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Have print_llc() clear out the extracted_ethertype argument, rather than
[tcpdump] / 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 1.263 2005-10-25 09:29:44 hannes 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 #ifndef NAME_MAX
83 #define NAME_MAX 255
84 #endif
85
86 netdissect_options Gndo;
87 netdissect_options *gndo = &Gndo;
88
89 int dflag; /* print filter code */
90 int Lflag; /* list available data link types and exit */
91
92 static int infodelay;
93 static int infoprint;
94
95 char *program_name;
96
97 int32_t thiszone; /* seconds offset from gmt to local time */
98
99 /* Forwards */
100 static RETSIGTYPE cleanup(int);
101 static void usage(void) __attribute__((noreturn));
102 static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
103
104 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
105 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
106 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
107 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
108 static void droproot(const char *, const char *);
109 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
110 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
111
112 #ifdef SIGINFO
113 RETSIGTYPE requestinfo(int);
114 #endif
115
116 #if defined(USE_WIN32_MM_TIMER)
117 #include <MMsystem.h>
118 static UINT timer_id;
119 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
120 #elif defined(HAVE_ALARM)
121 static void verbose_stats_dump(int sig);
122 #endif
123
124 static void info(int);
125 static u_int packets_captured;
126
127 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
128
129 struct printer {
130 if_printer f;
131 int type;
132 };
133
134 static struct printer printers[] = {
135 { arcnet_if_print, DLT_ARCNET },
136 #ifdef DLT_ARCNET_LINUX
137 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
138 #endif
139 { ether_if_print, DLT_EN10MB },
140 { token_if_print, DLT_IEEE802 },
141 #ifdef DLT_LANE8023
142 { lane_if_print, DLT_LANE8023 },
143 #endif
144 #ifdef DLT_CIP
145 { cip_if_print, DLT_CIP },
146 #endif
147 #ifdef DLT_ATM_CLIP
148 { cip_if_print, DLT_ATM_CLIP },
149 #endif
150 { sl_if_print, DLT_SLIP },
151 #ifdef DLT_SLIP_BSDOS
152 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
153 #endif
154 { ppp_if_print, DLT_PPP },
155 #ifdef DLT_PPP_WITHDIRECTION
156 { ppp_if_print, DLT_PPP_WITHDIRECTION },
157 #endif
158 #ifdef DLT_PPP_BSDOS
159 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
160 #endif
161 { fddi_if_print, DLT_FDDI },
162 { null_if_print, DLT_NULL },
163 #ifdef DLT_LOOP
164 { null_if_print, DLT_LOOP },
165 #endif
166 { raw_if_print, DLT_RAW },
167 { atm_if_print, DLT_ATM_RFC1483 },
168 #ifdef DLT_C_HDLC
169 { chdlc_if_print, DLT_C_HDLC },
170 #endif
171 #ifdef DLT_HDLC
172 { chdlc_if_print, DLT_HDLC },
173 #endif
174 #ifdef DLT_PPP_SERIAL
175 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
176 #endif
177 #ifdef DLT_PPP_ETHER
178 { pppoe_if_print, DLT_PPP_ETHER },
179 #endif
180 #ifdef DLT_LINUX_SLL
181 { sll_if_print, DLT_LINUX_SLL },
182 #endif
183 #ifdef DLT_IEEE802_11
184 { ieee802_11_if_print, DLT_IEEE802_11},
185 #endif
186 #ifdef DLT_LTALK
187 { ltalk_if_print, DLT_LTALK },
188 #endif
189 #ifdef DLT_PFLOG
190 { pflog_if_print, DLT_PFLOG },
191 #endif
192 #ifdef DLT_FR
193 { fr_if_print, DLT_FR },
194 #endif
195 #ifdef DLT_FRELAY
196 { fr_if_print, DLT_FRELAY },
197 #endif
198 #ifdef DLT_SUNATM
199 { sunatm_if_print, DLT_SUNATM },
200 #endif
201 #ifdef DLT_IP_OVER_FC
202 { ipfc_if_print, DLT_IP_OVER_FC },
203 #endif
204 #ifdef DLT_PRISM_HEADER
205 { prism_if_print, DLT_PRISM_HEADER },
206 #endif
207 #ifdef DLT_IEEE802_11_RADIO
208 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
209 #endif
210 #ifdef DLT_ENC
211 { enc_if_print, DLT_ENC },
212 #endif
213 #ifdef DLT_SYMANTEC_FIREWALL
214 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
215 #endif
216 #ifdef DLT_APPLE_IP_OVER_IEEE1394
217 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
218 #endif
219 #ifdef DLT_JUNIPER_ATM1
220 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
221 #endif
222 #ifdef DLT_JUNIPER_ATM2
223 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
224 #endif
225 #ifdef DLT_JUNIPER_MFR
226 { juniper_mfr_print, DLT_JUNIPER_MFR },
227 #endif
228 #ifdef DLT_JUNIPER_MLFR
229 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
230 #endif
231 #ifdef DLT_JUNIPER_MLPPP
232 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
233 #endif
234 #ifdef DLT_JUNIPER_PPPOE
235 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
236 #endif
237 #ifdef DLT_JUNIPER_PPPOE_ATM
238 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
239 #endif
240 #ifdef DLT_JUNIPER_GGSN
241 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
242 #endif
243 #ifdef DLT_JUNIPER_ES
244 { juniper_es_print, DLT_JUNIPER_ES },
245 #endif
246 #ifdef DLT_JUNIPER_MONITOR
247 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
248 #endif
249 #ifdef DLT_JUNIPER_SERVICES
250 { juniper_services_print, DLT_JUNIPER_SERVICES },
251 #endif
252 #ifdef DLT_JUNIPER_ETHER
253 { juniper_ether_print, DLT_JUNIPER_ETHER },
254 #endif
255 #ifdef DLT_JUNIPER_PPP
256 { juniper_ppp_print, DLT_JUNIPER_PPP },
257 #endif
258 #ifdef DLT_JUNIPER_FRELAY
259 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
260 #endif
261 #ifdef DLT_JUNIPER_CHDLC
262 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
263 #endif
264 { NULL, 0 },
265 };
266
267 static if_printer
268 lookup_printer(int type)
269 {
270 struct printer *p;
271
272 for (p = printers; p->f; ++p)
273 if (type == p->type)
274 return p->f;
275
276 return NULL;
277 /* NOTREACHED */
278 }
279
280 static pcap_t *pd;
281
282 extern int optind;
283 extern int opterr;
284 extern char *optarg;
285
286 struct print_info {
287 if_printer printer;
288 };
289
290 struct dump_info {
291 char *WFileName;
292 pcap_t *pd;
293 pcap_dumper_t *p;
294 };
295
296 static void
297 show_dlts_and_exit(pcap_t *pd)
298 {
299 int n_dlts;
300 int *dlts = 0;
301 const char *dlt_name;
302
303 n_dlts = pcap_list_datalinks(pd, &dlts);
304 if (n_dlts < 0)
305 error("%s", pcap_geterr(pd));
306 else if (n_dlts == 0 || !dlts)
307 error("No data link types.");
308
309 (void) fprintf(stderr, "Data link types (use option -y to set):\n");
310
311 while (--n_dlts >= 0) {
312 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
313 if (dlt_name != NULL) {
314 (void) fprintf(stderr, " %s (%s)", dlt_name,
315 pcap_datalink_val_to_description(dlts[n_dlts]));
316
317 /*
318 * OK, does tcpdump handle that type?
319 */
320 if (lookup_printer(dlts[n_dlts]) == NULL)
321 (void) fprintf(stderr, " (not supported)");
322 putchar('\n');
323 } else {
324 (void) fprintf(stderr, " DLT %d (not supported)\n",
325 dlts[n_dlts]);
326 }
327 }
328 free(dlts);
329 exit(0);
330 }
331
332 /*
333 * Set up flags that might or might not be supported depending on the
334 * version of libpcap we're using.
335 */
336 #ifdef WIN32
337 #define B_FLAG "B:"
338 #define B_FLAG_USAGE " [ -B size ]"
339 #else /* WIN32 */
340 #define B_FLAG
341 #define B_FLAG_USAGE
342 #endif /* WIN32 */
343
344 #ifdef HAVE_PCAP_FINDALLDEVS
345 #ifndef HAVE_PCAP_IF_T
346 #undef HAVE_PCAP_FINDALLDEVS
347 #endif
348 #endif
349
350 #ifdef HAVE_PCAP_FINDALLDEVS
351 #define D_FLAG "D"
352 #else
353 #define D_FLAG
354 #endif
355
356 #ifdef HAVE_PCAP_DUMP_FLUSH
357 #define U_FLAG "U"
358 #else
359 #define U_FLAG
360 #endif
361
362 #ifndef WIN32
363 /* Drop root privileges and chroot if necessary */
364 static void
365 droproot(const char *username, const char *chroot_dir)
366 {
367 struct passwd *pw = NULL;
368
369 if (chroot_dir && !username) {
370 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
371 exit(1);
372 }
373
374 pw = getpwnam(username);
375 if (pw) {
376 if (chroot_dir) {
377 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
378 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
379 chroot_dir, pcap_strerror(errno));
380 exit(1);
381 }
382 }
383 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
384 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
385 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
386 username,
387 (unsigned long)pw->pw_uid,
388 (unsigned long)pw->pw_gid,
389 pcap_strerror(errno));
390 exit(1);
391 }
392 }
393 else {
394 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
395 username);
396 exit(1);
397 }
398 }
399 #endif /* WIN32 */
400
401 static int
402 getWflagChars(int x)
403 {
404 int c = 0;
405
406 x -= 1;
407 while (x > 0) {
408 c += 1;
409 x /= 10;
410 }
411
412 return c;
413 }
414
415
416 static void
417 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
418 {
419 char *filename = malloc(NAME_MAX + 1);
420
421 /* Process with strftime if Gflag is set. */
422 if (Gflag != 0) {
423 struct tm *local_tm;
424
425 /* Convert Gflag_time to a usable format */
426 if ((local_tm = localtime(&Gflag_time)) == NULL) {
427 error("MakeTimedFilename: localtime");
428 }
429
430 /* There's no good way to detect an error in strftime since a return
431 * value of 0 isn't necessarily failure.
432 */
433 strftime(filename, NAME_MAX, orig_name, local_tm);
434 } else {
435 strncpy(filename, orig_name, NAME_MAX);
436 }
437
438 if (cnt == 0 && max_chars == 0)
439 strncpy(buffer, filename, NAME_MAX + 1);
440 else
441 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
442 /* Report an error if the filename is too large */
443 error("too many output files or filename is too long (> %d)", NAME_MAX);
444 free(filename);
445 }
446
447 static int tcpdump_printf(netdissect_options *ndo _U_,
448 const char *fmt, ...)
449 {
450
451 va_list args;
452 int ret;
453
454 va_start(args, fmt);
455 ret=vfprintf(stdout, fmt, args);
456 va_end(args);
457
458 return ret;
459 }
460
461 int
462 main(int argc, char **argv)
463 {
464 register int cnt, op, i;
465 bpf_u_int32 localnet, netmask;
466 register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
467 pcap_handler callback;
468 int type;
469 struct bpf_program fcode;
470 #ifndef WIN32
471 RETSIGTYPE (*oldhandler)(int);
472 #endif
473 struct print_info printinfo;
474 struct dump_info dumpinfo;
475 u_char *pcap_userdata;
476 char ebuf[PCAP_ERRBUF_SIZE];
477 char *username = NULL;
478 char *chroot_dir = NULL;
479 #ifdef HAVE_PCAP_FINDALLDEVS
480 pcap_if_t *devpointer;
481 int devnum;
482 #endif
483 int status;
484 #ifdef WIN32
485 u_int UserBufferSize = 1000000;
486 if(wsockinit() != 0) return 1;
487 #endif /* WIN32 */
488
489 gndo->ndo_Oflag=1;
490 gndo->ndo_Rflag=1;
491 gndo->ndo_dlt=-1;
492 gndo->ndo_default_print=ndo_default_print;
493 gndo->ndo_printf=tcpdump_printf;
494 gndo->ndo_error=ndo_error;
495 gndo->ndo_warning=ndo_warning;
496 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
497
498 cnt = -1;
499 device = NULL;
500 infile = NULL;
501 RFileName = NULL;
502 WFileName = NULL;
503 if ((cp = strrchr(argv[0], '/')) != NULL)
504 program_name = cp + 1;
505 else
506 program_name = argv[0];
507
508 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
509 error("%s", ebuf);
510
511 #ifdef LIBSMI
512 smiInit("tcpdump");
513 #endif
514
515 opterr = 0;
516 while (
517 (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:lLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1)
518 switch (op) {
519
520 case 'a':
521 /* compatibility for old -a */
522 break;
523
524 case 'A':
525 ++Aflag;
526 break;
527
528 #ifdef WIN32
529 case 'B':
530 UserBufferSize = atoi(optarg)*1024;
531 if (UserBufferSize < 0)
532 error("invalid packet buffer size %s", optarg);
533 break;
534 #endif /* WIN32 */
535
536 case 'c':
537 cnt = atoi(optarg);
538 if (cnt <= 0)
539 error("invalid packet count %s", optarg);
540 break;
541
542 case 'C':
543 Cflag = atoi(optarg) * 1000000;
544 if (Cflag < 0)
545 error("invalid file size %s", optarg);
546 break;
547
548 case 'd':
549 ++dflag;
550 break;
551
552 #ifdef HAVE_PCAP_FINDALLDEVS
553 case 'D':
554 if (pcap_findalldevs(&devpointer, ebuf) < 0)
555 error("%s", ebuf);
556 else {
557 for (i = 0; devpointer != 0; i++) {
558 printf("%d.%s", i+1, devpointer->name);
559 if (devpointer->description != NULL)
560 printf(" (%s)", devpointer->description);
561 printf("\n");
562 devpointer = devpointer->next;
563 }
564 }
565 return 0;
566 #endif /* HAVE_PCAP_FINDALLDEVS */
567
568 case 'L':
569 Lflag++;
570 break;
571
572 case 'e':
573 ++eflag;
574 break;
575
576 case 'E':
577 #ifndef HAVE_LIBCRYPTO
578 warning("crypto code not compiled in");
579 #endif
580 gndo->ndo_espsecret = optarg;
581 break;
582
583 case 'f':
584 ++fflag;
585 break;
586
587 case 'F':
588 infile = optarg;
589 break;
590
591 case 'G':
592 Gflag = atoi(optarg);
593 /* We will create one file initially. */
594 Gflag_count = 0;
595 /* Grab the current time for rotation use. */
596 {
597 struct timeval t;
598 if (gettimeofday(&t, NULL) != 0) {
599 error("main: gettimeofday");
600 }
601 Gflag_time = t.tv_sec;
602 }
603 if (Gflag < 0)
604 error("invalid number of seconds %s", optarg);
605 break;
606
607 case 'i':
608 if (optarg[0] == '0' && optarg[1] == 0)
609 error("Invalid adapter index");
610
611 #ifdef HAVE_PCAP_FINDALLDEVS
612 /*
613 * If the argument is a number, treat it as
614 * an index into the list of adapters, as
615 * printed by "tcpdump -D".
616 *
617 * This should be OK on UNIX systems, as interfaces
618 * shouldn't have names that begin with digits.
619 * It can be useful on Windows, where more than
620 * one interface can have the same name.
621 */
622 if ((devnum = atoi(optarg)) != 0) {
623 if (devnum < 0)
624 error("Invalid adapter index");
625
626 if (pcap_findalldevs(&devpointer, ebuf) < 0)
627 error("%s", ebuf);
628 else {
629 for (i = 0; i < devnum-1; i++){
630 devpointer = devpointer->next;
631 if (devpointer == NULL)
632 error("Invalid adapter index");
633 }
634 }
635 device = devpointer->name;
636 break;
637 }
638 #endif /* HAVE_PCAP_FINDALLDEVS */
639 device = optarg;
640 break;
641
642 case 'l':
643 #ifdef WIN32
644 /*
645 * _IOLBF is the same as _IOFBF in Microsoft's C
646 * libraries; the only alternative they offer
647 * is _IONBF.
648 *
649 * XXX - this should really be checking for MSVC++,
650 * not WIN32, if, for example, MinGW has its own
651 * C library that is more UNIX-compatible.
652 */
653 setvbuf(stdout, NULL, _IONBF, 0);
654 #else /* WIN32 */
655 #ifdef HAVE_SETLINEBUF
656 setlinebuf(stdout);
657 #else
658 setvbuf(stdout, NULL, _IOLBF, 0);
659 #endif
660 #endif /* WIN32 */
661 break;
662
663 case 'n':
664 ++nflag;
665 break;
666
667 case 'N':
668 ++Nflag;
669 break;
670
671 case 'm':
672 #ifdef LIBSMI
673 if (smiLoadModule(optarg) == 0) {
674 error("could not load MIB module %s", optarg);
675 }
676 sflag = 1;
677 #else
678 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
679 program_name, optarg);
680 (void)fprintf(stderr, "(no libsmi support)\n");
681 #endif
682 break;
683
684 case 'M':
685 /* TCP-MD5 shared secret */
686 #ifndef HAVE_LIBCRYPTO
687 warning("crypto code not compiled in");
688 #endif
689 tcpmd5secret = optarg;
690 break;
691
692 case 'O':
693 Oflag = 0;
694 break;
695
696 case 'p':
697 ++pflag;
698 break;
699
700 case 'q':
701 ++qflag;
702 ++suppress_default_print;
703 break;
704
705 case 'r':
706 RFileName = optarg;
707 break;
708
709 case 'R':
710 Rflag = 0;
711 break;
712
713 case 's': {
714 char *end;
715
716 snaplen = strtol(optarg, &end, 0);
717 if (optarg == end || *end != '\0'
718 || snaplen < 0 || snaplen > 65535)
719 error("invalid snaplen %s", optarg);
720 else if (snaplen == 0)
721 snaplen = 65535;
722 break;
723 }
724
725 case 'S':
726 ++Sflag;
727 break;
728
729 case 't':
730 ++tflag;
731 break;
732
733 case 'T':
734 if (strcasecmp(optarg, "vat") == 0)
735 packettype = PT_VAT;
736 else if (strcasecmp(optarg, "wb") == 0)
737 packettype = PT_WB;
738 else if (strcasecmp(optarg, "rpc") == 0)
739 packettype = PT_RPC;
740 else if (strcasecmp(optarg, "rtp") == 0)
741 packettype = PT_RTP;
742 else if (strcasecmp(optarg, "rtcp") == 0)
743 packettype = PT_RTCP;
744 else if (strcasecmp(optarg, "snmp") == 0)
745 packettype = PT_SNMP;
746 else if (strcasecmp(optarg, "cnfp") == 0)
747 packettype = PT_CNFP;
748 else if (strcasecmp(optarg, "tftp") == 0)
749 packettype = PT_TFTP;
750 else if (strcasecmp(optarg, "aodv") == 0)
751 packettype = PT_AODV;
752 else
753 error("unknown packet type `%s'", optarg);
754 break;
755
756 case 'u':
757 ++uflag;
758 break;
759
760 #ifdef HAVE_PCAP_DUMP_FLUSH
761 case 'U':
762 ++Uflag;
763 break;
764 #endif
765
766 case 'v':
767 ++vflag;
768 break;
769
770 case 'w':
771 WFileName = optarg;
772 break;
773
774 case 'W':
775 Wflag = atoi(optarg);
776 if (Wflag < 0)
777 error("invalid number of output files %s", optarg);
778 WflagChars = getWflagChars(Wflag);
779 break;
780
781 case 'x':
782 ++xflag;
783 ++suppress_default_print;
784 break;
785
786 case 'X':
787 ++Xflag;
788 ++suppress_default_print;
789 break;
790
791 case 'y':
792 gndo->ndo_dltname = optarg;
793 gndo->ndo_dlt =
794 pcap_datalink_name_to_val(gndo->ndo_dltname);
795 if (gndo->ndo_dlt < 0)
796 error("invalid data link type %s", gndo->ndo_dltname);
797 break;
798
799 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
800 case 'Y':
801 {
802 /* Undocumented flag */
803 #ifdef HAVE_PCAP_DEBUG
804 extern int pcap_debug;
805 pcap_debug = 1;
806 #else
807 extern int yydebug;
808 yydebug = 1;
809 #endif
810 }
811 break;
812 #endif
813 case 'Z':
814 if (optarg) {
815 username = strdup(optarg);
816 }
817 else {
818 usage();
819 /* NOTREACHED */
820 }
821 break;
822
823 default:
824 usage();
825 /* NOTREACHED */
826 }
827
828 switch (tflag) {
829
830 case 0: /* Default */
831 case 4: /* Default + Date*/
832 thiszone = gmt2local(0);
833 break;
834
835 case 1: /* No time stamp */
836 case 2: /* Unix timeval style */
837 case 3: /* Microseconds since previous packet */
838 break;
839
840 default: /* Not supported */
841 error("only -t, -tt, -ttt, and -tttt are supported");
842 break;
843 }
844
845 #ifdef WITH_CHROOT
846 /* if run as root, prepare for chrooting */
847 if (getuid() == 0 || geteuid() == 0) {
848 /* future extensibility for cmd-line arguments */
849 if (!chroot_dir)
850 chroot_dir = WITH_CHROOT;
851 }
852 #endif
853
854 #ifdef WITH_USER
855 /* if run as root, prepare for dropping root privileges */
856 if (getuid() == 0 || geteuid() == 0) {
857 /* Run with '-Z root' to restore old behaviour */
858 if (!username)
859 username = WITH_USER;
860 }
861 #endif
862
863 if (RFileName != NULL) {
864 int dlt;
865 const char *dlt_name;
866
867 #ifndef WIN32
868 /*
869 * We don't need network access, so relinquish any set-UID
870 * or set-GID privileges we have (if any).
871 *
872 * We do *not* want set-UID privileges when opening a
873 * trace file, as that might let the user read other
874 * people's trace files (especially if we're set-UID
875 * root).
876 */
877 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
878 fprintf(stderr, "Warning: setgid/setuid failed !\n");
879 #endif /* WIN32 */
880 pd = pcap_open_offline(RFileName, ebuf);
881 if (pd == NULL)
882 error("%s", ebuf);
883 dlt = pcap_datalink(pd);
884 dlt_name = pcap_datalink_val_to_name(dlt);
885 if (dlt_name == NULL) {
886 fprintf(stderr, "reading from file %s, link-type %u\n",
887 RFileName, dlt);
888 } else {
889 fprintf(stderr,
890 "reading from file %s, link-type %s (%s)\n",
891 RFileName, dlt_name,
892 pcap_datalink_val_to_description(dlt));
893 }
894 localnet = 0;
895 netmask = 0;
896 if (fflag != 0)
897 error("-f and -r options are incompatible");
898 } else {
899 if (device == NULL) {
900 device = pcap_lookupdev(ebuf);
901 if (device == NULL)
902 error("%s", ebuf);
903 }
904 #ifdef WIN32
905 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
906 { //a Unicode string has a \0 as second byte (so strlen() is 1)
907 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
908 }
909 else
910 {
911 fprintf(stderr, "%s: listening on %s\n", program_name, device);
912 }
913
914 fflush(stderr);
915 #endif /* WIN32 */
916 *ebuf = '\0';
917 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
918 if (pd == NULL)
919 error("%s", ebuf);
920 else if (*ebuf)
921 warning("%s", ebuf);
922 /*
923 * Let user own process after socket has been opened.
924 */
925 #ifndef WIN32
926 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
927 fprintf(stderr, "Warning: setgid/setuid failed !\n");
928 #endif /* WIN32 */
929 #ifdef WIN32
930 if(UserBufferSize != 1000000)
931 if(pcap_setbuff(pd, UserBufferSize)==-1){
932 error("%s", pcap_geterr(pd));
933 }
934 #endif /* WIN32 */
935 if (Lflag)
936 show_dlts_and_exit(pd);
937 if (gndo->ndo_dlt >= 0) {
938 #ifdef HAVE_PCAP_SET_DATALINK
939 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
940 error("%s", pcap_geterr(pd));
941 #else
942 /*
943 * We don't actually support changing the
944 * data link type, so we only let them
945 * set it to what it already is.
946 */
947 if (gndo->ndo_dlt != pcap_datalink(pd)) {
948 error("%s is not one of the DLTs supported by this device\n",
949 gndo->ndo_dltname);
950 }
951 #endif
952 (void)fprintf(stderr, "%s: data link type %s\n",
953 program_name, gndo->ndo_dltname);
954 (void)fflush(stderr);
955 }
956 i = pcap_snapshot(pd);
957 if (snaplen < i) {
958 warning("snaplen raised from %d to %d", snaplen, i);
959 snaplen = i;
960 }
961 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
962 localnet = 0;
963 netmask = 0;
964 warning("%s", ebuf);
965 }
966 }
967 if (infile)
968 cmdbuf = read_infile(infile);
969 else
970 cmdbuf = copy_argv(&argv[optind]);
971
972 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
973 error("%s", pcap_geterr(pd));
974 if (dflag) {
975 bpf_dump(&fcode, dflag);
976 pcap_close(pd);
977 exit(0);
978 }
979 init_addrtoname(localnet, netmask);
980
981 #ifndef WIN32
982 (void)setsignal(SIGPIPE, cleanup);
983 #endif /* WIN32 */
984 (void)setsignal(SIGTERM, cleanup);
985 (void)setsignal(SIGINT, cleanup);
986 /* Cooperate with nohup(1) */
987 #ifndef WIN32
988 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
989 (void)setsignal(SIGHUP, oldhandler);
990 #endif /* WIN32 */
991
992 if (pcap_setfilter(pd, &fcode) < 0)
993 error("%s", pcap_geterr(pd));
994 if (WFileName) {
995 pcap_dumper_t *p;
996 /* Do not exceed the default NAME_MAX for files. */
997 WFileNameAlt = (char *)malloc(NAME_MAX + 1);
998
999 if (WFileNameAlt == NULL)
1000 error("malloc of WFileNameAlt");
1001
1002 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1003 if (Cflag != 0)
1004 MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
1005 else
1006 MakeFilename(WFileNameAlt, WFileName, 0, 0);
1007
1008 p = pcap_dump_open(pd, WFileNameAlt);
1009 free(WFileNameAlt);
1010 if (p == NULL)
1011 error("%s", pcap_geterr(pd));
1012 if (Cflag != 0 || Gflag != 0) {
1013 callback = dump_packet_and_trunc;
1014 dumpinfo.WFileName = WFileName;
1015 dumpinfo.pd = pd;
1016 dumpinfo.p = p;
1017 pcap_userdata = (u_char *)&dumpinfo;
1018 } else {
1019 callback = dump_packet;
1020 pcap_userdata = (u_char *)p;
1021 }
1022 } else {
1023 type = pcap_datalink(pd);
1024 printinfo.printer = lookup_printer(type);
1025 if (printinfo.printer == NULL) {
1026 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1027 if (gndo->ndo_dltname != NULL)
1028 error("unsupported data link type %s",
1029 gndo->ndo_dltname);
1030 else
1031 error("unsupported data link type %d", type);
1032 }
1033 callback = print_packet;
1034 pcap_userdata = (u_char *)&printinfo;
1035 }
1036 #ifndef WIN32
1037 /*
1038 * We cannot do this earlier, because we want to be able to open
1039 * the file (if done) for writing before giving up permissions.
1040 */
1041 if (getuid() == 0 || geteuid() == 0) {
1042 if (username || chroot_dir)
1043 droproot(username, chroot_dir);
1044 }
1045 #endif /* WIN32 */
1046 #ifdef SIGINFO
1047 (void)setsignal(SIGINFO, requestinfo);
1048 #endif
1049
1050 if (vflag > 0 && WFileName) {
1051 /*
1052 * When capturing to a file, "-v" means tcpdump should,
1053 * every 10 secodns, "v"erbosely report the number of
1054 * packets captured.
1055 */
1056 #ifdef USE_WIN32_MM_TIMER
1057 /* call verbose_stats_dump() each 1000 +/-100msec */
1058 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1059 setvbuf(stderr, NULL, _IONBF, 0);
1060 #elif defined(HAVE_ALARM)
1061 (void)setsignal(SIGALRM, verbose_stats_dump);
1062 alarm(1);
1063 #endif
1064 }
1065
1066 #ifndef WIN32
1067 if (RFileName == NULL) {
1068 int dlt;
1069 const char *dlt_name;
1070
1071 if (!vflag && !WFileName) {
1072 (void)fprintf(stderr,
1073 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1074 program_name);
1075 } else
1076 (void)fprintf(stderr, "%s: ", program_name);
1077 dlt = pcap_datalink(pd);
1078 dlt_name = pcap_datalink_val_to_name(dlt);
1079 if (dlt_name == NULL) {
1080 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1081 device, dlt, snaplen);
1082 } else {
1083 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1084 device, dlt_name,
1085 pcap_datalink_val_to_description(dlt), snaplen);
1086 }
1087 (void)fflush(stderr);
1088 }
1089 #endif /* WIN32 */
1090 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1091 if (WFileName == NULL) {
1092 /*
1093 * We're printing packets. Flush the printed output,
1094 * so it doesn't get intermingled with error output.
1095 */
1096 if (status == -2) {
1097 /*
1098 * We got interrupted, so perhaps we didn't
1099 * manage to finish a line we were printing.
1100 * Print an extra newline, just in case.
1101 */
1102 putchar('\n');
1103 }
1104 (void)fflush(stdout);
1105 }
1106 if (status == -1) {
1107 /*
1108 * Error. Report it.
1109 */
1110 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1111 program_name, pcap_geterr(pd));
1112 }
1113 if (RFileName == NULL) {
1114 /*
1115 * We're doing a live capture. Report the capture
1116 * statistics.
1117 */
1118 info(1);
1119 }
1120 pcap_close(pd);
1121 exit(status == -1 ? 1 : 0);
1122 }
1123
1124 /* make a clean exit on interrupts */
1125 static RETSIGTYPE
1126 cleanup(int signo _U_)
1127 {
1128 #ifdef USE_WIN32_MM_TIMER
1129 if (timer_id)
1130 timeKillEvent(timer_id);
1131 timer_id = 0;
1132 #elif defined(HAVE_ALARM)
1133 alarm(0);
1134 #endif
1135
1136 #ifdef HAVE_PCAP_BREAKLOOP
1137 /*
1138 * We have "pcap_breakloop()"; use it, so that we do as little
1139 * as possible in the signal handler (it's probably not safe
1140 * to do anything with standard I/O streams in a signal handler -
1141 * the ANSI C standard doesn't say it is).
1142 */
1143 pcap_breakloop(pd);
1144 #else
1145 /*
1146 * We don't have "pcap_breakloop()"; this isn't safe, but
1147 * it's the best we can do. Print the summary if we're
1148 * not reading from a savefile - i.e., if we're doing a
1149 * live capture - and exit.
1150 */
1151 if (pd != NULL && pcap_file(pd) == NULL) {
1152 /*
1153 * We got interrupted, so perhaps we didn't
1154 * manage to finish a line we were printing.
1155 * Print an extra newline, just in case.
1156 */
1157 putchar('\n');
1158 (void)fflush(stdout);
1159 info(1);
1160 }
1161 exit(0);
1162 #endif
1163 }
1164
1165 static void
1166 info(register int verbose)
1167 {
1168 struct pcap_stat stat;
1169
1170 if (pcap_stats(pd, &stat) < 0) {
1171 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1172 return;
1173 }
1174
1175 if (!verbose)
1176 fprintf(stderr, "%s: ", program_name);
1177
1178 (void)fprintf(stderr, "%u packets captured", packets_captured);
1179 if (!verbose)
1180 fputs(", ", stderr);
1181 else
1182 putc('\n', stderr);
1183 (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1184 if (!verbose)
1185 fputs(", ", stderr);
1186 else
1187 putc('\n', stderr);
1188 (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1189 infoprint = 0;
1190 }
1191
1192 static void
1193 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1194 {
1195 struct dump_info *dump_info;
1196 char *name;
1197
1198 ++packets_captured;
1199
1200 ++infodelay;
1201
1202 dump_info = (struct dump_info *)user;
1203
1204 /*
1205 * XXX - this won't force the file to rotate on the specified time
1206 * boundary, but it will rotate on the first packet received after the
1207 * specified Gflag number of seconds. Note: if a Gflag time boundary
1208 * and a Cflag size boundary coincide, the time rotation will occur
1209 * first thereby cancelling the Cflag boundary (since the file should
1210 * be 0).
1211 */
1212 if (Gflag != 0) {
1213 /* Check if it is time to rotate */
1214 struct timeval t;
1215
1216 /* Get the current time */
1217 if (gettimeofday(&t, NULL) != 0) {
1218 error("dump_and_trunc_packet: gettimeofday");
1219 }
1220
1221
1222 /* If the time is greater than the specified window, rotate */
1223 if (t.tv_sec - Gflag_time >= Gflag) {
1224 /* Update the Gflag_time */
1225 Gflag_time = t.tv_sec;
1226 /* Update Gflag_count */
1227 Gflag_count++;
1228 /*
1229 * Close the current file and open a new one.
1230 */
1231 pcap_dump_close(dump_info->p);
1232
1233 /* Check to see if we've exceeded the Wflag (when not using Cflag). */
1234 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1235 (void)fprintf(stderr, "Maximum file limit reached: %d\n", Wflag);
1236 (void)fflush(stderr);
1237 exit(0);
1238 /* NOTREACHED */
1239 }
1240 /* Allocate space for max filename + \0. */
1241 name = (char *)malloc(NAME_MAX + 1);
1242 if (name == NULL)
1243 error("dump_packet_and_trunc: malloc");
1244 /* This is always the first file in the Cflag rotation: e.g. 0
1245 * We also don't need numbering if Cflag is not set.
1246 */
1247 if (Cflag != 0)
1248 MakeFilename(name, dump_info->WFileName, 0, WflagChars);
1249 else
1250 MakeFilename(name, dump_info->WFileName, 0, 0);
1251
1252 dump_info->p = pcap_dump_open(dump_info->pd, name);
1253 free(name);
1254 if (dump_info->p == NULL)
1255 error("%s", pcap_geterr(pd));
1256
1257 }
1258 }
1259
1260 /*
1261 * XXX - this won't prevent capture files from getting
1262 * larger than Cflag - the last packet written to the
1263 * file could put it over Cflag.
1264 */
1265 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1266 /*
1267 * Close the current file and open a new one.
1268 */
1269 pcap_dump_close(dump_info->p);
1270 Cflag_count++;
1271 if (Wflag > 0) {
1272 if (Cflag_count >= Wflag)
1273 Cflag_count = 0;
1274 }
1275 name = (char *)malloc(NAME_MAX + 1);
1276 if (name == NULL)
1277 error("dump_packet_and_trunc: malloc");
1278 MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1279 dump_info->p = pcap_dump_open(dump_info->pd, name);
1280 free(name);
1281 if (dump_info->p == NULL)
1282 error("%s", pcap_geterr(pd));
1283 }
1284
1285 pcap_dump((u_char *)dump_info->p, h, sp);
1286 #ifdef HAVE_PCAP_DUMP_FLUSH
1287 if (Uflag)
1288 pcap_dump_flush(dump_info->p);
1289 #endif
1290
1291 --infodelay;
1292 if (infoprint)
1293 info(0);
1294 }
1295
1296 static void
1297 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1298 {
1299 ++packets_captured;
1300
1301 ++infodelay;
1302
1303 pcap_dump(user, h, sp);
1304 #ifdef HAVE_PCAP_DUMP_FLUSH
1305 if (Uflag)
1306 pcap_dump_flush((pcap_dumper_t *)user);
1307 #endif
1308
1309 --infodelay;
1310 if (infoprint)
1311 info(0);
1312 }
1313
1314 static void
1315 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1316 {
1317 struct print_info *print_info;
1318 u_int hdrlen;
1319
1320 ++packets_captured;
1321
1322 ++infodelay;
1323 ts_print(&h->ts);
1324
1325 print_info = (struct print_info *)user;
1326
1327 /*
1328 * Some printers want to check that they're not walking off the
1329 * end of the packet.
1330 * Rather than pass it all the way down, we set this global.
1331 */
1332 snapend = sp + h->caplen;
1333
1334 hdrlen = (*print_info->printer)(h, sp);
1335 if (Xflag) {
1336 /*
1337 * Print the raw packet data in hex and ASCII.
1338 */
1339 if (Xflag > 1) {
1340 /*
1341 * Include the link-layer header.
1342 */
1343 hex_and_ascii_print("\n\t", sp, h->caplen);
1344 } else {
1345 /*
1346 * Don't include the link-layer header - and if
1347 * we have nothing past the link-layer header,
1348 * print nothing.
1349 */
1350 if (h->caplen > hdrlen)
1351 hex_and_ascii_print("\n\t", sp + hdrlen,
1352 h->caplen - hdrlen);
1353 }
1354 } else if (xflag) {
1355 /*
1356 * Print the raw packet data in hex.
1357 */
1358 if (xflag > 1) {
1359 /*
1360 * Include the link-layer header.
1361 */
1362 hex_print("\n\t", sp, h->caplen);
1363 } else {
1364 /*
1365 * Don't include the link-layer header - and if
1366 * we have nothing past the link-layer header,
1367 * print nothing.
1368 */
1369 if (h->caplen > hdrlen)
1370 hex_print("\n\t", sp + hdrlen,
1371 h->caplen - hdrlen);
1372 }
1373 } else if (Aflag) {
1374 /*
1375 * Print the raw packet data in ASCII.
1376 */
1377 if (Aflag > 1) {
1378 /*
1379 * Include the link-layer header.
1380 */
1381 ascii_print(sp, h->caplen);
1382 } else {
1383 /*
1384 * Don't include the link-layer header - and if
1385 * we have nothing past the link-layer header,
1386 * print nothing.
1387 */
1388 if (h->caplen > hdrlen)
1389 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1390 }
1391 }
1392
1393 putchar('\n');
1394
1395 --infodelay;
1396 if (infoprint)
1397 info(0);
1398 }
1399
1400 #ifdef WIN32
1401 /*
1402 * XXX - there should really be libpcap calls to get the version
1403 * number as a string (the string would be generated from #defines
1404 * at run time, so that it's not generated from string constants
1405 * in the library, as, on many UNIX systems, those constants would
1406 * be statically linked into the application executable image, and
1407 * would thus reflect the version of libpcap on the system on
1408 * which the application was *linked*, not the system on which it's
1409 * *running*.
1410 *
1411 * That routine should be documented, unlike the "version[]"
1412 * string, so that UNIX vendors providing their own libpcaps
1413 * don't omit it (as a couple of vendors have...).
1414 *
1415 * Packet.dll should perhaps also export a routine to return the
1416 * version number of the Packet.dll code, to supply the
1417 * "Wpcap_version" information on Windows.
1418 */
1419 char WDversion[]="current-cvs.tcpdump.org";
1420 #if !defined(HAVE_GENERATED_VERSION)
1421 char version[]="current-cvs.tcpdump.org";
1422 #endif
1423 char pcap_version[]="current-cvs.tcpdump.org";
1424 char Wpcap_version[]="3.1";
1425 #endif
1426
1427 /*
1428 * By default, print the specified data out in hex and ASCII.
1429 */
1430 static void
1431 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1432 {
1433 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1434 }
1435
1436 void
1437 default_print(const u_char *bp, u_int length)
1438 {
1439 ndo_default_print(gndo, bp, length);
1440 }
1441
1442 #ifdef SIGINFO
1443 RETSIGTYPE requestinfo(int signo _U_)
1444 {
1445 if (infodelay)
1446 ++infoprint;
1447 else
1448 info(0);
1449 }
1450 #endif
1451
1452 /*
1453 * Called once each second in verbose mode while dumping to file
1454 */
1455 #ifdef USE_WIN32_MM_TIMER
1456 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1457 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1458 {
1459 struct pcap_stat stat;
1460
1461 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1462 fprintf(stderr, "Got %u\r", packets_captured);
1463 }
1464 #elif defined(HAVE_ALARM)
1465 static void verbose_stats_dump(int sig _U_)
1466 {
1467 struct pcap_stat stat;
1468
1469 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1470 fprintf(stderr, "Got %u\r", packets_captured);
1471 alarm(1);
1472 }
1473 #endif
1474
1475 static void
1476 usage(void)
1477 {
1478 extern char version[];
1479 #ifndef HAVE_PCAP_LIB_VERSION
1480 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1481 extern char pcap_version[];
1482 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1483 static char pcap_version[] = "unknown";
1484 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1485 #endif /* HAVE_PCAP_LIB_VERSION */
1486
1487 #ifdef HAVE_PCAP_LIB_VERSION
1488 #ifdef WIN32
1489 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1490 #else /* WIN32 */
1491 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1492 #endif /* WIN32 */
1493 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1494 #else /* HAVE_PCAP_LIB_VERSION */
1495 #ifdef WIN32
1496 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1497 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1498 #else /* WIN32 */
1499 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1500 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1501 #endif /* WIN32 */
1502 #endif /* HAVE_PCAP_LIB_VERSION */
1503 (void)fprintf(stderr,
1504 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1505 (void)fprintf(stderr,
1506 "\t\t[ -E algo:secret ] [ -F file ] [ -G seconds ] [ -i interface ]\n");
1507 (void)fprintf(stderr,
1508 "\t\t[ -M secret ] [ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1509 (void)fprintf(stderr,
1510 "\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1511 (void)fprintf(stderr,
1512 "\t\t[ expression ]\n");
1513 exit(1);
1514 }
1515
1516
1517
1518 /* VARARGS */
1519 static void
1520 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1521 {
1522 va_list ap;
1523
1524 (void)fprintf(stderr, "%s: ", program_name);
1525 va_start(ap, fmt);
1526 (void)vfprintf(stderr, fmt, ap);
1527 va_end(ap);
1528 if (*fmt) {
1529 fmt += strlen(fmt);
1530 if (fmt[-1] != '\n')
1531 (void)fputc('\n', stderr);
1532 }
1533 exit(1);
1534 /* NOTREACHED */
1535 }
1536
1537 /* VARARGS */
1538 static void
1539 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1540 {
1541 va_list ap;
1542
1543 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1544 va_start(ap, fmt);
1545 (void)vfprintf(stderr, fmt, ap);
1546 va_end(ap);
1547 if (*fmt) {
1548 fmt += strlen(fmt);
1549 if (fmt[-1] != '\n')
1550 (void)fputc('\n', stderr);
1551 }
1552 }
1553
[mirror] the TCPdump network dissector