Examples of org.jnetpcap.protocol.network.Ip4.calculateChecksum()

org.jnetpcap.protocol.network.Ip4.calculateChecksum()
Calculates a checksum using protocol specification for a header. Checksums for partial headers or fragmented packets (unless the protocol alows it) are not calculated. @return header's calculated checksum

    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

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  public void testIp4CRC16Pkt2() {


    JPacket packet = super.getPcapPacket(TestUtils.L2TP, 1);
    Ip4 ip = packet.getHeader(new Ip4());


    assertEquals(ip.calculateChecksum(), ip.checksum());
  }


  /**
   * Test ip4 cr c16 pkt50.
   */

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    JPacket packet = super.getPcapPacket(TestUtils.L2TP, 46 - 1);
    Ip4 ip = packet.getHeader(new Ip4());


    int crc;
    assertEquals(ip.checksum(), ip.calculateChecksum());


    // System.out.printf("ip.crc=%x computed=%x\n", ip.checksum(), crc);
  }


  /**

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      Thread.sleep(10);
      long f = packet.getFrameNumber() + 1;
      assertTrue(packet.hasHeader(ip));


      assertEquals(20, ip.size());
      final int crc = ip.calculateChecksum();


      if (ip.checksum() != crc) {
        try {
          System.out.println(packet.getState().toDebugString());
          System.out.println(packet);

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        int c1 = ip1.calculateChecksum();


        PcapPacket p2 = new PcapPacket(p1);
        p2.getHeader(ip2);


        int c2 = ip2.calculateChecksum();


        if (c1 != c2) {
          System.out.printf("#%d crc_before=%x crc_after=%x\n", i, c1, c2);
          System.out.printf(
              "P1: %s\nheader1=%s\n\nstate1=%s\npacket1=%s\n\nip1=%s\n", p1

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