465 lines
10 KiB
C
465 lines
10 KiB
C
/* cron 1.4 - clock daemon Author: Kees J. Bot
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* 7 Dec 1996
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*/
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#define _MINIX_SOURCE
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#define _MINIX 1
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#define nil ((void*)0)
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <limits.h>
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#include <dirent.h>
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#include <time.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <grp.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include "misc.h"
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#include "tab.h"
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#if __minix && !__minix_vmd
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#define initgroups(name, gid) (0)
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#endif
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static volatile int busy; /* Set when something is afoot, don't sleep! */
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static volatile int need_reload;/* Set if table reload required. */
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static volatile int need_quit; /* Set if cron must exit. */
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static volatile int debug; /* Debug level. */
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static void run_job(cronjob_t *job)
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/* Execute a cron job. Register its pid in the job structure. If a job's
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* crontab has an owner then its output is mailed to that owner, otherwise
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* no special provisions are made, so the output will go where cron's output
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* goes. This keeps root's mailbox from filling up.
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*/
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{
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pid_t pid;
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int need_mailer;
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int mailfd[2], errfd[2];
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struct passwd *pw;
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crontab_t *tab= job->tab;
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need_mailer= (tab->user != nil);
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if (job->atjob) {
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struct stat st;
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need_mailer= 1;
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if (rename(tab->file, tab->data) < 0) {
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if (errno == ENOENT) {
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/* Normal error, job deleted. */
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need_reload= 1;
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} else {
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/* Bad error, halt processing AT jobs. */
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log(LOG_CRIT, "Can't rename %s: %s\n",
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tab->file, strerror(errno));
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tab_reschedule(job);
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}
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return;
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}
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/* Will need to determine the next AT job. */
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need_reload= 1;
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if (stat(tab->data, &st) < 0) {
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log(LOG_ERR, "Can't stat %s: %s\n",
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tab->data, strerror(errno));
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tab_reschedule(job);
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return;
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}
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if ((pw= getpwuid(st.st_uid)) == nil) {
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log(LOG_ERR, "Unknown owner for uid %lu of AT job %s\n",
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(unsigned long) st.st_uid, job->cmd);
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tab_reschedule(job);
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return;
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}
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} else {
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pw= nil;
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if (job->user != nil && (pw= getpwnam(job->user)) == nil) {
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log(LOG_ERR, "%s: Unknown user\n", job->user);
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tab_reschedule(job);
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return;
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}
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}
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if (need_mailer) {
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errfd[0]= -1;
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if (pipe(errfd) < 0 || pipe(mailfd) < 0) {
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log(LOG_ERR, "pipe() call failed: %s\n",
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strerror(errno));
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if (errfd[0] != -1) {
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close(errfd[0]);
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close(errfd[1]);
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}
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tab_reschedule(job);
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return;
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}
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(void) fcntl(errfd[1], F_SETFD,
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fcntl(errfd[1], F_GETFD) | FD_CLOEXEC);
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if ((pid= fork()) == -1) {
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log(LOG_ERR, "fork() call failed: %s\n",
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strerror(errno));
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close(errfd[0]);
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close(errfd[1]);
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close(mailfd[0]);
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close(mailfd[1]);
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tab_reschedule(job);
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return;
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}
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if (pid == 0) {
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/* Child that is to be the mailer. */
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char subject[70+20], *ps;
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close(errfd[0]);
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close(mailfd[1]);
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if (mailfd[0] != 0) {
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dup2(mailfd[0], 0);
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close(mailfd[0]);
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}
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memset(subject, 0, sizeof(subject));
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sprintf(subject,
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"Output from your %s job: %.50s",
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job->atjob ? "AT" : "cron",
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job->cmd);
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if (subject[70] != 0) {
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strcpy(subject+70-3, "...");
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}
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for (ps= subject; *ps != 0; ps++) {
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if (*ps == '\n') *ps= '%';
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}
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execl("/usr/bin/mail", "mail", "-s", subject,
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pw->pw_name, (char *) nil);
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write(errfd[1], &errno, sizeof(errno));
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_exit(1);
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}
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close(mailfd[0]);
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close(errfd[1]);
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if (read(errfd[0], &errno, sizeof(errno)) > 0) {
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log(LOG_ERR, "can't execute /usr/bin/mail: %s\n",
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strerror(errno));
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close(errfd[0]);
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close(mailfd[1]);
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tab_reschedule(job);
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return;
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}
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close(errfd[0]);
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}
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if (pipe(errfd) < 0) {
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log(LOG_ERR, "pipe() call failed: %s\n", strerror(errno));
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if (need_mailer) close(mailfd[1]);
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tab_reschedule(job);
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return;
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}
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(void) fcntl(errfd[1], F_SETFD, fcntl(errfd[1], F_GETFD) | FD_CLOEXEC);
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if ((pid= fork()) == -1) {
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log(LOG_ERR, "fork() call failed: %s\n", strerror(errno));
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close(errfd[0]);
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close(errfd[1]);
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if (need_mailer) close(mailfd[1]);
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tab_reschedule(job);
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return;
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}
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if (pid == 0) {
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/* Child that is to be the cron job. */
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close(errfd[0]);
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if (need_mailer) {
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if (mailfd[1] != 1) {
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dup2(mailfd[1], 1);
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close(mailfd[1]);
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}
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dup2(1, 2);
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}
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if (pw != nil) {
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/* Change id to the owner of the job. */
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initgroups(pw->pw_name, pw->pw_gid);
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setgid(pw->pw_gid);
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setuid(pw->pw_uid);
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chdir(pw->pw_dir);
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if (setenv("USER", pw->pw_name, 1) < 0) goto bad;
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if (setenv("LOGNAME", pw->pw_name, 1) < 0) goto bad;
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if (setenv("HOME", pw->pw_dir, 1) < 0) goto bad;
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if (setenv("SHELL", pw->pw_shell[0] == 0 ? "/bin/sh"
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: pw->pw_shell, 1) < 0) goto bad;
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}
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if (job->atjob) {
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execl("/bin/sh", "sh", tab->data, (char *) nil);
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} else {
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execl("/bin/sh", "sh", "-c", job->cmd, (char *) nil);
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}
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bad:
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write(errfd[1], &errno, sizeof(errno));
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_exit(1);
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}
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if (need_mailer) close(mailfd[1]);
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close(errfd[1]);
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if (read(errfd[0], &errno, sizeof(errno)) > 0) {
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log(LOG_ERR, "can't execute /bin/sh: %s\n", strerror(errno));
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close(errfd[0]);
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tab_reschedule(job);
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return;
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}
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close(errfd[0]);
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job->pid= pid;
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if (debug >= 1) fprintf(stderr, "executing >%s<, pid = %ld\n",
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job->cmd, (long) job->pid);
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}
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static void load_crontabs(void)
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/* Load all the crontabs we like to run. We didn't bother to make a list in
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* an array or something, this is too system specific to make nice.
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*/
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{
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DIR *spool;
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#if __minix_vmd
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FILE *pkgs;
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#endif
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tab_parse("/usr/lib/crontab", nil);
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tab_parse("/usr/local/lib/crontab", nil);
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tab_parse("/var/lib/crontab", nil);
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#if __minix_vmd
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if ((pkgs= fopen("/usr/lib/packages", "r")) != nil) {
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char name[NAME_MAX+1];
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char *np;
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int c;
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char tab[sizeof("/var/opt//lib/crontab") + NAME_MAX];
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while ((c= fgetc(pkgs)) != EOF) {
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np= name;
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while (c != EOF && c != '/' && c != '\n') {
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if (np < name+NAME_MAX) *np++ = c;
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c= fgetc(pkgs);
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}
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*np= 0;
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while (c != EOF && c != '\n') c= fgetc(pkgs);
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if (name[0] == 0) continue; /* ? */
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strcpy(tab, "/var/opt/");
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strcat(tab, name);
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strcat(tab, "/lib/crontab");
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tab_parse(tab, nil);
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}
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if (ferror(pkgs)) {
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log(LOG_CRIT, "/usr/lib/packages: %s\n",
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strerror(errno));
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}
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fclose(pkgs);
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} else {
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if (errno != ENOENT) {
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log(LOG_ERR, "/usr/lib/packages: %s\n",
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strerror(errno));
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}
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}
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#endif /* Minix-vmd */
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if ((spool= opendir("/usr/spool/crontabs")) != nil) {
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struct dirent *entry;
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char tab[sizeof("/usr/spool/crontabs/") + NAME_MAX];
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while ((entry= readdir(spool)) != nil) {
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if (entry->d_name[0] == '.') continue;
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strcpy(tab, "/usr/spool/crontabs/");
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strcat(tab, entry->d_name);
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tab_parse(tab, entry->d_name);
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}
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closedir(spool);
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}
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/* Find the first to be executed AT job. */
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tab_find_atjob("/usr/spool/at");
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tab_purge();
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if (debug >= 2) {
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tab_print(stderr);
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fprintf(stderr, "%lu memory chunks in use\n",
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(unsigned long) alloc_count);
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}
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}
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static void handler(int sig)
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{
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switch (sig) {
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case SIGHUP:
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need_reload= 1;
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break;
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case SIGINT:
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case SIGTERM:
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need_quit= 1;
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break;
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case SIGUSR1:
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debug++;
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break;
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case SIGUSR2:
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debug= 0;
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break;
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}
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alarm(1); /* A signal may come just before a blocking call. */
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busy= 1;
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}
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static void usage(void)
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{
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fprintf(stderr, "Usage: %s [-d[#]]\n", prog_name);
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exit(1);
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}
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int main(int argc, char **argv)
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{
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int i;
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struct sigaction sa, osa;
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FILE *pf;
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int r;
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prog_name= strrchr(argv[0], '/');
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if (prog_name == nil) prog_name= argv[0]; else prog_name++;
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i= 1;
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while (i < argc && argv[i][0] == '-') {
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char *opt= argv[i++] + 1;
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if (opt[0] == '-' && opt[1] == 0) break; /* -- */
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while (*opt != 0) switch (*opt++) {
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case 'd':
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if (*opt == 0) {
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debug= 1;
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} else {
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debug= strtoul(opt, &opt, 10);
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if (*opt != 0) usage();
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}
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break;
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default:
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usage();
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}
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}
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if (i != argc) usage();
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selectlog(SYSLOG);
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openlog(prog_name, LOG_PID, LOG_DAEMON);
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setlogmask(LOG_UPTO(LOG_INFO));
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/* Save process id. */
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if ((pf= fopen(PIDFILE, "w")) == NULL) {
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fprintf(stderr, "%s: %s\n", PIDFILE, strerror(errno));
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exit(1);
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}
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fprintf(pf, "%d\n", getpid());
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if (ferror(pf) || fclose(pf) == EOF) {
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fprintf(stderr, "%s: %s\n", PIDFILE, strerror(errno));
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exit(1);
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}
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sigemptyset(&sa.sa_mask);
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sa.sa_flags= 0;
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sa.sa_handler= handler;
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/* Hangup: Reload crontab files. */
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sigaction(SIGHUP, &sa, nil);
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/* User signal 1 & 2: Raise or reset debug level. */
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sigaction(SIGUSR1, &sa, nil);
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sigaction(SIGUSR2, &sa, nil);
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/* Interrupt and Terminate: Cleanup and exit. */
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if (sigaction(SIGINT, nil, &osa) == 0 && osa.sa_handler != SIG_IGN) {
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sigaction(SIGINT, &sa, nil);
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}
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if (sigaction(SIGTERM, nil, &osa) == 0 && osa.sa_handler != SIG_IGN) {
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sigaction(SIGTERM, &sa, nil);
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}
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/* Alarm: Wake up and run a job. */
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sigaction(SIGALRM, &sa, nil);
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/* Initialize current time and time next to do something. */
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time(&now);
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next= NEVER;
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/* Table load required first time. */
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need_reload= 1;
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do {
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if (need_reload) {
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need_reload= 0;
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load_crontabs();
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busy= 1;
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}
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/* Run jobs whose time has come. */
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if (next <= now) {
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cronjob_t *job;
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if ((job= tab_nextjob()) != nil) run_job(job);
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busy= 1;
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}
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if (busy) {
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/* Did a job finish? */
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r= waitpid(-1, nil, WNOHANG);
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busy= 0;
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} else {
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/* Sleep until the next job must be started. */
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if (next == NEVER) {
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alarm(0);
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} else {
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#if __minix_vmd
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struct timeval tvnext;
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tvnext.tv_sec= next;
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tvnext.tv_usec= 0;
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sysutime(UTIME_SETALARM, &tvnext);
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#else
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alarm((next - now) > INT_MAX
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? INT_MAX : (next - now));
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#endif
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}
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if (debug >= 1) fprintf(stderr, "%s: sleep until %s",
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prog_name, ctime(&next));
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closelog(); /* Don't keep resources open. */
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/* Wait for a job to exit or a timeout. */
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r= waitpid(-1, nil, 0);
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if (r == -1 && errno == ECHILD) pause();
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alarm(0);
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time(&now);
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}
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if (r > 0) {
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/* A job has finished, reschedule it. */
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if (debug >= 1) fprintf(stderr, "pid %d has exited\n",
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r);
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tab_reap_job((pid_t) r);
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busy= 1;
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}
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} while (!need_quit);
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/* Remove the pid file to signal that cron is gone. */
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unlink(PIDFILE);
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return 0;
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}
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/*
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* $PchId: cron.c,v 1.4 2000/07/17 19:00:35 philip Exp $
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*/
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