内网获取公网IP通过钉钉通知

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#!/usr/bin/sh
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DATE="`date +%Y%m%d`"
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DATE1="`date +%Y-%m-%d`"
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DATE2="`date +%H:%M:%S`"
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webhook='https://oapi.dingtalk.com/robot/send?access_token=tian'自己钉钉机器人的key'
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OLD_IP=$(grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' checkip.txt)
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NEW_IP=$(curl -s myip.ipip.net | sed s/IP：//g | awk '{print $2}')
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province=$(curl -s myip.ipip.net | awk '{print $4}')
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city=$(curl -s myip.ipip.net | awk '{print $5}')
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ISP=$(curl -s myip.ipip.net | awk '{print $6}')
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function CheckIp
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{
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  real_ip=$(echo $ip|awk -F. '$1<=255&&$2<=255&&$3<=255&&$4<=255{print "yes"}')
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  if echo $OLD_IP|grep -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$">/dev/null
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  then
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    if [ ${real_ip:no}=="yes" ]
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    then
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      echo "ip合法"
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    else
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      echo "ip不合法"
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      return 1
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    fi
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  else
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    echo "ip格式错误"
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    return 2
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  fi
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}
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function Validation {
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if [ $NEW_IP = $OLD_IP ];
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then
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    echo "IP一致，不必更新"
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else
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    echo "IP不一致，执行更新"
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    echo $NEW_IP > checkip.txt   #这个txt需要和脚本处在同级目录下
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    Update
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fi
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}
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function Update {
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        curl $webhook -H 'Content-Type: application/json' -d '
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        {
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                "msgtype": "markdown",
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                "markdown": {
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                  "title":"IP已更新，请注意查收！",    #钉钉机器人添加IP关键字
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      "text": "# IP：'${NEW_IP}'\n\n---\n> 时间：'${DATE1}' '${DATE2}'\n\n> 归属地：'${province}''${city}'\n\n> 运营商：'${ISP}'"
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                },
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                "at": {
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                "atMobiles": [
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                        "自己的手机号码"
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        ],
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        "isAtAll": false
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        }
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        }'
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}
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CheckIp $OLD_IP
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Validation