135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/*
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* Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$OpenBSD: readpassphrase.c,v 1.7 2001/08/07 19:34:11 millert Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <pwd.h>
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#include <signal.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include <readpassphrase.h>
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char *
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readpassphrase(prompt, buf, bufsiz, flags)
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const char *prompt;
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char *buf;
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size_t bufsiz;
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int flags;
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{
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struct termios term, oterm;
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char ch, *p, *end;
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int input, output;
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sigset_t oset, nset;
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/* I suppose we could alloc on demand in this case (XXX). */
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if (bufsiz == 0) {
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errno = EINVAL;
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return(NULL);
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}
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/*
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* Read and write to /dev/tty if available. If not, read from
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* stdin and write to stderr unless a tty is required.
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*/
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if ((input = output = _open(_PATH_TTY, O_RDWR)) == -1) {
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if (flags & RPP_REQUIRE_TTY) {
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errno = ENOTTY;
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return(NULL);
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}
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input = STDIN_FILENO;
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output = STDERR_FILENO;
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}
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/*
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* We block SIGINT and SIGTSTP so the terminal is not left
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* in an inconsistent state (ie: no echo). It would probably
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* be better to simply catch these though.
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*/
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sigemptyset(&nset);
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sigaddset(&nset, SIGINT);
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sigaddset(&nset, SIGTSTP);
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(void)_sigprocmask(SIG_BLOCK, &nset, &oset);
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/* Turn off echo if possible. */
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if (tcgetattr(input, &oterm) == 0) {
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memcpy(&term, &oterm, sizeof(term));
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if (!(flags & RPP_ECHO_ON) && (term.c_lflag & ECHO))
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term.c_lflag &= ~ECHO;
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if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
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term.c_cc[VSTATUS] = _POSIX_VDISABLE;
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(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
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} else {
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memset(&term, 0, sizeof(term));
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memset(&oterm, 0, sizeof(oterm));
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}
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(void)_write(output, prompt, strlen(prompt));
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end = buf + bufsiz - 1;
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for (p = buf; _read(input, &ch, 1) == 1 && ch != '\n' && ch != '\r';) {
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if (p < end) {
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if ((flags & RPP_SEVENBIT))
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ch &= 0x7f;
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if (isalpha(ch)) {
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if ((flags & RPP_FORCELOWER))
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ch = tolower(ch);
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if ((flags & RPP_FORCEUPPER))
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ch = toupper(ch);
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}
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*p++ = ch;
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}
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}
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*p = '\0';
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if (!(term.c_lflag & ECHO))
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(void)_write(output, "\n", 1);
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/* Restore old terminal settings and signal mask. */
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if (memcmp(&term, &oterm, sizeof(term)) != 0)
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(void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm);
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(void)_sigprocmask(SIG_SETMASK, &oset, NULL);
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if (input != STDIN_FILENO)
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(void)_close(input);
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return(buf);
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}
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char *
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getpass(prompt)
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const char *prompt;
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{
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static char buf[_PASSWORD_LEN + 1];
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return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
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}
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