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The core module of Pcap4J.
/*_##########################################################################
_##
_## Copyright (C) 2012-2014 Pcap4J.org
_##
_##########################################################################
*/
package org.pcap4j.packet;
import static org.pcap4j.util.ByteArrays.*;
import java.util.ArrayList;
import java.util.List;
import org.pcap4j.packet.factory.PacketFactories;
import org.pcap4j.packet.namednumber.IpNumber;
import org.pcap4j.packet.namednumber.NotApplicable;
import org.pcap4j.util.ByteArrays;
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public final class IpV6ExtFragmentPacket extends AbstractPacket {
/**
*
*/
private static final long serialVersionUID = 8789423734186381406L;
private final IpV6ExtFragmentHeader 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 IpV6ExtFragmentPacket object.
* @throws IllegalRawDataException if parsing the raw data fails.
*/
public static IpV6ExtFragmentPacket newPacket(
byte[] rawData, int offset, int length
) throws IllegalRawDataException {
ByteArrays.validateBounds(rawData, offset, length);
return new IpV6ExtFragmentPacket(rawData, offset, length);
}
private IpV6ExtFragmentPacket(
byte[] rawData, int offset, int length
) throws IllegalRawDataException {
this.header = new IpV6ExtFragmentHeader(rawData, offset, length);
int payloadLength = length - header.length();
if (payloadLength > 0) {
this.payload
= PacketFactories.getFactory(Packet.class, NotApplicable.class)
.newInstance(rawData, offset + header.length(), payloadLength, NotApplicable.FRAGMENTED);
}
else {
this.payload = null;
}
}
private IpV6ExtFragmentPacket(Builder builder) {
if (
builder == null
|| builder.nextHeader == null
) {
StringBuilder sb = new StringBuilder();
sb.append("builder: ").append(builder)
.append(" builder.nextHeader: ").append(builder.nextHeader);
throw new NullPointerException(sb.toString());
}
this.payload = builder.payloadBuilder != null ? builder.payloadBuilder.build() : null;
this.header = new IpV6ExtFragmentHeader(builder);
}
@Override
public IpV6ExtFragmentHeader 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 {
private IpNumber nextHeader;
private byte reserved;
private short fragmentOffset;
private byte res;
private boolean m;
private int identification;
private Packet.Builder payloadBuilder;
/**
*
*/
public Builder() {}
/**
*
* @param packet packet
*/
public Builder(IpV6ExtFragmentPacket packet) {
this.nextHeader = packet.header.nextHeader;
this.reserved = packet.header.reserved;
this.fragmentOffset = packet.header.fragmentOffset;
this.res = packet.header.res;
this.m = packet.header.m;
this.identification = packet.header.identification;
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 reserved reserved
* @return this Builder object for method chaining.
*/
public Builder reserved(byte reserved) {
this.reserved = reserved;
return this;
}
/**
*
* @param fragmentOffset fragmentOffset
* @return this Builder object for method chaining.
*/
public Builder fragmentOffset(short fragmentOffset) {
this.fragmentOffset = fragmentOffset;
return this;
}
/**
*
* @param res res
* @return this Builder object for method chaining.
*/
public Builder res(byte res) {
this.res = res;
return this;
}
/**
*
* @param m m
* @return this Builder object for method chaining.
*/
public Builder m(boolean m) {
this.m = m;
return this;
}
/**
*
* @param identification identification
* @return this Builder object for method chaining.
*/
public Builder identification(int identification) {
this.identification = identification;
return this;
}
@Override
public Builder payloadBuilder(Packet.Builder payloadBuilder) {
this.payloadBuilder = payloadBuilder;
return this;
}
@Override
public Packet.Builder getPayloadBuilder() {
return payloadBuilder;
}
@Override
public IpV6ExtFragmentPacket build() {
return new IpV6ExtFragmentPacket(this);
}
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public static final class IpV6ExtFragmentHeader extends AbstractHeader {
/*
* 0 16 31
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Next Header | Reserved | Fragment Offset |Res|M|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Identification |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/**
*
*/
private static final long serialVersionUID = 3488980383672562461L;
private static final int NEXT_HEADER_OFFSET
= 0;
private static final int NEXT_HEADER_SIZE
= BYTE_SIZE_IN_BYTES;
private static final int RESERVED_OFFSET
= NEXT_HEADER_OFFSET + NEXT_HEADER_SIZE;
private static final int RESERVED_SIZE
= BYTE_SIZE_IN_BYTES;
private static final int FRAGMENT_OFFSET_AND_RES_AND_M_OFFSET
= RESERVED_OFFSET + RESERVED_SIZE;
private static final int FFRAGMENT_OFFSET_AND_RES_AND_M_SIZE
= SHORT_SIZE_IN_BYTES;
private static final int IDENTIFICATION_OFFSET
= FRAGMENT_OFFSET_AND_RES_AND_M_OFFSET
+ FFRAGMENT_OFFSET_AND_RES_AND_M_SIZE;
private static final int IDENTIFICATION_SIZE
= INT_SIZE_IN_BYTES;
private static final int IPV6_EXT_FRAGMENT_HEADER_SIZE
= IDENTIFICATION_OFFSET + IDENTIFICATION_SIZE;
private final IpNumber nextHeader;
private final byte reserved;
private final short fragmentOffset;
private final byte res;
private final boolean m;
private final int identification;
private IpV6ExtFragmentHeader(
byte[] rawData, int offset, int length
) throws IllegalRawDataException {
if (length < IPV6_EXT_FRAGMENT_HEADER_SIZE) {
StringBuilder sb = new StringBuilder(110);
sb.append("The data is too short to build an IPv6 fragment header(")
.append(IPV6_EXT_FRAGMENT_HEADER_SIZE)
.append(" bytes). 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.reserved
= ByteArrays.getByte(rawData, RESERVED_OFFSET + offset);
short fragmentOffsetAndResAndM
= ByteArrays.getShort(rawData, FRAGMENT_OFFSET_AND_RES_AND_M_OFFSET + offset);
this.fragmentOffset
= (short)((fragmentOffsetAndResAndM & 0xFFF8) >> 3);
this.res
= (byte)((fragmentOffsetAndResAndM & 0x0006) >> 1);
this.m
= (fragmentOffsetAndResAndM & 0x0001) == 1;
this.identification
= ByteArrays.getInt(rawData, IDENTIFICATION_OFFSET + offset);
}
private IpV6ExtFragmentHeader(Builder builder) {
if ((builder.fragmentOffset & 0xE000) != 0) {
throw new IllegalArgumentException(
"Invalid fragmentOffset: " + builder.fragmentOffset
);
}
if ((builder.res & 0xFFFC) != 0) {
throw new IllegalArgumentException(
"Invalid res: " + builder.res
);
}
this.nextHeader = builder.nextHeader;
this.reserved = builder.reserved;
this.fragmentOffset = builder.fragmentOffset;
this.res = builder.res;
this.m = builder.m;
this.identification = builder.identification;
}
/**
*
* @return nextHeader
*/
public IpNumber getNextHeader() {
return nextHeader;
}
/**
*
* @return reserved
*/
public byte getReserved() {
return reserved;
}
/**
*
* @return fragmentOffset
*/
public short getFragmentOffset() {
return fragmentOffset;
}
/**
*
* @return res
*/
public byte getRes() {
return res;
}
/**
*
* @return m
*/
public boolean getM() {
return m;
}
/**
*
* @return identification
*/
public int getIdentification() {
return identification;
}
@Override
protected List getRawFields() {
List rawFields = new ArrayList();
rawFields.add(ByteArrays.toByteArray(nextHeader.value()));
rawFields.add(ByteArrays.toByteArray(reserved));
rawFields.add(
ByteArrays.toByteArray(
(short)((fragmentOffset << 3) | (res << 1) | (m ? 1 : 0))
)
);
rawFields.add(ByteArrays.toByteArray(identification));
return rawFields;
}
@Override
public int length() {
return IPV6_EXT_FRAGMENT_HEADER_SIZE;
}
@Override
protected String buildString() {
StringBuilder sb = new StringBuilder();
String ls = System.getProperty("line.separator");
sb.append("[IPv6 Fragment Header (")
.append(length())
.append(" bytes)]")
.append(ls);
sb.append(" Next Header: ")
.append(nextHeader)
.append(ls);
sb.append(" Reserved: ")
.append(ByteArrays.toHexString(reserved, " "))
.append(ls);
sb.append(" Fragment Offset: ")
.append(fragmentOffset)
.append(ls);
sb.append(" Res: ")
.append(ByteArrays.toHexString(res, " "))
.append(ls);
sb.append(" M: ")
.append(m)
.append(ls);
sb.append(" Identification: ")
.append(identification)
.append(ls);
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (obj == this) { return true; }
if (!this.getClass().isInstance(obj)) { return false; }
IpV6ExtFragmentHeader other = (IpV6ExtFragmentHeader)obj;
return
fragmentOffset == other.fragmentOffset
&& identification == other.identification
&& nextHeader.equals(other.nextHeader)
&& m == other.m
&& reserved == other.reserved
&& res == other.res;
}
@Override
protected int calcHashCode() {
int result = 17;
result = 31 * result + nextHeader.hashCode();
result = 31 * result + reserved;
result = 31 * result + fragmentOffset;
result = 31 * result + res;
result = 31 * result + (m ? 1231 : 1237);
result = 31 * result + identification;
return result;
}
}
}
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