Examples of JPacket

org.jnetpcap.packet.JPacket
A native packet buffer object. This class references both packet data buffer and decoded native packet structure. JPacket class is a subclass of a more general JBuffer providing full access to raw packet buffer data. It also has a reference to JPacket.State object which is peered, associated with, a native packet state structure generated by the packet scanner, the JScanner.
The packet interface provides numerous methods for accessing the decoded information. To check if any particular header is found within the packet's data buffer at the time the packet was scanned, the user can use {@link #hasHeader} methods. The method returns true if a particular header isfound within the packet data buffer, otherwise false. A convenience method {@link #hasHeader(JHeader)} exists that performs both an existance check andinitializes the header instace supplied to point at the header within the packet.

There are also numerous peer and deep copy methods. The peering methods do not copy any buffers but simply re-orient the pointers to point at the source peer structures to destination peer. The deep copy methods do copy physical data out of buffers and entire structures using native copy functions, not in java space.
@author Mark Bednarczyk @author Sly Technologies, Inc.

Examples of org.jnetpcap.packet.JPacket

   *           Signals that an I/O exception has occurred.
   */
  public void testSubHeader() throws IOException {
    JFormatter out = new TextFormatter(OUT);
    
    JPacket packet = TestUtils.getPcapPacket("tests/test-afs.pcap", 0);


    out.format(packet);
  }

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Examples of org.jnetpcap.packet.JPacket

   * 
   * @throws UnknownHostException
   *           the unknown host exception
   */
  public void testSendPacketUsingJBuffer() throws UnknownHostException {
    JPacket packet =
        new JMemoryPacket(JProtocol.ETHERNET_ID,
            "0016b6c13cb10021 5db0456c08004500 "
                + "00340e8e40008006 9c54c0a80165d822 "
                + "b5b1c1cf005020ce 4303000000008002 "
                + "2000d94300000204 05b4010303020101 " + "0402");


    InetAddress dst = InetAddress.getByName("201.1.1.1");
    InetAddress src = InetAddress.getByName("192.168.1.1");


    Ip4 ip = packet.getHeader(new Ip4());
    Tcp tcp = packet.getHeader(new Tcp());


    ip.destination(dst.getAddress());
    ip.source(src.getAddress());


    ip.checksum(ip.calculateChecksum());
    tcp.checksum(tcp.calculateChecksum());
    packet.scan(Ethernet.ID);


    System.out.println(packet);
    List<PcapIf> alldevs = new ArrayList<PcapIf>(); // Will be filled with NICs
    StringBuilder errbuf = new StringBuilder(); // For any error msgs
    /***************************************************************************

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Examples of org.jnetpcap.packet.JPacket

   * 
   * @return header's stored checksum
   */
  @Field(length = 4 * BYTE, format = "%x", display = "FCS")
  public long checksum() {
    final JPacket packet = getPacket();
    packet.order(ByteOrder.BIG_ENDIAN);
    return packet.getUInt(getPostfixOffset());
  }

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Examples of org.jnetpcap.packet.JPacket

  public long calculateChecksum() {
    if (getPostfixLength() < 4) {
      return 0L;
    }
    
    final JPacket packet = getPacket();
    return Checksum.crc32IEEE802(packet, 0, packet.size() - 4);
  }

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Examples of org.jnetpcap.packet.JPacket

   * 
   * @return header's stored checksum
   */
  @Field(length = 4 * BYTE, format = "%x", display = "FCS")
  public long checksum() {
    final JPacket packet = getPacket();
    packet.order(ByteOrder.BIG_ENDIAN);
    return packet.getUInt(getPostfixOffset());
  }

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Examples of org.jnetpcap.packet.JPacket

  public boolean checksum(long crc) {
    if (getPostfixLength() < 4) {
      return false;
    }


    final JPacket packet = getPacket();
    packet.order(ByteOrder.BIG_ENDIAN);


    packet.setUInt(packet.size() - 4, crc);


    return true;
  }

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Examples of org.jnetpcap.packet.JPacket

   * 
   * @return the long
   */
  public long calculateChecksum() {


    final JPacket packet = getPacket();
    return Checksum.crc32IEEE802(packet, 0, getHeaderLength()
        + getPayloadLength());
  }

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Examples of org.jnetpcap.packet.JPacket

   * 
   * @throws IOException
   *           Signals that an I/O exception has occurred.
   */
  public void test1() throws IOException {
    JPacket packet = getPcapPacket(HTTP, 5);


    JFormatter out = new TextFormatter(System.out);


    out.format(packet);
  }

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Examples of org.jnetpcap.packet.JPacket

     * Packet extends JBuffer. The packet object is the one that is already
     * created for the scanner in the Pcap.loop call and is already peered. This
     * is better approach than getting the buffer with: JBuffer b = new
     * JBuffer(Type.POINTER); scan.scan_buf(b);
     */
    JPacket packet = scan.scan_packet();


    /*
     * Thats good
     */
    int offset = scan.scan_offset();

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