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// Copyright © 2017 Mozilla Foundation
//
// This program is made available under an ISC-style license. See the
// accompanying file LICENSE for details
#![warn(unused_extern_crates)]
#![recursion_limit = "1024"]
#[macro_use]
extern crate error_chain;
#[macro_use]
extern crate log;
pub mod codec;
#[allow(deprecated)]
pub mod errors;
pub mod messages;
pub mod shm;
pub mod ipccore;
pub mod rpccore;
pub mod sys;
pub use crate::messages::{ClientMessage, ServerMessage};
#[cfg(unix)]
use std::os::unix::io::IntoRawFd;
#[cfg(windows)]
use std::os::windows::io::IntoRawHandle;
use std::io::Result;
// This must match the definition of
// ipc::FileDescriptor::PlatformHandleType in Gecko.
#[cfg(windows)]
pub type PlatformHandleType = std::os::windows::raw::HANDLE;
#[cfg(unix)]
pub type PlatformHandleType = libc::c_int;
// This stands in for RawFd/RawHandle.
#[derive(Debug)]
pub struct PlatformHandle(PlatformHandleType);
pub const INVALID_HANDLE_VALUE: PlatformHandleType = -1isize as PlatformHandleType;
#[cfg(unix)]
fn valid_handle(handle: PlatformHandleType) -> bool {
handle >= 0
}
#[cfg(windows)]
fn valid_handle(handle: PlatformHandleType) -> bool {
handle != INVALID_HANDLE_VALUE && !handle.is_null()
}
impl PlatformHandle {
pub fn new(raw: PlatformHandleType) -> PlatformHandle {
assert!(valid_handle(raw));
PlatformHandle(raw)
}
#[cfg(windows)]
pub fn from<T: IntoRawHandle>(from: T) -> PlatformHandle {
PlatformHandle::new(from.into_raw_handle())
}
#[cfg(unix)]
pub fn from<T: IntoRawFd>(from: T) -> PlatformHandle {
PlatformHandle::new(from.into_raw_fd())
}
#[allow(clippy::missing_safety_doc)]
pub unsafe fn into_raw(self) -> PlatformHandleType {
let handle = self.0;
std::mem::forget(self);
handle
}
#[cfg(unix)]
pub fn duplicate(h: PlatformHandleType) -> Result<PlatformHandle> {
unsafe {
let newfd = libc::dup(h);
if !valid_handle(newfd) {
return Err(std::io::Error::last_os_error());
}
Ok(PlatformHandle::from(newfd))
}
}
#[allow(clippy::missing_safety_doc)]
#[cfg(windows)]
pub unsafe fn duplicate(h: PlatformHandleType) -> Result<PlatformHandle> {
let dup = duplicate_platform_handle(h, None)?;
Ok(PlatformHandle::new(dup))
}
}
impl Drop for PlatformHandle {
fn drop(&mut self) {
unsafe { close_platform_handle(self.0) }
}
}
#[cfg(unix)]
unsafe fn close_platform_handle(handle: PlatformHandleType) {
libc::close(handle);
}
#[cfg(windows)]
use windows_sys::Win32::{
Foundation::{
CloseHandle, DuplicateHandle, DUPLICATE_CLOSE_SOURCE, DUPLICATE_SAME_ACCESS, FALSE,
S_FALSE, S_OK,
},
System::Com::{CoInitializeEx, COINIT_MULTITHREADED},
System::Threading::{GetCurrentProcess, OpenProcess, PROCESS_DUP_HANDLE},
};
#[cfg(windows)]
unsafe fn close_platform_handle(handle: PlatformHandleType) {
CloseHandle(handle as _);
}
// Duplicate `source_handle` to `target_pid`. Returns the value of the new handle inside the target process.
// If `target_pid` is `None`, `source_handle` is duplicated in the current process.
#[cfg(windows)]
pub(crate) unsafe fn duplicate_platform_handle(
source_handle: PlatformHandleType,
target_pid: Option<u32>,
) -> Result<PlatformHandleType> {
let source_process = GetCurrentProcess();
let target_process = if let Some(pid) = target_pid {
let target = OpenProcess(PROCESS_DUP_HANDLE, FALSE, pid);
if !valid_handle(target as _) {
return Err(std::io::Error::new(
std::io::ErrorKind::Other,
"invalid target process",
));
}
Some(target)
} else {
None
};
let mut target_handle = windows_sys::Win32::Foundation::INVALID_HANDLE_VALUE;
let ok = DuplicateHandle(
source_process,
source_handle as _,
target_process.unwrap_or(source_process),
&mut target_handle,
0,
FALSE,
DUPLICATE_SAME_ACCESS,
);
if let Some(target) = target_process {
CloseHandle(target);
};
if ok == FALSE {
return Err(std::io::Error::new(
std::io::ErrorKind::Other,
"DuplicateHandle failed",
));
}
Ok(target_handle as _)
}
// Close `target_handle_to_close` inside target process `target_pid` using a
// special invocation of `DuplicateHandle`. See
// https://docs.microsoft.com/en-us/windows/win32/api/handleapi/nf-handleapi-duplicatehandle#:~:text=Normally%20the%20target,dwOptions%20to%20DUPLICATE_CLOSE_SOURCE.
#[cfg(windows)]
pub(crate) unsafe fn close_target_handle(
target_handle_to_close: PlatformHandleType,
target_pid: u32,
) -> Result<()> {
let target_process = OpenProcess(PROCESS_DUP_HANDLE, FALSE, target_pid);
if !valid_handle(target_process as _) {
return Err(std::io::Error::new(
std::io::ErrorKind::Other,
"invalid target process",
));
}
let ok = DuplicateHandle(
target_process,
target_handle_to_close as _,
0,
std::ptr::null_mut(),
0,
FALSE,
DUPLICATE_CLOSE_SOURCE,
);
CloseHandle(target_process);
if ok == FALSE {
return Err(std::io::Error::new(
std::io::ErrorKind::Other,
"DuplicateHandle failed",
));
}
Ok(())
}
#[cfg(windows)]
pub fn server_platform_init() {
unsafe {
let r = CoInitializeEx(std::ptr::null_mut(), COINIT_MULTITHREADED as _);
assert!(r == S_OK || r == S_FALSE);
}
}
#[cfg(unix)]
pub fn server_platform_init() {}
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