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Merge branch 'master' of git+ssh://bpf.tcpdump.org/tcpdump/master/git/tcpdump
[tcpdump] / tcpdump.c
1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Support for splitting captures into multiple files with a maximum
22 * file size:
23 *
24 * Copyright (c) 2001
25 * Seth Webster <swebster@sst.ll.mit.edu>
26 */
27
28 #ifndef lint
29 static const char copyright[] _U_ =
30 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
31 The Regents of the University of California. All rights reserved.\n";
32 static const char rcsid[] _U_ =
33 "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)";
34 #endif
35
36 /*
37 * tcpdump - monitor tcp/ip traffic on an ethernet.
38 *
39 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
40 * Mercilessly hacked and occasionally improved since then via the
41 * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
42 */
43
44 #ifdef HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47
48 #include <tcpdump-stdinc.h>
49
50 #ifdef WIN32
51 #include "getopt.h"
52 #include "w32_fzs.h"
53 extern int strcasecmp (const char *__s1, const char *__s2);
54 extern int SIZE_BUF;
55 #define off_t long
56 #define uint UINT
57 #endif /* WIN32 */
58
59 #ifdef HAVE_SMI_H
60 #include <smi.h>
61 #endif
62
63 #include <pcap.h>
64 #include <signal.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #include <limits.h>
69 #ifndef WIN32
70 #include <sys/wait.h>
71 #include <sys/resource.h>
72 #include <pwd.h>
73 #include <grp.h>
74 #include <errno.h>
75 #endif /* WIN32 */
76
77
78 #include "netdissect.h"
79 #include "interface.h"
80 #include "addrtoname.h"
81 #include "machdep.h"
82 #include "setsignal.h"
83 #include "gmt2local.h"
84 #include "pcap-missing.h"
85
86 #ifndef NAME_MAX
87 #define NAME_MAX 255
88 #endif
89
90 netdissect_options Gndo;
91 netdissect_options *gndo = &Gndo;
92
93 static int dflag; /* print filter code */
94 static int Lflag; /* list available data link types and exit */
95 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
96
97 static int infodelay;
98 static int infoprint;
99
100 char *program_name;
101
102 int32_t thiszone; /* seconds offset from gmt to local time */
103
104 /* Forwards */
105 static RETSIGTYPE cleanup(int);
106 static RETSIGTYPE child_cleanup(int);
107 static void usage(void) __attribute__((noreturn));
108 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
109
110 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
111 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
112 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
113 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
114 static void droproot(const char *, const char *);
115 static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
116 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
117
118 #ifdef SIGINFO
119 RETSIGTYPE requestinfo(int);
120 #endif
121
122 #if defined(USE_WIN32_MM_TIMER)
123 #include <MMsystem.h>
124 static UINT timer_id;
125 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
126 #elif defined(HAVE_ALARM)
127 static void verbose_stats_dump(int sig);
128 #endif
129
130 static void info(int);
131 static u_int packets_captured;
132
133 typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
134 typedef u_int (*if_ndo_printer)(struct netdissect_options *ndo,
135 const struct pcap_pkthdr *, const u_char *);
136
137 struct printer {
138 if_printer f;
139 int type;
140 };
141
142
143 struct ndo_printer {
144 if_ndo_printer f;
145 int type;
146 };
147
148
149 static struct printer printers[] = {
150 { arcnet_if_print, DLT_ARCNET },
151 #ifdef DLT_ARCNET_LINUX
152 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
153 #endif
154 { ether_if_print, DLT_EN10MB },
155 { token_if_print, DLT_IEEE802 },
156 #ifdef DLT_LANE8023
157 { lane_if_print, DLT_LANE8023 },
158 #endif
159 #ifdef DLT_CIP
160 { cip_if_print, DLT_CIP },
161 #endif
162 #ifdef DLT_ATM_CLIP
163 { cip_if_print, DLT_ATM_CLIP },
164 #endif
165 { sl_if_print, DLT_SLIP },
166 #ifdef DLT_SLIP_BSDOS
167 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
168 #endif
169 { ppp_if_print, DLT_PPP },
170 #ifdef DLT_PPP_WITHDIRECTION
171 { ppp_if_print, DLT_PPP_WITHDIRECTION },
172 #endif
173 #ifdef DLT_PPP_BSDOS
174 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
175 #endif
176 { fddi_if_print, DLT_FDDI },
177 { null_if_print, DLT_NULL },
178 #ifdef DLT_LOOP
179 { null_if_print, DLT_LOOP },
180 #endif
181 { raw_if_print, DLT_RAW },
182 { atm_if_print, DLT_ATM_RFC1483 },
183 #ifdef DLT_C_HDLC
184 { chdlc_if_print, DLT_C_HDLC },
185 #endif
186 #ifdef DLT_HDLC
187 { chdlc_if_print, DLT_HDLC },
188 #endif
189 #ifdef DLT_PPP_SERIAL
190 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
191 #endif
192 #ifdef DLT_PPP_ETHER
193 { pppoe_if_print, DLT_PPP_ETHER },
194 #endif
195 #ifdef DLT_LINUX_SLL
196 { sll_if_print, DLT_LINUX_SLL },
197 #endif
198 #ifdef DLT_IEEE802_11
199 { ieee802_11_if_print, DLT_IEEE802_11},
200 #endif
201 #ifdef DLT_LTALK
202 { ltalk_if_print, DLT_LTALK },
203 #endif
204 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
205 { pflog_if_print, DLT_PFLOG },
206 #endif
207 #ifdef DLT_FR
208 { fr_if_print, DLT_FR },
209 #endif
210 #ifdef DLT_FRELAY
211 { fr_if_print, DLT_FRELAY },
212 #endif
213 #ifdef DLT_SUNATM
214 { sunatm_if_print, DLT_SUNATM },
215 #endif
216 #ifdef DLT_IP_OVER_FC
217 { ipfc_if_print, DLT_IP_OVER_FC },
218 #endif
219 #ifdef DLT_PRISM_HEADER
220 { prism_if_print, DLT_PRISM_HEADER },
221 #endif
222 #ifdef DLT_IEEE802_11_RADIO
223 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
224 #endif
225 #ifdef DLT_ENC
226 { enc_if_print, DLT_ENC },
227 #endif
228 #ifdef DLT_SYMANTEC_FIREWALL
229 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
230 #endif
231 #ifdef DLT_APPLE_IP_OVER_IEEE1394
232 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
233 #endif
234 #ifdef DLT_IEEE802_11_RADIO_AVS
235 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
236 #endif
237 #ifdef DLT_JUNIPER_ATM1
238 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
239 #endif
240 #ifdef DLT_JUNIPER_ATM2
241 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
242 #endif
243 #ifdef DLT_JUNIPER_MFR
244 { juniper_mfr_print, DLT_JUNIPER_MFR },
245 #endif
246 #ifdef DLT_JUNIPER_MLFR
247 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
248 #endif
249 #ifdef DLT_JUNIPER_MLPPP
250 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
251 #endif
252 #ifdef DLT_JUNIPER_PPPOE
253 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
254 #endif
255 #ifdef DLT_JUNIPER_PPPOE_ATM
256 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
257 #endif
258 #ifdef DLT_JUNIPER_GGSN
259 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
260 #endif
261 #ifdef DLT_JUNIPER_ES
262 { juniper_es_print, DLT_JUNIPER_ES },
263 #endif
264 #ifdef DLT_JUNIPER_MONITOR
265 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
266 #endif
267 #ifdef DLT_JUNIPER_SERVICES
268 { juniper_services_print, DLT_JUNIPER_SERVICES },
269 #endif
270 #ifdef DLT_JUNIPER_ETHER
271 { juniper_ether_print, DLT_JUNIPER_ETHER },
272 #endif
273 #ifdef DLT_JUNIPER_PPP
274 { juniper_ppp_print, DLT_JUNIPER_PPP },
275 #endif
276 #ifdef DLT_JUNIPER_FRELAY
277 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
278 #endif
279 #ifdef DLT_JUNIPER_CHDLC
280 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
281 #endif
282 #ifdef DLT_MFR
283 { mfr_if_print, DLT_MFR },
284 #endif
285 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
286 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
287 #endif
288 #ifdef HAVE_PCAP_USB_H
289 #ifdef DLT_USB_LINUX
290 { usb_linux_48_byte_print, DLT_USB_LINUX},
291 #endif /* DLT_USB_LINUX */
292 #ifdef DLT_USB_LINUX_MMAPPED
293 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
294 #endif /* DLT_USB_LINUX_MMAPPED */
295 #endif /* HAVE_PCAP_USB_H */
296 #ifdef DLT_IPV4
297 { raw_if_print, DLT_IPV4 },
298 #endif
299 #ifdef DLT_IPV6
300 { raw_if_print, DLT_IPV6 },
301 #endif
302 { NULL, 0 },
303 };
304
305 static struct ndo_printer ndo_printers[] = {
306 #ifdef DLT_IPNET
307 { ipnet_if_print, DLT_IPNET },
308 #endif
309 #ifdef DLT_IEEE802_15_4
310 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
311 #endif
312 { NULL, 0 },
313 };
314
315 static if_printer
316 lookup_printer(int type)
317 {
318 struct printer *p;
319
320 for (p = printers; p->f; ++p)
321 if (type == p->type)
322 return p->f;
323
324 return NULL;
325 /* NOTREACHED */
326 }
327
328 static if_ndo_printer
329 lookup_ndo_printer(int type)
330 {
331 struct ndo_printer *p;
332
333 for (p = ndo_printers; p->f; ++p)
334 if (type == p->type)
335 return p->f;
336
337 return NULL;
338 /* NOTREACHED */
339 }
340
341 static pcap_t *pd;
342
343 static int supports_monitor_mode;
344
345 extern int optind;
346 extern int opterr;
347 extern char *optarg;
348
349 struct print_info {
350 netdissect_options *ndo;
351 union {
352 if_printer printer;
353 if_ndo_printer ndo_printer;
354 } p;
355 int ndo_type;
356 };
357
358 struct dump_info {
359 char *WFileName;
360 char *CurrentFileName;
361 pcap_t *pd;
362 pcap_dumper_t *p;
363 };
364
365 static void
366 show_dlts_and_exit(const char *device, pcap_t *pd)
367 {
368 int n_dlts;
369 int *dlts = 0;
370 const char *dlt_name;
371
372 n_dlts = pcap_list_datalinks(pd, &dlts);
373 if (n_dlts < 0)
374 error("%s", pcap_geterr(pd));
375 else if (n_dlts == 0 || !dlts)
376 error("No data link types.");
377
378 /*
379 * If the interface is known to support monitor mode, indicate
380 * whether these are the data link types available when not in
381 * monitor mode, if -I wasn't specified, or when in monitor mode,
382 * when -I was specified (the link-layer types available in
383 * monitor mode might be different from the ones available when
384 * not in monitor mode).
385 */
386 if (supports_monitor_mode)
387 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
388 device,
389 Iflag ? "when in monitor mode" : "when not in monitor mode");
390 else
391 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
392 device);
393
394 while (--n_dlts >= 0) {
395 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
396 if (dlt_name != NULL) {
397 (void) fprintf(stderr, " %s (%s)", dlt_name,
398 pcap_datalink_val_to_description(dlts[n_dlts]));
399
400 /*
401 * OK, does tcpdump handle that type?
402 */
403 if (lookup_printer(dlts[n_dlts]) == NULL
404 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
405 (void) fprintf(stderr, " (printing not supported)");
406 fprintf(stderr, "\n");
407 } else {
408 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
409 dlts[n_dlts]);
410 }
411 }
412 free(dlts);
413 exit(0);
414 }
415
416 /*
417 * Set up flags that might or might not be supported depending on the
418 * version of libpcap we're using.
419 */
420 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
421 #define B_FLAG "B:"
422 #define B_FLAG_USAGE " [ -B size ]"
423 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
424 #define B_FLAG
425 #define B_FLAG_USAGE
426 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
427
428 #ifdef HAVE_PCAP_CREATE
429 #define I_FLAG "I"
430 #else /* HAVE_PCAP_CREATE */
431 #define I_FLAG
432 #endif /* HAVE_PCAP_CREATE */
433
434 #ifdef HAVE_PCAP_FINDALLDEVS
435 #ifndef HAVE_PCAP_IF_T
436 #undef HAVE_PCAP_FINDALLDEVS
437 #endif
438 #endif
439
440 #ifdef HAVE_PCAP_FINDALLDEVS
441 #define D_FLAG "D"
442 #else
443 #define D_FLAG
444 #endif
445
446 #ifdef HAVE_PCAP_DUMP_FLUSH
447 #define U_FLAG "U"
448 #else
449 #define U_FLAG
450 #endif
451
452 #ifndef WIN32
453 /* Drop root privileges and chroot if necessary */
454 static void
455 droproot(const char *username, const char *chroot_dir)
456 {
457 struct passwd *pw = NULL;
458
459 if (chroot_dir && !username) {
460 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
461 exit(1);
462 }
463
464 pw = getpwnam(username);
465 if (pw) {
466 if (chroot_dir) {
467 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
468 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
469 chroot_dir, pcap_strerror(errno));
470 exit(1);
471 }
472 }
473 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
474 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
475 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
476 username,
477 (unsigned long)pw->pw_uid,
478 (unsigned long)pw->pw_gid,
479 pcap_strerror(errno));
480 exit(1);
481 }
482 }
483 else {
484 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
485 username);
486 exit(1);
487 }
488 }
489 #endif /* WIN32 */
490
491 static int
492 getWflagChars(int x)
493 {
494 int c = 0;
495
496 x -= 1;
497 while (x > 0) {
498 c += 1;
499 x /= 10;
500 }
501
502 return c;
503 }
504
505
506 static void
507 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
508 {
509 char *filename = malloc(NAME_MAX + 1);
510
511 /* Process with strftime if Gflag is set. */
512 if (Gflag != 0) {
513 struct tm *local_tm;
514
515 /* Convert Gflag_time to a usable format */
516 if ((local_tm = localtime(&Gflag_time)) == NULL) {
517 error("MakeTimedFilename: localtime");
518 }
519
520 /* There's no good way to detect an error in strftime since a return
521 * value of 0 isn't necessarily failure.
522 */
523 strftime(filename, NAME_MAX, orig_name, local_tm);
524 } else {
525 strncpy(filename, orig_name, NAME_MAX);
526 }
527
528 if (cnt == 0 && max_chars == 0)
529 strncpy(buffer, filename, NAME_MAX + 1);
530 else
531 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
532 /* Report an error if the filename is too large */
533 error("too many output files or filename is too long (> %d)", NAME_MAX);
534 free(filename);
535 }
536
537 static int tcpdump_printf(netdissect_options *ndo _U_,
538 const char *fmt, ...)
539 {
540
541 va_list args;
542 int ret;
543
544 va_start(args, fmt);
545 ret=vfprintf(stdout, fmt, args);
546 va_end(args);
547
548 return ret;
549 }
550
551 int
552 main(int argc, char **argv)
553 {
554 register int cnt, op, i;
555 bpf_u_int32 localnet, netmask;
556 register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
557 pcap_handler callback;
558 int type;
559 struct bpf_program fcode;
560 #ifndef WIN32
561 RETSIGTYPE (*oldhandler)(int);
562 #endif
563 struct print_info printinfo;
564 struct dump_info dumpinfo;
565 u_char *pcap_userdata;
566 char ebuf[PCAP_ERRBUF_SIZE];
567 char *username = NULL;
568 char *chroot_dir = NULL;
569 #ifdef HAVE_PCAP_FINDALLDEVS
570 pcap_if_t *devpointer;
571 int devnum;
572 #endif
573 int status;
574 #ifdef WIN32
575 if(wsockinit() != 0) return 1;
576 #endif /* WIN32 */
577
578 gndo->ndo_Oflag=1;
579 gndo->ndo_Rflag=1;
580 gndo->ndo_dlt=-1;
581 gndo->ndo_default_print=ndo_default_print;
582 gndo->ndo_printf=tcpdump_printf;
583 gndo->ndo_error=ndo_error;
584 gndo->ndo_warning=ndo_warning;
585 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
586
587 cnt = -1;
588 device = NULL;
589 infile = NULL;
590 RFileName = NULL;
591 WFileName = NULL;
592 if ((cp = strrchr(argv[0], '/')) != NULL)
593 program_name = cp + 1;
594 else
595 program_name = argv[0];
596
597 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
598 error("%s", ebuf);
599
600 #ifdef LIBSMI
601 smiInit("tcpdump");
602 #endif
603
604 opterr = 0;
605 while (
606 (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:" I_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
607 switch (op) {
608
609 case 'a':
610 /* compatibility for old -a */
611 break;
612
613 case 'A':
614 ++Aflag;
615 break;
616
617 case 'b':
618 ++bflag;
619 break;
620
621 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
622 case 'B':
623 Bflag = atoi(optarg)*1024;
624 if (Bflag <= 0)
625 error("invalid packet buffer size %s", optarg);
626 break;
627 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
628
629 case 'c':
630 cnt = atoi(optarg);
631 if (cnt <= 0)
632 error("invalid packet count %s", optarg);
633 break;
634
635 case 'C':
636 Cflag = atoi(optarg) * 1000000;
637 if (Cflag < 0)
638 error("invalid file size %s", optarg);
639 break;
640
641 case 'd':
642 ++dflag;
643 break;
644
645 #ifdef HAVE_PCAP_FINDALLDEVS
646 case 'D':
647 if (pcap_findalldevs(&devpointer, ebuf) < 0)
648 error("%s", ebuf);
649 else {
650 for (i = 0; devpointer != 0; i++) {
651 printf("%d.%s", i+1, devpointer->name);
652 if (devpointer->description != NULL)
653 printf(" (%s)", devpointer->description);
654 printf("\n");
655 devpointer = devpointer->next;
656 }
657 }
658 return 0;
659 #endif /* HAVE_PCAP_FINDALLDEVS */
660
661 case 'L':
662 Lflag++;
663 break;
664
665 case 'e':
666 ++eflag;
667 break;
668
669 case 'E':
670 #ifndef HAVE_LIBCRYPTO
671 warning("crypto code not compiled in");
672 #endif
673 gndo->ndo_espsecret = optarg;
674 break;
675
676 case 'f':
677 ++fflag;
678 break;
679
680 case 'F':
681 infile = optarg;
682 break;
683
684 case 'G':
685 Gflag = atoi(optarg);
686 if (Gflag < 0)
687 error("invalid number of seconds %s", optarg);
688
689 /* We will create one file initially. */
690 Gflag_count = 0;
691
692 /* Grab the current time for rotation use. */
693 if ((Gflag_time = time(NULL)) == (time_t)-1) {
694 error("main: can't get current time: %s",
695 pcap_strerror(errno));
696 }
697 break;
698
699 case 'i':
700 if (optarg[0] == '0' && optarg[1] == 0)
701 error("Invalid adapter index");
702
703 #ifdef HAVE_PCAP_FINDALLDEVS
704 /*
705 * If the argument is a number, treat it as
706 * an index into the list of adapters, as
707 * printed by "tcpdump -D".
708 *
709 * This should be OK on UNIX systems, as interfaces
710 * shouldn't have names that begin with digits.
711 * It can be useful on Windows, where more than
712 * one interface can have the same name.
713 */
714 if ((devnum = atoi(optarg)) != 0) {
715 if (devnum < 0)
716 error("Invalid adapter index");
717
718 if (pcap_findalldevs(&devpointer, ebuf) < 0)
719 error("%s", ebuf);
720 else {
721 /*
722 * Look for the devnum-th entry
723 * in the list of devices
724 * (1-based).
725 */
726 for (i = 0;
727 i < devnum-1 && devpointer != NULL;
728 i++, devpointer = devpointer->next)
729 ;
730 if (devpointer == NULL)
731 error("Invalid adapter index");
732 }
733 device = devpointer->name;
734 break;
735 }
736 #endif /* HAVE_PCAP_FINDALLDEVS */
737 device = optarg;
738 break;
739
740 #ifdef HAVE_PCAP_CREATE
741 case 'I':
742 ++Iflag;
743 break;
744 #endif /* HAVE_PCAP_CREATE */
745
746 case 'l':
747 #ifdef WIN32
748 /*
749 * _IOLBF is the same as _IOFBF in Microsoft's C
750 * libraries; the only alternative they offer
751 * is _IONBF.
752 *
753 * XXX - this should really be checking for MSVC++,
754 * not WIN32, if, for example, MinGW has its own
755 * C library that is more UNIX-compatible.
756 */
757 setvbuf(stdout, NULL, _IONBF, 0);
758 #else /* WIN32 */
759 #ifdef HAVE_SETLINEBUF
760 setlinebuf(stdout);
761 #else
762 setvbuf(stdout, NULL, _IOLBF, 0);
763 #endif
764 #endif /* WIN32 */
765 break;
766
767 case 'K':
768 ++Kflag;
769 break;
770
771 case 'm':
772 #ifdef LIBSMI
773 if (smiLoadModule(optarg) == 0) {
774 error("could not load MIB module %s", optarg);
775 }
776 sflag = 1;
777 #else
778 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
779 program_name, optarg);
780 (void)fprintf(stderr, "(no libsmi support)\n");
781 #endif
782 break;
783
784 case 'M':
785 /* TCP-MD5 shared secret */
786 #ifndef HAVE_LIBCRYPTO
787 warning("crypto code not compiled in");
788 #endif
789 sigsecret = optarg;
790 break;
791
792 case 'n':
793 ++nflag;
794 break;
795
796 case 'N':
797 ++Nflag;
798 break;
799
800 case 'O':
801 Oflag = 0;
802 break;
803
804 case 'p':
805 ++pflag;
806 break;
807
808 case 'q':
809 ++qflag;
810 ++suppress_default_print;
811 break;
812
813 case 'r':
814 RFileName = optarg;
815 break;
816
817 case 'R':
818 Rflag = 0;
819 break;
820
821 case 's': {
822 char *end;
823
824 snaplen = strtol(optarg, &end, 0);
825 if (optarg == end || *end != '\0'
826 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
827 error("invalid snaplen %s", optarg);
828 else if (snaplen == 0)
829 snaplen = MAXIMUM_SNAPLEN;
830 break;
831 }
832
833 case 'S':
834 ++Sflag;
835 break;
836
837 case 't':
838 ++tflag;
839 break;
840
841 case 'T':
842 if (strcasecmp(optarg, "vat") == 0)
843 packettype = PT_VAT;
844 else if (strcasecmp(optarg, "wb") == 0)
845 packettype = PT_WB;
846 else if (strcasecmp(optarg, "rpc") == 0)
847 packettype = PT_RPC;
848 else if (strcasecmp(optarg, "rtp") == 0)
849 packettype = PT_RTP;
850 else if (strcasecmp(optarg, "rtcp") == 0)
851 packettype = PT_RTCP;
852 else if (strcasecmp(optarg, "snmp") == 0)
853 packettype = PT_SNMP;
854 else if (strcasecmp(optarg, "cnfp") == 0)
855 packettype = PT_CNFP;
856 else if (strcasecmp(optarg, "tftp") == 0)
857 packettype = PT_TFTP;
858 else if (strcasecmp(optarg, "aodv") == 0)
859 packettype = PT_AODV;
860 else
861 error("unknown packet type `%s'", optarg);
862 break;
863
864 case 'u':
865 ++uflag;
866 break;
867
868 #ifdef HAVE_PCAP_DUMP_FLUSH
869 case 'U':
870 ++Uflag;
871 break;
872 #endif
873
874 case 'v':
875 ++vflag;
876 break;
877
878 case 'w':
879 WFileName = optarg;
880 break;
881
882 case 'W':
883 Wflag = atoi(optarg);
884 if (Wflag < 0)
885 error("invalid number of output files %s", optarg);
886 WflagChars = getWflagChars(Wflag);
887 break;
888
889 case 'x':
890 ++xflag;
891 ++suppress_default_print;
892 break;
893
894 case 'X':
895 ++Xflag;
896 ++suppress_default_print;
897 break;
898
899 case 'y':
900 gndo->ndo_dltname = optarg;
901 gndo->ndo_dlt =
902 pcap_datalink_name_to_val(gndo->ndo_dltname);
903 if (gndo->ndo_dlt < 0)
904 error("invalid data link type %s", gndo->ndo_dltname);
905 break;
906
907 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
908 case 'Y':
909 {
910 /* Undocumented flag */
911 #ifdef HAVE_PCAP_DEBUG
912 extern int pcap_debug;
913 pcap_debug = 1;
914 #else
915 extern int yydebug;
916 yydebug = 1;
917 #endif
918 }
919 break;
920 #endif
921 case 'z':
922 if (optarg) {
923 zflag = strdup(optarg);
924 } else {
925 usage();
926 /* NOTREACHED */
927 }
928 break;
929
930 case 'Z':
931 if (optarg) {
932 username = strdup(optarg);
933 }
934 else {
935 usage();
936 /* NOTREACHED */
937 }
938 break;
939
940 default:
941 usage();
942 /* NOTREACHED */
943 }
944
945 switch (tflag) {
946
947 case 0: /* Default */
948 case 4: /* Default + Date*/
949 thiszone = gmt2local(0);
950 break;
951
952 case 1: /* No time stamp */
953 case 2: /* Unix timeval style */
954 case 3: /* Microseconds since previous packet */
955 case 5: /* Microseconds since first packet */
956 break;
957
958 default: /* Not supported */
959 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
960 break;
961 }
962
963 #ifdef WITH_CHROOT
964 /* if run as root, prepare for chrooting */
965 if (getuid() == 0 || geteuid() == 0) {
966 /* future extensibility for cmd-line arguments */
967 if (!chroot_dir)
968 chroot_dir = WITH_CHROOT;
969 }
970 #endif
971
972 #ifdef WITH_USER
973 /* if run as root, prepare for dropping root privileges */
974 if (getuid() == 0 || geteuid() == 0) {
975 /* Run with '-Z root' to restore old behaviour */
976 if (!username)
977 username = WITH_USER;
978 }
979 #endif
980
981 if (RFileName != NULL) {
982 int dlt;
983 const char *dlt_name;
984
985 #ifndef WIN32
986 /*
987 * We don't need network access, so relinquish any set-UID
988 * or set-GID privileges we have (if any).
989 *
990 * We do *not* want set-UID privileges when opening a
991 * trace file, as that might let the user read other
992 * people's trace files (especially if we're set-UID
993 * root).
994 */
995 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
996 fprintf(stderr, "Warning: setgid/setuid failed !\n");
997 #endif /* WIN32 */
998 pd = pcap_open_offline(RFileName, ebuf);
999 if (pd == NULL)
1000 error("%s", ebuf);
1001 dlt = pcap_datalink(pd);
1002 dlt_name = pcap_datalink_val_to_name(dlt);
1003 if (dlt_name == NULL) {
1004 fprintf(stderr, "reading from file %s, link-type %u\n",
1005 RFileName, dlt);
1006 } else {
1007 fprintf(stderr,
1008 "reading from file %s, link-type %s (%s)\n",
1009 RFileName, dlt_name,
1010 pcap_datalink_val_to_description(dlt));
1011 }
1012 localnet = 0;
1013 netmask = 0;
1014 if (fflag != 0)
1015 error("-f and -r options are incompatible");
1016 } else {
1017 if (device == NULL) {
1018 device = pcap_lookupdev(ebuf);
1019 if (device == NULL)
1020 error("%s", ebuf);
1021 }
1022 #ifdef WIN32
1023 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1024 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1025 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1026 }
1027 else
1028 {
1029 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1030 }
1031
1032 fflush(stderr);
1033 #endif /* WIN32 */
1034 #ifdef HAVE_PCAP_CREATE
1035 pd = pcap_create(device, ebuf);
1036 if (pd == NULL)
1037 error("%s", ebuf);
1038 /*
1039 * Is this an interface that supports monitor mode?
1040 */
1041 if (pcap_can_set_rfmon(pd) == 1)
1042 supports_monitor_mode = 1;
1043 else
1044 supports_monitor_mode = 0;
1045 status = pcap_set_snaplen(pd, snaplen);
1046 if (status != 0)
1047 error("%s: pcap_set_snaplen failed: %s",
1048 device, pcap_statustostr(status));
1049 status = pcap_set_promisc(pd, !pflag);
1050 if (status != 0)
1051 error("%s: pcap_set_promisc failed: %s",
1052 device, pcap_statustostr(status));
1053 if (Iflag) {
1054 status = pcap_set_rfmon(pd, 1);
1055 if (status != 0)
1056 error("%s: pcap_set_rfmon failed: %s",
1057 device, pcap_statustostr(status));
1058 }
1059 status = pcap_set_timeout(pd, 1000);
1060 if (status != 0)
1061 error("%s: pcap_set_timeout failed: %s",
1062 device, pcap_statustostr(status));
1063 if (Bflag != 0) {
1064 status = pcap_set_buffer_size(pd, Bflag);
1065 if (status != 0)
1066 error("%s: pcap_set_buffer_size failed: %s",
1067 device, pcap_statustostr(status));
1068 }
1069 status = pcap_activate(pd);
1070 if (status < 0) {
1071 /*
1072 * pcap_activate() failed.
1073 */
1074 cp = pcap_geterr(pd);
1075 if (status == PCAP_ERROR)
1076 error("%s", cp);
1077 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1078 status == PCAP_ERROR_PERM_DENIED) &&
1079 *cp != '\0')
1080 error("%s: %s\n(%s)", device,
1081 pcap_statustostr(status), cp);
1082 else
1083 error("%s: %s", device,
1084 pcap_statustostr(status));
1085 } else if (status > 0) {
1086 /*
1087 * pcap_activate() succeeded, but it's warning us
1088 * of a problem it had.
1089 */
1090 cp = pcap_geterr(pd);
1091 if (status == PCAP_WARNING)
1092 warning("%s", cp);
1093 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1094 *cp != '\0')
1095 warning("%s: %s\n(%s)", device,
1096 pcap_statustostr(status), cp);
1097 else
1098 warning("%s: %s", device,
1099 pcap_statustostr(status));
1100 }
1101 #else
1102 *ebuf = '\0';
1103 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1104 if (pd == NULL)
1105 error("%s", ebuf);
1106 else if (*ebuf)
1107 warning("%s", ebuf);
1108 #endif /* HAVE_PCAP_CREATE */
1109 /*
1110 * Let user own process after socket has been opened.
1111 */
1112 #ifndef WIN32
1113 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1114 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1115 #endif /* WIN32 */
1116 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1117 if(Bflag != 0)
1118 if(pcap_setbuff(pd, Bflag)==-1){
1119 error("%s", pcap_geterr(pd));
1120 }
1121 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1122 if (Lflag)
1123 show_dlts_and_exit(device, pd);
1124 if (gndo->ndo_dlt >= 0) {
1125 #ifdef HAVE_PCAP_SET_DATALINK
1126 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1127 error("%s", pcap_geterr(pd));
1128 #else
1129 /*
1130 * We don't actually support changing the
1131 * data link type, so we only let them
1132 * set it to what it already is.
1133 */
1134 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1135 error("%s is not one of the DLTs supported by this device\n",
1136 gndo->ndo_dltname);
1137 }
1138 #endif
1139 (void)fprintf(stderr, "%s: data link type %s\n",
1140 program_name, gndo->ndo_dltname);
1141 (void)fflush(stderr);
1142 }
1143 i = pcap_snapshot(pd);
1144 if (snaplen < i) {
1145 warning("snaplen raised from %d to %d", snaplen, i);
1146 snaplen = i;
1147 }
1148 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1149 localnet = 0;
1150 netmask = 0;
1151 warning("%s", ebuf);
1152 }
1153 }
1154 if (infile)
1155 cmdbuf = read_infile(infile);
1156 else
1157 cmdbuf = copy_argv(&argv[optind]);
1158
1159 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1160 error("%s", pcap_geterr(pd));
1161 free(cmdbuf);
1162 if (dflag) {
1163 bpf_dump(&fcode, dflag);
1164 pcap_close(pd);
1165 exit(0);
1166 }
1167 init_addrtoname(localnet, netmask);
1168 init_checksum();
1169
1170 #ifndef WIN32
1171 (void)setsignal(SIGPIPE, cleanup);
1172 (void)setsignal(SIGTERM, cleanup);
1173 (void)setsignal(SIGINT, cleanup);
1174 (void)setsignal(SIGCHLD, child_cleanup);
1175 #endif /* WIN32 */
1176 /* Cooperate with nohup(1) */
1177 #ifndef WIN32
1178 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1179 (void)setsignal(SIGHUP, oldhandler);
1180 #endif /* WIN32 */
1181
1182 if (pcap_setfilter(pd, &fcode) < 0)
1183 error("%s", pcap_geterr(pd));
1184 if (WFileName) {
1185 pcap_dumper_t *p;
1186 /* Do not exceed the default NAME_MAX for files. */
1187 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1188
1189 if (dumpinfo.CurrentFileName == NULL)
1190 error("malloc of dumpinfo.CurrentFileName");
1191
1192 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1193 if (Cflag != 0)
1194 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1195 else
1196 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1197
1198 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1199 if (p == NULL)
1200 error("%s", pcap_geterr(pd));
1201 if (Cflag != 0 || Gflag != 0) {
1202 callback = dump_packet_and_trunc;
1203 dumpinfo.WFileName = WFileName;
1204 dumpinfo.pd = pd;
1205 dumpinfo.p = p;
1206 pcap_userdata = (u_char *)&dumpinfo;
1207 } else {
1208 callback = dump_packet;
1209 pcap_userdata = (u_char *)p;
1210 }
1211 } else {
1212 type = pcap_datalink(pd);
1213 printinfo.ndo_type = 1;
1214 printinfo.ndo = gndo;
1215 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1216 if (printinfo.p.ndo_printer == NULL) {
1217 printinfo.p.printer = lookup_printer(type);
1218 printinfo.ndo_type = 0;
1219 if (printinfo.p.printer == NULL) {
1220 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1221 if (gndo->ndo_dltname != NULL)
1222 error("packet printing is not supported for link type %s: use -w",
1223 gndo->ndo_dltname);
1224 else
1225 error("packet printing is not supported for link type %d: use -w", type);
1226 }
1227 }
1228 callback = print_packet;
1229 pcap_userdata = (u_char *)&printinfo;
1230 }
1231 #ifndef WIN32
1232 /*
1233 * We cannot do this earlier, because we want to be able to open
1234 * the file (if done) for writing before giving up permissions.
1235 */
1236 if (getuid() == 0 || geteuid() == 0) {
1237 if (username || chroot_dir)
1238 droproot(username, chroot_dir);
1239 }
1240 #endif /* WIN32 */
1241 #ifdef SIGINFO
1242 /*
1243 * We can't get statistics when reading from a file rather
1244 * than capturing from a device.
1245 */
1246 if (RFileName == NULL)
1247 (void)setsignal(SIGINFO, requestinfo);
1248 #endif
1249
1250 if (vflag > 0 && WFileName) {
1251 /*
1252 * When capturing to a file, "-v" means tcpdump should,
1253 * every 10 secodns, "v"erbosely report the number of
1254 * packets captured.
1255 */
1256 #ifdef USE_WIN32_MM_TIMER
1257 /* call verbose_stats_dump() each 1000 +/-100msec */
1258 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1259 setvbuf(stderr, NULL, _IONBF, 0);
1260 #elif defined(HAVE_ALARM)
1261 (void)setsignal(SIGALRM, verbose_stats_dump);
1262 alarm(1);
1263 #endif
1264 }
1265
1266 #ifndef WIN32
1267 if (RFileName == NULL) {
1268 int dlt;
1269 const char *dlt_name;
1270
1271 if (!vflag && !WFileName) {
1272 (void)fprintf(stderr,
1273 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1274 program_name);
1275 } else
1276 (void)fprintf(stderr, "%s: ", program_name);
1277 dlt = pcap_datalink(pd);
1278 dlt_name = pcap_datalink_val_to_name(dlt);
1279 if (dlt_name == NULL) {
1280 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1281 device, dlt, snaplen);
1282 } else {
1283 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1284 device, dlt_name,
1285 pcap_datalink_val_to_description(dlt), snaplen);
1286 }
1287 (void)fflush(stderr);
1288 }
1289 #endif /* WIN32 */
1290 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1291 if (WFileName == NULL) {
1292 /*
1293 * We're printing packets. Flush the printed output,
1294 * so it doesn't get intermingled with error output.
1295 */
1296 if (status == -2) {
1297 /*
1298 * We got interrupted, so perhaps we didn't
1299 * manage to finish a line we were printing.
1300 * Print an extra newline, just in case.
1301 */
1302 putchar('\n');
1303 }
1304 (void)fflush(stdout);
1305 }
1306 if (status == -1) {
1307 /*
1308 * Error. Report it.
1309 */
1310 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1311 program_name, pcap_geterr(pd));
1312 }
1313 if (RFileName == NULL) {
1314 /*
1315 * We're doing a live capture. Report the capture
1316 * statistics.
1317 */
1318 info(1);
1319 }
1320 pcap_close(pd);
1321 exit(status == -1 ? 1 : 0);
1322 }
1323
1324 /* make a clean exit on interrupts */
1325 static RETSIGTYPE
1326 cleanup(int signo _U_)
1327 {
1328 #ifdef USE_WIN32_MM_TIMER
1329 if (timer_id)
1330 timeKillEvent(timer_id);
1331 timer_id = 0;
1332 #elif defined(HAVE_ALARM)
1333 alarm(0);
1334 #endif
1335
1336 #ifdef HAVE_PCAP_BREAKLOOP
1337 /*
1338 * We have "pcap_breakloop()"; use it, so that we do as little
1339 * as possible in the signal handler (it's probably not safe
1340 * to do anything with standard I/O streams in a signal handler -
1341 * the ANSI C standard doesn't say it is).
1342 */
1343 pcap_breakloop(pd);
1344 #else
1345 /*
1346 * We don't have "pcap_breakloop()"; this isn't safe, but
1347 * it's the best we can do. Print the summary if we're
1348 * not reading from a savefile - i.e., if we're doing a
1349 * live capture - and exit.
1350 */
1351 if (pd != NULL && pcap_file(pd) == NULL) {
1352 /*
1353 * We got interrupted, so perhaps we didn't
1354 * manage to finish a line we were printing.
1355 * Print an extra newline, just in case.
1356 */
1357 putchar('\n');
1358 (void)fflush(stdout);
1359 info(1);
1360 }
1361 exit(0);
1362 #endif
1363 }
1364
1365 /*
1366 On windows, we do not use a fork, so we do not care less about
1367 waiting a child processes to die
1368 */
1369 #ifndef WIN32
1370 static RETSIGTYPE
1371 child_cleanup(int signo _U_)
1372 {
1373 wait(NULL);
1374 }
1375 #endif /* WIN32 */
1376
1377 static void
1378 info(register int verbose)
1379 {
1380 struct pcap_stat stat;
1381
1382 /*
1383 * Older versions of libpcap didn't set ps_ifdrop on some
1384 * platforms; initialize it to 0 to handle that.
1385 */
1386 stat.ps_ifdrop = 0;
1387 if (pcap_stats(pd, &stat) < 0) {
1388 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1389 infoprint = 0;
1390 return;
1391 }
1392
1393 if (!verbose)
1394 fprintf(stderr, "%s: ", program_name);
1395
1396 (void)fprintf(stderr, "%u packets captured", packets_captured);
1397 if (!verbose)
1398 fputs(", ", stderr);
1399 else
1400 putc('\n', stderr);
1401 (void)fprintf(stderr, "%u packets received by filter", stat.ps_recv);
1402 if (!verbose)
1403 fputs(", ", stderr);
1404 else
1405 putc('\n', stderr);
1406 (void)fprintf(stderr, "%u packets dropped by kernel", stat.ps_drop);
1407 if (stat.ps_ifdrop != 0) {
1408 if (!verbose)
1409 fputs(", ", stderr);
1410 else
1411 putc('\n', stderr);
1412 (void)fprintf(stderr, "%u packets dropped by interface\n",
1413 stat.ps_ifdrop);
1414 } else
1415 putc('\n', stderr);
1416 infoprint = 0;
1417 }
1418
1419 #ifndef WIN32
1420 static void
1421 compress_savefile(const char *filename)
1422 {
1423 if (fork())
1424 return;
1425 /*
1426 * Set to lowest priority so that this doesn't disturb the capture
1427 */
1428 #ifdef NZERO
1429 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1430 #else
1431 setpriority(PRIO_PROCESS, 0, 19);
1432 #endif
1433 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1434 fprintf(stderr,
1435 "compress_savefile:execlp(%s, %s): %s\n",
1436 zflag,
1437 filename,
1438 strerror(errno));
1439 }
1440 #else /* WIN32 */
1441 static void
1442 compress_savefile(const char *filename)
1443 {
1444 fprintf(stderr,
1445 "compress_savefile failed. Functionality not implemented under windows\n");
1446 }
1447 #endif /* WIN32 */
1448
1449 static void
1450 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1451 {
1452 struct dump_info *dump_info;
1453
1454 ++packets_captured;
1455
1456 ++infodelay;
1457
1458 dump_info = (struct dump_info *)user;
1459
1460 /*
1461 * XXX - this won't force the file to rotate on the specified time
1462 * boundary, but it will rotate on the first packet received after the
1463 * specified Gflag number of seconds. Note: if a Gflag time boundary
1464 * and a Cflag size boundary coincide, the time rotation will occur
1465 * first thereby cancelling the Cflag boundary (since the file should
1466 * be 0).
1467 */
1468 if (Gflag != 0) {
1469 /* Check if it is time to rotate */
1470 time_t t;
1471
1472 /* Get the current time */
1473 if ((t = time(NULL)) == (time_t)-1) {
1474 error("dump_and_trunc_packet: can't get current_time: %s",
1475 pcap_strerror(errno));
1476 }
1477
1478
1479 /* If the time is greater than the specified window, rotate */
1480 if (t - Gflag_time >= Gflag) {
1481 /* Update the Gflag_time */
1482 Gflag_time = t;
1483 /* Update Gflag_count */
1484 Gflag_count++;
1485 /*
1486 * Close the current file and open a new one.
1487 */
1488 pcap_dump_close(dump_info->p);
1489
1490 /*
1491 * Compress the file we just closed, if the user asked for it
1492 */
1493 if (zflag != NULL)
1494 compress_savefile(dump_info->CurrentFileName);
1495
1496 /*
1497 * Check to see if we've exceeded the Wflag (when
1498 * not using Cflag).
1499 */
1500 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1501 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1502 Wflag);
1503 exit(0);
1504 /* NOTREACHED */
1505 }
1506 if (dump_info->CurrentFileName != NULL)
1507 free(dump_info->CurrentFileName);
1508 /* Allocate space for max filename + \0. */
1509 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1510 if (dump_info->CurrentFileName == NULL)
1511 error("dump_packet_and_trunc: malloc");
1512 /*
1513 * This is always the first file in the Cflag
1514 * rotation: e.g. 0
1515 * We also don't need numbering if Cflag is not set.
1516 */
1517 if (Cflag != 0)
1518 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1519 WflagChars);
1520 else
1521 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1522
1523 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1524 if (dump_info->p == NULL)
1525 error("%s", pcap_geterr(pd));
1526 }
1527 }
1528
1529 /*
1530 * XXX - this won't prevent capture files from getting
1531 * larger than Cflag - the last packet written to the
1532 * file could put it over Cflag.
1533 */
1534 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1535 /*
1536 * Close the current file and open a new one.
1537 */
1538 pcap_dump_close(dump_info->p);
1539
1540 /*
1541 * Compress the file we just closed, if the user asked for it
1542 */
1543 if (zflag != NULL)
1544 compress_savefile(dump_info->CurrentFileName);
1545
1546 Cflag_count++;
1547 if (Wflag > 0) {
1548 if (Cflag_count >= Wflag)
1549 Cflag_count = 0;
1550 }
1551 if (dump_info->CurrentFileName != NULL)
1552 free(dump_info->CurrentFileName);
1553 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1554 if (dump_info->CurrentFileName == NULL)
1555 error("dump_packet_and_trunc: malloc");
1556 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1557 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1558 if (dump_info->p == NULL)
1559 error("%s", pcap_geterr(pd));
1560 }
1561
1562 pcap_dump((u_char *)dump_info->p, h, sp);
1563 #ifdef HAVE_PCAP_DUMP_FLUSH
1564 if (Uflag)
1565 pcap_dump_flush(dump_info->p);
1566 #endif
1567
1568 --infodelay;
1569 if (infoprint)
1570 info(0);
1571 }
1572
1573 static void
1574 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1575 {
1576 ++packets_captured;
1577
1578 ++infodelay;
1579
1580 pcap_dump(user, h, sp);
1581 #ifdef HAVE_PCAP_DUMP_FLUSH
1582 if (Uflag)
1583 pcap_dump_flush((pcap_dumper_t *)user);
1584 #endif
1585
1586 --infodelay;
1587 if (infoprint)
1588 info(0);
1589 }
1590
1591 static void
1592 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1593 {
1594 struct print_info *print_info;
1595 u_int hdrlen;
1596
1597 ++packets_captured;
1598
1599 ++infodelay;
1600 ts_print(&h->ts);
1601
1602 print_info = (struct print_info *)user;
1603
1604 /*
1605 * Some printers want to check that they're not walking off the
1606 * end of the packet.
1607 * Rather than pass it all the way down, we set this global.
1608 */
1609 snapend = sp + h->caplen;
1610
1611 if(print_info->ndo_type) {
1612 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1613 } else {
1614 hdrlen = (*print_info->p.printer)(h, sp);
1615 }
1616
1617 if (Xflag) {
1618 /*
1619 * Print the raw packet data in hex and ASCII.
1620 */
1621 if (Xflag > 1) {
1622 /*
1623 * Include the link-layer header.
1624 */
1625 hex_and_ascii_print("\n\t", sp, h->caplen);
1626 } else {
1627 /*
1628 * Don't include the link-layer header - and if
1629 * we have nothing past the link-layer header,
1630 * print nothing.
1631 */
1632 if (h->caplen > hdrlen)
1633 hex_and_ascii_print("\n\t", sp + hdrlen,
1634 h->caplen - hdrlen);
1635 }
1636 } else if (xflag) {
1637 /*
1638 * Print the raw packet data in hex.
1639 */
1640 if (xflag > 1) {
1641 /*
1642 * Include the link-layer header.
1643 */
1644 hex_print("\n\t", sp, h->caplen);
1645 } else {
1646 /*
1647 * Don't include the link-layer header - and if
1648 * we have nothing past the link-layer header,
1649 * print nothing.
1650 */
1651 if (h->caplen > hdrlen)
1652 hex_print("\n\t", sp + hdrlen,
1653 h->caplen - hdrlen);
1654 }
1655 } else if (Aflag) {
1656 /*
1657 * Print the raw packet data in ASCII.
1658 */
1659 if (Aflag > 1) {
1660 /*
1661 * Include the link-layer header.
1662 */
1663 ascii_print(sp, h->caplen);
1664 } else {
1665 /*
1666 * Don't include the link-layer header - and if
1667 * we have nothing past the link-layer header,
1668 * print nothing.
1669 */
1670 if (h->caplen > hdrlen)
1671 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1672 }
1673 }
1674
1675 putchar('\n');
1676
1677 --infodelay;
1678 if (infoprint)
1679 info(0);
1680 }
1681
1682 #ifdef WIN32
1683 /*
1684 * XXX - there should really be libpcap calls to get the version
1685 * number as a string (the string would be generated from #defines
1686 * at run time, so that it's not generated from string constants
1687 * in the library, as, on many UNIX systems, those constants would
1688 * be statically linked into the application executable image, and
1689 * would thus reflect the version of libpcap on the system on
1690 * which the application was *linked*, not the system on which it's
1691 * *running*.
1692 *
1693 * That routine should be documented, unlike the "version[]"
1694 * string, so that UNIX vendors providing their own libpcaps
1695 * don't omit it (as a couple of vendors have...).
1696 *
1697 * Packet.dll should perhaps also export a routine to return the
1698 * version number of the Packet.dll code, to supply the
1699 * "Wpcap_version" information on Windows.
1700 */
1701 char WDversion[]="current-cvs.tcpdump.org";
1702 #if !defined(HAVE_GENERATED_VERSION)
1703 char version[]="current-cvs.tcpdump.org";
1704 #endif
1705 char pcap_version[]="current-cvs.tcpdump.org";
1706 char Wpcap_version[]="3.1";
1707 #endif
1708
1709 /*
1710 * By default, print the specified data out in hex and ASCII.
1711 */
1712 static void
1713 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1714 {
1715 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1716 }
1717
1718 void
1719 default_print(const u_char *bp, u_int length)
1720 {
1721 ndo_default_print(gndo, bp, length);
1722 }
1723
1724 #ifdef SIGINFO
1725 RETSIGTYPE requestinfo(int signo _U_)
1726 {
1727 if (infodelay)
1728 ++infoprint;
1729 else
1730 info(0);
1731 }
1732 #endif
1733
1734 /*
1735 * Called once each second in verbose mode while dumping to file
1736 */
1737 #ifdef USE_WIN32_MM_TIMER
1738 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1739 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1740 {
1741 struct pcap_stat stat;
1742
1743 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1744 fprintf(stderr, "Got %u\r", packets_captured);
1745 }
1746 #elif defined(HAVE_ALARM)
1747 static void verbose_stats_dump(int sig _U_)
1748 {
1749 struct pcap_stat stat;
1750
1751 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1752 fprintf(stderr, "Got %u\r", packets_captured);
1753 alarm(1);
1754 }
1755 #endif
1756
1757 static void
1758 usage(void)
1759 {
1760 extern char version[];
1761 #ifndef HAVE_PCAP_LIB_VERSION
1762 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1763 extern char pcap_version[];
1764 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1765 static char pcap_version[] = "unknown";
1766 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1767 #endif /* HAVE_PCAP_LIB_VERSION */
1768
1769 #ifdef HAVE_PCAP_LIB_VERSION
1770 #ifdef WIN32
1771 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1772 #else /* WIN32 */
1773 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1774 #endif /* WIN32 */
1775 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1776 #else /* HAVE_PCAP_LIB_VERSION */
1777 #ifdef WIN32
1778 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1779 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1780 #else /* WIN32 */
1781 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1782 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1783 #endif /* WIN32 */
1784 #endif /* HAVE_PCAP_LIB_VERSION */
1785 (void)fprintf(stderr,
1786 "Usage: %s [-aAbd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1787 (void)fprintf(stderr,
1788 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1789 (void)fprintf(stderr,
1790 "\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
1791 (void)fprintf(stderr,
1792 "\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
1793 (void)fprintf(stderr,
1794 "\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
1795 (void)fprintf(stderr,
1796 "\t\t[ expression ]\n");
1797 exit(1);
1798 }
1799
1800
1801
1802 /* VARARGS */
1803 static void
1804 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1805 {
1806 va_list ap;
1807
1808 (void)fprintf(stderr, "%s: ", program_name);
1809 va_start(ap, fmt);
1810 (void)vfprintf(stderr, fmt, ap);
1811 va_end(ap);
1812 if (*fmt) {
1813 fmt += strlen(fmt);
1814 if (fmt[-1] != '\n')
1815 (void)fputc('\n', stderr);
1816 }
1817 exit(1);
1818 /* NOTREACHED */
1819 }
1820
1821 /* VARARGS */
1822 static void
1823 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1824 {
1825 va_list ap;
1826
1827 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1828 va_start(ap, fmt);
1829 (void)vfprintf(stderr, fmt, ap);
1830 va_end(ap);
1831 if (*fmt) {
1832 fmt += strlen(fmt);
1833 if (fmt[-1] != '\n')
1834 (void)fputc('\n', stderr);
1835 }
1836 }
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