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 #ifdef HAVE_PCAP_SETDIRECTION
109 int Pflag = -1; /* Restrict captured packet by sent/receive direction */
110 #endif
111 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
112
113 static int infodelay;
114 static int infoprint;
115
116 char *program_name;
117
118 int32_t thiszone; /* seconds offset from gmt to local time */
119
120 /* Forwards */
121 static RETSIGTYPE cleanup(int);
122 static RETSIGTYPE child_cleanup(int);
123 static void usage(void) __attribute__((noreturn));
124 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
125
126 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
127 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
128 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
129 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
130 static void droproot(const char *, const char *);
131 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
132 __attribute__ ((noreturn, format (printf, 2, 3)));
133 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
134
135 #ifdef SIGNAL_REQ_INFO
136 RETSIGTYPE requestinfo(int);
137 #endif
138
139 #if defined(USE_WIN32_MM_TIMER)
140 #include <MMsystem.h>
141 static UINT timer_id;
142 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
143 #elif defined(HAVE_ALARM)
144 static void verbose_stats_dump(int sig);
145 #endif
146
147 static void info(int);
148 static u_int packets_captured;
149
150 struct printer {
151 if_printer f;
152 int type;
153 };
154
155
156 struct ndo_printer {
157 if_ndo_printer f;
158 int type;
159 };
160
161
162 static struct printer printers[] = {
163 { arcnet_if_print, DLT_ARCNET },
164 #ifdef DLT_ARCNET_LINUX
165 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
166 #endif
167 { token_if_print, DLT_IEEE802 },
168 #ifdef DLT_LANE8023
169 { lane_if_print, DLT_LANE8023 },
170 #endif
171 #ifdef DLT_CIP
172 { cip_if_print, DLT_CIP },
173 #endif
174 #ifdef DLT_ATM_CLIP
175 { cip_if_print, DLT_ATM_CLIP },
176 #endif
177 { sl_if_print, DLT_SLIP },
178 #ifdef DLT_SLIP_BSDOS
179 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
180 #endif
181 { ppp_if_print, DLT_PPP },
182 #ifdef DLT_PPP_WITHDIRECTION
183 { ppp_if_print, DLT_PPP_WITHDIRECTION },
184 #endif
185 #ifdef DLT_PPP_BSDOS
186 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
187 #endif
188 { fddi_if_print, DLT_FDDI },
189 { null_if_print, DLT_NULL },
190 #ifdef DLT_LOOP
191 { null_if_print, DLT_LOOP },
192 #endif
193 { raw_if_print, DLT_RAW },
194 { atm_if_print, DLT_ATM_RFC1483 },
195 #ifdef DLT_C_HDLC
196 { chdlc_if_print, DLT_C_HDLC },
197 #endif
198 #ifdef DLT_HDLC
199 { chdlc_if_print, DLT_HDLC },
200 #endif
201 #ifdef DLT_PPP_SERIAL
202 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
203 #endif
204 #ifdef DLT_PPP_ETHER
205 { pppoe_if_print, DLT_PPP_ETHER },
206 #endif
207 #ifdef DLT_LINUX_SLL
208 { sll_if_print, DLT_LINUX_SLL },
209 #endif
210 #ifdef DLT_IEEE802_11
211 { ieee802_11_if_print, DLT_IEEE802_11},
212 #endif
213 #ifdef DLT_LTALK
214 { ltalk_if_print, DLT_LTALK },
215 #endif
216 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
217 { pflog_if_print, DLT_PFLOG },
218 #endif
219 #ifdef DLT_FR
220 { fr_if_print, DLT_FR },
221 #endif
222 #ifdef DLT_FRELAY
223 { fr_if_print, DLT_FRELAY },
224 #endif
225 #ifdef DLT_SUNATM
226 { sunatm_if_print, DLT_SUNATM },
227 #endif
228 #ifdef DLT_IP_OVER_FC
229 { ipfc_if_print, DLT_IP_OVER_FC },
230 #endif
231 #ifdef DLT_PRISM_HEADER
232 { prism_if_print, DLT_PRISM_HEADER },
233 #endif
234 #ifdef DLT_IEEE802_11_RADIO
235 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
236 #endif
237 #ifdef DLT_ENC
238 { enc_if_print, DLT_ENC },
239 #endif
240 #ifdef DLT_SYMANTEC_FIREWALL
241 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
242 #endif
243 #ifdef DLT_APPLE_IP_OVER_IEEE1394
244 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
245 #endif
246 #ifdef DLT_IEEE802_11_RADIO_AVS
247 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
248 #endif
249 #ifdef DLT_JUNIPER_ATM1
250 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
251 #endif
252 #ifdef DLT_JUNIPER_ATM2
253 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
254 #endif
255 #ifdef DLT_JUNIPER_MFR
256 { juniper_mfr_print, DLT_JUNIPER_MFR },
257 #endif
258 #ifdef DLT_JUNIPER_MLFR
259 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
260 #endif
261 #ifdef DLT_JUNIPER_MLPPP
262 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
263 #endif
264 #ifdef DLT_JUNIPER_PPPOE
265 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
266 #endif
267 #ifdef DLT_JUNIPER_PPPOE_ATM
268 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
269 #endif
270 #ifdef DLT_JUNIPER_GGSN
271 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
272 #endif
273 #ifdef DLT_JUNIPER_ES
274 { juniper_es_print, DLT_JUNIPER_ES },
275 #endif
276 #ifdef DLT_JUNIPER_MONITOR
277 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
278 #endif
279 #ifdef DLT_JUNIPER_SERVICES
280 { juniper_services_print, DLT_JUNIPER_SERVICES },
281 #endif
282 #ifdef DLT_JUNIPER_ETHER
283 { juniper_ether_print, DLT_JUNIPER_ETHER },
284 #endif
285 #ifdef DLT_JUNIPER_PPP
286 { juniper_ppp_print, DLT_JUNIPER_PPP },
287 #endif
288 #ifdef DLT_JUNIPER_FRELAY
289 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
290 #endif
291 #ifdef DLT_JUNIPER_CHDLC
292 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
293 #endif
294 #ifdef DLT_MFR
295 { mfr_if_print, DLT_MFR },
296 #endif
297 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
298 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
299 #endif
300 #ifdef HAVE_PCAP_USB_H
301 #ifdef DLT_USB_LINUX
302 { usb_linux_48_byte_print, DLT_USB_LINUX},
303 #endif /* DLT_USB_LINUX */
304 #ifdef DLT_USB_LINUX_MMAPPED
305 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
306 #endif /* DLT_USB_LINUX_MMAPPED */
307 #endif /* HAVE_PCAP_USB_H */
308 #ifdef DLT_IPV4
309 { raw_if_print, DLT_IPV4 },
310 #endif
311 #ifdef DLT_IPV6
312 { raw_if_print, DLT_IPV6 },
313 #endif
314 { NULL, 0 },
315 };
316
317 static struct ndo_printer ndo_printers[] = {
318 { ether_if_print, DLT_EN10MB },
319 #ifdef DLT_IPNET
320 { ipnet_if_print, DLT_IPNET },
321 #endif
322 #ifdef DLT_IEEE802_15_4
323 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
324 #endif
325 #ifdef DLT_IEEE802_15_4_NOFCS
326 { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
327 #endif
328 #ifdef DLT_PPI
329 { ppi_if_print, DLT_PPI },
330 #endif
331 #ifdef DLT_NETANALYZER
332 { netanalyzer_if_print, DLT_NETANALYZER },
333 #endif
334 #ifdef DLT_NETANALYZER_TRANSPARENT
335 { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
336 #endif
337 #if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H)
338 { nflog_if_print, DLT_NFLOG},
339 #endif
340 { NULL, 0 },
341 };
342
343 if_printer
lookup_printer(int type)344 lookup_printer(int type)
345 {
346 struct printer *p;
347
348 for (p = printers; p->f; ++p)
349 if (type == p->type)
350 return p->f;
351
352 return NULL;
353 /* NOTREACHED */
354 }
355
356 if_ndo_printer
lookup_ndo_printer(int type)357 lookup_ndo_printer(int type)
358 {
359 struct ndo_printer *p;
360
361 for (p = ndo_printers; p->f; ++p)
362 if (type == p->type)
363 return p->f;
364
365 return NULL;
366 /* NOTREACHED */
367 }
368
369 static pcap_t *pd;
370
371 static int supports_monitor_mode;
372
373 extern int optind;
374 extern int opterr;
375 extern char *optarg;
376
377 struct print_info {
378 netdissect_options *ndo;
379 union {
380 if_printer printer;
381 if_ndo_printer ndo_printer;
382 } p;
383 int ndo_type;
384 };
385
386 struct dump_info {
387 char *WFileName;
388 char *CurrentFileName;
389 pcap_t *pd;
390 pcap_dumper_t *p;
391 };
392
393 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
394 static void
show_tstamp_types_and_exit(const char * device,pcap_t * pd)395 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
396 {
397 int n_tstamp_types;
398 int *tstamp_types = 0;
399 const char *tstamp_type_name;
400 int i;
401
402 n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
403 if (n_tstamp_types < 0)
404 error("%s", pcap_geterr(pd));
405
406 if (n_tstamp_types == 0) {
407 fprintf(stderr, "Time stamp type cannot be set for %s\n",
408 device);
409 exit(0);
410 }
411 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
412 device);
413 for (i = 0; i < n_tstamp_types; i++) {
414 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
415 if (tstamp_type_name != NULL) {
416 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
417 pcap_tstamp_type_val_to_description(tstamp_types[i]));
418 } else {
419 (void) fprintf(stderr, " %d\n", tstamp_types[i]);
420 }
421 }
422 pcap_free_tstamp_types(tstamp_types);
423 exit(0);
424 }
425 #endif
426
427 static void
show_dlts_and_exit(const char * device,pcap_t * pd)428 show_dlts_and_exit(const char *device, pcap_t *pd)
429 {
430 int n_dlts;
431 int *dlts = 0;
432 const char *dlt_name;
433
434 n_dlts = pcap_list_datalinks(pd, &dlts);
435 if (n_dlts < 0)
436 error("%s", pcap_geterr(pd));
437 else if (n_dlts == 0 || !dlts)
438 error("No data link types.");
439
440 /*
441 * If the interface is known to support monitor mode, indicate
442 * whether these are the data link types available when not in
443 * monitor mode, if -I wasn't specified, or when in monitor mode,
444 * when -I was specified (the link-layer types available in
445 * monitor mode might be different from the ones available when
446 * not in monitor mode).
447 */
448 if (supports_monitor_mode)
449 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
450 device,
451 Iflag ? "when in monitor mode" : "when not in monitor mode");
452 else
453 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
454 device);
455
456 while (--n_dlts >= 0) {
457 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
458 if (dlt_name != NULL) {
459 (void) fprintf(stderr, " %s (%s)", dlt_name,
460 pcap_datalink_val_to_description(dlts[n_dlts]));
461
462 /*
463 * OK, does tcpdump handle that type?
464 */
465 if (lookup_printer(dlts[n_dlts]) == NULL
466 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
467 (void) fprintf(stderr, " (printing not supported)");
468 fprintf(stderr, "\n");
469 } else {
470 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
471 dlts[n_dlts]);
472 }
473 }
474 #ifdef HAVE_PCAP_FREE_DATALINKS
475 pcap_free_datalinks(dlts);
476 #endif
477 exit(0);
478 }
479
480 /*
481 * Set up flags that might or might not be supported depending on the
482 * version of libpcap we're using.
483 */
484 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
485 #define B_FLAG "B:"
486 #define B_FLAG_USAGE " [ -B size ]"
487 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
488 #define B_FLAG
489 #define B_FLAG_USAGE
490 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
491
492 #ifdef HAVE_PCAP_CREATE
493 #define I_FLAG "I"
494 #else /* HAVE_PCAP_CREATE */
495 #define I_FLAG
496 #endif /* HAVE_PCAP_CREATE */
497
498 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
499 #define j_FLAG "j:"
500 #define j_FLAG_USAGE " [ -j tstamptype ]"
501 #define J_FLAG "J"
502 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
503 #define j_FLAG
504 #define j_FLAG_USAGE
505 #define J_FLAG
506 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
507
508 #ifdef HAVE_PCAP_FINDALLDEVS
509 #ifndef HAVE_PCAP_IF_T
510 #undef HAVE_PCAP_FINDALLDEVS
511 #endif
512 #endif
513
514 #ifdef HAVE_PCAP_FINDALLDEVS
515 #define D_FLAG "D"
516 #else
517 #define D_FLAG
518 #endif
519
520 #ifdef HAVE_PCAP_DUMP_FLUSH
521 #define U_FLAG "U"
522 #else
523 #define U_FLAG
524 #endif
525
526 #ifdef HAVE_PCAP_SETDIRECTION
527 #define P_FLAG "P:"
528 #define Q_FLAG "Q:"
529 #else
530 #define P_FLAG
531 #define Q_FLAG
532 #endif
533
534 #ifndef WIN32
535 /* Drop root privileges and chroot if necessary */
536 static void
droproot(const char * username,const char * chroot_dir)537 droproot(const char *username, const char *chroot_dir)
538 {
539 struct passwd *pw = NULL;
540
541 if (chroot_dir && !username) {
542 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
543 exit(1);
544 }
545
546 pw = getpwnam(username);
547 if (pw) {
548 if (chroot_dir) {
549 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
550 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
551 chroot_dir, pcap_strerror(errno));
552 exit(1);
553 }
554 }
555 #ifdef HAVE_CAP_NG_H
556 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
557 if (ret < 0) {
558 printf("error : ret %d\n", ret);
559 }
560 /* We don't need CAP_SETUID and CAP_SETGID */
561 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
562 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
563 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
564 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
565 capng_apply(CAPNG_SELECT_BOTH);
566
567 #else
568 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
569 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
570 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
571 username,
572 (unsigned long)pw->pw_uid,
573 (unsigned long)pw->pw_gid,
574 pcap_strerror(errno));
575 exit(1);
576 }
577 #endif /* HAVE_CAP_NG_H */
578 }
579 else {
580 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
581 username);
582 exit(1);
583 }
584 }
585 #endif /* WIN32 */
586
587 static int
getWflagChars(int x)588 getWflagChars(int x)
589 {
590 int c = 0;
591
592 x -= 1;
593 while (x > 0) {
594 c += 1;
595 x /= 10;
596 }
597
598 return c;
599 }
600
601
602 static void
MakeFilename(char * buffer,char * orig_name,int cnt,int max_chars)603 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
604 {
605 char *filename = malloc(PATH_MAX + 1);
606 if (filename == NULL)
607 error("Makefilename: malloc");
608
609 /* Process with strftime if Gflag is set. */
610 if (Gflag != 0) {
611 struct tm *local_tm;
612
613 /* Convert Gflag_time to a usable format */
614 if ((local_tm = localtime(&Gflag_time)) == NULL) {
615 error("MakeTimedFilename: localtime");
616 }
617
618 /* There's no good way to detect an error in strftime since a return
619 * value of 0 isn't necessarily failure.
620 */
621 strftime(filename, PATH_MAX, orig_name, local_tm);
622 } else {
623 strncpy(filename, orig_name, PATH_MAX);
624 }
625
626 if (cnt == 0 && max_chars == 0)
627 strncpy(buffer, filename, PATH_MAX + 1);
628 else
629 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
630 /* Report an error if the filename is too large */
631 error("too many output files or filename is too long (> %d)", PATH_MAX);
632 free(filename);
633 }
634
tcpdump_printf(netdissect_options * ndo _U_,const char * fmt,...)635 static int tcpdump_printf(netdissect_options *ndo _U_,
636 const char *fmt, ...)
637 {
638
639 va_list args;
640 int ret;
641
642 va_start(args, fmt);
643 ret=vfprintf(stdout, fmt, args);
644 va_end(args);
645
646 return ret;
647 }
648
649 static struct print_info
get_print_info(int type)650 get_print_info(int type)
651 {
652 struct print_info printinfo;
653
654 printinfo.ndo_type = 1;
655 printinfo.ndo = gndo;
656 printinfo.p.ndo_printer = lookup_ndo_printer(type);
657 if (printinfo.p.ndo_printer == NULL) {
658 printinfo.p.printer = lookup_printer(type);
659 printinfo.ndo_type = 0;
660 if (printinfo.p.printer == NULL) {
661 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
662 if (gndo->ndo_dltname != NULL)
663 error("packet printing is not supported for link type %s: use -w",
664 gndo->ndo_dltname);
665 else
666 error("packet printing is not supported for link type %d: use -w", type);
667 }
668 }
669 return (printinfo);
670 }
671
672 static char *
get_next_file(FILE * VFile,char * ptr)673 get_next_file(FILE *VFile, char *ptr)
674 {
675 char *ret;
676
677 ret = fgets(ptr, PATH_MAX, VFile);
678 if (!ret)
679 return NULL;
680
681 if (ptr[strlen(ptr) - 1] == '\n')
682 ptr[strlen(ptr) - 1] = '\0';
683
684 return ret;
685 }
686
687 int
main(int argc,char ** argv)688 main(int argc, char **argv)
689 {
690 register int cnt, op, i;
691 bpf_u_int32 localnet, netmask;
692 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
693 pcap_handler callback;
694 int type;
695 int dlt;
696 int new_dlt;
697 const char *dlt_name;
698 struct bpf_program fcode;
699 #ifndef WIN32
700 RETSIGTYPE (*oldhandler)(int);
701 #endif
702 struct print_info printinfo;
703 struct dump_info dumpinfo;
704 u_char *pcap_userdata;
705 char ebuf[PCAP_ERRBUF_SIZE];
706 char VFileLine[PATH_MAX + 1];
707 char *username = NULL;
708 char *chroot_dir = NULL;
709 char *ret = NULL;
710 char *end;
711 #ifdef HAVE_PCAP_FINDALLDEVS
712 pcap_if_t *devpointer;
713 int devnum;
714 #endif
715 int status;
716 FILE *VFile;
717 #ifdef WIN32
718 if(wsockinit() != 0) return 1;
719 #endif /* WIN32 */
720
721 jflag=-1; /* not set */
722 gndo->ndo_Oflag=1;
723 gndo->ndo_Rflag=1;
724 gndo->ndo_dlt=-1;
725 gndo->ndo_default_print=ndo_default_print;
726 gndo->ndo_printf=tcpdump_printf;
727 gndo->ndo_error=ndo_error;
728 gndo->ndo_warning=ndo_warning;
729 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
730
731 cnt = -1;
732 device = NULL;
733 infile = NULL;
734 RFileName = NULL;
735 VFileName = NULL;
736 VFile = NULL;
737 WFileName = NULL;
738 dlt = -1;
739 if ((cp = strrchr(argv[0], '/')) != NULL)
740 program_name = cp + 1;
741 else
742 program_name = argv[0];
743
744 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
745 error("%s", ebuf);
746
747 #ifdef LIBSMI
748 smiInit("tcpdump");
749 #endif
750
751 while (
752 (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOp" P_FLAG "q" Q_FLAG "r:Rs:StT:u" U_FLAG "vV:w:W:xXy:Yz:Z:")) != -1)
753 switch (op) {
754
755 case 'a':
756 /* compatibility for old -a */
757 break;
758
759 case 'A':
760 ++Aflag;
761 break;
762
763 case 'b':
764 ++bflag;
765 break;
766
767 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
768 case 'B':
769 Bflag = atoi(optarg)*1024;
770 if (Bflag <= 0)
771 error("invalid packet buffer size %s", optarg);
772 break;
773 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
774
775 case 'c':
776 cnt = atoi(optarg);
777 if (cnt <= 0)
778 error("invalid packet count %s", optarg);
779 break;
780
781 case 'C':
782 Cflag = atoi(optarg) * 1000000;
783 if (Cflag < 0)
784 error("invalid file size %s", optarg);
785 break;
786
787 case 'd':
788 ++dflag;
789 break;
790
791 #ifdef HAVE_PCAP_FINDALLDEVS
792 case 'D':
793 if (pcap_findalldevs(&devpointer, ebuf) < 0)
794 error("%s", ebuf);
795 else {
796 for (i = 0; devpointer != 0; i++) {
797 printf("%d.%s", i+1, devpointer->name);
798 if (devpointer->description != NULL)
799 printf(" (%s)", devpointer->description);
800 printf("\n");
801 devpointer = devpointer->next;
802 }
803 }
804 return 0;
805 #endif /* HAVE_PCAP_FINDALLDEVS */
806
807 case 'L':
808 Lflag++;
809 break;
810
811 case 'e':
812 ++eflag;
813 break;
814
815 case 'E':
816 #ifndef HAVE_LIBCRYPTO
817 warning("crypto code not compiled in");
818 #endif
819 gndo->ndo_espsecret = optarg;
820 break;
821
822 case 'f':
823 ++fflag;
824 break;
825
826 case 'F':
827 infile = optarg;
828 break;
829
830 case 'G':
831 Gflag = atoi(optarg);
832 if (Gflag < 0)
833 error("invalid number of seconds %s", optarg);
834
835 /* We will create one file initially. */
836 Gflag_count = 0;
837
838 /* Grab the current time for rotation use. */
839 if ((Gflag_time = time(NULL)) == (time_t)-1) {
840 error("main: can't get current time: %s",
841 pcap_strerror(errno));
842 }
843 break;
844
845 case 'h':
846 usage();
847 break;
848
849 case 'H':
850 ++Hflag;
851 break;
852
853 case 'i':
854 if (optarg[0] == '0' && optarg[1] == 0)
855 error("Invalid adapter index");
856
857 #ifdef HAVE_PCAP_FINDALLDEVS
858 /*
859 * If the argument is a number, treat it as
860 * an index into the list of adapters, as
861 * printed by "tcpdump -D".
862 *
863 * This should be OK on UNIX systems, as interfaces
864 * shouldn't have names that begin with digits.
865 * It can be useful on Windows, where more than
866 * one interface can have the same name.
867 */
868 devnum = strtol(optarg, &end, 10);
869 if (optarg != end && *end == '\0') {
870 if (devnum < 0)
871 error("Invalid adapter index");
872
873 if (pcap_findalldevs(&devpointer, ebuf) < 0)
874 error("%s", ebuf);
875 else {
876 /*
877 * Look for the devnum-th entry
878 * in the list of devices
879 * (1-based).
880 */
881 for (i = 0;
882 i < devnum-1 && devpointer != NULL;
883 i++, devpointer = devpointer->next)
884 ;
885 if (devpointer == NULL)
886 error("Invalid adapter index");
887 }
888 device = devpointer->name;
889 break;
890 }
891 #endif /* HAVE_PCAP_FINDALLDEVS */
892 device = optarg;
893 break;
894
895 #ifdef HAVE_PCAP_CREATE
896 case 'I':
897 ++Iflag;
898 break;
899 #endif /* HAVE_PCAP_CREATE */
900
901 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
902 case 'j':
903 jflag = pcap_tstamp_type_name_to_val(optarg);
904 if (jflag < 0)
905 error("invalid time stamp type %s", optarg);
906 break;
907
908 case 'J':
909 Jflag++;
910 break;
911 #endif
912
913 case 'l':
914 #ifdef WIN32
915 /*
916 * _IOLBF is the same as _IOFBF in Microsoft's C
917 * libraries; the only alternative they offer
918 * is _IONBF.
919 *
920 * XXX - this should really be checking for MSVC++,
921 * not WIN32, if, for example, MinGW has its own
922 * C library that is more UNIX-compatible.
923 */
924 setvbuf(stdout, NULL, _IONBF, 0);
925 #else /* WIN32 */
926 #ifdef HAVE_SETLINEBUF
927 setlinebuf(stdout);
928 #else
929 setvbuf(stdout, NULL, _IOLBF, 0);
930 #endif
931 #endif /* WIN32 */
932 break;
933
934 case 'K':
935 ++Kflag;
936 break;
937
938 case 'm':
939 #ifdef LIBSMI
940 if (smiLoadModule(optarg) == 0) {
941 error("could not load MIB module %s", optarg);
942 }
943 sflag = 1;
944 #else
945 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
946 program_name, optarg);
947 (void)fprintf(stderr, "(no libsmi support)\n");
948 #endif
949 break;
950
951 case 'M':
952 /* TCP-MD5 shared secret */
953 #ifndef HAVE_LIBCRYPTO
954 warning("crypto code not compiled in");
955 #endif
956 sigsecret = optarg;
957 break;
958
959 case 'n':
960 ++nflag;
961 break;
962
963 case 'N':
964 ++Nflag;
965 break;
966
967 case 'O':
968 Oflag = 0;
969 break;
970
971 case 'p':
972 ++pflag;
973 break;
974 #ifdef HAVE_PCAP_SETDIRECTION
975 case 'P':
976 warning("don't use -P, use -Q; -P will be used for pcap-ng output in the future");
977 /* FALLTHROUGH */
978
979 case 'Q':
980 if (strcasecmp(optarg, "in") == 0)
981 Pflag = PCAP_D_IN;
982 else if (strcasecmp(optarg, "out") == 0)
983 Pflag = PCAP_D_OUT;
984 else if (strcasecmp(optarg, "inout") == 0)
985 Pflag = PCAP_D_INOUT;
986 else
987 error("unknown capture direction `%s'", optarg);
988 break;
989 #endif /* HAVE_PCAP_SETDIRECTION */
990 case 'q':
991 ++qflag;
992 ++suppress_default_print;
993 break;
994
995 case 'r':
996 RFileName = optarg;
997 break;
998
999 case 'R':
1000 Rflag = 0;
1001 break;
1002
1003 case 's':
1004 snaplen = strtol(optarg, &end, 0);
1005 if (optarg == end || *end != '\0'
1006 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
1007 error("invalid snaplen %s", optarg);
1008 else if (snaplen == 0)
1009 snaplen = MAXIMUM_SNAPLEN;
1010 break;
1011
1012 case 'S':
1013 ++Sflag;
1014 break;
1015
1016 case 't':
1017 ++tflag;
1018 break;
1019
1020 case 'T':
1021 if (strcasecmp(optarg, "vat") == 0)
1022 packettype = PT_VAT;
1023 else if (strcasecmp(optarg, "wb") == 0)
1024 packettype = PT_WB;
1025 else if (strcasecmp(optarg, "rpc") == 0)
1026 packettype = PT_RPC;
1027 else if (strcasecmp(optarg, "rtp") == 0)
1028 packettype = PT_RTP;
1029 else if (strcasecmp(optarg, "rtcp") == 0)
1030 packettype = PT_RTCP;
1031 else if (strcasecmp(optarg, "snmp") == 0)
1032 packettype = PT_SNMP;
1033 else if (strcasecmp(optarg, "cnfp") == 0)
1034 packettype = PT_CNFP;
1035 else if (strcasecmp(optarg, "tftp") == 0)
1036 packettype = PT_TFTP;
1037 else if (strcasecmp(optarg, "aodv") == 0)
1038 packettype = PT_AODV;
1039 else if (strcasecmp(optarg, "carp") == 0)
1040 packettype = PT_CARP;
1041 else if (strcasecmp(optarg, "radius") == 0)
1042 packettype = PT_RADIUS;
1043 else if (strcasecmp(optarg, "zmtp1") == 0)
1044 packettype = PT_ZMTP1;
1045 else if (strcasecmp(optarg, "vxlan") == 0)
1046 packettype = PT_VXLAN;
1047 else if (strcasecmp(optarg, "pgm") == 0)
1048 packettype = PT_PGM;
1049 else if (strcasecmp(optarg, "pgm_zmtp1") == 0)
1050 packettype = PT_PGM_ZMTP1;
1051 else if (strcasecmp(optarg, "lmp") == 0)
1052 packettype = PT_LMP;
1053 else
1054 error("unknown packet type `%s'", optarg);
1055 break;
1056
1057 case 'u':
1058 ++uflag;
1059 break;
1060
1061 #ifdef HAVE_PCAP_DUMP_FLUSH
1062 case 'U':
1063 ++Uflag;
1064 break;
1065 #endif
1066
1067 case 'v':
1068 ++vflag;
1069 break;
1070
1071 case 'V':
1072 VFileName = optarg;
1073 break;
1074
1075 case 'w':
1076 WFileName = optarg;
1077 break;
1078
1079 case 'W':
1080 Wflag = atoi(optarg);
1081 if (Wflag < 0)
1082 error("invalid number of output files %s", optarg);
1083 WflagChars = getWflagChars(Wflag);
1084 break;
1085
1086 case 'x':
1087 ++xflag;
1088 ++suppress_default_print;
1089 break;
1090
1091 case 'X':
1092 ++Xflag;
1093 ++suppress_default_print;
1094 break;
1095
1096 case 'y':
1097 gndo->ndo_dltname = optarg;
1098 gndo->ndo_dlt =
1099 pcap_datalink_name_to_val(gndo->ndo_dltname);
1100 if (gndo->ndo_dlt < 0)
1101 error("invalid data link type %s", gndo->ndo_dltname);
1102 break;
1103
1104 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1105 case 'Y':
1106 {
1107 /* Undocumented flag */
1108 #ifdef HAVE_PCAP_DEBUG
1109 extern int pcap_debug;
1110 pcap_debug = 1;
1111 #else
1112 extern int yydebug;
1113 yydebug = 1;
1114 #endif
1115 }
1116 break;
1117 #endif
1118 case 'z':
1119 if (optarg) {
1120 zflag = strdup(optarg);
1121 } else {
1122 usage();
1123 /* NOTREACHED */
1124 }
1125 break;
1126
1127 case 'Z':
1128 if (optarg) {
1129 username = strdup(optarg);
1130 }
1131 else {
1132 usage();
1133 /* NOTREACHED */
1134 }
1135 break;
1136
1137 default:
1138 usage();
1139 /* NOTREACHED */
1140 }
1141
1142 switch (tflag) {
1143
1144 case 0: /* Default */
1145 case 4: /* Default + Date*/
1146 thiszone = gmt2local(0);
1147 break;
1148
1149 case 1: /* No time stamp */
1150 case 2: /* Unix timeval style */
1151 case 3: /* Microseconds since previous packet */
1152 case 5: /* Microseconds since first packet */
1153 break;
1154
1155 default: /* Not supported */
1156 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1157 break;
1158 }
1159
1160 if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1161 error("-f can not be used with -V or -r");
1162
1163 if (VFileName != NULL && RFileName != NULL)
1164 error("-V and -r are mutually exclusive.");
1165
1166 #ifdef WITH_CHROOT
1167 /* if run as root, prepare for chrooting */
1168 if (getuid() == 0 || geteuid() == 0) {
1169 /* future extensibility for cmd-line arguments */
1170 if (!chroot_dir)
1171 chroot_dir = WITH_CHROOT;
1172 }
1173 #endif
1174
1175 #ifdef WITH_USER
1176 /* if run as root, prepare for dropping root privileges */
1177 if (getuid() == 0 || geteuid() == 0) {
1178 /* Run with '-Z root' to restore old behaviour */
1179 if (!username)
1180 username = WITH_USER;
1181 }
1182 #endif
1183
1184 if (RFileName != NULL || VFileName != NULL) {
1185 /*
1186 * If RFileName is non-null, it's the pathname of a
1187 * savefile to read. If VFileName is non-null, it's
1188 * the pathname of a file containing a list of pathnames
1189 * (one per line) of savefiles to read.
1190 *
1191 * In either case, we're reading a savefile, not doing
1192 * a live capture.
1193 */
1194 #ifndef WIN32
1195 /*
1196 * We don't need network access, so relinquish any set-UID
1197 * or set-GID privileges we have (if any).
1198 *
1199 * We do *not* want set-UID privileges when opening a
1200 * trace file, as that might let the user read other
1201 * people's trace files (especially if we're set-UID
1202 * root).
1203 */
1204 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1205 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1206 #endif /* WIN32 */
1207 if (VFileName != NULL) {
1208 if (VFileName[0] == '-' && VFileName[1] == '\0')
1209 VFile = stdin;
1210 else
1211 VFile = fopen(VFileName, "r");
1212
1213 if (VFile == NULL)
1214 error("Unable to open file: %s\n", strerror(errno));
1215
1216 ret = get_next_file(VFile, VFileLine);
1217 if (!ret)
1218 error("Nothing in %s\n", VFileName);
1219 RFileName = VFileLine;
1220 }
1221
1222 pd = pcap_open_offline(RFileName, ebuf);
1223 if (pd == NULL)
1224 error("%s", ebuf);
1225 dlt = pcap_datalink(pd);
1226 dlt_name = pcap_datalink_val_to_name(dlt);
1227 if (dlt_name == NULL) {
1228 fprintf(stderr, "reading from file %s, link-type %u\n",
1229 RFileName, dlt);
1230 } else {
1231 fprintf(stderr,
1232 "reading from file %s, link-type %s (%s)\n",
1233 RFileName, dlt_name,
1234 pcap_datalink_val_to_description(dlt));
1235 }
1236 localnet = 0;
1237 netmask = 0;
1238 } else {
1239 /*
1240 * We're doing a live capture.
1241 */
1242 if (device == NULL) {
1243 device = pcap_lookupdev(ebuf);
1244 if (device == NULL)
1245 error("%s", ebuf);
1246 }
1247 #ifdef WIN32
1248 /*
1249 * Print a message to the standard error on Windows.
1250 * XXX - why do it here, with a different message?
1251 */
1252 if(strlen(device) == 1) /* we assume that an ASCII string is always longer than 1 char */
1253 { /* a Unicode string has a \0 as second byte (so strlen() is 1) */
1254 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1255 }
1256 else
1257 {
1258 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1259 }
1260
1261 fflush(stderr);
1262 #endif /* WIN32 */
1263 #ifdef HAVE_PCAP_CREATE
1264 pd = pcap_create(device, ebuf);
1265 if (pd == NULL)
1266 error("%s", ebuf);
1267 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1268 if (Jflag)
1269 show_tstamp_types_and_exit(device, pd);
1270 #endif
1271 /*
1272 * Is this an interface that supports monitor mode?
1273 */
1274 if (pcap_can_set_rfmon(pd) == 1)
1275 supports_monitor_mode = 1;
1276 else
1277 supports_monitor_mode = 0;
1278 status = pcap_set_snaplen(pd, snaplen);
1279 if (status != 0)
1280 error("%s: Can't set snapshot length: %s",
1281 device, pcap_statustostr(status));
1282 status = pcap_set_promisc(pd, !pflag);
1283 if (status != 0)
1284 error("%s: Can't set promiscuous mode: %s",
1285 device, pcap_statustostr(status));
1286 if (Iflag) {
1287 status = pcap_set_rfmon(pd, 1);
1288 if (status != 0)
1289 error("%s: Can't set monitor mode: %s",
1290 device, pcap_statustostr(status));
1291 }
1292 status = pcap_set_timeout(pd, 1000);
1293 if (status != 0)
1294 error("%s: pcap_set_timeout failed: %s",
1295 device, pcap_statustostr(status));
1296 if (Bflag != 0) {
1297 status = pcap_set_buffer_size(pd, Bflag);
1298 if (status != 0)
1299 error("%s: Can't set buffer size: %s",
1300 device, pcap_statustostr(status));
1301 }
1302 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1303 if (jflag != -1) {
1304 status = pcap_set_tstamp_type(pd, jflag);
1305 if (status < 0)
1306 error("%s: Can't set time stamp type: %s",
1307 device, pcap_statustostr(status));
1308 }
1309 #endif
1310 status = pcap_activate(pd);
1311 if (status < 0) {
1312 /*
1313 * pcap_activate() failed.
1314 */
1315 cp = pcap_geterr(pd);
1316 if (status == PCAP_ERROR)
1317 error("%s", cp);
1318 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1319 status == PCAP_ERROR_PERM_DENIED) &&
1320 *cp != '\0')
1321 error("%s: %s\n(%s)", device,
1322 pcap_statustostr(status), cp);
1323 else
1324 error("%s: %s", device,
1325 pcap_statustostr(status));
1326 } else if (status > 0) {
1327 /*
1328 * pcap_activate() succeeded, but it's warning us
1329 * of a problem it had.
1330 */
1331 cp = pcap_geterr(pd);
1332 if (status == PCAP_WARNING)
1333 warning("%s", cp);
1334 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1335 *cp != '\0')
1336 warning("%s: %s\n(%s)", device,
1337 pcap_statustostr(status), cp);
1338 else
1339 warning("%s: %s", device,
1340 pcap_statustostr(status));
1341 }
1342 #ifdef HAVE_PCAP_SETDIRECTION
1343 if (Pflag != -1) {
1344 status = pcap_setdirection(pd, Pflag);
1345 if (status != 0)
1346 error("%s: pcap_setdirection() failed: %s",
1347 device, pcap_geterr(pd));
1348 }
1349 #endif
1350 #else
1351 *ebuf = '\0';
1352 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1353 if (pd == NULL)
1354 error("%s", ebuf);
1355 else if (*ebuf)
1356 warning("%s", ebuf);
1357 #endif /* HAVE_PCAP_CREATE */
1358 /*
1359 * Let user own process after socket has been opened.
1360 */
1361 #ifndef WIN32
1362 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1363 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1364 #endif /* WIN32 */
1365 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1366 if(Bflag != 0)
1367 if(pcap_setbuff(pd, Bflag)==-1){
1368 error("%s", pcap_geterr(pd));
1369 }
1370 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1371 if (Lflag)
1372 show_dlts_and_exit(device, pd);
1373 if (gndo->ndo_dlt >= 0) {
1374 #ifdef HAVE_PCAP_SET_DATALINK
1375 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1376 error("%s", pcap_geterr(pd));
1377 #else
1378 /*
1379 * We don't actually support changing the
1380 * data link type, so we only let them
1381 * set it to what it already is.
1382 */
1383 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1384 error("%s is not one of the DLTs supported by this device\n",
1385 gndo->ndo_dltname);
1386 }
1387 #endif
1388 (void)fprintf(stderr, "%s: data link type %s\n",
1389 program_name, gndo->ndo_dltname);
1390 (void)fflush(stderr);
1391 }
1392 i = pcap_snapshot(pd);
1393 if (snaplen < i) {
1394 warning("snaplen raised from %d to %d", snaplen, i);
1395 snaplen = i;
1396 }
1397 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1398 localnet = 0;
1399 netmask = 0;
1400 warning("%s", ebuf);
1401 }
1402 }
1403 if (infile)
1404 cmdbuf = read_infile(infile);
1405 else
1406 cmdbuf = copy_argv(&argv[optind]);
1407
1408 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1409 error("%s", pcap_geterr(pd));
1410 if (dflag) {
1411 bpf_dump(&fcode, dflag);
1412 pcap_close(pd);
1413 free(cmdbuf);
1414 exit(0);
1415 }
1416 init_addrtoname(localnet, netmask);
1417 init_checksum();
1418
1419 #ifndef WIN32
1420 (void)setsignal(SIGPIPE, cleanup);
1421 (void)setsignal(SIGTERM, cleanup);
1422 (void)setsignal(SIGINT, cleanup);
1423 #endif /* WIN32 */
1424 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1425 (void)setsignal(SIGCHLD, child_cleanup);
1426 #endif
1427 /* Cooperate with nohup(1) */
1428 #ifndef WIN32
1429 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1430 (void)setsignal(SIGHUP, oldhandler);
1431 #endif /* WIN32 */
1432
1433 #ifndef WIN32
1434 /*
1435 * If a user name was specified with "-Z", attempt to switch to
1436 * that user's UID. This would probably be used with sudo,
1437 * to allow tcpdump to be run in a special restricted
1438 * account (if you just want to allow users to open capture
1439 * devices, and can't just give users that permission,
1440 * you'd make tcpdump set-UID or set-GID).
1441 *
1442 * Tcpdump doesn't necessarily write only to one savefile;
1443 * the general only way to allow a -Z instance to write to
1444 * savefiles as the user under whose UID it's run, rather
1445 * than as the user specified with -Z, would thus be to switch
1446 * to the original user ID before opening a capture file and
1447 * then switch back to the -Z user ID after opening the savefile.
1448 * Switching to the -Z user ID only after opening the first
1449 * savefile doesn't handle the general case.
1450 */
1451
1452 #ifdef HAVE_CAP_NG_H
1453 /* We are running as root and we will be writing to savefile */
1454 if ((getuid() == 0 || geteuid() == 0) && WFileName) {
1455 if (username) {
1456 /* Drop all capabilities from effective set */
1457 capng_clear(CAPNG_EFFECTIVE);
1458 /* Add capabilities we will need*/
1459 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
1460 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
1461 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
1462
1463 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
1464 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
1465 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1466
1467 capng_apply(CAPNG_SELECT_BOTH);
1468 }
1469 }
1470 #endif /* HAVE_CAP_NG_H */
1471
1472 if (getuid() == 0 || geteuid() == 0) {
1473 if (username || chroot_dir)
1474 droproot(username, chroot_dir);
1475
1476 }
1477 #endif /* WIN32 */
1478
1479 if (pcap_setfilter(pd, &fcode) < 0)
1480 error("%s", pcap_geterr(pd));
1481 if (WFileName) {
1482 pcap_dumper_t *p;
1483 /* Do not exceed the default PATH_MAX for files. */
1484 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1485
1486 if (dumpinfo.CurrentFileName == NULL)
1487 error("malloc of dumpinfo.CurrentFileName");
1488
1489 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1490 if (Cflag != 0)
1491 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1492 else
1493 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1494
1495 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1496 #ifdef HAVE_CAP_NG_H
1497 /* Give up capabilities, clear Effective set */
1498 capng_clear(CAPNG_EFFECTIVE);
1499 #endif
1500 if (p == NULL)
1501 error("%s", pcap_geterr(pd));
1502 if (Cflag != 0 || Gflag != 0) {
1503 callback = dump_packet_and_trunc;
1504 dumpinfo.WFileName = WFileName;
1505 dumpinfo.pd = pd;
1506 dumpinfo.p = p;
1507 pcap_userdata = (u_char *)&dumpinfo;
1508 } else {
1509 callback = dump_packet;
1510 pcap_userdata = (u_char *)p;
1511 }
1512 #ifdef HAVE_PCAP_DUMP_FLUSH
1513 if (Uflag)
1514 pcap_dump_flush(p);
1515 #endif
1516 } else {
1517 type = pcap_datalink(pd);
1518 printinfo = get_print_info(type);
1519 callback = print_packet;
1520 pcap_userdata = (u_char *)&printinfo;
1521 }
1522
1523 #ifdef SIGNAL_REQ_INFO
1524 /*
1525 * We can't get statistics when reading from a file rather
1526 * than capturing from a device.
1527 */
1528 if (RFileName == NULL)
1529 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1530 #endif
1531
1532 if (vflag > 0 && WFileName) {
1533 /*
1534 * When capturing to a file, "-v" means tcpdump should,
1535 * every 10 secodns, "v"erbosely report the number of
1536 * packets captured.
1537 */
1538 #ifdef USE_WIN32_MM_TIMER
1539 /* call verbose_stats_dump() each 1000 +/-100msec */
1540 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1541 setvbuf(stderr, NULL, _IONBF, 0);
1542 #elif defined(HAVE_ALARM)
1543 (void)setsignal(SIGALRM, verbose_stats_dump);
1544 alarm(1);
1545 #endif
1546 }
1547
1548 #ifndef WIN32
1549 if (RFileName == NULL) {
1550 /*
1551 * Live capture (if -V was specified, we set RFileName
1552 * to a file from the -V file). Print a message to
1553 * the standard error on UN*X.
1554 */
1555 if (!vflag && !WFileName) {
1556 (void)fprintf(stderr,
1557 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1558 program_name);
1559 } else
1560 (void)fprintf(stderr, "%s: ", program_name);
1561 dlt = pcap_datalink(pd);
1562 dlt_name = pcap_datalink_val_to_name(dlt);
1563 if (dlt_name == NULL) {
1564 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1565 device, dlt, snaplen);
1566 } else {
1567 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1568 device, dlt_name,
1569 pcap_datalink_val_to_description(dlt), snaplen);
1570 }
1571 (void)fflush(stderr);
1572 }
1573 #endif /* WIN32 */
1574 do {
1575 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1576 if (WFileName == NULL) {
1577 /*
1578 * We're printing packets. Flush the printed output,
1579 * so it doesn't get intermingled with error output.
1580 */
1581 if (status == -2) {
1582 /*
1583 * We got interrupted, so perhaps we didn't
1584 * manage to finish a line we were printing.
1585 * Print an extra newline, just in case.
1586 */
1587 putchar('\n');
1588 }
1589 (void)fflush(stdout);
1590 }
1591 if (status == -2) {
1592 /*
1593 * We got interrupted. If we are reading multiple
1594 * files (via -V) set these so that we stop.
1595 */
1596 VFileName = NULL;
1597 ret = NULL;
1598 }
1599 if (status == -1) {
1600 /*
1601 * Error. Report it.
1602 */
1603 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1604 program_name, pcap_geterr(pd));
1605 }
1606 if (RFileName == NULL) {
1607 /*
1608 * We're doing a live capture. Report the capture
1609 * statistics.
1610 */
1611 info(1);
1612 }
1613 pcap_close(pd);
1614 if (VFileName != NULL) {
1615 ret = get_next_file(VFile, VFileLine);
1616 if (ret) {
1617 RFileName = VFileLine;
1618 pd = pcap_open_offline(RFileName, ebuf);
1619 if (pd == NULL)
1620 error("%s", ebuf);
1621 new_dlt = pcap_datalink(pd);
1622 if (WFileName && new_dlt != dlt)
1623 error("%s: new dlt does not match original", RFileName);
1624 printinfo = get_print_info(new_dlt);
1625 dlt_name = pcap_datalink_val_to_name(new_dlt);
1626 if (dlt_name == NULL) {
1627 fprintf(stderr, "reading from file %s, link-type %u\n",
1628 RFileName, new_dlt);
1629 } else {
1630 fprintf(stderr,
1631 "reading from file %s, link-type %s (%s)\n",
1632 RFileName, dlt_name,
1633 pcap_datalink_val_to_description(new_dlt));
1634 }
1635 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1636 error("%s", pcap_geterr(pd));
1637 if (pcap_setfilter(pd, &fcode) < 0)
1638 error("%s", pcap_geterr(pd));
1639 }
1640 }
1641 }
1642 while (ret != NULL);
1643
1644 free(cmdbuf);
1645 exit(status == -1 ? 1 : 0);
1646 }
1647
1648 /* make a clean exit on interrupts */
1649 static RETSIGTYPE
cleanup(int signo _U_)1650 cleanup(int signo _U_)
1651 {
1652 #ifdef USE_WIN32_MM_TIMER
1653 if (timer_id)
1654 timeKillEvent(timer_id);
1655 timer_id = 0;
1656 #elif defined(HAVE_ALARM)
1657 alarm(0);
1658 #endif
1659
1660 #ifdef HAVE_PCAP_BREAKLOOP
1661 /*
1662 * We have "pcap_breakloop()"; use it, so that we do as little
1663 * as possible in the signal handler (it's probably not safe
1664 * to do anything with standard I/O streams in a signal handler -
1665 * the ANSI C standard doesn't say it is).
1666 */
1667 pcap_breakloop(pd);
1668 #else
1669 /*
1670 * We don't have "pcap_breakloop()"; this isn't safe, but
1671 * it's the best we can do. Print the summary if we're
1672 * not reading from a savefile - i.e., if we're doing a
1673 * live capture - and exit.
1674 */
1675 if (pd != NULL && pcap_file(pd) == NULL) {
1676 /*
1677 * We got interrupted, so perhaps we didn't
1678 * manage to finish a line we were printing.
1679 * Print an extra newline, just in case.
1680 */
1681 putchar('\n');
1682 (void)fflush(stdout);
1683 info(1);
1684 }
1685 exit(0);
1686 #endif
1687 }
1688
1689 /*
1690 On windows, we do not use a fork, so we do not care less about
1691 waiting a child processes to die
1692 */
1693 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1694 static RETSIGTYPE
child_cleanup(int signo _U_)1695 child_cleanup(int signo _U_)
1696 {
1697 wait(NULL);
1698 }
1699 #endif /* HAVE_FORK && HAVE_VFORK */
1700
1701 static void
info(register int verbose)1702 info(register int verbose)
1703 {
1704 struct pcap_stat stat;
1705
1706 /*
1707 * Older versions of libpcap didn't set ps_ifdrop on some
1708 * platforms; initialize it to 0 to handle that.
1709 */
1710 stat.ps_ifdrop = 0;
1711 if (pcap_stats(pd, &stat) < 0) {
1712 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1713 infoprint = 0;
1714 return;
1715 }
1716
1717 if (!verbose)
1718 fprintf(stderr, "%s: ", program_name);
1719
1720 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1721 PLURAL_SUFFIX(packets_captured));
1722 if (!verbose)
1723 fputs(", ", stderr);
1724 else
1725 putc('\n', stderr);
1726 (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1727 PLURAL_SUFFIX(stat.ps_recv));
1728 if (!verbose)
1729 fputs(", ", stderr);
1730 else
1731 putc('\n', stderr);
1732 (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1733 PLURAL_SUFFIX(stat.ps_drop));
1734 if (stat.ps_ifdrop != 0) {
1735 if (!verbose)
1736 fputs(", ", stderr);
1737 else
1738 putc('\n', stderr);
1739 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1740 stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1741 } else
1742 putc('\n', stderr);
1743 infoprint = 0;
1744 }
1745
1746 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1747 static void
compress_savefile(const char * filename)1748 compress_savefile(const char *filename)
1749 {
1750 # ifdef HAVE_FORK
1751 if (fork())
1752 # else
1753 if (vfork())
1754 # endif
1755 return;
1756 /*
1757 * Set to lowest priority so that this doesn't disturb the capture
1758 */
1759 #ifdef NZERO
1760 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1761 #else
1762 setpriority(PRIO_PROCESS, 0, 19);
1763 #endif
1764 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1765 fprintf(stderr,
1766 "compress_savefile:execlp(%s, %s): %s\n",
1767 zflag,
1768 filename,
1769 strerror(errno));
1770 # ifdef HAVE_FORK
1771 exit(1);
1772 # else
1773 _exit(1);
1774 # endif
1775 }
1776 #else /* HAVE_FORK && HAVE_VFORK */
1777 static void
compress_savefile(const char * filename)1778 compress_savefile(const char *filename)
1779 {
1780 fprintf(stderr,
1781 "compress_savefile failed. Functionality not implemented under your system\n");
1782 }
1783 #endif /* HAVE_FORK && HAVE_VFORK */
1784
1785 static void
dump_packet_and_trunc(u_char * user,const struct pcap_pkthdr * h,const u_char * sp)1786 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1787 {
1788 struct dump_info *dump_info;
1789
1790 ++packets_captured;
1791
1792 ++infodelay;
1793
1794 dump_info = (struct dump_info *)user;
1795
1796 /*
1797 * XXX - this won't force the file to rotate on the specified time
1798 * boundary, but it will rotate on the first packet received after the
1799 * specified Gflag number of seconds. Note: if a Gflag time boundary
1800 * and a Cflag size boundary coincide, the time rotation will occur
1801 * first thereby cancelling the Cflag boundary (since the file should
1802 * be 0).
1803 */
1804 if (Gflag != 0) {
1805 /* Check if it is time to rotate */
1806 time_t t;
1807
1808 /* Get the current time */
1809 if ((t = time(NULL)) == (time_t)-1) {
1810 error("dump_and_trunc_packet: can't get current_time: %s",
1811 pcap_strerror(errno));
1812 }
1813
1814
1815 /* If the time is greater than the specified window, rotate */
1816 if (t - Gflag_time >= Gflag) {
1817 /* Update the Gflag_time */
1818 Gflag_time = t;
1819 /* Update Gflag_count */
1820 Gflag_count++;
1821 /*
1822 * Close the current file and open a new one.
1823 */
1824 pcap_dump_close(dump_info->p);
1825
1826 /*
1827 * Compress the file we just closed, if the user asked for it
1828 */
1829 if (zflag != NULL)
1830 compress_savefile(dump_info->CurrentFileName);
1831
1832 /*
1833 * Check to see if we've exceeded the Wflag (when
1834 * not using Cflag).
1835 */
1836 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1837 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1838 Wflag);
1839 exit(0);
1840 /* NOTREACHED */
1841 }
1842 if (dump_info->CurrentFileName != NULL)
1843 free(dump_info->CurrentFileName);
1844 /* Allocate space for max filename + \0. */
1845 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1846 if (dump_info->CurrentFileName == NULL)
1847 error("dump_packet_and_trunc: malloc");
1848 /*
1849 * This is always the first file in the Cflag
1850 * rotation: e.g. 0
1851 * We also don't need numbering if Cflag is not set.
1852 */
1853 if (Cflag != 0)
1854 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1855 WflagChars);
1856 else
1857 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1858
1859 #ifdef HAVE_CAP_NG_H
1860 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1861 capng_apply(CAPNG_EFFECTIVE);
1862 #endif /* HAVE_CAP_NG_H */
1863 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1864 #ifdef HAVE_CAP_NG_H
1865 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1866 capng_apply(CAPNG_EFFECTIVE);
1867 #endif /* HAVE_CAP_NG_H */
1868 if (dump_info->p == NULL)
1869 error("%s", pcap_geterr(pd));
1870 }
1871 }
1872
1873 /*
1874 * XXX - this won't prevent capture files from getting
1875 * larger than Cflag - the last packet written to the
1876 * file could put it over Cflag.
1877 */
1878 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1879 /*
1880 * Close the current file and open a new one.
1881 */
1882 pcap_dump_close(dump_info->p);
1883
1884 /*
1885 * Compress the file we just closed, if the user asked for it
1886 */
1887 if (zflag != NULL)
1888 compress_savefile(dump_info->CurrentFileName);
1889
1890 Cflag_count++;
1891 if (Wflag > 0) {
1892 if (Cflag_count >= Wflag)
1893 Cflag_count = 0;
1894 }
1895 if (dump_info->CurrentFileName != NULL)
1896 free(dump_info->CurrentFileName);
1897 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
1898 if (dump_info->CurrentFileName == NULL)
1899 error("dump_packet_and_trunc: malloc");
1900 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1901 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1902 if (dump_info->p == NULL)
1903 error("%s", pcap_geterr(pd));
1904 }
1905
1906 pcap_dump((u_char *)dump_info->p, h, sp);
1907 #ifdef HAVE_PCAP_DUMP_FLUSH
1908 if (Uflag)
1909 pcap_dump_flush(dump_info->p);
1910 #endif
1911
1912 --infodelay;
1913 if (infoprint)
1914 info(0);
1915 }
1916
1917 static void
dump_packet(u_char * user,const struct pcap_pkthdr * h,const u_char * sp)1918 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1919 {
1920 ++packets_captured;
1921
1922 ++infodelay;
1923
1924 pcap_dump(user, h, sp);
1925 #ifdef HAVE_PCAP_DUMP_FLUSH
1926 if (Uflag)
1927 pcap_dump_flush((pcap_dumper_t *)user);
1928 #endif
1929
1930 --infodelay;
1931 if (infoprint)
1932 info(0);
1933 }
1934
1935 static void
print_packet(u_char * user,const struct pcap_pkthdr * h,const u_char * sp)1936 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1937 {
1938 struct print_info *print_info;
1939 u_int hdrlen;
1940
1941 ++packets_captured;
1942
1943 ++infodelay;
1944 ts_print(&h->ts);
1945
1946 print_info = (struct print_info *)user;
1947
1948 /*
1949 * Some printers want to check that they're not walking off the
1950 * end of the packet.
1951 * Rather than pass it all the way down, we set this global.
1952 */
1953 snapend = sp + h->caplen;
1954
1955 if(print_info->ndo_type) {
1956 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1957 } else {
1958 hdrlen = (*print_info->p.printer)(h, sp);
1959 }
1960
1961 if (Xflag) {
1962 /*
1963 * Print the raw packet data in hex and ASCII.
1964 */
1965 if (Xflag > 1) {
1966 /*
1967 * Include the link-layer header.
1968 */
1969 hex_and_ascii_print("\n\t", sp, h->caplen);
1970 } else {
1971 /*
1972 * Don't include the link-layer header - and if
1973 * we have nothing past the link-layer header,
1974 * print nothing.
1975 */
1976 if (h->caplen > hdrlen)
1977 hex_and_ascii_print("\n\t", sp + hdrlen,
1978 h->caplen - hdrlen);
1979 }
1980 } else if (xflag) {
1981 /*
1982 * Print the raw packet data in hex.
1983 */
1984 if (xflag > 1) {
1985 /*
1986 * Include the link-layer header.
1987 */
1988 hex_print("\n\t", sp, h->caplen);
1989 } else {
1990 /*
1991 * Don't include the link-layer header - and if
1992 * we have nothing past the link-layer header,
1993 * print nothing.
1994 */
1995 if (h->caplen > hdrlen)
1996 hex_print("\n\t", sp + hdrlen,
1997 h->caplen - hdrlen);
1998 }
1999 } else if (Aflag) {
2000 /*
2001 * Print the raw packet data in ASCII.
2002 */
2003 if (Aflag > 1) {
2004 /*
2005 * Include the link-layer header.
2006 */
2007 ascii_print(sp, h->caplen);
2008 } else {
2009 /*
2010 * Don't include the link-layer header - and if
2011 * we have nothing past the link-layer header,
2012 * print nothing.
2013 */
2014 if (h->caplen > hdrlen)
2015 ascii_print(sp + hdrlen, h->caplen - hdrlen);
2016 }
2017 }
2018
2019 putchar('\n');
2020
2021 --infodelay;
2022 if (infoprint)
2023 info(0);
2024 }
2025
2026 #ifdef WIN32
2027 /*
2028 * XXX - there should really be libpcap calls to get the version
2029 * number as a string (the string would be generated from #defines
2030 * at run time, so that it's not generated from string constants
2031 * in the library, as, on many UNIX systems, those constants would
2032 * be statically linked into the application executable image, and
2033 * would thus reflect the version of libpcap on the system on
2034 * which the application was *linked*, not the system on which it's
2035 * *running*.
2036 *
2037 * That routine should be documented, unlike the "version[]"
2038 * string, so that UNIX vendors providing their own libpcaps
2039 * don't omit it (as a couple of vendors have...).
2040 *
2041 * Packet.dll should perhaps also export a routine to return the
2042 * version number of the Packet.dll code, to supply the
2043 * "Wpcap_version" information on Windows.
2044 */
2045 char WDversion[]="current-cvs.tcpdump.org";
2046 #if !defined(HAVE_GENERATED_VERSION)
2047 char version[]="current-cvs.tcpdump.org";
2048 #endif
2049 char pcap_version[]="current-cvs.tcpdump.org";
2050 char Wpcap_version[]="3.1";
2051 #endif
2052
2053 /*
2054 * By default, print the specified data out in hex and ASCII.
2055 */
2056 static void
ndo_default_print(netdissect_options * ndo _U_,const u_char * bp,u_int length)2057 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
2058 {
2059 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
2060 }
2061
2062 void
default_print(const u_char * bp,u_int length)2063 default_print(const u_char *bp, u_int length)
2064 {
2065 ndo_default_print(gndo, bp, length);
2066 }
2067
2068 #ifdef SIGNAL_REQ_INFO
requestinfo(int signo _U_)2069 RETSIGTYPE requestinfo(int signo _U_)
2070 {
2071 if (infodelay)
2072 ++infoprint;
2073 else
2074 info(0);
2075 }
2076 #endif
2077
2078 /*
2079 * Called once each second in verbose mode while dumping to file
2080 */
2081 #ifdef USE_WIN32_MM_TIMER
verbose_stats_dump(UINT timer_id _U_,UINT msg _U_,DWORD_PTR arg _U_,DWORD_PTR dw1 _U_,DWORD_PTR dw2 _U_)2082 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2083 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2084 {
2085 struct pcap_stat stat;
2086
2087 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2088 fprintf(stderr, "Got %u\r", packets_captured);
2089 }
2090 #elif defined(HAVE_ALARM)
verbose_stats_dump(int sig _U_)2091 static void verbose_stats_dump(int sig _U_)
2092 {
2093 struct pcap_stat stat;
2094
2095 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2096 fprintf(stderr, "Got %u\r", packets_captured);
2097 alarm(1);
2098 }
2099 #endif
2100
2101 static void
usage(void)2102 usage(void)
2103 {
2104 extern char version[];
2105 #ifndef HAVE_PCAP_LIB_VERSION
2106 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2107 extern char pcap_version[];
2108 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2109 static char pcap_version[] = "unknown";
2110 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2111 #endif /* HAVE_PCAP_LIB_VERSION */
2112
2113 #ifdef HAVE_PCAP_LIB_VERSION
2114 #ifdef WIN32
2115 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2116 #else /* WIN32 */
2117 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2118 #endif /* WIN32 */
2119 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2120 #else /* HAVE_PCAP_LIB_VERSION */
2121 #ifdef WIN32
2122 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2123 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2124 #else /* WIN32 */
2125 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2126 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2127 #endif /* WIN32 */
2128 #endif /* HAVE_PCAP_LIB_VERSION */
2129 (void)fprintf(stderr,
2130 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2131 (void)fprintf(stderr,
2132 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2133 (void)fprintf(stderr,
2134 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
2135 #ifdef HAVE_PCAP_SETDIRECTION
2136 (void)fprintf(stderr,
2137 "\t\t[ -Q in|out|inout ]\n");
2138 #endif
2139 (void)fprintf(stderr,
2140 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
2141 (void)fprintf(stderr,
2142 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2143 (void)fprintf(stderr,
2144 "\t\t[ -Z user ] [ expression ]\n");
2145 exit(1);
2146 }
2147
2148
2149
2150 /* VARARGS */
2151 static void
ndo_error(netdissect_options * ndo _U_,const char * fmt,...)2152 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2153 {
2154 va_list ap;
2155
2156 (void)fprintf(stderr, "%s: ", program_name);
2157 va_start(ap, fmt);
2158 (void)vfprintf(stderr, fmt, ap);
2159 va_end(ap);
2160 if (*fmt) {
2161 fmt += strlen(fmt);
2162 if (fmt[-1] != '\n')
2163 (void)fputc('\n', stderr);
2164 }
2165 exit(1);
2166 /* NOTREACHED */
2167 }
2168
2169 /* VARARGS */
2170 static void
ndo_warning(netdissect_options * ndo _U_,const char * fmt,...)2171 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2172 {
2173 va_list ap;
2174
2175 (void)fprintf(stderr, "%s: WARNING: ", program_name);
2176 va_start(ap, fmt);
2177 (void)vfprintf(stderr, fmt, ap);
2178 va_end(ap);
2179 if (*fmt) {
2180 fmt += strlen(fmt);
2181 if (fmt[-1] != '\n')
2182 (void)fputc('\n', stderr);
2183 }
2184 }
2185