Merge "Delete NetworkManagementSocketTagger."

/*

 * Copyright (C) 2011 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.

 */

package com.android.server;

import android.os.StrictMode;

import android.util.Log;

import dalvik.system.SocketTagger;

import java.io.FileDescriptor;

import java.net.SocketException;

/**

 * Assigns tags to sockets for traffic stats.

 * @hide

 */

public final class NetworkManagementSocketTagger extends SocketTagger {

    private static final String TAG = "NetworkManagementSocketTagger";

    private static final boolean LOGD = false;

    private static ThreadLocal<SocketTags> threadSocketTags = new ThreadLocal<SocketTags>() {

        @Override

        protected SocketTags initialValue() {

            return new SocketTags();

        }

    };

    public static void install() {

        SocketTagger.set(new NetworkManagementSocketTagger());

    }

    public static int setThreadSocketStatsTag(int tag) {

        final int old = threadSocketTags.get().statsTag;

        threadSocketTags.get().statsTag = tag;

        return old;

    }

    public static int getThreadSocketStatsTag() {

        return threadSocketTags.get().statsTag;

    }

    public static int setThreadSocketStatsUid(int uid) {

        final int old = threadSocketTags.get().statsUid;

        threadSocketTags.get().statsUid = uid;

        return old;

    }

    public static int getThreadSocketStatsUid() {

        return threadSocketTags.get().statsUid;

    }

    @Override

    public void tag(FileDescriptor fd) throws SocketException {

        final SocketTags options = threadSocketTags.get();

        if (LOGD) {

            Log.d(TAG, "tagSocket(" + fd.getInt$() + ") with statsTag=0x"

                    + Integer.toHexString(options.statsTag) + ", statsUid=" + options.statsUid);

        }

        if (options.statsTag == -1) {

            StrictMode.noteUntaggedSocket();

        }

        // TODO: skip tagging when options would be no-op

        tagSocketFd(fd, options.statsTag, options.statsUid);

    }

    private void tagSocketFd(FileDescriptor fd, int tag, int uid) {

        if (tag == -1 && uid == -1) return;

        final int errno = native_tagSocketFd(fd, tag, uid);

        if (errno < 0) {

            Log.i(TAG, "tagSocketFd(" + fd.getInt$() + ", "

                    + tag + ", "

                    + uid + ") failed with errno" + errno);

        }

    }

    @Override

    public void untag(FileDescriptor fd) throws SocketException {

        if (LOGD) {

            Log.i(TAG, "untagSocket(" + fd.getInt$() + ")");

        }

        unTagSocketFd(fd);

    }

    private void unTagSocketFd(FileDescriptor fd) {

        final SocketTags options = threadSocketTags.get();

        if (options.statsTag == -1 && options.statsUid == -1) return;

        final int errno = native_untagSocketFd(fd);

        if (errno < 0) {

            Log.w(TAG, "untagSocket(" + fd.getInt$() + ") failed with errno " + errno);

        }

    }

    public static class SocketTags {

        public int statsTag = -1;

        public int statsUid = -1;

    }

    private static native int native_tagSocketFd(FileDescriptor fd, int tag, int uid);

    private static native int native_untagSocketFd(FileDescriptor fd);

}