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Server : Apache System : Linux profile 3.10.0-1160.88.1.el7.x86_64 #1 SMP Tue Mar 7 15:41:52 UTC 2023 x86_64 User : apache ( 48) PHP Version : 8.0.28 Disable Function : NONE Directory : /Data/.backup/script/fcron-3.2.0/ |
/*
* FCRON - periodic command scheduler
*
* Copyright 2000-2014 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.
*/
#include "fcronsighup.h"
#include "global.h"
#include "allow.h"
#include "fcronconf.h"
void usage(void);
void sig_daemon(void);
pid_t read_pid(void);
uid_t uid = 0;
uid_t fcrontab_uid = 0;
uid_t rootuid = 0;
gid_t rootgid = 0;
/* 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 " COPYRIGHT_QUOTED " 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) {
if (fscanf(fp, "%" ATTR_SIZE_PIDT "d", CAST_PIDT_PTR & pid) < 1)
error("Unable to read fcron daemon's pid (fscanf(fp,...))");
xfclose_check(&fp, pidfile);
}
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 != rootuid) {
time_t t = 0;
int sl = 0;
FILE *fp = NULL;
int fd = 0;
struct tm *tm = NULL;
char sigfile[PATH_LEN];
char buf[PATH_LEN];
sigfile[0] = '\0';
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), "%02d:%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), "%02d:%02d", tm->tm_hour, tm->tm_min);
}
fprintf(stderr, "Modifications will be taken into account"
" at %s.\n", buf);
/* if fcrontabs is too long, snprintf will not be able to add "/fcrontab.sig"
* string at the end of sigfile */
if (strlen(fcrontabs) > (sizeof(sigfile) - sizeof("/fcrontab.sig")))
die("fcrontabs string too long (more than %d characters)",
(sizeof(sigfile) - sizeof("/fcrontab.sig")));
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 */
/* // */
debug("uid: %d, euid: %d, gid: %d, egid: %d", getuid(), geteuid(),
getgid(), getegid());
/* // */
fd = open(sigfile, O_RDWR | O_CREAT, 0644);
if (fd == -1)
die_e("can't open or create %s", sigfile);
fp = fdopen(fd, "r+");
if (fp == NULL)
die_e("can't fdopen %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);
/* also closes the underlying file descriptor fd: */
xfclose_check(&fp, sigfile);
/* also reset fd, now closed by xfclose_check(), to make it clear it is closed */
fd = -1;
if (remove(sigfile) < 0)
error_e("Could not remove %s");
}
else
/* we are root */
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;
#ifdef USE_SETE_ID
if (seteuid(rootuid) != 0)
error_e("seteuid(rootuid)");
#endif /* USE_SETE_ID */
if (kill(daemon_pid, SIGHUP) != 0)
die_e("could not send SIGHUP to daemon (pid %d)", daemon_pid);
#ifdef USE_SETE_ID
/* get user's permissions */
if (seteuid(fcrontab_uid) != 0)
die_e("Could not change euid to " USERNAME "[%d]", uid);
#endif /* USE_SETE_ID */
}
int
main(int argc, char **argv)
{
struct passwd *pass = NULL;
char *cur_user = NULL;
rootuid = get_user_uid_safe(ROOTNAME);
rootgid = get_group_gid_safe(ROOTGROUP);
if (strrchr(argv[0], '/') == NULL)
prog_name = argv[0];
else
prog_name = strrchr(argv[0], '/') + 1;
fcrontab_uid = get_user_uid_safe(USERNAME);
#ifdef USE_SETE_ID
/* get user's permissions */
if (seteuid(fcrontab_uid) != 0)
die_e("Could not change euid to " USERNAME "[%d]", uid);
#endif /* USE_SETE_ID */
if (argc == 2)
fcronconf = argv[1];
else if (argc > 2)
usage();
/* read fcron.conf and update global parameters */
/* We deactivate output to console, because otherwise it may be used
* by a malicious user to read some data it is not allow to read
* (fcronsighup is suid root) */
foreground = 0;
read_conf();
foreground = 1;
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);
cur_user = strdup2(pass->pw_name);
if (is_allowed(cur_user)) {
/* 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.", cur_user,
prog_name);
if (cur_user)
free(cur_user);
return EXIT_OK;
}