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