85 lines
2.7 KiB
Rust
85 lines
2.7 KiB
Rust
//! Helpers for terminal interaction
|
|
|
|
use std::io::{Read, Write};
|
|
use std::os::unix::io::AsRawFd;
|
|
|
|
use failure::*;
|
|
|
|
use crate::try_block;
|
|
|
|
/// Returns whether the current stdin is a tty .
|
|
pub fn stdin_isatty() -> bool {
|
|
unsafe { libc::isatty(std::io::stdin().as_raw_fd()) == 1 }
|
|
}
|
|
|
|
/// Read a password from stdin, masking the echoed output with asterisks and writing a query first.
|
|
pub fn read_password(query: &str) -> Result<Vec<u8>, Error> {
|
|
let input = std::io::stdin();
|
|
if unsafe { libc::isatty(input.as_raw_fd()) } != 1 {
|
|
let mut out = String::new();
|
|
input.read_line(&mut out)?;
|
|
return Ok(out.into_bytes());
|
|
}
|
|
|
|
let mut out = std::io::stdout();
|
|
let _ignore_error = out.write_all(query.as_bytes());
|
|
let _ignore_error = out.flush();
|
|
|
|
let infd = input.as_raw_fd();
|
|
let mut termios: libc::termios = unsafe { std::mem::uninitialized() };
|
|
if unsafe { libc::tcgetattr(infd, &mut termios) } != 0 {
|
|
bail!("tcgetattr() failed");
|
|
}
|
|
let old_termios = termios.clone();
|
|
unsafe {
|
|
libc::cfmakeraw(&mut termios);
|
|
}
|
|
if unsafe { libc::tcsetattr(infd, libc::TCSANOW, &termios) } != 0 {
|
|
bail!("tcsetattr() failed");
|
|
}
|
|
|
|
let mut password = Vec::<u8>::new();
|
|
let mut asterisks = true;
|
|
|
|
let ok: Result<(), Error> = try_block!({
|
|
for byte in input.bytes() {
|
|
let byte = byte?;
|
|
match byte {
|
|
3 => bail!("cancelled"), // ^C
|
|
4 => break, // ^D / EOF
|
|
9 => asterisks = false, // tab disables echo
|
|
0xA | 0xD => { // newline, we're done
|
|
let _ignore_error = out.write_all("\r\n".as_bytes());
|
|
let _ignore_error = out.flush();
|
|
break;
|
|
}
|
|
0x7F => { // backspace
|
|
if password.len() > 0{
|
|
password.pop();
|
|
if asterisks {
|
|
let _ignore_error = out.write_all("\x08 \x08".as_bytes());
|
|
let _ignore_error = out.flush();
|
|
}
|
|
}
|
|
}
|
|
other => {
|
|
password.push(other);
|
|
if asterisks {
|
|
let _ignore_error = out.write_all("*".as_bytes());
|
|
let _ignore_error = out.flush();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Ok(())
|
|
});
|
|
if unsafe { libc::tcsetattr(infd, libc::TCSANOW, &old_termios) } != 0 {
|
|
// not fatal...
|
|
eprintln!("failed to reset terminal attributes!");
|
|
}
|
|
match ok {
|
|
Ok(_) => Ok(password),
|
|
Err(e) => Err(e),
|
|
}
|
|
}
|