程序一分钟执行一次，检测路由器外网IP地址变更则自动发送邮件，使用网易126 smtp协议发送邮件，邮箱地址及授权码请自行替换，getIp函数中的grep根据自己的网卡信息调试替换
R6900路由器的交叉编译语句：CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=5 go build xxxx.go
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package main
import (
"fmt"
"gopkg.in/gomail.v2"
"io/ioutil"
"log"
"os/exec"
"strconv"
"time"
)
// 邮件主题
var subject = "路由器外网IP更新"
//定义收件人
var mailTo = []string{
"****@qq.com",
"****@163.com",
}
// ip地址
var ip string
func main() {
ip := getIp()
send(ip)
ticker := time.NewTicker(time.Minute * 1)
for range ticker.C {
newIp := getIp()
if newIp != ip {
ip = newIp
send(ip)
}
}
}
// 获取当前ip
func getIp() string {
return execCmd("/usr/sbin/ip a | grep 'scope global ppp0' | awk '{print $2}'")
}
// 发送邮件
func send(ip string) {
body := "新的外网IP为：" + ip
log.Print(body)
err := execSend(mailTo, subject, body)
if err != nil {
log.Print("mail send fail")
log.Print(err)
return
}
log.Print("mail send successfully")
}
// 执行发送
func execSend(mailTo []string, subject string, body string) error {
mailConn := map[string]string{
"user": "****@126.com",
"pass": "********",
"host": "smtp.126.com",
"port": "25",
}
port, _ := strconv.Atoi(mailConn["port"])
m := gomail.NewMessage()
m.SetHeader("From", m.FormatAddress(mailConn["user"], "路由器R6900"))
m.SetHeader("To", mailTo...) //发送给多个用户
m.SetHeader("Subject", subject) //设置邮件主题
m.SetBody("text/html", body) //设置邮件正文
d := gomail.NewDialer(mailConn["host"], port, mailConn["user"], mailConn["pass"])
err := d.DialAndSend(m)
return err
}
// 执行shell命令
func execCmd(command string) string {
cmd := exec.Command("/bin/sh", "-c", command)
stdout, _ := cmd.StdoutPipe()
if err := cmd.Start(); err != nil {
fmt.Println("Execute failed when Start:" + err.Error())
return ""
}
out_bytes, _ := ioutil.ReadAll(stdout)
stdout.Close()
if err := cmd.Wait(); err != nil {
fmt.Println("Execute failed when Wait:" + err.Error())
return ""
}
return string(out_bytes)
}
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