freebsd-dev/usr.bin/calendar/calendar.c
Mike Pritchard 3b4984d039 Initialize the group list when we switch uids when run as
root with "calendar -a".  Drop all privs when execing other
programs.

Obtained from: OpenBSD
1997-02-06 05:42:49 +00:00

141 lines
3.6 KiB
C

/*
* Copyright (c) 1989, 1993, 1994
* 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
#endif /* not lint */
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "pathnames.h"
#include "calendar.h"
struct passwd *pw;
int doall = 0;
time_t f_time = 0;
int f_dayAfter = 0; /* days after current date */
int f_dayBefore = 0; /* days before current date */
int
main(argc, argv)
int argc;
char *argv[];
{
extern int optind;
int ch;
(void) setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "?-af:t:A:B:")) != EOF)
switch (ch) {
case '-': /* backward contemptible */
case 'a':
if (getuid()) {
errno = EPERM;
err(1, NULL);
}
doall = 1;
break;
case 'f': /* other calendar file */
calendarFile = optarg;
break;
case 't': /* other date, undocumented, for tests */
f_time = Mktime (optarg);
break;
case 'A': /* days after current date */
f_dayAfter = atoi(optarg);
break;
case 'B': /* days before current date */
f_dayBefore = atoi(optarg);
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc)
usage();
/* use current time */
if (f_time <= 0)
(void)time(&f_time);
settime(f_time);
if (doall)
while ((pw = getpwent()) != NULL) {
(void)setegid(pw->pw_gid);
(void)initgroups(pw->pw_name, pw->pw_gid);
(void)seteuid(pw->pw_uid);
if (!chdir(pw->pw_dir))
cal();
(void)seteuid(0);
}
else
cal();
exit(0);
}
void
usage()
{
(void)fprintf(stderr,
"usage: calendar [-a] [-A days] [-B days] [-f calendarfile]\n");
exit(1);
}