golang ping implementation

Go language (Golang) is a very popular programming language known for its efficiency, scalability and ease of deployment. Implementing the Ping tool in the Go program can help us detect the network connection status, thereby optimizing network performance and reducing network failures. In this article, we will learn how to implement the Ping tool using Go language.

Ping is a well-known network diagnostic tool that tests network connections by sending ICMP messages to the target server and receiving responses. There are two common ways to implement the Ping tool:

1. Use the ping utility provided by the system, such as using the ping command in Linux.
2. Create and send ICMP packets directly in the program, and then receive network responses.

In this article, we will discuss the second method, which is to implement the Ping tool using Go language.

Implementation process

In Go language, we can use the Ping() function in the net package to implement the Ping tool. This function requires an IP address or hostname as a parameter and returns a bool value.

First, we need to import the net package:

import "net"

Next, we can write the following code to implement the Ping function:

func ping(host string) bool {
  conn, err := net.Dial("ip4:icmp", host)
  if err != nil {
    fmt.Println(err)
    return false
  }
  defer conn.Close()

  msg := make([]byte, 28)
  msg[0] = 8 // echo
  msg[1] = 0 // code
  msg[2] = 0 // checksum
  msg[3] = 0 // checksum
  msg[4] = 0 // identifier[0]
  msg[5] = 13 // identifier[1]
  msg[6] = 0 // sequence[0]
  msg[7] = 37 // sequence[1]
  len := len(msg)
  checksum := checkSum(msg, len)
  msg[2] = byte(checksum >> 8)
  msg[3] = byte(checksum & 255)
  t1 := time.Now()
  conn.SetDeadline(t1.Add(time.Second))
  _, err = conn.Write(msg)
  if err != nil {
    fmt.Println(err)
    return false
  }
  recv := make([]byte, 1024)
  _, err = conn.Read(recv)
  if err != nil {
    fmt.Println(err)
    return false
  }
  t2 := time.Now()
  fmt.Println("RTT:", t2.Sub(t1))
  return true
}

func checkSum(msg []byte, len int) uint16 {
  sum := 0
  for n := 1; n < len-1; n += 2 {
    sum += int(msg[n])*256 + int(msg[n+1])
  }
  sum = (sum >> 16) + (sum & 0xffff)
  sum += (sum >> 16)
  return uint16(^sum)
}

In this code, we first use The net.Dial() function connects to the target host. After the connection is successful, we build an ICMP packet and send it to the target host. We then wait for the network response and calculate the round trip time. Finally, we return a Boolean value indicating whether the ping request was successful.

Notes

It should be noted that the Ping function requires higher security permissions. In a Windows environment, you need to run the program as an administrator to use the Ping function. In Linux and Unix environments, root privileges are required.

In addition, the Ping function needs to be compatible with the system network settings. If the computer or network you are using is subject to security restrictions, you may not be able to connect to the target host. If you cannot connect to the target host, please contact your network administrator.

Summary

In this article, we learned how to implement the Ping tool using Go language. Ping is a very useful network diagnostic tool, which can help us test the network connection status and optimize network performance. It is very easy to implement the Ping function using Go language. You only need to use the Ping() function in the net package. We also discuss some considerations, such as permissions and network setup issues. I hope this article can help you better understand the implementation of the Ping tool and the application of the Go language.

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