Examples of org.jnetpcap.Pcap.compile()

org.jnetpcap.Pcap.compile()
Compile a packet filter, converting a high level filtering expression in to a progra that can be interpreted by the kernel-level filtering engine. @param program initially empty, but after the method call will contain the compiled BPF program @param str a string containing the textual expression to be compiled @param optimize 1 means to do optimizations, any other value means no @param netmask netmask needed to determine the broadcast address @return A return of -1 indicates an error in which case {@link #getErr()}may be used to display the error text.

    final Pcap pcap = Pcap.openOffline(file, errbuf);
    assertNotNull(errbuf.toString());


    if (filter != null) {
      PcapBpfProgram prog = new PcapBpfProgram();
      if (pcap.compile(prog, filter, 0, 0xffffff00) != Pcap.OK) {
        System.err.printf("pcap filter %s: %s\n", pcap.getErr(), filter);
        return null;
      }
      pcap.setFilter(prog);
    }

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      fail(errbuf.toString());
    }


    if (filter != null) {
      PcapBpfProgram program = new PcapBpfProgram();
      if (pcap.compile(program, filter, 0, 0) != Pcap.OK) {
        System.err.printf("pcap filter err: %s\n", pcap.getErr());
      }


      pcap.setFilter(program);
    }

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