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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,192 @@ | ||
| use std::ffi::c_int; | ||
| use std::fs::File; | ||
| use std::io::{stderr, stdin, stdout, Read, Write}; | ||
| use std::mem::MaybeUninit; | ||
| use std::os::fd::{AsFd, AsRawFd, OwnedFd, RawFd}; | ||
| use std::process::exit; | ||
| use std::ptr::null_mut; | ||
| use std::thread; | ||
|
|
||
| use anyhow::{bail, Ok, Result}; | ||
| use libc::{ | ||
| __errno, fork, pthread_sigmask, sigaddset, sigemptyset, sigset_t, sigwait, waitpid, winsize, | ||
| EINTR, SIGWINCH, SIG_BLOCK, SIG_UNBLOCK, TIOCGWINSZ, TIOCSWINSZ, | ||
| }; | ||
| use rustix::fs::{open, Mode, OFlags}; | ||
| use rustix::io::dup; | ||
| use rustix::ioctl::{ioctl, Getter, ReadOpcode}; | ||
| use rustix::process::setsid; | ||
| use rustix::pty::{grantpt, unlockpt}; | ||
| use rustix::stdio::{dup2_stderr, dup2_stdin, dup2_stdout}; | ||
| use rustix::termios::{isatty, tcgetattr, tcsetattr, OptionalActions, Termios}; | ||
|
|
||
| use crate::defs::PTS_NAME; | ||
| use crate::utils::get_tmp_path; | ||
|
|
||
| // https://github.com/topjohnwu/Magisk/blob/5627053b7481618adfdf8fa3569b48275589915b/native/src/core/su/pts.cpp | ||
|
|
||
| fn get_pty_num<F: AsFd>(fd: F) -> Result<u32> { | ||
| Ok(unsafe { | ||
| let tiocgptn = Getter::<ReadOpcode<b'T', 0x30, u32>, u32>::new(); | ||
| ioctl(fd, tiocgptn)? | ||
| }) | ||
| } | ||
|
|
||
| static mut OLD_STDIN: Option<Termios> = None; | ||
|
|
||
| fn watch_sigwinch_async(slave: RawFd) { | ||
| let mut winch = MaybeUninit::<sigset_t>::uninit(); | ||
| unsafe { | ||
| sigemptyset(winch.as_mut_ptr()); | ||
| sigaddset(winch.as_mut_ptr(), SIGWINCH); | ||
| pthread_sigmask(SIG_BLOCK, winch.as_mut_ptr(), null_mut()); | ||
| } | ||
|
|
||
| thread::spawn(move || unsafe { | ||
| let mut winch = MaybeUninit::<sigset_t>::uninit(); | ||
| sigemptyset(winch.as_mut_ptr()); | ||
| sigaddset(winch.as_mut_ptr(), SIGWINCH); | ||
| pthread_sigmask(SIG_UNBLOCK, winch.as_mut_ptr(), null_mut()); | ||
| let mut sig: c_int = 0; | ||
| loop { | ||
| let mut w = MaybeUninit::<winsize>::uninit(); | ||
| if libc::ioctl(1, TIOCGWINSZ, w.as_mut_ptr()) < 0 { | ||
| continue; | ||
| } | ||
| libc::ioctl(slave, TIOCSWINSZ, w.as_mut_ptr()); | ||
| if sigwait(winch.as_mut_ptr(), &mut sig) != 0 { | ||
| break; | ||
| } | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| fn set_stdin_raw() { | ||
| let mut termios = match tcgetattr(stdin()) { | ||
| Result::Ok(termios) => { | ||
| unsafe { | ||
| OLD_STDIN = Some(termios.clone()); | ||
| } | ||
| termios | ||
| } | ||
| Err(_) => return, | ||
| }; | ||
|
|
||
| termios.make_raw(); | ||
|
|
||
| if tcsetattr(stdin(), OptionalActions::Flush, &termios).is_err() { | ||
| let _ = tcsetattr(stdin(), OptionalActions::Drain, &termios); | ||
| } | ||
| } | ||
|
|
||
| fn restore_stdin() { | ||
| let Some(termios) = (unsafe { OLD_STDIN.take() }) else { | ||
| return; | ||
| }; | ||
|
|
||
| if tcsetattr(stdin(), OptionalActions::Flush, &termios).is_err() { | ||
| let _ = tcsetattr(stdin(), OptionalActions::Drain, &termios); | ||
| } | ||
| } | ||
|
|
||
| fn pump<R: Read, W: Write>(mut from: R, mut to: W) { | ||
| let mut buf = [0u8; 4096]; | ||
| loop { | ||
| match from.read(&mut buf) { | ||
| Result::Ok(len) => { | ||
| if len == 0 { | ||
| return; | ||
| } | ||
| if to.write_all(&buf[0..len]).is_err() { | ||
| return; | ||
| } | ||
| if to.flush().is_err() { | ||
| return; | ||
| } | ||
| } | ||
| Err(_) => { | ||
| return; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| fn pump_stdin_async(mut ptmx: File) { | ||
| set_stdin_raw(); | ||
|
|
||
| thread::spawn(move || { | ||
| let mut stdin = stdin(); | ||
| pump(&mut stdin, &mut ptmx); | ||
| }); | ||
| } | ||
|
|
||
| fn pump_stdout_blocking(mut ptmx: File) { | ||
| let mut stdout = stdout(); | ||
| pump(&mut ptmx, &mut stdout); | ||
|
|
||
| restore_stdin(); | ||
| } | ||
|
|
||
| fn create_transfer(ptmx: OwnedFd) -> Result<()> { | ||
| let pid = unsafe { fork() }; | ||
| match pid { | ||
| d if d < 0 => bail!("fork"), | ||
| 0 => return Ok(()), | ||
| _ => {} | ||
| } | ||
|
|
||
| let ptmx_r = ptmx; | ||
| let ptmx_w = dup(&ptmx_r).unwrap(); | ||
|
|
||
| let ptmx_r = File::from(ptmx_r); | ||
| let ptmx_w = File::from(ptmx_w); | ||
|
|
||
| watch_sigwinch_async(ptmx_w.as_raw_fd()); | ||
| pump_stdin_async(ptmx_r); | ||
| pump_stdout_blocking(ptmx_w); | ||
|
|
||
| let mut status: c_int = -1; | ||
|
|
||
| unsafe { | ||
| loop { | ||
| if waitpid(pid, &mut status, 0) == -1 && *__errno() != EINTR { | ||
| continue; | ||
| } | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| exit(status) | ||
| } | ||
|
|
||
| pub fn prepare_pty() -> Result<()> { | ||
| let tty_in = isatty(stdin()); | ||
| let tty_out = isatty(stdout()); | ||
| let tty_err = isatty(stderr()); | ||
| if !tty_in && !tty_out && !tty_err { | ||
| return Ok(()); | ||
| } | ||
|
|
||
| let mut pts_path = format!("{}/{}", get_tmp_path(), PTS_NAME); | ||
| if !std::path::Path::new(&pts_path).exists() { | ||
| pts_path = "/dev/pts".to_string(); | ||
| } | ||
| let ptmx_path = format!("{}/ptmx", pts_path); | ||
| let ptmx_fd = open(ptmx_path, OFlags::RDWR, Mode::empty())?; | ||
| grantpt(&ptmx_fd)?; | ||
| unlockpt(&ptmx_fd)?; | ||
| let pty_num = get_pty_num(&ptmx_fd)?; | ||
| create_transfer(ptmx_fd)?; | ||
| setsid()?; | ||
| let pty_fd = open(format!("{pts_path}/{pty_num}"), OFlags::RDWR, Mode::empty())?; | ||
| if tty_in { | ||
| dup2_stdin(&pty_fd)?; | ||
| } | ||
| if tty_out { | ||
| dup2_stdout(&pty_fd)?; | ||
| } | ||
| if tty_err { | ||
| dup2_stderr(&pty_fd)?; | ||
| } | ||
| Ok(()) | ||
| } |
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