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-rw-r--r--toolkit/components/processtools/src/lib.rs177
1 files changed, 177 insertions, 0 deletions
diff --git a/toolkit/components/processtools/src/lib.rs b/toolkit/components/processtools/src/lib.rs
new file mode 100644
index 0000000000..a84aa9ef62
--- /dev/null
+++ b/toolkit/components/processtools/src/lib.rs
@@ -0,0 +1,177 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#[cfg(not(target_os = "windows"))]
+extern crate libc;
+#[cfg(target_os = "windows")]
+extern crate winapi;
+
+extern crate nserror;
+extern crate xpcom;
+
+use std::convert::TryInto;
+
+use nserror::{nsresult, NS_ERROR_FAILURE, NS_OK};
+use xpcom::{interfaces::nsIProcessToolsService, xpcom, xpcom_method, RefPtr};
+
+// Separate this `use` to avoid build-breaking warnings.
+#[cfg(target_os = "windows")]
+use nserror::NS_ERROR_NOT_AVAILABLE;
+
+#[no_mangle]
+pub unsafe extern "C" fn new_process_tools_service(result: *mut *const nsIProcessToolsService) {
+ let service: RefPtr<ProcessToolsService> = ProcessToolsService::new();
+ RefPtr::new(service.coerce::<nsIProcessToolsService>()).forget(&mut *result);
+}
+
+#[cfg(target_os = "windows")]
+use std::ffi::c_void;
+
+// We want to generate an exception that can be caught by the exception handler
+// when injecting in a remote process, STATUS_ACCESS_VIOLATION seems not to do,
+// it but the following code generates a STATUS_ILLEGAL_INSTRUCTION that seems
+// to do the trick
+#[cfg(target_os = "windows")]
+pub unsafe extern "system" fn crash_illegal_instruction(_arg: *mut c_void) -> u32 {
+ std::ptr::null_mut::<u32>().write(1);
+ 0
+}
+
+// Implementation note:
+//
+// We're following the strategy employed by the `kvstore`.
+// See https://searchfox.org/mozilla-central/rev/a87a1c3b543475276e6d57a7a80cb02f3e42b6ed/toolkit/components/kvstore/src/lib.rs#78
+
+#[xpcom(implement(nsIProcessToolsService), atomic)]
+pub struct ProcessToolsService {}
+
+impl ProcessToolsService {
+ pub fn new() -> RefPtr<ProcessToolsService> {
+ ProcessToolsService::allocate(InitProcessToolsService {})
+ }
+
+ // Method `kill`.
+
+ xpcom_method!(
+ kill => Kill(id: u64)
+ );
+
+ #[cfg(target_os = "windows")]
+ pub fn kill(&self, pid: u64) -> Result<(), nsresult> {
+ let handle = unsafe {
+ winapi::um::processthreadsapi::OpenProcess(
+ /* dwDesiredAccess */
+ winapi::um::winnt::PROCESS_TERMINATE | winapi::um::winnt::SYNCHRONIZE,
+ /* bInheritHandle */ 0,
+ /* dwProcessId */ pid.try_into().unwrap(),
+ )
+ };
+ if handle.is_null() {
+ // Could not open process.
+ return Err(NS_ERROR_NOT_AVAILABLE);
+ }
+
+ let result = unsafe {
+ winapi::um::processthreadsapi::TerminateProcess(
+ /* hProcess */ handle, /* uExitCode */ 0,
+ )
+ };
+
+ // Close handle regardless of success.
+ let _ = unsafe { winapi::um::handleapi::CloseHandle(handle) };
+
+ if result == 0 {
+ return Err(NS_ERROR_FAILURE);
+ }
+ Ok(())
+ }
+
+ #[cfg(not(target_os = "windows"))]
+ pub fn kill(&self, pid: u64) -> Result<(), nsresult> {
+ let pid = pid.try_into().or(Err(NS_ERROR_FAILURE))?;
+ let result = unsafe { libc::kill(pid, libc::SIGKILL) };
+ if result == 0 {
+ Ok(())
+ } else {
+ Err(NS_ERROR_FAILURE)
+ }
+ }
+
+ // Method `crash`
+
+ xpcom_method!(
+ crash => Crash(id: u64)
+ );
+
+ #[cfg(target_os = "windows")]
+ pub fn crash(&self, pid: u64) -> Result<(), nsresult> {
+ let target_proc = unsafe {
+ winapi::um::processthreadsapi::OpenProcess(
+ /* dwDesiredAccess */
+ winapi::um::winnt::PROCESS_VM_OPERATION
+ | winapi::um::winnt::PROCESS_CREATE_THREAD
+ | winapi::um::winnt::PROCESS_QUERY_INFORMATION,
+ /* bInheritHandle */ 0,
+ /* dwProcessId */ pid.try_into().unwrap(),
+ )
+ };
+ if target_proc.is_null() {
+ // Could not open process.
+ return Err(NS_ERROR_NOT_AVAILABLE);
+ }
+
+ let new_thread = unsafe {
+ winapi::um::processthreadsapi::CreateRemoteThread(
+ /* hProcess */ target_proc,
+ /* lpThreadAttributes */ std::ptr::null_mut(),
+ /* dwStackSize */ 0,
+ /* lpStartAddress */ Some(crash_illegal_instruction),
+ /* lpParameter */ std::ptr::null_mut(),
+ /* dwCreationFlags */ 0,
+ /* lpThreadId */ std::ptr::null_mut(),
+ )
+ };
+
+ // Close handle regardless of success.
+ let _ = unsafe {
+ winapi::um::synchapi::WaitForSingleObject(new_thread, winapi::um::winbase::INFINITE);
+ winapi::um::handleapi::CloseHandle(new_thread);
+ winapi::um::handleapi::CloseHandle(target_proc);
+ };
+
+ if new_thread.is_null() {
+ return Err(NS_ERROR_FAILURE);
+ }
+ Ok(())
+ }
+
+ #[cfg(not(target_os = "windows"))]
+ pub fn crash(&self, pid: u64) -> Result<(), nsresult> {
+ let pid = pid.try_into().or(Err(NS_ERROR_FAILURE))?;
+ let result = unsafe { libc::kill(pid, libc::SIGABRT) };
+ if result == 0 {
+ Ok(())
+ } else {
+ Err(NS_ERROR_FAILURE)
+ }
+ }
+
+ // Attribute `pid`
+
+ xpcom_method!(
+ get_pid => GetPid() -> u64
+ );
+
+ #[cfg(not(target_os = "windows"))]
+ pub fn get_pid(&self) -> Result<u64, nsresult> {
+ let pid = unsafe { libc::getpid() } as u64;
+ Ok(pid)
+ }
+
+ #[cfg(target_os = "windows")]
+ pub fn get_pid(&self) -> Result<u64, nsresult> {
+ let pid = unsafe { winapi::um::processthreadsapi::GetCurrentProcessId() } as u64;
+ Ok(pid)
+ }
+}