package main
import (
"net"
"fmt"
"time"
"sync"
)
// Internal port: 19132
var hosts = []HostEntry{
{"h.woozle.org:26548", "Ginnie"},
{"n.dirtbags.net:29837", "Neale"},
}
const MAGIC = "\x00\xff\xff\x00\xfe\xfe\xfe\xfe\xfd\xfd\xfd\xfd\x12\x34\x56\x78"
func isAlive(host string) bool {
conn, err := net.Dial("udp", host)
if err != nil {
return false
}
conn.SetReadDeadline(time.Now().Add(5 * time.Second))
pkt := "\x01" + "\x00\x00\x00\x00MERF" + MAGIC
conn.Write([]byte(pkt))
resp := make([]byte, 40)
rlen, err := conn.Read(resp)
if (err != nil) || (rlen == 0) {
return false
}
return true
}
var wg sync.WaitGroup
func waitClose(c chan<- string) {
wg.Wait()
close(c)
}
type HostEntry struct {
host string
owner string
}
func ping(results chan<- string, e HostEntry) {
defer wg.Done()
if isAlive(e.host) {
results <- e.owner
}
}
func main() {
results := make(chan string, 5)
for _, host := range hosts {
wg.Add(1)
go ping(results, host)
}
go waitClose(results)
fmt.Println("Content-type: text/html")
fmt.Println("")
fmt.Println("")
fmt.Println("")
fmt.Println("")
fmt.Println("")
fmt.Println("")
fmt.Println("Minecraft PE ping")
fmt.Println("")
fmt.Println("Who is playing Minecraft PE?
")
fmt.Println("")
count := 0
for msg := range results {
fmt.Printf("- %s
\n", msg)
count += 1
}
fmt.Println("
")
if count == 0 {
fmt.Println("Sorry, looks like nobody's playing right now.
")
}
fmt.Println("")
}