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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 fprintf(stderr, "\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:hi:" 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 'h':
697 ++hflag;
698 break;
699
700 case 'i':
701 if (optarg[0] == '0' && optarg[1] == 0)
702 error("Invalid adapter index");
703
704 #ifdef HAVE_PCAP_FINDALLDEVS
705 /*
706 * If the argument is a number, treat it as
707 * an index into the list of adapters, as
708 * printed by "tcpdump -D".
709 *
710 * This should be OK on UNIX systems, as interfaces
711 * shouldn't have names that begin with digits.
712 * It can be useful on Windows, where more than
713 * one interface can have the same name.
714 */
715 if ((devnum = atoi(optarg)) != 0) {
716 if (devnum < 0)
717 error("Invalid adapter index");
718
719 if (pcap_findalldevs(&devpointer, ebuf) < 0)
720 error("%s", ebuf);
721 else {
722 /*
723 * Look for the devnum-th entry
724 * in the list of devices
725 * (1-based).
726 */
727 for (i = 0;
728 i < devnum-1 && devpointer != NULL;
729 i++, devpointer = devpointer->next)
730 ;
731 if (devpointer == NULL)
732 error("Invalid adapter index");
733 }
734 device = devpointer->name;
735 break;
736 }
737 #endif /* HAVE_PCAP_FINDALLDEVS */
738 device = optarg;
739 break;
740
741 #ifdef HAVE_PCAP_CREATE
742 case 'I':
743 ++Iflag;
744 break;
745 #endif /* HAVE_PCAP_CREATE */
746
747 case 'l':
748 #ifdef WIN32
749 /*
750 * _IOLBF is the same as _IOFBF in Microsoft's C
751 * libraries; the only alternative they offer
752 * is _IONBF.
753 *
754 * XXX - this should really be checking for MSVC++,
755 * not WIN32, if, for example, MinGW has its own
756 * C library that is more UNIX-compatible.
757 */
758 setvbuf(stdout, NULL, _IONBF, 0);
759 #else /* WIN32 */
760 #ifdef HAVE_SETLINEBUF
761 setlinebuf(stdout);
762 #else
763 setvbuf(stdout, NULL, _IOLBF, 0);
764 #endif
765 #endif /* WIN32 */
766 break;
767
768 case 'K':
769 ++Kflag;
770 break;
771
772 case 'm':
773 #ifdef LIBSMI
774 if (smiLoadModule(optarg) == 0) {
775 error("could not load MIB module %s", optarg);
776 }
777 sflag = 1;
778 #else
779 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
780 program_name, optarg);
781 (void)fprintf(stderr, "(no libsmi support)\n");
782 #endif
783 break;
784
785 case 'M':
786 /* TCP-MD5 shared secret */
787 #ifndef HAVE_LIBCRYPTO
788 warning("crypto code not compiled in");
789 #endif
790 sigsecret = optarg;
791 break;
792
793 case 'n':
794 ++nflag;
795 break;
796
797 case 'N':
798 ++Nflag;
799 break;
800
801 case 'O':
802 Oflag = 0;
803 break;
804
805 case 'p':
806 ++pflag;
807 break;
808
809 case 'q':
810 ++qflag;
811 ++suppress_default_print;
812 break;
813
814 case 'r':
815 RFileName = optarg;
816 break;
817
818 case 'R':
819 Rflag = 0;
820 break;
821
822 case 's': {
823 char *end;
824
825 snaplen = strtol(optarg, &end, 0);
826 if (optarg == end || *end != '\0'
827 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
828 error("invalid snaplen %s", optarg);
829 else if (snaplen == 0)
830 snaplen = MAXIMUM_SNAPLEN;
831 break;
832 }
833
834 case 'S':
835 ++Sflag;
836 break;
837
838 case 't':
839 ++tflag;
840 break;
841
842 case 'T':
843 if (strcasecmp(optarg, "vat") == 0)
844 packettype = PT_VAT;
845 else if (strcasecmp(optarg, "wb") == 0)
846 packettype = PT_WB;
847 else if (strcasecmp(optarg, "rpc") == 0)
848 packettype = PT_RPC;
849 else if (strcasecmp(optarg, "rtp") == 0)
850 packettype = PT_RTP;
851 else if (strcasecmp(optarg, "rtcp") == 0)
852 packettype = PT_RTCP;
853 else if (strcasecmp(optarg, "snmp") == 0)
854 packettype = PT_SNMP;
855 else if (strcasecmp(optarg, "cnfp") == 0)
856 packettype = PT_CNFP;
857 else if (strcasecmp(optarg, "tftp") == 0)
858 packettype = PT_TFTP;
859 else if (strcasecmp(optarg, "aodv") == 0)
860 packettype = PT_AODV;
861 else
862 error("unknown packet type `%s'", optarg);
863 break;
864
865 case 'u':
866 ++uflag;
867 break;
868
869 #ifdef HAVE_PCAP_DUMP_FLUSH
870 case 'U':
871 ++Uflag;
872 break;
873 #endif
874
875 case 'v':
876 ++vflag;
877 break;
878
879 case 'w':
880 WFileName = optarg;
881 break;
882
883 case 'W':
884 Wflag = atoi(optarg);
885 if (Wflag < 0)
886 error("invalid number of output files %s", optarg);
887 WflagChars = getWflagChars(Wflag);
888 break;
889
890 case 'x':
891 ++xflag;
892 ++suppress_default_print;
893 break;
894
895 case 'X':
896 ++Xflag;
897 ++suppress_default_print;
898 break;
899
900 case 'y':
901 gndo->ndo_dltname = optarg;
902 gndo->ndo_dlt =
903 pcap_datalink_name_to_val(gndo->ndo_dltname);
904 if (gndo->ndo_dlt < 0)
905 error("invalid data link type %s", gndo->ndo_dltname);
906 break;
907
908 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
909 case 'Y':
910 {
911 /* Undocumented flag */
912 #ifdef HAVE_PCAP_DEBUG
913 extern int pcap_debug;
914 pcap_debug = 1;
915 #else
916 extern int yydebug;
917 yydebug = 1;
918 #endif
919 }
920 break;
921 #endif
922 case 'z':
923 if (optarg) {
924 zflag = strdup(optarg);
925 } else {
926 usage();
927 /* NOTREACHED */
928 }
929 break;
930
931 case 'Z':
932 if (optarg) {
933 username = strdup(optarg);
934 }
935 else {
936 usage();
937 /* NOTREACHED */
938 }
939 break;
940
941 default:
942 usage();
943 /* NOTREACHED */
944 }
945
946 switch (tflag) {
947
948 case 0: /* Default */
949 case 4: /* Default + Date*/
950 thiszone = gmt2local(0);
951 break;
952
953 case 1: /* No time stamp */
954 case 2: /* Unix timeval style */
955 case 3: /* Microseconds since previous packet */
956 case 5: /* Microseconds since first packet */
957 break;
958
959 default: /* Not supported */
960 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
961 break;
962 }
963
964 #ifdef WITH_CHROOT
965 /* if run as root, prepare for chrooting */
966 if (getuid() == 0 || geteuid() == 0) {
967 /* future extensibility for cmd-line arguments */
968 if (!chroot_dir)
969 chroot_dir = WITH_CHROOT;
970 }
971 #endif
972
973 #ifdef WITH_USER
974 /* if run as root, prepare for dropping root privileges */
975 if (getuid() == 0 || geteuid() == 0) {
976 /* Run with '-Z root' to restore old behaviour */
977 if (!username)
978 username = WITH_USER;
979 }
980 #endif
981
982 if (RFileName != NULL) {
983 int dlt;
984 const char *dlt_name;
985
986 #ifndef WIN32
987 /*
988 * We don't need network access, so relinquish any set-UID
989 * or set-GID privileges we have (if any).
990 *
991 * We do *not* want set-UID privileges when opening a
992 * trace file, as that might let the user read other
993 * people's trace files (especially if we're set-UID
994 * root).
995 */
996 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
997 fprintf(stderr, "Warning: setgid/setuid failed !\n");
998 #endif /* WIN32 */
999 pd = pcap_open_offline(RFileName, ebuf);
1000 if (pd == NULL)
1001 error("%s", ebuf);
1002 dlt = pcap_datalink(pd);
1003 dlt_name = pcap_datalink_val_to_name(dlt);
1004 if (dlt_name == NULL) {
1005 fprintf(stderr, "reading from file %s, link-type %u\n",
1006 RFileName, dlt);
1007 } else {
1008 fprintf(stderr,
1009 "reading from file %s, link-type %s (%s)\n",
1010 RFileName, dlt_name,
1011 pcap_datalink_val_to_description(dlt));
1012 }
1013 localnet = 0;
1014 netmask = 0;
1015 if (fflag != 0)
1016 error("-f and -r options are incompatible");
1017 } else {
1018 if (device == NULL) {
1019 device = pcap_lookupdev(ebuf);
1020 if (device == NULL)
1021 error("%s", ebuf);
1022 }
1023 #ifdef WIN32
1024 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1025 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1026 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1027 }
1028 else
1029 {
1030 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1031 }
1032
1033 fflush(stderr);
1034 #endif /* WIN32 */
1035 #ifdef HAVE_PCAP_CREATE
1036 pd = pcap_create(device, ebuf);
1037 if (pd == NULL)
1038 error("%s", ebuf);
1039 /*
1040 * Is this an interface that supports monitor mode?
1041 */
1042 if (pcap_can_set_rfmon(pd) == 1)
1043 supports_monitor_mode = 1;
1044 else
1045 supports_monitor_mode = 0;
1046 status = pcap_set_snaplen(pd, snaplen);
1047 if (status != 0)
1048 error("%s: pcap_set_snaplen failed: %s",
1049 device, pcap_statustostr(status));
1050 status = pcap_set_promisc(pd, !pflag);
1051 if (status != 0)
1052 error("%s: pcap_set_promisc failed: %s",
1053 device, pcap_statustostr(status));
1054 if (Iflag) {
1055 status = pcap_set_rfmon(pd, 1);
1056 if (status != 0)
1057 error("%s: pcap_set_rfmon failed: %s",
1058 device, pcap_statustostr(status));
1059 }
1060 status = pcap_set_timeout(pd, 1000);
1061 if (status != 0)
1062 error("%s: pcap_set_timeout failed: %s",
1063 device, pcap_statustostr(status));
1064 if (Bflag != 0) {
1065 status = pcap_set_buffer_size(pd, Bflag);
1066 if (status != 0)
1067 error("%s: pcap_set_buffer_size failed: %s",
1068 device, pcap_statustostr(status));
1069 }
1070 status = pcap_activate(pd);
1071 if (status < 0) {
1072 /*
1073 * pcap_activate() failed.
1074 */
1075 cp = pcap_geterr(pd);
1076 if (status == PCAP_ERROR)
1077 error("%s", cp);
1078 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1079 status == PCAP_ERROR_PERM_DENIED) &&
1080 *cp != '\0')
1081 error("%s: %s\n(%s)", device,
1082 pcap_statustostr(status), cp);
1083 else
1084 error("%s: %s", device,
1085 pcap_statustostr(status));
1086 } else if (status > 0) {
1087 /*
1088 * pcap_activate() succeeded, but it's warning us
1089 * of a problem it had.
1090 */
1091 cp = pcap_geterr(pd);
1092 if (status == PCAP_WARNING)
1093 warning("%s", cp);
1094 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1095 *cp != '\0')
1096 warning("%s: %s\n(%s)", device,
1097 pcap_statustostr(status), cp);
1098 else
1099 warning("%s: %s", device,
1100 pcap_statustostr(status));
1101 }
1102 #else
1103 *ebuf = '\0';
1104 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1105 if (pd == NULL)
1106 error("%s", ebuf);
1107 else if (*ebuf)
1108 warning("%s", ebuf);
1109 #endif /* HAVE_PCAP_CREATE */
1110 /*
1111 * Let user own process after socket has been opened.
1112 */
1113 #ifndef WIN32
1114 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1115 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1116 #endif /* WIN32 */
1117 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1118 if(Bflag != 0)
1119 if(pcap_setbuff(pd, Bflag)==-1){
1120 error("%s", pcap_geterr(pd));
1121 }
1122 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1123 if (Lflag)
1124 show_dlts_and_exit(device, pd);
1125 if (gndo->ndo_dlt >= 0) {
1126 #ifdef HAVE_PCAP_SET_DATALINK
1127 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1128 error("%s", pcap_geterr(pd));
1129 #else
1130 /*
1131 * We don't actually support changing the
1132 * data link type, so we only let them
1133 * set it to what it already is.
1134 */
1135 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1136 error("%s is not one of the DLTs supported by this device\n",
1137 gndo->ndo_dltname);
1138 }
1139 #endif
1140 (void)fprintf(stderr, "%s: data link type %s\n",
1141 program_name, gndo->ndo_dltname);
1142 (void)fflush(stderr);
1143 }
1144 i = pcap_snapshot(pd);
1145 if (snaplen < i) {
1146 warning("snaplen raised from %d to %d", snaplen, i);
1147 snaplen = i;
1148 }
1149 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1150 localnet = 0;
1151 netmask = 0;
1152 warning("%s", ebuf);
1153 }
1154 }
1155 if (infile)
1156 cmdbuf = read_infile(infile);
1157 else
1158 cmdbuf = copy_argv(&argv[optind]);
1159
1160 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1161 error("%s", pcap_geterr(pd));
1162 free(cmdbuf);
1163 if (dflag) {
1164 bpf_dump(&fcode, dflag);
1165 pcap_close(pd);
1166 exit(0);
1167 }
1168 init_addrtoname(localnet, netmask);
1169 init_checksum();
1170
1171 #ifndef WIN32
1172 (void)setsignal(SIGPIPE, cleanup);
1173 (void)setsignal(SIGTERM, cleanup);
1174 (void)setsignal(SIGINT, cleanup);
1175 (void)setsignal(SIGCHLD, child_cleanup);
1176 #endif /* WIN32 */
1177 /* Cooperate with nohup(1) */
1178 #ifndef WIN32
1179 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1180 (void)setsignal(SIGHUP, oldhandler);
1181 #endif /* WIN32 */
1182
1183 if (pcap_setfilter(pd, &fcode) < 0)
1184 error("%s", pcap_geterr(pd));
1185 if (WFileName) {
1186 pcap_dumper_t *p;
1187 /* Do not exceed the default NAME_MAX for files. */
1188 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1189
1190 if (dumpinfo.CurrentFileName == NULL)
1191 error("malloc of dumpinfo.CurrentFileName");
1192
1193 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1194 if (Cflag != 0)
1195 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1196 else
1197 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1198
1199 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1200 if (p == NULL)
1201 error("%s", pcap_geterr(pd));
1202 if (Cflag != 0 || Gflag != 0) {
1203 callback = dump_packet_and_trunc;
1204 dumpinfo.WFileName = WFileName;
1205 dumpinfo.pd = pd;
1206 dumpinfo.p = p;
1207 pcap_userdata = (u_char *)&dumpinfo;
1208 } else {
1209 callback = dump_packet;
1210 pcap_userdata = (u_char *)p;
1211 }
1212 } else {
1213 type = pcap_datalink(pd);
1214 printinfo.ndo_type = 1;
1215 printinfo.ndo = gndo;
1216 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1217 if (printinfo.p.ndo_printer == NULL) {
1218 printinfo.p.printer = lookup_printer(type);
1219 printinfo.ndo_type = 0;
1220 if (printinfo.p.printer == NULL) {
1221 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1222 if (gndo->ndo_dltname != NULL)
1223 error("packet printing is not supported for link type %s: use -w",
1224 gndo->ndo_dltname);
1225 else
1226 error("packet printing is not supported for link type %d: use -w", type);
1227 }
1228 }
1229 callback = print_packet;
1230 pcap_userdata = (u_char *)&printinfo;
1231 }
1232 #ifndef WIN32
1233 /*
1234 * We cannot do this earlier, because we want to be able to open
1235 * the file (if done) for writing before giving up permissions.
1236 */
1237 if (getuid() == 0 || geteuid() == 0) {
1238 if (username || chroot_dir)
1239 droproot(username, chroot_dir);
1240 }
1241 #endif /* WIN32 */
1242 #ifdef SIGINFO
1243 /*
1244 * We can't get statistics when reading from a file rather
1245 * than capturing from a device.
1246 */
1247 if (RFileName == NULL)
1248 (void)setsignal(SIGINFO, requestinfo);
1249 #endif
1250
1251 if (vflag > 0 && WFileName) {
1252 /*
1253 * When capturing to a file, "-v" means tcpdump should,
1254 * every 10 secodns, "v"erbosely report the number of
1255 * packets captured.
1256 */
1257 #ifdef USE_WIN32_MM_TIMER
1258 /* call verbose_stats_dump() each 1000 +/-100msec */
1259 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1260 setvbuf(stderr, NULL, _IONBF, 0);
1261 #elif defined(HAVE_ALARM)
1262 (void)setsignal(SIGALRM, verbose_stats_dump);
1263 alarm(1);
1264 #endif
1265 }
1266
1267 #ifndef WIN32
1268 if (RFileName == NULL) {
1269 int dlt;
1270 const char *dlt_name;
1271
1272 if (!vflag && !WFileName) {
1273 (void)fprintf(stderr,
1274 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1275 program_name);
1276 } else
1277 (void)fprintf(stderr, "%s: ", program_name);
1278 dlt = pcap_datalink(pd);
1279 dlt_name = pcap_datalink_val_to_name(dlt);
1280 if (dlt_name == NULL) {
1281 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1282 device, dlt, snaplen);
1283 } else {
1284 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1285 device, dlt_name,
1286 pcap_datalink_val_to_description(dlt), snaplen);
1287 }
1288 (void)fflush(stderr);
1289 }
1290 #endif /* WIN32 */
1291 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1292 if (WFileName == NULL) {
1293 /*
1294 * We're printing packets. Flush the printed output,
1295 * so it doesn't get intermingled with error output.
1296 */
1297 if (status == -2) {
1298 /*
1299 * We got interrupted, so perhaps we didn't
1300 * manage to finish a line we were printing.
1301 * Print an extra newline, just in case.
1302 */
1303 putchar('\n');
1304 }
1305 (void)fflush(stdout);
1306 }
1307 if (status == -1) {
1308 /*
1309 * Error. Report it.
1310 */
1311 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1312 program_name, pcap_geterr(pd));
1313 }
1314 if (RFileName == NULL) {
1315 /*
1316 * We're doing a live capture. Report the capture
1317 * statistics.
1318 */
1319 info(1);
1320 }
1321 pcap_close(pd);
1322 exit(status == -1 ? 1 : 0);
1323 }
1324
1325 /* make a clean exit on interrupts */
1326 static RETSIGTYPE
1327 cleanup(int signo _U_)
1328 {
1329 #ifdef USE_WIN32_MM_TIMER
1330 if (timer_id)
1331 timeKillEvent(timer_id);
1332 timer_id = 0;
1333 #elif defined(HAVE_ALARM)
1334 alarm(0);
1335 #endif
1336
1337 #ifdef HAVE_PCAP_BREAKLOOP
1338 /*
1339 * We have "pcap_breakloop()"; use it, so that we do as little
1340 * as possible in the signal handler (it's probably not safe
1341 * to do anything with standard I/O streams in a signal handler -
1342 * the ANSI C standard doesn't say it is).
1343 */
1344 pcap_breakloop(pd);
1345 #else
1346 /*
1347 * We don't have "pcap_breakloop()"; this isn't safe, but
1348 * it's the best we can do. Print the summary if we're
1349 * not reading from a savefile - i.e., if we're doing a
1350 * live capture - and exit.
1351 */
1352 if (pd != NULL && pcap_file(pd) == NULL) {
1353 /*
1354 * We got interrupted, so perhaps we didn't
1355 * manage to finish a line we were printing.
1356 * Print an extra newline, just in case.
1357 */
1358 putchar('\n');
1359 (void)fflush(stdout);
1360 info(1);
1361 }
1362 exit(0);
1363 #endif
1364 }
1365
1366 /*
1367 On windows, we do not use a fork, so we do not care less about
1368 waiting a child processes to die
1369 */
1370 #ifndef WIN32
1371 static RETSIGTYPE
1372 child_cleanup(int signo _U_)
1373 {
1374 wait(NULL);
1375 }
1376 #endif /* WIN32 */
1377
1378 static void
1379 info(register int verbose)
1380 {
1381 struct pcap_stat stat;
1382
1383 /*
1384 * Older versions of libpcap didn't set ps_ifdrop on some
1385 * platforms; initialize it to 0 to handle that.
1386 */
1387 stat.ps_ifdrop = 0;
1388 if (pcap_stats(pd, &stat) < 0) {
1389 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1390 infoprint = 0;
1391 return;
1392 }
1393
1394 if (!verbose)
1395 fprintf(stderr, "%s: ", program_name);
1396
1397 (void)fprintf(stderr, "%u packets captured", packets_captured);
1398 if (!verbose)
1399 fputs(", ", stderr);
1400 else
1401 putc('\n', stderr);
1402 (void)fprintf(stderr, "%u packets received by filter", stat.ps_recv);
1403 if (!verbose)
1404 fputs(", ", stderr);
1405 else
1406 putc('\n', stderr);
1407 (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop);
1408 if (stat.ps_ifdrop != 0) {
1409 if (!verbose)
1410 fputs(", ", stderr);
1411 else
1412 putc('\n', stderr);
1413 (void)fprintf(stderr, "%u packets dropped by interface\n",
1414 stat.ps_ifdrop);
1415 } else
1416 putc('\n', stderr);
1417 infoprint = 0;
1418 }
1419
1420 #ifndef WIN32
1421 static void
1422 compress_savefile(const char *filename)
1423 {
1424 if (fork())
1425 return;
1426 /*
1427 * Set to lowest priority so that this doesn't disturb the capture
1428 */
1429 #ifdef NZERO
1430 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1431 #else
1432 setpriority(PRIO_PROCESS, 0, 19);
1433 #endif
1434 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1435 fprintf(stderr,
1436 "compress_savefile:execlp(%s, %s): %s\n",
1437 zflag,
1438 filename,
1439 strerror(errno));
1440 }
1441 #else /* WIN32 */
1442 static void
1443 compress_savefile(const char *filename)
1444 {
1445 fprintf(stderr,
1446 "compress_savefile failed. Functionality not implemented under windows\n");
1447 }
1448 #endif /* WIN32 */
1449
1450 static void
1451 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1452 {
1453 struct dump_info *dump_info;
1454
1455 ++packets_captured;
1456
1457 ++infodelay;
1458
1459 dump_info = (struct dump_info *)user;
1460
1461 /*
1462 * XXX - this won't force the file to rotate on the specified time
1463 * boundary, but it will rotate on the first packet received after the
1464 * specified Gflag number of seconds. Note: if a Gflag time boundary
1465 * and a Cflag size boundary coincide, the time rotation will occur
1466 * first thereby cancelling the Cflag boundary (since the file should
1467 * be 0).
1468 */
1469 if (Gflag != 0) {
1470 /* Check if it is time to rotate */
1471 time_t t;
1472
1473 /* Get the current time */
1474 if ((t = time(NULL)) == (time_t)-1) {
1475 error("dump_and_trunc_packet: can't get current_time: %s",
1476 pcap_strerror(errno));
1477 }
1478
1479
1480 /* If the time is greater than the specified window, rotate */
1481 if (t - Gflag_time >= Gflag) {
1482 /* Update the Gflag_time */
1483 Gflag_time = t;
1484 /* Update Gflag_count */
1485 Gflag_count++;
1486 /*
1487 * Close the current file and open a new one.
1488 */
1489 pcap_dump_close(dump_info->p);
1490
1491 /*
1492 * Compress the file we just closed, if the user asked for it
1493 */
1494 if (zflag != NULL)
1495 compress_savefile(dump_info->CurrentFileName);
1496
1497 /*
1498 * Check to see if we've exceeded the Wflag (when
1499 * not using Cflag).
1500 */
1501 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1502 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1503 Wflag);
1504 exit(0);
1505 /* NOTREACHED */
1506 }
1507 if (dump_info->CurrentFileName != NULL)
1508 free(dump_info->CurrentFileName);
1509 /* Allocate space for max filename + \0. */
1510 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1511 if (dump_info->CurrentFileName == NULL)
1512 error("dump_packet_and_trunc: malloc");
1513 /*
1514 * This is always the first file in the Cflag
1515 * rotation: e.g. 0
1516 * We also don't need numbering if Cflag is not set.
1517 */
1518 if (Cflag != 0)
1519 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1520 WflagChars);
1521 else
1522 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1523
1524 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1525 if (dump_info->p == NULL)
1526 error("%s", pcap_geterr(pd));
1527 }
1528 }
1529
1530 /*
1531 * XXX - this won't prevent capture files from getting
1532 * larger than Cflag - the last packet written to the
1533 * file could put it over Cflag.
1534 */
1535 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1536 /*
1537 * Close the current file and open a new one.
1538 */
1539 pcap_dump_close(dump_info->p);
1540
1541 /*
1542 * Compress the file we just closed, if the user asked for it
1543 */
1544 if (zflag != NULL)
1545 compress_savefile(dump_info->CurrentFileName);
1546
1547 Cflag_count++;
1548 if (Wflag > 0) {
1549 if (Cflag_count >= Wflag)
1550 Cflag_count = 0;
1551 }
1552 if (dump_info->CurrentFileName != NULL)
1553 free(dump_info->CurrentFileName);
1554 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1555 if (dump_info->CurrentFileName == NULL)
1556 error("dump_packet_and_trunc: malloc");
1557 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1558 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1559 if (dump_info->p == NULL)
1560 error("%s", pcap_geterr(pd));
1561 }
1562
1563 pcap_dump((u_char *)dump_info->p, h, sp);
1564 #ifdef HAVE_PCAP_DUMP_FLUSH
1565 if (Uflag)
1566 pcap_dump_flush(dump_info->p);
1567 #endif
1568
1569 --infodelay;
1570 if (infoprint)
1571 info(0);
1572 }
1573
1574 static void
1575 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1576 {
1577 ++packets_captured;
1578
1579 ++infodelay;
1580
1581 pcap_dump(user, h, sp);
1582 #ifdef HAVE_PCAP_DUMP_FLUSH
1583 if (Uflag)
1584 pcap_dump_flush((pcap_dumper_t *)user);
1585 #endif
1586
1587 --infodelay;
1588 if (infoprint)
1589 info(0);
1590 }
1591
1592 static void
1593 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1594 {
1595 struct print_info *print_info;
1596 u_int hdrlen;
1597
1598 ++packets_captured;
1599
1600 ++infodelay;
1601 ts_print(&h->ts);
1602
1603 print_info = (struct print_info *)user;
1604
1605 /*
1606 * Some printers want to check that they're not walking off the
1607 * end of the packet.
1608 * Rather than pass it all the way down, we set this global.
1609 */
1610 snapend = sp + h->caplen;
1611
1612 if(print_info->ndo_type) {
1613 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1614 } else {
1615 hdrlen = (*print_info->p.printer)(h, sp);
1616 }
1617
1618 if (Xflag) {
1619 /*
1620 * Print the raw packet data in hex and ASCII.
1621 */
1622 if (Xflag > 1) {
1623 /*
1624 * Include the link-layer header.
1625 */
1626 hex_and_ascii_print("\n\t", sp, h->caplen);
1627 } else {
1628 /*
1629 * Don't include the link-layer header - and if
1630 * we have nothing past the link-layer header,
1631 * print nothing.
1632 */
1633 if (h->caplen > hdrlen)
1634 hex_and_ascii_print("\n\t", sp + hdrlen,
1635 h->caplen - hdrlen);
1636 }
1637 } else if (xflag) {
1638 /*
1639 * Print the raw packet data in hex.
1640 */
1641 if (xflag > 1) {
1642 /*
1643 * Include the link-layer header.
1644 */
1645 hex_print("\n\t", sp, h->caplen);
1646 } else {
1647 /*
1648 * Don't include the link-layer header - and if
1649 * we have nothing past the link-layer header,
1650 * print nothing.
1651 */
1652 if (h->caplen > hdrlen)
1653 hex_print("\n\t", sp + hdrlen,
1654 h->caplen - hdrlen);
1655 }
1656 } else if (Aflag) {
1657 /*
1658 * Print the raw packet data in ASCII.
1659 */
1660 if (Aflag > 1) {
1661 /*
1662 * Include the link-layer header.
1663 */
1664 ascii_print(sp, h->caplen);
1665 } else {
1666 /*
1667 * Don't include the link-layer header - and if
1668 * we have nothing past the link-layer header,
1669 * print nothing.
1670 */
1671 if (h->caplen > hdrlen)
1672 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1673 }
1674 }
1675
1676 putchar('\n');
1677
1678 --infodelay;
1679 if (infoprint)
1680 info(0);
1681 }
1682
1683 #ifdef WIN32
1684 /*
1685 * XXX - there should really be libpcap calls to get the version
1686 * number as a string (the string would be generated from #defines
1687 * at run time, so that it's not generated from string constants
1688 * in the library, as, on many UNIX systems, those constants would
1689 * be statically linked into the application executable image, and
1690 * would thus reflect the version of libpcap on the system on
1691 * which the application was *linked*, not the system on which it's
1692 * *running*.
1693 *
1694 * That routine should be documented, unlike the "version[]"
1695 * string, so that UNIX vendors providing their own libpcaps
1696 * don't omit it (as a couple of vendors have...).
1697 *
1698 * Packet.dll should perhaps also export a routine to return the
1699 * version number of the Packet.dll code, to supply the
1700 * "Wpcap_version" information on Windows.
1701 */
1702 char WDversion[]="current-cvs.tcpdump.org";
1703 #if !defined(HAVE_GENERATED_VERSION)
1704 char version[]="current-cvs.tcpdump.org";
1705 #endif
1706 char pcap_version[]="current-cvs.tcpdump.org";
1707 char Wpcap_version[]="3.1";
1708 #endif
1709
1710 /*
1711 * By default, print the specified data out in hex and ASCII.
1712 */
1713 static void
1714 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1715 {
1716 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1717 }
1718
1719 void
1720 default_print(const u_char *bp, u_int length)
1721 {
1722 ndo_default_print(gndo, bp, length);
1723 }
1724
1725 #ifdef SIGINFO
1726 RETSIGTYPE requestinfo(int signo _U_)
1727 {
1728 if (infodelay)
1729 ++infoprint;
1730 else
1731 info(0);
1732 }
1733 #endif
1734
1735 /*
1736 * Called once each second in verbose mode while dumping to file
1737 */
1738 #ifdef USE_WIN32_MM_TIMER
1739 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1740 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1741 {
1742 struct pcap_stat stat;
1743
1744 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1745 fprintf(stderr, "Got %u\r", packets_captured);
1746 }
1747 #elif defined(HAVE_ALARM)
1748 static void verbose_stats_dump(int sig _U_)
1749 {
1750 struct pcap_stat stat;
1751
1752 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1753 fprintf(stderr, "Got %u\r", packets_captured);
1754 alarm(1);
1755 }
1756 #endif
1757
1758 static void
1759 usage(void)
1760 {
1761 extern char version[];
1762 #ifndef HAVE_PCAP_LIB_VERSION
1763 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1764 extern char pcap_version[];
1765 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1766 static char pcap_version[] = "unknown";
1767 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1768 #endif /* HAVE_PCAP_LIB_VERSION */
1769
1770 #ifdef HAVE_PCAP_LIB_VERSION
1771 #ifdef WIN32
1772 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1773 #else /* WIN32 */
1774 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1775 #endif /* WIN32 */
1776 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1777 #else /* HAVE_PCAP_LIB_VERSION */
1778 #ifdef WIN32
1779 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1780 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1781 #else /* WIN32 */
1782 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1783 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1784 #endif /* WIN32 */
1785 #endif /* HAVE_PCAP_LIB_VERSION */
1786 (void)fprintf(stderr,
1787 "Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1788 (void)fprintf(stderr,
1789 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1790 (void)fprintf(stderr,
1791 "\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
1792 (void)fprintf(stderr,
1793 "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
1794 (void)fprintf(stderr,
1795 "\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
1796 (void)fprintf(stderr,
1797 "\t\t[ expression ]\n");
1798 exit(1);
1799 }
1800
1801
1802
1803 /* VARARGS */
1804 static void
1805 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1806 {
1807 va_list ap;
1808
1809 (void)fprintf(stderr, "%s: ", program_name);
1810 va_start(ap, fmt);
1811 (void)vfprintf(stderr, fmt, ap);
1812 va_end(ap);
1813 if (*fmt) {
1814 fmt += strlen(fmt);
1815 if (fmt[-1] != '\n')
1816 (void)fputc('\n', stderr);
1817 }
1818 exit(1);
1819 /* NOTREACHED */
1820 }
1821
1822 /* VARARGS */
1823 static void
1824 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1825 {
1826 va_list ap;
1827
1828 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1829 va_start(ap, fmt);
1830 (void)vfprintf(stderr, fmt, ap);
1831 va_end(ap);
1832 if (*fmt) {
1833 fmt += strlen(fmt);
1834 if (fmt[-1] != '\n')
1835 (void)fputc('\n', stderr);
1836 }
1837 }
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