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79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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/*
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Copyright (C) 2023 The Falco Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#pragma once
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#include <string>
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#include "filter_ruleset.h"
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/*!
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\brief Represents a given data source used by the engine.
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The ruleset of a source should be created through the ruleset factory
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of the same data source.
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*/
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struct falco_source {
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falco_source() = default;
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falco_source(falco_source&&) = default;
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falco_source& operator=(falco_source&&) = default;
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falco_source(const falco_source& s):
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name(s.name),
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ruleset(s.ruleset),
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ruleset_factory(s.ruleset_factory),
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filter_factory(s.filter_factory),
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formatter_factory(s.formatter_factory) {};
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falco_source& operator=(const falco_source& s) {
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name = s.name;
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ruleset = s.ruleset;
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ruleset_factory = s.ruleset_factory;
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filter_factory = s.filter_factory;
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formatter_factory = s.formatter_factory;
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return *this;
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};
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std::string name;
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std::shared_ptr<filter_ruleset> ruleset;
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std::shared_ptr<filter_ruleset_factory> ruleset_factory;
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std::shared_ptr<sinsp_filter_factory> filter_factory;
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std::shared_ptr<sinsp_evt_formatter_factory> formatter_factory;
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// Used by the filter_ruleset interface. Filled in when a rule
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// matches an event.
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mutable std::vector<falco_rule> m_rules;
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inline bool is_valid_lhs_field(const std::string& field) const {
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// if there's at least one parenthesis we may be parsing a field
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// wrapped inside one or more transformers. In those cases, the most
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// rigorous analysis we can do is compiling a simple filter using
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// the field as left-hand side of a comparison, and see if any error
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// occurs.
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if(field.find('(') != std::string::npos) {
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try {
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auto filter = field;
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filter.append(" exists");
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sinsp_filter_compiler(filter_factory, filter).compile();
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return true;
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} catch(...) {
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return false;
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}
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}
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// otherwise, simply attempt creating a filtercheck with the given
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// field name and see if we succeed
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return filter_factory->new_filtercheck(field.c_str()) != nullptr;
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}
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};
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