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git-svn-id: http://encfs.googlecode.com/svn/trunk@92 db9cf616-1c43-0410-9cb8-a902689de0d6
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Valient Gough
195
cipher/readpassphrase.cpp
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195
cipher/readpassphrase.cpp
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/* $OpenBSD: readpassphrase.c,v 1.12 2001/12/15 05:41:00 millert Exp $ */
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/*
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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 1.12 2001/12/15 05:41:00 millert Exp $";
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#endif /* LIBC_SCCS and not lint */
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//#include "includes.h"
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#ifndef HAVE_READPASSPHRASE
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#include <csignal>
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#include <cstdio>
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#include <cerrno>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <paths.h>
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#include <cstring>
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#include <cctype>
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#include <termios.h>
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#include "cipher/readpassphrase.h"
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#ifdef TCSASOFT
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# define _T_FLUSH (TCSAFLUSH|TCSASOFT)
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#else
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# define _T_FLUSH (TCSAFLUSH)
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#endif
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/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
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#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
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# define _POSIX_VDISABLE VDISABLE
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#endif
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static volatile sig_atomic_t signo;
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static void handler(int);
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char *
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readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
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{
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ssize_t nr;
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int input, output, save_errno;
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char ch, *p, *end;
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struct termios term, oterm;
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struct sigaction sa, saveint, savehup, savequit, saveterm;
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struct sigaction savetstp, savettin, savettou;
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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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restart:
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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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* Catch signals that would otherwise cause the user to end
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* up with echo turned off in the shell. Don't worry about
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* things like SIGALRM and SIGPIPE for now.
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*/
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0; /* don't restart system calls */
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sa.sa_handler = handler;
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(void)sigaction(SIGINT, &sa, &saveint);
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(void)sigaction(SIGHUP, &sa, &savehup);
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(void)sigaction(SIGQUIT, &sa, &savequit);
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(void)sigaction(SIGTERM, &sa, &saveterm);
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(void)sigaction(SIGTSTP, &sa, &savetstp);
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(void)sigaction(SIGTTIN, &sa, &savettin);
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(void)sigaction(SIGTTOU, &sa, &savettou);
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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))
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term.c_lflag &= ~(ECHO | ECHONL);
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#ifdef VSTATUS
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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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#endif
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(void)tcsetattr(input, _T_FLUSH, &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; (nr = 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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save_errno = errno;
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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 signals. */
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if (memcmp(&term, &oterm, sizeof(term)) != 0)
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(void)tcsetattr(input, _T_FLUSH, &oterm);
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(void)sigaction(SIGINT, &saveint, NULL);
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(void)sigaction(SIGHUP, &savehup, NULL);
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(void)sigaction(SIGQUIT, &savequit, NULL);
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(void)sigaction(SIGTERM, &saveterm, NULL);
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(void)sigaction(SIGTSTP, &savetstp, NULL);
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(void)sigaction(SIGTTIN, &savettin, NULL);
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(void)sigaction(SIGTTOU, &savettou, NULL);
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if (input != STDIN_FILENO)
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(void)close(input);
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/*
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* If we were interrupted by a signal, resend it to ourselves
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* now that we have restored the signal handlers.
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*/
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if (signo) {
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kill(getpid(), signo);
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switch (signo) {
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case SIGTSTP:
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case SIGTTIN:
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case SIGTTOU:
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signo = 0;
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goto restart;
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}
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}
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errno = save_errno;
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return(nr == -1 ? NULL : buf);
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}
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#endif /* HAVE_READPASSPHRASE */
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#if 0
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char *
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getpass(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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#endif
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static void handler(int s)
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{
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signo = s;
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}
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