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