136 lines
2.9 KiB
Go
136 lines
2.9 KiB
Go
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"encoding/json"
|
|
"flag"
|
|
"fmt"
|
|
"log"
|
|
"net"
|
|
"strconv"
|
|
"time"
|
|
)
|
|
|
|
func packetlength(b ...[]byte) (length int) {
|
|
for _, bytes := range b {
|
|
length += len(bytes)
|
|
}
|
|
return length
|
|
}
|
|
|
|
func handshake(addr string, port int, ver uint64) []byte {
|
|
id := []byte{0x00}
|
|
state := []byte{0x01}
|
|
|
|
version := make([]byte, 2)
|
|
binary.PutUvarint(version, ver)
|
|
p := make([]byte, 2)
|
|
binary.BigEndian.PutUint16(p, uint16(port))
|
|
length := packetlength(id, version, []byte(addr), []byte(p), state) + 1
|
|
|
|
var handshake bytes.Buffer
|
|
handshake.WriteByte(byte(length))
|
|
handshake.Write(id)
|
|
handshake.Write(version)
|
|
handshake.WriteByte(byte(len(addr)))
|
|
handshake.WriteString(addr)
|
|
handshake.Write(p)
|
|
handshake.Write(state)
|
|
return handshake.Bytes()
|
|
}
|
|
|
|
func main() {
|
|
addr := flag.String("addr", "127.0.0.1", "Server address")
|
|
port := flag.Int("port", 25565, "Server Port")
|
|
ver := flag.Uint64("ver", 751, "Minecraft protocol version number")
|
|
flag.Parse()
|
|
|
|
conn, err := net.Dial("tcp", *addr+":"+strconv.Itoa(*port))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
for {
|
|
err := conn.SetWriteDeadline(time.Now().Add(30 * time.Second))
|
|
if err != nil {
|
|
log.Println("WriteDealine failed:", err)
|
|
return
|
|
}
|
|
|
|
conn.Write(handshake(*addr, *port, *ver))
|
|
conn.Write([]byte{0x01, 0x00})
|
|
|
|
recvBuf := make([]byte, 512)
|
|
var resp response
|
|
|
|
err = conn.SetReadDeadline(time.Now().Add(10 * time.Second))
|
|
if err != nil {
|
|
log.Println("SetReadDealine failed:", err)
|
|
return
|
|
}
|
|
|
|
n, err := conn.Read(recvBuf)
|
|
if err != nil {
|
|
if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
|
|
log.Println("read timeout:", err)
|
|
} else {
|
|
log.Println("read error", err)
|
|
}
|
|
}
|
|
|
|
requestright := recvBuf[:n]
|
|
b := bytes.Split(requestright, []byte("{"))
|
|
ne := bytes.SplitAfterN(requestright, b[0], 2)
|
|
after := bytes.TrimSuffix(ne[1], []byte("\x00"))
|
|
|
|
if err := json.Unmarshal(after, &resp); err != nil {
|
|
log.Println(err)
|
|
conn.Close()
|
|
return
|
|
}
|
|
fmt.Printf("Name: %s\nPlayers: %d/%d\nVersion: %s\n",
|
|
resp.Description.Text,
|
|
resp.Players.Online,
|
|
resp.Players.Max,
|
|
resp.Version.Name)
|
|
if resp.Players.Online >= 1 {
|
|
fmt.Println("Online:")
|
|
for _, player := range resp.Players.Sample {
|
|
fmt.Printf("\t%s\n", player.Name)
|
|
}
|
|
}
|
|
|
|
recvBuf = make([]byte, 1)
|
|
start := time.Now()
|
|
conn.Write([]byte{0x01, 0x00})
|
|
_, _ = conn.Read(recvBuf[:])
|
|
diff := time.Now().Sub(start)
|
|
fmt.Printf("Ping: %+v\n", diff)
|
|
if err = conn.Close(); err != nil {
|
|
log.Println(err)
|
|
return
|
|
}
|
|
return
|
|
}
|
|
}
|
|
|
|
type response struct {
|
|
Version struct {
|
|
Name string `json:"name"`
|
|
Protocol int `json:"protocol"`
|
|
} `json:"version"`
|
|
Players struct {
|
|
Max int `json:"max"`
|
|
Online int `json:"online"`
|
|
Sample []struct {
|
|
Name string `json:"name"`
|
|
ID string `json:"id"`
|
|
} `json:"sample"`
|
|
} `json:"players"`
|
|
Description struct {
|
|
Text string `json:"text"`
|
|
} `json:"description"`
|
|
Favicon string `json:"favicon"`
|
|
}
|