示例#1
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    int arg_index;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        /* options parsing should print error */
        skAppUsage();           /* never returns */
    }

    /* check for extraneous arguments */
    if (arg_index != argc) {
        skAppPrintErr("Too many arguments or unrecognized switch '%s'",
                      argv[arg_index]);
        skAppUsage();           /* never returns */
    }

    /* verify logging */
    if (sklogOptionsVerify()) {
        exit(EXIT_FAILURE);
    }

    /* write command line */
    sklogCommandLine(argc, argv);

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    return;  /* OK */
}
示例#2
0
文件: mapsid.c 项目: brettmeyers/silk
int main(int argc, char **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    int arg_index;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL)
        || sksiteOptionsRegister(SK_SITE_FLAG_CONFIG_FILE))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        /* options parsing should print error */
        skAppUsage();           /* never returns */
    }

    /* ensure the site config is available */
    if (sksiteConfigure(1)) {
        exit(EXIT_FAILURE);
    }

    /* if we are printing more than one sensor and a --print-* switch
     * was given, set the width of the sensor name fields so the
     * values align */
    if ((argc != arg_index + 1) && (print_descriptions || print_classes)) {
        sensor_name_width = -1 * (int)sksiteSensorGetMaxNameStrLen();
    }

    if (argc > arg_index) {
        for ( ; arg_index < argc; ++arg_index) {
            printByNameOrNumber(argv[arg_index]);
        }
    } else {
        /* no args. print all */
        printAllSensors();
    }

    skAppUnregister();

    return 0;
}
示例#3
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    int arg_index;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    memset(&prefixmap_test_opt, 0, sizeof(prefixmap_test_opt));

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        /* options parsing should print error */
        skAppUsage();           /* never returns */
    }

    if ( (NULL == prefixmap_test_opt.map_file) ||
         (0 == prefixmap_test_opt.have_address) ) {
        if ( NULL == prefixmap_test_opt.map_file ) {
            skAppPrintErr("Required argument map-file not provided.");
        }
        if ( 0 == prefixmap_test_opt.have_address ) {
            skAppPrintErr("Required argument address not provided.");
        }
        exit(EXIT_FAILURE);
    }

    return;  /* OK */
}
示例#4
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);

    /* verify same number of options and help strings */
    assert((sizeof(appHelp) / sizeof(char *)) ==
           (sizeof(appOptions) / sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* register the options */
    if (skOptionsRegister(appOptions, & appOptionsHandler, NULL)) {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* register the teardown hanlder */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* parse options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        skAppUsage();                            /* never returns */
    }

    /* get the pattern */
    pattern = argv[arg_index++];
    if (NULL == pattern) {
        skAppPrintErr("No pattern specified");
        skAppUsage();
    }

    /* either need name of set file(s) after options or a set file on stdin */
    if ((arg_index == argc) && (FILEIsATty(stdin))) {
        skAppPrintErr("No files on the command line and"
                      " stdin is connected to a terminal");
        skAppUsage();
    }

    return;                                      /* OK */
}
示例#5
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL)
        || sksiteOptionsRegister(SK_SITE_FLAG_CONFIG_FILE))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        /* options parsing should print error */
        skAppUsage();           /* never returns */
    }

    /* try to load site config file; if it fails, we will not be able
     * to resolve flowtype and sensor from input file names */
    sksiteConfigure(0);

    /* arg_index is looking at first file name to process */
    if (arg_index + 2 != argc) {
        skAppPrintErr("Expected two file names on the command line");
        skAppUsage();       /* never returns */
    }

    return;  /* OK */
}
示例#6
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    int arg_index;
    int rv;

    /* check that we have the same number of options entries and help*/
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* initialize globals */
    shuttingdown    = 0;
    destination_dir = NULL;
    duplicate_dirs  = skDLListCreate(NULL);
    if (duplicate_dirs == NULL) {
        skAppPrintOutOfMemory("duplicate directory list");
        exit(EXIT_FAILURE);
    }
    open_file_list  = skDLListCreate(NULL);
    if (open_file_list == NULL) {
        skAppPrintOutOfMemory("open file list");
        exit(EXIT_FAILURE);
    }

    transfers = transferIdentTreeCreate();
    if (transfers == NULL) {
        skAppPrintOutOfMemory("receiver data structure");
        exit(EXIT_FAILURE);
    }
#ifdef SK_HAVE_STATVFS
    {
        uint64_t tmp_64;
        rv = skStringParseHumanUint64(&tmp_64, DEFAULT_FREESPACE_MINIMUM,
                                     SK_HUMAN_NORMAL);
        if (rv) {
            skAppPrintErr("Bad default value for freespace_minimum: '%s': %s",
                          DEFAULT_FREESPACE_MINIMUM,skStringParseStrerror(rv));
            exit(EXIT_FAILURE);
        }
        freespace_minimum = (int64_t)tmp_64;
    }
#endif /* SK_HAVE_STATVFS */

    /* register the options and handler */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL))
    {
        skAppPrintErr("Unable to register application options");
        exit(EXIT_FAILURE);
    }

    /* Register the other transfer options */
    if (transferSetup()) {
        exit(EXIT_FAILURE);
    }

    /* rwreceiver runs as a daemon */
    if (skdaemonSetup((SKLOG_FEATURE_LEGACY | SKLOG_FEATURE_SYSLOG),
                      argc, argv))
    {
        exit(EXIT_FAILURE);
    }

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        /* options parsing should print error */
        skAppUsage();           /* never returns */
    }

    /* Verify the options */
    rv = rwreceiverVerifyOptions();

    /* verify the required options for logging */
    if (skdaemonOptionsVerify()) {
        rv = -1;
    }

    if (rv) {
        skAppUsage();           /* never returns */
    }

    /* check for extraneous arguments */
    if (arg_index != argc) {
        skAppPrintErr("Too many arguments or unrecognized switch --%s",
                      argv[arg_index]);
        skAppUsage();           /* never returns */
    }

    /* Identify the main thread */
    skthread_init("main");

    return;  /* OK */
}
示例#7
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    int rv;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* initialize globals */
#error "Initialize any global variables here"
    /* for example: set global output to NULL */
    out_stream = NULL;

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL)
        || sksiteOptionsRegister(SK_SITE_FLAG_CONFIG_FILE))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

#error "Do any other module setup here"

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        /* options parsing should print error */
        skAppUsage();           /* never returns */
    }

    /* try to load site config file; if it fails, we will not be able
     * to resolve flowtype and sensor from input file names */
    sksiteConfigure(0);

#error "Do any options validation here"

#error "If you expect filenames on command line keep this:"
    /* arg_index is looking at first file name to process */
    if (arg_index == argc) {
        if (FILEIsATty(stdin)) {
            skAppPrintErr("No input files on command line and"
                          " stdin is connected to a terminal");
            skAppUsage();       /* never returns */
        }
    }

#error "If you do NOT expect filenames on command line, keep this:"
    /* check for extraneous arguments */
    if (arg_index != argc) {
        skAppPrintErr("Too many arguments or unrecognized switch '%s'",
                      argv[arg_index]);
        skAppUsage();           /* never returns */
    }

#error "Once all options are set, open input and output"
    /* for example, open a SiLK flow file as an output file */
    rv = skStreamOpenSilkFlow(&out_stream, output_path, SK_IO_WRITE);
    if (rv) {
        skStreamPrintLastErr(out_stream, rv, &skAppPrintErr);
        skAppPrintErr("Unable to open output file. Exiting");
        skStreamDestroy(&out_stream);
        exit(EXIT_FAILURE);
    }

    return;  /* OK */
}
示例#8
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    const char *in_fname;
    const char *out_fname;
    int arg_index;
    int rv;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* initialize globals */
    memset(&set_options, 0, sizeof(skipset_options_t));
    set_options.argc = argc;
    set_options.argv = argv;

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL)
        || skIPSetOptionsRegister(&set_options))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        skAppUsage(); /* never returns */
    }

    /* default is to read from stdin and write to stdout */
    in_fname = "-";
    out_fname = "-";

    /* process files named on the command line */
    switch (argc - arg_index) {
      case 2:
        in_fname = argv[arg_index++];
        out_fname = argv[arg_index++];
        break;

      case 1:
        in_fname = argv[arg_index++];
        break;

      case 0:
        /* Do not allow reading from a tty when no input */
        if (FILEIsATty(stdin)) {
            skAppPrintErr("Must specify '-' as the input to read"
                          " from a terminal");
            exit(EXIT_FAILURE);
        }
        break;

      default:
        skAppPrintErr("Too many arguments;"
                      " a maximum of two files may be specified");
        skAppUsage();
    }

    /* we should have processed all arguments */
    assert(arg_index == argc);

    /* create the IPset */
    if (skIPSetCreate(&ipset, 0)) {
        EXIT_NO_MEMORY;
    }
    skIPSetOptionsBind(ipset, &set_options);

    /* create input */
    if ((rv = skStreamCreate(&in_stream, SK_IO_READ, SK_CONTENT_TEXT))
        || (rv = skStreamBind(in_stream, in_fname))
        || (rv = skStreamSetCommentStart(in_stream, "#")))
    {
        skStreamPrintLastErr(in_stream, rv, &skAppPrintErr);
        exit(EXIT_FAILURE);
    }

    /* create output */
    if ((rv = skStreamCreate(&out_stream, SK_IO_WRITE, SK_CONTENT_SILK))
        || (rv = skStreamBind(out_stream, out_fname)))
    {
        skStreamPrintLastErr(out_stream, rv, &skAppPrintErr);
        exit(EXIT_FAILURE);
    }

    /* open the streams */
    rv = skStreamOpen(in_stream);
    if (rv) {
        skStreamPrintLastErr(in_stream, rv, &skAppPrintErr);
        exit(EXIT_FAILURE);
    }
    rv = skStreamOpen(out_stream);
    if (rv) {
        skStreamPrintLastErr(out_stream, rv, &skAppPrintErr);
        exit(EXIT_FAILURE);
    }
}
示例#9
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    int arg_index;
    int rv;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* register the teardown hanlder */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        /* options parsing should print error */
        skAppUsage();           /* never returns */
    }

    /* check for extraneous arguments */
    if (arg_index != argc) {
        skAppPrintErr("Too many arguments or unrecognized switch '%s'",
                      argv[arg_index]);
        skAppUsage();             /* never returns */
    }

    /* check for one and only one of --input-file and --address */
    if (NULL != app_opt.input_file) {
        if (NULL != app_opt.address) {
            skAppPrintErr("Only one of --%s or --%s may be specified.",
                          appOptions[OPT_ADDRESS].name,
                          appOptions[OPT_INPUT_FILE].name);
            skAppUsage();
        }
    } else if (NULL == app_opt.address) {
        skAppPrintErr("Either the --%s or --%s option is required.",
                      appOptions[OPT_ADDRESS].name,
                      appOptions[OPT_INPUT_FILE].name);
        skAppUsage();
    }

    /* find and load the map file */
    if (skCountrySetup(app_opt.map_file, &skAppPrintErr)) {
        exit(EXIT_FAILURE);
    }

    /* use default for print-ips if unset by user */
    if (-1 == app_opt.print_ips) {
        if (app_opt.input_file) {
            app_opt.print_ips = 1;
        } else {
            app_opt.print_ips = 0;
        }
    }

    /* create the output stream. Only page output when processing
     * input file */
    if ((rv = skStreamCreate(&out, SK_IO_WRITE, SK_CONTENT_TEXT))
        || (rv = skStreamBind(out, app_opt.output_path)))
    {
        skStreamPrintLastErr(out, rv, &skAppPrintErr);
        exit(EXIT_FAILURE);
    }
    if (app_opt.input_file) {
        rv = skStreamPageOutput(out, app_opt.pager);
        if (rv) {
            skStreamPrintLastErr(out, rv, &skAppPrintErr);
            exit(EXIT_FAILURE);
        }
    }
    rv = skStreamOpen(out);
    if (rv) {
        skStreamPrintLastErr(out, rv, &skAppPrintErr);
        exit(EXIT_FAILURE);
    }

    return;  /* OK */
}
示例#10
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 *
 *    NOTE: Make this extern due to declaration in rwfilter.h.
 */
void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    int rv;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char *)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* Set up the fglob module */
    if (fglobSetup()){
        skAppPrintErr("Unable to setup fglob module");
        exit(EXIT_FAILURE);
    }

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* Parse the options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        skAppUsage();
    }

    /* try to load site config file; if it fails, we will not be able
     * to resolve flowtype and sensor from input file names */
    sksiteConfigure(0);

    /* check for extraneous arguments */
    if (arg_index != argc) {
        skAppPrintErr("Too many arguments or unrecognized switch '%s'",
                      argv[arg_index]);
        skAppUsage();
    }

    /* verify that an fglob option was provided and that everything is
     * ok with the setup. */
    rv = fglobValid();
    if (rv == -1) {
        exit(EXIT_FAILURE);
    }
    if (rv == 0) {
        skAppPrintErr("Must specify at least one file selection switch");
        exit(EXIT_FAILURE);
    }


    return;  /* OK */
}
示例#11
0
/*
 *  appSetup(argc, argv);
 *
 *    Perform all the setup for this application include setting up
 *    required modules, parsing options, etc.  This function should be
 *    passed the same arguments that were passed into main().
 *
 *    Returns to the caller if all setup succeeds.  If anything fails,
 *    this function will cause the application to exit with a FAILURE
 *    exit status.
 */
static void
appSetup(
    int                 argc,
    char              **argv)
{
    SILK_FEATURES_DEFINE_STRUCT(features);
    char errbuf[PCAP_ERRBUF_SIZE];
    int arg_index;

    /* verify same number of options and help strings */
    assert((sizeof(appHelp)/sizeof(char*)) ==
           (sizeof(appOptions)/sizeof(struct option)));

    /* register the application */
    skAppRegister(argv[0]);
    skAppVerifyFeatures(&features, NULL);
    skOptionsSetUsageCallback(&appUsageLong);

    /* register the options */
    if (skOptionsRegister(appOptions, &appOptionsHandler, NULL))
    {
        skAppPrintErr("Unable to register options");
        exit(EXIT_FAILURE);
    }

    /* register the teardown handler */
    if (atexit(appTeardown) < 0) {
        skAppPrintErr("Unable to register appTeardown() with atexit()");
        appTeardown();
        exit(EXIT_FAILURE);
    }

    /* parse options */
    arg_index = skOptionsParse(argc, argv);
    if (arg_index < 0) {
        skAppUsage(); /* never returns */
    }

    /* verify input file */
    if (arg_index >= argc) {
        skAppPrintErr("No input packet file found");
        skAppUsage();             /* never returns */
    }

    /* verify output is not a terminal */
    if (FILEIsATty(stdout)) {
        skAppPrintErr("stdout is connected to a terminal");
        skAppUsage();             /* never returns */
    }

    /* open input file */
    g_pkt_input = pcap_open_offline(argv[arg_index], errbuf);
    if (g_pkt_input == NULL) {
        skAppPrintErr("Unable to open input file %s: %s",
                      argv[arg_index], errbuf);
        exit(EXIT_FAILURE);
    }

    /* open output file (tcpdump format packet file) */
    g_output = pcap_open_dead(pcap_datalink(g_pkt_input),
                              pcap_snapshot(g_pkt_input));
    if (g_output == NULL) {
        skAppPrintErr("Error opening stdout: %s", errbuf);
        exit(EXIT_FAILURE);
    }

    g_output_dumper = pcap_dump_open(g_output, "-");
    if (g_output_dumper == NULL) {
        skAppPrintErr("Error opening stdout: %s", pcap_geterr(g_output));
        exit(EXIT_FAILURE);
    }

    return; /* OK */
}