Zabbix

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** 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 Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

#include "zbxparam.h"

​

#include "zbxexpr.h"

#include "zbxnum.h"

#include "zbxstr.h"

​

/******************************************************************************

 *                                                                            *

 * Purpose: return parameter by index (num) from parameter list (param)       *

 *                                                                            *

 * Parameters:                                                                *

 *      p       - [IN]  parameter list                                        *

 *      num     - [IN]  requested parameter index                             *

 *      buf     - [OUT] pointer of output buffer                              *

 *      max_len - [IN]  size of output buffer                                 *

 *      type    - [OUT] parameter type (may be NULL)                          *

 *                                                                            *

 * Return value:                                                              *

 *      1 - requested parameter missing or buffer overflow                    *

 *      0 - requested parameter found (value - 'buf' can be empty string)     *

 *                                                                            *

 * Comments:  delimiter for parameters is ','                                 *

 *                                                                            *

 ******************************************************************************/

int zbx_get_param(const char *p, int num, char *buf, size_t max_len, zbx_request_parameter_type_t *type)

{

#define ZBX_ASSIGN_PARAM                    \

    do                          \

    {                           \

        if (buf_i == max_len)               \

            return 1;   /* buffer overflow */   \

        buf[buf_i++] = *p;              \

    }                           \

    while(0)

​

    int state;  /* 0 - init, 1 - inside quoted param, 2 - inside unquoted param */

    int array, idx = 1;

    size_t  buf_i = 0;

​

    if (NULL != type)

        *type = REQUEST_PARAMETER_TYPE_UNDEFINED;

​

    if (0 == max_len)

        return 1;   /* buffer overflow */

​

    max_len--;  /* '\0' */

​

    for (state = 0, array = 0; '\0' != *p && idx <= num; p++)

    {

        switch (state)

        {

            /* init state */

            case 0:

                if (',' == *p)

                {

                    if (0 == array)

                        idx++;

                    else if (idx == num)

                        ZBX_ASSIGN_PARAM;

                }

                else if ('"' == *p)

                {

                    state = 1;

​

                    if (idx == num)

                    {

                        if (NULL != type && REQUEST_PARAMETER_TYPE_UNDEFINED == *type)

                            *type = REQUEST_PARAMETER_TYPE_STRING;

​

                        if (0 != array)

                            ZBX_ASSIGN_PARAM;

                    }

                }

                else if ('[' == *p)

                {

                    if (idx == num)

                    {