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- Committer: Bazaar Package Importer
- Author(s): Romain Francoise
- Date: 2008-03-08 19:24:02 UTC
- mfrom: (6.1.3 hardy)
- Revision ID: james.westby@ubuntu.com-20080308192402-9n7erk2yyyd5mpt3
Tags: 3.9.8-4
debian/control: Build-Depend on libpcap0.8-dev (>= 0.9.3),
not (>= 0.9.3-1).
not (>= 0.9.3-1).
- files added:
- .#CHANGES.1.87
- autom4te.cache
- tcpdump-3.9
- files removed:
- debian/patches/00list
- files modified:
- CHANGES
added
removed
.#tcpdump.c.1.253.2.5
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 1.253.2.5 2005/05/23 06:28:56 hannes 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
#ifndef WIN32
69
#include <pwd.h>
70
#include <grp.h>
71
#include <errno.h>
72
#endif /* WIN32 */
73
74
#include "netdissect.h"
75
#include "interface.h"
76
#include "addrtoname.h"
77
#include "machdep.h"
78
#include "setsignal.h"
79
#include "gmt2local.h"
80
#include "pcap-missing.h"
81
82
netdissect_options Gndo;
83
netdissect_options *gndo = &Gndo;
84
85
/*
86
* Define the maximum number of files for the -C flag, and how many
87
* characters can be added to a filename for the -C flag (which
88
* should be enough to handle MAX_CFLAG - 1).
89
*/
90
#define MAX_CFLAG 1000000
91
#define MAX_CFLAG_CHARS 6
92
93
int dflag; /* print filter code */
94
int Lflag; /* list available data link types and exit */
95
96
static int infodelay;
97
static int infoprint;
98
99
char *program_name;
100
101
int32_t thiszone; /* seconds offset from gmt to local time */
102
103
/* Forwards */
104
static RETSIGTYPE cleanup(int);
105
static void usage(void) __attribute__((noreturn));
106
static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
107
108
static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
109
static void ndo_default_print(netdissect_options *, const u_char *, u_int);
110
static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
111
static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
112
static void droproot(const char *, const char *);
113
static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
114
static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
115
116
#ifdef SIGINFO
117
RETSIGTYPE requestinfo(int);
118
#endif
119
120
#if defined(USE_WIN32_MM_TIMER)
121
#include <MMsystem.h>
122
static UINT timer_id;
123
static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
124
#elif defined(HAVE_ALARM)
125
static void verbose_stats_dump(int sig);
126
#endif
127
128
static void info(int);
129
static u_int packets_captured;
130
131
typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
132
133
struct printer {
134
if_printer f;
135
int type;
136
};
137
138
static struct printer printers[] = {
139
{ arcnet_if_print, DLT_ARCNET },
140
#ifdef DLT_ARCNET_LINUX
141
{ arcnet_linux_if_print, DLT_ARCNET_LINUX },
142
#endif
143
{ ether_if_print, DLT_EN10MB },
144
{ token_if_print, DLT_IEEE802 },
145
#ifdef DLT_LANE8023
146
{ lane_if_print, DLT_LANE8023 },
147
#endif
148
#ifdef DLT_CIP
149
{ cip_if_print, DLT_CIP },
150
#endif
151
#ifdef DLT_ATM_CLIP
152
{ cip_if_print, DLT_ATM_CLIP },
153
#endif
154
{ sl_if_print, DLT_SLIP },
155
#ifdef DLT_SLIP_BSDOS
156
{ sl_bsdos_if_print, DLT_SLIP_BSDOS },
157
#endif
158
{ ppp_if_print, DLT_PPP },
159
#ifdef DLT_PPP_WITHDIRECTION
160
{ ppp_if_print, DLT_PPP_WITHDIRECTION },
161
#endif
162
#ifdef DLT_PPP_BSDOS
163
{ ppp_bsdos_if_print, DLT_PPP_BSDOS },
164
#endif
165
{ fddi_if_print, DLT_FDDI },
166
{ null_if_print, DLT_NULL },
167
#ifdef DLT_LOOP
168
{ null_if_print, DLT_LOOP },
169
#endif
170
{ raw_if_print, DLT_RAW },
171
{ atm_if_print, DLT_ATM_RFC1483 },
172
#ifdef DLT_C_HDLC
173
{ chdlc_if_print, DLT_C_HDLC },
174
#endif
175
#ifdef DLT_HDLC
176
{ chdlc_if_print, DLT_HDLC },
177
#endif
178
#ifdef DLT_PPP_SERIAL
179
{ ppp_hdlc_if_print, DLT_PPP_SERIAL },
180
#endif
181
#ifdef DLT_PPP_ETHER
182
{ pppoe_if_print, DLT_PPP_ETHER },
183
#endif
184
#ifdef DLT_LINUX_SLL
185
{ sll_if_print, DLT_LINUX_SLL },
186
#endif
187
#ifdef DLT_IEEE802_11
188
{ ieee802_11_if_print, DLT_IEEE802_11},
189
#endif
190
#ifdef DLT_LTALK
191
{ ltalk_if_print, DLT_LTALK },
192
#endif
193
#ifdef DLT_PFLOG
194
{ pflog_if_print, DLT_PFLOG },
195
#endif
196
#ifdef DLT_FR
197
{ fr_if_print, DLT_FR },
198
#endif
199
#ifdef DLT_FRELAY
200
{ fr_if_print, DLT_FRELAY },
201
#endif
202
#ifdef DLT_SUNATM
203
{ sunatm_if_print, DLT_SUNATM },
204
#endif
205
#ifdef DLT_IP_OVER_FC
206
{ ipfc_if_print, DLT_IP_OVER_FC },
207
#endif
208
#ifdef DLT_PRISM_HEADER
209
{ prism_if_print, DLT_PRISM_HEADER },
210
#endif
211
#ifdef DLT_IEEE802_11_RADIO
212
{ ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
213
#endif
214
#ifdef DLT_ENC
215
{ enc_if_print, DLT_ENC },
216
#endif
217
#ifdef DLT_SYMANTEC_FIREWALL
218
{ symantec_if_print, DLT_SYMANTEC_FIREWALL },
219
#endif
220
#ifdef DLT_APPLE_IP_OVER_IEEE1394
221
{ ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
222
#endif
223
#ifdef DLT_JUNIPER_ATM1
224
{ juniper_atm1_print, DLT_JUNIPER_ATM1 },
225
#endif
226
#ifdef DLT_JUNIPER_ATM2
227
{ juniper_atm2_print, DLT_JUNIPER_ATM2 },
228
#endif
229
#ifdef DLT_JUNIPER_MFR
230
{ juniper_mfr_print, DLT_JUNIPER_MFR },
231
#endif
232
#ifdef DLT_JUNIPER_MLFR
233
{ juniper_mlfr_print, DLT_JUNIPER_MLFR },
234
#endif
235
#ifdef DLT_JUNIPER_MLPPP
236
{ juniper_mlppp_print, DLT_JUNIPER_MLPPP },
237
#endif
238
#ifdef DLT_JUNIPER_PPPOE
239
{ juniper_pppoe_print, DLT_JUNIPER_PPPOE },
240
#endif
241
#ifdef DLT_JUNIPER_PPPOE_ATM
242
{ juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
243
#endif
244
#ifdef DLT_JUNIPER_GGSN
245
{ juniper_ggsn_print, DLT_JUNIPER_GGSN },
246
#endif
247
#ifdef DLT_JUNIPER_ES
248
{ juniper_es_print, DLT_JUNIPER_ES },
249
#endif
250
#ifdef DLT_JUNIPER_MONITOR
251
{ juniper_monitor_print, DLT_JUNIPER_MONITOR },
252
#endif
253
#ifdef DLT_JUNIPER_SERVICES
254
{ juniper_services_print, DLT_JUNIPER_SERVICES },
255
#endif
256
{ NULL, 0 },
257
};
258
259
static if_printer
260
lookup_printer(int type)
261
{
262
struct printer *p;
263
264
for (p = printers; p->f; ++p)
265
if (type == p->type)
266
return p->f;
267
268
return NULL;
269
/* NOTREACHED */
270
}
271
272
static pcap_t *pd;
273
274
extern int optind;
275
extern int opterr;
276
extern char *optarg;
277
278
struct print_info {
279
if_printer printer;
280
};
281
282
struct dump_info {
283
char *WFileName;
284
pcap_t *pd;
285
pcap_dumper_t *p;
286
};
287
288
static void
289
show_dlts_and_exit(pcap_t *pd)
290
{
291
int n_dlts;
292
int *dlts = 0;
293
const char *dlt_name;
294
295
n_dlts = pcap_list_datalinks(pd, &dlts);
296
if (n_dlts < 0)
297
error("%s", pcap_geterr(pd));
298
else if (n_dlts == 0 || !dlts)
299
error("No data link types.");
300
301
(void) fprintf(stderr, "Data link types (use option -y to set):\n");
302
303
while (--n_dlts >= 0) {
304
dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
305
if (dlt_name != NULL) {
306
(void) fprintf(stderr, " %s (%s)", dlt_name,
307
pcap_datalink_val_to_description(dlts[n_dlts]));
308
309
/*
310
* OK, does tcpdump handle that type?
311
*/
312
if (lookup_printer(dlts[n_dlts]) == NULL)
313
(void) fprintf(stderr, " (not supported)");
314
putchar('\n');
315
} else {
316
(void) fprintf(stderr, " DLT %d (not supported)\n",
317
dlts[n_dlts]);
318
}
319
}
320
free(dlts);
321
exit(0);
322
}
323
324
/*
325
* Set up flags that might or might not be supported depending on the
326
* version of libpcap we're using.
327
*/
328
#ifdef WIN32
329
#define B_FLAG "B:"
330
#define B_FLAG_USAGE " [ -B size ]"
331
#else /* WIN32 */
332
#define B_FLAG
333
#define B_FLAG_USAGE
334
#endif /* WIN32 */
335
336
#ifdef HAVE_PCAP_FINDALLDEVS
337
#ifndef HAVE_PCAP_IF_T
338
#undef HAVE_PCAP_FINDALLDEVS
339
#endif
340
#endif
341
342
#ifdef HAVE_PCAP_FINDALLDEVS
343
#define D_FLAG "D"
344
#else
345
#define D_FLAG
346
#endif
347
348
#ifdef HAVE_PCAP_DUMP_FLUSH
349
#define U_FLAG "U"
350
#else
351
#define U_FLAG
352
#endif
353
354
#ifndef WIN32
355
/* Drop root privileges and chroot if necessary */
356
static void
357
droproot(const char *username, const char *chroot_dir)
358
{
359
struct passwd *pw = NULL;
360
361
if (chroot_dir && !username) {
362
fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
363
exit(1);
364
}
365
366
pw = getpwnam(username);
367
if (pw) {
368
if (chroot_dir) {
369
if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
370
fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
371
chroot_dir, pcap_strerror(errno));
372
exit(1);
373
}
374
}
375
if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
376
setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
377
fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
378
username,
379
(unsigned long)pw->pw_uid,
380
(unsigned long)pw->pw_gid,
381
pcap_strerror(errno));
382
exit(1);
383
}
384
}
385
else {
386
fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
387
username);
388
exit(1);
389
}
390
}
391
#endif /* WIN32 */
392
393
static int
394
getWflagChars(int x)
395
{
396
int c = 0;
397
398
x -= 1;
399
while (x > 0) {
400
c += 1;
401
x /= 10;
402
}
403
404
return c;
405
}
406
407
408
static void
409
MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
410
{
411
if (cnt == 0 && max_chars == 0)
412
strcpy(buffer, orig_name);
413
else
414
sprintf(buffer, "%s%0*d", orig_name, max_chars, cnt);
415
}
416
417
static int tcpdump_printf(netdissect_options *ndo _U_,
418
const char *fmt, ...)
419
{
420
421
va_list args;
422
int ret;
423
424
va_start(args, fmt);
425
ret=vfprintf(stdout, fmt, args);
426
va_end(args);
427
428
return ret;
429
}
430
431
int
432
main(int argc, char **argv)
433
{
434
register int cnt, op, i;
435
bpf_u_int32 localnet, netmask;
436
register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName, *WFileNameAlt;
437
pcap_handler callback;
438
int type;
439
struct bpf_program fcode;
440
#ifndef WIN32
441
RETSIGTYPE (*oldhandler)(int);
442
#endif
443
struct print_info printinfo;
444
struct dump_info dumpinfo;
445
u_char *pcap_userdata;
446
char ebuf[PCAP_ERRBUF_SIZE];
447
char *username = NULL;
448
char *chroot_dir = NULL;
449
#ifdef HAVE_PCAP_FINDALLDEVS
450
pcap_if_t *devpointer;
451
int devnum;
452
#endif
453
int status;
454
#ifdef WIN32
455
u_int UserBufferSize = 1000000;
456
if(wsockinit() != 0) return 1;
457
#endif /* WIN32 */
458
459
gndo->ndo_Oflag=1;
460
gndo->ndo_Rflag=1;
461
gndo->ndo_dlt=-1;
462
gndo->ndo_default_print=ndo_default_print;
463
gndo->ndo_printf=tcpdump_printf;
464
gndo->ndo_error=ndo_error;
465
gndo->ndo_warning=ndo_warning;
466
gndo->ndo_snaplen = DEFAULT_SNAPLEN;
467
468
cnt = -1;
469
device = NULL;
470
infile = NULL;
471
RFileName = NULL;
472
WFileName = NULL;
473
if ((cp = strrchr(argv[0], '/')) != NULL)
474
program_name = cp + 1;
475
else
476
program_name = argv[0];
477
478
if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
479
error("%s", ebuf);
480
481
#ifdef LIBSMI
482
smiInit("tcpdump");
483
#endif
484
485
opterr = 0;
486
while (
487
(op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:i:lLm:M:nNOpP:qr:Rs:StT:u" U_FLAG "vw:W:xXy:YZ:")) != -1)
488
switch (op) {
489
490
case 'a':
491
/* compatibility for old -a */
492
break;
493
494
case 'A':
495
++xflag;
496
++Xflag;
497
++Aflag;
498
break;
499
500
#ifdef WIN32
501
case 'B':
502
UserBufferSize = atoi(optarg)*1024;
503
if (UserBufferSize < 0)
504
error("invalid packet buffer size %s", optarg);
505
break;
506
#endif /* WIN32 */
507
508
case 'c':
509
cnt = atoi(optarg);
510
if (cnt <= 0)
511
error("invalid packet count %s", optarg);
512
break;
513
514
case 'C':
515
Cflag = atoi(optarg) * 1000000;
516
if (Cflag < 0)
517
error("invalid file size %s", optarg);
518
break;
519
520
case 'd':
521
++dflag;
522
break;
523
524
#ifdef HAVE_PCAP_FINDALLDEVS
525
case 'D':
526
if (pcap_findalldevs(&devpointer, ebuf) < 0)
527
error("%s", ebuf);
528
else {
529
for (i = 0; devpointer != 0; i++) {
530
printf("%d.%s", i+1, devpointer->name);
531
if (devpointer->description != NULL)
532
printf(" (%s)", devpointer->description);
533
printf("\n");
534
devpointer = devpointer->next;
535
}
536
}
537
return 0;
538
#endif /* HAVE_PCAP_FINDALLDEVS */
539
540
case 'L':
541
Lflag++;
542
break;
543
544
case 'e':
545
++eflag;
546
break;
547
548
case 'E':
549
#ifndef HAVE_LIBCRYPTO
550
warning("crypto code not compiled in");
551
#endif
552
gndo->ndo_espsecret = optarg;
553
break;
554
555
case 'f':
556
++fflag;
557
break;
558
559
case 'F':
560
infile = optarg;
561
break;
562
563
case 'i':
564
if (optarg[0] == '0' && optarg[1] == 0)
565
error("Invalid adapter index");
566
567
#ifdef HAVE_PCAP_FINDALLDEVS
568
/*
569
* If the argument is a number, treat it as
570
* an index into the list of adapters, as
571
* printed by "tcpdump -D".
572
*
573
* This should be OK on UNIX systems, as interfaces
574
* shouldn't have names that begin with digits.
575
* It can be useful on Windows, where more than
576
* one interface can have the same name.
577
*/
578
if ((devnum = atoi(optarg)) != 0) {
579
if (devnum < 0)
580
error("Invalid adapter index");
581
582
if (pcap_findalldevs(&devpointer, ebuf) < 0)
583
error("%s", ebuf);
584
else {
585
for (i = 0; i < devnum-1; i++){
586
devpointer = devpointer->next;
587
if (devpointer == NULL)
588
error("Invalid adapter index");
589
}
590
}
591
device = devpointer->name;
592
break;
593
}
594
#endif /* HAVE_PCAP_FINDALLDEVS */
595
device = optarg;
596
break;
597
598
case 'l':
599
#ifdef WIN32
600
/*
601
* _IOLBF is the same as _IOFBF in Microsoft's C
602
* libraries; the only alternative they offer
603
* is _IONBF.
604
*
605
* XXX - this should really be checking for MSVC++,
606
* not WIN32, if, for example, MinGW has its own
607
* C library that is more UNIX-compatible.
608
*/
609
setvbuf(stdout, NULL, _IONBF, 0);
610
#else /* WIN32 */
611
#ifdef HAVE_SETLINEBUF
612
setlinebuf(stdout);
613
#else
614
setvbuf(stdout, NULL, _IOLBF, 0);
615
#endif
616
#endif /* WIN32 */
617
break;
618
619
case 'n':
620
++nflag;
621
break;
622
623
case 'N':
624
++Nflag;
625
break;
626
627
case 'm':
628
#ifdef LIBSMI
629
if (smiLoadModule(optarg) == 0) {
630
error("could not load MIB module %s", optarg);
631
}
632
sflag = 1;
633
#else
634
(void)fprintf(stderr, "%s: ignoring option `-m %s' ",
635
program_name, optarg);
636
(void)fprintf(stderr, "(no libsmi support)\n");
637
#endif
638
break;
639
640
case 'M':
641
/* TCP-MD5 shared secret */
642
#ifndef HAVE_LIBCRYPTO
643
warning("crypto code not compiled in");
644
#endif
645
tcpmd5secret = optarg;
646
break;
647
648
case 'O':
649
Oflag = 0;
650
break;
651
652
case 'p':
653
++pflag;
654
break;
655
656
case 'q':
657
++qflag;
658
break;
659
660
case 'r':
661
RFileName = optarg;
662
break;
663
664
case 'R':
665
Rflag = 0;
666
break;
667
668
case 's': {
669
char *end;
670
671
snaplen = strtol(optarg, &end, 0);
672
if (optarg == end || *end != '\0'
673
|| snaplen < 0 || snaplen > 65535)
674
error("invalid snaplen %s", optarg);
675
else if (snaplen == 0)
676
snaplen = 65535;
677
break;
678
}
679
680
case 'S':
681
++Sflag;
682
break;
683
684
case 't':
685
++tflag;
686
break;
687
688
case 'T':
689
if (strcasecmp(optarg, "vat") == 0)
690
packettype = PT_VAT;
691
else if (strcasecmp(optarg, "wb") == 0)
692
packettype = PT_WB;
693
else if (strcasecmp(optarg, "rpc") == 0)
694
packettype = PT_RPC;
695
else if (strcasecmp(optarg, "rtp") == 0)
696
packettype = PT_RTP;
697
else if (strcasecmp(optarg, "rtcp") == 0)
698
packettype = PT_RTCP;
699
else if (strcasecmp(optarg, "snmp") == 0)
700
packettype = PT_SNMP;
701
else if (strcasecmp(optarg, "cnfp") == 0)
702
packettype = PT_CNFP;
703
else if (strcasecmp(optarg, "tftp") == 0)
704
packettype = PT_TFTP;
705
else if (strcasecmp(optarg, "aodv") == 0)
706
packettype = PT_AODV;
707
else
708
error("unknown packet type `%s'", optarg);
709
break;
710
711
case 'u':
712
++uflag;
713
break;
714
715
#ifdef HAVE_PCAP_DUMP_FLUSH
716
case 'U':
717
++Uflag;
718
break;
719
#endif
720
721
case 'v':
722
++vflag;
723
break;
724
725
case 'w':
726
WFileName = optarg;
727
break;
728
729
case 'W':
730
Wflag = atoi(optarg);
731
if (Wflag < 0)
732
error("invalid number of output files %s", optarg);
733
WflagChars = getWflagChars(Wflag);
734
break;
735
736
case 'x':
737
++xflag;
738
break;
739
740
case 'X':
741
++Xflag;
742
break;
743
744
case 'y':
745
gndo->ndo_dltname = optarg;
746
gndo->ndo_dlt =
747
pcap_datalink_name_to_val(gndo->ndo_dltname);
748
if (gndo->ndo_dlt < 0)
749
error("invalid data link type %s", gndo->ndo_dltname);
750
break;
751
752
#if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
753
case 'Y':
754
{
755
/* Undocumented flag */
756
#ifdef HAVE_PCAP_DEBUG
757
extern int pcap_debug;
758
pcap_debug = 1;
759
#else
760
extern int yydebug;
761
yydebug = 1;
762
#endif
763
}
764
break;
765
#endif
766
case 'Z':
767
if (optarg) {
768
username = strdup(optarg);
769
}
770
else {
771
usage();
772
/* NOTREACHED */
773
}
774
break;
775
776
default:
777
usage();
778
/* NOTREACHED */
779
}
780
781
switch (tflag) {
782
783
case 0: /* Default */
784
case 4: /* Default + Date*/
785
thiszone = gmt2local(0);
786
break;
787
788
case 1: /* No time stamp */
789
case 2: /* Unix timeval style */
790
case 3: /* Microseconds since previous packet */
791
break;
792
793
default: /* Not supported */
794
error("only -t, -tt, -ttt, and -tttt are supported");
795
break;
796
}
797
798
#ifdef WITH_CHROOT
799
/* if run as root, prepare for chrooting */
800
if (getuid() == 0 || geteuid() == 0) {
801
/* future extensibility for cmd-line arguments */
802
if (!chroot_dir)
803
chroot_dir = WITH_CHROOT;
804
}
805
#endif
806
807
#ifdef WITH_USER
808
/* if run as root, prepare for dropping root privileges */
809
if (getuid() == 0 || geteuid() == 0) {
810
/* Run with '-Z root' to restore old behaviour */
811
if (!username)
812
username = WITH_USER;
813
}
814
#endif
815
816
if (RFileName != NULL) {
817
int dlt;
818
const char *dlt_name;
819
820
#ifndef WIN32
821
/*
822
* We don't need network access, so relinquish any set-UID
823
* or set-GID privileges we have (if any).
824
*
825
* We do *not* want set-UID privileges when opening a
826
* trace file, as that might let the user read other
827
* people's trace files (especially if we're set-UID
828
* root).
829
*/
830
if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
831
fprintf(stderr, "Warning: setgid/setuid failed !\n");
832
#endif /* WIN32 */
833
pd = pcap_open_offline(RFileName, ebuf);
834
if (pd == NULL)
835
error("%s", ebuf);
836
dlt = pcap_datalink(pd);
837
dlt_name = pcap_datalink_val_to_name(dlt);
838
if (dlt_name == NULL) {
839
fprintf(stderr, "reading from file %s, link-type %u\n",
840
RFileName, dlt);
841
} else {
842
fprintf(stderr,
843
"reading from file %s, link-type %s (%s)\n",
844
RFileName, dlt_name,
845
pcap_datalink_val_to_description(dlt));
846
}
847
localnet = 0;
848
netmask = 0;
849
if (fflag != 0)
850
error("-f and -r options are incompatible");
851
} else {
852
if (device == NULL) {
853
device = pcap_lookupdev(ebuf);
854
if (device == NULL)
855
error("%s", ebuf);
856
}
857
#ifdef WIN32
858
if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
859
{ //a Unicode string has a \0 as second byte (so strlen() is 1)
860
fprintf(stderr, "%s: listening on %ws\n", program_name, device);
861
}
862
else
863
{
864
fprintf(stderr, "%s: listening on %s\n", program_name, device);
865
}
866
867
fflush(stderr);
868
#endif /* WIN32 */
869
*ebuf = '\0';
870
pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
871
if (pd == NULL)
872
error("%s", ebuf);
873
else if (*ebuf)
874
warning("%s", ebuf);
875
/*
876
* Let user own process after socket has been opened.
877
*/
878
#ifndef WIN32
879
if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
880
fprintf(stderr, "Warning: setgid/setuid failed !\n");
881
#endif /* WIN32 */
882
#ifdef WIN32
883
if(UserBufferSize != 1000000)
884
if(pcap_setbuff(pd, UserBufferSize)==-1){
885
error("%s", pcap_geterr(pd));
886
}
887
#endif /* WIN32 */
888
if (Lflag)
889
show_dlts_and_exit(pd);
890
if (gndo->ndo_dlt >= 0) {
891
#ifdef HAVE_PCAP_SET_DATALINK
892
if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
893
error("%s", pcap_geterr(pd));
894
#else
895
/*
896
* We don't actually support changing the
897
* data link type, so we only let them
898
* set it to what it already is.
899
*/
900
if (gndo->ndo_dlt != pcap_datalink(pd)) {
901
error("%s is not one of the DLTs supported by this device\n",
902
gndo->ndo_dltname);
903
}
904
#endif
905
(void)fprintf(stderr, "%s: data link type %s\n",
906
program_name, gndo->ndo_dltname);
907
(void)fflush(stderr);
908
}
909
i = pcap_snapshot(pd);
910
if (snaplen < i) {
911
warning("snaplen raised from %d to %d", snaplen, i);
912
snaplen = i;
913
}
914
if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
915
localnet = 0;
916
netmask = 0;
917
warning("%s", ebuf);
918
}
919
}
920
if (infile)
921
cmdbuf = read_infile(infile);
922
else
923
cmdbuf = copy_argv(&argv[optind]);
924
925
if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
926
error("%s", pcap_geterr(pd));
927
if (dflag) {
928
bpf_dump(&fcode, dflag);
929
pcap_close(pd);
930
exit(0);
931
}
932
init_addrtoname(localnet, netmask);
933
934
#ifndef WIN32
935
(void)setsignal(SIGPIPE, cleanup);
936
#endif /* WIN32 */
937
(void)setsignal(SIGTERM, cleanup);
938
(void)setsignal(SIGINT, cleanup);
939
/* Cooperate with nohup(1) */
940
#ifndef WIN32
941
if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
942
(void)setsignal(SIGHUP, oldhandler);
943
#endif /* WIN32 */
944
945
if (pcap_setfilter(pd, &fcode) < 0)
946
error("%s", pcap_geterr(pd));
947
if (WFileName) {
948
pcap_dumper_t *p;
949
950
WFileNameAlt = (char *)malloc(strlen(WFileName) + MAX_CFLAG_CHARS + 1);
951
if (WFileNameAlt == NULL)
952
error("malloc of WFileNameAlt");
953
MakeFilename(WFileNameAlt, WFileName, 0, WflagChars);
954
p = pcap_dump_open(pd, WFileNameAlt);
955
if (p == NULL)
956
error("%s", pcap_geterr(pd));
957
if (Cflag != 0) {
958
callback = dump_packet_and_trunc;
959
dumpinfo.WFileName = WFileName;
960
dumpinfo.pd = pd;
961
dumpinfo.p = p;
962
pcap_userdata = (u_char *)&dumpinfo;
963
} else {
964
callback = dump_packet;
965
pcap_userdata = (u_char *)p;
966
}
967
} else {
968
type = pcap_datalink(pd);
969
printinfo.printer = lookup_printer(type);
970
if (printinfo.printer == NULL) {
971
gndo->ndo_dltname = pcap_datalink_val_to_name(type);
972
if (gndo->ndo_dltname != NULL)
973
error("unsupported data link type %s",
974
gndo->ndo_dltname);
975
else
976
error("unsupported data link type %d", type);
977
}
978
callback = print_packet;
979
pcap_userdata = (u_char *)&printinfo;
980
}
981
#ifndef WIN32
982
/*
983
* We cannot do this earlier, because we want to be able to open
984
* the file (if done) for writing before giving up permissions.
985
*/
986
if (getuid() == 0 || geteuid() == 0) {
987
if (username || chroot_dir)
988
droproot(username, chroot_dir);
989
}
990
#endif /* WIN32 */
991
#ifdef SIGINFO
992
(void)setsignal(SIGINFO, requestinfo);
993
#endif
994
995
if (vflag > 0 && WFileName) {
996
/*
997
* When capturing to a file, "-v" means tcpdump should,
998
* every 10 secodns, "v"erbosely report the number of
999
* packets captured.
1000
*/
1001
#ifdef USE_WIN32_MM_TIMER
1002
/* call verbose_stats_dump() each 1000 +/-100msec */
1003
timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1004
setvbuf(stderr, NULL, _IONBF, 0);
1005
#elif defined(HAVE_ALARM)
1006
(void)setsignal(SIGALRM, verbose_stats_dump);
1007
alarm(1);
1008
#endif
1009
}
1010
1011
#ifndef WIN32
1012
if (RFileName == NULL) {
1013
int dlt;
1014
const char *dlt_name;
1015
1016
if (!vflag && !WFileName) {
1017
(void)fprintf(stderr,
1018
"%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1019
program_name);
1020
} else
1021
(void)fprintf(stderr, "%s: ", program_name);
1022
dlt = pcap_datalink(pd);
1023
dlt_name = pcap_datalink_val_to_name(dlt);
1024
if (dlt_name == NULL) {
1025
(void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1026
device, dlt, snaplen);
1027
} else {
1028
(void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1029
device, dlt_name,
1030
pcap_datalink_val_to_description(dlt), snaplen);
1031
}
1032
(void)fflush(stderr);
1033
}
1034
#endif /* WIN32 */
1035
status = pcap_loop(pd, cnt, callback, pcap_userdata);
1036
if (WFileName == NULL) {
1037
/*
1038
* We're printing packets. Flush the printed output,
1039
* so it doesn't get intermingled with error output.
1040
*/
1041
if (status == -2) {
1042
/*
1043
* We got interrupted, so perhaps we didn't
1044
* manage to finish a line we were printing.
1045
* Print an extra newline, just in case.
1046
*/
1047
putchar('\n');
1048
}
1049
(void)fflush(stdout);
1050
}
1051
if (status == -1) {
1052
/*
1053
* Error. Report it.
1054
*/
1055
(void)fprintf(stderr, "%s: pcap_loop: %s\n",
1056
program_name, pcap_geterr(pd));
1057
}
1058
if (RFileName == NULL) {
1059
/*
1060
* We're doing a live capture. Report the capture
1061
* statistics.
1062
*/
1063
info(1);
1064
}
1065
pcap_close(pd);
1066
exit(status == -1 ? 1 : 0);
1067
}
1068
1069
/* make a clean exit on interrupts */
1070
static RETSIGTYPE
1071
cleanup(int signo _U_)
1072
{
1073
#ifdef USE_WIN32_MM_TIMER
1074
if (timer_id)
1075
timeKillEvent(timer_id);
1076
timer_id = 0;
1077
#elif defined(HAVE_ALARM)
1078
alarm(0);
1079
#endif
1080
1081
#ifdef HAVE_PCAP_BREAKLOOP
1082
/*
1083
* We have "pcap_breakloop()"; use it, so that we do as little
1084
* as possible in the signal handler (it's probably not safe
1085
* to do anything with standard I/O streams in a signal handler -
1086
* the ANSI C standard doesn't say it is).
1087
*/
1088
pcap_breakloop(pd);
1089
#else
1090
/*
1091
* We don't have "pcap_breakloop()"; this isn't safe, but
1092
* it's the best we can do. Print the summary if we're
1093
* not reading from a savefile - i.e., if we're doing a
1094
* live capture - and exit.
1095
*/
1096
if (pd != NULL && pcap_file(pd) == NULL) {
1097
/*
1098
* We got interrupted, so perhaps we didn't
1099
* manage to finish a line we were printing.
1100
* Print an extra newline, just in case.
1101
*/
1102
putchar('\n');
1103
(void)fflush(stdout);
1104
info(1);
1105
}
1106
exit(0);
1107
#endif
1108
}
1109
1110
static void
1111
info(register int verbose)
1112
{
1113
struct pcap_stat stat;
1114
1115
if (pcap_stats(pd, &stat) < 0) {
1116
(void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1117
return;
1118
}
1119
1120
if (!verbose)
1121
fprintf(stderr, "%s: ", program_name);
1122
1123
(void)fprintf(stderr, "%u packets captured", packets_captured);
1124
if (!verbose)
1125
fputs(", ", stderr);
1126
else
1127
putc('\n', stderr);
1128
(void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1129
if (!verbose)
1130
fputs(", ", stderr);
1131
else
1132
putc('\n', stderr);
1133
(void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1134
infoprint = 0;
1135
}
1136
1137
static void
1138
dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1139
{
1140
struct dump_info *dump_info;
1141
char *name;
1142
1143
++packets_captured;
1144
1145
++infodelay;
1146
1147
dump_info = (struct dump_info *)user;
1148
1149
/*
1150
* XXX - this won't prevent capture files from getting
1151
* larger than Cflag - the last packet written to the
1152
* file could put it over Cflag.
1153
*/
1154
if (ftell((FILE *)dump_info->p) > Cflag) {
1155
/*
1156
* Close the current file and open a new one.
1157
*/
1158
pcap_dump_close(dump_info->p);
1159
Cflag_count++;
1160
if (Wflag > 0) {
1161
if (Cflag_count >= Wflag)
1162
Cflag_count = 0;
1163
} else {
1164
if (Cflag_count >= MAX_CFLAG)
1165
error("too many output files");
1166
}
1167
name = (char *)malloc(strlen(dump_info->WFileName) + MAX_CFLAG_CHARS + 1);
1168
if (name == NULL)
1169
error("dump_packet_and_trunc: malloc");
1170
MakeFilename(name, dump_info->WFileName, Cflag_count, WflagChars);
1171
dump_info->p = pcap_dump_open(dump_info->pd, name);
1172
free(name);
1173
if (dump_info->p == NULL)
1174
error("%s", pcap_geterr(pd));
1175
}
1176
1177
pcap_dump((u_char *)dump_info->p, h, sp);
1178
#ifdef HAVE_PCAP_DUMP_FLUSH
1179
if (Uflag)
1180
pcap_dump_flush(dump_info->p);
1181
#endif
1182
1183
--infodelay;
1184
if (infoprint)
1185
info(0);
1186
}
1187
1188
static void
1189
dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1190
{
1191
++packets_captured;
1192
1193
++infodelay;
1194
1195
pcap_dump(user, h, sp);
1196
#ifdef HAVE_PCAP_DUMP_FLUSH
1197
if (Uflag)
1198
pcap_dump_flush((pcap_dumper_t *)user);
1199
#endif
1200
1201
--infodelay;
1202
if (infoprint)
1203
info(0);
1204
}
1205
1206
static void
1207
print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1208
{
1209
struct print_info *print_info;
1210
u_int hdrlen;
1211
1212
++packets_captured;
1213
1214
++infodelay;
1215
ts_print(&h->ts);
1216
1217
print_info = (struct print_info *)user;
1218
1219
/*
1220
* Some printers want to check that they're not walking off the
1221
* end of the packet.
1222
* Rather than pass it all the way down, we set this global.
1223
*/
1224
snapend = sp + h->caplen;
1225
1226
hdrlen = (*print_info->printer)(h, sp);
1227
if (xflag) {
1228
/*
1229
* Print the raw packet data.
1230
*/
1231
if (xflag > 1) {
1232
/*
1233
* Include the link-layer header.
1234
*/
1235
hex_print("\n\t", sp, h->caplen);
1236
} else {
1237
/*
1238
* Don't include the link-layer header - and if
1239
* we have nothing past the link-layer header,
1240
* print nothing.
1241
*/
1242
if (h->caplen > hdrlen)
1243
hex_print("\n\t", sp + hdrlen,
1244
h->caplen - hdrlen);
1245
}
1246
} else if (Xflag) {
1247
/*
1248
* Print the raw packet data.
1249
*/
1250
if (Xflag > 1) {
1251
/*
1252
* Include the link-layer header.
1253
*/
1254
ascii_print("\n\t", sp, h->caplen);
1255
} else {
1256
/*
1257
* Don't include the link-layer header - and if
1258
* we have nothing past the link-layer header,
1259
* print nothing.
1260
*/
1261
if (h->caplen > hdrlen)
1262
ascii_print("\n\t", sp + hdrlen,
1263
h->caplen - hdrlen);
1264
}
1265
}
1266
1267
putchar('\n');
1268
1269
--infodelay;
1270
if (infoprint)
1271
info(0);
1272
}
1273
1274
#ifdef WIN32
1275
/*
1276
* XXX - there should really be libpcap calls to get the version
1277
* number as a string (the string would be generated from #defines
1278
* at run time, so that it's not generated from string constants
1279
* in the library, as, on many UNIX systems, those constants would
1280
* be statically linked into the application executable image, and
1281
* would thus reflect the version of libpcap on the system on
1282
* which the application was *linked*, not the system on which it's
1283
* *running*.
1284
*
1285
* That routine should be documented, unlike the "version[]"
1286
* string, so that UNIX vendors providing their own libpcaps
1287
* don't omit it (as a couple of vendors have...).
1288
*
1289
* Packet.dll should perhaps also export a routine to return the
1290
* version number of the Packet.dll code, to supply the
1291
* "Wpcap_version" information on Windows.
1292
*/
1293
char WDversion[]="current-cvs.tcpdump.org";
1294
#if !defined(HAVE_GENERATED_VERSION)
1295
char version[]="current-cvs.tcpdump.org";
1296
#endif
1297
char pcap_version[]="current-cvs.tcpdump.org";
1298
char Wpcap_version[]="3.1";
1299
#endif
1300
1301
/*
1302
* By default, print the specified data out in hex.
1303
*/
1304
static void
1305
ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1306
{
1307
ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1308
}
1309
1310
void
1311
default_print(const u_char *bp, u_int length)
1312
{
1313
ndo_default_print(gndo, bp, length);
1314
}
1315
1316
#ifdef SIGINFO
1317
RETSIGTYPE requestinfo(int signo _U_)
1318
{
1319
if (infodelay)
1320
++infoprint;
1321
else
1322
info(0);
1323
}
1324
#endif
1325
1326
/*
1327
* Called once each second in verbose mode while dumping to file
1328
*/
1329
#ifdef USE_WIN32_MM_TIMER
1330
void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1331
DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1332
{
1333
struct pcap_stat stat;
1334
1335
if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1336
fprintf(stderr, "Got %u\r", packets_captured);
1337
}
1338
#elif defined(HAVE_ALARM)
1339
static void verbose_stats_dump(int sig _U_)
1340
{
1341
struct pcap_stat stat;
1342
1343
if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1344
fprintf(stderr, "Got %u\r", packets_captured);
1345
alarm(1);
1346
}
1347
#endif
1348
1349
static void
1350
usage(void)
1351
{
1352
extern char version[];
1353
#ifndef HAVE_PCAP_LIB_VERSION
1354
#if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1355
extern char pcap_version[];
1356
#else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1357
static char pcap_version[] = "unknown";
1358
#endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1359
#endif /* HAVE_PCAP_LIB_VERSION */
1360
1361
#ifdef HAVE_PCAP_LIB_VERSION
1362
#ifdef WIN32
1363
(void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1364
#else /* WIN32 */
1365
(void)fprintf(stderr, "%s version %s\n", program_name, version);
1366
#endif /* WIN32 */
1367
(void)fprintf(stderr, "%s\n",pcap_lib_version());
1368
#else /* HAVE_PCAP_LIB_VERSION */
1369
#ifdef WIN32
1370
(void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1371
(void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1372
#else /* WIN32 */
1373
(void)fprintf(stderr, "%s version %s\n", program_name, version);
1374
(void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1375
#endif /* WIN32 */
1376
#endif /* HAVE_PCAP_LIB_VERSION */
1377
(void)fprintf(stderr,
1378
"Usage: %s [-aAd" D_FLAG "eflLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [-c count] [ -C file_size ]\n", program_name);
1379
(void)fprintf(stderr,
1380
"\t\t[ -E algo:secret ] [ -F file ] [ -i interface ] [ -M secret ]\n");
1381
(void)fprintf(stderr,
1382
"\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1383
(void)fprintf(stderr,
1384
"\t\t[ -W filecount ] [ -y datalinktype ] [ -Z user ]\n");
1385
(void)fprintf(stderr,
1386
"\t\t[ expression ]\n");
1387
exit(1);
1388
}
1389
1390
1391
1392
/* VARARGS */
1393
static void
1394
ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1395
{
1396
va_list ap;
1397
1398
(void)fprintf(stderr, "%s: ", program_name);
1399
va_start(ap, fmt);
1400
(void)vfprintf(stderr, fmt, ap);
1401
va_end(ap);
1402
if (*fmt) {
1403
fmt += strlen(fmt);
1404
if (fmt[-1] != '\n')
1405
(void)fputc('\n', stderr);
1406
}
1407
exit(1);
1408
/* NOTREACHED */
1409
}
1410
1411
/* VARARGS */
1412
static void
1413
ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1414
{
1415
va_list ap;
1416
1417
(void)fprintf(stderr, "%s: WARNING: ", program_name);
1418
va_start(ap, fmt);
1419
(void)vfprintf(stderr, fmt, ap);
1420
va_end(ap);
1421
if (*fmt) {
1422
fmt += strlen(fmt);
1423
if (fmt[-1] != '\n')
1424
(void)fputc('\n', stderr);
1425
}
1426
}
1427
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