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