print-atalk.c revision 26183 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
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
24#ifndef lint
25static const char rcsid[] =
26    "@(#) $Header: print-atalk.c,v 1.45 96/12/10 23:24:07 leres Exp $ (LBL)";
27#endif
28
29#include <sys/param.h>
30#include <sys/time.h>
31#include <sys/socket.h>
32
33#if __STDC__
34struct mbuf;
35struct rtentry;
36#endif
37#include <net/if.h>
38
39#include <netinet/in.h>
40#include <netinet/in_systm.h>
41#include <netinet/ip.h>
42#include <netinet/ip_var.h>
43#include <net/ethernet.h>
44#include <netinet/udp.h>
45#include <netinet/udp_var.h>
46#include <netinet/tcp.h>
47#include <netinet/tcpip.h>
48
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52
53#include "interface.h"
54#include "addrtoname.h"
55#include "ethertype.h"
56#include "extract.h"			/* must come after interface.h */
57#include "appletalk.h"
58
59static struct tok type2str[] = {
60	{ ddpRTMP,		"rtmp" },
61	{ ddpRTMPrequest,	"rtmpReq" },
62	{ ddpECHO,		"echo" },
63	{ ddpIP,		"IP" },
64	{ ddpARP,		"ARP" },
65	{ ddpKLAP,		"KLAP" },
66	{ 0,			NULL }
67};
68
69struct aarp {
70	u_short htype, ptype;
71	u_char	halen, palen;
72	u_short op;
73	u_char	hsaddr[6];
74	u_char	psaddr[4];
75	u_char	hdaddr[6];
76	u_char	pdaddr[4];
77};
78
79static char tstr[] = "[|atalk]";
80
81static void atp_print(const struct atATP *, u_int);
82static void atp_bitmap_print(u_char);
83static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
84static const char *print_cstring(const char *, const u_char *);
85static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
86						const u_char *,
87						u_short, u_char, u_char);
88static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
89					       const u_char *);
90static const char *ataddr_string(u_short, u_char);
91static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
92static const char *ddpskt_string(int);
93
94/*
95 * Print AppleTalk Datagram Delivery Protocol packets.
96 */
97void
98atalk_print(register const u_char *bp, u_int length)
99{
100	register const struct LAP *lp;
101	register const struct atDDP *dp;
102	register const struct atShortDDP *sdp;
103	u_short snet;
104
105#if 0
106	lp = (struct LAP *)bp;
107	bp += sizeof(*lp);
108	length -= sizeof(*lp);
109#else
110	{
111		static struct LAP lp_ = {0, 0, lapDDP};
112		lp = &lp_;
113	}
114#endif
115	switch (lp->type) {
116
117	case lapShortDDP:
118		if (length < ddpSSize) {
119			(void)printf(" [|sddp %d]", length);
120			return;
121		}
122		sdp = (const struct atShortDDP *)bp;
123		printf("%s.%s",
124		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
125		printf(" > %s.%s:",
126		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
127		bp += ddpSSize;
128		length -= ddpSSize;
129		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
130		break;
131
132	case lapDDP:
133		if (length < ddpSize) {
134			(void)printf(" [|ddp %d]", length);
135			return;
136		}
137		dp = (const struct atDDP *)bp;
138		snet = EXTRACT_16BITS(&dp->srcNet);
139		printf("%s.%s", ataddr_string(snet, dp->srcNode),
140		    ddpskt_string(dp->srcSkt));
141		printf(" > %s.%s:",
142		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
143		    ddpskt_string(dp->dstSkt));
144		bp += ddpSize;
145		length -= ddpSize;
146		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
147		break;
148
149#ifdef notdef
150	case lapKLAP:
151		klap_print(bp, length);
152		break;
153#endif
154
155	default:
156		printf("%d > %d at-lap#%d %d",
157		    lp->src, lp->dst, lp->type, length);
158		break;
159	}
160}
161
162/* XXX should probably pass in the snap header and do checks like arp_print() */
163void
164aarp_print(register const u_char *bp, u_int length)
165{
166	register const struct aarp *ap;
167
168#define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
169
170	printf("aarp ");
171	ap = (const struct aarp *)bp;
172	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
173	    ap->halen == 6 && ap->palen == 4 )
174		switch (ntohs(ap->op)) {
175
176		case 1:				/* request */
177			(void)printf("who-has %s tell %s",
178			    AT(pdaddr), AT(psaddr));
179			return;
180
181		case 2:				/* response */
182			(void)printf("reply %s is-at %s",
183			    AT(psaddr), etheraddr_string(ap->hsaddr));
184			return;
185
186		case 3:				/* probe (oy!) */
187			(void)printf("probe %s tell %s",
188			    AT(pdaddr), AT(psaddr));
189			return;
190		}
191	(void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
192	    length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
193}
194
195static void
196ddp_print(register const u_char *bp, register u_int length, register int t,
197	  register u_short snet, register u_char snode, u_char skt)
198{
199
200	switch (t) {
201
202	case ddpNBP:
203		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
204		break;
205
206	case ddpATP:
207		atp_print((const struct atATP *)bp, length);
208		break;
209
210	default:
211		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
212		break;
213	}
214}
215
216static void
217atp_print(register const struct atATP *ap, u_int length)
218{
219	char c;
220	u_int32_t data;
221
222	if ((const u_char *)(ap + 1) > snapend) {
223		/* Just bail if we don't have the whole chunk. */
224		fputs(tstr, stdout);
225		return;
226	}
227	length -= sizeof(*ap);
228	switch (ap->control & 0xc0) {
229
230	case atpReqCode:
231		(void)printf(" atp-req%s %d",
232			     ap->control & atpXO? " " : "*",
233			     EXTRACT_16BITS(&ap->transID));
234
235		atp_bitmap_print(ap->bitmap);
236
237		if (length != 0)
238			(void)printf(" [len=%d]", length);
239
240		switch (ap->control & (atpEOM|atpSTS)) {
241		case atpEOM:
242			(void)printf(" [EOM]");
243			break;
244		case atpSTS:
245			(void)printf(" [STS]");
246			break;
247		case atpEOM|atpSTS:
248			(void)printf(" [EOM,STS]");
249			break;
250		}
251		break;
252
253	case atpRspCode:
254		(void)printf(" atp-resp%s%d:%d (%d)",
255			     ap->control & atpEOM? "*" : " ",
256			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
257		switch (ap->control & (atpXO|atpSTS)) {
258		case atpXO:
259			(void)printf(" [XO]");
260			break;
261		case atpSTS:
262			(void)printf(" [STS]");
263			break;
264		case atpXO|atpSTS:
265			(void)printf(" [XO,STS]");
266			break;
267		}
268		break;
269
270	case atpRelCode:
271		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
272
273		atp_bitmap_print(ap->bitmap);
274
275		/* length should be zero */
276		if (length)
277			(void)printf(" [len=%d]", length);
278
279		/* there shouldn't be any control flags */
280		if (ap->control & (atpXO|atpEOM|atpSTS)) {
281			c = '[';
282			if (ap->control & atpXO) {
283				(void)printf("%cXO", c);
284				c = ',';
285			}
286			if (ap->control & atpEOM) {
287				(void)printf("%cEOM", c);
288				c = ',';
289			}
290			if (ap->control & atpSTS) {
291				(void)printf("%cSTS", c);
292				c = ',';
293			}
294			(void)printf("]");
295		}
296		break;
297
298	default:
299		(void)printf(" atp-0x%x  %d (%d)", ap->control,
300			     EXTRACT_16BITS(&ap->transID), length);
301		break;
302	}
303	data = EXTRACT_32BITS(&ap->userData);
304	if (data != 0)
305		(void)printf(" 0x%x", data);
306}
307
308static void
309atp_bitmap_print(register u_char bm)
310{
311	register char c;
312	register int i;
313
314	/*
315	 * The '& 0xff' below is needed for compilers that want to sign
316	 * extend a u_char, which is the case with the Ultrix compiler.
317	 * (gcc is smart enough to eliminate it, at least on the Sparc).
318	 */
319	if ((bm + 1) & (bm & 0xff)) {
320		c = '<';
321		for (i = 0; bm; ++i) {
322			if (bm & 1) {
323				(void)printf("%c%d", c, i);
324				c = ',';
325			}
326			bm >>= 1;
327		}
328		(void)printf(">");
329	} else {
330		for (i = 0; bm; ++i)
331			bm >>= 1;
332		if (i > 1)
333			(void)printf("<0-%d>", i - 1);
334		else
335			(void)printf("<0>");
336	}
337}
338
339static void
340nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
341	  register u_char snode, register u_char skt)
342{
343	register const struct atNBPtuple *tp =
344			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
345	int i;
346	const u_char *ep;
347
348	length -= nbpHeaderSize;
349	if (length < 8) {
350		/* must be room for at least one tuple */
351		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
352		return;
353	}
354	/* ep points to end of available data */
355	ep = snapend;
356	if ((const u_char *)tp > ep) {
357		fputs(tstr, stdout);
358		return;
359	}
360	switch (i = np->control & 0xf0) {
361
362	case nbpBrRq:
363	case nbpLkUp:
364		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
365			     np->id);
366		if ((const u_char *)(tp + 1) > ep) {
367			fputs(tstr, stdout);
368			return;
369		}
370		(void)nbp_name_print(tp, ep);
371		/*
372		 * look for anomalies: the spec says there can only
373		 * be one tuple, the address must match the source
374		 * address and the enumerator should be zero.
375		 */
376		if ((np->control & 0xf) != 1)
377			(void)printf(" [ntup=%d]", np->control & 0xf);
378		if (tp->enumerator)
379			(void)printf(" [enum=%d]", tp->enumerator);
380		if (EXTRACT_16BITS(&tp->net) != snet ||
381		    tp->node != snode || tp->skt != skt)
382			(void)printf(" [addr=%s.%d]",
383			    ataddr_string(EXTRACT_16BITS(&tp->net),
384			    tp->node), tp->skt);
385		break;
386
387	case nbpLkUpReply:
388		(void)printf(" nbp-reply %d:", np->id);
389
390		/* print each of the tuples in the reply */
391		for (i = np->control & 0xf; --i >= 0 && tp; )
392			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
393		break;
394
395	default:
396		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
397				length);
398		break;
399	}
400}
401
402/* print a counted string */
403static const char *
404print_cstring(register const char *cp, register const u_char *ep)
405{
406	register u_int length;
407
408	if (cp >= (const char *)ep) {
409		fputs(tstr, stdout);
410		return (0);
411	}
412	length = *cp++;
413
414	/* Spec says string can be at most 32 bytes long */
415	if (length < 0 || length > 32) {
416		(void)printf("[len=%d]", length);
417		return (0);
418	}
419	while (--length >= 0) {
420		if (cp >= (char *)ep) {
421			fputs(tstr, stdout);
422			return (0);
423		}
424		putchar(*cp++);
425	}
426	return (cp);
427}
428
429static const struct atNBPtuple *
430nbp_tuple_print(register const struct atNBPtuple *tp,
431		register const u_char *ep,
432		register u_short snet, register u_char snode,
433		register u_char skt)
434{
435	register const struct atNBPtuple *tpn;
436
437	if ((const u_char *)(tp + 1) > ep) {
438		fputs(tstr, stdout);
439		return 0;
440	}
441	tpn = nbp_name_print(tp, ep);
442
443	/* if the enumerator isn't 1, print it */
444	if (tp->enumerator != 1)
445		(void)printf("(%d)", tp->enumerator);
446
447	/* if the socket doesn't match the src socket, print it */
448	if (tp->skt != skt)
449		(void)printf(" %d", tp->skt);
450
451	/* if the address doesn't match the src address, it's an anomaly */
452	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
453		(void)printf(" [addr=%s]",
454		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
455
456	return (tpn);
457}
458
459static const struct atNBPtuple *
460nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
461{
462	register const char *cp = (const char *)tp + nbpTupleSize;
463
464	putchar(' ');
465
466	/* Object */
467	putchar('"');
468	if ((cp = print_cstring(cp, ep)) != NULL) {
469		/* Type */
470		putchar(':');
471		if ((cp = print_cstring(cp, ep)) != NULL) {
472			/* Zone */
473			putchar('@');
474			if ((cp = print_cstring(cp, ep)) != NULL)
475				putchar('"');
476		}
477	}
478	return ((const struct atNBPtuple *)cp);
479}
480
481
482#define HASHNAMESIZE 4096
483
484struct hnamemem {
485	int addr;
486	char *name;
487	struct hnamemem *nxt;
488};
489
490static struct hnamemem hnametable[HASHNAMESIZE];
491
492static const char *
493ataddr_string(u_short atnet, u_char athost)
494{
495	register struct hnamemem *tp, *tp2;
496	register int i = (atnet << 8) | athost;
497	char nambuf[256];
498	static int first = 1;
499	FILE *fp;
500
501	/*
502	 * if this is the first call, see if there's an AppleTalk
503	 * number to name map file.
504	 */
505	if (first && (first = 0, !nflag)
506	    && (fp = fopen("/etc/atalk.names", "r"))) {
507		char line[256];
508		int i1, i2;
509
510		while (fgets(line, sizeof(line), fp)) {
511			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
512				continue;
513			if (sscanf(line, "%d.%d %s", &i1, &i2, nambuf) == 3)
514				/* got a hostname. */
515				i2 |= (i1 << 8);
516			else if (sscanf(line, "%d %s", &i1, nambuf) == 2)
517				/* got a net name */
518				i2 = (i1 << 8) | 255;
519			else
520				continue;
521
522			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
523			     tp->nxt; tp = tp->nxt)
524				;
525			tp->addr = i2;
526			tp->nxt = newhnamemem();
527			tp->name = savestr(nambuf);
528		}
529		fclose(fp);
530	}
531
532	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
533		if (tp->addr == i)
534			return (tp->name);
535
536	/* didn't have the node name -- see if we've got the net name */
537	i |= 255;
538	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
539		if (tp2->addr == i) {
540			tp->addr = (atnet << 8) | athost;
541			tp->nxt = newhnamemem();
542			(void)sprintf(nambuf, "%s.%d", tp2->name, athost);
543			tp->name = savestr(nambuf);
544			return (tp->name);
545		}
546
547	tp->addr = (atnet << 8) | athost;
548	tp->nxt = newhnamemem();
549	if (athost != 255)
550		(void)sprintf(nambuf, "%d.%d", atnet, athost);
551	else
552		(void)sprintf(nambuf, "%d", atnet);
553	tp->name = savestr(nambuf);
554
555	return (tp->name);
556}
557
558static struct tok skt2str[] = {
559	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
560	{ nbpSkt,	"nis" },	/* name info socket */
561	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
562	{ zipSkt,	"zip" },	/* zone info protocol */
563	{ 0,		NULL }
564};
565
566static const char *
567ddpskt_string(register int skt)
568{
569	static char buf[8];
570
571	if (nflag) {
572		(void)sprintf(buf, "%d", skt);
573		return (buf);
574	}
575	return (tok2str(skt2str, "%d", skt));
576}
577