/
addrtoname.c
1336 lines (1211 loc) · 34.3 KB
/
addrtoname.c
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
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* 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: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Internet, ethernet, port, and protocol string to address
* and address to string conversion routines
*/
#include <config.h>
#ifdef HAVE_CASPER
#include <libcasper.h>
#include <casper/cap_dns.h>
#endif /* HAVE_CASPER */
#include "netdissect-stdinc.h"
#ifdef USE_ETHER_NTOHOST
#if defined(NET_ETHERNET_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <net/ethernet.h>.
*/
#include <net/ethernet.h>
#elif defined(NETINET_ETHER_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <netinet/ether.h>
*/
#include <netinet/ether.h>
#elif defined(SYS_ETHERNET_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <sys/ethernet.h>
*/
#include <sys/ethernet.h>
#elif defined(ARPA_INET_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <arpa/inet.h>
*/
#include <arpa/inet.h>
#elif defined(NETINET_IF_ETHER_H_DECLARES_ETHER_NTOHOST)
/*
* OK, include <netinet/if_ether.h>, after all the other stuff we
* need to include or define for its benefit.
*/
#define NEED_NETINET_IF_ETHER_H
#else
/*
* We'll have to declare it ourselves.
* If <netinet/if_ether.h> defines struct ether_addr, include
* it. Otherwise, define it ourselves.
*/
#ifdef HAVE_STRUCT_ETHER_ADDR
#define NEED_NETINET_IF_ETHER_H
#else /* HAVE_STRUCT_ETHER_ADDR */
struct ether_addr {
/* Beware FreeBSD calls this "octet". */
unsigned char ether_addr_octet[MAC48_LEN];
};
#endif /* HAVE_STRUCT_ETHER_ADDR */
#endif /* what declares ether_ntohost() */
#ifdef NEED_NETINET_IF_ETHER_H
#include <net/if.h> /* Needed on some platforms */
#include <netinet/in.h> /* Needed on some platforms */
#include <netinet/if_ether.h>
#endif /* NEED_NETINET_IF_ETHER_H */
#ifndef HAVE_DECL_ETHER_NTOHOST
/*
* No header declares it, so declare it ourselves.
*/
extern int ether_ntohost(char *, const struct ether_addr *);
#endif /* !defined(HAVE_DECL_ETHER_NTOHOST) */
#endif /* USE_ETHER_NTOHOST */
#include <pcap.h>
#include <pcap-namedb.h>
#ifndef HAVE_GETSERVENT
#include <getservent.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "addrtostr.h"
#include "ethertype.h"
#include "llc.h"
#include "extract.h"
#include "oui.h"
/*
* hash tables for whatever-to-name translations
*
* ndo_error() called on strdup(3) failure with S_ERR_ND_MEM_ALLOC status
*/
#define HASHNAMESIZE 4096
struct hnamemem {
uint32_t addr;
const char *name;
struct hnamemem *nxt;
};
static struct hnamemem hnametable[HASHNAMESIZE];
static struct hnamemem tporttable[HASHNAMESIZE];
static struct hnamemem uporttable[HASHNAMESIZE];
static struct hnamemem eprototable[HASHNAMESIZE];
static struct hnamemem dnaddrtable[HASHNAMESIZE];
static struct hnamemem ipxsaptable[HASHNAMESIZE];
#ifdef _WIN32
/*
* fake gethostbyaddr for Win2k/XP
* gethostbyaddr() returns incorrect value when AF_INET6 is passed
* to 3rd argument.
*
* h_name in struct hostent is only valid.
*/
static struct hostent *
win32_gethostbyaddr(const char *addr, int len, int type)
{
static struct hostent host;
static char hostbuf[NI_MAXHOST];
char hname[NI_MAXHOST];
host.h_name = hostbuf;
switch (type) {
case AF_INET:
return gethostbyaddr(addr, len, type);
break;
#ifdef AF_INET6
case AF_INET6: {
struct sockaddr_in6 addr6;
memset(&addr6, 0, sizeof(addr6));
addr6.sin6_family = AF_INET6;
memcpy(&addr6.sin6_addr, addr, len);
if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
hname, sizeof(hname), NULL, 0, 0)) {
return NULL;
} else {
strlcpy(host.h_name, hname, NI_MAXHOST);
return &host;
}
break;
}
#endif /* AF_INET6 */
default:
return NULL;
}
}
#define gethostbyaddr win32_gethostbyaddr
#endif /* _WIN32 */
struct h6namemem {
nd_ipv6 addr;
char *name;
struct h6namemem *nxt;
};
static struct h6namemem h6nametable[HASHNAMESIZE];
struct enamemem {
u_short e_addr0;
u_short e_addr1;
u_short e_addr2;
const char *e_name;
u_char *e_nsap; /* used only for nsaptable[] */
struct enamemem *e_nxt;
};
static struct enamemem enametable[HASHNAMESIZE];
static struct enamemem nsaptable[HASHNAMESIZE];
struct bsnamemem {
u_short bs_addr0;
u_short bs_addr1;
u_short bs_addr2;
const char *bs_name;
u_char *bs_bytes;
unsigned int bs_nbytes;
struct bsnamemem *bs_nxt;
};
static struct bsnamemem bytestringtable[HASHNAMESIZE];
struct protoidmem {
uint32_t p_oui;
u_short p_proto;
const char *p_name;
struct protoidmem *p_nxt;
};
static struct protoidmem protoidtable[HASHNAMESIZE];
/*
* A faster replacement for inet_ntoa().
*/
const char *
intoa(uint32_t addr)
{
char *cp;
u_int byte;
int n;
static char buf[sizeof(".xxx.xxx.xxx.xxx")];
addr = ntohl(addr);
cp = buf + sizeof(buf);
*--cp = '\0';
n = 4;
do {
byte = addr & 0xff;
*--cp = (char)(byte % 10) + '0';
byte /= 10;
if (byte > 0) {
*--cp = (char)(byte % 10) + '0';
byte /= 10;
if (byte > 0)
*--cp = (char)byte + '0';
}
*--cp = '.';
addr >>= 8;
} while (--n > 0);
return cp + 1;
}
static uint32_t f_netmask;
static uint32_t f_localnet;
#ifdef HAVE_CASPER
cap_channel_t *capdns;
#endif
/*
* Return a name for the IP address pointed to by ap. This address
* is assumed to be in network byte order.
*
* NOTE: ap is *NOT* necessarily part of the packet data, so you
* *CANNOT* use the ND_TCHECK_* or ND_TTEST_* macros on it. Furthermore,
* even in cases where it *is* part of the packet data, the caller
* would still have to check for a null return value, even if it's
* just printing the return value with "%s" - not all versions of
* printf print "(null)" with "%s" and a null pointer, some of them
* don't check for a null pointer and crash in that case.
*
* The callers of this routine should, before handing this routine
* a pointer to packet data, be sure that the data is present in
* the packet buffer. They should probably do those checks anyway,
* as other data at that layer might not be IP addresses, and it
* also needs to check whether they're present in the packet buffer.
*/
const char *
ipaddr_string(netdissect_options *ndo, const u_char *ap)
{
struct hostent *hp;
uint32_t addr;
struct hnamemem *p;
memcpy(&addr, ap, sizeof(addr));
p = &hnametable[addr & (HASHNAMESIZE-1)];
for (; p->nxt; p = p->nxt) {
if (p->addr == addr)
return (p->name);
}
p->addr = addr;
p->nxt = newhnamemem(ndo);
/*
* Print names unless:
* (1) -n was given.
* (2) Address is foreign and -f was given. (If -f was not
* given, f_netmask and f_localnet are 0 and the test
* evaluates to true)
*/
if (!ndo->ndo_nflag &&
(addr & f_netmask) == f_localnet) {
#ifdef HAVE_CASPER
if (capdns != NULL) {
hp = cap_gethostbyaddr(capdns, (char *)&addr, 4,
AF_INET);
} else
#endif
hp = gethostbyaddr((char *)&addr, 4, AF_INET);
if (hp) {
char *dotp;
p->name = strdup(hp->h_name);
if (p->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(hp->h_name)", __func__);
if (ndo->ndo_Nflag) {
/* Remove domain qualifications */
dotp = strchr(p->name, '.');
if (dotp)
*dotp = '\0';
}
return (p->name);
}
}
p->name = strdup(intoa(addr));
if (p->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(intoa(addr))", __func__);
return (p->name);
}
/*
* Return a name for the IP6 address pointed to by ap. This address
* is assumed to be in network byte order.
*/
const char *
ip6addr_string(netdissect_options *ndo, const u_char *ap)
{
struct hostent *hp;
union {
nd_ipv6 addr;
struct for_hash_addr {
char fill[14];
uint16_t d;
} addra;
} addr;
struct h6namemem *p;
const char *cp;
char ntop_buf[INET6_ADDRSTRLEN];
memcpy(&addr, ap, sizeof(addr));
p = &h6nametable[addr.addra.d & (HASHNAMESIZE-1)];
for (; p->nxt; p = p->nxt) {
if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
return (p->name);
}
memcpy(p->addr, addr.addr, sizeof(nd_ipv6));
p->nxt = newh6namemem(ndo);
/*
* Do not print names if -n was given.
*/
#ifdef AF_INET6
if (!ndo->ndo_nflag) {
#ifdef HAVE_CASPER
if (capdns != NULL) {
hp = cap_gethostbyaddr(capdns, (char *)&addr,
sizeof(addr), AF_INET6);
} else
#endif
hp = gethostbyaddr((char *)&addr, sizeof(addr),
AF_INET6);
if (hp) {
char *dotp;
p->name = strdup(hp->h_name);
if (p->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(hp->h_name)", __func__);
if (ndo->ndo_Nflag) {
/* Remove domain qualifications */
dotp = strchr(p->name, '.');
if (dotp)
*dotp = '\0';
}
return (p->name);
}
}
#endif /* AF_INET6 */
cp = addrtostr6(ap, ntop_buf, sizeof(ntop_buf));
p->name = strdup(cp);
if (p->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(cp)", __func__);
return (p->name);
}
static const char hex[16] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
/*
* Convert an octet to two hex digits.
*
* Coverity appears either:
*
* not to believe the C standard when it asserts that a uint8_t is
* exactly 8 bits in size;
*
* not to believe that an unsigned type of exactly 8 bits has a value
* in the range of 0 to 255;
*
* not to believe that, for a range of unsigned values, if you shift
* one of those values right by 4 bits, the maximum result value is
* the maximum value shifted right by 4 bits, with no stray 1's shifted
* in;
*
* not to believe that 255 >> 4 is 15;
*
* so it gets upset that we're taking a "tainted" unsigned value, shifting
* it right 4 bits, and using it as an index into a 16-element array.
*
* So we do a stupid pointless masking of the result of the shift with
* 0xf, to hammer the point home to Coverity.
*/
static inline char *
octet_to_hex(char *cp, uint8_t octet)
{
*cp++ = hex[(octet >> 4) & 0xf];
*cp++ = hex[(octet >> 0) & 0xf];
return (cp);
}
/* Find the hash node that corresponds the ether address 'ep' */
static struct enamemem *
lookup_emem(netdissect_options *ndo, const u_char *ep)
{
u_int i, j, k;
struct enamemem *tp;
k = (ep[0] << 8) | ep[1];
j = (ep[2] << 8) | ep[3];
i = (ep[4] << 8) | ep[5];
tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
while (tp->e_nxt)
if (tp->e_addr0 == i &&
tp->e_addr1 == j &&
tp->e_addr2 == k)
return tp;
else
tp = tp->e_nxt;
tp->e_addr0 = (u_short)i;
tp->e_addr1 = (u_short)j;
tp->e_addr2 = (u_short)k;
tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
if (tp->e_nxt == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, "%s: calloc", __func__);
return tp;
}
/*
* Find the hash node that corresponds to the bytestring 'bs'
* with length 'nlen'
*/
static struct bsnamemem *
lookup_bytestring(netdissect_options *ndo, const u_char *bs,
const unsigned int nlen)
{
struct bsnamemem *tp;
u_int i, j, k;
if (nlen >= 6) {
k = (bs[0] << 8) | bs[1];
j = (bs[2] << 8) | bs[3];
i = (bs[4] << 8) | bs[5];
} else if (nlen >= 4) {
k = (bs[0] << 8) | bs[1];
j = (bs[2] << 8) | bs[3];
i = 0;
} else
i = j = k = 0;
tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
while (tp->bs_nxt)
if (nlen == tp->bs_nbytes &&
tp->bs_addr0 == i &&
tp->bs_addr1 == j &&
tp->bs_addr2 == k &&
memcmp((const char *)bs, (const char *)(tp->bs_bytes), nlen) == 0)
return tp;
else
tp = tp->bs_nxt;
tp->bs_addr0 = (u_short)i;
tp->bs_addr1 = (u_short)j;
tp->bs_addr2 = (u_short)k;
tp->bs_bytes = (u_char *) calloc(1, nlen);
if (tp->bs_bytes == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: calloc", __func__);
memcpy(tp->bs_bytes, bs, nlen);
tp->bs_nbytes = nlen;
tp->bs_nxt = (struct bsnamemem *)calloc(1, sizeof(*tp));
if (tp->bs_nxt == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: calloc", __func__);
return tp;
}
/* Find the hash node that corresponds the NSAP 'nsap' */
static struct enamemem *
lookup_nsap(netdissect_options *ndo, const u_char *nsap,
u_int nsap_length)
{
u_int i, j, k;
struct enamemem *tp;
const u_char *ensap;
if (nsap_length > 6) {
ensap = nsap + nsap_length - 6;
k = (ensap[0] << 8) | ensap[1];
j = (ensap[2] << 8) | ensap[3];
i = (ensap[4] << 8) | ensap[5];
} else
i = j = k = 0;
tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
while (tp->e_nxt)
if (nsap_length == tp->e_nsap[0] &&
tp->e_addr0 == i &&
tp->e_addr1 == j &&
tp->e_addr2 == k &&
memcmp((const char *)nsap,
(char *)&(tp->e_nsap[1]), nsap_length) == 0)
return tp;
else
tp = tp->e_nxt;
tp->e_addr0 = (u_short)i;
tp->e_addr1 = (u_short)j;
tp->e_addr2 = (u_short)k;
tp->e_nsap = (u_char *)malloc(nsap_length + 1);
if (tp->e_nsap == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, "%s: malloc", __func__);
tp->e_nsap[0] = (u_char)nsap_length; /* guaranteed < ISONSAP_MAX_LENGTH */
memcpy((char *)&tp->e_nsap[1], (const char *)nsap, nsap_length);
tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
if (tp->e_nxt == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, "%s: calloc", __func__);
return tp;
}
/* Find the hash node that corresponds the protoid 'pi'. */
static struct protoidmem *
lookup_protoid(netdissect_options *ndo, const u_char *pi)
{
u_int i, j;
struct protoidmem *tp;
/* 5 octets won't be aligned */
i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
j = (pi[3] << 8) + pi[4];
/* XXX should be endian-insensitive, but do big-endian testing XXX */
tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
while (tp->p_nxt)
if (tp->p_oui == i && tp->p_proto == j)
return tp;
else
tp = tp->p_nxt;
tp->p_oui = i;
tp->p_proto = (u_short)j;
tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
if (tp->p_nxt == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC, "%s: calloc", __func__);
return tp;
}
const char *
mac48_string(netdissect_options *ndo, const uint8_t *ep)
{
int i;
char *cp;
struct enamemem *tp;
int oui;
char buf[BUFSIZE];
tp = lookup_emem(ndo, ep);
if (tp->e_name)
return (tp->e_name);
#ifdef USE_ETHER_NTOHOST
if (!ndo->ndo_nflag) {
char buf2[BUFSIZE];
/*
* This is a non-const copy of ep for ether_ntohost(), which
* has its second argument non-const in OpenBSD. Also saves a
* type cast.
*/
struct ether_addr ea;
memcpy (&ea, ep, MAC48_LEN);
if (ether_ntohost(buf2, &ea) == 0) {
tp->e_name = strdup(buf2);
if (tp->e_name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(buf2)", __func__);
return (tp->e_name);
}
}
#endif
cp = buf;
oui = EXTRACT_BE_U_3(ep);
cp = octet_to_hex(cp, *ep++);
for (i = 5; --i >= 0;) {
*cp++ = ':';
cp = octet_to_hex(cp, *ep++);
}
if (!ndo->ndo_nflag) {
snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)",
tok2str(oui_values, "Unknown", oui));
} else
*cp = '\0';
tp->e_name = strdup(buf);
if (tp->e_name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(buf)", __func__);
return (tp->e_name);
}
const char *
eui64_string(netdissect_options *ndo, const uint8_t *ep)
{
return (linkaddr_string(ndo, ep, LINKADDR_EUI64, EUI64_LEN));
}
/*
* EUI-64 with the rightmost octet first.
*/
const char *
eui64le_string(netdissect_options *ndo, const uint8_t *ep)
{
const unsigned int len = 8;
u_int i;
char *cp;
struct bsnamemem *tp;
char buf[BUFSIZE];
tp = lookup_bytestring(ndo, ep, len);
if (tp->bs_name)
return (tp->bs_name);
cp = buf;
for (i = len; i > 0 ; --i) {
cp = octet_to_hex(cp, *(ep + i - 1));
*cp++ = ':';
}
cp --;
*cp = '\0';
tp->bs_name = strdup(buf);
if (tp->bs_name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(buf)", __func__);
return (tp->bs_name);
}
const char *
linkaddr_string(netdissect_options *ndo, const uint8_t *ep,
const unsigned int type, const unsigned int len)
{
u_int i;
char *cp;
struct bsnamemem *tp;
if (len == 0)
return ("<empty>");
if (type == LINKADDR_MAC48 && len == MAC48_LEN)
return (mac48_string(ndo, ep));
if (type == LINKADDR_FRELAY)
return (q922_string(ndo, ep, len));
tp = lookup_bytestring(ndo, ep, len);
if (tp->bs_name)
return (tp->bs_name);
tp->bs_name = cp = (char *)malloc(len*3);
if (tp->bs_name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: malloc", __func__);
cp = octet_to_hex(cp, *ep++);
for (i = len-1; i > 0 ; --i) {
*cp++ = ':';
cp = octet_to_hex(cp, *ep++);
}
*cp = '\0';
return (tp->bs_name);
}
#define ISONSAP_MAX_LENGTH 20
const char *
isonsap_string(netdissect_options *ndo, const uint8_t *nsap,
u_int nsap_length)
{
u_int nsap_idx;
char *cp;
struct enamemem *tp;
if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH)
return ("isonsap_string: illegal length");
tp = lookup_nsap(ndo, nsap, nsap_length);
if (tp->e_name)
return tp->e_name;
tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx"));
if (cp == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: malloc", __func__);
for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
cp = octet_to_hex(cp, *nsap++);
if (((nsap_idx & 1) == 0) &&
(nsap_idx + 1 < nsap_length)) {
*cp++ = '.';
}
}
*cp = '\0';
return (tp->e_name);
}
const char *
tcpport_string(netdissect_options *ndo, u_short port)
{
struct hnamemem *tp;
uint32_t i = port;
char buf[sizeof("00000")];
for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
if (tp->addr == i)
return (tp->name);
tp->addr = i;
tp->nxt = newhnamemem(ndo);
(void)snprintf(buf, sizeof(buf), "%u", i);
tp->name = strdup(buf);
if (tp->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(buf)", __func__);
return (tp->name);
}
const char *
udpport_string(netdissect_options *ndo, u_short port)
{
struct hnamemem *tp;
uint32_t i = port;
char buf[sizeof("00000")];
for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
if (tp->addr == i)
return (tp->name);
tp->addr = i;
tp->nxt = newhnamemem(ndo);
(void)snprintf(buf, sizeof(buf), "%u", i);
tp->name = strdup(buf);
if (tp->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(buf)", __func__);
return (tp->name);
}
const char *
ipxsap_string(netdissect_options *ndo, u_short port)
{
char *cp;
struct hnamemem *tp;
uint32_t i = port;
char buf[sizeof("0000")];
for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
if (tp->addr == i)
return (tp->name);
tp->addr = i;
tp->nxt = newhnamemem(ndo);
cp = buf;
port = ntohs(port);
*cp++ = hex[port >> 12 & 0xf];
*cp++ = hex[port >> 8 & 0xf];
*cp++ = hex[port >> 4 & 0xf];
*cp++ = hex[port & 0xf];
*cp++ = '\0';
tp->name = strdup(buf);
if (tp->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(buf)", __func__);
return (tp->name);
}
static void
init_servarray(netdissect_options *ndo)
{
struct servent *sv;
struct hnamemem *table;
int i;
char buf[sizeof("0000000000")];
while ((sv = getservent()) != NULL) {
int port = ntohs(sv->s_port);
i = port & (HASHNAMESIZE-1);
if (strcmp(sv->s_proto, "tcp") == 0)
table = &tporttable[i];
else if (strcmp(sv->s_proto, "udp") == 0)
table = &uporttable[i];
else
continue;
while (table->name)
table = table->nxt;
if (ndo->ndo_nflag) {
(void)snprintf(buf, sizeof(buf), "%d", port);
table->name = strdup(buf);
} else
table->name = strdup(sv->s_name);
if (table->name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup", __func__);
table->addr = port;
table->nxt = newhnamemem(ndo);
}
endservent();
}
static const struct eproto {
const char *s;
u_short p;
} eproto_db[] = {
{ "aarp", ETHERTYPE_AARP },
{ "arp", ETHERTYPE_ARP },
{ "atalk", ETHERTYPE_ATALK },
{ "decnet", ETHERTYPE_DN },
{ "ip", ETHERTYPE_IP },
{ "ip6", ETHERTYPE_IPV6 },
{ "lat", ETHERTYPE_LAT },
{ "loopback", ETHERTYPE_LOOPBACK },
{ "mopdl", ETHERTYPE_MOPDL },
{ "moprc", ETHERTYPE_MOPRC },
{ "rarp", ETHERTYPE_REVARP },
{ "sca", ETHERTYPE_SCA },
{ (char *)0, 0 }
};
static void
init_eprotoarray(netdissect_options *ndo)
{
int i;
struct hnamemem *table;
for (i = 0; eproto_db[i].s; i++) {
int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
table = &eprototable[j];
while (table->name)
table = table->nxt;
table->name = eproto_db[i].s;
table->addr = htons(eproto_db[i].p);
table->nxt = newhnamemem(ndo);
}
}
static const struct protoidlist {
const u_char protoid[5];
const char *name;
} protoidlist[] = {
{{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
{{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
{{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
{{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
{{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
{{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
};
/*
* SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
* types.
*/
static void
init_protoidarray(netdissect_options *ndo)
{
int i;
struct protoidmem *tp;
const struct protoidlist *pl;
u_char protoid[5];
protoid[0] = 0;
protoid[1] = 0;
protoid[2] = 0;
for (i = 0; eproto_db[i].s; i++) {
u_short etype = htons(eproto_db[i].p);
memcpy((char *)&protoid[3], (char *)&etype, 2);
tp = lookup_protoid(ndo, protoid);
tp->p_name = strdup(eproto_db[i].s);
if (tp->p_name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(eproto_db[i].s)", __func__);
}
/* Hardwire some SNAP proto ID names */
for (pl = protoidlist; pl->name != NULL; ++pl) {
tp = lookup_protoid(ndo, pl->protoid);
/* Don't override existing name */
if (tp->p_name != NULL)
continue;
tp->p_name = pl->name;
}
}
static const struct etherlist {
const nd_mac48 addr;
const char *name;
} etherlist[] = {
{{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
{{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
};
/*
* Initialize the ethers hash table. We take two different approaches
* depending on whether or not the system provides the ethers name
* service. If it does, we just wire in a few names at startup,
* and mac48_string() fills in the table on demand. If it doesn't,
* then we suck in the entire /etc/ethers file at startup. The idea
* is that parsing the local file will be fast, but spinning through
* all the ethers entries via NIS & next_etherent might be very slow.
*
* XXX pcap_next_etherent doesn't belong in the pcap interface, but
* since the pcap module already does name-to-address translation,
* it's already does most of the work for the ethernet address-to-name
* translation, so we just pcap_next_etherent as a convenience.
*/
static void
init_etherarray(netdissect_options *ndo)
{
const struct etherlist *el;
struct enamemem *tp;
#ifdef USE_ETHER_NTOHOST
char name[256];
#else
struct pcap_etherent *ep;
FILE *fp;
/* Suck in entire ethers file */
fp = fopen(PCAP_ETHERS_FILE, "r");
if (fp != NULL) {
while ((ep = pcap_next_etherent(fp)) != NULL) {
tp = lookup_emem(ndo, ep->addr);
tp->e_name = strdup(ep->name);
if (tp->e_name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(ep->addr)", __func__);
}
(void)fclose(fp);
}
#endif
/* Hardwire some ethernet names */
for (el = etherlist; el->name != NULL; ++el) {
tp = lookup_emem(ndo, el->addr);
/* Don't override existing name */
if (tp->e_name != NULL)
continue;
#ifdef USE_ETHER_NTOHOST
/*
* Use YP/NIS version of name if available.
*/
/* Same workaround as in mac48_string(). */
struct ether_addr ea;
memcpy (&ea, el->addr, MAC48_LEN);
if (ether_ntohost(name, &ea) == 0) {
tp->e_name = strdup(name);
if (tp->e_name == NULL)
(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
"%s: strdup(name)", __func__);
continue;
}