Remove old versions of tcpdump.
[dragonfly.git] / contrib / tcpdump-3.9 / tcpdump.c
1 /*
2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that: (1) source code distributions
7  * retain the above copyright notice and this paragraph in its entirety, (2)
8  * distributions including binary code include the above copyright notice and
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14  * the University nor the names of its contributors may be used to endorse
15  * or promote products derived from this software without specific prior
16  * written permission.
17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20  *
21  * Support for splitting captures into multiple files with a maximum
22  * file size:
23  *
24  * Copyright (c) 2001
25  *      Seth Webster <swebster@sst.ll.mit.edu>
26  */
27
28 #ifndef lint
29 static const char copyright[] _U_ =
30     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
31 The Regents of the University of California.  All rights reserved.\n";
32 static const char rcsid[] _U_ =
33     "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.253.2.13 2007/09/12 19:48:51 guy Exp $ (LBL)";
34 #endif
35
36 /*
37  * tcpdump - monitor tcp/ip traffic on an ethernet.
38  *
39  * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
40  * Mercilessly hacked and occasionally improved since then via the
41  * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
42  */
43
44 #ifdef HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47
48 #include <tcpdump-stdinc.h>
49
50 #ifdef WIN32
51 #include "getopt.h"
52 #include "w32_fzs.h"
53 extern int strcasecmp (const char *__s1, const char *__s2);
54 extern int SIZE_BUF;
55 #define off_t long
56 #define uint UINT
57 #endif /* WIN32 */
58
59 #ifdef HAVE_SMI_H
60 #include <smi.h>
61 #endif
62
63 #include <pcap.h>
64 #include <signal.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #ifndef WIN32
69 #include <pwd.h>
70 #include <grp.h>
71 #include <errno.h>
72 #endif /* WIN32 */
73
74 #include "netdissect.h"
75 #include "interface.h"
76 #include "addrtoname.h"
77 #include "machdep.h"
78 #include "setsignal.h"
79 #include "gmt2local.h"
80 #include "pcap-missing.h"
81
82 netdissect_options Gndo;
83 netdissect_options *gndo = &Gndo;
84
85 /*
86  * Define the maximum number of files for the -C flag, and how many
87  * characters can be added to a filename for the -C flag (which
88  * should be enough to handle MAX_CFLAG - 1).
89  */
90 #define MAX_CFLAG       1000000
91 #define MAX_CFLAG_CHARS 6
92
93 int dflag;                      /* print filter code */
94 int Lflag;                      /* list available data link types and exit */
95
96 static int infodelay;
97 static int infoprint;
98
99 char *program_name;
100
101 int32_t thiszone;               /* seconds offset from gmt to local time */
102
103 /* Forwards */
104 static RETSIGTYPE cleanup(int);
105 static void usage(void) __attribute__((noreturn));
106 static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
107
108 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
109 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
110 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
111 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
112 static void droproot(const char *, const char *);
113 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
114 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
115
116 #ifdef SIGINFO
117 RETSIGTYPE requestinfo(int);
118 #endif
119
120 #if defined(USE_WIN32_MM_TIMER)
121   #include <MMsystem.h>
122   static UINT timer_id;
123   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
124 #elif defined(HAVE_ALARM)
125   static void verbose_stats_dump(int sig);
126 #endif
127
128 static void info(int);
129 static u_int packets_captured;
130
131 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
132
133 struct printer {
134         if_printer f;
135         int type;
136 };
137
138 static struct printer printers[] = {
139         { arcnet_if_print,      DLT_ARCNET },
140 #ifdef DLT_ARCNET_LINUX
141         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
142 #endif
143         { ether_if_print,       DLT_EN10MB },
144         { token_if_print,       DLT_IEEE802 },
145 #ifdef DLT_LANE8023
146         { lane_if_print,        DLT_LANE8023 },
147 #endif
148 #ifdef DLT_CIP
149         { cip_if_print,         DLT_CIP },
150 #endif
151 #ifdef DLT_ATM_CLIP
152         { cip_if_print,         DLT_ATM_CLIP },
153 #endif
154         { sl_if_print,          DLT_SLIP },
155 #ifdef DLT_SLIP_BSDOS
156         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
157 #endif
158         { ppp_if_print,         DLT_PPP },
159 #ifdef DLT_PPP_WITHDIRECTION
160         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
161 #endif
162 #ifdef DLT_PPP_BSDOS
163         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
164 #endif
165         { fddi_if_print,        DLT_FDDI },
166         { null_if_print,        DLT_NULL },
167 #ifdef DLT_LOOP
168         { null_if_print,        DLT_LOOP },
169 #endif
170         { raw_if_print,         DLT_RAW },
171         { atm_if_print,         DLT_ATM_RFC1483 },
172 #ifdef DLT_C_HDLC
173         { chdlc_if_print,       DLT_C_HDLC },
174 #endif
175 #ifdef DLT_HDLC
176         { chdlc_if_print,       DLT_HDLC },
177 #endif
178 #ifdef DLT_PPP_SERIAL
179         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
180 #endif
181 #ifdef DLT_PPP_ETHER
182         { pppoe_if_print,       DLT_PPP_ETHER },
183 #endif
184 #ifdef DLT_LINUX_SLL
185         { sll_if_print,         DLT_LINUX_SLL },
186 #endif
187 #ifdef DLT_IEEE802_11
188         { ieee802_11_if_print,  DLT_IEEE802_11},
189 #endif
190 #ifdef DLT_LTALK
191         { ltalk_if_print,       DLT_LTALK },
192 #endif
193 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
194         { pflog_if_print,       DLT_PFLOG },
195 #endif
196 #ifdef DLT_FR
197         { fr_if_print,          DLT_FR },
198 #endif
199 #ifdef DLT_FRELAY
200         { fr_if_print,          DLT_FRELAY },
201 #endif
202 #ifdef DLT_SUNATM
203         { sunatm_if_print,      DLT_SUNATM },
204 #endif
205 #ifdef DLT_IP_OVER_FC
206         { ipfc_if_print,        DLT_IP_OVER_FC },
207 #endif
208 #ifdef DLT_PRISM_HEADER
209         { prism_if_print,       DLT_PRISM_HEADER },
210 #endif
211 #ifdef DLT_IEEE802_11_RADIO
212         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
213 #endif
214 #ifdef DLT_ENC
215         { enc_if_print,         DLT_ENC },
216 #endif
217 #ifdef DLT_SYMANTEC_FIREWALL
218         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
219 #endif
220 #ifdef DLT_APPLE_IP_OVER_IEEE1394
221         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
222 #endif
223 #ifdef DLT_JUNIPER_ATM1
224         { juniper_atm1_print,   DLT_JUNIPER_ATM1 },
225 #endif
226 #ifdef DLT_JUNIPER_ATM2
227         { juniper_atm2_print,   DLT_JUNIPER_ATM2 },
228 #endif
229 #ifdef DLT_JUNIPER_MFR
230         { juniper_mfr_print,    DLT_JUNIPER_MFR },
231 #endif
232 #ifdef DLT_JUNIPER_MLFR
233         { juniper_mlfr_print,   DLT_JUNIPER_MLFR },
234 #endif
235 #ifdef DLT_JUNIPER_MLPPP
236         { juniper_mlppp_print,  DLT_JUNIPER_MLPPP },
237 #endif
238 #ifdef DLT_JUNIPER_PPPOE
239         { juniper_pppoe_print,  DLT_JUNIPER_PPPOE },
240 #endif
241 #ifdef DLT_JUNIPER_PPPOE_ATM
242         { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
243 #endif
244 #ifdef DLT_JUNIPER_GGSN
245         { juniper_ggsn_print,   DLT_JUNIPER_GGSN },
246 #endif
247 #ifdef DLT_JUNIPER_ES
248         { juniper_es_print,     DLT_JUNIPER_ES },
249 #endif
250 #ifdef DLT_JUNIPER_MONITOR
251         { juniper_monitor_print, DLT_JUNIPER_MONITOR },
252 #endif
253 #ifdef DLT_JUNIPER_SERVICES
254         { juniper_services_print, DLT_JUNIPER_SERVICES },
255 #endif
256 #ifdef DLT_JUNIPER_ETHER
257         { juniper_ether_print, DLT_JUNIPER_ETHER },
258 #endif
259 #ifdef DLT_JUNIPER_PPP
260         { juniper_ppp_print, DLT_JUNIPER_PPP },
261 #endif
262 #ifdef DLT_JUNIPER_FRELAY
263         { juniper_frelay_print, DLT_JUNIPER_FRELAY },
264 #endif
265 #ifdef DLT_JUNIPER_CHDLC
266         { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
267 #endif
268 #ifdef DLT_MFR
269         { mfr_if_print, DLT_MFR },
270 #endif
271         { NULL,                 0 },
272 };
273
274 static if_printer
275 lookup_printer(int type)
276 {
277         struct printer *p;
278
279         for (p = printers; p->f; ++p)
280                 if (type == p->type)
281                         return p->f;
282
283         return NULL;
284         /* NOTREACHED */
285 }
286
287 static pcap_t *pd;
288
289 extern int optind;
290 extern int opterr;
291 extern char *optarg;
292
293 struct print_info {
294         if_printer printer;
295 };
296
297 struct dump_info {
298         char    *WFileName;
299         pcap_t  *pd;
300         pcap_dumper_t *p;
301 };
302
303 static void
304 show_dlts_and_exit(pcap_t *pd)
305 {
306         int n_dlts;
307         int *dlts = 0;
308         const char *dlt_name;
309
310         n_dlts = pcap_list_datalinks(pd, &dlts);
311         if (n_dlts < 0)
312                 error("%s", pcap_geterr(pd));
313         else if (n_dlts == 0 || !dlts)
314                 error("No data link types.");
315
316         (void) fprintf(stderr, "Data link types (use option -y to set):\n");
317
318         while (--n_dlts >= 0) {
319                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
320                 if (dlt_name != NULL) {
321                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
322                             pcap_datalink_val_to_description(dlts[n_dlts]));
323
324                         /*
325                          * OK, does tcpdump handle that type?
326                          */
327                         if (lookup_printer(dlts[n_dlts]) == NULL)
328                                 (void) fprintf(stderr, " (not supported)");
329                         putchar('\n');
330                 } else {
331                         (void) fprintf(stderr, "  DLT %d (not supported)\n",
332                             dlts[n_dlts]);
333                 }
334         }
335         free(dlts);
336         exit(0);
337 }
338
339 /*
340  * Set up flags that might or might not be supported depending on the
341  * version of libpcap we're using.
342  */
343 #ifdef WIN32
344 #define B_FLAG          "B:"
345 #define B_FLAG_USAGE    " [ -B size ]"
346 #else /* WIN32 */
347 #define B_FLAG
348 #define B_FLAG_USAGE
349 #endif /* WIN32 */
350
351 #ifdef HAVE_PCAP_FINDALLDEVS
352 #ifndef HAVE_PCAP_IF_T
353 #undef HAVE_PCAP_FINDALLDEVS
354 #endif
355 #endif
356
357 #ifdef HAVE_PCAP_FINDALLDEVS
358 #define D_FLAG  "D"
359 #else
360 #define D_FLAG
361 #endif
362
363 #ifdef HAVE_PCAP_DUMP_FLUSH
364 #define U_FLAG  "U"
365 #else
366 #define U_FLAG
367 #endif
368
369 #ifndef WIN32
370 /* Drop root privileges and chroot if necessary */
371 static void
372 droproot(const char *username, const char *chroot_dir)
373 {
374         struct passwd *pw = NULL;
375
376         if (chroot_dir && !username) {
377                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
378                 exit(1);
379         }
380         
381         pw = getpwnam(username);
382         if (pw) {
383                 if (chroot_dir) {
384                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
385                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
386                                     chroot_dir, pcap_strerror(errno));
387                                 exit(1);
388                         }
389                 }
390                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
391                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
392                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
393                             username, 
394                             (unsigned long)pw->pw_uid,
395                             (unsigned long)pw->pw_gid,
396                             pcap_strerror(errno));
397                         exit(1);
398                 }
399         }
400         else {
401                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
402                     username);
403                 exit(1);
404         }
405 }
406 #endif /* WIN32 */
407
408 static int
409 getWflagChars(int x)
410 {
411         int c = 0;
412
413         x -= 1;
414         while (x > 0) {
415                 c += 1;
416                 x /= 10;
417         }
418
419         return c;
420 }
421
422
423 static void
424 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
425 {
426         if (cnt == 0 && max_chars == 0)
427                 strcpy(buffer, orig_name);
428         else
429                 sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
430 }
431
432 static int tcpdump_printf(netdissect_options *ndo _U_,
433                           const char *fmt, ...)
434 {
435   
436   va_list args;
437   int ret;
438
439   va_start(args, fmt);
440   ret=vfprintf(stdout, fmt, args);
441   va_end(args);
442
443   return ret;
444 }
445
446 int
447 main(int argc, char **argv)
448 {
449         register int cnt, op, i;
450         bpf_u_int32 localnet, netmask;
451         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
452         pcap_handler callback;
453         int type;
454         struct bpf_program fcode;
455 #ifndef WIN32
456         RETSIGTYPE (*oldhandler)(int);
457 #endif
458         struct print_info printinfo;
459         struct dump_info dumpinfo;
460         u_char *pcap_userdata;
461         char ebuf[PCAP_ERRBUF_SIZE];
462         char *username = NULL;
463         char *chroot_dir = NULL;
464 #ifdef HAVE_PCAP_FINDALLDEVS
465         pcap_if_t *devpointer;
466         int devnum;
467 #endif
468         int status;
469 #ifdef WIN32
470         u_int UserBufferSize = 1000000;
471         if(wsockinit() != 0) return 1;
472 #endif /* WIN32 */
473
474         gndo->ndo_Oflag=1;
475         gndo->ndo_Rflag=1;
476         gndo->ndo_dlt=-1;
477         gndo->ndo_default_print=ndo_default_print;
478         gndo->ndo_printf=tcpdump_printf;
479         gndo->ndo_error=ndo_error;
480         gndo->ndo_warning=ndo_warning;
481         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
482   
483         cnt = -1;
484         device = NULL;
485         infile = NULL;
486         RFileName = NULL;
487         WFileName = NULL;
488         if ((cp = strrchr(argv[0], '/')) != NULL)
489                 program_name = cp + 1;
490         else
491                 program_name = argv[0];
492
493         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
494                 error("%s", ebuf);
495
496 #ifdef LIBSMI
497         smiInit("tcpdump");
498 #endif
499
500         opterr = 0;
501         while (
502             (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:i:lLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1)
503                 switch (op) {
504
505                 case 'a':
506                         /* compatibility for old -a */
507                         break;
508
509                 case 'A':
510                         ++Aflag;
511                         break;
512
513 #ifdef WIN32
514                 case 'B':
515                         UserBufferSize = atoi(optarg)*1024;
516                         if (UserBufferSize < 0)
517                                 error("invalid packet buffer size %s", optarg);
518                         break;
519 #endif /* WIN32 */
520
521                 case 'c':
522                         cnt = atoi(optarg);
523                         if (cnt <= 0)
524                                 error("invalid packet count %s", optarg);
525                         break;
526
527                 case 'C':
528                         Cflag = atoi(optarg) * 1000000;
529                         if (Cflag < 0)
530                                 error("invalid file size %s", optarg);
531                         break;
532
533                 case 'd':
534                         ++dflag;
535                         break;
536
537 #ifdef HAVE_PCAP_FINDALLDEVS
538                 case 'D':
539                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
540                                 error("%s", ebuf);
541                         else {
542                                 for (i = 0; devpointer != 0; i++) {
543                                         printf("%d.%s", i+1, devpointer->name);
544                                         if (devpointer->description != NULL)
545                                                 printf(" (%s)", devpointer->description);
546                                         printf("\n");
547                                         devpointer = devpointer->next;
548                                 }
549                         }
550                         return 0;
551 #endif /* HAVE_PCAP_FINDALLDEVS */
552
553                 case 'L':
554                         Lflag++;
555                         break;
556
557                 case 'e':
558                         ++eflag;
559                         break;
560
561                 case 'E':
562 #ifndef HAVE_LIBCRYPTO
563                         warning("crypto code not compiled in");
564 #endif
565                         gndo->ndo_espsecret = optarg;
566                         break;
567
568                 case 'f':
569                         ++fflag;
570                         break;
571
572                 case 'F':
573                         infile = optarg;
574                         break;
575
576                 case 'i':
577                         if (optarg[0] == '0' && optarg[1] == 0)
578                                 error("Invalid adapter index");
579                         
580 #ifdef HAVE_PCAP_FINDALLDEVS
581                         /*
582                          * If the argument is a number, treat it as
583                          * an index into the list of adapters, as
584                          * printed by "tcpdump -D".
585                          *
586                          * This should be OK on UNIX systems, as interfaces
587                          * shouldn't have names that begin with digits.
588                          * It can be useful on Windows, where more than
589                          * one interface can have the same name.
590                          */
591                         if ((devnum = atoi(optarg)) != 0) {
592                                 if (devnum < 0)
593                                         error("Invalid adapter index");
594
595                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
596                                         error("%s", ebuf);
597                                 else {
598                                         for (i = 0; i < devnum-1; i++){
599                                                 devpointer = devpointer->next;
600                                                 if (devpointer == NULL)
601                                                         error("Invalid adapter index");
602                                         }
603                                 }
604                                 device = devpointer->name;
605                                 break;
606                         }
607 #endif /* HAVE_PCAP_FINDALLDEVS */
608                         device = optarg;
609                         break;
610
611                 case 'l':
612 #ifdef WIN32
613                         /*
614                          * _IOLBF is the same as _IOFBF in Microsoft's C
615                          * libraries; the only alternative they offer
616                          * is _IONBF.
617                          *
618                          * XXX - this should really be checking for MSVC++,
619                          * not WIN32, if, for example, MinGW has its own
620                          * C library that is more UNIX-compatible.
621                          */
622                         setvbuf(stdout, NULL, _IONBF, 0);
623 #else /* WIN32 */
624 #ifdef HAVE_SETLINEBUF
625                         setlinebuf(stdout);
626 #else
627                         setvbuf(stdout, NULL, _IOLBF, 0);
628 #endif
629 #endif /* WIN32 */
630                         break;
631
632                 case 'n':
633                         ++nflag;
634                         break;
635
636                 case 'N':
637                         ++Nflag;
638                         break;
639
640                 case 'm':
641 #ifdef LIBSMI
642                         if (smiLoadModule(optarg) == 0) {
643                                 error("could not load MIB module %s", optarg);
644                         }
645                         sflag = 1;
646 #else
647                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
648                                       program_name, optarg);
649                         (void)fprintf(stderr, "(no libsmi support)\n");
650 #endif
651                         break;
652
653                 case 'M':
654                         /* TCP-MD5 shared secret */
655 #ifndef HAVE_LIBCRYPTO
656                         warning("crypto code not compiled in");
657 #endif
658                         tcpmd5secret = optarg;
659                         break;
660
661                 case 'O':
662                         Oflag = 0;
663                         break;
664
665                 case 'p':
666                         ++pflag;
667                         break;
668
669                 case 'q':
670                         ++qflag;
671                         ++suppress_default_print;
672                         break;
673
674                 case 'r':
675                         RFileName = optarg;
676                         break;
677
678                 case 'R':
679                         Rflag = 0;
680                         break;
681
682                 case 's': {
683                         char *end;
684
685                         snaplen = strtol(optarg, &end, 0);
686                         if (optarg == end || *end != '\0'
687                             || snaplen < 0 || snaplen > 65535)
688                                 error("invalid snaplen %s", optarg);
689                         else if (snaplen == 0)
690                                 snaplen = 65535;
691                         break;
692                 }
693
694                 case 'S':
695                         ++Sflag;
696                         break;
697
698                 case 't':
699                         ++tflag;
700                         break;
701
702                 case 'T':
703                         if (strcasecmp(optarg, "vat") == 0)
704                                 packettype = PT_VAT;
705                         else if (strcasecmp(optarg, "wb") == 0)
706                                 packettype = PT_WB;
707                         else if (strcasecmp(optarg, "rpc") == 0)
708                                 packettype = PT_RPC;
709                         else if (strcasecmp(optarg, "rtp") == 0)
710                                 packettype = PT_RTP;
711                         else if (strcasecmp(optarg, "rtcp") == 0)
712                                 packettype = PT_RTCP;
713                         else if (strcasecmp(optarg, "snmp") == 0)
714                                 packettype = PT_SNMP;
715                         else if (strcasecmp(optarg, "cnfp") == 0)
716                                 packettype = PT_CNFP;
717                         else if (strcasecmp(optarg, "tftp") == 0)
718                                 packettype = PT_TFTP;
719                         else if (strcasecmp(optarg, "aodv") == 0)
720                                 packettype = PT_AODV;
721                         else
722                                 error("unknown packet type `%s'", optarg);
723                         break;
724
725                 case 'u':
726                         ++uflag;
727                         break;
728
729 #ifdef HAVE_PCAP_DUMP_FLUSH
730                 case 'U':
731                         ++Uflag;
732                         break;
733 #endif
734
735                 case 'v':
736                         ++vflag;
737                         break;
738
739                 case 'w':
740                         WFileName = optarg;
741                         break;
742
743                 case 'W':
744                         Wflag = atoi(optarg);
745                         if (Wflag < 0) 
746                                 error("invalid number of output files %s", optarg);
747                         WflagChars = getWflagChars(Wflag);
748                         break;
749
750                 case 'x':
751                         ++xflag;
752                         ++suppress_default_print;
753                         break;
754
755                 case 'X':
756                         ++Xflag;
757                         ++suppress_default_print;
758                         break;
759
760                 case 'y':
761                         gndo->ndo_dltname = optarg;
762                         gndo->ndo_dlt =
763                           pcap_datalink_name_to_val(gndo->ndo_dltname);
764                         if (gndo->ndo_dlt < 0)
765                                 error("invalid data link type %s", gndo->ndo_dltname);
766                         break;
767
768 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
769                 case 'Y':
770                         {
771                         /* Undocumented flag */
772 #ifdef HAVE_PCAP_DEBUG
773                         extern int pcap_debug;
774                         pcap_debug = 1;
775 #else
776                         extern int yydebug;
777                         yydebug = 1;
778 #endif
779                         }
780                         break;
781 #endif
782                 case 'Z':
783                         if (optarg) {
784                                 username = strdup(optarg);
785                         }
786                         else {
787                                 usage();
788                                 /* NOTREACHED */
789                         }
790                         break;
791
792                 default:
793                         usage();
794                         /* NOTREACHED */
795                 }
796
797         switch (tflag) {
798
799         case 0: /* Default */
800         case 4: /* Default + Date*/
801                 thiszone = gmt2local(0);
802                 break;
803
804         case 1: /* No time stamp */
805         case 2: /* Unix timeval style */
806         case 3: /* Microseconds since previous packet */
807                 break;
808
809         default: /* Not supported */
810                 error("only -t, -tt, -ttt, and -tttt are supported");
811                 break;
812         }
813
814 #ifdef WITH_CHROOT
815         /* if run as root, prepare for chrooting */
816         if (getuid() == 0 || geteuid() == 0) {
817                 /* future extensibility for cmd-line arguments */
818                 if (!chroot_dir)
819                         chroot_dir = WITH_CHROOT;
820         }
821 #endif
822
823 #ifdef WITH_USER
824         /* if run as root, prepare for dropping root privileges */
825         if (getuid() == 0 || geteuid() == 0) {
826                 /* Run with '-Z root' to restore old behaviour */ 
827                 if (!username)
828                         username = WITH_USER;
829         }
830 #endif
831
832         if (RFileName != NULL) {
833                 int dlt;
834                 const char *dlt_name;
835
836 #ifndef WIN32
837                 /*
838                  * We don't need network access, so relinquish any set-UID
839                  * or set-GID privileges we have (if any).
840                  *
841                  * We do *not* want set-UID privileges when opening a
842                  * trace file, as that might let the user read other
843                  * people's trace files (especially if we're set-UID
844                  * root).
845                  */
846                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
847                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
848 #endif /* WIN32 */
849                 pd = pcap_open_offline(RFileName, ebuf);
850                 if (pd == NULL)
851                         error("%s", ebuf);
852                 dlt = pcap_datalink(pd);
853                 dlt_name = pcap_datalink_val_to_name(dlt);
854                 if (dlt_name == NULL) {
855                         fprintf(stderr, "reading from file %s, link-type %u\n",
856                             RFileName, dlt);
857                 } else {
858                         fprintf(stderr,
859                             "reading from file %s, link-type %s (%s)\n",
860                             RFileName, dlt_name,
861                             pcap_datalink_val_to_description(dlt));
862                 }
863                 localnet = 0;
864                 netmask = 0;
865                 if (fflag != 0)
866                         error("-f and -r options are incompatible");
867         } else {
868                 if (device == NULL) {
869                         device = pcap_lookupdev(ebuf);
870                         if (device == NULL)
871                                 error("%s", ebuf);
872                 }
873 #ifdef WIN32
874                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
875                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
876                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
877                 }
878                 else
879                 {
880                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
881                 }
882
883                 fflush(stderr); 
884 #endif /* WIN32 */
885                 *ebuf = '\0';
886                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
887                 if (pd == NULL)
888                         error("%s", ebuf);
889                 else if (*ebuf)
890                         warning("%s", ebuf);
891                 /*
892                  * Let user own process after socket has been opened.
893                  */
894 #ifndef WIN32
895                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
896                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
897 #endif /* WIN32 */
898 #ifdef WIN32
899                 if(UserBufferSize != 1000000)
900                         if(pcap_setbuff(pd, UserBufferSize)==-1){
901                                 error("%s", pcap_geterr(pd));
902                         }
903 #endif /* WIN32 */
904                 if (Lflag)
905                         show_dlts_and_exit(pd);
906                 if (gndo->ndo_dlt >= 0) {
907 #ifdef HAVE_PCAP_SET_DATALINK
908                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
909                                 error("%s", pcap_geterr(pd));
910 #else
911                         /*
912                          * We don't actually support changing the
913                          * data link type, so we only let them
914                          * set it to what it already is.
915                          */
916                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
917                                 error("%s is not one of the DLTs supported by this device\n",
918                                       gndo->ndo_dltname);
919                         }
920 #endif
921                         (void)fprintf(stderr, "%s: data link type %s\n",
922                                       program_name, gndo->ndo_dltname);
923                         (void)fflush(stderr);
924                 }
925                 i = pcap_snapshot(pd);
926                 if (snaplen < i) {
927                         warning("snaplen raised from %d to %d", snaplen, i);
928                         snaplen = i;
929                 }
930                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
931                         localnet = 0;
932                         netmask = 0;
933                         warning("%s", ebuf);
934                 }
935         }
936         if (infile)
937                 cmdbuf = read_infile(infile);
938         else
939                 cmdbuf = copy_argv(&argv[optind]);
940
941         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
942                 error("%s", pcap_geterr(pd));
943         if (dflag) {
944                 bpf_dump(&fcode, dflag);
945                 pcap_close(pd);
946                 exit(0);
947         }
948         init_addrtoname(localnet, netmask);
949
950 #ifndef WIN32   
951         (void)setsignal(SIGPIPE, cleanup);
952 #endif /* WIN32 */
953         (void)setsignal(SIGTERM, cleanup);
954         (void)setsignal(SIGINT, cleanup);
955         /* Cooperate with nohup(1) */
956 #ifndef WIN32   
957         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
958                 (void)setsignal(SIGHUP, oldhandler);
959 #endif /* WIN32 */
960
961         if (pcap_setfilter(pd, &fcode) < 0)
962                 error("%s", pcap_geterr(pd));
963         if (WFileName) {
964                 pcap_dumper_t *p;
965
966                 WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
967                 if (WFileNameAlt == NULL)
968                         error("malloc of WFileNameAlt");
969                 MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
970                 p = pcap_dump_open(pd, WFileNameAlt);
971                 if (p == NULL)
972                         error("%s", pcap_geterr(pd));
973                 if (Cflag != 0) {
974                         callback = dump_packet_and_trunc;
975                         dumpinfo.WFileName = WFileName;
976                         dumpinfo.pd = pd;
977                         dumpinfo.p = p;
978                         pcap_userdata = (u_char *)&dumpinfo;
979                 } else {
980                         callback = dump_packet;
981                         pcap_userdata = (u_char *)p;
982                 }
983         } else {
984                 type = pcap_datalink(pd);
985                 printinfo.printer = lookup_printer(type);
986                 if (printinfo.printer == NULL) {
987                         gndo->ndo_dltname = pcap_datalink_val_to_name(type);
988                         if (gndo->ndo_dltname != NULL)
989                                 error("unsupported data link type %s",
990                                       gndo->ndo_dltname);
991                         else
992                                 error("unsupported data link type %d", type);
993                 }
994                 callback = print_packet;
995                 pcap_userdata = (u_char *)&printinfo;
996         }
997 #ifndef WIN32
998         /*
999          * We cannot do this earlier, because we want to be able to open
1000          * the file (if done) for writing before giving up permissions.
1001          */
1002         if (getuid() == 0 || geteuid() == 0) {
1003                 if (username || chroot_dir)
1004                         droproot(username, chroot_dir);
1005         }
1006 #endif /* WIN32 */
1007 #ifdef SIGINFO
1008         (void)setsignal(SIGINFO, requestinfo);
1009 #endif
1010
1011         if (vflag > 0 && WFileName) {
1012                 /*
1013                  * When capturing to a file, "-v" means tcpdump should,
1014                  * every 10 secodns, "v"erbosely report the number of
1015                  * packets captured.
1016                  */
1017 #ifdef USE_WIN32_MM_TIMER
1018                 /* call verbose_stats_dump() each 1000 +/-100msec */
1019                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1020                 setvbuf(stderr, NULL, _IONBF, 0);
1021 #elif defined(HAVE_ALARM)
1022                 (void)setsignal(SIGALRM, verbose_stats_dump);
1023                 alarm(1);
1024 #endif
1025         }
1026
1027 #ifndef WIN32
1028         if (RFileName == NULL) {
1029                 int dlt;
1030                 const char *dlt_name;
1031
1032                 if (!vflag && !WFileName) {
1033                         (void)fprintf(stderr,
1034                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1035                             program_name);
1036                 } else
1037                         (void)fprintf(stderr, "%s: ", program_name);
1038                 dlt = pcap_datalink(pd);
1039                 dlt_name = pcap_datalink_val_to_name(dlt);
1040                 if (dlt_name == NULL) {
1041                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1042                             device, dlt, snaplen);
1043                 } else {
1044                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1045                             device, dlt_name,
1046                             pcap_datalink_val_to_description(dlt), snaplen);
1047                 }
1048                 (void)fflush(stderr);
1049         }
1050 #endif /* WIN32 */
1051         status = pcap_loop(pd, cnt, callback, pcap_userdata);
1052         if (WFileName == NULL) {
1053                 /*
1054                  * We're printing packets.  Flush the printed output,
1055                  * so it doesn't get intermingled with error output.
1056                  */
1057                 if (status == -2) {
1058                         /*
1059                          * We got interrupted, so perhaps we didn't
1060                          * manage to finish a line we were printing.
1061                          * Print an extra newline, just in case.
1062                          */
1063                         putchar('\n');
1064                 }
1065                 (void)fflush(stdout);
1066         }
1067         if (status == -1) {
1068                 /*
1069                  * Error.  Report it.
1070                  */
1071                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1072                     program_name, pcap_geterr(pd));
1073         }
1074         if (RFileName == NULL) {
1075                 /*
1076                  * We're doing a live capture.  Report the capture
1077                  * statistics.
1078                  */
1079                 info(1);
1080         }
1081         pcap_close(pd);
1082         exit(status == -1 ? 1 : 0);
1083 }
1084
1085 /* make a clean exit on interrupts */
1086 static RETSIGTYPE
1087 cleanup(int signo _U_)
1088 {
1089 #ifdef USE_WIN32_MM_TIMER
1090         if (timer_id)
1091                 timeKillEvent(timer_id);
1092         timer_id = 0;
1093 #elif defined(HAVE_ALARM)
1094         alarm(0);
1095 #endif
1096
1097 #ifdef HAVE_PCAP_BREAKLOOP
1098         /*
1099          * We have "pcap_breakloop()"; use it, so that we do as little
1100          * as possible in the signal handler (it's probably not safe
1101          * to do anything with standard I/O streams in a signal handler -
1102          * the ANSI C standard doesn't say it is).
1103          */
1104         pcap_breakloop(pd);
1105 #else
1106         /*
1107          * We don't have "pcap_breakloop()"; this isn't safe, but
1108          * it's the best we can do.  Print the summary if we're
1109          * not reading from a savefile - i.e., if we're doing a
1110          * live capture - and exit.
1111          */
1112         if (pd != NULL && pcap_file(pd) == NULL) {
1113                 /*
1114                  * We got interrupted, so perhaps we didn't
1115                  * manage to finish a line we were printing.
1116                  * Print an extra newline, just in case.
1117                  */
1118                 putchar('\n');
1119                 (void)fflush(stdout);
1120                 info(1);
1121         }
1122         exit(0);
1123 #endif
1124 }
1125
1126 static void
1127 info(register int verbose)
1128 {
1129         struct pcap_stat stat;
1130
1131         if (pcap_stats(pd, &stat) < 0) {
1132                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1133                 return;
1134         }
1135
1136         if (!verbose)
1137                 fprintf(stderr, "%s: ", program_name);
1138
1139         (void)fprintf(stderr, "%u packets captured", packets_captured);
1140         if (!verbose)
1141                 fputs(", ", stderr);
1142         else
1143                 putc('\n', stderr);
1144         (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1145         if (!verbose)
1146                 fputs(", ", stderr);
1147         else
1148                 putc('\n', stderr);
1149         (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1150         infoprint = 0;
1151 }
1152
1153 static void
1154 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1155 {
1156         struct dump_info *dump_info;
1157         char *name;
1158
1159         ++packets_captured;
1160
1161         ++infodelay;
1162
1163         dump_info = (struct dump_info *)user;
1164
1165         /*
1166          * XXX - this won't prevent capture files from getting
1167          * larger than Cflag - the last packet written to the
1168          * file could put it over Cflag.
1169          */
1170         if (pcap_dump_ftell(dump_info->p) > Cflag) {
1171                 /*
1172                  * Close the current file and open a new one.
1173                  */
1174                 pcap_dump_close(dump_info->p);
1175                 Cflag_count++;
1176                 if (Wflag > 0) {
1177                         if (Cflag_count >= Wflag)
1178                                 Cflag_count = 0;
1179                 } else {
1180                         if (Cflag_count >= MAX_CFLAG)
1181                                 error("too many output files");
1182                 }
1183                 name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);
1184                 if (name == NULL)
1185                         error("dump_packet_and_trunc: malloc");
1186                 MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1187                 dump_info->p = pcap_dump_open(dump_info->pd, name);
1188                 free(name);
1189                 if (dump_info->p == NULL)
1190                         error("%s", pcap_geterr(pd));
1191         }
1192
1193         pcap_dump((u_char *)dump_info->p, h, sp);
1194 #ifdef HAVE_PCAP_DUMP_FLUSH
1195         if (Uflag)
1196                 pcap_dump_flush(dump_info->p);
1197 #endif
1198
1199         --infodelay;
1200         if (infoprint)
1201                 info(0);
1202 }
1203
1204 static void
1205 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1206 {
1207         ++packets_captured;
1208
1209         ++infodelay;
1210
1211         pcap_dump(user, h, sp);
1212 #ifdef HAVE_PCAP_DUMP_FLUSH
1213         if (Uflag)
1214                 pcap_dump_flush((pcap_dumper_t *)user);
1215 #endif
1216
1217         --infodelay;
1218         if (infoprint)
1219                 info(0);
1220 }
1221
1222 static void
1223 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1224 {
1225         struct print_info *print_info;
1226         u_int hdrlen;
1227
1228         ++packets_captured;
1229
1230         ++infodelay;
1231         ts_print(&h->ts);
1232
1233         print_info = (struct print_info *)user;
1234
1235         /*
1236          * Some printers want to check that they're not walking off the
1237          * end of the packet.
1238          * Rather than pass it all the way down, we set this global.
1239          */
1240         snapend = sp + h->caplen;
1241
1242         hdrlen = (*print_info->printer)(h, sp);
1243         if (Xflag) {
1244                 /*
1245                  * Print the raw packet data in hex and ASCII.
1246                  */
1247                 if (Xflag > 1) {
1248                         /*
1249                          * Include the link-layer header.
1250                          */
1251                         hex_and_ascii_print("\n\t", sp, h->caplen);
1252                 } else {
1253                         /*
1254                          * Don't include the link-layer header - and if
1255                          * we have nothing past the link-layer header,
1256                          * print nothing.
1257                          */
1258                         if (h->caplen > hdrlen)
1259                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1260                                     h->caplen - hdrlen);
1261                 }
1262         } else if (xflag) {
1263                 /*
1264                  * Print the raw packet data in hex.
1265                  */
1266                 if (xflag > 1) {
1267                         /*
1268                          * Include the link-layer header.
1269                          */
1270                         hex_print("\n\t", sp, h->caplen);
1271                 } else {
1272                         /*
1273                          * Don't include the link-layer header - and if
1274                          * we have nothing past the link-layer header,
1275                          * print nothing.
1276                          */
1277                         if (h->caplen > hdrlen)
1278                                 hex_print("\n\t", sp + hdrlen,
1279                                     h->caplen - hdrlen);
1280                 }
1281         } else if (Aflag) {
1282                 /*
1283                  * Print the raw packet data in ASCII.
1284                  */
1285                 if (Aflag > 1) {
1286                         /*
1287                          * Include the link-layer header.
1288                          */
1289                         ascii_print(sp, h->caplen);
1290                 } else {
1291                         /*
1292                          * Don't include the link-layer header - and if
1293                          * we have nothing past the link-layer header,
1294                          * print nothing.
1295                          */
1296                         if (h->caplen > hdrlen)
1297                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1298                 }
1299         }
1300
1301         putchar('\n');
1302
1303         --infodelay;
1304         if (infoprint)
1305                 info(0);
1306 }
1307
1308 #ifdef WIN32
1309         /*
1310          * XXX - there should really be libpcap calls to get the version
1311          * number as a string (the string would be generated from #defines
1312          * at run time, so that it's not generated from string constants
1313          * in the library, as, on many UNIX systems, those constants would
1314          * be statically linked into the application executable image, and
1315          * would thus reflect the version of libpcap on the system on
1316          * which the application was *linked*, not the system on which it's
1317          * *running*.
1318          *
1319          * That routine should be documented, unlike the "version[]"
1320          * string, so that UNIX vendors providing their own libpcaps
1321          * don't omit it (as a couple of vendors have...).
1322          *
1323          * Packet.dll should perhaps also export a routine to return the
1324          * version number of the Packet.dll code, to supply the
1325          * "Wpcap_version" information on Windows.
1326          */
1327         char WDversion[]="current-cvs.tcpdump.org";
1328 #if !defined(HAVE_GENERATED_VERSION)
1329         char version[]="current-cvs.tcpdump.org";
1330 #endif
1331         char pcap_version[]="current-cvs.tcpdump.org";
1332         char Wpcap_version[]="3.1";
1333 #endif
1334
1335 /*
1336  * By default, print the specified data out in hex and ASCII.
1337  */
1338 static void
1339 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1340 {
1341         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1342 }
1343
1344 void
1345 default_print(const u_char *bp, u_int length)
1346 {
1347         ndo_default_print(gndo, bp, length);
1348 }
1349
1350 #ifdef SIGINFO
1351 RETSIGTYPE requestinfo(int signo _U_)
1352 {
1353         if (infodelay)
1354                 ++infoprint;
1355         else
1356                 info(0);
1357 }
1358 #endif
1359
1360 /*
1361  * Called once each second in verbose mode while dumping to file
1362  */
1363 #ifdef USE_WIN32_MM_TIMER
1364 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1365                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1366 {
1367         struct pcap_stat stat;
1368
1369         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1370                 fprintf(stderr, "Got %u\r", packets_captured);
1371 }
1372 #elif defined(HAVE_ALARM)
1373 static void verbose_stats_dump(int sig _U_)
1374 {
1375         struct pcap_stat stat;
1376
1377         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1378                 fprintf(stderr, "Got %u\r", packets_captured);
1379         alarm(1);
1380 }
1381 #endif
1382
1383 static void
1384 usage(void)
1385 {
1386         extern char version[];
1387 #ifndef HAVE_PCAP_LIB_VERSION
1388 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1389         extern char pcap_version[];
1390 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1391         static char pcap_version[] = "unknown";
1392 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1393 #endif /* HAVE_PCAP_LIB_VERSION */
1394
1395 #ifdef HAVE_PCAP_LIB_VERSION
1396 #ifdef WIN32
1397         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1398 #else /* WIN32 */
1399         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1400 #endif /* WIN32 */
1401         (void)fprintf(stderr, "%s\n",pcap_lib_version());
1402 #else /* HAVE_PCAP_LIB_VERSION */
1403 #ifdef WIN32
1404         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1405         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1406 #else /* WIN32 */
1407         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1408         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1409 #endif /* WIN32 */
1410 #endif /* HAVE_PCAP_LIB_VERSION */
1411         (void)fprintf(stderr,
1412 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1413         (void)fprintf(stderr,
1414 "\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n");
1415         (void)fprintf(stderr,
1416 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1417         (void)fprintf(stderr,
1418 "\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1419         (void)fprintf(stderr,
1420 "\t\t[ expression ]\n");
1421         exit(1);
1422 }
1423
1424
1425
1426 /* VARARGS */
1427 static void
1428 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1429 {
1430         va_list ap;
1431
1432         (void)fprintf(stderr, "%s: ", program_name);
1433         va_start(ap, fmt);
1434         (void)vfprintf(stderr, fmt, ap);
1435         va_end(ap);
1436         if (*fmt) {
1437                 fmt += strlen(fmt);
1438                 if (fmt[-1] != '\n')
1439                         (void)fputc('\n', stderr);
1440         }
1441         exit(1);
1442         /* NOTREACHED */
1443 }
1444
1445 /* VARARGS */
1446 static void
1447 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1448 {
1449         va_list ap;
1450
1451         (void)fprintf(stderr, "%s: WARNING: ", program_name);
1452         va_start(ap, fmt);
1453         (void)vfprintf(stderr, fmt, ap);
1454         va_end(ap);
1455         if (*fmt) {
1456                 fmt += strlen(fmt);
1457                 if (fmt[-1] != '\n')
1458                         (void)fputc('\n', stderr);
1459         }
1460 }
1461