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| #!/bin/bash
#
# ===================================================================================
# Aliyun DDNS Master Script (Generic Version)
#
# 功能:
# - 自动更新阿里云DNS记录，使其指向目标节点当前的公网IP地址。
# - 支持同时更新多个子域名。
# - 支持IPv4(A)和IPv6(AAAA)记录。
# - 能够自动清理重复的DNS记录。
# - 启动时自动检查依赖项，提供彩色日志和最终执行摘要。
#
# 用法 (Cron):
# */5 * * * * /path/to/this_script.sh > /dev/null 2>&1
#
# ===================================================================================
# ========================= 1. 配置区域 =========================
# --- 域名配置 ---
DOMAIN="example.com"
SUBDOMAINS=(
"data"
"gitlab"
"registry"
)
# --- IP 配置 ---
IP_TYPE="AAAA" # IP类型: A (IPv4) 或 AAAA (IPv6)
# 当IP_TYPE为AAAA时，用于获取IPv6地址的网卡名称
IPV6_INTERFACE="enp1s0"
# ========================= 2. 初始化和函数定义 =========================
# 为cron等最小化环境设置一个可靠的PATH
export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
# --- 颜色定义 ---
C_RESET='\033[0m'; C_GREEN='\033[32m'; C_YELLOW='\033[33m'; C_RED='\033[31m'; C_BLUE='\033[34m'
# --- 日志函数 ---
log_info() { echo -e "${C_GREEN}[$(date "+%Y-%m-%d %H:%M:%S")] [INFO] $1${C_RESET}"; }
log_warn() { echo -e "${C_YELLOW}[$(date "+%Y-%m-%d %H:%M:%S")] [WARN] $1${C_RESET}"; }
log_error() { echo -e "${C_RED}[$(date "+%Y-%m-%d %H:%M:%S")] [ERROR] $1${C_RESET}"; }
log_header(){ echo -e "${C_BLUE}==================== $1 ====================${C_RESET}"; }
abort() { log_error "$1"; exit 1; }
# --- 依赖项检查 ---
check_dependencies() {
log_info "正在检查依赖项..."
local dependencies=("aliyun" "jq" "ip" "curl")
for cmd in "${dependencies[@]}"; do
if ! command -v "$cmd" &> /dev/null; then
abort "依赖命令 '$cmd' 未找到，请先安装。"
fi
done
ALIYUN_CMD=$(command -v aliyun)
}
# --- IP 获取函数 ---
get_current_ip() {
if [ "$IP_TYPE" == "A" ]; then
# 获取 IPv4 地址
curl -s http://v4.ipv6-test.com/api/myip.php
else
# 获取 IPv6 地址
ip -6 addr show dev "${IPV6_INTERFACE}" scope global | grep 'inet6' | awk '{print $2}' | cut -d'/' -f1 | head -n 1
fi
}
# --- 核心更新函数 ---
update_record() {
local subdomain=$1
local ip_to_set=$2
local ddns_domain="${subdomain}.${DOMAIN}"
local ttl=600
log_info "正在处理子域名: ${ddns_domain}"
local records_json
records_json=$(sudo ${ALIYUN_CMD} alidns DescribeDomainRecords --DomainName "${DOMAIN}" --RRKeyWord "${subdomain}" --Type "${IP_TYPE}")
if ! echo "${records_json}" | jq . > /dev/null 2>&1; then
log_error "从阿里云获取 '${ddns_domain}' 记录失败，请检查网络或配置。"
return 2 # 返回失败状态
fi
local record_count
record_count=$(echo "${records_json}" | jq -r '.DomainRecords.Record | length')
# 如果发现重复记录，则全部删除
if [[ ${record_count} -gt 1 ]]; then
log_warn "发现 '${ddns_domain}' 存在 ${record_count} 条重复的 ${IP_TYPE} 记录，将全部删除后重新添加。"
local record_ids
record_ids=$(echo "${records_json}" | jq -r '.DomainRecords.Record[].RecordId')
local cleanup_failed=false
for record_id in $record_ids; do
sudo ${ALIYUN_CMD} alidns DeleteDomainRecord --RecordId "${record_id}"
if [[ $? -ne 0 ]]; then cleanup_failed=true; fi
done
if [[ "$cleanup_failed" == "true" ]]; then
log_error "清理 '${ddns_domain}' 的重复记录时发生错误，中止该任务。"
return 2
else
log_info "所有重复记录已成功清理。"
record_count=0 # 重置计数，强制执行添加逻辑
fi
fi
# 根据记录数决定是“添加”还是“更新”
if [[ ${record_count} -eq 0 ]]; then
log_info "记录不存在或已清理，准备添加..."
sudo ${ALIYUN_CMD} alidns AddDomainRecord --DomainName "${DOMAIN}" --RR "${subdomain}" --Type "${IP_TYPE}" --Value "${ip_to_set}" --TTL "${ttl}"
if [ $? -eq 0 ]; then log_info "添加 '${ddns_domain}' 成功 -> ${ip_to_set}"; return 1; else log_error "添加 '${ddns_domain}' 失败！"; return 2; fi
else
local current_ip record_id
current_ip=$(echo "${records_json}" | jq -r '.DomainRecords.Record[0].Value')
record_id=$(echo "${records_json}" | jq -r '.DomainRecords.Record[0].RecordId')
if [ "$current_ip" == "$ip_to_set" ]; then
log_info "IP地址一致 (${current_ip})，无需更新。"
return 0 # 返回跳过状态
else
log_info "IP不一致。当前: ${current_ip} -> 目标: ${ip_to_set}。准备更新..."
sudo ${ALIYUN_CMD} alidns UpdateDomainRecord --RecordId "${record_id}" --RR "${subdomain}" --Type "${IP_TYPE}" --Value "${ip_to_set}" --TTL "${ttl}"
if [ $? -eq 0 ]; then log_info "更新 '${ddns_domain}' 成功"; return 1; else log_error "更新 '${ddns_domain}' 失败！"; return 2; fi
fi
fi
}
# ========================= 3. 主程序 =========================
log_header "DDNS 任务启动"
check_dependencies
# --- 步骤1: 获取目标IP ---
log_info "正在获取目标IP地址 (${IP_TYPE})..."
current_ip=$(get_current_ip)
if [ -z "$current_ip" ]; then
abort "获取目标IP地址失败，脚本终止。"
fi
log_info "获取到目标IP: ${current_ip}"
# --- 步骤2: 遍历子域名并执行更新 ---
updated_count=0
skipped_count=0
failed_count=0
for sub in "${SUBDOMAINS[@]}"; do
update_record "${sub}" "${current_ip}"
case $? in
0) skipped_count=$((skipped_count + 1));;
1) updated_count=$((updated_count + 1));;
2) failed_count=$((failed_count + 1));;
esac
done
# --- 步骤3: 打印最终摘要 ---
log_header "任务摘要"
log_info "更新/添加: ${updated_count}"
log_info "无需更新: ${skipped_count}"
if [ ${failed_count} -gt 0 ]; then
log_error "失败: ${failed_count}"
else
log_info "失败: ${failed_count}"
fi
log_header "DDNS 任务结束"
exit ${failed_count}
|
