功能：

服务端提供一个http服务，客户端通过定时向服务端发送信息来确认并记录客户端的IP地址来达到动态DNS的目的。 此工具通过调用dnspod API来达到实现DDNS功能，并利用telegram bot来达到提供IP变动时的提醒功能。

此工具如何鉴定客户端发送信息的从正确的客户端发出的？

1. 服务端和客户端提前设定好的一段字符A.
2. 时间戳数值整除一个数值B得到结果C.这样在B秒内,服务端和客户端得到的结果C是一致的.
3. 生成token,token=sha256(A+C).token每隔B秒会发生变动.
4. 通过鉴定token来确定信息是否来自可信客户端.
5. 使用https通讯防止中间人对信息的截获及篡改.

Install:go install homeip

homeip为服务端可执行程序

client/myip.sh为客户端脚本

Usage:homeip -h

Usage of homeip:
  -c string
        json config file (default "config.json")
  -v    version

config.json:

{
  "addr": "127.0.0.1:9090",  // http server addres
  "step": 20,  // how much time change the token
  "random": "change it",  // your key
  // For dnspod API https://www.dnspod.cn/docs/records.html#dns
  "dnspodtoken": "change it",
  "format": "json",
  "domain_id": "change it",
  "record_id": "change it",
  "sub_domain": "change it",
  "record_line": "默认",
  // For telegram bot
  "telegram_token": "change it",
  "notification_id":"change it"
}

NOTE:

you can GET /myip to view your IP with no Control access on this server.if you don't want any body know you home ip,your can run this server under nginx to Restricting Access with HTTP Basic Authentication

homeip will create a myip.txt file under the running directory to store ip address