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 "zbxstr.h"

#include "zbxlog.h"

#include "zbxhttp.h"

#include "zbxtypes.h"

#include "zbxalgo.h"

#include "zbxexpr.h"

​

static int  str_loc_cmp(const char *src, const zbx_strloc_t *loc, const char *text, size_t text_len)

{

    ZBX_RETURN_IF_NOT_EQUAL(loc->r - loc->l + 1, text_len);

​

    return zbx_strncasecmp(src + loc->l, text, text_len);

}

​

static char *str_loc_dup(const char *src, const zbx_strloc_t *loc)

{

    char    *str;

    size_t  len;

​

    len = loc->r - loc->l + 1;

    str = zbx_malloc(NULL, len + 1);

    memcpy(str, src + loc->l, len);

    str[len] = '\0';

​

    return str;

}

​

#define ZBX_ATTRIBUTE_NAME_CHARLIST " \"'=<>`/"

static int  parse_attribute_name(const char *data, size_t pos, zbx_strloc_t *loc)

{

    const char  *ptr = data + pos;

​

    if (NULL != strchr(ZBX_ATTRIBUTE_NAME_CHARLIST, *ptr))

        return FAIL;

​

    while (NULL == strchr(ZBX_ATTRIBUTE_NAME_CHARLIST, *(++ptr)))

        ;

​

    loc->l = pos;

    loc->r = (size_t)(ptr - data) - 1;

​

    return SUCCEED;

}

#undef ZBX_ATTRIBUTE_NAME_CHARLIST

​

static size_t   skip_spaces(const char *data, size_t pos)

{

    while (' ' == data[pos] || '\t' == data[pos])

        pos++;

​

    return pos;

}

​

static int  parse_attribute_op(const char *data, size_t pos, zbx_strloc_t *loc)

{

    if ('=' == data[pos])

    {

        loc->l = pos;

        loc->r = pos;

​

        return SUCCEED;

    }

​

    return FAIL;

}

​

#define ZBX_UNQUOTED_ATTRIBUTE_VALUE_CHARLIST   " \"'=<>`"

static int  parse_attribute_value(const char *data, size_t pos, zbx_strloc_t *loc)

{

    const char  *ptr;

    char        *charlist;

    unsigned char   quoted;

​

    ptr = data + pos;

​

    if ('"' == *ptr)

    {