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[tcpdump] / tcpdump.c
1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Support for splitting captures into multiple files with a maximum
22 * file size:
23 *
24 * Copyright (c) 2001
25 * Seth Webster <swebster@sst.ll.mit.edu>
26 */
27
28 #ifndef lint
29 static const char copyright[] _U_ =
30 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
31 The Regents of the University of California. All rights reserved.\n";
32 static const char rcsid[] _U_ =
33 "@(#) $Header: /tcpdump/master/tcpdump/tcpdump.c,v 1.283 2008-09-25 21:45:50 guy Exp $ (LBL)";
34 #endif
35
36 /*
37 * tcpdump - monitor tcp/ip traffic on an ethernet.
38 *
39 * First written in 1987 by Van Jacobson, Lawrence Berkeley Laboratory.
40 * Mercilessly hacked and occasionally improved since then via the
41 * combined efforts of Van, Steve McCanne and Craig Leres of LBL.
42 */
43
44 #ifdef HAVE_CONFIG_H
45 #include "config.h"
46 #endif
47
48 #include <tcpdump-stdinc.h>
49
50 #ifdef WIN32
51 #include "getopt.h"
52 #include "w32_fzs.h"
53 extern int strcasecmp (const char *__s1, const char *__s2);
54 extern int SIZE_BUF;
55 #define off_t long
56 #define uint UINT
57 #endif /* WIN32 */
58
59 #ifdef HAVE_SMI_H
60 #include <smi.h>
61 #endif
62
63 #include <pcap.h>
64 #include <signal.h>
65 #include <stdio.h>
66 #include <stdlib.h>
67 #include <string.h>
68 #include <limits.h>
69 #ifndef WIN32
70 #include <sys/wait.h>
71 #include <sys/resource.h>
72 #include <pwd.h>
73 #include <grp.h>
74 #include <errno.h>
75 #endif /* WIN32 */
76
77 /* capabilities convinience library */
78 #ifdef HAVE_CAP_NG_H
79 #include <cap-ng.h>
80 #endif /* HAVE_CAP_NG_H */
81
82 #include "netdissect.h"
83 #include "interface.h"
84 #include "addrtoname.h"
85 #include "machdep.h"
86 #include "setsignal.h"
87 #include "gmt2local.h"
88 #include "pcap-missing.h"
89
90 #ifndef NAME_MAX
91 #define NAME_MAX 255
92 #endif
93
94 #ifdef SIGINFO
95 #define SIGNAL_REQ_INFO SIGINFO
96 #elif SIGUSR1
97 #define SIGNAL_REQ_INFO SIGUSR1
98 #endif
99
100 netdissect_options Gndo;
101 netdissect_options *gndo = &Gndo;
102
103 static int dflag; /* print filter code */
104 static int Lflag; /* list available data link types and exit */
105 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
106 static int Jflag; /* list available time stamp types */
107 #endif
108 static char *zflag = NULL; /* compress each savefile using a specified command (like gzip or bzip2) */
109
110 static int infodelay;
111 static int infoprint;
112
113 char *program_name;
114
115 int32_t thiszone; /* seconds offset from gmt to local time */
116
117 /* Forwards */
118 static RETSIGTYPE cleanup(int);
119 static RETSIGTYPE child_cleanup(int);
120 static void usage(void) __attribute__((noreturn));
121 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
122
123 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
124 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
125 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
126 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
127 static void droproot(const char *, const char *);
128 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
129 __attribute__ ((noreturn, format (printf, 2, 3)));
130 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
131
132 #ifdef SIGNAL_REQ_INFO
133 RETSIGTYPE requestinfo(int);
134 #endif
135
136 #if defined(USE_WIN32_MM_TIMER)
137 #include <MMsystem.h>
138 static UINT timer_id;
139 static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
140 #elif defined(HAVE_ALARM)
141 static void verbose_stats_dump(int sig);
142 #endif
143
144 static void info(int);
145 static u_int packets_captured;
146
147 struct printer {
148 if_printer f;
149 int type;
150 };
151
152
153 struct ndo_printer {
154 if_ndo_printer f;
155 int type;
156 };
157
158
159 static struct printer printers[] = {
160 { arcnet_if_print, DLT_ARCNET },
161 #ifdef DLT_ARCNET_LINUX
162 { arcnet_linux_if_print, DLT_ARCNET_LINUX },
163 #endif
164 { token_if_print, DLT_IEEE802 },
165 #ifdef DLT_LANE8023
166 { lane_if_print, DLT_LANE8023 },
167 #endif
168 #ifdef DLT_CIP
169 { cip_if_print, DLT_CIP },
170 #endif
171 #ifdef DLT_ATM_CLIP
172 { cip_if_print, DLT_ATM_CLIP },
173 #endif
174 { sl_if_print, DLT_SLIP },
175 #ifdef DLT_SLIP_BSDOS
176 { sl_bsdos_if_print, DLT_SLIP_BSDOS },
177 #endif
178 { ppp_if_print, DLT_PPP },
179 #ifdef DLT_PPP_WITHDIRECTION
180 { ppp_if_print, DLT_PPP_WITHDIRECTION },
181 #endif
182 #ifdef DLT_PPP_BSDOS
183 { ppp_bsdos_if_print, DLT_PPP_BSDOS },
184 #endif
185 { fddi_if_print, DLT_FDDI },
186 { null_if_print, DLT_NULL },
187 #ifdef DLT_LOOP
188 { null_if_print, DLT_LOOP },
189 #endif
190 { raw_if_print, DLT_RAW },
191 { atm_if_print, DLT_ATM_RFC1483 },
192 #ifdef DLT_C_HDLC
193 { chdlc_if_print, DLT_C_HDLC },
194 #endif
195 #ifdef DLT_HDLC
196 { chdlc_if_print, DLT_HDLC },
197 #endif
198 #ifdef DLT_PPP_SERIAL
199 { ppp_hdlc_if_print, DLT_PPP_SERIAL },
200 #endif
201 #ifdef DLT_PPP_ETHER
202 { pppoe_if_print, DLT_PPP_ETHER },
203 #endif
204 #ifdef DLT_LINUX_SLL
205 { sll_if_print, DLT_LINUX_SLL },
206 #endif
207 #ifdef DLT_IEEE802_11
208 { ieee802_11_if_print, DLT_IEEE802_11},
209 #endif
210 #ifdef DLT_LTALK
211 { ltalk_if_print, DLT_LTALK },
212 #endif
213 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
214 { pflog_if_print, DLT_PFLOG },
215 #endif
216 #ifdef DLT_FR
217 { fr_if_print, DLT_FR },
218 #endif
219 #ifdef DLT_FRELAY
220 { fr_if_print, DLT_FRELAY },
221 #endif
222 #ifdef DLT_SUNATM
223 { sunatm_if_print, DLT_SUNATM },
224 #endif
225 #ifdef DLT_IP_OVER_FC
226 { ipfc_if_print, DLT_IP_OVER_FC },
227 #endif
228 #ifdef DLT_PRISM_HEADER
229 { prism_if_print, DLT_PRISM_HEADER },
230 #endif
231 #ifdef DLT_IEEE802_11_RADIO
232 { ieee802_11_radio_if_print, DLT_IEEE802_11_RADIO },
233 #endif
234 #ifdef DLT_ENC
235 { enc_if_print, DLT_ENC },
236 #endif
237 #ifdef DLT_SYMANTEC_FIREWALL
238 { symantec_if_print, DLT_SYMANTEC_FIREWALL },
239 #endif
240 #ifdef DLT_APPLE_IP_OVER_IEEE1394
241 { ap1394_if_print, DLT_APPLE_IP_OVER_IEEE1394 },
242 #endif
243 #ifdef DLT_IEEE802_11_RADIO_AVS
244 { ieee802_11_radio_avs_if_print, DLT_IEEE802_11_RADIO_AVS },
245 #endif
246 #ifdef DLT_JUNIPER_ATM1
247 { juniper_atm1_print, DLT_JUNIPER_ATM1 },
248 #endif
249 #ifdef DLT_JUNIPER_ATM2
250 { juniper_atm2_print, DLT_JUNIPER_ATM2 },
251 #endif
252 #ifdef DLT_JUNIPER_MFR
253 { juniper_mfr_print, DLT_JUNIPER_MFR },
254 #endif
255 #ifdef DLT_JUNIPER_MLFR
256 { juniper_mlfr_print, DLT_JUNIPER_MLFR },
257 #endif
258 #ifdef DLT_JUNIPER_MLPPP
259 { juniper_mlppp_print, DLT_JUNIPER_MLPPP },
260 #endif
261 #ifdef DLT_JUNIPER_PPPOE
262 { juniper_pppoe_print, DLT_JUNIPER_PPPOE },
263 #endif
264 #ifdef DLT_JUNIPER_PPPOE_ATM
265 { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
266 #endif
267 #ifdef DLT_JUNIPER_GGSN
268 { juniper_ggsn_print, DLT_JUNIPER_GGSN },
269 #endif
270 #ifdef DLT_JUNIPER_ES
271 { juniper_es_print, DLT_JUNIPER_ES },
272 #endif
273 #ifdef DLT_JUNIPER_MONITOR
274 { juniper_monitor_print, DLT_JUNIPER_MONITOR },
275 #endif
276 #ifdef DLT_JUNIPER_SERVICES
277 { juniper_services_print, DLT_JUNIPER_SERVICES },
278 #endif
279 #ifdef DLT_JUNIPER_ETHER
280 { juniper_ether_print, DLT_JUNIPER_ETHER },
281 #endif
282 #ifdef DLT_JUNIPER_PPP
283 { juniper_ppp_print, DLT_JUNIPER_PPP },
284 #endif
285 #ifdef DLT_JUNIPER_FRELAY
286 { juniper_frelay_print, DLT_JUNIPER_FRELAY },
287 #endif
288 #ifdef DLT_JUNIPER_CHDLC
289 { juniper_chdlc_print, DLT_JUNIPER_CHDLC },
290 #endif
291 #ifdef DLT_MFR
292 { mfr_if_print, DLT_MFR },
293 #endif
294 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
295 { bt_if_print, DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
296 #endif
297 #ifdef HAVE_PCAP_USB_H
298 #ifdef DLT_USB_LINUX
299 { usb_linux_48_byte_print, DLT_USB_LINUX},
300 #endif /* DLT_USB_LINUX */
301 #ifdef DLT_USB_LINUX_MMAPPED
302 { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
303 #endif /* DLT_USB_LINUX_MMAPPED */
304 #endif /* HAVE_PCAP_USB_H */
305 #ifdef DLT_IPV4
306 { raw_if_print, DLT_IPV4 },
307 #endif
308 #ifdef DLT_IPV6
309 { raw_if_print, DLT_IPV6 },
310 #endif
311 { NULL, 0 },
312 };
313
314 static struct ndo_printer ndo_printers[] = {
315 { ether_if_print, DLT_EN10MB },
316 #ifdef DLT_IPNET
317 { ipnet_if_print, DLT_IPNET },
318 #endif
319 #ifdef DLT_IEEE802_15_4
320 { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
321 #endif
322 #ifdef DLT_IEEE802_15_4_NOFCS
323 { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
324 #endif
325 #ifdef DLT_PPI
326 { ppi_if_print, DLT_PPI },
327 #endif
328 #ifdef DLT_NETANALYZER
329 { netanalyzer_if_print, DLT_NETANALYZER },
330 #endif
331 #ifdef DLT_NETANALYZER_TRANSPARENT
332 { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
333 #endif
334 { NULL, 0 },
335 };
336
337 if_printer
338 lookup_printer(int type)
339 {
340 struct printer *p;
341
342 for (p = printers; p->f; ++p)
343 if (type == p->type)
344 return p->f;
345
346 return NULL;
347 /* NOTREACHED */
348 }
349
350 if_ndo_printer
351 lookup_ndo_printer(int type)
352 {
353 struct ndo_printer *p;
354
355 for (p = ndo_printers; p->f; ++p)
356 if (type == p->type)
357 return p->f;
358
359 return NULL;
360 /* NOTREACHED */
361 }
362
363 static pcap_t *pd;
364
365 static int supports_monitor_mode;
366
367 extern int optind;
368 extern int opterr;
369 extern char *optarg;
370
371 struct print_info {
372 netdissect_options *ndo;
373 union {
374 if_printer printer;
375 if_ndo_printer ndo_printer;
376 } p;
377 int ndo_type;
378 };
379
380 struct dump_info {
381 char *WFileName;
382 char *CurrentFileName;
383 pcap_t *pd;
384 pcap_dumper_t *p;
385 };
386
387 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
388 static void
389 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
390 {
391 int n_tstamp_types;
392 int *tstamp_types = 0;
393 const char *tstamp_type_name;
394 int i;
395
396 n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
397 if (n_tstamp_types < 0)
398 error("%s", pcap_geterr(pd));
399
400 if (n_tstamp_types == 0) {
401 fprintf(stderr, "Time stamp type cannot be set for %s\n",
402 device);
403 exit(0);
404 }
405 fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
406 device);
407 for (i = 0; i < n_tstamp_types; i++) {
408 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
409 if (tstamp_type_name != NULL) {
410 (void) fprintf(stderr, " %s (%s)\n", tstamp_type_name,
411 pcap_tstamp_type_val_to_description(tstamp_types[i]));
412 } else {
413 (void) fprintf(stderr, " %d\n", tstamp_types[i]);
414 }
415 }
416 pcap_free_tstamp_types(tstamp_types);
417 exit(0);
418 }
419 #endif
420
421 static void
422 show_dlts_and_exit(const char *device, pcap_t *pd)
423 {
424 int n_dlts;
425 int *dlts = 0;
426 const char *dlt_name;
427
428 n_dlts = pcap_list_datalinks(pd, &dlts);
429 if (n_dlts < 0)
430 error("%s", pcap_geterr(pd));
431 else if (n_dlts == 0 || !dlts)
432 error("No data link types.");
433
434 /*
435 * If the interface is known to support monitor mode, indicate
436 * whether these are the data link types available when not in
437 * monitor mode, if -I wasn't specified, or when in monitor mode,
438 * when -I was specified (the link-layer types available in
439 * monitor mode might be different from the ones available when
440 * not in monitor mode).
441 */
442 if (supports_monitor_mode)
443 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
444 device,
445 Iflag ? "when in monitor mode" : "when not in monitor mode");
446 else
447 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
448 device);
449
450 while (--n_dlts >= 0) {
451 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
452 if (dlt_name != NULL) {
453 (void) fprintf(stderr, " %s (%s)", dlt_name,
454 pcap_datalink_val_to_description(dlts[n_dlts]));
455
456 /*
457 * OK, does tcpdump handle that type?
458 */
459 if (lookup_printer(dlts[n_dlts]) == NULL
460 && lookup_ndo_printer(dlts[n_dlts]) == NULL)
461 (void) fprintf(stderr, " (printing not supported)");
462 fprintf(stderr, "\n");
463 } else {
464 (void) fprintf(stderr, " DLT %d (printing not supported)\n",
465 dlts[n_dlts]);
466 }
467 }
468 #ifdef HAVE_PCAP_FREE_DATALINKS
469 pcap_free_datalinks(dlts);
470 #endif
471 exit(0);
472 }
473
474 /*
475 * Set up flags that might or might not be supported depending on the
476 * version of libpcap we're using.
477 */
478 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
479 #define B_FLAG "B:"
480 #define B_FLAG_USAGE " [ -B size ]"
481 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
482 #define B_FLAG
483 #define B_FLAG_USAGE
484 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
485
486 #ifdef HAVE_PCAP_CREATE
487 #define I_FLAG "I"
488 #else /* HAVE_PCAP_CREATE */
489 #define I_FLAG
490 #endif /* HAVE_PCAP_CREATE */
491
492 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
493 #define j_FLAG "j:"
494 #define j_FLAG_USAGE " [ -j tstamptype ]"
495 #define J_FLAG "J"
496 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
497 #define j_FLAG
498 #define j_FLAG_USAGE
499 #define J_FLAG
500 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
501
502 #ifdef HAVE_PCAP_FINDALLDEVS
503 #ifndef HAVE_PCAP_IF_T
504 #undef HAVE_PCAP_FINDALLDEVS
505 #endif
506 #endif
507
508 #ifdef HAVE_PCAP_FINDALLDEVS
509 #define D_FLAG "D"
510 #else
511 #define D_FLAG
512 #endif
513
514 #ifdef HAVE_PCAP_DUMP_FLUSH
515 #define U_FLAG "U"
516 #else
517 #define U_FLAG
518 #endif
519
520 #ifndef WIN32
521 /* Drop root privileges and chroot if necessary */
522 static void
523 droproot(const char *username, const char *chroot_dir)
524 {
525 struct passwd *pw = NULL;
526
527 if (chroot_dir && !username) {
528 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
529 exit(1);
530 }
531
532 pw = getpwnam(username);
533 if (pw) {
534 if (chroot_dir) {
535 if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
536 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
537 chroot_dir, pcap_strerror(errno));
538 exit(1);
539 }
540 }
541 #ifdef HAVE_CAP_NG_H
542 int ret = capng_change_id(pw->pw_uid, pw->pw_gid, CAPNG_NO_FLAG);
543 if (ret < 0) {
544 printf("error : ret %d\n", ret);
545 }
546 /* We don't need CAP_SETUID and CAP_SETGID */
547 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
548 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_SETUID);
549 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
550 capng_update(CAPNG_DROP, CAPNG_PERMITTED, CAP_SETUID);
551 capng_apply(CAPNG_SELECT_BOTH);
552
553 #else
554 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
555 setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
556 fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
557 username,
558 (unsigned long)pw->pw_uid,
559 (unsigned long)pw->pw_gid,
560 pcap_strerror(errno));
561 exit(1);
562 }
563 #endif /* HAVE_CAP_NG_H */
564 }
565 else {
566 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
567 username);
568 exit(1);
569 }
570 }
571 #endif /* WIN32 */
572
573 static int
574 getWflagChars(int x)
575 {
576 int c = 0;
577
578 x -= 1;
579 while (x > 0) {
580 c += 1;
581 x /= 10;
582 }
583
584 return c;
585 }
586
587
588 static void
589 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
590 {
591 char *filename = malloc(NAME_MAX + 1);
592 if (filename == NULL)
593 error("Makefilename: malloc);
594
595 /* Process with strftime if Gflag is set. */
596 if (Gflag != 0) {
597 struct tm *local_tm;
598
599 /* Convert Gflag_time to a usable format */
600 if ((local_tm = localtime(&Gflag_time)) == NULL) {
601 error("MakeTimedFilename: localtime");
602 }
603
604 /* There's no good way to detect an error in strftime since a return
605 * value of 0 isn't necessarily failure.
606 */
607 strftime(filename, NAME_MAX, orig_name, local_tm);
608 } else {
609 strncpy(filename, orig_name, NAME_MAX);
610 }
611
612 if (cnt == 0 && max_chars == 0)
613 strncpy(buffer, filename, NAME_MAX + 1);
614 else
615 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
616 /* Report an error if the filename is too large */
617 error("too many output files or filename is too long (> %d)", NAME_MAX);
618 free(filename);
619 }
620
621 static int tcpdump_printf(netdissect_options *ndo _U_,
622 const char *fmt, ...)
623 {
624
625 va_list args;
626 int ret;
627
628 va_start(args, fmt);
629 ret=vfprintf(stdout, fmt, args);
630 va_end(args);
631
632 return ret;
633 }
634
635 struct print_info get_print_info(int type) {
636 struct print_info printinfo;
637
638 printinfo.ndo_type = 1;
639 printinfo.ndo = gndo;
640 printinfo.p.ndo_printer = lookup_ndo_printer(type);
641 if (printinfo.p.ndo_printer == NULL) {
642 printinfo.p.printer = lookup_printer(type);
643 printinfo.ndo_type = 0;
644 if (printinfo.p.printer == NULL) {
645 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
646 if (gndo->ndo_dltname != NULL)
647 error("packet printing is not supported for link type %s: use -w",
648 gndo->ndo_dltname);
649 else
650 error("packet printing is not supported for link type %d: use -w", type);
651 }
652 }
653 return (printinfo);
654 }
655
656 char *get_next_file(FILE *VFile, char *ptr) {
657 char *ret;
658
659 ret = fgets(ptr, NAME_MAX, VFile);
660 if (!ret)
661 return NULL;
662
663 if (ptr[strlen(ptr) - 1] == '\n')
664 ptr[strlen(ptr) - 1] = '\0';
665
666 return ret;
667 }
668
669 int
670 main(int argc, char **argv)
671 {
672 register int cnt, op, i;
673 bpf_u_int32 localnet, netmask;
674 register char *cp, *infile, *cmdbuf, *device, *RFileName, *VFileName, *WFileName;
675 pcap_handler callback;
676 int type;
677 int dlt;
678 int new_dlt;
679 const char *dlt_name;
680 struct bpf_program fcode;
681 #ifndef WIN32
682 RETSIGTYPE (*oldhandler)(int);
683 #endif
684 struct print_info printinfo;
685 struct dump_info dumpinfo;
686 u_char *pcap_userdata;
687 char ebuf[PCAP_ERRBUF_SIZE];
688 char VFileLine[NAME_MAX + 1];
689 char *username = NULL;
690 char *chroot_dir = NULL;
691 char *ret = NULL;
692 #ifdef HAVE_PCAP_FINDALLDEVS
693 pcap_if_t *devpointer;
694 int devnum;
695 #endif
696 int status;
697 FILE *VFile;
698 #ifdef WIN32
699 if(wsockinit() != 0) return 1;
700 #endif /* WIN32 */
701
702 jflag=-1; /* not set */
703 gndo->ndo_Oflag=1;
704 gndo->ndo_Rflag=1;
705 gndo->ndo_dlt=-1;
706 gndo->ndo_default_print=ndo_default_print;
707 gndo->ndo_printf=tcpdump_printf;
708 gndo->ndo_error=ndo_error;
709 gndo->ndo_warning=ndo_warning;
710 gndo->ndo_snaplen = DEFAULT_SNAPLEN;
711
712 cnt = -1;
713 device = NULL;
714 infile = NULL;
715 RFileName = NULL;
716 VFileName = NULL;
717 WFileName = NULL;
718 if ((cp = strrchr(argv[0], '/')) != NULL)
719 program_name = cp + 1;
720 else
721 program_name = argv[0];
722
723 if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
724 error("%s", ebuf);
725
726 #ifdef LIBSMI
727 smiInit("tcpdump");
728 #endif
729
730 while (
731 (op = getopt(argc, argv, "aAb" B_FLAG "c:C:d" D_FLAG "eE:fF:G:hHi:" I_FLAG j_FLAG J_FLAG "KlLm:M:nNOpqr:Rs:StT:u" U_FLAG "V:vw:W:xXy:Yz:Z:")) != -1)
732 switch (op) {
733
734 case 'a':
735 /* compatibility for old -a */
736 break;
737
738 case 'A':
739 ++Aflag;
740 break;
741
742 case 'b':
743 ++bflag;
744 break;
745
746 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
747 case 'B':
748 Bflag = atoi(optarg)*1024;
749 if (Bflag <= 0)
750 error("invalid packet buffer size %s", optarg);
751 break;
752 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
753
754 case 'c':
755 cnt = atoi(optarg);
756 if (cnt <= 0)
757 error("invalid packet count %s", optarg);
758 break;
759
760 case 'C':
761 Cflag = atoi(optarg) * 1000000;
762 if (Cflag < 0)
763 error("invalid file size %s", optarg);
764 break;
765
766 case 'd':
767 ++dflag;
768 break;
769
770 #ifdef HAVE_PCAP_FINDALLDEVS
771 case 'D':
772 if (pcap_findalldevs(&devpointer, ebuf) < 0)
773 error("%s", ebuf);
774 else {
775 for (i = 0; devpointer != 0; i++) {
776 printf("%d.%s", i+1, devpointer->name);
777 if (devpointer->description != NULL)
778 printf(" (%s)", devpointer->description);
779 printf("\n");
780 devpointer = devpointer->next;
781 }
782 }
783 return 0;
784 #endif /* HAVE_PCAP_FINDALLDEVS */
785
786 case 'L':
787 Lflag++;
788 break;
789
790 case 'e':
791 ++eflag;
792 break;
793
794 case 'E':
795 #ifndef HAVE_LIBCRYPTO
796 warning("crypto code not compiled in");
797 #endif
798 gndo->ndo_espsecret = optarg;
799 break;
800
801 case 'f':
802 ++fflag;
803 break;
804
805 case 'F':
806 infile = optarg;
807 break;
808
809 case 'G':
810 Gflag = atoi(optarg);
811 if (Gflag < 0)
812 error("invalid number of seconds %s", optarg);
813
814 /* We will create one file initially. */
815 Gflag_count = 0;
816
817 /* Grab the current time for rotation use. */
818 if ((Gflag_time = time(NULL)) == (time_t)-1) {
819 error("main: can't get current time: %s",
820 pcap_strerror(errno));
821 }
822 break;
823
824 case 'h':
825 usage();
826 break;
827
828 case 'H':
829 ++Hflag;
830 break;
831
832 case 'i':
833 if (optarg[0] == '0' && optarg[1] == 0)
834 error("Invalid adapter index");
835
836 #ifdef HAVE_PCAP_FINDALLDEVS
837 /*
838 * If the argument is a number, treat it as
839 * an index into the list of adapters, as
840 * printed by "tcpdump -D".
841 *
842 * This should be OK on UNIX systems, as interfaces
843 * shouldn't have names that begin with digits.
844 * It can be useful on Windows, where more than
845 * one interface can have the same name.
846 */
847 if ((devnum = atoi(optarg)) != 0) {
848 if (devnum < 0)
849 error("Invalid adapter index");
850
851 if (pcap_findalldevs(&devpointer, ebuf) < 0)
852 error("%s", ebuf);
853 else {
854 /*
855 * Look for the devnum-th entry
856 * in the list of devices
857 * (1-based).
858 */
859 for (i = 0;
860 i < devnum-1 && devpointer != NULL;
861 i++, devpointer = devpointer->next)
862 ;
863 if (devpointer == NULL)
864 error("Invalid adapter index");
865 }
866 device = devpointer->name;
867 break;
868 }
869 #endif /* HAVE_PCAP_FINDALLDEVS */
870 device = optarg;
871 break;
872
873 #ifdef HAVE_PCAP_CREATE
874 case 'I':
875 ++Iflag;
876 break;
877 #endif /* HAVE_PCAP_CREATE */
878
879 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
880 case 'j':
881 jflag = pcap_tstamp_type_name_to_val(optarg);
882 if (jflag < 0)
883 error("invalid time stamp type %s", optarg);
884 break;
885
886 case 'J':
887 Jflag++;
888 break;
889 #endif
890
891 case 'l':
892 #ifdef WIN32
893 /*
894 * _IOLBF is the same as _IOFBF in Microsoft's C
895 * libraries; the only alternative they offer
896 * is _IONBF.
897 *
898 * XXX - this should really be checking for MSVC++,
899 * not WIN32, if, for example, MinGW has its own
900 * C library that is more UNIX-compatible.
901 */
902 setvbuf(stdout, NULL, _IONBF, 0);
903 #else /* WIN32 */
904 #ifdef HAVE_SETLINEBUF
905 setlinebuf(stdout);
906 #else
907 setvbuf(stdout, NULL, _IOLBF, 0);
908 #endif
909 #endif /* WIN32 */
910 break;
911
912 case 'K':
913 ++Kflag;
914 break;
915
916 case 'm':
917 #ifdef LIBSMI
918 if (smiLoadModule(optarg) == 0) {
919 error("could not load MIB module %s", optarg);
920 }
921 sflag = 1;
922 #else
923 (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
924 program_name, optarg);
925 (void)fprintf(stderr, "(no libsmi support)\n");
926 #endif
927 break;
928
929 case 'M':
930 /* TCP-MD5 shared secret */
931 #ifndef HAVE_LIBCRYPTO
932 warning("crypto code not compiled in");
933 #endif
934 sigsecret = optarg;
935 break;
936
937 case 'n':
938 ++nflag;
939 break;
940
941 case 'N':
942 ++Nflag;
943 break;
944
945 case 'O':
946 Oflag = 0;
947 break;
948
949 case 'p':
950 ++pflag;
951 break;
952
953 case 'q':
954 ++qflag;
955 ++suppress_default_print;
956 break;
957
958 case 'r':
959 RFileName = optarg;
960 break;
961
962 case 'R':
963 Rflag = 0;
964 break;
965
966 case 's': {
967 char *end;
968
969 snaplen = strtol(optarg, &end, 0);
970 if (optarg == end || *end != '\0'
971 || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
972 error("invalid snaplen %s", optarg);
973 else if (snaplen == 0)
974 snaplen = MAXIMUM_SNAPLEN;
975 break;
976 }
977
978 case 'S':
979 ++Sflag;
980 break;
981
982 case 't':
983 ++tflag;
984 break;
985
986 case 'T':
987 if (strcasecmp(optarg, "vat") == 0)
988 packettype = PT_VAT;
989 else if (strcasecmp(optarg, "wb") == 0)
990 packettype = PT_WB;
991 else if (strcasecmp(optarg, "rpc") == 0)
992 packettype = PT_RPC;
993 else if (strcasecmp(optarg, "rtp") == 0)
994 packettype = PT_RTP;
995 else if (strcasecmp(optarg, "rtcp") == 0)
996 packettype = PT_RTCP;
997 else if (strcasecmp(optarg, "snmp") == 0)
998 packettype = PT_SNMP;
999 else if (strcasecmp(optarg, "cnfp") == 0)
1000 packettype = PT_CNFP;
1001 else if (strcasecmp(optarg, "tftp") == 0)
1002 packettype = PT_TFTP;
1003 else if (strcasecmp(optarg, "aodv") == 0)
1004 packettype = PT_AODV;
1005 else if (strcasecmp(optarg, "carp") == 0)
1006 packettype = PT_CARP;
1007 else if (strcasecmp(optarg, "radius") == 0)
1008 packettype = PT_RADIUS;
1009 else
1010 error("unknown packet type `%s'", optarg);
1011 break;
1012
1013 case 'u':
1014 ++uflag;
1015 break;
1016
1017 #ifdef HAVE_PCAP_DUMP_FLUSH
1018 case 'U':
1019 ++Uflag;
1020 break;
1021 #endif
1022
1023 case 'v':
1024 ++vflag;
1025 break;
1026
1027 case 'V':
1028 VFileName = optarg;
1029 break;
1030
1031 case 'w':
1032 WFileName = optarg;
1033 break;
1034
1035 case 'W':
1036 Wflag = atoi(optarg);
1037 if (Wflag < 0)
1038 error("invalid number of output files %s", optarg);
1039 WflagChars = getWflagChars(Wflag);
1040 break;
1041
1042 case 'x':
1043 ++xflag;
1044 ++suppress_default_print;
1045 break;
1046
1047 case 'X':
1048 ++Xflag;
1049 ++suppress_default_print;
1050 break;
1051
1052 case 'y':
1053 gndo->ndo_dltname = optarg;
1054 gndo->ndo_dlt =
1055 pcap_datalink_name_to_val(gndo->ndo_dltname);
1056 if (gndo->ndo_dlt < 0)
1057 error("invalid data link type %s", gndo->ndo_dltname);
1058 break;
1059
1060 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
1061 case 'Y':
1062 {
1063 /* Undocumented flag */
1064 #ifdef HAVE_PCAP_DEBUG
1065 extern int pcap_debug;
1066 pcap_debug = 1;
1067 #else
1068 extern int yydebug;
1069 yydebug = 1;
1070 #endif
1071 }
1072 break;
1073 #endif
1074 case 'z':
1075 if (optarg) {
1076 zflag = strdup(optarg);
1077 } else {
1078 usage();
1079 /* NOTREACHED */
1080 }
1081 break;
1082
1083 case 'Z':
1084 if (optarg) {
1085 username = strdup(optarg);
1086 }
1087 else {
1088 usage();
1089 /* NOTREACHED */
1090 }
1091 break;
1092
1093 default:
1094 usage();
1095 /* NOTREACHED */
1096 }
1097
1098 switch (tflag) {
1099
1100 case 0: /* Default */
1101 case 4: /* Default + Date*/
1102 thiszone = gmt2local(0);
1103 break;
1104
1105 case 1: /* No time stamp */
1106 case 2: /* Unix timeval style */
1107 case 3: /* Microseconds since previous packet */
1108 case 5: /* Microseconds since first packet */
1109 break;
1110
1111 default: /* Not supported */
1112 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1113 break;
1114 }
1115
1116 if (fflag != 0 && (VFileName != NULL || RFileName != NULL))
1117 error("-f can not be used with -V or -r");
1118
1119 if (VFileName != NULL && RFileName != NULL)
1120 error("-V and -r are mutually exclusive.");
1121
1122 #ifdef WITH_CHROOT
1123 /* if run as root, prepare for chrooting */
1124 if (getuid() == 0 || geteuid() == 0) {
1125 /* future extensibility for cmd-line arguments */
1126 if (!chroot_dir)
1127 chroot_dir = WITH_CHROOT;
1128 }
1129 #endif
1130
1131 #ifdef WITH_USER
1132 /* if run as root, prepare for dropping root privileges */
1133 if (getuid() == 0 || geteuid() == 0) {
1134 /* Run with '-Z root' to restore old behaviour */
1135 if (!username)
1136 username = WITH_USER;
1137 }
1138 #endif
1139
1140 if (RFileName != NULL || VFileName != NULL) {
1141 #ifndef WIN32
1142 /*
1143 * We don't need network access, so relinquish any set-UID
1144 * or set-GID privileges we have (if any).
1145 *
1146 * We do *not* want set-UID privileges when opening a
1147 * trace file, as that might let the user read other
1148 * people's trace files (especially if we're set-UID
1149 * root).
1150 */
1151 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1152 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1153 #endif /* WIN32 */
1154 if (VFileName != NULL) {
1155 if (VFileName[0] == '-' && VFileName[1] == '\0')
1156 VFile = stdin;
1157 else
1158 VFile = fopen(VFileName, "r");
1159
1160 if (VFile == NULL)
1161 error("Unable to open file: %s\n", strerror(errno));
1162
1163 ret = get_next_file(VFile, VFileLine);
1164 if (!ret)
1165 error("Nothing in %s\n", VFileName);
1166 RFileName = VFileLine;
1167 }
1168
1169 pd = pcap_open_offline(RFileName, ebuf);
1170 if (pd == NULL)
1171 error("%s", ebuf);
1172 dlt = pcap_datalink(pd);
1173 dlt_name = pcap_datalink_val_to_name(dlt);
1174 if (dlt_name == NULL) {
1175 fprintf(stderr, "reading from file %s, link-type %u\n",
1176 RFileName, dlt);
1177 } else {
1178 fprintf(stderr,
1179 "reading from file %s, link-type %s (%s)\n",
1180 RFileName, dlt_name,
1181 pcap_datalink_val_to_description(dlt));
1182 }
1183 localnet = 0;
1184 netmask = 0;
1185 } else {
1186 if (device == NULL) {
1187 device = pcap_lookupdev(ebuf);
1188 if (device == NULL)
1189 error("%s", ebuf);
1190 }
1191 #ifdef WIN32
1192 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1193 { //a Unicode string has a \0 as second byte (so strlen() is 1)
1194 fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1195 }
1196 else
1197 {
1198 fprintf(stderr, "%s: listening on %s\n", program_name, device);
1199 }
1200
1201 fflush(stderr);
1202 #endif /* WIN32 */
1203 #ifdef HAVE_PCAP_CREATE
1204 pd = pcap_create(device, ebuf);
1205 if (pd == NULL)
1206 error("%s", ebuf);
1207 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1208 if (Jflag)
1209 show_tstamp_types_and_exit(device, pd);
1210 #endif
1211 /*
1212 * Is this an interface that supports monitor mode?
1213 */
1214 if (pcap_can_set_rfmon(pd) == 1)
1215 supports_monitor_mode = 1;
1216 else
1217 supports_monitor_mode = 0;
1218 status = pcap_set_snaplen(pd, snaplen);
1219 if (status != 0)
1220 error("%s: Can't set snapshot length: %s",
1221 device, pcap_statustostr(status));
1222 status = pcap_set_promisc(pd, !pflag);
1223 if (status != 0)
1224 error("%s: Can't set promiscuous mode: %s",
1225 device, pcap_statustostr(status));
1226 if (Iflag) {
1227 status = pcap_set_rfmon(pd, 1);
1228 if (status != 0)
1229 error("%s: Can't set monitor mode: %s",
1230 device, pcap_statustostr(status));
1231 }
1232 status = pcap_set_timeout(pd, 1000);
1233 if (status != 0)
1234 error("%s: pcap_set_timeout failed: %s",
1235 device, pcap_statustostr(status));
1236 if (Bflag != 0) {
1237 status = pcap_set_buffer_size(pd, Bflag);
1238 if (status != 0)
1239 error("%s: Can't set buffer size: %s",
1240 device, pcap_statustostr(status));
1241 }
1242 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1243 if (jflag != -1) {
1244 status = pcap_set_tstamp_type(pd, jflag);
1245 if (status < 0)
1246 error("%s: Can't set time stamp type: %s",
1247 device, pcap_statustostr(status));
1248 }
1249 #endif
1250 status = pcap_activate(pd);
1251 if (status < 0) {
1252 /*
1253 * pcap_activate() failed.
1254 */
1255 cp = pcap_geterr(pd);
1256 if (status == PCAP_ERROR)
1257 error("%s", cp);
1258 else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1259 status == PCAP_ERROR_PERM_DENIED) &&
1260 *cp != '\0')
1261 error("%s: %s\n(%s)", device,
1262 pcap_statustostr(status), cp);
1263 else
1264 error("%s: %s", device,
1265 pcap_statustostr(status));
1266 } else if (status > 0) {
1267 /*
1268 * pcap_activate() succeeded, but it's warning us
1269 * of a problem it had.
1270 */
1271 cp = pcap_geterr(pd);
1272 if (status == PCAP_WARNING)
1273 warning("%s", cp);
1274 else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1275 *cp != '\0')
1276 warning("%s: %s\n(%s)", device,
1277 pcap_statustostr(status), cp);
1278 else
1279 warning("%s: %s", device,
1280 pcap_statustostr(status));
1281 }
1282 #else
1283 *ebuf = '\0';
1284 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1285 if (pd == NULL)
1286 error("%s", ebuf);
1287 else if (*ebuf)
1288 warning("%s", ebuf);
1289 #endif /* HAVE_PCAP_CREATE */
1290 /*
1291 * Let user own process after socket has been opened.
1292 */
1293 #ifndef WIN32
1294 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1295 fprintf(stderr, "Warning: setgid/setuid failed !\n");
1296 #endif /* WIN32 */
1297 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1298 if(Bflag != 0)
1299 if(pcap_setbuff(pd, Bflag)==-1){
1300 error("%s", pcap_geterr(pd));
1301 }
1302 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1303 if (Lflag)
1304 show_dlts_and_exit(device, pd);
1305 if (gndo->ndo_dlt >= 0) {
1306 #ifdef HAVE_PCAP_SET_DATALINK
1307 if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1308 error("%s", pcap_geterr(pd));
1309 #else
1310 /*
1311 * We don't actually support changing the
1312 * data link type, so we only let them
1313 * set it to what it already is.
1314 */
1315 if (gndo->ndo_dlt != pcap_datalink(pd)) {
1316 error("%s is not one of the DLTs supported by this device\n",
1317 gndo->ndo_dltname);
1318 }
1319 #endif
1320 (void)fprintf(stderr, "%s: data link type %s\n",
1321 program_name, gndo->ndo_dltname);
1322 (void)fflush(stderr);
1323 }
1324 i = pcap_snapshot(pd);
1325 if (snaplen < i) {
1326 warning("snaplen raised from %d to %d", snaplen, i);
1327 snaplen = i;
1328 }
1329 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1330 localnet = 0;
1331 netmask = 0;
1332 warning("%s", ebuf);
1333 }
1334 }
1335 if (infile)
1336 cmdbuf = read_infile(infile);
1337 else
1338 cmdbuf = copy_argv(&argv[optind]);
1339
1340 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1341 error("%s", pcap_geterr(pd));
1342 if (dflag) {
1343 bpf_dump(&fcode, dflag);
1344 pcap_close(pd);
1345 free(cmdbuf);
1346 exit(0);
1347 }
1348 init_addrtoname(localnet, netmask);
1349 init_checksum();
1350
1351 #ifndef WIN32
1352 (void)setsignal(SIGPIPE, cleanup);
1353 (void)setsignal(SIGTERM, cleanup);
1354 (void)setsignal(SIGINT, cleanup);
1355 #endif /* WIN32 */
1356 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1357 (void)setsignal(SIGCHLD, child_cleanup);
1358 #endif
1359 /* Cooperate with nohup(1) */
1360 #ifndef WIN32
1361 if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1362 (void)setsignal(SIGHUP, oldhandler);
1363 #endif /* WIN32 */
1364
1365 #ifndef WIN32
1366 /*
1367 * If a user name was specified with "-Z", attempt to switch to
1368 * that user's UID. This would probably be used with sudo,
1369 * to allow tcpdump to be run in a special restricted
1370 * account (if you just want to allow users to open capture
1371 * devices, and can't just give users that permission,
1372 * you'd make tcpdump set-UID or set-GID).
1373 *
1374 * Tcpdump doesn't necessarily write only to one savefile;
1375 * the general only way to allow a -Z instance to write to
1376 * savefiles as the user under whose UID it's run, rather
1377 * than as the user specified with -Z, would thus be to switch
1378 * to the original user ID before opening a capture file and
1379 * then switch back to the -Z user ID after opening the savefile.
1380 * Switching to the -Z user ID only after opening the first
1381 * savefile doesn't handle the general case.
1382 */
1383
1384 #ifdef HAVE_CAP_NG_H
1385 /* We are running as root and we will be writing to savefile */
1386 if ((getuid() == 0 || geteuid() == 0) && WFileName) {
1387 if (username) {
1388 /* Drop all capabilities from effective set */
1389 capng_clear(CAPNG_EFFECTIVE);
1390 /* Add capabilities we will need*/
1391 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETUID);
1392 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_SETGID);
1393 capng_update(CAPNG_ADD, CAPNG_PERMITTED, CAP_DAC_OVERRIDE);
1394
1395 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETUID);
1396 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_SETGID);
1397 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1398
1399 capng_apply(CAPNG_SELECT_BOTH);
1400 }
1401 }
1402 #endif /* HAVE_CAP_NG_H */
1403
1404 if (getuid() == 0 || geteuid() == 0) {
1405 if (username || chroot_dir)
1406 droproot(username, chroot_dir);
1407
1408 }
1409 #endif /* WIN32 */
1410
1411 if (pcap_setfilter(pd, &fcode) < 0)
1412 error("%s", pcap_geterr(pd));
1413 if (WFileName) {
1414 pcap_dumper_t *p;
1415 /* Do not exceed the default NAME_MAX for files. */
1416 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1417
1418 if (dumpinfo.CurrentFileName == NULL)
1419 error("malloc of dumpinfo.CurrentFileName");
1420
1421 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1422 if (Cflag != 0)
1423 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1424 else
1425 MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1426
1427 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1428 #ifdef HAVE_CAP_NG_H
1429 /* Give up capabilities, clear Effective set */
1430 capng_clear(CAPNG_EFFECTIVE);
1431 #endif
1432 if (p == NULL)
1433 error("%s", pcap_geterr(pd));
1434 if (Cflag != 0 || Gflag != 0) {
1435 callback = dump_packet_and_trunc;
1436 dumpinfo.WFileName = WFileName;
1437 dumpinfo.pd = pd;
1438 dumpinfo.p = p;
1439 pcap_userdata = (u_char *)&dumpinfo;
1440 } else {
1441 callback = dump_packet;
1442 pcap_userdata = (u_char *)p;
1443 }
1444 #ifdef HAVE_PCAP_DUMP_FLUSH
1445 if (Uflag)
1446 pcap_dump_flush(p);
1447 #endif
1448 } else {
1449 type = pcap_datalink(pd);
1450 printinfo = get_print_info(type);
1451 callback = print_packet;
1452 pcap_userdata = (u_char *)&printinfo;
1453 }
1454
1455 #ifdef SIGNAL_REQ_INFO
1456 /*
1457 * We can't get statistics when reading from a file rather
1458 * than capturing from a device.
1459 */
1460 if (RFileName == NULL)
1461 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1462 #endif
1463
1464 if (vflag > 0 && WFileName) {
1465 /*
1466 * When capturing to a file, "-v" means tcpdump should,
1467 * every 10 secodns, "v"erbosely report the number of
1468 * packets captured.
1469 */
1470 #ifdef USE_WIN32_MM_TIMER
1471 /* call verbose_stats_dump() each 1000 +/-100msec */
1472 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1473 setvbuf(stderr, NULL, _IONBF, 0);
1474 #elif defined(HAVE_ALARM)
1475 (void)setsignal(SIGALRM, verbose_stats_dump);
1476 alarm(1);
1477 #endif
1478 }
1479
1480 #ifndef WIN32
1481 if (RFileName == NULL) {
1482 if (!vflag && !WFileName) {
1483 (void)fprintf(stderr,
1484 "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1485 program_name);
1486 } else
1487 (void)fprintf(stderr, "%s: ", program_name);
1488 dlt = pcap_datalink(pd);
1489 dlt_name = pcap_datalink_val_to_name(dlt);
1490 if (dlt_name == NULL) {
1491 (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1492 device, dlt, snaplen);
1493 } else {
1494 (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1495 device, dlt_name,
1496 pcap_datalink_val_to_description(dlt), snaplen);
1497 }
1498 (void)fflush(stderr);
1499 }
1500 #endif /* WIN32 */
1501 do {
1502 status = pcap_loop(pd, cnt, callback, pcap_userdata);
1503 if (WFileName == NULL) {
1504 /*
1505 * We're printing packets. Flush the printed output,
1506 * so it doesn't get intermingled with error output.
1507 */
1508 if (status == -2) {
1509 /*
1510 * We got interrupted, so perhaps we didn't
1511 * manage to finish a line we were printing.
1512 * Print an extra newline, just in case.
1513 */
1514 putchar('\n');
1515 }
1516 (void)fflush(stdout);
1517 }
1518 if (status == -1) {
1519 /*
1520 * Error. Report it.
1521 */
1522 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1523 program_name, pcap_geterr(pd));
1524 }
1525 if (RFileName == NULL) {
1526 /*
1527 * We're doing a live capture. Report the capture
1528 * statistics.
1529 */
1530 info(1);
1531 }
1532 pcap_close(pd);
1533 if (VFileName != NULL) {
1534 ret = get_next_file(VFile, VFileLine);
1535 if (ret) {
1536 RFileName = VFileLine;
1537 pd = pcap_open_offline(RFileName, ebuf);
1538 if (pd == NULL)
1539 error("%s", ebuf);
1540 new_dlt = pcap_datalink(pd);
1541 if (WFileName && new_dlt != dlt)
1542 error("%s: new dlt does not match original", RFileName);
1543 printinfo = get_print_info(new_dlt);
1544 dlt_name = pcap_datalink_val_to_name(new_dlt);
1545 if (dlt_name == NULL) {
1546 fprintf(stderr, "reading from file %s, link-type %u\n",
1547 RFileName, new_dlt);
1548 } else {
1549 fprintf(stderr,
1550 "reading from file %s, link-type %s (%s)\n",
1551 RFileName, dlt_name,
1552 pcap_datalink_val_to_description(new_dlt));
1553 }
1554 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1555 error("%s", pcap_geterr(pd));
1556 if (pcap_setfilter(pd, &fcode) < 0)
1557 error("%s", pcap_geterr(pd));
1558 }
1559 }
1560 }
1561 while (ret != NULL);
1562
1563 free(cmdbuf);
1564 exit(status == -1 ? 1 : 0);
1565 }
1566
1567 /* make a clean exit on interrupts */
1568 static RETSIGTYPE
1569 cleanup(int signo _U_)
1570 {
1571 #ifdef USE_WIN32_MM_TIMER
1572 if (timer_id)
1573 timeKillEvent(timer_id);
1574 timer_id = 0;
1575 #elif defined(HAVE_ALARM)
1576 alarm(0);
1577 #endif
1578
1579 #ifdef HAVE_PCAP_BREAKLOOP
1580 /*
1581 * We have "pcap_breakloop()"; use it, so that we do as little
1582 * as possible in the signal handler (it's probably not safe
1583 * to do anything with standard I/O streams in a signal handler -
1584 * the ANSI C standard doesn't say it is).
1585 */
1586 pcap_breakloop(pd);
1587 #else
1588 /*
1589 * We don't have "pcap_breakloop()"; this isn't safe, but
1590 * it's the best we can do. Print the summary if we're
1591 * not reading from a savefile - i.e., if we're doing a
1592 * live capture - and exit.
1593 */
1594 if (pd != NULL && pcap_file(pd) == NULL) {
1595 /*
1596 * We got interrupted, so perhaps we didn't
1597 * manage to finish a line we were printing.
1598 * Print an extra newline, just in case.
1599 */
1600 putchar('\n');
1601 (void)fflush(stdout);
1602 info(1);
1603 }
1604 exit(0);
1605 #endif
1606 }
1607
1608 /*
1609 On windows, we do not use a fork, so we do not care less about
1610 waiting a child processes to die
1611 */
1612 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1613 static RETSIGTYPE
1614 child_cleanup(int signo _U_)
1615 {
1616 wait(NULL);
1617 }
1618 #endif /* HAVE_FORK && HAVE_VFORK */
1619
1620 static void
1621 info(register int verbose)
1622 {
1623 struct pcap_stat stat;
1624
1625 /*
1626 * Older versions of libpcap didn't set ps_ifdrop on some
1627 * platforms; initialize it to 0 to handle that.
1628 */
1629 stat.ps_ifdrop = 0;
1630 if (pcap_stats(pd, &stat) < 0) {
1631 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1632 infoprint = 0;
1633 return;
1634 }
1635
1636 if (!verbose)
1637 fprintf(stderr, "%s: ", program_name);
1638
1639 (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1640 PLURAL_SUFFIX(packets_captured));
1641 if (!verbose)
1642 fputs(", ", stderr);
1643 else
1644 putc('\n', stderr);
1645 (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1646 PLURAL_SUFFIX(stat.ps_recv));
1647 if (!verbose)
1648 fputs(", ", stderr);
1649 else
1650 putc('\n', stderr);
1651 (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1652 PLURAL_SUFFIX(stat.ps_drop));
1653 if (stat.ps_ifdrop != 0) {
1654 if (!verbose)
1655 fputs(", ", stderr);
1656 else
1657 putc('\n', stderr);
1658 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1659 stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1660 } else
1661 putc('\n', stderr);
1662 infoprint = 0;
1663 }
1664
1665 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1666 static void
1667 compress_savefile(const char *filename)
1668 {
1669 # ifdef HAVE_FORK
1670 if (fork())
1671 # else
1672 if (vfork())
1673 # endif
1674 return;
1675 /*
1676 * Set to lowest priority so that this doesn't disturb the capture
1677 */
1678 #ifdef NZERO
1679 setpriority(PRIO_PROCESS, 0, NZERO - 1);
1680 #else
1681 setpriority(PRIO_PROCESS, 0, 19);
1682 #endif
1683 if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1684 fprintf(stderr,
1685 "compress_savefile:execlp(%s, %s): %s\n",
1686 zflag,
1687 filename,
1688 strerror(errno));
1689 # ifdef HAVE_FORK
1690 exit(1);
1691 # else
1692 _exit(1);
1693 # endif
1694 }
1695 #else /* HAVE_FORK && HAVE_VFORK */
1696 static void
1697 compress_savefile(const char *filename)
1698 {
1699 fprintf(stderr,
1700 "compress_savefile failed. Functionality not implemented under your system\n");
1701 }
1702 #endif /* HAVE_FORK && HAVE_VFORK */
1703
1704 static void
1705 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1706 {
1707 struct dump_info *dump_info;
1708
1709 ++packets_captured;
1710
1711 ++infodelay;
1712
1713 dump_info = (struct dump_info *)user;
1714
1715 /*
1716 * XXX - this won't force the file to rotate on the specified time
1717 * boundary, but it will rotate on the first packet received after the
1718 * specified Gflag number of seconds. Note: if a Gflag time boundary
1719 * and a Cflag size boundary coincide, the time rotation will occur
1720 * first thereby cancelling the Cflag boundary (since the file should
1721 * be 0).
1722 */
1723 if (Gflag != 0) {
1724 /* Check if it is time to rotate */
1725 time_t t;
1726
1727 /* Get the current time */
1728 if ((t = time(NULL)) == (time_t)-1) {
1729 error("dump_and_trunc_packet: can't get current_time: %s",
1730 pcap_strerror(errno));
1731 }
1732
1733
1734 /* If the time is greater than the specified window, rotate */
1735 if (t - Gflag_time >= Gflag) {
1736 /* Update the Gflag_time */
1737 Gflag_time = t;
1738 /* Update Gflag_count */
1739 Gflag_count++;
1740 /*
1741 * Close the current file and open a new one.
1742 */
1743 pcap_dump_close(dump_info->p);
1744
1745 /*
1746 * Compress the file we just closed, if the user asked for it
1747 */
1748 if (zflag != NULL)
1749 compress_savefile(dump_info->CurrentFileName);
1750
1751 /*
1752 * Check to see if we've exceeded the Wflag (when
1753 * not using Cflag).
1754 */
1755 if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1756 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1757 Wflag);
1758 exit(0);
1759 /* NOTREACHED */
1760 }
1761 if (dump_info->CurrentFileName != NULL)
1762 free(dump_info->CurrentFileName);
1763 /* Allocate space for max filename + \0. */
1764 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1765 if (dump_info->CurrentFileName == NULL)
1766 error("dump_packet_and_trunc: malloc");
1767 /*
1768 * This is always the first file in the Cflag
1769 * rotation: e.g. 0
1770 * We also don't need numbering if Cflag is not set.
1771 */
1772 if (Cflag != 0)
1773 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1774 WflagChars);
1775 else
1776 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1777
1778 #ifdef HAVE_CAP_NG_H
1779 capng_update(CAPNG_ADD, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1780 capng_apply(CAPNG_EFFECTIVE);
1781 #endif /* HAVE_CAP_NG_H */
1782 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1783 #ifdef HAVE_CAP_NG_H
1784 capng_update(CAPNG_DROP, CAPNG_EFFECTIVE, CAP_DAC_OVERRIDE);
1785 capng_apply(CAPNG_EFFECTIVE);
1786 #endif /* HAVE_CAP_NG_H */
1787 if (dump_info->p == NULL)
1788 error("%s", pcap_geterr(pd));
1789 }
1790 }
1791
1792 /*
1793 * XXX - this won't prevent capture files from getting
1794 * larger than Cflag - the last packet written to the
1795 * file could put it over Cflag.
1796 */
1797 if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1798 /*
1799 * Close the current file and open a new one.
1800 */
1801 pcap_dump_close(dump_info->p);
1802
1803 /*
1804 * Compress the file we just closed, if the user asked for it
1805 */
1806 if (zflag != NULL)
1807 compress_savefile(dump_info->CurrentFileName);
1808
1809 Cflag_count++;
1810 if (Wflag > 0) {
1811 if (Cflag_count >= Wflag)
1812 Cflag_count = 0;
1813 }
1814 if (dump_info->CurrentFileName != NULL)
1815 free(dump_info->CurrentFileName);
1816 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1817 if (dump_info->CurrentFileName == NULL)
1818 error("dump_packet_and_trunc: malloc");
1819 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1820 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1821 if (dump_info->p == NULL)
1822 error("%s", pcap_geterr(pd));
1823 }
1824
1825 pcap_dump((u_char *)dump_info->p, h, sp);
1826 #ifdef HAVE_PCAP_DUMP_FLUSH
1827 if (Uflag)
1828 pcap_dump_flush(dump_info->p);
1829 #endif
1830
1831 --infodelay;
1832 if (infoprint)
1833 info(0);
1834 }
1835
1836 static void
1837 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1838 {
1839 ++packets_captured;
1840
1841 ++infodelay;
1842
1843 pcap_dump(user, h, sp);
1844 #ifdef HAVE_PCAP_DUMP_FLUSH
1845 if (Uflag)
1846 pcap_dump_flush((pcap_dumper_t *)user);
1847 #endif
1848
1849 --infodelay;
1850 if (infoprint)
1851 info(0);
1852 }
1853
1854 static void
1855 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1856 {
1857 struct print_info *print_info;
1858 u_int hdrlen;
1859
1860 ++packets_captured;
1861
1862 ++infodelay;
1863 ts_print(&h->ts);
1864
1865 print_info = (struct print_info *)user;
1866
1867 /*
1868 * Some printers want to check that they're not walking off the
1869 * end of the packet.
1870 * Rather than pass it all the way down, we set this global.
1871 */
1872 snapend = sp + h->caplen;
1873
1874 if(print_info->ndo_type) {
1875 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1876 } else {
1877 hdrlen = (*print_info->p.printer)(h, sp);
1878 }
1879
1880 if (Xflag) {
1881 /*
1882 * Print the raw packet data in hex and ASCII.
1883 */
1884 if (Xflag > 1) {
1885 /*
1886 * Include the link-layer header.
1887 */
1888 hex_and_ascii_print("\n\t", sp, h->caplen);
1889 } else {
1890 /*
1891 * Don't include the link-layer header - and if
1892 * we have nothing past the link-layer header,
1893 * print nothing.
1894 */
1895 if (h->caplen > hdrlen)
1896 hex_and_ascii_print("\n\t", sp + hdrlen,
1897 h->caplen - hdrlen);
1898 }
1899 } else if (xflag) {
1900 /*
1901 * Print the raw packet data in hex.
1902 */
1903 if (xflag > 1) {
1904 /*
1905 * Include the link-layer header.
1906 */
1907 hex_print("\n\t", sp, h->caplen);
1908 } else {
1909 /*
1910 * Don't include the link-layer header - and if
1911 * we have nothing past the link-layer header,
1912 * print nothing.
1913 */
1914 if (h->caplen > hdrlen)
1915 hex_print("\n\t", sp + hdrlen,
1916 h->caplen - hdrlen);
1917 }
1918 } else if (Aflag) {
1919 /*
1920 * Print the raw packet data in ASCII.
1921 */
1922 if (Aflag > 1) {
1923 /*
1924 * Include the link-layer header.
1925 */
1926 ascii_print(sp, h->caplen);
1927 } else {
1928 /*
1929 * Don't include the link-layer header - and if
1930 * we have nothing past the link-layer header,
1931 * print nothing.
1932 */
1933 if (h->caplen > hdrlen)
1934 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1935 }
1936 }
1937
1938 putchar('\n');
1939
1940 --infodelay;
1941 if (infoprint)
1942 info(0);
1943 }
1944
1945 #ifdef WIN32
1946 /*
1947 * XXX - there should really be libpcap calls to get the version
1948 * number as a string (the string would be generated from #defines
1949 * at run time, so that it's not generated from string constants
1950 * in the library, as, on many UNIX systems, those constants would
1951 * be statically linked into the application executable image, and
1952 * would thus reflect the version of libpcap on the system on
1953 * which the application was *linked*, not the system on which it's
1954 * *running*.
1955 *
1956 * That routine should be documented, unlike the "version[]"
1957 * string, so that UNIX vendors providing their own libpcaps
1958 * don't omit it (as a couple of vendors have...).
1959 *
1960 * Packet.dll should perhaps also export a routine to return the
1961 * version number of the Packet.dll code, to supply the
1962 * "Wpcap_version" information on Windows.
1963 */
1964 char WDversion[]="current-cvs.tcpdump.org";
1965 #if !defined(HAVE_GENERATED_VERSION)
1966 char version[]="current-cvs.tcpdump.org";
1967 #endif
1968 char pcap_version[]="current-cvs.tcpdump.org";
1969 char Wpcap_version[]="3.1";
1970 #endif
1971
1972 /*
1973 * By default, print the specified data out in hex and ASCII.
1974 */
1975 static void
1976 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1977 {
1978 hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1979 }
1980
1981 void
1982 default_print(const u_char *bp, u_int length)
1983 {
1984 ndo_default_print(gndo, bp, length);
1985 }
1986
1987 #ifdef SIGNAL_REQ_INFO
1988 RETSIGTYPE requestinfo(int signo _U_)
1989 {
1990 if (infodelay)
1991 ++infoprint;
1992 else
1993 info(0);
1994 }
1995 #endif
1996
1997 /*
1998 * Called once each second in verbose mode while dumping to file
1999 */
2000 #ifdef USE_WIN32_MM_TIMER
2001 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
2002 DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
2003 {
2004 struct pcap_stat stat;
2005
2006 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2007 fprintf(stderr, "Got %u\r", packets_captured);
2008 }
2009 #elif defined(HAVE_ALARM)
2010 static void verbose_stats_dump(int sig _U_)
2011 {
2012 struct pcap_stat stat;
2013
2014 if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
2015 fprintf(stderr, "Got %u\r", packets_captured);
2016 alarm(1);
2017 }
2018 #endif
2019
2020 static void
2021 usage(void)
2022 {
2023 extern char version[];
2024 #ifndef HAVE_PCAP_LIB_VERSION
2025 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
2026 extern char pcap_version[];
2027 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2028 static char pcap_version[] = "unknown";
2029 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
2030 #endif /* HAVE_PCAP_LIB_VERSION */
2031
2032 #ifdef HAVE_PCAP_LIB_VERSION
2033 #ifdef WIN32
2034 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2035 #else /* WIN32 */
2036 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2037 #endif /* WIN32 */
2038 (void)fprintf(stderr, "%s\n",pcap_lib_version());
2039 #else /* HAVE_PCAP_LIB_VERSION */
2040 #ifdef WIN32
2041 (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
2042 (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
2043 #else /* WIN32 */
2044 (void)fprintf(stderr, "%s version %s\n", program_name, version);
2045 (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
2046 #endif /* WIN32 */
2047 #endif /* HAVE_PCAP_LIB_VERSION */
2048 (void)fprintf(stderr,
2049 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
2050 (void)fprintf(stderr,
2051 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
2052 (void)fprintf(stderr,
2053 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
2054 (void)fprintf(stderr,
2055 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -V file ] [ -w file ]\n");
2056 (void)fprintf(stderr,
2057 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
2058 (void)fprintf(stderr,
2059 "\t\t[ -Z user ] [ expression ]\n");
2060 exit(1);
2061 }
2062
2063
2064
2065 /* VARARGS */
2066 static void
2067 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
2068 {
2069 va_list ap;
2070
2071 (void)fprintf(stderr, "%s: ", program_name);
2072 va_start(ap, fmt);
2073 (void)vfprintf(stderr, fmt, ap);
2074 va_end(ap);
2075 if (*fmt) {
2076 fmt += strlen(fmt);
2077 if (fmt[-1] != '\n')
2078 (void)fputc('\n', stderr);
2079 }
2080 exit(1);
2081 /* NOTREACHED */
2082 }
2083
2084 /* VARARGS */
2085 static void
2086 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
2087 {
2088 va_list ap;
2089
2090 (void)fprintf(stderr, "%s: WARNING: ", program_name);
2091 va_start(ap, fmt);
2092 (void)vfprintf(stderr, fmt, ap);
2093 va_end(ap);
2094 if (*fmt) {
2095 fmt += strlen(fmt);
2096 if (fmt[-1] != '\n')
2097 (void)fputc('\n', stderr);
2098 }
2099 }
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