Import crond from http://git.2f30.org/scron/tree/
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LICENSE
1
LICENSE
@ -30,6 +30,7 @@ MIT/X Consortium License
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© 2014 Jeffrey Picard <jeff@jeffreypicard.com>
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© 2014 Evan Gates <evan.gates@gmail.com>
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© 2014 Michael Forney <mforney@mforney.org>
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© 2014 Ari Malinen <ari.malinen@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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530
crond.c
Normal file
530
crond.c
Normal file
@ -0,0 +1,530 @@
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/* See LICENSE file for copyright and license details. */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include "arg.h"
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#include "queue.h"
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#define VERSION "0.3.2"
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#define LEN(x) (sizeof (x) / sizeof *(x))
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struct field {
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/* [low, high] */
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long low;
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long high;
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/* for every `div' units */
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long div;
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};
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struct ctabentry {
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struct field min;
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struct field hour;
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struct field mday;
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struct field mon;
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struct field wday;
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char *cmd;
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TAILQ_ENTRY(ctabentry) entry;
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};
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struct jobentry {
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char *cmd;
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pid_t pid;
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TAILQ_ENTRY(jobentry) entry;
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};
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char *argv0;
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static sig_atomic_t chldreap;
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static sig_atomic_t reload;
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static sig_atomic_t quit;
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static TAILQ_HEAD(, ctabentry) ctabhead = TAILQ_HEAD_INITIALIZER(ctabhead);
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static TAILQ_HEAD(, jobentry) jobhead = TAILQ_HEAD_INITIALIZER(jobhead);
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static char *config = "/etc/crontab";
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static char *pidfile = "/var/run/crond.pid";
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static int nflag;
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static void
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loginfo(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (nflag == 0)
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vsyslog(LOG_INFO, fmt, ap);
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else
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vfprintf(stdout, fmt, ap);
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fflush(stdout);
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va_end(ap);
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}
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static void
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logwarn(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (nflag == 0)
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vsyslog(LOG_WARNING, fmt, ap);
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else
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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}
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static void
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logerr(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (nflag == 0)
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vsyslog(LOG_ERR, fmt, ap);
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else
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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}
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static void *
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emalloc(size_t size)
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{
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void *p;
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p = malloc(size);
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if (!p) {
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logerr("error: out of memory\n");
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if (nflag == 0)
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unlink(pidfile);
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exit(EXIT_FAILURE);
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}
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return p;
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}
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static char *
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estrdup(const char *s)
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{
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char *p;
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p = strdup(s);
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if (!p) {
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logerr("error: out of memory\n");
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if (nflag == 0)
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unlink(pidfile);
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exit(EXIT_FAILURE);
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}
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return p;
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}
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static void
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runjob(char *cmd)
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{
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struct jobentry *je;
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time_t t;
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pid_t pid;
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t = time(NULL);
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/* If command is already running, skip it */
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TAILQ_FOREACH(je, &jobhead, entry) {
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if (strcmp(je->cmd, cmd) == 0) {
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loginfo("already running %s pid: %d at %s",
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je->cmd, je->pid, ctime(&t));
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return;
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}
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}
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pid = fork();
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if (pid < 0) {
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logerr("error: failed to fork job: %s time: %s",
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cmd, ctime(&t));
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return;
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} else if (pid == 0) {
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setsid();
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loginfo("run: %s pid: %d at %s",
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cmd, getpid(), ctime(&t));
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execl("/bin/sh", "/bin/sh", "-c", cmd, (char *)NULL);
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logerr("error: failed to execute job: %s time: %s",
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cmd, ctime(&t));
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_exit(EXIT_FAILURE);
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} else {
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je = emalloc(sizeof(*je));
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je->cmd = estrdup(cmd);
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je->pid = pid;
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TAILQ_INSERT_TAIL(&jobhead, je, entry);
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}
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}
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static void
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waitjob(void)
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{
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struct jobentry *je, *tmp;
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int status;
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time_t t;
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pid_t pid;
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t = time(NULL);
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while ((pid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
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je = NULL;
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TAILQ_FOREACH(tmp, &jobhead, entry) {
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if (tmp->pid == pid) {
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je = tmp;
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break;
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}
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}
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if (je) {
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TAILQ_REMOVE(&jobhead, je, entry);
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free(je->cmd);
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free(je);
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}
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if (WIFEXITED(status) == 1)
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loginfo("complete: pid: %d returned: %d time: %s",
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pid, WEXITSTATUS(status), ctime(&t));
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else if (WIFSIGNALED(status) == 1)
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loginfo("complete: pid: %d terminated by signal: %s time: %s",
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pid, strsignal(WTERMSIG(status)), ctime(&t));
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else if (WIFSTOPPED(status) == 1)
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loginfo("complete: pid: %d stopped by signal: %s time: %s",
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pid, strsignal(WSTOPSIG(status)), ctime(&t));
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}
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}
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static int
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isleap(int year)
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{
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if (year % 400 == 0)
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return 1;
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if (year % 100 == 0)
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return 0;
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return (year % 4 == 0);
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}
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static int
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daysinmon(int mon, int year)
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{
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int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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if (year < 1900)
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year += 1900;
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if (isleap(year))
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days[1] = 29;
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return days[mon];
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}
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static int
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matchentry(struct ctabentry *cte, struct tm *tm)
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{
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struct {
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struct field *f;
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int tm;
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int len;
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} matchtbl[] = {
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{ .f = &cte->min, .tm = tm->tm_min, .len = 60 },
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{ .f = &cte->hour, .tm = tm->tm_hour, .len = 24 },
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{ .f = &cte->mday, .tm = tm->tm_mday, .len = daysinmon(tm->tm_mon, tm->tm_year) },
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{ .f = &cte->mon, .tm = tm->tm_mon, .len = 12 },
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{ .f = &cte->wday, .tm = tm->tm_wday, .len = 7 },
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};
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size_t i;
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for (i = 0; i < LEN(matchtbl); i++) {
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if (matchtbl[i].f->high == -1) {
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if (matchtbl[i].f->low == -1) {
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continue;
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} else if (matchtbl[i].f->div > 0) {
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if (matchtbl[i].tm > 0) {
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if (matchtbl[i].tm % matchtbl[i].f->div == 0)
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continue;
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} else {
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if (matchtbl[i].len % matchtbl[i].f->div == 0)
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continue;
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}
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} else if (matchtbl[i].f->low == matchtbl[i].tm) {
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continue;
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}
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} else if (matchtbl[i].f->low <= matchtbl[i].tm &&
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matchtbl[i].f->high >= matchtbl[i].tm) {
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continue;
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}
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break;
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}
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if (i != LEN(matchtbl))
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return 0;
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return 1;
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}
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static int
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parsefield(const char *field, long low, long high, struct field *f)
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{
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long min, max, div;
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char *e1, *e2;
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if (strcmp(field, "*") == 0) {
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f->low = -1;
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f->high = -1;
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return 0;
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}
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div = -1;
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max = -1;
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min = strtol(field, &e1, 10);
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switch (e1[0]) {
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case '-':
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e1++;
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errno = 0;
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max = strtol(e1, &e2, 10);
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if (e2[0] != '\0' || errno != 0)
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return -1;
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break;
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case '*':
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e1++;
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if (e1[0] != '/')
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return -1;
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e1++;
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errno = 0;
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div = strtol(e1, &e2, 10);
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if (e2[0] != '\0' || errno != 0)
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return -1;
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break;
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case '\0':
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break;
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default:
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return -1;
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}
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if (min < low || min > high)
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return -1;
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if (max != -1)
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if (max < low || max > high)
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return -1;
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if (div != -1)
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if (div < low || div > high)
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return -1;
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f->low = min;
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f->high = max;
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f->div = div;
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return 0;
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}
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static void
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unloadentries(void)
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{
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struct ctabentry *cte, *tmp;
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for (cte = TAILQ_FIRST(&ctabhead); cte; cte = tmp) {
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tmp = TAILQ_NEXT(cte, entry);
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TAILQ_REMOVE(&ctabhead, cte, entry);
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free(cte->cmd);
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free(cte);
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}
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}
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static int
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loadentries(void)
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{
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struct ctabentry *cte;
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FILE *fp;
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char *line = NULL, *p, *col;
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int r = 0, y;
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size_t size = 0;
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ssize_t len;
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if ((fp = fopen(config, "r")) == NULL) {
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logerr("error: can't open %s: %s\n", config, strerror(errno));
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return -1;
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}
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for (y = 0; (len = getline(&line, &size, fp)) != -1; y++) {
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p = line;
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if (line[0] == '#' || line[0] == '\n' || line[0] == '\0')
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continue;
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cte = emalloc(sizeof(*cte));
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col = strsep(&p, "\t");
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if (!col || parsefield(col, 0, 59, &cte->min) < 0) {
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logerr("error: failed to parse `min' field on line %d\n",
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y + 1);
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free(cte);
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r = -1;
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break;
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}
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col = strsep(&p, "\t");
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if (!col || parsefield(col, 0, 23, &cte->hour) < 0) {
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logerr("error: failed to parse `hour' field on line %d\n",
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y + 1);
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free(cte);
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r = -1;
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break;
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}
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col = strsep(&p, "\t");
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if (!col || parsefield(col, 1, 31, &cte->mday) < 0) {
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logerr("error: failed to parse `mday' field on line %d\n",
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y + 1);
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free(cte);
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r = -1;
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break;
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}
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col = strsep(&p, "\t");
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if (!col || parsefield(col, 1, 12, &cte->mon) < 0) {
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logerr("error: failed to parse `mon' field on line %d\n",
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y + 1);
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free(cte);
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r = -1;
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break;
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}
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col = strsep(&p, "\t");
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if (!col || parsefield(col, 0, 6, &cte->wday) < 0) {
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logerr("error: failed to parse `wday' field on line %d\n",
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y + 1);
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free(cte);
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r = -1;
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break;
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}
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col = strsep(&p, "\n");
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if (!col) {
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logerr("error: missing `cmd' field on line %d\n",
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y + 1);
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free(cte);
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r = -1;
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break;
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}
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cte->cmd = estrdup(col);
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TAILQ_INSERT_TAIL(&ctabhead, cte, entry);
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}
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if (r < 0)
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unloadentries();
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free(line);
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fclose(fp);
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return r;
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}
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static void
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reloadentries(void)
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{
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unloadentries();
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if (loadentries() < 0)
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logwarn("warning: discarding old crontab entries\n");
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}
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static void
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sighandler(int sig)
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{
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switch (sig) {
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case SIGCHLD:
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chldreap = 1;
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break;
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case SIGHUP:
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reload = 1;
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break;
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case SIGTERM:
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quit = 1;
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break;
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}
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-f file] [-n]\n", argv0);
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fprintf(stderr, " -f config file\n");
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fprintf(stderr, " -n do not daemonize\n");
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exit(EXIT_FAILURE);
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}
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int
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main(int argc, char *argv[])
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{
|
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FILE *fp;
|
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struct ctabentry *cte;
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time_t t;
|
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struct tm *tm;
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struct sigaction sa;
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ARGBEGIN {
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case 'n':
|
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nflag = 1;
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break;
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||||
case 'f':
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config = EARGF(usage());
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break;
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default:
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usage();
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} ARGEND;
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|
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if (argc > 0)
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usage();
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|
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if (nflag == 0) {
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openlog(argv[0], LOG_CONS | LOG_PID, LOG_CRON);
|
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if (daemon(1, 0) < 0) {
|
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logerr("error: failed to daemonize %s\n", strerror(errno));
|
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return EXIT_FAILURE;
|
||||
}
|
||||
if ((fp = fopen(pidfile, "w"))) {
|
||||
fprintf(fp, "%d\n", getpid());
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fclose(fp);
|
||||
}
|
||||
}
|
||||
|
||||
sa.sa_handler = sighandler;
|
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sigfillset(&sa.sa_mask);
|
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sa.sa_flags = SA_RESTART;
|
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sigaction(SIGCHLD, &sa, NULL);
|
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sigaction(SIGHUP, &sa, NULL);
|
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sigaction(SIGTERM, &sa, NULL);
|
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|
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loadentries();
|
||||
|
||||
while (1) {
|
||||
t = time(NULL);
|
||||
sleep(60 - t % 60);
|
||||
|
||||
if (quit == 1) {
|
||||
if (nflag == 0)
|
||||
unlink(pidfile);
|
||||
unloadentries();
|
||||
/* Don't wait or kill forked processes, just exit */
|
||||
break;
|
||||
}
|
||||
|
||||
if (reload == 1 || chldreap == 1) {
|
||||
if (reload == 1) {
|
||||
reloadentries();
|
||||
reload = 0;
|
||||
}
|
||||
if (chldreap == 1) {
|
||||
waitjob();
|
||||
chldreap = 0;
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
TAILQ_FOREACH(cte, &ctabhead, entry) {
|
||||
t = time(NULL);
|
||||
tm = localtime(&t);
|
||||
if (matchentry(cte, tm) == 1)
|
||||
runjob(cte->cmd);
|
||||
}
|
||||
}
|
||||
|
||||
if (nflag == 0)
|
||||
closelog();
|
||||
|
||||
return EXIT_SUCCESS;
|
||||
}
|
Loading…
Reference in New Issue
Block a user