xref: /freebsd/contrib/tcpdump/print-arcnet.c (revision 8d20be1e22095c27faf8fe8b2f0d089739cc742e)
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  * From: NetBSD: print-arcnet.c,v 1.2 2000/04/24 13:02:28 itojun Exp
22  */
23 #ifndef lint
24 static const char rcsid[] _U_ =
25     "@(#) $Header: /tcpdump/master/tcpdump/print-arcnet.c,v 1.20 2005-04-06 21:32:38 mcr Exp $ (LBL)";
26 #endif
27 
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31 
32 #include <tcpdump-stdinc.h>
33 
34 #include <stdio.h>
35 #include <pcap.h>
36 
37 #include "interface.h"
38 #include "extract.h"
39 #include "arcnet.h"
40 
41 static int arcnet_encap_print(u_char arctype, const u_char *p,
42     u_int length, u_int caplen);
43 
44 struct tok arctypemap[] = {
45 	{ ARCTYPE_IP_OLD,	"oldip" },
46 	{ ARCTYPE_ARP_OLD,	"oldarp" },
47 	{ ARCTYPE_IP,		"ip" },
48 	{ ARCTYPE_ARP,		"arp" },
49 	{ ARCTYPE_REVARP,	"rarp" },
50 	{ ARCTYPE_ATALK,	"atalk" },
51 	{ ARCTYPE_BANIAN,	"banyan" },
52 	{ ARCTYPE_IPX,		"ipx" },
53 	{ ARCTYPE_INET6,	"ipv6" },
54 	{ ARCTYPE_DIAGNOSE,	"diag" },
55 	{ 0, 0 }
56 };
57 
58 static inline void
59 arcnet_print(const u_char *bp, u_int length, int phds, int flag, u_int seqid)
60 {
61 	const struct arc_header *ap;
62 	const char *arctypename;
63 
64 
65 	ap = (const struct arc_header *)bp;
66 
67 
68 	if (qflag) {
69 		(void)printf("%02x %02x %d: ",
70 			     ap->arc_shost,
71 			     ap->arc_dhost,
72 			     length);
73 		return;
74 	}
75 
76 	arctypename = tok2str(arctypemap, "%02x", ap->arc_type);
77 
78 	if (!phds) {
79 		(void)printf("%02x %02x %s %d: ",
80 			     ap->arc_shost, ap->arc_dhost, arctypename,
81 			     length);
82 			     return;
83 	}
84 
85 	if (flag == 0) {
86 		(void)printf("%02x %02x %s seqid %04x %d: ",
87 			ap->arc_shost, ap->arc_dhost, arctypename, seqid,
88 			length);
89 			return;
90 	}
91 
92 	if (flag & 1)
93 		(void)printf("%02x %02x %s seqid %04x "
94 			"(first of %d fragments) %d: ",
95 			ap->arc_shost, ap->arc_dhost, arctypename, seqid,
96 			(flag + 3) / 2, length);
97 	else
98 		(void)printf("%02x %02x %s seqid %04x "
99 			"(fragment %d) %d: ",
100 			ap->arc_shost, ap->arc_dhost, arctypename, seqid,
101 			flag/2 + 1, length);
102 }
103 
104 /*
105  * This is the top level routine of the printer.  'p' points
106  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
107  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
108  * is the number of bytes actually captured.
109  */
110 u_int
111 arcnet_if_print(const struct pcap_pkthdr *h, const u_char *p)
112 {
113 	u_int caplen = h->caplen;
114 	u_int length = h->len;
115 	const struct arc_header *ap;
116 
117 	int phds, flag = 0, archdrlen = 0;
118 	u_int seqid = 0;
119 	u_char arc_type;
120 
121 	if (caplen < ARC_HDRLEN) {
122 		printf("[|arcnet]");
123 		return (caplen);
124 	}
125 
126 	ap = (const struct arc_header *)p;
127 	arc_type = ap->arc_type;
128 
129 	switch (arc_type) {
130 	default:
131 		phds = 1;
132 		break;
133 	case ARCTYPE_IP_OLD:
134 	case ARCTYPE_ARP_OLD:
135 	case ARCTYPE_DIAGNOSE:
136 		phds = 0;
137 		archdrlen = ARC_HDRLEN;
138 		break;
139 	}
140 
141 	if (phds) {
142 		if (caplen < ARC_HDRNEWLEN) {
143 			arcnet_print(p, length, 0, 0, 0);
144 			printf("[|phds]");
145 			return (caplen);
146 		}
147 
148 		if (ap->arc_flag == 0xff) {
149 			if (caplen < ARC_HDRNEWLEN_EXC) {
150 				arcnet_print(p, length, 0, 0, 0);
151 				printf("[|phds extended]");
152 				return (caplen);
153 			}
154 			flag = ap->arc_flag2;
155 			seqid = EXTRACT_16BITS(&ap->arc_seqid2);
156 			archdrlen = ARC_HDRNEWLEN_EXC;
157 		} else {
158 			flag = ap->arc_flag;
159 			seqid = EXTRACT_16BITS(&ap->arc_seqid);
160 			archdrlen = ARC_HDRNEWLEN;
161 		}
162 	}
163 
164 
165 	if (eflag)
166 		arcnet_print(p, length, phds, flag, seqid);
167 
168 	/*
169 	 * Go past the ARCNET header.
170 	 */
171 	length -= archdrlen;
172 	caplen -= archdrlen;
173 	p += archdrlen;
174 
175 	if (phds && flag && (flag & 1) == 0) {
176 		/*
177 		 * This is a middle fragment.
178 		 */
179 		return (archdrlen);
180 	}
181 
182 	if (!arcnet_encap_print(arc_type, p, length, caplen))
183 		default_print(p, caplen);
184 
185 	return (archdrlen);
186 }
187 
188 /*
189  * This is the top level routine of the printer.  'p' points
190  * to the ARCNET header of the packet, 'h->ts' is the timestamp,
191  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
192  * is the number of bytes actually captured.  It is quite similar
193  * to the non-Linux style printer except that Linux doesn't ever
194  * supply packets that look like exception frames, it always supplies
195  * reassembled packets rather than raw frames, and headers have an
196  * extra "offset" field between the src/dest and packet type.
197  */
198 u_int
199 arcnet_linux_if_print(const struct pcap_pkthdr *h, const u_char *p)
200 {
201 	u_int caplen = h->caplen;
202 	u_int length = h->len;
203 	const struct arc_linux_header *ap;
204 
205 	int archdrlen = 0;
206 	u_char arc_type;
207 
208 	if (caplen < ARC_LINUX_HDRLEN) {
209 		printf("[|arcnet]");
210 		return (caplen);
211 	}
212 
213 	ap = (const struct arc_linux_header *)p;
214 	arc_type = ap->arc_type;
215 
216 	switch (arc_type) {
217 	default:
218 		archdrlen = ARC_LINUX_HDRNEWLEN;
219 		if (caplen < ARC_LINUX_HDRNEWLEN) {
220 			printf("[|arcnet]");
221 			return (caplen);
222 		}
223 		break;
224 	case ARCTYPE_IP_OLD:
225 	case ARCTYPE_ARP_OLD:
226 	case ARCTYPE_DIAGNOSE:
227 		archdrlen = ARC_LINUX_HDRLEN;
228 		break;
229 	}
230 
231 	if (eflag)
232 		arcnet_print(p, length, 0, 0, 0);
233 
234 	/*
235 	 * Go past the ARCNET header.
236 	 */
237 	length -= archdrlen;
238 	caplen -= archdrlen;
239 	p += archdrlen;
240 
241 	if (!arcnet_encap_print(arc_type, p, length, caplen))
242 		default_print(p, caplen);
243 
244 	return (archdrlen);
245 }
246 
247 /*
248  * Prints the packet encapsulated in an ARCnet data field,
249  * given the ARCnet system code.
250  *
251  * Returns non-zero if it can do so, zero if the system code is unknown.
252  */
253 
254 
255 static int
256 arcnet_encap_print(u_char arctype, const u_char *p,
257     u_int length, u_int caplen)
258 {
259 	switch (arctype) {
260 
261 	case ARCTYPE_IP_OLD:
262 	case ARCTYPE_IP:
263 	        ip_print(gndo, p, length);
264 		return (1);
265 
266 #ifdef INET6
267 	case ARCTYPE_INET6:
268 		ip6_print(gndo, p, length);
269 		return (1);
270 #endif /*INET6*/
271 
272 	case ARCTYPE_ARP_OLD:
273 	case ARCTYPE_ARP:
274 	case ARCTYPE_REVARP:
275 		arp_print(gndo, p, length, caplen);
276 		return (1);
277 
278 	case ARCTYPE_ATALK:	/* XXX was this ever used? */
279 		if (vflag)
280 			fputs("et1 ", stdout);
281 		atalk_print(p, length);
282 		return (1);
283 
284 	case ARCTYPE_IPX:
285 		ipx_print(p, length);
286 		return (1);
287 
288 	default:
289 		return (0);
290 	}
291 }
292 
293 /*
294  * Local Variables:
295  * c-style: bsd
296  * End:
297  */
298 
299