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use windivert_sys::{ChecksumFlags, WinDivertHelperCalcChecksums};
use crate::{address::WinDivertAddress, layer, prelude::WinDivertError};
use std::{
borrow::{BorrowMut, Cow},
ffi::c_void,
fmt::Debug,
};
/// Raw captured packet
#[derive(Debug, Clone)]
pub struct WinDivertPacket<'a, L: layer::WinDivertLayerTrait> {
/// Address data
pub address: WinDivertAddress<L>,
/// Raw captured data
pub data: Cow<'a, [u8]>,
}
impl<'a> WinDivertPacket<'a, layer::NetworkLayer> {
/// Create a new network packet from a raw buffer
/// # Safety
/// `address` is zeroed, user must fill it with correct data before sending.
pub unsafe fn new(data: Vec<u8>) -> Self {
Self {
address: WinDivertAddress::<layer::NetworkLayer>::new(),
data: Cow::from(data),
}
}
/// Recalculate the checksums of the packet
/// This is a noop if the packet is not owned.
pub fn recalculate_checksums(&mut self, flags: ChecksumFlags) -> Result<(), WinDivertError> {
if let Cow::Owned(ref mut data) = self.data.borrow_mut() {
let res = unsafe {
WinDivertHelperCalcChecksums(
data.as_mut_ptr() as *mut c_void,
data.len() as u32,
self.address.as_mut(),
flags,
)
};
if !res.as_bool() {
return Err(WinDivertError::from(windows::core::Error::from_win32()));
}
}
Ok(())
}
}
impl<'a> WinDivertPacket<'a, layer::ForwardLayer> {
/// Create a new network forward packet from a raw buffer
/// # Safety
/// `address` is zeroed, user must fill it with correct data before sending.
pub unsafe fn new(data: Vec<u8>) -> Self {
Self {
address: WinDivertAddress::<layer::ForwardLayer>::new(),
data: Cow::from(data),
}
}
/// Recalculate the checksums of the packet
/// This is a noop if the packet is not owned.
pub fn recalculate_checksums(&mut self, flags: ChecksumFlags) -> Result<(), WinDivertError> {
if let Cow::Owned(ref mut data) = self.data.borrow_mut() {
let res = unsafe {
WinDivertHelperCalcChecksums(
data.as_mut_ptr() as *mut c_void,
data.len() as u32,
self.address.as_mut(),
flags,
)
};
if !res.as_bool() {
return Err(WinDivertError::from(windows::core::Error::from_win32()));
}
}
Ok(())
}
}
impl<'a, L: layer::WinDivertLayerTrait> WinDivertPacket<'a, L> {
/// Create an owned packet from a borrowed packet
pub fn into_owned(self) -> WinDivertPacket<'static, L> {
WinDivertPacket {
address: self.address,
data: self.data.into_owned().into(),
}
}
}
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