| /* |
| * |
| * Copyright (c) 2020 Project CHIP Authors |
| * Copyright (c) 2017 Nest Labs, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @file |
| * This file defines the AsyncDNSResolver, the object that performs |
| * Asynchronous Domain Name System (DNS) resolution in InetLayer. |
| * |
| */ |
| #pragma once |
| |
| #include <inet/IPAddress.h> |
| #include <inet/InetError.h> |
| |
| #if INET_CONFIG_ENABLE_DNS_RESOLVER |
| #include <inet/DNSResolver.h> |
| #endif // INET_CONFIG_ENABLE_DNS_RESOLVER |
| |
| #if CHIP_SYSTEM_CONFIG_USE_SOCKETS |
| #if INET_CONFIG_ENABLE_DNS_RESOLVER && INET_CONFIG_ENABLE_ASYNC_DNS_SOCKETS |
| #include <netdb.h> |
| #include <pthread.h> |
| #include <semaphore.h> |
| |
| namespace chip { |
| namespace Inet { |
| |
| /** |
| * @class AsyncDNSResolverSockets |
| * |
| * @brief |
| * This is an internal class to InetLayer that provides helper APIs for |
| * Asynchronous Domain Name System (DNS) resolution in InetLayer. |
| * There is no public interface available for the application layer. |
| * |
| */ |
| class AsyncDNSResolverSockets |
| { |
| friend class InetLayer; |
| friend class DNSResolver; |
| |
| public: |
| INET_ERROR EnqueueRequest(DNSResolver & resolver); |
| |
| INET_ERROR Init(InetLayer * inet); |
| |
| INET_ERROR Cancel(DNSResolver & resolver); |
| |
| INET_ERROR Shutdown(); |
| |
| INET_ERROR PrepareDNSResolver(DNSResolver & resolver, const char * hostName, uint16_t hostNameLen, uint8_t options, |
| uint8_t maxAddrs, IPAddress * addrArray, DNSResolver::OnResolveCompleteFunct onComplete, |
| void * appState); |
| |
| private: |
| pthread_t mAsyncDNSThreadHandle[INET_CONFIG_DNS_ASYNC_MAX_THREAD_COUNT]; |
| pthread_mutex_t mAsyncDNSMutex; /* Mutex for accessing the DNSResolver queue. */ |
| pthread_cond_t mAsyncDNSCondVar; /* Condition Variable for thread synchronization. */ |
| volatile DNSResolver * mAsyncDNSQueueHead; /* The head of the asynchronous DNSResolver object queue. */ |
| volatile DNSResolver * mAsyncDNSQueueTail; /* The tail of the asynchronous DNSResolver object queue. */ |
| InetLayer * mInet; /* The pointer to the InetLayer. */ |
| static void |
| DNSResultEventHandler(chip::System::Layer * aLayer, void * aAppState, |
| chip::System::Error aError); /* Timer event handler function for asynchronous DNS notification */ |
| |
| INET_ERROR DequeueRequest(DNSResolver ** outResolver); |
| |
| bool ShouldThreadShutdown(); |
| |
| void Resolve(DNSResolver & resolver); |
| |
| void UpdateDNSResult(DNSResolver & resolver, struct addrinfo * lookupRes); |
| |
| static void * AsyncDNSThreadRun(void * args); |
| |
| static void NotifyChipThread(DNSResolver * resolver); |
| |
| void AsyncMutexLock(); |
| |
| void AsyncMutexUnlock(); |
| }; |
| |
| } // namespace Inet |
| } // namespace chip |
| #endif // INET_CONFIG_ENABLE_DNS_RESOLVER && INET_CONFIG_ENABLE_ASYNC_DNS_SOCKETS |
| #endif // CHIP_SYSTEM_CONFIG_USE_SOCKETS |