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use std::{
ffi::{c_char, c_void},
ptr::null_mut,
slice,
};
use mullvad_types::access_method::{
AccessMethod, AccessMethodSetting,
BuiltInAccessMethod::{Bridge, Direct, EncryptedDnsProxy},
Id, Settings,
};
use talpid_types::net::proxy::{self, Shadowsocks, Socks5Remote};
use crate::get_string;
/// Converts parameters into a `Box<AccessMethodSetting>` raw representation that
/// can be passed across the FFI boundary
///
/// # SAFETY:
/// `unique_identifier` and `name` must point to valid memory regions and contain NULL terminators.
/// They are only valid for the duration of this call.
///
/// `proxy_configuration` can be NULL, or must be a pointer gotten through
/// either the `convert_shadowsocks` or `convert_socks5` methods.
#[unsafe(no_mangle)]
unsafe extern "C" fn convert_builtin_access_method_setting(
unique_identifier: *const c_char,
name: *const c_char,
is_enabled: bool,
method_kind: SwiftAccessMethodKind,
proxy_configuration: *const c_void,
) -> *mut c_void {
match convert_builtin_access_method_setting_inner(
unique_identifier,
name,
is_enabled,
method_kind,
proxy_configuration,
) {
Some(access_method) => Box::into_raw(Box::new(access_method)) as *mut c_void,
None => null_mut(),
}
}
/// Converts parameters into an `AccessMethodSetting`
///
/// This function copies the strings from the conversion of the variables
/// `unique_identifier`, `name`, and takes ownership of `proxy_configuration`
fn convert_builtin_access_method_setting_inner(
unique_identifier: *const c_char,
name: *const c_char,
enabled: bool,
method_kind: SwiftAccessMethodKind,
proxy_configuration: *const c_void,
) -> Option<AccessMethodSetting> {
// SAFETY: See `convert_builtin_access_method_setting`
let id = unsafe { Id::from_string(get_string(unique_identifier))? };
// SAFETY: See `convert_builtin_access_method_setting`
let name = unsafe { get_string(name) };
match method_kind {
SwiftAccessMethodKind::KindDirect => Some(AccessMethodSetting::with_id(
id,
name,
enabled,
AccessMethod::BuiltIn(Direct),
)),
SwiftAccessMethodKind::KindBridge => Some(AccessMethodSetting::with_id(
id,
name,
enabled,
AccessMethod::BuiltIn(Bridge),
)),
SwiftAccessMethodKind::KindEncryptedDnsProxy => Some(AccessMethodSetting::with_id(
id,
name,
enabled,
AccessMethod::BuiltIn(EncryptedDnsProxy),
)),
SwiftAccessMethodKind::KindShadowsocks => match proxy_configuration.is_null() {
true => None,
false => {
// SAFETY: See `convert_builtin_access_method_setting`
let configuration: Shadowsocks =
unsafe { *Box::from_raw(proxy_configuration as *mut _) };
Some(AccessMethodSetting::with_id(
id,
name,
enabled,
AccessMethod::Custom(proxy::CustomProxy::Shadowsocks(configuration)),
))
}
},
SwiftAccessMethodKind::KindSocks5Local => match proxy_configuration.is_null() {
true => None,
false => {
// SAFETY: See `convert_builtin_access_method_setting`
let configuration: Socks5Remote =
unsafe { *Box::from_raw(proxy_configuration as *mut _) };
Some(AccessMethodSetting::with_id(
id,
name,
enabled,
AccessMethod::Custom(proxy::CustomProxy::Socks5Remote(configuration)),
))
}
},
}
}
/// Used by Swift to instruct which access method kind it is trying to convert
#[allow(dead_code)]
#[repr(u8)]
pub enum SwiftAccessMethodKind {
KindDirect = 0,
KindBridge,
KindEncryptedDnsProxy,
KindShadowsocks,
KindSocks5Local,
}
/// Creates a wrapper around a `Settings` object that can be safely sent across the FFI boundary.
///
/// # SAFETY
/// `direct_method_raw`, `bridges_method_raw` and `encrypted_dns_method_raw` must be raw pointers
/// resulting from a call to `convert_builtin_access_method_setting`
/// `custom_methods_raw` is an array of pointers to instances of `AccessMethodSetting`
#[unsafe(no_mangle)]
pub unsafe extern "C" fn init_access_method_settings_wrapper(
direct_method_raw: *const c_void,
bridges_method_raw: *const c_void,
encrypted_dns_method_raw: *const c_void,
custom_methods_raw: *const c_void,
custom_method_count: usize,
) -> SwiftAccessMethodSettingsWrapper {
// SAFETY: See `init_access_method_settings_wrapper`
let (direct, mullvad_bridges, encrypted_dns_proxy) = unsafe {
(
*Box::from_raw(direct_method_raw as *mut _),
*Box::from_raw(bridges_method_raw as *mut _),
*Box::from_raw(encrypted_dns_method_raw as *mut _),
)
};
let custom = unsafe { access_methods_from_raw_array(custom_methods_raw, custom_method_count) };
let settings = Settings::new(direct, mullvad_bridges, encrypted_dns_proxy, custom);
let context = SwiftAccessMethodSettingsContext { settings };
SwiftAccessMethodSettingsWrapper::new(context)
}
/// Creates a vector of `AccessMethodSetting` objects from a C array
///
/// SAFETY: `raw_array` must be aligned, non-null and initialized for `count` reads
unsafe fn access_methods_from_raw_array(
raw_array: *const c_void,
number_of_elements: usize,
) -> Vec<AccessMethodSetting> {
let raw_array: *mut *mut AccessMethodSetting = raw_array as _;
// SAFETY: See notice above
let slice = unsafe { slice::from_raw_parts(raw_array, number_of_elements) };
slice
.iter()
.map(|&ptr| {
// SAFETY: `slice` is a slice of pointers to `AccessMethodSetting` created with `Box::into_raw`
*unsafe { Box::from_raw(ptr) }
})
.collect()
}
#[repr(C)]
pub struct SwiftAccessMethodSettingsWrapper(*mut SwiftAccessMethodSettingsContext);
impl SwiftAccessMethodSettingsWrapper {
pub fn new(context: SwiftAccessMethodSettingsContext) -> SwiftAccessMethodSettingsWrapper {
SwiftAccessMethodSettingsWrapper(Box::into_raw(Box::new(context)))
}
pub unsafe fn into_rust_context(self) -> Box<SwiftAccessMethodSettingsContext> {
unsafe { Box::from_raw(self.0) }
}
}
#[derive(Debug)]
pub struct SwiftAccessMethodSettingsContext {
pub settings: Settings,
}
impl SwiftAccessMethodSettingsContext {
pub fn convert_access_method(&self) -> Option<Settings> {
Some(self.settings.clone())
}
}
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