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|
use std::{
ffi::{c_char, CStr},
io, mem,
};
use windows_sys::Win32::{
Foundation::{CloseHandle, ERROR_NO_MORE_FILES, HANDLE, INVALID_HANDLE_VALUE},
System::Diagnostics::ToolHelp::{
CreateToolhelp32Snapshot, Module32First, Module32Next, Process32FirstW, Process32NextW,
MODULEENTRY32, PROCESSENTRY32W,
},
};
/// A snapshot of process modules, threads, and heaps
pub struct ProcessSnapshot {
handle: HANDLE,
}
impl ProcessSnapshot {
/// Create a new process snapshot using `CreateToolhelp32Snapshot`
pub fn new(flags: u32, process_id: u32) -> io::Result<ProcessSnapshot> {
let snap = unsafe { CreateToolhelp32Snapshot(flags, process_id) };
if snap == INVALID_HANDLE_VALUE {
Err(io::Error::last_os_error())
} else {
Ok(ProcessSnapshot { handle: snap })
}
}
/// Return the raw handle
pub fn as_raw(&self) -> HANDLE {
self.handle
}
/// Return an iterator over the modules in the snapshot
pub fn modules(&self) -> ProcessSnapshotModules<'_> {
let mut entry: MODULEENTRY32 = unsafe { mem::zeroed() };
entry.dwSize = mem::size_of::<MODULEENTRY32>() as u32;
ProcessSnapshotModules {
snapshot: self,
iter_started: false,
temp_entry: entry,
}
}
/// Return an iterator over the processes in the snapshot
pub fn processes(&self) -> ProcessSnapshotEntries<'_> {
let mut entry: PROCESSENTRY32W = unsafe { mem::zeroed() };
entry.dwSize = mem::size_of::<PROCESSENTRY32W>() as u32;
ProcessSnapshotEntries {
snapshot: self,
iter_started: false,
temp_entry: entry,
}
}
}
impl Drop for ProcessSnapshot {
fn drop(&mut self) {
unsafe {
CloseHandle(self.handle);
}
}
}
/// Description of a snapshot module entry. See `MODULEENTRY32`
pub struct ModuleEntry {
/// Module name
pub name: String,
/// Module base address (in the owning process)
pub base_address: *const u8,
/// Size of the module (in bytes)
pub size: usize,
}
/// Module iterator for [ProcessSnapshot]
pub struct ProcessSnapshotModules<'a> {
snapshot: &'a ProcessSnapshot,
iter_started: bool,
temp_entry: MODULEENTRY32,
}
impl Iterator for ProcessSnapshotModules<'_> {
type Item = io::Result<ModuleEntry>;
fn next(&mut self) -> Option<io::Result<ModuleEntry>> {
if self.iter_started {
if unsafe { Module32Next(self.snapshot.as_raw(), &mut self.temp_entry) } == 0 {
let last_error = io::Error::last_os_error();
return if last_error.raw_os_error().unwrap() as u32 == ERROR_NO_MORE_FILES {
None
} else {
Some(Err(last_error))
};
}
} else {
if unsafe { Module32First(self.snapshot.as_raw(), &mut self.temp_entry) } == 0 {
return Some(Err(io::Error::last_os_error()));
}
self.iter_started = true;
}
let cstr_ref = &self.temp_entry.szModule[0];
let cstr = unsafe { CStr::from_ptr(cstr_ref as *const u8 as *const c_char) };
Some(Ok(ModuleEntry {
name: cstr.to_string_lossy().into_owned(),
base_address: self.temp_entry.modBaseAddr,
size: self.temp_entry.modBaseSize as usize,
}))
}
}
/// Description of a snapshot process entry. See `PROCESSENTRY32W`
pub struct ProcessEntry {
/// Process identifier
pub pid: u32,
/// Process identifier of the parent process
pub parent_pid: u32,
}
/// Process iterator for [ProcessSnapshot]
pub struct ProcessSnapshotEntries<'a> {
snapshot: &'a ProcessSnapshot,
iter_started: bool,
temp_entry: PROCESSENTRY32W,
}
impl Iterator for ProcessSnapshotEntries<'_> {
type Item = io::Result<ProcessEntry>;
fn next(&mut self) -> Option<io::Result<ProcessEntry>> {
if self.iter_started {
if unsafe { Process32NextW(self.snapshot.as_raw(), &mut self.temp_entry) } == 0 {
let last_error = io::Error::last_os_error();
return if last_error.raw_os_error().unwrap() as u32 == ERROR_NO_MORE_FILES {
None
} else {
Some(Err(last_error))
};
}
} else {
if unsafe { Process32FirstW(self.snapshot.as_raw(), &mut self.temp_entry) } == 0 {
return Some(Err(io::Error::last_os_error()));
}
self.iter_started = true;
}
Some(Ok(ProcessEntry {
pid: self.temp_entry.th32ProcessID,
parent_pid: self.temp_entry.th32ParentProcessID,
}))
}
}
|
