OpenBSD-4.6/usr.bin/calendar/calendar.c
/* $OpenBSD: calendar.c,v 1.25 2005/11/16 16:45:11 deraadt Exp $ */
/*
* 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. 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
#if 0
static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
#else
static const char rcsid[] = "$OpenBSD: calendar.c,v 1.25 2005/11/16 16:45:11 deraadt Exp $";
#endif
#endif /* not lint */
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <login_cap.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include "pathnames.h"
#include "calendar.h"
char *calendarFile = "calendar"; /* default calendar file */
char *calendarHome = ".calendar"; /* HOME */
char *calendarNoMail = "nomail"; /* don't sent mail if this file exists */
struct passwd *pw;
int doall = 0;
time_t f_time = 0;
int bodun_always = 0;
int f_dayAfter = 0; /* days after current date */
int f_dayBefore = 0; /* days before current date */
int f_SetdayAfter = 0; /* calendar invoked with -A */
struct specialev spev[NUMEV];
void childsig(int);
int
main(int argc, char *argv[])
{
int ch;
char *caldir;
(void)setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "abf:t:A:B:-")) != -1)
switch (ch) {
case '-': /* backward contemptible */
case 'a':
if (getuid())
errx(1, "%s", strerror(EPERM));
doall = 1;
break;
case 'b':
bodun_always++;
break;
case 'f': /* other calendar file */
calendarFile = optarg;
break;
case 't': /* other date, undocumented, for tests */
if ((f_time = Mktime(optarg)) <= 0)
errx(1, "specified date is outside allowed range");
break;
case 'A': /* days after current date */
f_dayAfter = atoi(optarg);
f_SetdayAfter = 1;
break;
case 'B': /* days before current date */
f_dayBefore = atoi(optarg);
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc)
usage();
/* use current time */
if (f_time <= 0)
(void)time(&f_time);
if (f_dayBefore) {
/* Move back in time and only look forwards */
f_dayAfter += f_dayBefore;
f_time -= SECSPERDAY * f_dayBefore;
f_dayBefore = 0;
}
settime(&f_time);
if (doall) {
pid_t kid, deadkid;
int kidstat, kidreaped, runningkids;
int acstat;
struct stat sbuf;
time_t t;
unsigned int sleeptime;
signal(SIGCHLD, childsig);
runningkids = 0;
t = time(NULL);
while ((pw = getpwent()) != NULL) {
acstat = 0;
/* Avoid unnecessary forks. The calendar file is only
* opened as the user later; if it can't be opened,
* it's no big deal. Also, get to correct directory.
* Note that in an NFS environment root may get EACCES
* on a chdir(), in which case we have to fork. As long as
* we can chdir() we can stat(), unless the user is
* modifying permissions while this is running.
*/
if (chdir(pw->pw_dir)) {
if (errno == EACCES)
acstat = 1;
else
continue;
}
if (stat(calendarFile, &sbuf) != 0) {
if (chdir(calendarHome)) {
if (errno == EACCES)
acstat = 1;
else
continue;
}
if (stat(calendarNoMail, &sbuf) == 0 ||
stat(calendarFile, &sbuf) != 0)
continue;
}
sleeptime = USERTIMEOUT;
switch ((kid = fork())) {
case -1: /* error */
warn("fork");
continue;
case 0: /* child */
(void)setlocale(LC_ALL, "");
if (setusercontext(NULL, pw, pw->pw_uid,
LOGIN_SETALL ^ LOGIN_SETLOGIN))
err(1, "unable to set user context (uid %u)",
pw->pw_uid);
if (acstat) {
if (chdir(pw->pw_dir) ||
stat(calendarFile, &sbuf) != 0 ||
chdir(calendarHome) ||
stat(calendarNoMail, &sbuf) == 0 ||
stat(calendarFile, &sbuf) != 0)
exit(0);
}
cal();
exit(0);
}
/* parent: wait a reasonable time, then kill child if
* necessary.
*/
runningkids++;
kidreaped = 0;
do {
sleeptime = sleep(sleeptime);
/* Note that there is the possibility, if the sleep
* stops early due to some other signal, of the child
* terminating and not getting detected during the next
* sleep. In that unlikely worst case, we just sleep
* too long for that user.
*/
for (;;) {
deadkid = waitpid(-1, &kidstat, WNOHANG);
if (deadkid <= 0)
break;
runningkids--;
if (deadkid == kid) {
kidreaped = 1;
sleeptime = 0;
}
}
} while (sleeptime);
if (!kidreaped) {
/* It doesn't _really_ matter if the kill fails, e.g.
* if there's only a zombie now.
*/
(void)kill(kid, SIGTERM);
warnx("uid %u did not finish in time", pw->pw_uid);
}
if (time(NULL) - t >= SECSPERDAY)
errx(2, "'calendar -a' took more than a day; "
"stopped at uid %u",
pw->pw_uid);
}
for (;;) {
deadkid = waitpid(-1, &kidstat, WNOHANG);
if (deadkid <= 0)
break;
runningkids--;
}
if (runningkids)
warnx("%d child processes still running when "
"'calendar -a' finished", runningkids);
} else if ((caldir = getenv("CALENDAR_DIR")) != NULL) {
if(!chdir(caldir))
cal();
} else
cal();
exit(0);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: calendar [-ab] [-A num] [-B num] [-f calendarfile] "
"[-t [[[cc]yy][mm]]dd]\n");
exit(1);
}
void
childsig(int signo)
{
}