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/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/termios.h>
#include <signal.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
static struct termios oterm, term;
static sig_t ointhandler, oquithandler, otstphandler, oconthandler;
static FILE *fp;
static void
sighandler(int signo)
{
/* restore tty state */
(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm);
/* restore old sig handlers */
(void)signal(SIGINT, ointhandler);
(void)signal(SIGQUIT, oquithandler);
(void)signal(SIGTSTP, otstphandler);
/* resend us this signal */
(void)kill(getpid(), signo);
}
/* ARGSUSED */
static void
sigconthandler(int signo)
{
/* re-install our signal handlers */
ointhandler = signal(SIGINT, sighandler);
oquithandler = signal(SIGQUIT, sighandler);
otstphandler = signal(SIGTSTP, sighandler);
/* turn off echo again */
(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
}
char *
getpass(prompt)
const char *prompt;
{
register int ch;
register char *p;
FILE *outfp;
long omask;
static char buf[_PASSWORD_LEN + 1];
/*
* read and write to /dev/tty if possible; else read from
* stdin and write to stderr.
*/
if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
outfp = stderr;
fp = stdin;
}
ointhandler = signal(SIGINT, sighandler);
oquithandler = signal(SIGQUIT, sighandler);
otstphandler = signal(SIGTSTP, sighandler);
oconthandler = signal(SIGCONT, sigconthandler);
(void)tcgetattr(fileno(fp), &oterm);
term = oterm;
term.c_lflag &= ~ECHO;
(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
(void)fputs(prompt, outfp);
rewind(outfp); /* implied flush */
for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
if (p < buf + _PASSWORD_LEN)
*p++ = ch;
*p = '\0';
(void)write(fileno(outfp), "\n", 1);
(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm);
/* restore old sig handlers */
(void)signal(SIGINT, ointhandler);
(void)signal(SIGQUIT, oquithandler);
(void)signal(SIGTSTP, otstphandler);
(void)signal(SIGCONT, oconthandler);
if (fp != stdin)
(void)fclose(fp);
return(buf);
}
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