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+/* $OpenBSD: readpassphrase.c,v 1.22 2010/01/13 10:20:54 dtucker Exp $ */
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+
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+/*
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+ * Copyright (c) 2000-2002, 2007 Todd C. Miller <Todd.Miller@courtesan.com>
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+ *
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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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+ *
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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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+ *
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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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+ */
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+
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+/* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
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+
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+#include "orconfig.h"
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+
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+#ifndef HAVE_READPASSPHRASE
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+
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+#include <termios.h>
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+#include <signal.h>
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+#include <ctype.h>
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+#include <fcntl.h>
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+#include <readpassphrase.h>
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+#include <errno.h>
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+#include <string.h>
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+#include <unistd.h>
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+
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+#ifndef _PATH_TTY
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+# define _PATH_TTY "/dev/tty"
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+#endif
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+
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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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+
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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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+
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+#ifndef _NSIG
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+# ifdef NSIG
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+# define _NSIG NSIG
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+# else
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+# define _NSIG 128
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+# endif
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+#endif
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+
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+static volatile sig_atomic_t signo[_NSIG];
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+
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+static void handler(int);
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+
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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 bytes_written = 0;
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+ ssize_t nr;
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+ int input, output, save_errno, i, need_restart;
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+ char ch, *p, *end;
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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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+
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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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+restart:
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+ for (i = 0; i < _NSIG; i++)
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+ signo[i] = 0;
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+ nr = -1;
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+ save_errno = 0;
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+ need_restart = 0;
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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 ((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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+ 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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+ /*
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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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+ */
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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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+
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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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+#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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+ 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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+ }
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+
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+ /* No I/O if we are already backgrounded. */
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+ if (signo[SIGTTOU] != 1 && signo[SIGTTIN] != 1) {
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+ if (!(flags & RPP_STDIN))
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+ bytes_written = write(output, prompt, strlen(prompt));
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+ end = buf + bufsiz - 1;
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+ p = buf;
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+ while ((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 = (char)tolower(ch);
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+ if ((flags & RPP_FORCEUPPER))
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+ ch = (char)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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+ bytes_written = write(output, "\n", 1);
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+ }
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+
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+ (void) bytes_written;
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+
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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, _T_FLUSH, &oterm) == -1 &&
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+ errno == EINTR)
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+ continue;
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+ }
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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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+ (void)close(input);
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+
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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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+ for (i = 0; i < _NSIG; i++) {
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+ if (signo[i]) {
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+ kill(getpid(), i);
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+ switch (i) {
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+ case SIGTSTP:
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+ case SIGTTIN:
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+ case SIGTTOU:
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+ need_restart = 1;
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+ }
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+ }
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+ }
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+ if (need_restart)
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+ goto restart;
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+
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+ if (save_errno)
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+ errno = save_errno;
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+ return(nr == -1 ? NULL : buf);
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+}
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+
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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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+
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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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+
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+static void handler(int s)
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+{
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+
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+ signo[s] = 1;
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+}
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+#endif /* HAVE_READPASSPHRASE */
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Nick Mathewson