Golang : syscall.Socket example



Tags : golang socket

Just a comparison on how Golang code that utilize net package looks like if implemented with syscall.Socket example :

 package main

 import (
 "fmt"
 "net"
 "os"
 )

 func main() {
 service := "127.0.0.1"
 protocol := "icmp"

 IPAddr, err := net.ResolveIPAddr("ip4", service)

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 IPconn, err := net.ListenIP("ip4:"+protocol, IPAddr)

 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 buffer := make([]byte, 1024)

 for { // display the bytes read from IP connection

 num, clientAddr, _ := IPconn.ReadFrom(buffer)

 fmt.Println("Reading from : ", clientAddr)
 fmt.Printf("% X\n", buffer[:num])
 }

 }

to

 package main

 import (
 "fmt"
 "os"
 "syscall"
 )

 func main() {

 fd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_ICMP)

 if err != nil {
 fmt.Println(err)
 }

 file := os.NewFile(uintptr(fd), "")

 for {
 buffer := make([]byte, 1024)
 num, _ := file.Read(buffer)

 fmt.Printf("% X\n", buffer[:num])
 }
 }

References :

http://www.darkcoding.net/software/raw-sockets-in-go-link-layer/

https://www.socketloop.com/references/golang-net-fileconn-function-example

https://golang.org/pkg/syscall/#Socket



Tags : golang socket

By Adam Ng

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