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feat: init

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Yujia Qiao 2021-12-11 20:30:42 +08:00
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[package]
name = "rathole"
version = "0.1.0"
edition = "2021"
authors = ["Yujia Qiao <code@rapiz.me>"]
description = "A reverse proxy for NAT traversal"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[profile.bench]
debug = 1
[dependencies]
tokio = { version = "1", features = ["full"] }
bytes = { version = "1"}
clap = "3.0.0-beta.5"
toml = "0.5"
serde = {version = "1.0", features = ["derive"]}
anyhow = "1.0"
ring = "0.16"
bincode = "1"
lazy_static = "1.4.0"
hex = "0.4"
rand = "0.8.0"
backoff = {version="0.3.0", features=["tokio"]}
tracing = "0.1"
tracing-subscriber = "0.2"
socket2 = "0.4"
fdlimit = "0.2.1"

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# rathole
![rathole-logo](./doc/img/rathole-logo.png)
A fast and stable reverse proxy for NAT traversal, written in Rust
rathole, like frp, can help to expose the service on the device behind the NAT to the Internet, via a server with a public IP.
## Quickstart
To use rathole, you need a server with a public IP, and a device behind the NAT, where some services that need to be exposed to the Internet.
Assuming you have a NAS at home behind the NAT, and want to expose its ssh service to the Internet:
1. On the server which has a public IP
Create `server.toml` with the following content and accommodate it to your needs.
```toml
# server.toml
[server]
bind_addr = "0.0.0.0:2333" # `2333` specifys the port that rathole listens for clients
[server.services.my_nas_ssh]
token = "use_a_secret_that_only_you_know" # Token that is used to authenticate the client for the service. Change to a arbitrary value.
bind_addr = "0.0.0.0:5202" # `5202` specifys the port that exposes `my_nas_ssh` to the Internet
```
Then run:
```bash
./rathole server.toml
```
2. On the host which is behind the NAT (your NAS)
Create `client.toml` with the following content and accommodate it to your needs.
```toml
[client]
remote_addr = "myserver.com:2333" # The address of the server. The port must be the same with the port in `server.bind_addr`
[client.services.my_nas_ssh]
token = "use_a_secret_that_only_you_know" # Must be the same with the server to pass the validataion
local_addr = "127.0.0.1:22" # The address of the service that needs to be forwarded
```
Then run:
```bash
./rathole client.toml
```
3. Now the client will try to connect to the server `myserver.com` on port `2333`, and any traffic to `myserver.com:5202` will be forwarded to the client's port `22`.
So you can `ssh myserver.com:5202` to ssh to your NAS.
## Configuration
`rathole` can automatically determine to run in the server mode or the client mode, according to the content of the configuration file, if only one of `[server]` and `[client]` block is present, like the example in [Quickstart](#Quickstart).
But the `[client]` and `[server]` block can also be put in one file. Then on the server side, run `rathole --server config.toml` and on the client side, run `rathole --client config.toml` to explictly tell `rathole` the running mode.
Here is the full configuration specification:
```toml
[client]
remote_addr = "example.com:2333" # Necessary. The address of the server
default_token = "default_token_if_not_specify" # Optional. The default token of services, if they don't define their own ones
[client.services.service1] # A service that needs forwarding. The name `service1` can change arbitrarily, as long as identical to the name in the server's configuration
token = "whatever" # Necessary if `client.default_token` not set
local_addr = "127.0.0.1:1081" # Necessary. The address of the service that needs to be forwarded
[client.services.service2] # Multiple services can be defined
local_addr = "127.0.0.1:1082"
[server]
bind_addr = "0.0.0.0:2333" # Necessary. The address that the server listens for clients. Generally only the port needs to be change.
default_token = "default_token_if_not_specify" # Optional
[server.services.service1] # The service name must be identical to the client side
token = "whatever" # Necesary if `server.default_token` not set
bind_addr = "0.0.0.0:8081" # Necessary. The address of the service is exposed at. Generally only the port needs to be change.
[server.services.service2]
bind_addr = "0.0.0.1:8082"
```
# Benchmark
rathole has similiar latency to frp, but can handle more connections. Also it can provide much better bandwidth than frp.
See also [Benchmark](./doc/benchmark.md).
![tcp_bitrate](./doc/img/tcp_bitrate.svg)
![tcp_latency](./doc/img/tcp_latency.svg)
# Development
`rathole` is in active development. A load of features is on the way:
- [ ] UDP support
- [ ] TLS transport
- [ ] Hot reloading
- [ ] HTTP APIs for configuration

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# Benchmark
> Date: 2021/12/14
>
> Arch Linux with 5.15.7-arch1-1 kernel
>
> Intel i7-6600U CPU @ 2.60GHz
>
> 20GB RAM
## Bitrate
![tcp_bitrate](./img/tcp_bitrate.svg)
rathole with the following configuration:
```toml
[client]
remote_addr = "localhost:2333"
default_token = "123"
[client.services.foo1]
local_addr = "127.0.0.1:80"
[server]
bind_addr = "0.0.0.0:2333"
default_token = "123"
[server.services.foo1]
bind_addr = "0.0.0.0:5202"
```
frp 0.38.0 with the following configuration:
```ini
[common]
bind_port = 7000
authentication_method = token
token = 1233
```
```ini
# frpc.ini
[common]
server_addr = 127.0.0.1
#server_addr = 47.100.208.60
server_port = 7000
authentication_method = token
token = 1233
[ssh]
type = tcp
local_ip = 127.0.0.1
local_port = 80
remote_port = 5203
```
```
$ iperf3 -v
iperf 3.10.1 (cJSON 1.7.13)
Linux sig 5.15.7-arch1-1 #1 SMP PREEMPT Wed, 08 Dec 2021 14:33:16 +0000 x86_64
Optional features available: CPU affinity setting, IPv6 flow label, TCP congestion algorithm setting, sendfile / zerocopy, socket pacing, authentication, bind to device, support IPv4 don't fragment
$ sudo iperf3 -s -p 80
```
For rathole benchmark:
```
$ iperf3 -c 127.0.0.1 -p 5202
```
For frp benchmark:
```
$ iperf3 -c 127.0.0.1 -p 5203
```
## Latency
nginx/1.20.2 listens on port 80, with the default test page.
frp and rathole configuration is same with the previous section.
Using [ali](https://github.com/nakabonne/ali) with different rate.
e.g. for rathole 10 QPS benchmark:
```
ali -r 10 http://127.0.0.1:5202
```
![tcp_latency](./img/tcp_latency.svg)

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# Internals
![overview](./img/overview.png)
## Conceptions
### Service
The entity whose traffic needs to be forwarded
### Server
The host that runs `rathole` in the server mode
### Client
The host behind the NAT that runs `rathole` in the client mode. It has some services that need to be forwarded.
### Visitor
Who visists a *service*, via the *server*
### Control Channel
A control channel is a TCP connection between the *server* and the *client* that only carries `rathole` control commands for one *service*.
### Data Channel
A data channel is a TCP connection between the *server* and the *client* that only carries the encapsulated data that needs forwarding for one *service*.
## The Process
*TODO: Add more details about the protocol*
When `rathole` starts in the client mode, it creates connections to `server.common.bind_addr` for each service. These connection acts as control channels.
When a control channel starts, the server challenge the client by a nonce, the client is required to authenticate as the service it wants to represent. Then the forwarding of that service is set up.
When the server accepts a connection on a service's `bind_port`, it sends a control command to the client via the corresponding contorl channel. Then the client connects to the server to create a data channel. In this way, a forwarding is set up. The server also creates a few data channels in advance to improve the latency.

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# Out of Scope
- *domain based forwarding for HTTP*
Use nginx to do this.
- *frp's STCP*
You may want to consider secure tunnels like wireguard or zerotier.

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[client]
remote_addr = "localhost:2333"
default_token = "123"
[client.services.foo1]
local_addr = "127.0.0.1:80"

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[server]
bind_addr = "0.0.0.0:2333"
default_token = "123"
[server.services.foo1]
bind_addr = "0.0.0.0:5202"

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use clap::{AppSettings, Parser};
#[derive(Parser, Debug)]
#[clap(about, version, setting(AppSettings::DeriveDisplayOrder))]
pub struct Cli {
/// The path to the configuration file
///
/// Running as a client or a server is automatically determined
/// according to the configuration file.
#[clap(parse(from_os_str), name = "config")]
pub config_path: std::path::PathBuf,
/// Run as a server
#[clap(long, short)]
pub server: bool,
/// Run as a client
#[clap(long, short)]
pub client: bool,
}

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use std::collections::HashMap;
use std::sync::Arc;
use crate::config::{ClientConfig, ClientServiceConfig, Config};
use crate::protocol::{
self, read_hello, DataChannelCmd,
Hello::{self, *},
CURRENT_PROTO_VRESION, HASH_WIDTH_IN_BYTES,
};
use crate::protocol::{read_data_cmd, Ack, Auth, ControlChannelCmd};
use anyhow::{anyhow, bail, Context, Result};
use backoff::ExponentialBackoff;
use tokio::io;
use tokio::sync::oneshot;
use tokio::time::{self, Duration};
use tokio::{self, io::AsyncWriteExt, net::TcpStream};
use tracing::{debug, error, info, instrument, Instrument, Span};
pub async fn run_client(config: &Config) -> Result<()> {
let mut client = Client::from(config)?;
client.run().await
}
type ServiceDigest = protocol::Digest;
type Nonce = protocol::Digest;
struct Client<'a> {
config: &'a ClientConfig,
service_handles: HashMap<String, ControlChannelHandle>,
}
impl<'a> Client<'a> {
fn from(config: &'a Config) -> Result<Client> {
if let Some(config) = &config.client {
Ok(Client {
config,
service_handles: HashMap::new(),
})
} else {
Err(anyhow!("Try to run as a client, but the configuration is missing. Please add the `[client]` block"))
}
}
async fn run(&mut self) -> Result<()> {
for (name, config) in &self.config.services {
let handle =
ControlChannelHandle::new((*config).clone(), self.config.remote_addr.clone());
self.service_handles.insert(name.clone(), handle);
}
loop {
tokio::select! {
val = tokio::signal::ctrl_c() => {
match val {
Ok(()) => {}
Err(err) => {
error!("Unable to listen for shutdown signal: {}", err);
}
}
break;
},
}
}
// Shutdown all services
for (_, handle) in self.service_handles.drain() {
handle.shutdown();
}
Ok(())
}
}
struct RunDataChannelArgs {
session_key: Nonce,
remote_addr: String,
local_addr: String,
}
async fn run_data_channel(args: Arc<RunDataChannelArgs>) -> Result<()> {
// Retry at least every 100ms, at most for 10 seconds
let backoff = ExponentialBackoff {
max_interval: Duration::from_millis(100),
max_elapsed_time: Some(Duration::from_secs(10)),
..Default::default()
};
// Connect to remote_addr
let mut conn = backoff::future::retry(backoff, || async {
Ok(TcpStream::connect(&args.remote_addr)
.await
.with_context(|| "Failed to connect to remote_addr")?)
})
.await?;
// Send nonce
let v: &[u8; HASH_WIDTH_IN_BYTES] = args.session_key[..].try_into().unwrap();
let hello = Hello::DataChannelHello(CURRENT_PROTO_VRESION, v.to_owned());
conn.write_all(&bincode::serialize(&hello).unwrap()).await?;
// Forward
match read_data_cmd(&mut conn).await? {
DataChannelCmd::StartForward => {
let mut local = TcpStream::connect(&args.local_addr)
.await
.with_context(|| "Failed to conenct to local_addr")?;
let _ = io::copy_bidirectional(&mut conn, &mut local).await;
}
}
Ok(())
}
struct ControlChannel {
digest: ServiceDigest,
service: ClientServiceConfig,
shutdown_rx: oneshot::Receiver<u8>,
remote_addr: String,
}
struct ControlChannelHandle {
shutdown_tx: oneshot::Sender<u8>,
}
impl ControlChannel {
#[instrument(skip(self), fields(service=%self.service.name))]
async fn run(&mut self) -> Result<()> {
let mut conn = TcpStream::connect(&self.remote_addr)
.await
.with_context(|| format!("Failed to connect to the server: {}", &self.remote_addr))?;
// Send hello
let hello_send =
Hello::ControlChannelHello(CURRENT_PROTO_VRESION, self.digest[..].try_into().unwrap());
conn.write_all(&bincode::serialize(&hello_send).unwrap())
.await?;
// Read hello
let nonce = match read_hello(&mut conn)
.await
.with_context(|| "Failed to read hello from the server")?
{
ControlChannelHello(_, d) => d,
_ => {
bail!("Unexpected type of hello");
}
};
// Send auth
let mut concat = Vec::from(self.service.token.as_ref().unwrap().as_bytes());
concat.extend_from_slice(&nonce);
let session_key = protocol::digest(&concat);
let auth = Auth(session_key);
conn.write_all(&bincode::serialize(&auth).unwrap()).await?;
// Read ack
match protocol::read_ack(&mut conn).await? {
Ack::Ok => {}
v => {
return Err(anyhow!("{}", v))
.with_context(|| format!("Authentication failed: {}", self.service.name));
}
}
// Channel ready
info!("Control channel established");
let remote_addr = self.remote_addr.clone();
let local_addr = self.service.local_addr.clone();
let data_ch_args = Arc::new(RunDataChannelArgs {
session_key,
remote_addr,
local_addr,
});
loop {
tokio::select! {
val = protocol::read_control_cmd(&mut conn) => {
let val = val?;
debug!( "Received {:?}", val);
match val {
ControlChannelCmd::CreateDataChannel => {
let args = data_ch_args.clone();
tokio::spawn(async move {
if let Err(e) = run_data_channel(args).await.with_context(|| "Failed to run the data channel") {
error!("{:?}", e);
}
}.instrument(Span::current()));
}
}
},
_ = &mut self.shutdown_rx => {
info!( "Shutting down gracefully...");
break;
}
}
}
Ok(())
}
}
impl ControlChannelHandle {
#[instrument(skip_all, fields(service = %service.name))]
fn new(service: ClientServiceConfig, remote_addr: String) -> ControlChannelHandle {
let digest = protocol::digest(service.name.as_bytes());
let (shutdown_tx, shutdown_rx) = oneshot::channel();
let mut s = ControlChannel {
digest,
service,
shutdown_rx,
remote_addr,
};
tokio::spawn(
async move {
loop {
if let Err(err) = s
.run()
.await
.with_context(|| "Failed to run the control channel")
{
let duration = Duration::from_secs(2);
error!("{:?}\n\nRetry in {:?}...", err, duration);
time::sleep(duration).await;
} else {
// Shutdown
break;
}
}
}
.instrument(Span::current()),
);
ControlChannelHandle { shutdown_tx }
}
fn shutdown(self) {
// A send failure shows that the actor has already shutdown.
let _ = self.shutdown_tx.send(0u8);
}
}

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use anyhow::{anyhow, bail, Context, Result};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::path::PathBuf;
use tokio::fs;
use toml;
#[derive(Debug, Serialize, Deserialize, Copy, Clone)]
pub enum Encryption {
#[serde(rename = "none")]
None,
#[serde(rename = "aes")]
Aes,
}
fn default_encryption() -> Encryption {
Encryption::None
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ClientServiceConfig {
#[serde(skip)]
pub name: String,
pub local_addr: String,
pub token: Option<String>,
#[serde(default = "default_encryption")]
pub encryption: Encryption,
}
#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct ServerServiceConfig {
#[serde(skip)]
pub name: String,
pub bind_addr: String,
pub token: Option<String>,
#[serde(default = "default_encryption")]
pub encryption: Encryption,
}
#[derive(Debug, Serialize, Deserialize, Default)]
pub struct ClientConfig {
pub remote_addr: String,
pub default_token: Option<String>,
pub services: HashMap<String, ClientServiceConfig>,
}
#[derive(Debug, Serialize, Deserialize, Default)]
pub struct ServerConfig {
pub bind_addr: String,
pub default_token: Option<String>,
pub services: HashMap<String, ServerServiceConfig>,
}
#[derive(Debug, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Config {
pub server: Option<ServerConfig>,
pub client: Option<ClientConfig>,
}
impl Config {
fn from_str(s: &str) -> Result<Config> {
let mut config: Config =
toml::from_str(&s).with_context(|| "Failed to parse the config")?;
if let Some(server) = config.server.as_mut() {
for (name, s) in &mut server.services {
s.name = name.clone();
if s.token.is_none() {
s.token = server.default_token.clone();
if s.token.is_none() {
bail!("The token of service {} is not set", name);
}
}
}
}
if let Some(client) = config.client.as_mut() {
for (name, s) in &mut client.services {
s.name = name.clone();
if s.token.is_none() {
s.token = client.default_token.clone();
if s.token.is_none() {
bail!("The token of service {} is not set", name);
}
}
}
}
if config.server.is_none() && config.client.is_none() {
Err(anyhow!("Neither of `[server]` or `[client]` is defined"))
} else {
Ok(config)
}
}
pub async fn from_file(path: &PathBuf) -> Result<Config> {
let s: String = fs::read_to_string(path)
.await
.with_context(|| format!("Failed to read the config {:?}", path))?;
Config::from_str(&s).with_context(|| {
"Configuration is invalid. Please refer to the configuration specification."
})
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::fs;
use anyhow::Result;
#[test]
fn test_mimic_client_config() -> Result<()> {
let s = fs::read_to_string("./example/mimic/client.toml").unwrap();
Config::from_str(&s)?;
Ok(())
}
#[test]
fn test_mimic_server_config() -> Result<()> {
let s = fs::read_to_string("./example/mimic/server.toml").unwrap();
Config::from_str(&s)?;
Ok(())
}
}

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use std::time::Duration;
use anyhow::{Context, Result};
use socket2::{SockRef, TcpKeepalive};
use tokio::net::TcpStream;
// Tokio hesitates to expose this option...So we have to do it on our own :(
// The good news is that using socket2 it can be easily done, without losing portablity.
// See https://github.com/tokio-rs/tokio/issues/3082
pub fn set_tcp_keepalive(conn: &TcpStream) -> Result<()> {
let s = SockRef::from(conn);
let keepalive = TcpKeepalive::new().with_time(Duration::from_secs(60));
s.set_tcp_keepalive(&keepalive)
.with_context(|| "Failed to set keepalive")
}

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mod cli;
mod client;
mod config;
mod helper;
mod multi_map;
mod protocol;
mod server;
pub use cli::Cli;
pub use config::Config;
use anyhow::{anyhow, Result};
use tracing::debug;
use client::run_client;
use server::run_server;
pub async fn run(args: &Cli) -> Result<()> {
let config = Config::from_file(&args.config_path).await?;
tracing_subscriber::fmt::init();
debug!("{:?}", config);
// Raise `nofile` limit on linux and mac
fdlimit::raise_fd_limit();
match determine_run_mode(&config, &args) {
RunMode::Undetermine => Err(anyhow!("Cannot determine running as a server or a client")),
RunMode::Client => run_client(&config).await,
RunMode::Server => run_server(&config).await,
}
}
#[derive(PartialEq, Eq, Debug)]
enum RunMode {
Server,
Client,
Undetermine,
}
fn determine_run_mode(config: &Config, args: &Cli) -> RunMode {
use RunMode::*;
if args.client && args.server {
Undetermine
} else {
if args.client {
Client
} else if args.server {
Server
} else {
if config.server.is_some() && config.client.is_none() {
Server
} else if config.client.is_some() && config.server.is_none() {
Client
} else {
Undetermine
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_determine_run_mode() {
use config::*;
use RunMode::*;
struct T {
cfg_s: bool,
cfg_c: bool,
arg_s: bool,
arg_c: bool,
run_mode: RunMode,
}
let tests = [
T {
cfg_s: false,
cfg_c: false,
arg_s: false,
arg_c: false,
run_mode: Undetermine,
},
T {
cfg_s: true,
cfg_c: false,
arg_s: false,
arg_c: false,
run_mode: Server,
},
T {
cfg_s: false,
cfg_c: true,
arg_s: false,
arg_c: false,
run_mode: Client,
},
T {
cfg_s: true,
cfg_c: true,
arg_s: false,
arg_c: false,
run_mode: Undetermine,
},
T {
cfg_s: true,
cfg_c: true,
arg_s: true,
arg_c: false,
run_mode: Server,
},
T {
cfg_s: true,
cfg_c: true,
arg_s: false,
arg_c: true,
run_mode: Client,
},
T {
cfg_s: true,
cfg_c: true,
arg_s: true,
arg_c: true,
run_mode: Undetermine,
},
];
for t in tests {
let config = Config {
server: match t.cfg_s {
true => Some(ServerConfig::default()),
false => None,
},
client: match t.cfg_c {
true => Some(ClientConfig::default()),
false => None,
},
};
let args = Cli {
config_path: std::path::PathBuf::new(),
server: t.arg_s,
client: t.arg_c,
};
assert_eq!(determine_run_mode(&config, &args), t.run_mode);
}
}
}

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use anyhow::Result;
use clap::Parser;
use rathole::{run, Cli};
use tokio;
#[tokio::main]
async fn main() -> Result<()> {
let args = Cli::parse();
run(&args).await
}

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use std::borrow::Borrow;
use std::collections::HashMap;
use std::hash::{Hash, Hasher};
struct RawItem<K1, K2, V>(*mut (K1, K2, V));
unsafe impl<K1, K2, V> Send for RawItem<K1, K2, V> {}
unsafe impl<K1, K2, V> Sync for RawItem<K1, K2, V> {}
pub struct MultiMap<K1, K2, V> {
map1: HashMap<Key<K1>, RawItem<K1, K2, V>>,
map2: HashMap<Key<K2>, RawItem<K1, K2, V>>,
}
struct Key<T>(*const T);
unsafe impl<T> Send for Key<T> {}
unsafe impl<T> Sync for Key<T> {}
impl<T> Borrow<T> for Key<T> {
fn borrow(&self) -> &T {
unsafe { &*self.0 }
}
}
impl<T: Hash> Hash for Key<T> {
fn hash<H: Hasher>(&self, state: &mut H) {
(self.borrow() as &T).hash(state)
}
}
impl<T: PartialEq> PartialEq for Key<T> {
fn eq(&self, other: &Self) -> bool {
(self.borrow() as &T).eq(other.borrow())
}
}
impl<T: Eq> Eq for Key<T> {}
impl<K1, K2, V> MultiMap<K1, K2, V> {
pub fn new() -> Self {
MultiMap {
map1: HashMap::new(),
map2: HashMap::new(),
}
}
}
#[allow(dead_code)]
impl<K1, K2, V> MultiMap<K1, K2, V>
where
K1: Hash + Eq + Send,
K2: Hash + Eq + Send,
V: Send,
{
pub fn insert(&mut self, k1: K1, k2: K2, v: V) -> Result<(), (K1, K2, V)> {
if self.map1.contains_key(&k1) || self.map2.contains_key(&k2) {
return Err((k1, k2, v));
}
let item = Box::new((k1, k2, v));
let k1 = Key(&item.0);
let k2 = Key(&item.1);
let item = Box::into_raw(item);
self.map1.insert(k1, RawItem(item));
self.map2.insert(k2, RawItem(item));
Ok(())
}
pub fn get1(&self, k1: &K1) -> Option<&V> {
let item = self.map1.get(k1)?;
let item = unsafe { &*item.0 };
Some(&item.2)
}
pub fn get1_mut(&mut self, k1: &K1) -> Option<&mut V> {
let item = self.map1.get(k1)?;
let item = unsafe { &mut *item.0 };
Some(&mut item.2)
}
pub fn get2(&self, k2: &K2) -> Option<&V> {
let item = self.map2.get(k2)?;
let item = unsafe { &*item.0 };
Some(&item.2)
}
pub fn get_mut2(&mut self, k2: &K2) -> Option<&mut V> {
let item = self.map2.get(k2)?;
let item = unsafe { &mut *item.0 };
Some(&mut item.2)
}
pub fn remove1(&mut self, k1: &K1) -> Option<V> {
let item = self.map1.remove(k1)?;
let item = unsafe { Box::from_raw(item.0) };
self.map2.remove(&item.1);
Some(item.2)
}
pub fn remove2(&mut self, k2: &K2) -> Option<V> {
let item = self.map2.remove(k2)?;
let item = unsafe { Box::from_raw(item.0) };
self.map1.remove(&item.0);
Some(item.2)
}
}
impl<K1, K2, V> Drop for MultiMap<K1, K2, V> {
fn drop(&mut self) {
self.map1.clear();
self.map2
.drain()
.for_each(|(_, item)| drop(unsafe { Box::from_raw(item.0) }));
}
}

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pub const HASH_WIDTH_IN_BYTES: usize = 32;
use anyhow::{Context, Result};
use bincode;
use lazy_static::lazy_static;
use serde::{Deserialize, Serialize};
use tokio::io::AsyncReadExt;
use tokio::net::TcpStream;
type ProtocolVersion = u8;
const PROTO_V0: u8 = 0u8;
pub const CURRENT_PROTO_VRESION: ProtocolVersion = PROTO_V0;
pub type Digest = [u8; HASH_WIDTH_IN_BYTES];
#[derive(Deserialize, Serialize, Debug)]
pub enum Hello {
ControlChannelHello(ProtocolVersion, Digest), // sha256sum(service name) or a nonce
DataChannelHello(ProtocolVersion, Digest), // token provided by CreateDataChannel
}
#[derive(Deserialize, Serialize, Debug)]
pub struct Auth(pub Digest);
#[derive(Deserialize, Serialize, Debug)]
pub enum Ack {
Ok,
ServiceNotExist,
AuthFailed,
}
impl std::fmt::Display for Ack {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{}",
match self {
Ack::Ok => "Ok",
Ack::ServiceNotExist => "Service not exist",
Ack::AuthFailed => "Incorrect token",
}
)
}
}
#[derive(Deserialize, Serialize, Debug)]
pub enum ControlChannelCmd {
CreateDataChannel,
}
#[derive(Deserialize, Serialize, Debug)]
pub enum DataChannelCmd {
StartForward,
}
pub fn digest(data: &[u8]) -> Digest {
let d = ring::digest::digest(&ring::digest::SHA256, data);
d.as_ref().try_into().unwrap()
}
struct PacketLength {
hello: usize,
ack: usize,
auth: usize,
c_cmd: usize,
d_cmd: usize,
}
impl PacketLength {
pub fn new() -> PacketLength {
let username = "default";
let d = digest(username.as_bytes());
let hello = bincode::serialized_size(&Hello::ControlChannelHello(CURRENT_PROTO_VRESION, d))
.unwrap() as usize;
let c_cmd =
bincode::serialized_size(&ControlChannelCmd::CreateDataChannel).unwrap() as usize;
let d_cmd = bincode::serialized_size(&DataChannelCmd::StartForward).unwrap() as usize;
let ack = Ack::Ok;
let ack = bincode::serialized_size(&ack).unwrap() as usize;
let auth = bincode::serialized_size(&Auth(d)).unwrap() as usize;
PacketLength {
hello,
ack,
auth,
c_cmd,
d_cmd,
}
}
}
lazy_static! {
static ref PACKET_LEN: PacketLength = PacketLength::new();
}
pub async fn read_hello(conn: &mut TcpStream) -> Result<Hello> {
let mut buf = vec![0u8; PACKET_LEN.hello];
conn.read_exact(&mut buf)
.await
.with_context(|| "Failed to read hello")?;
let hello = bincode::deserialize(&buf).with_context(|| "Failed to deserialize hello")?;
Ok(hello)
}
pub async fn read_auth(conn: &mut TcpStream) -> Result<Auth> {
let mut buf = vec![0u8; PACKET_LEN.auth];
conn.read_exact(&mut buf)
.await
.with_context(|| "Failed to read auth")?;
bincode::deserialize(&buf).with_context(|| "Failed to deserialize auth")
}
pub async fn read_ack(conn: &mut TcpStream) -> Result<Ack> {
let mut bytes = vec![0u8; PACKET_LEN.ack];
conn.read_exact(&mut bytes)
.await
.with_context(|| "Failed to read ack")?;
bincode::deserialize(&bytes).with_context(|| "Failed to deserialize ack")
}
pub async fn read_control_cmd(conn: &mut TcpStream) -> Result<ControlChannelCmd> {
let mut bytes = vec![0u8; PACKET_LEN.c_cmd];
conn.read_exact(&mut bytes)
.await
.with_context(|| "Failed to read control cmd")?;
bincode::deserialize(&bytes).with_context(|| "Failed to deserialize control cmd")
}
pub async fn read_data_cmd(conn: &mut TcpStream) -> Result<DataChannelCmd> {
let mut bytes = vec![0u8; PACKET_LEN.d_cmd];
conn.read_exact(&mut bytes)
.await
.with_context(|| "Failed to read data cmd")?;
bincode::deserialize(&bytes).with_context(|| "Failed to deserialize data cmd")
}

389
src/server.rs Normal file
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@ -0,0 +1,389 @@
use std::collections::HashMap;
use std::net::SocketAddr;
use std::sync::Arc;
use std::time::Duration;
use crate::config::{Config, ServerConfig, ServerServiceConfig};
use crate::helper::set_tcp_keepalive;
use crate::multi_map::MultiMap;
use crate::protocol::{
self, read_hello, Hello, Hello::ControlChannelHello, Hello::DataChannelHello,
};
use crate::protocol::{read_auth, Ack, ControlChannelCmd, DataChannelCmd, HASH_WIDTH_IN_BYTES};
use anyhow::{anyhow, bail, Context, Result};
use rand::RngCore;
use tokio::io::{self, AsyncWriteExt};
use tokio::sync::mpsc;
use tokio::sync::{oneshot, RwLock};
use tokio::time;
use tokio::{
self,
net::{self, TcpListener, TcpStream},
};
use tracing::{debug, error, info, info_span, warn, Instrument};
use backoff::{backoff::Backoff, ExponentialBackoff};
type ServiceDigest = protocol::Digest;
type Nonce = protocol::Digest;
const POOL_SIZE: usize = 64;
const CHAN_SIZE: usize = 2048;
pub async fn run_server(config: &Config) -> Result<()> {
let mut server = Server::from(config)?;
server.run().await
}
type ControlChannelMap = MultiMap<ServiceDigest, Nonce, ControlChannelHandle>;
struct Server<'a> {
config: &'a ServerConfig,
services: Arc<RwLock<HashMap<ServiceDigest, ServerServiceConfig>>>,
control_channels: Arc<RwLock<ControlChannelMap>>,
}
impl<'a> Server<'a> {
pub fn from(config: &'a Config) -> Result<Server> {
match &config.server {
Some(config) => Ok(Server {
config,
services: Arc::new(RwLock::new(Server::generate_service_hashmap(config))),
control_channels: Arc::new(RwLock::new(ControlChannelMap::new())),
}),
None =>
Err(anyhow!("Try to run as a server, but the configuration is missing. Please add the `[server]` block"))
}
}
fn generate_service_hashmap(
server_config: &ServerConfig,
) -> HashMap<ServiceDigest, ServerServiceConfig> {
let mut ret = HashMap::new();
for u in &server_config.services {
ret.insert(protocol::digest(u.0.as_bytes()), (*u.1).clone());
}
ret
}
pub async fn run(&mut self) -> Result<()> {
let l = net::TcpListener::bind(&self.config.bind_addr)
.await
.with_context(|| "Failed to listen at `server.bind_addr`")?;
info!("Listening at {}", self.config.bind_addr);
// Retry at least every 100ms
let mut backoff = ExponentialBackoff {
max_interval: Duration::from_millis(100),
max_elapsed_time: None,
..Default::default()
};
// Listen for incoming control or data channels
loop {
tokio::select! {
ret = l.accept() => {
match ret {
Err(err) => {
// Possibly a EMFILE. So sleep for a while and retry
if let Some(d) = backoff.next_backoff() {
error!("Failed to accept: {}. Retry in {:?}...", err, d);
time::sleep(d).await;
} else {
// This branch will never be executed according to the current retry policy
error!("Too many retries. Aborting...");
break;
}
}
Ok((conn, addr)) => {
backoff.reset();
debug!("Incomming connection from {}", addr);
let services = self.services.clone();
let control_channels = self.control_channels.clone();
tokio::spawn(async move {
if let Err(err) = handle_connection(conn, addr, services, control_channels).await.with_context(||"Failed to handle a connection to `server.bind_addr`") {
error!("{:?}", err);
}
}.instrument(info_span!("handle_connection", %addr)));
}
}
},
_ = tokio::signal::ctrl_c() => {
info!("Shuting down gracefully...");
break;
}
}
}
Ok(())
}
}
async fn handle_connection(
mut conn: TcpStream,
addr: SocketAddr,
services: Arc<RwLock<HashMap<ServiceDigest, ServerServiceConfig>>>,
control_channels: Arc<RwLock<ControlChannelMap>>,
) -> Result<()> {
// Read hello
let hello = read_hello(&mut conn).await?;
match hello {
ControlChannelHello(_, service_digest) => {
info!("New control channel incomming from {}", addr);
// Generate a nonce
let mut nonce = vec![0u8; HASH_WIDTH_IN_BYTES];
rand::thread_rng().fill_bytes(&mut nonce);
// Send hello
let hello_send = Hello::ControlChannelHello(
protocol::CURRENT_PROTO_VRESION,
nonce.clone().try_into().unwrap(),
);
conn.write_all(&bincode::serialize(&hello_send).unwrap())
.await?;
// Lookup the service
let services_guard = services.read().await;
let service_config = match services_guard.get(&service_digest) {
Some(v) => v,
None => {
conn.write_all(&bincode::serialize(&Ack::ServiceNotExist).unwrap())
.await?;
bail!("No such a service {}", hex::encode(&service_digest));
}
};
let service_name = &service_config.name;
// Calculate the checksum
let mut concat = Vec::from(service_config.token.as_ref().unwrap().as_bytes());
concat.append(&mut nonce);
// Read auth
let d = match read_auth(&mut conn).await? {
protocol::Auth(v) => v,
};
// Validate
let session_key = protocol::digest(&concat);
if session_key != d {
conn.write_all(&bincode::serialize(&Ack::AuthFailed).unwrap())
.await?;
debug!(
"Expect {}, but got {}",
hex::encode(session_key),
hex::encode(d)
);
bail!("Service {} failed the authentication", service_name);
} else {
let mut h = control_channels.write().await;
if let Some(_) = h.remove1(&service_digest) {
warn!(
"Dropping previous control channel for digest {}",
hex::encode(service_digest)
);
}
let service_config = service_config.clone();
drop(services_guard);
// Send ack
conn.write_all(&bincode::serialize(&Ack::Ok).unwrap())
.await?;
info!(service = %service_config.name, "Control channel established");
let handle = ControlChannelHandle::new(conn, service_config);
// Drop the old handle
let _ = h.insert(service_digest, session_key, handle);
}
}
DataChannelHello(_, nonce) => {
// Validate
let control_channels_guard = control_channels.read().await;
match control_channels_guard.get2(&nonce) {
Some(c_ch) => {
if let Err(e) = set_tcp_keepalive(&conn) {
error!("The connection may be unstable! {:?}", e);
}
// Send the data channel to the corresponding control channel
c_ch.conn_pool.data_ch_tx.send(conn).await?;
}
None => {
warn!("Data channel has incorrect nonce");
}
}
}
}
Ok(())
}
struct ControlChannel {
conn: TcpStream,
service: ServerServiceConfig,
shutdown_rx: oneshot::Receiver<bool>,
visitor_tx: mpsc::Sender<TcpStream>,
}
struct ControlChannelHandle {
shutdown_tx: oneshot::Sender<bool>,
conn_pool: ConnectionPoolHandle,
}
impl ControlChannelHandle {
fn new(conn: TcpStream, service: ServerServiceConfig) -> ControlChannelHandle {
let (shutdown_tx, shutdown_rx) = oneshot::channel::<bool>();
let name = service.name.clone();
let conn_pool = ConnectionPoolHandle::new();
let actor = ControlChannel {
conn,
shutdown_rx,
service,
visitor_tx: conn_pool.visitor_tx.clone(),
};
tokio::spawn(async move {
if let Err(err) = actor.run().await {
error!(%name, "{}", err);
}
});
ControlChannelHandle {
shutdown_tx,
conn_pool,
}
}
}
impl ControlChannel {
#[tracing::instrument(skip(self), fields(service = %self.service.name))]
async fn run(mut self) -> Result<()> {
if let Err(e) = set_tcp_keepalive(&self.conn) {
error!("The connection may be unstable! {:?}", e);
}
let l = match TcpListener::bind(&self.service.bind_addr).await {
Ok(v) => v,
Err(e) => {
let duration = Duration::from_secs(1);
error!(
"Failed to listen on service.bind_addr: {}. Retry in {:?}...",
e, duration
);
time::sleep(duration).await;
TcpListener::bind(&self.service.bind_addr).await?
}
};
info!("Listening at {}", &self.service.bind_addr);
let (data_req_tx, mut data_req_rx) = mpsc::unbounded_channel::<u8>();
tokio::spawn(async move {
let cmd = bincode::serialize(&ControlChannelCmd::CreateDataChannel).unwrap();
while let Some(_) = data_req_rx.recv().await {
if self.conn.write_all(&cmd).await.is_err() {
break;
}
}
});
for _i in 0..POOL_SIZE {
if let Err(e) = data_req_tx.send(0) {
error!("Failed to request data channel {}", e);
};
}
let mut backoff = ExponentialBackoff {
max_interval: Duration::from_secs(1),
..Default::default()
};
loop {
tokio::select! {
val = l.accept() => {
match val {
Err(e) => {
error!("{}. Sleep for a while", e);
if let Some(d) = backoff.next_backoff() {
time::sleep(d).await;
} else {
error!("Too many retries. Aborting...");
break;
}
},
Ok((incoming, addr)) => {
if let Err(e) = data_req_tx.send(0) {
error!("{}", e);
break;
};
backoff.reset();
debug!("New visitor from {}", addr);
let _ = self.visitor_tx.send(incoming).await;
}
}
},
_ = &mut self.shutdown_rx => {
break;
}
}
}
info!("Service shuting down");
Ok(())
}
}
#[derive(Debug)]
struct ConnectionPool {
visitor_rx: mpsc::Receiver<TcpStream>,
data_ch_rx: mpsc::Receiver<TcpStream>,
}
struct ConnectionPoolHandle {
visitor_tx: mpsc::Sender<TcpStream>,
data_ch_tx: mpsc::Sender<TcpStream>,
}
impl ConnectionPoolHandle {
fn new() -> ConnectionPoolHandle {
let (data_ch_tx, data_ch_rx) = mpsc::channel(CHAN_SIZE * 2);
let (visitor_tx, visitor_rx) = mpsc::channel(CHAN_SIZE);
let conn_pool = ConnectionPool {
data_ch_rx,
visitor_rx,
};
tokio::spawn(async move { conn_pool.run().await });
ConnectionPoolHandle {
data_ch_tx,
visitor_tx,
}
}
}
impl ConnectionPool {
#[tracing::instrument]
async fn run(mut self) {
loop {
if let Some(mut visitor) = self.visitor_rx.recv().await {
if let Some(mut ch) = self.data_ch_rx.recv().await {
tokio::spawn(async move {
let cmd = bincode::serialize(&DataChannelCmd::StartForward).unwrap();
if ch.write_all(&cmd).await.is_ok() {
let _ = io::copy_bidirectional(&mut ch, &mut visitor).await;
}
});
} else {
break;
}
} else {
break;
}
}
}
}