msp 0.1.2

Fast and lightweight Minecraft Server protocol client implemented in Rust.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136

use serde::Serialize;

use crate::{
    conf::Conf,
    share::{create_udp_socket, UdpReader},
    MspErr,
};

const MAGIC_BYTES: &[u8] = &[
    0x00, 0xFF, 0xFF, 0x00, 0xFE, 0xFE, 0xFE, 0xFE, 0xFD, 0xFD, 0xFD, 0xFD, 0x12, 0x34, 0x56, 0x78,
];

/// Bedrock server info type.
///
/// For the meaning of `motd_line_1` and `motd_line_2` refer to the following examples and images:
///
/// ```text
/// motd_line_1 = "Dedicated Server"
/// motd_line_2 = "Bedrock level"
/// ```
/// Result:
///
/// <img src="https://wiki.vg/images/b/bb/Server_ID_String_Example.png" alt="Server ID String Example.png" />
#[derive(Serialize, Debug)]
pub struct BedrockServer {
    /// MCPE or MCEE(Education Edition) for Education Edition
    pub edition: String,
    /// MOTD line 1 for upstream display.
    pub motd_line_1: String,
    /// Protocol version.
    pub protocol_version: i32,
    /// Version name.
    pub version_name: String,
    /// Online players.
    pub online_players: i32,
    /// Max players.
    pub max_players: i32,
    /// Server unique id.
    pub server_id: String,
    /// MOTD line 2 for downstream display.
    pub motd_line_2: String,
    /// Game mode.
    pub game_mode: String,
    /// Game mode id.
    pub game_mode_id: u8,
    /// Ports required to connect to the server using IPv4.
    pub port_ipv4: u16,
    /// Ports required to connect to the server using IPv6.
    pub port_ipv6: u16,
}

impl std::fmt::Display for BedrockServer {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "{}",
            serde_json::to_string_pretty(self).map_err(|_| std::fmt::Error)?
        )
    }
}

pub fn get_bedrock_server_status(conf: &Conf) -> Result<BedrockServer, MspErr> {
    let socket = create_udp_socket(&conf.socket_conf)?;

    let packet = [
        // Packet ID
        &[0x01],
        // Time
        [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00].as_slice(),
        // MAGIC
        MAGIC_BYTES,
    ]
    .concat();

    socket.send_to(packet.as_slice(), conf)?;

    let mut udp_reader = UdpReader::create_with_idx(socket, 0);

    match udp_reader.read_bufs(1)?.get(0) {
        Some(&first_buf) if first_buf != 0x1C => {
            return Err(MspErr::DataErr(format!(
                "Packet response excepted start with: 0x1C, but got: 0x{:02X}",
                first_buf
            )));
        }
        Some(_) | None => {}
    };

    // Drop time data(8 bytes)
    udp_reader.set_current_idx_forward(8);

    let _server_guid = udp_reader.read_bufs(8)?;
    let _magic_bytes = udp_reader.read_bufs(16)?;
    let server_info_len = match udp_reader.read_bufs(2)?.try_into() {
        Ok(len) => u16::from_be_bytes(len) as usize,
        Err(_) => {
            return Err(MspErr::DataErr("Cannot convert to u16.".into()));
        }
    };
    let server_info_buf = udp_reader.read_bufs(server_info_len)?;
    let server_info = String::from_utf8_lossy(server_info_buf.as_slice());

    println!("{:?}", server_info);

    let server_info_split = server_info.split(";").collect::<Vec<_>>();

    if server_info_split.len() < 10 {
        return Err(MspErr::DataErr(format!(
            "Expected return at least 10 parts of server information, but {}  were obtained.",
            server_info_split.len()
        )));
    }

    Ok(BedrockServer {
        edition: server_info_split[0].into(),
        motd_line_1: server_info_split[1].into(),
        protocol_version: server_info_split[2].parse()?,
        version_name: server_info_split[3].into(),
        online_players: server_info_split[4].parse()?,
        max_players: server_info_split[5].parse()?,
        server_id: server_info_split[6].into(),
        motd_line_2: server_info_split[7].into(),
        game_mode: server_info_split[8].into(),
        game_mode_id: server_info_split[9].parse()?,
        port_ipv4: if let Some(&p4) = server_info_split.get(10) {
            p4.parse()?
        } else {
            conf.port
        },
        port_ipv6: if let Some(&p6) = server_info_split.get(11) {
            p6.parse()?
        } else {
            0
        },
    })
}