1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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 * Format and print AppleTalk packets.
22 *
23 * $FreeBSD$
24 */
25
26#ifndef lint
27static const char rcsid[] _U_ =
28    "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.81 2004-05-01 09:41:50 hannes Exp $ (LBL)";
29#endif
30
31#ifdef HAVE_CONFIG_H
32#include "config.h"
33#endif
34
35#include <tcpdump-stdinc.h>
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <pcap.h>
41
42#include "interface.h"
43#include "addrtoname.h"
44#include "ethertype.h"
45#include "extract.h"			/* must come after interface.h */
46#include "appletalk.h"
47
48static struct tok type2str[] = {
49	{ ddpRTMP,		"rtmp" },
50	{ ddpRTMPrequest,	"rtmpReq" },
51	{ ddpECHO,		"echo" },
52	{ ddpIP,		"IP" },
53	{ ddpARP,		"ARP" },
54	{ ddpKLAP,		"KLAP" },
55	{ 0,			NULL }
56};
57
58struct aarp {
59	u_int16_t	htype, ptype;
60	u_int8_t	halen, palen;
61	u_int16_t	op;
62	u_int8_t	hsaddr[6];
63	u_int8_t	psaddr[4];
64	u_int8_t	hdaddr[6];
65	u_int8_t	pdaddr[4];
66};
67
68static char tstr[] = "[|atalk]";
69
70static void atp_print(const struct atATP *, u_int);
71static void atp_bitmap_print(u_char);
72static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
73static const char *print_cstring(const char *, const u_char *);
74static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
75						const u_char *,
76						u_short, u_char, u_char);
77static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
78					       const u_char *);
79static const char *ataddr_string(u_short, u_char);
80static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
81static const char *ddpskt_string(int);
82
83/*
84 * Print LLAP packets received on a physical LocalTalk interface.
85 */
86u_int
87ltalk_if_print(const struct pcap_pkthdr *h, const u_char *p)
88{
89	return (llap_print(p, h->caplen));
90}
91
92/*
93 * Print AppleTalk LLAP packets.
94 */
95u_int
96llap_print(register const u_char *bp, u_int length)
97{
98	register const struct LAP *lp;
99	register const struct atDDP *dp;
100	register const struct atShortDDP *sdp;
101	u_short snet;
102	u_int hdrlen;
103
104	if (length < sizeof(*lp)) {
105		(void)printf(" [|llap %u]", length);
106		return (length);
107	}
108	lp = (const struct LAP *)bp;
109	bp += sizeof(*lp);
110	length -= sizeof(*lp);
111	hdrlen = sizeof(*lp);
112	switch (lp->type) {
113
114	case lapShortDDP:
115		if (length < ddpSSize) {
116			(void)printf(" [|sddp %u]", length);
117			return (length);
118		}
119		sdp = (const struct atShortDDP *)bp;
120		printf("%s.%s",
121		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
122		printf(" > %s.%s:",
123		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
124		bp += ddpSSize;
125		length -= ddpSSize;
126		hdrlen += ddpSSize;
127		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
128		break;
129
130	case lapDDP:
131		if (length < ddpSize) {
132			(void)printf(" [|ddp %u]", length);
133			return (length);
134		}
135		dp = (const struct atDDP *)bp;
136		snet = EXTRACT_16BITS(&dp->srcNet);
137		printf("%s.%s", ataddr_string(snet, dp->srcNode),
138		    ddpskt_string(dp->srcSkt));
139		printf(" > %s.%s:",
140		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
141		    ddpskt_string(dp->dstSkt));
142		bp += ddpSize;
143		length -= ddpSize;
144		hdrlen += ddpSize;
145		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
146		break;
147
148#ifdef notdef
149	case lapKLAP:
150		klap_print(bp, length);
151		break;
152#endif
153
154	default:
155		printf("%d > %d at-lap#%d %u",
156		    lp->src, lp->dst, lp->type, length);
157		break;
158	}
159	return (hdrlen);
160}
161
162/*
163 * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
164 * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
165 * packets in them).
166 */
167void
168atalk_print(register const u_char *bp, u_int length)
169{
170	register const struct atDDP *dp;
171	u_short snet;
172
173        if(!eflag)
174            printf("AT ");
175
176	if (length < ddpSize) {
177		(void)printf(" [|ddp %u]", length);
178		return;
179	}
180	dp = (const struct atDDP *)bp;
181	snet = EXTRACT_16BITS(&dp->srcNet);
182	printf("%s.%s", ataddr_string(snet, dp->srcNode),
183	       ddpskt_string(dp->srcSkt));
184	printf(" > %s.%s: ",
185	       ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
186	       ddpskt_string(dp->dstSkt));
187	bp += ddpSize;
188	length -= ddpSize;
189	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
190}
191
192/* XXX should probably pass in the snap header and do checks like arp_print() */
193void
194aarp_print(register const u_char *bp, u_int length)
195{
196	register const struct aarp *ap;
197
198#define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
199
200	printf("aarp ");
201	ap = (const struct aarp *)bp;
202	if (EXTRACT_16BITS(&ap->htype) == 1 &&
203	    EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
204	    ap->halen == 6 && ap->palen == 4 )
205		switch (EXTRACT_16BITS(&ap->op)) {
206
207		case 1:				/* request */
208			(void)printf("who-has %s tell %s",
209			    AT(pdaddr), AT(psaddr));
210			return;
211
212		case 2:				/* response */
213			(void)printf("reply %s is-at %s",
214			    AT(psaddr), etheraddr_string(ap->hsaddr));
215			return;
216
217		case 3:				/* probe (oy!) */
218			(void)printf("probe %s tell %s",
219			    AT(pdaddr), AT(psaddr));
220			return;
221		}
222	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
223	    length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
224	    EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
225}
226
227/*
228 * Print AppleTalk Datagram Delivery Protocol packets.
229 */
230static void
231ddp_print(register const u_char *bp, register u_int length, register int t,
232	  register u_short snet, register u_char snode, u_char skt)
233{
234
235	switch (t) {
236
237	case ddpNBP:
238		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
239		break;
240
241	case ddpATP:
242		atp_print((const struct atATP *)bp, length);
243		break;
244
245	case ddpEIGRP:
246		eigrp_print(bp, length);
247		break;
248
249	default:
250		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
251		break;
252	}
253}
254
255static void
256atp_print(register const struct atATP *ap, u_int length)
257{
258	char c;
259	u_int32_t data;
260
261	if ((const u_char *)(ap + 1) > snapend) {
262		/* Just bail if we don't have the whole chunk. */
263		fputs(tstr, stdout);
264		return;
265	}
266	if (length < sizeof(*ap)) {
267		(void)printf(" [|atp %u]", length);
268		return;
269	}
270	length -= sizeof(*ap);
271	switch (ap->control & 0xc0) {
272
273	case atpReqCode:
274		(void)printf(" atp-req%s %d",
275			     ap->control & atpXO? " " : "*",
276			     EXTRACT_16BITS(&ap->transID));
277
278		atp_bitmap_print(ap->bitmap);
279
280		if (length != 0)
281			(void)printf(" [len=%u]", length);
282
283		switch (ap->control & (atpEOM|atpSTS)) {
284		case atpEOM:
285			(void)printf(" [EOM]");
286			break;
287		case atpSTS:
288			(void)printf(" [STS]");
289			break;
290		case atpEOM|atpSTS:
291			(void)printf(" [EOM,STS]");
292			break;
293		}
294		break;
295
296	case atpRspCode:
297		(void)printf(" atp-resp%s%d:%d (%u)",
298			     ap->control & atpEOM? "*" : " ",
299			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
300		switch (ap->control & (atpXO|atpSTS)) {
301		case atpXO:
302			(void)printf(" [XO]");
303			break;
304		case atpSTS:
305			(void)printf(" [STS]");
306			break;
307		case atpXO|atpSTS:
308			(void)printf(" [XO,STS]");
309			break;
310		}
311		break;
312
313	case atpRelCode:
314		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
315
316		atp_bitmap_print(ap->bitmap);
317
318		/* length should be zero */
319		if (length)
320			(void)printf(" [len=%u]", length);
321
322		/* there shouldn't be any control flags */
323		if (ap->control & (atpXO|atpEOM|atpSTS)) {
324			c = '[';
325			if (ap->control & atpXO) {
326				(void)printf("%cXO", c);
327				c = ',';
328			}
329			if (ap->control & atpEOM) {
330				(void)printf("%cEOM", c);
331				c = ',';
332			}
333			if (ap->control & atpSTS) {
334				(void)printf("%cSTS", c);
335				c = ',';
336			}
337			(void)printf("]");
338		}
339		break;
340
341	default:
342		(void)printf(" atp-0x%x  %d (%u)", ap->control,
343			     EXTRACT_16BITS(&ap->transID), length);
344		break;
345	}
346	data = EXTRACT_32BITS(&ap->userData);
347	if (data != 0)
348		(void)printf(" 0x%x", data);
349}
350
351static void
352atp_bitmap_print(register u_char bm)
353{
354	register char c;
355	register int i;
356
357	/*
358	 * The '& 0xff' below is needed for compilers that want to sign
359	 * extend a u_char, which is the case with the Ultrix compiler.
360	 * (gcc is smart enough to eliminate it, at least on the Sparc).
361	 */
362	if ((bm + 1) & (bm & 0xff)) {
363		c = '<';
364		for (i = 0; bm; ++i) {
365			if (bm & 1) {
366				(void)printf("%c%d", c, i);
367				c = ',';
368			}
369			bm >>= 1;
370		}
371		(void)printf(">");
372	} else {
373		for (i = 0; bm; ++i)
374			bm >>= 1;
375		if (i > 1)
376			(void)printf("<0-%d>", i - 1);
377		else
378			(void)printf("<0>");
379	}
380}
381
382static void
383nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
384	  register u_char snode, register u_char skt)
385{
386	register const struct atNBPtuple *tp =
387		(const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
388	int i;
389	const u_char *ep;
390
391	if (length < nbpHeaderSize) {
392		(void)printf(" truncated-nbp %u", length);
393		return;
394	}
395
396	length -= nbpHeaderSize;
397	if (length < 8) {
398		/* must be room for at least one tuple */
399		(void)printf(" truncated-nbp %u", length + nbpHeaderSize);
400		return;
401	}
402	/* ep points to end of available data */
403	ep = snapend;
404	if ((const u_char *)tp > ep) {
405		fputs(tstr, stdout);
406		return;
407	}
408	switch (i = np->control & 0xf0) {
409
410	case nbpBrRq:
411	case nbpLkUp:
412		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
413			     np->id);
414		if ((const u_char *)(tp + 1) > ep) {
415			fputs(tstr, stdout);
416			return;
417		}
418		(void)nbp_name_print(tp, ep);
419		/*
420		 * look for anomalies: the spec says there can only
421		 * be one tuple, the address must match the source
422		 * address and the enumerator should be zero.
423		 */
424		if ((np->control & 0xf) != 1)
425			(void)printf(" [ntup=%d]", np->control & 0xf);
426		if (tp->enumerator)
427			(void)printf(" [enum=%d]", tp->enumerator);
428		if (EXTRACT_16BITS(&tp->net) != snet ||
429		    tp->node != snode || tp->skt != skt)
430			(void)printf(" [addr=%s.%d]",
431			    ataddr_string(EXTRACT_16BITS(&tp->net),
432			    tp->node), tp->skt);
433		break;
434
435	case nbpLkUpReply:
436		(void)printf(" nbp-reply %d:", np->id);
437
438		/* print each of the tuples in the reply */
439		for (i = np->control & 0xf; --i >= 0 && tp; )
440			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
441		break;
442
443	default:
444		(void)printf(" nbp-0x%x  %d (%u)", np->control, np->id,
445				length);
446		break;
447	}
448}
449
450/* print a counted string */
451static const char *
452print_cstring(register const char *cp, register const u_char *ep)
453{
454	register u_int length;
455
456	if (cp >= (const char *)ep) {
457		fputs(tstr, stdout);
458		return (0);
459	}
460	length = *cp++;
461
462	/* Spec says string can be at most 32 bytes long */
463	if (length > 32) {
464		(void)printf("[len=%u]", length);
465		return (0);
466	}
467	while ((int)--length >= 0) {
468		if (cp >= (const char *)ep) {
469			fputs(tstr, stdout);
470			return (0);
471		}
472		putchar(*cp++);
473	}
474	return (cp);
475}
476
477static const struct atNBPtuple *
478nbp_tuple_print(register const struct atNBPtuple *tp,
479		register const u_char *ep,
480		register u_short snet, register u_char snode,
481		register u_char skt)
482{
483	register const struct atNBPtuple *tpn;
484
485	if ((const u_char *)(tp + 1) > ep) {
486		fputs(tstr, stdout);
487		return 0;
488	}
489	tpn = nbp_name_print(tp, ep);
490
491	/* if the enumerator isn't 1, print it */
492	if (tp->enumerator != 1)
493		(void)printf("(%d)", tp->enumerator);
494
495	/* if the socket doesn't match the src socket, print it */
496	if (tp->skt != skt)
497		(void)printf(" %d", tp->skt);
498
499	/* if the address doesn't match the src address, it's an anomaly */
500	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
501		(void)printf(" [addr=%s]",
502		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
503
504	return (tpn);
505}
506
507static const struct atNBPtuple *
508nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
509{
510	register const char *cp = (const char *)tp + nbpTupleSize;
511
512	putchar(' ');
513
514	/* Object */
515	putchar('"');
516	if ((cp = print_cstring(cp, ep)) != NULL) {
517		/* Type */
518		putchar(':');
519		if ((cp = print_cstring(cp, ep)) != NULL) {
520			/* Zone */
521			putchar('@');
522			if ((cp = print_cstring(cp, ep)) != NULL)
523				putchar('"');
524		}
525	}
526	return ((const struct atNBPtuple *)cp);
527}
528
529
530#define HASHNAMESIZE 4096
531
532struct hnamemem {
533	int addr;
534	char *name;
535	struct hnamemem *nxt;
536};
537
538static struct hnamemem hnametable[HASHNAMESIZE];
539
540static const char *
541ataddr_string(u_short atnet, u_char athost)
542{
543	register struct hnamemem *tp, *tp2;
544	register int i = (atnet << 8) | athost;
545	char nambuf[MAXHOSTNAMELEN + 20];
546	static int first = 1;
547	FILE *fp;
548
549	/*
550	 * if this is the first call, see if there's an AppleTalk
551	 * number to name map file.
552	 */
553	if (first && (first = 0, !nflag)
554	    && (fp = fopen("/etc/atalk.names", "r"))) {
555		char line[256];
556		int i1, i2;
557
558		while (fgets(line, sizeof(line), fp)) {
559			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
560				continue;
561			if (sscanf(line, "%d.%d %256s", &i1, &i2, nambuf) == 3)
562				/* got a hostname. */
563				i2 |= (i1 << 8);
564			else if (sscanf(line, "%d %256s", &i1, nambuf) == 2)
565				/* got a net name */
566				i2 = (i1 << 8) | 255;
567			else
568				continue;
569
570			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
571			     tp->nxt; tp = tp->nxt)
572				;
573			tp->addr = i2;
574			tp->nxt = newhnamemem();
575			tp->name = strdup(nambuf);
576		}
577		fclose(fp);
578	}
579
580	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
581		if (tp->addr == i)
582			return (tp->name);
583
584	/* didn't have the node name -- see if we've got the net name */
585	i |= 255;
586	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
587		if (tp2->addr == i) {
588			tp->addr = (atnet << 8) | athost;
589			tp->nxt = newhnamemem();
590			(void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
591			    tp2->name, athost);
592			tp->name = strdup(nambuf);
593			return (tp->name);
594		}
595
596	tp->addr = (atnet << 8) | athost;
597	tp->nxt = newhnamemem();
598	if (athost != 255)
599		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet, athost);
600	else
601		(void)snprintf(nambuf, sizeof(nambuf), "%d", atnet);
602	tp->name = strdup(nambuf);
603
604	return (tp->name);
605}
606
607static struct tok skt2str[] = {
608	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
609	{ nbpSkt,	"nis" },	/* name info socket */
610	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
611	{ zipSkt,	"zip" },	/* zone info protocol */
612	{ 0,		NULL }
613};
614
615static const char *
616ddpskt_string(register int skt)
617{
618	static char buf[8];
619
620	if (nflag) {
621		(void)snprintf(buf, sizeof(buf), "%d", skt);
622		return (buf);
623	}
624	return (tok2str(skt2str, "%d", skt));
625}
626