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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 "cfg.h"
#include "db.h"
#include "log.h"
#include "zbxjson.h"
#include "comms.h"
#include "servercomms.h"
extern unsigned int configured_tls_connect_mode;
#if defined(HAVE_POLARSSL) || defined(HAVE_GNUTLS) || defined(HAVE_OPENSSL)
extern char *CONFIG_TLS_SERVER_CERT_ISSUER;
extern char *CONFIG_TLS_SERVER_CERT_SUBJECT;
extern char *CONFIG_TLS_PSK_IDENTITY;
#endif
int connect_to_server(zbx_socket_t *sock, int timeout, int retry_interval)
{
int res, lastlogtime, now;
char *tls_arg1, *tls_arg2;
zabbix_log(LOG_LEVEL_DEBUG, "In connect_to_server() [%s]:%d [timeout:%d]",
CONFIG_SERVER, CONFIG_SERVER_PORT, timeout);
switch (configured_tls_connect_mode)
{
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 = CONFIG_TLS_SERVER_CERT_ISSUER;
tls_arg2 = CONFIG_TLS_SERVER_CERT_SUBJECT;
break;
case ZBX_TCP_SEC_TLS_PSK:
tls_arg1 = CONFIG_TLS_PSK_IDENTITY;
tls_arg2 = NULL; /* zbx_tls_connect() will find PSK */
break;
#endif
default:
THIS_SHOULD_NEVER_HAPPEN;
return FAIL;
}
if (FAIL == (res = zbx_tcp_connect(sock, CONFIG_SOURCE_IP, CONFIG_SERVER, CONFIG_SERVER_PORT, timeout,
configured_tls_connect_mode, tls_arg1, tls_arg2)))
{
if (0 == retry_interval)
{
zabbix_log(LOG_LEVEL_WARNING, "Unable to connect to the server [%s]:%d [%s]",
CONFIG_SERVER, CONFIG_SERVER_PORT, zbx_socket_strerror());
}
else
{
zabbix_log(LOG_LEVEL_WARNING, "Unable to connect to the server [%s]:%d [%s]. Will retry every"
" %d second(s)", CONFIG_SERVER, CONFIG_SERVER_PORT, zbx_socket_strerror(),
retry_interval);
lastlogtime = (int)time(NULL);
while (FAIL == (res = zbx_tcp_connect(sock, CONFIG_SOURCE_IP, CONFIG_SERVER, CONFIG_SERVER_PORT,
timeout, configured_tls_connect_mode, tls_arg1, tls_arg2)))
{
now = (int)time(NULL);
if (LOG_ENTRY_INTERVAL_DELAY <= now - lastlogtime)
{
zabbix_log(LOG_LEVEL_WARNING, "Still unable to connect...");
lastlogtime = now;
}
sleep(retry_interval);
}
zabbix_log(LOG_LEVEL_WARNING, "Connection restored.");
}
}
return res;
}
void disconnect_server(zbx_socket_t *sock)
{
zbx_tcp_close(sock);
}
/******************************************************************************
* *
* Function: get_data_from_server *
* *
* Purpose: get configuration and other data from server *
* *
* Return value: SUCCEED - processed successfully *
* FAIL - an error occurred *
* *
******************************************************************************/
int get_data_from_server(zbx_socket_t *sock, const char *request, char **error)
{
const char *__function_name = "get_data_from_server";
int ret = FAIL;
struct zbx_json j;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() request:'%s'", __function_name, request);
zbx_json_init(&j, 128);
zbx_json_addstring(&j, "request", request, ZBX_JSON_TYPE_STRING);
zbx_json_addstring(&j, "host", CONFIG_HOSTNAME, ZBX_JSON_TYPE_STRING);
zbx_json_addstring(&j, ZBX_PROTO_TAG_VERSION, ZABBIX_VERSION, ZBX_JSON_TYPE_STRING);
if (SUCCEED != zbx_tcp_send_ext(sock, j.buffer, strlen(j.buffer), ZBX_TCP_PROTOCOL | ZBX_TCP_COMPRESS, 0))
{
*error = zbx_strdup(*error, zbx_socket_strerror());
goto exit;
}
if (SUCCEED != zbx_tcp_recv(sock))
{
*error = zbx_strdup(*error, zbx_socket_strerror());
goto exit;
}
zabbix_log(LOG_LEVEL_DEBUG, "Received [%s] from server", sock->buffer);
ret = SUCCEED;
exit:
zbx_json_free(&j);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __function_name, zbx_result_string(ret));
return ret;
}
/******************************************************************************
* *
* Function: put_data_to_server *
* *
* Purpose: send data to server *
* *
* Return value: SUCCEED - processed successfully *
* FAIL - an error occurred *
* *
******************************************************************************/
int put_data_to_server(zbx_socket_t *sock, struct zbx_json *j, char **error)
{
const char *__function_name = "put_data_to_server";
int ret = FAIL;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() datalen:" ZBX_FS_SIZE_T, __function_name, (zbx_fs_size_t)j->buffer_size);
if (SUCCEED != zbx_tcp_send_ext(sock, j->buffer, strlen(j->buffer), ZBX_TCP_PROTOCOL | ZBX_TCP_COMPRESS, 0))
{
*error = zbx_strdup(*error, zbx_socket_strerror());
goto out;
}
if (SUCCEED != zbx_recv_response(sock, 0, error))
goto out;
ret = SUCCEED;
out:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __function_name, zbx_result_string(ret));
return ret;
}
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