import tor package

packages/tor/rust/Cargo.lock.license

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+SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+
+SPDX-License-Identifier: MIT

packages/tor/rust/Cargo.toml

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+# SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+#
+# SPDX-License-Identifier: MIT
+
+[package]
+name = "tor"
+version = "0.0.9"
+authors = ["Igor Cota <igor@foundation.xyz>"]
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "staticlib"]
+
+[dependencies]
+lazy_static = "1.5"
+tokio = { version = "1", features = ["full"] }
+arti-client = { version = "0.34.0", features = ["static", "onion-service-client"] }
+arti = { version = "1.5.0", features = ["experimental-api", "static"] }
+tor-rtcompat = { version = "0.34.0", features = ["static"] }
+tor-config = "0.34.0"
+log = "0.4.28"
+#android_log-sys = "0.3.1"
+rlimit = "0.10.2"
+anyhow = "1.0.99"
+time = "0.3.43"
+
+[build-dependencies]
+cbindgen = "=0.24.3"

packages/tor/rust/build.rs

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+// SPDX-FileCopyrightText: 2023 Foundation Devices Inc.
+// SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+//
+// SPDX-License-Identifier: MIT
+
+use cbindgen::{Config, Language};
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    // Create C header files for Dart
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+    let package_name = env::var("CARGO_PKG_NAME").unwrap();
+
+    let output_file = target_dir()
+        .join(format!("{}.h", package_name))
+        .display()
+        .to_string();
+
+    let config = Config {
+        language: Language::C,
+        ..Default::default()
+    };
+
+    cbindgen::generate_with_config(crate_dir, config)
+        .unwrap()
+        .write_to_file(output_file);
+}
+
+fn target_dir() -> PathBuf {
+    if let Ok(target) = env::var("CARGO_TARGET_DIR") {
+        PathBuf::from(target)
+    } else {
+        PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()).join("target")
+    }
+}

packages/tor/rust/rust-toolchain

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+# SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+#
+# SPDX-License-Identifier: MIT
+
+[toolchain]
+channel = "1.87.0"

packages/tor/rust/rust-toolchain.license

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+SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+
+SPDX-License-Identifier: MIT

packages/tor/rust/src/error.rs

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+// SPDX-FileCopyrightText: 2023 Foundation Devices Inc.
+// SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+//
+// SPDX-License-Identifier: MIT
+
+use log::{error, warn};
+use std::cell::RefCell;
+use std::error::Error;
+use std::ffi::{c_char, CString};
+//pub(crate) use crate::unwrap_or_return;
+
+thread_local! {
+    static LAST_ERROR: RefCell<Option<Box<dyn Error>>> = RefCell::new(None);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tor_last_error_message() -> *const c_char {
+    let last_error = match crate::error::take_last_error() {
+        Some(err) => err,
+        None => return CString::new("").unwrap().into_raw(),
+    };
+
+    let error_message = last_error.to_string();
+    CString::new(error_message).unwrap().into_raw()
+}
+
+macro_rules! unwrap_or_return {
+    ($a:expr,$b:expr) => {
+        match $a {
+            Ok(x) => x,
+            Err(e) => {
+                update_last_error(e);
+                return $b;
+            }
+        }
+    };
+}
+
+/// Update the most recent error, clearing whatever may have been there before.
+pub fn update_last_error<E: Error + 'static>(err: E) {
+    error!("Setting LAST_ERROR: {}", err);
+
+    {
+        // Print a pseudo-backtrace for this error, following back each error's
+        // cause until we reach the root error.
+        let mut cause = err.source();
+        while let Some(parent_err) = cause {
+            warn!("Caused by: {}", parent_err);
+            cause = parent_err.source();
+        }
+    }
+
+    LAST_ERROR.with(|prev| {
+        *prev.borrow_mut() = Some(Box::new(err));
+    });
+}
+
+/// Retrieve the most recent error, clearing it in the process.
+pub fn take_last_error() -> Option<Box<dyn Error>> {
+    LAST_ERROR.with(|prev| prev.borrow_mut().take())
+}

packages/tor/rust/src/lib.rs

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+// SPDX-FileCopyrightText: 2023 Foundation Devices Inc.
+// SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+//
+// SPDX-License-Identifier: MIT
+
+use crate::error::update_last_error;
+use arti::socks;
+use arti_client::config::pt::TransportConfigBuilder;
+use arti_client::config::CfgPath;
+use arti_client::{DormantMode, TorClient, TorClientConfig};
+use lazy_static::lazy_static;
+use std::ffi::{c_char, c_void, CStr};
+use std::net::SocketAddr;
+use std::{io, ptr};
+use tokio::runtime::{Builder, Runtime};
+use tokio::task::JoinHandle;
+use tor_config::Listen;
+use tor_rtcompat::tokio::TokioNativeTlsRuntime;
+use tor_rtcompat::ToplevelBlockOn;
+
+pub use crate::error::tor_last_error_message;
+#[cfg(not(target_os = "windows"))]
+pub use crate::util::tor_get_nofile_limit;
+#[cfg(not(target_os = "windows"))]
+pub use crate::util::tor_set_nofile_limit;
+
+#[macro_use]
+mod error;
+mod util;
+
+lazy_static! {
+    static ref RUNTIME: io::Result<Runtime> = Builder::new_multi_thread().enable_all().build();
+}
+
+#[repr(C)]
+pub struct Tor {
+    client: *mut c_void,
+    proxy: *mut c_void,
+}
+
+struct TorConfig {
+    state_dir: String,
+    cache_dir: String,
+    obfs4_port: u16,
+    snowflake_port: u16,
+    bridge_lines: Option<String>,
+}
+
+fn build_tor_client_config(
+    config: &TorConfig,
+) -> Result<TorClientConfig, tor_config::ConfigBuildError> {
+    let mut cfg_builder = TorClientConfig::builder();
+
+    cfg_builder
+        .storage()
+        .state_dir(CfgPath::new(config.state_dir.clone()))
+        .cache_dir(CfgPath::new(config.cache_dir.clone()));
+    cfg_builder.address_filter().allow_onion_addrs(true);
+
+    if config.obfs4_port > 0 {
+        let mut transport = TransportConfigBuilder::default();
+        transport
+            .protocols(vec!["obfs4".parse().unwrap()])
+            .proxy_addr(SocketAddr::new(
+                "127.0.0.1".parse().unwrap(),
+                config.obfs4_port,
+            ));
+        cfg_builder.bridges().transports().push(transport);
+    }
+
+    if config.snowflake_port > 0 {
+        let mut transport = TransportConfigBuilder::default();
+        transport
+            .protocols(vec!["snowflake".parse().unwrap()])
+            .proxy_addr(SocketAddr::new(
+                "127.0.0.1".parse().unwrap(),
+                config.snowflake_port,
+            ));
+        cfg_builder.bridges().transports().push(transport);
+    }
+
+    if let Some(ref bridge_lines) = config.bridge_lines {
+        for bridge_line in bridge_lines.split('\n') {
+            match bridge_line.parse() {
+                Ok(bridge) => {
+                    cfg_builder.bridges().bridges().push(bridge);
+                }
+                Err(e) => {
+                    eprintln!("Failed to parse bridge line '{}': {}", bridge_line, e);
+                }
+            }
+        }
+    }
+
+    cfg_builder.build()
+}
+
+unsafe fn parse_config_from_c_params(
+    state_dir: *const c_char,
+    cache_dir: *const c_char,
+    obfs4_port: u16,
+    snowflake_port: u16,
+    bridge_lines: *const c_char,
+) -> Result<TorConfig, std::str::Utf8Error> {
+    let state_dir = CStr::from_ptr(state_dir).to_str()?.to_owned();
+    let cache_dir = CStr::from_ptr(cache_dir).to_str()?.to_owned();
+
+    let bridge_lines = if bridge_lines.is_null() {
+        None
+    } else {
+        Some(CStr::from_ptr(bridge_lines).to_str()?.to_owned())
+    };
+
+    Ok(TorConfig {
+        state_dir,
+        cache_dir,
+        obfs4_port,
+        snowflake_port,
+        bridge_lines,
+    })
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tor_start(
+    socks_port: u16,
+    state_dir: *const c_char,
+    cache_dir: *const c_char,
+    obfs4_port: u16,
+    snowflake_port: u16,
+    bridge_lines: *const c_char,
+) -> Tor {
+    let err_ret = Tor {
+        client: ptr::null_mut(),
+        proxy: ptr::null_mut(),
+    };
+
+    let config = unwrap_or_return!(
+        parse_config_from_c_params(
+            state_dir,
+            cache_dir,
+            obfs4_port,
+            snowflake_port,
+            bridge_lines
+        ),
+        err_ret
+    );
+
+    let runtime = unwrap_or_return!(TokioNativeTlsRuntime::create(), err_ret);
+    let cfg = unwrap_or_return!(build_tor_client_config(&config), err_ret);
+
+    let client = unwrap_or_return!(
+        runtime.block_on(async {
+            TorClient::with_runtime(runtime.clone())
+                .config(cfg)
+                .create_bootstrapped()
+                .await
+        }),
+        err_ret
+    );
+
+    let proxy_handle_box = Box::new(start_proxy(socks_port, client.clone()));
+    let client_box = Box::new(client.clone());
+
+    Tor {
+        client: Box::into_raw(client_box) as *mut c_void,
+        proxy: Box::into_raw(proxy_handle_box) as *mut c_void,
+    }
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tor_reconfigure(
+    client: *mut c_void,
+    state_dir: *const c_char,
+    cache_dir: *const c_char,
+    obfs4_port: u16,
+    snowflake_port: u16,
+    bridge_lines: *const c_char,
+) -> bool {
+    let config = unwrap_or_return!(
+        parse_config_from_c_params(
+            state_dir,
+            cache_dir,
+            obfs4_port,
+            snowflake_port,
+            bridge_lines
+        ),
+        false
+    );
+
+    let cfg = unwrap_or_return!(build_tor_client_config(&config), false);
+
+    let client = {
+        assert!(!client.is_null());
+        Box::from_raw(client as *mut TorClient<TokioNativeTlsRuntime>)
+    };
+
+    unwrap_or_return!(
+        TorClient::reconfigure(&client, &cfg, tor_config::Reconfigure::WarnOnFailures),
+        false
+    );
+
+    Box::leak(client);
+    true
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tor_client_bootstrap(client: *mut c_void) -> bool {
+    let client = {
+        assert!(!client.is_null());
+        Box::from_raw(client as *mut TorClient<TokioNativeTlsRuntime>)
+    };
+
+    unwrap_or_return!(client.runtime().block_on(client.bootstrap()), false);
+    true
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tor_client_set_dormant(client: *mut c_void, soft_mode: bool) {
+    let client = {
+        assert!(!client.is_null());
+        Box::from_raw(client as *mut TorClient<TokioNativeTlsRuntime>)
+    };
+
+    let dormant_mode = if soft_mode {
+        DormantMode::Soft
+    } else {
+        DormantMode::Normal
+    };
+    client.set_dormant(dormant_mode);
+    Box::leak(client);
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tor_proxy_stop(proxy: *mut c_void) {
+    let proxy = {
+        assert!(!proxy.is_null());
+        Box::from_raw(proxy as *mut JoinHandle<anyhow::Result<()>>)
+    };
+
+    proxy.abort();
+}
+
+fn start_proxy(
+    port: u16,
+    client: TorClient<TokioNativeTlsRuntime>,
+) -> JoinHandle<anyhow::Result<()>> {
+    println!("Starting proxy!");
+    let rt = RUNTIME.as_ref().unwrap();
+    rt.spawn(socks::run_socks_proxy(
+        client.runtime().clone(),
+        client.clone(),
+        Listen::new_localhost(port),
+        None,
+    ))
+}
+
+#[no_mangle]
+pub unsafe extern "C" fn tor_hello() {
+    println!("HELLO THERE");
+}

packages/tor/rust/src/util.rs

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+// SPDX-FileCopyrightText: 2024 Foundation Devices Inc.
+//
+// SPDX-License-Identifier: MIT
+
+use crate::error::update_last_error;
+
+#[no_mangle]
+#[cfg(not(target_os = "windows"))]
+pub unsafe extern "C" fn tor_get_nofile_limit() -> u64 {
+    let nofile_limit = unwrap_or_return!(rlimit::getrlimit(rlimit::Resource::NOFILE), 0);
+    nofile_limit.0
+}
+
+#[no_mangle]
+#[cfg(not(target_os = "windows"))]
+pub unsafe extern "C" fn tor_set_nofile_limit(limit: u64) -> u64 {
+    unwrap_or_return!(rlimit::increase_nofile_limit(limit), 0)
+}

packages/tor/rust/target/tor.h

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+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef struct Tor {
+  void *client;
+  void *proxy;
+} Tor;
+
+struct Tor tor_start(uint16_t socks_port,
+                     const char *state_dir,
+                     const char *cache_dir,
+                     uint16_t obfs4_port,
+                     uint16_t snowflake_port,
+                     const char *bridge_lines);
+
+bool tor_reconfigure(void *client,
+                     const char *state_dir,
+                     const char *cache_dir,
+                     uint16_t obfs4_port,
+                     uint16_t snowflake_port,
+                     const char *bridge_lines);
+
+bool tor_client_bootstrap(void *client);
+
+void tor_client_set_dormant(void *client, bool soft_mode);
+
+void tor_proxy_stop(void *proxy);
+
+void tor_hello(void);
+
+const char *tor_last_error_message(void);
+
+uint64_t tor_get_nofile_limit(void);
+
+uint64_t tor_set_nofile_limit(uint64_t limit);