upload android base code part6

android/system/netd/server/TetherController.h

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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef _TETHER_CONTROLLER_H
+#define _TETHER_CONTROLLER_H
+
+#include <netinet/in.h>
+
+#include <list>
+#include <set>
+#include <string>
+
+namespace android {
+namespace net {
+
+class TetherController {
+private:
+    std::list<std::string> mInterfaces;
+    // NetId to use for forwarded DNS queries. This may not be the default
+    // network, e.g., in the case where we are tethering to a DUN APN.
+    unsigned               mDnsNetId;
+    std::list<std::string> mDnsForwarders;
+    pid_t                  mDaemonPid;
+    int                    mDaemonFd;
+    std::set<std::string>  mForwardingRequests;
+
+public:
+    TetherController();
+    virtual ~TetherController();
+
+    bool enableForwarding(const char* requester);
+    bool disableForwarding(const char* requester);
+    size_t forwardingRequestCount();
+
+    int startTethering(int num_addrs, char **dhcp_ranges);
+    int stopTethering();
+    bool isTetheringStarted();
+
+    unsigned getDnsNetId();
+    int setDnsForwarders(unsigned netId, char **servers, int numServers);
+    const std::list<std::string> &getDnsForwarders() const;
+
+    int tetherInterface(const char *interface);
+    int untetherInterface(const char *interface);
+    const std::list<std::string> &getTetheredInterfaceList() const;
+    bool applyDnsInterfaces();
+
+private:
+    bool setIpFwdEnabled();
+};
+
+}  // namespace net
+}  // namespace android
+
+#endif