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/*
** ZABBIX
** Copyright (C) 2000-2005 SIA Zabbix
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**/
#include "common.h"
#include "daemon.h"
#include "mutexs.h"
#include "pid.h"
#include "cfg.h"
#include "log.h"
char *APP_PID_FILE = NULL;
static int parent = 0;
#define uninit() { if(parent == 1) zbx_on_exit(); }
void child_signal_handler(int sig)
{
switch(sig)
{
case SIGALRM:
signal(SIGALRM , child_signal_handler);
zabbix_log( LOG_LEVEL_WARNING, "Timeout while answering request");
break;
case SIGQUIT:
case SIGINT:
case SIGTERM:
zabbix_log( LOG_LEVEL_DEBUG, "Got signal. Exiting ...");
uninit();
exit( FAIL );
break;
case SIGPIPE:
zabbix_log( LOG_LEVEL_WARNING, "Got SIGPIPE. Where it came from???");
break;
default:
zabbix_log( LOG_LEVEL_WARNING, "Got signal [%d]. Ignoring ...", sig);
}
}
static void parent_signal_handler(int sig)
{
switch(sig)
{
case SIGCHLD:
zabbix_log( LOG_LEVEL_WARNING, "One child process died. Exiting ...");
uninit();
exit( FAIL );
break;
default:
child_signal_handler(sig);
}
}
/******************************************************************************
* *
* Function: daemon_start *
* *
* Purpose: init process as daemon *
* *
* Parameters: allow_root - allow root permision for application *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: it doesn't allow running under 'root' if allow_root is zerro *
* *
******************************************************************************/
int daemon_start(int allow_root)
{
pid_t pid;
struct passwd *pwd;
struct sigaction phan;
char user[7] = "zabbix";
/* running as root ?*/
if((0 == allow_root) && (0 == getuid() || 0 == getgid()))
{
pwd = getpwnam(user);
if (NULL == pwd)
{
zbx_error("User %s does not exist.",
user);
zbx_error("Cannot run as root !");
exit(FAIL);
}
if(setgid(pwd->pw_gid) ==-1)
{
zbx_error("Cannot setgid to %s [%s].",
user,
strerror(errno));
exit(FAIL);
}
#ifdef HAVE_FUNCTION_SETEUID
if(initgroups(user, pwd->pw_gid) == -1)
{
zbx_error("Cannot initgroups to %s [%s].",
user,
strerror(errno));
exit(FAIL);
}
#endif /* HAVE_FUNCTION_INITGROUPS */
if(setuid(pwd->pw_uid) == -1)
{
zbx_error("Cannot setuid to %s [%s].",
user,
strerror(errno));
exit(FAIL);
}
#ifdef HAVE_FUNCTION_SETEUID
if( (setegid(pwd->pw_gid) ==-1) || (seteuid(pwd->pw_uid) == -1) )
{
zbx_error("Cannot setegid or seteuid to zabbix [%s].", strerror(errno));
exit(FAIL);
}
#endif /* HAVE_FUNCTION_SETEUID */
}
if( (pid = zbx_fork()) != 0 )
{
exit( 0 );
}
setsid();
signal( SIGHUP, SIG_IGN );
if( (pid = zbx_fork()) !=0 )
{
exit( 0 );
}
/* This is to eliminate warning: ignoring return value of chdir */
if(-1 == chdir("/"))
{
assert(0);
}
umask(0002);
redirect_std(CONFIG_LOG_FILE);
#ifdef HAVE_SYS_RESOURCE_SETPRIORITY
if(setpriority(PRIO_PROCESS,0,5)!=0)
{
zbx_error("Unable to set process priority to 5. Leaving default.");
}
#endif /* HAVE_SYS_RESOURCE_SETPRIORITY */
/*------------------------------------------------*/
if( FAIL == create_pid_file(APP_PID_FILE))
{
exit(FAIL);
}
phan.sa_handler = child_signal_handler;
sigemptyset(&phan.sa_mask);
phan.sa_flags = 0;
sigaction(SIGINT, &phan, NULL);
sigaction(SIGQUIT, &phan, NULL);
sigaction(SIGTERM, &phan, NULL);
sigaction(SIGPIPE, &phan, NULL);
zbx_setproctitle("main process");
return MAIN_ZABBIX_ENTRY();
}
void daemon_stop(void)
{
drop_pid_file(APP_PID_FILE);
}
void init_main_process(void)
{
struct sigaction phan;
parent = 1; /* signalize signal_handler what this process isi a PARENT process */
phan.sa_handler = parent_signal_handler;
sigemptyset(&phan.sa_mask);
phan.sa_flags = 0;
/* For parent only. To avoid problems with EXECUTE_INT */
sigaction(SIGCHLD, &phan, NULL);
}
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