h2sr 0.1.0

http-to-socks5 proxy router
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205

use futures_util::future::try_join;
use std::fs;
use std::{convert::Infallible, net::SocketAddr};

use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Client, Method, Request, Response, Server};

use anyhow::anyhow;
use h2sr::Pattern;
use serde::Deserialize;
use std::borrow::Cow;
use std::path::Path;
use tokio::net::tcp::{ReadHalf, WriteHalf};
use tokio::net::{lookup_host, TcpStream};

type HttpClient = Client<hyper::client::HttpConnector>;

#[derive(Clone, Copy)]
pub struct Socks5Proxy(SocketAddr);

impl Socks5Proxy {
  pub async fn connect(&self, auth: &str, req: Request<Body>) {
    match tokio_socks::tcp::Socks5Stream::connect(self.0, &*auth).await {
      Ok(mut stream) => tunnel(auth, req, stream.split()).await,
      Err(e) => eprintln!("{}: socks5 connect error: {:?}", auth, e),
    }
  }
}
pub struct Env {
  pub listen: SocketAddr,
  pub to: Socks5Proxy,
  pub proxy: Pattern,
  pub block: Pattern,
}

#[derive(Deserialize)]
pub struct Config {
  pub listen: SocketAddr,
  pub to: SocketAddr,
  pub proxy: Vec<String>,
  pub block: Vec<String>,
}

async fn load_env() -> Env {
  let matches = clap::App::new("Http socks router")
    .author("Jason D.H. Lee <jason5lee@hotmail.com>")
    .arg(
      clap::Arg::with_name("config")
        .short("c")
        .long("config")
        .value_name("FILE")
        .help("The config file, default \".h2sr.toml\" in user directory.")
        .takes_value(true),
    )
    .get_matches();

  let config: Cow<'_, Path> = matches
    .value_of("config")
    .map(|path| Path::new(path).into())
    .unwrap_or_else(|| {
      let user_dir = directories::UserDirs::new().expect("unable to get user directory");
      let mut path = user_dir.home_dir().to_owned();
      path.push(".h2sr.toml");
      path.into()
    });
  let config = fs::read(config).expect("unable to read config file");

  let config: Config = toml::from_slice(&config).expect("config file error");

  let proxy =
    Pattern::from_strs(config.proxy.iter().map(|s| &*s as &str)).expect("proxy config error");
  let block =
    Pattern::from_strs(config.block.iter().map(|s| &*s as &str)).expect("block config error");

  Env {
    listen: config.listen,
    to: Socks5Proxy(config.to),
    proxy,
    block,
  }
}
// To try this example:
// 1. cargo run --example http_proxy
// 2. config http_proxy in command line
//    $ export http_proxy=http://127.0.0.1:8100
//    $ export https_proxy=http://127.0.0.1:8100
// 3. send requests
//    $ curl -i https://www.some_domain.com/
#[tokio::main]
async fn main() {
  let env: &'static _ = Box::leak(Box::new(load_env().await));

  let client = HttpClient::new();

  let make_service = make_service_fn(move |_| {
    let client = client.clone();
    async move { Ok::<_, Infallible>(service_fn(move |req| proxy(env, client.clone(), req))) }
  });

  let server = Server::bind(&env.listen).serve(make_service);

  println!("Listening on http://{}", env.listen);

  if let Err(e) = server.await {
    eprintln!("server error: {}", e);
  }
}

async fn proxy(
  env: &'static Env,
  client: HttpClient,
  req: Request<Body>,
) -> anyhow::Result<Response<Body>> {
  // println!("req: {:?}", req);

  if Method::CONNECT == req.method() {
    // Received an HTTP request like:
    // ```
    // CONNECT www.domain.com:443 HTTP/1.1
    // Host: www.domain.com:443
    // Proxy-Connection: Keep-Alive
    // ```
    //
    // When HTTP method is CONNECT we should return an empty body
    // then we can eventually upgrade the connection and talk a new protocol.
    //
    // Note: only after client received an empty body with STATUS_OK can the
    // connection be upgraded, so we can't return a response inside
    // `on_upgrade` future.
    let uri = req.uri();
    let auth = uri
      .authority()
      .ok_or_else(|| anyhow!("CONNECT host is not socket addr: {:?}", uri))?;
    let host = auth.host().as_bytes();
    let auth = auth.to_string();
    let to = &env.to;
    if env.block.contain_host(host) {
      println!("BLOCK {}", auth);
    } else if env.proxy.contain_host(host) {
      println!("PROXY {}", auth);
      tokio::task::spawn(async move { to.connect(&auth, req).await });
    } else {
      tokio::task::spawn(async move {
        match lookup_host(&auth).await {
          Err(e) => eprintln!("lookup host {} error: {:?}.", auth, e),
          Ok(mut host) => match host.next() {
            None => eprintln!("lookup host {} error: no ip found.", auth),
            Some(ip) => {
              if env.proxy.contain_ip(&ip.ip()) {
                println!("PROXY {}", auth);
                to.connect(&auth, req).await;
              } else {
                println!("DIRECT {}", auth);
                match TcpStream::connect(&*auth).await {
                  Ok(mut stream) => tunnel(&auth, req, stream.split()).await,
                  Err(e) => eprintln!("{}: direct connect error: {:?}", auth, e),
                }
              }
            }
          },
        }
      });
    };

    Ok(Response::new(Body::empty()))
  } else {
    Ok(client.request(req).await?)
  }
}

// Create a TCP connection to host:port, build a tunnel between the connection and
// the upgraded connection
async fn tunnel(
  auth: &str,
  req: Request<Body>,
  (mut server_rd, mut server_wr): (ReadHalf<'_>, WriteHalf<'_>),
) {
  match hyper::upgrade::on(req).await {
    Ok(upgraded) => {
      // Proxying data
      let amounts = {
        let (mut client_rd, mut client_wr) = tokio::io::split(upgraded);

        let client_to_server = tokio::io::copy(&mut client_rd, &mut server_wr);
        let server_to_client = tokio::io::copy(&mut server_rd, &mut client_wr);

        try_join(client_to_server, server_to_client).await
      };

      // Print message when done
      match amounts {
        Ok((from_client, from_server)) => {
          println!(
            "{}: client wrote {} bytes and received {} bytes",
            auth, from_client, from_server
          );
        }
        Err(e) => {
          eprintln!("{}: tunnel error: {}", auth, e);
        }
      };
    }
    Err(e) => eprintln!("{}: upgrade error: {}", auth, e),
  }
}