Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 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 envied 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 "zbxembed.h"

#include "embed_xml.h"

#include "embed.h"

​

#include "log.h"

#include "httprequest.h"

#include "zabbix.h"

#include "global.h"

#include "console.h"

#include "zbxstr.h"

​

#define ZBX_ES_MEMORY_LIMIT (1024 * 1024 * 512)

#define ZBX_ES_STACK_LIMIT  1000

​

/* maximum number of consequent runtime errors after which it's treated as fatal error */

#define ZBX_ES_MAX_CONSEQUENT_RT_ERROR  3

​

#define ZBX_ES_SCRIPT_HEADER    "function(value){"

#define ZBX_ES_SCRIPT_FOOTER    "\n}"

​

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

 *                                                                            *

 * Purpose: fatal error handler                                               *

 *                                                                            *

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

static void es_handle_error(void *udata, const char *msg)

{

    zbx_es_env_t    *env = (zbx_es_env_t *)udata;

​

    zabbix_log(LOG_LEVEL_WARNING, "Cannot process javascript, fatal error: %s", msg);

​

    env->fatal_error = 1;

    env->error = zbx_strdup(env->error, msg);

    longjmp(env->loc, 1);

}

​

/*

 * Memory allocation routines to track and limit script memory usage.

 */

​

static void *es_malloc(void *udata, duk_size_t size)

{

    zbx_es_env_t    *env = (zbx_es_env_t *)udata;

    uint64_t    *uptr;

​

    if (env->total_alloc + size + 8 > env->max_total_alloc)

        env->max_total_alloc = env->total_alloc + size + 8;

​

    if (env->total_alloc + size + 8 > ZBX_ES_MEMORY_LIMIT)

    {

        if (NULL == env->ctx)

            env->error = zbx_strdup(env->error, "cannot allocate memory");

​

        return NULL;

    }

​

    env->total_alloc += (size + 8);

    uptr = zbx_malloc(NULL, size + 8);

    *uptr++ = size;

​

    return uptr;

}

​

static void *es_realloc(void *udata, void *ptr, duk_size_t size)

{

    zbx_es_env_t    *env = (zbx_es_env_t *)udata;

    uint64_t    *uptr = ptr;

    size_t      old_size;

​

    if (NULL != uptr)

    {

        --uptr;