1 /*
2  * Copyright (c) 2023 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 
16 #ifndef NET_VPN_MANAGER_H
17 #define NET_VPN_MANAGER_H
18 
19 #include <cstdint>
20 #include <linux/if.h>
21 #include <string>
22 
23 namespace OHOS {
24 namespace NetManagerStandard {
25 class VpnManager {
26 private:
27     VpnManager() = default;
28     ~VpnManager() = default;
29     VpnManager(const VpnManager &) = delete;
30     VpnManager &operator=(const VpnManager &) = delete;
31 
32 public:
GetInstance()33     static VpnManager &GetInstance()
34     {
35         static VpnManager instance;
36         return instance;
37     }
38 
39 public:
40     int32_t CreateVpnInterface();
41     void DestroyVpnInterface();
42     int32_t SetVpnMtu(const std::string &ifName, int32_t mtu);
43     int32_t SetVpnAddress(const std::string &ifName, const std::string &tunAddr, int32_t prefix);
44 
45 private:
46     int32_t SetVpnUp();
47     int32_t SetVpnDown();
48     int32_t InitIfreq(ifreq &ifr, const std::string &cardName);
49     int32_t SetVpnResult(std::atomic_int &fd, unsigned long cmd, ifreq &ifr);
50 
51     int32_t SendVpnInterfaceFdToClient(int32_t clientFd, int32_t tunFd);
52     void StartUnixSocketListen();
53     void StartVpnInterfaceFdListen();
54 
55 private:
56     std::atomic_int tunFd_ = 0;
57     std::atomic_int net4Sock_ = 0;
58     std::atomic_int net6Sock_ = 0;
59     std::atomic_bool listeningFlag_ = false;
60 };
61 } // namespace NetManagerStandard
62 } // namespace OHOS
63 #endif // NET_VPN_MANAGER_H
64