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Merge branch 'master' of git://github.com/mcr/tcpdump
[tcpdump] / tcpdump.c
1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Support for splitting captures into multiple files with a maximum
22 * file size:
23 *
24 * Copyright (c) 2001
25 * Seth Webster <swebster@sst.ll.mit.edu>
26 */
27
28 #ifndef lint
29 static const char copyright[] _U_ =
30 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
31 The Regents of the University of California. All rights reserved.\n";
32 static const char rcsid[] _U_ =
33 "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)";
34 #endif
35
36 /*
37 * tcpdump - monitor tcp/ip traffic on an ethernet.
38 *
39 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
40 * Mercilessly hacked and occasionally improved since then via the
41 * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
42 */
43
44 #ifdef HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47
48 #include <tcpdump-stdinc.h>
49
50 #ifdef WIN32
51 #include "getopt.h"
52 #include "w32_fzs.h"
53 extern int strcasecmp (const char *__s1, const char *__s2);
54 extern int SIZE_BUF;
55 #define off_t long
56 #define uint UINT
57 #endif /* WIN32 */
58
59 #ifdef HAVE_SMI_H
60 #include <smi.h>
61 #endif
62
63 #include <pcap.h>
64 #include <signal.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #include <limits.h>
69 #ifndef WIN32
70 #include <sys/wait.h>
71 #include <sys/resource.h>
72 #include <pwd.h>
73 #include <grp.h>
74 #include <errno.h>
75 #endif /* WIN32 */
76
77 /* 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
1017 error("unknown packet type `%s'", optarg);
1018 break;
1019
1020 case 'u':
1021 ++uflag;
1022 break;
1023
1024 #ifdef HAVE_PCAP_DUMP_FLUSH
1025 case 'U':
1026 ++Uflag;
1027 break;
1028 #endif
1029
1030 case 'v':
1031 ++vflag;
1032 break;
1033
1034 case 'V':
1035 VFileName = optarg;
1036 break;
1037
1038 case 'w':
1039 WFileName = optarg;
1040 break;
1041
1042 case 'W':
1043 Wflag = atoi(optarg);
1044 if (Wflag < 0)
1045 error("invalid number of output files %s", optarg);
1046 WflagChars = getWflagChars(Wflag);
1047 break;
1048
1049 case 'x':
1050 ++xflag;
1051 ++suppress_default_print;
1052 break;
1053
1054 case 'X':
1055 ++Xflag;
1056 ++suppress_default_print;
1057 break;
1058
1059 case 'y':
1060 gndo->ndo_dltname = optarg;
1061 gndo->ndo_dlt =
1062 pcap_datalink_name_to_val(gndo->ndo_dltname);
1063 if (gndo->ndo_dlt < 0)
1064 error("invalid data link type %s", gndo->ndo_dltname);
1065 break;
1066
1067 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1068 case 'Y':
1069 {
1070 /* Undocumented flag */
1071 #ifdef HAVE_PCAP_DEBUG
1072 extern int pcap_debug;
1073 pcap_debug = 1;
1074 #else
1075 extern int yydebug;
1076 yydebug = 1;
1077 #endif
1078 }
1079 break;
1080 #endif
1081 case 'z':
1082 if (optarg) {
1083 zflag = strdup(optarg);
1084 } else {
1085 usage();
1086 /* NOTREACHED */
1087 }
1088 break;
1089
1090 case 'Z':
1091 if (optarg) {
1092 username = strdup(optarg);
1093 }
1094 else {
1095 usage();
1096 /* NOTREACHED */
1097 }
1098 break;
1099
1100 default:
1101 usage();
1102 /* NOTREACHED */
1103 }
1104
1105 switch (tflag) {
1106
1107 case 0: /* Default */
1108 case 4: /* Default + Date*/
1109 thiszone = gmt2local(0);
1110 break;
1111
1112 case 1: /* No time stamp */
1113 case 2: /* Unix timeval style */
1114 case 3: /* Microseconds since previous packet */
1115 case 5: /* Microseconds since first packet */
1116 break;
1117
1118 default: /* Not supported */
1119 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1120 break;
1121 }
1122
1123 if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1124 error("-f can not be used with -V or -r");
1125
1126 if (VFileName != NULL && RFileName != NULL)
1127 error("-V and -r are mutually exclusive.");
1128
1129 #ifdef WITH_CHROOT
1130 /* if run as root, prepare for chrooting */
1131 if (getuid() == 0 || geteuid() == 0) {
1132 /* future extensibility for cmd-line arguments */
1133 if (!chroot_dir)
1134 chroot_dir = WITH_CHROOT;
1135 }
1136 #endif
1137
1138 #ifdef WITH_USER
1139 /* if run as root, prepare for dropping root privileges */
1140 if (getuid() == 0 || geteuid() == 0) {
1141 /* Run with '-Z root' to restore old behaviour */
1142 if (!username)
1143 username = WITH_USER;
1144 }
1145 #endif
1146
1147 if (RFileName != NULL || VFileName != NULL) {
1148 /*
1149 * If RFileName is non-null, it's the pathname of a
1150 * savefile to read. If VFileName is non-null, it's
1151 * the pathname of a file containing a list of pathnames
1152 * (one per line) of savefiles to read.
1153 *
1154 * In either case, we're reading a savefile, not doing
1155 * a live capture.
1156 */
1157 #ifndef WIN32
1158 /*
1159 * We don't need network access, so relinquish any set-UID
1160 * or set-GID privileges we have (if any).
1161 *
1162 * We do *not* want set-UID privileges when opening a
1163 * trace file, as that might let the user read other
1164 * people's trace files (especially if we're set-UID
1165 * root).
1166 */
1167 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1168 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1169 #endif /* WIN32 */
1170 if (VFileName != NULL) {
1171 if (VFileName[0] == '-' && VFileName[1] == '\0')
1172 VFile = stdin;
1173 else
1174 VFile = fopen(VFileName, "r");
1175
1176 if (VFile == NULL)
1177 error("Unable to open file: %s\n", strerror(errno));
1178
1179 ret = get_next_file(VFile, VFileLine);
1180 if (!ret)
1181 error("Nothing in %s\n", VFileName);
1182 RFileName = VFileLine;
1183 }
1184
1185 pd = pcap_open_offline(RFileName, ebuf);
1186 if (pd == NULL)
1187 error("%s", ebuf);
1188 dlt = pcap_datalink(pd);
1189 dlt_name = pcap_datalink_val_to_name(dlt);
1190 if (dlt_name == NULL) {
1191 fprintf(stderr, "reading from file %s, link-type %u\n",
1192 RFileName, dlt);
1193 } else {
1194 fprintf(stderr,
1195 "reading from file %s, link-type %s (%s)\n",
1196 RFileName, dlt_name,
1197 pcap_datalink_val_to_description(dlt));
1198 }
1199 localnet = 0;
1200 netmask = 0;
1201 } else {
1202 /*
1203 * We're doing a live capture.
1204 */
1205 if (device == NULL) {
1206 device = pcap_lookupdev(ebuf);
1207 if (device == NULL)
1208 error("%s", ebuf);
1209 }
1210 #ifdef WIN32
1211 /*
1212 * Print a message to the standard error on Windows.
1213 * XXX - why do it here, with a different message?
1214 */
1215 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1216 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1217 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1218 }
1219 else
1220 {
1221 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1222 }
1223
1224 fflush(stderr);
1225 #endif /* WIN32 */
1226 #ifdef HAVE_PCAP_CREATE
1227 pd = pcap_create(device, ebuf);
1228 if (pd == NULL)
1229 error("%s", ebuf);
1230 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1231 if (Jflag)
1232 show_tstamp_types_and_exit(device, pd);
1233 #endif
1234 /*
1235 * Is this an interface that supports monitor mode?
1236 */
1237 if (pcap_can_set_rfmon(pd) == 1)
1238 supports_monitor_mode = 1;
1239 else
1240 supports_monitor_mode = 0;
1241 status = pcap_set_snaplen(pd, snaplen);
1242 if (status != 0)
1243 error("%s: Can't set snapshot length: %s",
1244 device, pcap_statustostr(status));
1245 status = pcap_set_promisc(pd, !pflag);
1246 if (status != 0)
1247 error("%s: Can't set promiscuous mode: %s",
1248 device, pcap_statustostr(status));
1249 if (Iflag) {
1250 status = pcap_set_rfmon(pd, 1);
1251 if (status != 0)
1252 error("%s: Can't set monitor mode: %s",
1253 device, pcap_statustostr(status));
1254 }
1255 status = pcap_set_timeout(pd, 1000);
1256 if (status != 0)
1257 error("%s: pcap_set_timeout failed: %s",
1258 device, pcap_statustostr(status));
1259 if (Bflag != 0) {
1260 status = pcap_set_buffer_size(pd, Bflag);
1261 if (status != 0)
1262 error("%s: Can't set buffer size: %s",
1263 device, pcap_statustostr(status));
1264 }
1265 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1266 if (jflag != -1) {
1267 status = pcap_set_tstamp_type(pd, jflag);
1268 if (status < 0)
1269 error("%s: Can't set time stamp type: %s",
1270 device, pcap_statustostr(status));
1271 }
1272 #endif
1273 status = pcap_activate(pd);
1274 if (status < 0) {
1275 /*
1276 * pcap_activate() failed.
1277 */
1278 cp = pcap_geterr(pd);
1279 if (status == PCAP_ERROR)
1280 error("%s", cp);
1281 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1282 status == PCAP_ERROR_PERM_DENIED) &&
1283 *cp != '\0')
1284 error("%s: %s\n(%s)", device,
1285 pcap_statustostr(status), cp);
1286 else
1287 error("%s: %s", device,
1288 pcap_statustostr(status));
1289 } else if (status > 0) {
1290 /*
1291 * pcap_activate() succeeded, but it's warning us
1292 * of a problem it had.
1293 */
1294 cp = pcap_geterr(pd);
1295 if (status == PCAP_WARNING)
1296 warning("%s", cp);
1297 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1298 *cp != '\0')
1299 warning("%s: %s\n(%s)", device,
1300 pcap_statustostr(status), cp);
1301 else
1302 warning("%s: %s", device,
1303 pcap_statustostr(status));
1304 }
1305 #else
1306 *ebuf = '\0';
1307 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1308 if (pd == NULL)
1309 error("%s", ebuf);
1310 else if (*ebuf)
1311 warning("%s", ebuf);
1312 #endif /* HAVE_PCAP_CREATE */
1313 /*
1314 * Let user own process after socket has been opened.
1315 */
1316 #ifndef WIN32
1317 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1318 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1319 #endif /* WIN32 */
1320 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1321 if(Bflag != 0)
1322 if(pcap_setbuff(pd, Bflag)==-1){
1323 error("%s", pcap_geterr(pd));
1324 }
1325 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1326 if (Lflag)
1327 show_dlts_and_exit(device, pd);
1328 if (gndo->ndo_dlt >= 0) {
1329 #ifdef HAVE_PCAP_SET_DATALINK
1330 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1331 error("%s", pcap_geterr(pd));
1332 #else
1333 /*
1334 * We don't actually support changing the
1335 * data link type, so we only let them
1336 * set it to what it already is.
1337 */
1338 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1339 error("%s is not one of the DLTs supported by this device\n",
1340 gndo->ndo_dltname);
1341 }
1342 #endif
1343 (void)fprintf(stderr, "%s: data link type %s\n",
1344 program_name, gndo->ndo_dltname);
1345 (void)fflush(stderr);
1346 }
1347 i = pcap_snapshot(pd);
1348 if (snaplen < i) {
1349 warning("snaplen raised from %d to %d", snaplen, i);
1350 snaplen = i;
1351 }
1352 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1353 localnet = 0;
1354 netmask = 0;
1355 warning("%s", ebuf);
1356 }
1357 }
1358 if (infile)
1359 cmdbuf = read_infile(infile);
1360 else
1361 cmdbuf = copy_argv(&argv[optind]);
1362
1363 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1364 error("%s", pcap_geterr(pd));
1365 if (dflag) {
1366 bpf_dump(&fcode, dflag);
1367 pcap_close(pd);
1368 free(cmdbuf);
1369 exit(0);
1370 }
1371 init_addrtoname(localnet, netmask);
1372 init_checksum();
1373
1374 #ifndef WIN32
1375 (void)setsignal(SIGPIPE, cleanup);
1376 (void)setsignal(SIGTERM, cleanup);
1377 (void)setsignal(SIGINT, cleanup);
1378 #endif /* WIN32 */
1379 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1380 (void)setsignal(SIGCHLD, child_cleanup);
1381 #endif
1382 /* Cooperate with nohup(1) */
1383 #ifndef WIN32
1384 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1385 (void)setsignal(SIGHUP, oldhandler);
1386 #endif /* WIN32 */
1387
1388 #ifndef WIN32
1389 /*
1390 * If a user name was specified with "-Z", attempt to switch to
1391 * that user's UID. This would probably be used with sudo,
1392 * to allow tcpdump to be run in a special restricted
1393 * account (if you just want to allow users to open capture
1394 * devices, and can't just give users that permission,
1395 * you'd make tcpdump set-UID or set-GID).
1396 *
1397 * Tcpdump doesn't necessarily write only to one savefile;
1398 * the general only way to allow a -Z instance to write to
1399 * savefiles as the user under whose UID it's run, rather
1400 * than as the user specified with -Z, would thus be to switch
1401 * to the original user ID before opening a capture file and
1402 * then switch back to the -Z user ID after opening the savefile.
1403 * Switching to the -Z user ID only after opening the first
1404 * savefile doesn't handle the general case.
1405 */
1406
1407 #ifdef HAVE_CAP_NG_H
1408 /* We are running as root and we will be writing to savefile */
1409 if ((getuid() == 0 || geteuid() == 0) && WFileName) {
1410 if (username) {
1411 /* Drop all capabilities from effective set */
1412 capng_clear(CAPNG_EFFECTIVE);
1413 /* Add capabilities we will need*/
1414 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
1415 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
1416 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
1417
1418 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
1419 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
1420 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1421
1422 capng_apply(CAPNG_SELECT_BOTH);
1423 }
1424 }
1425 #endif /* HAVE_CAP_NG_H */
1426
1427 if (getuid() == 0 || geteuid() == 0) {
1428 if (username || chroot_dir)
1429 droproot(username, chroot_dir);
1430
1431 }
1432 #endif /* WIN32 */
1433
1434 if (pcap_setfilter(pd, &fcode) < 0)
1435 error("%s", pcap_geterr(pd));
1436 if (WFileName) {
1437 pcap_dumper_t *p;
1438 /* Do not exceed the default PATH_MAX for files. */
1439 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1440
1441 if (dumpinfo.CurrentFileName == NULL)
1442 error("malloc of dumpinfo.CurrentFileName");
1443
1444 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1445 if (Cflag != 0)
1446 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1447 else
1448 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1449
1450 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1451 #ifdef HAVE_CAP_NG_H
1452 /* Give up capabilities, clear Effective set */
1453 capng_clear(CAPNG_EFFECTIVE);
1454 #endif
1455 if (p == NULL)
1456 error("%s", pcap_geterr(pd));
1457 if (Cflag != 0 || Gflag != 0) {
1458 callback = dump_packet_and_trunc;
1459 dumpinfo.WFileName = WFileName;
1460 dumpinfo.pd = pd;
1461 dumpinfo.p = p;
1462 pcap_userdata = (u_char *)&dumpinfo;
1463 } else {
1464 callback = dump_packet;
1465 pcap_userdata = (u_char *)p;
1466 }
1467 #ifdef HAVE_PCAP_DUMP_FLUSH
1468 if (Uflag)
1469 pcap_dump_flush(p);
1470 #endif
1471 } else {
1472 type = pcap_datalink(pd);
1473 printinfo = get_print_info(type);
1474 callback = print_packet;
1475 pcap_userdata = (u_char *)&printinfo;
1476 }
1477
1478 #ifdef SIGNAL_REQ_INFO
1479 /*
1480 * We can't get statistics when reading from a file rather
1481 * than capturing from a device.
1482 */
1483 if (RFileName == NULL)
1484 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1485 #endif
1486
1487 if (vflag > 0 && WFileName) {
1488 /*
1489 * When capturing to a file, "-v" means tcpdump should,
1490 * every 10 secodns, "v"erbosely report the number of
1491 * packets captured.
1492 */
1493 #ifdef USE_WIN32_MM_TIMER
1494 /* call verbose_stats_dump() each 1000 +/-100msec */
1495 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1496 setvbuf(stderr, NULL, _IONBF, 0);
1497 #elif defined(HAVE_ALARM)
1498 (void)setsignal(SIGALRM, verbose_stats_dump);
1499 alarm(1);
1500 #endif
1501 }
1502
1503 #ifndef WIN32
1504 if (RFileName == NULL) {
1505 /*
1506 * Live capture (if -V was specified, we set RFileName
1507 * to a file from the -V file). Print a message to
1508 * the standard error on UN*X.
1509 */
1510 if (!vflag && !WFileName) {
1511 (void)fprintf(stderr,
1512 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1513 program_name);
1514 } else
1515 (void)fprintf(stderr, "%s: ", program_name);
1516 dlt = pcap_datalink(pd);
1517 dlt_name = pcap_datalink_val_to_name(dlt);
1518 if (dlt_name == NULL) {
1519 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1520 device, dlt, snaplen);
1521 } else {
1522 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1523 device, dlt_name,
1524 pcap_datalink_val_to_description(dlt), snaplen);
1525 }
1526 (void)fflush(stderr);
1527 }
1528 #endif /* WIN32 */
1529 do {
1530 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1531 if (WFileName == NULL) {
1532 /*
1533 * We're printing packets. Flush the printed output,
1534 * so it doesn't get intermingled with error output.
1535 */
1536 if (status == -2) {
1537 /*
1538 * We got interrupted, so perhaps we didn't
1539 * manage to finish a line we were printing.
1540 * Print an extra newline, just in case.
1541 */
1542 putchar('\n');
1543 }
1544 (void)fflush(stdout);
1545 }
1546 if (status == -1) {
1547 /*
1548 * Error. Report it.
1549 */
1550 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1551 program_name, pcap_geterr(pd));
1552 }
1553 if (RFileName == NULL) {
1554 /*
1555 * We're doing a live capture. Report the capture
1556 * statistics.
1557 */
1558 info(1);
1559 }
1560 pcap_close(pd);
1561 if (VFileName != NULL) {
1562 ret = get_next_file(VFile, VFileLine);
1563 if (ret) {
1564 RFileName = VFileLine;
1565 pd = pcap_open_offline(RFileName, ebuf);
1566 if (pd == NULL)
1567 error("%s", ebuf);
1568 new_dlt = pcap_datalink(pd);
1569 if (WFileName && new_dlt != dlt)
1570 error("%s: new dlt does not match original", RFileName);
1571 printinfo = get_print_info(new_dlt);
1572 dlt_name = pcap_datalink_val_to_name(new_dlt);
1573 if (dlt_name == NULL) {
1574 fprintf(stderr, "reading from file %s, link-type %u\n",
1575 RFileName, new_dlt);
1576 } else {
1577 fprintf(stderr,
1578 "reading from file %s, link-type %s (%s)\n",
1579 RFileName, dlt_name,
1580 pcap_datalink_val_to_description(new_dlt));
1581 }
1582 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1583 error("%s", pcap_geterr(pd));
1584 if (pcap_setfilter(pd, &fcode) < 0)
1585 error("%s", pcap_geterr(pd));
1586 }
1587 }
1588 }
1589 while (ret != NULL);
1590
1591 free(cmdbuf);
1592 exit(status == -1 ? 1 : 0);
1593 }
1594
1595 /* make a clean exit on interrupts */
1596 static RETSIGTYPE
1597 cleanup(int signo _U_)
1598 {
1599 #ifdef USE_WIN32_MM_TIMER
1600 if (timer_id)
1601 timeKillEvent(timer_id);
1602 timer_id = 0;
1603 #elif defined(HAVE_ALARM)
1604 alarm(0);
1605 #endif
1606
1607 #ifdef HAVE_PCAP_BREAKLOOP
1608 /*
1609 * We have "pcap_breakloop()"; use it, so that we do as little
1610 * as possible in the signal handler (it's probably not safe
1611 * to do anything with standard I/O streams in a signal handler -
1612 * the ANSI C standard doesn't say it is).
1613 */
1614 pcap_breakloop(pd);
1615 #else
1616 /*
1617 * We don't have "pcap_breakloop()"; this isn't safe, but
1618 * it's the best we can do. Print the summary if we're
1619 * not reading from a savefile - i.e., if we're doing a
1620 * live capture - and exit.
1621 */
1622 if (pd != NULL && pcap_file(pd) == NULL) {
1623 /*
1624 * We got interrupted, so perhaps we didn't
1625 * manage to finish a line we were printing.
1626 * Print an extra newline, just in case.
1627 */
1628 putchar('\n');
1629 (void)fflush(stdout);
1630 info(1);
1631 }
1632 exit(0);
1633 #endif
1634 }
1635
1636 /*
1637 On windows, we do not use a fork, so we do not care less about
1638 waiting a child processes to die
1639 */
1640 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1641 static RETSIGTYPE
1642 child_cleanup(int signo _U_)
1643 {
1644 wait(NULL);
1645 }
1646 #endif /* HAVE_FORK && HAVE_VFORK */
1647
1648 static void
1649 info(register int verbose)
1650 {
1651 struct pcap_stat stat;
1652
1653 /*
1654 * Older versions of libpcap didn't set ps_ifdrop on some
1655 * platforms; initialize it to 0 to handle that.
1656 */
1657 stat.ps_ifdrop = 0;
1658 if (pcap_stats(pd, &stat) < 0) {
1659 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1660 infoprint = 0;
1661 return;
1662 }
1663
1664 if (!verbose)
1665 fprintf(stderr, "%s: ", program_name);
1666
1667 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1668 PLURAL_SUFFIX(packets_captured));
1669 if (!verbose)
1670 fputs(", ", stderr);
1671 else
1672 putc('\n', stderr);
1673 (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1674 PLURAL_SUFFIX(stat.ps_recv));
1675 if (!verbose)
1676 fputs(", ", stderr);
1677 else
1678 putc('\n', stderr);
1679 (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1680 PLURAL_SUFFIX(stat.ps_drop));
1681 if (stat.ps_ifdrop != 0) {
1682 if (!verbose)
1683 fputs(", ", stderr);
1684 else
1685 putc('\n', stderr);
1686 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1687 stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1688 } else
1689 putc('\n', stderr);
1690 infoprint = 0;
1691 }
1692
1693 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1694 static void
1695 compress_savefile(const char *filename)
1696 {
1697 # ifdef HAVE_FORK
1698 if (fork())
1699 # else
1700 if (vfork())
1701 # endif
1702 return;
1703 /*
1704 * Set to lowest priority so that this doesn't disturb the capture
1705 */
1706 #ifdef NZERO
1707 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1708 #else
1709 setpriority(PRIO_PROCESS, 0, 19);
1710 #endif
1711 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1712 fprintf(stderr,
1713 "compress_savefile:execlp(%s, %s): %s\n",
1714 zflag,
1715 filename,
1716 strerror(errno));
1717 # ifdef HAVE_FORK
1718 exit(1);
1719 # else
1720 _exit(1);
1721 # endif
1722 }
1723 #else /* HAVE_FORK && HAVE_VFORK */
1724 static void
1725 compress_savefile(const char *filename)
1726 {
1727 fprintf(stderr,
1728 "compress_savefile failed. Functionality not implemented under your system\n");
1729 }
1730 #endif /* HAVE_FORK && HAVE_VFORK */
1731
1732 static void
1733 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1734 {
1735 struct dump_info *dump_info;
1736
1737 ++packets_captured;
1738
1739 ++infodelay;
1740
1741 dump_info = (struct dump_info *)user;
1742
1743 /*
1744 * XXX - this won't force the file to rotate on the specified time
1745 * boundary, but it will rotate on the first packet received after the
1746 * specified Gflag number of seconds. Note: if a Gflag time boundary
1747 * and a Cflag size boundary coincide, the time rotation will occur
1748 * first thereby cancelling the Cflag boundary (since the file should
1749 * be 0).
1750 */
1751 if (Gflag != 0) {
1752 /* Check if it is time to rotate */
1753 time_t t;
1754
1755 /* Get the current time */
1756 if ((t = time(NULL)) == (time_t)-1) {
1757 error("dump_and_trunc_packet: can't get current_time: %s",
1758 pcap_strerror(errno));
1759 }
1760
1761
1762 /* If the time is greater than the specified window, rotate */
1763 if (t - Gflag_time >= Gflag) {
1764 /* Update the Gflag_time */
1765 Gflag_time = t;
1766 /* Update Gflag_count */
1767 Gflag_count++;
1768 /*
1769 * Close the current file and open a new one.
1770 */
1771 pcap_dump_close(dump_info->p);
1772
1773 /*
1774 * Compress the file we just closed, if the user asked for it
1775 */
1776 if (zflag != NULL)
1777 compress_savefile(dump_info->CurrentFileName);
1778
1779 /*
1780 * Check to see if we've exceeded the Wflag (when
1781 * not using Cflag).
1782 */
1783 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1784 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1785 Wflag);
1786 exit(0);
1787 /* NOTREACHED */
1788 }
1789 if (dump_info->CurrentFileName != NULL)
1790 free(dump_info->CurrentFileName);
1791 /* Allocate space for max filename + \0. */
1792 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1793 if (dump_info->CurrentFileName == NULL)
1794 error("dump_packet_and_trunc: malloc");
1795 /*
1796 * This is always the first file in the Cflag
1797 * rotation: e.g. 0
1798 * We also don't need numbering if Cflag is not set.
1799 */
1800 if (Cflag != 0)
1801 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1802 WflagChars);
1803 else
1804 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1805
1806 #ifdef HAVE_CAP_NG_H
1807 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1808 capng_apply(CAPNG_EFFECTIVE);
1809 #endif /* HAVE_CAP_NG_H */
1810 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1811 #ifdef HAVE_CAP_NG_H
1812 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1813 capng_apply(CAPNG_EFFECTIVE);
1814 #endif /* HAVE_CAP_NG_H */
1815 if (dump_info->p == NULL)
1816 error("%s", pcap_geterr(pd));
1817 }
1818 }
1819
1820 /*
1821 * XXX - this won't prevent capture files from getting
1822 * larger than Cflag - the last packet written to the
1823 * file could put it over Cflag.
1824 */
1825 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1826 /*
1827 * Close the current file and open a new one.
1828 */
1829 pcap_dump_close(dump_info->p);
1830
1831 /*
1832 * Compress the file we just closed, if the user asked for it
1833 */
1834 if (zflag != NULL)
1835 compress_savefile(dump_info->CurrentFileName);
1836
1837 Cflag_count++;
1838 if (Wflag > 0) {
1839 if (Cflag_count >= Wflag)
1840 Cflag_count = 0;
1841 }
1842 if (dump_info->CurrentFileName != NULL)
1843 free(dump_info->CurrentFileName);
1844 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1845 if (dump_info->CurrentFileName == NULL)
1846 error("dump_packet_and_trunc: malloc");
1847 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1848 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1849 if (dump_info->p == NULL)
1850 error("%s", pcap_geterr(pd));
1851 }
1852
1853 pcap_dump((u_char *)dump_info->p, h, sp);
1854 #ifdef HAVE_PCAP_DUMP_FLUSH
1855 if (Uflag)
1856 pcap_dump_flush(dump_info->p);
1857 #endif
1858
1859 --infodelay;
1860 if (infoprint)
1861 info(0);
1862 }
1863
1864 static void
1865 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1866 {
1867 ++packets_captured;
1868
1869 ++infodelay;
1870
1871 pcap_dump(user, h, sp);
1872 #ifdef HAVE_PCAP_DUMP_FLUSH
1873 if (Uflag)
1874 pcap_dump_flush((pcap_dumper_t *)user);
1875 #endif
1876
1877 --infodelay;
1878 if (infoprint)
1879 info(0);
1880 }
1881
1882 static void
1883 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1884 {
1885 struct print_info *print_info;
1886 u_int hdrlen;
1887
1888 ++packets_captured;
1889
1890 ++infodelay;
1891 ts_print(&h->ts);
1892
1893 print_info = (struct print_info *)user;
1894
1895 /*
1896 * Some printers want to check that they're not walking off the
1897 * end of the packet.
1898 * Rather than pass it all the way down, we set this global.
1899 */
1900 snapend = sp + h->caplen;
1901
1902 if(print_info->ndo_type) {
1903 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1904 } else {
1905 hdrlen = (*print_info->p.printer)(h, sp);
1906 }
1907
1908 if (Xflag) {
1909 /*
1910 * Print the raw packet data in hex and ASCII.
1911 */
1912 if (Xflag > 1) {
1913 /*
1914 * Include the link-layer header.
1915 */
1916 hex_and_ascii_print("\n\t", sp, h->caplen);
1917 } else {
1918 /*
1919 * Don't include the link-layer header - and if
1920 * we have nothing past the link-layer header,
1921 * print nothing.
1922 */
1923 if (h->caplen > hdrlen)
1924 hex_and_ascii_print("\n\t", sp + hdrlen,
1925 h->caplen - hdrlen);
1926 }
1927 } else if (xflag) {
1928 /*
1929 * Print the raw packet data in hex.
1930 */
1931 if (xflag > 1) {
1932 /*
1933 * Include the link-layer header.
1934 */
1935 hex_print("\n\t", sp, h->caplen);
1936 } else {
1937 /*
1938 * Don't include the link-layer header - and if
1939 * we have nothing past the link-layer header,
1940 * print nothing.
1941 */
1942 if (h->caplen > hdrlen)
1943 hex_print("\n\t", sp + hdrlen,
1944 h->caplen - hdrlen);
1945 }
1946 } else if (Aflag) {
1947 /*
1948 * Print the raw packet data in ASCII.
1949 */
1950 if (Aflag > 1) {
1951 /*
1952 * Include the link-layer header.
1953 */
1954 ascii_print(sp, h->caplen);
1955 } else {
1956 /*
1957 * Don't include the link-layer header - and if
1958 * we have nothing past the link-layer header,
1959 * print nothing.
1960 */
1961 if (h->caplen > hdrlen)
1962 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1963 }
1964 }
1965
1966 putchar('\n');
1967
1968 --infodelay;
1969 if (infoprint)
1970 info(0);
1971 }
1972
1973 #ifdef WIN32
1974 /*
1975 * XXX - there should really be libpcap calls to get the version
1976 * number as a string (the string would be generated from #defines
1977 * at run time, so that it's not generated from string constants
1978 * in the library, as, on many UNIX systems, those constants would
1979 * be statically linked into the application executable image, and
1980 * would thus reflect the version of libpcap on the system on
1981 * which the application was *linked*, not the system on which it's
1982 * *running*.
1983 *
1984 * That routine should be documented, unlike the "version[]"
1985 * string, so that UNIX vendors providing their own libpcaps
1986 * don't omit it (as a couple of vendors have...).
1987 *
1988 * Packet.dll should perhaps also export a routine to return the
1989 * version number of the Packet.dll code, to supply the
1990 * "Wpcap_version" information on Windows.
1991 */
1992 char WDversion[]="current-cvs.tcpdump.org";
1993 #if !defined(HAVE_GENERATED_VERSION)
1994 char version[]="current-cvs.tcpdump.org";
1995 #endif
1996 char pcap_version[]="current-cvs.tcpdump.org";
1997 char Wpcap_version[]="3.1";
1998 #endif
1999
2000 /*
2001 * By default, print the specified data out in hex and ASCII.
2002 */
2003 static void
2004 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
2005 {
2006 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
2007 }
2008
2009 void
2010 default_print(const u_char *bp, u_int length)
2011 {
2012 ndo_default_print(gndo, bp, length);
2013 }
2014
2015 #ifdef SIGNAL_REQ_INFO
2016 RETSIGTYPE requestinfo(int signo _U_)
2017 {
2018 if (infodelay)
2019 ++infoprint;
2020 else
2021 info(0);
2022 }
2023 #endif
2024
2025 /*
2026 * Called once each second in verbose mode while dumping to file
2027 */
2028 #ifdef USE_WIN32_MM_TIMER
2029 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2030 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2031 {
2032 struct pcap_stat stat;
2033
2034 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2035 fprintf(stderr, "Got %u\r", packets_captured);
2036 }
2037 #elif defined(HAVE_ALARM)
2038 static void verbose_stats_dump(int sig _U_)
2039 {
2040 struct pcap_stat stat;
2041
2042 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2043 fprintf(stderr, "Got %u\r", packets_captured);
2044 alarm(1);
2045 }
2046 #endif
2047
2048 static void
2049 usage(void)
2050 {
2051 extern char version[];
2052 #ifndef HAVE_PCAP_LIB_VERSION
2053 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2054 extern char pcap_version[];
2055 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2056 static char pcap_version[] = "unknown";
2057 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2058 #endif /* HAVE_PCAP_LIB_VERSION */
2059
2060 #ifdef HAVE_PCAP_LIB_VERSION
2061 #ifdef WIN32
2062 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2063 #else /* WIN32 */
2064 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2065 #endif /* WIN32 */
2066 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2067 #else /* HAVE_PCAP_LIB_VERSION */
2068 #ifdef WIN32
2069 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2070 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2071 #else /* WIN32 */
2072 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2073 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2074 #endif /* WIN32 */
2075 #endif /* HAVE_PCAP_LIB_VERSION */
2076 (void)fprintf(stderr,
2077 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2078 (void)fprintf(stderr,
2079 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2080 (void)fprintf(stderr,
2081 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
2082 (void)fprintf(stderr,
2083 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
2084 (void)fprintf(stderr,
2085 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2086 (void)fprintf(stderr,
2087 "\t\t[ -Z user ] [ expression ]\n");
2088 exit(1);
2089 }
2090
2091
2092
2093 /* VARARGS */
2094 static void
2095 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2096 {
2097 va_list ap;
2098
2099 (void)fprintf(stderr, "%s: ", program_name);
2100 va_start(ap, fmt);
2101 (void)vfprintf(stderr, fmt, ap);
2102 va_end(ap);
2103 if (*fmt) {
2104 fmt += strlen(fmt);
2105 if (fmt[-1] != '\n')
2106 (void)fputc('\n', stderr);
2107 }
2108 exit(1);
2109 /* NOTREACHED */
2110 }
2111
2112 /* VARARGS */
2113 static void
2114 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2115 {
2116 va_list ap;
2117
2118 (void)fprintf(stderr, "%s: WARNING: ", program_name);
2119 va_start(ap, fmt);
2120 (void)vfprintf(stderr, fmt, ap);
2121 va_end(ap);
2122 if (*fmt) {
2123 fmt += strlen(fmt);
2124 if (fmt[-1] != '\n')
2125 (void)fputc('\n', stderr);
2126 }
2127 }
[mirror] the TCPdump network dissector