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Use the length field in the UDP header.
[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 /* capabilities convinience library */
78 #ifdef HAVE_CAP_NG_H
79 #include <cap-ng.h>
80 #endif /* HAVE_CAP_NG_H */
81
82 #include "netdissect.h"
83 #include "interface.h"
84 #include "addrtoname.h"
85 #include "machdep.h"
86 #include "setsignal.h"
87 #include "gmt2local.h"
88 #include "pcap-missing.h"
89
90 #ifndef PATH_MAX
91 #define PATH_MAX 1024
92 #endif
93
94 #ifdef SIGINFO
95 #define SIGNAL_REQ_INFO SIGINFO
96 #elif SIGUSR1
97 #define SIGNAL_REQ_INFO SIGUSR1
98 #endif
99
100 netdissect_options Gndo;
101 netdissect_options *gndo = &Gndo;
102
103 static int dflag; /* print filter code */
104 static int Lflag; /* list available data link types and exit */
105 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
106 static int Jflag; /* list available time stamp types */
107 #endif
108 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
109
110 static int infodelay;
111 static int infoprint;
112
113 char *program_name;
114
115 int32_t thiszone; /* seconds offset from gmt to local time */
116
117 /* Forwards */
118 static RETSIGTYPE cleanup(int);
119 static RETSIGTYPE child_cleanup(int);
120 static void usage(void) __attribute__((noreturn));
121 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
122
123 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
124 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
125 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
126 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
127 static void droproot(const char *, const char *);
128 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
129 __attribute__ ((noreturn, format (printf, 2, 3)));
130 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
131
132 #ifdef SIGNAL_REQ_INFO
133 RETSIGTYPE requestinfo(int);
134 #endif
135
136 #if defined(USE_WIN32_MM_TIMER)
137 #include <MMsystem.h>
138 static UINT timer_id;
139 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
140 #elif defined(HAVE_ALARM)
141 static void verbose_stats_dump(int sig);
142 #endif
143
144 static void info(int);
145 static u_int packets_captured;
146
147 struct printer {
148 if_printer f;
149 int type;
150 };
151
152
153 struct ndo_printer {
154 if_ndo_printer f;
155 int type;
156 };
157
158
159 static struct printer printers[] = {
160 { arcnet_if_print, DLT_ARCNET },
161 #ifdef DLT_ARCNET_LINUX
162 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
163 #endif
164 { token_if_print, DLT_IEEE802 },
165 #ifdef DLT_LANE8023
166 { lane_if_print, DLT_LANE8023 },
167 #endif
168 #ifdef DLT_CIP
169 { cip_if_print, DLT_CIP },
170 #endif
171 #ifdef DLT_ATM_CLIP
172 { cip_if_print, DLT_ATM_CLIP },
173 #endif
174 { sl_if_print, DLT_SLIP },
175 #ifdef DLT_SLIP_BSDOS
176 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
177 #endif
178 { ppp_if_print, DLT_PPP },
179 #ifdef DLT_PPP_WITHDIRECTION
180 { ppp_if_print, DLT_PPP_WITHDIRECTION },
181 #endif
182 #ifdef DLT_PPP_BSDOS
183 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
184 #endif
185 { fddi_if_print, DLT_FDDI },
186 { null_if_print, DLT_NULL },
187 #ifdef DLT_LOOP
188 { null_if_print, DLT_LOOP },
189 #endif
190 { raw_if_print, DLT_RAW },
191 { atm_if_print, DLT_ATM_RFC1483 },
192 #ifdef DLT_C_HDLC
193 { chdlc_if_print, DLT_C_HDLC },
194 #endif
195 #ifdef DLT_HDLC
196 { chdlc_if_print, DLT_HDLC },
197 #endif
198 #ifdef DLT_PPP_SERIAL
199 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
200 #endif
201 #ifdef DLT_PPP_ETHER
202 { pppoe_if_print, DLT_PPP_ETHER },
203 #endif
204 #ifdef DLT_LINUX_SLL
205 { sll_if_print, DLT_LINUX_SLL },
206 #endif
207 #ifdef DLT_IEEE802_11
208 { ieee802_11_if_print, DLT_IEEE802_11},
209 #endif
210 #ifdef DLT_LTALK
211 { ltalk_if_print, DLT_LTALK },
212 #endif
213 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
214 { pflog_if_print, DLT_PFLOG },
215 #endif
216 #ifdef DLT_FR
217 { fr_if_print, DLT_FR },
218 #endif
219 #ifdef DLT_FRELAY
220 { fr_if_print, DLT_FRELAY },
221 #endif
222 #ifdef DLT_SUNATM
223 { sunatm_if_print, DLT_SUNATM },
224 #endif
225 #ifdef DLT_IP_OVER_FC
226 { ipfc_if_print, DLT_IP_OVER_FC },
227 #endif
228 #ifdef DLT_PRISM_HEADER
229 { prism_if_print, DLT_PRISM_HEADER },
230 #endif
231 #ifdef DLT_IEEE802_11_RADIO
232 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
233 #endif
234 #ifdef DLT_ENC
235 { enc_if_print, DLT_ENC },
236 #endif
237 #ifdef DLT_SYMANTEC_FIREWALL
238 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
239 #endif
240 #ifdef DLT_APPLE_IP_OVER_IEEE1394
241 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
242 #endif
243 #ifdef DLT_IEEE802_11_RADIO_AVS
244 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
245 #endif
246 #ifdef DLT_JUNIPER_ATM1
247 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
248 #endif
249 #ifdef DLT_JUNIPER_ATM2
250 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
251 #endif
252 #ifdef DLT_JUNIPER_MFR
253 { juniper_mfr_print, DLT_JUNIPER_MFR },
254 #endif
255 #ifdef DLT_JUNIPER_MLFR
256 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
257 #endif
258 #ifdef DLT_JUNIPER_MLPPP
259 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
260 #endif
261 #ifdef DLT_JUNIPER_PPPOE
262 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
263 #endif
264 #ifdef DLT_JUNIPER_PPPOE_ATM
265 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
266 #endif
267 #ifdef DLT_JUNIPER_GGSN
268 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
269 #endif
270 #ifdef DLT_JUNIPER_ES
271 { juniper_es_print, DLT_JUNIPER_ES },
272 #endif
273 #ifdef DLT_JUNIPER_MONITOR
274 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
275 #endif
276 #ifdef DLT_JUNIPER_SERVICES
277 { juniper_services_print, DLT_JUNIPER_SERVICES },
278 #endif
279 #ifdef DLT_JUNIPER_ETHER
280 { juniper_ether_print, DLT_JUNIPER_ETHER },
281 #endif
282 #ifdef DLT_JUNIPER_PPP
283 { juniper_ppp_print, DLT_JUNIPER_PPP },
284 #endif
285 #ifdef DLT_JUNIPER_FRELAY
286 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
287 #endif
288 #ifdef DLT_JUNIPER_CHDLC
289 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
290 #endif
291 #ifdef DLT_MFR
292 { mfr_if_print, DLT_MFR },
293 #endif
294 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
295 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
296 #endif
297 #ifdef HAVE_PCAP_USB_H
298 #ifdef DLT_USB_LINUX
299 { usb_linux_48_byte_print, DLT_USB_LINUX},
300 #endif /* DLT_USB_LINUX */
301 #ifdef DLT_USB_LINUX_MMAPPED
302 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
303 #endif /* DLT_USB_LINUX_MMAPPED */
304 #endif /* HAVE_PCAP_USB_H */
305 #ifdef DLT_IPV4
306 { raw_if_print, DLT_IPV4 },
307 #endif
308 #ifdef DLT_IPV6
309 { raw_if_print, DLT_IPV6 },
310 #endif
311 { NULL, 0 },
312 };
313
314 static struct ndo_printer ndo_printers[] = {
315 { ether_if_print, DLT_EN10MB },
316 #ifdef DLT_IPNET
317 { ipnet_if_print, DLT_IPNET },
318 #endif
319 #ifdef DLT_IEEE802_15_4
320 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
321 #endif
322 #ifdef DLT_IEEE802_15_4_NOFCS
323 { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
324 #endif
325 #ifdef DLT_PPI
326 { ppi_if_print, DLT_PPI },
327 #endif
328 #ifdef DLT_NETANALYZER
329 { netanalyzer_if_print, DLT_NETANALYZER },
330 #endif
331 #ifdef DLT_NETANALYZER_TRANSPARENT
332 { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
333 #endif
334 { NULL, 0 },
335 };
336
337 if_printer
338 lookup_printer(int type)
339 {
340 struct printer *p;
341
342 for (p = printers; p->f; ++p)
343 if (type == p->type)
344 return p->f;
345
346 return NULL;
347 /* NOTREACHED */
348 }
349
350 if_ndo_printer
351 lookup_ndo_printer(int type)
352 {
353 struct ndo_printer *p;
354
355 for (p = ndo_printers; p->f; ++p)
356 if (type == p->type)
357 return p->f;
358
359 return NULL;
360 /* NOTREACHED */
361 }
362
363 static pcap_t *pd;
364
365 static int supports_monitor_mode;
366
367 extern int optind;
368 extern int opterr;
369 extern char *optarg;
370
371 struct print_info {
372 netdissect_options *ndo;
373 union {
374 if_printer printer;
375 if_ndo_printer ndo_printer;
376 } p;
377 int ndo_type;
378 };
379
380 struct dump_info {
381 char *WFileName;
382 char *CurrentFileName;
383 pcap_t *pd;
384 pcap_dumper_t *p;
385 };
386
387 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
388 static void
389 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
390 {
391 int n_tstamp_types;
392 int *tstamp_types = 0;
393 const char *tstamp_type_name;
394 int i;
395
396 n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
397 if (n_tstamp_types < 0)
398 error("%s", pcap_geterr(pd));
399
400 if (n_tstamp_types == 0) {
401 fprintf(stderr, "Time stamp type cannot be set for %s\n",
402 device);
403 exit(0);
404 }
405 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
406 device);
407 for (i = 0; i < n_tstamp_types; i++) {
408 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
409 if (tstamp_type_name != NULL) {
410 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
411 pcap_tstamp_type_val_to_description(tstamp_types[i]));
412 } else {
413 (void) fprintf(stderr, " %d\n", tstamp_types[i]);
414 }
415 }
416 pcap_free_tstamp_types(tstamp_types);
417 exit(0);
418 }
419 #endif
420
421 static void
422 show_dlts_and_exit(const char *device, pcap_t *pd)
423 {
424 int n_dlts;
425 int *dlts = 0;
426 const char *dlt_name;
427
428 n_dlts = pcap_list_datalinks(pd, &dlts);
429 if (n_dlts < 0)
430 error("%s", pcap_geterr(pd));
431 else if (n_dlts == 0 || !dlts)
432 error("No data link types.");
433
434 /*
435 * If the interface is known to support monitor mode, indicate
436 * whether these are the data link types available when not in
437 * monitor mode, if -I wasn't specified, or when in monitor mode,
438 * when -I was specified (the link-layer types available in
439 * monitor mode might be different from the ones available when
440 * not in monitor mode).
441 */
442 if (supports_monitor_mode)
443 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
444 device,
445 Iflag ? "when in monitor mode" : "when not in monitor mode");
446 else
447 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
448 device);
449
450 while (--n_dlts >= 0) {
451 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
452 if (dlt_name != NULL) {
453 (void) fprintf(stderr, " %s (%s)", dlt_name,
454 pcap_datalink_val_to_description(dlts[n_dlts]));
455
456 /*
457 * OK, does tcpdump handle that type?
458 */
459 if (lookup_printer(dlts[n_dlts]) == NULL
460 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
461 (void) fprintf(stderr, " (printing not supported)");
462 fprintf(stderr, "\n");
463 } else {
464 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
465 dlts[n_dlts]);
466 }
467 }
468 #ifdef HAVE_PCAP_FREE_DATALINKS
469 pcap_free_datalinks(dlts);
470 #endif
471 exit(0);
472 }
473
474 /*
475 * Set up flags that might or might not be supported depending on the
476 * version of libpcap we're using.
477 */
478 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
479 #define B_FLAG "B:"
480 #define B_FLAG_USAGE " [ -B size ]"
481 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
482 #define B_FLAG
483 #define B_FLAG_USAGE
484 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
485
486 #ifdef HAVE_PCAP_CREATE
487 #define I_FLAG "I"
488 #else /* HAVE_PCAP_CREATE */
489 #define I_FLAG
490 #endif /* HAVE_PCAP_CREATE */
491
492 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
493 #define j_FLAG "j:"
494 #define j_FLAG_USAGE " [ -j tstamptype ]"
495 #define J_FLAG "J"
496 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
497 #define j_FLAG
498 #define j_FLAG_USAGE
499 #define J_FLAG
500 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
501
502 #ifdef HAVE_PCAP_FINDALLDEVS
503 #ifndef HAVE_PCAP_IF_T
504 #undef HAVE_PCAP_FINDALLDEVS
505 #endif
506 #endif
507
508 #ifdef HAVE_PCAP_FINDALLDEVS
509 #define D_FLAG "D"
510 #else
511 #define D_FLAG
512 #endif
513
514 #ifdef HAVE_PCAP_DUMP_FLUSH
515 #define U_FLAG "U"
516 #else
517 #define U_FLAG
518 #endif
519
520 #ifndef WIN32
521 /* Drop root privileges and chroot if necessary */
522 static void
523 droproot(const char *username, const char *chroot_dir)
524 {
525 struct passwd *pw = NULL;
526
527 if (chroot_dir && !username) {
528 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
529 exit(1);
530 }
531
532 pw = getpwnam(username);
533 if (pw) {
534 if (chroot_dir) {
535 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
536 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
537 chroot_dir, pcap_strerror(errno));
538 exit(1);
539 }
540 }
541 #ifdef HAVE_CAP_NG_H
542 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
543 if (ret < 0) {
544 printf("error : ret %d\n", ret);
545 }
546 /* We don't need CAP_SETUID and CAP_SETGID */
547 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
548 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
549 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
550 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
551 capng_apply(CAPNG_SELECT_BOTH);
552
553 #else
554 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
555 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
556 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
557 username,
558 (unsigned long)pw->pw_uid,
559 (unsigned long)pw->pw_gid,
560 pcap_strerror(errno));
561 exit(1);
562 }
563 #endif /* HAVE_CAP_NG_H */
564 }
565 else {
566 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
567 username);
568 exit(1);
569 }
570 }
571 #endif /* WIN32 */
572
573 static int
574 getWflagChars(int x)
575 {
576 int c = 0;
577
578 x -= 1;
579 while (x > 0) {
580 c += 1;
581 x /= 10;
582 }
583
584 return c;
585 }
586
587
588 static void
589 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
590 {
591 char *filename = malloc(PATH_MAX + 1);
592 if (filename == NULL)
593 error("Makefilename: malloc");
594
595 /* Process with strftime if Gflag is set. */
596 if (Gflag != 0) {
597 struct tm *local_tm;
598
599 /* Convert Gflag_time to a usable format */
600 if ((local_tm = localtime(&Gflag_time)) == NULL) {
601 error("MakeTimedFilename: localtime");
602 }
603
604 /* There's no good way to detect an error in strftime since a return
605 * value of 0 isn't necessarily failure.
606 */
607 strftime(filename, PATH_MAX, orig_name, local_tm);
608 } else {
609 strncpy(filename, orig_name, PATH_MAX);
610 }
611
612 if (cnt == 0 && max_chars == 0)
613 strncpy(buffer, filename, PATH_MAX + 1);
614 else
615 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
616 /* Report an error if the filename is too large */
617 error("too many output files or filename is too long (> %d)", PATH_MAX);
618 free(filename);
619 }
620
621 static int tcpdump_printf(netdissect_options *ndo _U_,
622 const char *fmt, ...)
623 {
624
625 va_list args;
626 int ret;
627
628 va_start(args, fmt);
629 ret=vfprintf(stdout, fmt, args);
630 va_end(args);
631
632 return ret;
633 }
634
635 static struct print_info
636 get_print_info(int type)
637 {
638 struct print_info printinfo;
639
640 printinfo.ndo_type = 1;
641 printinfo.ndo = gndo;
642 printinfo.p.ndo_printer = lookup_ndo_printer(type);
643 if (printinfo.p.ndo_printer == NULL) {
644 printinfo.p.printer = lookup_printer(type);
645 printinfo.ndo_type = 0;
646 if (printinfo.p.printer == NULL) {
647 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
648 if (gndo->ndo_dltname != NULL)
649 error("packet printing is not supported for link type %s: use -w",
650 gndo->ndo_dltname);
651 else
652 error("packet printing is not supported for link type %d: use -w", type);
653 }
654 }
655 return (printinfo);
656 }
657
658 static char *
659 get_next_file(FILE *VFile, char *ptr)
660 {
661 char *ret;
662
663 ret = fgets(ptr, PATH_MAX, VFile);
664 if (!ret)
665 return NULL;
666
667 if (ptr[strlen(ptr) - 1] == '\n')
668 ptr[strlen(ptr) - 1] = '\0';
669
670 return ret;
671 }
672
673 int
674 main(int argc, char **argv)
675 {
676 register int cnt, op, i;
677 bpf_u_int32 localnet, netmask;
678 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
679 pcap_handler callback;
680 int type;
681 int dlt;
682 int new_dlt;
683 const char *dlt_name;
684 struct bpf_program fcode;
685 #ifndef WIN32
686 RETSIGTYPE (*oldhandler)(int);
687 #endif
688 struct print_info printinfo;
689 struct dump_info dumpinfo;
690 u_char *pcap_userdata;
691 char ebuf[PCAP_ERRBUF_SIZE];
692 char VFileLine[PATH_MAX + 1];
693 char *username = NULL;
694 char *chroot_dir = NULL;
695 char *ret = NULL;
696 char *end;
697 #ifdef HAVE_PCAP_FINDALLDEVS
698 pcap_if_t *devpointer;
699 int devnum;
700 #endif
701 int status;
702 FILE *VFile;
703 #ifdef WIN32
704 if(wsockinit() != 0) return 1;
705 #endif /* WIN32 */
706
707 jflag=-1; /* not set */
708 gndo->ndo_Oflag=1;
709 gndo->ndo_Rflag=1;
710 gndo->ndo_dlt=-1;
711 gndo->ndo_default_print=ndo_default_print;
712 gndo->ndo_printf=tcpdump_printf;
713 gndo->ndo_error=ndo_error;
714 gndo->ndo_warning=ndo_warning;
715 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
716
717 cnt = -1;
718 device = NULL;
719 infile = NULL;
720 RFileName = NULL;
721 VFileName = NULL;
722 VFile = NULL;
723 WFileName = NULL;
724 dlt = -1;
725 if ((cp = strrchr(argv[0], '/')) != NULL)
726 program_name = cp + 1;
727 else
728 program_name = argv[0];
729
730 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
731 error("%s", ebuf);
732
733 #ifdef LIBSMI
734 smiInit("tcpdump");
735 #endif
736
737 while (
738 (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "V:vw:W:xXy:Yz:Z:")) != -1)
739 switch (op) {
740
741 case 'a':
742 /* compatibility for old -a */
743 break;
744
745 case 'A':
746 ++Aflag;
747 break;
748
749 case 'b':
750 ++bflag;
751 break;
752
753 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
754 case 'B':
755 Bflag = atoi(optarg)*1024;
756 if (Bflag <= 0)
757 error("invalid packet buffer size %s", optarg);
758 break;
759 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
760
761 case 'c':
762 cnt = atoi(optarg);
763 if (cnt <= 0)
764 error("invalid packet count %s", optarg);
765 break;
766
767 case 'C':
768 Cflag = atoi(optarg) * 1000000;
769 if (Cflag < 0)
770 error("invalid file size %s", optarg);
771 break;
772
773 case 'd':
774 ++dflag;
775 break;
776
777 #ifdef HAVE_PCAP_FINDALLDEVS
778 case 'D':
779 if (pcap_findalldevs(&devpointer, ebuf) < 0)
780 error("%s", ebuf);
781 else {
782 for (i = 0; devpointer != 0; i++) {
783 printf("%d.%s", i+1, devpointer->name);
784 if (devpointer->description != NULL)
785 printf(" (%s)", devpointer->description);
786 printf("\n");
787 devpointer = devpointer->next;
788 }
789 }
790 return 0;
791 #endif /* HAVE_PCAP_FINDALLDEVS */
792
793 case 'L':
794 Lflag++;
795 break;
796
797 case 'e':
798 ++eflag;
799 break;
800
801 case 'E':
802 #ifndef HAVE_LIBCRYPTO
803 warning("crypto code not compiled in");
804 #endif
805 gndo->ndo_espsecret = optarg;
806 break;
807
808 case 'f':
809 ++fflag;
810 break;
811
812 case 'F':
813 infile = optarg;
814 break;
815
816 case 'G':
817 Gflag = atoi(optarg);
818 if (Gflag < 0)
819 error("invalid number of seconds %s", optarg);
820
821 /* We will create one file initially. */
822 Gflag_count = 0;
823
824 /* Grab the current time for rotation use. */
825 if ((Gflag_time = time(NULL)) == (time_t)-1) {
826 error("main: can't get current time: %s",
827 pcap_strerror(errno));
828 }
829 break;
830
831 case 'h':
832 usage();
833 break;
834
835 case 'H':
836 ++Hflag;
837 break;
838
839 case 'i':
840 if (optarg[0] == '0' && optarg[1] == 0)
841 error("Invalid adapter index");
842
843 #ifdef HAVE_PCAP_FINDALLDEVS
844 /*
845 * If the argument is a number, treat it as
846 * an index into the list of adapters, as
847 * printed by "tcpdump -D".
848 *
849 * This should be OK on UNIX systems, as interfaces
850 * shouldn't have names that begin with digits.
851 * It can be useful on Windows, where more than
852 * one interface can have the same name.
853 */
854 devnum = strtol(optarg, &end, 10);
855 if (optarg != end && *end == '\0') {
856 if (devnum < 0)
857 error("Invalid adapter index");
858
859 if (pcap_findalldevs(&devpointer, ebuf) < 0)
860 error("%s", ebuf);
861 else {
862 /*
863 * Look for the devnum-th entry
864 * in the list of devices
865 * (1-based).
866 */
867 for (i = 0;
868 i < devnum-1 && devpointer != NULL;
869 i++, devpointer = devpointer->next)
870 ;
871 if (devpointer == NULL)
872 error("Invalid adapter index");
873 }
874 device = devpointer->name;
875 break;
876 }
877 #endif /* HAVE_PCAP_FINDALLDEVS */
878 device = optarg;
879 break;
880
881 #ifdef HAVE_PCAP_CREATE
882 case 'I':
883 ++Iflag;
884 break;
885 #endif /* HAVE_PCAP_CREATE */
886
887 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
888 case 'j':
889 jflag = pcap_tstamp_type_name_to_val(optarg);
890 if (jflag < 0)
891 error("invalid time stamp type %s", optarg);
892 break;
893
894 case 'J':
895 Jflag++;
896 break;
897 #endif
898
899 case 'l':
900 #ifdef WIN32
901 /*
902 * _IOLBF is the same as _IOFBF in Microsoft's C
903 * libraries; the only alternative they offer
904 * is _IONBF.
905 *
906 * XXX - this should really be checking for MSVC++,
907 * not WIN32, if, for example, MinGW has its own
908 * C library that is more UNIX-compatible.
909 */
910 setvbuf(stdout, NULL, _IONBF, 0);
911 #else /* WIN32 */
912 #ifdef HAVE_SETLINEBUF
913 setlinebuf(stdout);
914 #else
915 setvbuf(stdout, NULL, _IOLBF, 0);
916 #endif
917 #endif /* WIN32 */
918 break;
919
920 case 'K':
921 ++Kflag;
922 break;
923
924 case 'm':
925 #ifdef LIBSMI
926 if (smiLoadModule(optarg) == 0) {
927 error("could not load MIB module %s", optarg);
928 }
929 sflag = 1;
930 #else
931 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
932 program_name, optarg);
933 (void)fprintf(stderr, "(no libsmi support)\n");
934 #endif
935 break;
936
937 case 'M':
938 /* TCP-MD5 shared secret */
939 #ifndef HAVE_LIBCRYPTO
940 warning("crypto code not compiled in");
941 #endif
942 sigsecret = optarg;
943 break;
944
945 case 'n':
946 ++nflag;
947 break;
948
949 case 'N':
950 ++Nflag;
951 break;
952
953 case 'O':
954 Oflag = 0;
955 break;
956
957 case 'p':
958 ++pflag;
959 break;
960
961 case 'q':
962 ++qflag;
963 ++suppress_default_print;
964 break;
965
966 case 'r':
967 RFileName = optarg;
968 break;
969
970 case 'R':
971 Rflag = 0;
972 break;
973
974 case 's':
975 snaplen = strtol(optarg, &end, 0);
976 if (optarg == end || *end != '\0'
977 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
978 error("invalid snaplen %s", optarg);
979 else if (snaplen == 0)
980 snaplen = MAXIMUM_SNAPLEN;
981 break;
982
983 case 'S':
984 ++Sflag;
985 break;
986
987 case 't':
988 ++tflag;
989 break;
990
991 case 'T':
992 if (strcasecmp(optarg, "vat") == 0)
993 packettype = PT_VAT;
994 else if (strcasecmp(optarg, "wb") == 0)
995 packettype = PT_WB;
996 else if (strcasecmp(optarg, "rpc") == 0)
997 packettype = PT_RPC;
998 else if (strcasecmp(optarg, "rtp") == 0)
999 packettype = PT_RTP;
1000 else if (strcasecmp(optarg, "rtcp") == 0)
1001 packettype = PT_RTCP;
1002 else if (strcasecmp(optarg, "snmp") == 0)
1003 packettype = PT_SNMP;
1004 else if (strcasecmp(optarg, "cnfp") == 0)
1005 packettype = PT_CNFP;
1006 else if (strcasecmp(optarg, "tftp") == 0)
1007 packettype = PT_TFTP;
1008 else if (strcasecmp(optarg, "aodv") == 0)
1009 packettype = PT_AODV;
1010 else if (strcasecmp(optarg, "carp") == 0)
1011 packettype = PT_CARP;
1012 else if (strcasecmp(optarg, "radius") == 0)
1013 packettype = PT_RADIUS;
1014 else if (strcasecmp(optarg, "zmtp1") == 0)
1015 packettype = PT_ZMTP1;
1016 else if (strcasecmp(optarg, "vxlan") == 0)
1017 packettype = PT_VXLAN;
1018 else if (strcasecmp(optarg, "pgm") == 0)
1019 packettype = PT_PGM;
1020 else if (strcasecmp(optarg, "pgm_zmtp1") == 0)
1021 packettype = PT_PGM_ZMTP1;
1022 else
1023 error("unknown packet type `%s'", optarg);
1024 break;
1025
1026 case 'u':
1027 ++uflag;
1028 break;
1029
1030 #ifdef HAVE_PCAP_DUMP_FLUSH
1031 case 'U':
1032 ++Uflag;
1033 break;
1034 #endif
1035
1036 case 'v':
1037 ++vflag;
1038 break;
1039
1040 case 'V':
1041 VFileName = optarg;
1042 break;
1043
1044 case 'w':
1045 WFileName = optarg;
1046 break;
1047
1048 case 'W':
1049 Wflag = atoi(optarg);
1050 if (Wflag < 0)
1051 error("invalid number of output files %s", optarg);
1052 WflagChars = getWflagChars(Wflag);
1053 break;
1054
1055 case 'x':
1056 ++xflag;
1057 ++suppress_default_print;
1058 break;
1059
1060 case 'X':
1061 ++Xflag;
1062 ++suppress_default_print;
1063 break;
1064
1065 case 'y':
1066 gndo->ndo_dltname = optarg;
1067 gndo->ndo_dlt =
1068 pcap_datalink_name_to_val(gndo->ndo_dltname);
1069 if (gndo->ndo_dlt < 0)
1070 error("invalid data link type %s", gndo->ndo_dltname);
1071 break;
1072
1073 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1074 case 'Y':
1075 {
1076 /* Undocumented flag */
1077 #ifdef HAVE_PCAP_DEBUG
1078 extern int pcap_debug;
1079 pcap_debug = 1;
1080 #else
1081 extern int yydebug;
1082 yydebug = 1;
1083 #endif
1084 }
1085 break;
1086 #endif
1087 case 'z':
1088 if (optarg) {
1089 zflag = strdup(optarg);
1090 } else {
1091 usage();
1092 /* NOTREACHED */
1093 }
1094 break;
1095
1096 case 'Z':
1097 if (optarg) {
1098 username = strdup(optarg);
1099 }
1100 else {
1101 usage();
1102 /* NOTREACHED */
1103 }
1104 break;
1105
1106 default:
1107 usage();
1108 /* NOTREACHED */
1109 }
1110
1111 switch (tflag) {
1112
1113 case 0: /* Default */
1114 case 4: /* Default + Date*/
1115 thiszone = gmt2local(0);
1116 break;
1117
1118 case 1: /* No time stamp */
1119 case 2: /* Unix timeval style */
1120 case 3: /* Microseconds since previous packet */
1121 case 5: /* Microseconds since first packet */
1122 break;
1123
1124 default: /* Not supported */
1125 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1126 break;
1127 }
1128
1129 if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1130 error("-f can not be used with -V or -r");
1131
1132 if (VFileName != NULL && RFileName != NULL)
1133 error("-V and -r are mutually exclusive.");
1134
1135 #ifdef WITH_CHROOT
1136 /* if run as root, prepare for chrooting */
1137 if (getuid() == 0 || geteuid() == 0) {
1138 /* future extensibility for cmd-line arguments */
1139 if (!chroot_dir)
1140 chroot_dir = WITH_CHROOT;
1141 }
1142 #endif
1143
1144 #ifdef WITH_USER
1145 /* if run as root, prepare for dropping root privileges */
1146 if (getuid() == 0 || geteuid() == 0) {
1147 /* Run with '-Z root' to restore old behaviour */
1148 if (!username)
1149 username = WITH_USER;
1150 }
1151 #endif
1152
1153 if (RFileName != NULL || VFileName != NULL) {
1154 /*
1155 * If RFileName is non-null, it's the pathname of a
1156 * savefile to read. If VFileName is non-null, it's
1157 * the pathname of a file containing a list of pathnames
1158 * (one per line) of savefiles to read.
1159 *
1160 * In either case, we're reading a savefile, not doing
1161 * a live capture.
1162 */
1163 #ifndef WIN32
1164 /*
1165 * We don't need network access, so relinquish any set-UID
1166 * or set-GID privileges we have (if any).
1167 *
1168 * We do *not* want set-UID privileges when opening a
1169 * trace file, as that might let the user read other
1170 * people's trace files (especially if we're set-UID
1171 * root).
1172 */
1173 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1174 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1175 #endif /* WIN32 */
1176 if (VFileName != NULL) {
1177 if (VFileName[0] == '-' && VFileName[1] == '\0')
1178 VFile = stdin;
1179 else
1180 VFile = fopen(VFileName, "r");
1181
1182 if (VFile == NULL)
1183 error("Unable to open file: %s\n", strerror(errno));
1184
1185 ret = get_next_file(VFile, VFileLine);
1186 if (!ret)
1187 error("Nothing in %s\n", VFileName);
1188 RFileName = VFileLine;
1189 }
1190
1191 pd = pcap_open_offline(RFileName, ebuf);
1192 if (pd == NULL)
1193 error("%s", ebuf);
1194 dlt = pcap_datalink(pd);
1195 dlt_name = pcap_datalink_val_to_name(dlt);
1196 if (dlt_name == NULL) {
1197 fprintf(stderr, "reading from file %s, link-type %u\n",
1198 RFileName, dlt);
1199 } else {
1200 fprintf(stderr,
1201 "reading from file %s, link-type %s (%s)\n",
1202 RFileName, dlt_name,
1203 pcap_datalink_val_to_description(dlt));
1204 }
1205 localnet = 0;
1206 netmask = 0;
1207 } else {
1208 /*
1209 * We're doing a live capture.
1210 */
1211 if (device == NULL) {
1212 device = pcap_lookupdev(ebuf);
1213 if (device == NULL)
1214 error("%s", ebuf);
1215 }
1216 #ifdef WIN32
1217 /*
1218 * Print a message to the standard error on Windows.
1219 * XXX - why do it here, with a different message?
1220 */
1221 if(strlen(device) == 1) /* we assume that an ASCII string is always longer than 1 char */
1222 { /* a Unicode string has a \0 as second byte (so strlen() is 1) */
1223 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1224 }
1225 else
1226 {
1227 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1228 }
1229
1230 fflush(stderr);
1231 #endif /* WIN32 */
1232 #ifdef HAVE_PCAP_CREATE
1233 pd = pcap_create(device, ebuf);
1234 if (pd == NULL)
1235 error("%s", ebuf);
1236 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1237 if (Jflag)
1238 show_tstamp_types_and_exit(device, pd);
1239 #endif
1240 /*
1241 * Is this an interface that supports monitor mode?
1242 */
1243 if (pcap_can_set_rfmon(pd) == 1)
1244 supports_monitor_mode = 1;
1245 else
1246 supports_monitor_mode = 0;
1247 status = pcap_set_snaplen(pd, snaplen);
1248 if (status != 0)
1249 error("%s: Can't set snapshot length: %s",
1250 device, pcap_statustostr(status));
1251 status = pcap_set_promisc(pd, !pflag);
1252 if (status != 0)
1253 error("%s: Can't set promiscuous mode: %s",
1254 device, pcap_statustostr(status));
1255 if (Iflag) {
1256 status = pcap_set_rfmon(pd, 1);
1257 if (status != 0)
1258 error("%s: Can't set monitor mode: %s",
1259 device, pcap_statustostr(status));
1260 }
1261 status = pcap_set_timeout(pd, 1000);
1262 if (status != 0)
1263 error("%s: pcap_set_timeout failed: %s",
1264 device, pcap_statustostr(status));
1265 if (Bflag != 0) {
1266 status = pcap_set_buffer_size(pd, Bflag);
1267 if (status != 0)
1268 error("%s: Can't set buffer size: %s",
1269 device, pcap_statustostr(status));
1270 }
1271 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1272 if (jflag != -1) {
1273 status = pcap_set_tstamp_type(pd, jflag);
1274 if (status < 0)
1275 error("%s: Can't set time stamp type: %s",
1276 device, pcap_statustostr(status));
1277 }
1278 #endif
1279 status = pcap_activate(pd);
1280 if (status < 0) {
1281 /*
1282 * pcap_activate() failed.
1283 */
1284 cp = pcap_geterr(pd);
1285 if (status == PCAP_ERROR)
1286 error("%s", cp);
1287 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1288 status == PCAP_ERROR_PERM_DENIED) &&
1289 *cp != '\0')
1290 error("%s: %s\n(%s)", device,
1291 pcap_statustostr(status), cp);
1292 else
1293 error("%s: %s", device,
1294 pcap_statustostr(status));
1295 } else if (status > 0) {
1296 /*
1297 * pcap_activate() succeeded, but it's warning us
1298 * of a problem it had.
1299 */
1300 cp = pcap_geterr(pd);
1301 if (status == PCAP_WARNING)
1302 warning("%s", cp);
1303 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1304 *cp != '\0')
1305 warning("%s: %s\n(%s)", device,
1306 pcap_statustostr(status), cp);
1307 else
1308 warning("%s: %s", device,
1309 pcap_statustostr(status));
1310 }
1311 #else
1312 *ebuf = '\0';
1313 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1314 if (pd == NULL)
1315 error("%s", ebuf);
1316 else if (*ebuf)
1317 warning("%s", ebuf);
1318 #endif /* HAVE_PCAP_CREATE */
1319 /*
1320 * Let user own process after socket has been opened.
1321 */
1322 #ifndef WIN32
1323 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1324 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1325 #endif /* WIN32 */
1326 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1327 if(Bflag != 0)
1328 if(pcap_setbuff(pd, Bflag)==-1){
1329 error("%s", pcap_geterr(pd));
1330 }
1331 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1332 if (Lflag)
1333 show_dlts_and_exit(device, pd);
1334 if (gndo->ndo_dlt >= 0) {
1335 #ifdef HAVE_PCAP_SET_DATALINK
1336 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1337 error("%s", pcap_geterr(pd));
1338 #else
1339 /*
1340 * We don't actually support changing the
1341 * data link type, so we only let them
1342 * set it to what it already is.
1343 */
1344 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1345 error("%s is not one of the DLTs supported by this device\n",
1346 gndo->ndo_dltname);
1347 }
1348 #endif
1349 (void)fprintf(stderr, "%s: data link type %s\n",
1350 program_name, gndo->ndo_dltname);
1351 (void)fflush(stderr);
1352 }
1353 i = pcap_snapshot(pd);
1354 if (snaplen < i) {
1355 warning("snaplen raised from %d to %d", snaplen, i);
1356 snaplen = i;
1357 }
1358 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1359 localnet = 0;
1360 netmask = 0;
1361 warning("%s", ebuf);
1362 }
1363 }
1364 if (infile)
1365 cmdbuf = read_infile(infile);
1366 else
1367 cmdbuf = copy_argv(&argv[optind]);
1368
1369 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1370 error("%s", pcap_geterr(pd));
1371 if (dflag) {
1372 bpf_dump(&fcode, dflag);
1373 pcap_close(pd);
1374 free(cmdbuf);
1375 exit(0);
1376 }
1377 init_addrtoname(localnet, netmask);
1378 init_checksum();
1379
1380 #ifndef WIN32
1381 (void)setsignal(SIGPIPE, cleanup);
1382 (void)setsignal(SIGTERM, cleanup);
1383 (void)setsignal(SIGINT, cleanup);
1384 #endif /* WIN32 */
1385 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1386 (void)setsignal(SIGCHLD, child_cleanup);
1387 #endif
1388 /* Cooperate with nohup(1) */
1389 #ifndef WIN32
1390 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1391 (void)setsignal(SIGHUP, oldhandler);
1392 #endif /* WIN32 */
1393
1394 #ifndef WIN32
1395 /*
1396 * If a user name was specified with "-Z", attempt to switch to
1397 * that user's UID. This would probably be used with sudo,
1398 * to allow tcpdump to be run in a special restricted
1399 * account (if you just want to allow users to open capture
1400 * devices, and can't just give users that permission,
1401 * you'd make tcpdump set-UID or set-GID).
1402 *
1403 * Tcpdump doesn't necessarily write only to one savefile;
1404 * the general only way to allow a -Z instance to write to
1405 * savefiles as the user under whose UID it's run, rather
1406 * than as the user specified with -Z, would thus be to switch
1407 * to the original user ID before opening a capture file and
1408 * then switch back to the -Z user ID after opening the savefile.
1409 * Switching to the -Z user ID only after opening the first
1410 * savefile doesn't handle the general case.
1411 */
1412
1413 #ifdef HAVE_CAP_NG_H
1414 /* We are running as root and we will be writing to savefile */
1415 if ((getuid() == 0 || geteuid() == 0) && WFileName) {
1416 if (username) {
1417 /* Drop all capabilities from effective set */
1418 capng_clear(CAPNG_EFFECTIVE);
1419 /* Add capabilities we will need*/
1420 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
1421 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
1422 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
1423
1424 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
1425 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
1426 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1427
1428 capng_apply(CAPNG_SELECT_BOTH);
1429 }
1430 }
1431 #endif /* HAVE_CAP_NG_H */
1432
1433 if (getuid() == 0 || geteuid() == 0) {
1434 if (username || chroot_dir)
1435 droproot(username, chroot_dir);
1436
1437 }
1438 #endif /* WIN32 */
1439
1440 if (pcap_setfilter(pd, &fcode) < 0)
1441 error("%s", pcap_geterr(pd));
1442 if (WFileName) {
1443 pcap_dumper_t *p;
1444 /* Do not exceed the default PATH_MAX for files. */
1445 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1446
1447 if (dumpinfo.CurrentFileName == NULL)
1448 error("malloc of dumpinfo.CurrentFileName");
1449
1450 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1451 if (Cflag != 0)
1452 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1453 else
1454 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1455
1456 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1457 #ifdef HAVE_CAP_NG_H
1458 /* Give up capabilities, clear Effective set */
1459 capng_clear(CAPNG_EFFECTIVE);
1460 #endif
1461 if (p == NULL)
1462 error("%s", pcap_geterr(pd));
1463 if (Cflag != 0 || Gflag != 0) {
1464 callback = dump_packet_and_trunc;
1465 dumpinfo.WFileName = WFileName;
1466 dumpinfo.pd = pd;
1467 dumpinfo.p = p;
1468 pcap_userdata = (u_char *)&dumpinfo;
1469 } else {
1470 callback = dump_packet;
1471 pcap_userdata = (u_char *)p;
1472 }
1473 #ifdef HAVE_PCAP_DUMP_FLUSH
1474 if (Uflag)
1475 pcap_dump_flush(p);
1476 #endif
1477 } else {
1478 type = pcap_datalink(pd);
1479 printinfo = get_print_info(type);
1480 callback = print_packet;
1481 pcap_userdata = (u_char *)&printinfo;
1482 }
1483
1484 #ifdef SIGNAL_REQ_INFO
1485 /*
1486 * We can't get statistics when reading from a file rather
1487 * than capturing from a device.
1488 */
1489 if (RFileName == NULL)
1490 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1491 #endif
1492
1493 if (vflag > 0 && WFileName) {
1494 /*
1495 * When capturing to a file, "-v" means tcpdump should,
1496 * every 10 secodns, "v"erbosely report the number of
1497 * packets captured.
1498 */
1499 #ifdef USE_WIN32_MM_TIMER
1500 /* call verbose_stats_dump() each 1000 +/-100msec */
1501 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1502 setvbuf(stderr, NULL, _IONBF, 0);
1503 #elif defined(HAVE_ALARM)
1504 (void)setsignal(SIGALRM, verbose_stats_dump);
1505 alarm(1);
1506 #endif
1507 }
1508
1509 #ifndef WIN32
1510 if (RFileName == NULL) {
1511 /*
1512 * Live capture (if -V was specified, we set RFileName
1513 * to a file from the -V file). Print a message to
1514 * the standard error on UN*X.
1515 */
1516 if (!vflag && !WFileName) {
1517 (void)fprintf(stderr,
1518 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1519 program_name);
1520 } else
1521 (void)fprintf(stderr, "%s: ", program_name);
1522 dlt = pcap_datalink(pd);
1523 dlt_name = pcap_datalink_val_to_name(dlt);
1524 if (dlt_name == NULL) {
1525 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1526 device, dlt, snaplen);
1527 } else {
1528 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1529 device, dlt_name,
1530 pcap_datalink_val_to_description(dlt), snaplen);
1531 }
1532 (void)fflush(stderr);
1533 }
1534 #endif /* WIN32 */
1535 do {
1536 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1537 if (WFileName == NULL) {
1538 /*
1539 * We're printing packets. Flush the printed output,
1540 * so it doesn't get intermingled with error output.
1541 */
1542 if (status == -2) {
1543 /*
1544 * We got interrupted, so perhaps we didn't
1545 * manage to finish a line we were printing.
1546 * Print an extra newline, just in case.
1547 */
1548 putchar('\n');
1549 }
1550 (void)fflush(stdout);
1551 }
1552 if (status == -2) {
1553 /*
1554 * We got interrupted. If we are reading multiple
1555 * files (via -V) set these so that we stop.
1556 */
1557 VFileName = NULL;
1558 ret = NULL;
1559 }
1560 if (status == -1) {
1561 /*
1562 * Error. Report it.
1563 */
1564 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1565 program_name, pcap_geterr(pd));
1566 }
1567 if (RFileName == NULL) {
1568 /*
1569 * We're doing a live capture. Report the capture
1570 * statistics.
1571 */
1572 info(1);
1573 }
1574 pcap_close(pd);
1575 if (VFileName != NULL) {
1576 ret = get_next_file(VFile, VFileLine);
1577 if (ret) {
1578 RFileName = VFileLine;
1579 pd = pcap_open_offline(RFileName, ebuf);
1580 if (pd == NULL)
1581 error("%s", ebuf);
1582 new_dlt = pcap_datalink(pd);
1583 if (WFileName && new_dlt != dlt)
1584 error("%s: new dlt does not match original", RFileName);
1585 printinfo = get_print_info(new_dlt);
1586 dlt_name = pcap_datalink_val_to_name(new_dlt);
1587 if (dlt_name == NULL) {
1588 fprintf(stderr, "reading from file %s, link-type %u\n",
1589 RFileName, new_dlt);
1590 } else {
1591 fprintf(stderr,
1592 "reading from file %s, link-type %s (%s)\n",
1593 RFileName, dlt_name,
1594 pcap_datalink_val_to_description(new_dlt));
1595 }
1596 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1597 error("%s", pcap_geterr(pd));
1598 if (pcap_setfilter(pd, &fcode) < 0)
1599 error("%s", pcap_geterr(pd));
1600 }
1601 }
1602 }
1603 while (ret != NULL);
1604
1605 free(cmdbuf);
1606 exit(status == -1 ? 1 : 0);
1607 }
1608
1609 /* make a clean exit on interrupts */
1610 static RETSIGTYPE
1611 cleanup(int signo _U_)
1612 {
1613 #ifdef USE_WIN32_MM_TIMER
1614 if (timer_id)
1615 timeKillEvent(timer_id);
1616 timer_id = 0;
1617 #elif defined(HAVE_ALARM)
1618 alarm(0);
1619 #endif
1620
1621 #ifdef HAVE_PCAP_BREAKLOOP
1622 /*
1623 * We have "pcap_breakloop()"; use it, so that we do as little
1624 * as possible in the signal handler (it's probably not safe
1625 * to do anything with standard I/O streams in a signal handler -
1626 * the ANSI C standard doesn't say it is).
1627 */
1628 pcap_breakloop(pd);
1629 #else
1630 /*
1631 * We don't have "pcap_breakloop()"; this isn't safe, but
1632 * it's the best we can do. Print the summary if we're
1633 * not reading from a savefile - i.e., if we're doing a
1634 * live capture - and exit.
1635 */
1636 if (pd != NULL && pcap_file(pd) == NULL) {
1637 /*
1638 * We got interrupted, so perhaps we didn't
1639 * manage to finish a line we were printing.
1640 * Print an extra newline, just in case.
1641 */
1642 putchar('\n');
1643 (void)fflush(stdout);
1644 info(1);
1645 }
1646 exit(0);
1647 #endif
1648 }
1649
1650 /*
1651 On windows, we do not use a fork, so we do not care less about
1652 waiting a child processes to die
1653 */
1654 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1655 static RETSIGTYPE
1656 child_cleanup(int signo _U_)
1657 {
1658 wait(NULL);
1659 }
1660 #endif /* HAVE_FORK && HAVE_VFORK */
1661
1662 static void
1663 info(register int verbose)
1664 {
1665 struct pcap_stat stat;
1666
1667 /*
1668 * Older versions of libpcap didn't set ps_ifdrop on some
1669 * platforms; initialize it to 0 to handle that.
1670 */
1671 stat.ps_ifdrop = 0;
1672 if (pcap_stats(pd, &stat) < 0) {
1673 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1674 infoprint = 0;
1675 return;
1676 }
1677
1678 if (!verbose)
1679 fprintf(stderr, "%s: ", program_name);
1680
1681 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1682 PLURAL_SUFFIX(packets_captured));
1683 if (!verbose)
1684 fputs(", ", stderr);
1685 else
1686 putc('\n', stderr);
1687 (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1688 PLURAL_SUFFIX(stat.ps_recv));
1689 if (!verbose)
1690 fputs(", ", stderr);
1691 else
1692 putc('\n', stderr);
1693 (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1694 PLURAL_SUFFIX(stat.ps_drop));
1695 if (stat.ps_ifdrop != 0) {
1696 if (!verbose)
1697 fputs(", ", stderr);
1698 else
1699 putc('\n', stderr);
1700 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1701 stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1702 } else
1703 putc('\n', stderr);
1704 infoprint = 0;
1705 }
1706
1707 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1708 static void
1709 compress_savefile(const char *filename)
1710 {
1711 # ifdef HAVE_FORK
1712 if (fork())
1713 # else
1714 if (vfork())
1715 # endif
1716 return;
1717 /*
1718 * Set to lowest priority so that this doesn't disturb the capture
1719 */
1720 #ifdef NZERO
1721 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1722 #else
1723 setpriority(PRIO_PROCESS, 0, 19);
1724 #endif
1725 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1726 fprintf(stderr,
1727 "compress_savefile:execlp(%s, %s): %s\n",
1728 zflag,
1729 filename,
1730 strerror(errno));
1731 # ifdef HAVE_FORK
1732 exit(1);
1733 # else
1734 _exit(1);
1735 # endif
1736 }
1737 #else /* HAVE_FORK && HAVE_VFORK */
1738 static void
1739 compress_savefile(const char *filename)
1740 {
1741 fprintf(stderr,
1742 "compress_savefile failed. Functionality not implemented under your system\n");
1743 }
1744 #endif /* HAVE_FORK && HAVE_VFORK */
1745
1746 static void
1747 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1748 {
1749 struct dump_info *dump_info;
1750
1751 ++packets_captured;
1752
1753 ++infodelay;
1754
1755 dump_info = (struct dump_info *)user;
1756
1757 /*
1758 * XXX - this won't force the file to rotate on the specified time
1759 * boundary, but it will rotate on the first packet received after the
1760 * specified Gflag number of seconds. Note: if a Gflag time boundary
1761 * and a Cflag size boundary coincide, the time rotation will occur
1762 * first thereby cancelling the Cflag boundary (since the file should
1763 * be 0).
1764 */
1765 if (Gflag != 0) {
1766 /* Check if it is time to rotate */
1767 time_t t;
1768
1769 /* Get the current time */
1770 if ((t = time(NULL)) == (time_t)-1) {
1771 error("dump_and_trunc_packet: can't get current_time: %s",
1772 pcap_strerror(errno));
1773 }
1774
1775
1776 /* If the time is greater than the specified window, rotate */
1777 if (t - Gflag_time >= Gflag) {
1778 /* Update the Gflag_time */
1779 Gflag_time = t;
1780 /* Update Gflag_count */
1781 Gflag_count++;
1782 /*
1783 * Close the current file and open a new one.
1784 */
1785 pcap_dump_close(dump_info->p);
1786
1787 /*
1788 * Compress the file we just closed, if the user asked for it
1789 */
1790 if (zflag != NULL)
1791 compress_savefile(dump_info->CurrentFileName);
1792
1793 /*
1794 * Check to see if we've exceeded the Wflag (when
1795 * not using Cflag).
1796 */
1797 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1798 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1799 Wflag);
1800 exit(0);
1801 /* NOTREACHED */
1802 }
1803 if (dump_info->CurrentFileName != NULL)
1804 free(dump_info->CurrentFileName);
1805 /* Allocate space for max filename + \0. */
1806 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1807 if (dump_info->CurrentFileName == NULL)
1808 error("dump_packet_and_trunc: malloc");
1809 /*
1810 * This is always the first file in the Cflag
1811 * rotation: e.g. 0
1812 * We also don't need numbering if Cflag is not set.
1813 */
1814 if (Cflag != 0)
1815 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1816 WflagChars);
1817 else
1818 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1819
1820 #ifdef HAVE_CAP_NG_H
1821 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1822 capng_apply(CAPNG_EFFECTIVE);
1823 #endif /* HAVE_CAP_NG_H */
1824 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1825 #ifdef HAVE_CAP_NG_H
1826 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1827 capng_apply(CAPNG_EFFECTIVE);
1828 #endif /* HAVE_CAP_NG_H */
1829 if (dump_info->p == NULL)
1830 error("%s", pcap_geterr(pd));
1831 }
1832 }
1833
1834 /*
1835 * XXX - this won't prevent capture files from getting
1836 * larger than Cflag - the last packet written to the
1837 * file could put it over Cflag.
1838 */
1839 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1840 /*
1841 * Close the current file and open a new one.
1842 */
1843 pcap_dump_close(dump_info->p);
1844
1845 /*
1846 * Compress the file we just closed, if the user asked for it
1847 */
1848 if (zflag != NULL)
1849 compress_savefile(dump_info->CurrentFileName);
1850
1851 Cflag_count++;
1852 if (Wflag > 0) {
1853 if (Cflag_count >= Wflag)
1854 Cflag_count = 0;
1855 }
1856 if (dump_info->CurrentFileName != NULL)
1857 free(dump_info->CurrentFileName);
1858 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1859 if (dump_info->CurrentFileName == NULL)
1860 error("dump_packet_and_trunc: malloc");
1861 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1862 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1863 if (dump_info->p == NULL)
1864 error("%s", pcap_geterr(pd));
1865 }
1866
1867 pcap_dump((u_char *)dump_info->p, h, sp);
1868 #ifdef HAVE_PCAP_DUMP_FLUSH
1869 if (Uflag)
1870 pcap_dump_flush(dump_info->p);
1871 #endif
1872
1873 --infodelay;
1874 if (infoprint)
1875 info(0);
1876 }
1877
1878 static void
1879 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1880 {
1881 ++packets_captured;
1882
1883 ++infodelay;
1884
1885 pcap_dump(user, h, sp);
1886 #ifdef HAVE_PCAP_DUMP_FLUSH
1887 if (Uflag)
1888 pcap_dump_flush((pcap_dumper_t *)user);
1889 #endif
1890
1891 --infodelay;
1892 if (infoprint)
1893 info(0);
1894 }
1895
1896 static void
1897 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1898 {
1899 struct print_info *print_info;
1900 u_int hdrlen;
1901
1902 ++packets_captured;
1903
1904 ++infodelay;
1905 ts_print(&h->ts);
1906
1907 print_info = (struct print_info *)user;
1908
1909 /*
1910 * Some printers want to check that they're not walking off the
1911 * end of the packet.
1912 * Rather than pass it all the way down, we set this global.
1913 */
1914 snapend = sp + h->caplen;
1915
1916 if(print_info->ndo_type) {
1917 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1918 } else {
1919 hdrlen = (*print_info->p.printer)(h, sp);
1920 }
1921
1922 if (Xflag) {
1923 /*
1924 * Print the raw packet data in hex and ASCII.
1925 */
1926 if (Xflag > 1) {
1927 /*
1928 * Include the link-layer header.
1929 */
1930 hex_and_ascii_print("\n\t", sp, h->caplen);
1931 } else {
1932 /*
1933 * Don't include the link-layer header - and if
1934 * we have nothing past the link-layer header,
1935 * print nothing.
1936 */
1937 if (h->caplen > hdrlen)
1938 hex_and_ascii_print("\n\t", sp + hdrlen,
1939 h->caplen - hdrlen);
1940 }
1941 } else if (xflag) {
1942 /*
1943 * Print the raw packet data in hex.
1944 */
1945 if (xflag > 1) {
1946 /*
1947 * Include the link-layer header.
1948 */
1949 hex_print("\n\t", sp, h->caplen);
1950 } else {
1951 /*
1952 * Don't include the link-layer header - and if
1953 * we have nothing past the link-layer header,
1954 * print nothing.
1955 */
1956 if (h->caplen > hdrlen)
1957 hex_print("\n\t", sp + hdrlen,
1958 h->caplen - hdrlen);
1959 }
1960 } else if (Aflag) {
1961 /*
1962 * Print the raw packet data in ASCII.
1963 */
1964 if (Aflag > 1) {
1965 /*
1966 * Include the link-layer header.
1967 */
1968 ascii_print(sp, h->caplen);
1969 } else {
1970 /*
1971 * Don't include the link-layer header - and if
1972 * we have nothing past the link-layer header,
1973 * print nothing.
1974 */
1975 if (h->caplen > hdrlen)
1976 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1977 }
1978 }
1979
1980 putchar('\n');
1981
1982 --infodelay;
1983 if (infoprint)
1984 info(0);
1985 }
1986
1987 #ifdef WIN32
1988 /*
1989 * XXX - there should really be libpcap calls to get the version
1990 * number as a string (the string would be generated from #defines
1991 * at run time, so that it's not generated from string constants
1992 * in the library, as, on many UNIX systems, those constants would
1993 * be statically linked into the application executable image, and
1994 * would thus reflect the version of libpcap on the system on
1995 * which the application was *linked*, not the system on which it's
1996 * *running*.
1997 *
1998 * That routine should be documented, unlike the "version[]"
1999 * string, so that UNIX vendors providing their own libpcaps
2000 * don't omit it (as a couple of vendors have...).
2001 *
2002 * Packet.dll should perhaps also export a routine to return the
2003 * version number of the Packet.dll code, to supply the
2004 * "Wpcap_version" information on Windows.
2005 */
2006 char WDversion[]="current-cvs.tcpdump.org";
2007 #if !defined(HAVE_GENERATED_VERSION)
2008 char version[]="current-cvs.tcpdump.org";
2009 #endif
2010 char pcap_version[]="current-cvs.tcpdump.org";
2011 char Wpcap_version[]="3.1";
2012 #endif
2013
2014 /*
2015 * By default, print the specified data out in hex and ASCII.
2016 */
2017 static void
2018 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
2019 {
2020 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
2021 }
2022
2023 void
2024 default_print(const u_char *bp, u_int length)
2025 {
2026 ndo_default_print(gndo, bp, length);
2027 }
2028
2029 #ifdef SIGNAL_REQ_INFO
2030 RETSIGTYPE requestinfo(int signo _U_)
2031 {
2032 if (infodelay)
2033 ++infoprint;
2034 else
2035 info(0);
2036 }
2037 #endif
2038
2039 /*
2040 * Called once each second in verbose mode while dumping to file
2041 */
2042 #ifdef USE_WIN32_MM_TIMER
2043 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2044 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2045 {
2046 struct pcap_stat stat;
2047
2048 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2049 fprintf(stderr, "Got %u\r", packets_captured);
2050 }
2051 #elif defined(HAVE_ALARM)
2052 static void verbose_stats_dump(int sig _U_)
2053 {
2054 struct pcap_stat stat;
2055
2056 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2057 fprintf(stderr, "Got %u\r", packets_captured);
2058 alarm(1);
2059 }
2060 #endif
2061
2062 static void
2063 usage(void)
2064 {
2065 extern char version[];
2066 #ifndef HAVE_PCAP_LIB_VERSION
2067 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2068 extern char pcap_version[];
2069 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2070 static char pcap_version[] = "unknown";
2071 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2072 #endif /* HAVE_PCAP_LIB_VERSION */
2073
2074 #ifdef HAVE_PCAP_LIB_VERSION
2075 #ifdef WIN32
2076 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2077 #else /* WIN32 */
2078 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2079 #endif /* WIN32 */
2080 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2081 #else /* HAVE_PCAP_LIB_VERSION */
2082 #ifdef WIN32
2083 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2084 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2085 #else /* WIN32 */
2086 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2087 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2088 #endif /* WIN32 */
2089 #endif /* HAVE_PCAP_LIB_VERSION */
2090 (void)fprintf(stderr,
2091 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2092 (void)fprintf(stderr,
2093 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2094 (void)fprintf(stderr,
2095 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
2096 (void)fprintf(stderr,
2097 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
2098 (void)fprintf(stderr,
2099 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2100 (void)fprintf(stderr,
2101 "\t\t[ -Z user ] [ expression ]\n");
2102 exit(1);
2103 }
2104
2105
2106
2107 /* VARARGS */
2108 static void
2109 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2110 {
2111 va_list ap;
2112
2113 (void)fprintf(stderr, "%s: ", program_name);
2114 va_start(ap, fmt);
2115 (void)vfprintf(stderr, fmt, ap);
2116 va_end(ap);
2117 if (*fmt) {
2118 fmt += strlen(fmt);
2119 if (fmt[-1] != '\n')
2120 (void)fputc('\n', stderr);
2121 }
2122 exit(1);
2123 /* NOTREACHED */
2124 }
2125
2126 /* VARARGS */
2127 static void
2128 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2129 {
2130 va_list ap;
2131
2132 (void)fprintf(stderr, "%s: WARNING: ", program_name);
2133 va_start(ap, fmt);
2134 (void)vfprintf(stderr, fmt, ap);
2135 va_end(ap);
2136 if (*fmt) {
2137 fmt += strlen(fmt);
2138 if (fmt[-1] != '\n')
2139 (void)fputc('\n', stderr);
2140 }
2141 }
[mirror] the TCPdump network dissector