aboutsummaryrefslogtreecommitdiffstats
path: root/ui/commandline.c
blob: 24e44aae88f186e23c9f5c2fd5702f726cb8d469 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
/* commandline.c
 * Common command line handling between GUIs
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <glib.h>

#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif

#ifndef HAVE_GETOPT_LONG
#include "wsutil/wsgetopt.h"
#endif

#include <ws_version_info.h>

#include <wsutil/clopts_common.h>
#include <wsutil/cmdarg_err.h>
#include <wsutil/filesystem.h>

#include <epan/ex-opt.h>
#include <epan/packet.h>
#include <epan/proto.h>
#include <epan/prefs.h>
#include <epan/prefs-int.h>
#include <epan/stat_tap_ui.h>

#include "capture_opts.h"
#include "persfilepath_opt.h"
#include "preference_utils.h"
#include "console.h"
#include "recent.h"
#include "decode_as_utils.h"

#include "../file.h"

#include "ui/dissect_opts.h"

#include "ui/commandline.h"

commandline_param_info_t global_commandline_info;

#if defined(HAVE_LIBPCAP) || defined(HAVE_EXTCAP)
capture_options global_capture_opts;
#endif

void
commandline_print_usage(gboolean for_help_option) {
    FILE *output;

#ifdef _WIN32
    create_console();
#endif

    if (for_help_option) {
        output = stdout;
        fprintf(output, "Wireshark %s\n"
            "Interactively dump and analyze network traffic.\n"
            "See https://www.wireshark.org for more information.\n",
            get_ws_vcs_version_info());
    } else {
        output = stderr;
    }
    fprintf(output, "\n");
    fprintf(output, "Usage: wireshark [options] ... [ <infile> ]\n");
    fprintf(output, "\n");

#ifdef HAVE_LIBPCAP
    fprintf(output, "Capture interface:\n");
    fprintf(output, "  -i <interface>           name or idx of interface (def: first non-loopback)\n");
    fprintf(output, "  -f <capture filter>      packet filter in libpcap filter syntax\n");
    fprintf(output, "  -s <snaplen>             packet snapshot length (def: 65535)\n");
    fprintf(output, "  -p                       don't capture in promiscuous mode\n");
    fprintf(output, "  -k                       start capturing immediately (def: do nothing)\n");
    fprintf(output, "  -S                       update packet display when new packets are captured\n");
    fprintf(output, "  -l                       turn on automatic scrolling while -S is in use\n");
#ifdef HAVE_PCAP_CREATE
    fprintf(output, "  -I                       capture in monitor mode, if available\n");
#endif
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
    fprintf(output, "  -B <buffer size>         size of kernel buffer (def: %dMB)\n", DEFAULT_CAPTURE_BUFFER_SIZE);
#endif
    fprintf(output, "  -y <link type>           link layer type (def: first appropriate)\n");
    fprintf(output, "  -D                       print list of interfaces and exit\n");
    fprintf(output, "  -L                       print list of link-layer types of iface and exit\n");
    fprintf(output, "\n");
    fprintf(output, "Capture stop conditions:\n");
    fprintf(output, "  -c <packet count>        stop after n packets (def: infinite)\n");
    fprintf(output, "  -a <autostop cond.> ...  duration:NUM - stop after NUM seconds\n");
    fprintf(output, "                           filesize:NUM - stop this file after NUM KB\n");
    fprintf(output, "                              files:NUM - stop after NUM files\n");
    /*fprintf(output, "\n");*/
    fprintf(output, "Capture output:\n");
    fprintf(output, "  -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
    fprintf(output, "                           filesize:NUM - switch to next file after NUM KB\n");
    fprintf(output, "                              files:NUM - ringbuffer: replace after NUM files\n");
#endif  /* HAVE_LIBPCAP */
#ifdef HAVE_PCAP_REMOTE
    fprintf(output, "RPCAP options:\n");
    fprintf(output, "  -A <user>:<password>     use RPCAP password authentication\n");
#endif
    /*fprintf(output, "\n");*/
    fprintf(output, "Input file:\n");
    fprintf(output, "  -r <infile>              set the filename to read from (no pipes or stdin!)\n");

    fprintf(output, "\n");
    fprintf(output, "Processing:\n");
    fprintf(output, "  -R <read filter>         packet filter in Wireshark display filter syntax\n");
    fprintf(output, "  -n                       disable all name resolutions (def: all enabled)\n");
    fprintf(output, "  -N <name resolve flags>  enable specific name resolution(s): \"mnNtd\"\n");
    fprintf(output, "  -d %s ...\n", DECODE_AS_ARG_TEMPLATE);
    fprintf(output, "                           \"Decode As\", see the man page for details\n");
    fprintf(output, "                           Example: tcp.port==8888,http\n");
    fprintf(output, "  --disable-protocol <proto_name>\n");
    fprintf(output, "                           disable dissection of proto_name\n");
    fprintf(output, "  --enable-heuristic <short_name>\n");
    fprintf(output, "                           enable dissection of heuristic protocol\n");
    fprintf(output, "  --disable-heuristic <short_name>\n");
    fprintf(output, "                           disable dissection of heuristic protocol\n");

    fprintf(output, "\n");
    fprintf(output, "User interface:\n");
    fprintf(output, "  -C <config profile>      start with specified configuration profile\n");
    fprintf(output, "  -Y <display filter>      start with the given display filter\n");
    fprintf(output, "  -g <packet number>       go to specified packet number after \"-r\"\n");
    fprintf(output, "  -J <jump filter>         jump to the first packet matching the (display)\n");
    fprintf(output, "                           filter\n");
    fprintf(output, "  -j                       search backwards for a matching packet after \"-J\"\n");
    fprintf(output, "  -m <font>                set the font name used for most text\n");
    fprintf(output, "  -t a|ad|d|dd|e|r|u|ud    output format of time stamps (def: r: rel. to first)\n");
    fprintf(output, "  -u s|hms                 output format of seconds (def: s: seconds)\n");
    fprintf(output, "  -X <key>:<value>         eXtension options, see man page for details\n");
    fprintf(output, "  -z <statistics>          show various statistics, see man page for details\n");

    fprintf(output, "\n");
    fprintf(output, "Output:\n");
    fprintf(output, "  -w <outfile|->           set the output filename (or '-' for stdout)\n");

    fprintf(output, "\n");
    fprintf(output, "Miscellaneous:\n");
    fprintf(output, "  -h                       display this help and exit\n");
    fprintf(output, "  -v                       display version info and exit\n");
    fprintf(output, "  -P <key>:<path>          persconf:path - personal configuration files\n");
    fprintf(output, "                           persdata:path - personal data files\n");
    fprintf(output, "  -o <name>:<value> ...    override preference or recent setting\n");
    fprintf(output, "  -K <keytab>              keytab file to use for kerberos decryption\n");
#ifndef _WIN32
    fprintf(output, "  --display=DISPLAY        X display to use\n");
#endif
    fprintf(output, "  --fullscreen             start Wireshark in full screen\n");

#ifdef _WIN32
    destroy_console();
#endif
}

/*
 * For long options with no corresponding short options, we define values
 * outside the range of ASCII graphic characters, make that the last
 * component of the entry for the long option, and have a case for that
 * option in the switch statement.
 *
 * We also pick values >= 65536, so as to leave values from 128 to 65535
 * for capture and dissection options.
 */
#define LONGOPT_FULL_SCREEN       65536

#define OPTSTRING OPTSTRING_CAPTURE_COMMON OPTSTRING_DISSECT_COMMON "C:g:Hh" "jJ:klm:o:P:r:R:Svw:X:Y:z:"
static const struct option long_options[] = {
        {"help", no_argument, NULL, 'h'},
        {"read-file", required_argument, NULL, 'r' },
        {"read-filter", required_argument, NULL, 'R' },
        {"display-filter", required_argument, NULL, 'Y' },
        {"version", no_argument, NULL, 'v'},
        {"fullscreen", no_argument, NULL, LONGOPT_FULL_SCREEN },
        LONGOPT_CAPTURE_COMMON
        LONGOPT_DISSECT_COMMON
        {0, 0, 0, 0 }
    };
static const char optstring[] = OPTSTRING;

#ifndef HAVE_LIBPCAP
static void print_no_capture_support_error(void)
{
    cmdarg_err("This version of Wireshark was not built with support for capturing packets.");
}
#endif

void commandline_early_options(int argc, char *argv[],
    GString *comp_info_str, GString *runtime_info_str)
{
    int opt;
#ifdef HAVE_LIBPCAP
    int err;
    GList *if_list;
    gchar *err_str;
#else
    gboolean capture_option_specified;
#endif

    /*
     * In order to have the -X opts assigned before the wslua machine starts
     * we need to call getopt_long before epan_init() gets called.
     *
     * In addition, we process "console only" parameters (ones where we
     * send output to the console and exit) here, so we don't start GUI
     * if we're only showing command-line help or version information.
     *
     * XXX - this pre-scan is done before we start GUI, so we haven't
     * run "GUI init function" on the arguments.  That means that GUI-specific
     * arguments have not been removed from the argument list; those arguments
     * begin with "--", and will be treated as an error by getopt_long().
     *
     * We thus ignore errors - *and* set "opterr" to 0 to suppress the
     * error messages.
     *
     * XXX - should we, instead, first call gtk_parse_args(), without
     * calling gtk_init(), and then call this?
     *
     * In order to handle, for example, -o options, we also need to call it
     * *after* epan_init() gets called, so that the dissectors have had a
     * chance to register their preferences, so we have another getopt_long()
     * call later.
     *
     * XXX - can we do this all with one getopt_long() call, saving the
     * arguments we can't handle until after initializing libwireshark,
     * and then process them after initializing libwireshark?
     *
     * Note that we don't want to initialize libwireshark until after the
     * GUI is up, as that can take a while, and we want a window of some
     * sort up to show progress while that's happening.
     */
    opterr = 0;

#ifndef HAVE_LIBPCAP
    capture_option_specified = FALSE;
#endif
    while ((opt = getopt_long(argc, argv, optstring, long_options, NULL)) != -1) {
        switch (opt) {
            case 'C':        /* Configuration Profile */
                if (profile_exists (optarg, FALSE)) {
                    set_profile_name (optarg);
                } else {
                    cmdarg_err("Configuration Profile \"%s\" does not exist", optarg);
                    exit(1);
                }
                break;
            case 'D':        /* Print a list of capture devices and exit */
#ifdef HAVE_LIBPCAP
                if_list = capture_interface_list(&err, &err_str, NULL);
                if (if_list == NULL) {
                    if (err == 0)
                        cmdarg_err("There are no interfaces on which a capture can be done");
                    else {
                        cmdarg_err("%s", err_str);
                        g_free(err_str);
                    }
                    exit(2);
                }
#ifdef _WIN32
                create_console();
#endif /* _WIN32 */
                capture_opts_print_interfaces(if_list);
                free_interface_list(if_list);
#ifdef _WIN32
                destroy_console();
#endif /* _WIN32 */
                exit(0);
#else /* HAVE_LIBPCAP */
                capture_option_specified = TRUE;
#endif /* HAVE_LIBPCAP */
                break;
            case 'h':        /* Print help and exit */
                commandline_print_usage(TRUE);
                exit(0);
                break;
#ifdef _WIN32
            case 'i':
                if (strcmp(optarg, "-") == 0)
                    set_stdin_capture(TRUE);
                break;
#endif
            case 'P':        /* Personal file directory path settings - change these before the Preferences and alike are processed */
                if (!persfilepath_opt(opt, optarg)) {
                    cmdarg_err("-P flag \"%s\" failed (hint: is it quoted and existing?)", optarg);
                    exit(2);
                }
                break;
            case 'v':        /* Show version and exit */
#ifdef _WIN32
                create_console();
#endif
                show_version("Wireshark", comp_info_str, runtime_info_str);
#ifdef _WIN32
                destroy_console();
#endif
                exit(0);
                break;
            case 'X':
                /*
                 *  Extension command line options have to be processed before
                 *  we call epan_init() as they are supposed to be used by dissectors
                 *  or taps very early in the registration process.
                 */
                ex_opt_add(optarg);
                break;
            case '?':        /* Ignore errors - the "real" scan will catch them. */
                break;
        }
    }

#ifndef HAVE_LIBPCAP
    if (capture_option_specified) {
        print_no_capture_support_error();
        commandline_print_usage(FALSE);
        exit(1);
    }
#endif
}

void commandline_other_options(int argc, char *argv[], gboolean opt_reset)
{
    int opt;
    gboolean arg_error = FALSE;
#ifdef HAVE_LIBPCAP
    int status;
#else
    gboolean capture_option_specified;
#endif

    /*
     * To reset the options parser, set optreset to 1 on platforms that
     * have optreset (documented in *BSD and OS X, apparently present but
     * not documented in Solaris - the Illumos repository seems to
     * suggest that the first Solaris getopt_long(), at least as of 2004,
     * was based on the NetBSD one, it had optreset) and set optind to 1,
     * and set optind to 0 otherwise (documented as working in the GNU
     * getopt_long().  Setting optind to 0 didn't originally work in the
     * NetBSD one, but that was added later - we don't want to depend on
     * it if we have optreset).
     *
     * Also reset opterr to 1, so that error messages are printed by
     * getopt_long().
     *
     * XXX - if we want to control all the command-line option errors, so
     * that we can display them where we choose (e.g., in a window), we'd
     * want to leave opterr as 0, and produce our own messages using optopt.
     * We'd have to check the value of optopt to see if it's a valid option
     * letter, in which case *presumably* the error is "this option requires
     * an argument but none was specified", or not a valid option letter,
     * in which case *presumably* the error is "this option isn't valid".
     * Some versions of getopt() let you supply a option string beginning
     * with ':', which means that getopt() will return ':' rather than '?'
     * for "this option requires an argument but none was specified", but
     * not all do.  But we're now using getopt_long() - what does it do?
     */
    if (opt_reset) {
#ifdef HAVE_OPTRESET
        optreset = 1;
        optind = 1;
#else
        optind = 0;
#endif
        opterr = 1;
    }

    /* Initialize with default values */
    dissect_opts_init();
    global_commandline_info.jump_backwards = SD_FORWARD;
    global_commandline_info.go_to_packet = 0;
    global_commandline_info.jfilter = NULL;
    global_commandline_info.cf_name = NULL;
    global_commandline_info.rfilter = NULL;
    global_commandline_info.dfilter = NULL;
#ifdef HAVE_LIBPCAP
    global_commandline_info.start_capture = FALSE;
    global_commandline_info.list_link_layer_types = FALSE;
    global_commandline_info.quit_after_cap = getenv("WIRESHARK_QUIT_AFTER_CAPTURE") ? TRUE : FALSE;
#endif
    global_commandline_info.full_screen = FALSE;

    while ((opt = getopt_long(argc, argv, optstring, long_options, NULL)) != -1) {
        switch (opt) {
            /*** capture option specific ***/
            case 'a':        /* autostop criteria */
            case 'b':        /* Ringbuffer option */
            case 'c':        /* Capture xxx packets */
            case 'f':        /* capture filter */
            case 'k':        /* Start capture immediately */
            case 'H':        /* Hide capture info dialog box */
            case 'p':        /* Don't capture in promiscuous mode */
            case 'i':        /* Use interface x */
#ifdef HAVE_PCAP_CREATE
            case 'I':        /* Capture in monitor mode, if available */
#endif
#ifdef HAVE_PCAP_REMOTE
            case 'A':        /* Authentication */
#endif
            case 's':        /* Set the snapshot (capture) length */
            case 'S':        /* "Sync" mode: used for following file ala tail -f */
            case 'w':        /* Write to capture file xxx */
            case 'y':        /* Set the pcap data link type */
#ifdef CAN_SET_CAPTURE_BUFFER_SIZE
            case 'B':        /* Buffer size */
#endif
#ifdef HAVE_LIBPCAP
                status = capture_opts_add_opt(&global_capture_opts, opt, optarg,
                                              &global_commandline_info.start_capture);
                if(status != 0) {
                    exit(status);
                }
#else
                capture_option_specified = TRUE;
                arg_error = TRUE;
#endif
                break;

            /*** all non capture option specific ***/
            case 'C':
                /* Configuration profile settings were already processed just ignore them this time*/
                break;
            case 'j':        /* Search backwards for a matching packet from filter in option J */
                global_commandline_info.jump_backwards = SD_BACKWARD;
                break;
            case 'g':        /* Go to packet with the given packet number */
                global_commandline_info.go_to_packet = get_nonzero_guint32(optarg, "go to packet");
                break;
            case 'J':        /* Jump to the first packet which matches the filter criteria */
                global_commandline_info.jfilter = optarg;
                break;
            case 'l':        /* Automatic scrolling in live capture mode */
#ifdef HAVE_LIBPCAP
                auto_scroll_live = TRUE;
#else
                capture_option_specified = TRUE;
                arg_error = TRUE;
#endif
                break;
            case 'L':        /* Print list of link-layer types and exit */
#ifdef HAVE_LIBPCAP
                global_commandline_info.list_link_layer_types = TRUE;
#else
                capture_option_specified = TRUE;
                arg_error = TRUE;
#endif
                break;
            case 'o':        /* Override preference from command line */
                switch (prefs_set_pref(optarg)) {
                    case PREFS_SET_OK:
                        break;
                    case PREFS_SET_SYNTAX_ERR:
                        cmdarg_err("Invalid -o flag \"%s\"", optarg);
                        exit(1);
                        break;
                    case PREFS_SET_NO_SUCH_PREF:
                    /* not a preference, might be a recent setting */
                        switch (recent_set_arg(optarg)) {
                            case PREFS_SET_OK:
                                break;
                            case PREFS_SET_SYNTAX_ERR:
                                /* shouldn't happen, checked already above */
                                cmdarg_err("Invalid -o flag \"%s\"", optarg);
                                exit(1);
                                break;
                            case PREFS_SET_NO_SUCH_PREF:
                            case PREFS_SET_OBSOLETE:
                                cmdarg_err("-o flag \"%s\" specifies unknown preference/recent value",
                                           optarg);
                                exit(1);
                                break;
                            default:
                                g_assert_not_reached();
                        }
                        break;
                    case PREFS_SET_OBSOLETE:
                        cmdarg_err("-o flag \"%s\" specifies obsolete preference",
                                   optarg);
                        exit(1);
                        break;
                    default:
                        g_assert_not_reached();
                }
                break;
            case 'P':
                /* Path settings were already processed just ignore them this time*/
                break;
            case 'r':        /* Read capture file xxx */
                /* We may set "last_open_dir" to "cf_name", and if we change
                 "last_open_dir" later, we free the old value, so we have to
                 set "cf_name" to something that's been allocated. */
                global_commandline_info.cf_name = g_strdup(optarg);
                break;
            case 'R':        /* Read file filter */
                global_commandline_info.rfilter = optarg;
                break;
            case 'X':
                /* ext ops were already processed just ignore them this time*/
                break;
            case 'Y':
                global_commandline_info.dfilter = optarg;
                break;
            case 'z':
                /* We won't call the init function for the stat this soon
                 as it would disallow MATE's fields (which are registered
                 by the preferences set callback) from being used as
                 part of a tap filter.  Instead, we just add the argument
                 to a list of stat arguments. */
                if (strcmp("help", optarg) == 0) {
                  fprintf(stderr, "wireshark: The available statistics for the \"-z\" option are:\n");
                  list_stat_cmd_args();
                  exit(0);
                }
                if (!process_stat_cmd_arg(optarg)) {
                    cmdarg_err("Invalid -z argument.");
                    cmdarg_err_cont("  -z argument must be one of :");
                    list_stat_cmd_args();
                    exit(1);
                }
                break;
            case 'd':        /* Decode as rule */
            case 'K':        /* Kerberos keytab file */
            case 'n':        /* No name resolution */
            case 'N':        /* Select what types of addresses/port #s to resolve */
            case 't':        /* time stamp type */
            case 'u':        /* Seconds type */
            case LONGOPT_DISABLE_PROTOCOL: /* disable dissection of protocol */
            case LONGOPT_ENABLE_HEURISTIC: /* enable heuristic dissection of protocol */
            case LONGOPT_DISABLE_HEURISTIC: /* disable heuristic dissection of protocol */
            case LONGOPT_ENABLE_PROTOCOL: /* enable dissection of protocol (that is disabled by default) */
                if (!dissect_opts_handle_opt(opt, optarg))
                   exit(1);
                break;
            case LONGOPT_FULL_SCREEN:
                global_commandline_info.full_screen = TRUE;
                break;
            default:
            case '?':        /* Bad flag - print usage message */
                arg_error = TRUE;
                break;
            }
    }

    if (!arg_error) {
        argc -= optind;
        argv += optind;
        if (argc >= 1) {
            if (global_commandline_info.cf_name != NULL) {
                /*
                 * Input file name specified with "-r" *and* specified as a regular
                 * command-line argument.
                 */
                cmdarg_err("File name specified both with -r and regular argument");
                arg_error = TRUE;
            } else {
                /*
                 * Input file name not specified with "-r", and a command-line argument
                 * was specified; treat it as the input file name.
                 *
                 * Yes, this is different from tshark, where non-flag command-line
                 * arguments are a filter, but this works better on GUI desktops
                 * where a command can be specified to be run to open a particular
                 * file - yes, you could have "-r" as the last part of the command,
                 * but that's a bit ugly.
                 */
#ifndef HAVE_GTKOSXAPPLICATION
                /*
                 * For GTK+ Mac Integration, file name passed as free argument passed
                 * through grag-and-drop and opened twice sometimes causing crashes.
                 * Subject to report to GTK+ MAC.
                 */
                global_commandline_info.cf_name = g_strdup(argv[0]);
#endif
            }
            argc--;
            argv++;
        }

        if (argc != 0) {
            /*
             * Extra command line arguments were specified; complain.
             */
            cmdarg_err("Invalid argument: %s", argv[0]);
            arg_error = TRUE;
        }
    }

    if (arg_error) {
#ifndef HAVE_LIBPCAP
        if (capture_option_specified) {
            print_no_capture_support_error();
        }
#endif
        commandline_print_usage(FALSE);
        exit(1);
    }

#ifdef HAVE_LIBPCAP
    if (global_commandline_info.start_capture && global_commandline_info.list_link_layer_types) {
        /* Specifying *both* is bogus. */
        cmdarg_err("You can't specify both -L and a live capture.");
        exit(1);
    }

    if (global_commandline_info.list_link_layer_types) {
        /* We're supposed to list the link-layer types for an interface;
           did the user also specify a capture file to be read? */
        if (global_commandline_info.cf_name) {
            /* Yes - that's bogus. */
            cmdarg_err("You can't specify -L and a capture file to be read.");
            exit(1);
        }
        /* No - did they specify a ring buffer option? */
        if (global_capture_opts.multi_files_on) {
            cmdarg_err("Ring buffer requested, but a capture isn't being done.");
            exit(1);
        }
    } else {
        /* We're supposed to do a live capture; did the user also specify
           a capture file to be read? */
        if (global_commandline_info.start_capture && global_commandline_info.cf_name) {
            /* Yes - that's bogus. */
            cmdarg_err("You can't specify both a live capture and a capture file to be read.");
            exit(1);
        }

        /* No - was the ring buffer option specified and, if so, does it make
           sense? */
        if (global_capture_opts.multi_files_on) {
            /* Ring buffer works only under certain conditions:
             a) ring buffer does not work with temporary files;
             b) real_time_mode and multi_files_on are mutually exclusive -
             real_time_mode takes precedence;
             c) it makes no sense to enable the ring buffer if the maximum
             file size is set to "infinite". */
            if (global_capture_opts.save_file == NULL) {
                cmdarg_err("Ring buffer requested, but capture isn't being saved to a permanent file.");
                global_capture_opts.multi_files_on = FALSE;
            }
            if (!global_capture_opts.has_autostop_filesize && !global_capture_opts.has_file_duration) {
                cmdarg_err("Ring buffer requested, but no maximum capture file size or duration were specified.");
                /* XXX - this must be redesigned as the conditions changed */
            }
        }
    }
#endif
}

/*
 * Editor modelines
 *
 * Local Variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * ex: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */