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The core module of Pcap4J.
/*_##########################################################################
_##
_## Copyright (C) 2012-2019 Pcap4J.org
_##
_##########################################################################
*/
package org.pcap4j.packet;
import static org.pcap4j.util.ByteArrays.BYTE_SIZE_IN_BYTES;
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.IpV6RoutingType;
import org.pcap4j.packet.namednumber.NotApplicable;
import org.pcap4j.util.ByteArrays;
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public final class IpV6ExtRoutingPacket extends AbstractPacket {
/** */
private static final long serialVersionUID = -4408422883412551431L;
private final IpV6ExtRoutingHeader 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 IpV6ExtRoutingPacket object.
* @throws IllegalRawDataException if parsing the raw data fails.
*/
public static IpV6ExtRoutingPacket newPacket(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
ByteArrays.validateBounds(rawData, offset, length);
return new IpV6ExtRoutingPacket(rawData, offset, length);
}
private IpV6ExtRoutingPacket(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
this.header = new IpV6ExtRoutingHeader(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 =
factory.newInstance(
rawData, offset + header.length(), payloadLength, header.getNextHeader());
}
this.payload = nextPacket;
} else {
this.payload = null;
}
}
private IpV6ExtRoutingPacket(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 IpV6ExtRoutingHeader(builder);
}
@Override
public IpV6ExtRoutingHeader 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 IpV6RoutingType routingType;
private byte segmentsLeft;
private IpV6RoutingData data;
private Packet.Builder payloadBuilder;
private boolean correctLengthAtBuild;
/** */
public Builder() {}
/** @param packet packet */
public Builder(IpV6ExtRoutingPacket packet) {
this.nextHeader = packet.header.nextHeader;
this.hdrExtLen = packet.header.hdrExtLen;
this.routingType = packet.header.routingType;
this.segmentsLeft = packet.header.segmentsLeft;
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 routingType routingType
* @return this Builder object for method chaining.
*/
public Builder routingType(IpV6RoutingType routingType) {
this.routingType = routingType;
return this;
}
/**
* @param segmentsLeft segmentsLeft
* @return this Builder object for method chaining.
*/
public Builder segmentsLeft(byte segmentsLeft) {
this.segmentsLeft = segmentsLeft;
return this;
}
/**
* @param data data
* @return this Builder object for method chaining.
*/
public Builder data(IpV6RoutingData 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 IpV6ExtRoutingPacket build() {
return new IpV6ExtRoutingPacket(this);
}
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.10
*/
public static final class IpV6ExtRoutingHeader extends AbstractHeader {
/*
* 0 16 31
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Next Header | Hdr Ext Len | Routing Type | Segments Left |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* . .
* . type-specific data .
* . .
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
/** */
private static final long serialVersionUID = -72622140516174483L;
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 ROUTING_TYPE_OFFSET = HDR_EXT_LEN_OFFSET + HDR_EXT_LEN_SIZE;
private static final int ROUTING_TYPE_SIZE = BYTE_SIZE_IN_BYTES;
private static final int SEGMENTS_LEFT_OFFSET = ROUTING_TYPE_OFFSET + ROUTING_TYPE_SIZE;
private static final int SEGMENTS_LEFT_SIZE = BYTE_SIZE_IN_BYTES;
private static final int TYPE_SPECIFIC_DATA_OFFSET = SEGMENTS_LEFT_OFFSET + SEGMENTS_LEFT_SIZE;
private final IpNumber nextHeader;
private final byte hdrExtLen;
private final IpV6RoutingType routingType;
private final byte segmentsLeft;
private final IpV6RoutingData data;
private IpV6ExtRoutingHeader(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
if (length < 4) {
StringBuilder sb = new StringBuilder(110);
sb.append("The data length of IPv6 routing 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 an IPv6 routing header(")
.append(headerLength)
.append(" bytes). data: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
this.routingType =
IpV6RoutingType.getInstance(ByteArrays.getByte(rawData, ROUTING_TYPE_OFFSET + offset));
this.segmentsLeft = ByteArrays.getByte(rawData, SEGMENTS_LEFT_OFFSET + offset);
this.data =
PacketFactories.getFactory(IpV6RoutingData.class, IpV6RoutingType.class)
.newInstance(
rawData, TYPE_SPECIFIC_DATA_OFFSET + offset, headerLength - 4, routingType);
}
private IpV6ExtRoutingHeader(Builder builder) {
if (builder.data.length() < 4) {
StringBuilder sb = new StringBuilder(100);
sb.append("data length must be more than 3. data: ").append(builder.data);
throw new IllegalArgumentException(sb.toString());
}
if (((builder.data.length() + 4) % 8) != 0) {
StringBuilder sb = new StringBuilder(100);
sb.append("(builder.data.length() + 8 ) % 8 must be 0. data: ").append(builder.data);
throw new IllegalArgumentException(sb.toString());
}
this.nextHeader = builder.nextHeader;
this.routingType = builder.routingType;
this.segmentsLeft = builder.segmentsLeft;
this.data = builder.data;
if (builder.correctLengthAtBuild) {
this.hdrExtLen = (byte) ((data.length() + 4) / 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 routingType */
public IpV6RoutingType getRoutingType() {
return routingType;
}
/** @return segmentsLeft */
public byte getSegmentsLeft() {
return segmentsLeft;
}
/** @return segmentsLeft */
public int getSegmentsLeftAsInt() {
return segmentsLeft & 0xFF;
}
/** @return data */
public IpV6RoutingData getData() {
return data;
}
@Override
protected List getRawFields() {
List rawFields = new ArrayList();
rawFields.add(ByteArrays.toByteArray(nextHeader.value()));
rawFields.add(ByteArrays.toByteArray(hdrExtLen));
rawFields.add(ByteArrays.toByteArray(routingType.value()));
rawFields.add(ByteArrays.toByteArray(segmentsLeft));
rawFields.add(data.getRawData());
return rawFields;
}
@Override
public int calcLength() {
return data.length() + 4;
}
@Override
protected String buildString() {
StringBuilder sb = new StringBuilder();
String ls = System.getProperty("line.separator");
sb.append("[IPv6 Routing 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(" Routing Type: ").append(routingType).append(ls);
sb.append(" Segments Left: ").append(getSegmentsLeftAsInt()).append(ls);
sb.append(" type-specific data: ").append(data).append(ls);
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!this.getClass().isInstance(obj)) {
return false;
}
IpV6ExtRoutingHeader other = (IpV6ExtRoutingHeader) obj;
return nextHeader.equals(other.nextHeader)
&& data.equals(other.data)
&& routingType.equals(other.routingType)
&& segmentsLeft == other.segmentsLeft
&& hdrExtLen == other.hdrExtLen;
}
@Override
protected int calcHashCode() {
int result = 17;
result = 31 * result + nextHeader.hashCode();
result = 31 * result + hdrExtLen;
result = 31 * result + routingType.hashCode();
result = 31 * result + segmentsLeft;
result = 31 * result + data.hashCode();
return result;
}
}
/**
* The interface representing an IPv6 routing data. If you use {@link
* org.pcap4j.packet.factory.propertiesbased.PropertiesBasedPacketFactory
* PropertiesBasedPacketFactory}, classes which implement this interface must implement the
* following method: {@code public static IpV6RoutingData newInstance(byte[] rawData, int offset,
* int length) throws IllegalRawDataException}
*
* @author Kaito Yamada
* @since pcap4j 0.9.11
*/
public interface IpV6RoutingData extends Serializable {
/** @return length */
public int length();
/** @return raw data */
public byte[] getRawData();
}
}
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