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/*
* Copyright (C) 2015 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 static android.net.InvalidPacketException.ERROR_INVALID_IP_ADDRESS;
import static android.net.InvalidPacketException.ERROR_INVALID_PORT;
import android.annotation.IntRange;
import android.annotation.NonNull;
import android.annotation.SystemApi;
import android.util.Log;
import com.android.net.module.util.IpUtils;
import java.net.InetAddress;
/**
* Represents the actual packets that are sent by the
* {@link android.net.SocketKeepalive} API.
* @hide
*/
@SystemApi
public class KeepalivePacketData {
private static final String TAG = "KeepalivePacketData";
/** Source IP address */
@NonNull
private final InetAddress mSrcAddress;
/** Destination IP address */
@NonNull
private final InetAddress mDstAddress;
/** Source port */
private final int mSrcPort;
/** Destination port */
private final int mDstPort;
/** Packet data. A raw byte string of packet data, not including the link-layer header. */
private final byte[] mPacket;
// Note: If you add new fields, please modify the parcelling code in the child classes.
// This should only be constructed via static factory methods, such as
// nattKeepalivePacket.
/**
* A holding class for data necessary to build a keepalive packet.
*/
protected KeepalivePacketData(@NonNull InetAddress srcAddress,
@IntRange(from = 0, to = 65535) int srcPort, @NonNull InetAddress dstAddress,
@IntRange(from = 0, to = 65535) int dstPort,
@NonNull byte[] data) throws InvalidPacketException {
this.mSrcAddress = srcAddress;
this.mDstAddress = dstAddress;
this.mSrcPort = srcPort;
this.mDstPort = dstPort;
this.mPacket = data;
// Check we have two IP addresses of the same family.
if (srcAddress == null || dstAddress == null || !srcAddress.getClass().getName()
.equals(dstAddress.getClass().getName())) {
Log.e(TAG, "Invalid or mismatched InetAddresses in KeepalivePacketData");
throw new InvalidPacketException(ERROR_INVALID_IP_ADDRESS);
}
// Check the ports.
if (!IpUtils.isValidUdpOrTcpPort(srcPort) || !IpUtils.isValidUdpOrTcpPort(dstPort)) {
Log.e(TAG, "Invalid ports in KeepalivePacketData");
throw new InvalidPacketException(ERROR_INVALID_PORT);
}
}
/** Get source IP address. */
@NonNull
public InetAddress getSrcAddress() {
return mSrcAddress;
}
/** Get destination IP address. */
@NonNull
public InetAddress getDstAddress() {
return mDstAddress;
}
/** Get source port number. */
public int getSrcPort() {
return mSrcPort;
}
/** Get destination port number. */
public int getDstPort() {
return mDstPort;
}
/**
* Returns a byte array of the given packet data.
*/
@NonNull
public byte[] getPacket() {
return mPacket.clone();
}
@Override
public String toString() {
return "KeepalivePacketData[srcAddress=" + mSrcAddress
+ ", dstAddress=" + mDstAddress
+ ", srcPort=" + mSrcPort
+ ", dstPort=" + mDstPort
+ ", packet.length=" + mPacket.length
+ ']';
}
}
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