xref: /freebsd/contrib/tcpdump/print-token.c (revision acd3428b7d3e94cef0e1881c868cb4b131d4ff41)
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  * Hacked version of print-ether.c  Larry Lile <lile@stdio.com>
22  *
23  * Further tweaked to more closely resemble print-fddi.c
24  *	Guy Harris <guy@alum.mit.edu>
25  *
26  * $FreeBSD$
27  */
28 #ifndef lint
29 static const char rcsid[] _U_ =
30     "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.25.2.1 2005/07/07 01:24:40 guy Exp $";
31 #endif
32 
33 #ifdef HAVE_CONFIG_H
34 #include "config.h"
35 #endif
36 
37 #include <tcpdump-stdinc.h>
38 
39 #include <pcap.h>
40 #include <stdio.h>
41 #include <string.h>
42 
43 #include "interface.h"
44 #include "addrtoname.h"
45 #include "ethertype.h"
46 
47 #include "ether.h"
48 #include "token.h"
49 
50 /* Extract src, dst addresses */
51 static inline void
52 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
53 {
54 	memcpy(fdst, (const char *)trp->token_dhost, 6);
55 	memcpy(fsrc, (const char *)trp->token_shost, 6);
56 }
57 
58 /*
59  * Print the TR MAC header
60  */
61 static inline void
62 token_hdr_print(register const struct token_header *trp, register u_int length,
63 	   register const u_char *fsrc, register const u_char *fdst)
64 {
65 	const char *srcname, *dstname;
66 
67 	srcname = etheraddr_string(fsrc);
68 	dstname = etheraddr_string(fdst);
69 
70 	if (vflag)
71 		(void) printf("%02x %02x %s %s %d: ",
72 		       trp->token_ac,
73 		       trp->token_fc,
74 		       srcname, dstname,
75 		       length);
76 	else
77 		printf("%s %s %d: ", srcname, dstname, length);
78 }
79 
80 static const char *broadcast_indicator[] = {
81 	"Non-Broadcast", "Non-Broadcast",
82 	"Non-Broadcast", "Non-Broadcast",
83 	"All-routes",    "All-routes",
84 	"Single-route",  "Single-route"
85 };
86 
87 static const char *direction[] = {
88 	"Forward", "Backward"
89 };
90 
91 static const char *largest_frame[] = {
92 	"516",
93 	"1500",
94 	"2052",
95 	"4472",
96 	"8144",
97 	"11407",
98 	"17800",
99 	"??"
100 };
101 
102 u_int
103 token_print(const u_char *p, u_int length, u_int caplen)
104 {
105 	const struct token_header *trp;
106 	u_short extracted_ethertype;
107 	struct ether_header ehdr;
108 	u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
109 	int seg;
110 
111 	trp = (const struct token_header *)p;
112 
113 	if (caplen < TOKEN_HDRLEN) {
114 		printf("[|token-ring]");
115 		return hdr_len;
116 	}
117 
118 	/*
119 	 * Get the TR addresses into a canonical form
120 	 */
121 	extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
122 
123 	/* Adjust for source routing information in the MAC header */
124 	if (IS_SOURCE_ROUTED(trp)) {
125 		/* Clear source-routed bit */
126 		*ESRC(&ehdr) &= 0x7f;
127 
128 		if (eflag)
129 			token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
130 
131 		route_len = RIF_LENGTH(trp);
132 		if (vflag) {
133 			printf("%s ", broadcast_indicator[BROADCAST(trp)]);
134 			printf("%s", direction[DIRECTION(trp)]);
135 
136 			for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
137 				printf(" [%d:%d]", RING_NUMBER(trp, seg),
138 				    BRIDGE_NUMBER(trp, seg));
139 		} else {
140 			printf("rt = %x", ntohs(trp->token_rcf));
141 
142 			for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
143 				printf(":%x", ntohs(trp->token_rseg[seg]));
144 		}
145 		printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
146 	} else {
147 		if (eflag)
148 			token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
149 	}
150 
151 	/* Skip over token ring MAC header and routing information */
152 	hdr_len += route_len;
153 	length -= hdr_len;
154 	p += hdr_len;
155 	caplen -= hdr_len;
156 
157 	/* Frame Control field determines interpretation of packet */
158 	extracted_ethertype = 0;
159 	if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
160 		/* Try to print the LLC-layer header & higher layers */
161 		if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
162 		    &extracted_ethertype) == 0) {
163 			/* ether_type not known, print raw packet */
164 			if (!eflag)
165 				token_hdr_print(trp,
166 				    length + TOKEN_HDRLEN + route_len,
167 				    ESRC(&ehdr), EDST(&ehdr));
168 			if (extracted_ethertype) {
169 				printf("(LLC %s) ",
170 			etherproto_string(htons(extracted_ethertype)));
171 			}
172 			if (!suppress_default_print)
173 				default_print(p, caplen);
174 		}
175 	} else {
176 		/* Some kinds of TR packet we cannot handle intelligently */
177 		/* XXX - dissect MAC packets if frame type is 0 */
178 		if (!eflag)
179 			token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
180 			    ESRC(&ehdr), EDST(&ehdr));
181 		if (!suppress_default_print)
182 			default_print(p, caplen);
183 	}
184 	return (hdr_len);
185 }
186 
187 /*
188  * This is the top level routine of the printer.  'p' points
189  * to the TR header of the packet, 'h->ts' is the timestamp,
190  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
191  * is the number of bytes actually captured.
192  */
193 u_int
194 token_if_print(const struct pcap_pkthdr *h, const u_char *p)
195 {
196 	return (token_print(p, h->len, h->caplen));
197 }
198