/
goping.go
80 lines (73 loc) · 1.66 KB
/
goping.go
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package main
import (
"fmt"
"golang.org/x/net/icmp"
"golang.org/x/net/ipv4"
"log"
"net"
"os"
"time"
)
var targetIP = ""
var ipaddr = ""
func init() {
if len(os.Args) > 1 {
targetIP = os.Args[1]
fmt.Println("Sending ICMP echo request to ", targetIP)
} else {
targetIP = "8.8.8.8"
fmt.Println("Sending ICMP echo request to ", targetIP)
}
}
func checkError(err error, message string) {
if err != nil {
logMessage := message + " " + err.Error()
log.Fatalf(logMessage)
}
}
func main() {
timeout := 5
t1 := time.Now()
c, err := icmp.ListenPacket("ip4:icmp", "0.0.0.0")
if err != nil {
checkError(err, "listen err, ")
}
c.SetDeadline(t1.Add(time.Second * time.Duration(timeout)))
defer c.Close()
wm := icmp.Message{
Type: ipv4.ICMPTypeEcho, Code: 0,
Body: &icmp.Echo{
ID: os.Getpid() & 0xffff, Seq: 1,
Data: []byte("HELLO-R-U-THERE"),
},
}
wb, err := wm.Marshal(nil)
if err != nil {
log.Fatal(err)
}
// Send ICMP echo and start timer
starttime := time.Now()
if _, err := c.WriteTo(wb, &net.IPAddr{IP: net.ParseIP(targetIP)}); err != nil {
log.Fatalf("WriteTo err, %s", err)
}
rb := make([]byte, 1500)
// Look for ICMP response and stop time
n, peer, err := c.ReadFrom(rb)
stoptime := time.Now()
if err != nil {
log.Fatal(err)
}
//rm, err := icmp.ParseMessage(iana.ProtocolICMP, rb[:n])
rm, err := icmp.ParseMessage(1, rb[:n])
if err != nil {
log.Fatal(err)
}
switch rm.Type {
case ipv4.ICMPTypeEchoReply:
log.Printf("got reflection from %v", peer)
log.Printf("ICMP echo request sent on ", starttime)
log.Printf("ICMP echo response received on ", stoptime)
default:
log.Printf("got %+v; want echo reply", rm)
}
}