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author | Simon Josefsson <simon@josefsson.org> | 2004-08-15 10:28:45 +0000 |
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committer | Simon Josefsson <simon@josefsson.org> | 2004-08-15 10:28:45 +0000 |
commit | d30a9c7494351bb538acbecb13cddcaefbbe2f45 (patch) | |
tree | f84af7482d7bad396d7d3f091d35ebdb197f5d82 /gl/getpass.c | |
parent | ecf58cb15a0e3c7ff410d4517395256ba9e50d1a (diff) | |
download | gnutls-d30a9c7494351bb538acbecb13cddcaefbbe2f45.tar.gz |
Replace ad-hoc 'read_pass' with gnulib module 'getpass-gnu'.
Diffstat (limited to 'gl/getpass.c')
-rw-r--r-- | gl/getpass.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/gl/getpass.c b/gl/getpass.c new file mode 100644 index 0000000000..9ac01f2277 --- /dev/null +++ b/gl/getpass.c @@ -0,0 +1,196 @@ +/* Copyright (C) 1992-2001, 2003 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +#if !_LIBC +# include "getpass.h" +#endif + +#if _LIBC +# define HAVE_STDIO_EXT_H 1 +#endif + +#include <stdbool.h> + +#include <stdio.h> +#if HAVE_STDIO_EXT_H +# include <stdio_ext.h> +#else +# define __fsetlocking(stream, type) /* empty */ +#endif +#if !_LIBC +# include "getline.h" +#endif + +#include <termios.h> +#include <unistd.h> + +#if _LIBC +# include <wchar.h> +#endif + +#if _LIBC +# define NOTCANCEL_MODE "c" +#else +# define NOTCANCEL_MODE +#endif + +#if _LIBC +# define flockfile(s) _IO_flockfile (s) +# define funlockfile(s) _IO_funlockfile (s) +#else +# include "unlocked-io.h" +#endif + +#if _LIBC +# include <bits/libc-lock.h> +#else +# define __libc_cleanup_push(function, arg) /* empty */ +# define __libc_cleanup_pop(execute) /* empty */ +#endif + +#if !_LIBC +# define __getline getline +# define __tcgetattr tcgetattr +#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; + struct termios s, t; + bool 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. */ + + tty = fopen ("/dev/tty", "w+" NOTCANCEL_MODE); + if (tty == NULL) + { + in = stdin; + out = stderr; + } + else + { + /* We do the locking ourselves. */ + __fsetlocking (tty, FSETLOCKING_BYCALLER); + + out = in = tty; + } + + /* Make sure the stream we opened is closed even if the thread is + canceled. */ + __libc_cleanup_push (call_fclose, tty); + + 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 = false; + + /* Write the prompt. */ +#ifdef USE_IN_LIBIO + if (_IO_fwide (out, 0) > 0) + __fwprintf (out, L"%s", prompt); + else +#endif + fputs_unlocked (prompt, out); + fflush_unlocked (out); + + /* Read the password. */ + nread = __getline (&buf, &bufsize, in); + +#if !_LIBC + /* As far as is known, glibc doesn't need this no-op fseek. */ + + /* 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. */ + fseek (out, 0, SEEK_CUR); +#endif + + 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. */ +#ifdef USE_IN_LIBIO + if (_IO_fwide (out, 0) > 0) + putwc_unlocked (L'\n', out); + else +#endif + putc_unlocked ('\n', out); + } + } + } + + /* Restore the original setting. */ + if (tty_changed) + (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s); + + funlockfile (out); + + __libc_cleanup_pop (0); + + call_fclose (tty); + + return buf; +} |