Cloudflare DDNS 更新脚本（脱敏版）：多域名 A/AAAA 同步，过滤 ULA 内网 IPv6

cloudflare-ddns.sh

@@ -0,0 +1,127 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# ========== 配置区 ==========
+# 认证方式二选一(方式一优先):
+#   方式一(推荐): My Profile -> API Tokens 创建的受限 Token, 权限 Zone->DNS->Edit
+API_TOKEN=""
+#   方式二: Global API Key (My Profile -> API Tokens -> API Keys 页面), 配合账号邮箱
+API_EMAIL=""
+API_KEY=""
+# 每条记录一行, 格式: 域名:类型(:proxied)
+#   域名   根域 / 子域 / 泛解析均可, 所属 Zone 自动识别(同一账号下一个 Token 即可)
+#   类型   A=IPv4, AAAA=IPv6
+#   proxied 可选: true=开Cloudflare CDN代理, false=纯解析(默认)
+#   以后新增域名只需在下面加一行
+RECORDS=(
+  "lmve.net:A"
+  "lmve.net:AAAA"
+  "*.lmve.net:A"
+  "*.lmve.net:AAAA"
+  "wnfed.com:A"
+  "wnfed.com:AAAA"
+  "*.wnfed.com:A"
+  "*.wnfed.com:AAAA"
+)
+# ===========================
+
+API="https://api.cloudflare.com/client/v4"
+LOG() { echo "[$(date '+%F %T')] $*"; }
+
+# 认证头: 优先用受限 Token, 否则用 Global API Key + 邮箱
+AUTH=()
+if [ -n "$API_TOKEN" ]; then
+  AUTH=(-H "Authorization: Bearer $API_TOKEN")
+elif [ -n "$API_EMAIL" ] && [ -n "$API_KEY" ]; then
+  AUTH=(-H "X-Auth-Email: $API_EMAIL" -H "X-Auth-Key: $API_KEY")
+else
+  LOG "!!! 未配置认证信息 (API_TOKEN 或 API_EMAIL+API_KEY)"
+  exit 1
+fi
+
+# IP 只抓取一次, 多条记录复用
+CACHE4="" CACHE6=""
+declare -A ZONE_CACHE
+
+get_ipv4() {
+  if [ -z "$CACHE4" ]; then
+    CACHE4=$(curl -fsS --max-time 10 -4 https://api.ipify.org 2>/dev/null) || true
+  fi
+  echo "$CACHE4"
+}
+
+get_ipv6() {
+  if [ -z "$CACHE6" ]; then
+    # 优先取本机网卡上的公网 IPv6 (2000::/3), 排除 ULA 内网地址 (fc00::/7); 取不到再走外部检测
+    CACHE6=$(ip -6 addr show scope global 2>/dev/null | awk '/inet6/{print $2}' | grep -E '^[23][0-9a-fA-F]{3}:' | head -1 | cut -d/ -f1) || true
+    if [ -z "$CACHE6" ]; then
+      CACHE6=$(curl -fsS --max-time 10 -6 https://api64.ipify.org 2>/dev/null) || true
+    fi
+  fi
+  echo "$CACHE6"
+}
+
+# 从记录名推断所属 Zone (逐级剥离左边标签, 匹配最长后缀), 结果缓存
+get_zone_id() {
+  local rec="$1" cand="$1" resp zid
+  while [ "$(echo "$cand" | tr -cd '.' | wc -c)" -ge 1 ]; do
+    if [ -n "${ZONE_CACHE[$cand]:-}" ]; then
+      echo "${ZONE_CACHE[$cand]}"
+      return 0
+    fi
+    # 含通配符的候选名不可能是 Zone, 直接跳过
+    if [[ "$cand" != *"*"* ]]; then
+      resp=$(curl -fsS -g --max-time 15 "${AUTH[@]}" \
+        "$API/zones?name=$cand&status=active" 2>/dev/null) || true
+      zid=$(echo "$resp" | grep -o '"id":"[0-9a-f]\{32\}"' | head -1 | sed 's/.*:"//;s/"$//')
+      if [ -n "$zid" ]; then
+        ZONE_CACHE[$cand]="$zid"
+        echo "$zid"
+        return 0
+      fi
+    fi
+    cand="${cand#*.}"
+  done
+  LOG "!!! 找不到 $rec 所属的 Zone"
+  return 1
+}
+
+update_record() {
+  local name="$1" type="$2" proxied="${3:-false}" zone_id ip=""
+  type=$(echo "$type" | tr '[:lower:]' '[:upper:]')
+  zone_id=$(get_zone_id "$name") || return 1
+  if [ "$type" = "A" ]; then ip=$(get_ipv4); else ip=$(get_ipv6); fi
+  [ -z "$ip" ] && { LOG "跳过 $name：获取不到 $type 地址"; return 1; }
+
+  local resp rec_id="" cur_ip=""
+  resp=$(curl -fsS -g --max-time 15 "${AUTH[@]}" \
+    "$API/zones/$zone_id/dns_records?type=$type&name=$name" 2>/dev/null) || true
+  rec_id=$(echo "$resp" | grep -o '"id":"[0-9a-f]\{32\}"' | head -1 | sed 's/.*:"//;s/"$//')
+  cur_ip=$(echo "$resp" | grep -o '"content":"[^"]*"' | head -1 | sed 's/.*:"//;s/"$//')
+
+  if [ -n "$rec_id" ] && [ "$cur_ip" = "$ip" ]; then
+    LOG "$type $name 未变化 ($ip)，跳过"
+    return 0
+  fi
+
+  local method="POST" url="$API/zones/$zone_id/dns_records"
+  [ -n "$rec_id" ] && { method="PUT"; url="$url/$rec_id"; }
+
+  local body="{\"type\":\"$type\",\"name\":\"$name\",\"content\":\"$ip\",\"ttl\":120,\"proxied\":$proxied}"
+  if curl -fsS -g --max-time 15 -X "$method" "${AUTH[@]}" \
+       -H "Content-Type: application/json" -d "$body" "$url" 2>/dev/null \
+       | grep -q '"success":true'; then
+    LOG "$type $name -> $ip 更新成功"
+  else
+    LOG "!!! $type $name 更新失败"
+    return 1
+  fi
+}
+
+main() {
+  for entry in "${RECORDS[@]}"; do
+    IFS=':' read -r name type proxied <<< "$entry"
+    update_record "$name" "${type:-A}" "${proxied:-false}" || true
+  done
+}
+main