summaryrefslogtreecommitdiffstats
path: root/print-atalk.c
blob: d9f86c7255b0efd64e6383a9c814e468a4892226 (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
/*
 * Copyright (c) 1988, 1989, 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.
 */

/* \summary: AppleTalk printer */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "netdissect-stdinc.h"

#include <stdio.h>
#include <string.h>

#include "netdissect.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#include "appletalk.h"


static const struct tok type2str[] = {
	{ ddpRTMP,		"rtmp" },
	{ ddpRTMPrequest,	"rtmpReq" },
	{ ddpECHO,		"echo" },
	{ ddpIP,		"IP" },
	{ ddpARP,		"ARP" },
	{ ddpKLAP,		"KLAP" },
	{ 0,			NULL }
};

struct aarp {
	nd_uint16_t	htype, ptype;
	nd_uint8_t	halen, palen;
	nd_uint16_t	op;
	nd_mac_addr	hsaddr;
	uint8_t		psaddr[4];
	nd_mac_addr	hdaddr;
	uint8_t		pdaddr[4];
};

static void atp_print(netdissect_options *, const struct atATP *, u_int);
static void atp_bitmap_print(netdissect_options *, u_char);
static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
						const u_char *,
						u_short, u_char, u_char);
static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *,
					       const u_char *);
static const char *ataddr_string(netdissect_options *, u_short, u_char);
static void ddp_print(netdissect_options *, const u_char *, u_int, u_int, u_short, u_char, u_char);
static const char *ddpskt_string(netdissect_options *, u_int);

/*
 * Print LLAP packets received on a physical LocalTalk interface.
 */
void
ltalk_if_print(netdissect_options *ndo,
               const struct pcap_pkthdr *h, const u_char *p)
{
	u_int hdrlen;

	ndo->ndo_protocol = "ltalk";
	hdrlen = llap_print(ndo, p, h->len);
	if (hdrlen == 0) {
		/* Cut short by the snapshot length. */
		ndo->ndo_ll_hdr_len += h->caplen;
		return;
	}
	ndo->ndo_ll_hdr_len += hdrlen;
}

/*
 * Print AppleTalk LLAP packets.
 */
u_int
llap_print(netdissect_options *ndo,
           const u_char *bp, u_int length)
{
	const struct LAP *lp;
	const struct atDDP *dp;
	const struct atShortDDP *sdp;
	u_short snet;
	u_int hdrlen;

	ndo->ndo_protocol = "llap";
	if (length < sizeof(*lp)) {
		ND_PRINT(" [|llap %u]", length);
		return (length);
	}
	if (!ND_TTEST_LEN(bp, sizeof(*lp))) {
		nd_print_trunc(ndo);
		return (0);	/* cut short by the snapshot length */
	}
	lp = (const struct LAP *)bp;
	bp += sizeof(*lp);
	length -= sizeof(*lp);
	hdrlen = sizeof(*lp);
	switch (GET_U_1(lp->type)) {

	case lapShortDDP:
		if (length < ddpSSize) {
			ND_PRINT(" [|sddp %u]", length);
			return (length);
		}
		if (!ND_TTEST_LEN(bp, ddpSSize)) {
			ND_PRINT(" [|sddp]");
			return (0);	/* cut short by the snapshot length */
		}
		sdp = (const struct atShortDDP *)bp;
		ND_PRINT("%s.%s",
		    ataddr_string(ndo, 0, GET_U_1(lp->src)),
		    ddpskt_string(ndo, GET_U_1(sdp->srcSkt)));
		ND_PRINT(" > %s.%s:",
		    ataddr_string(ndo, 0, GET_U_1(lp->dst)),
		    ddpskt_string(ndo, GET_U_1(sdp->dstSkt)));
		bp += ddpSSize;
		length -= ddpSSize;
		hdrlen += ddpSSize;
		ddp_print(ndo, bp, length, GET_U_1(sdp->type), 0,
			  GET_U_1(lp->src), GET_U_1(sdp->srcSkt));
		break;

	case lapDDP:
		if (length < ddpSize) {
			ND_PRINT(" [|ddp %u]", length);
			return (length);
		}
		if (!ND_TTEST_LEN(bp, ddpSize)) {
			ND_PRINT(" [|ddp]");
			return (0);	/* cut short by the snapshot length */
		}
		dp = (const struct atDDP *)bp;
		snet = GET_BE_U_2(dp->srcNet);
		ND_PRINT("%s.%s",
			 ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
			 ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
		ND_PRINT(" > %s.%s:",
		    ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
		    ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
		bp += ddpSize;
		length -= ddpSize;
		hdrlen += ddpSize;
		ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
			  GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
		break;

#ifdef notdef
	case lapKLAP:
		klap_print(bp, length);
		break;
#endif

	default:
		ND_PRINT("%u > %u at-lap#%u %u",
		    GET_U_1(lp->src), GET_U_1(lp->dst), GET_U_1(lp->type),
		    length);
		break;
	}
	return (hdrlen);
}

/*
 * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 * packets in them).
 */
void
atalk_print(netdissect_options *ndo,
            const u_char *bp, u_int length)
{
	const struct atDDP *dp;
	u_short snet;

	ndo->ndo_protocol = "atalk";
        if(!ndo->ndo_eflag)
            ND_PRINT("AT ");

	if (length < ddpSize) {
		ND_PRINT(" [|ddp %u]", length);
		return;
	}
	if (!ND_TTEST_LEN(bp, ddpSize)) {
		ND_PRINT(" [|ddp]");
		return;
	}
	dp = (const struct atDDP *)bp;
	snet = GET_BE_U_2(dp->srcNet);
	ND_PRINT("%s.%s", ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
		 ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
	ND_PRINT(" > %s.%s: ",
	       ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
	       ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
	bp += ddpSize;
	length -= ddpSize;
	ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
		  GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
}

/* XXX should probably pass in the snap header and do checks like arp_print() */
void
aarp_print(netdissect_options *ndo,
           const u_char *bp, u_int length)
{
	const struct aarp *ap;

#define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])

	ndo->ndo_protocol = "aarp";
	ND_PRINT("aarp ");
	ap = (const struct aarp *)bp;
	if (!ND_TTEST_SIZE(ap)) {
		/* Just bail if we don't have the whole chunk. */
		nd_print_trunc(ndo);
		return;
	}
	if (length < sizeof(*ap)) {
		ND_PRINT(" [|aarp %u]", length);
		return;
	}
	if (GET_BE_U_2(ap->htype) == 1 &&
	    GET_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
	    GET_U_1(ap->halen) == MAC_ADDR_LEN && GET_U_1(ap->palen) == 4)
		switch (GET_BE_U_2(ap->op)) {

		case 1:				/* request */
			ND_PRINT("who-has %s tell %s", AT(pdaddr), AT(psaddr));
			return;

		case 2:				/* response */
			ND_PRINT("reply %s is-at %s", AT(psaddr), GET_ETHERADDR_STRING(ap->hsaddr));
			return;

		case 3:				/* probe (oy!) */
			ND_PRINT("probe %s tell %s", AT(pdaddr), AT(psaddr));
			return;
		}
	ND_PRINT("len %u op %u htype %u ptype %#x halen %u palen %u",
	    length, GET_BE_U_2(ap->op), GET_BE_U_2(ap->htype),
	    GET_BE_U_2(ap->ptype), GET_U_1(ap->halen), GET_U_1(ap->palen));
}

/*
 * Print AppleTalk Datagram Delivery Protocol packets.
 */
static void
ddp_print(netdissect_options *ndo,
          const u_char *bp, u_int length, u_int t,
          u_short snet, u_char snode, u_char skt)
{

	switch (t) {

	case ddpNBP:
		nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
		break;

	case ddpATP:
		atp_print(ndo, (const struct atATP *)bp, length);
		break;

	case ddpEIGRP:
		eigrp_print(ndo, bp, length);
		break;

	default:
		ND_PRINT(" at-%s %u", tok2str(type2str, NULL, t), length);
		break;
	}
}

static void
atp_print(netdissect_options *ndo,
          const struct atATP *ap, u_int length)
{
	uint8_t control;
	uint32_t data;

	if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
		/* Just bail if we don't have the whole chunk. */
		nd_print_trunc(ndo);
		return;
	}
	if (length < sizeof(*ap)) {
		ND_PRINT(" [|atp %u]", length);
		return;
	}
	length -= sizeof(*ap);
	control = GET_U_1(ap->control);
	switch (control & 0xc0) {

	case atpReqCode:
		ND_PRINT(" atp-req%s %u",
			     control & atpXO? " " : "*",
			     GET_BE_U_2(ap->transID));

		atp_bitmap_print(ndo, GET_U_1(ap->bitmap));

		if (length != 0)
			ND_PRINT(" [len=%u]", length);

		switch (control & (atpEOM|atpSTS)) {
		case atpEOM:
			ND_PRINT(" [EOM]");
			break;
		case atpSTS:
			ND_PRINT(" [STS]");
			break;
		case atpEOM|atpSTS:
			ND_PRINT(" [EOM,STS]");
			break;
		}
		break;

	case atpRspCode:
		ND_PRINT(" atp-resp%s%u:%u (%u)",
			     control & atpEOM? "*" : " ",
			     GET_BE_U_2(ap->transID), GET_U_1(ap->bitmap),
			     length);
		switch (control & (atpXO|atpSTS)) {
		case atpXO:
			ND_PRINT(" [XO]");
			break;
		case atpSTS:
			ND_PRINT(" [STS]");
			break;
		case atpXO|atpSTS:
			ND_PRINT(" [XO,STS]");
			break;
		}
		break;

	case atpRelCode:
		ND_PRINT(" atp-rel  %u", GET_BE_U_2(ap->transID));

		atp_bitmap_print(ndo, GET_U_1(ap->bitmap));

		/* length should be zero */
		if (length)
			ND_PRINT(" [len=%u]", length);

		/* there shouldn't be any control flags */
		if (control & (atpXO|atpEOM|atpSTS)) {
			char c = '[';
			if (control & atpXO) {
				ND_PRINT("%cXO", c);
				c = ',';
			}
			if (control & atpEOM) {
				ND_PRINT("%cEOM", c);
				c = ',';
			}
			if (control & atpSTS) {
				ND_PRINT("%cSTS", c);
			}
			ND_PRINT("]");
		}
		break;

	default:
		ND_PRINT(" atp-0x%x  %u (%u)", control,
			     GET_BE_U_2(ap->transID), length);
		break;
	}
	data = GET_BE_U_4(ap->userData);
	if (data != 0)
		ND_PRINT(" 0x%x", data);
}

static void
atp_bitmap_print(netdissect_options *ndo,
                 u_char bm)
{
	u_int i;

	/*
	 * The '& 0xff' below is needed for compilers that want to sign
	 * extend a u_char, which is the case with the Ultrix compiler.
	 * (gcc is smart enough to eliminate it, at least on the Sparc).
	 */
	if ((bm + 1) & (bm & 0xff)) {
		char c = '<';
		for (i = 0; bm; ++i) {
			if (bm & 1) {
				ND_PRINT("%c%u", c, i);
				c = ',';
			}
			bm >>= 1;
		}
		ND_PRINT(">");
	} else {
		for (i = 0; bm; ++i)
			bm >>= 1;
		if (i > 1)
			ND_PRINT("<0-%u>", i - 1);
		else
			ND_PRINT("<0>");
	}
}

static void
nbp_print(netdissect_options *ndo,
          const struct atNBP *np, u_int length, u_short snet,
          u_char snode, u_char skt)
{
	const struct atNBPtuple *tp =
		(const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
	uint8_t control;
	u_int i;
	const u_char *ep;

	if (length < nbpHeaderSize) {
		ND_PRINT(" truncated-nbp %u", length);
		return;
	}

	length -= nbpHeaderSize;
	if (length < 8) {
		/* must be room for at least one tuple */
		ND_PRINT(" truncated-nbp %u", length + nbpHeaderSize);
		return;
	}
	/* ep points to end of available data */
	ep = ndo->ndo_snapend;
	if ((const u_char *)tp > ep) {
		nd_print_trunc(ndo);
		return;
	}
	control = GET_U_1(np->control);
	switch (i = (control & 0xf0)) {

	case nbpBrRq:
	case nbpLkUp:
		ND_PRINT(i == nbpLkUp? " nbp-lkup %u:":" nbp-brRq %u:",
			 GET_U_1(np->id));
		if ((const u_char *)(tp + 1) > ep) {
			nd_print_trunc(ndo);
			return;
		}
		(void)nbp_name_print(ndo, tp, ep);
		/*
		 * look for anomalies: the spec says there can only
		 * be one tuple, the address must match the source
		 * address and the enumerator should be zero.
		 */
		if ((control & 0xf) != 1)
			ND_PRINT(" [ntup=%u]", control & 0xf);
		if (GET_U_1(tp->enumerator))
			ND_PRINT(" [enum=%u]", GET_U_1(tp->enumerator));
		if (GET_BE_U_2(tp->net) != snet ||
		    GET_U_1(tp->node) != snode ||
		    GET_U_1(tp->skt) != skt)
			ND_PRINT(" [addr=%s.%u]",
			    ataddr_string(ndo, GET_BE_U_2(tp->net),
					  GET_U_1(tp->node)),
			    GET_U_1(tp->skt));
		break;

	case nbpLkUpReply:
		ND_PRINT(" nbp-reply %u:", GET_U_1(np->id));

		/* print each of the tuples in the reply */
		for (i = control & 0xf; i != 0 && tp; i--)
			tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
		break;

	default:
		ND_PRINT(" nbp-0x%x  %u (%u)", control, GET_U_1(np->id),
			 length);
		break;
	}
}

/* print a counted string */
static const u_char *
print_cstring(netdissect_options *ndo,
              const u_char *cp, const u_char *ep)
{
	u_int length;

	if (cp >= ep) {
		nd_print_trunc(ndo);
		return (0);
	}
	length = GET_U_1(cp);
	cp++;

	/* Spec says string can be at most 32 bytes long */
	if (length > 32) {
		ND_PRINT("[len=%u]", length);
		return (0);
	}
	while (length != 0) {
		if (cp >= ep) {
			nd_print_trunc(ndo);
			return (0);
		}
		fn_print_char(ndo, GET_U_1(cp));
		cp++;
		length--;
	}
	return (cp);
}

static const struct atNBPtuple *
nbp_tuple_print(netdissect_options *ndo,
                const struct atNBPtuple *tp, const u_char *ep,
                u_short snet, u_char snode, u_char skt)
{
	const struct atNBPtuple *tpn;

	if ((const u_char *)(tp + 1) > ep) {
		nd_print_trunc(ndo);
		return 0;
	}
	tpn = nbp_name_print(ndo, tp, ep);

	/* if the enumerator isn't 1, print it */
	if (GET_U_1(tp->enumerator) != 1)
		ND_PRINT("(%u)", GET_U_1(tp->enumerator));

	/* if the socket doesn't match the src socket, print it */
	if (GET_U_1(tp->skt) != skt)
		ND_PRINT(" %u", GET_U_1(tp->skt));

	/* if the address doesn't match the src address, it's an anomaly */
	if (GET_BE_U_2(tp->net) != snet ||
	    GET_U_1(tp->node) != snode)
		ND_PRINT(" [addr=%s]",
		    ataddr_string(ndo, GET_BE_U_2(tp->net), GET_U_1(tp->node)));

	return (tpn);
}

static const struct atNBPtuple *
nbp_name_print(netdissect_options *ndo,
               const struct atNBPtuple *tp, const u_char *ep)
{
	const u_char *cp = (const u_char *)tp + nbpTupleSize;

	ND_PRINT(" ");

	/* Object */
	ND_PRINT("\"");
	if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
		/* Type */
		ND_PRINT(":");
		if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
			/* Zone */
			ND_PRINT("@");
			if ((cp = print_cstring(ndo, cp, ep)) != NULL)
				ND_PRINT("\"");
		}
	}
	return ((const struct atNBPtuple *)cp);
}


#define HASHNAMESIZE 4096

struct hnamemem {
	u_int addr;
	char *name;
	struct hnamemem *nxt;
};

static struct hnamemem hnametable[HASHNAMESIZE];

static const char *
ataddr_string(netdissect_options *ndo,
              u_short atnet, u_char athost)
{
	struct hnamemem *tp, *tp2;
	u_int i = (atnet << 8) | athost;
	char nambuf[256+1];
	static int first = 1;
	FILE *fp;

	/*
	 * Are we doing address to name resolution?
	 */
	if (!ndo->ndo_nflag) {
		/*
		 * Yes.  Have we tried to open and read an AppleTalk
		 * number to name map file?
		 */
		if (!first) {
			/*
			 * No; try to do so.
			 */
			first = 0;
			fp = fopen("/etc/atalk.names", "r");
			if (fp != NULL) {
				char line[256];
				u_int i1, i2;

				while (fgets(line, sizeof(line), fp)) {
					if (line[0] == '\n' || line[0] == 0 ||
					    line[0] == '#')
						continue;
					if (sscanf(line, "%u.%u %256s", &i1,
					    &i2, nambuf) == 3)
						/* got a hostname. */
						i2 |= (i1 << 8);
					else if (sscanf(line, "%u %256s", &i1,
					    nambuf) == 2)
						/* got a net name */
						i2 = (i1 << 8) | 255;
					else
						continue;

					for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
					     tp->nxt; tp = tp->nxt)
						;
					tp->addr = i2;
					tp->nxt = newhnamemem(ndo);
					tp->name = strdup(nambuf);
					if (tp->name == NULL)
						(*ndo->ndo_error)(ndo,
						    S_ERR_ND_MEM_ALLOC,
						    "%s: strdup(nambuf)", __func__);
				}
				fclose(fp);
			}
		}
	}

	/*
	 * Now try to look up the address in the table.
	 */
	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
		if (tp->addr == i)
			return (tp->name);

	/* didn't have the node name -- see if we've got the net name */
	i |= 255;
	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
		if (tp2->addr == i) {
			tp->addr = (atnet << 8) | athost;
			tp->nxt = newhnamemem(ndo);
			(void)snprintf(nambuf, sizeof(nambuf), "%s.%u",
			    tp2->name, athost);
			tp->name = strdup(nambuf);
			if (tp->name == NULL)
				(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
					"%s: strdup(nambuf)", __func__);
			return (tp->name);
		}

	tp->addr = (atnet << 8) | athost;
	tp->nxt = newhnamemem(ndo);
	if (athost != 255)
		(void)snprintf(nambuf, sizeof(nambuf), "%u.%u", atnet, athost);
	else
		(void)snprintf(nambuf, sizeof(nambuf), "%u", atnet);
	tp->name = strdup(nambuf);
	if (tp->name == NULL)
		(*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
				  "%s: strdup(nambuf)", __func__);

	return (tp->name);
}

static const struct tok skt2str[] = {
	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
	{ nbpSkt,	"nis" },	/* name info socket */
	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
	{ zipSkt,	"zip" },	/* zone info protocol */
	{ 0,		NULL }
};

static const char *
ddpskt_string(netdissect_options *ndo,
              u_int skt)
{
	static char buf[8];

	if (ndo->ndo_nflag) {
		(void)snprintf(buf, sizeof(buf), "%u", skt);
		return (buf);
	}
	return (tok2str(skt2str, "%u", skt));
}