前言

自从捡回了蜗牛用于家用NAS后，使用公网IP访问家里的服务更加频繁。虽然家里的软路由已经配置了DDNS来更新IP域名绑定信息，但偶尔还是出现了几次插件运行出错。于是自己写了一个获取WAN口IP并利用 Server酱 推送至微信的脚本，通过Crontab定时任务执行来检查IP是否变化。

2021/12/01 增加了推送到企业微信的版本分享出来。

代码部分

#/bin/ash
#用于openwrt
#updata 2020/12/19 23:07
#start
echo "==========开始=========="
echo `date '+%Y-%m-%d %H:%M:%S'`
#获取当前wan_ip
current_wan_ip=`ifconfig -a | grep inet | grep -v inet6 | grep -v 127.0.0.1 | grep -v 192.168.0.1 | awk '{print $2}' | tr -d "addr:"`
echo "IP: $current_wan_ip"
#是否存在ip.txt
if [ ! -f "/tmp/ip.txt" ]; then
	echo "不存在ip.txt文件"
	#第一次推送ip
	content="?text=路由器IP已更新&""desp=当前IP:"$current_wan_ip
	url="https://sc.ftqq.com/Server酱KEY已隐去.send"$content
	curl $url
	echo "已推送当前ip"
	echo ${current_wan_ip} > /tmp/ip.txt
	echo "当前IP已写入ip.txt"
else
	last_ip=`cat /tmp/ip.txt`
	if [ "${current_wan_ip}" != "${last_ip}" ]; then
		#发送新ip并更新ip.txt
		content="?text=路由器IP已更新&""desp=当前IP:"$current_wan_ip
		url="https://sc.ftqq.com/Server酱KEY已隐去.send"$content
		curl $url
		echo ${current_wan_ip} > /tmp/ip.txt
		echo "已推送新ip并更新ip.txt"
	else
		echo "IP无变化,不需要推送"
	fi
fi
echo `date '+%Y-%m-%d %H:%M:%S'`
echo -e "==========结束==========\n"
#end

企业微信webhook版本

#/bin/ash
#用于openwrt
#updata 2021/03/31 更新为企业微信机器人推送通道
#start
echo "==========开始=========="
echo `date '+%Y-%m-%d %H:%M:%S'`
#企业微信机器人webhook
webhook="https://qyapi.weixin.qq.com/cgi-bin/webhook/send?key=自己的key"
#获取当前wan_ip
current_wan_ip=`ifconfig -a | grep inet | grep -v inet6 | grep -v 127.0.0.1 | grep -v 192.168.0.1 | grep -v 172.17.0.1 | awk '{print $2}' | tr -d "addr:"`
echo "IP: $current_wan_ip"
#是否存在ip.txt
if [ ! -f "/tmp/ip.txt" ]; then
	echo "不存在ip.txt文件"
	#第一次推送ip
	content="路由器IP已更新\n当前IP: ""$current_wan_ip"
	curl "$webhook" -H "Content-Type: application/json" -d "{\"msgtype\":\"text\",\"text\":{\"content\":\"$content\"}}"
	echo "已推送当前ip"
	echo ${current_wan_ip} > /tmp/ip.txt
	echo "当前IP已写入ip.txt"
else
	last_ip=`cat /tmp/ip.txt`
	if [ "${current_wan_ip}" != "${last_ip}" ]; then
		#发送新ip并更新ip.txt
	content="路由器IP已更新\n当前IP: ""$current_wan_ip"
	curl "$webhook" -H "Content-Type: application/json" -d "{\"msgtype\":\"text\",\"text\":{\"content\":\"$content\"}}"
	echo "已推送当前ip"
	echo ${current_wan_ip} > /tmp/ip.txt
	echo "IP已更新至ip.txt"
	else
		echo "IP无变化,不需要推送"
	fi
fi
echo `date '+%Y-%m-%d %H:%M:%S'`
echo -e "==========结束==========\n"
#end

部署

1. 上传该脚本并赋予执行权限chmod a+x check_ip.sh
2. 编辑crontab任务计划crontab -e进入任务计划列表添加以下任务，每5分钟执行一次脚本，并将执行结果写入到push.log文件中：

   */5 * * * * /usr/bin/myscripts/check_ip/check_ip.sh >> /usr/bin/myscripts/check_ip/push.log 2>&1 &
   

3. 通过push.log查看运行情况

   root@OpenWrt:~# tail -f /usr/bin/myscripts/check_ip/push.log
   2020-12-219 23:14:00
   ==========开始==========
   2020-12-19 23:15:00
   IP: xx.xx.72.193
   IP无变化,不需要推送
   2020-12-19 23:15:00
   ==========结束==========
   
   ==========开始==========
   2020-12-19 23:20:00
   IP: xx.xx.72.193
   IP无变化,不需要推送
   2021-02-19 23:20:00
   ==========结束==========
   
   转载自：https://www.cnblogs.com/mustard27/p/Openwrt_CheckIP.html