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mod.rs
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mod.rs
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use winapi::um::processthreadsapi::{OpenProcess, OpenThread, GetThreadId, SuspendThread, ResumeThread};
use winapi::um::winnt::{ACCESS_MASK, MAXIMUM_ALLOWED, PROCESS_QUERY_INFORMATION,
PROCESS_VM_READ, PROCESS_SUSPEND_RESUME, THREAD_QUERY_INFORMATION, THREAD_GET_CONTEXT, THREAD_ALL_ACCESS,
WCHAR, HANDLE};
use winapi::shared::minwindef::{FALSE, DWORD, MAX_PATH, ULONG};
use winapi::shared::ntdef::PUNICODE_STRING;
use winapi::um::handleapi::{CloseHandle};
use winapi::um::winbase::QueryFullProcessImageNameW;
use winapi::um::winnt::OSVERSIONINFOEXW;
use std::ffi::OsString;
use std::os::windows::ffi::{OsStringExt};
use winapi::shared::ntdef::{PVOID, NTSTATUS, USHORT, VOID, NULL};
pub use read_process_memory::{Pid, ProcessHandle, CopyAddress};
pub type Tid = Pid;
use super::Error;
mod unwinder;
mod symbolication;
mod syscalls_x64;
use self::syscalls_x64::{Syscall, lookup_syscall};
pub use self::unwinder::Unwinder;
pub use self::symbolication::Symbolicator;
pub struct Process {
pub pid: Pid,
pub handle: ProcessHandle
}
#[link(name="ntdll")]
extern "system" {
// using these undocumented api's seems to be the best way to suspend/resume a process
// on windows (using the toolhelp32snapshot api to get threads doesn't seem practical tbh)
// https://j00ru.vexillium.org/2009/08/suspending-processes-in-windows/
fn RtlNtStatusToDosError(status: NTSTATUS) -> ULONG;
fn NtSuspendProcess(process: HANDLE) -> NTSTATUS;
fn NtResumeProcess(process: HANDLE) -> NTSTATUS;
// using GetVersion/GetVersionEx from processthreadsapi returns incorrect information after win 8.1,
// unless we provide a application manifest file, which is currently not fully supported w/ rust
// https://github.com/rust-lang/rfcs/issues/721
// https://stackoverflow.com/questions/17399302/how-can-i-detect-windows-8-1-in-a-desktop-application
// hack around this by using RtlGetVersion instead
fn RtlGetVersion(lpVersionInformation: &mut OSVERSIONINFOEXW) -> NTSTATUS;
fn NtQueryInformationThread(thread: HANDLE, info_class: u32, info: PVOID, info_len: ULONG, ret_len: * mut ULONG) -> NTSTATUS;
fn NtQueryInformationProcess(process: HANDLE, info_class: u32, info: PVOID, info_len: ULONG, ret_len: * mut ULONG) -> NTSTATUS;
fn NtGetNextThread(process: HANDLE, thread: HANDLE, access: ACCESS_MASK, attritubes: ULONG, flags: ULONG, new_thread: *mut HANDLE) -> NTSTATUS;
}
impl Process {
pub fn new(pid: Pid) -> Result<Process, Error> {
// we can't just use try_into_prcess_handle here because we need some additional permissions
unsafe {
let handle = OpenProcess(PROCESS_VM_READ | PROCESS_SUSPEND_RESUME | PROCESS_QUERY_INFORMATION
| THREAD_QUERY_INFORMATION | THREAD_GET_CONTEXT, FALSE, pid);
if handle == (0 as std::os::windows::io::RawHandle) {
return Err(Error::from(std::io::Error::last_os_error()));
}
Ok(Process{pid, handle: ProcessHandle(handle)})
}
}
pub fn handle(&self) -> ProcessHandle { self.handle }
pub fn exe(&self) -> Result<String, Error> {
unsafe {
let mut size = MAX_PATH as DWORD;
let mut filename: [WCHAR; MAX_PATH] = std::mem::zeroed();
let ret = QueryFullProcessImageNameW(self.handle.0, 0, filename.as_mut_ptr(), &mut size);
if ret == 0 {
return Err(std::io::Error::last_os_error().into());
}
Ok(OsString::from_wide(&filename[0..size as usize]).to_string_lossy().into_owned())
}
}
pub fn lock(&self) -> Result<Lock, Error> {
Ok(Lock::new(self.handle)?)
}
pub fn cwd(&self) -> Result<String, Error> {
// TODO: get the CWD.
// seems a little involved: http://wj32.org/wp/2009/01/24/howto-get-the-command-line-of-processes/
// steps:
// 1) NtQueryInformationProcess to get PebBaseAddress, which ProcessParameters
// is at some constant offset (+10 on 32 bit etc)
// 2) ReadProcessMemory to get RTL_USER_PROCESS_PARAMETERS struct
// 3) get CWD from the struct (has UNICODE_DATA object with ptr + length to CWD)
unimplemented!("cwd is unimplemented on windows")
}
pub fn cmdline(&self) -> Result<Vec<String>, Error> {
unsafe {
// figure how much storage we need to allocate for cmdline.
let mut size: ULONG = 0;
NtQueryInformationProcess(self.handle.0, 60, std::ptr::null_mut(), 0, &size as *const _ as *mut _);
if size == 0 {
// the above call always fails (with an error like 'The program issued a command but the
// command length is incorrect.'). It should set the size to how many chars we need to allocate
// . If the size is still 0 though, default to some decently sized number
size = 65536;
}
// Get the commandline
let storage = vec![0_u16; size as usize];
let ret = NtQueryInformationProcess(self.handle.0, 60,
(&storage as &[u16]) as * const _ as * mut _,
size, &size as *const _ as *mut _);
if ret != 0 {
return Err(Error::from(std::io::Error::from_raw_os_error(RtlNtStatusToDosError(ret) as i32)));
}
let unicode: PUNICODE_STRING = (&storage as &[u16]) as * const _ as * mut _;
let chars = std::slice::from_raw_parts((*unicode).Buffer, (*unicode).Length as usize);
let mut ret = Vec::new();
ret.push(String::from_utf16_lossy(chars));
Ok(ret)
}
}
pub fn threads(&self) -> Result<Vec<Thread>, Error> {
let mut ret = Vec::new();
unsafe {
let mut thread: HANDLE = std::mem::zeroed();
while NtGetNextThread(self.handle.0, thread, MAXIMUM_ALLOWED, 0, 0,
&mut thread as *mut HANDLE) == 0 {
ret.push(Thread{ thread: ProcessHandle(thread) });
}
}
Ok(ret)
}
pub fn unwinder(&self) -> Result<unwinder::Unwinder, Error> {
unwinder::Unwinder::new(self.handle.0)
}
pub fn symbolicator(&self) -> Result<Symbolicator, Error> {
Symbolicator::new(self.handle.0)
}
}
impl Drop for Process {
fn drop(&mut self) {
unsafe { CloseHandle(self.handle.0); }
}
}
impl super::ProcessMemory for Process {
fn read(&self, addr: usize, buf: &mut [u8]) -> Result<(), Error> {
Ok(self.handle.copy_address(addr, buf)?)
}
}
#[derive(Eq, PartialEq, Hash, Clone)]
pub struct Thread {
thread: ProcessHandle,
}
impl Thread {
pub fn new(tid: Tid) -> Result<Thread, Error> {
// we can't just use try_into_prcess_handle here because we need some additional permissions
unsafe {
let thread = OpenThread(THREAD_ALL_ACCESS, FALSE, tid);
if thread == (0 as std::os::windows::io::RawHandle) {
return Err(Error::from(std::io::Error::last_os_error()));
}
Ok(Thread { thread: ProcessHandle(thread) })
}
}
pub fn lock(&self) -> Result<ThreadLock, Error> {
ThreadLock::new(self.thread)
}
pub fn id(&self) -> Result<Tid, Error> {
unsafe { Ok(GetThreadId(self.thread.0)) }
}
pub fn active(&self) -> Result<bool, Error> {
// Getting whether a thread is active or not is suprisingly difficult on windows
// we're getting the syscall the thread is doing here, and then checking against a list
// of known waiting syscalls to get this
unsafe {
let mut data = std::mem::zeroed::<THREAD_LAST_SYSCALL_INFORMATION>();
let ret = NtQueryInformationThread(self.thread.0, 21,
&mut data as *mut _ as *mut VOID,
std::mem::size_of::<THREAD_LAST_SYSCALL_INFORMATION>() as u32,
NULL as *mut u32);
// if we're not in a syscall, we're active
if ret != 0 {
return Ok(true);
}
// Get the major/minor/build version of the current windows systems
let mut os_info = std::mem::zeroed::<OSVERSIONINFOEXW>();
os_info.dwOSVersionInfoSize = std::mem::size_of::<OSVERSIONINFOEXW>() as DWORD;
if RtlGetVersion(&mut os_info) != 0 {
return Err(Error::from(std::io::Error::from_raw_os_error(RtlNtStatusToDosError(ret) as i32)));
}
// TODO: blocked IO comes up as active here too (like prompt_toolkit\eventloop\inputhook.py)
// should we also check the IO Pending flag? Or add NTReadFile as 'idle' ?
// resolve the syscallnumber, and check if the thread is waiting
let active = match lookup_syscall(os_info.dwMajorVersion,
os_info.dwMinorVersion,
os_info.dwBuildNumber,
data.syscall_number.into()) {
Some(Syscall::NtWaitForAlertByThreadId) => false,
Some(Syscall::NtWaitForDebugEvent) => false,
Some(Syscall::NtWaitForKeyedEvent) => false,
Some(Syscall::NtWaitForMultipleObjects) => false,
Some(Syscall::NtWaitForMultipleObjects32) => false,
Some(Syscall::NtWaitForSingleObject) => false,
Some(Syscall::NtWaitForWnfNotifications) => false,
Some(Syscall::NtWaitForWorkViaWorkerFactory) => false,
Some(Syscall::NtWaitHighEventPair) => false,
Some(Syscall::NtWaitLowEventPair) => false,
_ => true
};
Ok(active)
}
}
}
impl Drop for Thread {
fn drop(&mut self) {
unsafe { CloseHandle(self.thread.0); }
}
}
pub struct Lock {
process: ProcessHandle
}
impl Lock {
pub fn new(process: ProcessHandle) -> Result<Lock, Error> {
unsafe {
let ret = NtSuspendProcess(process.0);
if ret != 0 {
return Err(Error::from(std::io::Error::from_raw_os_error(RtlNtStatusToDosError(ret) as i32)));
}
}
Ok(Lock{process})
}
}
impl Drop for Lock {
fn drop(&mut self) {
unsafe {
let ret = NtResumeProcess(self.process.0);
if ret != 0 {
panic!("Failed to resume process: {}",
std::io::Error::from_raw_os_error(RtlNtStatusToDosError(ret) as i32));
}
}
}
}
pub struct ThreadLock {
thread: ProcessHandle
}
impl ThreadLock {
pub fn new(thread: ProcessHandle) -> Result<ThreadLock, Error> {
unsafe {
let ret = SuspendThread(thread.0);
if ret.wrapping_add(1) == 0 {
return Err(std::io::Error::last_os_error().into());
}
Ok(ThreadLock{thread})
}
}
}
impl Drop for ThreadLock {
fn drop(&mut self) {
unsafe {
if ResumeThread(self.thread.0).wrapping_add(1) == 0 {
panic!("Failed to resume thread {}", std::io::Error::last_os_error());
}
}
}
}
#[repr(C)]
#[derive(Copy, Clone, Debug)]
struct THREAD_LAST_SYSCALL_INFORMATION {
arg1: PVOID,
syscall_number: USHORT
}