Examples of org.jnetpcap.protocol.tcpip.Tcp.checksum()

org.jnetpcap.protocol.tcpip.Tcp.checksum()
Checksum (16 bits). The 16-bit checksum field is used for error-checking of the header and data . @return the field's value


    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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        assertTrue("#" + f, packet.hasHeader(ip));


        final int crc =
            Checksum.pseudoTcp(packet, ip.getOffset(), tcp.getOffset());


        if (crc != 0 && tcp.checksum() != crc) {
          System.out.println(tcp);
          System.out.printf("#%d: tcp.crc=%x computed=%x\n", f, tcp.checksum(),
              crc);
          // System.out.println(ip.toHexdump());
          // System.out.println(tcp.toHexdump());

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        final int crc =
            Checksum.pseudoTcp(packet, ip.getOffset(), tcp.getOffset());


        if (crc != 0 && tcp.checksum() != crc) {
          System.out.println(tcp);
          System.out.printf("#%d: tcp.crc=%x computed=%x\n", f, tcp.checksum(),
              crc);
          // System.out.println(ip.toHexdump());
          // System.out.println(tcp.toHexdump());
          System.exit(0);
        }

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