aboutsummaryrefslogtreecommitdiffstats
path: root/pcap.c
blob: e8a4cabae285700848bf359f0e3b88e4e3318379 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
/*
 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.114 2007-11-06 16:20:53 gianluca Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef WIN32
#include <pcap-stdinc.h>
#else /* WIN32 */
#include <sys/types.h>
#endif /* WIN32 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if !defined(_MSC_VER) && !defined(__BORLANDC__)
#include <unistd.h>
#endif
#include <fcntl.h>
#include <errno.h>

#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif

#ifdef MSDOS
#include "pcap-dos.h"
#endif

#include "pcap-int.h"

#ifdef HAVE_DAG_API
#include <dagnew.h>
#include <dagapi.h>
#endif

int
pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{

	return p->read_op(p, cnt, callback, user);
}

/*
 * XXX - is this necessary?
 */
int
pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{

	return p->read_op(p, cnt, callback, user);
}

int
pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
	register int n;

	for (;;) {
		if (p->sf.rfile != NULL) {
			/*
			 * 0 means EOF, so don't loop if we get 0.
			 */
			n = pcap_offline_read(p, cnt, callback, user);
		} else {
			/*
			 * XXX keep reading until we get something
			 * (or an error occurs)
			 */
			do {
				n = p->read_op(p, cnt, callback, user);
			} while (n == 0);
		}
		if (n <= 0)
			return (n);
		if (cnt > 0) {
			cnt -= n;
			if (cnt <= 0)
				return (0);
		}
	}
}

struct singleton {
	struct pcap_pkthdr *hdr;
	const u_char *pkt;
};


static void
pcap_oneshot(u_char *userData, const struct pcap_pkthdr *h, const u_char *pkt)
{
	struct singleton *sp = (struct singleton *)userData;
	*sp->hdr = *h;
	sp->pkt = pkt;
}

const u_char *
pcap_next(pcap_t *p, struct pcap_pkthdr *h)
{
	struct singleton s;

	s.hdr = h;
	if (pcap_dispatch(p, 1, pcap_oneshot, (u_char*)&s) <= 0)
		return (0);
	return (s.pkt);
}

struct pkt_for_fakecallback {
	struct pcap_pkthdr *hdr;
	const u_char **pkt;
};

static void
pcap_fakecallback(u_char *userData, const struct pcap_pkthdr *h,
    const u_char *pkt)
{
	struct pkt_for_fakecallback *sp = (struct pkt_for_fakecallback *)userData;

	*sp->hdr = *h;
	*sp->pkt = pkt;
}

int 
pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
    const u_char **pkt_data)
{
	struct pkt_for_fakecallback s;

	s.hdr = &p->pcap_header;
	s.pkt = pkt_data;

	/* Saves a pointer to the packet headers */
	*pkt_header= &p->pcap_header;

	if (p->sf.rfile != NULL) {
		int status;

		/* We are on an offline capture */
		status = pcap_offline_read(p, 1, pcap_fakecallback,
		    (u_char *)&s);

		/*
		 * Return codes for pcap_offline_read() are:
		 *   -  0: EOF
		 *   - -1: error
		 *   - >1: OK
		 * The first one ('0') conflicts with the return code of
		 * 0 from pcap_read() meaning "no packets arrived before
		 * the timeout expired", so we map it to -2 so you can
		 * distinguish between an EOF from a savefile and a
		 * "no packets arrived before the timeout expired, try
		 * again" from a live capture.
		 */
		if (status == 0)
			return (-2);
		else
			return (status);
	}

	/*
	 * Return codes for pcap_read() are:
	 *   -  0: timeout
	 *   - -1: error
	 *   - -2: loop was broken out of with pcap_breakloop()
	 *   - >1: OK
	 * The first one ('0') conflicts with the return code of 0 from
	 * pcap_offline_read() meaning "end of file".
	*/
	return (p->read_op(p, 1, pcap_fakecallback, (u_char *)&s));
}

/*
 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
 */
void
pcap_breakloop(pcap_t *p)
{
	p->break_loop = 1;
}

int
pcap_datalink(pcap_t *p)
{
	return (p->linktype);
}

int
pcap_datalink_ext(pcap_t *p)
{
	return (p->linktype_ext);
}

int
pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
{
	if (p->dlt_count == 0) {
		/*
		 * We couldn't fetch the list of DLTs, which means
		 * this platform doesn't support changing the
		 * DLT for an interface.  Return a list of DLTs
		 * containing only the DLT this device supports.
		 */
		*dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
		if (*dlt_buffer == NULL) {
			(void)snprintf(p->errbuf, sizeof(p->errbuf),
			    "malloc: %s", pcap_strerror(errno));
			return (-1);
		}
		**dlt_buffer = p->linktype;
		return (1);
	} else {
		*dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
		if (*dlt_buffer == NULL) {
			(void)snprintf(p->errbuf, sizeof(p->errbuf),
			    "malloc: %s", pcap_strerror(errno));
			return (-1);
		}
		(void)memcpy(*dlt_buffer, p->dlt_list,
		    sizeof(**dlt_buffer) * p->dlt_count);
		return (p->dlt_count);
	}
}

int
pcap_set_datalink(pcap_t *p, int dlt)
{
	int i;
	const char *dlt_name;

	if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
		/*
		 * We couldn't fetch the list of DLTs, or we don't
		 * have a "set datalink" operation, which means
		 * this platform doesn't support changing the
		 * DLT for an interface.  Check whether the new
		 * DLT is the one this interface supports.
		 */
		if (p->linktype != dlt)
			goto unsupported;

		/*
		 * It is, so there's nothing we need to do here.
		 */
		return (0);
	}
	for (i = 0; i < p->dlt_count; i++)
		if (p->dlt_list[i] == dlt)
			break;
	if (i >= p->dlt_count)
		goto unsupported;
	if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
	    dlt == DLT_DOCSIS) {
		/*
		 * This is presumably an Ethernet device, as the first
		 * link-layer type it offers is DLT_EN10MB, and the only
		 * other type it offers is DLT_DOCSIS.  That means that
		 * we can't tell the driver to supply DOCSIS link-layer
		 * headers - we're just pretending that's what we're
		 * getting, as, presumably, we're capturing on a dedicated
		 * link to a Cisco Cable Modem Termination System, and
		 * it's putting raw DOCSIS frames on the wire inside low-level
		 * Ethernet framing.
		 */
		p->linktype = dlt;
		return (0);
	}
	if (p->set_datalink_op(p, dlt) == -1)
		return (-1);
	p->linktype = dlt;
	return (0);

unsupported:
	dlt_name = pcap_datalink_val_to_name(dlt);
	if (dlt_name != NULL) {
		(void) snprintf(p->errbuf, sizeof(p->errbuf),
		    "%s is not one of the DLTs supported by this device",
		    dlt_name);
	} else {
		(void) snprintf(p->errbuf, sizeof(p->errbuf),
		    "DLT %d is not one of the DLTs supported by this device",
		    dlt);
	}
	return (-1);
}

struct dlt_choice {
	const char *name;
	const char *description;
	int	dlt;
};

#define DLT_CHOICE(code, description) { #code, description, code }
#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }

static struct dlt_choice dlt_choices[] = {
	DLT_CHOICE(DLT_NULL, "BSD loopback"),
	DLT_CHOICE(DLT_EN10MB, "Ethernet"),
	DLT_CHOICE(DLT_IEEE802, "Token ring"),
	DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"),
	DLT_CHOICE(DLT_SLIP, "SLIP"),
	DLT_CHOICE(DLT_PPP, "PPP"),
	DLT_CHOICE(DLT_FDDI, "FDDI"),
	DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
	DLT_CHOICE(DLT_RAW, "Raw IP"),
	DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
	DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
	DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
	DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
	DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
        DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"),
	DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
	DLT_CHOICE(DLT_IEEE802_11, "802.11"),
	DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
	DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
	DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
	DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
	DLT_CHOICE(DLT_LTALK, "Localtalk"),
	DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
	DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
	DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
	DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
	DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"),
	DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
        DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
	DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
        DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"),
        DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"),
	DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
        DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"),
        DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
        DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"),
	DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
	DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
	DLT_CHOICE(DLT_MTP2, "SS7 MTP2"),
	DLT_CHOICE(DLT_MTP3, "SS7 MTP3"),
	DLT_CHOICE(DLT_SCCP, "SS7 SCCP"),
	DLT_CHOICE(DLT_DOCSIS, "DOCSIS"),
	DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
	DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
        DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
	DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"),
	DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"),
	DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
	DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"),
	DLT_CHOICE(DLT_GPF_T, "GPF-T"),
	DLT_CHOICE(DLT_GPF_F, "GPF-F"),
	DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"),
	DLT_CHOICE(DLT_ERF_ETH,	"Ethernet with Endace ERF header"),
	DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"),
	DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
	DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"),
	DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"),
	DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"),
	DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"),
	DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"),
	DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"),
	DLT_CHOICE(DLT_A429, "Arinc 429"),
	DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"),
	DLT_CHOICE(DLT_USB, "USB"),
	DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
	DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
	DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"),
	DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"),
	DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
	DLT_CHOICE(DLT_PPI, "Per-Packet Information"),
	DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
	DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"),
	DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4"),
	DLT_CHOICE(DLT_SITA, "SITA pseudo-header"),
	DLT_CHOICE(DLT_ERF, "Endace ERF header"),
	DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"),
	DLT_CHOICE(DLT_IPMB, "IPMB"),
	DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"),
	DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
	DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"),
	DLT_CHOICE_SENTINEL
};

/*
 * This array is designed for mapping upper and lower case letter
 * together for a case independent comparison.  The mappings are
 * based upon ascii character sequences.
 */
static const u_char charmap[] = {
	(u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
	(u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
	(u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
	(u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
	(u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
	(u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
	(u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
	(u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
	(u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
	(u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
	(u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
	(u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
	(u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
	(u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
	(u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
	(u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
	(u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
	(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
	(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
	(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
	(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
	(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
	(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
	(u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
	(u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
	(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
	(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
	(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
	(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
	(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
	(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
	(u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
	(u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
	(u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
	(u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
	(u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
	(u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
	(u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
	(u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
	(u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
	(u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
	(u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
	(u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
	(u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
	(u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
	(u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
	(u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
	(u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
	(u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
	(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
	(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
	(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
	(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
	(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
	(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
	(u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
	(u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
	(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
	(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
	(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
	(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
	(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
	(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
	(u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
};

int
pcap_strcasecmp(const char *s1, const char *s2)
{
	register const u_char	*cm = charmap,
				*us1 = (const u_char *)s1,
				*us2 = (const u_char *)s2;

	while (cm[*us1] == cm[*us2++])
		if (*us1++ == '\0')
			return(0);
	return (cm[*us1] - cm[*--us2]);
}

int
pcap_datalink_name_to_val(const char *name)
{
	int i;

	for (i = 0; dlt_choices[i].name != NULL; i++) {
		if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
		    name) == 0)
			return (dlt_choices[i].dlt);
	}
	return (-1);
}

const char *
pcap_datalink_val_to_name(int dlt)
{
	int i;

	for (i = 0; dlt_choices[i].name != NULL; i++) {
		if (dlt_choices[i].dlt == dlt)
			return (dlt_choices[i].name + sizeof("DLT_") - 1);
	}
	return (NULL);
}

const char *
pcap_datalink_val_to_description(int dlt)
{
	int i;

	for (i = 0; dlt_choices[i].name != NULL; i++) {
		if (dlt_choices[i].dlt == dlt)
			return (dlt_choices[i].description);
	}
	return (NULL);
}

int
pcap_snapshot(pcap_t *p)
{
	return (p->snapshot);
}

int
pcap_is_swapped(pcap_t *p)
{
	return (p->sf.swapped);
}

int
pcap_major_version(pcap_t *p)
{
	return (p->sf.version_major);
}

int
pcap_minor_version(pcap_t *p)
{
	return (p->sf.version_minor);
}

FILE *
pcap_file(pcap_t *p)
{
	return (p->sf.rfile);
}

int
pcap_fileno(pcap_t *p)
{
#ifndef WIN32
	return (p->fd);
#else
	if (p->adapter != NULL)
		return ((int)(DWORD)p->adapter->hFile);
	else
		return (-1);
#endif
}

#if !defined(WIN32) && !defined(MSDOS)
int
pcap_get_selectable_fd(pcap_t *p)
{
	return (p->selectable_fd);
}
#endif

void
pcap_perror(pcap_t *p, char *prefix)
{
	fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
}

char *
pcap_geterr(pcap_t *p)
{
	return (p->errbuf);
}

int
pcap_getnonblock(pcap_t *p, char *errbuf)
{
	return p->getnonblock_op(p, errbuf);
}

/*
 * Get the current non-blocking mode setting, under the assumption that
 * it's just the standard POSIX non-blocking flag.
 *
 * We don't look at "p->nonblock", in case somebody tweaked the FD
 * directly.
 */
#if !defined(WIN32) && !defined(MSDOS)
int
pcap_getnonblock_fd(pcap_t *p, char *errbuf)
{
	int fdflags;

	fdflags = fcntl(p->fd, F_GETFL, 0);
	if (fdflags == -1) {
		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
		    pcap_strerror(errno));
		return (-1);
	}
	if (fdflags & O_NONBLOCK)
		return (1);
	else
		return (0);
}
#endif

int
pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
{
	return p->setnonblock_op(p, nonblock, errbuf);
}

#if !defined(WIN32) && !defined(MSDOS)
/*
 * Set non-blocking mode, under the assumption that it's just the
 * standard POSIX non-blocking flag.  (This can be called by the
 * per-platform non-blocking-mode routine if that routine also
 * needs to do some additional work.)
 */
int
pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf)
{
	int fdflags;

	fdflags = fcntl(p->fd, F_GETFL, 0);
	if (fdflags == -1) {
		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
		    pcap_strerror(errno));
		return (-1);
	}
	if (nonblock)
		fdflags |= O_NONBLOCK;
	else
		fdflags &= ~O_NONBLOCK;
	if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s",
		    pcap_strerror(errno));
		return (-1);
	}
	return (0);
}
#endif

#ifdef WIN32
/*
 * Generate a string for the last Win32-specific error (i.e. an error generated when 
 * calling a Win32 API).
 * For errors occurred during standard C calls, we still use pcap_strerror()
 */
char *
pcap_win32strerror(void)
{
	DWORD error;
	static char errbuf[PCAP_ERRBUF_SIZE+1];
	int errlen;
	char *p;

	error = GetLastError();
	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
	    PCAP_ERRBUF_SIZE, NULL);

	/*
	 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the
	 * message.  Get rid of it.
	 */
	errlen = strlen(errbuf);
	if (errlen >= 2) {
		errbuf[errlen - 1] = '\0';
		errbuf[errlen - 2] = '\0';
	}
	p = strchr(errbuf, '\0');
	snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error);
	return (errbuf);
}
#endif

/*
 * Not all systems have strerror().
 */
const char *
pcap_strerror(int errnum)
{
#ifdef HAVE_STRERROR
	return (strerror(errnum));
#else
	extern int sys_nerr;
	extern const char *const sys_errlist[];
	static char ebuf[20];

	if ((unsigned int)errnum < sys_nerr)
		return ((char *)sys_errlist[errnum]);
	(void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
	return(ebuf);
#endif
}

int
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
{
	return p->setfilter_op(p, fp);
}

/*
 * Set direction flag, which controls whether we accept only incoming
 * packets, only outgoing packets, or both.
 * Note that, depending on the platform, some or all direction arguments
 * might not be supported.
 */
int
pcap_setdirection(pcap_t *p, pcap_direction_t d)
{
	if (p->setdirection_op == NULL) {
		snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
		    "Setting direction is not implemented on this platform");
		return -1;
	} else
		return p->setdirection_op(p, d);
}

int
pcap_stats(pcap_t *p, struct pcap_stat *ps)
{
	return p->stats_op(p, ps);
}

static int
pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
{
	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "Statistics aren't available from a pcap_open_dead pcap_t");
	return (-1);
}

#ifdef WIN32
int
pcap_setbuff(pcap_t *p, int dim)
{
	return p->setbuff_op(p, dim);
}

static int
pcap_setbuff_dead(pcap_t *p, int dim)
{
	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
	return (-1);
}

int
pcap_setmode(pcap_t *p, int mode)
{
	return p->setmode_op(p, mode);
}

static int
pcap_setmode_dead(pcap_t *p, int mode)
{
	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "impossible to set mode on a pcap_open_dead pcap_t");
	return (-1);
}

int
pcap_setmintocopy(pcap_t *p, int size)
{
	return p->setmintocopy_op(p, size);
}

static int
pcap_setmintocopy_dead(pcap_t *p, int size)
{
	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
	    "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
	return (-1);
}
#endif

void
pcap_close_common(pcap_t *p)
{
	if (p->buffer != NULL)
		free(p->buffer);
#if !defined(WIN32) && !defined(MSDOS)
	if (p->fd >= 0)
		close(p->fd);
#endif
}

static void
pcap_close_dead(pcap_t *p _U_)
{
	/* Nothing to do. */
}

pcap_t *
pcap_open_dead(int linktype, int snaplen)
{
	pcap_t *p;

	p = malloc(sizeof(*p));
	if (p == NULL)
		return NULL;
	memset (p, 0, sizeof(*p));
	p->snapshot = snaplen;
	p->linktype = linktype;
	p->stats_op = pcap_stats_dead;
#ifdef WIN32
	p->setbuff_op = pcap_setbuff_dead;
	p->setmode_op = pcap_setmode_dead;
	p->setmintocopy_op = pcap_setmintocopy_dead;
#endif
	p->close_op = pcap_close_dead;
	return p;
}

/*
 * API compatible with WinPcap's "send a packet" routine - returns -1
 * on error, 0 otherwise.
 *
 * XXX - what if we get a short write?
 */
int
pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
{
	if (p->inject_op(p, buf, size) == -1)
		return (-1);
	return (0);
}

/*
 * API compatible with OpenBSD's "send a packet" routine - returns -1 on
 * error, number of bytes written otherwise.
 */
int
pcap_inject(pcap_t *p, const void *buf, size_t size)
{
	return (p->inject_op(p, buf, size));
}

void
pcap_close(pcap_t *p)
{
	p->close_op(p);
	if (p->dlt_list != NULL)
		free(p->dlt_list);
	pcap_freecode(&p->fcode);
	free(p);
}

/*
 * We make the version string static, and return a pointer to it, rather
 * than exporting the version string directly.  On at least some UNIXes,
 * if you import data from a shared library into an program, the data is
 * bound into the program binary, so if the string in the version of the
 * library with which the program was linked isn't the same as the
 * string in the version of the library with which the program is being
 * run, various undesirable things may happen (warnings, the string
 * being the one from the version of the library with which the program
 * was linked, or even weirder things, such as the string being the one
 * from the library but being truncated).
 */
#ifdef HAVE_VERSION_H
#include "version.h"
#else
static const char pcap_version_string[] = "libpcap version 0.9[.x]";
#endif

#ifdef WIN32
/*
 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap
 * version numbers when building WinPcap.  (It'd be nice to do so for
 * the packet.dll version number as well.)
 */
static const char wpcap_version_string[] = "4.0";
static const char pcap_version_string_fmt[] =
    "WinPcap version %s, based on %s";
static const char pcap_version_string_packet_dll_fmt[] =
    "WinPcap version %s (packet.dll version %s), based on %s";
static char *full_pcap_version_string;

const char *
pcap_lib_version(void)
{
	char *packet_version_string;
	size_t full_pcap_version_string_len;

	if (full_pcap_version_string == NULL) {
		/*
		 * Generate the version string.
		 */
		packet_version_string = PacketGetVersion();
		if (strcmp(wpcap_version_string, packet_version_string) == 0) {
			/*
			 * WinPcap version string and packet.dll version
			 * string are the same; just report the WinPcap
			 * version.
			 */
			full_pcap_version_string_len =
			    (sizeof pcap_version_string_fmt - 4) +
			    strlen(wpcap_version_string) +
			    strlen(pcap_version_string);
			full_pcap_version_string =
			    malloc(full_pcap_version_string_len);
			sprintf(full_pcap_version_string,
			    pcap_version_string_fmt, wpcap_version_string,
			    pcap_version_string);
		} else {
			/*
			 * WinPcap version string and packet.dll version
			 * string are different; that shouldn't be the
			 * case (the two libraries should come from the
			 * same version of WinPcap), so we report both
			 * versions.
			 */
			full_pcap_version_string_len =
			    (sizeof pcap_version_string_packet_dll_fmt - 6) +
			    strlen(wpcap_version_string) +
			    strlen(packet_version_string) +
			    strlen(pcap_version_string);
			full_pcap_version_string = malloc(full_pcap_version_string_len);

			sprintf(full_pcap_version_string,
			    pcap_version_string_packet_dll_fmt,
			    wpcap_version_string, packet_version_string,
			    pcap_version_string);
		}
	}
	return (full_pcap_version_string);
}

#elif defined(MSDOS)

static char *full_pcap_version_string;

const char *
pcap_lib_version (void)
{
	char *packet_version_string;
	size_t full_pcap_version_string_len;
	static char dospfx[] = "DOS-";

	if (full_pcap_version_string == NULL) {
		/*
		 * Generate the version string.
		 */
		full_pcap_version_string_len =
		    sizeof dospfx + strlen(pcap_version_string);
		full_pcap_version_string =
		    malloc(full_pcap_version_string_len);
		strcpy(full_pcap_version_string, dospfx);
		strcat(full_pcap_version_string, pcap_version_string);
	}
	return (full_pcap_version_string);
}

#else /* UN*X */

const char *
pcap_lib_version(void)
{
	return (pcap_version_string);
}
#endif