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add basic support for Ethernet OAM Frames as per 802.3ah
[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 1.267 2006-02-09 20:33:49 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 #ifdef DLT_MFR
265 { mfr_if_print, DLT_MFR },
266 #endif
267 { NULL, 0 },
268 };
269
270 static if_printer
271 lookup_printer(int type)
272 {
273 struct printer *p;
274
275 for (p = printers; p->f; ++p)
276 if (type == p->type)
277 return p->f;
278
279 return NULL;
280 /* NOTREACHED */
281 }
282
283 static pcap_t *pd;
284
285 extern int optind;
286 extern int opterr;
287 extern char *optarg;
288
289 struct print_info {
290 if_printer printer;
291 };
292
293 struct dump_info {
294 char *WFileName;
295 pcap_t *pd;
296 pcap_dumper_t *p;
297 };
298
299 static void
300 show_dlts_and_exit(pcap_t *pd)
301 {
302 int n_dlts;
303 int *dlts = 0;
304 const char *dlt_name;
305
306 n_dlts = pcap_list_datalinks(pd, &dlts);
307 if (n_dlts < 0)
308 error("%s", pcap_geterr(pd));
309 else if (n_dlts == 0 || !dlts)
310 error("No data link types.");
311
312 (void) fprintf(stderr, "Data link types (use option -y to set):\n");
313
314 while (--n_dlts >= 0) {
315 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
316 if (dlt_name != NULL) {
317 (void) fprintf(stderr, " %s (%s)", dlt_name,
318 pcap_datalink_val_to_description(dlts[n_dlts]));
319
320 /*
321 * OK, does tcpdump handle that type?
322 */
323 if (lookup_printer(dlts[n_dlts]) == NULL)
324 (void) fprintf(stderr, " (not supported)");
325 putchar('\n');
326 } else {
327 (void) fprintf(stderr, " DLT %d (not supported)\n",
328 dlts[n_dlts]);
329 }
330 }
331 free(dlts);
332 exit(0);
333 }
334
335 /*
336 * Set up flags that might or might not be supported depending on the
337 * version of libpcap we're using.
338 */
339 #ifdef WIN32
340 #define B_FLAG "B:"
341 #define B_FLAG_USAGE " [ -B size ]"
342 #else /* WIN32 */
343 #define B_FLAG
344 #define B_FLAG_USAGE
345 #endif /* WIN32 */
346
347 #ifdef HAVE_PCAP_FINDALLDEVS
348 #ifndef HAVE_PCAP_IF_T
349 #undef HAVE_PCAP_FINDALLDEVS
350 #endif
351 #endif
352
353 #ifdef HAVE_PCAP_FINDALLDEVS
354 #define D_FLAG "D"
355 #else
356 #define D_FLAG
357 #endif
358
359 #ifdef HAVE_PCAP_DUMP_FLUSH
360 #define U_FLAG "U"
361 #else
362 #define U_FLAG
363 #endif
364
365 #ifndef WIN32
366 /* Drop root privileges and chroot if necessary */
367 static void
368 droproot(const char *username, const char *chroot_dir)
369 {
370 struct passwd *pw = NULL;
371
372 if (chroot_dir && !username) {
373 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
374 exit(1);
375 }
376
377 pw = getpwnam(username);
378 if (pw) {
379 if (chroot_dir) {
380 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
381 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
382 chroot_dir, pcap_strerror(errno));
383 exit(1);
384 }
385 }
386 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
387 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
388 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
389 username,
390 (unsigned long)pw->pw_uid,
391 (unsigned long)pw->pw_gid,
392 pcap_strerror(errno));
393 exit(1);
394 }
395 }
396 else {
397 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
398 username);
399 exit(1);
400 }
401 }
402 #endif /* WIN32 */
403
404 static int
405 getWflagChars(int x)
406 {
407 int c = 0;
408
409 x -= 1;
410 while (x > 0) {
411 c += 1;
412 x /= 10;
413 }
414
415 return c;
416 }
417
418
419 static void
420 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
421 {
422 char *filename = malloc(NAME_MAX + 1);
423
424 /* Process with strftime if Gflag is set. */
425 if (Gflag != 0) {
426 struct tm *local_tm;
427
428 /* Convert Gflag_time to a usable format */
429 if ((local_tm = localtime(&Gflag_time)) == NULL) {
430 error("MakeTimedFilename: localtime");
431 }
432
433 /* There's no good way to detect an error in strftime since a return
434 * value of 0 isn't necessarily failure.
435 */
436 strftime(filename, NAME_MAX, orig_name, local_tm);
437 } else {
438 strncpy(filename, orig_name, NAME_MAX);
439 }
440
441 if (cnt == 0 && max_chars == 0)
442 strncpy(buffer, filename, NAME_MAX + 1);
443 else
444 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
445 /* Report an error if the filename is too large */
446 error("too many output files or filename is too long (> %d)", NAME_MAX);
447 free(filename);
448 }
449
450 static int tcpdump_printf(netdissect_options *ndo _U_,
451 const char *fmt, ...)
452 {
453
454 va_list args;
455 int ret;
456
457 va_start(args, fmt);
458 ret=vfprintf(stdout, fmt, args);
459 va_end(args);
460
461 return ret;
462 }
463
464 int
465 main(int argc, char **argv)
466 {
467 register int cnt, op, i;
468 bpf_u_int32 localnet, netmask;
469 register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
470 pcap_handler callback;
471 int type;
472 struct bpf_program fcode;
473 #ifndef WIN32
474 RETSIGTYPE (*oldhandler)(int);
475 #endif
476 struct print_info printinfo;
477 struct dump_info dumpinfo;
478 u_char *pcap_userdata;
479 char ebuf[PCAP_ERRBUF_SIZE];
480 char *username = NULL;
481 char *chroot_dir = NULL;
482 #ifdef HAVE_PCAP_FINDALLDEVS
483 pcap_if_t *devpointer;
484 int devnum;
485 #endif
486 int status;
487 #ifdef WIN32
488 u_int UserBufferSize = 1000000;
489 if(wsockinit() != 0) return 1;
490 #endif /* WIN32 */
491
492 gndo->ndo_Oflag=1;
493 gndo->ndo_Rflag=1;
494 gndo->ndo_dlt=-1;
495 gndo->ndo_default_print=ndo_default_print;
496 gndo->ndo_printf=tcpdump_printf;
497 gndo->ndo_error=ndo_error;
498 gndo->ndo_warning=ndo_warning;
499 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
500
501 cnt = -1;
502 device = NULL;
503 infile = NULL;
504 RFileName = NULL;
505 WFileName = NULL;
506 if ((cp = strrchr(argv[0], '/')) != NULL)
507 program_name = cp + 1;
508 else
509 program_name = argv[0];
510
511 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
512 error("%s", ebuf);
513
514 #ifdef LIBSMI
515 smiInit("tcpdump");
516 #endif
517
518 opterr = 0;
519 while (
520 (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)
521 switch (op) {
522
523 case 'a':
524 /* compatibility for old -a */
525 break;
526
527 case 'A':
528 ++Aflag;
529 break;
530
531 #ifdef WIN32
532 case 'B':
533 UserBufferSize = atoi(optarg)*1024;
534 if (UserBufferSize < 0)
535 error("invalid packet buffer size %s", optarg);
536 break;
537 #endif /* WIN32 */
538
539 case 'c':
540 cnt = atoi(optarg);
541 if (cnt <= 0)
542 error("invalid packet count %s", optarg);
543 break;
544
545 case 'C':
546 Cflag = atoi(optarg) * 1000000;
547 if (Cflag < 0)
548 error("invalid file size %s", optarg);
549 break;
550
551 case 'd':
552 ++dflag;
553 break;
554
555 #ifdef HAVE_PCAP_FINDALLDEVS
556 case 'D':
557 if (pcap_findalldevs(&devpointer, ebuf) < 0)
558 error("%s", ebuf);
559 else {
560 for (i = 0; devpointer != 0; i++) {
561 printf("%d.%s", i+1, devpointer->name);
562 if (devpointer->description != NULL)
563 printf(" (%s)", devpointer->description);
564 printf("\n");
565 devpointer = devpointer->next;
566 }
567 }
568 return 0;
569 #endif /* HAVE_PCAP_FINDALLDEVS */
570
571 case 'L':
572 Lflag++;
573 break;
574
575 case 'e':
576 ++eflag;
577 break;
578
579 case 'E':
580 #ifndef HAVE_LIBCRYPTO
581 warning("crypto code not compiled in");
582 #endif
583 gndo->ndo_espsecret = optarg;
584 break;
585
586 case 'f':
587 ++fflag;
588 break;
589
590 case 'F':
591 infile = optarg;
592 break;
593
594 case 'G':
595 Gflag = atoi(optarg);
596 if (Gflag < 0)
597 error("invalid number of seconds %s", optarg);
598
599 /* We will create one file initially. */
600 Gflag_count = 0;
601
602 /* Grab the current time for rotation use. */
603 if ((Gflag_time = time(NULL)) == (time_t)-1) {
604 error("main: can't get current time: %s",
605 pcap_strerror(errno));
606 }
607 break;
608
609 case 'i':
610 if (optarg[0] == '0' && optarg[1] == 0)
611 error("Invalid adapter index");
612
613 #ifdef HAVE_PCAP_FINDALLDEVS
614 /*
615 * If the argument is a number, treat it as
616 * an index into the list of adapters, as
617 * printed by "tcpdump -D".
618 *
619 * This should be OK on UNIX systems, as interfaces
620 * shouldn't have names that begin with digits.
621 * It can be useful on Windows, where more than
622 * one interface can have the same name.
623 */
624 if ((devnum = atoi(optarg)) != 0) {
625 if (devnum < 0)
626 error("Invalid adapter index");
627
628 if (pcap_findalldevs(&devpointer, ebuf) < 0)
629 error("%s", ebuf);
630 else {
631 for (i = 0; i < devnum-1; i++){
632 devpointer = devpointer->next;
633 if (devpointer == NULL)
634 error("Invalid adapter index");
635 }
636 }
637 device = devpointer->name;
638 break;
639 }
640 #endif /* HAVE_PCAP_FINDALLDEVS */
641 device = optarg;
642 break;
643
644 case 'l':
645 #ifdef WIN32
646 /*
647 * _IOLBF is the same as _IOFBF in Microsoft's C
648 * libraries; the only alternative they offer
649 * is _IONBF.
650 *
651 * XXX - this should really be checking for MSVC++,
652 * not WIN32, if, for example, MinGW has its own
653 * C library that is more UNIX-compatible.
654 */
655 setvbuf(stdout, NULL, _IONBF, 0);
656 #else /* WIN32 */
657 #ifdef HAVE_SETLINEBUF
658 setlinebuf(stdout);
659 #else
660 setvbuf(stdout, NULL, _IOLBF, 0);
661 #endif
662 #endif /* WIN32 */
663 break;
664
665 case 'n':
666 ++nflag;
667 break;
668
669 case 'N':
670 ++Nflag;
671 break;
672
673 case 'm':
674 #ifdef LIBSMI
675 if (smiLoadModule(optarg) == 0) {
676 error("could not load MIB module %s", optarg);
677 }
678 sflag = 1;
679 #else
680 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
681 program_name, optarg);
682 (void)fprintf(stderr, "(no libsmi support)\n");
683 #endif
684 break;
685
686 case 'M':
687 /* TCP-MD5 shared secret */
688 #ifndef HAVE_LIBCRYPTO
689 warning("crypto code not compiled in");
690 #endif
691 tcpmd5secret = optarg;
692 break;
693
694 case 'O':
695 Oflag = 0;
696 break;
697
698 case 'p':
699 ++pflag;
700 break;
701
702 case 'q':
703 ++qflag;
704 ++suppress_default_print;
705 break;
706
707 case 'r':
708 RFileName = optarg;
709 break;
710
711 case 'R':
712 Rflag = 0;
713 break;
714
715 case 's': {
716 char *end;
717
718 snaplen = strtol(optarg, &end, 0);
719 if (optarg == end || *end != '\0'
720 || snaplen < 0 || snaplen > 65535)
721 error("invalid snaplen %s", optarg);
722 else if (snaplen == 0)
723 snaplen = 65535;
724 break;
725 }
726
727 case 'S':
728 ++Sflag;
729 break;
730
731 case 't':
732 ++tflag;
733 break;
734
735 case 'T':
736 if (strcasecmp(optarg, "vat") == 0)
737 packettype = PT_VAT;
738 else if (strcasecmp(optarg, "wb") == 0)
739 packettype = PT_WB;
740 else if (strcasecmp(optarg, "rpc") == 0)
741 packettype = PT_RPC;
742 else if (strcasecmp(optarg, "rtp") == 0)
743 packettype = PT_RTP;
744 else if (strcasecmp(optarg, "rtcp") == 0)
745 packettype = PT_RTCP;
746 else if (strcasecmp(optarg, "snmp") == 0)
747 packettype = PT_SNMP;
748 else if (strcasecmp(optarg, "cnfp") == 0)
749 packettype = PT_CNFP;
750 else if (strcasecmp(optarg, "tftp") == 0)
751 packettype = PT_TFTP;
752 else if (strcasecmp(optarg, "aodv") == 0)
753 packettype = PT_AODV;
754 else
755 error("unknown packet type `%s'", optarg);
756 break;
757
758 case 'u':
759 ++uflag;
760 break;
761
762 #ifdef HAVE_PCAP_DUMP_FLUSH
763 case 'U':
764 ++Uflag;
765 break;
766 #endif
767
768 case 'v':
769 ++vflag;
770 break;
771
772 case 'w':
773 WFileName = optarg;
774 break;
775
776 case 'W':
777 Wflag = atoi(optarg);
778 if (Wflag < 0)
779 error("invalid number of output files %s", optarg);
780 WflagChars = getWflagChars(Wflag);
781 break;
782
783 case 'x':
784 ++xflag;
785 ++suppress_default_print;
786 break;
787
788 case 'X':
789 ++Xflag;
790 ++suppress_default_print;
791 break;
792
793 case 'y':
794 gndo->ndo_dltname = optarg;
795 gndo->ndo_dlt =
796 pcap_datalink_name_to_val(gndo->ndo_dltname);
797 if (gndo->ndo_dlt < 0)
798 error("invalid data link type %s", gndo->ndo_dltname);
799 break;
800
801 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
802 case 'Y':
803 {
804 /* Undocumented flag */
805 #ifdef HAVE_PCAP_DEBUG
806 extern int pcap_debug;
807 pcap_debug = 1;
808 #else
809 extern int yydebug;
810 yydebug = 1;
811 #endif
812 }
813 break;
814 #endif
815 case 'Z':
816 if (optarg) {
817 username = strdup(optarg);
818 }
819 else {
820 usage();
821 /* NOTREACHED */
822 }
823 break;
824
825 default:
826 usage();
827 /* NOTREACHED */
828 }
829
830 switch (tflag) {
831
832 case 0: /* Default */
833 case 4: /* Default + Date*/
834 thiszone = gmt2local(0);
835 break;
836
837 case 1: /* No time stamp */
838 case 2: /* Unix timeval style */
839 case 3: /* Microseconds since previous packet */
840 case 5: /* Microseconds since first packet */
841 break;
842
843 default: /* Not supported */
844 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
845 break;
846 }
847
848 #ifdef WITH_CHROOT
849 /* if run as root, prepare for chrooting */
850 if (getuid() == 0 || geteuid() == 0) {
851 /* future extensibility for cmd-line arguments */
852 if (!chroot_dir)
853 chroot_dir = WITH_CHROOT;
854 }
855 #endif
856
857 #ifdef WITH_USER
858 /* if run as root, prepare for dropping root privileges */
859 if (getuid() == 0 || geteuid() == 0) {
860 /* Run with '-Z root' to restore old behaviour */
861 if (!username)
862 username = WITH_USER;
863 }
864 #endif
865
866 if (RFileName != NULL) {
867 int dlt;
868 const char *dlt_name;
869
870 #ifndef WIN32
871 /*
872 * We don't need network access, so relinquish any set-UID
873 * or set-GID privileges we have (if any).
874 *
875 * We do *not* want set-UID privileges when opening a
876 * trace file, as that might let the user read other
877 * people's trace files (especially if we're set-UID
878 * root).
879 */
880 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
881 fprintf(stderr, "Warning: setgid/setuid failed !\n");
882 #endif /* WIN32 */
883 pd = pcap_open_offline(RFileName, ebuf);
884 if (pd == NULL)
885 error("%s", ebuf);
886 dlt = pcap_datalink(pd);
887 dlt_name = pcap_datalink_val_to_name(dlt);
888 if (dlt_name == NULL) {
889 fprintf(stderr, "reading from file %s, link-type %u\n",
890 RFileName, dlt);
891 } else {
892 fprintf(stderr,
893 "reading from file %s, link-type %s (%s)\n",
894 RFileName, dlt_name,
895 pcap_datalink_val_to_description(dlt));
896 }
897 localnet = 0;
898 netmask = 0;
899 if (fflag != 0)
900 error("-f and -r options are incompatible");
901 } else {
902 if (device == NULL) {
903 device = pcap_lookupdev(ebuf);
904 if (device == NULL)
905 error("%s", ebuf);
906 }
907 #ifdef WIN32
908 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
909 { //a Unicode string has a \0 as second byte (so strlen() is 1)
910 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
911 }
912 else
913 {
914 fprintf(stderr, "%s: listening on %s\n", program_name, device);
915 }
916
917 fflush(stderr);
918 #endif /* WIN32 */
919 *ebuf = '\0';
920 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
921 if (pd == NULL)
922 error("%s", ebuf);
923 else if (*ebuf)
924 warning("%s", ebuf);
925 /*
926 * Let user own process after socket has been opened.
927 */
928 #ifndef WIN32
929 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
930 fprintf(stderr, "Warning: setgid/setuid failed !\n");
931 #endif /* WIN32 */
932 #ifdef WIN32
933 if(UserBufferSize != 1000000)
934 if(pcap_setbuff(pd, UserBufferSize)==-1){
935 error("%s", pcap_geterr(pd));
936 }
937 #endif /* WIN32 */
938 if (Lflag)
939 show_dlts_and_exit(pd);
940 if (gndo->ndo_dlt >= 0) {
941 #ifdef HAVE_PCAP_SET_DATALINK
942 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
943 error("%s", pcap_geterr(pd));
944 #else
945 /*
946 * We don't actually support changing the
947 * data link type, so we only let them
948 * set it to what it already is.
949 */
950 if (gndo->ndo_dlt != pcap_datalink(pd)) {
951 error("%s is not one of the DLTs supported by this device\n",
952 gndo->ndo_dltname);
953 }
954 #endif
955 (void)fprintf(stderr, "%s: data link type %s\n",
956 program_name, gndo->ndo_dltname);
957 (void)fflush(stderr);
958 }
959 i = pcap_snapshot(pd);
960 if (snaplen < i) {
961 warning("snaplen raised from %d to %d", snaplen, i);
962 snaplen = i;
963 }
964 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
965 localnet = 0;
966 netmask = 0;
967 warning("%s", ebuf);
968 }
969 }
970 if (infile)
971 cmdbuf = read_infile(infile);
972 else
973 cmdbuf = copy_argv(&argv[optind]);
974
975 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
976 error("%s", pcap_geterr(pd));
977 if (dflag) {
978 bpf_dump(&fcode, dflag);
979 pcap_close(pd);
980 exit(0);
981 }
982 init_addrtoname(localnet, netmask);
983 init_checksum();
984
985 #ifndef WIN32
986 (void)setsignal(SIGPIPE, cleanup);
987 #endif /* WIN32 */
988 (void)setsignal(SIGTERM, cleanup);
989 (void)setsignal(SIGINT, cleanup);
990 /* Cooperate with nohup(1) */
991 #ifndef WIN32
992 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
993 (void)setsignal(SIGHUP, oldhandler);
994 #endif /* WIN32 */
995
996 if (pcap_setfilter(pd, &fcode) < 0)
997 error("%s", pcap_geterr(pd));
998 if (WFileName) {
999 pcap_dumper_t *p;
1000 /* Do not exceed the default NAME_MAX for files. */
1001 WFileNameAlt = (char *)malloc(NAME_MAX + 1);
1002
1003 if (WFileNameAlt == NULL)
1004 error("malloc of WFileNameAlt");
1005
1006 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1007 if (Cflag != 0)
1008 MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
1009 else
1010 MakeFilename(WFileNameAlt, WFileName, 0, 0);
1011
1012 p = pcap_dump_open(pd, WFileNameAlt);
1013 free(WFileNameAlt);
1014 if (p == NULL)
1015 error("%s", pcap_geterr(pd));
1016 if (Cflag != 0 || Gflag != 0) {
1017 callback = dump_packet_and_trunc;
1018 dumpinfo.WFileName = WFileName;
1019 dumpinfo.pd = pd;
1020 dumpinfo.p = p;
1021 pcap_userdata = (u_char *)&dumpinfo;
1022 } else {
1023 callback = dump_packet;
1024 pcap_userdata = (u_char *)p;
1025 }
1026 } else {
1027 type = pcap_datalink(pd);
1028 printinfo.printer = lookup_printer(type);
1029 if (printinfo.printer == NULL) {
1030 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1031 if (gndo->ndo_dltname != NULL)
1032 error("unsupported data link type %s",
1033 gndo->ndo_dltname);
1034 else
1035 error("unsupported data link type %d", type);
1036 }
1037 callback = print_packet;
1038 pcap_userdata = (u_char *)&printinfo;
1039 }
1040 #ifndef WIN32
1041 /*
1042 * We cannot do this earlier, because we want to be able to open
1043 * the file (if done) for writing before giving up permissions.
1044 */
1045 if (getuid() == 0 || geteuid() == 0) {
1046 if (username || chroot_dir)
1047 droproot(username, chroot_dir);
1048 }
1049 #endif /* WIN32 */
1050 #ifdef SIGINFO
1051 (void)setsignal(SIGINFO, requestinfo);
1052 #endif
1053
1054 if (vflag > 0 && WFileName) {
1055 /*
1056 * When capturing to a file, "-v" means tcpdump should,
1057 * every 10 secodns, "v"erbosely report the number of
1058 * packets captured.
1059 */
1060 #ifdef USE_WIN32_MM_TIMER
1061 /* call verbose_stats_dump() each 1000 +/-100msec */
1062 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1063 setvbuf(stderr, NULL, _IONBF, 0);
1064 #elif defined(HAVE_ALARM)
1065 (void)setsignal(SIGALRM, verbose_stats_dump);
1066 alarm(1);
1067 #endif
1068 }
1069
1070 #ifndef WIN32
1071 if (RFileName == NULL) {
1072 int dlt;
1073 const char *dlt_name;
1074
1075 if (!vflag && !WFileName) {
1076 (void)fprintf(stderr,
1077 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1078 program_name);
1079 } else
1080 (void)fprintf(stderr, "%s: ", program_name);
1081 dlt = pcap_datalink(pd);
1082 dlt_name = pcap_datalink_val_to_name(dlt);
1083 if (dlt_name == NULL) {
1084 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1085 device, dlt, snaplen);
1086 } else {
1087 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1088 device, dlt_name,
1089 pcap_datalink_val_to_description(dlt), snaplen);
1090 }
1091 (void)fflush(stderr);
1092 }
1093 #endif /* WIN32 */
1094 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1095 if (WFileName == NULL) {
1096 /*
1097 * We're printing packets. Flush the printed output,
1098 * so it doesn't get intermingled with error output.
1099 */
1100 if (status == -2) {
1101 /*
1102 * We got interrupted, so perhaps we didn't
1103 * manage to finish a line we were printing.
1104 * Print an extra newline, just in case.
1105 */
1106 putchar('\n');
1107 }
1108 (void)fflush(stdout);
1109 }
1110 if (status == -1) {
1111 /*
1112 * Error. Report it.
1113 */
1114 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1115 program_name, pcap_geterr(pd));
1116 }
1117 if (RFileName == NULL) {
1118 /*
1119 * We're doing a live capture. Report the capture
1120 * statistics.
1121 */
1122 info(1);
1123 }
1124 pcap_close(pd);
1125 exit(status == -1 ? 1 : 0);
1126 }
1127
1128 /* make a clean exit on interrupts */
1129 static RETSIGTYPE
1130 cleanup(int signo _U_)
1131 {
1132 #ifdef USE_WIN32_MM_TIMER
1133 if (timer_id)
1134 timeKillEvent(timer_id);
1135 timer_id = 0;
1136 #elif defined(HAVE_ALARM)
1137 alarm(0);
1138 #endif
1139
1140 #ifdef HAVE_PCAP_BREAKLOOP
1141 /*
1142 * We have "pcap_breakloop()"; use it, so that we do as little
1143 * as possible in the signal handler (it's probably not safe
1144 * to do anything with standard I/O streams in a signal handler -
1145 * the ANSI C standard doesn't say it is).
1146 */
1147 pcap_breakloop(pd);
1148 #else
1149 /*
1150 * We don't have "pcap_breakloop()"; this isn't safe, but
1151 * it's the best we can do. Print the summary if we're
1152 * not reading from a savefile - i.e., if we're doing a
1153 * live capture - and exit.
1154 */
1155 if (pd != NULL && pcap_file(pd) == NULL) {
1156 /*
1157 * We got interrupted, so perhaps we didn't
1158 * manage to finish a line we were printing.
1159 * Print an extra newline, just in case.
1160 */
1161 putchar('\n');
1162 (void)fflush(stdout);
1163 info(1);
1164 }
1165 exit(0);
1166 #endif
1167 }
1168
1169 static void
1170 info(register int verbose)
1171 {
1172 struct pcap_stat stat;
1173
1174 if (pcap_stats(pd, &stat) < 0) {
1175 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1176 return;
1177 }
1178
1179 if (!verbose)
1180 fprintf(stderr, "%s: ", program_name);
1181
1182 (void)fprintf(stderr, "%u packets captured", packets_captured);
1183 if (!verbose)
1184 fputs(", ", stderr);
1185 else
1186 putc('\n', stderr);
1187 (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1188 if (!verbose)
1189 fputs(", ", stderr);
1190 else
1191 putc('\n', stderr);
1192 (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1193 infoprint = 0;
1194 }
1195
1196 static void
1197 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1198 {
1199 struct dump_info *dump_info;
1200 char *name;
1201
1202 ++packets_captured;
1203
1204 ++infodelay;
1205
1206 dump_info = (struct dump_info *)user;
1207
1208 /*
1209 * XXX - this won't force the file to rotate on the specified time
1210 * boundary, but it will rotate on the first packet received after the
1211 * specified Gflag number of seconds. Note: if a Gflag time boundary
1212 * and a Cflag size boundary coincide, the time rotation will occur
1213 * first thereby cancelling the Cflag boundary (since the file should
1214 * be 0).
1215 */
1216 if (Gflag != 0) {
1217 /* Check if it is time to rotate */
1218 time_t t;
1219
1220 /* Get the current time */
1221 if ((t = time(NULL)) == (time_t)-1) {
1222 error("dump_and_trunc_packet: can't get current_time: %s",
1223 pcap_strerror(errno));
1224 }
1225
1226
1227 /* If the time is greater than the specified window, rotate */
1228 if (t - Gflag_time >= Gflag) {
1229 /* Update the Gflag_time */
1230 Gflag_time = t;
1231 /* Update Gflag_count */
1232 Gflag_count++;
1233 /*
1234 * Close the current file and open a new one.
1235 */
1236 pcap_dump_close(dump_info->p);
1237
1238 /*
1239 * Check to see if we've exceeded the Wflag (when
1240 * not using Cflag).
1241 */
1242 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1243 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1244 Wflag);
1245 exit(0);
1246 /* NOTREACHED */
1247 }
1248 /* Allocate space for max filename + \0. */
1249 name = (char *)malloc(NAME_MAX + 1);
1250 if (name == NULL)
1251 error("dump_packet_and_trunc: malloc");
1252 /*
1253 * This is always the first file in the Cflag
1254 * rotation: e.g. 0
1255 * We also don't need numbering if Cflag is not set.
1256 */
1257 if (Cflag != 0)
1258 MakeFilename(name, dump_info->WFileName, 0,
1259 WflagChars);
1260 else
1261 MakeFilename(name, dump_info->WFileName, 0, 0);
1262
1263 dump_info->p = pcap_dump_open(dump_info->pd, name);
1264 free(name);
1265 if (dump_info->p == NULL)
1266 error("%s", pcap_geterr(pd));
1267 }
1268 }
1269
1270 /*
1271 * XXX - this won't prevent capture files from getting
1272 * larger than Cflag - the last packet written to the
1273 * file could put it over Cflag.
1274 */
1275 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1276 /*
1277 * Close the current file and open a new one.
1278 */
1279 pcap_dump_close(dump_info->p);
1280 Cflag_count++;
1281 if (Wflag > 0) {
1282 if (Cflag_count >= Wflag)
1283 Cflag_count = 0;
1284 }
1285 name = (char *)malloc(NAME_MAX + 1);
1286 if (name == NULL)
1287 error("dump_packet_and_trunc: malloc");
1288 MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1289 dump_info->p = pcap_dump_open(dump_info->pd, name);
1290 free(name);
1291 if (dump_info->p == NULL)
1292 error("%s", pcap_geterr(pd));
1293 }
1294
1295 pcap_dump((u_char *)dump_info->p, h, sp);
1296 #ifdef HAVE_PCAP_DUMP_FLUSH
1297 if (Uflag)
1298 pcap_dump_flush(dump_info->p);
1299 #endif
1300
1301 --infodelay;
1302 if (infoprint)
1303 info(0);
1304 }
1305
1306 static void
1307 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1308 {
1309 ++packets_captured;
1310
1311 ++infodelay;
1312
1313 pcap_dump(user, h, sp);
1314 #ifdef HAVE_PCAP_DUMP_FLUSH
1315 if (Uflag)
1316 pcap_dump_flush((pcap_dumper_t *)user);
1317 #endif
1318
1319 --infodelay;
1320 if (infoprint)
1321 info(0);
1322 }
1323
1324 static void
1325 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1326 {
1327 struct print_info *print_info;
1328 u_int hdrlen;
1329
1330 ++packets_captured;
1331
1332 ++infodelay;
1333 ts_print(&h->ts);
1334
1335 print_info = (struct print_info *)user;
1336
1337 /*
1338 * Some printers want to check that they're not walking off the
1339 * end of the packet.
1340 * Rather than pass it all the way down, we set this global.
1341 */
1342 snapend = sp + h->caplen;
1343
1344 hdrlen = (*print_info->printer)(h, sp);
1345 if (Xflag) {
1346 /*
1347 * Print the raw packet data in hex and ASCII.
1348 */
1349 if (Xflag > 1) {
1350 /*
1351 * Include the link-layer header.
1352 */
1353 hex_and_ascii_print("\n\t", sp, h->caplen);
1354 } else {
1355 /*
1356 * Don't include the link-layer header - and if
1357 * we have nothing past the link-layer header,
1358 * print nothing.
1359 */
1360 if (h->caplen > hdrlen)
1361 hex_and_ascii_print("\n\t", sp + hdrlen,
1362 h->caplen - hdrlen);
1363 }
1364 } else if (xflag) {
1365 /*
1366 * Print the raw packet data in hex.
1367 */
1368 if (xflag > 1) {
1369 /*
1370 * Include the link-layer header.
1371 */
1372 hex_print("\n\t", sp, h->caplen);
1373 } else {
1374 /*
1375 * Don't include the link-layer header - and if
1376 * we have nothing past the link-layer header,
1377 * print nothing.
1378 */
1379 if (h->caplen > hdrlen)
1380 hex_print("\n\t", sp + hdrlen,
1381 h->caplen - hdrlen);
1382 }
1383 } else if (Aflag) {
1384 /*
1385 * Print the raw packet data in ASCII.
1386 */
1387 if (Aflag > 1) {
1388 /*
1389 * Include the link-layer header.
1390 */
1391 ascii_print(sp, h->caplen);
1392 } else {
1393 /*
1394 * Don't include the link-layer header - and if
1395 * we have nothing past the link-layer header,
1396 * print nothing.
1397 */
1398 if (h->caplen > hdrlen)
1399 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1400 }
1401 }
1402
1403 putchar('\n');
1404
1405 --infodelay;
1406 if (infoprint)
1407 info(0);
1408 }
1409
1410 #ifdef WIN32
1411 /*
1412 * XXX - there should really be libpcap calls to get the version
1413 * number as a string (the string would be generated from #defines
1414 * at run time, so that it's not generated from string constants
1415 * in the library, as, on many UNIX systems, those constants would
1416 * be statically linked into the application executable image, and
1417 * would thus reflect the version of libpcap on the system on
1418 * which the application was *linked*, not the system on which it's
1419 * *running*.
1420 *
1421 * That routine should be documented, unlike the "version[]"
1422 * string, so that UNIX vendors providing their own libpcaps
1423 * don't omit it (as a couple of vendors have...).
1424 *
1425 * Packet.dll should perhaps also export a routine to return the
1426 * version number of the Packet.dll code, to supply the
1427 * "Wpcap_version" information on Windows.
1428 */
1429 char WDversion[]="current-cvs.tcpdump.org";
1430 #if !defined(HAVE_GENERATED_VERSION)
1431 char version[]="current-cvs.tcpdump.org";
1432 #endif
1433 char pcap_version[]="current-cvs.tcpdump.org";
1434 char Wpcap_version[]="3.1";
1435 #endif
1436
1437 /*
1438 * By default, print the specified data out in hex and ASCII.
1439 */
1440 static void
1441 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1442 {
1443 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1444 }
1445
1446 void
1447 default_print(const u_char *bp, u_int length)
1448 {
1449 ndo_default_print(gndo, bp, length);
1450 }
1451
1452 #ifdef SIGINFO
1453 RETSIGTYPE requestinfo(int signo _U_)
1454 {
1455 if (infodelay)
1456 ++infoprint;
1457 else
1458 info(0);
1459 }
1460 #endif
1461
1462 /*
1463 * Called once each second in verbose mode while dumping to file
1464 */
1465 #ifdef USE_WIN32_MM_TIMER
1466 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1467 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1468 {
1469 struct pcap_stat stat;
1470
1471 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1472 fprintf(stderr, "Got %u\r", packets_captured);
1473 }
1474 #elif defined(HAVE_ALARM)
1475 static void verbose_stats_dump(int sig _U_)
1476 {
1477 struct pcap_stat stat;
1478
1479 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1480 fprintf(stderr, "Got %u\r", packets_captured);
1481 alarm(1);
1482 }
1483 #endif
1484
1485 static void
1486 usage(void)
1487 {
1488 extern char version[];
1489 #ifndef HAVE_PCAP_LIB_VERSION
1490 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1491 extern char pcap_version[];
1492 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1493 static char pcap_version[] = "unknown";
1494 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1495 #endif /* HAVE_PCAP_LIB_VERSION */
1496
1497 #ifdef HAVE_PCAP_LIB_VERSION
1498 #ifdef WIN32
1499 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1500 #else /* WIN32 */
1501 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1502 #endif /* WIN32 */
1503 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1504 #else /* HAVE_PCAP_LIB_VERSION */
1505 #ifdef WIN32
1506 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1507 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1508 #else /* WIN32 */
1509 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1510 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1511 #endif /* WIN32 */
1512 #endif /* HAVE_PCAP_LIB_VERSION */
1513 (void)fprintf(stderr,
1514 "Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1515 (void)fprintf(stderr,
1516 "\t\t[ -E algo:secret ] [ -F file ] [ -G seconds ] [ -i interface ]\n");
1517 (void)fprintf(stderr,
1518 "\t\t[ -M secret ] [ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1519 (void)fprintf(stderr,
1520 "\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1521 (void)fprintf(stderr,
1522 "\t\t[ expression ]\n");
1523 exit(1);
1524 }
1525
1526
1527
1528 /* VARARGS */
1529 static void
1530 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1531 {
1532 va_list ap;
1533
1534 (void)fprintf(stderr, "%s: ", program_name);
1535 va_start(ap, fmt);
1536 (void)vfprintf(stderr, fmt, ap);
1537 va_end(ap);
1538 if (*fmt) {
1539 fmt += strlen(fmt);
1540 if (fmt[-1] != '\n')
1541 (void)fputc('\n', stderr);
1542 }
1543 exit(1);
1544 /* NOTREACHED */
1545 }
1546
1547 /* VARARGS */
1548 static void
1549 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1550 {
1551 va_list ap;
1552
1553 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1554 va_start(ap, fmt);
1555 (void)vfprintf(stderr, fmt, ap);
1556 va_end(ap);
1557 if (*fmt) {
1558 fmt += strlen(fmt);
1559 if (fmt[-1] != '\n')
1560 (void)fputc('\n', stderr);
1561 }
1562 }
1563
[mirror] the TCPdump network dissector