Upgrade to tcpdump-4.0.0.
[dragonfly.git] / contrib / tcpdump / tcpdump.c
CommitLineData
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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
29static const char copyright[] _U_ =
30 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
31The Regents of the University of California. All rights reserved.\n";
32static const char rcsid[] _U_ =
ea7b4bf5 33 "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.271.2.11 2008-09-25 21:50:04 guy Exp $ (LBL)";
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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"
53extern int strcasecmp (const char *__s1, const char *__s2);
54extern 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>
ea7b4bf5 68#include <limits.h>
c8cf0f94 69#ifndef WIN32
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70#include <sys/wait.h>
71#include <sys/resource.h>
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72#include <pwd.h>
73#include <grp.h>
74#include <errno.h>
75#endif /* WIN32 */
76
ea7b4bf5 77
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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
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86#ifndef NAME_MAX
87#define NAME_MAX 255
88#endif
89
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90netdissect_options Gndo;
91netdissect_options *gndo = &Gndo;
92
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93int dflag; /* print filter code */
94int Lflag; /* list available data link types and exit */
ea7b4bf5 95char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
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96
97static int infodelay;
98static int infoprint;
99
100char *program_name;
101
102int32_t thiszone; /* seconds offset from gmt to local time */
103
104/* Forwards */
105static RETSIGTYPE cleanup(int);
ea7b4bf5 106static RETSIGTYPE child_cleanup(int);
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107static void usage(void) __attribute__((noreturn));
108static void show_dlts_and_exit(pcap_t *pd) __attribute__((noreturn));
109
110static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
111static void ndo_default_print(netdissect_options *, const u_char *, u_int);
112static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
113static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
114static void droproot(const char *, const char *);
115static void ndo_error(netdissect_options *ndo, const char *fmt, ...);
116static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
117
118#ifdef SIGINFO
119RETSIGTYPE 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
130static void info(int);
131static u_int packets_captured;
132
133typedef u_int (*if_printer)(const struct pcap_pkthdr *, const u_char *);
134
135struct printer {
136 if_printer f;
137 int type;
138};
139
140static struct printer printers[] = {
141 { arcnet_if_print, DLT_ARCNET },
142#ifdef DLT_ARCNET_LINUX
143 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
144#endif
145 { ether_if_print, DLT_EN10MB },
146 { token_if_print, DLT_IEEE802 },
147#ifdef DLT_LANE8023
148 { lane_if_print, DLT_LANE8023 },
149#endif
150#ifdef DLT_CIP
151 { cip_if_print, DLT_CIP },
152#endif
153#ifdef DLT_ATM_CLIP
154 { cip_if_print, DLT_ATM_CLIP },
155#endif
156 { sl_if_print, DLT_SLIP },
157#ifdef DLT_SLIP_BSDOS
158 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
159#endif
160 { ppp_if_print, DLT_PPP },
161#ifdef DLT_PPP_WITHDIRECTION
162 { ppp_if_print, DLT_PPP_WITHDIRECTION },
163#endif
164#ifdef DLT_PPP_BSDOS
165 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
166#endif
167 { fddi_if_print, DLT_FDDI },
168 { null_if_print, DLT_NULL },
169#ifdef DLT_LOOP
170 { null_if_print, DLT_LOOP },
171#endif
172 { raw_if_print, DLT_RAW },
173 { atm_if_print, DLT_ATM_RFC1483 },
174#ifdef DLT_C_HDLC
175 { chdlc_if_print, DLT_C_HDLC },
176#endif
177#ifdef DLT_HDLC
178 { chdlc_if_print, DLT_HDLC },
179#endif
180#ifdef DLT_PPP_SERIAL
181 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
182#endif
183#ifdef DLT_PPP_ETHER
184 { pppoe_if_print, DLT_PPP_ETHER },
185#endif
186#ifdef DLT_LINUX_SLL
187 { sll_if_print, DLT_LINUX_SLL },
188#endif
189#ifdef DLT_IEEE802_11
190 { ieee802_11_if_print, DLT_IEEE802_11},
191#endif
192#ifdef DLT_LTALK
193 { ltalk_if_print, DLT_LTALK },
194#endif
825e8fa1 195#if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
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196 { pflog_if_print, DLT_PFLOG },
197#endif
198#ifdef DLT_FR
199 { fr_if_print, DLT_FR },
200#endif
201#ifdef DLT_FRELAY
202 { fr_if_print, DLT_FRELAY },
203#endif
204#ifdef DLT_SUNATM
205 { sunatm_if_print, DLT_SUNATM },
206#endif
207#ifdef DLT_IP_OVER_FC
208 { ipfc_if_print, DLT_IP_OVER_FC },
209#endif
210#ifdef DLT_PRISM_HEADER
211 { prism_if_print, DLT_PRISM_HEADER },
212#endif
213#ifdef DLT_IEEE802_11_RADIO
214 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
215#endif
216#ifdef DLT_ENC
217 { enc_if_print, DLT_ENC },
218#endif
219#ifdef DLT_SYMANTEC_FIREWALL
220 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
221#endif
222#ifdef DLT_APPLE_IP_OVER_IEEE1394
223 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
224#endif
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225#ifdef DLT_IEEE802_11_RADIO_AVS
226 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
227#endif
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228#ifdef DLT_JUNIPER_ATM1
229 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
230#endif
231#ifdef DLT_JUNIPER_ATM2
232 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
233#endif
234#ifdef DLT_JUNIPER_MFR
235 { juniper_mfr_print, DLT_JUNIPER_MFR },
236#endif
237#ifdef DLT_JUNIPER_MLFR
238 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
239#endif
240#ifdef DLT_JUNIPER_MLPPP
241 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
242#endif
243#ifdef DLT_JUNIPER_PPPOE
244 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
245#endif
246#ifdef DLT_JUNIPER_PPPOE_ATM
247 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
248#endif
249#ifdef DLT_JUNIPER_GGSN
250 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
251#endif
252#ifdef DLT_JUNIPER_ES
253 { juniper_es_print, DLT_JUNIPER_ES },
254#endif
255#ifdef DLT_JUNIPER_MONITOR
256 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
257#endif
258#ifdef DLT_JUNIPER_SERVICES
259 { juniper_services_print, DLT_JUNIPER_SERVICES },
260#endif
261#ifdef DLT_JUNIPER_ETHER
262 { juniper_ether_print, DLT_JUNIPER_ETHER },
263#endif
264#ifdef DLT_JUNIPER_PPP
265 { juniper_ppp_print, DLT_JUNIPER_PPP },
266#endif
267#ifdef DLT_JUNIPER_FRELAY
268 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
269#endif
270#ifdef DLT_JUNIPER_CHDLC
271 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
272#endif
273#ifdef DLT_MFR
274 { mfr_if_print, DLT_MFR },
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275#endif
276#if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
277 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
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278#endif
279 { NULL, 0 },
280};
281
282static if_printer
283lookup_printer(int type)
284{
285 struct printer *p;
286
287 for (p = printers; p->f; ++p)
288 if (type == p->type)
289 return p->f;
290
291 return NULL;
292 /* NOTREACHED */
293}
294
295static pcap_t *pd;
296
297extern int optind;
298extern int opterr;
299extern char *optarg;
300
301struct print_info {
302 if_printer printer;
303};
304
305struct dump_info {
306 char *WFileName;
ea7b4bf5 307 char *CurrentFileName;
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308 pcap_t *pd;
309 pcap_dumper_t *p;
310};
311
312static void
313show_dlts_and_exit(pcap_t *pd)
314{
315 int n_dlts;
316 int *dlts = 0;
317 const char *dlt_name;
318
319 n_dlts = pcap_list_datalinks(pd, &dlts);
320 if (n_dlts < 0)
321 error("%s", pcap_geterr(pd));
322 else if (n_dlts == 0 || !dlts)
323 error("No data link types.");
324
325 (void) fprintf(stderr, "Data link types (use option -y to set):\n");
326
327 while (--n_dlts >= 0) {
328 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
329 if (dlt_name != NULL) {
330 (void) fprintf(stderr, " %s (%s)", dlt_name,
331 pcap_datalink_val_to_description(dlts[n_dlts]));
332
333 /*
334 * OK, does tcpdump handle that type?
335 */
336 if (lookup_printer(dlts[n_dlts]) == NULL)
ea7b4bf5 337 (void) fprintf(stderr, " (printing not supported)");
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338 putchar('\n');
339 } else {
ea7b4bf5 340 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
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341 dlts[n_dlts]);
342 }
343 }
344 free(dlts);
345 exit(0);
346}
347
348/*
349 * Set up flags that might or might not be supported depending on the
350 * version of libpcap we're using.
351 */
ea7b4bf5 352#if defined(HAVE_PCAP_CREATE) || defined(WIN32)
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353#define B_FLAG "B:"
354#define B_FLAG_USAGE " [ -B size ]"
ea7b4bf5 355#else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
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356#define B_FLAG
357#define B_FLAG_USAGE
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358#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
359
360#ifdef HAVE_PCAP_CREATE
361#define I_FLAG "I"
362#else /* HAVE_PCAP_CREATE */
363#define I_FLAG
364#endif /* HAVE_PCAP_CREATE */
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365
366#ifdef HAVE_PCAP_FINDALLDEVS
367#ifndef HAVE_PCAP_IF_T
368#undef HAVE_PCAP_FINDALLDEVS
369#endif
370#endif
371
372#ifdef HAVE_PCAP_FINDALLDEVS
373#define D_FLAG "D"
374#else
375#define D_FLAG
376#endif
377
378#ifdef HAVE_PCAP_DUMP_FLUSH
379#define U_FLAG "U"
380#else
381#define U_FLAG
382#endif
383
384#ifndef WIN32
385/* Drop root privileges and chroot if necessary */
386static void
387droproot(const char *username, const char *chroot_dir)
388{
389 struct passwd *pw = NULL;
390
391 if (chroot_dir && !username) {
392 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
393 exit(1);
394 }
395
396 pw = getpwnam(username);
397 if (pw) {
398 if (chroot_dir) {
399 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
400 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
401 chroot_dir, pcap_strerror(errno));
402 exit(1);
403 }
404 }
405 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
406 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
407 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
408 username,
409 (unsigned long)pw->pw_uid,
410 (unsigned long)pw->pw_gid,
411 pcap_strerror(errno));
412 exit(1);
413 }
414 }
415 else {
416 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
417 username);
418 exit(1);
419 }
420}
421#endif /* WIN32 */
422
423static int
424getWflagChars(int x)
425{
426 int c = 0;
427
428 x -= 1;
429 while (x > 0) {
430 c += 1;
431 x /= 10;
432 }
433
434 return c;
435}
436
437
438static void
439MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
440{
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441 char *filename = malloc(NAME_MAX + 1);
442
443 /* Process with strftime if Gflag is set. */
444 if (Gflag != 0) {
445 struct tm *local_tm;
446
447 /* Convert Gflag_time to a usable format */
448 if ((local_tm = localtime(&Gflag_time)) == NULL) {
449 error("MakeTimedFilename: localtime");
450 }
451
452 /* There's no good way to detect an error in strftime since a return
453 * value of 0 isn't necessarily failure.
454 */
455 strftime(filename, NAME_MAX, orig_name, local_tm);
456 } else {
457 strncpy(filename, orig_name, NAME_MAX);
458 }
459
c8cf0f94 460 if (cnt == 0 && max_chars == 0)
ea7b4bf5 461 strncpy(buffer, filename, NAME_MAX + 1);
c8cf0f94 462 else
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463 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
464 /* Report an error if the filename is too large */
465 error("too many output files or filename is too long (> %d)", NAME_MAX);
466 free(filename);
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467}
468
469static int tcpdump_printf(netdissect_options *ndo _U_,
470 const char *fmt, ...)
471{
472
473 va_list args;
474 int ret;
475
476 va_start(args, fmt);
477 ret=vfprintf(stdout, fmt, args);
478 va_end(args);
479
480 return ret;
481}
482
483int
484main(int argc, char **argv)
485{
486 register int cnt, op, i;
487 bpf_u_int32 localnet, netmask;
ea7b4bf5 488 register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
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489 pcap_handler callback;
490 int type;
491 struct bpf_program fcode;
492#ifndef WIN32
493 RETSIGTYPE (*oldhandler)(int);
494#endif
495 struct print_info printinfo;
496 struct dump_info dumpinfo;
497 u_char *pcap_userdata;
498 char ebuf[PCAP_ERRBUF_SIZE];
499 char *username = NULL;
500 char *chroot_dir = NULL;
501#ifdef HAVE_PCAP_FINDALLDEVS
502 pcap_if_t *devpointer;
503 int devnum;
504#endif
505 int status;
506#ifdef WIN32
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507 if(wsockinit() != 0) return 1;
508#endif /* WIN32 */
509
510 gndo->ndo_Oflag=1;
511 gndo->ndo_Rflag=1;
512 gndo->ndo_dlt=-1;
513 gndo->ndo_default_print=ndo_default_print;
514 gndo->ndo_printf=tcpdump_printf;
515 gndo->ndo_error=ndo_error;
516 gndo->ndo_warning=ndo_warning;
517 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
518
519 cnt = -1;
520 device = NULL;
521 infile = NULL;
522 RFileName = NULL;
523 WFileName = NULL;
524 if ((cp = strrchr(argv[0], '/')) != NULL)
525 program_name = cp + 1;
526 else
527 program_name = argv[0];
528
529 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
530 error("%s", ebuf);
531
532#ifdef LIBSMI
533 smiInit("tcpdump");
534#endif
535
536 opterr = 0;
537 while (
ea7b4bf5 538 (op = getopt(argc, argv, "aA" B_FLAG "c:C:d" D_FLAG "eE:fF:G:i:" I_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "vw:W:xXy:Yz:Z:")) != -1)
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539 switch (op) {
540
541 case 'a':
542 /* compatibility for old -a */
543 break;
544
545 case 'A':
546 ++Aflag;
547 break;
548
ea7b4bf5 549#if defined(HAVE_PCAP_CREATE) || defined(WIN32)
c8cf0f94 550 case 'B':
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551 Bflag = atoi(optarg)*1024;
552 if (Bflag <= 0)
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553 error("invalid packet buffer size %s", optarg);
554 break;
ea7b4bf5 555#endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
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556
557 case 'c':
558 cnt = atoi(optarg);
559 if (cnt <= 0)
560 error("invalid packet count %s", optarg);
561 break;
562
563 case 'C':
564 Cflag = atoi(optarg) * 1000000;
565 if (Cflag < 0)
566 error("invalid file size %s", optarg);
567 break;
568
569 case 'd':
570 ++dflag;
571 break;
572
573#ifdef HAVE_PCAP_FINDALLDEVS
574 case 'D':
575 if (pcap_findalldevs(&devpointer, ebuf) < 0)
576 error("%s", ebuf);
577 else {
578 for (i = 0; devpointer != 0; i++) {
579 printf("%d.%s", i+1, devpointer->name);
580 if (devpointer->description != NULL)
581 printf(" (%s)", devpointer->description);
582 printf("\n");
583 devpointer = devpointer->next;
584 }
585 }
586 return 0;
587#endif /* HAVE_PCAP_FINDALLDEVS */
588
589 case 'L':
590 Lflag++;
591 break;
592
593 case 'e':
594 ++eflag;
595 break;
596
597 case 'E':
598#ifndef HAVE_LIBCRYPTO
599 warning("crypto code not compiled in");
600#endif
601 gndo->ndo_espsecret = optarg;
602 break;
603
604 case 'f':
605 ++fflag;
606 break;
607
608 case 'F':
609 infile = optarg;
610 break;
611
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612 case 'G':
613 Gflag = atoi(optarg);
614 if (Gflag < 0)
615 error("invalid number of seconds %s", optarg);
616
617 /* We will create one file initially. */
618 Gflag_count = 0;
619
620 /* Grab the current time for rotation use. */
621 if ((Gflag_time = time(NULL)) == (time_t)-1) {
622 error("main: can't get current time: %s",
623 pcap_strerror(errno));
624 }
625 break;
626
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627 case 'i':
628 if (optarg[0] == '0' && optarg[1] == 0)
629 error("Invalid adapter index");
630
631#ifdef HAVE_PCAP_FINDALLDEVS
632 /*
633 * If the argument is a number, treat it as
634 * an index into the list of adapters, as
635 * printed by "tcpdump -D".
636 *
637 * This should be OK on UNIX systems, as interfaces
638 * shouldn't have names that begin with digits.
639 * It can be useful on Windows, where more than
640 * one interface can have the same name.
641 */
642 if ((devnum = atoi(optarg)) != 0) {
643 if (devnum < 0)
644 error("Invalid adapter index");
645
646 if (pcap_findalldevs(&devpointer, ebuf) < 0)
647 error("%s", ebuf);
648 else {
649 for (i = 0; i < devnum-1; i++){
650 devpointer = devpointer->next;
651 if (devpointer == NULL)
652 error("Invalid adapter index");
653 }
654 }
655 device = devpointer->name;
656 break;
657 }
658#endif /* HAVE_PCAP_FINDALLDEVS */
659 device = optarg;
660 break;
661
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662#ifdef HAVE_PCAP_CREATE
663 case 'I':
664 ++Iflag;
665 break;
666#endif /* HAVE_PCAP_CREATE */
667
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668 case 'l':
669#ifdef WIN32
670 /*
671 * _IOLBF is the same as _IOFBF in Microsoft's C
672 * libraries; the only alternative they offer
673 * is _IONBF.
674 *
675 * XXX - this should really be checking for MSVC++,
676 * not WIN32, if, for example, MinGW has its own
677 * C library that is more UNIX-compatible.
678 */
679 setvbuf(stdout, NULL, _IONBF, 0);
680#else /* WIN32 */
681#ifdef HAVE_SETLINEBUF
682 setlinebuf(stdout);
683#else
684 setvbuf(stdout, NULL, _IOLBF, 0);
685#endif
686#endif /* WIN32 */
687 break;
688
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689 case 'K':
690 ++Kflag;
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691 break;
692
693 case 'm':
694#ifdef LIBSMI
ea7b4bf5 695 if (smiLoadModule(optarg) == 0) {
c8cf0f94 696 error("could not load MIB module %s", optarg);
ea7b4bf5 697 }
c8cf0f94
PA
698 sflag = 1;
699#else
700 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
701 program_name, optarg);
702 (void)fprintf(stderr, "(no libsmi support)\n");
703#endif
704 break;
705
706 case 'M':
707 /* TCP-MD5 shared secret */
708#ifndef HAVE_LIBCRYPTO
709 warning("crypto code not compiled in");
710#endif
711 tcpmd5secret = optarg;
712 break;
713
ea7b4bf5
PA
714 case 'n':
715 ++nflag;
716 break;
717
718 case 'N':
719 ++Nflag;
720 break;
721
c8cf0f94
PA
722 case 'O':
723 Oflag = 0;
724 break;
725
726 case 'p':
727 ++pflag;
728 break;
729
730 case 'q':
731 ++qflag;
732 ++suppress_default_print;
733 break;
734
735 case 'r':
736 RFileName = optarg;
737 break;
738
739 case 'R':
740 Rflag = 0;
741 break;
742
743 case 's': {
744 char *end;
745
746 snaplen = strtol(optarg, &end, 0);
747 if (optarg == end || *end != '\0'
748 || snaplen < 0 || snaplen > 65535)
749 error("invalid snaplen %s", optarg);
750 else if (snaplen == 0)
751 snaplen = 65535;
752 break;
753 }
754
755 case 'S':
756 ++Sflag;
757 break;
758
759 case 't':
760 ++tflag;
761 break;
762
763 case 'T':
764 if (strcasecmp(optarg, "vat") == 0)
765 packettype = PT_VAT;
766 else if (strcasecmp(optarg, "wb") == 0)
767 packettype = PT_WB;
768 else if (strcasecmp(optarg, "rpc") == 0)
769 packettype = PT_RPC;
770 else if (strcasecmp(optarg, "rtp") == 0)
771 packettype = PT_RTP;
772 else if (strcasecmp(optarg, "rtcp") == 0)
773 packettype = PT_RTCP;
774 else if (strcasecmp(optarg, "snmp") == 0)
775 packettype = PT_SNMP;
776 else if (strcasecmp(optarg, "cnfp") == 0)
777 packettype = PT_CNFP;
778 else if (strcasecmp(optarg, "tftp") == 0)
779 packettype = PT_TFTP;
780 else if (strcasecmp(optarg, "aodv") == 0)
781 packettype = PT_AODV;
782 else
783 error("unknown packet type `%s'", optarg);
784 break;
785
786 case 'u':
787 ++uflag;
788 break;
789
790#ifdef HAVE_PCAP_DUMP_FLUSH
791 case 'U':
792 ++Uflag;
793 break;
794#endif
795
796 case 'v':
797 ++vflag;
798 break;
799
800 case 'w':
801 WFileName = optarg;
802 break;
803
804 case 'W':
805 Wflag = atoi(optarg);
806 if (Wflag < 0)
807 error("invalid number of output files %s", optarg);
808 WflagChars = getWflagChars(Wflag);
809 break;
810
811 case 'x':
812 ++xflag;
813 ++suppress_default_print;
814 break;
815
816 case 'X':
817 ++Xflag;
818 ++suppress_default_print;
819 break;
820
821 case 'y':
822 gndo->ndo_dltname = optarg;
823 gndo->ndo_dlt =
824 pcap_datalink_name_to_val(gndo->ndo_dltname);
825 if (gndo->ndo_dlt < 0)
826 error("invalid data link type %s", gndo->ndo_dltname);
827 break;
828
829#if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
830 case 'Y':
831 {
832 /* Undocumented flag */
833#ifdef HAVE_PCAP_DEBUG
834 extern int pcap_debug;
835 pcap_debug = 1;
836#else
837 extern int yydebug;
838 yydebug = 1;
839#endif
840 }
841 break;
842#endif
ea7b4bf5
PA
843 case 'z':
844 if (optarg) {
845 zflag = strdup(optarg);
846 } else {
847 usage();
848 /* NOTREACHED */
849 }
850 break;
851
c8cf0f94
PA
852 case 'Z':
853 if (optarg) {
854 username = strdup(optarg);
855 }
856 else {
857 usage();
858 /* NOTREACHED */
859 }
860 break;
861
862 default:
863 usage();
864 /* NOTREACHED */
865 }
866
867 switch (tflag) {
868
869 case 0: /* Default */
870 case 4: /* Default + Date*/
871 thiszone = gmt2local(0);
872 break;
873
874 case 1: /* No time stamp */
875 case 2: /* Unix timeval style */
876 case 3: /* Microseconds since previous packet */
ea7b4bf5 877 case 5: /* Microseconds since first packet */
c8cf0f94
PA
878 break;
879
880 default: /* Not supported */
ea7b4bf5 881 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
c8cf0f94
PA
882 break;
883 }
884
885#ifdef WITH_CHROOT
886 /* if run as root, prepare for chrooting */
887 if (getuid() == 0 || geteuid() == 0) {
888 /* future extensibility for cmd-line arguments */
889 if (!chroot_dir)
890 chroot_dir = WITH_CHROOT;
891 }
892#endif
893
894#ifdef WITH_USER
895 /* if run as root, prepare for dropping root privileges */
896 if (getuid() == 0 || geteuid() == 0) {
897 /* Run with '-Z root' to restore old behaviour */
898 if (!username)
899 username = WITH_USER;
900 }
901#endif
902
903 if (RFileName != NULL) {
904 int dlt;
905 const char *dlt_name;
906
907#ifndef WIN32
908 /*
909 * We don't need network access, so relinquish any set-UID
910 * or set-GID privileges we have (if any).
911 *
912 * We do *not* want set-UID privileges when opening a
913 * trace file, as that might let the user read other
914 * people's trace files (especially if we're set-UID
915 * root).
916 */
917 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
918 fprintf(stderr, "Warning: setgid/setuid failed !\n");
919#endif /* WIN32 */
920 pd = pcap_open_offline(RFileName, ebuf);
921 if (pd == NULL)
922 error("%s", ebuf);
923 dlt = pcap_datalink(pd);
924 dlt_name = pcap_datalink_val_to_name(dlt);
925 if (dlt_name == NULL) {
926 fprintf(stderr, "reading from file %s, link-type %u\n",
927 RFileName, dlt);
928 } else {
929 fprintf(stderr,
930 "reading from file %s, link-type %s (%s)\n",
931 RFileName, dlt_name,
932 pcap_datalink_val_to_description(dlt));
933 }
934 localnet = 0;
935 netmask = 0;
936 if (fflag != 0)
937 error("-f and -r options are incompatible");
938 } else {
939 if (device == NULL) {
940 device = pcap_lookupdev(ebuf);
941 if (device == NULL)
942 error("%s", ebuf);
943 }
944#ifdef WIN32
945 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
946 { //a Unicode string has a \0 as second byte (so strlen() is 1)
947 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
948 }
949 else
950 {
951 fprintf(stderr, "%s: listening on %s\n", program_name, device);
952 }
953
954 fflush(stderr);
955#endif /* WIN32 */
ea7b4bf5
PA
956#ifdef HAVE_PCAP_CREATE
957 pd = pcap_create(device, ebuf);
958 if (pd == NULL)
959 error("%s", ebuf);
960 status = pcap_set_snaplen(pd, snaplen);
961 if (status != 0)
962 error("%s: pcap_set_snaplen failed: %s",
963 device, pcap_statustostr(status));
964 status = pcap_set_promisc(pd, !pflag);
965 if (status != 0)
966 error("%s: pcap_set_promisc failed: %s",
967 device, pcap_statustostr(status));
968 if (Iflag) {
969 status = pcap_set_rfmon(pd, 1);
970 if (status != 0)
971 error("%s: pcap_set_rfmon failed: %s",
972 device, pcap_statustostr(status));
973 }
974 status = pcap_set_timeout(pd, 1000);
975 if (status != 0)
976 error("%s: pcap_set_timeout failed: %s",
977 device, pcap_statustostr(status));
978 if (Bflag != 0) {
979 status = pcap_set_buffer_size(pd, Bflag);
980 if (status != 0)
981 error("%s: pcap_set_buffer_size failed: %s",
982 device, pcap_statustostr(status));
983 }
984 status = pcap_activate(pd);
985 if (status < 0) {
986 /*
987 * pcap_activate() failed.
988 */
989 cp = pcap_geterr(pd);
990 if (status == PCAP_ERROR)
991 error("%s", cp);
992 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
993 status == PCAP_ERROR_PERM_DENIED) &&
994 *cp != '\0')
995 error("%s: %s\n(%s)", device,
996 pcap_statustostr(status), cp);
997 else
998 error("%s: %s", device,
999 pcap_statustostr(status));
1000 } else if (status > 0) {
1001 /*
1002 * pcap_activate() succeeded, but it's warning us
1003 * of a problem it had.
1004 */
1005 cp = pcap_geterr(pd);
1006 if (status == PCAP_WARNING)
1007 warning("%s", cp);
1008 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1009 *cp != '\0')
1010 warning("%s: %s\n(%s)", device,
1011 pcap_statustostr(status), cp);
1012 else
1013 warning("%s: %s", device,
1014 pcap_statustostr(status));
1015 }
1016#else
c8cf0f94
PA
1017 *ebuf = '\0';
1018 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1019 if (pd == NULL)
1020 error("%s", ebuf);
1021 else if (*ebuf)
1022 warning("%s", ebuf);
ea7b4bf5 1023#endif /* HAVE_PCAP_CREATE */
c8cf0f94
PA
1024 /*
1025 * Let user own process after socket has been opened.
1026 */
1027#ifndef WIN32
1028 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1029 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1030#endif /* WIN32 */
ea7b4bf5
PA
1031#if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1032 if(Bflag != 0)
1033 if(pcap_setbuff(pd, Bflag)==-1){
c8cf0f94
PA
1034 error("%s", pcap_geterr(pd));
1035 }
ea7b4bf5 1036#endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
c8cf0f94
PA
1037 if (Lflag)
1038 show_dlts_and_exit(pd);
1039 if (gndo->ndo_dlt >= 0) {
1040#ifdef HAVE_PCAP_SET_DATALINK
1041 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1042 error("%s", pcap_geterr(pd));
1043#else
1044 /*
1045 * We don't actually support changing the
1046 * data link type, so we only let them
1047 * set it to what it already is.
1048 */
1049 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1050 error("%s is not one of the DLTs supported by this device\n",
1051 gndo->ndo_dltname);
1052 }
1053#endif
1054 (void)fprintf(stderr, "%s: data link type %s\n",
ea7b4bf5 1055 program_name, gndo->ndo_dltname);
c8cf0f94
PA
1056 (void)fflush(stderr);
1057 }
1058 i = pcap_snapshot(pd);
1059 if (snaplen < i) {
1060 warning("snaplen raised from %d to %d", snaplen, i);
1061 snaplen = i;
1062 }
1063 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1064 localnet = 0;
1065 netmask = 0;
1066 warning("%s", ebuf);
1067 }
1068 }
1069 if (infile)
1070 cmdbuf = read_infile(infile);
1071 else
1072 cmdbuf = copy_argv(&argv[optind]);
1073
1074 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1075 error("%s", pcap_geterr(pd));
1076 if (dflag) {
1077 bpf_dump(&fcode, dflag);
1078 pcap_close(pd);
1079 exit(0);
1080 }
1081 init_addrtoname(localnet, netmask);
ea7b4bf5 1082 init_checksum();
c8cf0f94
PA
1083
1084#ifndef WIN32
1085 (void)setsignal(SIGPIPE, cleanup);
c8cf0f94
PA
1086 (void)setsignal(SIGTERM, cleanup);
1087 (void)setsignal(SIGINT, cleanup);
ea7b4bf5
PA
1088 (void)setsignal(SIGCHLD, child_cleanup);
1089#endif /* WIN32 */
c8cf0f94
PA
1090 /* Cooperate with nohup(1) */
1091#ifndef WIN32
1092 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1093 (void)setsignal(SIGHUP, oldhandler);
1094#endif /* WIN32 */
1095
1096 if (pcap_setfilter(pd, &fcode) < 0)
1097 error("%s", pcap_geterr(pd));
1098 if (WFileName) {
1099 pcap_dumper_t *p;
ea7b4bf5
PA
1100 /* Do not exceed the default NAME_MAX for files. */
1101 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1102
1103 if (dumpinfo.CurrentFileName == NULL)
1104 error("malloc of dumpinfo.CurrentFileName");
1105
1106 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1107 if (Cflag != 0)
1108 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1109 else
1110 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
c8cf0f94 1111
ea7b4bf5 1112 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
c8cf0f94
PA
1113 if (p == NULL)
1114 error("%s", pcap_geterr(pd));
ea7b4bf5 1115 if (Cflag != 0 || Gflag != 0) {
c8cf0f94
PA
1116 callback = dump_packet_and_trunc;
1117 dumpinfo.WFileName = WFileName;
1118 dumpinfo.pd = pd;
1119 dumpinfo.p = p;
1120 pcap_userdata = (u_char *)&dumpinfo;
1121 } else {
1122 callback = dump_packet;
1123 pcap_userdata = (u_char *)p;
1124 }
1125 } else {
1126 type = pcap_datalink(pd);
1127 printinfo.printer = lookup_printer(type);
1128 if (printinfo.printer == NULL) {
1129 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1130 if (gndo->ndo_dltname != NULL)
1131 error("unsupported data link type %s",
1132 gndo->ndo_dltname);
1133 else
1134 error("unsupported data link type %d", type);
1135 }
1136 callback = print_packet;
1137 pcap_userdata = (u_char *)&printinfo;
1138 }
1139#ifndef WIN32
1140 /*
1141 * We cannot do this earlier, because we want to be able to open
1142 * the file (if done) for writing before giving up permissions.
1143 */
1144 if (getuid() == 0 || geteuid() == 0) {
1145 if (username || chroot_dir)
1146 droproot(username, chroot_dir);
1147 }
1148#endif /* WIN32 */
1149#ifdef SIGINFO
ea7b4bf5
PA
1150 /*
1151 * We can't get statistics when reading from a file rather
1152 * than capturing from a device.
1153 */
1154 if (RFileName == NULL)
1155 (void)setsignal(SIGINFO, requestinfo);
c8cf0f94
PA
1156#endif
1157
1158 if (vflag > 0 && WFileName) {
1159 /*
1160 * When capturing to a file, "-v" means tcpdump should,
1161 * every 10 secodns, "v"erbosely report the number of
1162 * packets captured.
1163 */
1164#ifdef USE_WIN32_MM_TIMER
1165 /* call verbose_stats_dump() each 1000 +/-100msec */
1166 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1167 setvbuf(stderr, NULL, _IONBF, 0);
1168#elif defined(HAVE_ALARM)
1169 (void)setsignal(SIGALRM, verbose_stats_dump);
1170 alarm(1);
1171#endif
1172 }
1173
1174#ifndef WIN32
1175 if (RFileName == NULL) {
1176 int dlt;
1177 const char *dlt_name;
1178
1179 if (!vflag && !WFileName) {
1180 (void)fprintf(stderr,
1181 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1182 program_name);
1183 } else
1184 (void)fprintf(stderr, "%s: ", program_name);
1185 dlt = pcap_datalink(pd);
1186 dlt_name = pcap_datalink_val_to_name(dlt);
1187 if (dlt_name == NULL) {
1188 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1189 device, dlt, snaplen);
1190 } else {
1191 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1192 device, dlt_name,
1193 pcap_datalink_val_to_description(dlt), snaplen);
1194 }
1195 (void)fflush(stderr);
1196 }
1197#endif /* WIN32 */
1198 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1199 if (WFileName == NULL) {
1200 /*
1201 * We're printing packets. Flush the printed output,
1202 * so it doesn't get intermingled with error output.
1203 */
1204 if (status == -2) {
1205 /*
1206 * We got interrupted, so perhaps we didn't
1207 * manage to finish a line we were printing.
1208 * Print an extra newline, just in case.
1209 */
1210 putchar('\n');
1211 }
1212 (void)fflush(stdout);
1213 }
1214 if (status == -1) {
1215 /*
1216 * Error. Report it.
1217 */
1218 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1219 program_name, pcap_geterr(pd));
1220 }
1221 if (RFileName == NULL) {
1222 /*
1223 * We're doing a live capture. Report the capture
1224 * statistics.
1225 */
1226 info(1);
1227 }
1228 pcap_close(pd);
1229 exit(status == -1 ? 1 : 0);
1230}
1231
1232/* make a clean exit on interrupts */
1233static RETSIGTYPE
1234cleanup(int signo _U_)
1235{
1236#ifdef USE_WIN32_MM_TIMER
1237 if (timer_id)
1238 timeKillEvent(timer_id);
1239 timer_id = 0;
1240#elif defined(HAVE_ALARM)
1241 alarm(0);
1242#endif
1243
1244#ifdef HAVE_PCAP_BREAKLOOP
1245 /*
1246 * We have "pcap_breakloop()"; use it, so that we do as little
1247 * as possible in the signal handler (it's probably not safe
1248 * to do anything with standard I/O streams in a signal handler -
1249 * the ANSI C standard doesn't say it is).
1250 */
1251 pcap_breakloop(pd);
1252#else
1253 /*
1254 * We don't have "pcap_breakloop()"; this isn't safe, but
1255 * it's the best we can do. Print the summary if we're
1256 * not reading from a savefile - i.e., if we're doing a
1257 * live capture - and exit.
1258 */
1259 if (pd != NULL && pcap_file(pd) == NULL) {
1260 /*
1261 * We got interrupted, so perhaps we didn't
1262 * manage to finish a line we were printing.
1263 * Print an extra newline, just in case.
1264 */
1265 putchar('\n');
1266 (void)fflush(stdout);
1267 info(1);
1268 }
1269 exit(0);
1270#endif
1271}
1272
ea7b4bf5
PA
1273/*
1274 On windows, we do not use a fork, so we do not care less about
1275 waiting a child processes to die
1276 */
1277#ifndef WIN32
1278static RETSIGTYPE
1279child_cleanup(int signo _U_)
1280{
1281 wait(NULL);
1282}
1283#endif /* WIN32 */
1284
c8cf0f94
PA
1285static void
1286info(register int verbose)
1287{
1288 struct pcap_stat stat;
1289
1290 if (pcap_stats(pd, &stat) < 0) {
1291 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
ea7b4bf5 1292 infoprint = 0;
c8cf0f94
PA
1293 return;
1294 }
1295
1296 if (!verbose)
1297 fprintf(stderr, "%s: ", program_name);
1298
1299 (void)fprintf(stderr, "%u packets captured", packets_captured);
1300 if (!verbose)
1301 fputs(", ", stderr);
1302 else
1303 putc('\n', stderr);
1304 (void)fprintf(stderr, "%d packets received by filter", stat.ps_recv);
1305 if (!verbose)
1306 fputs(", ", stderr);
1307 else
1308 putc('\n', stderr);
1309 (void)fprintf(stderr, "%d packets dropped by kernel\n", stat.ps_drop);
1310 infoprint = 0;
1311}
1312
ea7b4bf5
PA
1313#ifndef WIN32
1314static void
1315compress_savefile(const char *filename)
1316{
1317 if (fork())
1318 return;
1319 /*
1320 * Set to lowest priority so that this doesn't disturb the capture
1321 */
1322#ifdef NZERO
1323 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1324#else
1325 setpriority(PRIO_PROCESS, 0, 19);
1326#endif
1327 if (execlp(zflag, zflag, filename, NULL) == -1)
1328 fprintf(stderr,
1329 "compress_savefile:execlp(%s, %s): %s\n",
1330 zflag,
1331 filename,
1332 strerror(errno));
1333}
1334#else /* WIN32 */
1335static void
1336compress_savefile(const char *filename)
1337{
1338 fprintf(stderr,
1339 "compress_savefile failed. Functionality not implemented under windows\n");
1340}
1341#endif /* WIN32 */
1342
c8cf0f94
PA
1343static void
1344dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1345{
1346 struct dump_info *dump_info;
c8cf0f94
PA
1347
1348 ++packets_captured;
1349
1350 ++infodelay;
1351
1352 dump_info = (struct dump_info *)user;
1353
ea7b4bf5
PA
1354 /*
1355 * XXX - this won't force the file to rotate on the specified time
1356 * boundary, but it will rotate on the first packet received after the
1357 * specified Gflag number of seconds. Note: if a Gflag time boundary
1358 * and a Cflag size boundary coincide, the time rotation will occur
1359 * first thereby cancelling the Cflag boundary (since the file should
1360 * be 0).
1361 */
1362 if (Gflag != 0) {
1363 /* Check if it is time to rotate */
1364 time_t t;
1365
1366 /* Get the current time */
1367 if ((t = time(NULL)) == (time_t)-1) {
1368 error("dump_and_trunc_packet: can't get current_time: %s",
1369 pcap_strerror(errno));
1370 }
1371
1372
1373 /* If the time is greater than the specified window, rotate */
1374 if (t - Gflag_time >= Gflag) {
1375 /* Update the Gflag_time */
1376 Gflag_time = t;
1377 /* Update Gflag_count */
1378 Gflag_count++;
1379 /*
1380 * Close the current file and open a new one.
1381 */
1382 pcap_dump_close(dump_info->p);
1383
1384 /*
1385 * Compress the file we just closed, if the user asked for it
1386 */
1387 if (zflag != NULL)
1388 compress_savefile(dump_info->CurrentFileName);
1389
1390 /*
1391 * Check to see if we've exceeded the Wflag (when
1392 * not using Cflag).
1393 */
1394 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1395 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1396 Wflag);
1397 exit(0);
1398 /* NOTREACHED */
1399 }
1400 if (dump_info->CurrentFileName != NULL)
1401 free(dump_info->CurrentFileName);
1402 /* Allocate space for max filename + \0. */
1403 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1404 if (dump_info->CurrentFileName == NULL)
1405 error("dump_packet_and_trunc: malloc");
1406 /*
1407 * This is always the first file in the Cflag
1408 * rotation: e.g. 0
1409 * We also don't need numbering if Cflag is not set.
1410 */
1411 if (Cflag != 0)
1412 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1413 WflagChars);
1414 else
1415 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1416
1417 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1418 if (dump_info->p == NULL)
1419 error("%s", pcap_geterr(pd));
1420 }
1421 }
1422
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PA
1423 /*
1424 * XXX - this won't prevent capture files from getting
1425 * larger than Cflag - the last packet written to the
1426 * file could put it over Cflag.
1427 */
ea7b4bf5 1428 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
c8cf0f94
PA
1429 /*
1430 * Close the current file and open a new one.
1431 */
1432 pcap_dump_close(dump_info->p);
ea7b4bf5
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1433
1434 /*
1435 * Compress the file we just closed, if the user asked for it
1436 */
1437 if (zflag != NULL)
1438 compress_savefile(dump_info->CurrentFileName);
1439
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PA
1440 Cflag_count++;
1441 if (Wflag > 0) {
1442 if (Cflag_count >= Wflag)
1443 Cflag_count = 0;
c8cf0f94 1444 }
ea7b4bf5
PA
1445 if (dump_info->CurrentFileName != NULL)
1446 free(dump_info->CurrentFileName);
1447 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1448 if (dump_info->CurrentFileName == NULL)
c8cf0f94 1449 error("dump_packet_and_trunc: malloc");
ea7b4bf5
PA
1450 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1451 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
c8cf0f94
PA
1452 if (dump_info->p == NULL)
1453 error("%s", pcap_geterr(pd));
1454 }
1455
1456 pcap_dump((u_char *)dump_info->p, h, sp);
1457#ifdef HAVE_PCAP_DUMP_FLUSH
1458 if (Uflag)
1459 pcap_dump_flush(dump_info->p);
1460#endif
1461
1462 --infodelay;
1463 if (infoprint)
1464 info(0);
1465}
1466
1467static void
1468dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1469{
1470 ++packets_captured;
1471
1472 ++infodelay;
1473
1474 pcap_dump(user, h, sp);
1475#ifdef HAVE_PCAP_DUMP_FLUSH
1476 if (Uflag)
1477 pcap_dump_flush((pcap_dumper_t *)user);
1478#endif
1479
1480 --infodelay;
1481 if (infoprint)
1482 info(0);
1483}
1484
1485static void
1486print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1487{
1488 struct print_info *print_info;
1489 u_int hdrlen;
1490
1491 ++packets_captured;
1492
1493 ++infodelay;
1494 ts_print(&h->ts);
1495
1496 print_info = (struct print_info *)user;
1497
1498 /*
1499 * Some printers want to check that they're not walking off the
1500 * end of the packet.
1501 * Rather than pass it all the way down, we set this global.
1502 */
1503 snapend = sp + h->caplen;
1504
1505 hdrlen = (*print_info->printer)(h, sp);
1506 if (Xflag) {
1507 /*
1508 * Print the raw packet data in hex and ASCII.
1509 */
1510 if (Xflag > 1) {
1511 /*
1512 * Include the link-layer header.
1513 */
1514 hex_and_ascii_print("\n\t", sp, h->caplen);
1515 } else {
1516 /*
1517 * Don't include the link-layer header - and if
1518 * we have nothing past the link-layer header,
1519 * print nothing.
1520 */
1521 if (h->caplen > hdrlen)
1522 hex_and_ascii_print("\n\t", sp + hdrlen,
1523 h->caplen - hdrlen);
1524 }
1525 } else if (xflag) {
1526 /*
1527 * Print the raw packet data in hex.
1528 */
1529 if (xflag > 1) {
1530 /*
1531 * Include the link-layer header.
1532 */
1533 hex_print("\n\t", sp, h->caplen);
1534 } else {
1535 /*
1536 * Don't include the link-layer header - and if
1537 * we have nothing past the link-layer header,
1538 * print nothing.
1539 */
1540 if (h->caplen > hdrlen)
1541 hex_print("\n\t", sp + hdrlen,
1542 h->caplen - hdrlen);
1543 }
1544 } else if (Aflag) {
1545 /*
1546 * Print the raw packet data in ASCII.
1547 */
1548 if (Aflag > 1) {
1549 /*
1550 * Include the link-layer header.
1551 */
1552 ascii_print(sp, h->caplen);
1553 } else {
1554 /*
1555 * Don't include the link-layer header - and if
1556 * we have nothing past the link-layer header,
1557 * print nothing.
1558 */
1559 if (h->caplen > hdrlen)
1560 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1561 }
1562 }
1563
1564 putchar('\n');
1565
1566 --infodelay;
1567 if (infoprint)
1568 info(0);
1569}
1570
1571#ifdef WIN32
1572 /*
1573 * XXX - there should really be libpcap calls to get the version
1574 * number as a string (the string would be generated from #defines
1575 * at run time, so that it's not generated from string constants
1576 * in the library, as, on many UNIX systems, those constants would
1577 * be statically linked into the application executable image, and
1578 * would thus reflect the version of libpcap on the system on
1579 * which the application was *linked*, not the system on which it's
1580 * *running*.
1581 *
1582 * That routine should be documented, unlike the "version[]"
1583 * string, so that UNIX vendors providing their own libpcaps
1584 * don't omit it (as a couple of vendors have...).
1585 *
1586 * Packet.dll should perhaps also export a routine to return the
1587 * version number of the Packet.dll code, to supply the
1588 * "Wpcap_version" information on Windows.
1589 */
1590 char WDversion[]="current-cvs.tcpdump.org";
1591#if !defined(HAVE_GENERATED_VERSION)
1592 char version[]="current-cvs.tcpdump.org";
1593#endif
1594 char pcap_version[]="current-cvs.tcpdump.org";
1595 char Wpcap_version[]="3.1";
1596#endif
1597
1598/*
1599 * By default, print the specified data out in hex and ASCII.
1600 */
1601static void
1602ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1603{
1604 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1605}
1606
1607void
1608default_print(const u_char *bp, u_int length)
1609{
1610 ndo_default_print(gndo, bp, length);
1611}
1612
1613#ifdef SIGINFO
1614RETSIGTYPE requestinfo(int signo _U_)
1615{
1616 if (infodelay)
1617 ++infoprint;
1618 else
1619 info(0);
1620}
1621#endif
1622
1623/*
1624 * Called once each second in verbose mode while dumping to file
1625 */
1626#ifdef USE_WIN32_MM_TIMER
1627void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
ea7b4bf5 1628 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
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1629{
1630 struct pcap_stat stat;
1631
1632 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1633 fprintf(stderr, "Got %u\r", packets_captured);
1634}
1635#elif defined(HAVE_ALARM)
1636static void verbose_stats_dump(int sig _U_)
1637{
1638 struct pcap_stat stat;
1639
1640 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1641 fprintf(stderr, "Got %u\r", packets_captured);
1642 alarm(1);
1643}
1644#endif
1645
1646static void
1647usage(void)
1648{
1649 extern char version[];
1650#ifndef HAVE_PCAP_LIB_VERSION
1651#if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1652 extern char pcap_version[];
1653#else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1654 static char pcap_version[] = "unknown";
1655#endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1656#endif /* HAVE_PCAP_LIB_VERSION */
1657
1658#ifdef HAVE_PCAP_LIB_VERSION
1659#ifdef WIN32
1660 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1661#else /* WIN32 */
1662 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1663#endif /* WIN32 */
1664 (void)fprintf(stderr, "%s\n",pcap_lib_version());
1665#else /* HAVE_PCAP_LIB_VERSION */
1666#ifdef WIN32
1667 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1668 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1669#else /* WIN32 */
1670 (void)fprintf(stderr, "%s version %s\n", program_name, version);
1671 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1672#endif /* WIN32 */
1673#endif /* HAVE_PCAP_LIB_VERSION */
1674 (void)fprintf(stderr,
ea7b4bf5
PA
1675"Usage: %s [-aAd" D_FLAG "ef" I_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1676 (void)fprintf(stderr,
1677"\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
c8cf0f94 1678 (void)fprintf(stderr,
ea7b4bf5 1679"\t\t[ -i interface ] [ -M secret ] [ -r file ]\n");
c8cf0f94 1680 (void)fprintf(stderr,
ea7b4bf5 1681"\t\t[ -s snaplen ] [ -T type ] [ -w file ] [ -W filecount ]\n");
c8cf0f94 1682 (void)fprintf(stderr,
ea7b4bf5 1683"\t\t[ -y datalinktype ] [ -z command ] [ -Z user ]\n");
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PA
1684 (void)fprintf(stderr,
1685"\t\t[ expression ]\n");
1686 exit(1);
1687}
1688
1689
1690
1691/* VARARGS */
1692static void
1693ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1694{
1695 va_list ap;
1696
1697 (void)fprintf(stderr, "%s: ", program_name);
1698 va_start(ap, fmt);
1699 (void)vfprintf(stderr, fmt, ap);
1700 va_end(ap);
1701 if (*fmt) {
1702 fmt += strlen(fmt);
1703 if (fmt[-1] != '\n')
1704 (void)fputc('\n', stderr);
1705 }
1706 exit(1);
1707 /* NOTREACHED */
1708}
1709
1710/* VARARGS */
1711static void
1712ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1713{
1714 va_list ap;
1715
1716 (void)fprintf(stderr, "%s: WARNING: ", program_name);
1717 va_start(ap, fmt);
1718 (void)vfprintf(stderr, fmt, ap);
1719 va_end(ap);
1720 if (*fmt) {
1721 fmt += strlen(fmt);
1722 if (fmt[-1] != '\n')
1723 (void)fputc('\n', stderr);
1724 }
1725}