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 "trapper_expressions_evaluate.h"

​

#include "zbxtrapper.h"

#include "zbxalgo.h"

#include "zbxnum.h"

#include "zbxcommshigh.h"

#include "zbxdbhigh.h"

#include "zbxtime.h"

#include "zbxeval.h"

#include "zbxjson.h"

​

static int  trapper_parse_expressions_evaluate(const struct zbx_json_parse *jp, zbx_vector_str_t *expressions,

                char **error)

{

    char            buffer[MAX_STRING_LEN];

    const char      *ptr;

    zbx_user_t      user;

    int         ret = FAIL;

    struct zbx_json_parse   jp_data, jp_expressions;

​

    zbx_user_init(&user);

​

    if (FAIL == zbx_get_user_from_json(jp, &user, NULL) || USER_TYPE_ZABBIX_ADMIN > user.type)

    {

        *error = zbx_strdup(NULL, "Permission denied.");

        goto out;

    }

​

    if (FAIL == zbx_json_brackets_by_name(jp, ZBX_PROTO_TAG_DATA, &jp_data))

    {

        *error = zbx_strdup(NULL, "Missing data field.");

        goto out;

    }

​

    if (FAIL == zbx_json_brackets_by_name(&jp_data, ZBX_PROTO_TAG_EXPRESSIONS, &jp_expressions))

    {

        *error = zbx_strdup(NULL, "Missing expressions field.");

        goto out;

    }

​

    for (ptr = NULL; NULL != (ptr = zbx_json_next_value(&jp_expressions, ptr, buffer, sizeof(buffer), NULL));)

    {

        zbx_vector_str_append(expressions, zbx_strdup(NULL, buffer));

    }

​

    ret = SUCCEED;

out:

    zbx_user_free(&user);

    return ret;

}

​

static int  trapper_expression_evaluate(const char *expression, const zbx_timespec_t *ts, double *result,

        char **error)

{

    zbx_eval_context_t  ctx;

    int         ret;

    zbx_variant_t       value;

​

    if (SUCCEED != zbx_eval_parse_expression(&ctx, expression, ZBX_EVAL_PARSE_TRIGGER_EXPRESSION, error))

        return FAIL;

​

    if (SUCCEED == (ret = zbx_eval_execute(&ctx, ts, &value, error)))

    {

        if (SUCCEED == zbx_variant_convert(&value, ZBX_VARIANT_DBL))

        {

            *result = value.data.dbl;

        }

        else

        {

            *error = zbx_dsprintf(NULL, "invalid result \"%s\" of type \"%s\"",

                    zbx_variant_value_desc(&value), zbx_variant_type_desc(&value));

            zbx_variant_clear(&value);

            ret = FAIL;

        }

    }

​

    zbx_eval_clear(&ctx);