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/* Copyright (C) 2007-2010 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Gerardo Iglesias Galvan <iglesiasg@gmail.com>
*
* Daemonization process
*/
#include "suricata.h"
#include "suricata-common.h"
#include "runmodes.h"
#include "util-daemon.h"
#include "util-debug.h"
#include "conf.h"
#ifndef OS_WIN32
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
static volatile sig_atomic_t sigflag = 0;
/**
* \brief Signal handler used to take the parent process out of stand-by
*/
static void SignalHandlerSigusr1 (int signo)
{
sigflag = 1;
}
/**
* \brief Tell the parent process the child is ready
*
* \param pid pid of the parent process to signal
*/
static void TellWaitingParent (pid_t pid)
{
kill(pid, SIGUSR1);
}
/**
* \brief Set the parent on stand-by until the child is ready
*
* \param pid pid of the child process to wait
*/
static void WaitForChild (pid_t pid)
{
int status;
SCLogDebug("Daemon: Parent waiting for child to be ready...");
/* Wait until child signals is ready */
while (sigflag == 0) {
if (waitpid(pid, &status, WNOHANG)) {
/* Check if the child is still there, otherwise the parent should exit */
if (WIFEXITED(status) || WIFSIGNALED(status)) {
SCLogError(SC_ERR_DAEMON, "Child died unexpectedly");
exit(EXIT_FAILURE);
}
}
/* sigsuspend(); */
sleep(1);
}
}
/**
* \brief Close stdin, stdout, stderr.Redirect logging info to syslog
*
*/
static void SetupLogging (void)
{
/* Redirect stdin, stdout, stderr to /dev/null */
int fd = open("/dev/null", O_RDWR);
if (fd < 0)
return;
if (dup2(fd, 0) < 0)
return;
if (dup2(fd, 1) < 0)
return;
if (dup2(fd, 2) < 0)
return;
close(fd);
}
/**
* \brief Daemonize the process
*
*/
void Daemonize (void)
{
pid_t pid, sid;
/* Register the signal handler */
signal(SIGUSR1, SignalHandlerSigusr1);
/** \todo We should check if wie allow more than 1 instance
to run simultaneously. Maybe change the behaviour
through conf file */
/* Creates a new process */
pid = fork();
if (pid < 0) {
/* Fork error */
SCLogError(SC_ERR_DAEMON, "Error forking the process");
exit(EXIT_FAILURE);
} else if (pid == 0) {
/* Child continues here */
char *daemondir;
umask(027);
sid = setsid();
if (sid < 0) {
SCLogError(SC_ERR_DAEMON, "Error creating new session");
exit(EXIT_FAILURE);
}
if (ConfGet("daemon-directory", &daemondir) == 1) {
if ((chdir(daemondir)) < 0) {
SCLogError(SC_ERR_DAEMON, "Error changing to working directory");
exit(EXIT_FAILURE);
}
}
#ifndef OS_WIN32
else {
if (chdir("/") < 0) {
SCLogError(SC_ERR_DAEMON, "Error changing to working directory '/'");
}
}
#endif
SetupLogging();
/* Child is ready, tell its parent */
TellWaitingParent(getppid());
/* Daemon is up and running */
SCLogDebug("Daemon is running");
return;
}
/* Parent continues here, waiting for child to be ready */
SCLogDebug("Parent is waiting for child to be ready");
WaitForChild(pid);
/* Parent exits */
SCLogDebug("Child is ready, parent exiting");
exit(EXIT_SUCCESS);
}
#endif /* ifndef OS_WIN32 */
/**
* \brief Check for a valid combination daemon/mode
*
* \param daemon daemon on or off
* \param mode selected mode
*
* \retval 1 valid combination
* \retval 0 invalid combination
*/
int CheckValidDaemonModes (int daemon, int mode)
{
if (daemon) {
switch (mode) {
case RUNMODE_PCAP_FILE:
SCLogError(SC_ERR_INVALID_RUNMODE, "ERROR: pcap offline mode cannot run as daemon");
return 0;
case RUNMODE_UNITTEST:
SCLogError(SC_ERR_INVALID_RUNMODE, "ERROR: unittests cannot run as daemon");
return 0;
default:
SCLogDebug("Allowed mode");
break;
}
}
return 1;
}
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