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main.rs
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366 lines (337 loc) · 11.6 KB
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use std::fmt::{Display, Formatter};
use std::io::{Read, Write};
use std::net::SocketAddr;
use std::net::{TcpListener, TcpStream};
use std::num::ParseIntError;
use std::sync::{Arc, Mutex};
use anyhow::Context;
use clap::{ArgEnum, Parser};
use colored::Colorize;
use log::{Level, LevelFilter};
use time::macros::format_description;
use time::OffsetDateTime;
use feather_protocol::codec::CompressionThreshold;
use feather_protocol::packets::client::HandshakeState;
use feather_protocol::{
ClientHandshakePacket, ClientPacket, ClientPacketCodec, ProtocolState, ServerLoginPacket,
ServerPacket, ServerPacketCodec, VarInt,
};
/// A simple proxy server that logs transmitted packets
#[derive(Parser)]
#[clap(about, version)]
struct Args {
/// The Minecraft server address (ip:port)
#[clap(short = 'a', long)]
server_address: SocketAddr,
/// The address that the proxy should listen on (ip:port)
#[clap(short, long)]
proxy_address: SocketAddr,
/// Only log clientside/serverside packets
#[clap(arg_enum, short, long, default_value_t)]
side: ConnectionSide,
/// Show the contents of the packets. `-vv` will also display hexdump
#[clap(short, long, parse(from_occurrences))]
verbose: usize,
/// Don't log packets with the specified IDs (hexadecimal, comma-separated)
#[clap(short, long, use_delimiter = true, parse(try_from_str = parse_hex), conflicts_with = "whitelist")]
blacklist: Option<Vec<u32>>,
/// Log only packets with the specified IDs (hexadecimal, comma-separated)
#[clap(short, long, use_delimiter = true, parse(try_from_str = parse_hex), conflicts_with = "blacklist")]
whitelist: Option<Vec<u32>>,
}
fn parse_hex(src: &str) -> Result<u32, ParseIntError> {
u32::from_str_radix(src, 16)
}
#[derive(ArgEnum, Copy, Clone)]
enum ConnectionSide {
Client,
Server,
Both,
}
impl Default for ConnectionSide {
fn default() -> Self {
ConnectionSide::Both
}
}
fn main() {
let args: Args = Args::parse();
fern::Dispatch::new()
.format(|out, message, record| {
let level_string = match record.level() {
Level::Error => record.level().to_string().red(),
Level::Warn => record.level().to_string().yellow(),
Level::Info => record.level().to_string().cyan(),
Level::Debug => record.level().to_string().purple(),
Level::Trace => record.level().to_string().normal(),
};
let target = if !record.target().is_empty() {
record.target()
} else {
record.module_path().unwrap_or_default()
};
let datetime: OffsetDateTime =
OffsetDateTime::now_local().unwrap_or_else(|_| OffsetDateTime::now_utc());
out.finish(format_args!(
"{} {:<5} [{}] {}",
datetime
.format(format_description!(
"[year]-[month]-[day] [hour]:[minute]:[second],[subsecond digits:3]"
))
.unwrap(),
level_string,
target,
message,
));
})
.level(match args.verbose {
0 => LevelFilter::Info,
1 => LevelFilter::Debug,
_ => LevelFilter::Trace,
})
.chain(std::io::stdout())
.apply()
.unwrap();
let listener = TcpListener::bind(args.proxy_address).unwrap();
log::info!("Listening on {}", args.proxy_address);
while let Ok((client, addr)) = listener.accept() {
log::info!("Accepting connection from {}", addr);
let server = match TcpStream::connect(args.server_address) {
Ok(server) => server,
Err(err) => {
log::error!(
"failed to connect to server at {}: {}",
args.server_address,
err
);
continue;
}
};
let connection = Arc::new(Mutex::new(Connection {
username: None,
client_codec: ClientPacketCodec::new(),
server_codec: ServerPacketCodec::new(),
}));
let client_read = client;
let client_write = client_read.try_clone().unwrap();
let server_read = server;
let server_write = server_read.try_clone().unwrap();
std::thread::spawn({
let connection = connection.clone();
let blacklist = args.blacklist.clone();
let whitelist = args.whitelist.clone();
move || match handle_client(
matches!(args.side, ConnectionSide::Both | ConnectionSide::Client),
blacklist,
whitelist,
&connection,
client_read,
server_write,
) {
Ok(()) => {
log::info!(
"{}: client disconnected",
connection
.lock()
.unwrap()
.username
.clone()
.unwrap_or_default()
);
}
Err(err) => {
log::error!("Client error: {:?}", err);
}
}
});
std::thread::spawn({
let connection = connection.clone();
let blacklist = args.blacklist.clone();
let whitelist = args.whitelist.clone();
move || match handle_server(
matches!(args.side, ConnectionSide::Both | ConnectionSide::Server),
blacklist,
whitelist,
&connection,
server_read,
client_write,
) {
Ok(()) => {
log::info!(
"{}: server disconnected",
connection
.lock()
.unwrap()
.username
.clone()
.unwrap_or_default()
)
}
Err(err) => {
log::error!("Server error: {:?}", err);
}
}
});
}
}
struct Connection {
/// The client's username.
username: Option<PlayerName>,
client_codec: ClientPacketCodec,
server_codec: ServerPacketCodec,
}
impl Connection {
fn set_state(&mut self, state: ProtocolState) {
log::info!(
"{}: switching to state {:?}",
self.username.clone().unwrap_or_default(),
state
);
self.client_codec.set_state(state);
self.server_codec.set_state(state);
}
fn set_compression(&mut self, threshold: CompressionThreshold) {
self.client_codec.set_compression(threshold);
self.server_codec.set_compression(threshold);
}
}
#[derive(Clone)]
struct PlayerName(String);
impl Default for PlayerName {
fn default() -> Self {
PlayerName("<unknown>".to_string())
}
}
impl Display for PlayerName {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str(&self.0)
}
}
fn handle_client(
log: bool,
blacklist: Option<Vec<u32>>,
whitelist: Option<Vec<u32>>,
connection: &Arc<Mutex<Connection>>,
mut client_read: TcpStream,
mut server_write: TcpStream,
) -> anyhow::Result<()> {
loop {
let length = VarInt::read_from(&mut client_read)
.map(|var_int| var_int.0)
.unwrap_or_default();
if length == 0 {
break;
}
let mut buf = vec![0; length as usize];
client_read.read_exact(&mut buf)?;
let mut vec = Vec::new();
VarInt(length).write_to(&mut vec)?;
vec.extend(buf);
if vec.is_empty() {
break;
}
let mut connection = connection.lock().unwrap();
if let Some(packet) = connection
.client_codec
.decode(&vec)
.context("failed to decode client packet")?
{
if log && !hide(packet.id(), blacklist.as_ref(), whitelist.as_ref()) {
log::info!(
"{} -> #{:02X}",
connection.username.clone().unwrap_or_default(),
packet.id()
);
log::debug!(
"{} -> {:?}",
connection.username.clone().unwrap_or_default(),
packet
);
log::trace!("{}", pretty_hex::pretty_hex(&&vec));
}
// Detect state switches.
if let ClientPacket::Handshake(packet) = packet {
let state = match packet {
ClientHandshakePacket::Handshake(packet) => match packet.next_state {
HandshakeState::Login => ProtocolState::Login,
HandshakeState::Status => ProtocolState::Status,
},
};
connection.set_state(state)
}
drop(connection);
// Forward the packet to the server.
server_write.write_all(&vec)?;
}
}
Ok(())
}
fn handle_server(
log: bool,
blacklist: Option<Vec<u32>>,
whitelist: Option<Vec<u32>>,
connection: &Arc<Mutex<Connection>>,
mut server_read: TcpStream,
mut client_write: TcpStream,
) -> anyhow::Result<()> {
loop {
let length = VarInt::read_from(&mut server_read)
.map(|var_int| var_int.0)
.unwrap_or_default();
if length == 0 {
break;
}
let mut buf = vec![0; length as usize];
server_read.read_exact(&mut buf)?;
let mut vec = Vec::new();
VarInt(length).write_to(&mut vec)?;
vec.extend(buf);
if vec.is_empty() {
break;
}
let mut connection = connection.lock().unwrap();
if let Some(packet) = connection
.server_codec
.decode(&vec)
.context("failed to decode client packet")?
{
if log && !hide(packet.id(), blacklist.as_ref(), whitelist.as_ref()) {
log::info!(
"{} <- #{:02X}",
connection.username.clone().unwrap_or_default(),
packet.id()
);
log::debug!(
"{} <- {:?}",
connection.username.clone().unwrap_or_default(),
packet
);
log::trace!("{}", pretty_hex::pretty_hex(&&vec));
}
match packet {
// Detect state switches
ServerPacket::Login(ServerLoginPacket::LoginSuccess(packet)) => {
connection.username = Some(PlayerName(packet.username));
connection.set_state(ProtocolState::Play);
}
// Detect SetCompression
ServerPacket::Login(ServerLoginPacket::SetCompression(packet)) => {
connection.set_compression(packet.threshold as CompressionThreshold)
}
_ => (),
}
drop(connection);
// Forward the packet to the server.
client_write.write_all(&vec)?;
}
}
Ok(())
}
fn hide(packet_id: u32, blacklist: Option<&Vec<u32>>, whitelist: Option<&Vec<u32>>) -> bool {
if let Some(blacklist) = blacklist {
blacklist.contains(&packet_id)
} else if let Some(whitelist) = whitelist {
!whitelist.contains(&packet_id)
} else {
false
}
}