/
pingbench.go
97 lines (84 loc) · 2.74 KB
/
pingbench.go
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package main
//Shamelessly stollen from https://github.com/atomaths/gtug8/blob/master/ping/ping.go
//Function to take a bunch of ips, and determine the least latent ip to connect to...
//Root or GTFO
//Does single ping request
import (
"bytes"
"fmt"
"log"
"net"
"os"
"time"
)
const (
ICMP_ECHO_REQUEST = 8
ICMP_ECHO_REPLY = 0
)
// returns a suitable 'ping request' packet, with id & seq and a
// payload length of pktlen
func makePingRequest(id, seq, pktlen int, filler []byte) []byte {
p := make([]byte, pktlen)
copy(p[8:], bytes.Repeat(filler, (pktlen-8)/len(filler)+1))
p[0] = ICMP_ECHO_REQUEST // type
p[1] = 0 // code
p[2] = 0 // cksum
p[3] = 0 // cksum
p[4] = uint8(id >> 8) // id
p[5] = uint8(id & 0xff) // id
p[6] = uint8(seq >> 8) // sequence
p[7] = uint8(seq & 0xff) // sequence
// calculate icmp checksum
cklen := len(p)
s := uint32(0)
for i := 0; i < (cklen - 1); i += 2 {
s += uint32(p[i+1])<<8 | uint32(p[i])
}
if cklen&1 == 1 {
s += uint32(p[cklen-1])
}
s = (s >> 16) + (s & 0xffff)
s = s + (s >> 16)
// place checksum back in header; using ^= avoids the
// assumption the checksum bytes are zero
p[2] ^= uint8(^s & 0xff)
p[3] ^= uint8(^s >> 8)
return p
}
func singleping(ip string) (time.Duration, error) {
addr := net.IPAddr{IP: net.ParseIP(ip)}
sendid := os.Getpid() & 0xffff
sendseq := 1
pingpktlen := 64
sendpkt := makePingRequest(sendid, sendseq, pingpktlen, []byte("Go Ping"))
ipconn, err := net.DialIP("ip4:icmp", nil, &addr) // *IPConn (Conn 인터페이스 구현)
if err != nil {
log.Fatalf(`net.DialIP("ip4:icmp", %v) = %v`, ipconn, err)
}
ipconn.SetDeadline(time.Now().Add(time.Second)) //1 Second timeout
start := time.Now()
n, err := ipconn.WriteToIP(sendpkt, &addr)
if err != nil || n != pingpktlen {
log.Fatalf(`net.WriteToIP(..., %v) = %v, %v`, addr, n, err)
}
resp := make([]byte, 1024)
_, _, pingerr := ipconn.ReadFrom(resp)
if pingerr != nil {
fmt.Printf("%s : FAIL\n", ip)
} else {
fmt.Printf("%s : %s\n", ip, time.Since(start))
}
// log.Printf("%x", resp)
return time.Since(start), pingerr
}
func main() {
fmt.Printf("Hello\n")
ips := []string{"63.251.19.10", "66.151.47.236", "202.58.141.130", "69.88.149.144", "74.201.53.198", "77.242.195.172", "77.242.195.167", "95.172.71.48", "202.58.15.224", "69.88.149.139", "95.172.71.41", "69.88.149.138", "203.190.126.14", "202.58.15.228", "66.151.147.240", "95.172.71.53", "202.58.141.130", "69.88.149.135", "95.172.71.44", "77.242.195.175", "95.172.71.40", "95.172.71.49"}
for _, ip := range ips {
singleping(ip)
//time.Sleep(time.Second)
}
//go singleping("66.151.47.236")
//go singleping("202.58.141.130")
<-time.After(time.Second * time.Duration(3)) //Wait 3 secs and exit
}