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 <[email protected]>
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 - dump traffic on a network
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 <netdissect-stdinc.h>
58
59 #include <sys/stat.h>
60
61 #ifdef HAVE_FCNTL_H
62 #include <fcntl.h>
63 #endif
64
65 #ifdef HAVE_LIBCRYPTO
66 #include <openssl/crypto.h>
67 #endif
68
69 #ifdef HAVE_GETOPT_LONG
70 #include <getopt.h>
71 #else
72 #include "getopt_long.h"
73 #endif
74 /* Capsicum-specific code requires macros from <net/bpf.h>, which will fail
75 * to compile if <pcap.h> has already been included; including the headers
76 * in the opposite order works fine.
77 */
78 #ifdef HAVE_CAPSICUM
79 #include <sys/capsicum.h>
80 #include <sys/nv.h>
81 #include <sys/ioccom.h>
82 #include <net/bpf.h>
83 #include <libgen.h>
84 #ifdef HAVE_CASPER
85 #include <libcasper.h>
86 #include <casper/cap_dns.h>
87 #endif /* HAVE_CASPER */
88 #endif /* HAVE_CAPSICUM */
89 #include <pcap.h>
90 #include <signal.h>
91 #include <stdio.h>
92 #include <stdarg.h>
93 #include <stdlib.h>
94 #include <string.h>
95 #include <limits.h>
96 #ifndef _WIN32
97 #include <sys/wait.h>
98 #include <sys/resource.h>
99 #include <pwd.h>
100 #include <grp.h>
101 #endif /* _WIN32 */
102
103 /* capabilities convenience library */
104 /* If a code depends on HAVE_LIBCAP_NG, it depends also on HAVE_CAP_NG_H.
105 * If HAVE_CAP_NG_H is not defined, undefine HAVE_LIBCAP_NG.
106 * Thus, the later tests are done only on HAVE_LIBCAP_NG.
107 */
108 #ifdef HAVE_LIBCAP_NG
109 #ifdef HAVE_CAP_NG_H
110 #include <cap-ng.h>
111 #else
112 #undef HAVE_LIBCAP_NG
113 #endif /* HAVE_CAP_NG_H */
114 #endif /* HAVE_LIBCAP_NG */
115
116 #ifdef __FreeBSD__
117 #include <sys/sysctl.h>
118 #endif /* __FreeBSD__ */
119
120 #include "netdissect.h"
121 #include "interface.h"
122 #include "addrtoname.h"
123 #include "machdep.h"
124 #include "setsignal.h"
125 #include "gmt2local.h"
126 #include "pcap-missing.h"
127 #include "ascii_strcasecmp.h"
128
129 #include "print.h"
130
131 #ifndef PATH_MAX
132 #define PATH_MAX 1024
133 #endif
134
135 #ifdef SIGINFO
136 #define SIGNAL_REQ_INFO SIGINFO
137 #elif SIGUSR1
138 #define SIGNAL_REQ_INFO SIGUSR1
139 #endif
140
141 static int Bflag; /* buffer size */
142 static long Cflag; /* rotate dump files after this many bytes */
143 static int Cflag_count; /* Keep track of which file number we're writing */
144 static int Dflag; /* list available devices and exit */
145 /*
146 * This is exported because, in some versions of libpcap, if libpcap
147 * is built with optimizer debugging code (which is *NOT* the default
148 * configuration!), the library *imports*(!) a variable named dflag,
149 * under the expectation that tcpdump is exporting it, to govern
150 * how much debugging information to print when optimizing
151 * the generated BPF code.
152 *
153 * This is a horrible hack; newer versions of libpcap don't import
154 * dflag but, instead, *if* built with optimizer debugging code,
155 * *export* a routine to set that flag.
156 */
157 int dflag; /* print filter code */
158 static int Gflag; /* rotate dump files after this many seconds */
159 static int Gflag_count; /* number of files created with Gflag rotation */
160 static time_t Gflag_time; /* The last time_t the dump file was rotated. */
161 static int Lflag; /* list available data link types and exit */
162 static int Iflag; /* rfmon (monitor) mode */
163 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
164 static int Jflag; /* list available time stamp types */
165 #endif
166 static int jflag = -1; /* packet time stamp source */
167 static int pflag; /* don't go promiscuous */
168 #ifdef HAVE_PCAP_SETDIRECTION
169 static int Qflag = -1; /* restrict captured packet by send/receive direction */
170 #endif
171 static int Uflag; /* "unbuffered" output of dump files */
172 static int Wflag; /* recycle output files after this number of files */
173 static int WflagChars;
174 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
175 static int immediate_mode;
176
177 static int infodelay;
178 static int infoprint;
179
180 char *program_name;
181
182 #ifdef HAVE_CASPER
183 cap_channel_t *capdns;
184 #endif
185
186 /* Forwards */
187 static void error(FORMAT_STRING(const char *), ...) NORETURN PRINTFLIKE(1, 2);
188 static void warning(FORMAT_STRING(const char *), ...) PRINTFLIKE(1, 2);
189 static void exit_tcpdump(int) NORETURN;
190 static RETSIGTYPE cleanup(int);
191 static RETSIGTYPE child_cleanup(int);
192 static void print_version(void);
193 static void print_usage(void);
194 static void show_tstamp_types_and_exit(pcap_t *, const char *device) NORETURN;
195 static void show_dlts_and_exit(pcap_t *, const char *device) NORETURN;
196 #ifdef HAVE_PCAP_FINDALLDEVS
197 static void show_devices_and_exit (void) NORETURN;
198 #endif
199
200 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
201 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
202 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
203 static void droproot(const char *, const char *);
204
205 #ifdef SIGNAL_REQ_INFO
206 RETSIGTYPE requestinfo(int);
207 #endif
208
209 #if defined(USE_WIN32_MM_TIMER)
210 #include <MMsystem.h>
211 static UINT timer_id;
212 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
213 #elif defined(HAVE_ALARM)
214 static void verbose_stats_dump(int sig);
215 #endif
216
217 static void info(int);
218 static u_int packets_captured;
219
220 #ifdef HAVE_PCAP_FINDALLDEVS
221 static const struct tok status_flags[] = {
222 #ifdef PCAP_IF_UP
223 { PCAP_IF_UP, "Up" },
224 #endif
225 #ifdef PCAP_IF_RUNNING
226 { PCAP_IF_RUNNING, "Running" },
227 #endif
228 { PCAP_IF_LOOPBACK, "Loopback" },
229 { 0, NULL }
230 };
231 #endif
232
233 static pcap_t *pd;
234
235 static int supports_monitor_mode;
236
237 extern int optind;
238 extern int opterr;
239 extern char *optarg;
240
241 struct dump_info {
242 char *WFileName;
243 char *CurrentFileName;
244 pcap_t *pd;
245 pcap_dumper_t *p;
246 #ifdef HAVE_CAPSICUM
247 int dirfd;
248 #endif
249 };
250
251 #if defined(HAVE_PCAP_SET_PARSER_DEBUG)
252 /*
253 * We have pcap_set_parser_debug() in libpcap; declare it (it's not declared
254 * by any libpcap header, because it's a special hack, only available if
255 * libpcap was configured to include it, and only intended for use by
256 * libpcap developers trying to debug the parser for filter expressions).
257 */
258 #ifdef _WIN32
259 __declspec(dllimport)
260 #else /* _WIN32 */
261 extern
262 #endif /* _WIN32 */
263 void pcap_set_parser_debug(int);
264 #elif defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
265 /*
266 * We don't have pcap_set_parser_debug() in libpcap, but we do have
267 * pcap_debug or yydebug. Make a local version of pcap_set_parser_debug()
268 * to set the flag, and define HAVE_PCAP_SET_PARSER_DEBUG.
269 */
270 static void
pcap_set_parser_debug(int value)271 pcap_set_parser_debug(int value)
272 {
273 #ifdef HAVE_PCAP_DEBUG
274 extern int pcap_debug;
275
276 pcap_debug = value;
277 #else /* HAVE_PCAP_DEBUG */
278 extern int yydebug;
279
280 yydebug = value;
281 #endif /* HAVE_PCAP_DEBUG */
282 }
283
284 #define HAVE_PCAP_SET_PARSER_DEBUG
285 #endif
286
287 #if defined(HAVE_PCAP_SET_OPTIMIZER_DEBUG)
288 /*
289 * We have pcap_set_optimizer_debug() in libpcap; declare it (it's not declared
290 * by any libpcap header, because it's a special hack, only available if
291 * libpcap was configured to include it, and only intended for use by
292 * libpcap developers trying to debug the optimizer for filter expressions).
293 */
294 #ifdef _WIN32
295 __declspec(dllimport)
296 #else /* _WIN32 */
297 extern
298 #endif /* _WIN32 */
299 void pcap_set_optimizer_debug(int);
300 #endif
301
302 /* VARARGS */
303 static void
error(const char * fmt,...)304 error(const char *fmt, ...)
305 {
306 va_list ap;
307
308 (void)fprintf(stderr, "%s: ", program_name);
309 va_start(ap, fmt);
310 (void)vfprintf(stderr, fmt, ap);
311 va_end(ap);
312 if (*fmt) {
313 fmt += strlen(fmt);
314 if (fmt[-1] != '\n')
315 (void)fputc('\n', stderr);
316 }
317 exit_tcpdump(1);
318 /* NOTREACHED */
319 }
320
321 /* VARARGS */
322 static void
warning(const char * fmt,...)323 warning(const char *fmt, ...)
324 {
325 va_list ap;
326
327 (void)fprintf(stderr, "%s: WARNING: ", program_name);
328 va_start(ap, fmt);
329 (void)vfprintf(stderr, fmt, ap);
330 va_end(ap);
331 if (*fmt) {
332 fmt += strlen(fmt);
333 if (fmt[-1] != '\n')
334 (void)fputc('\n', stderr);
335 }
336 }
337
338 static void
exit_tcpdump(int status)339 exit_tcpdump(int status)
340 {
341 nd_cleanup();
342 exit(status);
343 }
344
345 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
346 static void
show_tstamp_types_and_exit(pcap_t * pc,const char * device)347 show_tstamp_types_and_exit(pcap_t *pc, const char *device)
348 {
349 int n_tstamp_types;
350 int *tstamp_types = 0;
351 const char *tstamp_type_name;
352 int i;
353
354 n_tstamp_types = pcap_list_tstamp_types(pc, &tstamp_types);
355 if (n_tstamp_types < 0)
356 error("%s", pcap_geterr(pc));
357
358 if (n_tstamp_types == 0) {
359 fprintf(stderr, "Time stamp type cannot be set for %s\n",
360 device);
361 exit_tcpdump(0);
362 }
363 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
364 device);
365 for (i = 0; i < n_tstamp_types; i++) {
366 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
367 if (tstamp_type_name != NULL) {
368 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
369 pcap_tstamp_type_val_to_description(tstamp_types[i]));
370 } else {
371 (void) fprintf(stderr, " %d\n", tstamp_types[i]);
372 }
373 }
374 pcap_free_tstamp_types(tstamp_types);
375 exit_tcpdump(0);
376 }
377 #endif
378
379 static void
show_dlts_and_exit(pcap_t * pc,const char * device)380 show_dlts_and_exit(pcap_t *pc, const char *device)
381 {
382 int n_dlts, i;
383 int *dlts = 0;
384 const char *dlt_name;
385
386 n_dlts = pcap_list_datalinks(pc, &dlts);
387 if (n_dlts < 0)
388 error("%s", pcap_geterr(pc));
389 else if (n_dlts == 0 || !dlts)
390 error("No data link types.");
391
392 /*
393 * If the interface is known to support monitor mode, indicate
394 * whether these are the data link types available when not in
395 * monitor mode, if -I wasn't specified, or when in monitor mode,
396 * when -I was specified (the link-layer types available in
397 * monitor mode might be different from the ones available when
398 * not in monitor mode).
399 */
400 if (supports_monitor_mode)
401 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
402 device,
403 Iflag ? "when in monitor mode" : "when not in monitor mode");
404 else
405 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
406 device);
407
408 for (i = 0; i < n_dlts; i++) {
409 dlt_name = pcap_datalink_val_to_name(dlts[i]);
410 if (dlt_name != NULL) {
411 (void) fprintf(stderr, " %s (%s)", dlt_name,
412 pcap_datalink_val_to_description(dlts[i]));
413
414 /*
415 * OK, does tcpdump handle that type?
416 */
417 if (!has_printer(dlts[i]))
418 (void) fprintf(stderr, " (printing not supported)");
419 fprintf(stderr, "\n");
420 } else {
421 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
422 dlts[i]);
423 }
424 }
425 #ifdef HAVE_PCAP_FREE_DATALINKS
426 pcap_free_datalinks(dlts);
427 #endif
428 exit_tcpdump(0);
429 }
430
431 #ifdef HAVE_PCAP_FINDALLDEVS
432 static void
show_devices_and_exit(void)433 show_devices_and_exit (void)
434 {
435 pcap_if_t *dev, *devlist;
436 char ebuf[PCAP_ERRBUF_SIZE];
437 int i;
438
439 if (pcap_findalldevs(&devlist, ebuf) < 0)
440 error("%s", ebuf);
441 for (i = 0, dev = devlist; dev != NULL; i++, dev = dev->next) {
442 printf("%d.%s", i+1, dev->name);
443 if (dev->description != NULL)
444 printf(" (%s)", dev->description);
445 if (dev->flags != 0)
446 printf(" [%s]", bittok2str(status_flags, "none", dev->flags));
447 printf("\n");
448 }
449 pcap_freealldevs(devlist);
450 exit_tcpdump(0);
451 }
452 #endif /* HAVE_PCAP_FINDALLDEVS */
453
454 /*
455 * Short options.
456 *
457 * Note that there we use all letters for short options except for g, k,
458 * o, and P, and those are used by other versions of tcpdump, and we should
459 * only use them for the same purposes that the other versions of tcpdump
460 * use them:
461 *
462 * OS X tcpdump uses -g to force non--v output for IP to be on one
463 * line, making it more "g"repable;
464 *
465 * OS X tcpdump uses -k to specify that packet comments in pcap-ng files
466 * should be printed;
467 *
468 * OpenBSD tcpdump uses -o to indicate that OS fingerprinting should be done
469 * for hosts sending TCP SYN packets;
470 *
471 * OS X tcpdump uses -P to indicate that -w should write pcap-ng rather
472 * than pcap files.
473 *
474 * OS X tcpdump also uses -Q to specify expressions that match packet
475 * metadata, including but not limited to the packet direction.
476 * The expression syntax is different from a simple "in|out|inout",
477 * and those expressions aren't accepted by OS X tcpdump, but the
478 * equivalents would be "in" = "dir=in", "out" = "dir=out", and
479 * "inout" = "dir=in or dir=out", and the parser could conceivably
480 * special-case "in", "out", and "inout" as expressions for backwards
481 * compatibility, so all is not (yet) lost.
482 */
483
484 /*
485 * Set up flags that might or might not be supported depending on the
486 * version of libpcap we're using.
487 */
488 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
489 #define B_FLAG "B:"
490 #define B_FLAG_USAGE " [ -B size ]"
491 #else /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
492 #define B_FLAG
493 #define B_FLAG_USAGE
494 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
495
496 #ifdef HAVE_PCAP_CREATE
497 #define I_FLAG "I"
498 #else /* HAVE_PCAP_CREATE */
499 #define I_FLAG
500 #endif /* HAVE_PCAP_CREATE */
501
502 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
503 #define j_FLAG "j:"
504 #define j_FLAG_USAGE " [ -j tstamptype ]"
505 #define J_FLAG "J"
506 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
507 #define j_FLAG
508 #define j_FLAG_USAGE
509 #define J_FLAG
510 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
511
512 #ifdef HAVE_PCAP_FINDALLDEVS
513 #define D_FLAG "D"
514 #else
515 #define D_FLAG
516 #endif
517
518 #ifdef HAVE_PCAP_DUMP_FLUSH
519 #define U_FLAG "U"
520 #else
521 #define U_FLAG
522 #endif
523
524 #ifdef HAVE_PCAP_SETDIRECTION
525 #define Q_FLAG "Q:"
526 #else
527 #define Q_FLAG
528 #endif
529
530 #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:s:StT:u" U_FLAG "vV:w:W:xXy:Yz:Z:#"
531
532 /*
533 * Long options.
534 *
535 * We do not currently have long options corresponding to all short
536 * options; we should probably pick appropriate option names for them.
537 *
538 * However, the short options where the number of times the option is
539 * specified matters, such as -v and -d and -t, should probably not
540 * just map to a long option, as saying
541 *
542 * tcpdump --verbose --verbose
543 *
544 * doesn't make sense; it should be --verbosity={N} or something such
545 * as that.
546 *
547 * For long options with no corresponding short options, we define values
548 * outside the range of ASCII graphic characters, make that the last
549 * component of the entry for the long option, and have a case for that
550 * option in the switch statement.
551 */
552 #define OPTION_VERSION 128
553 #define OPTION_TSTAMP_PRECISION 129
554 #define OPTION_IMMEDIATE_MODE 130
555
556 static const struct option longopts[] = {
557 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
558 { "buffer-size", required_argument, NULL, 'B' },
559 #endif
560 { "list-interfaces", no_argument, NULL, 'D' },
561 { "help", no_argument, NULL, 'h' },
562 { "interface", required_argument, NULL, 'i' },
563 #ifdef HAVE_PCAP_CREATE
564 { "monitor-mode", no_argument, NULL, 'I' },
565 #endif
566 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
567 { "time-stamp-type", required_argument, NULL, 'j' },
568 { "list-time-stamp-types", no_argument, NULL, 'J' },
569 #endif
570 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
571 { "time-stamp-precision", required_argument, NULL, OPTION_TSTAMP_PRECISION},
572 #endif
573 { "dont-verify-checksums", no_argument, NULL, 'K' },
574 { "list-data-link-types", no_argument, NULL, 'L' },
575 { "no-optimize", no_argument, NULL, 'O' },
576 { "no-promiscuous-mode", no_argument, NULL, 'p' },
577 #ifdef HAVE_PCAP_SETDIRECTION
578 { "direction", required_argument, NULL, 'Q' },
579 #endif
580 { "snapshot-length", required_argument, NULL, 's' },
581 { "absolute-tcp-sequence-numbers", no_argument, NULL, 'S' },
582 #ifdef HAVE_PCAP_DUMP_FLUSH
583 { "packet-buffered", no_argument, NULL, 'U' },
584 #endif
585 { "linktype", required_argument, NULL, 'y' },
586 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
587 { "immediate-mode", no_argument, NULL, OPTION_IMMEDIATE_MODE },
588 #endif
589 #ifdef HAVE_PCAP_SET_PARSER_DEBUG
590 { "debug-filter-parser", no_argument, NULL, 'Y' },
591 #endif
592 { "relinquish-privileges", required_argument, NULL, 'Z' },
593 { "number", no_argument, NULL, '#' },
594 { "version", no_argument, NULL, OPTION_VERSION },
595 { NULL, 0, NULL, 0 }
596 };
597
598 #ifndef _WIN32
599 /* Drop root privileges and chroot if necessary */
600 static void
droproot(const char * username,const char * chroot_dir)601 droproot(const char *username, const char *chroot_dir)
602 {
603 struct passwd *pw = NULL;
604
605 if (chroot_dir && !username) {
606 fprintf(stderr, "%s: Chroot without dropping root is insecure\n",
607 program_name);
608 exit_tcpdump(1);
609 }
610
611 pw = getpwnam(username);
612 if (pw) {
613 if (chroot_dir) {
614 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
615 fprintf(stderr, "%s: Couldn't chroot/chdir to '%.64s': %s\n",
616 program_name, chroot_dir, pcap_strerror(errno));
617 exit_tcpdump(1);
618 }
619 }
620 #ifdef HAVE_LIBCAP_NG
621 {
622 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
623 if (ret < 0) {
624 fprintf(stderr, "error : ret %d\n", ret);
625 } else {
626 fprintf(stderr, "dropped privs to %s\n", username);
627 }
628 }
629 #else
630 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
631 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
632 fprintf(stderr, "%s: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
633 program_name, username,
634 (unsigned long)pw->pw_uid,
635 (unsigned long)pw->pw_gid,
636 pcap_strerror(errno));
637 exit_tcpdump(1);
638 }
639 else {
640 fprintf(stderr, "dropped privs to %s\n", username);
641 }
642 #endif /* HAVE_LIBCAP_NG */
643 }
644 else {
645 fprintf(stderr, "%s: Couldn't find user '%.32s'\n",
646 program_name, username);
647 exit_tcpdump(1);
648 }
649 #ifdef HAVE_LIBCAP_NG
650 /* We don't need CAP_SETUID, CAP_SETGID and CAP_SYS_CHROOT any more. */
651 capng_updatev(
652 CAPNG_DROP,
653 CAPNG_EFFECTIVE | CAPNG_PERMITTED,
654 CAP_SETUID,
655 CAP_SETGID,
656 CAP_SYS_CHROOT,
657 -1);
658 capng_apply(CAPNG_SELECT_BOTH);
659 #endif /* HAVE_LIBCAP_NG */
660
661 }
662 #endif /* _WIN32 */
663
664 static int
getWflagChars(int x)665 getWflagChars(int x)
666 {
667 int c = 0;
668
669 x -= 1;
670 while (x > 0) {
671 c += 1;
672 x /= 10;
673 }
674
675 return c;
676 }
677
678
679 static void
MakeFilename(char * buffer,char * orig_name,int cnt,int max_chars)680 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
681 {
682 char *filename = malloc(PATH_MAX + 1);
683 if (filename == NULL)
684 error("Makefilename: malloc");
685
686 /* Process with strftime if Gflag is set. */
687 if (Gflag != 0) {
688 struct tm *local_tm;
689
690 /* Convert Gflag_time to a usable format */
691 if ((local_tm = localtime(&Gflag_time)) == NULL) {
692 error("MakeTimedFilename: localtime");
693 }
694
695 /* There's no good way to detect an error in strftime since a return
696 * value of 0 isn't necessarily failure.
697 */
698 strftime(filename, PATH_MAX, orig_name, local_tm);
699 } else {
700 strncpy(filename, orig_name, PATH_MAX);
701 }
702
703 if (cnt == 0 && max_chars == 0)
704 strncpy(buffer, filename, PATH_MAX + 1);
705 else
706 if (snprintf(buffer, PATH_MAX + 1, "%s%0*d", filename, max_chars, cnt) > PATH_MAX)
707 /* Report an error if the filename is too large */
708 error("too many output files or filename is too long (> %d)", PATH_MAX);
709 free(filename);
710 }
711
712 static char *
get_next_file(FILE * VFile,char * ptr)713 get_next_file(FILE *VFile, char *ptr)
714 {
715 char *ret;
716
717 ret = fgets(ptr, PATH_MAX, VFile);
718 if (!ret)
719 return NULL;
720
721 if (ptr[strlen(ptr) - 1] == '\n')
722 ptr[strlen(ptr) - 1] = '\0';
723
724 return ret;
725 }
726
727 #ifdef HAVE_CASPER
728 static cap_channel_t *
capdns_setup(void)729 capdns_setup(void)
730 {
731 cap_channel_t *capcas, *capdnsloc;
732 const char *types[1];
733 int families[2];
734
735 capcas = cap_init();
736 if (capcas == NULL)
737 error("unable to create casper process");
738 capdnsloc = cap_service_open(capcas, "system.dns");
739 /* Casper capability no longer needed. */
740 cap_close(capcas);
741 if (capdnsloc == NULL)
742 error("unable to open system.dns service");
743 /* Limit system.dns to reverse DNS lookups. */
744 types[0] = "ADDR2NAME";
745 if (cap_dns_type_limit(capdnsloc, types, 1) < 0)
746 error("unable to limit access to system.dns service");
747 families[0] = AF_INET;
748 families[1] = AF_INET6;
749 if (cap_dns_family_limit(capdnsloc, families, 2) < 0)
750 error("unable to limit access to system.dns service");
751
752 return (capdnsloc);
753 }
754 #endif /* HAVE_CASPER */
755
756 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
757 static int
tstamp_precision_from_string(const char * precision)758 tstamp_precision_from_string(const char *precision)
759 {
760 if (strncmp(precision, "nano", strlen("nano")) == 0)
761 return PCAP_TSTAMP_PRECISION_NANO;
762
763 if (strncmp(precision, "micro", strlen("micro")) == 0)
764 return PCAP_TSTAMP_PRECISION_MICRO;
765
766 return -EINVAL;
767 }
768
769 static const char *
tstamp_precision_to_string(int precision)770 tstamp_precision_to_string(int precision)
771 {
772 switch (precision) {
773
774 case PCAP_TSTAMP_PRECISION_MICRO:
775 return "micro";
776
777 case PCAP_TSTAMP_PRECISION_NANO:
778 return "nano";
779
780 default:
781 return "unknown";
782 }
783 }
784 #endif
785
786 #ifdef HAVE_CAPSICUM
787 /*
788 * Ensure that, on a dump file's descriptor, we have all the rights
789 * necessary to make the standard I/O library work with an fdopen()ed
790 * FILE * from that descriptor.
791 *
792 * A long time ago, in a galaxy far far away, AT&T decided that, instead
793 * of providing separate APIs for getting and setting the FD_ flags on a
794 * descriptor, getting and setting the O_ flags on a descriptor, and
795 * locking files, they'd throw them all into a kitchen-sink fcntl() call
796 * along the lines of ioctl(), the fact that ioctl() operations are
797 * largely specific to particular character devices but fcntl() operations
798 * are either generic to all descriptors or generic to all descriptors for
799 * regular files nonwithstanding.
800 *
801 * The Capsicum people decided that fine-grained control of descriptor
802 * operations was required, so that you need to grant permission for
803 * reading, writing, seeking, and fcntl-ing. The latter, courtesy of
804 * AT&T's decision, means that "fcntl-ing" isn't a thing, but a motley
805 * collection of things, so there are *individual* fcntls for which
806 * permission needs to be granted.
807 *
808 * The FreeBSD standard I/O people implemented some optimizations that
809 * requires that the standard I/O routines be able to determine whether
810 * the descriptor for the FILE * is open append-only or not; as that
811 * descriptor could have come from an open() rather than an fopen(),
812 * that requires that it be able to do an F_GETFL fcntl() to read
813 * the O_ flags.
814 *
815 * Tcpdump uses ftell() to determine how much data has been written
816 * to a file in order to, when used with -C, determine when it's time
817 * to rotate capture files. ftell() therefore needs to do an lseek()
818 * to find out the file offset and must, thanks to the aforementioned
819 * optimization, also know whether the descriptor is open append-only
820 * or not.
821 *
822 * The net result of all the above is that we need to grant CAP_SEEK,
823 * CAP_WRITE, and CAP_FCNTL with the CAP_FCNTL_GETFL subcapability.
824 *
825 * Perhaps this is the universe's way of saying that either
826 *
827 * 1) there needs to be an fopenat() call and a pcap_dump_openat() call
828 * using it, so that Capsicum-capable tcpdump wouldn't need to do
829 * an fdopen()
830 *
831 * or
832 *
833 * 2) there needs to be a cap_fdopen() call in the FreeBSD standard
834 * I/O library that knows what rights are needed by the standard
835 * I/O library, based on the open mode, and assigns them, perhaps
836 * with an additional argument indicating, for example, whether
837 * seeking should be allowed, so that tcpdump doesn't need to know
838 * what the standard I/O library happens to require this week.
839 */
840 static void
set_dumper_capsicum_rights(pcap_dumper_t * p)841 set_dumper_capsicum_rights(pcap_dumper_t *p)
842 {
843 int fd = fileno(pcap_dump_file(p));
844 cap_rights_t rights;
845
846 cap_rights_init(&rights, CAP_SEEK, CAP_WRITE, CAP_FCNTL);
847 if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) {
848 error("unable to limit dump descriptor");
849 }
850 if (cap_fcntls_limit(fd, CAP_FCNTL_GETFL) < 0 && errno != ENOSYS) {
851 error("unable to limit dump descriptor fcntls");
852 }
853 }
854 #endif
855
856 /*
857 * Copy arg vector into a new buffer, concatenating arguments with spaces.
858 */
859 static char *
copy_argv(register char ** argv)860 copy_argv(register char **argv)
861 {
862 register char **p;
863 register u_int len = 0;
864 char *buf;
865 char *src, *dst;
866
867 p = argv;
868 if (*p == NULL)
869 return 0;
870
871 while (*p)
872 len += strlen(*p++) + 1;
873
874 buf = (char *)malloc(len);
875 if (buf == NULL)
876 error("copy_argv: malloc");
877
878 p = argv;
879 dst = buf;
880 while ((src = *p++) != NULL) {
881 while ((*dst++ = *src++) != '\0')
882 ;
883 dst[-1] = ' ';
884 }
885 dst[-1] = '\0';
886
887 return buf;
888 }
889
890 /*
891 * On Windows, we need to open the file in binary mode, so that
892 * we get all the bytes specified by the size we get from "fstat()".
893 * On UNIX, that's not necessary. O_BINARY is defined on Windows;
894 * we define it as 0 if it's not defined, so it does nothing.
895 */
896 #ifndef O_BINARY
897 #define O_BINARY 0
898 #endif
899
900 static char *
read_infile(char * fname)901 read_infile(char *fname)
902 {
903 register int i, fd, cc;
904 register char *cp;
905 struct stat buf;
906
907 fd = open(fname, O_RDONLY|O_BINARY);
908 if (fd < 0)
909 error("can't open %s: %s", fname, pcap_strerror(errno));
910
911 if (fstat(fd, &buf) < 0)
912 error("can't stat %s: %s", fname, pcap_strerror(errno));
913
914 cp = malloc((u_int)buf.st_size + 1);
915 if (cp == NULL)
916 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
917 fname, pcap_strerror(errno));
918 cc = read(fd, cp, (u_int)buf.st_size);
919 if (cc < 0)
920 error("read %s: %s", fname, pcap_strerror(errno));
921 if (cc != buf.st_size)
922 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
923
924 close(fd);
925 /* replace "# comment" with spaces */
926 for (i = 0; i < cc; i++) {
927 if (cp[i] == '#')
928 while (i < cc && cp[i] != '\n')
929 cp[i++] = ' ';
930 }
931 cp[cc] = '\0';
932 return (cp);
933 }
934
935 #ifdef HAVE_PCAP_FINDALLDEVS
936 static long
parse_interface_number(const char * device)937 parse_interface_number(const char *device)
938 {
939 long devnum;
940 char *end;
941
942 devnum = strtol(device, &end, 10);
943 if (device != end && *end == '\0') {
944 /*
945 * It's all-numeric, but is it a valid number?
946 */
947 if (devnum <= 0) {
948 /*
949 * No, it's not an ordinal.
950 */
951 error("Invalid adapter index");
952 }
953 return (devnum);
954 } else {
955 /*
956 * It's not all-numeric; return -1, so our caller
957 * knows that.
958 */
959 return (-1);
960 }
961 }
962
963 static char *
find_interface_by_number(long devnum)964 find_interface_by_number(long devnum)
965 {
966 pcap_if_t *dev, *devlist;
967 long i;
968 char ebuf[PCAP_ERRBUF_SIZE];
969 char *device;
970
971 if (pcap_findalldevs(&devlist, ebuf) < 0)
972 error("%s", ebuf);
973 /*
974 * Look for the devnum-th entry in the list of devices (1-based).
975 */
976 for (i = 0, dev = devlist; i < devnum-1 && dev != NULL;
977 i++, dev = dev->next)
978 ;
979 if (dev == NULL)
980 error("Invalid adapter index");
981 device = strdup(dev->name);
982 pcap_freealldevs(devlist);
983 return (device);
984 }
985 #endif
986
987 static pcap_t *
open_interface(const char * device,netdissect_options * ndo,char * ebuf)988 open_interface(const char *device, netdissect_options *ndo, char *ebuf)
989 {
990 pcap_t *pc;
991 #ifdef HAVE_PCAP_CREATE
992 int status;
993 char *cp;
994 #endif
995
996 #ifdef HAVE_PCAP_CREATE
997 pc = pcap_create(device, ebuf);
998 if (pc == NULL) {
999 /*
1000 * If this failed with "No such device", that means
1001 * the interface doesn't exist; return NULL, so that
1002 * the caller can see whether the device name is
1003 * actually an interface index.
1004 */
1005 if (strstr(ebuf, "No such device") != NULL)
1006 return (NULL);
1007 error("%s", ebuf);
1008 }
1009 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1010 if (Jflag)
1011 show_tstamp_types_and_exit(pc, device);
1012 #endif
1013 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1014 status = pcap_set_tstamp_precision(pc, ndo->ndo_tstamp_precision);
1015 if (status != 0)
1016 error("%s: Can't set %ssecond time stamp precision: %s",
1017 device,
1018 tstamp_precision_to_string(ndo->ndo_tstamp_precision),
1019 pcap_statustostr(status));
1020 #endif
1021
1022 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1023 if (immediate_mode) {
1024 status = pcap_set_immediate_mode(pc, 1);
1025 if (status != 0)
1026 error("%s: Can't set immediate mode: %s",
1027 device,
1028 pcap_statustostr(status));
1029 }
1030 #endif
1031 /*
1032 * Is this an interface that supports monitor mode?
1033 */
1034 if (pcap_can_set_rfmon(pc) == 1)
1035 supports_monitor_mode = 1;
1036 else
1037 supports_monitor_mode = 0;
1038 status = pcap_set_snaplen(pc, ndo->ndo_snaplen);
1039 if (status != 0)
1040 error("%s: Can't set snapshot length: %s",
1041 device, pcap_statustostr(status));
1042 status = pcap_set_promisc(pc, !pflag);
1043 if (status != 0)
1044 error("%s: Can't set promiscuous mode: %s",
1045 device, pcap_statustostr(status));
1046 if (Iflag) {
1047 status = pcap_set_rfmon(pc, 1);
1048 if (status != 0)
1049 error("%s: Can't set monitor mode: %s",
1050 device, pcap_statustostr(status));
1051 }
1052 status = pcap_set_timeout(pc, 1000);
1053 if (status != 0)
1054 error("%s: pcap_set_timeout failed: %s",
1055 device, pcap_statustostr(status));
1056 if (Bflag != 0) {
1057 status = pcap_set_buffer_size(pc, Bflag);
1058 if (status != 0)
1059 error("%s: Can't set buffer size: %s",
1060 device, pcap_statustostr(status));
1061 }
1062 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1063 if (jflag != -1) {
1064 status = pcap_set_tstamp_type(pc, jflag);
1065 if (status < 0)
1066 error("%s: Can't set time stamp type: %s",
1067 device, pcap_statustostr(status));
1068 }
1069 #endif
1070 status = pcap_activate(pc);
1071 if (status < 0) {
1072 /*
1073 * pcap_activate() failed.
1074 */
1075 cp = pcap_geterr(pc);
1076 if (status == PCAP_ERROR)
1077 error("%s", cp);
1078 else if (status == PCAP_ERROR_NO_SUCH_DEVICE) {
1079 /*
1080 * Return an error for our caller to handle.
1081 */
1082 snprintf(ebuf, PCAP_ERRBUF_SIZE, "%s: %s\n(%s)",
1083 device, pcap_statustostr(status), cp);
1084 pcap_close(pc);
1085 return (NULL);
1086 } else if (status == PCAP_ERROR_PERM_DENIED && *cp != '\0')
1087 error("%s: %s\n(%s)", device,
1088 pcap_statustostr(status), cp);
1089 #ifdef __FreeBSD__
1090 else if (status == PCAP_ERROR_RFMON_NOTSUP &&
1091 strncmp(device, "wlan", 4) == 0) {
1092 char parent[8], newdev[8];
1093 char sysctl[32];
1094 size_t s = sizeof(parent);
1095
1096 snprintf(sysctl, sizeof(sysctl),
1097 "net.wlan.%d.%%parent", atoi(device + 4));
1098 sysctlbyname(sysctl, parent, &s, NULL, 0);
1099 strlcpy(newdev, device, sizeof(newdev));
1100 /* Suggest a new wlan device. */
1101 /* FIXME: incrementing the index this way is not going to work well
1102 * when the index is 9 or greater but the only consequence in this
1103 * specific case would be an error message that looks a bit odd.
1104 */
1105 newdev[strlen(newdev)-1]++;
1106 error("%s is not a monitor mode VAP\n"
1107 "To create a new monitor mode VAP use:\n"
1108 " ifconfig %s create wlandev %s wlanmode monitor\n"
1109 "and use %s as the tcpdump interface",
1110 device, newdev, parent, newdev);
1111 }
1112 #endif
1113 else
1114 error("%s: %s", device,
1115 pcap_statustostr(status));
1116 } else if (status > 0) {
1117 /*
1118 * pcap_activate() succeeded, but it's warning us
1119 * of a problem it had.
1120 */
1121 cp = pcap_geterr(pc);
1122 if (status == PCAP_WARNING)
1123 warning("%s", cp);
1124 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1125 *cp != '\0')
1126 warning("%s: %s\n(%s)", device,
1127 pcap_statustostr(status), cp);
1128 else
1129 warning("%s: %s", device,
1130 pcap_statustostr(status));
1131 }
1132 #ifdef HAVE_PCAP_SETDIRECTION
1133 if (Qflag != -1) {
1134 status = pcap_setdirection(pc, Qflag);
1135 if (status != 0)
1136 error("%s: pcap_setdirection() failed: %s",
1137 device, pcap_geterr(pc));
1138 }
1139 #endif /* HAVE_PCAP_SETDIRECTION */
1140 #else /* HAVE_PCAP_CREATE */
1141 *ebuf = '\0';
1142 pc = pcap_open_live(device, ndo->ndo_snaplen, !pflag, 1000, ebuf);
1143 if (pc == NULL) {
1144 /*
1145 * If this failed with "No such device", that means
1146 * the interface doesn't exist; return NULL, so that
1147 * the caller can see whether the device name is
1148 * actually an interface index.
1149 */
1150 if (strstr(ebuf, "No such device") != NULL)
1151 return (NULL);
1152 error("%s", ebuf);
1153 }
1154 if (*ebuf)
1155 warning("%s", ebuf);
1156 #endif /* HAVE_PCAP_CREATE */
1157
1158 return (pc);
1159 }
1160
1161 int
main(int argc,char ** argv)1162 main(int argc, char **argv)
1163 {
1164 register int cnt, op, i;
1165 bpf_u_int32 localnet =0 , netmask = 0;
1166 int timezone_offset = 0;
1167 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
1168 pcap_handler callback;
1169 int dlt;
1170 const char *dlt_name;
1171 struct bpf_program fcode;
1172 #ifndef _WIN32
1173 RETSIGTYPE (*oldhandler)(int);
1174 #endif
1175 struct dump_info dumpinfo;
1176 u_char *pcap_userdata;
1177 char ebuf[PCAP_ERRBUF_SIZE];
1178 char VFileLine[PATH_MAX + 1];
1179 char *username = NULL;
1180 char *chroot_dir = NULL;
1181 char *ret = NULL;
1182 char *end;
1183 #ifdef HAVE_PCAP_FINDALLDEVS
1184 pcap_if_t *devlist;
1185 long devnum;
1186 #endif
1187 int status;
1188 FILE *VFile;
1189 #ifdef HAVE_CAPSICUM
1190 cap_rights_t rights;
1191 int cansandbox;
1192 #endif /* HAVE_CAPSICUM */
1193 int Oflag = 1; /* run filter code optimizer */
1194 int yflag_dlt = -1;
1195 const char *yflag_dlt_name = NULL;
1196
1197 netdissect_options Ndo;
1198 netdissect_options *ndo = &Ndo;
1199
1200 /*
1201 * Initialize the netdissect code.
1202 */
1203 if (nd_init(ebuf, sizeof ebuf) == -1)
1204 error("%s", ebuf);
1205
1206 memset(ndo, 0, sizeof(*ndo));
1207 ndo_set_function_pointers(ndo);
1208 ndo->ndo_snaplen = DEFAULT_SNAPLEN;
1209
1210 cnt = -1;
1211 device = NULL;
1212 infile = NULL;
1213 RFileName = NULL;
1214 VFileName = NULL;
1215 VFile = NULL;
1216 WFileName = NULL;
1217 dlt = -1;
1218 if ((cp = strrchr(argv[0], '/')) != NULL)
1219 ndo->program_name = program_name = cp + 1;
1220 else
1221 ndo->program_name = program_name = argv[0];
1222
1223 #ifdef _WIN32
1224 if (pcap_wsockinit() != 0)
1225 error("Attempting to initialize Winsock failed");
1226 #endif /* _WIN32 */
1227
1228 /*
1229 * On platforms where the CPU doesn't support unaligned loads,
1230 * force unaligned accesses to abort with SIGBUS, rather than
1231 * being fixed up (slowly) by the OS kernel; on those platforms,
1232 * misaligned accesses are bugs, and we want tcpdump to crash so
1233 * that the bugs are reported.
1234 */
1235 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
1236 error("%s", ebuf);
1237
1238 while (
1239 (op = getopt_long(argc, argv, SHORTOPTS, longopts, NULL)) != -1)
1240 switch (op) {
1241
1242 case 'a':
1243 /* compatibility for old -a */
1244 break;
1245
1246 case 'A':
1247 ++ndo->ndo_Aflag;
1248 break;
1249
1250 case 'b':
1251 ++ndo->ndo_bflag;
1252 break;
1253
1254 #if defined(HAVE_PCAP_CREATE) || defined(_WIN32)
1255 case 'B':
1256 Bflag = atoi(optarg)*1024;
1257 if (Bflag <= 0)
1258 error("invalid packet buffer size %s", optarg);
1259 break;
1260 #endif /* defined(HAVE_PCAP_CREATE) || defined(_WIN32) */
1261
1262 case 'c':
1263 cnt = atoi(optarg);
1264 if (cnt <= 0)
1265 error("invalid packet count %s", optarg);
1266 break;
1267
1268 case 'C':
1269 Cflag = atoi(optarg) * 1000000;
1270 if (Cflag <= 0)
1271 error("invalid file size %s", optarg);
1272 break;
1273
1274 case 'd':
1275 ++dflag;
1276 break;
1277
1278 case 'D':
1279 Dflag++;
1280 break;
1281
1282 case 'L':
1283 Lflag++;
1284 break;
1285
1286 case 'e':
1287 ++ndo->ndo_eflag;
1288 break;
1289
1290 case 'E':
1291 #ifndef HAVE_LIBCRYPTO
1292 warning("crypto code not compiled in");
1293 #endif
1294 ndo->ndo_espsecret = optarg;
1295 break;
1296
1297 case 'f':
1298 ++ndo->ndo_fflag;
1299 break;
1300
1301 case 'F':
1302 infile = optarg;
1303 break;
1304
1305 case 'G':
1306 Gflag = atoi(optarg);
1307 if (Gflag < 0)
1308 error("invalid number of seconds %s", optarg);
1309
1310 /* We will create one file initially. */
1311 Gflag_count = 0;
1312
1313 /* Grab the current time for rotation use. */
1314 if ((Gflag_time = time(NULL)) == (time_t)-1) {
1315 error("main: can't get current time: %s",
1316 pcap_strerror(errno));
1317 }
1318 break;
1319
1320 case 'h':
1321 print_usage();
1322 exit_tcpdump(0);
1323 break;
1324
1325 case 'H':
1326 ++ndo->ndo_Hflag;
1327 break;
1328
1329 case 'i':
1330 device = optarg;
1331 break;
1332
1333 #ifdef HAVE_PCAP_CREATE
1334 case 'I':
1335 ++Iflag;
1336 break;
1337 #endif /* HAVE_PCAP_CREATE */
1338
1339 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1340 case 'j':
1341 jflag = pcap_tstamp_type_name_to_val(optarg);
1342 if (jflag < 0)
1343 error("invalid time stamp type %s", optarg);
1344 break;
1345
1346 case 'J':
1347 Jflag++;
1348 break;
1349 #endif
1350
1351 case 'l':
1352 #ifdef _WIN32
1353 /*
1354 * _IOLBF is the same as _IOFBF in Microsoft's C
1355 * libraries; the only alternative they offer
1356 * is _IONBF.
1357 *
1358 * XXX - this should really be checking for MSVC++,
1359 * not _WIN32, if, for example, MinGW has its own
1360 * C library that is more UNIX-compatible.
1361 */
1362 setvbuf(stdout, NULL, _IONBF, 0);
1363 #else /* _WIN32 */
1364 #ifdef HAVE_SETLINEBUF
1365 setlinebuf(stdout);
1366 #else
1367 setvbuf(stdout, NULL, _IOLBF, 0);
1368 #endif
1369 #endif /* _WIN32 */
1370 break;
1371
1372 case 'K':
1373 ++ndo->ndo_Kflag;
1374 break;
1375
1376 case 'm':
1377 if (nd_have_smi_support()) {
1378 if (nd_load_smi_module(optarg, ebuf, sizeof ebuf) == -1)
1379 error("%s", ebuf);
1380 } else {
1381 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
1382 program_name, optarg);
1383 (void)fprintf(stderr, "(no libsmi support)\n");
1384 }
1385 break;
1386
1387 case 'M':
1388 /* TCP-MD5 shared secret */
1389 #ifndef HAVE_LIBCRYPTO
1390 warning("crypto code not compiled in");
1391 #endif
1392 ndo->ndo_sigsecret = optarg;
1393 break;
1394
1395 case 'n':
1396 ++ndo->ndo_nflag;
1397 break;
1398
1399 case 'N':
1400 ++ndo->ndo_Nflag;
1401 break;
1402
1403 case 'O':
1404 Oflag = 0;
1405 break;
1406
1407 case 'p':
1408 ++pflag;
1409 break;
1410
1411 case 'q':
1412 ++ndo->ndo_qflag;
1413 ++ndo->ndo_suppress_default_print;
1414 break;
1415
1416 #ifdef HAVE_PCAP_SETDIRECTION
1417 case 'Q':
1418 if (ascii_strcasecmp(optarg, "in") == 0)
1419 Qflag = PCAP_D_IN;
1420 else if (ascii_strcasecmp(optarg, "out") == 0)
1421 Qflag = PCAP_D_OUT;
1422 else if (ascii_strcasecmp(optarg, "inout") == 0)
1423 Qflag = PCAP_D_INOUT;
1424 else
1425 error("unknown capture direction `%s'", optarg);
1426 break;
1427 #endif /* HAVE_PCAP_SETDIRECTION */
1428
1429 case 'r':
1430 RFileName = optarg;
1431 break;
1432
1433 case 's':
1434 ndo->ndo_snaplen = strtol(optarg, &end, 0);
1435 if (optarg == end || *end != '\0'
1436 || ndo->ndo_snaplen < 0 || ndo->ndo_snaplen > MAXIMUM_SNAPLEN)
1437 error("invalid snaplen %s", optarg);
1438 else if (ndo->ndo_snaplen == 0)
1439 ndo->ndo_snaplen = MAXIMUM_SNAPLEN;
1440 break;
1441
1442 case 'S':
1443 ++ndo->ndo_Sflag;
1444 break;
1445
1446 case 't':
1447 ++ndo->ndo_tflag;
1448 break;
1449
1450 case 'T':
1451 if (ascii_strcasecmp(optarg, "vat") == 0)
1452 ndo->ndo_packettype = PT_VAT;
1453 else if (ascii_strcasecmp(optarg, "wb") == 0)
1454 ndo->ndo_packettype = PT_WB;
1455 else if (ascii_strcasecmp(optarg, "rpc") == 0)
1456 ndo->ndo_packettype = PT_RPC;
1457 else if (ascii_strcasecmp(optarg, "rtp") == 0)
1458 ndo->ndo_packettype = PT_RTP;
1459 else if (ascii_strcasecmp(optarg, "rtcp") == 0)
1460 ndo->ndo_packettype = PT_RTCP;
1461 else if (ascii_strcasecmp(optarg, "snmp") == 0)
1462 ndo->ndo_packettype = PT_SNMP;
1463 else if (ascii_strcasecmp(optarg, "cnfp") == 0)
1464 ndo->ndo_packettype = PT_CNFP;
1465 else if (ascii_strcasecmp(optarg, "tftp") == 0)
1466 ndo->ndo_packettype = PT_TFTP;
1467 else if (ascii_strcasecmp(optarg, "aodv") == 0)
1468 ndo->ndo_packettype = PT_AODV;
1469 else if (ascii_strcasecmp(optarg, "carp") == 0)
1470 ndo->ndo_packettype = PT_CARP;
1471 else if (ascii_strcasecmp(optarg, "radius") == 0)
1472 ndo->ndo_packettype = PT_RADIUS;
1473 else if (ascii_strcasecmp(optarg, "zmtp1") == 0)
1474 ndo->ndo_packettype = PT_ZMTP1;
1475 else if (ascii_strcasecmp(optarg, "vxlan") == 0)
1476 ndo->ndo_packettype = PT_VXLAN;
1477 else if (ascii_strcasecmp(optarg, "pgm") == 0)
1478 ndo->ndo_packettype = PT_PGM;
1479 else if (ascii_strcasecmp(optarg, "pgm_zmtp1") == 0)
1480 ndo->ndo_packettype = PT_PGM_ZMTP1;
1481 else if (ascii_strcasecmp(optarg, "lmp") == 0)
1482 ndo->ndo_packettype = PT_LMP;
1483 else if (ascii_strcasecmp(optarg, "resp") == 0)
1484 ndo->ndo_packettype = PT_RESP;
1485 else
1486 error("unknown packet type `%s'", optarg);
1487 break;
1488
1489 case 'u':
1490 ++ndo->ndo_uflag;
1491 break;
1492
1493 #ifdef HAVE_PCAP_DUMP_FLUSH
1494 case 'U':
1495 ++Uflag;
1496 break;
1497 #endif
1498
1499 case 'v':
1500 ++ndo->ndo_vflag;
1501 break;
1502
1503 case 'V':
1504 VFileName = optarg;
1505 break;
1506
1507 case 'w':
1508 WFileName = optarg;
1509 break;
1510
1511 case 'W':
1512 Wflag = atoi(optarg);
1513 if (Wflag <= 0)
1514 error("invalid number of output files %s", optarg);
1515 WflagChars = getWflagChars(Wflag);
1516 break;
1517
1518 case 'x':
1519 ++ndo->ndo_xflag;
1520 ++ndo->ndo_suppress_default_print;
1521 break;
1522
1523 case 'X':
1524 ++ndo->ndo_Xflag;
1525 ++ndo->ndo_suppress_default_print;
1526 break;
1527
1528 case 'y':
1529 yflag_dlt_name = optarg;
1530 yflag_dlt =
1531 pcap_datalink_name_to_val(yflag_dlt_name);
1532 if (yflag_dlt < 0)
1533 error("invalid data link type %s", yflag_dlt_name);
1534 break;
1535
1536 #ifdef HAVE_PCAP_SET_PARSER_DEBUG
1537 case 'Y':
1538 {
1539 /* Undocumented flag */
1540 pcap_set_parser_debug(1);
1541 }
1542 break;
1543 #endif
1544 case 'z':
1545 zflag = optarg;
1546 break;
1547
1548 case 'Z':
1549 username = optarg;
1550 break;
1551
1552 case '#':
1553 ndo->ndo_packet_number = 1;
1554 break;
1555
1556 case OPTION_VERSION:
1557 print_version();
1558 exit_tcpdump(0);
1559 break;
1560
1561 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1562 case OPTION_TSTAMP_PRECISION:
1563 ndo->ndo_tstamp_precision = tstamp_precision_from_string(optarg);
1564 if (ndo->ndo_tstamp_precision < 0)
1565 error("unsupported time stamp precision");
1566 break;
1567 #endif
1568
1569 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1570 case OPTION_IMMEDIATE_MODE:
1571 immediate_mode = 1;
1572 break;
1573 #endif
1574
1575 default:
1576 print_usage();
1577 exit_tcpdump(1);
1578 /* NOTREACHED */
1579 }
1580
1581 #ifdef HAVE_PCAP_FINDALLDEVS
1582 if (Dflag)
1583 show_devices_and_exit();
1584 #endif
1585
1586 switch (ndo->ndo_tflag) {
1587
1588 case 0: /* Default */
1589 case 4: /* Default + Date*/
1590 timezone_offset = gmt2local(0);
1591 break;
1592
1593 case 1: /* No time stamp */
1594 case 2: /* Unix timeval style */
1595 case 3: /* Microseconds since previous packet */
1596 case 5: /* Microseconds since first packet */
1597 break;
1598
1599 default: /* Not supported */
1600 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1601 break;
1602 }
1603
1604 if (ndo->ndo_fflag != 0 && (VFileName != NULL || RFileName != NULL))
1605 error("-f can not be used with -V or -r");
1606
1607 if (VFileName != NULL && RFileName != NULL)
1608 error("-V and -r are mutually exclusive.");
1609
1610 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
1611 /*
1612 * If we're printing dissected packets to the standard output
1613 * rather than saving raw packets to a file, and the standard
1614 * output is a terminal, use immediate mode, as the user's
1615 * probably expecting to see packets pop up immediately.
1616 */
1617 if (WFileName == NULL && isatty(1))
1618 immediate_mode = 1;
1619 #endif
1620
1621 #ifdef WITH_CHROOT
1622 /* if run as root, prepare for chrooting */
1623 if (getuid() == 0 || geteuid() == 0) {
1624 /* future extensibility for cmd-line arguments */
1625 if (!chroot_dir)
1626 chroot_dir = WITH_CHROOT;
1627 }
1628 #endif
1629
1630 #ifdef WITH_USER
1631 /* if run as root, prepare for dropping root privileges */
1632 if (getuid() == 0 || geteuid() == 0) {
1633 /* Run with '-Z root' to restore old behaviour */
1634 if (!username)
1635 username = WITH_USER;
1636 }
1637 #endif
1638
1639 if (RFileName != NULL || VFileName != NULL) {
1640 /*
1641 * If RFileName is non-null, it's the pathname of a
1642 * savefile to read. If VFileName is non-null, it's
1643 * the pathname of a file containing a list of pathnames
1644 * (one per line) of savefiles to read.
1645 *
1646 * In either case, we're reading a savefile, not doing
1647 * a live capture.
1648 */
1649 #ifndef _WIN32
1650 /*
1651 * We don't need network access, so relinquish any set-UID
1652 * or set-GID privileges we have (if any).
1653 *
1654 * We do *not* want set-UID privileges when opening a
1655 * trace file, as that might let the user read other
1656 * people's trace files (especially if we're set-UID
1657 * root).
1658 */
1659 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1660 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1661 #endif /* _WIN32 */
1662 if (VFileName != NULL) {
1663 if (VFileName[0] == '-' && VFileName[1] == '\0')
1664 VFile = stdin;
1665 else
1666 VFile = fopen(VFileName, "r");
1667
1668 if (VFile == NULL)
1669 error("Unable to open file: %s\n", pcap_strerror(errno));
1670
1671 ret = get_next_file(VFile, VFileLine);
1672 if (!ret)
1673 error("Nothing in %s\n", VFileName);
1674 RFileName = VFileLine;
1675 }
1676
1677 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
1678 pd = pcap_open_offline_with_tstamp_precision(RFileName,
1679 ndo->ndo_tstamp_precision, ebuf);
1680 #else
1681 pd = pcap_open_offline(RFileName, ebuf);
1682 #endif
1683
1684 if (pd == NULL)
1685 error("%s", ebuf);
1686 #ifdef HAVE_CAPSICUM
1687 cap_rights_init(&rights, CAP_READ);
1688 if (cap_rights_limit(fileno(pcap_file(pd)), &rights) < 0 &&
1689 errno != ENOSYS) {
1690 error("unable to limit pcap descriptor");
1691 }
1692 #endif
1693 dlt = pcap_datalink(pd);
1694 dlt_name = pcap_datalink_val_to_name(dlt);
1695 if (dlt_name == NULL) {
1696 fprintf(stderr, "reading from file %s, link-type %u\n",
1697 RFileName, dlt);
1698 } else {
1699 fprintf(stderr,
1700 "reading from file %s, link-type %s (%s)\n",
1701 RFileName, dlt_name,
1702 pcap_datalink_val_to_description(dlt));
1703 }
1704 } else {
1705 /*
1706 * We're doing a live capture.
1707 */
1708 if (device == NULL) {
1709 /*
1710 * No interface was specified. Pick one.
1711 */
1712 #ifdef HAVE_PCAP_FINDALLDEVS
1713 /*
1714 * Find the list of interfaces, and pick
1715 * the first interface.
1716 */
1717 if (pcap_findalldevs(&devlist, ebuf) >= 0 &&
1718 devlist != NULL) {
1719 device = strdup(devlist->name);
1720 pcap_freealldevs(devlist);
1721 }
1722 #else /* HAVE_PCAP_FINDALLDEVS */
1723 /*
1724 * Use whatever interface pcap_lookupdev()
1725 * chooses.
1726 */
1727 device = pcap_lookupdev(ebuf);
1728 #endif
1729 if (device == NULL)
1730 error("%s", ebuf);
1731 }
1732
1733 /*
1734 * Try to open the interface with the specified name.
1735 */
1736 pd = open_interface(device, ndo, ebuf);
1737 if (pd == NULL) {
1738 /*
1739 * That failed. If we can get a list of
1740 * interfaces, and the interface name
1741 * is purely numeric, try to use it as
1742 * a 1-based index in the list of
1743 * interfaces.
1744 */
1745 #ifdef HAVE_PCAP_FINDALLDEVS
1746 devnum = parse_interface_number(device);
1747 if (devnum == -1) {
1748 /*
1749 * It's not a number; just report
1750 * the open error and fail.
1751 */
1752 error("%s", ebuf);
1753 }
1754
1755 /*
1756 * OK, it's a number; try to find the
1757 * interface with that index, and try
1758 * to open it.
1759 *
1760 * find_interface_by_number() exits if it
1761 * couldn't be found.
1762 */
1763 device = find_interface_by_number(devnum);
1764 pd = open_interface(device, ndo, ebuf);
1765 if (pd == NULL)
1766 error("%s", ebuf);
1767 #else /* HAVE_PCAP_FINDALLDEVS */
1768 /*
1769 * We can't get a list of interfaces; just
1770 * fail.
1771 */
1772 error("%s", ebuf);
1773 #endif /* HAVE_PCAP_FINDALLDEVS */
1774 }
1775
1776 /*
1777 * Let user own process after socket has been opened.
1778 */
1779 #ifndef _WIN32
1780 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1781 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1782 #endif /* _WIN32 */
1783 #if !defined(HAVE_PCAP_CREATE) && defined(_WIN32)
1784 if(Bflag != 0)
1785 if(pcap_setbuff(pd, Bflag)==-1){
1786 error("%s", pcap_geterr(pd));
1787 }
1788 #endif /* !defined(HAVE_PCAP_CREATE) && defined(_WIN32) */
1789 if (Lflag)
1790 show_dlts_and_exit(pd, device);
1791 if (yflag_dlt >= 0) {
1792 #ifdef HAVE_PCAP_SET_DATALINK
1793 if (pcap_set_datalink(pd, yflag_dlt) < 0)
1794 error("%s", pcap_geterr(pd));
1795 #else
1796 /*
1797 * We don't actually support changing the
1798 * data link type, so we only let them
1799 * set it to what it already is.
1800 */
1801 if (yflag_dlt != pcap_datalink(pd)) {
1802 error("%s is not one of the DLTs supported by this device\n",
1803 yflag_dlt_name);
1804 }
1805 #endif
1806 (void)fprintf(stderr, "%s: data link type %s\n",
1807 program_name, yflag_dlt_name);
1808 (void)fflush(stderr);
1809 }
1810 i = pcap_snapshot(pd);
1811 if (ndo->ndo_snaplen < i) {
1812 warning("snaplen raised from %d to %d", ndo->ndo_snaplen, i);
1813 ndo->ndo_snaplen = i;
1814 }
1815 if(ndo->ndo_fflag != 0) {
1816 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1817 warning("foreign (-f) flag used but: %s", ebuf);
1818 }
1819 }
1820
1821 }
1822 if (infile)
1823 cmdbuf = read_infile(infile);
1824 else
1825 cmdbuf = copy_argv(&argv[optind]);
1826
1827 #ifdef HAVE_PCAP_SET_OPTIMIZER_DEBUG
1828 pcap_set_optimizer_debug(dflag);
1829 #endif
1830 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1831 error("%s", pcap_geterr(pd));
1832 if (dflag) {
1833 bpf_dump(&fcode, dflag);
1834 pcap_close(pd);
1835 free(cmdbuf);
1836 pcap_freecode(&fcode);
1837 exit_tcpdump(0);
1838 }
1839
1840 #ifdef HAVE_CASPER
1841 if (!ndo->ndo_nflag)
1842 capdns = capdns_setup();
1843 #endif /* HAVE_CASPER */
1844
1845 init_print(ndo, localnet, netmask, timezone_offset);
1846
1847 #ifndef _WIN32
1848 (void)setsignal(SIGPIPE, cleanup);
1849 (void)setsignal(SIGTERM, cleanup);
1850 (void)setsignal(SIGINT, cleanup);
1851 #endif /* _WIN32 */
1852 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1853 (void)setsignal(SIGCHLD, child_cleanup);
1854 #endif
1855 /* Cooperate with nohup(1) */
1856 #ifndef _WIN32
1857 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1858 (void)setsignal(SIGHUP, oldhandler);
1859 #endif /* _WIN32 */
1860
1861 #ifndef _WIN32
1862 /*
1863 * If a user name was specified with "-Z", attempt to switch to
1864 * that user's UID. This would probably be used with sudo,
1865 * to allow tcpdump to be run in a special restricted
1866 * account (if you just want to allow users to open capture
1867 * devices, and can't just give users that permission,
1868 * you'd make tcpdump set-UID or set-GID).
1869 *
1870 * Tcpdump doesn't necessarily write only to one savefile;
1871 * the general only way to allow a -Z instance to write to
1872 * savefiles as the user under whose UID it's run, rather
1873 * than as the user specified with -Z, would thus be to switch
1874 * to the original user ID before opening a capture file and
1875 * then switch back to the -Z user ID after opening the savefile.
1876 * Switching to the -Z user ID only after opening the first
1877 * savefile doesn't handle the general case.
1878 */
1879
1880 if (getuid() == 0 || geteuid() == 0) {
1881 #ifdef HAVE_LIBCAP_NG
1882 /* Initialize capng */
1883 capng_clear(CAPNG_SELECT_BOTH);
1884 if (username) {
1885 capng_updatev(
1886 CAPNG_ADD,
1887 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1888 CAP_SETUID,
1889 CAP_SETGID,
1890 -1);
1891 }
1892 if (chroot_dir) {
1893 capng_update(
1894 CAPNG_ADD,
1895 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1896 CAP_SYS_CHROOT
1897 );
1898 }
1899
1900 if (WFileName) {
1901 capng_update(
1902 CAPNG_ADD,
1903 CAPNG_PERMITTED | CAPNG_EFFECTIVE,
1904 CAP_DAC_OVERRIDE
1905 );
1906 }
1907 capng_apply(CAPNG_SELECT_BOTH);
1908 #endif /* HAVE_LIBCAP_NG */
1909 if (username || chroot_dir)
1910 droproot(username, chroot_dir);
1911
1912 }
1913 #endif /* _WIN32 */
1914
1915 if (pcap_setfilter(pd, &fcode) < 0)
1916 error("%s", pcap_geterr(pd));
1917 #ifdef HAVE_CAPSICUM
1918 if (RFileName == NULL && VFileName == NULL && pcap_fileno(pd) != -1) {
1919 static const unsigned long cmds[] = { BIOCGSTATS, BIOCROTZBUF };
1920
1921 /*
1922 * The various libpcap devices use a combination of
1923 * read (bpf), ioctl (bpf, netmap), poll (netmap)
1924 * so we add the relevant access rights.
1925 */
1926 cap_rights_init(&rights, CAP_IOCTL, CAP_READ, CAP_EVENT);
1927 if (cap_rights_limit(pcap_fileno(pd), &rights) < 0 &&
1928 errno != ENOSYS) {
1929 error("unable to limit pcap descriptor");
1930 }
1931 if (cap_ioctls_limit(pcap_fileno(pd), cmds,
1932 sizeof(cmds) / sizeof(cmds[0])) < 0 && errno != ENOSYS) {
1933 error("unable to limit ioctls on pcap descriptor");
1934 }
1935 }
1936 #endif
1937 if (WFileName) {
1938 pcap_dumper_t *p;
1939 /* Do not exceed the default PATH_MAX for files. */
1940 dumpinfo.CurrentFileName = (char *)malloc(PATH_MAX + 1);
1941
1942 if (dumpinfo.CurrentFileName == NULL)
1943 error("malloc of dumpinfo.CurrentFileName");
1944
1945 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1946 if (Cflag != 0)
1947 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1948 else
1949 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1950
1951 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1952 #ifdef HAVE_LIBCAP_NG
1953 /* Give up CAP_DAC_OVERRIDE capability.
1954 * Only allow it to be restored if the -C or -G flag have been
1955 * set since we may need to create more files later on.
1956 */
1957 capng_update(
1958 CAPNG_DROP,
1959 (Cflag || Gflag ? 0 : CAPNG_PERMITTED)
1960 | CAPNG_EFFECTIVE,
1961 CAP_DAC_OVERRIDE
1962 );
1963 capng_apply(CAPNG_SELECT_BOTH);
1964 #endif /* HAVE_LIBCAP_NG */
1965 if (p == NULL)
1966 error("%s", pcap_geterr(pd));
1967 #ifdef HAVE_CAPSICUM
1968 set_dumper_capsicum_rights(p);
1969 #endif
1970 if (Cflag != 0 || Gflag != 0) {
1971 #ifdef HAVE_CAPSICUM
1972 dumpinfo.WFileName = strdup(basename(WFileName));
1973 if (dumpinfo.WFileName == NULL) {
1974 error("Unable to allocate memory for file %s",
1975 WFileName);
1976 }
1977 dumpinfo.dirfd = open(dirname(WFileName),
1978 O_DIRECTORY | O_RDONLY);
1979 if (dumpinfo.dirfd < 0) {
1980 error("unable to open directory %s",
1981 dirname(WFileName));
1982 }
1983 cap_rights_init(&rights, CAP_CREATE, CAP_FCNTL,
1984 CAP_FTRUNCATE, CAP_LOOKUP, CAP_SEEK, CAP_WRITE);
1985 if (cap_rights_limit(dumpinfo.dirfd, &rights) < 0 &&
1986 errno != ENOSYS) {
1987 error("unable to limit directory rights");
1988 }
1989 if (cap_fcntls_limit(dumpinfo.dirfd, CAP_FCNTL_GETFL) < 0 &&
1990 errno != ENOSYS) {
1991 error("unable to limit dump descriptor fcntls");
1992 }
1993 #else /* !HAVE_CAPSICUM */
1994 dumpinfo.WFileName = WFileName;
1995 #endif
1996 callback = dump_packet_and_trunc;
1997 dumpinfo.pd = pd;
1998 dumpinfo.p = p;
1999 pcap_userdata = (u_char *)&dumpinfo;
2000 } else {
2001 callback = dump_packet;
2002 pcap_userdata = (u_char *)p;
2003 }
2004 #ifdef HAVE_PCAP_DUMP_FLUSH
2005 if (Uflag)
2006 pcap_dump_flush(p);
2007 #endif
2008 } else {
2009 dlt = pcap_datalink(pd);
2010 ndo->ndo_if_printer = get_if_printer(ndo, dlt);
2011 callback = print_packet;
2012 pcap_userdata = (u_char *)ndo;
2013 }
2014
2015 #ifdef SIGNAL_REQ_INFO
2016 /*
2017 * We can't get statistics when reading from a file rather
2018 * than capturing from a device.
2019 */
2020 if (RFileName == NULL)
2021 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
2022 #endif
2023
2024 if (ndo->ndo_vflag > 0 && WFileName) {
2025 /*
2026 * When capturing to a file, "-v" means tcpdump should,
2027 * every 10 seconds, "v"erbosely report the number of
2028 * packets captured.
2029 */
2030 #ifdef USE_WIN32_MM_TIMER
2031 /* call verbose_stats_dump() each 1000 +/-100msec */
2032 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
2033 setvbuf(stderr, NULL, _IONBF, 0);
2034 #elif defined(HAVE_ALARM)
2035 (void)setsignal(SIGALRM, verbose_stats_dump);
2036 alarm(1);
2037 #endif
2038 }
2039
2040 if (RFileName == NULL) {
2041 /*
2042 * Live capture (if -V was specified, we set RFileName
2043 * to a file from the -V file). Print a message to
2044 * the standard error on UN*X.
2045 */
2046 if (!ndo->ndo_vflag && !WFileName) {
2047 (void)fprintf(stderr,
2048 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
2049 program_name);
2050 } else
2051 (void)fprintf(stderr, "%s: ", program_name);
2052 dlt = pcap_datalink(pd);
2053 dlt_name = pcap_datalink_val_to_name(dlt);
2054 if (dlt_name == NULL) {
2055 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
2056 device, dlt, ndo->ndo_snaplen);
2057 } else {
2058 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
2059 device, dlt_name,
2060 pcap_datalink_val_to_description(dlt), ndo->ndo_snaplen);
2061 }
2062 (void)fflush(stderr);
2063 }
2064
2065 #ifdef HAVE_CAPSICUM
2066 cansandbox = (VFileName == NULL && zflag == NULL &&
2067 ndo->ndo_espsecret == NULL);
2068 #ifdef HAVE_CASPER
2069 cansandbox = (cansandbox && (ndo->ndo_nflag || capdns != NULL));
2070 #else
2071 cansandbox = (cansandbox && ndo->ndo_nflag);
2072 #endif /* HAVE_CASPER */
2073 cansandbox = (cansandbox && (pcap_fileno(pd) != -1 ||
2074 RFileName != NULL));
2075
2076 if (cansandbox && cap_enter() < 0 && errno != ENOSYS)
2077 error("unable to enter the capability mode");
2078 #endif /* HAVE_CAPSICUM */
2079
2080 do {
2081 status = pcap_loop(pd, cnt, callback, pcap_userdata);
2082 if (WFileName == NULL) {
2083 /*
2084 * We're printing packets. Flush the printed output,
2085 * so it doesn't get intermingled with error output.
2086 */
2087 if (status == -2) {
2088 /*
2089 * We got interrupted, so perhaps we didn't
2090 * manage to finish a line we were printing.
2091 * Print an extra newline, just in case.
2092 */
2093 putchar('\n');
2094 }
2095 (void)fflush(stdout);
2096 }
2097 if (status == -2) {
2098 /*
2099 * We got interrupted. If we are reading multiple
2100 * files (via -V) set these so that we stop.
2101 */
2102 VFileName = NULL;
2103 ret = NULL;
2104 }
2105 if (status == -1) {
2106 /*
2107 * Error. Report it.
2108 */
2109 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
2110 program_name, pcap_geterr(pd));
2111 }
2112 if (RFileName == NULL) {
2113 /*
2114 * We're doing a live capture. Report the capture
2115 * statistics.
2116 */
2117 info(1);
2118 }
2119 pcap_close(pd);
2120 if (VFileName != NULL) {
2121 ret = get_next_file(VFile, VFileLine);
2122 if (ret) {
2123 int new_dlt;
2124
2125 RFileName = VFileLine;
2126 pd = pcap_open_offline(RFileName, ebuf);
2127 if (pd == NULL)
2128 error("%s", ebuf);
2129 #ifdef HAVE_CAPSICUM
2130 cap_rights_init(&rights, CAP_READ);
2131 if (cap_rights_limit(fileno(pcap_file(pd)),
2132 &rights) < 0 && errno != ENOSYS) {
2133 error("unable to limit pcap descriptor");
2134 }
2135 #endif
2136 new_dlt = pcap_datalink(pd);
2137 if (new_dlt != dlt) {
2138 /*
2139 * The new file has a different
2140 * link-layer header type from the
2141 * previous one.
2142 */
2143 if (WFileName != NULL) {
2144 /*
2145 * We're writing raw packets
2146 * that match the filter to
2147 * a pcap file. pcap files
2148 * don't support multiple
2149 * different link-layer
2150 * header types, so we fail
2151 * here.
2152 */
2153 error("%s: new dlt does not match original", RFileName);
2154 }
2155
2156 /*
2157 * We're printing the decoded packets;
2158 * switch to the new DLT.
2159 *
2160 * To do that, we need to change
2161 * the printer, change the DLT name,
2162 * and recompile the filter with
2163 * the new DLT.
2164 */
2165 dlt = new_dlt;
2166 ndo->ndo_if_printer = get_if_printer(ndo, dlt);
2167 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
2168 error("%s", pcap_geterr(pd));
2169 }
2170
2171 /*
2172 * Set the filter on the new file.
2173 */
2174 if (pcap_setfilter(pd, &fcode) < 0)
2175 error("%s", pcap_geterr(pd));
2176
2177 /*
2178 * Report the new file.
2179 */
2180 dlt_name = pcap_datalink_val_to_name(dlt);
2181 if (dlt_name == NULL) {
2182 fprintf(stderr, "reading from file %s, link-type %u\n",
2183 RFileName, dlt);
2184 } else {
2185 fprintf(stderr,
2186 "reading from file %s, link-type %s (%s)\n",
2187 RFileName, dlt_name,
2188 pcap_datalink_val_to_description(dlt));
2189 }
2190 }
2191 }
2192 }
2193 while (ret != NULL);
2194
2195 free(cmdbuf);
2196 pcap_freecode(&fcode);
2197 exit_tcpdump(status == -1 ? 1 : 0);
2198 }
2199
2200 /* make a clean exit on interrupts */
2201 static RETSIGTYPE
cleanup(int signo _U_)2202 cleanup(int signo _U_)
2203 {
2204 #ifdef USE_WIN32_MM_TIMER
2205 if (timer_id)
2206 timeKillEvent(timer_id);
2207 timer_id = 0;
2208 #elif defined(HAVE_ALARM)
2209 alarm(0);
2210 #endif
2211
2212 #ifdef HAVE_PCAP_BREAKLOOP
2213 /*
2214 * We have "pcap_breakloop()"; use it, so that we do as little
2215 * as possible in the signal handler (it's probably not safe
2216 * to do anything with standard I/O streams in a signal handler -
2217 * the ANSI C standard doesn't say it is).
2218 */
2219 pcap_breakloop(pd);
2220 #else
2221 /*
2222 * We don't have "pcap_breakloop()"; this isn't safe, but
2223 * it's the best we can do. Print the summary if we're
2224 * not reading from a savefile - i.e., if we're doing a
2225 * live capture - and exit.
2226 */
2227 if (pd != NULL && pcap_file(pd) == NULL) {
2228 /*
2229 * We got interrupted, so perhaps we didn't
2230 * manage to finish a line we were printing.
2231 * Print an extra newline, just in case.
2232 */
2233 putchar('\n');
2234 (void)fflush(stdout);
2235 info(1);
2236 }
2237 exit_tcpdump(0);
2238 #endif
2239 }
2240
2241 /*
2242 On windows, we do not use a fork, so we do not care less about
2243 waiting a child processes to die
2244 */
2245 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2246 static RETSIGTYPE
child_cleanup(int signo _U_)2247 child_cleanup(int signo _U_)
2248 {
2249 wait(NULL);
2250 }
2251 #endif /* HAVE_FORK && HAVE_VFORK */
2252
2253 static void
info(register int verbose)2254 info(register int verbose)
2255 {
2256 struct pcap_stat stats;
2257
2258 /*
2259 * Older versions of libpcap didn't set ps_ifdrop on some
2260 * platforms; initialize it to 0 to handle that.
2261 */
2262 stats.ps_ifdrop = 0;
2263 if (pcap_stats(pd, &stats) < 0) {
2264 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
2265 infoprint = 0;
2266 return;
2267 }
2268
2269 if (!verbose)
2270 fprintf(stderr, "%s: ", program_name);
2271
2272 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
2273 PLURAL_SUFFIX(packets_captured));
2274 if (!verbose)
2275 fputs(", ", stderr);
2276 else
2277 putc('\n', stderr);
2278 (void)fprintf(stderr, "%u packet%s received by filter", stats.ps_recv,
2279 PLURAL_SUFFIX(stats.ps_recv));
2280 if (!verbose)
2281 fputs(", ", stderr);
2282 else
2283 putc('\n', stderr);
2284 (void)fprintf(stderr, "%u packet%s dropped by kernel", stats.ps_drop,
2285 PLURAL_SUFFIX(stats.ps_drop));
2286 if (stats.ps_ifdrop != 0) {
2287 if (!verbose)
2288 fputs(", ", stderr);
2289 else
2290 putc('\n', stderr);
2291 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
2292 stats.ps_ifdrop, PLURAL_SUFFIX(stats.ps_ifdrop));
2293 } else
2294 putc('\n', stderr);
2295 infoprint = 0;
2296 }
2297
2298 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
2299 #ifdef HAVE_FORK
2300 #define fork_subprocess() fork()
2301 #else
2302 #define fork_subprocess() vfork()
2303 #endif
2304 static void
compress_savefile(const char * filename)2305 compress_savefile(const char *filename)
2306 {
2307 pid_t child;
2308
2309 child = fork_subprocess();
2310 if (child == -1) {
2311 fprintf(stderr,
2312 "compress_savefile: fork failed: %s\n",
2313 pcap_strerror(errno));
2314 return;
2315 }
2316 if (child != 0) {
2317 /* Parent process. */
2318 return;
2319 }
2320
2321 /*
2322 * Child process.
2323 * Set to lowest priority so that this doesn't disturb the capture.
2324 */
2325 #ifdef NZERO
2326 setpriority(PRIO_PROCESS, 0, NZERO - 1);
2327 #else
2328 setpriority(PRIO_PROCESS, 0, 19);
2329 #endif
2330 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
2331 fprintf(stderr,
2332 "compress_savefile: execlp(%s, %s) failed: %s\n",
2333 zflag,
2334 filename,
2335 pcap_strerror(errno));
2336 #ifdef HAVE_FORK
2337 exit(1);
2338 #else
2339 _exit(1);
2340 #endif
2341 }
2342 #else /* HAVE_FORK && HAVE_VFORK */
2343 static void
compress_savefile(const char * filename)2344 compress_savefile(const char *filename)
2345 {
2346 fprintf(stderr,
2347 "compress_savefile failed. Functionality not implemented under your system\n");
2348 }
2349 #endif /* HAVE_FORK && HAVE_VFORK */
2350
2351 static void
dump_packet_and_trunc(u_char * user,const struct pcap_pkthdr * h,const u_char * sp)2352 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2353 {
2354 struct dump_info *dump_info;
2355
2356 ++packets_captured;
2357
2358 ++infodelay;
2359
2360 dump_info = (struct dump_info *)user;
2361
2362 /*
2363 * XXX - this won't force the file to rotate on the specified time
2364 * boundary, but it will rotate on the first packet received after the
2365 * specified Gflag number of seconds. Note: if a Gflag time boundary
2366 * and a Cflag size boundary coincide, the time rotation will occur
2367 * first thereby cancelling the Cflag boundary (since the file should
2368 * be 0).
2369 */
2370 if (Gflag != 0) {
2371 /* Check if it is time to rotate */
2372 time_t t;
2373
2374 /* Get the current time */
2375 if ((t = time(NULL)) == (time_t)-1) {
2376 error("dump_and_trunc_packet: can't get current_time: %s",
2377 pcap_strerror(errno));
2378 }
2379
2380
2381 /* If the time is greater than the specified window, rotate */
2382 if (t - Gflag_time >= Gflag) {
2383 #ifdef HAVE_CAPSICUM
2384 FILE *fp;
2385 int fd;
2386 #endif
2387
2388 /* Update the Gflag_time */
2389 Gflag_time = t;
2390 /* Update Gflag_count */
2391 Gflag_count++;
2392 /*
2393 * Close the current file and open a new one.
2394 */
2395 pcap_dump_close(dump_info->p);
2396
2397 /*
2398 * Compress the file we just closed, if the user asked for it
2399 */
2400 if (zflag != NULL)
2401 compress_savefile(dump_info->CurrentFileName);
2402
2403 /*
2404 * Check to see if we've exceeded the Wflag (when
2405 * not using Cflag).
2406 */
2407 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
2408 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
2409 Wflag);
2410 info(1);
2411 exit_tcpdump(0);
2412 /* NOTREACHED */
2413 }
2414 if (dump_info->CurrentFileName != NULL)
2415 free(dump_info->CurrentFileName);
2416 /* Allocate space for max filename + \0. */
2417 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2418 if (dump_info->CurrentFileName == NULL)
2419 error("dump_packet_and_trunc: malloc");
2420 /*
2421 * Gflag was set otherwise we wouldn't be here. Reset the count
2422 * so multiple files would end with 1,2,3 in the filename.
2423 * The counting is handled with the -C flow after this.
2424 */
2425 Cflag_count = 0;
2426
2427 /*
2428 * This is always the first file in the Cflag
2429 * rotation: e.g. 0
2430 * We also don't need numbering if Cflag is not set.
2431 */
2432 if (Cflag != 0)
2433 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
2434 WflagChars);
2435 else
2436 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
2437
2438 #ifdef HAVE_LIBCAP_NG
2439 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2440 capng_apply(CAPNG_SELECT_BOTH);
2441 #endif /* HAVE_LIBCAP_NG */
2442 #ifdef HAVE_CAPSICUM
2443 fd = openat(dump_info->dirfd,
2444 dump_info->CurrentFileName,
2445 O_CREAT | O_WRONLY | O_TRUNC, 0644);
2446 if (fd < 0) {
2447 error("unable to open file %s",
2448 dump_info->CurrentFileName);
2449 }
2450 fp = fdopen(fd, "w");
2451 if (fp == NULL) {
2452 error("unable to fdopen file %s",
2453 dump_info->CurrentFileName);
2454 }
2455 dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2456 #else /* !HAVE_CAPSICUM */
2457 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2458 #endif
2459 #ifdef HAVE_LIBCAP_NG
2460 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2461 capng_apply(CAPNG_SELECT_BOTH);
2462 #endif /* HAVE_LIBCAP_NG */
2463 if (dump_info->p == NULL)
2464 error("%s", pcap_geterr(pd));
2465 #ifdef HAVE_CAPSICUM
2466 set_dumper_capsicum_rights(dump_info->p);
2467 #endif
2468 }
2469 }
2470
2471 /*
2472 * XXX - this won't prevent capture files from getting
2473 * larger than Cflag - the last packet written to the
2474 * file could put it over Cflag.
2475 */
2476 if (Cflag != 0) {
2477 long size = pcap_dump_ftell(dump_info->p);
2478
2479 if (size == -1)
2480 error("ftell fails on output file");
2481 if (size > Cflag) {
2482 #ifdef HAVE_CAPSICUM
2483 FILE *fp;
2484 int fd;
2485 #endif
2486
2487 /*
2488 * Close the current file and open a new one.
2489 */
2490 pcap_dump_close(dump_info->p);
2491
2492 /*
2493 * Compress the file we just closed, if the user
2494 * asked for it.
2495 */
2496 if (zflag != NULL)
2497 compress_savefile(dump_info->CurrentFileName);
2498
2499 Cflag_count++;
2500 if (Wflag > 0) {
2501 if (Cflag_count >= Wflag)
2502 Cflag_count = 0;
2503 }
2504 if (dump_info->CurrentFileName != NULL)
2505 free(dump_info->CurrentFileName);
2506 dump_info->CurrentFileName = (char *)malloc(PATH_MAX + 1);
2507 if (dump_info->CurrentFileName == NULL)
2508 error("dump_packet_and_trunc: malloc");
2509 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
2510 #ifdef HAVE_LIBCAP_NG
2511 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2512 capng_apply(CAPNG_SELECT_BOTH);
2513 #endif /* HAVE_LIBCAP_NG */
2514 #ifdef HAVE_CAPSICUM
2515 fd = openat(dump_info->dirfd, dump_info->CurrentFileName,
2516 O_CREAT | O_WRONLY | O_TRUNC, 0644);
2517 if (fd < 0) {
2518 error("unable to open file %s",
2519 dump_info->CurrentFileName);
2520 }
2521 fp = fdopen(fd, "w");
2522 if (fp == NULL) {
2523 error("unable to fdopen file %s",
2524 dump_info->CurrentFileName);
2525 }
2526 dump_info->p = pcap_dump_fopen(dump_info->pd, fp);
2527 #else /* !HAVE_CAPSICUM */
2528 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
2529 #endif
2530 #ifdef HAVE_LIBCAP_NG
2531 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
2532 capng_apply(CAPNG_SELECT_BOTH);
2533 #endif /* HAVE_LIBCAP_NG */
2534 if (dump_info->p == NULL)
2535 error("%s", pcap_geterr(pd));
2536 #ifdef HAVE_CAPSICUM
2537 set_dumper_capsicum_rights(dump_info->p);
2538 #endif
2539 }
2540 }
2541
2542 pcap_dump((u_char *)dump_info->p, h, sp);
2543 #ifdef HAVE_PCAP_DUMP_FLUSH
2544 if (Uflag)
2545 pcap_dump_flush(dump_info->p);
2546 #endif
2547
2548 --infodelay;
2549 if (infoprint)
2550 info(0);
2551 }
2552
2553 static void
dump_packet(u_char * user,const struct pcap_pkthdr * h,const u_char * sp)2554 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2555 {
2556 ++packets_captured;
2557
2558 ++infodelay;
2559
2560 pcap_dump(user, h, sp);
2561 #ifdef HAVE_PCAP_DUMP_FLUSH
2562 if (Uflag)
2563 pcap_dump_flush((pcap_dumper_t *)user);
2564 #endif
2565
2566 --infodelay;
2567 if (infoprint)
2568 info(0);
2569 }
2570
2571 static void
print_packet(u_char * user,const struct pcap_pkthdr * h,const u_char * sp)2572 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
2573 {
2574 ++packets_captured;
2575
2576 ++infodelay;
2577
2578 pretty_print_packet((netdissect_options *)user, h, sp, packets_captured);
2579
2580 --infodelay;
2581 if (infoprint)
2582 info(0);
2583 }
2584
2585 #ifdef _WIN32
2586 /*
2587 * XXX - there should really be libpcap calls to get the version
2588 * number as a string (the string would be generated from #defines
2589 * at run time, so that it's not generated from string constants
2590 * in the library, as, on many UNIX systems, those constants would
2591 * be statically linked into the application executable image, and
2592 * would thus reflect the version of libpcap on the system on
2593 * which the application was *linked*, not the system on which it's
2594 * *running*.
2595 *
2596 * That routine should be documented, unlike the "version[]"
2597 * string, so that UNIX vendors providing their own libpcaps
2598 * don't omit it (as a couple of vendors have...).
2599 *
2600 * Packet.dll should perhaps also export a routine to return the
2601 * version number of the Packet.dll code, to supply the
2602 * "Wpcap_version" information on Windows.
2603 */
2604 char WDversion[]="current-git.tcpdump.org";
2605 #if !defined(HAVE_GENERATED_VERSION)
2606 char version[]="current-git.tcpdump.org";
2607 #endif
2608 char pcap_version[]="current-git.tcpdump.org";
2609 char Wpcap_version[]="3.1";
2610 #endif
2611
2612 #ifdef SIGNAL_REQ_INFO
requestinfo(int signo _U_)2613 RETSIGTYPE requestinfo(int signo _U_)
2614 {
2615 if (infodelay)
2616 ++infoprint;
2617 else
2618 info(0);
2619 }
2620 #endif
2621
2622 /*
2623 * Called once each second in verbose mode while dumping to file
2624 */
2625 #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_)2626 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2627 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2628 {
2629 if (infodelay == 0)
2630 fprintf(stderr, "Got %u\r", packets_captured);
2631 }
2632 #elif defined(HAVE_ALARM)
verbose_stats_dump(int sig _U_)2633 static void verbose_stats_dump(int sig _U_)
2634 {
2635 if (infodelay == 0)
2636 fprintf(stderr, "Got %u\r", packets_captured);
2637 alarm(1);
2638 }
2639 #endif
2640
2641 USES_APPLE_DEPRECATED_API
2642 static void
print_version(void)2643 print_version(void)
2644 {
2645 extern char version[];
2646 #ifndef HAVE_PCAP_LIB_VERSION
2647 #if defined(_WIN32) || defined(HAVE_PCAP_VERSION)
2648 extern char pcap_version[];
2649 #else /* defined(_WIN32) || defined(HAVE_PCAP_VERSION) */
2650 static char pcap_version[] = "unknown";
2651 #endif /* defined(_WIN32) || defined(HAVE_PCAP_VERSION) */
2652 #endif /* HAVE_PCAP_LIB_VERSION */
2653 const char *smi_version_string;
2654
2655 #ifdef HAVE_PCAP_LIB_VERSION
2656 #ifdef _WIN32
2657 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2658 #else /* _WIN32 */
2659 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2660 #endif /* _WIN32 */
2661 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2662 #else /* HAVE_PCAP_LIB_VERSION */
2663 #ifdef _WIN32
2664 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2665 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2666 #else /* _WIN32 */
2667 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2668 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2669 #endif /* _WIN32 */
2670 #endif /* HAVE_PCAP_LIB_VERSION */
2671
2672 #if defined(HAVE_LIBCRYPTO) && defined(SSLEAY_VERSION)
2673 (void)fprintf (stderr, "%s\n", SSLeay_version(SSLEAY_VERSION));
2674 #endif
2675
2676 smi_version_string = nd_smi_version_string();
2677 if (smi_version_string != NULL)
2678 (void)fprintf (stderr, "SMI-library: %s\n", smi_version_string);
2679
2680 #if defined(__SANITIZE_ADDRESS__)
2681 (void)fprintf (stderr, "Compiled with AddressSanitizer/GCC.\n");
2682 #elif defined(__has_feature)
2683 # if __has_feature(address_sanitizer)
2684 (void)fprintf (stderr, "Compiled with AddressSanitizer/CLang.\n");
2685 # endif
2686 #endif /* __SANITIZE_ADDRESS__ or __has_feature */
2687 }
2688 USES_APPLE_RST
2689
2690 static void
print_usage(void)2691 print_usage(void)
2692 {
2693 print_version();
2694 (void)fprintf(stderr,
2695 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqStu" U_FLAG "vxX#]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2696 (void)fprintf(stderr,
2697 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2698 (void)fprintf(stderr,
2699 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ] [ --number ]\n");
2700 #ifdef HAVE_PCAP_SETDIRECTION
2701 (void)fprintf(stderr,
2702 "\t\t[ -Q in|out|inout ]\n");
2703 #endif
2704 (void)fprintf(stderr,
2705 "\t\t[ -r file ] [ -s snaplen ] ");
2706 #ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
2707 (void)fprintf(stderr, "[ --time-stamp-precision precision ]\n");
2708 (void)fprintf(stderr,
2709 "\t\t");
2710 #endif
2711 #ifdef HAVE_PCAP_SET_IMMEDIATE_MODE
2712 (void)fprintf(stderr, "[ --immediate-mode ] ");
2713 #endif
2714 (void)fprintf(stderr, "[ -T type ] [ --version ] [ -V file ]\n");
2715 (void)fprintf(stderr,
2716 "\t\t[ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z postrotate-command ]\n");
2717 (void)fprintf(stderr,
2718 "\t\t[ -Z user ] [ expression ]\n");
2719 }
2720 /*
2721 * Local Variables:
2722 * c-style: whitesmith
2723 * c-basic-offset: 8
2724 * End:
2725 */
2726