--- /dev/null
+/*
+ * FCRON - periodic command scheduler
+ *
+ * Copyright 2000-2001 Thibault Godouet <fcron@free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * The GNU General Public License can also be found in the file
+ * `LICENSE' that comes with the fcron source distribution.
+ */
+
+ /* $Id: fcronsighup.c,v 1.1 2001-07-07 17:29:51 thib Exp $ */
+
+#include "global.h"
+
+/* log.c */
+#include "log.h"
+#include "subs.h"
+#include "allow.h"
+
+char rcs_info[] = "$Id: fcronsighup.c,v 1.1 2001-07-07 17:29:51 thib Exp $";
+
+void usage(void);
+void sig_daemon(void);
+pid_t read_pid(void);
+
+uid_t uid = 0;
+
+/* used in temp_file() */
+char *tmp_path = "/tmp/";
+
+#ifdef DEBUG
+char debug_opt = 1; /* set to 1 if we are in debug mode */
+#else
+char debug_opt = 0; /* set to 1 if we are in debug mode */
+#endif
+
+/* needed by log part : */
+char *prog_name = NULL;
+char foreground = 1;
+pid_t daemon_pid = 0;
+
+
+void
+usage(void)
+ /* print a help message about command line options and exit */
+{
+ fprintf(stderr,
+ "fcronsighup "VERSION_QUOTED" - make fcron update its fcrontabs\n"
+ "Copyright 2000-2001 Thibault Godouet <fcron@free.fr>\n"
+ "This program is free software distributed WITHOUT ANY WARRANTY.\n"
+ "See the GNU General Public License for more details.\n"
+ "\n"
+ );
+
+ fprintf(stderr,
+ "fcronsighup [fcronconf]\n"
+ " Signal fcron process using fcronconf configuration file\n"
+ " (or default configuration file " ETC "/" FCRON_CONF").\n"
+ "\n"
+ );
+
+ exit(EXIT_ERR);
+
+}
+
+pid_t
+read_pid(void)
+ /* return fcron daemon's pid if running.
+ * otherwise return 0 */
+{
+ FILE *fp = NULL;
+ pid_t pid = 0;
+
+ if ((fp = fopen(pidfile, "r")) != NULL) {
+ fscanf(fp, "%d", (int *) &pid);
+ fclose(fp);
+ }
+
+ return pid;
+}
+
+
+void
+sig_daemon(void)
+ /* send SIGHUP to daemon to tell him configuration has changed */
+ /* SIGHUP is sent once 10s before the next minute to avoid
+ * some bad users to block daemon by sending it SIGHUP all the time */
+{
+ /* we don't need to make root wait */
+ if (uid != 0) {
+ time_t t = 0;
+ int sl = 0;
+ FILE *fp = NULL;
+ int fd = 0;
+ struct tm *tm = NULL;
+ char sigfile[PATH_LEN];
+ char buf[FNAME_LEN];
+
+ t = time(NULL);
+ tm = localtime(&t);
+
+ if ( (sl = 60 - (t % 60) - 10) < 0 ) {
+ if ( (tm->tm_min = tm->tm_min + 2) >= 60 ) {
+ tm->tm_hour++;
+ tm->tm_min -= 60;
+ }
+ snprintf(buf, sizeof(buf), "%02dh%02d", tm->tm_hour, tm->tm_min);
+ sl = 60 - (t % 60) + 50;
+ } else {
+ if ( ++tm->tm_min >= 60 ) {
+ tm->tm_hour++;
+ tm->tm_min -= 60;
+ }
+ snprintf(buf, sizeof(buf), "%02dh%02d", tm->tm_hour, tm->tm_min);
+ }
+ fprintf(stderr, "Modifications will be taken into account"
+ " at %s.\n", buf);
+
+ snprintf(sigfile, sizeof(sigfile), "%s/fcrontab.sig", fcrontabs);
+
+ switch ( fork() ) {
+ case -1:
+ remove(sigfile);
+ die_e("could not fork : daemon has not been signaled");
+ break;
+ case 0:
+ /* child */
+ break;
+ default:
+ /* parent */
+ return;
+ }
+
+ foreground = 0;
+
+ /* try to create a lock file */
+ if ((fd = open(sigfile, O_RDWR|O_CREAT, 0644)) == -1
+ || ((fp = fdopen(fd, "r+")) == NULL) )
+ die_e("can't open or create %s", sigfile);
+
+#ifdef HAVE_FLOCK
+ if ( flock(fd, LOCK_EX|LOCK_NB) != 0 ) {
+ debug("fcrontab is already waiting for signalling the daemon :"
+ " exiting.");
+ return;
+ }
+#else /* HAVE_FLOCK */
+ if ( lockf(fd, F_TLOCK, 0) != 0 ) {
+ debug("fcrontab is already waiting for signalling the daemon :"
+ " exiting.");
+ return;
+ }
+#endif /* ! HAVE_FLOCK */
+
+ sleep(sl);
+
+ fclose(fp);
+ close(fd);
+
+ remove(sigfile);
+ }
+ else
+ fprintf(stderr, "Modifications will be taken into account"
+ " right now.\n");
+
+ if ( (daemon_pid = read_pid()) == 0 )
+ /* daemon is not running any longer : we exit */
+ return ;
+
+ foreground = 1;
+
+ if ( kill(daemon_pid, SIGHUP) != 0)
+ die_e("could not send SIGHUP to daemon (pid %d)", daemon_pid);
+
+}
+
+
+int
+main(int argc, char **argv)
+{
+ struct passwd *pass;
+
+ if (strrchr(argv[0],'/')==NULL) prog_name = argv[0];
+ else prog_name = strrchr(argv[0],'/')+1;
+
+ if ( argc == 2 )
+ fcronconf = argv[1];
+ else if (argc > 2 )
+ usage();
+
+ /* read fcron.conf and update global parameters */
+ read_conf();
+
+ uid = getuid();
+
+ /* check if user is allowed to use this program */
+ if ( ! (pass = getpwuid(uid)) )
+ die("user \"%s\" is not in passwd file. Aborting.", USERNAME);
+
+ if ( is_allowed(pass->pw_name) ) {
+ /* check if daemon is running */
+ if ( (daemon_pid = read_pid()) != 0 )
+ sig_daemon();
+ else
+ fprintf(stderr, "fcron is not running :\n modifications will"
+ " be taken into account at its next execution.\n");
+ }
+ else
+ die("User \"%s\" is not allowed to use %s. Aborting.",
+ pass->pw_name, prog_name);
+
+ return EXIT_OK;
+
+}
projects / fcron / commitdiff