1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef _TETHER_CONTROLLER_H
18#define _TETHER_CONTROLLER_H
19
20#include <netinet/in.h>
21
22#include <list>
23#include <set>
24#include <string>
25
26namespace android {
27namespace net {
28
29class TetherController {
30private:
31    std::list<std::string> mInterfaces;
32    // NetId to use for forwarded DNS queries. This may not be the default
33    // network, e.g., in the case where we are tethering to a DUN APN.
34    unsigned               mDnsNetId;
35    std::list<std::string> mDnsForwarders;
36    pid_t                  mDaemonPid;
37    int                    mDaemonFd;
38    std::set<std::string>  mForwardingRequests;
39
40public:
41    TetherController();
42    virtual ~TetherController();
43
44    bool enableForwarding(const char* requester);
45    bool disableForwarding(const char* requester);
46    size_t forwardingRequestCount();
47
48    int startTethering(int num_addrs, char **dhcp_ranges);
49    int stopTethering();
50    bool isTetheringStarted();
51
52    unsigned getDnsNetId();
53    int setDnsForwarders(unsigned netId, char **servers, int numServers);
54    const std::list<std::string> &getDnsForwarders() const;
55
56    int tetherInterface(const char *interface);
57    int untetherInterface(const char *interface);
58    const std::list<std::string> &getTetheredInterfaceList() const;
59    bool applyDnsInterfaces();
60
61private:
62    bool setIpFwdEnabled();
63};
64
65}  // namespace net
66}  // namespace android
67
68#endif
69