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/*
** Zabbix
** Copyright (C) 2001-2019 Zabbix SIA
**
** 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
#include "common.h"
#include "comms.h"
#include "log.h"
#include "../../libs/zbxcrypto/tls_tcp_active.h"
#include "checks_agent.h"
#if !(defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL))
extern unsigned char program_type;
#endif
/******************************************************************************
* *
* Function: get_value_agent *
* *
* Purpose: retrieve data from Zabbix agent *
* *
* Parameters: item - item we are interested in *
* *
* Return value: SUCCEED - data successfully retrieved and stored in result *
* and result_str (as string) *
* NETWORK_ERROR - network related error occurred *
* NOTSUPPORTED - item not supported by the agent *
* AGENT_ERROR - uncritical error on agent side occurred *
* FAIL - otherwise *
* *
* Author: Alexei Vladishev *
* *
* Comments: error will contain error message *
* *
******************************************************************************/
int get_value_agent(DC_ITEM *item, AGENT_RESULT *result)
{
const char *__function_name = "get_value_agent";
zbx_socket_t s;
char *tls_arg1, *tls_arg2;
int ret = SUCCEED;
ssize_t received_len;
if (SUCCEED == zabbix_check_log_level(LOG_LEVEL_DEBUG))
{
zabbix_log(LOG_LEVEL_DEBUG, "In %s() host:'%s' addr:'%s' key:'%s' conn:'%s'", __function_name,
item->host.host, item->interface.addr, item->key,
zbx_tcp_connection_type_name(item->host.tls_connect));
}
switch (item->host.tls_connect)
{
case ZBX_TCP_SEC_UNENCRYPTED:
tls_arg1 = NULL;
tls_arg2 = NULL;
break;
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
case ZBX_TCP_SEC_TLS_CERT:
tls_arg1 = item->host.tls_issuer;
tls_arg2 = item->host.tls_subject;
break;
case ZBX_TCP_SEC_TLS_PSK:
tls_arg1 = item->host.tls_psk_identity;
tls_arg2 = item->host.tls_psk;
break;
#else
case ZBX_TCP_SEC_TLS_CERT:
case ZBX_TCP_SEC_TLS_PSK:
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "A TLS connection is configured to be used with agent"
" but support for TLS was not compiled into %s.",
get_program_type_string(program_type)));
ret = CONFIG_ERROR;
goto out;
#endif
default:
THIS_SHOULD_NEVER_HAPPEN;
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid TLS connection parameters."));
ret = CONFIG_ERROR;
goto out;
}
if (SUCCEED == (ret = zbx_tcp_connect(&s, CONFIG_SOURCE_IP, item->interface.addr, item->interface.port, 0,
item->host.tls_connect, tls_arg1, tls_arg2)))
{
zabbix_log(LOG_LEVEL_DEBUG, "Sending [%s]", item->key);
if (SUCCEED != zbx_tcp_send(&s, item->key))
ret = NETWORK_ERROR;
else if (FAIL != (received_len = zbx_tcp_recv_ext(&s, 0)))
ret = SUCCEED;
else if (SUCCEED == zbx_alarm_timed_out())
ret = TIMEOUT_ERROR;
else
ret = NETWORK_ERROR;
}
else
ret = NETWORK_ERROR;
if (SUCCEED == ret)
{
zbx_rtrim(s.buffer, " \r\n");
zbx_ltrim(s.buffer, " ");
zabbix_log(LOG_LEVEL_DEBUG, "get value from agent result: '%s'", s.buffer);
if (0 == strcmp(s.buffer, ZBX_NOTSUPPORTED))
{
/* 'ZBX_NOTSUPPORTED\0<error message>' */
if (sizeof(ZBX_NOTSUPPORTED) < s.read_bytes)
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "%s", s.buffer + sizeof(ZBX_NOTSUPPORTED)));
else
SET_MSG_RESULT(result, zbx_strdup(NULL, "Not supported by Zabbix Agent"));
ret = NOTSUPPORTED;
}
else if (0 == strcmp(s.buffer, ZBX_ERROR))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Zabbix Agent non-critical error"));
ret = AGENT_ERROR;
}
else if (0 == received_len)
{
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Received empty response from Zabbix Agent at [%s]."
" Assuming that agent dropped connection because of access permissions.",
item->interface.addr));
ret = NETWORK_ERROR;
}
else
set_result_type(result, ITEM_VALUE_TYPE_TEXT, s.buffer);
}
else
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Get value from agent failed: %s", zbx_socket_strerror()));
zbx_tcp_close(&s);
out:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __function_name, zbx_result_string(ret));
return ret;
}
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