golang实现icmp中的ping功能

golang实现icmp中的ping功能,第1张

概述package mainimport ( "fmt" "net" "os")func checkSum(msg []byte) uint16 { sum := 0 len := len(msg) for i := 0; i < len-1; i += 2 { sum += int(msg[i])*256 + int(msg[i+1]) } if len%2 == 1
package mainimport (	"fmt"	"net"	"os")func checkSum(msg []byte) uint16 {	sum := 0	len := len(msg)	for i := 0; i < len-1; i += 2 {		sum += int(msg[i])*256 + int(msg[i+1])	}	if len%2 == 1 {		sum += int(msg[len-1]) * 256 // notice here,why *256?	}	sum = (sum >> 16) + (sum & 0xffff)	sum += (sum >> 16)	var answer uint16 = uint16(^sum)	return answer}func checkerror(err error) {	if err != nil {		fmt.Fprint(os.Stderr,"Fatal error:",err.Error())		os.Exit(1)	}}func main() {	if len(os.Args) != 2 {		fmt.Println("Usage: ",os.Args[0],"host")		os.Exit(1)	}	service := os.Args[1]	conn,err := net.Dial("ip4:icmp",service)	checkerror(err)	var msg [512]byte	msg[0] = 8	msg[1] = 0	msg[2] = 0	msg[3] = 0	msg[4] = 0	msg[5] = 13	msg[6] = 0	msg[7] = 37	msg[8] = 99	len := 9	check := checkSum(msg[0:len])	msg[2] = byte(check >> 8)	msg[3] = byte(check & 0xff)	fmt.Println(msg[0:len])	_,err = conn.Write(msg[0:len])	checkerror(err)	_,err = conn.Read(msg[0:])	checkerror(err)	fmt.Println(msg[0 : 20+len])	fmt.Println("Got response")	if msg[20+5] == 13 {		fmt.Println("IDentifIEr matches")	}	if msg[20+7] == 37 {		fmt.Println("Sequence matches")	}	if msg[20+8] == 99 {		fmt.Println("Custom data matches")	}	os.Exit(0)}
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