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|
mod blocking;
use std::{
ffi::{c_void, CString},
marker::PhantomData,
mem::MaybeUninit,
};
use crate::layer;
use crate::prelude::*;
use sys::{WinDivertParam, WinDivertShutdownMode};
use windivert_sys as sys;
use windows::{
core::{Error as WinError, Result as WinResult, PCSTR},
Win32::{
Foundation::{GetLastError, HANDLE},
System::{
Services::{
CloseServiceHandle, ControlService, OpenSCManagerA, OpenServiceA,
SC_MANAGER_ALL_ACCESS, SERVICE_CONTROL_STOP, SERVICE_STATUS,
},
Threading::{CreateEventA, TlsAlloc, TlsGetValue, TlsSetValue},
},
},
};
/// Main wrapper struct around windivert functionalities.
#[non_exhaustive]
pub struct WinDivert<L: layer::WinDivertLayerTrait> {
handle: HANDLE,
_tls_idx: u32,
_layer: PhantomData<L>,
}
/// Recv implementations
impl<L: layer::WinDivertLayerTrait> WinDivert<L> {
/// Open a handle using the specified parameters.
fn new(
filter: &str,
layer: WinDivertLayer,
priority: i16,
flags: WinDivertFlags,
) -> Result<Self, WinDivertError> {
let filter = CString::new(filter)?;
let windivert_tls_idx = unsafe { TlsAlloc() };
let handle = unsafe { sys::WinDivertOpen(filter.as_ptr(), layer, priority, flags) };
if handle.is_invalid() {
let open_err = WinDivertOpenError::try_from(std::io::Error::last_os_error())?;
Err(open_err.into())
} else {
Ok(Self {
handle,
_tls_idx: windivert_tls_idx,
_layer: PhantomData::<L>,
})
}
}
pub(crate) fn _get_event(tls_idx: u32) -> Result<HANDLE, WinDivertError> {
let mut event = HANDLE::default();
unsafe {
event.0 = TlsGetValue(tls_idx) as isize;
if event.is_invalid() {
event = CreateEventA(None, false, false, None)?;
TlsSetValue(tls_idx, Some(event.0 as *mut c_void));
}
}
Ok(event)
}
/// Methods that allows to query the driver for parameters.
pub fn get_param(&self, param: WinDivertParam) -> Result<u64, WinDivertError> {
let mut value = 0;
let res = unsafe { sys::WinDivertGetParam(self.handle, param, &mut value) };
if !res.as_bool() {
return Err(std::io::Error::last_os_error().into());
}
Ok(value)
}
/// Method that allows setting driver parameters.
pub fn set_param(&self, param: WinDivertParam, value: u64) -> Result<(), WinDivertError> {
match param {
WinDivertParam::VersionMajor | WinDivertParam::VersionMinor => {
Err(WinDivertError::Parameter(param, value))
}
_ => unsafe { sys::WinDivertSetParam(self.handle, param, value) }
.ok()
.map_err(|_| std::io::Error::last_os_error().into()),
}
}
/// Handle close function.
pub fn close(&mut self, action: CloseAction) -> WinResult<()> {
let res = unsafe { sys::WinDivertClose(self.handle) };
if !res.as_bool() {
return Err(WinError::from(unsafe { GetLastError() }));
}
match action {
CloseAction::Uninstall => WinDivert::uninstall(),
CloseAction::Nothing => Ok(()),
}
}
/// Shutdown function.
pub fn shutdown(&self, mode: WinDivertShutdownMode) -> WinResult<()> {
let res = unsafe { sys::WinDivertShutdown(self.handle, mode) };
if !res.as_bool() {
return Err(WinError::from(unsafe { GetLastError() }));
}
Ok(())
}
}
impl WinDivert<layer::NetworkLayer> {
/// WinDivert constructor for network layer.
pub fn network(
filter: impl AsRef<str>,
priority: i16,
flags: WinDivertFlags,
) -> Result<Self, WinDivertError> {
Self::new(filter.as_ref(), WinDivertLayer::Network, priority, flags)
}
}
impl WinDivert<layer::ForwardLayer> {
/// WinDivert constructor for forward layer.
pub fn forward(
filter: impl AsRef<str>,
priority: i16,
flags: WinDivertFlags,
) -> Result<Self, WinDivertError> {
Self::new(filter.as_ref(), WinDivertLayer::Forward, priority, flags)
}
}
impl WinDivert<layer::FlowLayer> {
/// WinDivert constructor for flow layer.
pub fn flow(
filter: &str,
priority: i16,
flags: WinDivertFlags,
) -> Result<Self, WinDivertError> {
Self::new(
filter,
WinDivertLayer::Flow,
priority,
flags.set_recv_only().set_sniff(),
)
}
}
impl WinDivert<layer::SocketLayer> {
/// WinDivert constructor for socket layer.
pub fn socket(
filter: impl AsRef<str>,
priority: i16,
flags: WinDivertFlags,
) -> Result<Self, WinDivertError> {
Self::new(
filter.as_ref(),
WinDivertLayer::Socket,
priority,
flags.set_recv_only(),
)
}
}
impl WinDivert<layer::ReflectLayer> {
/// WinDivert constructor for reflect layer.
pub fn reflect(
filter: impl AsRef<str>,
priority: i16,
flags: WinDivertFlags,
) -> Result<Self, WinDivertError> {
Self::new(
filter.as_ref(),
WinDivertLayer::Reflect,
priority,
flags.set_recv_only().set_sniff(),
)
}
}
impl WinDivert<()> {
/// Maximum number of packets that can be captured/sent in a single batched operation
pub const MAX_BATCH: u8 = windivert_sys::WINDIVERT_BATCH_MAX as u8;
/// Method that tries to uninstall WinDivert driver.
pub fn uninstall() -> WinResult<()> {
let mut status = MaybeUninit::<SERVICE_STATUS>::uninit();
unsafe {
let manager = OpenSCManagerA(None, None, SC_MANAGER_ALL_ACCESS)?;
let service = OpenServiceA(
manager,
PCSTR::from_raw(c"WinDivert".as_ptr() as *const u8),
SC_MANAGER_ALL_ACCESS,
)?;
let res = ControlService(service, SERVICE_CONTROL_STOP, status.as_mut_ptr());
if !res.as_bool() {
return Err(WinError::from(GetLastError()));
}
let res = CloseServiceHandle(service);
if !res.as_bool() {
return Err(WinError::from(GetLastError()));
}
let res = CloseServiceHandle(manager);
if !res.as_bool() {
return Err(WinError::from(GetLastError()));
}
}
Ok(())
}
}
/// Action parameter for [`WinDivert::close()`](`fn@WinDivert::close`)
pub enum CloseAction {
/// Close the handle and try to uninstall the WinDivert driver.
Uninstall,
/// Close the handle without uninstalling the driver.
Nothing,
}
impl Default for CloseAction {
fn default() -> Self {
Self::Nothing
}
}
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