diff --git a/Cargo.lock b/Cargo.lock index e5653f207c..58ab40b76e 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -240,11 +240,88 @@ name = "fuchsia-zircon-sys" version = "0.3.3" source = "registry+https://github.com/rust-lang/crates.io-index" +[[package]] +name = "futures" +version = "0.3.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "futures-channel 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", + "futures-core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", + "futures-executor 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", + "futures-io 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", + "futures-sink 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", + "futures-task 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", + "futures-util 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)", +] + +[[package]] +name = "futures-channel" +version = 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"053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe" "checksum rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3ae1b169243eaf61759b8475a998f0a385e42042370f3a7dbaf35246eacc8412" @@ -814,9 +931,9 @@ dependencies = [ "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a" "checksum subtle 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2d67a5a62ba6e01cb2192ff309324cb4875d0c451d55fe2319433abe7a05a8ee" "checksum subtle 2.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7c65d530b10ccaeac294f349038a597e435b18fb456aadd0840a623f83b9e941" -"checksum syn 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)" = "f89693ae015201f8de93fd96bde2d065f8bfc3f97ce006d5bc9f900b97c0c7c0" +"checksum syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)" = "dff0acdb207ae2fe6d5976617f887eb1e35a2ba52c13c7234c790960cdad9238" "checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060" -"checksum tokio 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "beeef686ef92a222de07e089f455d9f8478bbba9651718f9e4b276babe829082" +"checksum tokio 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "bcced6bb623d4bff3739c176c415f13c418f426395c169c9c3cd9a492c715b16" "checksum tokio-macros 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d5795a71419535c6dcecc9b6ca95bdd3c2d6142f7e8343d7beb9923f129aa87e" "checksum typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6d2783fe2d6b8c1101136184eb41be8b1ad379e4657050b8aaff0c79ee7575f9" "checksum unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479" diff --git a/Cargo.toml b/Cargo.toml index ccc83dffa5..b62645736e 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -7,7 +7,10 @@ edition = "2018" # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html [dependencies] -sphinx = { path = "../sphinx" } -tokio = { version = "0.2", features = ["full"] } +clap = "2.33.0" curve25519-dalek = "1.2.3" -clap = "2.33.0" \ No newline at end of file +hex = "0.4.0" +futures = "0.3.1" +rand = "0.7.2" +sphinx = { path = "../sphinx" } +tokio = { version = "0.2.4", features = ["full"] } \ No newline at end of file diff --git a/src/main.rs b/src/main.rs index 07204e08d5..e89641e0b2 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,6 +1,8 @@ +use crate::provider::ServiceProvider; use clap::{App, Arg, ArgMatches, SubCommand}; use curve25519_dalek::scalar::Scalar; use std::net::ToSocketAddrs; +use std::path::PathBuf; use std::process; mod provider; @@ -33,9 +35,12 @@ fn run(matches: &ArgMatches) { } }; + let store_dir = PathBuf::from(matches.value_of("storeDir").unwrap()); + println!("The value of host is: {:?}", host); println!("The value of port is: {:?}", port); println!("The value of key is: {:?}", secret_key); + println!("The value of storeDir is: {:?}", store_dir); let socket_address = (host, port) .to_socket_addrs() @@ -48,7 +53,8 @@ fn run(matches: &ArgMatches) { // make sure our socket_address is equal to our predefined-hardcoded value assert_eq!("127.0.0.1:8081", socket_address.to_string()); - provider::listening_loop().unwrap(); + let provider = ServiceProvider::new(socket_address, secret_key, store_dir); + provider.start_listening().unwrap() } fn main() { @@ -58,7 +64,7 @@ fn main() { .about("Implementation of the Loopix-based Service Provider") .subcommand( SubCommand::with_name("run") - .about("Starts the mixnode") + .about("Starts the service provider") .arg( Arg::with_name("host") .short("h") @@ -80,6 +86,14 @@ fn main() { .long("keyfile") .help("Optional path to the persistent keyfile of the node") .takes_value(true), + ) + .arg( + Arg::with_name("storeDir") + .short("sdir") + .long("storeDir") + .help("Directory storing all packets for the clients") + .takes_value(true) + .required(true), ), ) .get_matches(); diff --git a/src/provider/mod.rs b/src/provider/mod.rs index 3be833af96..fcc5ba3c69 100644 --- a/src/provider/mod.rs +++ b/src/provider/mod.rs @@ -1,47 +1,205 @@ +use std::fs::File; +use std::io::Write; +use std::net::SocketAddr; +use std::path::{Path, PathBuf}; +use std::sync::Arc; +use std::sync::RwLock; + +use curve25519_dalek::scalar::Scalar; +use rand::Rng; use sphinx::{ProcessedPacket, SphinxPacket}; +use sphinx::route::{DestinationAddressBytes, SURBIdentifier}; use tokio::prelude::*; use tokio::runtime::Runtime; -pub fn listening_loop() -> Result<(), Box> { - // Create the runtime, probably later move it to Provider struct itself? - let mut rt = Runtime::new()?; +// TODO: if we ever create config file, this should go there +const STORED_MESSAGE_FILENAME_LENGTH: usize = 16; - // Spawn the root task - rt.block_on(async { - let my_address = "127.0.0.1:8081"; - let mut listener = tokio::net::TcpListener::bind(my_address).await?; - println!("Starting Nym store-and-forward Provider on address {:?}", my_address); - println!("Waiting for input..."); +// TODO: this will probably need to be moved elsewhere I imagine +// DUPLICATE WITH MIXNODE CODE!!! +#[derive(Debug)] +pub enum MixProcessingError { + SphinxRecoveryError, + ReceivedForwardHopError, + InvalidPayload, + NonMatchingRecipient, + FileIOFailure, +} +impl From for MixProcessingError { + // for time being just have a single error instance for all possible results of sphinx::ProcessingError + fn from(_: sphinx::ProcessingError) -> Self { + use MixProcessingError::*; + + SphinxRecoveryError + } +} + +impl From for MixProcessingError { + fn from(_: std::io::Error) -> Self { + use MixProcessingError::*; + + FileIOFailure + } +} + + +// ProcessingData defines all data required to correctly unwrap sphinx packets +// Do note that we're copying this struct around and hence the secret_key. +// It might, or might not be, what we want +#[derive(Debug, Clone)] +struct ProcessingData { + secret_key: Scalar, + store_dir: PathBuf, +} + +impl ProcessingData { + fn new(secret_key: Scalar, store_dir: PathBuf) -> Self { + ProcessingData { + secret_key, + store_dir, + } + } + + fn add_arc_rwlock(self) -> Arc> { + Arc::new(RwLock::new(self)) + } +} + +struct StoreData { + client_address: DestinationAddressBytes, + client_surb_id: SURBIdentifier, + message: Vec, +} + + +struct PacketProcessor(()); + +impl PacketProcessor { + fn process_sphinx_data_packet(packet_data: &[u8], processing_data: &RwLock) -> Result { + let packet = SphinxPacket::from_bytes(packet_data.to_vec())?; + let read_processing_data = processing_data.read().unwrap(); + let (client_address, client_surb_id, payload) = match packet.process(read_processing_data.secret_key) { + ProcessedPacket::ProcessedPacketFinalHop(client_address, surb_id, payload) => (client_address, surb_id, payload), + _ => return Err(MixProcessingError::ReceivedForwardHopError), + }; + + let (payload_destination, message) = payload.try_recover_destination_and_plaintext().ok_or_else(|| MixProcessingError::InvalidPayload)?; + if client_address != payload_destination { + return Err(MixProcessingError::NonMatchingRecipient); + } + + Ok(StoreData { + client_address, + client_surb_id, + message, + }) + } + + fn generate_random_file_name() -> String { + rand::thread_rng().sample_iter(&rand::distributions::Alphanumeric).take(STORED_MESSAGE_FILENAME_LENGTH).collect::() + } + + fn store_processed_data(store_data: StoreData, store_dir: &Path) -> Result<(), MixProcessingError> { + let client_dir_name = hex::encode(store_data.client_address); + let full_store_dir = store_dir.join(client_dir_name); + let full_store_path = full_store_dir.join(PacketProcessor::generate_random_file_name()); + println!("going to store: {:?} in file: {:?}", store_data.message, full_store_path); + + // TODO: what to do with surbIDs?? + + // we can use normal io here, no need for tokio as it's all happening in one thread per connection + std::fs::create_dir_all(full_store_dir)?; + let mut file = File::create(full_store_path)?; + file.write_all(store_data.message.as_ref())?; + + + Ok(()) + } +} + + +pub struct ServiceProvider { + network_address: SocketAddr, + secret_key: Scalar, + store_dir: PathBuf, +} + +impl ServiceProvider { + pub fn new(network_address: SocketAddr, secret_key: Scalar, store_dir: PathBuf) -> Self { + ServiceProvider { + network_address, + secret_key, + store_dir, + } + } + + + async fn process_socket_connection(mut socket: tokio::net::TcpStream, processing_data: Arc>) { + // TODO: we will actually need to distinguish multiple types of requests here; + // either from mixnodes to store final hop information + // or from clients to pull messages + + let mut buf = [0u8; sphinx::PACKET_SIZE]; + + // In a loop, read data from the socket and write the data back. loop { - let (mut inbound, _) = listener.accept().await?; - - tokio::spawn(async move { - let mut buf = [0; sphinx::PACKET_SIZE]; - - loop { - match inbound.read(&mut buf).await { - Ok(length) if length == 0 => - { - println!("Remote connection closed."); - return; - } - Ok(_) => { - let packet = SphinxPacket::from_bytes(buf.to_vec()).unwrap(); - let payload = match packet.process(Default::default()) { - ProcessedPacket::ProcessedPacketFinalHop(_, _, payload) => Some(payload), - _ => None, - }.unwrap(); - let message = payload.get_content(); - } + match socket.read(&mut buf).await { + // socket closed + Ok(n) if n == 0 => { + println!("Remote connection closed."); + return; + } + Ok(_) => { + let store_data = match PacketProcessor::process_sphinx_data_packet(buf.as_ref(), processing_data.as_ref()) { + Ok(sd) => sd, Err(e) => { - println!("failed to read from socket; err = {:?}", e); + eprintln!("failed to process sphinx packet; err = {:?}", e); return; } }; + PacketProcessor::store_processed_data(store_data, processing_data.read().unwrap().store_dir.as_path()).unwrap_or_else(|e| { + eprintln!("failed to store processed sphinx message; err = {:?}", e) + }); } - }); + Err(e) => { + eprintln!("failed to read from socket; err = {:?}", e); + return; + } + }; + + // Write the some data back + if let Err(e) = socket.write_all(b"foomp").await { + eprintln!("failed to write reply to socket; err = {:?}", e); + return; + } } - }) + } + + + pub fn start_listening(&self) -> Result<(), Box> { + // Create the runtime, probably later move it to Provider struct itself? + // TODO: figure out the difference between Runtime and Handle + let mut rt = Runtime::new()?; +// let mut h = rt.handle(); + + // Spawn the root task + rt.block_on(async { + let mut listener = tokio::net::TcpListener::bind(self.network_address).await?; + let processing_data = ProcessingData::new(self.secret_key, self.store_dir.clone()).add_arc_rwlock(); + + loop { + let (socket, _) = listener.accept().await?; + let thread_processing_data = processing_data.clone(); + tokio::spawn(async move { + ServiceProvider::process_socket_connection(socket, thread_processing_data).await + }); + } + }) + } } + + + +