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The core module of Pcap4J.
/*_##########################################################################
_##
_## Copyright (C) 2012-2016 Pcap4J.org
_##
_##########################################################################
*/
package org.pcap4j.packet;
import static org.pcap4j.util.ByteArrays.*;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import org.pcap4j.packet.factory.PacketFactories;
import org.pcap4j.packet.factory.PacketFactory;
import org.pcap4j.packet.namednumber.IpNumber;
import org.pcap4j.packet.namednumber.IpV6OptionType;
import org.pcap4j.packet.namednumber.NotApplicable;
import org.pcap4j.util.ByteArrays;
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public abstract class IpV6ExtOptionsPacket extends AbstractPacket {
private final Packet payload;
/**
*
*/
private static final long serialVersionUID = 416178196599916582L;
/**
*
*/
protected IpV6ExtOptionsPacket() {
this.payload = null;
}
/**
*
* @param rawData rawData
* @param payloadOffset payloadOffset
* @param payloadLength payloadLength
* @param number number
*/
protected IpV6ExtOptionsPacket(
byte[] rawData, int payloadOffset, int payloadLength, IpNumber number
) {
PacketFactory factory
= PacketFactories.getFactory(Packet.class, IpNumber.class);
Class nextPacketClass = factory.getTargetClass(number);
Packet nextPacket;
if (nextPacketClass.equals(factory.getTargetClass())) {
nextPacket =
PacketFactories.getFactory(Packet.class, NotApplicable.class)
.newInstance(rawData, payloadOffset, payloadLength, NotApplicable.UNKNOWN_IP_V6_EXTENSION);
if (nextPacket instanceof IllegalPacket) {
nextPacket = factory.newInstance(rawData, payloadOffset, payloadLength);
}
}
else {
nextPacket = factory.newInstance(rawData, payloadOffset, payloadLength, number);
}
this.payload = nextPacket;
}
/**
*
* @param builder builder
*/
protected IpV6ExtOptionsPacket(Builder builder) {
if (
builder == null
|| builder.nextHeader == null
|| builder.options == null
) {
StringBuilder sb = new StringBuilder();
sb.append("builder: ").append(builder)
.append(" builder.nextHeader: ").append(builder.nextHeader)
.append(" builder.options: ").append(builder.options);
throw new NullPointerException(sb.toString());
}
// if (builder.options.size() == 0) {
// throw new IllegalArgumentException(
// "No option is invalid to IPv6 Options Header"
// );
// }
this.payload = builder.payloadBuilder != null ? builder.payloadBuilder.build() : null;
}
@Override
public abstract IpV6ExtOptionsHeader getHeader();
@Override
public Packet getPayload() {
return payload;
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public static abstract class Builder extends AbstractBuilder
implements LengthBuilder {
private IpNumber nextHeader;
private byte hdrExtLen;
private List options;
private Packet.Builder payloadBuilder;
private boolean correctLengthAtBuild;
/**
*
*/
public Builder() {}
/**
*
* @param packet packet
*/
protected Builder(IpV6ExtOptionsPacket packet) {
this.nextHeader = packet.getHeader().nextHeader;
this.hdrExtLen = packet.getHeader().hdrExtLen;
this.options = packet.getHeader().options;
this.payloadBuilder = packet.payload != null ? packet.payload.getBuilder() : null;
}
/**
*
* @param nextHeader nextHeader
* @return this Builder object for method chaining.
*/
public Builder nextHeader(IpNumber nextHeader) {
this.nextHeader = nextHeader;
return this;
}
/**
*
* @param hdrExtLen hdrExtLen
* @return this Builder object for method chaining.
*/
public Builder hdrExtLen(byte hdrExtLen) {
this.hdrExtLen = hdrExtLen;
return this;
}
/**
*
* @param options options
* @return this Builder object for method chaining.
*/
public Builder options(List options) {
this.options = options;
return this;
}
@Override
public Builder payloadBuilder(Packet.Builder payloadBuilder) {
this.payloadBuilder = payloadBuilder;
return this;
}
@Override
public Packet.Builder getPayloadBuilder() {
return payloadBuilder;
}
@Override
public Builder correctLengthAtBuild(boolean correctLengthAtBuild) {
this.correctLengthAtBuild = correctLengthAtBuild;
return this;
}
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public static abstract class IpV6ExtOptionsHeader extends AbstractHeader {
/*
* 0 16 31
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Next Header | Hdr Ext Len | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
* | |
* . .
* . Options .
* . .
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
/**
*
*/
private static final long serialVersionUID = 224822728201337667L;
private static final int NEXT_HEADER_OFFSET
= 0;
private static final int NEXT_HEADER_SIZE
= BYTE_SIZE_IN_BYTES;
private static final int HDR_EXT_LEN_OFFSET
= NEXT_HEADER_OFFSET + NEXT_HEADER_SIZE;
private static final int HDR_EXT_LEN_SIZE
= BYTE_SIZE_IN_BYTES;
private static final int OPTIONS_OFFSET
= HDR_EXT_LEN_OFFSET + HDR_EXT_LEN_SIZE;
private final IpNumber nextHeader;
private final byte hdrExtLen;
private final List options;
/**
*
* @param rawData rawData
* @param offset offset
* @param length length
* @throws IllegalRawDataException if parsing the raw data fails.
*/
protected IpV6ExtOptionsHeader(
byte[] rawData, int offset, int length
) throws IllegalRawDataException {
if (length < 2) {
StringBuilder sb = new StringBuilder(110);
sb.append("The data length of ")
.append(getHeaderName())
.append(" is must be more than 1. data: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
this.nextHeader
= IpNumber
.getInstance(ByteArrays.getByte(rawData, NEXT_HEADER_OFFSET + offset));
this.hdrExtLen
= ByteArrays.getByte(rawData, HDR_EXT_LEN_OFFSET + offset);
int headerLength = (getHdrExtLenAsInt() + 1) * 8;
if (length < headerLength) {
StringBuilder sb = new StringBuilder(110);
sb.append("The data is too short to build an ")
.append(getHeaderName())
.append("(")
.append(headerLength)
.append(" bytes). data: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
this.options = new ArrayList();
int currentOffsetInHeader = OPTIONS_OFFSET;
while (currentOffsetInHeader < headerLength) {
IpV6OptionType type
= IpV6OptionType.getInstance(rawData[currentOffsetInHeader + offset]);
IpV6Option newOne;
try {
newOne = PacketFactories
.getFactory(IpV6Option.class, IpV6OptionType.class)
.newInstance(
rawData,
currentOffsetInHeader + offset,
headerLength - currentOffsetInHeader,
type
);
} catch (Exception e) {
break;
}
options.add(newOne);
currentOffsetInHeader += newOne.length();
}
}
/**
*
* @param builder builder
*/
protected IpV6ExtOptionsHeader(Builder builder) {
int optLength = 0;
for (IpV6Option o: builder.options) {
optLength += o.length();
}
if ((optLength + 2) % 8 != 0) {
StringBuilder sb = new StringBuilder(200);
String ls = System.getProperty("line.separator");
sb.append("options length is invalid.")
.append(" ([options length] + 2) % 8 must be 0.")
.append(" options: ")
.append(ls);
for (IpV6Option opt: builder.options) {
sb.append(opt)
.append(ls);
}
throw new IllegalArgumentException(sb.toString());
}
this.nextHeader = builder.nextHeader;
this.options = new ArrayList(builder.options);
if (builder.correctLengthAtBuild) {
this.hdrExtLen = (byte)((optLength + 2) / 8 - 1);
}
else {
this.hdrExtLen = builder.hdrExtLen;
}
}
/**
*
* @return nextHeader
*/
public IpNumber getNextHeader() {
return nextHeader;
}
/**
*
* @return hdrExtLen
*/
public byte getHdrExtLen() {
return hdrExtLen;
}
/**
*
* @return hdrExtLen
*/
public int getHdrExtLenAsInt() {
return 0xFF & hdrExtLen;
}
/**
*
* @return options
*/
public List getOptions() {
return new ArrayList(options);
}
@Override
protected List getRawFields() {
List rawFields = new ArrayList();
rawFields.add(ByteArrays.toByteArray(nextHeader.value()));
rawFields.add(ByteArrays.toByteArray(hdrExtLen));
for (IpV6Option o: options) {
rawFields.add(o.getRawData());
}
return rawFields;
}
@Override
public int calcLength() {
int optLength = 0;
for (IpV6Option o: options) {
optLength += o.length();
}
return optLength + 2;
}
@Override
protected String buildString() {
StringBuilder sb = new StringBuilder();
String ls = System.getProperty("line.separator");
sb.append("[")
.append(getHeaderName())
.append(" (")
.append(length())
.append(" bytes)]")
.append(ls);
sb.append(" Next Header: ")
.append(nextHeader)
.append(ls);
sb.append(" Hdr Ext Len: ")
.append(getHdrExtLenAsInt())
.append(" (")
.append((getHdrExtLenAsInt() + 1) * 8)
.append(" [bytes])")
.append(ls);
sb.append(" Options: ")
.append(ls);
for (IpV6Option opt: options) {
sb.append(" ")
.append(opt)
.append(ls);
}
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (obj == this) { return true; }
if (!this.getClass().isInstance(obj)) { return false; }
IpV6ExtOptionsHeader other = (IpV6ExtOptionsHeader)obj;
return
nextHeader.equals(other.nextHeader)
&& hdrExtLen == other.hdrExtLen
&& options.equals(other.options);
}
@Override
protected int calcHashCode() {
int result = 17;
result = 31 * result + nextHeader.hashCode();
result = 31 * result + hdrExtLen;
result = 31 * result + options.hashCode();
return result;
}
/**
*
* @return header name
*/
abstract protected String getHeaderName();
}
/**
* The interface representing an IPv6 option.
* If you use {@link org.pcap4j.packet.factory.PropertiesBasedPacketFactory PropertiesBasedPacketFactory},
* classes which implement this interface must implement the following method:
* {@code public static IpV6Option newInstance(byte[] rawData, int offset, int length)
* throws IllegalRawDataException}
*
* @author Kaito Yamada
* @since pcap4j 0.9.11
*/
public interface IpV6Option extends Serializable {
/**
*
* @return type
*/
public IpV6OptionType getType();
/**
*
* @return length
*/
public int length();
/**
*
* @return raw data
*/
public byte[] getRawData();
}
}
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