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/**
*
*/
package io.pkts.packet.impl;
import io.pkts.buffer.Buffer;
import io.pkts.buffer.Buffers;
import io.pkts.framer.IPv4Framer;
import io.pkts.packet.IPPacket;
import io.pkts.packet.MACPacket;
import io.pkts.packet.PCapPacket;
import io.pkts.protocol.Protocol;
import java.io.IOException;
import java.io.OutputStream;
/**
* @author [email protected]
*/
public final class MACPacketImpl extends AbstractPacket implements MACPacket {
private static final IPv4Framer framer = new IPv4Framer();
private final PCapPacket parent;
private final String sourceMacAddress;
private final String destinationMacAddress;
/**
* If the headers are set then this overrides any of the source stuff set
* above.
*/
private final Buffer headers;
/**
* Creates a new {@link MACPacketImpl} and it assumes ethernet II and it
* does not check whether or not the ethertype is a known type. This method
* should only be used by the internal packet creating functions such as the
* {@link TransportPacketFactoryImpl} or the framers.
*
* @param parent
* @param headers
* @return
*/
public static MACPacketImpl create(final PCapPacket parent, final Buffer headers) {
if (headers.capacity() != 14) {
throw new IllegalArgumentException("Not enough bytes to create this header");
}
if (parent == null) {
throw new IllegalArgumentException("The parent packet cannot be null");
}
return new MACPacketImpl(Protocol.ETHERNET_II, parent, headers, null);
}
/**
* Construct a new {@link MACPacket} based on the supplied headers.
*
* @param packet
* @param headers
*/
public MACPacketImpl(final Protocol protocol, final PCapPacket parent, final Buffer headers, final Buffer payload) {
super(protocol, parent, payload);
this.parent = parent;
this.headers = headers;
this.sourceMacAddress = null;
this.destinationMacAddress = null;
}
/**
* {@inheritDoc}
*/
@Override
public final String getSourceMacAddress() {
if (this.sourceMacAddress != null) {
return this.sourceMacAddress;
}
try {
return toHexString(this.headers, 6, 6);
} catch (final IOException e) {
throw new RuntimeException("Unable to read data from the underlying Buffer.", e);
}
}
public static String toHexString(final Buffer buffer, final int start, final int length) throws IOException {
final StringBuilder sb = new StringBuilder();
for (int i = start; i < start + length; ++i) {
final byte b = buffer.getByte(i);
sb.append(String.format("%02X", b));
if (i < start + length - 1) {
sb.append(":");
}
}
return sb.toString();
}
/**
* {@inheritDoc}
*/
@Override
public final String getDestinationMacAddress() {
if (this.destinationMacAddress != null) {
return this.destinationMacAddress;
}
try {
return toHexString(this.headers, 0, 6);
} catch (final IOException e) {
throw new RuntimeException("Unable to read data from the underlying Buffer.", e);
}
}
/**
* {@inheritDoc}
*/
@Override
public void verify() {
// nothing to verify
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
sb.append("Destination Mac Address: ").append(this.destinationMacAddress)
.append(" Source Mac Address: ").append(this.sourceMacAddress);
return sb.toString();
}
@Override
public long getArrivalTime() {
return this.parent.getArrivalTime();
}
@Override
public void write(final OutputStream out, final Buffer payload) throws IOException {
this.parent.write(out, Buffers.wrap(this.headers, payload));
}
/**
* {@inheritDoc}
*/
@Override
public void setSourceMacAddress(final String macAddress) {
setMacAddress(macAddress, true);
}
/**
* {@inheritDoc}
*/
@Override
public void setDestinationMacAddress(final String macAddress) {
setMacAddress(macAddress, false);
}
/**
* Helper method for setting the mac address in the header buffer.
*
* @param macAddress
* the mac address to parse
* @param setSourceMacAddress
* whether this is to bet set as the source mac address or not.
* False implies destination mac address of course.
* @throws IllegalArgumentException
*/
private void setMacAddress(final String macAddress, final boolean setSourceMacAddress)
throws IllegalArgumentException {
if (macAddress == null || macAddress.isEmpty()) {
throw new IllegalArgumentException("Null or empty string cannot be a valid MAC Address.");
}
// very naive implementation first.
final String[] segments = macAddress.split(":");
if (segments.length != 6) {
throw new IllegalArgumentException("Invalid MAC Address. Not enough segments");
}
final int offset = setSourceMacAddress ? 6 : 0;
for (int i = 0; i < 6; ++i) {
final byte b = (byte) ((Character.digit(segments[i].charAt(0), 16) << 4) + Character.digit(segments[i]
.charAt(1), 16));
this.headers.setByte(i + offset, b);
}
}
@Override
public MACPacket clone() {
final PCapPacket pkt = this.parent.clone();
return new MACPacketImpl(getProtocol(), pkt, this.headers.clone(), getPayload().clone());
}
@Override
public long getTotalLength() {
return this.parent.getTotalLength();
}
@Override
public long getCapturedLength() {
return this.parent.getCapturedLength();
}
@Override
public IPPacket getNextPacket() throws IOException {
final Buffer payload = getPayload();
if (payload == null) {
return null;
}
return framer.frame(this, payload);
}
}
