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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 "cfg.h"
#include "pid.h"
#include "db.h"
#include "log.h"
#include "sysinfo.h"
#include "zlog.h"
#include "daemon.h"
#include "discoverer.h"
#include "../events.h"
int discoverer_num;
/******************************************************************************
* *
* Function: add_host_event *
* *
* Purpose: generate host UP/DOWN event if required *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void add_host_event(char *ip)
{
DB_RESULT result;
DB_ROW row;
DB_EVENT event;
int now;
int status;
zbx_uint64_t dhostid;
zabbix_log(LOG_LEVEL_WARNING, "In add_host_event(ip:%s)",
ip);
result = DBselect("select status,dhostid from dhosts where ip='%s'",
ip);
row=DBfetch(result);
if(row && DBis_null(row[0])!=SUCCEED)
{
now = time(NULL);
status = atoi(row[0]);
ZBX_STR2UINT64(dhostid, row[1]);
memset(&event,0,sizeof(DB_EVENT));
event.eventid = 0;
event.source = EVENT_SOURCE_DISCOVERY;
event.object = EVENT_OBJECT_DHOST;
event.objectid = dhostid;
event.clock = now;
event.value = status;
event.acknowledged = 0;
process_event(&event);
}
DBfree_result(result);
zabbix_log(LOG_LEVEL_WARNING, "End add_host_event()");
}
/******************************************************************************
* *
* Function: add_service_event *
* *
* Purpose: generate service UP/DOWN event if required *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void add_service_event(DB_DSERVICE *service)
{
DB_EVENT event;
int now;
zabbix_log(LOG_LEVEL_WARNING, "In add_service_event()");
now = time(NULL);
memset(&event,0,sizeof(DB_EVENT));
event.eventid = 0;
event.source = EVENT_SOURCE_DISCOVERY;
event.object = EVENT_OBJECT_DSERVICE;
event.objectid = service->dserviceid;
event.clock = now;
event.value = service->status;
event.acknowledged = 0;
process_event(&event);
zabbix_log(LOG_LEVEL_WARNING, "End add_service_event()");
}
/******************************************************************************
* *
* Function: update_dservice *
* *
* Purpose: update descovered service details *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void update_dservice(DB_DSERVICE *service)
{
DBexecute("update dservices set dhostid=" ZBX_FS_UI64 ",type=%d,port=%d,status=%d,lastup=%d,lastdown=%d where dserviceid=" ZBX_FS_UI64,
service->dhostid,
service->type,
service->port,
service->status,
service->lastup,
service->lastdown,
service->dserviceid);
}
/******************************************************************************
* *
* Function: update_host *
* *
* Purpose: update descovered host details *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void update_dhost(DB_DHOST *host)
{
DBexecute("update dhosts set druleid=" ZBX_FS_UI64 ",ip='%s',status=%d,lastup=%d,lastdown=%d where dhostid=" ZBX_FS_UI64,
host->druleid,
host->ip,
host->status,
host->lastup,
host->lastdown,
host->dhostid);
}
/******************************************************************************
* *
* Function: register_service *
* *
* Purpose: register service if one does not exist *
* *
* Parameters: host ip address *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void register_service(DB_DSERVICE *service,DB_DRULE *rule,DB_DCHECK *check,zbx_uint64_t dhostid,char *ip,int port)
{
DB_RESULT result;
DB_ROW row;
zbx_uint64_t dserviceid = 0;
zabbix_log(LOG_LEVEL_DEBUG, "In register_service(ip:%s,port:%d)",
ip,
port);
result = DBselect("select dserviceid,dhostid,type,port,status,lastup,lastdown from dservices where dhostid=" ZBX_FS_UI64 " and type=%d and port=%d",
dhostid,
check->type,
port);
row=DBfetch(result);
if(!row || DBis_null(row[0])==SUCCEED)
{
/* Add host only if service is up */
if(check->status == DOBJECT_STATUS_UP)
{
zabbix_log(LOG_LEVEL_DEBUG, "New service discovered on port %d", port);
dserviceid = DBget_maxid("dservices","dserviceid");
DBexecute("insert into dservices (dhostid,dserviceid,type,port,status) values (" ZBX_FS_UI64 "," ZBX_FS_UI64 ",%d,%d,%d)",
dhostid,
dserviceid,
check->type,
port,
DOBJECT_STATUS_UP);
service->dserviceid = dserviceid;
service->dhostid = dhostid;
service->type = check->type;
service->port = port;
service->status = DOBJECT_STATUS_UP;
service->lastup = 0;
service->lastdown = 0;
}
}
else
{
zabbix_log(LOG_LEVEL_DEBUG, "Service is already in database");
ZBX_STR2UINT64(service->dserviceid, row[0]);
ZBX_STR2UINT64(service->dhostid, row[1]);
service->type = atoi(row[2]);
service->port = atoi(row[3]);
service->status = atoi(row[4]);
service->lastup = atoi(row[5]);
service->lastdown = atoi(row[6]);
}
DBfree_result(result);
zabbix_log(LOG_LEVEL_DEBUG, "End register_service()");
}
/******************************************************************************
* *
* Function: register_host *
* *
* Purpose: register host if one does not exist *
* *
* Parameters: host ip address *
* *
* Return value: dhostid or 0 if we didn't add host *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void register_host(DB_DHOST *host,DB_DCHECK *check, zbx_uint64_t druleid, char *ip)
{
DB_RESULT result;
DB_ROW row;
zabbix_log(LOG_LEVEL_DEBUG, "In register_host(ip:%s)",
ip);
host->dhostid=0;
result = DBselect("select dhostid,druleid,ip,status,lastup,lastdown from dhosts where ip='%s' and " ZBX_COND_NODEID,
ip,
LOCAL_NODE("dhostid"));
row=DBfetch(result);
if(!row || DBis_null(row[0])==SUCCEED)
{
/* Add host only if service is up */
if(check->status == DOBJECT_STATUS_UP)
{
zabbix_log(LOG_LEVEL_DEBUG, "New host discovered at %s",
ip);
host->dhostid = DBget_maxid("dhosts","dhostid");
DBexecute("insert into dhosts (dhostid,druleid,ip) values (" ZBX_FS_UI64 "," ZBX_FS_UI64 ",'%s')",
host->dhostid,
druleid,
ip);
host->druleid = druleid;
strscpy(host->ip,ip);
host->status = 0;
host->lastup = 0;
host->lastdown = 0;
}
}
else
{
zabbix_log(LOG_LEVEL_DEBUG, "Host is already in database");
ZBX_STR2UINT64(host->dhostid,row[0]);
ZBX_STR2UINT64(host->druleid,row[1]);
strscpy(host->ip, row[2]);
host->status = atoi(row[3]);
host->lastup = atoi(row[4]);
host->lastdown = atoi(row[5]);
}
DBfree_result(result);
zabbix_log(LOG_LEVEL_DEBUG, "End register_host()");
}
/******************************************************************************
* *
* Function: update_service *
* *
* Purpose: process new service status *
* *
* Parameters: service - service info *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void update_service(DB_DRULE *rule, DB_DCHECK *check, char *ip, int port)
{
int now;
DB_DHOST host;
DB_DSERVICE service;
zabbix_log(LOG_LEVEL_DEBUG, "In update_check(ip:%s, port:%d, status:%s)",
ip,
port,
(check->status==DOBJECT_STATUS_UP?"up":"down"));
service.dserviceid=0;
/* Register host if is not registered yet */
register_host(&host,check,rule->druleid,ip);
if(host.dhostid>0)
{
/* Register service if is not registered yet */
/* dserviceid = register_service(rule,check,host.dhostid,ip,port);*/
register_service(&service,rule,check,host.dhostid,ip,port);
}
if(service.dserviceid == 0)
{
/* Service wasn't registered because we do not add down service */
return;
}
now = time(NULL);
if(check->status == DOBJECT_STATUS_UP)
{
/* Update host status */
if((host.status == DOBJECT_STATUS_DOWN)||(host.lastup==0 && host.lastdown==0))
{
host.status=DOBJECT_STATUS_UP;
host.lastdown=0;
host.lastup=now;
update_dhost(&host);
}
/* Update service status */
if((service.status == DOBJECT_STATUS_DOWN)||(service.lastup==0 && service.lastdown==0))
{
service.status=DOBJECT_STATUS_UP;
service.lastdown=0;
service.lastup=now;
update_dservice(&service);
}
}
/* DOBJECT_STATUS_DOWN */
else
{
if((host.status == DOBJECT_STATUS_UP)||(host.lastup==0 && host.lastdown==0))
{
host.status=DOBJECT_STATUS_DOWN;
host.lastup=now;
host.lastdown=0;
update_dhost(&host);
}
/* Update service status */
if((service.status == DOBJECT_STATUS_UP)||(service.lastup==0 && service.lastdown==0))
{
service.status=DOBJECT_STATUS_DOWN;
service.lastup=now;
service.lastdown=0;
update_dservice(&service);
}
}
add_service_event(&service);
}
/******************************************************************************
* *
* Function: discover_service *
* *
* Purpose: check if service is avaiable and update database *
* *
* Parameters: service typ,e ip address, port number *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static int discover_service(zbx_dservice_type_t type, char *ip, int port)
{
int ret = SUCCEED;
char key[MAX_STRING_LEN];
AGENT_RESULT value;
struct sigaction phan;
zabbix_log(LOG_LEVEL_DEBUG, "In discover_service(ip:%s, port:%d, type:%d)",
ip,
port,
type);
init_result(&value);
switch(type) {
case SVC_SSH:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[ssh,%s,%d]",
ip,
port);
break;
case SVC_LDAP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[ldap,%s,%d]",
ip,
port);
break;
case SVC_SMTP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[smtp,%s,%d]",
ip,
port);
break;
case SVC_FTP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[ftp,%s,%d]",
ip,
port);
break;
case SVC_HTTP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[http,%s,%d]",
ip,
port);
break;
case SVC_POP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[pop,%s,%d]",
ip,
port);
break;
case SVC_NNTP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[nntp,%s,%d]",
ip,
port);
break;
case SVC_IMAP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[imap,%s,%d]",
ip,
port);
break;
case SVC_TCP:
zbx_snprintf(key,sizeof(key)-1,"net.tcp.service[tcp,%s,%d]",
ip,
port);
break;
default:
ret = FAIL;
break;
}
if(ret == SUCCEED)
{
phan.sa_handler = &child_signal_handler;
sigemptyset(&phan.sa_mask);
phan.sa_flags = 0;
sigaction(SIGALRM, &phan, NULL);
alarm(10);
if(process(key, 0, &value) == SUCCEED)
{
if(GET_UI64_RESULT(&value))
{
if(value.ui64 == 0) ret = FAIL;
}
else ret = FAIL;
}
else ret = FAIL;
alarm(0);
}
zabbix_log(LOG_LEVEL_DEBUG, "End discover_service()");
return ret;
}
/******************************************************************************
* *
* Function: process_check *
* *
* Purpose: check if service is avaiable and update database *
* *
* Parameters: service - service info *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void process_check(DB_DRULE *rule, DB_DCHECK *check, char *ip)
{
int port;
char *s,*c;
char tmp[MAX_STRING_LEN];
int first,last;
zabbix_log(LOG_LEVEL_DEBUG, "In process_check(ip:%s, ports:%s, type:%d)",
ip,
check->ports,
check->type);
zbx_snprintf(tmp,sizeof(tmp)-1,"%s",
check->ports);
s=(char *)strtok(tmp,",");
while(s!=NULL)
{
c=strchr(s,'-');
if(c == NULL)
{
first=atoi(s);
last=first;
}
else
{
c[0] = 0;
first=atoi(s);
last=atoi(c+1);
c[0] = '-';
}
for(port=first;port<=last;port++)
{
check->status = discover_service(check->type,ip,port);
update_service(rule, check, ip, port);
}
s=(char *)strtok(NULL,"\n");
}
zabbix_log(LOG_LEVEL_DEBUG, "End process_check()");
}
/******************************************************************************
* *
* Function: process_rule *
* *
* Purpose: process single discovery rule *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static void process_rule(DB_DRULE *rule)
{
DB_RESULT result;
DB_ROW row;
DB_DCHECK check;
char ip[MAX_STRING_LEN];
int first,last;
char *c;
int i;
zabbix_log( LOG_LEVEL_DEBUG, "In process_rule(name:%s)",
rule->name);
first=atoi(strrchr(rule->ipfirst,'.')+1);
last=atoi(strrchr(rule->iplast,'.')+1);
c = strrchr(rule->ipfirst,'.');
for(i=first;i<=last;i++)
{
c[0] = 0;
zbx_snprintf(ip,MAX_STRING_LEN-1,"%s.%d",
rule->ipfirst,
i);
result = DBselect("select dcheckid,druleid,type,ports from dchecks where druleid=" ZBX_FS_UI64,
rule->druleid);
while((row=DBfetch(result)))
{
ZBX_STR2UINT64(check.dcheckid,row[0]);
ZBX_STR2UINT64(check.druleid,row[1]);
check.type = atoi(row[2]);
check.ports = row[3];
process_check(rule, &check, ip);
}
DBfree_result(result);
add_host_event(ip);
c[0] = '.';
}
zabbix_log( LOG_LEVEL_DEBUG, "End process_rule()");
}
/******************************************************************************
* *
* Function: main_discoverer_loop *
* *
* Purpose: periodically try to find new hosts and services *
* *
* Parameters: *
* *
* Return value: *
* *
* Author: Alexei Vladishev *
* *
* Comments: executes once per 30 seconds (hardcoded) *
* *
******************************************************************************/
void main_discoverer_loop(int num)
{
int now;
DB_RESULT result;
DB_ROW row;
DB_DRULE rule;
zabbix_log( LOG_LEVEL_DEBUG, "In main_discoverer_loop(num:%d)",
num);
discoverer_num = num;
DBconnect(ZBX_DB_CONNECT_NORMAL);
for(;;)
{
now=time(NULL);
result = DBselect("select druleid,ipfirst,iplast,delay,nextcheck,name,status from drules where status=%d and nextcheck<=%d and " ZBX_SQL_MOD(druleid,%d) "=%d and" ZBX_COND_NODEID,
DRULE_STATUS_MONITORED,
now,
CONFIG_DISCOVERER_FORKS,
discoverer_num-1,
LOCAL_NODE("druleid"));
while((row=DBfetch(result)))
{
ZBX_STR2UINT64(rule.druleid,row[0]);
rule.ipfirst = row[1];
rule.iplast = row[2];
rule.delay = atoi(row[3]);
rule.nextcheck = atoi(row[4]);
rule.name = row[5];
rule.status = atoi(row[6]);
process_rule(&rule);
}
DBfree_result(result);
zbx_setproctitle("sleeping for 30 sec");
sleep(30);
}
DBclose();
}
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