| /* |
| * Copyright (C) 2004-2023 Savoir-faire Linux Inc. |
| * |
| * 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 3 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, see <https://www.gnu.org/licenses/>. |
| */ |
| #pragma once |
| |
| #include "../upnp_protocol.h" |
| #include "../igd.h" |
| #include "pmp_igd.h" |
| #include "ip_utils.h" |
| |
| // uncomment to enable native natpmp error messages |
| //#define ENABLE_STRNATPMPERR 1 |
| #include <natpmp.h> |
| |
| #include <atomic> |
| #include <thread> |
| |
| namespace dhtnet { |
| class IpAddr; |
| } |
| |
| namespace dhtnet { |
| namespace upnp { |
| |
| // Requested lifetime in seconds. The actual lifetime might be different. |
| constexpr static unsigned int MAPPING_ALLOCATION_LIFETIME {60 * 60}; |
| // Max number of IGD search attempts before failure. |
| constexpr static unsigned int MAX_RESTART_SEARCH_RETRIES {3}; |
| // Time-out between two successive read response. |
| constexpr static auto TIMEOUT_BEFORE_READ_RETRY {std::chrono::milliseconds(300)}; |
| // Max number of read attempts before failure. |
| constexpr static unsigned int MAX_READ_RETRIES {3}; |
| // Base unit for the timeout between two successive IGD search. |
| constexpr static auto NATPMP_SEARCH_RETRY_UNIT {std::chrono::seconds(10)}; |
| |
| class NatPmp : public UPnPProtocol |
| { |
| public: |
| NatPmp(const std::shared_ptr<asio::io_context>& ctx, const std::shared_ptr<dht::log::Logger>& logger); |
| ~NatPmp(); |
| |
| // Set the observer. |
| void setObserver(UpnpMappingObserver* obs) override; |
| |
| // Returns the protocol type. |
| NatProtocolType getProtocol() const override { return NatProtocolType::NAT_PMP; } |
| |
| // Get protocol type as string. |
| char const* getProtocolName() const override { return "NAT-PMP"; } |
| |
| // Notifies a change in network. |
| void clearIgds() override; |
| |
| // Renew pmp_igd. |
| void searchForIgd() override; |
| |
| // Get the IGD list. |
| std::list<std::shared_ptr<IGD>> getIgdList() const override; |
| |
| // Return true if it has at least one valid IGD. |
| bool isReady() const override; |
| |
| // Request a new mapping. |
| void requestMappingAdd(const Mapping& mapping) override; |
| |
| // Renew an allocated mapping. |
| void requestMappingRenew(const Mapping& mapping) override; |
| |
| // Removes a mapping. |
| void requestMappingRemove(const Mapping& mapping) override; |
| |
| // Get the host (local) address. |
| const IpAddr getHostAddress() const override; |
| |
| // Terminate. Nothing to do here, the clean-up is done when |
| // the IGD is cleared. |
| void terminate() override; |
| |
| private: |
| NatPmp& operator=(const NatPmp&) = delete; |
| NatPmp(const NatPmp&) = delete; |
| |
| std::weak_ptr<NatPmp> weak() { return std::static_pointer_cast<NatPmp>(shared_from_this()); } |
| |
| void terminate(std::condition_variable& cv); |
| |
| void initNatPmp(); |
| void getIgdPublicAddress(); |
| void removeAllMappings(); |
| int readResponse(natpmp_t& handle, natpmpresp_t& response); |
| int sendMappingRequest(const Mapping& mapping, uint32_t& lifetime); |
| |
| // Adds a port mapping. |
| int addPortMapping(Mapping& mapping); |
| // Removes a port mapping. |
| void removePortMapping(Mapping& mapping); |
| |
| // True if the error is fatal. |
| bool isErrorFatal(int error); |
| // Gets NAT-PMP error code string. |
| const char* getNatPmpErrorStr(int errorCode) const; |
| // Get local getaway. |
| std::unique_ptr<IpAddr> getLocalGateway() const; |
| |
| // Helpers to process user's callbacks |
| void processIgdUpdate(UpnpIgdEvent event); |
| void processMappingAdded(const Mapping& map); |
| void processMappingRequestFailed(const Mapping& map); |
| void processMappingRenewed(const Mapping& map); |
| void processMappingRemoved(const Mapping& map); |
| |
| // Check if the IGD has a local match |
| bool validIgdInstance(const std::shared_ptr<IGD>& igdIn); |
| |
| // Increment errors counter. |
| void incrementErrorsCounter(const std::shared_ptr<IGD>& igd); |
| |
| std::atomic_bool initialized_ {false}; |
| |
| // Data members |
| std::shared_ptr<PMPIGD> igd_; |
| natpmp_t natpmpHdl_; |
| std::shared_ptr<asio::io_context> ioContext; |
| asio::steady_timer searchForIgdTimer_; |
| unsigned int igdSearchCounter_ {0}; |
| UpnpMappingObserver* observer_ {nullptr}; |
| IpAddr hostAddress_ {}; |
| |
| // Calls from other threads that does not need synchronous access are |
| // rescheduled on the NatPmp private queue. This will avoid the need to |
| // protect most of the data members of this class. |
| // For some internal members (such as the igd instance and the host |
| // address) that need to be synchronously accessed, are protected by |
| // this mutex. |
| mutable std::mutex natpmpMutex_; |
| |
| // Shutdown synchronization |
| bool shutdownComplete_ {false}; |
| }; |
| |
| } // namespace upnp |
| } // namespace dhtnet |