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version = "1.42.0", features = ["rt", "macros", "net", "sync", "rt-multi-thread", "io-util", "io-std"] } +tracing = "0.1.41" +tracing-subscriber = { version = "0.3.19", features = ["env-filter"] } +xtra = { version = "0.6.0", features = ["macros", "tokio"] } +zerocopy = { version = "0.8.13", features = ["derive"] } diff --git a/flake.lock b/flake.lock new file mode 100644 index 0000000..f0cbe6d --- /dev/null +++ b/flake.lock @@ -0,0 +1,100 @@ +{ + "nodes": { + "fenix": { + "inputs": { + "nixpkgs": [ + "nixpkgs" + ], + "rust-analyzer-src": "rust-analyzer-src" + }, + "locked": { + "lastModified": 1734244366, + "narHash": "sha256-5sH3pvXDP9ifPGiuFu9OkUSw0hnL2BAabdkXogsn3AU=", + "owner": "nix-community", + "repo": "fenix", + "rev": "e61b6fb56bc8471ad64f8d3eb9dde5b6e0d7ffcd", + "type": "github" + }, + "original": { + "owner": "nix-community", + "repo": "fenix", + "type": "github" + } + }, + "flake-utils": { + "inputs": { + "systems": "systems" + }, + "locked": { + "lastModified": 1731533236, + "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=", + "owner": "numtide", + "repo": "flake-utils", + "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b", + "type": "github" + }, + "original": { + "owner": "numtide", + "repo": "flake-utils", + "type": "github" + } + }, + "nixpkgs": { + "locked": { + "lastModified": 1734119587, + "narHash": "sha256-AKU6qqskl0yf2+JdRdD0cfxX4b9x3KKV5RqA6wijmPM=", + "owner": "NixOS", + "repo": "nixpkgs", + "rev": "3566ab7246670a43abd2ffa913cc62dad9cdf7d5", + "type": "github" + }, + "original": { + "owner": "NixOS", + "ref": "nixos-unstable", + "repo": "nixpkgs", + "type": "github" + } + }, + "root": { + "inputs": { + "fenix": "fenix", + "flake-utils": "flake-utils", + "nixpkgs": "nixpkgs" + } + }, + "rust-analyzer-src": { + "flake": false, + "locked": { + "lastModified": 1734121833, + "narHash": "sha256-EZtwXmh9P9FnoXKfbjGxyWksjrjPB4HES2HVIV+STNg=", + "owner": "rust-lang", + "repo": "rust-analyzer", + "rev": "fc18d263aa95f7d6de8174bd4c6663dfe865e6d5", + "type": "github" + }, + "original": { + "owner": "rust-lang", + "ref": "nightly", + "repo": "rust-analyzer", + "type": "github" + } + }, + "systems": { + "locked": { + "lastModified": 1681028828, + "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=", + "owner": "nix-systems", + "repo": "default", + "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e", + "type": "github" + }, + "original": { + "owner": "nix-systems", + "repo": "default", + "type": "github" + } + } + }, + "root": "root", + "version": 7 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..e2d1263 --- /dev/null +++ b/flake.nix @@ -0,0 +1,30 @@ +{ + inputs = { + nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; + flake-utils.url = "github:numtide/flake-utils"; + fenix = { + url = "github:nix-community/fenix"; + inputs.nixpkgs.follows = "nixpkgs"; + }; + }; + outputs = { self, nixpkgs, flake-utils, fenix }: + flake-utils.lib.eachDefaultSystem + (system: + let + overlays = [ fenix.overlays.default ]; + pkgs = import nixpkgs { + inherit system overlays; + }; + in + with pkgs; + { + devShells.default = mkShell { + buildInputs = [ + pkgs.fenix.stable.completeToolchain + pkg-config + openssl + ]; + }; + } + ); +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..7c89326 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,38 @@ +pub mod packet; +pub mod player; + +use std::{collections::HashMap, sync::LazyLock}; + +use player::PlayerActor; +use tokio::{net::TcpListener, sync::RwLock}; +use tracing::{error, info}; +use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt}; +use xtra::Address; + +pub fn clients() -> &'static RwLock>> { + static CLIENTS: LazyLock>>> = LazyLock::new(|| RwLock::default()); + + &CLIENTS +} + +#[tokio::main] +async fn main() { + //.with(EnvFilter::from_default_env()) + tracing_subscriber::registry().with(tracing_subscriber::fmt::layer()).init(); + let tcp = TcpListener::bind("0.0.0.0:1027").await.unwrap(); + + info!("listening on port 1027"); + loop { + match tcp.accept().await { + Ok((stream, addr)) => { + PlayerActor::new_connection(stream, addr); + } + Err(error) => { + error!("failed to handle connection: {error:?}"); + } + } + } + + // let socket = Arc::new(UdpSocket::bind("0.0.0.0:1027").await.unwrap()); + // let mut packet = [0u8; 1024]; +} diff --git a/src/packet.rs b/src/packet.rs new file mode 100644 index 0000000..12b9b95 --- /dev/null +++ b/src/packet.rs @@ -0,0 +1,213 @@ +use core::str; +use std::{ + ffi::CStr, + fmt::{Debug, Display}, +}; + +use anyhow::{bail, Context}; +use newtype_enum::newtype_enum; +use zerocopy::{ + FromBytes, FromZeros, Immutable, IntoBytes, KnownLayout, Unaligned, +}; + +#[derive(Debug, Clone, Copy, FromZeros, IntoBytes, KnownLayout, Immutable)] +#[repr(C, packed)] +pub struct PacketHeader { + pub user_id: u128, + pub kind: PacketKind, + pub size: u16, +} + +#[derive(Debug, Clone, Copy, FromZeros, IntoBytes, KnownLayout, Immutable)] +#[repr(u16)] +pub enum PacketKind { + Unknown = 0, + Init = 1, + Player = 2, + Cap = 3, + Game = 4, + Tag = 5, + Connect = 6, + Disconnect = 7, + Costume = 8, + Shine = 9, + Capture = 10, + ChangeStage = 11, + Command = 12, + UdpInit = 13, + HolePunch = 14 +} + +const COSTUME_NAME_SIZE: usize = 0x20; +const CAP_ANIM_SIZE: usize = 0x30; +const STAGE_GAME_NAME_SIZE: usize = 0x40; +const STAGE_CHANGE_NAME_SIZE: usize = 0x30; +const STAGE_ID_SIZE: usize = 0x10; +const CLIENT_NAME_SIZE: usize = COSTUME_NAME_SIZE; + +#[derive(Debug)] +pub struct Packet { + pub user_id: u128, + pub data: PacketData, +} + +#[newtype_enum] +#[derive(Debug)] +pub enum PacketData { + Unknown(Vec), + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Init { + pub max_players: u16, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Player { + position: [f32; 3], + rotation: [f32; 4], + weights: [f32; 6], + action: u16, + subaction: u16, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Cap { + position: [f32; 3], + rotation: [f32; 4], + out: Bool, + anim: String, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Game { + is_2d: u8, + scenario_num: u8, + stage: String, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Tag { + update_type: u8, + is_it: Bool, + seconds: u8, + minutes: u16, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Connect { + kind: ConnectionKind, + max_player: u16, + client_name: String, + }, + Disconnect, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Costume { + body_name: String, + cap_name: String, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Shine { + shine_id: i32, + is_grand: Bool, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + Capture { + model: String, + }, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + ChangeStage { + stage: String, + id: String, + scenario: i8, + sub_scenario: u8, + }, + Command, + #[derive(FromZeros, IntoBytes, KnownLayout, Immutable)] + #[repr(C, packed)] + UdpInit { + port: u16 + }, + HolePunch +} + +pub enum TagUpdateBit { + Time = 0, + State = 1, +} + +#[derive(Clone, Copy, Debug, PartialEq, Eq, FromZeros, IntoBytes, KnownLayout, Immutable)] +#[repr(u32)] +pub enum ConnectionKind { + New = 0, + Old = 1, +} + +#[derive(Clone, Copy, Debug, PartialEq, Eq, FromBytes, IntoBytes, KnownLayout, Immutable, Unaligned)] +#[repr(C)] +pub struct Bool(u8); + +impl Bool { + pub fn new(value: bool) -> Bool { + Bool(if value { 1 } else { 0 }) + } + pub fn get(&self) -> bool { + self.0 != 0 + } +} + +impl From for Bool { + fn from(value: bool) -> Self { + Bool::new(value) + } +} + +impl From for bool { + fn from(value: Bool) -> Self { + value.get() + } +} + +#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, FromBytes, IntoBytes, KnownLayout, Immutable, Unaligned)] +#[repr(C)] +pub struct String([u8; N]); + +impl String { + pub fn to_str(&self) -> anyhow::Result<&str> { + let cstr = CStr::from_bytes_until_nul(&self.0).context("interpreting bytes as c-string")?; + cstr.to_str().context("verifying string has utf-8") + // let str = str::from_utf8(&self.0).context("verifying string has utf-8")?; + // Ok(str.trim_end_matches('\0')) + } + pub fn assert_valid(&self) -> anyhow::Result<()> { + self.to_str().map(drop) + } +} + +impl TryFrom<&str> for String { + type Error = anyhow::Error; + fn try_from(value: &str) -> Result { + let mut buf = [0; N]; + if value.len() > N { + bail!("seggs") + } + + value.write_to_prefix(&mut buf).unwrap(); + + Ok(Self(buf)) + } +} + +impl Display for String { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + Display::fmt(self.to_str().expect("failed to parse string"), f) + } +} +impl Debug for String { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + Debug::fmt(self.to_str().expect("failed to parse string"), f) + } +} diff --git a/src/player.rs b/src/player.rs new file mode 100644 index 0000000..3317b95 --- /dev/null +++ b/src/player.rs @@ -0,0 +1,183 @@ +use std::{net::SocketAddr, time::Duration}; + +use anyhow::{bail, Context}; +use tokio::{ + io::{AsyncReadExt, AsyncWriteExt, BufReader, BufWriter}, + net::{ + tcp::{OwnedReadHalf, OwnedWriteHalf}, + TcpStream, + }, sync::mpsc, time::Instant, +}; +use tracing::{info, info_span, trace, Instrument}; +use zerocopy::{IntoBytes, TryFromBytes}; + +use crate::packet::{ + Packet, PacketData, + PacketData_variants::{Cap, Command, Connect, Disconnect, HolePunch, Init, Player}, + PacketHeader, PacketKind, String, +}; + +// #[derive(Actor)] +pub struct PlayerActor { + write_half: BufWriter, +} + +impl PlayerActor { + pub async fn read_packet(reader: &mut BufReader) -> anyhow::Result { + let mut header = [0; size_of::()]; + reader.read_exact(&mut header).await.context("reading data")?; + let Ok(header) = PacketHeader::try_read_from_bytes(&header) else { + bail!("parsing packet buffer") + }; + + macro_rules! read_data { + ($read: expr, $size: expr, $ty: ident $(, $field:ident => $assert: expr)*) => {{ + async fn read_data(reader: &mut BufReader, size: u16) -> anyhow::Result { + type T = crate::packet::PacketData_variants::$ty; + let size = size as usize; + if size < size_of::() { + bail!("buffer too small for packet: expected {}, got {size}", size_of::()) + } + let mut data = [0; u16::MAX as usize]; + reader.read_exact(&mut data[..size]).await.context("reading data")?; + let packet_data = match T::try_read_from_bytes(&data[..size_of::()]) { + Ok(data) => data, + Err(error) => { + bail!(concat!("interpreting ", stringify!($ty), ": {:?}"), error) + } + }; + + $( + { + let $field = packet_data.$field; + $assert + }?; + )* + Ok(PacketData::$ty(packet_data)) + } + type _FixIntellisense = crate::packet::PacketData_variants::$ty; + read_data($read, $size).await? + }}; + } + + let data: PacketData = match header.kind { + PacketKind::Unknown => { + let mut data = vec![0; header.size.into()]; + reader.read_exact(&mut data).await.context("reading unknown data")?; + PacketData::Unknown(data) + } + PacketKind::Init => read_data!(reader, header.size, Init), + PacketKind::Player => read_data!(reader, header.size, Player), + PacketKind::Cap => read_data!(reader, header.size, Cap, anim => anim.assert_valid()), + PacketKind::Game => read_data!(reader, header.size, Game, stage => stage.assert_valid()), + PacketKind::Tag => read_data!(reader, header.size, Tag), + PacketKind::Connect => read_data!(reader, header.size, Connect), + PacketKind::Disconnect => PacketData::Disconnect(Disconnect), + PacketKind::Costume => read_data!(reader, header.size, Costume), + PacketKind::Shine => read_data!(reader, header.size, Shine), + PacketKind::Capture => read_data!(reader, header.size, Capture), + PacketKind::ChangeStage => read_data!(reader, header.size, ChangeStage), + PacketKind::Command => PacketData::Command(Command), + PacketKind::UdpInit => read_data!(reader, header.size, UdpInit), + PacketKind::HolePunch => PacketData::HolePunch(HolePunch), + }; + + Ok(Packet { + user_id: header.user_id, + data, + }) + } + + pub async fn write_packet(writer: &mut BufWriter, id: u128, data: PacketData) -> anyhow::Result<()> { + let (kind, slice) = match &data { + PacketData::Unknown(vec) => { + if vec.len() >= (u16::MAX as usize) { + bail!("unknown packet vec too large") + } + (PacketKind::Unknown, vec.as_slice()) + } + PacketData::Init(init) => (PacketKind::Init, init.as_bytes()), + PacketData::Player(player) => (PacketKind::Player, player.as_bytes()), + PacketData::Cap(cap) => (PacketKind::Cap, cap.as_bytes()), + PacketData::Game(game) => (PacketKind::Game, game.as_bytes()), + PacketData::Tag(tag) => (PacketKind::Tag, tag.as_bytes()), + PacketData::Connect(connect) => (PacketKind::Connect, connect.as_bytes()), + PacketData::Disconnect(..) => (PacketKind::Disconnect, [].as_slice()), + PacketData::Costume(costume) => (PacketKind::Costume, costume.as_bytes()), + PacketData::Shine(shine) => (PacketKind::Shine, shine.as_bytes()), + PacketData::Capture(capture) => (PacketKind::Capture, capture.as_bytes()), + PacketData::ChangeStage(change_stage) => (PacketKind::ChangeStage, change_stage.as_bytes()), + PacketData::Command(..) => (PacketKind::Command, [].as_slice()), + PacketData::UdpInit(udp_init) => (PacketKind::UdpInit, udp_init.as_bytes()), + PacketData::HolePunch(..) => (PacketKind::HolePunch, [].as_slice()), + }; + + writer + .write_all( + PacketHeader { + kind, + size: slice.len() as u16, + user_id: id, + } + .as_bytes(), + ) + .await + .context("writing header")?; + writer.write_all(slice).await.context("writing data")?; + writer.flush().await.context("flushing writer") + } + + pub fn new_connection(stream: TcpStream, addr: SocketAddr) { + tokio::spawn(async move { + info!("accepted connection from {addr}"); + let (reader, writer) = stream.into_split(); + let mut reader = BufReader::new(reader); + let mut writer = BufWriter::new(writer); + let packet = Self::read_packet(&mut reader).await.unwrap(); + let Packet { + user_id, + data: PacketData::Connect(connect), + } = packet + else { + tracing::error!("not a valid player!"); + return; + }; + + let bot_id = user_id + 1; + Self::write_packet(&mut writer, user_id, PacketData::Init(Init { max_players: 8 })) + .await + .expect("msfrarausfhsdagsdgkog"); + Self::write_packet(&mut writer, bot_id, PacketData::Connect(Connect { kind: crate::packet::ConnectionKind::New, client_name: String::try_from("Bot").unwrap(), max_player: 8 })) + .await + .expect("msfrarausfhsdagsdgkog"); + + let span = info_span!("", player = connect.client_name.to_string()); + let (sender, mut receiver) = mpsc::unbounded_channel(); + tokio::spawn(async move { + while let Some((instant, packet)) = receiver.recv().await { + tokio::time::sleep_until(instant).await; + Self::write_packet(&mut writer, bot_id, packet).await.unwrap(); + } + }.instrument(span.clone())); + + async move { + info!("connected {user_id}"); + + loop { + let packet = Self::read_packet(&mut reader).await.unwrap(); + trace!("got packet {packet:?}"); + let sender = sender.clone(); + tokio::spawn(async move { + let _ = sender.send((Instant::now().checked_add(Duration::from_millis(200)).unwrap(), match packet.data { + PacketData::Player(player) => PacketData::Player(Player {position: [player.position[0], -20., player.position[2]], ..player}), + PacketData::Cap(cap) => PacketData::Cap(Cap {position: [cap.position[0], -20., cap.position[2]], ..cap}), + pass => pass, + })); + }); + } + } + .instrument(span) + .await; + }); + } +}