Edit
IABSD.fr/src/usr.bin/calendar/calendar.c
sthen
- usr.bin/calendar/calendar.c
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/* $OpenBSD: calendar.c,v 1.42 2026/03/16 17:19:27 sthen 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. */ #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 <limits.h> #include <time.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; int daynames = 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_Setday = 0; /* calendar invoked with -A or -B */ struct specialev spev[NUMEV]; void childsig(int); int main(int argc, char *argv[]) { int ch; const char *errstr; char *caldir; (void)setlocale(LC_ALL, ""); while ((ch = getopt(argc, argv, "abwf: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 = 1; 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 = strtonum(optarg, 0, INT_MAX, &errstr); if (errstr) errx(1, "-A %s: %s", optarg, errstr); f_Setday = 1; break; case 'B': /* days before current date */ f_dayBefore = strtonum(optarg, 0, INT_MAX, &errstr); if (errstr) errx(1, "-B %s: %s", optarg, errstr); if (f_dayBefore != 0) f_Setday = 1; break; case 'w': daynames = 1; break; default: usage(); } argc -= optind; argv += optind; if (argc) usage(); if (doall) { if (unveil("/tmp", "rwc") == -1) err(1, "unveil /tmp"); if (unveil("/dev/null", "rw") == -1) err(1, "unveil /dev/null"); if (unveil("/", "r") == -1) err(1, "unveil /"); if (unveil(_PATH_SENDMAIL, "x") == -1) err(1, "unveil " _PATH_SENDMAIL); if (unveil(_PATH_CPP, "x") == -1) err(1, "unveil " _PATH_CPP); if (pledge("stdio rpath wpath cpath fattr getpw id proc exec", NULL) == -1) err(1, "pledge"); } else { if (pledge("stdio rpath proc exec", NULL) == -1) err(1, "pledge"); } /* 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)setpgid(getpid(), getpid()); (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. */ if (getpgid(kid) != getpgrp()) (void)killpg(getpgid(kid), SIGTERM); else (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 [-abw] [-A num] [-B num] [-f calendarfile] " "[-t [[[cc]yy]mm]dd]\n"); exit(1); } void childsig(int signo) { }