Golang : syscall.Socket example
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
By Adam Ng
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