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Make the date on the change notes for 4.1.0 match the release date.
[tcpdump] / tcpdump.c
1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Support for splitting captures into multiple files with a maximum
22 * file size:
23 *
24 * Copyright (c) 2001
25 * Seth Webster <swebster@sst.ll.mit.edu>
26 */
27
28 #ifndef lint
29 static const char copyright[] _U_ =
30 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
31 The Regents of the University of California. All rights reserved.\n";
32 static const char rcsid[] _U_ =
33 "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)";
34 #endif
35
36 /*
37 * tcpdump - monitor tcp/ip traffic on an ethernet.
38 *
39 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
40 * Mercilessly hacked and occasionally improved since then via the
41 * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
42 */
43
44 #ifdef HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47
48 #include <tcpdump-stdinc.h>
49
50 #ifdef WIN32
51 #include "getopt.h"
52 #include "w32_fzs.h"
53 extern int strcasecmp (const char *__s1, const char *__s2);
54 extern int SIZE_BUF;
55 #define off_t long
56 #define uint UINT
57 #endif /* WIN32 */
58
59 #ifdef HAVE_SMI_H
60 #include <smi.h>
61 #endif
62
63 #include <pcap.h>
64 #include <signal.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #include <limits.h>
69 #ifndef WIN32
70 #include <sys/wait.h>
71 #include <sys/resource.h>
72 #include <pwd.h>
73 #include <grp.h>
74 #include <errno.h>
75 #endif /* WIN32 */
76
77
78 #include "netdissect.h"
79 #include "interface.h"
80 #include "addrtoname.h"
81 #include "machdep.h"
82 #include "setsignal.h"
83 #include "gmt2local.h"
84 #include "pcap-missing.h"
85
86 #ifndef NAME_MAX
87 #define NAME_MAX 255
88 #endif
89
90 netdissect_options Gndo;
91 netdissect_options *gndo = &Gndo;
92
93 static int dflag; /* print filter code */
94 static int Lflag; /* list available data link types and exit */
95 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
96
97 static int infodelay;
98 static int infoprint;
99
100 char *program_name;
101
102 int32_t thiszone; /* seconds offset from gmt to local time */
103
104 /* Forwards */
105 static RETSIGTYPE cleanup(int);
106 static RETSIGTYPE child_cleanup(int);
107 static void usage(void) __attribute__((noreturn));
108 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
109
110 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
111 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
112 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
113 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
114 static void droproot(const char *, const char *);
115 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
116 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
117
118 #ifdef SIGINFO
119 RETSIGTYPE requestinfo(int);
120 #endif
121
122 #if defined(USE_WIN32_MM_TIMER)
123 #include <MMsystem.h>
124 static UINT timer_id;
125 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
126 #elif defined(HAVE_ALARM)
127 static void verbose_stats_dump(int sig);
128 #endif
129
130 static void info(int);
131 static u_int packets_captured;
132
133 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
134 typedef u_int (*if_ndo_printer)(struct netdissect_options *ndo,
135 const struct pcap_pkthdr *, const u_char *);
136
137 struct printer {
138 if_printer f;
139 int type;
140 };
141
142
143 struct ndo_printer {
144 if_ndo_printer f;
145 int type;
146 };
147
148
149 static struct printer printers[] = {
150 { arcnet_if_print, DLT_ARCNET },
151 #ifdef DLT_ARCNET_LINUX
152 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
153 #endif
154 { ether_if_print, DLT_EN10MB },
155 { token_if_print, DLT_IEEE802 },
156 #ifdef DLT_LANE8023
157 { lane_if_print, DLT_LANE8023 },
158 #endif
159 #ifdef DLT_CIP
160 { cip_if_print, DLT_CIP },
161 #endif
162 #ifdef DLT_ATM_CLIP
163 { cip_if_print, DLT_ATM_CLIP },
164 #endif
165 { sl_if_print, DLT_SLIP },
166 #ifdef DLT_SLIP_BSDOS
167 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
168 #endif
169 { ppp_if_print, DLT_PPP },
170 #ifdef DLT_PPP_WITHDIRECTION
171 { ppp_if_print, DLT_PPP_WITHDIRECTION },
172 #endif
173 #ifdef DLT_PPP_BSDOS
174 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
175 #endif
176 { fddi_if_print, DLT_FDDI },
177 { null_if_print, DLT_NULL },
178 #ifdef DLT_LOOP
179 { null_if_print, DLT_LOOP },
180 #endif
181 { raw_if_print, DLT_RAW },
182 { atm_if_print, DLT_ATM_RFC1483 },
183 #ifdef DLT_C_HDLC
184 { chdlc_if_print, DLT_C_HDLC },
185 #endif
186 #ifdef DLT_HDLC
187 { chdlc_if_print, DLT_HDLC },
188 #endif
189 #ifdef DLT_PPP_SERIAL
190 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
191 #endif
192 #ifdef DLT_PPP_ETHER
193 { pppoe_if_print, DLT_PPP_ETHER },
194 #endif
195 #ifdef DLT_LINUX_SLL
196 { sll_if_print, DLT_LINUX_SLL },
197 #endif
198 #ifdef DLT_IEEE802_11
199 { ieee802_11_if_print, DLT_IEEE802_11},
200 #endif
201 #ifdef DLT_LTALK
202 { ltalk_if_print, DLT_LTALK },
203 #endif
204 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
205 { pflog_if_print, DLT_PFLOG },
206 #endif
207 #ifdef DLT_FR
208 { fr_if_print, DLT_FR },
209 #endif
210 #ifdef DLT_FRELAY
211 { fr_if_print, DLT_FRELAY },
212 #endif
213 #ifdef DLT_SUNATM
214 { sunatm_if_print, DLT_SUNATM },
215 #endif
216 #ifdef DLT_IP_OVER_FC
217 { ipfc_if_print, DLT_IP_OVER_FC },
218 #endif
219 #ifdef DLT_PRISM_HEADER
220 { prism_if_print, DLT_PRISM_HEADER },
221 #endif
222 #ifdef DLT_IEEE802_11_RADIO
223 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
224 #endif
225 #ifdef DLT_ENC
226 { enc_if_print, DLT_ENC },
227 #endif
228 #ifdef DLT_SYMANTEC_FIREWALL
229 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
230 #endif
231 #ifdef DLT_APPLE_IP_OVER_IEEE1394
232 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
233 #endif
234 #ifdef DLT_IEEE802_11_RADIO_AVS
235 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
236 #endif
237 #ifdef DLT_JUNIPER_ATM1
238 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
239 #endif
240 #ifdef DLT_JUNIPER_ATM2
241 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
242 #endif
243 #ifdef DLT_JUNIPER_MFR
244 { juniper_mfr_print, DLT_JUNIPER_MFR },
245 #endif
246 #ifdef DLT_JUNIPER_MLFR
247 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
248 #endif
249 #ifdef DLT_JUNIPER_MLPPP
250 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
251 #endif
252 #ifdef DLT_JUNIPER_PPPOE
253 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
254 #endif
255 #ifdef DLT_JUNIPER_PPPOE_ATM
256 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
257 #endif
258 #ifdef DLT_JUNIPER_GGSN
259 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
260 #endif
261 #ifdef DLT_JUNIPER_ES
262 { juniper_es_print, DLT_JUNIPER_ES },
263 #endif
264 #ifdef DLT_JUNIPER_MONITOR
265 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
266 #endif
267 #ifdef DLT_JUNIPER_SERVICES
268 { juniper_services_print, DLT_JUNIPER_SERVICES },
269 #endif
270 #ifdef DLT_JUNIPER_ETHER
271 { juniper_ether_print, DLT_JUNIPER_ETHER },
272 #endif
273 #ifdef DLT_JUNIPER_PPP
274 { juniper_ppp_print, DLT_JUNIPER_PPP },
275 #endif
276 #ifdef DLT_JUNIPER_FRELAY
277 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
278 #endif
279 #ifdef DLT_JUNIPER_CHDLC
280 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
281 #endif
282 #ifdef DLT_MFR
283 { mfr_if_print, DLT_MFR },
284 #endif
285 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
286 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
287 #endif
288 #ifdef HAVE_PCAP_USB_H
289 #ifdef DLT_USB_LINUX
290 { usb_linux_48_byte_print, DLT_USB_LINUX},
291 #endif /* DLT_USB_LINUX */
292 #ifdef DLT_USB_LINUX_MMAPPED
293 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
294 #endif /* DLT_USB_LINUX_MMAPPED */
295 #endif /* HAVE_PCAP_USB_H */
296 #ifdef DLT_IPV4
297 { raw_if_print, DLT_IPV4 },
298 #endif
299 #ifdef DLT_IPV6
300 { raw_if_print, DLT_IPV6 },
301 #endif
302 { NULL, 0 },
303 };
304
305 static struct ndo_printer ndo_printers[] = {
306 #ifdef DLT_IPNET
307 { ipnet_if_print, DLT_IPNET },
308 #endif
309 { 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, "aAb" 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
614 case 'b':
615 ++bflag;
616 break;
617
618 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
619 case 'B':
620 Bflag = atoi(optarg)*1024;
621 if (Bflag <= 0)
622 error("invalid packet buffer size %s", optarg);
623 break;
624 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
625
626 case 'c':
627 cnt = atoi(optarg);
628 if (cnt <= 0)
629 error("invalid packet count %s", optarg);
630 break;
631
632 case 'C':
633 Cflag = atoi(optarg) * 1000000;
634 if (Cflag < 0)
635 error("invalid file size %s", optarg);
636 break;
637
638 case 'd':
639 ++dflag;
640 break;
641
642 #ifdef HAVE_PCAP_FINDALLDEVS
643 case 'D':
644 if (pcap_findalldevs(&devpointer, ebuf) < 0)
645 error("%s", ebuf);
646 else {
647 for (i = 0; devpointer != 0; i++) {
648 printf("%d.%s", i+1, devpointer->name);
649 if (devpointer->description != NULL)
650 printf(" (%s)", devpointer->description);
651 printf("\n");
652 devpointer = devpointer->next;
653 }
654 }
655 return 0;
656 #endif /* HAVE_PCAP_FINDALLDEVS */
657
658 case 'L':
659 Lflag++;
660 break;
661
662 case 'e':
663 ++eflag;
664 break;
665
666 case 'E':
667 #ifndef HAVE_LIBCRYPTO
668 warning("crypto code not compiled in");
669 #endif
670 gndo->ndo_espsecret = optarg;
671 break;
672
673 case 'f':
674 ++fflag;
675 break;
676
677 case 'F':
678 infile = optarg;
679 break;
680
681 case 'G':
682 Gflag = atoi(optarg);
683 if (Gflag < 0)
684 error("invalid number of seconds %s", optarg);
685
686 /* We will create one file initially. */
687 Gflag_count = 0;
688
689 /* Grab the current time for rotation use. */
690 if ((Gflag_time = time(NULL)) == (time_t)-1) {
691 error("main: can't get current time: %s",
692 pcap_strerror(errno));
693 }
694 break;
695
696 case 'i':
697 if (optarg[0] == '0' && optarg[1] == 0)
698 error("Invalid adapter index");
699
700 #ifdef HAVE_PCAP_FINDALLDEVS
701 /*
702 * If the argument is a number, treat it as
703 * an index into the list of adapters, as
704 * printed by "tcpdump -D".
705 *
706 * This should be OK on UNIX systems, as interfaces
707 * shouldn't have names that begin with digits.
708 * It can be useful on Windows, where more than
709 * one interface can have the same name.
710 */
711 if ((devnum = atoi(optarg)) != 0) {
712 if (devnum < 0)
713 error("Invalid adapter index");
714
715 if (pcap_findalldevs(&devpointer, ebuf) < 0)
716 error("%s", ebuf);
717 else {
718 /*
719 * Look for the devnum-th entry
720 * in the list of devices
721 * (1-based).
722 */
723 for (i = 0;
724 i < devnum-1 && devpointer != NULL;
725 i++, devpointer = devpointer->next)
726 ;
727 if (devpointer == NULL)
728 error("Invalid adapter index");
729 }
730 device = devpointer->name;
731 break;
732 }
733 #endif /* HAVE_PCAP_FINDALLDEVS */
734 device = optarg;
735 break;
736
737 #ifdef HAVE_PCAP_CREATE
738 case 'I':
739 ++Iflag;
740 break;
741 #endif /* HAVE_PCAP_CREATE */
742
743 case 'l':
744 #ifdef WIN32
745 /*
746 * _IOLBF is the same as _IOFBF in Microsoft's C
747 * libraries; the only alternative they offer
748 * is _IONBF.
749 *
750 * XXX - this should really be checking for MSVC++,
751 * not WIN32, if, for example, MinGW has its own
752 * C library that is more UNIX-compatible.
753 */
754 setvbuf(stdout, NULL, _IONBF, 0);
755 #else /* WIN32 */
756 #ifdef HAVE_SETLINEBUF
757 setlinebuf(stdout);
758 #else
759 setvbuf(stdout, NULL, _IOLBF, 0);
760 #endif
761 #endif /* WIN32 */
762 break;
763
764 case 'K':
765 ++Kflag;
766 break;
767
768 case 'm':
769 #ifdef LIBSMI
770 if (smiLoadModule(optarg) == 0) {
771 error("could not load MIB module %s", optarg);
772 }
773 sflag = 1;
774 #else
775 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
776 program_name, optarg);
777 (void)fprintf(stderr, "(no libsmi support)\n");
778 #endif
779 break;
780
781 case 'M':
782 /* TCP-MD5 shared secret */
783 #ifndef HAVE_LIBCRYPTO
784 warning("crypto code not compiled in");
785 #endif
786 sigsecret = optarg;
787 break;
788
789 case 'n':
790 ++nflag;
791 break;
792
793 case 'N':
794 ++Nflag;
795 break;
796
797 case 'O':
798 Oflag = 0;
799 break;
800
801 case 'p':
802 ++pflag;
803 break;
804
805 case 'q':
806 ++qflag;
807 ++suppress_default_print;
808 break;
809
810 case 'r':
811 RFileName = optarg;
812 break;
813
814 case 'R':
815 Rflag = 0;
816 break;
817
818 case 's': {
819 char *end;
820
821 snaplen = strtol(optarg, &end, 0);
822 if (optarg == end || *end != '\0'
823 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
824 error("invalid snaplen %s", optarg);
825 else if (snaplen == 0)
826 snaplen = MAXIMUM_SNAPLEN;
827 break;
828 }
829
830 case 'S':
831 ++Sflag;
832 break;
833
834 case 't':
835 ++tflag;
836 break;
837
838 case 'T':
839 if (strcasecmp(optarg, "vat") == 0)
840 packettype = PT_VAT;
841 else if (strcasecmp(optarg, "wb") == 0)
842 packettype = PT_WB;
843 else if (strcasecmp(optarg, "rpc") == 0)
844 packettype = PT_RPC;
845 else if (strcasecmp(optarg, "rtp") == 0)
846 packettype = PT_RTP;
847 else if (strcasecmp(optarg, "rtcp") == 0)
848 packettype = PT_RTCP;
849 else if (strcasecmp(optarg, "snmp") == 0)
850 packettype = PT_SNMP;
851 else if (strcasecmp(optarg, "cnfp") == 0)
852 packettype = PT_CNFP;
853 else if (strcasecmp(optarg, "tftp") == 0)
854 packettype = PT_TFTP;
855 else if (strcasecmp(optarg, "aodv") == 0)
856 packettype = PT_AODV;
857 else
858 error("unknown packet type `%s'", optarg);
859 break;
860
861 case 'u':
862 ++uflag;
863 break;
864
865 #ifdef HAVE_PCAP_DUMP_FLUSH
866 case 'U':
867 ++Uflag;
868 break;
869 #endif
870
871 case 'v':
872 ++vflag;
873 break;
874
875 case 'w':
876 WFileName = optarg;
877 break;
878
879 case 'W':
880 Wflag = atoi(optarg);
881 if (Wflag < 0)
882 error("invalid number of output files %s", optarg);
883 WflagChars = getWflagChars(Wflag);
884 break;
885
886 case 'x':
887 ++xflag;
888 ++suppress_default_print;
889 break;
890
891 case 'X':
892 ++Xflag;
893 ++suppress_default_print;
894 break;
895
896 case 'y':
897 gndo->ndo_dltname = optarg;
898 gndo->ndo_dlt =
899 pcap_datalink_name_to_val(gndo->ndo_dltname);
900 if (gndo->ndo_dlt < 0)
901 error("invalid data link type %s", gndo->ndo_dltname);
902 break;
903
904 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
905 case 'Y':
906 {
907 /* Undocumented flag */
908 #ifdef HAVE_PCAP_DEBUG
909 extern int pcap_debug;
910 pcap_debug = 1;
911 #else
912 extern int yydebug;
913 yydebug = 1;
914 #endif
915 }
916 break;
917 #endif
918 case 'z':
919 if (optarg) {
920 zflag = strdup(optarg);
921 } else {
922 usage();
923 /* NOTREACHED */
924 }
925 break;
926
927 case 'Z':
928 if (optarg) {
929 username = strdup(optarg);
930 }
931 else {
932 usage();
933 /* NOTREACHED */
934 }
935 break;
936
937 default:
938 usage();
939 /* NOTREACHED */
940 }
941
942 switch (tflag) {
943
944 case 0: /* Default */
945 case 4: /* Default + Date*/
946 thiszone = gmt2local(0);
947 break;
948
949 case 1: /* No time stamp */
950 case 2: /* Unix timeval style */
951 case 3: /* Microseconds since previous packet */
952 case 5: /* Microseconds since first packet */
953 break;
954
955 default: /* Not supported */
956 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
957 break;
958 }
959
960 #ifdef WITH_CHROOT
961 /* if run as root, prepare for chrooting */
962 if (getuid() == 0 || geteuid() == 0) {
963 /* future extensibility for cmd-line arguments */
964 if (!chroot_dir)
965 chroot_dir = WITH_CHROOT;
966 }
967 #endif
968
969 #ifdef WITH_USER
970 /* if run as root, prepare for dropping root privileges */
971 if (getuid() == 0 || geteuid() == 0) {
972 /* Run with '-Z root' to restore old behaviour */
973 if (!username)
974 username = WITH_USER;
975 }
976 #endif
977
978 if (RFileName != NULL) {
979 int dlt;
980 const char *dlt_name;
981
982 #ifndef WIN32
983 /*
984 * We don't need network access, so relinquish any set-UID
985 * or set-GID privileges we have (if any).
986 *
987 * We do *not* want set-UID privileges when opening a
988 * trace file, as that might let the user read other
989 * people's trace files (especially if we're set-UID
990 * root).
991 */
992 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
993 fprintf(stderr, "Warning: setgid/setuid failed !\n");
994 #endif /* WIN32 */
995 pd = pcap_open_offline(RFileName, ebuf);
996 if (pd == NULL)
997 error("%s", ebuf);
998 dlt = pcap_datalink(pd);
999 dlt_name = pcap_datalink_val_to_name(dlt);
1000 if (dlt_name == NULL) {
1001 fprintf(stderr, "reading from file %s, link-type %u\n",
1002 RFileName, dlt);
1003 } else {
1004 fprintf(stderr,
1005 "reading from file %s, link-type %s (%s)\n",
1006 RFileName, dlt_name,
1007 pcap_datalink_val_to_description(dlt));
1008 }
1009 localnet = 0;
1010 netmask = 0;
1011 if (fflag != 0)
1012 error("-f and -r options are incompatible");
1013 } else {
1014 if (device == NULL) {
1015 device = pcap_lookupdev(ebuf);
1016 if (device == NULL)
1017 error("%s", ebuf);
1018 }
1019 #ifdef WIN32
1020 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1021 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1022 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1023 }
1024 else
1025 {
1026 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1027 }
1028
1029 fflush(stderr);
1030 #endif /* WIN32 */
1031 #ifdef HAVE_PCAP_CREATE
1032 pd = pcap_create(device, ebuf);
1033 if (pd == NULL)
1034 error("%s", ebuf);
1035 /*
1036 * Is this an interface that supports monitor mode?
1037 */
1038 if (pcap_can_set_rfmon(pd) == 1)
1039 supports_monitor_mode = 1;
1040 else
1041 supports_monitor_mode = 0;
1042 status = pcap_set_snaplen(pd, snaplen);
1043 if (status != 0)
1044 error("%s: pcap_set_snaplen failed: %s",
1045 device, pcap_statustostr(status));
1046 status = pcap_set_promisc(pd, !pflag);
1047 if (status != 0)
1048 error("%s: pcap_set_promisc failed: %s",
1049 device, pcap_statustostr(status));
1050 if (Iflag) {
1051 status = pcap_set_rfmon(pd, 1);
1052 if (status != 0)
1053 error("%s: pcap_set_rfmon failed: %s",
1054 device, pcap_statustostr(status));
1055 }
1056 status = pcap_set_timeout(pd, 1000);
1057 if (status != 0)
1058 error("%s: pcap_set_timeout failed: %s",
1059 device, pcap_statustostr(status));
1060 if (Bflag != 0) {
1061 status = pcap_set_buffer_size(pd, Bflag);
1062 if (status != 0)
1063 error("%s: pcap_set_buffer_size failed: %s",
1064 device, pcap_statustostr(status));
1065 }
1066 status = pcap_activate(pd);
1067 if (status < 0) {
1068 /*
1069 * pcap_activate() failed.
1070 */
1071 cp = pcap_geterr(pd);
1072 if (status == PCAP_ERROR)
1073 error("%s", cp);
1074 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1075 status == PCAP_ERROR_PERM_DENIED) &&
1076 *cp != '\0')
1077 error("%s: %s\n(%s)", device,
1078 pcap_statustostr(status), cp);
1079 else
1080 error("%s: %s", device,
1081 pcap_statustostr(status));
1082 } else if (status > 0) {
1083 /*
1084 * pcap_activate() succeeded, but it's warning us
1085 * of a problem it had.
1086 */
1087 cp = pcap_geterr(pd);
1088 if (status == PCAP_WARNING)
1089 warning("%s", cp);
1090 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1091 *cp != '\0')
1092 warning("%s: %s\n(%s)", device,
1093 pcap_statustostr(status), cp);
1094 else
1095 warning("%s: %s", device,
1096 pcap_statustostr(status));
1097 }
1098 #else
1099 *ebuf = '\0';
1100 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1101 if (pd == NULL)
1102 error("%s", ebuf);
1103 else if (*ebuf)
1104 warning("%s", ebuf);
1105 #endif /* HAVE_PCAP_CREATE */
1106 /*
1107 * Let user own process after socket has been opened.
1108 */
1109 #ifndef WIN32
1110 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1111 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1112 #endif /* WIN32 */
1113 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1114 if(Bflag != 0)
1115 if(pcap_setbuff(pd, Bflag)==-1){
1116 error("%s", pcap_geterr(pd));
1117 }
1118 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1119 if (Lflag)
1120 show_dlts_and_exit(device, pd);
1121 if (gndo->ndo_dlt >= 0) {
1122 #ifdef HAVE_PCAP_SET_DATALINK
1123 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1124 error("%s", pcap_geterr(pd));
1125 #else
1126 /*
1127 * We don't actually support changing the
1128 * data link type, so we only let them
1129 * set it to what it already is.
1130 */
1131 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1132 error("%s is not one of the DLTs supported by this device\n",
1133 gndo->ndo_dltname);
1134 }
1135 #endif
1136 (void)fprintf(stderr, "%s: data link type %s\n",
1137 program_name, gndo->ndo_dltname);
1138 (void)fflush(stderr);
1139 }
1140 i = pcap_snapshot(pd);
1141 if (snaplen < i) {
1142 warning("snaplen raised from %d to %d", snaplen, i);
1143 snaplen = i;
1144 }
1145 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1146 localnet = 0;
1147 netmask = 0;
1148 warning("%s", ebuf);
1149 }
1150 }
1151 if (infile)
1152 cmdbuf = read_infile(infile);
1153 else
1154 cmdbuf = copy_argv(&argv[optind]);
1155
1156 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1157 error("%s", pcap_geterr(pd));
1158 free(cmdbuf);
1159 if (dflag) {
1160 bpf_dump(&fcode, dflag);
1161 pcap_close(pd);
1162 exit(0);
1163 }
1164 init_addrtoname(localnet, netmask);
1165 init_checksum();
1166
1167 #ifndef WIN32
1168 (void)setsignal(SIGPIPE, cleanup);
1169 (void)setsignal(SIGTERM, cleanup);
1170 (void)setsignal(SIGINT, cleanup);
1171 (void)setsignal(SIGCHLD, child_cleanup);
1172 #endif /* WIN32 */
1173 /* Cooperate with nohup(1) */
1174 #ifndef WIN32
1175 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1176 (void)setsignal(SIGHUP, oldhandler);
1177 #endif /* WIN32 */
1178
1179 if (pcap_setfilter(pd, &fcode) < 0)
1180 error("%s", pcap_geterr(pd));
1181 if (WFileName) {
1182 pcap_dumper_t *p;
1183 /* Do not exceed the default NAME_MAX for files. */
1184 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1185
1186 if (dumpinfo.CurrentFileName == NULL)
1187 error("malloc of dumpinfo.CurrentFileName");
1188
1189 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1190 if (Cflag != 0)
1191 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1192 else
1193 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1194
1195 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1196 if (p == NULL)
1197 error("%s", pcap_geterr(pd));
1198 if (Cflag != 0 || Gflag != 0) {
1199 callback = dump_packet_and_trunc;
1200 dumpinfo.WFileName = WFileName;
1201 dumpinfo.pd = pd;
1202 dumpinfo.p = p;
1203 pcap_userdata = (u_char *)&dumpinfo;
1204 } else {
1205 callback = dump_packet;
1206 pcap_userdata = (u_char *)p;
1207 }
1208 } else {
1209 type = pcap_datalink(pd);
1210 printinfo.ndo_type = 1;
1211 printinfo.ndo = gndo;
1212 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1213 if (printinfo.p.ndo_printer == NULL) {
1214 printinfo.p.printer = lookup_printer(type);
1215 printinfo.ndo_type = 0;
1216 if (printinfo.p.printer == NULL) {
1217 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1218 if (gndo->ndo_dltname != NULL)
1219 error("packet printing is not supported for link type %s: use -w",
1220 gndo->ndo_dltname);
1221 else
1222 error("packet printing is not supported for link type %d: use -w", type);
1223 }
1224 }
1225 callback = print_packet;
1226 pcap_userdata = (u_char *)&printinfo;
1227 }
1228 #ifndef WIN32
1229 /*
1230 * We cannot do this earlier, because we want to be able to open
1231 * the file (if done) for writing before giving up permissions.
1232 */
1233 if (getuid() == 0 || geteuid() == 0) {
1234 if (username || chroot_dir)
1235 droproot(username, chroot_dir);
1236 }
1237 #endif /* WIN32 */
1238 #ifdef SIGINFO
1239 /*
1240 * We can't get statistics when reading from a file rather
1241 * than capturing from a device.
1242 */
1243 if (RFileName == NULL)
1244 (void)setsignal(SIGINFO, requestinfo);
1245 #endif
1246
1247 if (vflag > 0 && WFileName) {
1248 /*
1249 * When capturing to a file, "-v" means tcpdump should,
1250 * every 10 secodns, "v"erbosely report the number of
1251 * packets captured.
1252 */
1253 #ifdef USE_WIN32_MM_TIMER
1254 /* call verbose_stats_dump() each 1000 +/-100msec */
1255 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1256 setvbuf(stderr, NULL, _IONBF, 0);
1257 #elif defined(HAVE_ALARM)
1258 (void)setsignal(SIGALRM, verbose_stats_dump);
1259 alarm(1);
1260 #endif
1261 }
1262
1263 #ifndef WIN32
1264 if (RFileName == NULL) {
1265 int dlt;
1266 const char *dlt_name;
1267
1268 if (!vflag && !WFileName) {
1269 (void)fprintf(stderr,
1270 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1271 program_name);
1272 } else
1273 (void)fprintf(stderr, "%s: ", program_name);
1274 dlt = pcap_datalink(pd);
1275 dlt_name = pcap_datalink_val_to_name(dlt);
1276 if (dlt_name == NULL) {
1277 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1278 device, dlt, snaplen);
1279 } else {
1280 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1281 device, dlt_name,
1282 pcap_datalink_val_to_description(dlt), snaplen);
1283 }
1284 (void)fflush(stderr);
1285 }
1286 #endif /* WIN32 */
1287 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1288 if (WFileName == NULL) {
1289 /*
1290 * We're printing packets. Flush the printed output,
1291 * so it doesn't get intermingled with error output.
1292 */
1293 if (status == -2) {
1294 /*
1295 * We got interrupted, so perhaps we didn't
1296 * manage to finish a line we were printing.
1297 * Print an extra newline, just in case.
1298 */
1299 putchar('\n');
1300 }
1301 (void)fflush(stdout);
1302 }
1303 if (status == -1) {
1304 /*
1305 * Error. Report it.
1306 */
1307 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1308 program_name, pcap_geterr(pd));
1309 }
1310 if (RFileName == NULL) {
1311 /*
1312 * We're doing a live capture. Report the capture
1313 * statistics.
1314 */
1315 info(1);
1316 }
1317 pcap_close(pd);
1318 exit(status == -1 ? 1 : 0);
1319 }
1320
1321 /* make a clean exit on interrupts */
1322 static RETSIGTYPE
1323 cleanup(int signo _U_)
1324 {
1325 #ifdef USE_WIN32_MM_TIMER
1326 if (timer_id)
1327 timeKillEvent(timer_id);
1328 timer_id = 0;
1329 #elif defined(HAVE_ALARM)
1330 alarm(0);
1331 #endif
1332
1333 #ifdef HAVE_PCAP_BREAKLOOP
1334 /*
1335 * We have "pcap_breakloop()"; use it, so that we do as little
1336 * as possible in the signal handler (it's probably not safe
1337 * to do anything with standard I/O streams in a signal handler -
1338 * the ANSI C standard doesn't say it is).
1339 */
1340 pcap_breakloop(pd);
1341 #else
1342 /*
1343 * We don't have "pcap_breakloop()"; this isn't safe, but
1344 * it's the best we can do. Print the summary if we're
1345 * not reading from a savefile - i.e., if we're doing a
1346 * live capture - and exit.
1347 */
1348 if (pd != NULL && pcap_file(pd) == NULL) {
1349 /*
1350 * We got interrupted, so perhaps we didn't
1351 * manage to finish a line we were printing.
1352 * Print an extra newline, just in case.
1353 */
1354 putchar('\n');
1355 (void)fflush(stdout);
1356 info(1);
1357 }
1358 exit(0);
1359 #endif
1360 }
1361
1362 /*
1363 On windows, we do not use a fork, so we do not care less about
1364 waiting a child processes to die
1365 */
1366 #ifndef WIN32
1367 static RETSIGTYPE
1368 child_cleanup(int signo _U_)
1369 {
1370 wait(NULL);
1371 }
1372 #endif /* WIN32 */
1373
1374 static void
1375 info(register int verbose)
1376 {
1377 struct pcap_stat stat;
1378
1379 /*
1380 * Older versions of libpcap didn't set ps_ifdrop on some
1381 * platforms; initialize it to 0 to handle that.
1382 */
1383 stat.ps_ifdrop = 0;
1384 if (pcap_stats(pd, &stat) < 0) {
1385 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1386 infoprint = 0;
1387 return;
1388 }
1389
1390 if (!verbose)
1391 fprintf(stderr, "%s: ", program_name);
1392
1393 (void)fprintf(stderr, "%u packets captured", packets_captured);
1394 if (!verbose)
1395 fputs(", ", stderr);
1396 else
1397 putc('\n', stderr);
1398 (void)fprintf(stderr, "%u packets received by filter", stat.ps_recv);
1399 if (!verbose)
1400 fputs(", ", stderr);
1401 else
1402 putc('\n', stderr);
1403 (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop);
1404 if (stat.ps_ifdrop != 0) {
1405 if (!verbose)
1406 fputs(", ", stderr);
1407 else
1408 putc('\n', stderr);
1409 (void)fprintf(stderr, "%u packets dropped by interface\n",
1410 stat.ps_ifdrop);
1411 } else
1412 putc('\n', stderr);
1413 infoprint = 0;
1414 }
1415
1416 #ifndef WIN32
1417 static void
1418 compress_savefile(const char *filename)
1419 {
1420 if (fork())
1421 return;
1422 /*
1423 * Set to lowest priority so that this doesn't disturb the capture
1424 */
1425 #ifdef NZERO
1426 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1427 #else
1428 setpriority(PRIO_PROCESS, 0, 19);
1429 #endif
1430 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1431 fprintf(stderr,
1432 "compress_savefile:execlp(%s, %s): %s\n",
1433 zflag,
1434 filename,
1435 strerror(errno));
1436 }
1437 #else /* WIN32 */
1438 static void
1439 compress_savefile(const char *filename)
1440 {
1441 fprintf(stderr,
1442 "compress_savefile failed. Functionality not implemented under windows\n");
1443 }
1444 #endif /* WIN32 */
1445
1446 static void
1447 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1448 {
1449 struct dump_info *dump_info;
1450
1451 ++packets_captured;
1452
1453 ++infodelay;
1454
1455 dump_info = (struct dump_info *)user;
1456
1457 /*
1458 * XXX - this won't force the file to rotate on the specified time
1459 * boundary, but it will rotate on the first packet received after the
1460 * specified Gflag number of seconds. Note: if a Gflag time boundary
1461 * and a Cflag size boundary coincide, the time rotation will occur
1462 * first thereby cancelling the Cflag boundary (since the file should
1463 * be 0).
1464 */
1465 if (Gflag != 0) {
1466 /* Check if it is time to rotate */
1467 time_t t;
1468
1469 /* Get the current time */
1470 if ((t = time(NULL)) == (time_t)-1) {
1471 error("dump_and_trunc_packet: can't get current_time: %s",
1472 pcap_strerror(errno));
1473 }
1474
1475
1476 /* If the time is greater than the specified window, rotate */
1477 if (t - Gflag_time >= Gflag) {
1478 /* Update the Gflag_time */
1479 Gflag_time = t;
1480 /* Update Gflag_count */
1481 Gflag_count++;
1482 /*
1483 * Close the current file and open a new one.
1484 */
1485 pcap_dump_close(dump_info->p);
1486
1487 /*
1488 * Compress the file we just closed, if the user asked for it
1489 */
1490 if (zflag != NULL)
1491 compress_savefile(dump_info->CurrentFileName);
1492
1493 /*
1494 * Check to see if we've exceeded the Wflag (when
1495 * not using Cflag).
1496 */
1497 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1498 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1499 Wflag);
1500 exit(0);
1501 /* NOTREACHED */
1502 }
1503 if (dump_info->CurrentFileName != NULL)
1504 free(dump_info->CurrentFileName);
1505 /* Allocate space for max filename + \0. */
1506 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1507 if (dump_info->CurrentFileName == NULL)
1508 error("dump_packet_and_trunc: malloc");
1509 /*
1510 * This is always the first file in the Cflag
1511 * rotation: e.g. 0
1512 * We also don't need numbering if Cflag is not set.
1513 */
1514 if (Cflag != 0)
1515 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1516 WflagChars);
1517 else
1518 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1519
1520 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1521 if (dump_info->p == NULL)
1522 error("%s", pcap_geterr(pd));
1523 }
1524 }
1525
1526 /*
1527 * XXX - this won't prevent capture files from getting
1528 * larger than Cflag - the last packet written to the
1529 * file could put it over Cflag.
1530 */
1531 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1532 /*
1533 * Close the current file and open a new one.
1534 */
1535 pcap_dump_close(dump_info->p);
1536
1537 /*
1538 * Compress the file we just closed, if the user asked for it
1539 */
1540 if (zflag != NULL)
1541 compress_savefile(dump_info->CurrentFileName);
1542
1543 Cflag_count++;
1544 if (Wflag > 0) {
1545 if (Cflag_count >= Wflag)
1546 Cflag_count = 0;
1547 }
1548 if (dump_info->CurrentFileName != NULL)
1549 free(dump_info->CurrentFileName);
1550 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1551 if (dump_info->CurrentFileName == NULL)
1552 error("dump_packet_and_trunc: malloc");
1553 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1554 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1555 if (dump_info->p == NULL)
1556 error("%s", pcap_geterr(pd));
1557 }
1558
1559 pcap_dump((u_char *)dump_info->p, h, sp);
1560 #ifdef HAVE_PCAP_DUMP_FLUSH
1561 if (Uflag)
1562 pcap_dump_flush(dump_info->p);
1563 #endif
1564
1565 --infodelay;
1566 if (infoprint)
1567 info(0);
1568 }
1569
1570 static void
1571 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1572 {
1573 ++packets_captured;
1574
1575 ++infodelay;
1576
1577 pcap_dump(user, h, sp);
1578 #ifdef HAVE_PCAP_DUMP_FLUSH
1579 if (Uflag)
1580 pcap_dump_flush((pcap_dumper_t *)user);
1581 #endif
1582
1583 --infodelay;
1584 if (infoprint)
1585 info(0);
1586 }
1587
1588 static void
1589 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1590 {
1591 struct print_info *print_info;
1592 u_int hdrlen;
1593
1594 ++packets_captured;
1595
1596 ++infodelay;
1597 ts_print(&h->ts);
1598
1599 print_info = (struct print_info *)user;
1600
1601 /*
1602 * Some printers want to check that they're not walking off the
1603 * end of the packet.
1604 * Rather than pass it all the way down, we set this global.
1605 */
1606 snapend = sp + h->caplen;
1607
1608 if(print_info->ndo_type) {
1609 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1610 } else {
1611 hdrlen = (*print_info->p.printer)(h, sp);
1612 }
1613
1614 if (Xflag) {
1615 /*
1616 * Print the raw packet data in hex and ASCII.
1617 */
1618 if (Xflag > 1) {
1619 /*
1620 * Include the link-layer header.
1621 */
1622 hex_and_ascii_print("\n\t", sp, h->caplen);
1623 } else {
1624 /*
1625 * Don't include the link-layer header - and if
1626 * we have nothing past the link-layer header,
1627 * print nothing.
1628 */
1629 if (h->caplen > hdrlen)
1630 hex_and_ascii_print("\n\t", sp + hdrlen,
1631 h->caplen - hdrlen);
1632 }
1633 } else if (xflag) {
1634 /*
1635 * Print the raw packet data in hex.
1636 */
1637 if (xflag > 1) {
1638 /*
1639 * Include the link-layer header.
1640 */
1641 hex_print("\n\t", sp, h->caplen);
1642 } else {
1643 /*
1644 * Don't include the link-layer header - and if
1645 * we have nothing past the link-layer header,
1646 * print nothing.
1647 */
1648 if (h->caplen > hdrlen)
1649 hex_print("\n\t", sp + hdrlen,
1650 h->caplen - hdrlen);
1651 }
1652 } else if (Aflag) {
1653 /*
1654 * Print the raw packet data in ASCII.
1655 */
1656 if (Aflag > 1) {
1657 /*
1658 * Include the link-layer header.
1659 */
1660 ascii_print(sp, h->caplen);
1661 } else {
1662 /*
1663 * Don't include the link-layer header - and if
1664 * we have nothing past the link-layer header,
1665 * print nothing.
1666 */
1667 if (h->caplen > hdrlen)
1668 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1669 }
1670 }
1671
1672 putchar('\n');
1673
1674 --infodelay;
1675 if (infoprint)
1676 info(0);
1677 }
1678
1679 #ifdef WIN32
1680 /*
1681 * XXX - there should really be libpcap calls to get the version
1682 * number as a string (the string would be generated from #defines
1683 * at run time, so that it's not generated from string constants
1684 * in the library, as, on many UNIX systems, those constants would
1685 * be statically linked into the application executable image, and
1686 * would thus reflect the version of libpcap on the system on
1687 * which the application was *linked*, not the system on which it's
1688 * *running*.
1689 *
1690 * That routine should be documented, unlike the "version[]"
1691 * string, so that UNIX vendors providing their own libpcaps
1692 * don't omit it (as a couple of vendors have...).
1693 *
1694 * Packet.dll should perhaps also export a routine to return the
1695 * version number of the Packet.dll code, to supply the
1696 * "Wpcap_version" information on Windows.
1697 */
1698 char WDversion[]="current-cvs.tcpdump.org";
1699 #if !defined(HAVE_GENERATED_VERSION)
1700 char version[]="current-cvs.tcpdump.org";
1701 #endif
1702 char pcap_version[]="current-cvs.tcpdump.org";
1703 char Wpcap_version[]="3.1";
1704 #endif
1705
1706 /*
1707 * By default, print the specified data out in hex and ASCII.
1708 */
1709 static void
1710 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1711 {
1712 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1713 }
1714
1715 void
1716 default_print(const u_char *bp, u_int length)
1717 {
1718 ndo_default_print(gndo, bp, length);
1719 }
1720
1721 #ifdef SIGINFO
1722 RETSIGTYPE requestinfo(int signo _U_)
1723 {
1724 if (infodelay)
1725 ++infoprint;
1726 else
1727 info(0);
1728 }
1729 #endif
1730
1731 /*
1732 * Called once each second in verbose mode while dumping to file
1733 */
1734 #ifdef USE_WIN32_MM_TIMER
1735 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1736 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1737 {
1738 struct pcap_stat stat;
1739
1740 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1741 fprintf(stderr, "Got %u\r", packets_captured);
1742 }
1743 #elif defined(HAVE_ALARM)
1744 static void verbose_stats_dump(int sig _U_)
1745 {
1746 struct pcap_stat stat;
1747
1748 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1749 fprintf(stderr, "Got %u\r", packets_captured);
1750 alarm(1);
1751 }
1752 #endif
1753
1754 static void
1755 usage(void)
1756 {
1757 extern char version[];
1758 #ifndef HAVE_PCAP_LIB_VERSION
1759 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1760 extern char pcap_version[];
1761 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1762 static char pcap_version[] = "unknown";
1763 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1764 #endif /* HAVE_PCAP_LIB_VERSION */
1765
1766 #ifdef HAVE_PCAP_LIB_VERSION
1767 #ifdef WIN32
1768 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1769 #else /* WIN32 */
1770 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1771 #endif /* WIN32 */
1772 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1773 #else /* HAVE_PCAP_LIB_VERSION */
1774 #ifdef WIN32
1775 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1776 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1777 #else /* WIN32 */
1778 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1779 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1780 #endif /* WIN32 */
1781 #endif /* HAVE_PCAP_LIB_VERSION */
1782 (void)fprintf(stderr,
1783 "Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1784 (void)fprintf(stderr,
1785 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1786 (void)fprintf(stderr,
1787 "\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
1788 (void)fprintf(stderr,
1789 "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
1790 (void)fprintf(stderr,
1791 "\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
1792 (void)fprintf(stderr,
1793 "\t\t[ expression ]\n");
1794 exit(1);
1795 }
1796
1797
1798
1799 /* VARARGS */
1800 static void
1801 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1802 {
1803 va_list ap;
1804
1805 (void)fprintf(stderr, "%s: ", program_name);
1806 va_start(ap, fmt);
1807 (void)vfprintf(stderr, fmt, ap);
1808 va_end(ap);
1809 if (*fmt) {
1810 fmt += strlen(fmt);
1811 if (fmt[-1] != '\n')
1812 (void)fputc('\n', stderr);
1813 }
1814 exit(1);
1815 /* NOTREACHED */
1816 }
1817
1818 /* VARARGS */
1819 static void
1820 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1821 {
1822 va_list ap;
1823
1824 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1825 va_start(ap, fmt);
1826 (void)vfprintf(stderr, fmt, ap);
1827 va_end(ap);
1828 if (*fmt) {
1829 fmt += strlen(fmt);
1830 if (fmt[-1] != '\n')
1831 (void)fputc('\n', stderr);
1832 }
1833 }
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