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/*
* Copyright (C) 2015 SDN-WISE
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
package com.github.sdnwiselab.sdnwise.packet;
import com.github.sdnwiselab.sdnwise.util.NodeAddress;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* This class represents a generic SDN-WISE message.
*
* @author Sebastiano Milardo
* @version 0.1
*/
public class NetworkPacket implements Cloneable{
/**
* The maximum number of hops allowed in the network.
*/
public final static byte SDN_WISE_DFLT_TTL_MAX = 20;
/**
* The maximum length of a NetworkPAcket.
*/
public final static byte SDN_WISE_MAX_LEN = 116;
// TODO these values won't be public in the future
public final static byte SDN_WISE_LEN = 0,
SDN_WISE_NET_ID = 1,
SDN_WISE_SRC_H = 2,
SDN_WISE_SRC_L = 3,
SDN_WISE_DST_H = 4,
SDN_WISE_DST_L = 5,
SDN_WISE_TYPE = 6,
SDN_WISE_TTL = 7,
SDN_WISE_NXHOP_H = 8,
SDN_WISE_NXHOP_L = 9,
SDN_WISE_DIST = 10,
SDN_WISE_BATT = 11,
SDN_WISE_NEIGH = 12;
// TODO these values won't be public in the future
// packet types
public final static byte SDN_WISE_DATA = 0,
SDN_WISE_BEACON = 1,
SDN_WISE_REPORT = 2,
SDN_WISE_REQUEST = 3,
SDN_WISE_RESPONSE = 4,
SDN_WISE_OPEN_PATH = 5,
SDN_WISE_CONFIG = 6;
private static final char[] hexArray = "0123456789ABCDEF".toCharArray();
private final byte SDN_WISE_DFLT_HDR_LEN = 10;
private final byte[] data = new byte[SDN_WISE_MAX_LEN];;
/**
* Returns a NetworkPacket given a byte array.
*
* @param data the data contained in the NetworkPacket
*/
public NetworkPacket(byte[] data) {
setArray(data);
}
/**
* Creates an empty NetworkPacket. The TTL and LEN values are set to
* default.
*/
public NetworkPacket() {
this.setTtl(SDN_WISE_DFLT_TTL_MAX);
this.setLen(SDN_WISE_DFLT_HDR_LEN);
}
/**
* Returns a NetworkPacket given a int array. Integer values will be
* truncated to byte.
*
* @param data the data contained in the NetworkPacket
*/
public NetworkPacket(int[] data){
setArray(fromIntArrayToByteArray(data));
}
private byte[] fromIntArrayToByteArray(int[] array){
byte[] dataToByte = new byte[array.length];
for (int i = 0; i < array.length; i++) {
dataToByte[i] = (byte) array[i];
}
return dataToByte;
}
private void setArray(byte[] array) {
if (array.length <= SDN_WISE_MAX_LEN && array.length >=
SDN_WISE_DFLT_HDR_LEN){
this.setLen(array[SDN_WISE_LEN]);
this.setNetId(array[SDN_WISE_NET_ID]);
this.setSrc(array[SDN_WISE_SRC_H],array[SDN_WISE_SRC_L]);
this.setDst(array[SDN_WISE_DST_H],array[SDN_WISE_DST_L]);
this.setType(array[SDN_WISE_TYPE]);
this.setTtl(array[SDN_WISE_TTL]);
this.setNxhop(array[SDN_WISE_NXHOP_H],array[SDN_WISE_NXHOP_L]);
this.setPayload(Arrays.copyOfRange(array, SDN_WISE_DFLT_HDR_LEN,
this.getLen()));
} else {
throw new IllegalArgumentException("Invalid array size: " + array.length);
}
}
/**
* Returns the length of the message.
*
* @return an integer representing the length of the message
*/
public final int getLen() {
return data[0] & 0xFF;
}
/**
* Sets the length of the message.
*
* @param value an integer representing the length of the message.
* @return the packet itself.
*/
public final NetworkPacket setLen(byte value) {
if (value <= SDN_WISE_MAX_LEN && value > 0){
data[0] = value;
} else {
throw new IllegalArgumentException("Invalid length");
}
return this;
}
/**
* Returns the NetworkId of the message.
*
* @return an integer representing the NetworkId of the message
*/
public final int getNetId() {
return data[1] & 0xFF;
}
/**
* Sets the NetworkId of the message.
*
* @param value the networkId of the packet.
* @return the packet itself.
*/
public final NetworkPacket setNetId(byte value) {
data[1] = value;
return this;
}
/**
* Returns the address of the source node.
*
* @return the NodeAddress of the source node
*/
public final NodeAddress getSrc() {
return new NodeAddress(data[2], data[3]);
}
/**
* Sets the address of the source node.
*
* @param valueH the high byte of the address.
* @param valueL the low byte of the address.
* @return the packet itself.
*/
public final NetworkPacket setSrc(byte valueH, byte valueL) {
data[2] = valueH;
data[3] = valueL;
return this;
}
/**
* Sets the address of the source node.
*
* @param address the NodeAddress of the source node.
* @return the packet itself.
*/
public NetworkPacket setSrc(NodeAddress address) {
setSrc(address.getHigh(), address.getLow());
return this;
}
/**
* Sets the address of the source node.
*
* @param address a String representing the address of the source node.
* @return the packet itself.
*/
public final NetworkPacket setSrc(String address) {
setSrc(new NodeAddress(address));
return this;
}
/**
* Returns the address of the destination node.
*
* @return the NodeAddress of the destination node
*/
public final NodeAddress getDst() {
return new NodeAddress(data[4], data[5]);
}
/**
* Set the address of the destination node.
*
* @param valueH high value of the address of the destination.
* @param valueL low value of the address of the destination.
* @return the packet itself.
*/
public final NetworkPacket setDst(byte valueH, byte valueL) {
data[4] = valueH;
data[5] = valueL;
return this;
}
/**
* Set the address of the destination node.
*
* @param address the NodeAddress value of the destination.
* @return the packet itself.
*/
public final NetworkPacket setDst(NodeAddress address) {
setDst(address.getHigh(), address.getLow());
return this;
}
/**
* Set the address of the destination node.
*
* @param address a String representing the destination address.
* @return the packet itself.
*/
public final NetworkPacket setDst(String address) {
setDst(new NodeAddress(address));
return this;
}
/**
* Returns the type of the message.
*
* @return an integer representing the type of the message
*/
public final int getType() {
return data[6] & 0xFF;
}
/**
* Sets the type of the message.
*
* @param type an integer representing the type of the message
* @return
*/
final NetworkPacket setType(byte type) {
data[6] = type;
return this;
}
/**
* Returns the Time To Live of the message. When the TTL of a packet
* reaches 0 the receiving node will drop the packet.
*
* @return an integer representing the Time To Live of the message
*/
public final int getTtl() {
return data[7] & 0xFF;
}
/**
* Sets the Time To Live of the message. When the TTL of a packet
* reaches 0 the receiving node will drop the packet.
*
* @param value an integer representing the Time To Live of the message.
* @return the packet itself.
*/
public final NetworkPacket setTtl(byte value) {
data[7] = value;
return this;
}
/**
* Returns the NodeAddress of the next hop towards the destination.
*
* @return the NodeAddress of the the next hop towards the destination node
*/
public final NodeAddress getNxhop() {
return new NodeAddress(data[8], data[9]);
}
/**
* Sets the NodeAddress of the next hop towards the destination.
*
* @param valueH high value of the address of the next hop.
* @param valueL low value of the address of the next hop.
* @return packet itself.
*/
public final NetworkPacket setNxhop(byte valueH, byte valueL) {
data[8] = valueH;
data[9] = valueL;
return this;
}
/**
* Sets the NodeAddress of the next hop towards the destination.
*
* @param address the NodeAddress address of the next hop.
* @return packet itself.
*/
public final NetworkPacket setNxhop(NodeAddress address) {
setNxhop(address.getHigh(), address.getLow());
return this;
}
/**
* Sets the NodeAddress of the next hop towards the destination.
*
* @param address a string representing the address of the next hop.
* @return packet itself.
*/
public final NetworkPacket setNxhop(String address) {
setNxhop(new NodeAddress(address));
return this;
}
/**
* Returns the payload of the packet as a byte array.
*
* @return the payload of the packet
*/
public byte[] getPayload() {
return Arrays.copyOfRange(data, SDN_WISE_DFLT_HDR_LEN,
this.getLen());
}
/**
* Sets the payload of the packet from a byte array.
*
* @param payload the payload of the packet.
* @return the payload of the packet.
*/
public NetworkPacket setPayload(byte[] payload) {
if (payload.length + SDN_WISE_DFLT_HDR_LEN <= SDN_WISE_MAX_LEN){
System.arraycopy(payload, 0, data, SDN_WISE_DFLT_HDR_LEN, payload.length);
this.setLen((byte) (payload.length + SDN_WISE_DFLT_HDR_LEN));
} else {
throw new IllegalArgumentException("Payload exceeds packet size");
}
return this;
}
/**
* Sets the payload size of the packet.
*
* @param size the payload size.
* @return the packet itself.
*/
public NetworkPacket setPayloadSize(int size) {
if (SDN_WISE_DFLT_HDR_LEN + size <= SDN_WISE_MAX_LEN){
this.setLen((byte)(SDN_WISE_DFLT_HDR_LEN + size));
} else {
throw new IllegalArgumentException("Index cannot be greater than "
+ "the maximum payload size: "+ size);
}
return this;
}
/**
* Gets the payload size of the packet.
*
* @return the packet payload size.
*/
public int getPayloadSize() {
return (this.getLen() - SDN_WISE_DFLT_HDR_LEN);
}
/**
* Sets a single payload byte.
*
* @param index the index of the payload. The first byte of the payload is 0.
* @param newData the new data to be set.
* @return the packet itself.
*/
public NetworkPacket setPayloadAt(byte newData, int index) {
if (SDN_WISE_DFLT_HDR_LEN + index < SDN_WISE_MAX_LEN){
data[SDN_WISE_DFLT_HDR_LEN + index] = newData;
if ((index + SDN_WISE_DFLT_HDR_LEN) >= this.getLen()){
this.setLen((byte)(SDN_WISE_DFLT_HDR_LEN + index + 1));
}
} else {
throw new IllegalArgumentException("Index cannot be greater than "
+ "the maximum payload size");
}
return this;
}
/**
* Sets a part of the payload of the NetworkPacket. Differently from
* copyPayload this method updates also the length of the packet
*
* @param src the new data to be set.
* @param srcPos starting from this byte of src.
* @param payloadPos copying to this byte of payload.
* @param length this many bytes.
* @return the packet itself.
*/
public NetworkPacket setPayload(byte[] src, byte srcPos,
byte payloadPos, byte length) {
this.copyPayload(src, srcPos, payloadPos, length);
this.setPayloadSize(length + payloadPos);
return this;
}
/**
* Copy a part of the payload of the NetworkPacket. Differently from
* copyPayload this method does not update the length of the packet
*
* @param src the new data to be set.
* @param srcPos starting from this byte of src.
* @param payloadPos copying to this byte of payload.
* @param length this many bytes.
* @return the packet itself.
*/
public NetworkPacket copyPayload(byte[] src, byte srcPos,
byte payloadPos, byte length) {
for (int i = 0; i>> 4];
hexChars[j * 3 + 1] = hexArray[v & 0x0F];
hexChars[j * 3 + 2] = ' ';
}
return new String(hexChars).trim();
}
/**
* Returns a String representation of the NetworkPacket.
*
* @return a String representation of the NetworkPacket
*/
@Override
public String toString() {
StringBuilder str = new StringBuilder("[");
str.append(bytesToHex(data,0,this.getLen()));
str.append("]");
return str.toString();
}
/**
* Returns a byte array representation of the NetworkPacket.
*
* @return a byte array representation of the NetworkPacket
*/
public byte[] toByteArray() {
return Arrays.copyOf(data, this.getLen());
}
/**
* Returns an int array representation of the NetworkPacket.
*
* @return a int array representation of the NetworkPacket
*/
public int[] toIntArray() {
int[] tmp = new int[this.getLen()];
for (int i = 0; i 127){
setType((byte) (getType()-128));
}
return this;
}
}
