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/*
** Zabbix
** Copyright (C) 2001-2022 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 "trapper_expressions_evaluate.h"
#include "zbxalgo.h"
#include "zbxnum.h"
#include "dbcache.h"
#include "trapper_auth.h"
#include "zbxcommshigh.h"
static int trapper_parse_expressions_evaluate(const struct zbx_json_parse *jp, zbx_vector_ptr_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_ptr_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);
return ret;
}
static int trapper_expressions_evaluate_run(const struct zbx_json_parse *jp, struct zbx_json *json, char **error)
{
int ret = FAIL, i;
zbx_vector_ptr_t expressions;
zbx_timespec_t ts;
zbx_vector_ptr_create(&expressions);
if (FAIL == trapper_parse_expressions_evaluate(jp, &expressions, error))
goto out;
zbx_json_addstring(json, ZBX_PROTO_TAG_RESPONSE, "success", ZBX_JSON_TYPE_STRING);
zbx_json_addarray(json, ZBX_PROTO_TAG_DATA);
zbx_timespec(&ts);
for (i = 0; i < expressions.values_num; i++)
{
double expr_result;
char *errmsg = NULL;
zbx_json_addobject(json, NULL);
zbx_json_addstring(json, ZBX_PROTO_TAG_EXPRESSION, expressions.values[i], ZBX_JSON_TYPE_STRING);
if (SUCCEED != trapper_expression_evaluate(expressions.values[i], &ts, &expr_result, &errmsg))
{
zbx_json_addstring(json, ZBX_PROTO_TAG_ERROR, errmsg, ZBX_JSON_TYPE_STRING);
zbx_free(errmsg);
}
else
{
zbx_uint64_t res = (ZBX_INFINITY == expr_result ||
SUCCEED == zbx_double_compare(expr_result, 0.0)) ? 0 : 1;
zbx_json_adduint64(json, ZBX_PROTO_TAG_VALUE, res);
}
zbx_json_close(json);
}
zbx_json_close(json);
ret = SUCCEED;
out:
zbx_vector_ptr_clear_ext(&expressions, (zbx_clean_func_t)zbx_ptr_free);
zbx_vector_ptr_destroy(&expressions);
return ret;
}
int zbx_trapper_expressions_evaluate(zbx_socket_t *sock, const struct zbx_json_parse *jp)
{
char *error = NULL;
int ret;
struct zbx_json json;
zbx_json_init(&json, 1024);
if (SUCCEED == (ret = trapper_expressions_evaluate_run(jp, &json, &error)))
{
zbx_tcp_send_bytes_to(sock, json.buffer, json.buffer_size, CONFIG_TIMEOUT);
}
else
{
zbx_send_response(sock, ret, error, CONFIG_TIMEOUT);
zbx_free(error);
}
zbx_json_free(&json);
return ret;
}
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