Import tcpdump-4.3.0.
[dragonfly.git] / contrib / 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
78 #include "netdissect.h"
79 #include "interface.h"
80 #include "addrtoname.h"
81 #include "machdep.h"
82 #include "setsignal.h"
83 #include "gmt2local.h"
84 #include "pcap-missing.h"
85
86 #ifndef NAME_MAX
87 #define NAME_MAX 255
88 #endif
89
90 #ifdef SIGINFO
91 #define SIGNAL_REQ_INFO SIGINFO
92 #elif SIGUSR1
93 #define SIGNAL_REQ_INFO SIGUSR1
94 #endif
95
96 netdissect_options Gndo;
97 netdissect_options *gndo = &Gndo;
98
99 static int dflag;                       /* print filter code */
100 static int Lflag;                       /* list available data link types and exit */
101 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
102 static int Jflag;                       /* list available time stamp types */
103 #endif
104 static char *zflag = NULL;              /* compress each savefile using a specified command (like gzip or bzip2) */
105
106 static int infodelay;
107 static int infoprint;
108
109 char *program_name;
110
111 int32_t thiszone;               /* seconds offset from gmt to local time */
112
113 /* Forwards */
114 static RETSIGTYPE cleanup(int);
115 static RETSIGTYPE child_cleanup(int);
116 static void usage(void) __attribute__((noreturn));
117 static void show_dlts_and_exit(const char *device, pcap_t *pd) __attribute__((noreturn));
118
119 static void print_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
120 static void ndo_default_print(netdissect_options *, const u_char *, u_int);
121 static void dump_packet_and_trunc(u_char *, const struct pcap_pkthdr *, const u_char *);
122 static void dump_packet(u_char *, const struct pcap_pkthdr *, const u_char *);
123 static void droproot(const char *, const char *);
124 static void ndo_error(netdissect_options *ndo, const char *fmt, ...)
125      __attribute__ ((noreturn, format (printf, 2, 3)));
126 static void ndo_warning(netdissect_options *ndo, const char *fmt, ...);
127
128 #ifdef SIGNAL_REQ_INFO
129 RETSIGTYPE requestinfo(int);
130 #endif
131
132 #if defined(USE_WIN32_MM_TIMER)
133   #include <MMsystem.h>
134   static UINT timer_id;
135   static void CALLBACK verbose_stats_dump(UINT, UINT, DWORD_PTR, DWORD_PTR, DWORD_PTR);
136 #elif defined(HAVE_ALARM)
137   static void verbose_stats_dump(int sig);
138 #endif
139
140 static void info(int);
141 static u_int packets_captured;
142
143 struct printer {
144         if_printer f;
145         int type;
146 };
147
148
149 struct ndo_printer {
150         if_ndo_printer f;
151         int type;
152 };
153
154
155 static struct printer printers[] = {
156         { arcnet_if_print,      DLT_ARCNET },
157 #ifdef DLT_ARCNET_LINUX
158         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
159 #endif
160         { token_if_print,       DLT_IEEE802 },
161 #ifdef DLT_LANE8023
162         { lane_if_print,        DLT_LANE8023 },
163 #endif
164 #ifdef DLT_CIP
165         { cip_if_print,         DLT_CIP },
166 #endif
167 #ifdef DLT_ATM_CLIP
168         { cip_if_print,         DLT_ATM_CLIP },
169 #endif
170         { sl_if_print,          DLT_SLIP },
171 #ifdef DLT_SLIP_BSDOS
172         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
173 #endif
174         { ppp_if_print,         DLT_PPP },
175 #ifdef DLT_PPP_WITHDIRECTION
176         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
177 #endif
178 #ifdef DLT_PPP_BSDOS
179         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
180 #endif
181         { fddi_if_print,        DLT_FDDI },
182         { null_if_print,        DLT_NULL },
183 #ifdef DLT_LOOP
184         { null_if_print,        DLT_LOOP },
185 #endif
186         { raw_if_print,         DLT_RAW },
187         { atm_if_print,         DLT_ATM_RFC1483 },
188 #ifdef DLT_C_HDLC
189         { chdlc_if_print,       DLT_C_HDLC },
190 #endif
191 #ifdef DLT_HDLC
192         { chdlc_if_print,       DLT_HDLC },
193 #endif
194 #ifdef DLT_PPP_SERIAL
195         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
196 #endif
197 #ifdef DLT_PPP_ETHER
198         { pppoe_if_print,       DLT_PPP_ETHER },
199 #endif
200 #ifdef DLT_LINUX_SLL
201         { sll_if_print,         DLT_LINUX_SLL },
202 #endif
203 #ifdef DLT_IEEE802_11
204         { ieee802_11_if_print,  DLT_IEEE802_11},
205 #endif
206 #ifdef DLT_LTALK
207         { ltalk_if_print,       DLT_LTALK },
208 #endif
209 #if defined(DLT_PFLOG) && defined(HAVE_NET_PFVAR_H)
210         { pflog_if_print,       DLT_PFLOG },
211 #endif
212 #ifdef DLT_FR
213         { fr_if_print,          DLT_FR },
214 #endif
215 #ifdef DLT_FRELAY
216         { fr_if_print,          DLT_FRELAY },
217 #endif
218 #ifdef DLT_SUNATM
219         { sunatm_if_print,      DLT_SUNATM },
220 #endif
221 #ifdef DLT_IP_OVER_FC
222         { ipfc_if_print,        DLT_IP_OVER_FC },
223 #endif
224 #ifdef DLT_PRISM_HEADER
225         { prism_if_print,       DLT_PRISM_HEADER },
226 #endif
227 #ifdef DLT_IEEE802_11_RADIO
228         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
229 #endif
230 #ifdef DLT_ENC
231         { enc_if_print,         DLT_ENC },
232 #endif
233 #ifdef DLT_SYMANTEC_FIREWALL
234         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
235 #endif
236 #ifdef DLT_APPLE_IP_OVER_IEEE1394
237         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
238 #endif
239 #ifdef DLT_IEEE802_11_RADIO_AVS
240         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
241 #endif
242 #ifdef DLT_JUNIPER_ATM1
243         { juniper_atm1_print,   DLT_JUNIPER_ATM1 },
244 #endif
245 #ifdef DLT_JUNIPER_ATM2
246         { juniper_atm2_print,   DLT_JUNIPER_ATM2 },
247 #endif
248 #ifdef DLT_JUNIPER_MFR
249         { juniper_mfr_print,    DLT_JUNIPER_MFR },
250 #endif
251 #ifdef DLT_JUNIPER_MLFR
252         { juniper_mlfr_print,   DLT_JUNIPER_MLFR },
253 #endif
254 #ifdef DLT_JUNIPER_MLPPP
255         { juniper_mlppp_print,  DLT_JUNIPER_MLPPP },
256 #endif
257 #ifdef DLT_JUNIPER_PPPOE
258         { juniper_pppoe_print,  DLT_JUNIPER_PPPOE },
259 #endif
260 #ifdef DLT_JUNIPER_PPPOE_ATM
261         { juniper_pppoe_atm_print, DLT_JUNIPER_PPPOE_ATM },
262 #endif
263 #ifdef DLT_JUNIPER_GGSN
264         { juniper_ggsn_print,   DLT_JUNIPER_GGSN },
265 #endif
266 #ifdef DLT_JUNIPER_ES
267         { juniper_es_print,     DLT_JUNIPER_ES },
268 #endif
269 #ifdef DLT_JUNIPER_MONITOR
270         { juniper_monitor_print, DLT_JUNIPER_MONITOR },
271 #endif
272 #ifdef DLT_JUNIPER_SERVICES
273         { juniper_services_print, DLT_JUNIPER_SERVICES },
274 #endif
275 #ifdef DLT_JUNIPER_ETHER
276         { juniper_ether_print,  DLT_JUNIPER_ETHER },
277 #endif
278 #ifdef DLT_JUNIPER_PPP
279         { juniper_ppp_print,    DLT_JUNIPER_PPP },
280 #endif
281 #ifdef DLT_JUNIPER_FRELAY
282         { juniper_frelay_print, DLT_JUNIPER_FRELAY },
283 #endif
284 #ifdef DLT_JUNIPER_CHDLC
285         { juniper_chdlc_print,  DLT_JUNIPER_CHDLC },
286 #endif
287 #ifdef DLT_MFR
288         { mfr_if_print,         DLT_MFR },
289 #endif
290 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
291         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
292 #endif
293 #ifdef HAVE_PCAP_USB_H
294 #ifdef DLT_USB_LINUX
295         { usb_linux_48_byte_print, DLT_USB_LINUX},
296 #endif /* DLT_USB_LINUX */
297 #ifdef DLT_USB_LINUX_MMAPPED
298         { usb_linux_64_byte_print, DLT_USB_LINUX_MMAPPED},
299 #endif /* DLT_USB_LINUX_MMAPPED */
300 #endif /* HAVE_PCAP_USB_H */
301 #ifdef DLT_IPV4
302         { raw_if_print,         DLT_IPV4 },
303 #endif
304 #ifdef DLT_IPV6
305         { raw_if_print,         DLT_IPV6 },
306 #endif
307         { NULL,                 0 },
308 };
309
310 static struct ndo_printer ndo_printers[] = {
311         { ether_if_print,       DLT_EN10MB },
312 #ifdef DLT_IPNET
313         { ipnet_if_print,       DLT_IPNET },
314 #endif
315 #ifdef DLT_IEEE802_15_4
316         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
317 #endif
318 #ifdef DLT_IEEE802_15_4_NOFCS
319         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
320 #endif
321 #ifdef DLT_PPI
322         { ppi_if_print,         DLT_PPI },
323 #endif
324 #ifdef DLT_NETANALYZER
325         { netanalyzer_if_print, DLT_NETANALYZER },
326 #endif
327 #ifdef DLT_NETANALYZER_TRANSPARENT
328         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
329 #endif
330         { NULL,                 0 },
331 };
332
333 if_printer
334 lookup_printer(int type)
335 {
336         struct printer *p;
337
338         for (p = printers; p->f; ++p)
339                 if (type == p->type)
340                         return p->f;
341
342         return NULL;
343         /* NOTREACHED */
344 }
345
346 if_ndo_printer
347 lookup_ndo_printer(int type)
348 {
349         struct ndo_printer *p;
350
351         for (p = ndo_printers; p->f; ++p)
352                 if (type == p->type)
353                         return p->f;
354
355         return NULL;
356         /* NOTREACHED */
357 }
358
359 static pcap_t *pd;
360
361 static int supports_monitor_mode;
362
363 extern int optind;
364 extern int opterr;
365 extern char *optarg;
366
367 struct print_info {
368         netdissect_options *ndo;
369         union {
370                 if_printer     printer;
371                 if_ndo_printer ndo_printer;
372         } p;
373         int ndo_type;
374 };
375
376 struct dump_info {
377         char    *WFileName;
378         char    *CurrentFileName;
379         pcap_t  *pd;
380         pcap_dumper_t *p;
381 };
382
383 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
384 static void
385 show_tstamp_types_and_exit(const char *device, pcap_t *pd)
386 {
387         int n_tstamp_types;
388         int *tstamp_types = 0;
389         const char *tstamp_type_name;
390         int i;
391
392         n_tstamp_types = pcap_list_tstamp_types(pd, &tstamp_types);
393         if (n_tstamp_types < 0)
394                 error("%s", pcap_geterr(pd));
395
396         if (n_tstamp_types == 0) {
397                 fprintf(stderr, "Time stamp type cannot be set for %s\n",
398                     device);
399                 exit(0);
400         }
401         fprintf(stderr, "Time stamp types for %s (use option -j to set):\n",
402             device);
403         for (i = 0; i < n_tstamp_types; i++) {
404                 tstamp_type_name = pcap_tstamp_type_val_to_name(tstamp_types[i]);
405                 if (tstamp_type_name != NULL) {
406                         (void) fprintf(stderr, "  %s (%s)\n", tstamp_type_name,
407                             pcap_tstamp_type_val_to_description(tstamp_types[i]));
408                 } else {
409                         (void) fprintf(stderr, "  %d\n", tstamp_types[i]);
410                 }
411         }
412         pcap_free_tstamp_types(tstamp_types);
413         exit(0);
414 }
415 #endif
416
417 static void
418 show_dlts_and_exit(const char *device, pcap_t *pd)
419 {
420         int n_dlts;
421         int *dlts = 0;
422         const char *dlt_name;
423
424         n_dlts = pcap_list_datalinks(pd, &dlts);
425         if (n_dlts < 0)
426                 error("%s", pcap_geterr(pd));
427         else if (n_dlts == 0 || !dlts)
428                 error("No data link types.");
429
430         /*
431          * If the interface is known to support monitor mode, indicate
432          * whether these are the data link types available when not in
433          * monitor mode, if -I wasn't specified, or when in monitor mode,
434          * when -I was specified (the link-layer types available in
435          * monitor mode might be different from the ones available when
436          * not in monitor mode).
437          */
438         if (supports_monitor_mode)
439                 (void) fprintf(stderr, "Data link types for %s %s (use option -y to set):\n",
440                     device,
441                     Iflag ? "when in monitor mode" : "when not in monitor mode");
442         else
443                 (void) fprintf(stderr, "Data link types for %s (use option -y to set):\n",
444                     device);
445
446         while (--n_dlts >= 0) {
447                 dlt_name = pcap_datalink_val_to_name(dlts[n_dlts]);
448                 if (dlt_name != NULL) {
449                         (void) fprintf(stderr, "  %s (%s)", dlt_name,
450                             pcap_datalink_val_to_description(dlts[n_dlts]));
451
452                         /*
453                          * OK, does tcpdump handle that type?
454                          */
455                         if (lookup_printer(dlts[n_dlts]) == NULL
456                             && lookup_ndo_printer(dlts[n_dlts]) == NULL)
457                                 (void) fprintf(stderr, " (printing not supported)");
458                         fprintf(stderr, "\n");
459                 } else {
460                         (void) fprintf(stderr, "  DLT %d (printing not supported)\n",
461                             dlts[n_dlts]);
462                 }
463         }
464         pcap_free_datalinks(dlts);
465         exit(0);
466 }
467
468 /*
469  * Set up flags that might or might not be supported depending on the
470  * version of libpcap we're using.
471  */
472 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
473 #define B_FLAG          "B:"
474 #define B_FLAG_USAGE    " [ -B size ]"
475 #else /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
476 #define B_FLAG
477 #define B_FLAG_USAGE
478 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
479
480 #ifdef HAVE_PCAP_CREATE
481 #define I_FLAG          "I"
482 #else /* HAVE_PCAP_CREATE */
483 #define I_FLAG
484 #endif /* HAVE_PCAP_CREATE */
485
486 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
487 #define j_FLAG          "j:"
488 #define j_FLAG_USAGE    " [ -j tstamptype ]"
489 #define J_FLAG          "J"
490 #else /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
491 #define j_FLAG
492 #define j_FLAG_USAGE
493 #define J_FLAG
494 #endif /* PCAP_ERROR_TSTAMP_TYPE_NOTSUP */
495
496 #ifdef HAVE_PCAP_FINDALLDEVS
497 #ifndef HAVE_PCAP_IF_T
498 #undef HAVE_PCAP_FINDALLDEVS
499 #endif
500 #endif
501
502 #ifdef HAVE_PCAP_FINDALLDEVS
503 #define D_FLAG  "D"
504 #else
505 #define D_FLAG
506 #endif
507
508 #ifdef HAVE_PCAP_DUMP_FLUSH
509 #define U_FLAG  "U"
510 #else
511 #define U_FLAG
512 #endif
513
514 #ifndef WIN32
515 /* Drop root privileges and chroot if necessary */
516 static void
517 droproot(const char *username, const char *chroot_dir)
518 {
519         struct passwd *pw = NULL;
520
521         if (chroot_dir && !username) {
522                 fprintf(stderr, "tcpdump: Chroot without dropping root is insecure\n");
523                 exit(1);
524         }
525         
526         pw = getpwnam(username);
527         if (pw) {
528                 if (chroot_dir) {
529                         if (chroot(chroot_dir) != 0 || chdir ("/") != 0) {
530                                 fprintf(stderr, "tcpdump: Couldn't chroot/chdir to '%.64s': %s\n",
531                                     chroot_dir, pcap_strerror(errno));
532                                 exit(1);
533                         }
534                 }
535                 if (initgroups(pw->pw_name, pw->pw_gid) != 0 ||
536                     setgid(pw->pw_gid) != 0 || setuid(pw->pw_uid) != 0) {
537                         fprintf(stderr, "tcpdump: Couldn't change to '%.32s' uid=%lu gid=%lu: %s\n",
538                             username, 
539                             (unsigned long)pw->pw_uid,
540                             (unsigned long)pw->pw_gid,
541                             pcap_strerror(errno));
542                         exit(1);
543                 }
544         }
545         else {
546                 fprintf(stderr, "tcpdump: Couldn't find user '%.32s'\n",
547                     username);
548                 exit(1);
549         }
550 }
551 #endif /* WIN32 */
552
553 static int
554 getWflagChars(int x)
555 {
556         int c = 0;
557
558         x -= 1;
559         while (x > 0) {
560                 c += 1;
561                 x /= 10;
562         }
563
564         return c;
565 }
566
567
568 static void
569 MakeFilename(char *buffer, char *orig_name, int cnt, int max_chars)
570 {
571         char *filename = malloc(NAME_MAX + 1);
572
573         /* Process with strftime if Gflag is set. */
574         if (Gflag != 0) {
575           struct tm *local_tm;
576
577           /* Convert Gflag_time to a usable format */
578           if ((local_tm = localtime(&Gflag_time)) == NULL) {
579                   error("MakeTimedFilename: localtime");
580           }
581
582           /* There's no good way to detect an error in strftime since a return
583            * value of 0 isn't necessarily failure.
584            */
585           strftime(filename, NAME_MAX, orig_name, local_tm);
586         } else {
587           strncpy(filename, orig_name, NAME_MAX);
588         }
589
590         if (cnt == 0 && max_chars == 0)
591                 strncpy(buffer, filename, NAME_MAX + 1);
592         else
593                 if (snprintf(buffer, NAME_MAX + 1, "%s%0*d", filename, max_chars, cnt) > NAME_MAX)
594                   /* Report an error if the filename is too large */
595                   error("too many output files or filename is too long (> %d)", NAME_MAX);
596         free(filename);
597 }
598
599 static int tcpdump_printf(netdissect_options *ndo _U_,
600                           const char *fmt, ...)
601 {
602   
603   va_list args;
604   int ret;
605
606   va_start(args, fmt);
607   ret=vfprintf(stdout, fmt, args);
608   va_end(args);
609
610   return ret;
611 }
612
613 int
614 main(int argc, char **argv)
615 {
616         register int cnt, op, i;
617         bpf_u_int32 localnet, netmask;
618         register char *cp, *infile, *cmdbuf, *device, *RFileName, *WFileName;
619         pcap_handler callback;
620         int type;
621         struct bpf_program fcode;
622 #ifndef WIN32
623         RETSIGTYPE (*oldhandler)(int);
624 #endif
625         struct print_info printinfo;
626         struct dump_info dumpinfo;
627         u_char *pcap_userdata;
628         char ebuf[PCAP_ERRBUF_SIZE];
629         char *username = NULL;
630         char *chroot_dir = NULL;
631 #ifdef HAVE_PCAP_FINDALLDEVS
632         pcap_if_t *devpointer;
633         int devnum;
634 #endif
635         int status;
636 #ifdef WIN32
637         if(wsockinit() != 0) return 1;
638 #endif /* WIN32 */
639
640         jflag=-1;       /* not set */
641         gndo->ndo_Oflag=1;
642         gndo->ndo_Rflag=1;
643         gndo->ndo_dlt=-1;
644         gndo->ndo_default_print=ndo_default_print;
645         gndo->ndo_printf=tcpdump_printf;
646         gndo->ndo_error=ndo_error;
647         gndo->ndo_warning=ndo_warning;
648         gndo->ndo_snaplen = DEFAULT_SNAPLEN;
649   
650         cnt = -1;
651         device = NULL;
652         infile = NULL;
653         RFileName = NULL;
654         WFileName = NULL;
655         if ((cp = strrchr(argv[0], '/')) != NULL)
656                 program_name = cp + 1;
657         else
658                 program_name = argv[0];
659
660         if (abort_on_misalignment(ebuf, sizeof(ebuf)) < 0)
661                 error("%s", ebuf);
662
663 #ifdef LIBSMI
664         smiInit("tcpdump");
665 #endif
666
667         while (
668             (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 "vw:W:xXy:Yz:Z:")) != -1)
669                 switch (op) {
670
671                 case 'a':
672                         /* compatibility for old -a */
673                         break;
674
675                 case 'A':
676                         ++Aflag;
677                         break;
678
679                 case 'b':
680                         ++bflag;
681                         break;
682
683 #if defined(HAVE_PCAP_CREATE) || defined(WIN32)
684                 case 'B':
685                         Bflag = atoi(optarg)*1024;
686                         if (Bflag <= 0)
687                                 error("invalid packet buffer size %s", optarg);
688                         break;
689 #endif /* defined(HAVE_PCAP_CREATE) || defined(WIN32) */
690
691                 case 'c':
692                         cnt = atoi(optarg);
693                         if (cnt <= 0)
694                                 error("invalid packet count %s", optarg);
695                         break;
696
697                 case 'C':
698                         Cflag = atoi(optarg) * 1000000;
699                         if (Cflag < 0)
700                                 error("invalid file size %s", optarg);
701                         break;
702
703                 case 'd':
704                         ++dflag;
705                         break;
706
707 #ifdef HAVE_PCAP_FINDALLDEVS
708                 case 'D':
709                         if (pcap_findalldevs(&devpointer, ebuf) < 0)
710                                 error("%s", ebuf);
711                         else {
712                                 for (i = 0; devpointer != 0; i++) {
713                                         printf("%d.%s", i+1, devpointer->name);
714                                         if (devpointer->description != NULL)
715                                                 printf(" (%s)", devpointer->description);
716                                         printf("\n");
717                                         devpointer = devpointer->next;
718                                 }
719                         }
720                         return 0;
721 #endif /* HAVE_PCAP_FINDALLDEVS */
722
723                 case 'L':
724                         Lflag++;
725                         break;
726
727                 case 'e':
728                         ++eflag;
729                         break;
730
731                 case 'E':
732 #ifndef HAVE_LIBCRYPTO
733                         warning("crypto code not compiled in");
734 #endif
735                         gndo->ndo_espsecret = optarg;
736                         break;
737
738                 case 'f':
739                         ++fflag;
740                         break;
741
742                 case 'F':
743                         infile = optarg;
744                         break;
745
746                 case 'G':
747                         Gflag = atoi(optarg);
748                         if (Gflag < 0)
749                                 error("invalid number of seconds %s", optarg);
750
751                         /* We will create one file initially. */
752                         Gflag_count = 0;
753
754                         /* Grab the current time for rotation use. */
755                         if ((Gflag_time = time(NULL)) == (time_t)-1) {
756                                 error("main: can't get current time: %s",
757                                     pcap_strerror(errno));
758                         }
759                         break;
760
761                 case 'h':
762                         usage();
763                         break;
764
765                 case 'H':
766                         ++Hflag;
767                         break;
768
769                 case 'i':
770                         if (optarg[0] == '0' && optarg[1] == 0)
771                                 error("Invalid adapter index");
772                         
773 #ifdef HAVE_PCAP_FINDALLDEVS
774                         /*
775                          * If the argument is a number, treat it as
776                          * an index into the list of adapters, as
777                          * printed by "tcpdump -D".
778                          *
779                          * This should be OK on UNIX systems, as interfaces
780                          * shouldn't have names that begin with digits.
781                          * It can be useful on Windows, where more than
782                          * one interface can have the same name.
783                          */
784                         if ((devnum = atoi(optarg)) != 0) {
785                                 if (devnum < 0)
786                                         error("Invalid adapter index");
787
788                                 if (pcap_findalldevs(&devpointer, ebuf) < 0)
789                                         error("%s", ebuf);
790                                 else {
791                                         /*
792                                          * Look for the devnum-th entry
793                                          * in the list of devices
794                                          * (1-based).
795                                          */
796                                         for (i = 0;
797                                             i < devnum-1 && devpointer != NULL;
798                                             i++, devpointer = devpointer->next)
799                                                 ;
800                                         if (devpointer == NULL)
801                                                 error("Invalid adapter index");
802                                 }
803                                 device = devpointer->name;
804                                 break;
805                         }
806 #endif /* HAVE_PCAP_FINDALLDEVS */
807                         device = optarg;
808                         break;
809
810 #ifdef HAVE_PCAP_CREATE
811                 case 'I':
812                         ++Iflag;
813                         break;
814 #endif /* HAVE_PCAP_CREATE */
815
816 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
817                 case 'j':
818                         jflag = pcap_tstamp_type_name_to_val(optarg);
819                         if (jflag < 0)
820                                 error("invalid time stamp type %s", optarg);
821                         break;
822
823                 case 'J':
824                         Jflag++;
825                         break;
826 #endif
827
828                 case 'l':
829 #ifdef WIN32
830                         /*
831                          * _IOLBF is the same as _IOFBF in Microsoft's C
832                          * libraries; the only alternative they offer
833                          * is _IONBF.
834                          *
835                          * XXX - this should really be checking for MSVC++,
836                          * not WIN32, if, for example, MinGW has its own
837                          * C library that is more UNIX-compatible.
838                          */
839                         setvbuf(stdout, NULL, _IONBF, 0);
840 #else /* WIN32 */
841 #ifdef HAVE_SETLINEBUF
842                         setlinebuf(stdout);
843 #else
844                         setvbuf(stdout, NULL, _IOLBF, 0);
845 #endif
846 #endif /* WIN32 */
847                         break;
848
849                 case 'K':
850                         ++Kflag;
851                         break;
852
853                 case 'm':
854 #ifdef LIBSMI
855                         if (smiLoadModule(optarg) == 0) {
856                                 error("could not load MIB module %s", optarg);
857                         }
858                         sflag = 1;
859 #else
860                         (void)fprintf(stderr, "%s: ignoring option `-m %s' ",
861                                       program_name, optarg);
862                         (void)fprintf(stderr, "(no libsmi support)\n");
863 #endif
864                         break;
865
866                 case 'M':
867                         /* TCP-MD5 shared secret */
868 #ifndef HAVE_LIBCRYPTO
869                         warning("crypto code not compiled in");
870 #endif
871                         sigsecret = optarg;
872                         break;
873
874                 case 'n':
875                         ++nflag;
876                         break;
877
878                 case 'N':
879                         ++Nflag;
880                         break;
881
882                 case 'O':
883                         Oflag = 0;
884                         break;
885
886                 case 'p':
887                         ++pflag;
888                         break;
889
890                 case 'q':
891                         ++qflag;
892                         ++suppress_default_print;
893                         break;
894
895                 case 'r':
896                         RFileName = optarg;
897                         break;
898
899                 case 'R':
900                         Rflag = 0;
901                         break;
902
903                 case 's': {
904                         char *end;
905
906                         snaplen = strtol(optarg, &end, 0);
907                         if (optarg == end || *end != '\0'
908                             || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
909                                 error("invalid snaplen %s", optarg);
910                         else if (snaplen == 0)
911                                 snaplen = MAXIMUM_SNAPLEN;
912                         break;
913                 }
914
915                 case 'S':
916                         ++Sflag;
917                         break;
918
919                 case 't':
920                         ++tflag;
921                         break;
922
923                 case 'T':
924                         if (strcasecmp(optarg, "vat") == 0)
925                                 packettype = PT_VAT;
926                         else if (strcasecmp(optarg, "wb") == 0)
927                                 packettype = PT_WB;
928                         else if (strcasecmp(optarg, "rpc") == 0)
929                                 packettype = PT_RPC;
930                         else if (strcasecmp(optarg, "rtp") == 0)
931                                 packettype = PT_RTP;
932                         else if (strcasecmp(optarg, "rtcp") == 0)
933                                 packettype = PT_RTCP;
934                         else if (strcasecmp(optarg, "snmp") == 0)
935                                 packettype = PT_SNMP;
936                         else if (strcasecmp(optarg, "cnfp") == 0)
937                                 packettype = PT_CNFP;
938                         else if (strcasecmp(optarg, "tftp") == 0)
939                                 packettype = PT_TFTP;
940                         else if (strcasecmp(optarg, "aodv") == 0)
941                                 packettype = PT_AODV;
942                         else if (strcasecmp(optarg, "carp") == 0)
943                                 packettype = PT_CARP;
944                         else
945                                 error("unknown packet type `%s'", optarg);
946                         break;
947
948                 case 'u':
949                         ++uflag;
950                         break;
951
952 #ifdef HAVE_PCAP_DUMP_FLUSH
953                 case 'U':
954                         ++Uflag;
955                         break;
956 #endif
957
958                 case 'v':
959                         ++vflag;
960                         break;
961
962                 case 'w':
963                         WFileName = optarg;
964                         break;
965
966                 case 'W':
967                         Wflag = atoi(optarg);
968                         if (Wflag < 0) 
969                                 error("invalid number of output files %s", optarg);
970                         WflagChars = getWflagChars(Wflag);
971                         break;
972
973                 case 'x':
974                         ++xflag;
975                         ++suppress_default_print;
976                         break;
977
978                 case 'X':
979                         ++Xflag;
980                         ++suppress_default_print;
981                         break;
982
983                 case 'y':
984                         gndo->ndo_dltname = optarg;
985                         gndo->ndo_dlt =
986                           pcap_datalink_name_to_val(gndo->ndo_dltname);
987                         if (gndo->ndo_dlt < 0)
988                                 error("invalid data link type %s", gndo->ndo_dltname);
989                         break;
990
991 #if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
992                 case 'Y':
993                         {
994                         /* Undocumented flag */
995 #ifdef HAVE_PCAP_DEBUG
996                         extern int pcap_debug;
997                         pcap_debug = 1;
998 #else
999                         extern int yydebug;
1000                         yydebug = 1;
1001 #endif
1002                         }
1003                         break;
1004 #endif
1005                 case 'z':
1006                         if (optarg) {
1007                                 zflag = strdup(optarg);
1008                         } else {
1009                                 usage();
1010                                 /* NOTREACHED */
1011                         }
1012                         break;
1013
1014                 case 'Z':
1015                         if (optarg) {
1016                                 username = strdup(optarg);
1017                         }
1018                         else {
1019                                 usage();
1020                                 /* NOTREACHED */
1021                         }
1022                         break;
1023
1024                 default:
1025                         usage();
1026                         /* NOTREACHED */
1027                 }
1028
1029         switch (tflag) {
1030
1031         case 0: /* Default */
1032         case 4: /* Default + Date*/
1033                 thiszone = gmt2local(0);
1034                 break;
1035
1036         case 1: /* No time stamp */
1037         case 2: /* Unix timeval style */
1038         case 3: /* Microseconds since previous packet */
1039         case 5: /* Microseconds since first packet */
1040                 break;
1041
1042         default: /* Not supported */
1043                 error("only -t, -tt, -ttt, -tttt and -ttttt are supported");
1044                 break;
1045         }
1046
1047 #ifdef WITH_CHROOT
1048         /* if run as root, prepare for chrooting */
1049         if (getuid() == 0 || geteuid() == 0) {
1050                 /* future extensibility for cmd-line arguments */
1051                 if (!chroot_dir)
1052                         chroot_dir = WITH_CHROOT;
1053         }
1054 #endif
1055
1056 #ifdef WITH_USER
1057         /* if run as root, prepare for dropping root privileges */
1058         if (getuid() == 0 || geteuid() == 0) {
1059                 /* Run with '-Z root' to restore old behaviour */ 
1060                 if (!username)
1061                         username = WITH_USER;
1062         }
1063 #endif
1064
1065         if (RFileName != NULL) {
1066                 int dlt;
1067                 const char *dlt_name;
1068
1069 #ifndef WIN32
1070                 /*
1071                  * We don't need network access, so relinquish any set-UID
1072                  * or set-GID privileges we have (if any).
1073                  *
1074                  * We do *not* want set-UID privileges when opening a
1075                  * trace file, as that might let the user read other
1076                  * people's trace files (especially if we're set-UID
1077                  * root).
1078                  */
1079                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0 )
1080                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
1081 #endif /* WIN32 */
1082                 pd = pcap_open_offline(RFileName, ebuf);
1083                 if (pd == NULL)
1084                         error("%s", ebuf);
1085                 dlt = pcap_datalink(pd);
1086                 dlt_name = pcap_datalink_val_to_name(dlt);
1087                 if (dlt_name == NULL) {
1088                         fprintf(stderr, "reading from file %s, link-type %u\n",
1089                             RFileName, dlt);
1090                 } else {
1091                         fprintf(stderr,
1092                             "reading from file %s, link-type %s (%s)\n",
1093                             RFileName, dlt_name,
1094                             pcap_datalink_val_to_description(dlt));
1095                 }
1096                 localnet = 0;
1097                 netmask = 0;
1098                 if (fflag != 0)
1099                         error("-f and -r options are incompatible");
1100         } else {
1101                 if (device == NULL) {
1102                         device = pcap_lookupdev(ebuf);
1103                         if (device == NULL)
1104                                 error("%s", ebuf);
1105                 }
1106 #ifdef WIN32
1107                 if(strlen(device) == 1) //we assume that an ASCII string is always longer than 1 char
1108                 {                                               //a Unicode string has a \0 as second byte (so strlen() is 1)
1109                         fprintf(stderr, "%s: listening on %ws\n", program_name, device);
1110                 }
1111                 else
1112                 {
1113                         fprintf(stderr, "%s: listening on %s\n", program_name, device);
1114                 }
1115
1116                 fflush(stderr); 
1117 #endif /* WIN32 */
1118 #ifdef HAVE_PCAP_CREATE
1119                 pd = pcap_create(device, ebuf);
1120                 if (pd == NULL)
1121                         error("%s", ebuf);
1122 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1123                 if (Jflag)
1124                         show_tstamp_types_and_exit(device, pd);
1125 #endif
1126                 /*
1127                  * Is this an interface that supports monitor mode?
1128                  */
1129                 if (pcap_can_set_rfmon(pd) == 1)
1130                         supports_monitor_mode = 1;
1131                 else
1132                         supports_monitor_mode = 0;
1133                 status = pcap_set_snaplen(pd, snaplen);
1134                 if (status != 0)
1135                         error("%s: Can't set snapshot length: %s",
1136                             device, pcap_statustostr(status));
1137                 status = pcap_set_promisc(pd, !pflag);
1138                 if (status != 0)
1139                         error("%s: Can't set promiscuous mode: %s",
1140                             device, pcap_statustostr(status));
1141                 if (Iflag) {
1142                         status = pcap_set_rfmon(pd, 1);
1143                         if (status != 0)
1144                                 error("%s: Can't set monitor mode: %s",
1145                                     device, pcap_statustostr(status));
1146                 }
1147                 status = pcap_set_timeout(pd, 1000);
1148                 if (status != 0)
1149                         error("%s: pcap_set_timeout failed: %s",
1150                             device, pcap_statustostr(status));
1151                 if (Bflag != 0) {
1152                         status = pcap_set_buffer_size(pd, Bflag);
1153                         if (status != 0)
1154                                 error("%s: Can't set buffer size: %s",
1155                                     device, pcap_statustostr(status));
1156                 }
1157 #ifdef HAVE_PCAP_SET_TSTAMP_TYPE
1158                 if (jflag != -1) {
1159                         status = pcap_set_tstamp_type(pd, jflag);
1160                         if (status < 0)
1161                                 error("%s: Can't set time stamp type: %s",
1162                                     device, pcap_statustostr(status));
1163                 }
1164 #endif
1165                 status = pcap_activate(pd);
1166                 if (status < 0) {
1167                         /*
1168                          * pcap_activate() failed.
1169                          */
1170                         cp = pcap_geterr(pd);
1171                         if (status == PCAP_ERROR)
1172                                 error("%s", cp);
1173                         else if ((status == PCAP_ERROR_NO_SUCH_DEVICE ||
1174                                   status == PCAP_ERROR_PERM_DENIED) &&
1175                                  *cp != '\0')
1176                                 error("%s: %s\n(%s)", device,
1177                                     pcap_statustostr(status), cp);
1178                         else
1179                                 error("%s: %s", device,
1180                                     pcap_statustostr(status));
1181                 } else if (status > 0) {
1182                         /*
1183                          * pcap_activate() succeeded, but it's warning us
1184                          * of a problem it had.
1185                          */
1186                         cp = pcap_geterr(pd);
1187                         if (status == PCAP_WARNING)
1188                                 warning("%s", cp);
1189                         else if (status == PCAP_WARNING_PROMISC_NOTSUP &&
1190                                  *cp != '\0')
1191                                 warning("%s: %s\n(%s)", device,
1192                                     pcap_statustostr(status), cp);
1193                         else
1194                                 warning("%s: %s", device,
1195                                     pcap_statustostr(status));
1196                 }
1197 #else
1198                 *ebuf = '\0';
1199                 pd = pcap_open_live(device, snaplen, !pflag, 1000, ebuf);
1200                 if (pd == NULL)
1201                         error("%s", ebuf);
1202                 else if (*ebuf)
1203                         warning("%s", ebuf);
1204 #endif /* HAVE_PCAP_CREATE */
1205                 /*
1206                  * Let user own process after socket has been opened.
1207                  */
1208 #ifndef WIN32
1209                 if (setgid(getgid()) != 0 || setuid(getuid()) != 0)
1210                         fprintf(stderr, "Warning: setgid/setuid failed !\n");
1211 #endif /* WIN32 */
1212 #if !defined(HAVE_PCAP_CREATE) && defined(WIN32)
1213                 if(Bflag != 0)
1214                         if(pcap_setbuff(pd, Bflag)==-1){
1215                                 error("%s", pcap_geterr(pd));
1216                         }
1217 #endif /* !defined(HAVE_PCAP_CREATE) && defined(WIN32) */
1218                 if (Lflag)
1219                         show_dlts_and_exit(device, pd);
1220                 if (gndo->ndo_dlt >= 0) {
1221 #ifdef HAVE_PCAP_SET_DATALINK
1222                         if (pcap_set_datalink(pd, gndo->ndo_dlt) < 0)
1223                                 error("%s", pcap_geterr(pd));
1224 #else
1225                         /*
1226                          * We don't actually support changing the
1227                          * data link type, so we only let them
1228                          * set it to what it already is.
1229                          */
1230                         if (gndo->ndo_dlt != pcap_datalink(pd)) {
1231                                 error("%s is not one of the DLTs supported by this device\n",
1232                                       gndo->ndo_dltname);
1233                         }
1234 #endif
1235                         (void)fprintf(stderr, "%s: data link type %s\n",
1236                                       program_name, gndo->ndo_dltname);
1237                         (void)fflush(stderr);
1238                 }
1239                 i = pcap_snapshot(pd);
1240                 if (snaplen < i) {
1241                         warning("snaplen raised from %d to %d", snaplen, i);
1242                         snaplen = i;
1243                 }
1244                 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
1245                         localnet = 0;
1246                         netmask = 0;
1247                         warning("%s", ebuf);
1248                 }
1249         }
1250         if (infile)
1251                 cmdbuf = read_infile(infile);
1252         else
1253                 cmdbuf = copy_argv(&argv[optind]);
1254
1255         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
1256                 error("%s", pcap_geterr(pd));
1257         free(cmdbuf);
1258         if (dflag) {
1259                 bpf_dump(&fcode, dflag);
1260                 pcap_close(pd);
1261                 exit(0);
1262         }
1263         init_addrtoname(localnet, netmask);
1264         init_checksum();
1265
1266 #ifndef WIN32   
1267         (void)setsignal(SIGPIPE, cleanup);
1268         (void)setsignal(SIGTERM, cleanup);
1269         (void)setsignal(SIGINT, cleanup);
1270 #endif /* WIN32 */
1271 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1272         (void)setsignal(SIGCHLD, child_cleanup);
1273 #endif
1274         /* Cooperate with nohup(1) */
1275 #ifndef WIN32   
1276         if ((oldhandler = setsignal(SIGHUP, cleanup)) != SIG_DFL)
1277                 (void)setsignal(SIGHUP, oldhandler);
1278 #endif /* WIN32 */
1279
1280 #ifndef WIN32
1281         /*
1282          * If a user name was specified with "-Z", attempt to switch to
1283          * that user's UID.  This would probably be used with sudo,
1284          * to allow tcpdump to be run in a special restricted
1285          * account (if you just want to allow users to open capture
1286          * devices, and can't just give users that permission,
1287          * you'd make tcpdump set-UID or set-GID).
1288          *
1289          * Tcpdump doesn't necessarily write only to one savefile;
1290          * the general only way to allow a -Z instance to write to
1291          * savefiles as the user under whose UID it's run, rather
1292          * than as the user specified with -Z, would thus be to switch
1293          * to the original user ID before opening a capture file and
1294          * then switch back to the -Z user ID after opening the savefile.
1295          * Switching to the -Z user ID only after opening the first
1296          * savefile doesn't handle the general case.
1297          */
1298         if (getuid() == 0 || geteuid() == 0) {
1299                 if (username || chroot_dir)
1300                         droproot(username, chroot_dir);
1301         }
1302 #endif /* WIN32 */
1303
1304         if (pcap_setfilter(pd, &fcode) < 0)
1305                 error("%s", pcap_geterr(pd));
1306         if (WFileName) {
1307                 pcap_dumper_t *p;
1308                 /* Do not exceed the default NAME_MAX for files. */
1309                 dumpinfo.CurrentFileName = (char *)malloc(NAME_MAX + 1);
1310
1311                 if (dumpinfo.CurrentFileName == NULL)
1312                         error("malloc of dumpinfo.CurrentFileName");
1313
1314                 /* We do not need numbering for dumpfiles if Cflag isn't set. */
1315                 if (Cflag != 0)
1316                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, WflagChars);
1317                 else
1318                   MakeFilename(dumpinfo.CurrentFileName, WFileName, 0, 0);
1319
1320                 p = pcap_dump_open(pd, dumpinfo.CurrentFileName);
1321                 if (p == NULL)
1322                         error("%s", pcap_geterr(pd));
1323                 if (Cflag != 0 || Gflag != 0) {
1324                         callback = dump_packet_and_trunc;
1325                         dumpinfo.WFileName = WFileName;
1326                         dumpinfo.pd = pd;
1327                         dumpinfo.p = p;
1328                         pcap_userdata = (u_char *)&dumpinfo;
1329                 } else {
1330                         callback = dump_packet;
1331                         pcap_userdata = (u_char *)p;
1332                 }
1333 #ifdef HAVE_PCAP_DUMP_FLUSH
1334                 if (Uflag)
1335                         pcap_dump_flush(p);
1336 #endif
1337         } else {
1338                 type = pcap_datalink(pd);
1339                 printinfo.ndo_type = 1;
1340                 printinfo.ndo = gndo;
1341                 printinfo.p.ndo_printer = lookup_ndo_printer(type);
1342                 if (printinfo.p.ndo_printer == NULL) {
1343                         printinfo.p.printer = lookup_printer(type);
1344                         printinfo.ndo_type = 0;
1345                         if (printinfo.p.printer == NULL) {
1346                                 gndo->ndo_dltname = pcap_datalink_val_to_name(type);
1347                                 if (gndo->ndo_dltname != NULL)
1348                                         error("packet printing is not supported for link type %s: use -w",
1349                                               gndo->ndo_dltname);
1350                                 else
1351                                         error("packet printing is not supported for link type %d: use -w", type);
1352                         }
1353                 }
1354                 callback = print_packet;
1355                 pcap_userdata = (u_char *)&printinfo;
1356         }
1357
1358 #ifdef SIGNAL_REQ_INFO
1359         /*
1360          * We can't get statistics when reading from a file rather
1361          * than capturing from a device.
1362          */
1363         if (RFileName == NULL)
1364                 (void)setsignal(SIGNAL_REQ_INFO, requestinfo);
1365 #endif
1366
1367         if (vflag > 0 && WFileName) {
1368                 /*
1369                  * When capturing to a file, "-v" means tcpdump should,
1370                  * every 10 secodns, "v"erbosely report the number of
1371                  * packets captured.
1372                  */
1373 #ifdef USE_WIN32_MM_TIMER
1374                 /* call verbose_stats_dump() each 1000 +/-100msec */
1375                 timer_id = timeSetEvent(1000, 100, verbose_stats_dump, 0, TIME_PERIODIC);
1376                 setvbuf(stderr, NULL, _IONBF, 0);
1377 #elif defined(HAVE_ALARM)
1378                 (void)setsignal(SIGALRM, verbose_stats_dump);
1379                 alarm(1);
1380 #endif
1381         }
1382
1383 #ifndef WIN32
1384         if (RFileName == NULL) {
1385                 int dlt;
1386                 const char *dlt_name;
1387
1388                 if (!vflag && !WFileName) {
1389                         (void)fprintf(stderr,
1390                             "%s: verbose output suppressed, use -v or -vv for full protocol decode\n",
1391                             program_name);
1392                 } else
1393                         (void)fprintf(stderr, "%s: ", program_name);
1394                 dlt = pcap_datalink(pd);
1395                 dlt_name = pcap_datalink_val_to_name(dlt);
1396                 if (dlt_name == NULL) {
1397                         (void)fprintf(stderr, "listening on %s, link-type %u, capture size %u bytes\n",
1398                             device, dlt, snaplen);
1399                 } else {
1400                         (void)fprintf(stderr, "listening on %s, link-type %s (%s), capture size %u bytes\n",
1401                             device, dlt_name,
1402                             pcap_datalink_val_to_description(dlt), snaplen);
1403                 }
1404                 (void)fflush(stderr);
1405         }
1406 #endif /* WIN32 */
1407         status = pcap_loop(pd, cnt, callback, pcap_userdata);
1408         if (WFileName == NULL) {
1409                 /*
1410                  * We're printing packets.  Flush the printed output,
1411                  * so it doesn't get intermingled with error output.
1412                  */
1413                 if (status == -2) {
1414                         /*
1415                          * We got interrupted, so perhaps we didn't
1416                          * manage to finish a line we were printing.
1417                          * Print an extra newline, just in case.
1418                          */
1419                         putchar('\n');
1420                 }
1421                 (void)fflush(stdout);
1422         }
1423         if (status == -1) {
1424                 /*
1425                  * Error.  Report it.
1426                  */
1427                 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
1428                     program_name, pcap_geterr(pd));
1429         }
1430         if (RFileName == NULL) {
1431                 /*
1432                  * We're doing a live capture.  Report the capture
1433                  * statistics.
1434                  */
1435                 info(1);
1436         }
1437         pcap_close(pd);
1438         exit(status == -1 ? 1 : 0);
1439 }
1440
1441 /* make a clean exit on interrupts */
1442 static RETSIGTYPE
1443 cleanup(int signo _U_)
1444 {
1445 #ifdef USE_WIN32_MM_TIMER
1446         if (timer_id)
1447                 timeKillEvent(timer_id);
1448         timer_id = 0;
1449 #elif defined(HAVE_ALARM)
1450         alarm(0);
1451 #endif
1452
1453 #ifdef HAVE_PCAP_BREAKLOOP
1454         /*
1455          * We have "pcap_breakloop()"; use it, so that we do as little
1456          * as possible in the signal handler (it's probably not safe
1457          * to do anything with standard I/O streams in a signal handler -
1458          * the ANSI C standard doesn't say it is).
1459          */
1460         pcap_breakloop(pd);
1461 #else
1462         /*
1463          * We don't have "pcap_breakloop()"; this isn't safe, but
1464          * it's the best we can do.  Print the summary if we're
1465          * not reading from a savefile - i.e., if we're doing a
1466          * live capture - and exit.
1467          */
1468         if (pd != NULL && pcap_file(pd) == NULL) {
1469                 /*
1470                  * We got interrupted, so perhaps we didn't
1471                  * manage to finish a line we were printing.
1472                  * Print an extra newline, just in case.
1473                  */
1474                 putchar('\n');
1475                 (void)fflush(stdout);
1476                 info(1);
1477         }
1478         exit(0);
1479 #endif
1480 }
1481
1482 /*
1483   On windows, we do not use a fork, so we do not care less about
1484   waiting a child processes to die
1485  */
1486 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1487 static RETSIGTYPE
1488 child_cleanup(int signo _U_)
1489 {
1490   wait(NULL);
1491 }
1492 #endif /* HAVE_FORK && HAVE_VFORK */
1493
1494 static void
1495 info(register int verbose)
1496 {
1497         struct pcap_stat stat;
1498
1499         /*
1500          * Older versions of libpcap didn't set ps_ifdrop on some
1501          * platforms; initialize it to 0 to handle that.
1502          */
1503         stat.ps_ifdrop = 0;
1504         if (pcap_stats(pd, &stat) < 0) {
1505                 (void)fprintf(stderr, "pcap_stats: %s\n", pcap_geterr(pd));
1506                 infoprint = 0;
1507                 return;
1508         }
1509
1510         if (!verbose)
1511                 fprintf(stderr, "%s: ", program_name);
1512
1513         (void)fprintf(stderr, "%u packet%s captured", packets_captured,
1514             PLURAL_SUFFIX(packets_captured));
1515         if (!verbose)
1516                 fputs(", ", stderr);
1517         else
1518                 putc('\n', stderr);
1519         (void)fprintf(stderr, "%u packet%s received by filter", stat.ps_recv,
1520             PLURAL_SUFFIX(stat.ps_recv));
1521         if (!verbose)
1522                 fputs(", ", stderr);
1523         else
1524                 putc('\n', stderr);
1525         (void)fprintf(stderr, "%u packet%s dropped by kernel", stat.ps_drop,
1526             PLURAL_SUFFIX(stat.ps_drop));
1527         if (stat.ps_ifdrop != 0) {
1528                 if (!verbose)
1529                         fputs(", ", stderr);
1530                 else
1531                         putc('\n', stderr);
1532                 (void)fprintf(stderr, "%u packet%s dropped by interface\n",
1533                     stat.ps_ifdrop, PLURAL_SUFFIX(stat.ps_ifdrop));
1534         } else
1535                 putc('\n', stderr);
1536         infoprint = 0;
1537 }
1538
1539 #if defined(HAVE_FORK) || defined(HAVE_VFORK)
1540 static void
1541 compress_savefile(const char *filename)
1542 {
1543 # ifdef HAVE_FORK
1544         if (fork())
1545 # else
1546         if (vfork())
1547 # endif
1548                 return;
1549         /*
1550          * Set to lowest priority so that this doesn't disturb the capture
1551          */
1552 #ifdef NZERO
1553         setpriority(PRIO_PROCESS, 0, NZERO - 1);
1554 #else
1555         setpriority(PRIO_PROCESS, 0, 19);
1556 #endif
1557         if (execlp(zflag, zflag, filename, (char *)NULL) == -1)
1558                 fprintf(stderr,
1559                         "compress_savefile:execlp(%s, %s): %s\n",
1560                         zflag,
1561                         filename,
1562                         strerror(errno));
1563 # ifdef HAVE_FORK
1564         exit(1);
1565 # else
1566         _exit(1);
1567 # endif
1568 }
1569 #else  /* HAVE_FORK && HAVE_VFORK */
1570 static void
1571 compress_savefile(const char *filename)
1572 {
1573         fprintf(stderr,
1574                 "compress_savefile failed. Functionality not implemented under your system\n");
1575 }
1576 #endif /* HAVE_FORK && HAVE_VFORK */
1577
1578 static void
1579 dump_packet_and_trunc(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1580 {
1581         struct dump_info *dump_info;
1582
1583         ++packets_captured;
1584
1585         ++infodelay;
1586
1587         dump_info = (struct dump_info *)user;
1588
1589         /*
1590          * XXX - this won't force the file to rotate on the specified time
1591          * boundary, but it will rotate on the first packet received after the
1592          * specified Gflag number of seconds. Note: if a Gflag time boundary
1593          * and a Cflag size boundary coincide, the time rotation will occur
1594          * first thereby cancelling the Cflag boundary (since the file should
1595          * be 0).
1596          */
1597         if (Gflag != 0) {
1598                 /* Check if it is time to rotate */
1599                 time_t t;
1600
1601                 /* Get the current time */
1602                 if ((t = time(NULL)) == (time_t)-1) {
1603                         error("dump_and_trunc_packet: can't get current_time: %s",
1604                             pcap_strerror(errno));
1605                 }
1606
1607
1608                 /* If the time is greater than the specified window, rotate */
1609                 if (t - Gflag_time >= Gflag) {
1610                         /* Update the Gflag_time */
1611                         Gflag_time = t;
1612                         /* Update Gflag_count */
1613                         Gflag_count++;
1614                         /*
1615                          * Close the current file and open a new one.
1616                          */
1617                         pcap_dump_close(dump_info->p);
1618
1619                         /*
1620                          * Compress the file we just closed, if the user asked for it
1621                          */
1622                         if (zflag != NULL)
1623                                 compress_savefile(dump_info->CurrentFileName);
1624
1625                         /*
1626                          * Check to see if we've exceeded the Wflag (when
1627                          * not using Cflag).
1628                          */
1629                         if (Cflag == 0 && Wflag > 0 && Gflag_count >= Wflag) {
1630                                 (void)fprintf(stderr, "Maximum file limit reached: %d\n",
1631                                     Wflag);
1632                                 exit(0);
1633                                 /* NOTREACHED */
1634                         }
1635                         if (dump_info->CurrentFileName != NULL)
1636                                 free(dump_info->CurrentFileName);
1637                         /* Allocate space for max filename + \0. */
1638                         dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1639                         if (dump_info->CurrentFileName == NULL)
1640                                 error("dump_packet_and_trunc: malloc");
1641                         /*
1642                          * This is always the first file in the Cflag
1643                          * rotation: e.g. 0
1644                          * We also don't need numbering if Cflag is not set.
1645                          */
1646                         if (Cflag != 0)
1647                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0,
1648                                     WflagChars);
1649                         else
1650                                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, 0, 0);
1651
1652                         dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1653                         if (dump_info->p == NULL)
1654                                 error("%s", pcap_geterr(pd));
1655                 }
1656         }
1657
1658         /*
1659          * XXX - this won't prevent capture files from getting
1660          * larger than Cflag - the last packet written to the
1661          * file could put it over Cflag.
1662          */
1663         if (Cflag != 0 && pcap_dump_ftell(dump_info->p) > Cflag) {
1664                 /*
1665                  * Close the current file and open a new one.
1666                  */
1667                 pcap_dump_close(dump_info->p);
1668
1669                 /*
1670                  * Compress the file we just closed, if the user asked for it
1671                  */
1672                 if (zflag != NULL)
1673                         compress_savefile(dump_info->CurrentFileName);
1674
1675                 Cflag_count++;
1676                 if (Wflag > 0) {
1677                         if (Cflag_count >= Wflag)
1678                                 Cflag_count = 0;
1679                 }
1680                 if (dump_info->CurrentFileName != NULL)
1681                         free(dump_info->CurrentFileName);
1682                 dump_info->CurrentFileName = (char *)malloc(NAME_MAX + 1);
1683                 if (dump_info->CurrentFileName == NULL)
1684                         error("dump_packet_and_trunc: malloc");
1685                 MakeFilename(dump_info->CurrentFileName, dump_info->WFileName, Cflag_count, WflagChars);
1686                 dump_info->p = pcap_dump_open(dump_info->pd, dump_info->CurrentFileName);
1687                 if (dump_info->p == NULL)
1688                         error("%s", pcap_geterr(pd));
1689         }
1690
1691         pcap_dump((u_char *)dump_info->p, h, sp);
1692 #ifdef HAVE_PCAP_DUMP_FLUSH
1693         if (Uflag)
1694                 pcap_dump_flush(dump_info->p);
1695 #endif
1696
1697         --infodelay;
1698         if (infoprint)
1699                 info(0);
1700 }
1701
1702 static void
1703 dump_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1704 {
1705         ++packets_captured;
1706
1707         ++infodelay;
1708
1709         pcap_dump(user, h, sp);
1710 #ifdef HAVE_PCAP_DUMP_FLUSH
1711         if (Uflag)
1712                 pcap_dump_flush((pcap_dumper_t *)user);
1713 #endif
1714
1715         --infodelay;
1716         if (infoprint)
1717                 info(0);
1718 }
1719
1720 static void
1721 print_packet(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
1722 {
1723         struct print_info *print_info;
1724         u_int hdrlen;
1725
1726         ++packets_captured;
1727
1728         ++infodelay;
1729         ts_print(&h->ts);
1730
1731         print_info = (struct print_info *)user;
1732
1733         /*
1734          * Some printers want to check that they're not walking off the
1735          * end of the packet.
1736          * Rather than pass it all the way down, we set this global.
1737          */
1738         snapend = sp + h->caplen;
1739
1740         if(print_info->ndo_type) {
1741                 hdrlen = (*print_info->p.ndo_printer)(print_info->ndo, h, sp);
1742         } else {
1743                 hdrlen = (*print_info->p.printer)(h, sp);
1744         }
1745                 
1746         if (Xflag) {
1747                 /*
1748                  * Print the raw packet data in hex and ASCII.
1749                  */
1750                 if (Xflag > 1) {
1751                         /*
1752                          * Include the link-layer header.
1753                          */
1754                         hex_and_ascii_print("\n\t", sp, h->caplen);
1755                 } else {
1756                         /*
1757                          * Don't include the link-layer header - and if
1758                          * we have nothing past the link-layer header,
1759                          * print nothing.
1760                          */
1761                         if (h->caplen > hdrlen)
1762                                 hex_and_ascii_print("\n\t", sp + hdrlen,
1763                                     h->caplen - hdrlen);
1764                 }
1765         } else if (xflag) {
1766                 /*
1767                  * Print the raw packet data in hex.
1768                  */
1769                 if (xflag > 1) {
1770                         /*
1771                          * Include the link-layer header.
1772                          */
1773                         hex_print("\n\t", sp, h->caplen);
1774                 } else {
1775                         /*
1776                          * Don't include the link-layer header - and if
1777                          * we have nothing past the link-layer header,
1778                          * print nothing.
1779                          */
1780                         if (h->caplen > hdrlen)
1781                                 hex_print("\n\t", sp + hdrlen,
1782                                     h->caplen - hdrlen);
1783                 }
1784         } else if (Aflag) {
1785                 /*
1786                  * Print the raw packet data in ASCII.
1787                  */
1788                 if (Aflag > 1) {
1789                         /*
1790                          * Include the link-layer header.
1791                          */
1792                         ascii_print(sp, h->caplen);
1793                 } else {
1794                         /*
1795                          * Don't include the link-layer header - and if
1796                          * we have nothing past the link-layer header,
1797                          * print nothing.
1798                          */
1799                         if (h->caplen > hdrlen)
1800                                 ascii_print(sp + hdrlen, h->caplen - hdrlen);
1801                 }
1802         }
1803
1804         putchar('\n');
1805
1806         --infodelay;
1807         if (infoprint)
1808                 info(0);
1809 }
1810
1811 #ifdef WIN32
1812         /*
1813          * XXX - there should really be libpcap calls to get the version
1814          * number as a string (the string would be generated from #defines
1815          * at run time, so that it's not generated from string constants
1816          * in the library, as, on many UNIX systems, those constants would
1817          * be statically linked into the application executable image, and
1818          * would thus reflect the version of libpcap on the system on
1819          * which the application was *linked*, not the system on which it's
1820          * *running*.
1821          *
1822          * That routine should be documented, unlike the "version[]"
1823          * string, so that UNIX vendors providing their own libpcaps
1824          * don't omit it (as a couple of vendors have...).
1825          *
1826          * Packet.dll should perhaps also export a routine to return the
1827          * version number of the Packet.dll code, to supply the
1828          * "Wpcap_version" information on Windows.
1829          */
1830         char WDversion[]="current-cvs.tcpdump.org";
1831 #if !defined(HAVE_GENERATED_VERSION)
1832         char version[]="current-cvs.tcpdump.org";
1833 #endif
1834         char pcap_version[]="current-cvs.tcpdump.org";
1835         char Wpcap_version[]="3.1";
1836 #endif
1837
1838 /*
1839  * By default, print the specified data out in hex and ASCII.
1840  */
1841 static void
1842 ndo_default_print(netdissect_options *ndo _U_, const u_char *bp, u_int length)
1843 {
1844         hex_and_ascii_print("\n\t", bp, length); /* pass on lf and identation string */
1845 }
1846
1847 void
1848 default_print(const u_char *bp, u_int length)
1849 {
1850         ndo_default_print(gndo, bp, length);
1851 }
1852
1853 #ifdef SIGNAL_REQ_INFO
1854 RETSIGTYPE requestinfo(int signo _U_)
1855 {
1856         if (infodelay)
1857                 ++infoprint;
1858         else
1859                 info(0);
1860 }
1861 #endif
1862
1863 /*
1864  * Called once each second in verbose mode while dumping to file
1865  */
1866 #ifdef USE_WIN32_MM_TIMER
1867 void CALLBACK verbose_stats_dump (UINT timer_id _U_, UINT msg _U_, DWORD_PTR arg _U_,
1868                                   DWORD_PTR dw1 _U_, DWORD_PTR dw2 _U_)
1869 {
1870         struct pcap_stat stat;
1871
1872         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1873                 fprintf(stderr, "Got %u\r", packets_captured);
1874 }
1875 #elif defined(HAVE_ALARM)
1876 static void verbose_stats_dump(int sig _U_)
1877 {
1878         struct pcap_stat stat;
1879
1880         if (infodelay == 0 && pcap_stats(pd, &stat) >= 0)
1881                 fprintf(stderr, "Got %u\r", packets_captured);
1882         alarm(1);
1883 }
1884 #endif
1885
1886 static void
1887 usage(void)
1888 {
1889         extern char version[];
1890 #ifndef HAVE_PCAP_LIB_VERSION
1891 #if defined(WIN32) || defined(HAVE_PCAP_VERSION)
1892         extern char pcap_version[];
1893 #else /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1894         static char pcap_version[] = "unknown";
1895 #endif /* defined(WIN32) || defined(HAVE_PCAP_VERSION) */
1896 #endif /* HAVE_PCAP_LIB_VERSION */
1897
1898 #ifdef HAVE_PCAP_LIB_VERSION
1899 #ifdef WIN32
1900         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1901 #else /* WIN32 */
1902         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1903 #endif /* WIN32 */
1904         (void)fprintf(stderr, "%s\n",pcap_lib_version());
1905 #else /* HAVE_PCAP_LIB_VERSION */
1906 #ifdef WIN32
1907         (void)fprintf(stderr, "%s version %s, based on tcpdump version %s\n", program_name, WDversion, version);
1908         (void)fprintf(stderr, "WinPcap version %s, based on libpcap version %s\n",Wpcap_version, pcap_version);
1909 #else /* WIN32 */
1910         (void)fprintf(stderr, "%s version %s\n", program_name, version);
1911         (void)fprintf(stderr, "libpcap version %s\n", pcap_version);
1912 #endif /* WIN32 */
1913 #endif /* HAVE_PCAP_LIB_VERSION */
1914         (void)fprintf(stderr,
1915 "Usage: %s [-aAbd" D_FLAG "efhH" I_FLAG J_FLAG "KlLnNOpqRStu" U_FLAG "vxX]" B_FLAG_USAGE " [ -c count ]\n", program_name);
1916         (void)fprintf(stderr,
1917 "\t\t[ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]\n");
1918         (void)fprintf(stderr,
1919 "\t\t[ -i interface ]" j_FLAG_USAGE " [ -M secret ]\n");
1920         (void)fprintf(stderr,
1921 "\t\t[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]\n");
1922         (void)fprintf(stderr,
1923 "\t\t[ -W filecount ] [ -y datalinktype ] [ -z command ]\n");
1924         (void)fprintf(stderr,
1925 "\t\t[ -Z user ] [ expression ]\n");
1926         exit(1);
1927 }
1928
1929
1930
1931 /* VARARGS */
1932 static void
1933 ndo_error(netdissect_options *ndo _U_, const char *fmt, ...)
1934 {
1935         va_list ap;
1936
1937         (void)fprintf(stderr, "%s: ", program_name);
1938         va_start(ap, fmt);
1939         (void)vfprintf(stderr, fmt, ap);
1940         va_end(ap);
1941         if (*fmt) {
1942                 fmt += strlen(fmt);
1943                 if (fmt[-1] != '\n')
1944                         (void)fputc('\n', stderr);
1945         }
1946         exit(1);
1947         /* NOTREACHED */
1948 }
1949
1950 /* VARARGS */
1951 static void
1952 ndo_warning(netdissect_options *ndo _U_, const char *fmt, ...)
1953 {
1954         va_list ap;
1955
1956         (void)fprintf(stderr, "%s: WARNING: ", program_name);
1957         va_start(ap, fmt);
1958         (void)vfprintf(stderr, fmt, ap);
1959         va_end(ap);
1960         if (*fmt) {
1961                 fmt += strlen(fmt);
1962                 if (fmt[-1] != '\n')
1963                         (void)fputc('\n', stderr);
1964         }
1965 }