libddwaf-src 2.1.0

Source distribution and build integration for DataDog/libddwaf
Documentation 
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// Unless explicitly stated otherwise all files in this repository are
// dual-licensed under the Apache-2.0 License or BSD-3-Clause License.
//
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2021 Datadog, Inc.

#pragma once

#include <cstddef>
#include <memory>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>

#include "clock.hpp"
#include "condition/base.hpp"
#include "context_allocator.hpp"
#include "exclusion/common.hpp"
#include "matcher/base.hpp"
#include "object_store.hpp"
#include "target_address.hpp"

namespace ddwaf {

class expression {
public:
    struct cache_type {
        bool result{false};
        memory::vector<condition_cache> conditions;
    };

    expression() = default;

    explicit expression(std::vector<std::unique_ptr<base_condition>> &&conditions)
        : conditions_(std::move(conditions))
    {}

    bool eval(cache_type &cache, const object_store &store, const object_set_ref &objects_excluded,
        const matcher_mapper &dynamic_matchers, ddwaf::timer &deadline) const;

    void get_addresses(std::unordered_map<target_index, std::string> &addresses) const
    {
        for (const auto &cond : conditions_) { cond->get_addresses(addresses); }
    }

    static std::vector<condition_match> get_matches(cache_type &cache)
    {
        std::vector<condition_match> matches;
        matches.reserve(cache.conditions.size());
        for (auto &cond_cache : cache.conditions) {
            if (cond_cache.match.has_value()) {
                matches.emplace_back(cond_cache.match.value());
            }
        }
        return matches;
    }

    static bool get_result(cache_type &cache) { return cache.result; }

    [[nodiscard]] bool empty() const { return conditions_.empty(); }
    [[nodiscard]] std::size_t size() const { return conditions_.size(); }

protected:
    std::vector<std::unique_ptr<base_condition>> conditions_;
};

} // namespace ddwaf