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The core module of Pcap4J.
/*_##########################################################################
_##
_## Copyright (C) 2014 Pcap4J.org
_##
_##########################################################################
*/
package org.pcap4j.packet;
import static org.pcap4j.util.ByteArrays.*;
import java.util.ArrayList;
import java.util.Arrays;
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.NotApplicable;
import org.pcap4j.util.ByteArrays;
/**
* @author Kaito Yamada
* @since pcap4j 1.4.0
*/
public final class IpV6ExtUnknownPacket extends AbstractPacket {
/**
*
*/
private static final long serialVersionUID = -7055290165058067091L;
private final IpV6ExtUnknownHeader header;
private final Packet payload;
/**
* A static factory method.
* This method validates the arguments by {@link ByteArrays#validateBounds(byte[], int, int)},
* which may throw exceptions undocumented here.
*
* @param rawData rawData
* @param offset offset
* @param length length
* @return a new IpV6ExtUnknownPacket object.
* @throws IllegalRawDataException if parsing the raw data fails.
*/
public static IpV6ExtUnknownPacket newPacket(
byte[] rawData, int offset, int length
) throws IllegalRawDataException {
ByteArrays.validateBounds(rawData, offset, length);
return new IpV6ExtUnknownPacket(rawData, offset, length);
}
private IpV6ExtUnknownPacket(
byte[] rawData, int offset, int length
) throws IllegalRawDataException {
this.header = new IpV6ExtUnknownHeader(rawData, offset, length);
int payloadLength = length - header.length();
if (payloadLength > 0) {
PacketFactory factory
= PacketFactories.getFactory(Packet.class, IpNumber.class);
Class nextPacketClass = factory.getTargetClass(header.getNextHeader());
Packet nextPacket;
if (nextPacketClass.equals(factory.getTargetClass())) {
nextPacket
= PacketFactories.getFactory(Packet.class, NotApplicable.class)
.newInstance(
rawData,
offset + header.length(),
payloadLength,
NotApplicable.UNKNOWN_IP_V6_EXTENSION
);
if (nextPacket instanceof IllegalPacket) {
nextPacket = factory.newInstance(rawData, offset + header.length(), payloadLength);
}
}
else {
nextPacket
= PacketFactories.getFactory(Packet.class, IpNumber.class)
.newInstance(
rawData,
offset + header.length(),
payloadLength,
header.getNextHeader()
);
}
this.payload = nextPacket;
}
else {
this.payload = null;
}
}
private IpV6ExtUnknownPacket(Builder builder) {
if (
builder == null
|| builder.nextHeader == null
|| builder.data == null
) {
StringBuilder sb = new StringBuilder();
sb.append("builder: ").append(builder)
.append(" builder.nextHeader: ").append(builder.nextHeader)
.append(" builder.data: ").append(builder.data);
throw new NullPointerException(sb.toString());
}
this.payload = builder.payloadBuilder != null ? builder.payloadBuilder.build() : null;
this.header = new IpV6ExtUnknownHeader(builder);
}
@Override
public IpV6ExtUnknownHeader getHeader() {
return header;
}
@Override
public Packet getPayload() {
return payload;
}
@Override
public Builder getBuilder() {
return new Builder(this);
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public static final
class Builder extends AbstractBuilder
implements LengthBuilder {
private IpNumber nextHeader;
private byte hdrExtLen;
private byte[] data;
private Packet.Builder payloadBuilder;
private boolean correctLengthAtBuild;
/**
*
*/
public Builder() {}
/**
*
* @param packet packet
*/
public Builder(IpV6ExtUnknownPacket packet) {
this.nextHeader = packet.header.nextHeader;
this.hdrExtLen = packet.header.hdrExtLen;
this.data = packet.header.data;
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 data data
* @return this Builder object for method chaining.
*/
public Builder data(byte[] data) {
this.data = data;
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;
}
@Override
public IpV6ExtUnknownPacket build() {
return new IpV6ExtUnknownPacket(this);
}
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public static final class IpV6ExtUnknownHeader extends AbstractHeader {
/*
* 0 16 31
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Next Header | Hdr Ext Len | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
* | |
* . .
* . data .
* . .
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
/**
*
*/
private static final long serialVersionUID = -4314577591889991355L;
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 DATA_OFFSET
= HDR_EXT_LEN_OFFSET + HDR_EXT_LEN_SIZE;
private final IpNumber nextHeader;
private final byte hdrExtLen;
private final byte[] data;
private IpV6ExtUnknownHeader(
byte[] rawData, int offset, int length
) throws IllegalRawDataException {
if (length < 4) {
StringBuilder sb = new StringBuilder(110);
sb.append(
"The data length of this header is must be more than 3. 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 this header(")
.append(headerLength)
.append(" bytes). data: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
this.data = ByteArrays.getSubArray(
rawData,
DATA_OFFSET + offset,
headerLength - DATA_OFFSET
);
}
private IpV6ExtUnknownHeader(Builder builder) {
if (builder.data.length < 6) {
StringBuilder sb = new StringBuilder(100);
sb.append("data length must be more than 5. data: ")
.append(ByteArrays.toHexString(builder.data, " "));
throw new IllegalArgumentException(sb.toString());
}
if (((builder.data.length + 2) % 8) != 0) {
StringBuilder sb = new StringBuilder(100);
sb.append("(builder.data.length + 2) % 8 must be 0. data: ")
.append(builder.data);
throw new IllegalArgumentException(sb.toString());
}
this.nextHeader = builder.nextHeader;
this.data = ByteArrays.clone(builder.data);
if (builder.correctLengthAtBuild) {
this.hdrExtLen = (byte)((data.length + 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 data
*/
public byte[] getData() { return ByteArrays.clone(data); }
@Override
protected List getRawFields() {
List rawFields = new ArrayList();
rawFields.add(ByteArrays.toByteArray(nextHeader.value()));
rawFields.add(ByteArrays.toByteArray(hdrExtLen));
rawFields.add(getData());
return rawFields;
}
@Override
public int calcLength() { return data.length + 2; }
@Override
protected String buildString() {
StringBuilder sb = new StringBuilder();
String ls = System.getProperty("line.separator");
sb.append("[IPv6 Unknown Extension Header (")
.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(" data: ")
.append(ByteArrays.toHexString(data, " "))
.append(ls);
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (obj == this) { return true; }
if (!this.getClass().isInstance(obj)) { return false; }
IpV6ExtUnknownHeader other = (IpV6ExtUnknownHeader)obj;
return
nextHeader.equals(other.nextHeader)
&& hdrExtLen == other.hdrExtLen
&& Arrays.equals(data, other.data);
}
@Override
protected int calcHashCode() {
int result = 17;
result = 31 * result + nextHeader.hashCode();
result = 31 * result + hdrExtLen;
result = 31 * result + Arrays.hashCode(data);
return result;
}
}
}
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