269 lines
5.9 KiB
C
269 lines
5.9 KiB
C
/*
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* Copyright 1990 - 1995, Julianne Frances Haugh
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* Copyright 1998, Pavel Machek <pavel@ucw.cz>
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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. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include "rcsid.h"
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RCSID("$Id: getpass.c,v 1.9 1999/06/07 16:40:44 marekm Exp $")
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#include "defines.h"
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#include <signal.h>
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#include <stdio.h>
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/* new code, #undef if there are any problems... */
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#define USE_SETJMP 1
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#ifdef USE_SETJMP
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#include <setjmp.h>
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static sigjmp_buf intr; /* where to jump on SIGINT */
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#endif
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static int sig_caught;
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#ifdef HAVE_SIGACTION
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static struct sigaction sigact;
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#endif
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/*ARGSUSED*/
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static RETSIGTYPE
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sig_catch(int sig)
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{
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sig_caught = 1;
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#ifdef USE_SETJMP
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siglongjmp(intr, 1);
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#endif
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}
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#define MAXLEN 127
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#ifndef NEW_READPASS /* ./configure --enable-readpass */
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#define OLD_READPASS 1
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#endif
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#ifndef OLD_READPASS
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static char *
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readpass(FILE *fp)
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{
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static char input[MAXLEN + 1], asterix[MAXLEN + 1];
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static char once;
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char *cp, *ap, c;
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int i;
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if (!once) {
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srandom(time(0)*getpid());
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once = 1;
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}
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cp = input;
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ap = asterix;
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while (read(fileno(fp), &c, 1)) {
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switch (c) {
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case '\n':
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case '\r':
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goto endwhile;
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case '\b':
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case 127:
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if (cp > input) {
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cp--; ap--;
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for (i = 0; i < (*ap); i++) {
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putc('\b', stdout);
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putc(' ', stdout);
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putc('\b', stdout);
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}
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} else
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putc('\a', stdout); /* BEL */
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break;
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default:
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*cp++ = c;
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*ap++ = (random() % 4)+1;
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for (i = 0; i < (*(ap-1)); i++)
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putc('*', stdout);
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break;
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}
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fflush(stdout);
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if (cp == input + MAXLEN)
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break;
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}
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endwhile:
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*cp = 0;
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putc('\n', stdout);
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return input;
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}
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#else
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static char *
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readpass(FILE *fp)
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{
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static char input[MAXLEN + 1];
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char *cp;
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if (fgets(input, sizeof input, fp) == input) {
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if ((cp = strrchr(input, '\n')))
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*cp = '\0';
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else
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input[sizeof input - 1] = '\0';
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#ifdef USE_SGTTY
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putc('\n', stdout);
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#endif
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return input;
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}
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return NULL;
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}
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#endif
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char *
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libshadow_getpass(const char *prompt)
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{
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static char nostring[1] = "";
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static char *return_value;
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volatile int tty_opened;
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static FILE *fp;
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volatile int is_tty;
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#ifdef HAVE_SIGACTION
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struct sigaction old_sigact;
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#else
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RETSIGTYPE (*old_signal)();
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#endif
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TERMIO new_modes;
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TERMIO old_modes;
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/*
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* set a flag so the SIGINT signal can be re-sent if it
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* is caught
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*/
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sig_caught = 0;
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return_value = NULL;
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tty_opened = 0;
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/*
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* if /dev/tty can't be opened, getpass() needs to read
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* from stdin instead.
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*/
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if ((fp = fopen ("/dev/tty", "r")) == 0) {
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fp = stdin;
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setbuf (fp, (char *) 0);
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} else {
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tty_opened = 1;
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}
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/*
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* the current tty modes must be saved so they can be
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* restored later on. echo will be turned off, except
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* for the newline character (BSD has to punt on this)
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*/
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is_tty = 1;
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if (GTTY(fileno(fp), &old_modes)) {
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is_tty = 0;
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#if 0 /* to make getpass work with redirected stdin */
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return_value = NULL;
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goto out2;
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#endif
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}
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#ifdef USE_SETJMP
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/*
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* If we get a SIGINT, sig_catch() will jump here -
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* no need to press Enter after Ctrl-C.
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*/
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if (sigsetjmp(intr, 1))
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goto out;
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#endif
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#ifdef HAVE_SIGACTION
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sigact.sa_handler = sig_catch;
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = 0;
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sigaction(SIGINT, &sigact, &old_sigact);
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#else
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old_signal = signal (SIGINT, sig_catch);
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#endif
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new_modes = old_modes;
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#ifdef USE_SGTTY
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new_modes.sg_flags &= ~ECHO ;
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#else
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#ifdef OLD_READPASS
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new_modes.c_lflag &= ~(ECHO|ECHOE|ECHOK);
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#else
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new_modes.c_lflag &= ~(ECHO|ECHOE|ECHOK|ICANON);
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#endif
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new_modes.c_lflag |= ECHONL;
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#endif
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if (is_tty) {
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if (STTY(fileno(fp), &new_modes))
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goto out;
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}
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/*
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* the prompt is output, and the response read without
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* echoing. the trailing newline must be removed. if
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* the fgets() returns an error, a NULL pointer is
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* returned.
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*/
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if ((fputs(prompt, stdout) != EOF) && (fflush(stdout) != EOF))
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return_value = readpass(fp);
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out:
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/*
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* the old SIGINT handler is restored after the tty
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* modes. then /dev/tty is closed if it was opened in
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* the beginning. finally, if a signal was caught it
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* is sent to this process for normal processing.
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*/
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if (is_tty) {
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if (STTY(fileno(fp), &old_modes))
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return_value = NULL;
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}
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#ifdef HAVE_SIGACTION
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(void) sigaction (SIGINT, &old_sigact, NULL);
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#else
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(void) signal (SIGINT, old_signal);
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#endif
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out2:
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if (tty_opened)
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(void) fclose (fp);
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if (sig_caught) {
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kill(getpid(), SIGINT);
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return_value = NULL;
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}
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if (!return_value) {
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nostring[0] = '\0';
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return_value = nostring;
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}
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return return_value;
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}
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