89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
package main
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import (
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"net"
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"fmt"
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"time"
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"sync"
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)
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var hosts = []HostEntry{
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{"h.woozle.org:30919", "Ginnie (tablet)"},
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{"h.woozle.org:44321", "Ginnie"},
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{"h.woozle.org:58000", "Amy"},
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{"h.woozle.org:29837", "Neale"},
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}
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const MAGIC = "\x00\xff\xff\x00\xfe\xfe\xfe\xfe\xfd\xfd\xfd\xfd\x12\x34\x56\x78"
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func isAlive(host string) bool {
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conn, err := net.Dial("udp", host)
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if err != nil {
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return false
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}
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conn.SetReadDeadline(time.Now().Add(5 * time.Second))
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pkt := "\x01" + "\x00\x00\x00\x00MERF" + MAGIC
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conn.Write([]byte(pkt))
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resp := make([]byte, 40)
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rlen, err := conn.Read(resp)
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if (err != nil) || (rlen == 0) {
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return false
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}
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return true
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}
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var wg sync.WaitGroup
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func waitClose(c chan<- string) {
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wg.Wait()
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close(c)
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}
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type HostEntry struct {
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host string
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owner string
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}
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func ping(results chan<- string, e HostEntry) {
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defer wg.Done()
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if isAlive(e.host) {
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results <- fmt.Sprintf("%s is playing at %s", e.owner, e.host)
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}
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}
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func main() {
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results := make(chan string, 5)
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for _, host := range hosts {
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wg.Add(1)
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go ping(results, host)
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}
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go waitClose(results)
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fmt.Println("Content-type: text/html")
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fmt.Println("")
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fmt.Println("<!DOCTYPE html>")
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fmt.Println("<html>")
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fmt.Println("<head>")
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fmt.Println("<meta name=\"viewport\" content=\"width=device-width\">")
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fmt.Println("<style type=\"text/css\">#a{font-size: 120%; background: silver;}</style>")
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fmt.Println("<title>Minecraft PE ping</title></head>")
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fmt.Println("<body>")
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fmt.Println("<h1>Are The Picketts playing Minecraft PE?</h1>")
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fmt.Println("<ul id=\"a\">")
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count := 0
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for msg := range results {
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fmt.Printf("<li>%s</li>\n", msg)
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count += 1
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}
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fmt.Println("</ul>")
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if count == 0 {
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fmt.Println("<p>Sorry, looks like nobody's playing right now.</p>")
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}
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fmt.Println("</body></html>")
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}
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