first commit
Signed-off-by: Michael <michael.lindman@gmail.com>
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MIT License Copyright (c) 2020 Michael Lindman
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is furnished
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to do so, subject to the following conditions:
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The above copyright notice and this permission notice (including the next
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paragraph) shall be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
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OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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# mcstatus
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Simple golang app to get the current online status of Minecraft servers
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## Usage
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from a terminal session run `mcstatus` with the address and port arguemnts for the server:
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```sh
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./mcstatus -addr 127.0.0.1 -port 25565
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Name: A Minecraft Server
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Players: 0/20
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Version: 1.16.2
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Ping: 123.698µs
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```
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## Licesne
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```text
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MIT License Copyright (c) 2020 Michael Lindman
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is furnished
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to do so, subject to the following conditions:
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The above copyright notice and this permission notice (including the next
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paragraph) shall be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
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OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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```
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package main
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import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"flag"
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"fmt"
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"log"
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"net"
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"strconv"
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"time"
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)
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func packetlength(b ...[]byte) (length int) {
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for _, bytes := range b {
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length += len(bytes)
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}
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return length
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}
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func handshake(addr string, port int, ver uint64) []byte {
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id := []byte{0x00}
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state := []byte{0x01}
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version := make([]byte, 2)
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binary.PutUvarint(version, ver)
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p := make([]byte, 2)
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binary.BigEndian.PutUint16(p, uint16(port))
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length := packetlength(id, version, []byte(addr), []byte(p), state) + 1
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var handshake bytes.Buffer
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handshake.WriteByte(byte(length))
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handshake.Write(id)
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handshake.Write(version)
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handshake.WriteByte(byte(len(addr)))
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handshake.WriteString(addr)
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handshake.Write(p)
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handshake.Write(state)
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return handshake.Bytes()
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}
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func main() {
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addr := flag.String("addr", "127.0.0.1", "Server address")
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port := flag.Int("port", 25565, "Server Port")
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ver := flag.Uint64("ver", 751, "Minecraft protocol version number")
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flag.Parse()
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conn, err := net.Dial("tcp", *addr+":"+strconv.Itoa(*port))
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if err != nil {
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log.Fatal(err)
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}
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for {
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err := conn.SetWriteDeadline(time.Now().Add(30 * time.Second))
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if err != nil {
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log.Println("WriteDealine failed:", err)
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return
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}
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conn.Write(handshake(*addr, *port, *ver))
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conn.Write([]byte{0x01, 0x00})
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recvBuf := make([]byte, 512)
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var resp response
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err = conn.SetReadDeadline(time.Now().Add(10 * time.Second))
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if err != nil {
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log.Println("SetReadDealine failed:", err)
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return
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}
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n, err := conn.Read(recvBuf)
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if err != nil {
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if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
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log.Println("read timeout:", err)
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} else {
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log.Println("read error", err)
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}
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}
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requestright := recvBuf[:n]
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b := bytes.Split(requestright, []byte("{"))
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ne := bytes.SplitAfterN(requestright, b[0], 2)
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after := bytes.TrimSuffix(ne[1], []byte("\x00"))
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if err := json.Unmarshal(after, &resp); err != nil {
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log.Println(err)
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conn.Close()
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return
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}
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fmt.Printf("Name: %s\nPlayers: %d/%d\nVersion: %s\n",
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resp.Description.Text,
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resp.Players.Online,
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resp.Players.Max,
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resp.Version.Name)
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if resp.Players.Online >= 1 {
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fmt.Println("Online:")
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for _, player := range resp.Players.Sample {
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fmt.Printf("\t%s\n", player.Name)
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}
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}
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recvBuf = make([]byte, 1)
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start := time.Now()
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conn.Write([]byte{0x01, 0x00})
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_, _ = conn.Read(recvBuf[:])
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diff := time.Now().Sub(start)
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fmt.Printf("Ping: %+v\n", diff)
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if err = conn.Close(); err != nil {
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log.Println(err)
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return
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}
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return
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}
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}
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type response struct {
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Version struct {
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Name string `json:"name"`
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Protocol int `json:"protocol"`
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} `json:"version"`
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Players struct {
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Max int `json:"max"`
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Online int `json:"online"`
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Sample []struct {
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Name string `json:"name"`
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ID string `json:"id"`
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} `json:"sample"`
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} `json:"players"`
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Description struct {
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Text string `json:"text"`
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} `json:"description"`
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Favicon string `json:"favicon"`
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}
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