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Arlo Filley 2023-08-27 21:14:19 +01:00
parent 955a74de63
commit 7fab25ea9f
8 changed files with 146 additions and 188 deletions
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1
Cargo.toml
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@ -8,7 +8,6 @@ description = "A BitTorrent client implemented in Rust that allows you to intera
authors = ["Arlo Filley <filleyarlo@gmail.com>"]
exclude = ["testing/", "process/", ".vscode/", ".DS_STORE"]
license = "MIT"
license-file = "LICENSE"
keywords = ["bittorrent", "torrent", "torrentclient"]
readme = "README.md"
repository = "https://github.com/arlofilley/rusty_torrent"

2
src/files.rs
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@ -53,7 +53,7 @@ impl Files {
for dir in &t_file.path[..t_file.path.len() - 1] {
path.push('/');
path.push_str(&dir);
path.push_str(dir);
if !dir_exists(&path).await.unwrap() {
debug!("Creating: {path}");

50
src/handshake.rs
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@ -1,4 +1,4 @@
use log::{debug, error};
use log::{ info, error };
/// Represents the handshake message that will be sent to a client.
#[derive(Debug)]
@ -25,17 +25,17 @@ impl Handshake {
/// # Returns
///
/// A new `Handshake` instance on success, or an empty `Result` indicating an error.
pub fn new(info_hash: Vec<u8>) -> Result<Self, ()> {
pub fn new(info_hash: &[u8]) -> Option<Self> {
if info_hash.len() != 20 {
error!("Incorrect infohash length, consider using the helper function in torrent");
return Err(());
return None;
}
Ok(Self {
Some(Self {
p_str_len: 19,
p_str: String::from("BitTorrent protocol"),
reserved: [0; 8],
info_hash,
info_hash: info_hash.to_vec(),
peer_id: String::from("-MY0001-123456654322")
})
}
@ -49,22 +49,10 @@ impl Handshake {
let mut buf: Vec<u8> = vec![0; 68];
buf[0] = self.p_str_len;
for i in 1..20 {
buf[i] = self.p_str.as_bytes()[i - 1];
}
for i in 21..28 {
buf[i] = self.reserved[i - 21]
}
for i in 28..48 {
buf[i] = self.info_hash[i - 28]
}
for i in 48..68 {
buf[i] = self.peer_id.as_bytes()[i - 48]
}
buf[1..20].copy_from_slice(&self.p_str.as_bytes()[..19]);
buf[21..28].copy_from_slice(&self.reserved[..7]);
buf[28..48].copy_from_slice(&self.info_hash[..20]);
buf[48..68].copy_from_slice(&self.peer_id.as_bytes()[..20]);
buf
}
@ -82,29 +70,27 @@ impl Handshake {
/// # Errors
///
/// Returns an error if the provided buffer is not long enough (at least 68 bytes).
pub fn from_buffer(buf: &Vec<u8>) -> Result<Self, ()> {
pub fn from_buffer(buf: &Vec<u8>) -> Option<Self> {
// Verify that buffer is at least the correct size, if not error
if buf.len() < 68 {
error!("buffer provided to handshake was too short");
return Err(());
return None;
}
let mut p_str = String::new();
for i in 1..20 {
p_str.push(buf[i] as char)
for byte in buf.iter().take(20).skip(1) {
p_str.push(*byte as char)
}
let mut info_hash: Vec<u8> = vec![0; 20];
for i in 28..48 {
info_hash[i - 28] = buf[i];
}
info_hash[..20].copy_from_slice(&buf[28..48]);
let mut peer_id = String::new();
for i in 48..68 {
peer_id.push(buf[i] as char)
for byte in buf.iter().take(68).skip(48) {
peer_id.push(*byte as char)
}
Ok(Self {
Some(Self {
p_str_len: buf[0],
p_str,
reserved: [0; 8],
@ -114,6 +100,6 @@ impl Handshake {
}
pub fn log_useful_information(&self) {
debug!("Connected - PeerId: {:?}", self.peer_id);
info!("Connected - PeerId: {:?}", self.peer_id);
}
}

2
src/main.rs
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@ -95,7 +95,7 @@ async fn main() {
let mut peer = match Peer::create_connection(&format!("{}:{}", announce_message_response.ips[0], announce_message_response.ports[0])).await {
None => { return },
Some(peer) => peer
};
};
let num_pieces = torrent.info.pieces.len() / 20;
peer.handshake(&torrent).await;

161
src/message.rs
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@ -1,5 +1,5 @@
use log::error;
use std::vec;
use log::error;
/// Represents a message in the BitTorrent protocol.
#[derive(Debug, PartialEq)]
@ -12,6 +12,14 @@ pub struct Message {
pub payload: Option<Vec<u8>>,
}
pub trait ToBuffer {
fn to_buffer(self) -> Vec<u8>;
}
pub trait FromBuffer {
fn from_buffer(buf: &[u8]) -> Self;
}
impl Message {
/// Creates a new message.
///
@ -23,7 +31,9 @@ impl Message {
pub fn new(message_length: u32, message_type: MessageType, payload: Option<Vec<u8>>) -> Self {
Self { message_length, message_type, payload }
}
}
impl FromBuffer for Message {
/// Decodes a message from a given buffer.
///
/// # Arguments
@ -33,11 +43,9 @@ impl Message {
/// # Returns
///
/// A new `Message` instance on success, or an empty `Result` indicating an error.
pub fn from_buffer(buf: &Vec<u8>) -> Result<Self, ()> {
fn from_buffer(buf: &[u8]) -> Self {
let mut message_length: [u8; 4] = [0; 4];
for i in 0..4 {
message_length[i] = buf[i];
};
message_length[..4].copy_from_slice(&buf[..4]);
let message_length = u32::from_be_bytes(message_length);
@ -47,44 +55,32 @@ impl Message {
if message_length == 0 {
message_type = MessageType::KeepAlive;
payload = None;
} else if message_length == 5 {
message_type = buf[4].into();
payload = None;
} else {
message_type = match buf[4] {
0 => MessageType::Choke,
1 => MessageType::Unchoke,
2 => MessageType::Interested,
3 => MessageType::NotInterested,
4 => MessageType::Have,
5 => MessageType::Bitfield,
6 => MessageType::Request,
7 => MessageType::Piece,
8 => MessageType::Cancel,
9 => MessageType::Port,
_ => {
error!("Invalid Message Type: {} | Message: {:?}", buf[4], buf);
return Err(())
}
};
// if message_type == MessageType::Piece && 5 + message_length - 1 != 16397 {
// error!("{:?}", 5..5 + message_length as usize - 1);
// }
message_type = buf[4].into();
payload = Some(buf[5..5 + message_length as usize - 1].to_vec());
let end_of_message = 4 + message_length as usize;
payload = Some(buf[5..end_of_message].to_vec());
}
Ok(Self {
Self {
message_length,
message_type,
payload
})
}
}
}
impl ToBuffer for Message {
/// Converts the `Message` instance to a byte buffer for sending.
///
/// # Returns
///
/// A byte vector containing the serialized message.
pub fn to_buffer(&mut self) -> Vec<u8> {
fn to_buffer(self) -> Vec<u8> {
let mut buf: Vec<u8> = vec![];
for byte in self.message_length.to_be_bytes() {
@ -95,54 +91,30 @@ impl Message {
MessageType::KeepAlive => {
return buf
},
MessageType::Choke => {
buf.push(0);
MessageType::Choke | MessageType::Unchoke | MessageType::Interested | MessageType::NotInterested => {
buf.push(self.message_type.into());
return buf;
},
MessageType::Unchoke => {
buf.push(1);
return buf;
MessageType::Have | MessageType::Bitfield | MessageType::Request | MessageType::Piece | MessageType::Cancel | MessageType::Port => {
buf.push(self.message_type.into());
},
MessageType::Interested => {
buf.push(2);
return buf;
},
MessageType::NotInterested => {
buf.push(3);
return buf;
},
MessageType::Have => {
buf.push(4);
},
MessageType::Bitfield => {
buf.push(5);
},
MessageType::Request => {
buf.push(6);
},
MessageType::Piece => {
buf.push(7);
},
MessageType::Cancel => {
buf.push(8);
},
MessageType::Port => {
buf.push(9);
},
}
match &self.payload {
None => { panic!("Error you are trying to create a message that needs a payload with no payload") }
Some(payload) => {
for byte in payload {
buf.push(*byte)
}
buf
MessageType::Error => {
panic!("Error making message into buffer")
}
}
}
match self.payload {
None => { panic!("Error you are trying to create a message that needs a payload with no payload") }
Some(payload) => {
buf.extend(payload);
}
}
buf
}
}
impl Message {
/// Create a request message from a given piece_index, offset, and length
///
/// # Arguments
@ -181,7 +153,7 @@ impl Message {
/// # Returns
///
/// A tuple containing a vector of message byte buffers and the number of messages.
pub fn number_of_messages(buf: &Vec<u8>) -> (Vec<Vec<u8>>, u32) {
pub fn number_of_messages(buf: &[u8]) -> (Vec<Vec<u8>>, u32) {
let mut message_num = 0;
let mut messages: Vec<Vec<u8>> = vec![];
@ -194,7 +166,7 @@ impl Message {
j = u32::from_be_bytes([buf[i], buf[i + 1], buf[i + 2], buf[i + 3]]) as usize + 4;
messages.push(buf[i..i+j].to_vec());
i = i+j;
i += j;
message_num += 1;
if buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 0 && buf[i + 3] == 0 {
@ -234,4 +206,47 @@ pub enum MessageType {
Cancel = 8,
/// Placeholder for unimplemented message type.
Port = 9,
Error
}
impl From<u8> for MessageType {
fn from(val: u8) -> MessageType {
match val {
0 => MessageType::Choke,
1 => MessageType::Unchoke,
2 => MessageType::Interested,
3 => MessageType::NotInterested,
4 => MessageType::Have,
5 => MessageType::Bitfield,
6 => MessageType::Request,
7 => MessageType::Piece,
8 => MessageType::Cancel,
9 => MessageType::Port,
_ => {
error!("Invalid Message Type: {}", val);
MessageType::Error
}
}
}
}
impl From<MessageType> for u8 {
fn from(val: MessageType) -> u8 {
match val {
MessageType::Choke => 0,
MessageType::Unchoke => 1,
MessageType::Interested => 2,
MessageType::NotInterested => 3,
MessageType::Have => 4,
MessageType::Bitfield => 5,
MessageType::Request => 6,
MessageType::Piece => 7,
MessageType::Cancel => 8,
MessageType::Port => 9,
_ => {
error!("Invalid Message Type: {:?}", val);
u8::MAX
}
}
}
}

59
src/peer.rs
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@ -3,7 +3,7 @@
// Crate Imports
use crate::{
handshake::Handshake,
message::{ Message, MessageType },
message::{ FromBuffer, Message, MessageType, ToBuffer },
torrent::Torrent
};
@ -69,7 +69,7 @@ impl Peer {
pub async fn handshake(&mut self, torrent: &Torrent) {
let mut buf = vec![0; 1024];
let handshake_message = Handshake::new(torrent.get_info_hash()).unwrap();
let handshake_message = Handshake::new(&torrent.get_info_hash()).unwrap();
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&handshake_message.to_buffer()).await.unwrap();
@ -80,21 +80,11 @@ impl Peer {
let handshake = Handshake::from_buffer(&buf[..68].to_vec()).unwrap();
handshake.log_useful_information();
for message_buf in Message::number_of_messages(&buf[68..].to_vec()).0 {
let message = match Message::from_buffer(&message_buf) {
Err(()) => {
error!("error decoding message");
self.disconnect().await;
return;
},
Ok(message) => { message }
};
for message_buf in Message::number_of_messages(&buf[68..]).0 {
let message = Message::from_buffer(&message_buf);
match message.message_type {
MessageType::Unchoke => {
self.choking = false;
}
_ => {}
if message.message_type == MessageType::Unchoke {
self.choking = false;
}
}
@ -104,10 +94,7 @@ impl Peer {
/// Keeps the connection alive and sends interested messages until the peer unchokes
pub async fn keep_alive_until_unchoke(&mut self) {
loop {
let message = match self.read_message().await {
None => return,
Some(message) => message
};
let message = self.read_message().await;
debug!("{message:?}");
match message.message_type {
@ -128,7 +115,7 @@ impl Peer {
}
/// Sends a message to the peer and waits for a response, which it returns
pub async fn send_message(&mut self, mut message: Message) -> Message {
pub async fn send_message(&mut self, message: Message) -> Message {
let mut buf = vec![0; 16_397];
self.connection_stream.writable().await.unwrap();
@ -137,11 +124,11 @@ impl Peer {
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read_exact(&mut buf).await.unwrap();
Message::from_buffer(&buf).unwrap()
Message::from_buffer(&buf)
}
/// Sends a message to the peer and waits for a response, which it returns
pub async fn send_message_exact_size_response(&mut self, mut message: Message, size: usize) -> Message {
pub async fn send_message_exact_size_response(&mut self, message: Message, size: usize) -> Message {
let mut buf = vec![0; size];
self.connection_stream.writable().await.unwrap();
@ -150,32 +137,23 @@ impl Peer {
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read_exact(&mut buf).await.unwrap();
Message::from_buffer(&buf).unwrap()
Message::from_buffer(&buf)
}
/// Sends a message but doesn't wait for a response
pub async fn send_message_no_response(&mut self, mut message: Message) {
pub async fn send_message_no_response(&mut self, message: Message) {
self.connection_stream.writable().await.unwrap();
self.connection_stream.write_all(&message.to_buffer()).await.unwrap();
}
/// reads a message from the peer
pub async fn read_message(&mut self) -> Option<Message> {
pub async fn read_message(&mut self) -> Message {
let mut buf = vec![0; 16_397];
self.connection_stream.readable().await.unwrap();
let _ = self.connection_stream.read(&mut buf).await.unwrap();
match Message::from_buffer(&buf) {
Err(()) => {
error!("Unable to decode message");
self.disconnect().await;
return None;
},
Ok(message) => {
Some(message)
}
}
Message::from_buffer(&buf)
}
/// Shutsdown the connection stream
@ -197,8 +175,7 @@ impl Peer {
pub async fn request_piece(&mut self, index: u32, piece_length: u32, len: &mut u32, total_len: u32) -> Vec<u8> {
let mut buf = vec![];
// Sequentially requests piece from the peer
for offset in (0..piece_length).step_by(16_384 as usize) {
for offset in (0..piece_length).step_by(16_384) {
let mut length = 16_384;
let response: Message;
@ -217,12 +194,12 @@ impl Peer {
match response.message_type {
MessageType::Piece => {
let data = response.payload.unwrap();
let mut data = response.payload.unwrap();
*len += data.len() as u32;
*len -= 8;
for i in 8..data.len() {
buf.push(data[i])
for byte in data.drain(..).skip(8) {
buf.push(byte)
}
},
_ => { debug!("didn't recieve expected piece request | Recieved: {:?}", response.message_type); }

7
src/torrent.rs
View File

@ -107,7 +107,6 @@ impl Torrent {
match &self.info.files {
None => {
info!("> {}", self.info.name);
return
}
Some(files) => {
for file in files {
@ -142,9 +141,9 @@ impl Torrent {
/// # Returns
///
/// * `true` if the piece is correct, `false` otherwise.
pub fn check_piece(&self, piece: &Vec<u8>, index: u32) -> bool {
pub fn check_piece(&self, piece: &[u8], index: u32) -> bool {
let mut hasher = Sha1::new();
hasher.update(&piece);
hasher.update(piece);
let result = hasher.finalize();
let piece_hash = &self.info.pieces[(index * 20) as usize..(index * 20 + 20) as usize];
@ -197,7 +196,7 @@ impl Torrent {
}
}
for (i, url) in self.announce_list.as_ref().unwrap().into_iter().enumerate() {
for (i, url) in self.announce_list.as_ref().unwrap().iter().enumerate() {
debug!("{:?}", url);
if let Some(captures) = re.captures(&url[i]) {
let hostname = captures.get(1).unwrap().as_str();

52
src/tracker.rs
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@ -94,7 +94,7 @@ pub trait ToBuffer {
/// A trait for converting a type from a byte buffer.
pub trait FromBuffer {
/// Converts a byte buffer into the implementing type.
fn from_buffer(buf: &Vec<u8>) -> Self;
fn from_buffer(buf: &[u8]) -> Self;
}
#[derive(Debug)]
@ -129,23 +129,17 @@ impl ToBuffer for ConnectionMessage {
}
impl FromBuffer for ConnectionMessage {
fn from_buffer(buf: &Vec<u8>) -> Self {
fn from_buffer(buf: &[u8]) -> Self {
let mut action: [u8; 4] = [0; 4];
for i in 0..4 {
action[i] = buf[i];
}
action[..4].copy_from_slice(&buf[..4]);
let action = i32::from_be_bytes(action);
let mut transaction_id: [u8; 4] = [0; 4];
for i in 4..8 {
transaction_id[i - 4] = buf[i];
}
transaction_id[..4].copy_from_slice(&buf[4..8]);
let transaction_id = i32::from_be_bytes(transaction_id);
let mut connection_id: [u8; 8] = [0; 8];
for i in 8..16 {
connection_id[i - 8] = buf[i];
}
connection_id[..4].copy_from_slice(&buf[8..16]);
let connection_id = i64::from_be_bytes(connection_id);
@ -179,15 +173,13 @@ pub struct AnnounceMessage {
impl AnnounceMessage {
/// Creates a new announce message.
pub fn new(connection_id: i64, infohash: &Vec<u8>, peerid: &str, total_length: i64) -> Self {
let mut info_hash: [u8; 20] = [0; 20];
for i in 0..20 {
info_hash[i] = infohash[i];
}
pub fn new(connection_id: i64, infohash: &[u8], peerid: &str, total_length: i64) -> Self {
let mut info_hash: [u8; 20] = [ 0; 20 ];
info_hash[..20].copy_from_slice(&infohash[..20]);
let mut peer_id: [u8; 20] = [0; 20];
for i in 0..20 {
peer_id[i] = peerid.chars().nth(i).unwrap() as u8;
for (i, character) in peerid.chars().enumerate() {
peer_id[i] = character as u8;
}
Self {
@ -246,35 +238,25 @@ pub struct AnnounceMessageResponse {
impl FromBuffer for AnnounceMessageResponse {
/// Converts a byte buffer into an `AnnounceMessageResponse` instance.
fn from_buffer(buf: &Vec<u8>) -> Self {
fn from_buffer(buf: &[u8]) -> Self {
let mut action: [u8; 4] = [0; 4];
for i in 0..4 {
action[i] = buf[i];
}
action[..4].copy_from_slice(&buf[0..4]);
let action = i32::from_be_bytes(action);
let mut transaction_id: [u8; 4] = [0; 4];
for i in 4..8 {
transaction_id[i - 4] = buf[i];
}
let mut transaction_id: [u8; 4] = [ 0; 4 ];
transaction_id[..4].copy_from_slice(&buf[4..8]);
let transaction_id = i32::from_be_bytes(transaction_id);
let mut interval: [u8; 4] = [0; 4];
for i in 8..12 {
interval[i - 8] = buf[i];
}
interval[..4].copy_from_slice(&buf[8..12]);
let interval = i32::from_be_bytes(interval);
let mut leechers: [u8; 4] = [0; 4];
for i in 12..16 {
leechers[i - 12] = buf[i];
}
leechers[..4].copy_from_slice(&buf[12..16]);
let leechers = i32::from_be_bytes(leechers);
let mut seeders: [u8; 4] = [0; 4];
for i in 16..20 {
seeders[i - 16] = buf[i];
}
seeders[..4].copy_from_slice(&buf[16..20]);
let seeders = i32::from_be_bytes(seeders);
let mut ips: Vec<Ipv4Addr> = vec![];