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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
//! Multicast Network Dispatcher and Proxy
//!
//! # MPROXY: Forwarding Proxy
//! Forward TLS/TCP, UDP, or Multicast endpoints to a downstream UDP socket address.
//! Use feature `tls` to enable TLS provided by crate `rustls`.
//!
//!
//! ## Quick Start
//! In `Cargo.toml`
//! ```toml
//! [dependencies]
//! mproxy-forward = { version = "0.1", features = ["tls"] }
//! ```
//!
//! Example `src/main.rs`
//! ```rust,no_run
//! use std::thread::JoinHandle;
//!
//! use mproxy_forward::{forward_udp, proxy_tcp_udp};
//!
//! let udp_listen_addr: String ="[ff02::1]:9920".into();
//! let udp_downstream_addrs = vec!["[::1]:9921".into(), "localhost:9922".into()];
//! let tcp_connect_addr: String = "localhost:9925".into();
//! let tee = true; // copy input to stdout
//!
//! let mut threads: Vec<JoinHandle<()>> = vec![];
//!
//! // spawn UDP socket listener and forward to downstream addresses
//! threads.push(forward_udp(udp_listen_addr.clone(), &udp_downstream_addrs, tee));
//!
//! // connect to TCP upstream, and forward to UDP socket listener
//! threads.push(proxy_tcp_udp(tcp_connect_addr, udp_listen_addr));
//!
//! for thread in threads {
//! thread.join().unwrap();
//! }
//! ```
//!
//! ## Command Line Interface
//! Install with cargo
//! ```bash
//! cargo install mproxy-forward
//! ```
//!
//! ```text
//! MPROXY: Forwarding Proxy
//!
//! Forward TLS/TCP, UDP, or Multicast endpoints to a downstream UDP socket address.
//!
//! USAGE:
//! mproxy-forward [FLAGS] [OPTIONS]
//!
//! OPTIONS:
//! --udp-listen-addr [HOSTNAME:PORT] UDP listening socket address. May be repeated
//! --udp-downstream-addr [HOSTNAME:PORT] UDP downstream socket address. May be repeated
//! --tcp-connect-addr [HOSTNAME:PORT] Connect to TCP host, forwarding stream. May be repeated
//!
//! FLAGS:
//! -h, --help Prints help information
//! -t, --tee Copy input to stdout
//!
//! EXAMPLE:
//! mproxy-forward --udp-listen-addr '0.0.0.0:9920' \
//! --udp-downstream-addr '[::1]:9921' \
//! --udp-downstream-addr 'localhost:9922' \
//! --tcp-connect-addr 'localhost:9925' \
//! --tee
//! ```
//!
//! ### See Also
//! - [mproxy-client](https://docs.rs/mproxy-client/)
//! - [mproxy-server](https://docs.rs/mproxy-server/)
//! - [mproxy-forward](https://docs.rs/mproxy-forward/)
//! - [mproxy-reverse](https://docs.rs/mproxy-reverse/)
//!
use std::io::{stdout, BufWriter, Read, Write};
use std::net::{SocketAddr, TcpStream, UdpSocket};
use std::thread::{spawn, Builder, JoinHandle};
use mproxy_client::target_socket_interface;
use mproxy_server::upstream_socket_interface;
const BUFSIZE: usize = 8096;
/// Forward UDP upstream `listen_addr` to downstream UDP socket addresses.
/// `listen_addr` may be a multicast address.
pub fn forward_udp(listen_addr: String, downstream_addrs: &[String], tee: bool) -> JoinHandle<()> {
let (_addr, listen_socket) =
upstream_socket_interface(listen_addr).expect("binding server socket listener");
let mut output_buffer = BufWriter::new(stdout());
let targets: Vec<(SocketAddr, UdpSocket)> = downstream_addrs
.iter()
.map(|t| target_socket_interface(t).expect("binding client socket sender"))
.collect();
let mut buf = [0u8; BUFSIZE]; // receive buffer
Builder::new()
.name(format!("{:#?}", listen_socket))
.spawn(move || {
//listen_socket.read_timeout().unwrap();
listen_socket.set_broadcast(true).unwrap();
loop {
match listen_socket.recv_from(&mut buf[0..]) {
Ok((c, _remote_addr)) => {
for (target_addr, target_socket) in &targets {
if !(target_addr.is_ipv6() && target_addr.ip().is_multicast()) {
target_socket
.send_to(&buf[0..c], target_addr)
.unwrap_or_else(|e| panic!("sending to server socket: {}", e));
} else {
target_socket
.send(&buf[0..c])
.unwrap_or_else(|e| panic!("sending to server socket: {}", e));
}
}
if tee {
let _o = output_buffer
.write(&buf[0..c])
.expect("writing to output buffer");
#[cfg(debug_assertions)]
assert!(c == _o);
}
}
Err(err) => {
//output_buffer.flush().unwrap();
eprintln!("forward_udp: got an error: {}", err);
#[cfg(debug_assertions)]
panic!("forward_udp: got an error: {}", err);
}
}
output_buffer.flush().unwrap();
}
})
.unwrap()
}
/// Wrapper for forward_udp listening on multiple upstream addresses
pub fn proxy_gateway(
downstream_addrs: &[String],
listen_addrs: &[String],
tee: bool,
) -> Vec<JoinHandle<()>> {
let mut threads: Vec<JoinHandle<()>> = vec![];
for listen_addr in listen_addrs {
#[cfg(debug_assertions)]
println!(
"proxy: forwarding {:?} -> {:?}",
listen_addr, downstream_addrs
);
threads.push(forward_udp(listen_addr.to_string(), downstream_addrs, tee));
}
threads
}
/// Connect to TCP upstream server, and forward received bytes to a
/// downstream UDP socket socket address.
/// TLS can be enabled with feature `tls` (provided by crate `rustls`).
pub fn proxy_tcp_udp(upstream_tcp: String, downstream_udp: String) -> JoinHandle<()> {
let mut buf = [0u8; BUFSIZE];
#[cfg(debug_assertions)]
println!(
"proxy: forwarding TCP {:?} -> UDP {:?}",
upstream_tcp, downstream_udp
);
spawn(move || loop {
let target = target_socket_interface(&downstream_udp);
let (target_addr, target_socket) = if let Ok((target_addr, target_socket)) = target {
(target_addr, target_socket)
} else {
println!("Retrying...");
std::thread::sleep(std::time::Duration::from_secs(5));
continue;
};
#[cfg(feature = "tls")]
let (mut conn, mut stream) =
if let Ok((conn, stream)) = tls_connection(upstream_tcp.clone()) {
(conn, stream)
} else {
println!("Retrying...");
std::thread::sleep(std::time::Duration::from_secs(5));
continue;
};
#[cfg(feature = "tls")]
let mut stream = TlsStream::new(&mut conn, &mut stream);
#[cfg(not(feature = "tls"))]
let stream = TcpStream::connect(upstream_tcp.clone());
#[cfg(not(feature = "tls"))]
let mut stream = if let Ok(s) = stream {
s
} else {
println!("Retrying...");
std::thread::sleep(std::time::Duration::from_secs(5));
continue;
};
loop {
match stream.read(&mut buf[0..]) {
Ok(c) => {
if c == 0 {
eprintln!("encountered EOF, disconnecting TCP proxy thread...");
break;
}
if !(target_addr.is_ipv6() && target_addr.ip().is_multicast()) {
target_socket
.send_to(&buf[0..c], target_addr)
.expect("sending to UDP socket");
} else {
target_socket
.send(&buf[0..c])
.expect("sending to UDP socket");
}
}
Err(e) => {
eprintln!("err: {}", e);
break;
}
}
}
println!("Retrying...");
std::thread::sleep(std::time::Duration::from_secs(5))
})
}
#[cfg(feature = "tls")]
use rustls::client::{ClientConfig, ClientConnection, ServerName};
#[cfg(feature = "tls")]
use rustls::Stream as TlsStream;
#[cfg(feature = "tls")]
use std::sync::Arc;
#[cfg(feature = "tls")]
use webpki_roots::TLS_SERVER_ROOTS;
#[cfg(feature = "tls")]
pub fn tls_connection(
tls_connect_addr: String,
) -> Result<(ClientConnection, TcpStream), Box<dyn std::error::Error>> {
let mut root_store = rustls::RootCertStore::empty();
root_store.add_server_trust_anchors(TLS_SERVER_ROOTS.0.iter().map(|ta| {
rustls::OwnedTrustAnchor::from_subject_spki_name_constraints(
ta.subject,
ta.spki,
ta.name_constraints,
)
}));
let config = rustls::ClientConfig::builder()
.with_safe_defaults()
.with_root_certificates(root_store)
.with_no_client_auth();
let rc_config: Arc<ClientConfig> = Arc::new(config);
let dns_name: String = tls_connect_addr.split(':').next().unwrap().to_string();
let server_name = ServerName::try_from(dns_name.as_str());
let server_name = if let Ok(name) = server_name {
name
} else {
return Err(format!("Resolving DNS for {}", dns_name).into());
};
let conn = rustls::ClientConnection::new(rc_config, server_name);
let mut conn = if let Ok(c) = conn {
c
} else {
return Err("Performing handshake".into());
};
let sock = TcpStream::connect(tls_connect_addr.clone());
let sock = if let Ok(s) = sock {
s
} else {
return Err(format!("Connecting to {}", tls_connect_addr).into());
};
sock.set_nodelay(true).unwrap();
// request tls
let request = format!(
"GET / HTTP/1.1\r\n\
Host: {}\r\n\
Connection: close\r\n\
Accept-Encoding: identity\r\n\
\r\n",
tls_connect_addr
);
if let Some(mut early_data) = conn.early_data() {
early_data.write_all(request.as_bytes()).unwrap();
}
Ok((conn, sock))
}