/*
 * Copyright (C) 2007 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 android.net;

import dalvik.system.BlockGuard;

import java.net.Socket;
import java.net.SocketException;

/**
 * Class that provides network traffic statistics.  These statistics include
 * bytes transmitted and received and network packets transmitted and received,
 * over all interfaces, over the mobile interface, and on a per-UID basis.
 * <p>
 * These statistics may not be available on all platforms.  If the statistics
 * are not supported by this device, {@link #UNSUPPORTED} will be returned.
 */
public class TrafficStats {
    /**
     * The return value to indicate that the device does not support the statistic.
     */
    public final static int UNSUPPORTED = -1;

    /**
     * Set active tag to use when accounting {@link Socket} traffic originating
     * from the current thread. Only one active tag per thread is supported.
     * <p>
     * Changes only take effect during subsequent calls to
     * {@link #tagSocket(Socket)}.
     */
    public static void setThreadStatsTag(String tag) {
        BlockGuard.setThreadSocketStatsTag(tag);
    }

    public static void clearThreadStatsTag() {
        BlockGuard.setThreadSocketStatsTag(null);
    }

    /**
     * Set specific UID to use when accounting {@link Socket} traffic
     * originating from the current thread. Designed for use when performing an
     * operation on behalf of another application.
     * <p>
     * Changes only take effect during subsequent calls to
     * {@link #tagSocket(Socket)}.
     * <p>
     * To take effect, caller must hold
     * {@link android.Manifest.permission#UPDATE_DEVICE_STATS} permission.
     *
     * {@hide}
     */
    public static void setThreadStatsUid(int uid) {
        BlockGuard.setThreadSocketStatsUid(uid);
    }

    /** {@hide} */
    public static void clearThreadStatsUid() {
        BlockGuard.setThreadSocketStatsUid(-1);
    }

    /**
     * Tag the given {@link Socket} with any statistics parameters active for
     * the current thread. Subsequent calls always replace any existing
     * parameters. When finished, call {@link #untagSocket(Socket)} to remove
     * statistics parameters.
     *
     * @see #setThreadStatsTag(String)
     * @see #setThreadStatsUid(int)
     */
    public static void tagSocket(Socket socket) throws SocketException {
        BlockGuard.tagSocketFd(socket.getFileDescriptor$());
    }

    /**
     * Remove any statistics parameters from the given {@link Socket}.
     */
    public static void untagSocket(Socket socket) throws SocketException {
        BlockGuard.untagSocketFd(socket.getFileDescriptor$());
    }

    /**
     * Get the total number of packets transmitted through the mobile interface.
     *
     * @return number of packets.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getMobileTxPackets();

    /**
     * Get the total number of packets received through the mobile interface.
     *
     * @return number of packets.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getMobileRxPackets();

    /**
     * Get the total number of bytes transmitted through the mobile interface.
     *
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
      public static native long getMobileTxBytes();

    /**
     * Get the total number of bytes received through the mobile interface.
     *
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getMobileRxBytes();

    /**
     * Get the total number of packets transmitted through the specified interface.
     *
     * @return number of packets.  If the statistics are not supported by this interface,
     * {@link #UNSUPPORTED} will be returned.
     * @hide
     */
    public static native long getTxPackets(String iface);

    /**
     * Get the total number of packets received through the specified interface.
     *
     * @return number of packets.  If the statistics are not supported by this interface,
     * {@link #UNSUPPORTED} will be returned.
     * @hide
     */
    public static native long getRxPackets(String iface);

    /**
     * Get the total number of bytes transmitted through the specified interface.
     *
     * @return number of bytes.  If the statistics are not supported by this interface,
     * {@link #UNSUPPORTED} will be returned.
     * @hide
     */
    public static native long getTxBytes(String iface);

    /**
     * Get the total number of bytes received through the specified interface.
     *
     * @return number of bytes.  If the statistics are not supported by this interface,
     * {@link #UNSUPPORTED} will be returned.
     * @hide
     */
    public static native long getRxBytes(String iface);


    /**
     * Get the total number of packets sent through all network interfaces.
     *
     * @return the number of packets.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getTotalTxPackets();

    /**
     * Get the total number of packets received through all network interfaces.
     *
     * @return number of packets.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getTotalRxPackets();

    /**
     * Get the total number of bytes sent through all network interfaces.
     *
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getTotalTxBytes();

    /**
     * Get the total number of bytes received through all network interfaces.
     *
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getTotalRxBytes();

    /**
     * Get the number of bytes sent through the network for this UID.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidTxBytes(int uid);

    /**
     * Get the number of bytes received through the network for this UID.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of bytes
     */
    public static native long getUidRxBytes(int uid);

    /**
     * Get the number of packets (TCP segments + UDP) sent through
     * the network for this UID.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of packets.
     * If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidTxPackets(int uid);

    /**
     * Get the number of packets (TCP segments + UDP) received through
     * the network for this UID.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of packets
     */
    public static native long getUidRxPackets(int uid);

    /**
     * Get the number of TCP payload bytes sent for this UID.
     * This total does not include protocol and control overheads at
     * the transport and the lower layers of the networking stack.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidTcpTxBytes(int uid);

    /**
     * Get the number of TCP payload bytes received for this UID.
     * This total does not include protocol and control overheads at
     * the transport and the lower layers of the networking stack.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidTcpRxBytes(int uid);

    /**
     * Get the number of UDP payload bytes sent for this UID.
     * This total does not include protocol and control overheads at
     * the transport and the lower layers of the networking stack.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidUdpTxBytes(int uid);

    /**
     * Get the number of UDP payload bytes received for this UID.
     * This total does not include protocol and control overheads at
     * the transport and the lower layers of the networking stack.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of bytes.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidUdpRxBytes(int uid);

    /**
     * Get the number of TCP segments sent for this UID.
     * Does not include TCP control packets (SYN/ACKs/FIN/..).
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of TCP segments.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidTcpTxSegments(int uid);

    /**
     * Get the number of TCP segments received for this UID.
     * Does not include TCP control packets (SYN/ACKs/FIN/..).
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of TCP segments.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidTcpRxSegments(int uid);


    /**
     * Get the number of UDP packets sent for this UID.
     * Includes DNS requests.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of packets.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidUdpTxPackets(int uid);

    /**
     * Get the number of UDP packets received for this UID.
     * Includes DNS responses.
     * The statistics are across all interfaces.
     *
     * {@see android.os.Process#myUid()}.
     *
     * @param uid The UID of the process to examine.
     * @return number of packets.  If the statistics are not supported by this device,
     * {@link #UNSUPPORTED} will be returned.
     */
    public static native long getUidUdpRxPackets(int uid);
}