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 
26 typedef std::list<char *> InterfaceCollection;
27 typedef std::list<std::string> NetAddressCollection;
28 
29 class TetherController {
30     InterfaceCollection  *mInterfaces;
31     // NetId to use for forwarded DNS queries. This may not be the default
32     // network, e.g., in the case where we are tethering to a DUN APN.
33     unsigned              mDnsNetId;
34     NetAddressCollection *mDnsForwarders;
35     pid_t                 mDaemonPid;
36     int                   mDaemonFd;
37     std::set<std::string> mForwardingRequests;
38 
39 public:
40     TetherController();
41     virtual ~TetherController();
42 
43     bool enableForwarding(const char* requester);
44     bool disableForwarding(const char* requester);
45     size_t forwardingRequestCount();
46 
47     int startTethering(int num_addrs, char **dhcp_ranges);
48     int stopTethering();
49     bool isTetheringStarted();
50 
51     unsigned getDnsNetId();
52     int setDnsForwarders(unsigned netId, char **servers, int numServers);
53     NetAddressCollection *getDnsForwarders();
54 
55     int tetherInterface(const char *interface);
56     int untetherInterface(const char *interface);
57     InterfaceCollection *getTetheredInterfaceList();
58 
59 private:
60     int applyDnsInterfaces();
61     bool setIpFwdEnabled();
62 };
63 
64 #endif
65