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The core module of Pcap4J.
/*_##########################################################################
_##
_## Copyright (C) 2014-2015 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.namednumber.ArpHardwareType;
import org.pcap4j.packet.namednumber.EtherType;
import org.pcap4j.packet.namednumber.LinuxSllPacketType;
import org.pcap4j.util.ByteArrays;
import org.pcap4j.util.LinkLayerAddress;
/**
* @author Kaito Yamada
* @since pcap4j 1.4.0
*/
public final class LinuxSllPacket extends AbstractPacket {
/** */
private static final long serialVersionUID = -7743587634024281470L;
private final LinuxSllHeader 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 LinuxSllPacket object.
* @throws IllegalRawDataException if parsing the raw data fails.
*/
public static LinuxSllPacket newPacket(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
ByteArrays.validateBounds(rawData, offset, length);
return new LinuxSllPacket(rawData, offset, length);
}
private LinuxSllPacket(byte[] rawData, int offset, int length) throws IllegalRawDataException {
this.header = new LinuxSllHeader(rawData, offset, length);
int payloadLength = length - header.length();
if (payloadLength > 0) {
this.payload =
PacketFactories.getFactory(Packet.class, EtherType.class)
.newInstance(rawData, offset + header.length(), payloadLength, header.getProtocol());
} else {
this.payload = null;
}
}
private LinuxSllPacket(Builder builder) {
if (builder == null
|| builder.packetType == null
|| builder.addressType == null
|| builder.address == null
|| builder.protocol == null) {
StringBuilder sb = new StringBuilder();
sb.append("builder: ")
.append(builder)
.append(" builder.packetType: ")
.append(builder.packetType)
.append(" builder.addressType: ")
.append(builder.addressType)
.append(" builder.address: ")
.append(builder.address)
.append(" builder.protocol: ")
.append(builder.protocol);
throw new NullPointerException(sb.toString());
}
this.payload = builder.payloadBuilder != null ? builder.payloadBuilder.build() : null;
this.header = new LinuxSllHeader(builder);
}
@Override
public LinuxSllHeader getHeader() {
return header;
}
@Override
public Packet getPayload() {
return payload;
}
@Override
public Builder getBuilder() {
return new Builder(this);
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.11
*/
public static final class Builder extends AbstractBuilder {
private LinuxSllPacketType packetType;
private ArpHardwareType addressType;
private short addressLength;
private byte[] address;
private EtherType protocol;
private Packet.Builder payloadBuilder;
/** */
public Builder() {}
private Builder(LinuxSllPacket packet) {
this.packetType = packet.header.packetType;
this.addressType = packet.header.addressType;
this.addressLength = packet.header.addressLength;
this.address = packet.header.addressField;
this.protocol = packet.header.protocol;
this.payloadBuilder = packet.payload != null ? packet.payload.getBuilder() : null;
}
/**
* @param packetType packetType
* @return this Builder object for method chaining.
*/
public Builder packetType(LinuxSllPacketType packetType) {
this.packetType = packetType;
return this;
}
/**
* @param addressType addressType
* @return this Builder object for method chaining.
*/
public Builder addressType(ArpHardwareType addressType) {
this.addressType = addressType;
return this;
}
/**
* @param addressLength addressLength
* @return this Builder object for method chaining.
*/
public Builder addressLength(short addressLength) {
this.addressLength = addressLength;
return this;
}
/**
* @param address address
* @return this Builder object for method chaining.
*/
public Builder address(byte[] address) {
this.address = address;
return this;
}
/**
* @param protocol protocol
* @return this Builder object for method chaining.
*/
public Builder protocol(EtherType protocol) {
this.protocol = protocol;
return this;
}
@Override
public Builder payloadBuilder(Packet.Builder payloadBuilder) {
this.payloadBuilder = payloadBuilder;
return this;
}
@Override
public Packet.Builder getPayloadBuilder() {
return payloadBuilder;
}
@Override
public LinuxSllPacket build() {
return new LinuxSllPacket(this);
}
}
/**
* @author Kaito Yamada
* @since pcap4j 0.9.11
*/
public static final class LinuxSllHeader extends AbstractHeader {
/*
* pcap/sll.h
*
* #define SLL_ADDRLEN 8 // length of address field
*
* struct sll_header {
* u_int16_t sll_pkttype; // packet type
* u_int16_t sll_hatype; // link-layer address type
* u_int16_t sll_halen; // link-layer address length
* u_int8_t sll_addr[SLL_ADDRLEN]; // link-layer address
* u_int16_t sll_protocol; // protocol
* };
*/
/** */
private static final long serialVersionUID = -4946840737268934876L;
private static final int PPKTTYPE_OFFSET = 0;
private static final int PPKTTYPE_SIZE = SHORT_SIZE_IN_BYTES;
private static final int PHATYPE_OFFSET = PPKTTYPE_OFFSET + PPKTTYPE_SIZE;
private static final int PHATYPE_SIZE = SHORT_SIZE_IN_BYTES;
private static final int HALEN_OFFSET = PHATYPE_OFFSET + PHATYPE_SIZE;
private static final int HALEN_SIZE = SHORT_SIZE_IN_BYTES;
private static final int ADDR_OFFSET = HALEN_OFFSET + HALEN_SIZE;
private static final int ADDR_SIZE = 8;
private static final int PROTOCOL_OFFSET = ADDR_OFFSET + ADDR_SIZE;
private static final int PROTOCOL_SIZE = SHORT_SIZE_IN_BYTES;
private static final int LINUX_SLL_HEADER_SIZE = PROTOCOL_OFFSET + PROTOCOL_SIZE;
private final LinuxSllPacketType packetType;
private final ArpHardwareType addressType;
private final short addressLength;
private final byte[] addressField = new byte[ADDR_SIZE];
private final LinkLayerAddress address;
private final EtherType protocol;
private LinuxSllHeader(byte[] rawData, int offset, int length) throws IllegalRawDataException {
if (length < LINUX_SLL_HEADER_SIZE) {
StringBuilder sb = new StringBuilder(200);
sb.append("The data is too short to build a Linux SLL header(")
.append(LINUX_SLL_HEADER_SIZE)
.append(" bytes). data: ")
.append(ByteArrays.toHexString(rawData, " "))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
this.packetType =
LinuxSllPacketType.getInstance(ByteArrays.getShort(rawData, PPKTTYPE_OFFSET + offset));
this.addressType =
ArpHardwareType.getInstance(ByteArrays.getShort(rawData, PHATYPE_OFFSET + offset));
this.addressLength = ByteArrays.getShort(rawData, HALEN_OFFSET + offset);
if (getAddressLengthAsInt() > ADDR_SIZE) {
StringBuilder sb = new StringBuilder(100);
sb.append("addressLength must not be longer than ")
.append(ADDR_SIZE)
.append(" but it is: ")
.append(getAddressLengthAsInt());
throw new IllegalRawDataException(sb.toString());
}
System.arraycopy(rawData, ADDR_OFFSET + offset, addressField, 0, ADDR_SIZE);
if (addressLength == 0) {
this.address = null;
} else {
this.address =
ByteArrays.getLinkLayerAddress(rawData, ADDR_OFFSET + offset, getAddressLengthAsInt());
}
this.protocol = EtherType.getInstance(ByteArrays.getShort(rawData, PROTOCOL_OFFSET + offset));
}
private LinuxSllHeader(Builder builder) {
if (builder.address.length > ADDR_SIZE) {
StringBuilder sb = new StringBuilder(100);
sb.append("address must not be longer than ")
.append(ADDR_SIZE)
.append(" but it is: ")
.append(ByteArrays.toHexString(builder.address, " "));
throw new IllegalArgumentException(sb.toString());
}
if ((builder.addressLength & 0xFFFF) > ADDR_SIZE) {
StringBuilder sb = new StringBuilder(100);
sb.append("addressLength & 0xFFFF must not be longer than ")
.append(ADDR_SIZE)
.append(" but it is: ")
.append(builder.addressLength & 0xFFFF);
throw new IllegalArgumentException(sb.toString());
}
this.packetType = builder.packetType;
this.addressType = builder.addressType;
this.addressLength = builder.addressLength;
System.arraycopy(builder.address, 0, addressField, 0, builder.address.length);
this.protocol = builder.protocol;
if (addressLength == 0) {
this.address = null;
} else {
this.address = ByteArrays.getLinkLayerAddress(addressField, 0, getAddressLengthAsInt());
}
}
/** @return packetType */
public LinuxSllPacketType getPacketType() {
return packetType;
}
/** @return addressType */
public ArpHardwareType getAddressType() {
return addressType;
}
/** @return addressLength */
public short getAddressLength() {
return addressLength;
}
/** @return addressLength */
public int getAddressLengthAsInt() {
return 0xFFFF & addressLength;
}
/** @return address, or null if the addressLength is 0. */
public LinkLayerAddress getAddress() {
return address;
}
/** @return address field */
public byte[] getAddressField() {
return ByteArrays.clone(addressField);
}
/** @return protocol */
public EtherType getProtocol() {
return protocol;
}
@Override
protected List getRawFields() {
List rawFields = new ArrayList();
rawFields.add(ByteArrays.toByteArray(packetType.value()));
rawFields.add(ByteArrays.toByteArray(addressType.value()));
rawFields.add(ByteArrays.toByteArray(addressLength));
rawFields.add(addressField);
rawFields.add(ByteArrays.toByteArray(protocol.value()));
return rawFields;
}
@Override
public int length() {
return LINUX_SLL_HEADER_SIZE;
}
@Override
protected String buildString() {
StringBuilder sb = new StringBuilder();
String ls = System.getProperty("line.separator");
sb.append("[Linux SLL header (").append(length()).append(" bytes)]").append(ls);
sb.append(" Packet Type: ").append(packetType).append(ls);
sb.append(" Address Type: ").append(addressType).append(ls);
sb.append(" Address Length: ").append(getAddressLengthAsInt()).append(ls);
sb.append(" Address: ")
.append(address)
.append(" (")
.append(ByteArrays.toHexString(addressField, " "))
.append(")")
.append(ls);
sb.append(" Protocol: ").append(protocol).append(ls);
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!this.getClass().isInstance(obj)) {
return false;
}
LinuxSllHeader other = (LinuxSllHeader) obj;
return Arrays.equals(addressField, other.addressField)
&& packetType.equals(other.packetType)
&& protocol.equals(other.protocol)
&& addressType.equals(other.addressType)
&& addressLength == other.addressLength;
}
@Override
protected int calcHashCode() {
int result = 17;
result = 31 * result + packetType.hashCode();
result = 31 * result + addressType.hashCode();
result = 31 * result + addressLength;
result = 31 * result + Arrays.hashCode(addressField);
result = 31 * result + protocol.hashCode();
return result;
}
}
}
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