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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,163 @@ | ||
| // | ||
| // Copyright 2024 Signal Messenger, LLC. | ||
| // SPDX-License-Identifier: AGPL-3.0-only | ||
| // | ||
|
|
||
| //! Connects to a provided proxy host and then shuffles bytes to/from stdout/stdin. | ||
| //! | ||
| //! This makes an HTTP request through an HTTPS proxy: | ||
| //! ```text | ||
| //! #!/bin/bash | ||
| //! # This example uses https://tinyproxy.github.io/ with the following config: | ||
| //! # > Port 8888 | ||
| //! # > Listen 127.0.0.1 | ||
| //! # > Allow 127.0.0.1 | ||
| //! PROXY_URL=http://127.0.0.1:8888; | ||
| //! # Send an HTTP 1.1 request, then hold STDIN open so the example doesn't exit. | ||
| //! bash -c 'echo -en "GET / HTTP/1.1\r\nHost: signal.org\r\n\r\n"; cat' | \ | ||
| //! # Run the example, pointing it at an HTTP(S) proxy that supports CONNECT. | ||
| //! cargo run -p libsignal-net --example https_proxy -- $PROXY_URL signal.org:80 | ||
| //! ``` | ||
| use std::net::SocketAddr; | ||
| use std::num::NonZeroU16; | ||
| use std::str::FromStr; | ||
| use std::sync::Arc; | ||
|
|
||
| use clap::Parser; | ||
| use either::Either; | ||
| use futures_util::stream::FuturesUnordered; | ||
| use futures_util::StreamExt; | ||
| use libsignal_net::infra::certs::RootCertificates; | ||
| use libsignal_net::infra::dns::DnsResolver; | ||
| use libsignal_net::infra::host::Host; | ||
| use libsignal_net_infra::route::{ | ||
| ConnectorExt as _, HttpProxyAuth, HttpProxyRouteFragment, HttpsProxyRoute, ProxyTarget, | ||
| TcpRoute, TlsRoute, TlsRouteFragment, UnresolvedHost, | ||
| }; | ||
| use libsignal_net_infra::Alpn; | ||
| use tokio::time::Duration; | ||
| use url::Url; | ||
|
|
||
| #[derive(Clone, Debug, Parser)] | ||
| struct Args { | ||
| proxy_url: Url, | ||
| #[arg(value_parser = parse_target)] | ||
| target: Target, | ||
|
|
||
| #[arg(default_value_t = false, long)] | ||
| resolve_hostname_locally: bool, | ||
| } | ||
|
|
||
| #[derive(Clone, Debug)] | ||
| struct Target(Host<Arc<str>>, NonZeroU16); | ||
|
|
||
| fn parse_target(target: &str) -> Result<Target, &'static str> { | ||
| if let Ok(target) = SocketAddr::from_str(target) { | ||
| let port = NonZeroU16::new(target.port()).ok_or("expected nonzero port")?; | ||
| return Ok(Target(Host::Ip(target.ip()), port)); | ||
| } | ||
|
|
||
| let (domain, port) = target.split_once(':').ok_or("expected host:port")?; | ||
| let port = NonZeroU16::from_str(port).map_err(|_| "expected valid port")?; | ||
| Ok(Target(Host::Domain(domain.into()), port)) | ||
| } | ||
|
|
||
| #[tokio::main] | ||
| async fn main() { | ||
| env_logger::init(); | ||
|
|
||
| let Args { | ||
| proxy_url, | ||
| target, | ||
| resolve_hostname_locally, | ||
| } = Args::parse(); | ||
|
|
||
| let proxy_host = Host::<Arc<str>>::parse_as_ip_or_domain( | ||
| proxy_url.host_str().expect("proxy host was not provided"), | ||
| ); | ||
| let proxy_port = proxy_url | ||
| .port() | ||
| .expect("proxy port was not provided") | ||
| .try_into() | ||
| .expect("proxy port was zero"); | ||
|
|
||
| let root_certs = RootCertificates::Native; | ||
| let tcp_to_proxy = TcpRoute { | ||
| address: proxy_host.clone().map_domain(UnresolvedHost::from), | ||
| port: proxy_port, | ||
| }; | ||
| let inner = match proxy_url.scheme() { | ||
| "http" => Either::Right(tcp_to_proxy), | ||
| "https" => Either::Left(TlsRoute { | ||
| inner: tcp_to_proxy, | ||
| fragment: TlsRouteFragment { | ||
| root_certs, | ||
| sni: proxy_host.clone(), | ||
| alpn: Some(Alpn::Http1_1), | ||
| }, | ||
| }), | ||
| scheme => panic!("unsupported protocol {scheme}"), | ||
| }; | ||
| let username = (!proxy_url.username().is_empty()).then_some(proxy_url.username()); | ||
| let authorization = match (username, proxy_url.password()) { | ||
| (Some(username), Some(password)) => Some(HttpProxyAuth { | ||
| username: username.to_owned(), | ||
| password: password.to_owned(), | ||
| }), | ||
| (None, None) => None, | ||
| _ => panic!("only one of username or password was provided"), | ||
| }; | ||
|
|
||
| let dns_resolver = DnsResolver::new(&Default::default()); | ||
|
|
||
| let Target(target_host, target_port) = target; | ||
| let target_host = match (resolve_hostname_locally, target_host) { | ||
| (true, host) => ProxyTarget::ResolvedLocally(host.map_domain(UnresolvedHost::from)), | ||
| (false, Host::Ip(ip)) => ProxyTarget::ResolvedLocally(Host::Ip(ip)), | ||
| (false, Host::Domain(domain)) => ProxyTarget::ResolvedRemotely { name: domain }, | ||
| }; | ||
| let unresolved_route = HttpsProxyRoute { | ||
| inner, | ||
| fragment: HttpProxyRouteFragment { | ||
| target_host, | ||
| target_port, | ||
| authorization, | ||
| }, | ||
| }; | ||
| log::info!("unresolved: {unresolved_route:?}"); | ||
| let resolved = libsignal_net::infra::route::resolve_route(&dns_resolver, unresolved_route) | ||
| .await | ||
| .expect("failed to resolve"); | ||
| let connector = libsignal_net::infra::tcp_ssl::proxy::StatelessProxied; | ||
|
|
||
| const START_NEXT_DELAY: Duration = Duration::from_secs(5); | ||
| let connect_attempts = FuturesUnordered::from_iter(resolved.zip(0..).map(|(route, i)| { | ||
| let connector = &connector; | ||
| async move { | ||
| tokio::time::sleep(START_NEXT_DELAY * i).await; | ||
| log::info!("connecting via: {route:?}"); | ||
| connector.connect(route).await | ||
| } | ||
| })); | ||
| let mut connection = connect_attempts | ||
| .filter_map(|r| { | ||
| std::future::ready(match r { | ||
| Ok(c) => Some(c), | ||
| Err(e) => { | ||
| log::info!("connect failure: {e}"); | ||
| None | ||
| } | ||
| }) | ||
| }) | ||
| .next() | ||
| .await | ||
| .expect("failed to connect"); | ||
|
|
||
| eprintln!("connected to proxy, reading from stdin"); | ||
| let mut stdinout = tokio::io::join(tokio::io::stdin(), tokio::io::stdout()); | ||
|
|
||
| tokio::io::copy_bidirectional(&mut stdinout, &mut connection) | ||
| .await | ||
| .expect("proxying failed"); | ||
| } |
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