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/*
** Zabbix
** Copyright (C) 2001-2020 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 "zbxjson.h"
#include "log.h"
/******************************************************************************
* *
* Function: zbx_send_response *
* *
* Purpose: send json SUCCEED or FAIL to socket along with an info message *
* *
* Parameters: sock - [IN] socket descriptor *
* result - [IN] SUCCEED or FAIL *
* info - [IN] info message (optional) *
* version - [IN] the version data (optional) *
* protocol - [IN] the transport protocol *
* timeout - [IN] timeout for this operation *
* *
* Return value: SUCCEED - data successfully transmitted *
* NETWORK_ERROR - network related error occurred *
* *
* Author: Alexander Vladishev, Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
int zbx_send_response_ext(zbx_socket_t *sock, int result, const char *info, const char *version, int protocol,
int timeout)
{
struct zbx_json json;
const char *resp;
int ret = SUCCEED;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
zbx_json_init(&json, ZBX_JSON_STAT_BUF_LEN);
resp = SUCCEED == result ? ZBX_PROTO_VALUE_SUCCESS : ZBX_PROTO_VALUE_FAILED;
zbx_json_addstring(&json, ZBX_PROTO_TAG_RESPONSE, resp, ZBX_JSON_TYPE_STRING);
if (NULL != info && '\0' != *info)
zbx_json_addstring(&json, ZBX_PROTO_TAG_INFO, info, ZBX_JSON_TYPE_STRING);
if (NULL != version)
zbx_json_addstring(&json, ZBX_PROTO_TAG_VERSION, version, ZBX_JSON_TYPE_STRING);
zabbix_log(LOG_LEVEL_DEBUG, "%s() '%s'", __func__, json.buffer);
if (FAIL == (ret = zbx_tcp_send_ext(sock, json.buffer, strlen(json.buffer), protocol, timeout)))
{
zabbix_log(LOG_LEVEL_DEBUG, "Error sending result back: %s", zbx_socket_strerror());
ret = NETWORK_ERROR;
}
zbx_json_free(&json);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __func__, zbx_result_string(ret));
return ret;
}
/******************************************************************************
* *
* Function: zbx_recv_response *
* *
* Purpose: read a response message (in JSON format) from socket, optionally *
* extract "info" value. *
* *
* Parameters: sock - [IN] socket descriptor *
* timeout - [IN] timeout for this operation *
* error - [OUT] pointer to error message *
* *
* Return value: SUCCEED - "response":"success" successfully retrieved *
* FAIL - otherwise *
* Comments: *
* Allocates memory. *
* *
* If an error occurs, the function allocates dynamic memory for an error *
* message and writes its address into location pointed to by "error" *
* parameter. *
* *
* When the "info" value is present in the response message then function *
* copies the "info" value into the "error" buffer as additional *
* information *
* *
* IMPORTANT: it is a responsibility of the caller to release the *
* "error" memory ! *
* *
******************************************************************************/
int zbx_recv_response(zbx_socket_t *sock, int timeout, char **error)
{
struct zbx_json_parse jp;
char value[16];
int ret = FAIL;
zabbix_log(LOG_LEVEL_DEBUG, "In %s()", __func__);
if (SUCCEED != zbx_tcp_recv_to(sock, timeout))
{
/* since we have successfully sent data earlier, we assume the other */
/* side is just too busy processing our data if there is no response */
*error = zbx_strdup(*error, zbx_socket_strerror());
goto out;
}
zabbix_log(LOG_LEVEL_DEBUG, "%s() '%s'", __func__, sock->buffer);
/* deal with empty string here because zbx_json_open() does not produce an error message in this case */
if ('\0' == *sock->buffer)
{
*error = zbx_strdup(*error, "empty string received");
goto out;
}
if (SUCCEED != zbx_json_open(sock->buffer, &jp))
{
*error = zbx_strdup(*error, zbx_json_strerror());
goto out;
}
if (SUCCEED != zbx_json_value_by_name(&jp, ZBX_PROTO_TAG_RESPONSE, value, sizeof(value), NULL))
{
*error = zbx_strdup(*error, "no \"" ZBX_PROTO_TAG_RESPONSE "\" tag");
goto out;
}
if (0 != strcmp(value, ZBX_PROTO_VALUE_SUCCESS))
{
char *info = NULL;
size_t info_alloc = 0;
if (SUCCEED == zbx_json_value_by_name_dyn(&jp, ZBX_PROTO_TAG_INFO, &info, &info_alloc, NULL))
*error = zbx_strdup(*error, info);
else
*error = zbx_dsprintf(*error, "negative response \"%s\"", value);
zbx_free(info);
goto out;
}
ret = SUCCEED;
out:
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%s", __func__, zbx_result_string(ret));
return ret;
}
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