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/*_##########################################################################
  _##
  _##  Copyright (C) 2016  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.GtpV1ExtensionHeaderType;
import org.pcap4j.packet.namednumber.GtpV1MessageType;
import org.pcap4j.packet.namednumber.NotApplicable;
import org.pcap4j.util.ByteArrays;

/**
 * GTPv1 Packet.
 *
 * @see ETSI
 *     TS 129 060 V12.6.0
 * @author Waveform
 * @author Kaito Yamada
 * @since pcap4j 1.6.6
 */
public final class GtpV1Packet extends AbstractPacket {

  /** */
  private static final long serialVersionUID = 4638029542367352625L;

  private final GtpV1Header 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 GtpV1Packet object.
   * @throws IllegalRawDataException if parsing the raw data fails.
   */
  public static GtpV1Packet newPacket(byte[] rawData, int offset, int length)
      throws IllegalRawDataException {
    ByteArrays.validateBounds(rawData, offset, length);
    return new GtpV1Packet(rawData, offset, length);
  }

  private GtpV1Packet(byte[] rawData, int offset, int length) throws IllegalRawDataException {
    this.header = new GtpV1Header(rawData, offset, length);

    int payloadLength = header.getLengthAsInt();
    if (header.isExtensionHeaderFieldPresent()
        || header.isSequenceNumberFieldPresent()
        || header.isNPduNumberFieldPresent()) {
      payloadLength -= 4;
    }

    if (payloadLength < 0) {
      throw new IllegalRawDataException(
          "The value of length field seems to be wrong: " + header.getLengthAsInt());
    }

    if (payloadLength != 0) {
      GtpV1ExtensionHeaderType type = header.getNextExtensionHeaderType();
      if (type != null) {
        this.payload =
            PacketFactories.getFactory(Packet.class, GtpV1ExtensionHeaderType.class)
                .newInstance(rawData, offset + header.length(), payloadLength, type);
      } else {
        this.payload =
            PacketFactories.getFactory(Packet.class, NotApplicable.class)
                .newInstance(
                    rawData, offset + header.length(), payloadLength, NotApplicable.UNKNOWN);
      }
    } else {
      this.payload = null;
    }
  }

  private GtpV1Packet(Builder builder) {
    if (builder == null
        || builder.version == null
        || builder.protocolType == null
        || builder.messageType == null) {
      StringBuilder sb = new StringBuilder();
      sb.append("builder: ")
          .append(builder)
          .append(", builder.version: ")
          .append(builder.version)
          .append(", builder.protocolType: ")
          .append(builder.protocolType)
          .append(", builder.messageType: ")
          .append(builder.messageType);
      throw new NullPointerException(sb.toString());
    }

    this.payload = builder.payloadBuilder != null ? builder.payloadBuilder.build() : null;
    this.header = new GtpV1Header(builder, payload != null ? payload.length() : 0);
  }

  @Override
  public GtpV1Header getHeader() {
    return header;
  }

  @Override
  public Packet getPayload() {
    return payload;
  }

  @Override
  public Builder getBuilder() {
    return new Builder(this);
  }

  /**
   * @author Waveform
   * @author Kaito Yamada
   * @since pcap4j 1.6.6
   */
  public static final class Builder extends AbstractBuilder implements LengthBuilder {

    private GtpVersion version;
    private ProtocolType protocolType;
    private boolean reserved;
    private boolean sequenceNumberFlag;
    private boolean extensionHeaderFlag;
    private boolean nPduNumberFlag;
    private GtpV1MessageType messageType;
    private short length;
    private int teid;
    private Short sequenceNumber;
    private Byte nPduNumber;
    private GtpV1ExtensionHeaderType nextExtensionHeaderType;
    private boolean correctLengthAtBuild;
    private Packet.Builder payloadBuilder;

    /** */
    public Builder() {}

    /** @param packet packet */
    public Builder(GtpV1Packet packet) {
      this.protocolType = packet.header.protocolType;
      this.version = packet.header.version;
      this.reserved = packet.header.reserved;
      this.length = packet.header.length;
      this.messageType = packet.header.messageType;
      this.nPduNumberFlag = packet.header.nPduNumberFlag;
      this.sequenceNumber = packet.header.sequenceNumber;
      this.nPduNumber = packet.header.nPduNumber;
      this.nextExtensionHeaderType = packet.header.nextExtensionHeaderType;
      this.sequenceNumberFlag = packet.header.sequenceNumberFlag;
      this.teid = packet.header.teid;
      this.extensionHeaderFlag = packet.header.extensionHeaderFlag;
      this.payloadBuilder = packet.payload != null ? packet.payload.getBuilder() : null;
    }

    /**
     * @param protocolType protocolType
     * @return this Builder object for method chaining.
     */
    public Builder protocolType(ProtocolType protocolType) {
      this.protocolType = protocolType;
      return this;
    }

    /**
     * @param reserved reserved
     * @return this Builder object for method chaining.
     */
    public Builder reserved(boolean reserved) {
      this.reserved = reserved;
      return this;
    }

    /**
     * @param length length
     * @return this Builder object for method chaining.
     */
    public Builder length(short length) {
      this.length = length;
      return this;
    }

    /**
     * @param extensionHeaderFlag extensionHeaderFlag
     * @return this Builder object for method chaining.
     */
    public Builder extensionHeaderFlag(boolean extensionHeaderFlag) {
      this.extensionHeaderFlag = extensionHeaderFlag;
      return this;
    }

    /**
     * @param sequenceNumberFlag sequenceNumberFlag
     * @return this Builder object for method chaining.
     */
    public Builder sequenceNumberFlag(boolean sequenceNumberFlag) {
      this.sequenceNumberFlag = sequenceNumberFlag;
      return this;
    }

    /**
     * @param nPduNumberFlag nPduNumberFlag
     * @return this Builder object for method chaining.
     */
    public Builder nPduNumberFlag(boolean nPduNumberFlag) {
      this.nPduNumberFlag = nPduNumberFlag;
      return this;
    }

    /**
     * @param messageType messageType
     * @return this Builder object for method chaining.
     */
    public Builder messageType(GtpV1MessageType messageType) {
      this.messageType = messageType;
      return this;
    }

    /**
     * @param teid teid
     * @return this Builder object for method chaining.
     */
    public Builder teid(int teid) {
      this.teid = teid;
      return this;
    }

    /**
     * @param sequenceNumber sequenceNumber
     * @return this Builder object for method chaining.
     */
    public Builder sequenceNumber(Short sequenceNumber) {
      this.sequenceNumber = sequenceNumber;
      return this;
    }

    /**
     * @param nPduNumber nPduNumber
     * @return this Builder object for method chaining.
     */
    public Builder nPduNumber(Byte nPduNumber) {
      this.nPduNumber = nPduNumber;
      return this;
    }

    /**
     * @param nextExtensionHeaderType nextExtensionHeaderType
     * @return this Builder object for method chaining.
     */
    public Builder nextExtensionHeaderType(GtpV1ExtensionHeaderType nextExtensionHeaderType) {
      this.nextExtensionHeaderType = nextExtensionHeaderType;
      return this;
    }

    /**
     * @param version version
     * @return this Builder object for method chaining.
     */
    public Builder version(GtpVersion version) {
      this.version = version;
      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 GtpV1Packet build() {
      return new GtpV1Packet(this);
    }
  }

  /**
   * GTPv1 Header
   *
   * 
   *    8     7     6     5     4     3     2     1
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |    Version      | PT  | (*) |  E  |  S  | PN  |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |                 Message Type                  |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |              Length (1st Octet)               |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |              Length (2nd Octet)               |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |    Tunnel Endpoint Identifier (1st Octet)     |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |    Tunnel Endpoint Identifier (2nd Octet)     |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |    Tunnel Endpoint Identifier (3rd Octet)     |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |    Tunnel Endpoint Identifier (4th Octet)     |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |          Sequence Number (1st Octet)          |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |          Sequence Number (2nd Octet)          |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |                 N-PDU Number                  |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * |          Next Extension Header Type           |
   * +-----+-----+-----+-----+-----+-----+-----+-----+
   * 
* * @see ETSI * TS 129 060 V12.6.0 * @author Waveform * @author Kaito Yamada * @since pcap4j 1.6.6 */ public static final class GtpV1Header extends AbstractHeader { /** */ private static final long serialVersionUID = -1746545325551976324L; private static final int FIRST_OCTET_OFFSET = 0; private static final int FIRST_OCTET_SIZE = BYTE_SIZE_IN_BYTES; private static final int MSG_TYPE_OFFSET = FIRST_OCTET_OFFSET + FIRST_OCTET_SIZE; private static final int MSG_TYPE_SIZE = BYTE_SIZE_IN_BYTES; private static final int LENGTH_OFFSET = MSG_TYPE_OFFSET + MSG_TYPE_SIZE; private static final int LENGTH_SIZE = SHORT_SIZE_IN_BYTES; private static final int TUNNEL_ID_OFFSET = LENGTH_OFFSET + LENGTH_SIZE; private static final int TUNNEL_ID_SIZE = INT_SIZE_IN_BYTES; private static final int GTP_V1_HEADER_MIM_SIZE = TUNNEL_ID_OFFSET + TUNNEL_ID_SIZE; private static final int SEQ_OFFSET = TUNNEL_ID_OFFSET + TUNNEL_ID_SIZE; private static final int SEQ_SIZE = SHORT_SIZE_IN_BYTES; private static final int NPDU_OFFSET = SEQ_OFFSET + SEQ_SIZE; private static final int NPDU_SIZE = BYTE_SIZE_IN_BYTES; private static final int NEXT_HEADER_OFFSET = NPDU_OFFSET + NPDU_SIZE; private static final int NEXT_HEADER_SIZE = BYTE_SIZE_IN_BYTES; private static final int GTP_V1_HEADER_MAX_SIZE = NEXT_HEADER_OFFSET + NEXT_HEADER_SIZE; private final GtpVersion version; private final ProtocolType protocolType; private final boolean reserved; private final boolean extensionHeaderFlag; private final boolean sequenceNumberFlag; private final boolean nPduNumberFlag; private final GtpV1MessageType messageType; private final short length; private final int teid; private final Short sequenceNumber; private final Byte nPduNumber; private final GtpV1ExtensionHeaderType nextExtensionHeaderType; private GtpV1Header(byte[] rawData, int offset, int length) throws IllegalRawDataException { if (length < GTP_V1_HEADER_MIM_SIZE) { StringBuilder sb = new StringBuilder(80); sb.append("The data is too short to build a GTPv1 header(") .append(GTP_V1_HEADER_MIM_SIZE) .append(" bytes). data: ") .append(ByteArrays.toHexString(rawData, " ")) .append(", offset: ") .append(offset) .append(", length: ") .append(length); throw new IllegalRawDataException(sb.toString()); } byte firstOctet = ByteArrays.getByte(rawData, FIRST_OCTET_OFFSET + offset); this.version = GtpVersion.getInstance((firstOctet >> 5) & 0x07); this.protocolType = ProtocolType.getInstance((firstOctet & 0x10) != 0); this.reserved = ((firstOctet & 0x08) >> 3) != 0; this.extensionHeaderFlag = ((firstOctet & 0x04) >> 2) != 0; this.sequenceNumberFlag = ((firstOctet & 0x02) >> 1) != 0; this.nPduNumberFlag = (firstOctet & 0x01) != 0; this.messageType = GtpV1MessageType.getInstance(ByteArrays.getByte(rawData, MSG_TYPE_OFFSET + offset)); this.length = ByteArrays.getShort(rawData, LENGTH_OFFSET + offset); this.teid = ByteArrays.getInt(rawData, TUNNEL_ID_OFFSET + offset); if (sequenceNumberFlag | nPduNumberFlag | extensionHeaderFlag) { if (length < GTP_V1_HEADER_MAX_SIZE) { StringBuilder sb = new StringBuilder(80); sb.append("The data is too short to build a GTPv1 header(") .append(GTP_V1_HEADER_MAX_SIZE) .append(" bytes). data: ") .append(ByteArrays.toHexString(rawData, " ")) .append(", offset: ") .append(offset) .append(", length: ") .append(length); throw new IllegalRawDataException(sb.toString()); } this.sequenceNumber = ByteArrays.getShort(rawData, SEQ_OFFSET + offset); this.nPduNumber = ByteArrays.getByte(rawData, NPDU_OFFSET + offset); this.nextExtensionHeaderType = GtpV1ExtensionHeaderType.getInstance(rawData[NEXT_HEADER_OFFSET + offset]); } else { this.sequenceNumber = null; this.nPduNumber = null; this.nextExtensionHeaderType = null; } } private GtpV1Header(Builder builder, int payloadLen) { this.protocolType = builder.protocolType; this.version = builder.version; this.reserved = builder.reserved; this.messageType = builder.messageType; this.nPduNumberFlag = builder.nPduNumberFlag; this.sequenceNumber = builder.sequenceNumber; this.nPduNumber = builder.nPduNumber; this.nextExtensionHeaderType = builder.nextExtensionHeaderType; this.sequenceNumberFlag = builder.sequenceNumberFlag; this.teid = builder.teid; this.extensionHeaderFlag = builder.extensionHeaderFlag; if (builder.correctLengthAtBuild) { if (sequenceNumberFlag | nPduNumberFlag | extensionHeaderFlag) { this.length = (short) (payloadLen + 4); } else { this.length = (short) payloadLen; } } else { this.length = builder.length; } } /** @return version */ public GtpVersion getVersion() { return version; } /** @return protocolType. */ public ProtocolType getProtocolType() { return protocolType; } /** @return true if the reserved field is set to 1; false otherwise. */ public boolean getReserved() { return reserved; } /** @return true if the extension header flag is set to 1; false otherwise. */ public boolean isExtensionHeaderFieldPresent() { return extensionHeaderFlag; } /** @return true if the sequence number flag is set to 1; false otherwise. */ public boolean isSequenceNumberFieldPresent() { return sequenceNumberFlag; } /** @return true if the N-PDU number flag is set to 1; false otherwise. */ public boolean isNPduNumberFieldPresent() { return nPduNumberFlag; } /** @return messageType */ public GtpV1MessageType getMessageType() { return messageType; } /** @return length */ public short getLength() { return length; } /** @return length */ public int getLengthAsInt() { return 0xFFFF & length; } /** @return teid */ public int getTeid() { return teid; } /** @return teid */ public long getTeidAsLong() { return teid & 0xFFFFFFFFL; } /** @return sequenceNumber. May be null. */ public Short getSequenceNumber() { return sequenceNumber; } /** @return sequenceNumber. May be null. */ public Integer getSequenceNumberAsInt() { if (sequenceNumber == null) { return null; } else { return sequenceNumber & 0xFFFF; } } /** @return nPduNumber. May be null. */ public Byte getNPduNumber() { return nPduNumber; } /** @return nPduNumber. May be null. */ public Integer getNPduNumberAsInt() { if (nPduNumber == null) { return null; } else { return nPduNumber & 0xFF; } } /** @return nextExtensionHeaderType. May be null. */ public GtpV1ExtensionHeaderType getNextExtensionHeaderType() { return nextExtensionHeaderType; } @Override protected List getRawFields() { byte flags = (byte) (version.getValue() << 5); if (protocolType.getValue()) { flags |= 0x10; } if (reserved) { flags |= 0x08; } if (extensionHeaderFlag) { flags |= 0x04; } if (sequenceNumberFlag) { flags |= 0x02; } if (nPduNumberFlag) { flags |= 0x01; } List rawFields = new ArrayList(); rawFields.add(ByteArrays.toByteArray(flags)); rawFields.add(ByteArrays.toByteArray(messageType.value())); rawFields.add(ByteArrays.toByteArray(length)); rawFields.add(ByteArrays.toByteArray(teid)); if (sequenceNumber != null) { rawFields.add(ByteArrays.toByteArray(sequenceNumber)); } if (nPduNumber != null) { rawFields.add(ByteArrays.toByteArray(nPduNumber)); } if (nextExtensionHeaderType != null) { rawFields.add(ByteArrays.toByteArray(nextExtensionHeaderType.value())); } return rawFields; } @Override protected int calcLength() { int len = GTP_V1_HEADER_MIM_SIZE; if (sequenceNumber != null) { len += SHORT_SIZE_IN_BYTES; } if (nPduNumber != null) { len += BYTE_SIZE_IN_BYTES; } if (nextExtensionHeaderType != null) { len += BYTE_SIZE_IN_BYTES; } return len; } @Override protected String buildString() { StringBuilder sb = new StringBuilder(); String ls = System.getProperty("line.separator"); sb.append("[GTPv1 Header (").append(length()).append(" bytes)]").append(ls); sb.append(" Version: ").append(version).append(ls); sb.append(" Protocol Type: ").append(protocolType).append(ls); sb.append(" Reserved Flag: ").append(reserved).append(ls); sb.append(" Extension Flag: ").append(extensionHeaderFlag).append(ls); sb.append(" Sequence Flag: ").append(sequenceNumberFlag).append(ls); sb.append(" NPDU Flag: ").append(nPduNumberFlag).append(ls); sb.append(" Message Type: ").append(messageType).append(ls); sb.append(" Length: ").append(getLengthAsInt()).append(" [bytes]").append(ls); sb.append(" Tunnel ID: ").append(getTeidAsLong()).append(ls); if (sequenceNumber != null) { sb.append(" Sequence Number: ").append(getSequenceNumberAsInt()).append(ls); } if (nPduNumber != null) { sb.append(" NPDU Number: ").append(getNPduNumberAsInt()).append(ls); } if (nextExtensionHeaderType != null) { sb.append(" Next Extension Header: ").append(getNextExtensionHeaderType()).append(ls); } return sb.toString(); } @Override protected int calcHashCode() { final int prime = 31; int result = 17; result = prime * result + (extensionHeaderFlag ? 1231 : 1237); result = prime * result + length; result = prime * result + messageType.hashCode(); result = prime * result + ((nPduNumber == null) ? 0 : nPduNumber.hashCode()); result = prime * result + (nPduNumberFlag ? 1231 : 1237); result = prime * result + ((nextExtensionHeaderType == null) ? 0 : nextExtensionHeaderType.hashCode()); result = prime * result + protocolType.hashCode(); result = prime * result + (reserved ? 1231 : 1237); result = prime * result + ((sequenceNumber == null) ? 0 : sequenceNumber.hashCode()); result = prime * result + (sequenceNumberFlag ? 1231 : 1237); result = prime * result + teid; result = prime * result + version.hashCode(); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (!this.getClass().isInstance(obj)) return false; GtpV1Header other = (GtpV1Header) obj; if (extensionHeaderFlag != other.extensionHeaderFlag) return false; if (length != other.length) return false; if (!messageType.equals(other.messageType)) return false; if (nPduNumber == null) { if (other.nPduNumber != null) return false; } else if (!nPduNumber.equals(other.nPduNumber)) return false; if (nPduNumberFlag != other.nPduNumberFlag) return false; if (nextExtensionHeaderType == null) { if (other.nextExtensionHeaderType != null) return false; } else if (!nextExtensionHeaderType.equals(other.nextExtensionHeaderType)) return false; if (protocolType != other.protocolType) return false; if (reserved != other.reserved) return false; if (sequenceNumber == null) { if (other.sequenceNumber != null) return false; } else if (!sequenceNumber.equals(other.sequenceNumber)) return false; if (sequenceNumberFlag != other.sequenceNumberFlag) return false; if (teid != other.teid) return false; if (version != other.version) return false; return true; } } /** * GTP Protocol Type * * @see ETSI * TS 129 060 V12.6.0 * @author Kaito Yamada * @since pcap4j 1.6.6 */ public enum ProtocolType { /** GTP': false */ GTP_PRIME(false), /** GTP: true */ GTP(true); private final boolean value; private ProtocolType(boolean value) { this.value = value; } /** * @param value value * @return a ProtocolType object. */ public static ProtocolType getInstance(boolean value) { for (ProtocolType ver : values()) { if (ver.value == value) { return ver; } } throw new IllegalArgumentException("Invalid value: " + value); } /** @return true if GTP; false otherwise (GTP'). */ public boolean getValue() { return value; } @Override public String toString() { return value ? "GTP" : "GTP'"; } } }




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