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• 0.0.16
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• NetworkPacket.java

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com.github.sdnwiselab.sdnwise.packet.NetworkPacket Maven / Gradle / Ivy

/* 
 * 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{

     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;

// 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;
    
    
    final byte[] data;

    /**
     * Returns a NetworkPacket given a byte array.
     *
     * @param data the data contained in the NetworkPacket
     */
    public NetworkPacket(byte[] data) {
        this.data = data;
    }

    public NetworkPacket() {
        data = new byte[116];
        this.setLen((byte) data.length);
    }

    public NetworkPacket(int[] data) {
        this.data = new byte[data.length];
        for (int i = 0; i < data.length; i++) {
            this.data[i] = (byte) data[i];
        }
    }

    /**
     * Returns the length of the message.
     *
     * @return an integer representing the length of the message
     */
    public final int getLen() {
        return data[0] & 0xFF;
    }

    public final NetworkPacket setLen(byte value) {
        data[0] = value;
        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;
    }

    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]);
    }

    public final NetworkPacket setSrc(byte valueH, byte valueL) {
        data[2] = valueH;
        data[3] = valueL;
        return this;
    }

    public NetworkPacket setSrc(NodeAddress node) {
        setSrc(node.getHigh(), node.getLow());
        return this;
    }

    public final NetworkPacket setSrc(String node) {
        setSrc(new NodeAddress(node));
        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]);
    }

    public final NetworkPacket setDst(byte valueH, byte valueL) {
        data[4] = valueH;
        data[5] = valueL;
        return this;
    }

    public final NetworkPacket setDst(NodeAddress node) {
        setDst(node.getHigh(), node.getLow());
        return this;
    }

    public final NetworkPacket setDst(String node) {
        setDst(new NodeAddress(node));
        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.
     *
     * @return an integer representing the Time To Live of the message
     */
    public final int getTtl() {
        return data[7] & 0xFF;
    }

    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]);
    }

    public final NetworkPacket setNxhop(byte valueH, byte valueL) {
        data[8] = valueH;
        data[9] = valueL;
        return this;
    }

    public final NetworkPacket setNxhop(NodeAddress node) {
        setNxhop(node.getHigh(), node.getLow());
        return this;
    }

    public final NetworkPacket setNxhop(String node) {
        setNxhop(new NodeAddress(node));
        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, 10, this.getLen());
    }

    public NetworkPacket setPayload(byte[] payload) {
                System.arraycopy(payload, 0, data, 10, payload.length);
                this.setLen((byte) (payload.length + 10));
                return this;
    }

    /**
     * Returns a String representation of the NetworkPacket.
     *
     * @return a String representation of the NetworkPacket
     */
    @Override
    public String toString() {
        StringBuilder str = new StringBuilder("[");
        for (int i = 0; i < this.getLen(); i++) {
            str.append(String.format("%3d", data[i] & 0xFF)).append(",");
        }
        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());
    }

    @Override
    public NetworkPacket clone() {
        try {
            super.clone();
        } catch (CloneNotSupportedException ex) {
            Logger.getLogger(NetworkPacket.class.getName()).log(Level.SEVERE, null, ex);
        }
        return new NetworkPacket(data.clone());
    }
    
    public NetworkPacket setRequestFlag(){
        if (getType() < 128){
            setType((byte) (getType()+128));
        }
        return this;
    }
    
    public NetworkPacket unsetRequestFlag(){
        if (getType() > 127){
            setType((byte) (getType()-128));
        }
        return this;
    }
}