Deployment complete."

dyndns/git-sync.sh

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+#!/usr/bin/env bash
+# git-sync.sh - pull changes and run deploy.sh if updated
+set -euo pipefail
+
+REPO_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "${REPO_DIR}"
+
+git fetch --all --prune
+
+UPDATED=0
+if git rev-parse --abbrev-ref --symbolic-full-name @{u} >/dev/null 2>&1; then
+  LOCAL="$(git rev-parse @)"
+  REMOTE="$(git rev-parse @{u})"
+  if [ "${LOCAL}" != "${REMOTE}" ]; then
+    UPDATED=1
+  fi
+else
+  out="$(git pull --rebase 2>&1 || true)"
+  if ! echo "${out}" | grep -q "Already up"; then
+    UPDATED=1
+  fi
+fi
+
+if [ "${UPDATED}" -eq 1 ]; then
+  echo "$(date -Iseconds) Repo updated -> running deploy.sh"
+  "${REPO_DIR}/deploy.sh"
+else
+  echo "$(date -Iseconds) Repo unchanged"
+fi

dyndns/systemd/cf-ddns.service

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+[Unit]
+Description=Cloudflare DDNS updater
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+ExecStart=/opt/cloudflare-ddns/cf-ddns.sh
+WorkingDirectory=/opt/cloudflare-ddns

dyndns/systemd/cf-ddns.timer

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+[Unit]
+Description=Run Cloudflare DDNS every 5 minutes
+
+[Timer]
+OnBootSec=1min
+OnUnitActiveSec=5min
+Persistent=true
+
+[Install]
+WantedBy=timers.target

dyndns/systemd/git-sync.service

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+[Unit]
+Description=Git sync for cloudflare-ddns repo
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=oneshot
+WorkingDirectory=/opt/cloudflare-ddns
+ExecStart=/opt/cloudflare-ddns/git-sync.sh

dyndns/systemd/git-sync.timer

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+[Unit]
+Description=Run git-sync every 1 minute
+
+[Timer]
+OnBootSec=30s
+OnUnitActiveSec=60s
+Persistent=true
+
+[Install]
+WantedBy=timers.target