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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 <sys/stat.h>
#include <string.h>
/* Required for getpwuid */
#include <pwd.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
/* getopt() */
#include <unistd.h>
#include "cfg.h"
#include "pid.h"
#include "db.h"
#include "log.h"
#include "zlog.h"
#include "common.h"
#include "../functions.h"
#include "../expression.h"
#include "poller.h"
#include "checks_agent.h"
#include "checks_internal.h"
#include "checks_simple.h"
#include "checks_snmp.h"
AGENT_RESULT result;
int get_value(DB_ITEM *item, AGENT_RESULT *result)
{
int res=FAIL;
struct sigaction phan;
phan.sa_handler = &signal_handler;
sigemptyset(&phan.sa_mask);
phan.sa_flags = 0;
sigaction(SIGALRM, &phan, NULL);
alarm(CONFIG_TIMEOUT);
if(item->type == ITEM_TYPE_ZABBIX)
{
res=get_value_agent(item, result);
}
else if( (item->type == ITEM_TYPE_SNMPv1) || (item->type == ITEM_TYPE_SNMPv2c) || (item->type == ITEM_TYPE_SNMPv3))
{
#ifdef HAVE_SNMP
res=get_value_snmp(item, result);
#else
zabbix_log(LOG_LEVEL_WARNING, "Support of SNMP parameters was not compiled in");
zabbix_syslog("Support of SNMP parameters was not compiled in. Cannot process [%s:%s]", item->host, item->key);
res=NOTSUPPORTED;
#endif
}
else if(item->type == ITEM_TYPE_SIMPLE)
{
res=get_value_simple(item, result);
}
else if(item->type == ITEM_TYPE_INTERNAL)
{
res=get_value_internal(item, result);
}
else
{
zabbix_log(LOG_LEVEL_WARNING, "Not supported item type:%d",item->type);
zabbix_syslog("Not supported item type:%d",item->type);
res=NOTSUPPORTED;
}
alarm(0);
return res;
}
static int get_minnextcheck(int now)
{
char sql[MAX_STRING_LEN];
DB_RESULT *result;
int res;
/* Host status 0 == MONITORED
1 == NOT MONITORED
2 == UNREACHABLE */
if(CONFIG_REFRESH_UNSUPPORTED != 0)
{
/* snprintf(sql,sizeof(sql)-1,"select count(*),min(nextcheck) from items i,hosts h where ((h.status=%d and h.available!=%d) or (h.status=%d and h.available=%d and h.disable_until<%d)) and h.hostid=i.hostid and i.status in (%d,%d) and i.type not in (%d,%d) and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s')", HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE,HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE, now, ITEM_STATUS_ACTIVE, ITEM_STATUS_NOTSUPPORTED, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);*/
snprintf(sql,sizeof(sql)-1,"select count(*),min(nextcheck) from items i,hosts h where h.status=%d and h.disable_until<%d and h.hostid=i.hostid and i.status in (%d,%d) and i.type not in (%d,%d) and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s')", HOST_STATUS_MONITORED, now, ITEM_STATUS_ACTIVE, ITEM_STATUS_NOTSUPPORTED, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);
}
else
{
/* snprintf(sql,sizeof(sql)-1,"select count(*),min(nextcheck) from items i,hosts h where ((h.status=%d and h.available!=%d) or (h.status=%d and h.available=%d and h.disable_until<%d)) and h.hostid=i.hostid and i.status in (%d) and i.type not in (%d,%d) and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s')", HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE,HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE, now, ITEM_STATUS_ACTIVE, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);*/
snprintf(sql,sizeof(sql)-1,"select count(*),min(nextcheck) from items i,hosts h where h.status=%d and h.disable_until<%d and h.hostid=i.hostid and i.status in (%d,%d) and i.type not in (%d) and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s')", HOST_STATUS_MONITORED, now, ITEM_STATUS_ACTIVE, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);
}
result = DBselect(sql);
if( DBnum_rows(result) == 0)
{
zabbix_log(LOG_LEVEL_DEBUG, "No items to update for minnextcheck.");
res = FAIL;
}
else
{
if( atoi(DBget_field(result,0,0)) == 0)
{
res = FAIL;
}
else
{
res = atoi(DBget_field(result,0,1));
}
}
DBfree_result(result);
return res;
}
/* Update special host's item - "status" */
static void update_key_status(int hostid,int host_status)
{
char sql[MAX_STRING_LEN];
/* char value_str[MAX_STRING_LEN];*/
AGENT_RESULT agent;
DB_ITEM item;
DB_RESULT *result;
zabbix_log(LOG_LEVEL_DEBUG, "In update_key_status()");
snprintf(sql,sizeof(sql)-1,"select %s where h.hostid=i.hostid and h.hostid=%d and i.key_='%s'", ZBX_SQL_ITEM_SELECT, hostid,SERVER_STATUS_KEY);
result = DBselect(sql);
if( DBnum_rows(result) == 0)
{
zabbix_log( LOG_LEVEL_DEBUG, "No items to update.");
}
else
{
DBget_item_from_db(&item,result,0);
/* Do not process new value for status, if previous status is the same */
if(cmp_double(item.lastvalue, (double)host_status) == 1)
{
init_result(&agent);
SET_UI64_RESULT(&agent, host_status);
process_new_value(&item,&agent);
free_result(&agent);
update_triggers(item.itemid);
}
}
DBfree_result(result);
}
/******************************************************************************
* *
* Function: get_values *
* *
* Purpose: retrieve values of metrics from monitored hosts *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: always SUCCEED *
* *
******************************************************************************/
int get_values(void)
{
char sql[MAX_STRING_LEN];
DB_RESULT *result;
int i;
int now;
int res;
DB_ITEM item;
AGENT_RESULT agent;
int stop;
now = time(NULL);
if(CONFIG_REFRESH_UNSUPPORTED != 0)
{
/* snprintf(sql,sizeof(sql)-1,"select %s where i.nextcheck<=%d and i.status in (%d,%d) and i.type not in (%d,%d) and ((h.status=%d and h.available!=%d) or (h.status=%d and h.available=%d and h.disable_until<=%d)) and h.hostid=i.hostid and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s') order by i.nextcheck", ZBX_SQL_ITEM_SELECT, now, ITEM_STATUS_ACTIVE, ITEM_STATUS_NOTSUPPORTED, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE, HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE, now, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);*/
snprintf(sql,sizeof(sql)-1,"select %s where i.nextcheck<=%d and i.status in (%d,%d) and i.type not in (%d,%d) and h.status=%d and h.disable_until<=%d and h.hostid=i.hostid and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s') order by i.nextcheck", ZBX_SQL_ITEM_SELECT, now, ITEM_STATUS_ACTIVE, ITEM_STATUS_NOTSUPPORTED, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, HOST_STATUS_MONITORED, now, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);
}
else
{
/* snprintf(sql,sizeof(sql)-1,"select %s where i.nextcheck<=%d and i.status in (%d) and i.type not in (%d,%d) and ((h.status=%d and h.available!=%d) or (h.status=%d and h.available=%d and h.disable_until<=%d)) and h.hostid=i.hostid and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s') order by i.nextcheck", ZBX_SQL_ITEM_SELECT, now, ITEM_STATUS_ACTIVE, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE, HOST_STATUS_MONITORED, HOST_AVAILABLE_FALSE, now, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);*/
snprintf(sql,sizeof(sql)-1,"select %s where i.nextcheck<=%d and i.status in (%d) and i.type not in (%d,%d) and h.status=%d and h.disable_until<=%d and h.hostid=i.hostid and i.itemid%%%d=%d and i.key_ not in ('%s','%s','%s','%s') order by i.nextcheck", ZBX_SQL_ITEM_SELECT, now, ITEM_STATUS_ACTIVE, ITEM_TYPE_TRAPPER, ITEM_TYPE_ZABBIX_ACTIVE, HOST_STATUS_MONITORED, now, CONFIG_SUCKERD_FORKS-5,server_num-5,SERVER_STATUS_KEY, SERVER_ICMPPING_KEY, SERVER_ICMPPINGSEC_KEY,SERVER_ZABBIXLOG_KEY);
}
result = DBselect(sql);
for(stop=i=0;i<DBnum_rows(result)&&stop==0;i++)
{
DBget_item_from_db(&item,result, i);
init_result(&agent);
zabbix_log( LOG_LEVEL_DEBUG, "GOT VALUE TYPE [0x%X]", agent.type);
res = get_value(&item, &agent);
if(res == SUCCEED )
{
process_new_value(&item,&agent);
if(item.host_errors_from!=0)
{
zabbix_log( LOG_LEVEL_WARNING, "No network errors for [%s]", item.host);
}
/* if(HOST_STATUS_UNREACHABLE == item.host_status)*/
if(HOST_AVAILABLE_TRUE != item.host_available)
{
zabbix_log( LOG_LEVEL_WARNING, "Enabling host [%s]", item.host );
zabbix_syslog("Enabling host [%s]", item.host );
DBupdate_host_availability(item.hostid,HOST_AVAILABLE_TRUE,now,agent.msg);
update_key_status(item.hostid, HOST_STATUS_MONITORED); /* 0 */
item.host_available=HOST_AVAILABLE_TRUE;
stop=1;
}
update_triggers(item.itemid);
}
else if(res == NOTSUPPORTED)
{
if(item.status == ITEM_STATUS_NOTSUPPORTED)
{
snprintf(sql,sizeof(sql)-1,"update items set nextcheck=%d, lastclock=%d where itemid=%d",calculate_item_nextcheck(CONFIG_REFRESH_UNSUPPORTED,now), now, item.itemid);
DBexecute(sql);
}
else
{
zabbix_log( LOG_LEVEL_WARNING, "Parameter [%s] is not supported by agent on host [%s] Old status [%d]", item.key, item.host, item.status);
zabbix_syslog("Parameter [%s] is not supported by agent on host [%s]", item.key, item.host );
DBupdate_item_status_to_notsupported(item.itemid, agent.str);
/* if(HOST_STATUS_UNREACHABLE == item.host_status)*/
if(HOST_AVAILABLE_TRUE != item.host_available)
{
zabbix_log( LOG_LEVEL_WARNING, "Enabling host [%s]", item.host );
zabbix_syslog("Enabling host [%s]", item.host );
DBupdate_host_availability(item.hostid,HOST_AVAILABLE_TRUE,now,agent.msg);
update_key_status(item.hostid, HOST_STATUS_MONITORED); /* 0 */
item.host_available=HOST_AVAILABLE_TRUE;
stop=1;
}
}
}
else if(res == NETWORK_ERROR)
{
if(item.host_errors_from==0)
{
zabbix_log( LOG_LEVEL_WARNING, "Started network errors for [%s]", item.host);
item.host_errors_from=now;
snprintf(sql,sizeof(sql)-1,"update hosts set errors_from=%d,disable_until=%d where hostid=%d", now, now+(int)(CONFIG_UNAVAILABLE_PERIOD/CHECKS_PER_UNAVAILABLE_PERIOD), item.hostid);
zabbix_log( LOG_LEVEL_DEBUG, "SQL [%s]", sql);
DBexecute(sql);
}
zabbix_log( LOG_LEVEL_WARNING, "errors_from [%d]+[%d]<[%d]", item.host_errors_from,CONFIG_UNAVAILABLE_PERIOD,now);
if(item.host_errors_from+CONFIG_UNAVAILABLE_PERIOD<now)
{
zabbix_log( LOG_LEVEL_WARNING, "Host [%s] will be checked after [%d] seconds", item.host, 60);
zabbix_syslog("Host [%s] will be checked after [%d] seconds", item.host, 60);
DBupdate_host_availability(item.hostid,HOST_AVAILABLE_FALSE,now,agent.msg);
update_key_status(item.hostid,HOST_AVAILABLE_FALSE); /* 2 */
item.host_available=HOST_AVAILABLE_FALSE;
}
/* Still unavailable, but won't change status to UNAVAILABLE yet */
else
{
zabbix_log( LOG_LEVEL_WARNING, "Host [%s]: another network error, Wait for %d seconds", item.host, (int)(CONFIG_UNAVAILABLE_PERIOD/CHECKS_PER_UNAVAILABLE_PERIOD));
snprintf(sql,sizeof(sql)-1,"update hosts set disable_until=%d where hostid=%d", now+(int)(CONFIG_UNAVAILABLE_PERIOD/CHECKS_PER_UNAVAILABLE_PERIOD), item.hostid);
zabbix_log( LOG_LEVEL_DEBUG, "SQL [%s]", sql);
DBexecute(sql);
}
stop=1;
}
/* Possibly, other logic required? */
else if(res == AGENT_ERROR)
{
zabbix_log( LOG_LEVEL_WARNING, "Getting value of [%s] from host [%s] failed (ZBX_ERROR)", item.key, item.host );
zabbix_syslog("Getting value of [%s] from host [%s] failed (ZBX_ERROR)", item.key, item.host );
zabbix_log( LOG_LEVEL_WARNING, "The value is not stored in database.");
stop=1;
}
else
{
zabbix_log( LOG_LEVEL_WARNING, "Getting value of [%s] from host [%s] failed", item.key, item.host );
zabbix_syslog("Getting value of [%s] from host [%s] failed", item.key, item.host );
zabbix_log( LOG_LEVEL_WARNING, "The value is not stored in database.");
}
free_result(&agent);
}
DBfree_result(result);
return SUCCEED;
}
void main_poller_loop()
{
int now;
int nextcheck,sleeptime;
DBconnect();
for(;;)
{
#ifdef HAVE_FUNCTION_SETPROCTITLE
setproctitle("poller [getting values]");
#endif
now=time(NULL);
get_values();
zabbix_log( LOG_LEVEL_DEBUG, "Spent %d seconds while updating values", (int)time(NULL)-now );
nextcheck=get_minnextcheck(now);
zabbix_log( LOG_LEVEL_DEBUG, "Nextcheck:%d Time:%d", nextcheck, (int)time(NULL) );
if( FAIL == nextcheck)
{
sleeptime=POLLER_DELAY;
}
else
{
sleeptime=nextcheck-time(NULL);
if(sleeptime<0)
{
sleeptime=0;
}
}
if(sleeptime>0)
{
if(sleeptime > POLLER_DELAY)
{
sleeptime = POLLER_DELAY;
}
zabbix_log( LOG_LEVEL_DEBUG, "Sleeping for %d seconds",
sleeptime );
#ifdef HAVE_FUNCTION_SETPROCTITLE
setproctitle("poller [sleeping for %d seconds]",
sleeptime);
#endif
sleep( sleeptime );
}
else
{
zabbix_log( LOG_LEVEL_DEBUG, "No sleeping" );
}
}
}
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