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-rw-r--r--lib/getpass.c237
1 files changed, 237 insertions, 0 deletions
diff --git a/lib/getpass.c b/lib/getpass.c
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+++ b/lib/getpass.c
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+/* Copyright (C) 1992-2001, 2003-2007, 2009-2022 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ This file 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.
+
+ This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
+
+#ifndef _LIBC
+/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
+ warns for the null checks on 'prompt' below. */
+# define _GL_ARG_NONNULL(params)
+# include <config.h>
+#endif
+
+#include "getpass.h"
+
+#include <stdio.h>
+
+#if !(defined _WIN32 && !defined __CYGWIN__)
+
+# include <stdbool.h>
+
+# if HAVE_DECL___FSETLOCKING && HAVE___FSETLOCKING
+# if HAVE_STDIO_EXT_H
+# include <stdio_ext.h>
+# endif
+# else
+# define __fsetlocking(stream, type) /* empty */
+# endif
+
+# if HAVE_TERMIOS_H
+# include <termios.h>
+# endif
+
+# if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+# else
+# if !HAVE_DECL_FFLUSH_UNLOCKED
+# undef fflush_unlocked
+# define fflush_unlocked(x) fflush (x)
+# endif
+# if !HAVE_DECL_FLOCKFILE
+# undef flockfile
+# define flockfile(x) ((void) 0)
+# endif
+# if !HAVE_DECL_FUNLOCKFILE
+# undef funlockfile
+# define funlockfile(x) ((void) 0)
+# endif
+# if !HAVE_DECL_FPUTS_UNLOCKED
+# undef fputs_unlocked
+# define fputs_unlocked(str,stream) fputs (str, stream)
+# endif
+# if !HAVE_DECL_PUTC_UNLOCKED
+# undef putc_unlocked
+# define putc_unlocked(c,stream) putc (c, stream)
+# endif
+# endif
+
+/* 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 *tty;
+ FILE *in, *out;
+# if HAVE_TCGETATTR
+ struct termios s, t;
+# endif
+ bool tty_changed = false;
+ 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. */
+
+ tty = fopen ("/dev/tty", "w+e");
+ if (tty == NULL)
+ {
+ in = stdin;
+ out = stderr;
+ }
+ else
+ {
+ /* We do the locking ourselves. */
+ __fsetlocking (tty, FSETLOCKING_BYCALLER);
+
+ out = in = tty;
+ }
+
+ flockfile (out);
+
+ /* Turn echoing off if it is on now. */
+# if HAVE_TCGETATTR
+ 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);
+ }
+# endif
+
+ if (prompt)
+ {
+ /* Write the prompt. */
+ fputs_unlocked (prompt, out);
+ fflush_unlocked (out);
+ }
+
+ /* Read the password. */
+ nread = getline (&buf, &bufsize, in);
+
+ /* According to the C standard, input may not be followed by output
+ on the same stream without an intervening call to a file
+ positioning function. Suppose in == out; then without this fseek
+ call, on Solaris, HP-UX, AIX, OSF/1, the previous input gets
+ echoed, whereas on IRIX, the following newline is not output as
+ it should be. POSIX imposes similar restrictions if fileno (in)
+ == fileno (out). The POSIX restrictions are tricky and change
+ from POSIX version to POSIX version, so play it safe and invoke
+ fseek even if in != out. */
+ fseeko (out, 0, SEEK_CUR);
+
+ 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. */
+ putc_unlocked ('\n', out);
+ }
+ }
+ }
+
+ /* Restore the original setting. */
+# if HAVE_TCSETATTR
+ if (tty_changed)
+ tcsetattr (fileno (in), TCSAFLUSH | TCSASOFT, &s);
+# endif
+
+ funlockfile (out);
+
+ call_fclose (tty);
+
+ return buf;
+}
+
+#else /* W32 native */
+
+/* Windows implementation by Martin Lambers <marlam@marlam.de>,
+ improved by Simon Josefsson. */
+
+/* For PASS_MAX. */
+# include <limits.h>
+/* For _getch(). */
+# include <conio.h>
+/* For strdup(). */
+# include <string.h>
+
+# ifndef PASS_MAX
+# define PASS_MAX 512
+# endif
+
+char *
+getpass (const char *prompt)
+{
+ char getpassbuf[PASS_MAX + 1];
+ size_t i = 0;
+ int c;
+
+ if (prompt)
+ {
+ fputs (prompt, stderr);
+ fflush (stderr);
+ }
+
+ for (;;)
+ {
+ c = _getch ();
+ if (c == '\r')
+ {
+ getpassbuf[i] = '\0';
+ break;
+ }
+ else if (i < PASS_MAX)
+ {
+ getpassbuf[i++] = c;
+ }
+
+ if (i >= PASS_MAX)
+ {
+ getpassbuf[i] = '\0';
+ break;
+ }
+ }
+
+ if (prompt)
+ {
+ fputs ("\r\n", stderr);
+ fflush (stderr);
+ }
+
+ return strdup (getpassbuf);
+}
+#endif