560 lines
14 KiB
C
560 lines
14 KiB
C
/* $NetBSD: cron.c,v 1.7 2010/10/02 12:22:20 tron Exp $ */
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/* Copyright 1988,1990,1993,1994 by Paul Vixie
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* All rights reserved
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*/
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1997,2000 by Internet Software Consortium, Inc.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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#if !defined(lint) && !defined(LINT)
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#if 0
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static char rcsid[] = "Id: cron.c,v 1.12 2004/01/23 18:56:42 vixie Exp";
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#else
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__RCSID("$NetBSD: cron.c,v 1.7 2010/10/02 12:22:20 tron Exp $");
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#endif
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#endif
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#define MAIN_PROGRAM
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#include "cron.h"
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enum timejump { negative, small, medium, large };
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static void usage(void),
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run_reboot_jobs(cron_db *),
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find_jobs(time_t, cron_db *, int, int),
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set_time(int),
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cron_sleep(int),
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sigchld_handler(int),
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sighup_handler(int),
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sigchld_reaper(void),
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quit(int),
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parse_args(int c, char *v[]);
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static volatile sig_atomic_t got_sighup, got_sigchld;
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static time_t timeRunning, virtualTime, clockTime;
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static long GMToff;
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static void
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usage(void) {
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const char **dflags;
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(void)fprintf(stderr, "usage: %s [-n] [-x [", getprogname());
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for (dflags = DebugFlagNames; *dflags; dflags++)
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(void)fprintf(stderr, "%s%s", *dflags, dflags[1] ? "," : "]");
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(void)fprintf(stderr, "]\n");
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exit(ERROR_EXIT);
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}
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int
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main(int argc, char *argv[]) {
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struct sigaction sact;
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cron_db database;
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setprogname(argv[0]);
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(void)setlocale(LC_ALL, "");
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(void)setvbuf(stdout, NULL, _IOLBF, 0);
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(void)setvbuf(stderr, NULL, _IOLBF, 0);
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NoFork = 0;
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parse_args(argc, argv);
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(void)memset(&sact, 0, sizeof sact);
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(void)sigemptyset(&sact.sa_mask);
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sact.sa_flags = 0;
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#ifdef SA_RESTART
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sact.sa_flags |= SA_RESTART;
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#endif
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sact.sa_handler = sigchld_handler;
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(void) sigaction(SIGCHLD, &sact, NULL);
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sact.sa_handler = sighup_handler;
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(void) sigaction(SIGHUP, &sact, NULL);
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sact.sa_handler = quit;
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(void) sigaction(SIGINT, &sact, NULL);
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(void) sigaction(SIGTERM, &sact, NULL);
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acquire_daemonlock(0);
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set_cron_uid();
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set_cron_cwd();
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if (setenv("PATH", _PATH_DEFPATH, 1) < 0) {
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log_it("CRON", getpid(), "DEATH", "can't malloc");
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exit(1);
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}
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/* if there are no debug flags turned on, fork as a daemon should.
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*/
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if (DebugFlags) {
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#if DEBUGGING
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(void)fprintf(stderr, "[%ld] cron started\n", (long)getpid());
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#endif
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} else if (NoFork == 0) {
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if (daemon(1, 0)) {
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log_it("CRON",getpid(),"DEATH","can't fork");
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exit(1);
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}
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}
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acquire_daemonlock(0);
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database.head = NULL;
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database.tail = NULL;
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database.mtime = (time_t) 0;
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load_database(&database);
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set_time(TRUE);
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run_reboot_jobs(&database);
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timeRunning = virtualTime = clockTime;
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/*
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* Too many clocks, not enough time (Al. Einstein)
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* These clocks are in minutes since the epoch, adjusted for timezone.
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* virtualTime: is the time it *would* be if we woke up
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* promptly and nobody ever changed the clock. It is
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* monotonically increasing... unless a timejump happens.
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* At the top of the loop, all jobs for 'virtualTime' have run.
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* timeRunning: is the time we last awakened.
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* clockTime: is the time when set_time was last called.
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*/
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for (;;) {
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int timeDiff;
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enum timejump wakeupKind;
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/* ... wait for the time (in minutes) to change ... */
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do {
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cron_sleep(timeRunning + 1);
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set_time(FALSE);
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} while (clockTime == timeRunning);
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timeRunning = clockTime;
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/*
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* Calculate how the current time differs from our virtual
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* clock. Classify the change into one of 4 cases.
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*/
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timeDiff = timeRunning - virtualTime;
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/* shortcut for the most common case */
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if (timeDiff == 1) {
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virtualTime = timeRunning;
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find_jobs(virtualTime, &database, TRUE, TRUE);
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} else {
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if (timeDiff > (3*MINUTE_COUNT) ||
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timeDiff < -(3*MINUTE_COUNT))
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wakeupKind = large;
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else if (timeDiff > 5)
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wakeupKind = medium;
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else if (timeDiff > 0)
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wakeupKind = small;
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else
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wakeupKind = negative;
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switch (wakeupKind) {
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case small:
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/*
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* case 1: timeDiff is a small positive number
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* (wokeup late) run jobs for each virtual
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* minute until caught up.
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*/
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Debug(DSCH, ("[%ld], normal case %d minutes to go\n",
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(long)getpid(), timeDiff));
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do {
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if (job_runqueue())
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(void)sleep(10);
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virtualTime++;
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find_jobs(virtualTime, &database,
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TRUE, TRUE);
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} while (virtualTime < timeRunning);
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break;
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case medium:
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/*
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* case 2: timeDiff is a medium-sized positive
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* number, for example because we went to DST
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* run wildcard jobs once, then run any
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* fixed-time jobs that would otherwise be
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* skipped if we use up our minute (possible,
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* if there are a lot of jobs to run) go
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* around the loop again so that wildcard jobs
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* have a chance to run, and we do our
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* housekeeping.
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*/
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Debug(DSCH, ("[%ld], DST begins %d minutes to go\n",
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(long)getpid(), timeDiff));
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/* run wildcard jobs for current minute */
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find_jobs(timeRunning, &database, TRUE, FALSE);
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/* run fixed-time jobs for each minute missed */
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do {
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if (job_runqueue())
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(void)sleep(10);
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virtualTime++;
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find_jobs(virtualTime, &database,
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FALSE, TRUE);
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set_time(FALSE);
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} while (virtualTime < timeRunning &&
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clockTime == timeRunning);
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break;
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case negative:
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/*
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* case 3: timeDiff is a small or medium-sized
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* negative num, eg. because of DST ending.
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* Just run the wildcard jobs. The fixed-time
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* jobs probably have already run, and should
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* not be repeated. Virtual time does not
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* change until we are caught up.
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*/
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Debug(DSCH, ("[%ld], DST ends %d minutes to go\n",
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(long)getpid(), timeDiff));
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find_jobs(timeRunning, &database, TRUE, FALSE);
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break;
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default:
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/*
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* other: time has changed a *lot*,
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* jump virtual time, and run everything
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*/
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Debug(DSCH, ("[%ld], clock jumped\n",
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(long)getpid()));
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virtualTime = timeRunning;
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find_jobs(timeRunning, &database, TRUE, TRUE);
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}
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}
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/* Jobs to be run (if any) are loaded; clear the queue. */
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(void)job_runqueue();
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/* Check to see if we received a signal while running jobs. */
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if (got_sighup) {
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got_sighup = 0;
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log_close();
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}
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if (got_sigchld) {
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got_sigchld = 0;
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sigchld_reaper();
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}
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load_database(&database);
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}
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}
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static void
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run_reboot_jobs(cron_db *db) {
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user *u;
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entry *e;
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for (u = db->head; u != NULL; u = u->next) {
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for (e = u->crontab; e != NULL; e = e->next) {
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if (e->flags & WHEN_REBOOT)
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job_add(e, u, StartTime);
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}
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}
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(void) job_runqueue();
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}
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static const char *
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bitprint(const bitstr_t *b, size_t l)
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{
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size_t i, set, clear;
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static char result[1024];
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char tmp[1024];
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result[0] = '\0';
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for (i = 0;;) {
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for (; i < l; i++)
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if (bit_test(b, i))
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break;
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if (i == l)
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return result;
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set = i;
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for (; i < l; i++)
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if (!bit_test(b, i))
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break;
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clear = i;
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if (set == 0 && clear == l) {
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snprintf(result, sizeof(result), "*");
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return result;
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}
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if (clear == l || set == clear - 1)
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snprintf(tmp, sizeof(tmp), ",%zu", set);
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else
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snprintf(tmp, sizeof(tmp), ",%zu-%zu", set, clear - 1);
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if (result[0] == '\0')
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strlcpy(result, tmp + 1, sizeof(result));
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else
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strlcat(result, tmp, sizeof(result));
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}
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}
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static const char *
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flagsprint(int flags)
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{
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static char result[1024];
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result[0] = '\0';
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if (flags & MIN_STAR)
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strlcat(result, ",min", sizeof(result));
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if (flags & HR_STAR)
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strlcat(result, ",hr", sizeof(result));
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if (flags & DOM_STAR)
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strlcat(result, ",dom", sizeof(result));
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if (flags & DOW_STAR)
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strlcat(result, ",dow", sizeof(result));
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if (flags & WHEN_REBOOT)
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strlcat(result, ",reboot", sizeof(result));
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if (flags & DONT_LOG)
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strlcat(result, ",nolog", sizeof(result));
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return result + (result[0] == ',');
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}
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static void
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printone(char *res, size_t len, const char *b)
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{
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int comma = strchr(b, ',') != NULL;
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if (comma)
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strlcat(res, "[", len);
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strlcat(res, b, len);
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strlcat(res, "]," + (comma ? 0 : 1), len);
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}
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static const char *
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tick(const entry *e)
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{
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static char result[1024];
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result[0] = '\0';
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printone(result, sizeof(result), bitprint(e->minute, MINUTE_COUNT));
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printone(result, sizeof(result), bitprint(e->hour, HOUR_COUNT));
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printone(result, sizeof(result), bitprint(e->dom, DOM_COUNT));
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printone(result, sizeof(result), bitprint(e->month, MONTH_COUNT));
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printone(result, sizeof(result), bitprint(e->dow, DOW_COUNT));
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strlcat(result, "flags=", sizeof(result));
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strlcat(result, flagsprint(e->flags), sizeof(result));
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return result;
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}
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static void
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find_jobs(time_t vtime, cron_db *db, int doWild, int doNonWild) {
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time_t virtualSecond = vtime * SECONDS_PER_MINUTE;
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struct tm *tm;
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int minute, hour, dom, month, dow;
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user *u;
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entry *e;
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#ifndef CRON_LOCALTIME
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char *orig_tz, *job_tz;
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#define maketime(tz1, tz2) do { \
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char *t = tz1; \
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if (t != NULL && *t != '\0') \
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setenv("TZ", t, 1); \
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else if ((tz2) != NULL) \
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setenv("TZ", (tz2), 1); \
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else \
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unsetenv("TZ"); \
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tzset(); \
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tm = localtime(&virtualSecond); \
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minute = tm->tm_min -FIRST_MINUTE; \
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hour = tm->tm_hour -FIRST_HOUR; \
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dom = tm->tm_mday -FIRST_DOM; \
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month = tm->tm_mon + 1 /* 0..11 -> 1..12 */ -FIRST_MONTH; \
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dow = tm->tm_wday -FIRST_DOW; \
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} while (/*CONSTCOND*/0)
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orig_tz = getenv("TZ");
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maketime(NULL, orig_tz);
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#else
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tm = gmtime(&virtualSecond);
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#endif
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Debug(DSCH, ("[%ld] tick(%d,%d,%d,%d,%d) %s %s\n",
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(long)getpid(), minute, hour, dom, month, dow,
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doWild?" ":"No wildcard",doNonWild?" ":"Wildcard only"));
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/* the dom/dow situation is odd. '* * 1,15 * Sun' will run on the
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* first and fifteenth AND every Sunday; '* * * * Sun' will run *only*
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* on Sundays; '* * 1,15 * *' will run *only* the 1st and 15th. this
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* is why we keep 'e->dow_star' and 'e->dom_star'. yes, it's bizarre.
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* like many bizarre things, it's the standard.
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*/
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for (u = db->head; u != NULL; u = u->next) {
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for (e = u->crontab; e != NULL; e = e->next) {
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#ifndef CRON_LOCALTIME
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job_tz = env_get("CRON_TZ", e->envp);
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maketime(job_tz, orig_tz);
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#else
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#define job_tz "N/A"
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#define orig_tz "N/A"
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#endif
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Debug(DSCH|DEXT, ("user [%s:%ld:%ld:...] "
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"[jobtz=%s, origtz=%s] "
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"tick(%s), cmd=\"%s\"\n",
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e->pwd->pw_name, (long)e->pwd->pw_uid,
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(long)e->pwd->pw_gid, job_tz, orig_tz,
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tick(e), e->cmd));
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if (bit_test(e->minute, minute) &&
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bit_test(e->hour, hour) &&
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bit_test(e->month, month) &&
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( ((e->flags & DOM_STAR) || (e->flags & DOW_STAR))
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? (bit_test(e->dow,dow) && bit_test(e->dom,dom))
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: (bit_test(e->dow,dow) || bit_test(e->dom,dom))
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)
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) {
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if ((doNonWild &&
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!(e->flags & (MIN_STAR|HR_STAR))) ||
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(doWild && (e->flags & (MIN_STAR|HR_STAR))))
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job_add(e, u, StartTime);
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}
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}
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}
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#ifndef CRON_LOCALTIME
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if (orig_tz != NULL)
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setenv("TZ", orig_tz, 1);
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else
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unsetenv("TZ");
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#endif
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}
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/*
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* Set StartTime and clockTime to the current time.
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* These are used for computing what time it really is right now.
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* Note that clockTime is a unix wallclock time converted to minutes.
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*/
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static void
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set_time(int initialize) {
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#ifdef CRON_LOCALTIME
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struct tm tm;
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static int isdst;
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StartTime = time(NULL);
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/* We adjust the time to GMT so we can catch DST changes. */
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tm = *localtime(&StartTime);
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if (initialize || tm.tm_isdst != isdst) {
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isdst = tm.tm_isdst;
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GMToff = get_gmtoff(&StartTime, &tm);
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Debug(DSCH, ("[%ld] GMToff=%ld\n",
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(long)getpid(), (long)GMToff));
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}
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#else
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StartTime = time(NULL);
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#endif
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clockTime = (StartTime + GMToff) / (time_t)SECONDS_PER_MINUTE;
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}
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/*
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* Try to just hit the next minute.
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*/
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static void
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cron_sleep(int target) {
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time_t t1, t2;
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int seconds_to_wait;
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t1 = time(NULL) + GMToff;
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seconds_to_wait = (int)(target * SECONDS_PER_MINUTE - t1);
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Debug(DSCH, ("[%ld] Target time=%lld, sec-to-wait=%d\n",
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(long)getpid(), (long long)target*SECONDS_PER_MINUTE,
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seconds_to_wait));
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while (seconds_to_wait > 0 && seconds_to_wait < 65) {
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(void)sleep((unsigned int) seconds_to_wait);
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/*
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* Check to see if we were interrupted by a signal.
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* If so, service the signal(s) then continue sleeping
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* where we left off.
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*/
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if (got_sighup) {
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got_sighup = 0;
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log_close();
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}
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if (got_sigchld) {
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got_sigchld = 0;
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sigchld_reaper();
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}
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t2 = time(NULL) + GMToff;
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seconds_to_wait -= (int)(t2 - t1);
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t1 = t2;
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}
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}
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/*ARGSUSED*/
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static void
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sighup_handler(int x __unused) {
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got_sighup = 1;
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}
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/*ARGSUSED*/
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static void
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sigchld_handler(int x __unused) {
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got_sigchld = 1;
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}
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/*ARGSUSED*/
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static void
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quit(int x __unused) {
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(void) unlink(_PATH_CRON_PID);
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_exit(0);
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}
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static void
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sigchld_reaper(void) {
|
|
WAIT_T waiter;
|
|
PID_T pid;
|
|
|
|
do {
|
|
pid = waitpid(-1, &waiter, WNOHANG);
|
|
switch (pid) {
|
|
case -1:
|
|
if (errno == EINTR)
|
|
continue;
|
|
Debug(DPROC,
|
|
("[%ld] sigchld...no children\n",
|
|
(long)getpid()));
|
|
break;
|
|
case 0:
|
|
Debug(DPROC,
|
|
("[%ld] sigchld...no dead kids\n",
|
|
(long)getpid()));
|
|
break;
|
|
default:
|
|
Debug(DPROC,
|
|
("[%ld] sigchld...pid #%ld died, stat=%d\n",
|
|
(long)getpid(), (long)pid, WEXITSTATUS(waiter)));
|
|
break;
|
|
}
|
|
} while (pid > 0);
|
|
}
|
|
|
|
static void
|
|
parse_args(int argc, char *argv[]) {
|
|
int argch;
|
|
|
|
while (-1 != (argch = getopt(argc, argv, "nx:"))) {
|
|
switch (argch) {
|
|
default:
|
|
usage();
|
|
break;
|
|
case 'x':
|
|
if (!set_debug_flags(optarg))
|
|
usage();
|
|
break;
|
|
case 'n':
|
|
NoFork = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|