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/* $OpenBSD: readpassphrase.c,v 1.21 2008/01/17 16:27:07 millert Exp $ */
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* Copyright (c) 2000-2002, 2007 Todd C. Miller <Todd.Miller@courtesan.com>
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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#include <readpassphrase.h>
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static volatile sig_atomic_t signo;
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static void handler(int);
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readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
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int input, output, save_errno;
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struct termios term, oterm;
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struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
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struct sigaction savetstp, savettin, savettou, savepipe;
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/* I suppose we could alloc on demand in this case (XXX). */
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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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if ((flags & RPP_STDIN) ||
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(input = output = open(_PATH_TTY, O_RDWR)) == -1) {
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if (flags & RPP_REQUIRE_TTY) {
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output = STDERR_FILENO;
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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 SIGXCPU and SIGVTALRM for now.
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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(SIGALRM, &sa, &savealrm);
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(void)sigaction(SIGHUP, &sa, &savehup);
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(void)sigaction(SIGINT, &sa, &saveint);
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(void)sigaction(SIGPIPE, &sa, &savepipe);
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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 (input != STDIN_FILENO && 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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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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memset(&term, 0, sizeof(term));
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term.c_lflag |= ECHO;
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memset(&oterm, 0, sizeof(oterm));
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oterm.c_lflag |= ECHO;
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/* No I/O if we are already backgrounded. */
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if (signo != SIGTTOU && signo != SIGTTIN) {
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if (!(flags & RPP_STDIN))
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(void)write(output, prompt, strlen(prompt));
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end = buf + bufsiz - 1;
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while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
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if ((flags & RPP_SEVENBIT))
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if ((flags & RPP_FORCELOWER))
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ch = (char)tolower(ch);
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if ((flags & RPP_FORCEUPPER))
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ch = (char)toupper(ch);
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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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while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
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(void)sigaction(SIGALRM, &savealrm, NULL);
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(void)sigaction(SIGHUP, &savehup, NULL);
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(void)sigaction(SIGINT, &saveint, NULL);
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(void)sigaction(SIGQUIT, &savequit, NULL);
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(void)sigaction(SIGPIPE, &savepipe, 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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* 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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kill(getpid(), signo);
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return(nr == -1 ? NULL : buf);
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getpass(const char *prompt)
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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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static void handler(int s)