]> The Tcpdump Group git mirrors - tcpdump/blob - tcpdump.c
projects / tcpdump / blob
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
Clean up Capsicum rights setting a bit.
[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 #endif
33
34 /*
35 * tcpdump - monitor tcp/ip traffic on an ethernet.
36 *
37 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
38 * Mercilessly hacked and occasionally improved since then via the
39 * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
40 */
41
42 #ifdef HAVE_CONFIG_H
43 #include "config.h"
44 #endif
45
46 /*
47 * Mac OS X may ship pcap.h from libpcap 0.6 with a libpcap based on
48 * 0.8. That means it has pcap_findalldevs() but the header doesn't
49 * define pcap_if_t, meaning that we can't actually *use* pcap_findalldevs().
50 */
51 #ifdef HAVE_PCAP_FINDALLDEVS
52 #ifndef HAVE_PCAP_IF_T
53 #undef HAVE_PCAP_FINDALLDEVS
54 #endif
55 #endif
56
57 #include <tcpdump-stdinc.h>
58
59 #ifdef WIN32
60 #include "w32_fzs.h"
61 extern int strcasecmp (const char *__s1, const char *__s2);
62 extern int SIZE_BUF;
63 #define off_t long
64 #define uint UINT
65 #endif /* WIN32 */
66
67 #ifdef USE_LIBSMI
68 #include <smi.h>
69 #endif
70
71 #ifdef HAVE_LIBCRYPTO
72 #include <openssl/crypto.h>
73 #endif
74
75 #ifdef HAVE_GETOPT_LONG
76 #include <getopt.h>
77 #else
78 #include "getopt_long.h"
79 #endif
80 /* Capsicum-specific code requires macros from <net/bpf.h>, which will fail
81 * to compile if <pcap.h> has already been included; including the headers
82 * in the opposite order works fine.
83 */
84 #ifdef HAVE_CAPSICUM
85 #include <sys/capability.h>
86 #include <sys/ioccom.h>
87 #include <net/bpf.h>
88 #include <fcntl.h>
89 #include <libgen.h>
90 #endif /* HAVE_CAPSICUM */
91 #include <pcap.h>
92 #include <signal.h>
93 #include <stdio.h>
94 #include <stdlib.h>
95 #include <string.h>
96 #include <limits.h>
97 #ifndef WIN32
98 #include <sys/wait.h>
99 #include <sys/resource.h>
100 #include <pwd.h>
101 #include <grp.h>
102 #endif /* WIN32 */
103
104 /* capabilities convenience library */
105 /* If a code depends on HAVE_LIBCAP_NG, it depends also on HAVE_CAP_NG_H.
106 * If HAVE_CAP_NG_H is not defined, undefine HAVE_LIBCAP_NG.
107 * Thus, the later tests are done only on HAVE_LIBCAP_NG.
108 */
109 #ifdef HAVE_LIBCAP_NG
110 #ifdef HAVE_CAP_NG_H
111 #include <cap-ng.h>
112 #else
113 #undef HAVE_LIBCAP_NG
114 #endif /* HAVE_CAP_NG_H */
115 #endif /* HAVE_LIBCAP_NG */
116
117 #include "netdissect.h"
118 #include "interface.h"
119 #include "addrtoname.h"
120 #include "machdep.h"
121 #include "setsignal.h"
122 #include "gmt2local.h"
123 #include "pcap-missing.h"
124
125 #ifndef PATH_MAX
126 #define PATH_MAX 1024
127 #endif
128
129 #ifdef SIGINFO
130 #define SIGNAL_REQ_INFO SIGINFO
131 #elif SIGUSR1
132 #define SIGNAL_REQ_INFO SIGUSR1
133 #endif
134
135 netdissect_options Gndo;
136 netdissect_options *gndo = &Gndo;
137
138 static int Dflag; /* list available devices and exit */
139 static int dflag; /* print filter code */
140 static int Lflag; /* list available data link types and exit */
141 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
142 static int Jflag; /* list available time stamp types */
143 #endif
144 #ifdef HAVE_PCAP_SETDIRECTION
145 int Qflag = -1; /* restrict captured packet by send/receive direction */
146 #endif
147 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
148
149 static int infodelay;
150 static int infoprint;
151
152 char *program_name;
153
154 int32_t thiszone; /* seconds offset from gmt to local time */
155
156 /* Forwards */
157 static RETSIGTYPE cleanup(int);
158 static RETSIGTYPE child_cleanup(int);
159 static void print_version(void);
160 static void print_usage(void);
161 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
162
163 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
164 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
165 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
166 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
167 static void droproot(const char *, const char *);
168 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
169 __attribute__((noreturn))
170 #ifdef __ATTRIBUTE___FORMAT_OK
171 __attribute__((format (printf, 2, 3)))
172 #endif /* __ATTRIBUTE___FORMAT_OK */
173 ;
174 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...)
175 #ifdef __ATTRIBUTE___FORMAT_OK
176 __attribute__((format (printf, 2, 3)))
177 #endif /* __ATTRIBUTE___FORMAT_OK */
178 ;
179
180 #ifdef SIGNAL_REQ_INFO
181 RETSIGTYPE requestinfo(int);
182 #endif
183
184 #if defined(USE_WIN32_MM_TIMER)
185 #include <MMsystem.h>
186 static UINT timer_id;
187 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
188 #elif defined(HAVE_ALARM)
189 static void verbose_stats_dump(int sig);
190 #endif
191
192 static void info(int);
193 static u_int packets_captured;
194
195 struct printer {
196 if_printer f;
197 int type;
198 };
199
200
201 struct ndo_printer {
202 if_ndo_printer f;
203 int type;
204 };
205
206
207 static const struct printer printers[] = {
208 { NULL, 0 },
209 };
210
211 static const struct ndo_printer ndo_printers[] = {
212 { ether_if_print, DLT_EN10MB },
213 #ifdef DLT_IPNET
214 { ipnet_if_print, DLT_IPNET },
215 #endif
216 #ifdef DLT_IEEE802_15_4
217 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
218 #endif
219 #ifdef DLT_IEEE802_15_4_NOFCS
220 { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
221 #endif
222 #ifdef DLT_PPI
223 { ppi_if_print, DLT_PPI },
224 #endif
225 #ifdef DLT_NETANALYZER
226 { netanalyzer_if_print, DLT_NETANALYZER },
227 #endif
228 #ifdef DLT_NETANALYZER_TRANSPARENT
229 { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
230 #endif
231 #if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H)
232 { nflog_if_print, DLT_NFLOG},
233 #endif
234 #ifdef DLT_CIP
235 { cip_if_print, DLT_CIP },
236 #endif
237 #ifdef DLT_ATM_CLIP
238 { cip_if_print, DLT_ATM_CLIP },
239 #endif
240 #ifdef DLT_IP_OVER_FC
241 { ipfc_if_print, DLT_IP_OVER_FC },
242 #endif
243 { null_if_print, DLT_NULL },
244 #ifdef DLT_LOOP
245 { null_if_print, DLT_LOOP },
246 #endif
247 #ifdef DLT_APPLE_IP_OVER_IEEE1394
248 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
249 #endif
250 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
251 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
252 #endif
253 #ifdef DLT_LANE8023
254 { lane_if_print, DLT_LANE8023 },
255 #endif
256 { arcnet_if_print, DLT_ARCNET },
257 #ifdef DLT_ARCNET_LINUX
258 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
259 #endif
260 { raw_if_print, DLT_RAW },
261 #ifdef DLT_IPV4
262 { raw_if_print, DLT_IPV4 },
263 #endif
264 #ifdef DLT_IPV6
265 { raw_if_print, DLT_IPV6 },
266 #endif
267 #ifdef HAVE_PCAP_USB_H
268 #ifdef DLT_USB_LINUX
269 { usb_linux_48_byte_print, DLT_USB_LINUX},
270 #endif /* DLT_USB_LINUX */
271 #ifdef DLT_USB_LINUX_MMAPPED
272 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
273 #endif /* DLT_USB_LINUX_MMAPPED */
274 #endif /* HAVE_PCAP_USB_H */
275 #ifdef DLT_SYMANTEC_FIREWALL
276 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
277 #endif
278 #ifdef DLT_C_HDLC
279 { chdlc_if_print, DLT_C_HDLC },
280 #endif
281 #ifdef DLT_HDLC
282 { chdlc_if_print, DLT_HDLC },
283 #endif
284 #ifdef DLT_PPP_ETHER
285 { pppoe_if_print, DLT_PPP_ETHER },
286 #endif
287 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
288 { pflog_if_print, DLT_PFLOG },
289 #endif
290 { token_if_print, DLT_IEEE802 },
291 { fddi_if_print, DLT_FDDI },
292 #ifdef DLT_LINUX_SLL
293 { sll_if_print, DLT_LINUX_SLL },
294 #endif
295 #ifdef DLT_FR
296 { fr_if_print, DLT_FR },
297 #endif
298 #ifdef DLT_FRELAY
299 { fr_if_print, DLT_FRELAY },
300 #endif
301 #ifdef DLT_MFR
302 { mfr_if_print, DLT_MFR },
303 #endif
304 { atm_if_print, DLT_ATM_RFC1483 },
305 #ifdef DLT_SUNATM
306 { sunatm_if_print, DLT_SUNATM },
307 #endif
308 #ifdef DLT_ENC
309 { enc_if_print, DLT_ENC },
310 #endif
311 { sl_if_print, DLT_SLIP },
312 #ifdef DLT_SLIP_BSDOS
313 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
314 #endif
315 #ifdef DLT_LTALK
316 { ltalk_if_print, DLT_LTALK },
317 #endif
318 #ifdef DLT_JUNIPER_ATM1
319 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
320 #endif
321 #ifdef DLT_JUNIPER_ATM2
322 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
323 #endif
324 #ifdef DLT_JUNIPER_MFR
325 { juniper_mfr_print, DLT_JUNIPER_MFR },
326 #endif
327 #ifdef DLT_JUNIPER_MLFR
328 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
329 #endif
330 #ifdef DLT_JUNIPER_MLPPP
331 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
332 #endif
333 #ifdef DLT_JUNIPER_PPPOE
334 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
335 #endif
336 #ifdef DLT_JUNIPER_PPPOE_ATM
337 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
338 #endif
339 #ifdef DLT_JUNIPER_GGSN
340 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
341 #endif
342 #ifdef DLT_JUNIPER_ES
343 { juniper_es_print, DLT_JUNIPER_ES },
344 #endif
345 #ifdef DLT_JUNIPER_MONITOR
346 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
347 #endif
348 #ifdef DLT_JUNIPER_SERVICES
349 { juniper_services_print, DLT_JUNIPER_SERVICES },
350 #endif
351 #ifdef DLT_JUNIPER_ETHER
352 { juniper_ether_print, DLT_JUNIPER_ETHER },
353 #endif
354 #ifdef DLT_JUNIPER_PPP
355 { juniper_ppp_print, DLT_JUNIPER_PPP },
356 #endif
357 #ifdef DLT_JUNIPER_FRELAY
358 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
359 #endif
360 #ifdef DLT_JUNIPER_CHDLC
361 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
362 #endif
363 #ifdef DLT_PKTAP
364 { pktap_if_print, DLT_PKTAP },
365 #endif
366 #ifdef DLT_IEEE802_11_RADIO
367 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
368 #endif
369 #ifdef DLT_IEEE802_11
370 { ieee802_11_if_print, DLT_IEEE802_11},
371 #endif
372 #ifdef DLT_IEEE802_11_RADIO_AVS
373 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
374 #endif
375 #ifdef DLT_PRISM_HEADER
376 { prism_if_print, DLT_PRISM_HEADER },
377 #endif
378 { ppp_if_print, DLT_PPP },
379 #ifdef DLT_PPP_WITHDIRECTION
380 { ppp_if_print, DLT_PPP_WITHDIRECTION },
381 #endif
382 #ifdef DLT_PPP_BSDOS
383 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
384 #endif
385 #ifdef DLT_PPP_SERIAL
386 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
387 #endif
388 { NULL, 0 },
389 };
390
391 static const struct tok status_flags[] = {
392 #ifdef PCAP_IF_UP
393 { PCAP_IF_UP, "Up" },
394 #endif
395 #ifdef PCAP_IF_RUNNING
396 { PCAP_IF_RUNNING, "Running" },
397 #endif
398 { PCAP_IF_LOOPBACK, "Loopback" },
399 { 0, NULL }
400 };
401
402 if_printer
403 lookup_printer(int type)
404 {
405 const struct printer *p;
406
407 for (p = printers; p->f; ++p)
408 if (type == p->type)
409 return p->f;
410
411 return NULL;
412 /* NOTREACHED */
413 }
414
415 if_ndo_printer
416 lookup_ndo_printer(int type)
417 {
418 const struct ndo_printer *p;
419
420 for (p = ndo_printers; p->f; ++p)
421 if (type == p->type)
422 return p->f;
423
424 #if defined(DLT_USER2) && defined(DLT_PKTAP)
425 /*
426 * Apple incorrectly chose to use DLT_USER2 for their PKTAP
427 * header.
428 *
429 * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
430 * based OSes or the same value as LINKTYPE_PKTAP as it is on
431 * other OSes, to LINKTYPE_PKTAP, so files written with
432 * this version of libpcap for a DLT_PKTAP capture have a link-
433 * layer header type of LINKTYPE_PKTAP.
434 *
435 * However, files written on OS X Mavericks for a DLT_PKTAP
436 * capture have a link-layer header type of LINKTYPE_USER2.
437 * If we don't have a printer for DLT_USER2, and type is
438 * DLT_USER2, we look up the printer for DLT_PKTAP and use
439 * that.
440 */
441 if (type == DLT_USER2) {
442 for (p = ndo_printers; p->f; ++p)
443 if (DLT_PKTAP == p->type)
444 return p->f;
445 }
446 #endif
447
448 return NULL;
449 /* NOTREACHED */
450 }
451
452 static pcap_t *pd;
453
454 static int supports_monitor_mode;
455
456 extern int optind;
457 extern int opterr;
458 extern char *optarg;
459
460 struct print_info {
461 netdissect_options *ndo;
462 union {
463 if_printer printer;
464 if_ndo_printer ndo_printer;
465 } p;
466 int ndo_type;
467 };
468
469 struct dump_info {
470 char *WFileName;
471 char *CurrentFileName;
472 pcap_t *pd;
473 pcap_dumper_t *p;
474 #ifdef HAVE_CAPSICUM
475 int dirfd;
476 #endif
477 };
478
479 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
480 static void
481 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
482 {
483 int n_tstamp_types;
484 int *tstamp_types = 0;
485 const char *tstamp_type_name;
486 int i;
487
488 n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
489 if (n_tstamp_types < 0)
490 error("%s", pcap_geterr(pd));
491
492 if (n_tstamp_types == 0) {
493 fprintf(stderr, "Time stamp type cannot be set for %s\n",
494 device);
495 exit(0);
496 }
497 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
498 device);
499 for (i = 0; i < n_tstamp_types; i++) {
500 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
501 if (tstamp_type_name != NULL) {
502 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
503 pcap_tstamp_type_val_to_description(tstamp_types[i]));
504 } else {
505 (void) fprintf(stderr, " %d\n", tstamp_types[i]);
506 }
507 }
508 pcap_free_tstamp_types(tstamp_types);
509 exit(0);
510 }
511 #endif
512
513 static void
514 show_dlts_and_exit(const char *device, pcap_t *pd)
515 {
516 int n_dlts;
517 int *dlts = 0;
518 const char *dlt_name;
519
520 n_dlts = pcap_list_datalinks(pd, &dlts);
521 if (n_dlts < 0)
522 error("%s", pcap_geterr(pd));
523 else if (n_dlts == 0 || !dlts)
524 error("No data link types.");
525
526 /*
527 * If the interface is known to support monitor mode, indicate
528 * whether these are the data link types available when not in
529 * monitor mode, if -I wasn't specified, or when in monitor mode,
530 * when -I was specified (the link-layer types available in
531 * monitor mode might be different from the ones available when
532 * not in monitor mode).
533 */
534 if (supports_monitor_mode)
535 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
536 device,
537 Iflag ? "when in monitor mode" : "when not in monitor mode");
538 else
539 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
540 device);
541
542 while (--n_dlts >= 0) {
543 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
544 if (dlt_name != NULL) {
545 (void) fprintf(stderr, " %s (%s)", dlt_name,
546 pcap_datalink_val_to_description(dlts[n_dlts]));
547
548 /*
549 * OK, does tcpdump handle that type?
550 */
551 if (lookup_printer(dlts[n_dlts]) == NULL
552 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
553 (void) fprintf(stderr, " (printing not supported)");
554 fprintf(stderr, "\n");
555 } else {
556 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
557 dlts[n_dlts]);
558 }
559 }
560 #ifdef HAVE_PCAP_FREE_DATALINKS
561 pcap_free_datalinks(dlts);
562 #endif
563 exit(0);
564 }
565
566 #ifdef HAVE_PCAP_FINDALLDEVS
567 static void
568 show_devices_and_exit (void)
569 {
570 pcap_if_t *devpointer;
571 char ebuf[PCAP_ERRBUF_SIZE];
572 int i;
573
574 if (pcap_findalldevs(&devpointer, ebuf) < 0)
575 error("%s", ebuf);
576 else {
577 for (i = 0; devpointer != NULL; i++) {
578 printf("%d.%s", i+1, devpointer->name);
579 if (devpointer->description != NULL)
580 printf(" (%s)", devpointer->description);
581 if (devpointer->flags != 0)
582 printf(" [%s]", bittok2str(status_flags, "none", devpointer->flags));
583 printf("\n");
584 devpointer = devpointer->next;
585 }
586 }
587 exit(0);
588 }
589 #endif /* HAVE_PCAP_FINDALLDEVS */
590
591 /*
592 * Short options.
593 *
594 * Note that there we use all letters for short options except for g, k,
595 * o, and P, and those are used by other versions of tcpdump, and we should
596 * only use them for the same purposes that the other versions of tcpdump
597 * use them:
598 *
599 * OS X tcpdump uses -g to force non--v output for IP to be on one
600 * line, making it more "g"repable;
601 *
602 * OS X tcpdump uses -k tospecify that packet comments in pcap-ng files
603 * should be printed;
604 *
605 * OpenBSD tcpdump uses -o to indicate that OS fingerprinting should be done
606 * for hosts sending TCP SYN packets;
607 *
608 * OS X tcpdump uses -P to indicate that -w should write pcap-ng rather
609 * than pcap files.
610 *
611 * OS X tcpdump also uses -Q to specify expressions that match packet
612 * metadata, including but not limited to the packet direction.
613 * The expression syntax is different from a simple "in|out|inout",
614 * and those expressions aren't accepted by OS X tcpdump, but the
615 * equivalents would be "in" = "dir=in", "out" = "dir=out", and
616 * "inout" = "dir=in or dir=out", and the parser could conceivably
617 * special-case "in", "out", and "inout" as expressions for backwards
618 * compatibility, so all is not (yet) lost.
619 */
620
621 /*
622 * Set up flags that might or might not be supported depending on the
623 * version of libpcap we're using.
624 */
625 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
626 #define B_FLAG "B:"
627 #define B_FLAG_USAGE " [ -B size ]"
628 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
629 #define B_FLAG
630 #define B_FLAG_USAGE
631 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
632
633 #ifdef HAVE_PCAP_CREATE
634 #define I_FLAG "I"
635 #else /* HAVE_PCAP_CREATE */
636 #define I_FLAG
637 #endif /* HAVE_PCAP_CREATE */
638
639 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
640 #define j_FLAG "j:"
641 #define j_FLAG_USAGE " [ -j tstamptype ]"
642 #define J_FLAG "J"
643 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
644 #define j_FLAG
645 #define j_FLAG_USAGE
646 #define J_FLAG
647 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
648
649 #ifdef HAVE_PCAP_FINDALLDEVS
650 #define D_FLAG "D"
651 #else
652 #define D_FLAG
653 #endif
654
655 #ifdef HAVE_PCAP_DUMP_FLUSH
656 #define U_FLAG "U"
657 #else
658 #define U_FLAG
659 #endif
660
661 #ifdef HAVE_PCAP_SETDIRECTION
662 #define Q_FLAG "Q:"
663 #else
664 #define Q_FLAG
665 #endif
666
667 #define SHORTOPTS "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpq" Q_FLAG "r:Rs:StT:u" U_FLAG "vV:w:W:xXy:Yz:Z:#"
668
669 /*
670 * Long options.
671 *
672 * We do not currently have long options corresponding to all short
673 * options; we should probably pick appropriate option names for them.
674 *
675 * However, the short options where the number of times the option is
676 * specified matters, such as -v and -d and -t, should probably not
677 * just map to a long option, as saying
678 *
679 * tcpdump --verbose --verbose
680 *
681 * doesn't make sense; it should be --verbosity={N} or something such
682 * as that.
683 *
684 * For long options with no corresponding short options, we define values
685 * outside the range of ASCII graphic characters, make that the last
686 * component of the entry for the long option, and have a case for that
687 * option in the switch statement.
688 */
689 #define OPTION_VERSION 128
690 #define OPTION_TSTAMP_PRECISION 129
691 #define OPTION_IMMEDIATE_MODE 130
692
693 static const struct option longopts[] = {
694 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
695 { "buffer-size", required_argument, NULL, 'B' },
696 #endif
697 { "list-interfaces", no_argument, NULL, 'D' },
698 { "help", no_argument, NULL, 'h' },
699 { "interface", required_argument, NULL, 'i' },
700 #ifdef HAVE_PCAP_CREATE
701 { "monitor-mode", no_argument, NULL, 'I' },
702 #endif
703 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
704 { "time-stamp-type", required_argument, NULL, 'j' },
705 { "list-time-stamp-types", no_argument, NULL, 'J' },
706 #endif
707 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
708 { "time-stamp-precision", required_argument, NULL, OPTION_TSTAMP_PRECISION},
709 #endif
710 { "dont-verify-checksums", no_argument, NULL, 'K' },
711 { "list-data-link-types", no_argument, NULL, 'L' },
712 { "no-optimize", no_argument, NULL, 'O' },
713 { "no-promiscuous-mode", no_argument, NULL, 'p' },
714 #ifdef HAVE_PCAP_SETDIRECTION
715 { "direction", required_argument, NULL, 'Q' },
716 #endif
717 { "snapshot-length", required_argument, NULL, 's' },
718 { "absolute-tcp-sequence-numbers", no_argument, NULL, 'S' },
719 #ifdef HAVE_PCAP_DUMP_FLUSH
720 { "packet-buffered", no_argument, NULL, 'U' },
721 #endif
722 { "linktype", required_argument, NULL, 'y' },
723 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
724 { "immediate-mode", no_argument, NULL, OPTION_IMMEDIATE_MODE },
725 #endif
726 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
727 { "debug-filter-parser", no_argument, NULL, 'Y' },
728 #endif
729 { "relinquish-privileges", required_argument, NULL, 'Z' },
730 { "number", no_argument, NULL, '#' },
731 { "version", no_argument, NULL, OPTION_VERSION },
732 { NULL, 0, NULL, 0 }
733 };
734
735 #ifndef WIN32
736 /* Drop root privileges and chroot if necessary */
737 static void
738 droproot(const char *username, const char *chroot_dir)
739 {
740 struct passwd *pw = NULL;
741
742 if (chroot_dir && !username) {
743 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
744 exit(1);
745 }
746
747 pw = getpwnam(username);
748 if (pw) {
749 if (chroot_dir) {
750 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
751 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
752 chroot_dir, pcap_strerror(errno));
753 exit(1);
754 }
755 }
756 #ifdef HAVE_LIBCAP_NG
757 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
758 if (ret < 0) {
759 fprintf(stderr, "error : ret %d\n", ret);
760 }
761 else {
762 fprintf(stderr, "dropped privs to %s\n", username);
763 }
764 #else
765 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
766 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
767 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
768 username,
769 (unsigned long)pw->pw_uid,
770 (unsigned long)pw->pw_gid,
771 pcap_strerror(errno));
772 exit(1);
773 }
774 else {
775 fprintf(stderr, "dropped privs to %s\n", username);
776 }
777 #endif /* HAVE_LIBCAP_NG */
778 }
779 else {
780 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
781 username);
782 exit(1);
783 }
784 #ifdef HAVE_LIBCAP_NG
785 /* We don't need CAP_SETUID and CAP_SETGID any more. */
786 capng_updatev(
787 CAPNG_DROP,
788 CAPNG_EFFECTIVE | CAPNG_PERMITTED,
789 CAP_SETUID,
790 CAP_SETGID,
791 -1);
792 capng_apply(CAPNG_SELECT_BOTH);
793 #endif /* HAVE_LIBCAP_NG */
794
795 }
796 #endif /* WIN32 */
797
798 static int
799 getWflagChars(int x)
800 {
801 int c = 0;
802
803 x -= 1;
804 while (x > 0) {
805 c += 1;
806 x /= 10;
807 }
808
809 return c;
810 }
811
812
813 static void
814 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
815 {
816 char *filename = malloc(PATH_MAX + 1);
817 if (filename == NULL)
818 error("Makefilename: malloc");
819
820 /* Process with strftime if Gflag is set. */
821 if (Gflag != 0) {
822 struct tm *local_tm;
823
824 /* Convert Gflag_time to a usable format */
825 if ((local_tm = localtime(&Gflag_time)) == NULL) {
826 error("MakeTimedFilename: localtime");
827 }
828
829 /* There's no good way to detect an error in strftime since a return
830 * value of 0 isn't necessarily failure.
831 */
832 strftime(filename, PATH_MAX, orig_name, local_tm);
833 } else {
834 strncpy(filename, orig_name, PATH_MAX);
835 }
836
837 if (cnt == 0 && max_chars == 0)
838 strncpy(buffer, filename, PATH_MAX + 1);
839 else
840 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
841 /* Report an error if the filename is too large */
842 error("too many output files or filename is too long (> %d)", PATH_MAX);
843 free(filename);
844 }
845
846 static int tcpdump_printf(netdissect_options *ndo _U_,
847 const char *fmt, ...)
848 {
849
850 va_list args;
851 int ret;
852
853 va_start(args, fmt);
854 ret=vfprintf(stdout, fmt, args);
855 va_end(args);
856
857 return ret;
858 }
859
860 static struct print_info
861 get_print_info(int type)
862 {
863 struct print_info printinfo;
864
865 printinfo.ndo_type = 1;
866 printinfo.ndo = gndo;
867 printinfo.p.ndo_printer = lookup_ndo_printer(type);
868 if (printinfo.p.ndo_printer == NULL) {
869 printinfo.p.printer = lookup_printer(type);
870 printinfo.ndo_type = 0;
871 if (printinfo.p.printer == NULL) {
872 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
873 if (gndo->ndo_dltname != NULL)
874 error("packet printing is not supported for link type %s: use -w",
875 gndo->ndo_dltname);
876 else
877 error("packet printing is not supported for link type %d: use -w", type);
878 }
879 }
880 return (printinfo);
881 }
882
883 static char *
884 get_next_file(FILE *VFile, char *ptr)
885 {
886 char *ret;
887
888 ret = fgets(ptr, PATH_MAX, VFile);
889 if (!ret)
890 return NULL;
891
892 if (ptr[strlen(ptr) - 1] == '\n')
893 ptr[strlen(ptr) - 1] = '\0';
894
895 return ret;
896 }
897
898 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
899 static int
900 tstamp_precision_from_string(const char *precision)
901 {
902 if (strncmp(precision, "nano", strlen("nano")) == 0)
903 return PCAP_TSTAMP_PRECISION_NANO;
904
905 if (strncmp(precision, "micro", strlen("micro")) == 0)
906 return PCAP_TSTAMP_PRECISION_MICRO;
907
908 return -EINVAL;
909 }
910
911 static const char *
912 tstamp_precision_to_string(int precision)
913 {
914 switch (precision) {
915
916 case PCAP_TSTAMP_PRECISION_MICRO:
917 return "micro";
918
919 case PCAP_TSTAMP_PRECISION_NANO:
920 return "nano";
921
922 default:
923 return "unknown";
924 }
925 }
926 #endif
927
928 #ifdef HAVE_CAPSICUM
929 /*
930 * Ensure that, on a dump file's descriptor, we have all the rights
931 * necessary to make the standard I/O library work with an fdopen()ed
932 * FILE * from that descriptor.
933 *
934 * A long time ago, in a galaxy far far away, AT&T decided that, instead
935 * of providing separate APIs for getting and setting the FD_ flags on a
936 * descriptor, getting and setting the O_ flags on a descriptor, and
937 * locking files, they'd throw them all into a kitchen-sink fcntl() call
938 * along the lines of ioctl(), the fact that ioctl() operations are
939 * largely specific to particular character devices but fcntl() operations
940 * are either generic to all descriptors or generic to all descriptors for
941 * regular files nonwithstanding.
942 *
943 * The Capsicum people decided that fine-grained control of descriptor
944 * operations was required, so that you need to grant permission for
945 * reading, writing, seeking, and fcntl-ing. The latter, courtesy of
946 * AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley
947 * collection of things, so there are *individual* fcntls for which
948 * permission needs to be granted.
949 *
950 * The FreeBSD standard I/O people implemented some optimizations that
951 * requires that the standard I/O routines be able to determine whether
952 * the descriptor for the FILE * is open append-only or not; as that
953 * descriptor could have come from an open() rather than an fopen(),
954 * that requires that it be able to do an F_GETFL fcntl() to read
955 * the O_ flags.
956 *
957 * Tcpdump uses ftell() to determine how much data has been written
958 * to a file in order to, when used with -C, determine when it's time
959 * to rotate capture files. ftell() therefore needs to do an lseek()
960 * to find out the file offset and must, thanks to the aforementioned
961 * optimization, also know whether the descriptor is open append-only
962 * or not.
963 *
964 * The net result of all the above is that we need to grant CAP_SEEK,
965 * CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability.
966 *
967 * Perhaps this is the universe's way of saying that either
968 *
969 * 1) there needs to be an fopenat() call and a pcap_dump_openat() call
970 * using it, so that Capsicum-capable tcpdump wouldn't need to do
971 * an fdopen()
972 *
973 * or
974 *
975 * 2) there needs to be a cap_fdopen() call in the FreeBSD standard
976 * I/O library that knows what rights are needed by the standard
977 * I/O library, based on the open mode, and assigns them, perhaps
978 * with an additional argument indicating, for example, whether
979 * seeking should be allowed, so that tcpdump doesn't need to know
980 * what the standard I/O library happens to require this week.
981 */
982 static void
983 set_dumper_capsicum_rights(pcap_dumper_t *p)
984 {
985 int fd = fileno(pcap_dump_file(p));
986 cap_rights_t rights;
987
988 cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL);
989 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
990 error("unable to limit dump descriptor");
991 }
992 if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) {
993 error("unable to limit dump descriptor fcntls");
994 }
995 }
996 #endif
997
998 int
999 main(int argc, char **argv)
1000 {
1001 register int cnt, op, i;
1002 bpf_u_int32 localnet =0 , netmask = 0;
1003 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
1004 pcap_handler callback;
1005 int type;
1006 int dlt;
1007 int new_dlt;
1008 const char *dlt_name;
1009 struct bpf_program fcode;
1010 #ifndef WIN32
1011 RETSIGTYPE (*oldhandler)(int);
1012 #endif
1013 struct print_info printinfo;
1014 struct dump_info dumpinfo;
1015 u_char *pcap_userdata;
1016 char ebuf[PCAP_ERRBUF_SIZE];
1017 char VFileLine[PATH_MAX + 1];
1018 char *username = NULL;
1019 char *chroot_dir = NULL;
1020 char *ret = NULL;
1021 char *end;
1022 #ifdef HAVE_PCAP_FINDALLDEVS
1023 pcap_if_t *devpointer;
1024 int devnum;
1025 #endif
1026 int status;
1027 FILE *VFile;
1028 #ifdef HAVE_CAPSICUM
1029 cap_rights_t rights;
1030 int cansandbox;
1031 #endif /* HAVE_CAPSICUM */
1032
1033 #ifdef WIN32
1034 if(wsockinit() != 0) return 1;
1035 #endif /* WIN32 */
1036
1037 jflag=-1; /* not set */
1038 gndo->ndo_Oflag=1;
1039 gndo->ndo_Rflag=1;
1040 gndo->ndo_dlt=-1;
1041 gndo->ndo_default_print=ndo_default_print;
1042 gndo->ndo_printf=tcpdump_printf;
1043 gndo->ndo_error=ndo_error;
1044 gndo->ndo_warning=ndo_warning;
1045 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
1046 gndo->ndo_immediate = 0;
1047
1048 cnt = -1;
1049 device = NULL;
1050 infile = NULL;
1051 RFileName = NULL;
1052 VFileName = NULL;
1053 VFile = NULL;
1054 WFileName = NULL;
1055 dlt = -1;
1056 if ((cp = strrchr(argv[0], '/')) != NULL)
1057 program_name = cp + 1;
1058 else
1059 program_name = argv[0];
1060
1061 /*
1062 * On platforms where the CPU doesn't support unaligned loads,
1063 * force unaligned accesses to abort with SIGBUS, rather than
1064 * being fixed up (slowly) by the OS kernel; on those platforms,
1065 * misaligned accesses are bugs, and we want tcpdump to crash so
1066 * that the bugs are reported.
1067 */
1068 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
1069 error("%s", ebuf);
1070
1071 #ifdef USE_LIBSMI
1072 smiInit("tcpdump");
1073 #endif
1074
1075 while (
1076 (op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1)
1077 switch (op) {
1078
1079 case 'a':
1080 /* compatibility for old -a */
1081 break;
1082
1083 case 'A':
1084 ++Aflag;
1085 break;
1086
1087 case 'b':
1088 ++bflag;
1089 break;
1090
1091 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
1092 case 'B':
1093 Bflag = atoi(optarg)*1024;
1094 if (Bflag <= 0)
1095 error("invalid packet buffer size %s", optarg);
1096 break;
1097 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
1098
1099 case 'c':
1100 cnt = atoi(optarg);
1101 if (cnt <= 0)
1102 error("invalid packet count %s", optarg);
1103 break;
1104
1105 case 'C':
1106 Cflag = atoi(optarg) * 1000000;
1107 if (Cflag < 0)
1108 error("invalid file size %s", optarg);
1109 break;
1110
1111 case 'd':
1112 ++dflag;
1113 break;
1114
1115 case 'D':
1116 Dflag++;
1117 break;
1118
1119 case 'L':
1120 Lflag++;
1121 break;
1122
1123 case 'e':
1124 ++eflag;
1125 break;
1126
1127 case 'E':
1128 #ifndef HAVE_LIBCRYPTO
1129 warning("crypto code not compiled in");
1130 #endif
1131 gndo->ndo_espsecret = optarg;
1132 break;
1133
1134 case 'f':
1135 ++fflag;
1136 break;
1137
1138 case 'F':
1139 infile = optarg;
1140 break;
1141
1142 case 'G':
1143 Gflag = atoi(optarg);
1144 if (Gflag < 0)
1145 error("invalid number of seconds %s", optarg);
1146
1147 /* We will create one file initially. */
1148 Gflag_count = 0;
1149
1150 /* Grab the current time for rotation use. */
1151 if ((Gflag_time = time(NULL)) == (time_t)-1) {
1152 error("main: can't get current time: %s",
1153 pcap_strerror(errno));
1154 }
1155 break;
1156
1157 case 'h':
1158 print_usage();
1159 exit(0);
1160 break;
1161
1162 case 'H':
1163 ++Hflag;
1164 break;
1165
1166 case 'i':
1167 if (optarg[0] == '0' && optarg[1] == 0)
1168 error("Invalid adapter index");
1169
1170 #ifdef HAVE_PCAP_FINDALLDEVS
1171 /*
1172 * If the argument is a number, treat it as
1173 * an index into the list of adapters, as
1174 * printed by "tcpdump -D".
1175 *
1176 * This should be OK on UNIX systems, as interfaces
1177 * shouldn't have names that begin with digits.
1178 * It can be useful on Windows, where more than
1179 * one interface can have the same name.
1180 */
1181 devnum = strtol(optarg, &end, 10);
1182 if (optarg != end && *end == '\0') {
1183 if (devnum < 0)
1184 error("Invalid adapter index");
1185
1186 if (pcap_findalldevs(&devpointer, ebuf) < 0)
1187 error("%s", ebuf);
1188 else {
1189 /*
1190 * Look for the devnum-th entry
1191 * in the list of devices
1192 * (1-based).
1193 */
1194 for (i = 0;
1195 i < devnum-1 && devpointer != NULL;
1196 i++, devpointer = devpointer->next)
1197 ;
1198 if (devpointer == NULL)
1199 error("Invalid adapter index");
1200 }
1201 device = devpointer->name;
1202 break;
1203 }
1204 #endif /* HAVE_PCAP_FINDALLDEVS */
1205 device = optarg;
1206 break;
1207
1208 #ifdef HAVE_PCAP_CREATE
1209 case 'I':
1210 ++Iflag;
1211 break;
1212 #endif /* HAVE_PCAP_CREATE */
1213
1214 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1215 case 'j':
1216 jflag = pcap_tstamp_type_name_to_val(optarg);
1217 if (jflag < 0)
1218 error("invalid time stamp type %s", optarg);
1219 break;
1220
1221 case 'J':
1222 Jflag++;
1223 break;
1224 #endif
1225
1226 case 'l':
1227 #ifdef WIN32
1228 /*
1229 * _IOLBF is the same as _IOFBF in Microsoft's C
1230 * libraries; the only alternative they offer
1231 * is _IONBF.
1232 *
1233 * XXX - this should really be checking for MSVC++,
1234 * not WIN32, if, for example, MinGW has its own
1235 * C library that is more UNIX-compatible.
1236 */
1237 setvbuf(stdout, NULL, _IONBF, 0);
1238 #else /* WIN32 */
1239 #ifdef HAVE_SETLINEBUF
1240 setlinebuf(stdout);
1241 #else
1242 setvbuf(stdout, NULL, _IOLBF, 0);
1243 #endif
1244 #endif /* WIN32 */
1245 break;
1246
1247 case 'K':
1248 ++Kflag;
1249 break;
1250
1251 case 'm':
1252 #ifdef USE_LIBSMI
1253 if (smiLoadModule(optarg) == 0) {
1254 error("could not load MIB module %s", optarg);
1255 }
1256 sflag = 1;
1257 #else
1258 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
1259 program_name, optarg);
1260 (void)fprintf(stderr, "(no libsmi support)\n");
1261 #endif
1262 break;
1263
1264 case 'M':
1265 /* TCP-MD5 shared secret */
1266 #ifndef HAVE_LIBCRYPTO
1267 warning("crypto code not compiled in");
1268 #endif
1269 sigsecret = optarg;
1270 break;
1271
1272 case 'n':
1273 ++nflag;
1274 break;
1275
1276 case 'N':
1277 ++Nflag;
1278 break;
1279
1280 case 'O':
1281 Oflag = 0;
1282 break;
1283
1284 case 'p':
1285 ++pflag;
1286 break;
1287
1288 case 'q':
1289 ++qflag;
1290 ++suppress_default_print;
1291 break;
1292
1293 #ifdef HAVE_PCAP_SETDIRECTION
1294 case 'Q':
1295 if (strcasecmp(optarg, "in") == 0)
1296 Qflag = PCAP_D_IN;
1297 else if (strcasecmp(optarg, "out") == 0)
1298 Qflag = PCAP_D_OUT;
1299 else if (strcasecmp(optarg, "inout") == 0)
1300 Qflag = PCAP_D_INOUT;
1301 else
1302 error("unknown capture direction `%s'", optarg);
1303 break;
1304 #endif /* HAVE_PCAP_SETDIRECTION */
1305
1306 case 'r':
1307 RFileName = optarg;
1308 break;
1309
1310 case 'R':
1311 Rflag = 0;
1312 break;
1313
1314 case 's':
1315 snaplen = strtol(optarg, &end, 0);
1316 if (optarg == end || *end != '\0'
1317 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
1318 error("invalid snaplen %s", optarg);
1319 else if (snaplen == 0)
1320 snaplen = MAXIMUM_SNAPLEN;
1321 break;
1322
1323 case 'S':
1324 ++Sflag;
1325 break;
1326
1327 case 't':
1328 ++tflag;
1329 break;
1330
1331 case 'T':
1332 if (strcasecmp(optarg, "vat") == 0)
1333 packettype = PT_VAT;
1334 else if (strcasecmp(optarg, "wb") == 0)
1335 packettype = PT_WB;
1336 else if (strcasecmp(optarg, "rpc") == 0)
1337 packettype = PT_RPC;
1338 else if (strcasecmp(optarg, "rtp") == 0)
1339 packettype = PT_RTP;
1340 else if (strcasecmp(optarg, "rtcp") == 0)
1341 packettype = PT_RTCP;
1342 else if (strcasecmp(optarg, "snmp") == 0)
1343 packettype = PT_SNMP;
1344 else if (strcasecmp(optarg, "cnfp") == 0)
1345 packettype = PT_CNFP;
1346 else if (strcasecmp(optarg, "tftp") == 0)
1347 packettype = PT_TFTP;
1348 else if (strcasecmp(optarg, "aodv") == 0)
1349 packettype = PT_AODV;
1350 else if (strcasecmp(optarg, "carp") == 0)
1351 packettype = PT_CARP;
1352 else if (strcasecmp(optarg, "radius") == 0)
1353 packettype = PT_RADIUS;
1354 else if (strcasecmp(optarg, "zmtp1") == 0)
1355 packettype = PT_ZMTP1;
1356 else if (strcasecmp(optarg, "vxlan") == 0)
1357 packettype = PT_VXLAN;
1358 else if (strcasecmp(optarg, "pgm") == 0)
1359 packettype = PT_PGM;
1360 else if (strcasecmp(optarg, "pgm_zmtp1") == 0)
1361 packettype = PT_PGM_ZMTP1;
1362 else if (strcasecmp(optarg, "lmp") == 0)
1363 packettype = PT_LMP;
1364 else
1365 error("unknown packet type `%s'", optarg);
1366 break;
1367
1368 case 'u':
1369 ++uflag;
1370 break;
1371
1372 #ifdef HAVE_PCAP_DUMP_FLUSH
1373 case 'U':
1374 ++Uflag;
1375 break;
1376 #endif
1377
1378 case 'v':
1379 ++vflag;
1380 break;
1381
1382 case 'V':
1383 VFileName = optarg;
1384 break;
1385
1386 case 'w':
1387 WFileName = optarg;
1388 break;
1389
1390 case 'W':
1391 Wflag = atoi(optarg);
1392 if (Wflag < 0)
1393 error("invalid number of output files %s", optarg);
1394 WflagChars = getWflagChars(Wflag);
1395 break;
1396
1397 case 'x':
1398 ++xflag;
1399 ++suppress_default_print;
1400 break;
1401
1402 case 'X':
1403 ++Xflag;
1404 ++suppress_default_print;
1405 break;
1406
1407 case 'y':
1408 gndo->ndo_dltname = optarg;
1409 gndo->ndo_dlt =
1410 pcap_datalink_name_to_val(gndo->ndo_dltname);
1411 if (gndo->ndo_dlt < 0)
1412 error("invalid data link type %s", gndo->ndo_dltname);
1413 break;
1414
1415 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1416 case 'Y':
1417 {
1418 /* Undocumented flag */
1419 #ifdef HAVE_PCAP_DEBUG
1420 extern int pcap_debug;
1421 pcap_debug = 1;
1422 #else
1423 extern int yydebug;
1424 yydebug = 1;
1425 #endif
1426 }
1427 break;
1428 #endif
1429 case 'z':
1430 zflag = strdup(optarg);
1431 break;
1432
1433 case 'Z':
1434 username = strdup(optarg);
1435 break;
1436
1437 case '#':
1438 gndo->ndo_packet_number = 1;
1439 break;
1440
1441 case OPTION_VERSION:
1442 print_version();
1443 exit(0);
1444 break;
1445
1446 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1447 case OPTION_TSTAMP_PRECISION:
1448 gndo->ndo_tstamp_precision = tstamp_precision_from_string(optarg);
1449 if (gndo->ndo_tstamp_precision < 0)
1450 error("unsupported time stamp precision");
1451 break;
1452 #endif
1453
1454 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1455 case OPTION_IMMEDIATE_MODE:
1456 gndo->ndo_immediate = 1;
1457 break;
1458 #endif
1459
1460 default:
1461 print_usage();
1462 exit(1);
1463 /* NOTREACHED */
1464 }
1465
1466 #ifdef HAVE_PCAP_FINDALLDEVS
1467 if (Dflag)
1468 show_devices_and_exit();
1469 #endif
1470
1471 switch (tflag) {
1472
1473 case 0: /* Default */
1474 case 4: /* Default + Date*/
1475 thiszone = gmt2local(0);
1476 break;
1477
1478 case 1: /* No time stamp */
1479 case 2: /* Unix timeval style */
1480 case 3: /* Microseconds since previous packet */
1481 case 5: /* Microseconds since first packet */
1482 break;
1483
1484 default: /* Not supported */
1485 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1486 break;
1487 }
1488
1489 if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1490 error("-f can not be used with -V or -r");
1491
1492 if (VFileName != NULL && RFileName != NULL)
1493 error("-V and -r are mutually exclusive.");
1494
1495 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1496 /*
1497 * If we're printing dissected packets to the standard output
1498 * rather than saving raw packets to a file, and the standard
1499 * output is a terminal, use immediate mode, as the user's
1500 * probably expecting to see packets pop up immediately.
1501 */
1502 if (WFileName == NULL && isatty(1))
1503 gndo->ndo_immediate = 1;
1504 #endif
1505
1506 #ifdef WITH_CHROOT
1507 /* if run as root, prepare for chrooting */
1508 if (getuid() == 0 || geteuid() == 0) {
1509 /* future extensibility for cmd-line arguments */
1510 if (!chroot_dir)
1511 chroot_dir = WITH_CHROOT;
1512 }
1513 #endif
1514
1515 #ifdef WITH_USER
1516 /* if run as root, prepare for dropping root privileges */
1517 if (getuid() == 0 || geteuid() == 0) {
1518 /* Run with '-Z root' to restore old behaviour */
1519 if (!username)
1520 username = WITH_USER;
1521 }
1522 #endif
1523
1524 if (RFileName != NULL || VFileName != NULL) {
1525 /*
1526 * If RFileName is non-null, it's the pathname of a
1527 * savefile to read. If VFileName is non-null, it's
1528 * the pathname of a file containing a list of pathnames
1529 * (one per line) of savefiles to read.
1530 *
1531 * In either case, we're reading a savefile, not doing
1532 * a live capture.
1533 */
1534 #ifndef WIN32
1535 /*
1536 * We don't need network access, so relinquish any set-UID
1537 * or set-GID privileges we have (if any).
1538 *
1539 * We do *not* want set-UID privileges when opening a
1540 * trace file, as that might let the user read other
1541 * people's trace files (especially if we're set-UID
1542 * root).
1543 */
1544 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1545 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1546 #endif /* WIN32 */
1547 if (VFileName != NULL) {
1548 if (VFileName[0] == '-' && VFileName[1] == '\0')
1549 VFile = stdin;
1550 else
1551 VFile = fopen(VFileName, "r");
1552
1553 if (VFile == NULL)
1554 error("Unable to open file: %s\n", strerror(errno));
1555
1556 ret = get_next_file(VFile, VFileLine);
1557 if (!ret)
1558 error("Nothing in %s\n", VFileName);
1559 RFileName = VFileLine;
1560 }
1561
1562 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1563 pd = pcap_open_offline_with_tstamp_precision(RFileName,
1564 gndo->ndo_tstamp_precision, ebuf);
1565 #else
1566 pd = pcap_open_offline(RFileName, ebuf);
1567 #endif
1568
1569 if (pd == NULL)
1570 error("%s", ebuf);
1571 #ifdef HAVE_CAPSICUM
1572 cap_rights_init(&rights, CAP_READ);
1573 if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 &&
1574 errno != ENOSYS) {
1575 error("unable to limit pcap descriptor");
1576 }
1577 #endif
1578 dlt = pcap_datalink(pd);
1579 dlt_name = pcap_datalink_val_to_name(dlt);
1580 if (dlt_name == NULL) {
1581 fprintf(stderr, "reading from file %s, link-type %u\n",
1582 RFileName, dlt);
1583 } else {
1584 fprintf(stderr,
1585 "reading from file %s, link-type %s (%s)\n",
1586 RFileName, dlt_name,
1587 pcap_datalink_val_to_description(dlt));
1588 }
1589 } else {
1590 /*
1591 * We're doing a live capture.
1592 */
1593 if (device == NULL) {
1594 device = pcap_lookupdev(ebuf);
1595 if (device == NULL)
1596 error("%s", ebuf);
1597 }
1598 #ifdef WIN32
1599 /*
1600 * Print a message to the standard error on Windows.
1601 * XXX - why do it here, with a different message?
1602 */
1603 if(strlen(device) == 1) /* we assume that an ASCII string is always longer than 1 char */
1604 { /* a Unicode string has a \0 as second byte (so strlen() is 1) */
1605 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1606 }
1607 else
1608 {
1609 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1610 }
1611
1612 fflush(stderr);
1613 #endif /* WIN32 */
1614 #ifdef HAVE_PCAP_CREATE
1615 pd = pcap_create(device, ebuf);
1616 if (pd == NULL)
1617 error("%s", ebuf);
1618 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1619 if (Jflag)
1620 show_tstamp_types_and_exit(device, pd);
1621 #endif
1622 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1623 status = pcap_set_tstamp_precision(pd, gndo->ndo_tstamp_precision);
1624 if (status != 0)
1625 error("%s: Can't set %ssecond time stamp precision: %s",
1626 device,
1627 tstamp_precision_to_string(gndo->ndo_tstamp_precision),
1628 pcap_statustostr(status));
1629 #endif
1630
1631 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1632 if (gndo->ndo_immediate) {
1633 status = pcap_set_immediate_mode(pd, 1);
1634 if (status != 0)
1635 error("%s: Can't set immediate mode: %s",
1636 device,
1637 pcap_statustostr(status));
1638 }
1639 #endif
1640 /*
1641 * Is this an interface that supports monitor mode?
1642 */
1643 if (pcap_can_set_rfmon(pd) == 1)
1644 supports_monitor_mode = 1;
1645 else
1646 supports_monitor_mode = 0;
1647 status = pcap_set_snaplen(pd, snaplen);
1648 if (status != 0)
1649 error("%s: Can't set snapshot length: %s",
1650 device, pcap_statustostr(status));
1651 status = pcap_set_promisc(pd, !pflag);
1652 if (status != 0)
1653 error("%s: Can't set promiscuous mode: %s",
1654 device, pcap_statustostr(status));
1655 if (Iflag) {
1656 status = pcap_set_rfmon(pd, 1);
1657 if (status != 0)
1658 error("%s: Can't set monitor mode: %s",
1659 device, pcap_statustostr(status));
1660 }
1661 status = pcap_set_timeout(pd, 1000);
1662 if (status != 0)
1663 error("%s: pcap_set_timeout failed: %s",
1664 device, pcap_statustostr(status));
1665 if (Bflag != 0) {
1666 status = pcap_set_buffer_size(pd, Bflag);
1667 if (status != 0)
1668 error("%s: Can't set buffer size: %s",
1669 device, pcap_statustostr(status));
1670 }
1671 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1672 if (jflag != -1) {
1673 status = pcap_set_tstamp_type(pd, jflag);
1674 if (status < 0)
1675 error("%s: Can't set time stamp type: %s",
1676 device, pcap_statustostr(status));
1677 }
1678 #endif
1679 status = pcap_activate(pd);
1680 if (status < 0) {
1681 /*
1682 * pcap_activate() failed.
1683 */
1684 cp = pcap_geterr(pd);
1685 if (status == PCAP_ERROR)
1686 error("%s", cp);
1687 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1688 status == PCAP_ERROR_PERM_DENIED) &&
1689 *cp != '\0')
1690 error("%s: %s\n(%s)", device,
1691 pcap_statustostr(status), cp);
1692 else
1693 error("%s: %s", device,
1694 pcap_statustostr(status));
1695 } else if (status > 0) {
1696 /*
1697 * pcap_activate() succeeded, but it's warning us
1698 * of a problem it had.
1699 */
1700 cp = pcap_geterr(pd);
1701 if (status == PCAP_WARNING)
1702 warning("%s", cp);
1703 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1704 *cp != '\0')
1705 warning("%s: %s\n(%s)", device,
1706 pcap_statustostr(status), cp);
1707 else
1708 warning("%s: %s", device,
1709 pcap_statustostr(status));
1710 }
1711 #ifdef HAVE_PCAP_SETDIRECTION
1712 if (Qflag != -1) {
1713 status = pcap_setdirection(pd, Qflag);
1714 if (status != 0)
1715 error("%s: pcap_setdirection() failed: %s",
1716 device, pcap_geterr(pd));
1717 }
1718 #endif /* HAVE_PCAP_SETDIRECTION */
1719 #else
1720 *ebuf = '\0';
1721 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1722 if (pd == NULL)
1723 error("%s", ebuf);
1724 else if (*ebuf)
1725 warning("%s", ebuf);
1726 #endif /* HAVE_PCAP_CREATE */
1727 /*
1728 * Let user own process after socket has been opened.
1729 */
1730 #ifndef WIN32
1731 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1732 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1733 #endif /* WIN32 */
1734 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1735 if(Bflag != 0)
1736 if(pcap_setbuff(pd, Bflag)==-1){
1737 error("%s", pcap_geterr(pd));
1738 }
1739 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1740 if (Lflag)
1741 show_dlts_and_exit(device, pd);
1742 if (gndo->ndo_dlt >= 0) {
1743 #ifdef HAVE_PCAP_SET_DATALINK
1744 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1745 error("%s", pcap_geterr(pd));
1746 #else
1747 /*
1748 * We don't actually support changing the
1749 * data link type, so we only let them
1750 * set it to what it already is.
1751 */
1752 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1753 error("%s is not one of the DLTs supported by this device\n",
1754 gndo->ndo_dltname);
1755 }
1756 #endif
1757 (void)fprintf(stderr, "%s: data link type %s\n",
1758 program_name, gndo->ndo_dltname);
1759 (void)fflush(stderr);
1760 }
1761 i = pcap_snapshot(pd);
1762 if (snaplen < i) {
1763 warning("snaplen raised from %d to %d", snaplen, i);
1764 snaplen = i;
1765 }
1766 if(fflag != 0) {
1767 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1768 warning("foreign (-f) flag used but: %s", ebuf);
1769 }
1770 }
1771
1772 }
1773 if (infile)
1774 cmdbuf = read_infile(infile);
1775 else
1776 cmdbuf = copy_argv(&argv[optind]);
1777
1778 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1779 error("%s", pcap_geterr(pd));
1780 if (dflag) {
1781 bpf_dump(&fcode, dflag);
1782 pcap_close(pd);
1783 free(cmdbuf);
1784 exit(0);
1785 }
1786 init_addrtoname(gndo, localnet, netmask);
1787 init_checksum();
1788
1789 #ifndef WIN32
1790 (void)setsignal(SIGPIPE, cleanup);
1791 (void)setsignal(SIGTERM, cleanup);
1792 (void)setsignal(SIGINT, cleanup);
1793 #endif /* WIN32 */
1794 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1795 (void)setsignal(SIGCHLD, child_cleanup);
1796 #endif
1797 /* Cooperate with nohup(1) */
1798 #ifndef WIN32
1799 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1800 (void)setsignal(SIGHUP, oldhandler);
1801 #endif /* WIN32 */
1802
1803 #ifndef WIN32
1804 /*
1805 * If a user name was specified with "-Z", attempt to switch to
1806 * that user's UID. This would probably be used with sudo,
1807 * to allow tcpdump to be run in a special restricted
1808 * account (if you just want to allow users to open capture
1809 * devices, and can't just give users that permission,
1810 * you'd make tcpdump set-UID or set-GID).
1811 *
1812 * Tcpdump doesn't necessarily write only to one savefile;
1813 * the general only way to allow a -Z instance to write to
1814 * savefiles as the user under whose UID it's run, rather
1815 * than as the user specified with -Z, would thus be to switch
1816 * to the original user ID before opening a capture file and
1817 * then switch back to the -Z user ID after opening the savefile.
1818 * Switching to the -Z user ID only after opening the first
1819 * savefile doesn't handle the general case.
1820 */
1821
1822 if (getuid() == 0 || geteuid() == 0) {
1823 #ifdef HAVE_LIBCAP_NG
1824 /* Initialize capng */
1825 capng_clear(CAPNG_SELECT_BOTH);
1826 if (username) {
1827 capng_updatev(
1828 CAPNG_ADD,
1829 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1830 CAP_SETUID,
1831 CAP_SETGID,
1832 -1);
1833 }
1834
1835 if (WFileName) {
1836 capng_update(
1837 CAPNG_ADD,
1838 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1839 CAP_DAC_OVERRIDE
1840 );
1841 }
1842 capng_apply(CAPNG_SELECT_BOTH);
1843 #endif /* HAVE_LIBCAP_NG */
1844 if (username || chroot_dir)
1845 droproot(username, chroot_dir);
1846
1847 }
1848 #endif /* WIN32 */
1849
1850 if (pcap_setfilter(pd, &fcode) < 0)
1851 error("%s", pcap_geterr(pd));
1852 #ifdef HAVE_CAPSICUM
1853 if (RFileName == NULL && VFileName == NULL) {
1854 static const unsigned long cmds[] = { BIOCGSTATS };
1855
1856 cap_rights_init(&rights, CAP_IOCTL, CAP_READ);
1857 if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 &&
1858 errno != ENOSYS) {
1859 error("unable to limit pcap descriptor");
1860 }
1861 if (cap_ioctls_limit(pcap_fileno(pd), cmds,
1862 sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) {
1863 error("unable to limit ioctls on pcap descriptor");
1864 }
1865 }
1866 #endif
1867 if (WFileName) {
1868 pcap_dumper_t *p;
1869 /* Do not exceed the default PATH_MAX for files. */
1870 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1871
1872 if (dumpinfo.CurrentFileName == NULL)
1873 error("malloc of dumpinfo.CurrentFileName");
1874
1875 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1876 if (Cflag != 0)
1877 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1878 else
1879 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1880
1881 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1882 #ifdef HAVE_LIBCAP_NG
1883 /* Give up CAP_DAC_OVERRIDE capability.
1884 * Only allow it to be restored if the -C or -G flag have been
1885 * set since we may need to create more files later on.
1886 */
1887 capng_update(
1888 CAPNG_DROP,
1889 (Cflag || Gflag ? 0 : CAPNG_PERMITTED)
1890 | CAPNG_EFFECTIVE,
1891 CAP_DAC_OVERRIDE
1892 );
1893 capng_apply(CAPNG_SELECT_BOTH);
1894 #endif /* HAVE_LIBCAP_NG */
1895 if (p == NULL)
1896 error("%s", pcap_geterr(pd));
1897 #ifdef HAVE_CAPSICUM
1898 set_dumper_capsicum_rights(p);
1899 #endif
1900 if (Cflag != 0 || Gflag != 0) {
1901 #ifdef HAVE_CAPSICUM
1902 dumpinfo.WFileName = strdup(basename(WFileName));
1903 dumpinfo.dirfd = open(dirname(WFileName),
1904 O_DIRECTORY | O_RDONLY);
1905 if (dumpinfo.dirfd < 0) {
1906 error("unable to open directory %s",
1907 dirname(WFileName));
1908 }
1909 cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL,
1910 CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE);
1911 if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 &&
1912 errno != ENOSYS) {
1913 error("unable to limit directory rights");
1914 }
1915 if (cap_fcntls_limit(dumpinfo.dirfd, CAP_FCNTL_GETFL) < 0 &&
1916 errno != ENOSYS) {
1917 error("unable to limit dump descriptor fcntls");
1918 }
1919 #else /* !HAVE_CAPSICUM */
1920 dumpinfo.WFileName = WFileName;
1921 #endif
1922 callback = dump_packet_and_trunc;
1923 dumpinfo.pd = pd;
1924 dumpinfo.p = p;
1925 pcap_userdata = (u_char *)&dumpinfo;
1926 } else {
1927 callback = dump_packet;
1928 pcap_userdata = (u_char *)p;
1929 }
1930 #ifdef HAVE_PCAP_DUMP_FLUSH
1931 if (Uflag)
1932 pcap_dump_flush(p);
1933 #endif
1934 } else {
1935 type = pcap_datalink(pd);
1936 printinfo = get_print_info(type);
1937 callback = print_packet;
1938 pcap_userdata = (u_char *)&printinfo;
1939 }
1940
1941 #ifdef SIGNAL_REQ_INFO
1942 /*
1943 * We can't get statistics when reading from a file rather
1944 * than capturing from a device.
1945 */
1946 if (RFileName == NULL)
1947 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1948 #endif
1949
1950 if (vflag > 0 && WFileName) {
1951 /*
1952 * When capturing to a file, "-v" means tcpdump should,
1953 * every 10 secodns, "v"erbosely report the number of
1954 * packets captured.
1955 */
1956 #ifdef USE_WIN32_MM_TIMER
1957 /* call verbose_stats_dump() each 1000 +/-100msec */
1958 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1959 setvbuf(stderr, NULL, _IONBF, 0);
1960 #elif defined(HAVE_ALARM)
1961 (void)setsignal(SIGALRM, verbose_stats_dump);
1962 alarm(1);
1963 #endif
1964 }
1965
1966 #ifndef WIN32
1967 if (RFileName == NULL) {
1968 /*
1969 * Live capture (if -V was specified, we set RFileName
1970 * to a file from the -V file). Print a message to
1971 * the standard error on UN*X.
1972 */
1973 if (!vflag && !WFileName) {
1974 (void)fprintf(stderr,
1975 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1976 program_name);
1977 } else
1978 (void)fprintf(stderr, "%s: ", program_name);
1979 dlt = pcap_datalink(pd);
1980 dlt_name = pcap_datalink_val_to_name(dlt);
1981 if (dlt_name == NULL) {
1982 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1983 device, dlt, snaplen);
1984 } else {
1985 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1986 device, dlt_name,
1987 pcap_datalink_val_to_description(dlt), snaplen);
1988 }
1989 (void)fflush(stderr);
1990 }
1991 #endif /* WIN32 */
1992
1993 #ifdef HAVE_CAPSICUM
1994 cansandbox = (nflag && VFileName == NULL && zflag == NULL);
1995 if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
1996 error("unable to enter the capability mode");
1997 if (cap_sandboxed())
1998 fprintf(stderr, "capability mode sandbox enabled\n");
1999 #endif /* HAVE_CAPSICUM */
2000
2001 do {
2002 status = pcap_loop(pd, cnt, callback, pcap_userdata);
2003 if (WFileName == NULL) {
2004 /*
2005 * We're printing packets. Flush the printed output,
2006 * so it doesn't get intermingled with error output.
2007 */
2008 if (status == -2) {
2009 /*
2010 * We got interrupted, so perhaps we didn't
2011 * manage to finish a line we were printing.
2012 * Print an extra newline, just in case.
2013 */
2014 putchar('\n');
2015 }
2016 (void)fflush(stdout);
2017 }
2018 if (status == -2) {
2019 /*
2020 * We got interrupted. If we are reading multiple
2021 * files (via -V) set these so that we stop.
2022 */
2023 VFileName = NULL;
2024 ret = NULL;
2025 }
2026 if (status == -1) {
2027 /*
2028 * Error. Report it.
2029 */
2030 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
2031 program_name, pcap_geterr(pd));
2032 }
2033 if (RFileName == NULL) {
2034 /*
2035 * We're doing a live capture. Report the capture
2036 * statistics.
2037 */
2038 info(1);
2039 }
2040 pcap_close(pd);
2041 if (VFileName != NULL) {
2042 ret = get_next_file(VFile, VFileLine);
2043 if (ret) {
2044 RFileName = VFileLine;
2045 pd = pcap_open_offline(RFileName, ebuf);
2046 if (pd == NULL)
2047 error("%s", ebuf);
2048 #ifdef HAVE_CAPSICUM
2049 cap_rights_init(&rights, CAP_READ);
2050 if (cap_rights_limit(fileno(pcap_file(pd)),
2051 &rights) < 0 && errno != ENOSYS) {
2052 error("unable to limit pcap descriptor");
2053 }
2054 #endif
2055 new_dlt = pcap_datalink(pd);
2056 if (WFileName && new_dlt != dlt)
2057 error("%s: new dlt does not match original", RFileName);
2058 printinfo = get_print_info(new_dlt);
2059 dlt_name = pcap_datalink_val_to_name(new_dlt);
2060 if (dlt_name == NULL) {
2061 fprintf(stderr, "reading from file %s, link-type %u\n",
2062 RFileName, new_dlt);
2063 } else {
2064 fprintf(stderr,
2065 "reading from file %s, link-type %s (%s)\n",
2066 RFileName, dlt_name,
2067 pcap_datalink_val_to_description(new_dlt));
2068 }
2069 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
2070 error("%s", pcap_geterr(pd));
2071 if (pcap_setfilter(pd, &fcode) < 0)
2072 error("%s", pcap_geterr(pd));
2073 }
2074 }
2075 }
2076 while (ret != NULL);
2077
2078 free(cmdbuf);
2079 exit(status == -1 ? 1 : 0);
2080 }
2081
2082 /* make a clean exit on interrupts */
2083 static RETSIGTYPE
2084 cleanup(int signo _U_)
2085 {
2086 #ifdef USE_WIN32_MM_TIMER
2087 if (timer_id)
2088 timeKillEvent(timer_id);
2089 timer_id = 0;
2090 #elif defined(HAVE_ALARM)
2091 alarm(0);
2092 #endif
2093
2094 #ifdef HAVE_PCAP_BREAKLOOP
2095 /*
2096 * We have "pcap_breakloop()"; use it, so that we do as little
2097 * as possible in the signal handler (it's probably not safe
2098 * to do anything with standard I/O streams in a signal handler -
2099 * the ANSI C standard doesn't say it is).
2100 */
2101 pcap_breakloop(pd);
2102 #else
2103 /*
2104 * We don't have "pcap_breakloop()"; this isn't safe, but
2105 * it's the best we can do. Print the summary if we're
2106 * not reading from a savefile - i.e., if we're doing a
2107 * live capture - and exit.
2108 */
2109 if (pd != NULL && pcap_file(pd) == NULL) {
2110 /*
2111 * We got interrupted, so perhaps we didn't
2112 * manage to finish a line we were printing.
2113 * Print an extra newline, just in case.
2114 */
2115 putchar('\n');
2116 (void)fflush(stdout);
2117 info(1);
2118 }
2119 exit(0);
2120 #endif
2121 }
2122
2123 /*
2124 On windows, we do not use a fork, so we do not care less about
2125 waiting a child processes to die
2126 */
2127 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2128 static RETSIGTYPE
2129 child_cleanup(int signo _U_)
2130 {
2131 wait(NULL);
2132 }
2133 #endif /* HAVE_FORK && HAVE_VFORK */
2134
2135 static void
2136 info(register int verbose)
2137 {
2138 struct pcap_stat stat;
2139
2140 /*
2141 * Older versions of libpcap didn't set ps_ifdrop on some
2142 * platforms; initialize it to 0 to handle that.
2143 */
2144 stat.ps_ifdrop = 0;
2145 if (pcap_stats(pd, &stat) < 0) {
2146 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
2147 infoprint = 0;
2148 return;
2149 }
2150
2151 if (!verbose)
2152 fprintf(stderr, "%s: ", program_name);
2153
2154 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
2155 PLURAL_SUFFIX(packets_captured));
2156 if (!verbose)
2157 fputs(", ", stderr);
2158 else
2159 putc('\n', stderr);
2160 (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
2161 PLURAL_SUFFIX(stat.ps_recv));
2162 if (!verbose)
2163 fputs(", ", stderr);
2164 else
2165 putc('\n', stderr);
2166 (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
2167 PLURAL_SUFFIX(stat.ps_drop));
2168 if (stat.ps_ifdrop != 0) {
2169 if (!verbose)
2170 fputs(", ", stderr);
2171 else
2172 putc('\n', stderr);
2173 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
2174 stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
2175 } else
2176 putc('\n', stderr);
2177 infoprint = 0;
2178 }
2179
2180 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2181 static void
2182 compress_savefile(const char *filename)
2183 {
2184 # ifdef HAVE_FORK
2185 if (fork())
2186 # else
2187 if (vfork())
2188 # endif
2189 return;
2190 /*
2191 * Set to lowest priority so that this doesn't disturb the capture
2192 */
2193 #ifdef NZERO
2194 setpriority(PRIO_PROCESS, 0, NZERO - 1);
2195 #else
2196 setpriority(PRIO_PROCESS, 0, 19);
2197 #endif
2198 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
2199 fprintf(stderr,
2200 "compress_savefile:execlp(%s, %s): %s\n",
2201 zflag,
2202 filename,
2203 strerror(errno));
2204 # ifdef HAVE_FORK
2205 exit(1);
2206 # else
2207 _exit(1);
2208 # endif
2209 }
2210 #else /* HAVE_FORK && HAVE_VFORK */
2211 static void
2212 compress_savefile(const char *filename)
2213 {
2214 fprintf(stderr,
2215 "compress_savefile failed. Functionality not implemented under your system\n");
2216 }
2217 #endif /* HAVE_FORK && HAVE_VFORK */
2218
2219 static void
2220 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2221 {
2222 struct dump_info *dump_info;
2223
2224 ++packets_captured;
2225
2226 ++infodelay;
2227
2228 dump_info = (struct dump_info *)user;
2229
2230 /*
2231 * XXX - this won't force the file to rotate on the specified time
2232 * boundary, but it will rotate on the first packet received after the
2233 * specified Gflag number of seconds. Note: if a Gflag time boundary
2234 * and a Cflag size boundary coincide, the time rotation will occur
2235 * first thereby cancelling the Cflag boundary (since the file should
2236 * be 0).
2237 */
2238 if (Gflag != 0) {
2239 /* Check if it is time to rotate */
2240 time_t t;
2241
2242 /* Get the current time */
2243 if ((t = time(NULL)) == (time_t)-1) {
2244 error("dump_and_trunc_packet: can't get current_time: %s",
2245 pcap_strerror(errno));
2246 }
2247
2248
2249 /* If the time is greater than the specified window, rotate */
2250 if (t - Gflag_time >= Gflag) {
2251 #ifdef HAVE_CAPSICUM
2252 FILE *fp;
2253 int fd;
2254 #endif
2255
2256 /* Update the Gflag_time */
2257 Gflag_time = t;
2258 /* Update Gflag_count */
2259 Gflag_count++;
2260 /*
2261 * Close the current file and open a new one.
2262 */
2263 pcap_dump_close(dump_info->p);
2264
2265 /*
2266 * Compress the file we just closed, if the user asked for it
2267 */
2268 if (zflag != NULL)
2269 compress_savefile(dump_info->CurrentFileName);
2270
2271 /*
2272 * Check to see if we've exceeded the Wflag (when
2273 * not using Cflag).
2274 */
2275 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
2276 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
2277 Wflag);
2278 exit(0);
2279 /* NOTREACHED */
2280 }
2281 if (dump_info->CurrentFileName != NULL)
2282 free(dump_info->CurrentFileName);
2283 /* Allocate space for max filename + \0. */
2284 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2285 if (dump_info->CurrentFileName == NULL)
2286 error("dump_packet_and_trunc: malloc");
2287 /*
2288 * Gflag was set otherwise we wouldn't be here. Reset the count
2289 * so multiple files would end with 1,2,3 in the filename.
2290 * The counting is handled with the -C flow after this.
2291 */
2292 Cflag_count = 0;
2293
2294 /*
2295 * This is always the first file in the Cflag
2296 * rotation: e.g. 0
2297 * We also don't need numbering if Cflag is not set.
2298 */
2299 if (Cflag != 0)
2300 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
2301 WflagChars);
2302 else
2303 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
2304
2305 #ifdef HAVE_LIBCAP_NG
2306 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2307 capng_apply(CAPNG_SELECT_BOTH);
2308 #endif /* HAVE_LIBCAP_NG */
2309 #ifdef HAVE_CAPSICUM
2310 fd = openat(dump_info->dirfd,
2311 dump_info->CurrentFileName,
2312 O_CREAT | O_WRONLY | O_TRUNC, 0644);
2313 if (fd < 0) {
2314 error("unable to open file %s",
2315 dump_info->CurrentFileName);
2316 }
2317 fp = fdopen(fd, "w");
2318 if (fp == NULL) {
2319 error("unable to fdopen file %s",
2320 dump_info->CurrentFileName);
2321 }
2322 dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2323 #else /* !HAVE_CAPSICUM */
2324 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2325 #endif
2326 #ifdef HAVE_LIBCAP_NG
2327 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2328 capng_apply(CAPNG_SELECT_BOTH);
2329 #endif /* HAVE_LIBCAP_NG */
2330 if (dump_info->p == NULL)
2331 error("%s", pcap_geterr(pd));
2332 #ifdef HAVE_CAPSICUM
2333 set_dumper_capsicum_rights(dump_info->p);
2334 #endif
2335 }
2336 }
2337
2338 /*
2339 * XXX - this won't prevent capture files from getting
2340 * larger than Cflag - the last packet written to the
2341 * file could put it over Cflag.
2342 */
2343 if (Cflag != 0) {
2344 long size = pcap_dump_ftell(dump_info->p);
2345
2346 if (size == -1)
2347 error("ftell fails on output file");
2348 if (size > Cflag) {
2349 #ifdef HAVE_CAPSICUM
2350 FILE *fp;
2351 int fd;
2352 #endif
2353
2354 /*
2355 * Close the current file and open a new one.
2356 */
2357 pcap_dump_close(dump_info->p);
2358
2359 /*
2360 * Compress the file we just closed, if the user
2361 * asked for it.
2362 */
2363 if (zflag != NULL)
2364 compress_savefile(dump_info->CurrentFileName);
2365
2366 Cflag_count++;
2367 if (Wflag > 0) {
2368 if (Cflag_count >= Wflag)
2369 Cflag_count = 0;
2370 }
2371 if (dump_info->CurrentFileName != NULL)
2372 free(dump_info->CurrentFileName);
2373 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2374 if (dump_info->CurrentFileName == NULL)
2375 error("dump_packet_and_trunc: malloc");
2376 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
2377 #ifdef HAVE_LIBCAP_NG
2378 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2379 capng_apply(CAPNG_SELECT_BOTH);
2380 #endif /* HAVE_LIBCAP_NG */
2381 #ifdef HAVE_CAPSICUM
2382 fd = openat(dump_info->dirfd, dump_info->CurrentFileName,
2383 O_CREAT | O_WRONLY | O_TRUNC, 0644);
2384 if (fd < 0) {
2385 error("unable to open file %s",
2386 dump_info->CurrentFileName);
2387 }
2388 fp = fdopen(fd, "w");
2389 if (fp == NULL) {
2390 error("unable to fdopen file %s",
2391 dump_info->CurrentFileName);
2392 }
2393 dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2394 #else /* !HAVE_CAPSICUM */
2395 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2396 #endif
2397 #ifdef HAVE_LIBCAP_NG
2398 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2399 capng_apply(CAPNG_SELECT_BOTH);
2400 #endif /* HAVE_LIBCAP_NG */
2401 if (dump_info->p == NULL)
2402 error("%s", pcap_geterr(pd));
2403 #ifdef HAVE_CAPSICUM
2404 set_dumper_capsicum_rights(dump_info->p);
2405 #endif
2406 }
2407 }
2408
2409 pcap_dump((u_char *)dump_info->p, h, sp);
2410 #ifdef HAVE_PCAP_DUMP_FLUSH
2411 if (Uflag)
2412 pcap_dump_flush(dump_info->p);
2413 #endif
2414
2415 --infodelay;
2416 if (infoprint)
2417 info(0);
2418 }
2419
2420 static void
2421 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2422 {
2423 ++packets_captured;
2424
2425 ++infodelay;
2426
2427 pcap_dump(user, h, sp);
2428 #ifdef HAVE_PCAP_DUMP_FLUSH
2429 if (Uflag)
2430 pcap_dump_flush((pcap_dumper_t *)user);
2431 #endif
2432
2433 --infodelay;
2434 if (infoprint)
2435 info(0);
2436 }
2437
2438 static void
2439 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2440 {
2441 struct print_info *print_info;
2442 u_int hdrlen;
2443 netdissect_options *ndo;
2444
2445 ++packets_captured;
2446
2447 ++infodelay;
2448
2449 print_info = (struct print_info *)user;
2450 ndo = print_info->ndo;
2451
2452 if(ndo->ndo_packet_number)
2453 ND_PRINT((ndo, "%5u ", packets_captured));
2454
2455 ts_print(ndo, &h->ts);
2456
2457 /*
2458 * Some printers want to check that they're not walking off the
2459 * end of the packet.
2460 * Rather than pass it all the way down, we set this member
2461 * of the netdissect_options structure.
2462 */
2463 ndo->ndo_snapend = sp + h->caplen;
2464
2465 if(print_info->ndo_type) {
2466 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
2467 } else {
2468 hdrlen = (*print_info->p.printer)(h, sp);
2469 }
2470
2471 /*
2472 * Restore the original snapend, as a printer might have
2473 * changed it.
2474 */
2475 ndo->ndo_snapend = sp + h->caplen;
2476 if (ndo->ndo_Xflag) {
2477 /*
2478 * Print the raw packet data in hex and ASCII.
2479 */
2480 if (ndo->ndo_Xflag > 1) {
2481 /*
2482 * Include the link-layer header.
2483 */
2484 hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
2485 } else {
2486 /*
2487 * Don't include the link-layer header - and if
2488 * we have nothing past the link-layer header,
2489 * print nothing.
2490 */
2491 if (h->caplen > hdrlen)
2492 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
2493 h->caplen - hdrlen);
2494 }
2495 } else if (ndo->ndo_xflag) {
2496 /*
2497 * Print the raw packet data in hex.
2498 */
2499 if (ndo->ndo_xflag > 1) {
2500 /*
2501 * Include the link-layer header.
2502 */
2503 hex_print(ndo, "\n\t", sp, h->caplen);
2504 } else {
2505 /*
2506 * Don't include the link-layer header - and if
2507 * we have nothing past the link-layer header,
2508 * print nothing.
2509 */
2510 if (h->caplen > hdrlen)
2511 hex_print(ndo, "\n\t", sp + hdrlen,
2512 h->caplen - hdrlen);
2513 }
2514 } else if (ndo->ndo_Aflag) {
2515 /*
2516 * Print the raw packet data in ASCII.
2517 */
2518 if (ndo->ndo_Aflag > 1) {
2519 /*
2520 * Include the link-layer header.
2521 */
2522 ascii_print(ndo, sp, h->caplen);
2523 } else {
2524 /*
2525 * Don't include the link-layer header - and if
2526 * we have nothing past the link-layer header,
2527 * print nothing.
2528 */
2529 if (h->caplen > hdrlen)
2530 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
2531 }
2532 }
2533
2534 putchar('\n');
2535
2536 --infodelay;
2537 if (infoprint)
2538 info(0);
2539 }
2540
2541 #ifdef WIN32
2542 /*
2543 * XXX - there should really be libpcap calls to get the version
2544 * number as a string (the string would be generated from #defines
2545 * at run time, so that it's not generated from string constants
2546 * in the library, as, on many UNIX systems, those constants would
2547 * be statically linked into the application executable image, and
2548 * would thus reflect the version of libpcap on the system on
2549 * which the application was *linked*, not the system on which it's
2550 * *running*.
2551 *
2552 * That routine should be documented, unlike the "version[]"
2553 * string, so that UNIX vendors providing their own libpcaps
2554 * don't omit it (as a couple of vendors have...).
2555 *
2556 * Packet.dll should perhaps also export a routine to return the
2557 * version number of the Packet.dll code, to supply the
2558 * "Wpcap_version" information on Windows.
2559 */
2560 char WDversion[]="current-git.tcpdump.org";
2561 #if !defined(HAVE_GENERATED_VERSION)
2562 char version[]="current-git.tcpdump.org";
2563 #endif
2564 char pcap_version[]="current-git.tcpdump.org";
2565 char Wpcap_version[]="3.1";
2566 #endif
2567
2568 /*
2569 * By default, print the specified data out in hex and ASCII.
2570 */
2571 static void
2572 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
2573 {
2574 hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
2575 }
2576
2577 void
2578 default_print(const u_char *bp, u_int length)
2579 {
2580 ndo_default_print(gndo, bp, length);
2581 }
2582
2583 #ifdef SIGNAL_REQ_INFO
2584 RETSIGTYPE requestinfo(int signo _U_)
2585 {
2586 if (infodelay)
2587 ++infoprint;
2588 else
2589 info(0);
2590 }
2591 #endif
2592
2593 /*
2594 * Called once each second in verbose mode while dumping to file
2595 */
2596 #ifdef USE_WIN32_MM_TIMER
2597 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2598 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2599 {
2600 struct pcap_stat stat;
2601
2602 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2603 fprintf(stderr, "Got %u\r", packets_captured);
2604 }
2605 #elif defined(HAVE_ALARM)
2606 static void verbose_stats_dump(int sig _U_)
2607 {
2608 struct pcap_stat stat;
2609
2610 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2611 fprintf(stderr, "Got %u\r", packets_captured);
2612 alarm(1);
2613 }
2614 #endif
2615
2616 USES_APPLE_DEPRECATED_API
2617 static void
2618 print_version(void)
2619 {
2620 extern char version[];
2621 #ifndef HAVE_PCAP_LIB_VERSION
2622 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2623 extern char pcap_version[];
2624 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2625 static char pcap_version[] = "unknown";
2626 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2627 #endif /* HAVE_PCAP_LIB_VERSION */
2628
2629 #ifdef HAVE_PCAP_LIB_VERSION
2630 #ifdef WIN32
2631 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2632 #else /* WIN32 */
2633 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2634 #endif /* WIN32 */
2635 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2636 #else /* HAVE_PCAP_LIB_VERSION */
2637 #ifdef WIN32
2638 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2639 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2640 #else /* WIN32 */
2641 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2642 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2643 #endif /* WIN32 */
2644 #endif /* HAVE_PCAP_LIB_VERSION */
2645
2646 #if defined(HAVE_LIBCRYPTO) && defined(SSLEAY_VERSION)
2647 (void)fprintf (stderr, "%s\n", SSLeay_version(SSLEAY_VERSION));
2648 #endif
2649
2650 #ifdef USE_LIBSMI
2651 (void)fprintf (stderr, "SMI-library: %s\n", smi_version_string);
2652 #endif
2653 }
2654 USES_APPLE_RST
2655
2656 static void
2657 print_usage(void)
2658 {
2659 print_version();
2660 (void)fprintf(stderr,
2661 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX#]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2662 (void)fprintf(stderr,
2663 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2664 (void)fprintf(stderr,
2665 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ] [ --number ]\n");
2666 #ifdef HAVE_PCAP_SETDIRECTION
2667 (void)fprintf(stderr,
2668 "\t\t[ -Q in|out|inout ]\n");
2669 #endif
2670 (void)fprintf(stderr,
2671 "\t\t[ -r file ] [ -s snaplen ] ");
2672 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
2673 (void)fprintf(stderr, "[ --time-stamp-precision precision ]\n");
2674 (void)fprintf(stderr,
2675 "\t\t");
2676 #endif
2677 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
2678 (void)fprintf(stderr, "[ --immediate-mode ] ");
2679 #endif
2680 (void)fprintf(stderr, "[ -T type ] [ --version ] [ -V file ]\n");
2681 (void)fprintf(stderr,
2682 "\t\t[ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2683 (void)fprintf(stderr,
2684 "\t\t[ -Z user ] [ expression ]\n");
2685 }
2686
2687
2688
2689 /* VARARGS */
2690 static void
2691 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2692 {
2693 va_list ap;
2694
2695 (void)fprintf(stderr, "%s: ", program_name);
2696 va_start(ap, fmt);
2697 (void)vfprintf(stderr, fmt, ap);
2698 va_end(ap);
2699 if (*fmt) {
2700 fmt += strlen(fmt);
2701 if (fmt[-1] != '\n')
2702 (void)fputc('\n', stderr);
2703 }
2704 exit(1);
2705 /* NOTREACHED */
2706 }
2707
2708 /* VARARGS */
2709 static void
2710 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2711 {
2712 va_list ap;
2713
2714 (void)fprintf(stderr, "%s: WARNING: ", program_name);
2715 va_start(ap, fmt);
2716 (void)vfprintf(stderr, fmt, ap);
2717 va_end(ap);
2718 if (*fmt) {
2719 fmt += strlen(fmt);
2720 if (fmt[-1] != '\n')
2721 (void)fputc('\n', stderr);
2722 }
2723 }
2724 /*
2725 * Local Variables:
2726 * c-style: whitesmith
2727 * c-basic-offset: 8
2728 * End:
2729 */
[mirror] the TCPdump network dissector