Golang编写判断IP是否能够Ping通

package main

import (
   "bytes"
   "encoding/binary"
   "fmt"
   "log"
   "net"
   "time"
)

var icmp ICMP

type ICMP struct {
   Type        uint8
   Code        uint8
   Checksum    uint16
   Identifier  uint16
   SequenceNum uint16
}

func main() {
   bool := isping("0.0.0.0")
   fmt.Println("结果为:", bool)
}

func isping(ip string) bool {
   //开始填充数据包
   icmp.Type = 8 //8->echo message  0->reply message
   icmp.Code = 0
   icmp.Checksum = 0
   icmp.Identifier = 0
   icmp.SequenceNum = 0

   recvBuf := make([]byte, 32)
   var buffer bytes.Buffer

   //先在buffer中写入icmp数据报求去校验和
   binary.Write(&buffer, binary.BigEndian, icmp)
   icmp.Checksum = CheckSum(buffer.Bytes())
   //然后清空buffer并把求完校验和的icmp数据报写入其中准备发送
   buffer.Reset()
   binary.Write(&buffer, binary.BigEndian, icmp)

   Time, _ := time.ParseDuration("2s")
   conn, err := net.DialTimeout("ip4:icmp", ip, Time)
   if err != nil {
      return false
   }
   _, err = conn.Write(buffer.Bytes())
   if err != nil {
      log.Println("conn.Write error:", err)
      return false
   }
   conn.SetReadDeadline(time.Now().Add(time.Second * 2))
   num, err := conn.Read(recvBuf)
   if err != nil {
      log.Println("conn.Read error:", err)
      return false
   }

   conn.SetReadDeadline(time.Time{})

   if string(recvBuf[0:num]) != "" {
      return true
   }
   return false

}

func CheckSum(data []byte) uint16 {
   var (
      sum    uint32
      length int = len(data)
      index  int
   )
   for length > 1 {
      sum += uint32(data[index])<<8 + uint32(data[index+1])
      index += 2
      length -= 2
   }
   if length > 0 {
      sum += uint32(data[index])
   }
   sum += (sum >> 16)

   return uint16(^sum)
}

转载于:https://my.oschina.net/wgc2010/blog/2960776