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Add a -h flag, and only attempt to recognize 802.11s mesh headers if it's set.
[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 1.283 2008-09-25 21:45:50 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 #include <limits.h>
69 #ifndef WIN32
70 #include <sys/wait.h>
71 #include <sys/resource.h>
72 #include <pwd.h>
73 #include <grp.h>
74 #include <errno.h>
75 #endif /* WIN32 */
76
77
78 #include "netdissect.h"
79 #include "interface.h"
80 #include "addrtoname.h"
81 #include "machdep.h"
82 #include "setsignal.h"
83 #include "gmt2local.h"
84 #include "pcap-missing.h"
85
86 #ifndef NAME_MAX
87 #define NAME_MAX 255
88 #endif
89
90 netdissect_options Gndo;
91 netdissect_options *gndo = &Gndo;
92
93 static int dflag; /* print filter code */
94 static int Lflag; /* list available data link types and exit */
95 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
96
97 static int infodelay;
98 static int infoprint;
99
100 char *program_name;
101
102 int32_t thiszone; /* seconds offset from gmt to local time */
103
104 /* Forwards */
105 static RETSIGTYPE cleanup(int);
106 static RETSIGTYPE child_cleanup(int);
107 static void usage(void) __attribute__((noreturn));
108 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
109
110 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
111 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
112 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
113 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
114 static void droproot(const char *, const char *);
115 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
116 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
117
118 #ifdef SIGINFO
119 RETSIGTYPE requestinfo(int);
120 #endif
121
122 #if defined(USE_WIN32_MM_TIMER)
123 #include <MMsystem.h>
124 static UINT timer_id;
125 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
126 #elif defined(HAVE_ALARM)
127 static void verbose_stats_dump(int sig);
128 #endif
129
130 static void info(int);
131 static u_int packets_captured;
132
133 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
134 typedef u_int (*if_ndo_printer)(struct netdissect_options *ndo,
135 const struct pcap_pkthdr *, const u_char *);
136
137 struct printer {
138 if_printer f;
139 int type;
140 };
141
142
143 struct ndo_printer {
144 if_ndo_printer f;
145 int type;
146 };
147
148
149 static struct printer printers[] = {
150 { arcnet_if_print, DLT_ARCNET },
151 #ifdef DLT_ARCNET_LINUX
152 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
153 #endif
154 { ether_if_print, DLT_EN10MB },
155 { token_if_print, DLT_IEEE802 },
156 #ifdef DLT_LANE8023
157 { lane_if_print, DLT_LANE8023 },
158 #endif
159 #ifdef DLT_CIP
160 { cip_if_print, DLT_CIP },
161 #endif
162 #ifdef DLT_ATM_CLIP
163 { cip_if_print, DLT_ATM_CLIP },
164 #endif
165 { sl_if_print, DLT_SLIP },
166 #ifdef DLT_SLIP_BSDOS
167 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
168 #endif
169 { ppp_if_print, DLT_PPP },
170 #ifdef DLT_PPP_WITHDIRECTION
171 { ppp_if_print, DLT_PPP_WITHDIRECTION },
172 #endif
173 #ifdef DLT_PPP_BSDOS
174 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
175 #endif
176 { fddi_if_print, DLT_FDDI },
177 { null_if_print, DLT_NULL },
178 #ifdef DLT_LOOP
179 { null_if_print, DLT_LOOP },
180 #endif
181 { raw_if_print, DLT_RAW },
182 { atm_if_print, DLT_ATM_RFC1483 },
183 #ifdef DLT_C_HDLC
184 { chdlc_if_print, DLT_C_HDLC },
185 #endif
186 #ifdef DLT_HDLC
187 { chdlc_if_print, DLT_HDLC },
188 #endif
189 #ifdef DLT_PPP_SERIAL
190 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
191 #endif
192 #ifdef DLT_PPP_ETHER
193 { pppoe_if_print, DLT_PPP_ETHER },
194 #endif
195 #ifdef DLT_LINUX_SLL
196 { sll_if_print, DLT_LINUX_SLL },
197 #endif
198 #ifdef DLT_IEEE802_11
199 { ieee802_11_if_print, DLT_IEEE802_11},
200 #endif
201 #ifdef DLT_LTALK
202 { ltalk_if_print, DLT_LTALK },
203 #endif
204 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
205 { pflog_if_print, DLT_PFLOG },
206 #endif
207 #ifdef DLT_FR
208 { fr_if_print, DLT_FR },
209 #endif
210 #ifdef DLT_FRELAY
211 { fr_if_print, DLT_FRELAY },
212 #endif
213 #ifdef DLT_SUNATM
214 { sunatm_if_print, DLT_SUNATM },
215 #endif
216 #ifdef DLT_IP_OVER_FC
217 { ipfc_if_print, DLT_IP_OVER_FC },
218 #endif
219 #ifdef DLT_PRISM_HEADER
220 { prism_if_print, DLT_PRISM_HEADER },
221 #endif
222 #ifdef DLT_IEEE802_11_RADIO
223 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
224 #endif
225 #ifdef DLT_ENC
226 { enc_if_print, DLT_ENC },
227 #endif
228 #ifdef DLT_SYMANTEC_FIREWALL
229 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
230 #endif
231 #ifdef DLT_APPLE_IP_OVER_IEEE1394
232 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
233 #endif
234 #ifdef DLT_IEEE802_11_RADIO_AVS
235 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
236 #endif
237 #ifdef DLT_JUNIPER_ATM1
238 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
239 #endif
240 #ifdef DLT_JUNIPER_ATM2
241 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
242 #endif
243 #ifdef DLT_JUNIPER_MFR
244 { juniper_mfr_print, DLT_JUNIPER_MFR },
245 #endif
246 #ifdef DLT_JUNIPER_MLFR
247 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
248 #endif
249 #ifdef DLT_JUNIPER_MLPPP
250 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
251 #endif
252 #ifdef DLT_JUNIPER_PPPOE
253 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
254 #endif
255 #ifdef DLT_JUNIPER_PPPOE_ATM
256 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
257 #endif
258 #ifdef DLT_JUNIPER_GGSN
259 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
260 #endif
261 #ifdef DLT_JUNIPER_ES
262 { juniper_es_print, DLT_JUNIPER_ES },
263 #endif
264 #ifdef DLT_JUNIPER_MONITOR
265 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
266 #endif
267 #ifdef DLT_JUNIPER_SERVICES
268 { juniper_services_print, DLT_JUNIPER_SERVICES },
269 #endif
270 #ifdef DLT_JUNIPER_ETHER
271 { juniper_ether_print, DLT_JUNIPER_ETHER },
272 #endif
273 #ifdef DLT_JUNIPER_PPP
274 { juniper_ppp_print, DLT_JUNIPER_PPP },
275 #endif
276 #ifdef DLT_JUNIPER_FRELAY
277 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
278 #endif
279 #ifdef DLT_JUNIPER_CHDLC
280 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
281 #endif
282 #ifdef DLT_MFR
283 { mfr_if_print, DLT_MFR },
284 #endif
285 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
286 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
287 #endif
288 #ifdef HAVE_PCAP_USB_H
289 #ifdef DLT_USB_LINUX
290 { usb_linux_48_byte_print, DLT_USB_LINUX},
291 #endif /* DLT_USB_LINUX */
292 #ifdef DLT_USB_LINUX_MMAPPED
293 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
294 #endif /* DLT_USB_LINUX_MMAPPED */
295 #endif /* HAVE_PCAP_USB_H */
296 #ifdef DLT_IPV4
297 { raw_if_print, DLT_IPV4 },
298 #endif
299 #ifdef DLT_IPV6
300 { raw_if_print, DLT_IPV6 },
301 #endif
302 { NULL, 0 },
303 };
304
305 static struct ndo_printer ndo_printers[] = {
306 #ifdef DLT_IPNET
307 { ipnet_if_print, DLT_IPNET },
308 #endif
309 #ifdef DLT_IEEE802_15_4
310 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
311 #endif
312 { NULL, 0 },
313 };
314
315 static if_printer
316 lookup_printer(int type)
317 {
318 struct printer *p;
319
320 for (p = printers; p->f; ++p)
321 if (type == p->type)
322 return p->f;
323
324 return NULL;
325 /* NOTREACHED */
326 }
327
328 static if_ndo_printer
329 lookup_ndo_printer(int type)
330 {
331 struct ndo_printer *p;
332
333 for (p = ndo_printers; p->f; ++p)
334 if (type == p->type)
335 return p->f;
336
337 return NULL;
338 /* NOTREACHED */
339 }
340
341 static pcap_t *pd;
342
343 static int supports_monitor_mode;
344
345 extern int optind;
346 extern int opterr;
347 extern char *optarg;
348
349 struct print_info {
350 netdissect_options *ndo;
351 union {
352 if_printer printer;
353 if_ndo_printer ndo_printer;
354 } p;
355 int ndo_type;
356 };
357
358 struct dump_info {
359 char *WFileName;
360 char *CurrentFileName;
361 pcap_t *pd;
362 pcap_dumper_t *p;
363 };
364
365 static void
366 show_dlts_and_exit(const char *device, pcap_t *pd)
367 {
368 int n_dlts;
369 int *dlts = 0;
370 const char *dlt_name;
371
372 n_dlts = pcap_list_datalinks(pd, &dlts);
373 if (n_dlts < 0)
374 error("%s", pcap_geterr(pd));
375 else if (n_dlts == 0 || !dlts)
376 error("No data link types.");
377
378 /*
379 * If the interface is known to support monitor mode, indicate
380 * whether these are the data link types available when not in
381 * monitor mode, if -I wasn't specified, or when in monitor mode,
382 * when -I was specified (the link-layer types available in
383 * monitor mode might be different from the ones available when
384 * not in monitor mode).
385 */
386 if (supports_monitor_mode)
387 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
388 device,
389 Iflag ? "when in monitor mode" : "when not in monitor mode");
390 else
391 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
392 device);
393
394 while (--n_dlts >= 0) {
395 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
396 if (dlt_name != NULL) {
397 (void) fprintf(stderr, " %s (%s)", dlt_name,
398 pcap_datalink_val_to_description(dlts[n_dlts]));
399
400 /*
401 * OK, does tcpdump handle that type?
402 */
403 if (lookup_printer(dlts[n_dlts]) == NULL
404 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
405 (void) fprintf(stderr, " (printing not supported)");
406 fprintf(stderr, "\n");
407 } else {
408 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
409 dlts[n_dlts]);
410 }
411 }
412 free(dlts);
413 exit(0);
414 }
415
416 /*
417 * Set up flags that might or might not be supported depending on the
418 * version of libpcap we're using.
419 */
420 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
421 #define B_FLAG "B:"
422 #define B_FLAG_USAGE " [ -B size ]"
423 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
424 #define B_FLAG
425 #define B_FLAG_USAGE
426 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
427
428 #ifdef HAVE_PCAP_CREATE
429 #define I_FLAG "I"
430 #else /* HAVE_PCAP_CREATE */
431 #define I_FLAG
432 #endif /* HAVE_PCAP_CREATE */
433
434 #ifdef HAVE_PCAP_FINDALLDEVS
435 #ifndef HAVE_PCAP_IF_T
436 #undef HAVE_PCAP_FINDALLDEVS
437 #endif
438 #endif
439
440 #ifdef HAVE_PCAP_FINDALLDEVS
441 #define D_FLAG "D"
442 #else
443 #define D_FLAG
444 #endif
445
446 #ifdef HAVE_PCAP_DUMP_FLUSH
447 #define U_FLAG "U"
448 #else
449 #define U_FLAG
450 #endif
451
452 #ifndef WIN32
453 /* Drop root privileges and chroot if necessary */
454 static void
455 droproot(const char *username, const char *chroot_dir)
456 {
457 struct passwd *pw = NULL;
458
459 if (chroot_dir && !username) {
460 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
461 exit(1);
462 }
463
464 pw = getpwnam(username);
465 if (pw) {
466 if (chroot_dir) {
467 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
468 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
469 chroot_dir, pcap_strerror(errno));
470 exit(1);
471 }
472 }
473 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
474 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
475 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
476 username,
477 (unsigned long)pw->pw_uid,
478 (unsigned long)pw->pw_gid,
479 pcap_strerror(errno));
480 exit(1);
481 }
482 }
483 else {
484 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
485 username);
486 exit(1);
487 }
488 }
489 #endif /* WIN32 */
490
491 static int
492 getWflagChars(int x)
493 {
494 int c = 0;
495
496 x -= 1;
497 while (x > 0) {
498 c += 1;
499 x /= 10;
500 }
501
502 return c;
503 }
504
505
506 static void
507 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
508 {
509 char *filename = malloc(NAME_MAX + 1);
510
511 /* Process with strftime if Gflag is set. */
512 if (Gflag != 0) {
513 struct tm *local_tm;
514
515 /* Convert Gflag_time to a usable format */
516 if ((local_tm = localtime(&Gflag_time)) == NULL) {
517 error("MakeTimedFilename: localtime");
518 }
519
520 /* There's no good way to detect an error in strftime since a return
521 * value of 0 isn't necessarily failure.
522 */
523 strftime(filename, NAME_MAX, orig_name, local_tm);
524 } else {
525 strncpy(filename, orig_name, NAME_MAX);
526 }
527
528 if (cnt == 0 && max_chars == 0)
529 strncpy(buffer, filename, NAME_MAX + 1);
530 else
531 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
532 /* Report an error if the filename is too large */
533 error("too many output files or filename is too long (> %d)", NAME_MAX);
534 free(filename);
535 }
536
537 static int tcpdump_printf(netdissect_options *ndo _U_,
538 const char *fmt, ...)
539 {
540
541 va_list args;
542 int ret;
543
544 va_start(args, fmt);
545 ret=vfprintf(stdout, fmt, args);
546 va_end(args);
547
548 return ret;
549 }
550
551 int
552 main(int argc, char **argv)
553 {
554 register int cnt, op, i;
555 bpf_u_int32 localnet, netmask;
556 register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
557 pcap_handler callback;
558 int type;
559 struct bpf_program fcode;
560 #ifndef WIN32
561 RETSIGTYPE (*oldhandler)(int);
562 #endif
563 struct print_info printinfo;
564 struct dump_info dumpinfo;
565 u_char *pcap_userdata;
566 char ebuf[PCAP_ERRBUF_SIZE];
567 char *username = NULL;
568 char *chroot_dir = NULL;
569 #ifdef HAVE_PCAP_FINDALLDEVS
570 pcap_if_t *devpointer;
571 int devnum;
572 #endif
573 int status;
574 #ifdef WIN32
575 if(wsockinit() != 0) return 1;
576 #endif /* WIN32 */
577
578 gndo->ndo_Oflag=1;
579 gndo->ndo_Rflag=1;
580 gndo->ndo_dlt=-1;
581 gndo->ndo_default_print=ndo_default_print;
582 gndo->ndo_printf=tcpdump_printf;
583 gndo->ndo_error=ndo_error;
584 gndo->ndo_warning=ndo_warning;
585 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
586
587 cnt = -1;
588 device = NULL;
589 infile = NULL;
590 RFileName = NULL;
591 WFileName = NULL;
592 if ((cp = strrchr(argv[0], '/')) != NULL)
593 program_name = cp + 1;
594 else
595 program_name = argv[0];
596
597 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
598 error("%s", ebuf);
599
600 #ifdef LIBSMI
601 smiInit("tcpdump");
602 #endif
603
604 opterr = 0;
605 while (
606 (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hi:" I_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
607 switch (op) {
608
609 case 'a':
610 /* compatibility for old -a */
611 break;
612
613 case 'A':
614 ++Aflag;
615 break;
616
617 case 'b':
618 ++bflag;
619 break;
620
621 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
622 case 'B':
623 Bflag = atoi(optarg)*1024;
624 if (Bflag <= 0)
625 error("invalid packet buffer size %s", optarg);
626 break;
627 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
628
629 case 'c':
630 cnt = atoi(optarg);
631 if (cnt <= 0)
632 error("invalid packet count %s", optarg);
633 break;
634
635 case 'C':
636 Cflag = atoi(optarg) * 1000000;
637 if (Cflag < 0)
638 error("invalid file size %s", optarg);
639 break;
640
641 case 'd':
642 ++dflag;
643 break;
644
645 #ifdef HAVE_PCAP_FINDALLDEVS
646 case 'D':
647 if (pcap_findalldevs(&devpointer, ebuf) < 0)
648 error("%s", ebuf);
649 else {
650 for (i = 0; devpointer != 0; i++) {
651 printf("%d.%s", i+1, devpointer->name);
652 if (devpointer->description != NULL)
653 printf(" (%s)", devpointer->description);
654 printf("\n");
655 devpointer = devpointer->next;
656 }
657 }
658 return 0;
659 #endif /* HAVE_PCAP_FINDALLDEVS */
660
661 case 'L':
662 Lflag++;
663 break;
664
665 case 'e':
666 ++eflag;
667 break;
668
669 case 'E':
670 #ifndef HAVE_LIBCRYPTO
671 warning("crypto code not compiled in");
672 #endif
673 gndo->ndo_espsecret = optarg;
674 break;
675
676 case 'f':
677 ++fflag;
678 break;
679
680 case 'F':
681 infile = optarg;
682 break;
683
684 case 'G':
685 Gflag = atoi(optarg);
686 if (Gflag < 0)
687 error("invalid number of seconds %s", optarg);
688
689 /* We will create one file initially. */
690 Gflag_count = 0;
691
692 /* Grab the current time for rotation use. */
693 if ((Gflag_time = time(NULL)) == (time_t)-1) {
694 error("main: can't get current time: %s",
695 pcap_strerror(errno));
696 }
697 break;
698
699 case 'h':
700 ++hflag;
701 break;
702
703 case 'i':
704 if (optarg[0] == '0' && optarg[1] == 0)
705 error("Invalid adapter index");
706
707 #ifdef HAVE_PCAP_FINDALLDEVS
708 /*
709 * If the argument is a number, treat it as
710 * an index into the list of adapters, as
711 * printed by "tcpdump -D".
712 *
713 * This should be OK on UNIX systems, as interfaces
714 * shouldn't have names that begin with digits.
715 * It can be useful on Windows, where more than
716 * one interface can have the same name.
717 */
718 if ((devnum = atoi(optarg)) != 0) {
719 if (devnum < 0)
720 error("Invalid adapter index");
721
722 if (pcap_findalldevs(&devpointer, ebuf) < 0)
723 error("%s", ebuf);
724 else {
725 /*
726 * Look for the devnum-th entry
727 * in the list of devices
728 * (1-based).
729 */
730 for (i = 0;
731 i < devnum-1 && devpointer != NULL;
732 i++, devpointer = devpointer->next)
733 ;
734 if (devpointer == NULL)
735 error("Invalid adapter index");
736 }
737 device = devpointer->name;
738 break;
739 }
740 #endif /* HAVE_PCAP_FINDALLDEVS */
741 device = optarg;
742 break;
743
744 #ifdef HAVE_PCAP_CREATE
745 case 'I':
746 ++Iflag;
747 break;
748 #endif /* HAVE_PCAP_CREATE */
749
750 case 'l':
751 #ifdef WIN32
752 /*
753 * _IOLBF is the same as _IOFBF in Microsoft's C
754 * libraries; the only alternative they offer
755 * is _IONBF.
756 *
757 * XXX - this should really be checking for MSVC++,
758 * not WIN32, if, for example, MinGW has its own
759 * C library that is more UNIX-compatible.
760 */
761 setvbuf(stdout, NULL, _IONBF, 0);
762 #else /* WIN32 */
763 #ifdef HAVE_SETLINEBUF
764 setlinebuf(stdout);
765 #else
766 setvbuf(stdout, NULL, _IOLBF, 0);
767 #endif
768 #endif /* WIN32 */
769 break;
770
771 case 'K':
772 ++Kflag;
773 break;
774
775 case 'm':
776 #ifdef LIBSMI
777 if (smiLoadModule(optarg) == 0) {
778 error("could not load MIB module %s", optarg);
779 }
780 sflag = 1;
781 #else
782 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
783 program_name, optarg);
784 (void)fprintf(stderr, "(no libsmi support)\n");
785 #endif
786 break;
787
788 case 'M':
789 /* TCP-MD5 shared secret */
790 #ifndef HAVE_LIBCRYPTO
791 warning("crypto code not compiled in");
792 #endif
793 sigsecret = optarg;
794 break;
795
796 case 'n':
797 ++nflag;
798 break;
799
800 case 'N':
801 ++Nflag;
802 break;
803
804 case 'O':
805 Oflag = 0;
806 break;
807
808 case 'p':
809 ++pflag;
810 break;
811
812 case 'q':
813 ++qflag;
814 ++suppress_default_print;
815 break;
816
817 case 'r':
818 RFileName = optarg;
819 break;
820
821 case 'R':
822 Rflag = 0;
823 break;
824
825 case 's': {
826 char *end;
827
828 snaplen = strtol(optarg, &end, 0);
829 if (optarg == end || *end != '\0'
830 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
831 error("invalid snaplen %s", optarg);
832 else if (snaplen == 0)
833 snaplen = MAXIMUM_SNAPLEN;
834 break;
835 }
836
837 case 'S':
838 ++Sflag;
839 break;
840
841 case 't':
842 ++tflag;
843 break;
844
845 case 'T':
846 if (strcasecmp(optarg, "vat") == 0)
847 packettype = PT_VAT;
848 else if (strcasecmp(optarg, "wb") == 0)
849 packettype = PT_WB;
850 else if (strcasecmp(optarg, "rpc") == 0)
851 packettype = PT_RPC;
852 else if (strcasecmp(optarg, "rtp") == 0)
853 packettype = PT_RTP;
854 else if (strcasecmp(optarg, "rtcp") == 0)
855 packettype = PT_RTCP;
856 else if (strcasecmp(optarg, "snmp") == 0)
857 packettype = PT_SNMP;
858 else if (strcasecmp(optarg, "cnfp") == 0)
859 packettype = PT_CNFP;
860 else if (strcasecmp(optarg, "tftp") == 0)
861 packettype = PT_TFTP;
862 else if (strcasecmp(optarg, "aodv") == 0)
863 packettype = PT_AODV;
864 else
865 error("unknown packet type `%s'", optarg);
866 break;
867
868 case 'u':
869 ++uflag;
870 break;
871
872 #ifdef HAVE_PCAP_DUMP_FLUSH
873 case 'U':
874 ++Uflag;
875 break;
876 #endif
877
878 case 'v':
879 ++vflag;
880 break;
881
882 case 'w':
883 WFileName = optarg;
884 break;
885
886 case 'W':
887 Wflag = atoi(optarg);
888 if (Wflag < 0)
889 error("invalid number of output files %s", optarg);
890 WflagChars = getWflagChars(Wflag);
891 break;
892
893 case 'x':
894 ++xflag;
895 ++suppress_default_print;
896 break;
897
898 case 'X':
899 ++Xflag;
900 ++suppress_default_print;
901 break;
902
903 case 'y':
904 gndo->ndo_dltname = optarg;
905 gndo->ndo_dlt =
906 pcap_datalink_name_to_val(gndo->ndo_dltname);
907 if (gndo->ndo_dlt < 0)
908 error("invalid data link type %s", gndo->ndo_dltname);
909 break;
910
911 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
912 case 'Y':
913 {
914 /* Undocumented flag */
915 #ifdef HAVE_PCAP_DEBUG
916 extern int pcap_debug;
917 pcap_debug = 1;
918 #else
919 extern int yydebug;
920 yydebug = 1;
921 #endif
922 }
923 break;
924 #endif
925 case 'z':
926 if (optarg) {
927 zflag = strdup(optarg);
928 } else {
929 usage();
930 /* NOTREACHED */
931 }
932 break;
933
934 case 'Z':
935 if (optarg) {
936 username = strdup(optarg);
937 }
938 else {
939 usage();
940 /* NOTREACHED */
941 }
942 break;
943
944 default:
945 usage();
946 /* NOTREACHED */
947 }
948
949 switch (tflag) {
950
951 case 0: /* Default */
952 case 4: /* Default + Date*/
953 thiszone = gmt2local(0);
954 break;
955
956 case 1: /* No time stamp */
957 case 2: /* Unix timeval style */
958 case 3: /* Microseconds since previous packet */
959 case 5: /* Microseconds since first packet */
960 break;
961
962 default: /* Not supported */
963 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
964 break;
965 }
966
967 #ifdef WITH_CHROOT
968 /* if run as root, prepare for chrooting */
969 if (getuid() == 0 || geteuid() == 0) {
970 /* future extensibility for cmd-line arguments */
971 if (!chroot_dir)
972 chroot_dir = WITH_CHROOT;
973 }
974 #endif
975
976 #ifdef WITH_USER
977 /* if run as root, prepare for dropping root privileges */
978 if (getuid() == 0 || geteuid() == 0) {
979 /* Run with '-Z root' to restore old behaviour */
980 if (!username)
981 username = WITH_USER;
982 }
983 #endif
984
985 if (RFileName != NULL) {
986 int dlt;
987 const char *dlt_name;
988
989 #ifndef WIN32
990 /*
991 * We don't need network access, so relinquish any set-UID
992 * or set-GID privileges we have (if any).
993 *
994 * We do *not* want set-UID privileges when opening a
995 * trace file, as that might let the user read other
996 * people's trace files (especially if we're set-UID
997 * root).
998 */
999 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1000 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1001 #endif /* WIN32 */
1002 pd = pcap_open_offline(RFileName, ebuf);
1003 if (pd == NULL)
1004 error("%s", ebuf);
1005 dlt = pcap_datalink(pd);
1006 dlt_name = pcap_datalink_val_to_name(dlt);
1007 if (dlt_name == NULL) {
1008 fprintf(stderr, "reading from file %s, link-type %u\n",
1009 RFileName, dlt);
1010 } else {
1011 fprintf(stderr,
1012 "reading from file %s, link-type %s (%s)\n",
1013 RFileName, dlt_name,
1014 pcap_datalink_val_to_description(dlt));
1015 }
1016 localnet = 0;
1017 netmask = 0;
1018 if (fflag != 0)
1019 error("-f and -r options are incompatible");
1020 } else {
1021 if (device == NULL) {
1022 device = pcap_lookupdev(ebuf);
1023 if (device == NULL)
1024 error("%s", ebuf);
1025 }
1026 #ifdef WIN32
1027 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1028 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1029 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1030 }
1031 else
1032 {
1033 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1034 }
1035
1036 fflush(stderr);
1037 #endif /* WIN32 */
1038 #ifdef HAVE_PCAP_CREATE
1039 pd = pcap_create(device, ebuf);
1040 if (pd == NULL)
1041 error("%s", ebuf);
1042 /*
1043 * Is this an interface that supports monitor mode?
1044 */
1045 if (pcap_can_set_rfmon(pd) == 1)
1046 supports_monitor_mode = 1;
1047 else
1048 supports_monitor_mode = 0;
1049 status = pcap_set_snaplen(pd, snaplen);
1050 if (status != 0)
1051 error("%s: pcap_set_snaplen failed: %s",
1052 device, pcap_statustostr(status));
1053 status = pcap_set_promisc(pd, !pflag);
1054 if (status != 0)
1055 error("%s: pcap_set_promisc failed: %s",
1056 device, pcap_statustostr(status));
1057 if (Iflag) {
1058 status = pcap_set_rfmon(pd, 1);
1059 if (status != 0)
1060 error("%s: pcap_set_rfmon failed: %s",
1061 device, pcap_statustostr(status));
1062 }
1063 status = pcap_set_timeout(pd, 1000);
1064 if (status != 0)
1065 error("%s: pcap_set_timeout failed: %s",
1066 device, pcap_statustostr(status));
1067 if (Bflag != 0) {
1068 status = pcap_set_buffer_size(pd, Bflag);
1069 if (status != 0)
1070 error("%s: pcap_set_buffer_size failed: %s",
1071 device, pcap_statustostr(status));
1072 }
1073 status = pcap_activate(pd);
1074 if (status < 0) {
1075 /*
1076 * pcap_activate() failed.
1077 */
1078 cp = pcap_geterr(pd);
1079 if (status == PCAP_ERROR)
1080 error("%s", cp);
1081 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1082 status == PCAP_ERROR_PERM_DENIED) &&
1083 *cp != '\0')
1084 error("%s: %s\n(%s)", device,
1085 pcap_statustostr(status), cp);
1086 else
1087 error("%s: %s", device,
1088 pcap_statustostr(status));
1089 } else if (status > 0) {
1090 /*
1091 * pcap_activate() succeeded, but it's warning us
1092 * of a problem it had.
1093 */
1094 cp = pcap_geterr(pd);
1095 if (status == PCAP_WARNING)
1096 warning("%s", cp);
1097 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1098 *cp != '\0')
1099 warning("%s: %s\n(%s)", device,
1100 pcap_statustostr(status), cp);
1101 else
1102 warning("%s: %s", device,
1103 pcap_statustostr(status));
1104 }
1105 #else
1106 *ebuf = '\0';
1107 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1108 if (pd == NULL)
1109 error("%s", ebuf);
1110 else if (*ebuf)
1111 warning("%s", ebuf);
1112 #endif /* HAVE_PCAP_CREATE */
1113 /*
1114 * Let user own process after socket has been opened.
1115 */
1116 #ifndef WIN32
1117 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1118 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1119 #endif /* WIN32 */
1120 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1121 if(Bflag != 0)
1122 if(pcap_setbuff(pd, Bflag)==-1){
1123 error("%s", pcap_geterr(pd));
1124 }
1125 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1126 if (Lflag)
1127 show_dlts_and_exit(device, pd);
1128 if (gndo->ndo_dlt >= 0) {
1129 #ifdef HAVE_PCAP_SET_DATALINK
1130 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1131 error("%s", pcap_geterr(pd));
1132 #else
1133 /*
1134 * We don't actually support changing the
1135 * data link type, so we only let them
1136 * set it to what it already is.
1137 */
1138 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1139 error("%s is not one of the DLTs supported by this device\n",
1140 gndo->ndo_dltname);
1141 }
1142 #endif
1143 (void)fprintf(stderr, "%s: data link type %s\n",
1144 program_name, gndo->ndo_dltname);
1145 (void)fflush(stderr);
1146 }
1147 i = pcap_snapshot(pd);
1148 if (snaplen < i) {
1149 warning("snaplen raised from %d to %d", snaplen, i);
1150 snaplen = i;
1151 }
1152 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1153 localnet = 0;
1154 netmask = 0;
1155 warning("%s", ebuf);
1156 }
1157 }
1158 if (infile)
1159 cmdbuf = read_infile(infile);
1160 else
1161 cmdbuf = copy_argv(&argv[optind]);
1162
1163 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1164 error("%s", pcap_geterr(pd));
1165 free(cmdbuf);
1166 if (dflag) {
1167 bpf_dump(&fcode, dflag);
1168 pcap_close(pd);
1169 exit(0);
1170 }
1171 init_addrtoname(localnet, netmask);
1172 init_checksum();
1173
1174 #ifndef WIN32
1175 (void)setsignal(SIGPIPE, cleanup);
1176 (void)setsignal(SIGTERM, cleanup);
1177 (void)setsignal(SIGINT, cleanup);
1178 (void)setsignal(SIGCHLD, child_cleanup);
1179 #endif /* WIN32 */
1180 /* Cooperate with nohup(1) */
1181 #ifndef WIN32
1182 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1183 (void)setsignal(SIGHUP, oldhandler);
1184 #endif /* WIN32 */
1185
1186 if (pcap_setfilter(pd, &fcode) < 0)
1187 error("%s", pcap_geterr(pd));
1188 if (WFileName) {
1189 pcap_dumper_t *p;
1190 /* Do not exceed the default NAME_MAX for files. */
1191 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1192
1193 if (dumpinfo.CurrentFileName == NULL)
1194 error("malloc of dumpinfo.CurrentFileName");
1195
1196 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1197 if (Cflag != 0)
1198 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1199 else
1200 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1201
1202 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1203 if (p == NULL)
1204 error("%s", pcap_geterr(pd));
1205 if (Cflag != 0 || Gflag != 0) {
1206 callback = dump_packet_and_trunc;
1207 dumpinfo.WFileName = WFileName;
1208 dumpinfo.pd = pd;
1209 dumpinfo.p = p;
1210 pcap_userdata = (u_char *)&dumpinfo;
1211 } else {
1212 callback = dump_packet;
1213 pcap_userdata = (u_char *)p;
1214 }
1215 } else {
1216 type = pcap_datalink(pd);
1217 printinfo.ndo_type = 1;
1218 printinfo.ndo = gndo;
1219 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1220 if (printinfo.p.ndo_printer == NULL) {
1221 printinfo.p.printer = lookup_printer(type);
1222 printinfo.ndo_type = 0;
1223 if (printinfo.p.printer == NULL) {
1224 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1225 if (gndo->ndo_dltname != NULL)
1226 error("packet printing is not supported for link type %s: use -w",
1227 gndo->ndo_dltname);
1228 else
1229 error("packet printing is not supported for link type %d: use -w", type);
1230 }
1231 }
1232 callback = print_packet;
1233 pcap_userdata = (u_char *)&printinfo;
1234 }
1235 #ifndef WIN32
1236 /*
1237 * We cannot do this earlier, because we want to be able to open
1238 * the file (if done) for writing before giving up permissions.
1239 */
1240 if (getuid() == 0 || geteuid() == 0) {
1241 if (username || chroot_dir)
1242 droproot(username, chroot_dir);
1243 }
1244 #endif /* WIN32 */
1245 #ifdef SIGINFO
1246 /*
1247 * We can't get statistics when reading from a file rather
1248 * than capturing from a device.
1249 */
1250 if (RFileName == NULL)
1251 (void)setsignal(SIGINFO, requestinfo);
1252 #endif
1253
1254 if (vflag > 0 && WFileName) {
1255 /*
1256 * When capturing to a file, "-v" means tcpdump should,
1257 * every 10 secodns, "v"erbosely report the number of
1258 * packets captured.
1259 */
1260 #ifdef USE_WIN32_MM_TIMER
1261 /* call verbose_stats_dump() each 1000 +/-100msec */
1262 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1263 setvbuf(stderr, NULL, _IONBF, 0);
1264 #elif defined(HAVE_ALARM)
1265 (void)setsignal(SIGALRM, verbose_stats_dump);
1266 alarm(1);
1267 #endif
1268 }
1269
1270 #ifndef WIN32
1271 if (RFileName == NULL) {
1272 int dlt;
1273 const char *dlt_name;
1274
1275 if (!vflag && !WFileName) {
1276 (void)fprintf(stderr,
1277 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1278 program_name);
1279 } else
1280 (void)fprintf(stderr, "%s: ", program_name);
1281 dlt = pcap_datalink(pd);
1282 dlt_name = pcap_datalink_val_to_name(dlt);
1283 if (dlt_name == NULL) {
1284 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1285 device, dlt, snaplen);
1286 } else {
1287 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1288 device, dlt_name,
1289 pcap_datalink_val_to_description(dlt), snaplen);
1290 }
1291 (void)fflush(stderr);
1292 }
1293 #endif /* WIN32 */
1294 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1295 if (WFileName == NULL) {
1296 /*
1297 * We're printing packets. Flush the printed output,
1298 * so it doesn't get intermingled with error output.
1299 */
1300 if (status == -2) {
1301 /*
1302 * We got interrupted, so perhaps we didn't
1303 * manage to finish a line we were printing.
1304 * Print an extra newline, just in case.
1305 */
1306 putchar('\n');
1307 }
1308 (void)fflush(stdout);
1309 }
1310 if (status == -1) {
1311 /*
1312 * Error. Report it.
1313 */
1314 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1315 program_name, pcap_geterr(pd));
1316 }
1317 if (RFileName == NULL) {
1318 /*
1319 * We're doing a live capture. Report the capture
1320 * statistics.
1321 */
1322 info(1);
1323 }
1324 pcap_close(pd);
1325 exit(status == -1 ? 1 : 0);
1326 }
1327
1328 /* make a clean exit on interrupts */
1329 static RETSIGTYPE
1330 cleanup(int signo _U_)
1331 {
1332 #ifdef USE_WIN32_MM_TIMER
1333 if (timer_id)
1334 timeKillEvent(timer_id);
1335 timer_id = 0;
1336 #elif defined(HAVE_ALARM)
1337 alarm(0);
1338 #endif
1339
1340 #ifdef HAVE_PCAP_BREAKLOOP
1341 /*
1342 * We have "pcap_breakloop()"; use it, so that we do as little
1343 * as possible in the signal handler (it's probably not safe
1344 * to do anything with standard I/O streams in a signal handler -
1345 * the ANSI C standard doesn't say it is).
1346 */
1347 pcap_breakloop(pd);
1348 #else
1349 /*
1350 * We don't have "pcap_breakloop()"; this isn't safe, but
1351 * it's the best we can do. Print the summary if we're
1352 * not reading from a savefile - i.e., if we're doing a
1353 * live capture - and exit.
1354 */
1355 if (pd != NULL && pcap_file(pd) == NULL) {
1356 /*
1357 * We got interrupted, so perhaps we didn't
1358 * manage to finish a line we were printing.
1359 * Print an extra newline, just in case.
1360 */
1361 putchar('\n');
1362 (void)fflush(stdout);
1363 info(1);
1364 }
1365 exit(0);
1366 #endif
1367 }
1368
1369 /*
1370 On windows, we do not use a fork, so we do not care less about
1371 waiting a child processes to die
1372 */
1373 #ifndef WIN32
1374 static RETSIGTYPE
1375 child_cleanup(int signo _U_)
1376 {
1377 wait(NULL);
1378 }
1379 #endif /* WIN32 */
1380
1381 static void
1382 info(register int verbose)
1383 {
1384 struct pcap_stat stat;
1385
1386 /*
1387 * Older versions of libpcap didn't set ps_ifdrop on some
1388 * platforms; initialize it to 0 to handle that.
1389 */
1390 stat.ps_ifdrop = 0;
1391 if (pcap_stats(pd, &stat) < 0) {
1392 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1393 infoprint = 0;
1394 return;
1395 }
1396
1397 if (!verbose)
1398 fprintf(stderr, "%s: ", program_name);
1399
1400 (void)fprintf(stderr, "%u packets captured", packets_captured);
1401 if (!verbose)
1402 fputs(", ", stderr);
1403 else
1404 putc('\n', stderr);
1405 (void)fprintf(stderr, "%u packets received by filter", stat.ps_recv);
1406 if (!verbose)
1407 fputs(", ", stderr);
1408 else
1409 putc('\n', stderr);
1410 (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop);
1411 if (stat.ps_ifdrop != 0) {
1412 if (!verbose)
1413 fputs(", ", stderr);
1414 else
1415 putc('\n', stderr);
1416 (void)fprintf(stderr, "%u packets dropped by interface\n",
1417 stat.ps_ifdrop);
1418 } else
1419 putc('\n', stderr);
1420 infoprint = 0;
1421 }
1422
1423 #ifndef WIN32
1424 static void
1425 compress_savefile(const char *filename)
1426 {
1427 if (fork())
1428 return;
1429 /*
1430 * Set to lowest priority so that this doesn't disturb the capture
1431 */
1432 #ifdef NZERO
1433 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1434 #else
1435 setpriority(PRIO_PROCESS, 0, 19);
1436 #endif
1437 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1438 fprintf(stderr,
1439 "compress_savefile:execlp(%s, %s): %s\n",
1440 zflag,
1441 filename,
1442 strerror(errno));
1443 }
1444 #else /* WIN32 */
1445 static void
1446 compress_savefile(const char *filename)
1447 {
1448 fprintf(stderr,
1449 "compress_savefile failed. Functionality not implemented under windows\n");
1450 }
1451 #endif /* WIN32 */
1452
1453 static void
1454 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1455 {
1456 struct dump_info *dump_info;
1457
1458 ++packets_captured;
1459
1460 ++infodelay;
1461
1462 dump_info = (struct dump_info *)user;
1463
1464 /*
1465 * XXX - this won't force the file to rotate on the specified time
1466 * boundary, but it will rotate on the first packet received after the
1467 * specified Gflag number of seconds. Note: if a Gflag time boundary
1468 * and a Cflag size boundary coincide, the time rotation will occur
1469 * first thereby cancelling the Cflag boundary (since the file should
1470 * be 0).
1471 */
1472 if (Gflag != 0) {
1473 /* Check if it is time to rotate */
1474 time_t t;
1475
1476 /* Get the current time */
1477 if ((t = time(NULL)) == (time_t)-1) {
1478 error("dump_and_trunc_packet: can't get current_time: %s",
1479 pcap_strerror(errno));
1480 }
1481
1482
1483 /* If the time is greater than the specified window, rotate */
1484 if (t - Gflag_time >= Gflag) {
1485 /* Update the Gflag_time */
1486 Gflag_time = t;
1487 /* Update Gflag_count */
1488 Gflag_count++;
1489 /*
1490 * Close the current file and open a new one.
1491 */
1492 pcap_dump_close(dump_info->p);
1493
1494 /*
1495 * Compress the file we just closed, if the user asked for it
1496 */
1497 if (zflag != NULL)
1498 compress_savefile(dump_info->CurrentFileName);
1499
1500 /*
1501 * Check to see if we've exceeded the Wflag (when
1502 * not using Cflag).
1503 */
1504 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1505 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1506 Wflag);
1507 exit(0);
1508 /* NOTREACHED */
1509 }
1510 if (dump_info->CurrentFileName != NULL)
1511 free(dump_info->CurrentFileName);
1512 /* Allocate space for max filename + \0. */
1513 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1514 if (dump_info->CurrentFileName == NULL)
1515 error("dump_packet_and_trunc: malloc");
1516 /*
1517 * This is always the first file in the Cflag
1518 * rotation: e.g. 0
1519 * We also don't need numbering if Cflag is not set.
1520 */
1521 if (Cflag != 0)
1522 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1523 WflagChars);
1524 else
1525 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1526
1527 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1528 if (dump_info->p == NULL)
1529 error("%s", pcap_geterr(pd));
1530 }
1531 }
1532
1533 /*
1534 * XXX - this won't prevent capture files from getting
1535 * larger than Cflag - the last packet written to the
1536 * file could put it over Cflag.
1537 */
1538 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1539 /*
1540 * Close the current file and open a new one.
1541 */
1542 pcap_dump_close(dump_info->p);
1543
1544 /*
1545 * Compress the file we just closed, if the user asked for it
1546 */
1547 if (zflag != NULL)
1548 compress_savefile(dump_info->CurrentFileName);
1549
1550 Cflag_count++;
1551 if (Wflag > 0) {
1552 if (Cflag_count >= Wflag)
1553 Cflag_count = 0;
1554 }
1555 if (dump_info->CurrentFileName != NULL)
1556 free(dump_info->CurrentFileName);
1557 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1558 if (dump_info->CurrentFileName == NULL)
1559 error("dump_packet_and_trunc: malloc");
1560 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1561 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1562 if (dump_info->p == NULL)
1563 error("%s", pcap_geterr(pd));
1564 }
1565
1566 pcap_dump((u_char *)dump_info->p, h, sp);
1567 #ifdef HAVE_PCAP_DUMP_FLUSH
1568 if (Uflag)
1569 pcap_dump_flush(dump_info->p);
1570 #endif
1571
1572 --infodelay;
1573 if (infoprint)
1574 info(0);
1575 }
1576
1577 static void
1578 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1579 {
1580 ++packets_captured;
1581
1582 ++infodelay;
1583
1584 pcap_dump(user, h, sp);
1585 #ifdef HAVE_PCAP_DUMP_FLUSH
1586 if (Uflag)
1587 pcap_dump_flush((pcap_dumper_t *)user);
1588 #endif
1589
1590 --infodelay;
1591 if (infoprint)
1592 info(0);
1593 }
1594
1595 static void
1596 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1597 {
1598 struct print_info *print_info;
1599 u_int hdrlen;
1600
1601 ++packets_captured;
1602
1603 ++infodelay;
1604 ts_print(&h->ts);
1605
1606 print_info = (struct print_info *)user;
1607
1608 /*
1609 * Some printers want to check that they're not walking off the
1610 * end of the packet.
1611 * Rather than pass it all the way down, we set this global.
1612 */
1613 snapend = sp + h->caplen;
1614
1615 if(print_info->ndo_type) {
1616 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1617 } else {
1618 hdrlen = (*print_info->p.printer)(h, sp);
1619 }
1620
1621 if (Xflag) {
1622 /*
1623 * Print the raw packet data in hex and ASCII.
1624 */
1625 if (Xflag > 1) {
1626 /*
1627 * Include the link-layer header.
1628 */
1629 hex_and_ascii_print("\n\t", sp, h->caplen);
1630 } else {
1631 /*
1632 * Don't include the link-layer header - and if
1633 * we have nothing past the link-layer header,
1634 * print nothing.
1635 */
1636 if (h->caplen > hdrlen)
1637 hex_and_ascii_print("\n\t", sp + hdrlen,
1638 h->caplen - hdrlen);
1639 }
1640 } else if (xflag) {
1641 /*
1642 * Print the raw packet data in hex.
1643 */
1644 if (xflag > 1) {
1645 /*
1646 * Include the link-layer header.
1647 */
1648 hex_print("\n\t", sp, h->caplen);
1649 } else {
1650 /*
1651 * Don't include the link-layer header - and if
1652 * we have nothing past the link-layer header,
1653 * print nothing.
1654 */
1655 if (h->caplen > hdrlen)
1656 hex_print("\n\t", sp + hdrlen,
1657 h->caplen - hdrlen);
1658 }
1659 } else if (Aflag) {
1660 /*
1661 * Print the raw packet data in ASCII.
1662 */
1663 if (Aflag > 1) {
1664 /*
1665 * Include the link-layer header.
1666 */
1667 ascii_print(sp, h->caplen);
1668 } else {
1669 /*
1670 * Don't include the link-layer header - and if
1671 * we have nothing past the link-layer header,
1672 * print nothing.
1673 */
1674 if (h->caplen > hdrlen)
1675 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1676 }
1677 }
1678
1679 putchar('\n');
1680
1681 --infodelay;
1682 if (infoprint)
1683 info(0);
1684 }
1685
1686 #ifdef WIN32
1687 /*
1688 * XXX - there should really be libpcap calls to get the version
1689 * number as a string (the string would be generated from #defines
1690 * at run time, so that it's not generated from string constants
1691 * in the library, as, on many UNIX systems, those constants would
1692 * be statically linked into the application executable image, and
1693 * would thus reflect the version of libpcap on the system on
1694 * which the application was *linked*, not the system on which it's
1695 * *running*.
1696 *
1697 * That routine should be documented, unlike the "version[]"
1698 * string, so that UNIX vendors providing their own libpcaps
1699 * don't omit it (as a couple of vendors have...).
1700 *
1701 * Packet.dll should perhaps also export a routine to return the
1702 * version number of the Packet.dll code, to supply the
1703 * "Wpcap_version" information on Windows.
1704 */
1705 char WDversion[]="current-cvs.tcpdump.org";
1706 #if !defined(HAVE_GENERATED_VERSION)
1707 char version[]="current-cvs.tcpdump.org";
1708 #endif
1709 char pcap_version[]="current-cvs.tcpdump.org";
1710 char Wpcap_version[]="3.1";
1711 #endif
1712
1713 /*
1714 * By default, print the specified data out in hex and ASCII.
1715 */
1716 static void
1717 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1718 {
1719 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1720 }
1721
1722 void
1723 default_print(const u_char *bp, u_int length)
1724 {
1725 ndo_default_print(gndo, bp, length);
1726 }
1727
1728 #ifdef SIGINFO
1729 RETSIGTYPE requestinfo(int signo _U_)
1730 {
1731 if (infodelay)
1732 ++infoprint;
1733 else
1734 info(0);
1735 }
1736 #endif
1737
1738 /*
1739 * Called once each second in verbose mode while dumping to file
1740 */
1741 #ifdef USE_WIN32_MM_TIMER
1742 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1743 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1744 {
1745 struct pcap_stat stat;
1746
1747 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1748 fprintf(stderr, "Got %u\r", packets_captured);
1749 }
1750 #elif defined(HAVE_ALARM)
1751 static void verbose_stats_dump(int sig _U_)
1752 {
1753 struct pcap_stat stat;
1754
1755 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1756 fprintf(stderr, "Got %u\r", packets_captured);
1757 alarm(1);
1758 }
1759 #endif
1760
1761 static void
1762 usage(void)
1763 {
1764 extern char version[];
1765 #ifndef HAVE_PCAP_LIB_VERSION
1766 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1767 extern char pcap_version[];
1768 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1769 static char pcap_version[] = "unknown";
1770 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1771 #endif /* HAVE_PCAP_LIB_VERSION */
1772
1773 #ifdef HAVE_PCAP_LIB_VERSION
1774 #ifdef WIN32
1775 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1776 #else /* WIN32 */
1777 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1778 #endif /* WIN32 */
1779 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1780 #else /* HAVE_PCAP_LIB_VERSION */
1781 #ifdef WIN32
1782 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1783 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1784 #else /* WIN32 */
1785 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1786 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1787 #endif /* WIN32 */
1788 #endif /* HAVE_PCAP_LIB_VERSION */
1789 (void)fprintf(stderr,
1790 "Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1791 (void)fprintf(stderr,
1792 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1793 (void)fprintf(stderr,
1794 "\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
1795 (void)fprintf(stderr,
1796 "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
1797 (void)fprintf(stderr,
1798 "\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
1799 (void)fprintf(stderr,
1800 "\t\t[ expression ]\n");
1801 exit(1);
1802 }
1803
1804
1805
1806 /* VARARGS */
1807 static void
1808 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1809 {
1810 va_list ap;
1811
1812 (void)fprintf(stderr, "%s: ", program_name);
1813 va_start(ap, fmt);
1814 (void)vfprintf(stderr, fmt, ap);
1815 va_end(ap);
1816 if (*fmt) {
1817 fmt += strlen(fmt);
1818 if (fmt[-1] != '\n')
1819 (void)fputc('\n', stderr);
1820 }
1821 exit(1);
1822 /* NOTREACHED */
1823 }
1824
1825 /* VARARGS */
1826 static void
1827 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1828 {
1829 va_list ap;
1830
1831 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1832 va_start(ap, fmt);
1833 (void)vfprintf(stderr, fmt, ap);
1834 va_end(ap);
1835 if (*fmt) {
1836 fmt += strlen(fmt);
1837 if (fmt[-1] != '\n')
1838 (void)fputc('\n', stderr);
1839 }
1840 }
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