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// Copyright 2025-2026 Dillution <[email protected]>.
//
// This file is part of DPIBreak.
//
// DPIBreak is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation, either version 3 of the License, or (at your
// option) any later version.
//
// DPIBreak is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with DPIBreak. If not, see <https://www.gnu.org/licenses/>.
use anyhow::Result;
use windivert::{
WinDivert,
layer::NetworkLayer
};
use std::sync::{atomic::Ordering, LazyLock, Mutex, MutexGuard};
use crate::{log::LogLevel, log_println, splash};
use crate::opt;
fn windivert_filter() -> String {
let base = "(outbound and tcp and tcp.DstPort == 443 \
and tcp.Payload[0] == 22 \
and tcp.Payload[5] == 1)";
if crate::opt::fake_autottl() {
let synack = "(!outbound and tcp and tcp.SrcPort == 443 \
and tcp.Syn and tcp.Ack)";
format!("({base} or {synack}) and !impostor")
} else {
format!("{base} and !impostor")
}
}
pub static WINDIVERT_HANDLE: LazyLock<Mutex<WinDivert<NetworkLayer>>> = LazyLock::new(|| {
use windivert::*;
let filter = windivert_filter();
let h = match WinDivert::network(&filter, 0, prelude::WinDivertFlags::new()) {
Ok(h) => {
log_println!(LogLevel::Info, "windivert: HANDLE constructed for {}", filter);
h
},
Err(e) => {
log_println!(LogLevel::Error, "windivert: {}", e);
std::process::exit(1);
}
};
Mutex::new(h)
});
fn lock_handle() -> MutexGuard<'static, WinDivert<NetworkLayer>> {
WINDIVERT_HANDLE.lock().expect("mutex poisoned")
}
pub fn bootstrap() -> Result<()> {
if opt::daemonize() {
service_main();
}
Ok(())
}
pub fn cleanup() -> Result<()> {
// FIXME: `CloseAction::Uninstall' fail with `ERR_INVALID_NAME' here.
// (maybe crate windivert problem, which sending not-null-terminating
// "WinDivert" string to `OpenServiceA' with "WinDivert".as_ptr())
// So just closing the handle here instead.
//
// User might want to run `sc stop windivert' on administrator shell
// after terminating the dpibreak.
lock_handle().close(windivert::CloseAction::Nothing)?;
log_println!(LogLevel::Info, "windivert: HANDLE closed");
Ok(())
}
pub fn send_to_raw(pkt: &[u8]) -> Result<()> {
use windivert::*;
let mut p = unsafe { packet::WinDivertPacket::<NetworkLayer>::new(pkt.to_vec()) };
p.address.set_outbound(true);
p.address.set_ip_checksum(true); // TODO: test if this is needed
p.address.set_tcp_checksum(false); // For badsum; anyway it is already calculated
p.address.set_impostor(true); // to prevent inf loop
lock_handle().send(&p)?;
Ok(())
}
use crate::RUNNING;
pub fn run() -> Result<()> {
use crate::{handle_packet, MESSAGE_AT_RUN};
use super::PACKET_SIZE_CAP;
let mut windivert_buf = vec![0u8; 65536];
let mut buf = Vec::<u8>::with_capacity(PACKET_SIZE_CAP);
splash!("{MESSAGE_AT_RUN}");
while RUNNING.load(Ordering::SeqCst) {
let pkt = lock_handle().recv(Some(&mut windivert_buf))?;
handle_packet!(
&pkt.data,
&mut buf,
handled => {},
rejected => { lock_handle().send(&pkt)?; }
);
}
Ok(())
}
fn service_run() -> Result<()> {
let opt = opt::Opt::from_args()?;
opt.set_opt()?;
bootstrap()?;
run()?;
cleanup()?;
Ok(())
}
fn service_run_1() {
if service_main().is_err() {
std::process::exit(1);
}
std::process::exit(0);
}
fn service_main() {
use windows_services::Command;
match windows_services::Service::new()
.can_stop()
.run(|_, command| {
match command {
Command::Start => {
std::thread::spawn(|| service_main_1());
}
Command::Stop => {
RUNNING.store(false, Ordering::SeqCst);
}
_ => {}
}
}) {
Ok(_) => {}
Err(e) => {
println!("{e}");
std::process::exit(1);
}
};
}
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