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use crate::VpnClient;
use lazy_static::lazy_static;
use openconnect_sys::{OC_CMD_CANCEL, OC_CMD_DETACH, OC_CMD_PAUSE, OC_CMD_STATS};
use std::sync::{atomic::Ordering, Mutex, Weak};
#[derive(Debug, Clone, Copy)]
pub enum Command {
Cancel,
Detach,
Pause,
Stats,
}
impl From<Command> for u8 {
fn from(cmd: Command) -> u8 {
match cmd {
Command::Cancel => OC_CMD_CANCEL,
Command::Detach => OC_CMD_DETACH,
Command::Pause => OC_CMD_PAUSE,
Command::Stats => OC_CMD_STATS,
}
}
}
pub trait CmdPipe {
fn set_sock_block(&self, cmd_fd: i32);
fn send_command(&self, cmd: Command);
}
impl CmdPipe for VpnClient {
fn set_sock_block(&self, cmd_fd: i32) {
#[cfg(not(target_os = "windows"))]
{
unsafe {
libc::fcntl(
cmd_fd,
libc::F_SETFL,
libc::fcntl(cmd_fd, libc::F_GETFL) & !libc::O_NONBLOCK,
);
}
}
#[cfg(target_os = "windows")]
{
let mut mode: u32 = 0;
unsafe {
windows_sys::Win32::Networking::WinSock::ioctlsocket(
cmd_fd as usize,
windows_sys::Win32::Networking::WinSock::FIONBIO,
&mut mode,
);
}
}
}
fn send_command(&self, cmd: Command) {
let cmd: u8 = cmd.into();
#[cfg(not(target_os = "windows"))]
{
let cmd_fd = self.cmd_fd.load(Ordering::SeqCst);
if cmd != 0 && cmd_fd >= 0 {
let ret = unsafe { libc::write(cmd_fd, std::ptr::from_ref(&cmd) as *const _, 1) };
if ret < 0 {
// TODO: log error
}
}
}
#[cfg(target_os = "windows")]
{
let cmd_fd = self.cmd_fd.load(Ordering::SeqCst);
if cmd_fd >= 0 {
let ret = {
unsafe {
windows_sys::Win32::Networking::WinSock::send(
cmd_fd as usize,
std::ptr::from_ref(&cmd) as *const _,
1,
0,
)
}
};
if ret < 0 {
// TODO: log error
}
}
}
}
}
pub struct SignalHandle {
client: Mutex<Weak<VpnClient>>,
}
lazy_static! {
pub static ref SIGNAL_HANDLE: SignalHandle = {
let sig_handle = SignalHandle {
client: Mutex::new(Weak::new()),
};
sig_handle.set_sig_handler();
sig_handle
};
}
impl SignalHandle {
/// Set the current client singleton to the given client.
/// This is used when signal handler is called to send command to the client.
pub fn update_client_singleton(&self, client: Weak<VpnClient>) {
let saved_client = self.client.lock();
if let Ok(mut saved_client) = saved_client {
*saved_client = client;
}
}
/// Set the signal handler for the current process.
fn set_sig_handler(&self) {
#[cfg(not(target_os = "windows"))]
{
use signal_hook::{
consts::{SIGHUP, SIGINT, SIGTERM, SIGUSR1, SIGUSR2},
iterator::Signals,
};
let mut signals = Signals::new([SIGINT, SIGTERM, SIGHUP, SIGUSR1, SIGUSR2])
.expect("Failed to register signal handler");
std::thread::spawn(move || {
for sig in signals.forever() {
let cmd = match sig {
SIGINT | SIGTERM => {
println!("Received SIGINT or SIGTERM");
Command::Cancel
}
SIGHUP => {
println!("Received SIGHUP");
Command::Detach
}
SIGUSR2 => {
println!("Received SIGUSR2");
Command::Pause
}
SIGUSR1 => {
println!("Received SIGUSR1");
Command::Stats
}
_ => {
println!("Received unknown signal");
unreachable!()
}
};
{
let this = SIGNAL_HANDLE
.client
.lock()
.ok()
.and_then(|this| this.upgrade());
if let Some(this) = this {
this.send_command(cmd);
}
}
if sig == SIGINT || sig == SIGTERM {
// Exit the signal handler thread since the process is going to exit
break;
}
}
});
}
#[cfg(target_os = "windows")]
{
use windows_sys::Win32::System::Console::{
SetConsoleCtrlHandler, CTRL_BREAK_EVENT, CTRL_CLOSE_EVENT, CTRL_C_EVENT,
CTRL_LOGOFF_EVENT, CTRL_SHUTDOWN_EVENT,
};
unsafe extern "system" fn console_control_handle(dw_ctrl_type: u32) -> i32 {
let cmd = match dw_ctrl_type {
CTRL_C_EVENT | CTRL_CLOSE_EVENT | CTRL_LOGOFF_EVENT | CTRL_SHUTDOWN_EVENT => {
Command::Cancel
}
CTRL_BREAK_EVENT => Command::Detach,
_ => unreachable!(),
};
{
let this = SIGNAL_HANDLE
.client
.lock()
.ok()
.and_then(|this| this.upgrade());
if let Some(this) = this {
this.send_command(cmd);
}
}
1
}
unsafe {
SetConsoleCtrlHandler(Some(console_control_handle), 1);
}
}
}
}