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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.List;
import org.pcap4j.packet.namednumber.Ssh2DisconnectionReasonCode;
import org.pcap4j.packet.namednumber.Ssh2MessageNumber;
import org.pcap4j.util.ByteArrays;
/**
* @author Kaito Yamada
* @since pcap4j 1.0.1
*/
public final class Ssh2DisconnectPacket extends AbstractPacket {
/** */
private static final long serialVersionUID = -1484749154591150073L;
private final Ssh2DisconnectHeader header;
/**
* 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 Ssh2DisconnectPacket object.
* @throws IllegalRawDataException if parsing the raw data fails.
*/
public static Ssh2DisconnectPacket newPacket(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
ByteArrays.validateBounds(rawData, offset, length);
return new Ssh2DisconnectPacket(rawData, offset, length);
}
private Ssh2DisconnectPacket(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
this.header = new Ssh2DisconnectHeader(rawData, offset, length);
}
private Ssh2DisconnectPacket(Builder builder) {
if (builder == null
|| builder.reasonCode == null
|| builder.description == null
|| builder.languageTag == null) {
StringBuilder sb = new StringBuilder();
sb.append("builder: ")
.append(builder)
.append(" builder.reasonCode: ")
.append(builder.reasonCode)
.append(" builder.description: ")
.append(builder.description)
.append(" builder.languageTag: ")
.append(builder.languageTag);
throw new NullPointerException(sb.toString());
}
this.header = new Ssh2DisconnectHeader(builder);
}
@Override
public Ssh2DisconnectHeader getHeader() {
return header;
}
@Override
public Builder getBuilder() {
return new Builder(this);
}
/**
* @author Kaito Yamada
* @since pcap4j 1.0.1
*/
public static final class Builder extends AbstractBuilder {
private Ssh2DisconnectionReasonCode reasonCode;
private Ssh2String description;
private Ssh2String languageTag;
/** */
public Builder() {}
private Builder(Ssh2DisconnectPacket packet) {
this.reasonCode = packet.header.reasonCode;
this.description = packet.header.description;
this.languageTag = packet.header.languageTag;
}
/**
* @param reasonCode reasonCode
* @return this Builder object for method chaining.
*/
public Builder reasonCode(Ssh2DisconnectionReasonCode reasonCode) {
this.reasonCode = reasonCode;
return this;
}
/**
* @param description description
* @return this Builder object for method chaining.
*/
public Builder description(Ssh2String description) {
this.description = description;
return this;
}
/**
* @param languageTag languageTag
* @return this Builder object for method chaining.
*/
public Builder languageTag(Ssh2String languageTag) {
this.languageTag = languageTag;
return this;
}
@Override
public Ssh2DisconnectPacket build() {
return new Ssh2DisconnectPacket(this);
}
}
/**
* @author Kaito Yamada
* @version pcap4j 1.0.1
*/
public static final class Ssh2DisconnectHeader extends AbstractHeader {
/*
* http://tools.ietf.org/html/rfc4253
*
* byte SSH_MSG_DISCONNECT
* uint32 reason code
* string description in ISO-10646 UTF-8 encoding [RFC3629]
* string language tag [RFC3066]
*/
/** */
private static final long serialVersionUID = 873479096967096846L;
private final Ssh2MessageNumber messageNumber = Ssh2MessageNumber.SSH_MSG_DISCONNECT;
private final Ssh2DisconnectionReasonCode reasonCode;
private final Ssh2String description;
private final Ssh2String languageTag;
private Ssh2DisconnectHeader(byte[] rawData, int offset, int length)
throws IllegalRawDataException {
if (length < 13) {
StringBuilder sb = new StringBuilder(80);
sb.append("The data is too short to build an SSH2 Disconnect header. data: ")
.append(new String(rawData))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
if (!Ssh2MessageNumber.getInstance(rawData[offset])
.equals(Ssh2MessageNumber.SSH_MSG_DISCONNECT)) {
StringBuilder sb = new StringBuilder(120);
sb.append("The data is not an SSH2 Disconnect message. data: ")
.append(new String(rawData))
.append(", offset: ")
.append(offset)
.append(", length: ")
.append(length);
throw new IllegalRawDataException(sb.toString());
}
int currentOffset = 1 + offset;
int remainingLength = length - 1;
this.reasonCode =
Ssh2DisconnectionReasonCode.getInstance(ByteArrays.getInt(rawData, currentOffset));
currentOffset += INT_SIZE_IN_BYTES;
remainingLength -= INT_SIZE_IN_BYTES;
this.description = new Ssh2String(rawData, currentOffset, remainingLength);
currentOffset += description.length();
remainingLength -= description.length();
this.languageTag = new Ssh2String(rawData, currentOffset, remainingLength);
}
private Ssh2DisconnectHeader(Builder builder) {
this.reasonCode = builder.reasonCode;
this.description = builder.description;
this.languageTag = builder.languageTag;
}
/** @return messageNumber */
public Ssh2MessageNumber getMessageNumber() {
return messageNumber;
}
/** @return reasonCode */
public Ssh2DisconnectionReasonCode getReasonCode() {
return reasonCode;
}
/** @return description */
public Ssh2String getDescription() {
return description;
}
/** @return languageTag */
public Ssh2String getLanguageTag() {
return languageTag;
}
@Override
protected List getRawFields() {
List rawFields = new ArrayList();
rawFields.add(new byte[] {messageNumber.value()});
rawFields.add(ByteArrays.toByteArray(reasonCode.value()));
rawFields.add(description.getRawData());
rawFields.add(languageTag.getRawData());
return rawFields;
}
@Override
protected int calcLength() {
return getRawData().length;
}
@Override
protected String buildString() {
StringBuilder sb = new StringBuilder();
String ls = System.getProperty("line.separator");
sb.append("[SSH2 Disconnect Header (").append(length()).append(" bytes)]").append(ls);
sb.append(" Message Number: ").append(messageNumber).append(ls);
sb.append(" reason code: ").append(reasonCode).append(ls);
sb.append(" description: ").append(description).append(ls);
sb.append(" language tag: ").append(languageTag).append(ls);
return sb.toString();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!this.getClass().isInstance(obj)) {
return false;
}
Ssh2DisconnectHeader other = (Ssh2DisconnectHeader) obj;
return reasonCode.equals(other.reasonCode)
&& description.equals(other.description)
&& languageTag.equals(other.languageTag);
}
@Override
protected int calcHashCode() {
int result = 17;
result = 31 * result + reasonCode.hashCode();
result = 31 * result + description.hashCode();
result = 31 * result + languageTag.hashCode();
return result;
}
}
}
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