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glibc/misc/getpass.c
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/* Copyright (C) 1992-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdio.h> | |
#include <stdio_ext.h> | |
#include <string.h> /* For string function builtin redirect. */ | |
#include <termios.h> | |
#include <unistd.h> | |
#include <wchar.h> | |
#define flockfile(s) _IO_flockfile (s) | |
#define funlockfile(s) _IO_funlockfile (s) | |
#include <libc-lock.h> | |
/* It is desirable to use this bit on systems that have it. | |
The only bit of terminal state we want to twiddle is echoing, which is | |
done in software; there is no need to change the state of the terminal | |
hardware. */ | |
#ifndef TCSASOFT | |
#define TCSASOFT 0 | |
#endif | |
static void | |
call_fclose (void *arg) | |
{ | |
if (arg != NULL) | |
fclose (arg); | |
} | |
char * | |
getpass (const char *prompt) | |
{ | |
FILE *in, *out; | |
struct termios s, t; | |
int tty_changed; | |
static char *buf; | |
static size_t bufsize; | |
ssize_t nread; | |
/* Try to write to and read from the terminal if we can. | |
If we can't open the terminal, use stderr and stdin. */ | |
in = fopen ("/dev/tty", "w+ce"); | |
if (in == NULL) | |
{ | |
in = stdin; | |
out = stderr; | |
} | |
else | |
{ | |
/* We do the locking ourselves. */ | |
__fsetlocking (in, FSETLOCKING_BYCALLER); | |
out = in; | |
} | |
/* Make sure the stream we opened is closed even if the thread is | |
canceled. */ | |
__libc_cleanup_push (call_fclose, in == out ? in : NULL); | |
flockfile (out); | |
/* Turn echoing off if it is on now. */ | |
if (__tcgetattr (fileno (in), &t) == 0) | |
{ | |
/* Save the old one. */ | |
s = t; | |
/* Tricky, tricky. */ | |
t.c_lflag &= ~(ECHO|ISIG); | |
tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0); | |
} | |
else | |
tty_changed = 0; | |
/* Write the prompt. */ | |
__fxprintf (out, "%s", prompt); | |
__fflush_unlocked (out); | |
/* Read the password. */ | |
nread = __getline (&buf, &bufsize, in); | |
if (buf != NULL) | |
{ | |
if (nread < 0) | |
buf[0] = '\0'; | |
else if (buf[nread - 1] == '\n') | |
{ | |
/* Remove the newline. */ | |
buf[nread - 1] = '\0'; | |
if (tty_changed) | |
/* Write the newline that was not echoed. */ | |
__fxprintf (out, "\n"); | |
} | |
} | |
/* Restore the original setting. */ | |
if (tty_changed) | |
(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s); | |
funlockfile (out); | |
__libc_cleanup_pop (0); | |
if (in != stdin) | |
/* We opened the terminal; now close it. */ | |
fclose (in); | |
return buf; | |
} |