Linux-DDNS(自制脚本)

自用脚本，可能有很多Bug
```bash
#!/bin/sh
# CloudFlare DDNS,可不更改文件直接使用参数使用
# sh CloudFlare.sh -a <邮箱账户> -b <APIkey> -c <一级域名> -d <二级域名> -e <IPv4|IPv6> -f <强制更新>

# ———————————————————————————————————更改为自己的配置———————————————————————————————————————
# -a 邮箱账户
CFUSER='Email'
# -b APIKey(非登录密码,在 https://dash.cloudflare.com/profile/api-tokens 创建)
CFKEY='APIKey'
# -c 一级域名
CFZONE='918178.xyz'
# -d 二级域名
CFZONENAME='vps'
# -e 需解析为:A(IPv4)|AAAA(IPv6)
CFRECORD_TYPE='A'
# -f 强制更新,sh CloudFlare.sh -f
# FORCE='true'

# ———————————————————————————————————传递参数———————————————————————————————————————
while getopts a:b:c:d:e:f: opts; do
    case ${opts} in
    a) CFUSER=${OPTARG} ;;
    b) CFKEY=${OPTARG} ;;
    c) CFZONE=${OPTARG} ;;
    d) CFZONENAME=${OPTARG} ;;
    e) CFRECORD_TYPE=${OPTARG} ;;
    f) FORCE=${OPTARG} ;;
    esac
done

# ——————————————————————————————————检测所需环境———————————————————————————————————————
# 检测系统是否安装了curl,没有则自动安装
if ! type curl >/dev/null 2>&1; then
    echo 'curl 未安装,自动安装...'
    # 一般以管理员账户运行,无需sudo
    apt install -y curl
    echo 'curl 安装完成.'
fi
# 检测系统是否安装了jq,没有则自动安装
if ! type jq >/dev/null 2>&1; then
    echo 'jq 未安装,自动安装...'
    # 一般以管理员账户运行,无需sudo
    apt install -y jq
    echo 'jq 安装完成.'
fi

# ——————————————————————————————————获取公网IP———————————————————————————————————————
# 检查参数否正确,并且配置获取IP网站
echo '检测可以的获取IP地址网站...'
# curl -s 静默,-connect-timeout 2 连接超时2s,-m 2 请求超时2s
if [ "$CFRECORD_TYPE" = "A" ]; then
    # 选个最快的获取IPv4地址网站,--connect-timeout <s>
    if [ `curl -s -connect-timeout 2 -m 2 ipinfo.io/ip` ]; then
        WANIPSITE="ipinfo.io/ip"
    elif [ `curl -s -connect-timeout 2 -m 2 ipecho.net/plain` ]; then
        WANIPSITE="ipecho.net/plain"
    elif [ `curl -s -connect-timeout 2 -m 2 ipv4.ip.sb` ]; then
        WANIPSITE="ipv4.ip.sb"
    elif [ `curl -s -connect-timeout 2 -m 2 ipv4.icanhazip.com` ]; then
        WANIPSITE="ipv4.icanhazip.com"
    else
        # 无法获取,报错停止脚本
        echo "无法连接到获取IPv4服务,请检查网络!!!"
        exit 2
    fi
elif [ "$CFRECORD_TYPE" = "AAAA" ]; then
    # 选个最快的获取IPv6地址网站
    if [ `curl -s curl -s -connect-timeout 2 -m 2 ipv6.ip.sb` ]; then
        WANIPSITE="curl -s ipv6.ip.sb"
    elif [ `curl -s -connect-timeout 2 -m 2 ipv6.icanhazip.com` ]; then
        WANIPSITE="ipv6.icanhazip.com"
    else
        # 无法获取,报错停止脚本
        echo "无法连接到获取IPv6服务,请检查网络!!!"
        exit 2
    fi
else
    # 参数配置错误,报错停止脚本
    echo "CFRECORD_TYPE 参数无效,只能是:A(IPv4)|AAAA(IPv6)"
    echo "当前参数为: $CFRECORD_TYPE"
    exit 2
fi
echo "——————————————————————————————————————————————————————————————"
echo "获取IP服务为: "$WANIPSITE
# 获取当前公网IP
WAN_IP=`curl -s ${WANIPSITE}`

# 判断是否成功获取到公网IP,-z 判断是否为空;-n 判断是否非空
if [ -z "$WAN_IP" ]; then
    # 无法获取,报错停止脚本
    echo "无法获取公网地址,请检查网络!!!"
    exit 2
fi
echo "当前公网地址为: "$WAN_IP

# ——————————————————————————————————自动抓取 CloudFlare 区域ID 和 名称标识符———————————————————————————————————————
# 获取域名信息,以json文件存储
curl -sX GET "https://api.cloudflare.com/client/v4/zones/" \
    -H "X-Auth-Email: $CFUSER" \
    -H "X-Auth-Key: $CFKEY" \
    -H "Content-Type: application/json" > filename.json
# 从json文件中获取区域ID:查找文件,查找id,去除两侧双引号
zone_id=`jq -r '.result[] | select(.name=="'$CFZONE'")' filename.json | jq .id | sed 's/\"//g'`

# 获取区域信息,以json文件存储
curl -sX GET "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/" \
    -H "X-Auth-Email: $CFUSER" \
    -H "X-Auth-Key: $CFKEY" \
    -H "Content-Type: application/json" > filename.json
# 从json文件中获取名称标识符:查找文件,查找id,去除两侧双引号
nameid=`jq -r '.result[] | select(.name=="'$CFZONENAME'.'$CFZONE'")' filename.json | jq .id | sed 's/\"//g'`
# 从json文件中获取当前解析IP:查找文件,查找id,去除两侧双引号
ip=`jq -r '.result[] | select(.name=="'$CFZONENAME'.'$CFZONE'")' filename.json | jq .content | sed 's/\"//g'`
echo "当前CloudFlare地址为: "$ip
echo "——————————————————————————————————————————————————————————————"

# ——————————————————————————————————更新 CloudFlare DNS———————————————————————————————————————
# 判断当前公网IP是否和CloudFlare中的解析一致
if [ "$FORCE" = "true" ]; then
    # 无法获取,报错停止脚本
    echo "---强制更新DNS---"
    curl -sX PUT "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$nameid/" \
        -H "X-Auth-Email: $CFUSER" \
        -H "X-Auth-Key: $CFKEY" \
        -H "Content-Type: application/json" \
        --data '{"type":"'$CFRECORD_TYPE'","name":"'$CFZONENAME'.'$CFZONE'","content":"'$WAN_IP'","ttl":120,"proxied":false}' \
    > filename.json
elif [ "$ip" = "$WAN_IP" ]; then
    echo "---当前公网IP和CloudFlare中的解析一致,跳过---"
else
    echo "---更新DNS---"
    curl -sX PUT "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/$nameid/" \
        -H "X-Auth-Email: $CFUSER" \
        -H "X-Auth-Key: $CFKEY" \
        -H "Content-Type: application/json" \
        --data '{"type":"'$CFRECORD_TYPE'","name":"'$CFZONENAME'.'$CFZONE'","content":"'$WAN_IP'","ttl":120,"proxied":false}' \
    > filename.json
fi

# ——————————————————————————————————检测 DNS 更新状态———————————————————————————————————————
# 获取区域信息,以json文件存储
curl -sX GET "https://api.cloudflare.com/client/v4/zones/$zone_id/dns_records/" \
    -H "X-Auth-Email: $CFUSER" \
    -H "X-Auth-Key: $CFKEY" \
    -H "Content-Type: application/json" > filename.json
# 从json文件中获取当前解析IP:查找文件,查找id,去除两侧双引号
ip=`jq -r '.result[] | select(.name=="'$CFZONENAME'.'$CFZONE'")' filename.json | jq .content | sed 's/\"//g'`
if [ "$ip" = "$WAN_IP" ]; then
    echo "---更新成功^_^---"
else
    echo "---更新失败...---"
fi

# ——————————————————————————————————清理缓存文件———————————————————————————————————————
#删除用于临时存储json的文件
rm filename.json
```