1 /* 2 * Copyright (C) 2025 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef OHOS_DHCP_DNS_REPOSITORY_H 16 #define OHOS_DHCP_DNS_REPOSITORY_H 17 #include <string> 18 #include <vector> 19 #include <unordered_set> 20 #include <mutex> 21 #include "dhcp_ipv6_define.h" 22 #include "dhcp_ipv6_info.h" 23 namespace OHOS { 24 namespace DHCP { 25 class DnsServerRepository { 26 private: 27 static const int NUM_CURRENT_SERVERS = 3; 28 static const int NUM_SERVERS = 12; 29 static const int DEFAULT_MIN_RDNSS_LIFETIME = 120; 30 std::unordered_set<std::string> currentServers_; // curent use server 31 std::vector<DnsServerEntry> allServers_; // all existing server 32 uint32_t minLifetime_ = DEFAULT_MIN_RDNSS_LIFETIME; 33 std::mutex mutex; 34 35 public: 36 DnsServerRepository(int minLifeTime = DEFAULT_MIN_RDNSS_LIFETIME); 37 ~DnsServerRepository(); 38 bool Clear(); // clear all dns server info 39 bool AddServers(uint32_t lifetime, const std::vector<std::string>& addresses); // add new dns server info 40 bool SetCurrentServers(DhcpIpv6Info &ipv6Info); //set current servers to ipv6Info 41 private: 42 bool UpdateExistingEntry(const std::string& address, uint64_t expiry); 43 bool UpdateCurrentServers(); 44 }; 45 } 46 } 47 #endif