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use std::io::Write;
#[cfg(not(windows))]
mod unix {
extern crate termios;
extern crate libc;
use self::libc::STDIN_FILENO;
use self::libc::isatty;
use std::io::{ Error, ErrorKind };
use std::io::Result as IoResult;
use std::ptr;
#[cfg(not(test))]
use std::io::{stdin, Stdin};
#[cfg(test)]
use std::fs::File;
#[cfg(test)]
use std::io::{BufRead, BufReader};
trait MutableByteVector {
fn set_memory(&mut self, value: u8);
}
impl MutableByteVector for Vec<u8> {
#[inline]
fn set_memory(&mut self, value: u8) {
unsafe { ptr::write_bytes(self.as_mut_ptr(), value, self.len()) };
}
}
#[cfg(test)]
static mut TEST_EOF: bool = false;
#[cfg(test)]
static mut TEST_HAS_SEEN_EOF_BUFFER: bool = false;
#[cfg(test)]
static mut TEST_HAS_SEEN_REGULAR_BUFFER: bool = false;
#[cfg(test)]
fn get_reader<'a>() -> BufReader<File> {
if unsafe { TEST_EOF } {
unsafe { TEST_HAS_SEEN_EOF_BUFFER = true; }
BufReader::new(File::open("/dev/null").unwrap())
} else {
unsafe { TEST_HAS_SEEN_REGULAR_BUFFER = true; }
BufReader::new(File::open("tests/password").unwrap())
}
}
#[cfg(not(test))]
fn get_reader() -> Stdin {
stdin()
}
pub fn read_password() -> IoResult<String> {
read_input(true)
}
pub fn read_response() -> IoResult<String> {
read_input(false)
}
fn read_input(hide: bool) -> IoResult<String> {
let mut password = String::new();
let input_is_piped = unsafe { isatty(0) } == 0;
if input_is_piped {
get_reader().read_line(&mut password)?;
} else {
let mut term = termios::Termios::from_fd(STDIN_FILENO)?;
let term_orig = term;
if hide {
term.c_lflag &= !termios::ECHO;
}
term.c_lflag |= termios::ECHONL;
termios::tcsetattr(STDIN_FILENO, termios::TCSANOW, &term)?;
match get_reader().read_line(&mut password) {
Ok(_) => { },
Err(err) => {
termios::tcsetattr(STDIN_FILENO, termios::TCSANOW, &term_orig)?;
return Err(err);
}
};
match termios::tcsetattr(STDIN_FILENO, termios::TCSANOW, &term_orig) {
Ok(_) => {},
Err(err) => {
unsafe { password.as_mut_vec() }.set_memory(0);
return Err(err);
}
}
}
match password.pop() {
Some(_) => {},
None => { return Err(Error::new(ErrorKind::UnexpectedEof, "unexpected end of file")) }
};
Ok(password)
}
#[test]
fn it_works() {
let term_before = termios::Termios::from_fd(STDIN_FILENO).unwrap();
assert_eq!(read_password().unwrap(), "my-secret");
let term_after = termios::Termios::from_fd(STDIN_FILENO).unwrap();
assert_eq!(term_before, term_after);
unsafe { TEST_EOF = true; }
assert!(!read_password().is_ok());
let term_after = termios::Termios::from_fd(STDIN_FILENO).unwrap();
assert_eq!(term_before, term_after);
assert!(unsafe { TEST_HAS_SEEN_REGULAR_BUFFER });
assert!(unsafe { TEST_HAS_SEEN_EOF_BUFFER });
}
}
#[cfg(windows)]
mod windows {
extern crate winapi;
extern crate kernel32;
use std::io::{ Error, ErrorKind };
use std::io::Result as IoResult;
use std::ptr::null_mut;
pub fn read_password() -> IoResult<String> {
read_input(true)
}
pub fn read_response() -> IoResult<String> {
read_input(false)
}
fn read_input(hide: bool) -> IoResult<String> {
let handle = unsafe { kernel32::GetStdHandle(winapi::STD_INPUT_HANDLE) };
if handle == winapi::INVALID_HANDLE_VALUE {
return Err(Error::last_os_error())
}
let mut mode = 0;
if unsafe { kernel32::GetConsoleMode(handle, &mut mode as winapi::LPDWORD) } == 0 {
return Err(Error::last_os_error())
}
let new_mode_flags = match hide {
true => winapi::ENABLE_LINE_INPUT | winapi::ENABLE_PROCESSED_INPUT,
false => winapi::ENABLE_LINE_INPUT | winapi::ENABLE_PROCESSED_INPUT | winapi::ENABLE_ECHO_INPUT,
};
if unsafe { kernel32::SetConsoleMode(handle, new_mode_flags) } == 0 {
return Err(Error::last_os_error())
}
let mut buf: [winapi::WCHAR; 0x1000] = [0; 0x1000];
let mut read = 0;
if unsafe { kernel32::ReadConsoleW(
handle, buf.as_mut_ptr() as winapi::LPVOID, 0x1000,
&mut read, null_mut(),
) } == 0 {
let err = Error::last_os_error();
unsafe { kernel32::SetConsoleMode(handle, mode) };
return Err(err)
}
if unsafe { kernel32::SetConsoleMode(handle, mode) } == 0 {
return Err(Error::last_os_error())
}
println!("");
match String::from_utf16(&buf[..read as usize - 2]) {
Ok(s) => Ok(s),
Err(_) => Err(Error::new(ErrorKind::InvalidInput, "invalid UTF-16")),
}
}
}
#[cfg(not(windows))]
pub use unix::read_response;
#[cfg(windows)]
pub use windows::read_response;
#[cfg(not(windows))]
pub use unix::read_password;
#[cfg(windows)]
pub use windows::read_password;
pub fn prompt_response_stdout(prompt: &str) -> std::io::Result<String> {
let mut stdout = std::io::stdout();
write!(stdout, "{}", prompt)?;
stdout.flush()?;
read_response()
}
pub fn prompt_response_stderr(prompt: &str) -> std::io::Result<String> {
let mut stderr = std::io::stderr();
write!(stderr, "{}", prompt)?;
stderr.flush()?;
read_response()
}
pub fn prompt_password_stdout(prompt: &str) -> std::io::Result<String> {
let mut stdout = std::io::stdout();
write!(stdout, "{}", prompt)?;
stdout.flush()?;
read_password()
}
pub fn prompt_password_stderr(prompt: &str) -> std::io::Result<String> {
let mut stderr = std::io::stderr();
write!(stderr, "{}", prompt)?;
stderr.flush()?;
read_password()
}