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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 "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <string.h>
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
/* Required for getpwuid */
#include <pwd.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include "common.h"
#include "cfg.h"
#include "db.h"
#include "../functions.h"
#include "log.h"
#include "zlog.h"
#include "email.h"
#include "alerter.h"
/******************************************************************************
* *
* Function: signal_handler *
* *
* Purpose: dummy signal handler *
* *
* Parameters: sign - signal id *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void signal_handler2( int sig )
{
zabbix_log( LOG_LEVEL_DEBUG, "Got signal [%d]", sig);
}
/******************************************************************************
* *
* Function: execute_action *
* *
* Purpose: executa an action depending on mediatype *
* *
* Parameters: alert - alert details *
* mediatype - media details *
* *
* Return value: SUCCESS - action executed sucesfully *
* FAIL - otherwise, error will contain error message *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static int execute_action(DB_ALERT *alert,DB_MEDIATYPE *mediatype, char *error, int max_error_len)
{
int res=FAIL;
struct sigaction phan;
int pid;
char full_path[MAX_STRING_LEN];
zabbix_log( LOG_LEVEL_DEBUG, "In execute_action()");
if(mediatype->type==ALERT_TYPE_EMAIL)
{
res = send_email(mediatype->smtp_server,mediatype->smtp_helo,mediatype->smtp_email,alert->sendto,alert->subject,
alert->message, error, max_error_len);
}
else if(mediatype->type==ALERT_TYPE_EXEC)
{
/* if(-1 == execl(CONFIG_ALERT_SCRIPTS_PATH,mediatype->exec_path,alert->sendto,alert->subject,alert->message))*/
zabbix_log( LOG_LEVEL_DEBUG, "Before execl([%s],[%s])",CONFIG_ALERT_SCRIPTS_PATH,mediatype->exec_path);
phan.sa_handler = &signal_handler2;
phan.sa_handler = SIG_IGN;
/* signal( SIGCHLD, SIG_IGN );*/
sigemptyset(&phan.sa_mask);
phan.sa_flags = 0;
sigaction(SIGCHLD, &phan, NULL);
/* if(-1 == execl("/home/zabbix/bin/lmt.sh","lmt.sh",alert->sendto,alert->subject,alert->message,(char *)0))*/
pid=fork();
if(0 != pid)
{
waitpid(pid,NULL,0);
}
else
{
strscpy(full_path,CONFIG_ALERT_SCRIPTS_PATH);
strncat(full_path,"/",MAX_STRING_LEN);
strncat(full_path,mediatype->exec_path,MAX_STRING_LEN);
zabbix_log( LOG_LEVEL_DEBUG, "Before executing [%s] [%m]", full_path);
if(-1 == execl(full_path,mediatype->exec_path,alert->sendto,alert->subject,alert->message,(char *)0))
{
zabbix_log( LOG_LEVEL_ERR, "Error executing [%s] [%s]", full_path, strerror(errno));
zabbix_syslog("Error executing [%s] [%s]", full_path, strerror(errno));
snprintf(error,max_error_len-1,"Error executing [%s] [%s]", full_path, strerror(errno));
res = FAIL;
}
else
{
res = SUCCEED;
}
/* In normal case the program will never reach this point */
zabbix_log( LOG_LEVEL_DEBUG, "After execl()");
exit(0);
}
res = SUCCEED;
}
else
{
zabbix_log( LOG_LEVEL_ERR, "Unsupported media type [%d] for alert ID [%d]", mediatype->type,alert->alertid);
zabbix_syslog("Unsupported media type [%d] for alert ID [%d]", mediatype->type,alert->alertid);
snprintf(error,max_error_len-1,"Unsupported media type [%d]", mediatype->type);
res=FAIL;
}
zabbix_log( LOG_LEVEL_DEBUG, "End of execute_action()");
return res;
}
/******************************************************************************
* *
* Function: main_alerter_loop *
* *
* Purpose: periodically check table alerts and send notifications if needed *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: never returns *
* *
******************************************************************************/
int main_alerter_loop()
{
char sql[MAX_STRING_LEN];
char error[MAX_STRING_LEN];
char error_esc[MAX_STRING_LEN];
int i,res, now;
struct sigaction phan;
DB_RESULT *result;
DB_ALERT alert;
DB_MEDIATYPE mediatype;
for(;;)
{
#ifdef HAVE_FUNCTION_SETPROCTITLE
setproctitle("connecting to the database");
#endif
DBconnect();
now = time(NULL);
/* snprintf(sql,sizeof(sql)-1,"select a.alertid,a.mediatypeid,a.sendto,a.subject,a.message,a.status,a.retries,mt.mediatypeid,mt.type,mt.description,mt.smtp_server,mt.smtp_helo,mt.smtp_email,mt.exec_path from alerts a,media_type mt where a.status=0 and a.retries<3 and a.mediatypeid=mt.mediatypeid order by a.clock"); */
snprintf(sql,sizeof(sql)-1,"select a.alertid,a.mediatypeid,a.sendto,a.subject,a.message,a.status,a.retries,mt.mediatypeid,mt.type,mt.description,mt.smtp_server,mt.smtp_helo,mt.smtp_email,mt.exec_path,a.delay from alerts a,media_type mt where a.status=%d and a.retries<3 and (a.repeats<a.maxrepeats or a.maxrepeats=0) and a.nextcheck<=%d and a.mediatypeid=mt.mediatypeid order by a.clock", ALERT_STATUS_NOT_SENT, now);
zabbix_log( LOG_LEVEL_WARNING, "SQL [%s]", sql);
result = DBselect(sql);
for(i=0;i<DBnum_rows(result);i++)
{
alert.alertid=atoi(DBget_field(result,i,0));
alert.mediatypeid=atoi(DBget_field(result,i,1));
alert.sendto=DBget_field(result,i,2);
alert.subject=DBget_field(result,i,3);
alert.message=DBget_field(result,i,4);
alert.status=atoi(DBget_field(result,i,5));
alert.retries=atoi(DBget_field(result,i,6));
mediatype.mediatypeid=atoi(DBget_field(result,i,7));
mediatype.type=atoi(DBget_field(result,i,8));
mediatype.description=DBget_field(result,i,9);
mediatype.smtp_server=DBget_field(result,i,10);
mediatype.smtp_helo=DBget_field(result,i,11);
mediatype.smtp_email=DBget_field(result,i,12);
mediatype.exec_path=DBget_field(result,i,13);
alert.delay=atoi(DBget_field(result,i,14));
phan.sa_handler = &signal_handler;
sigemptyset(&phan.sa_mask);
phan.sa_flags = 0;
sigaction(SIGALRM, &phan, NULL);
/* Hardcoded value */
alarm(10);
res=execute_action(&alert,&mediatype,error,sizeof(error));
alarm(0);
if(res==SUCCEED)
{
zabbix_log( LOG_LEVEL_DEBUG, "Alert ID [%d] was sent successfully", alert.alertid);
snprintf(sql,sizeof(sql)-1,"update alerts set repeats=repeats+1, nextcheck=%d where alertid=%d", now+alert.delay, alert.alertid);
zabbix_log( LOG_LEVEL_WARNING, "SQL [%s]", sql);
DBexecute(sql);
snprintf(sql,sizeof(sql)-1,"update alerts set status=%d where alertid=%d and repeats>maxrepeats and status=%d and retries<3", ALERT_STATUS_SENT, alert.alertid, ALERT_STATUS_NOT_SENT);
zabbix_log( LOG_LEVEL_WARNING, "SQL [%s]", sql);
DBexecute(sql);
}
else
{
zabbix_log( LOG_LEVEL_DEBUG, "Error sending alert ID [%d]", alert.alertid);
zabbix_syslog("Error sending alert ID [%d]", alert.alertid);
DBescape_string(error,error_esc,MAX_STRING_LEN);
snprintf(sql,sizeof(sql)-1,"update alerts set retries=retries+1,error='%s' where alertid=%d", error_esc, alert.alertid);
zabbix_log( LOG_LEVEL_WARNING, "SQL [%s]", sql);
DBexecute(sql);
}
}
DBfree_result(result);
DBclose();
#ifdef HAVE_FUNCTION_SETPROCTITLE
setproctitle("sender [sleeping for %d seconds]", CONFIG_SENDER_FREQUENCY);
#endif
sleep(CONFIG_SENDER_FREQUENCY);
}
}
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