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 #ifndef lint
27 static const char rcsid[] _U_ =
28 "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.27 2005-11-13 12:12:43 guy Exp $";
29 #endif
30
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34
35 #include <tcpdump-stdinc.h>
36
37 #include <pcap.h>
38 #include <stdio.h>
39 #include <string.h>
40
41 #include "interface.h"
42 #include "extract.h"
43 #include "addrtoname.h"
44 #include "ethertype.h"
45
46 #include "ether.h"
47 #include "token.h"
48
49 /* Extract src, dst addresses */
50 static inline void
extract_token_addrs(const struct token_header * trp,char * fsrc,char * fdst)51 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
52 {
53 memcpy(fdst, (const char *)trp->token_dhost, 6);
54 memcpy(fsrc, (const char *)trp->token_shost, 6);
55 }
56
57 /*
58 * Print the TR MAC header
59 */
60 static inline void
token_hdr_print(register const struct token_header * trp,register u_int length,register const u_char * fsrc,register const u_char * fdst)61 token_hdr_print(register const struct token_header *trp, register u_int length,
62 register const u_char *fsrc, register const u_char *fdst)
63 {
64 const char *srcname, *dstname;
65
66 srcname = etheraddr_string(fsrc);
67 dstname = etheraddr_string(fdst);
68
69 if (vflag)
70 (void) printf("%02x %02x %s %s %d: ",
71 trp->token_ac,
72 trp->token_fc,
73 srcname, dstname,
74 length);
75 else
76 printf("%s %s %d: ", srcname, dstname, length);
77 }
78
79 static const char *broadcast_indicator[] = {
80 "Non-Broadcast", "Non-Broadcast",
81 "Non-Broadcast", "Non-Broadcast",
82 "All-routes", "All-routes",
83 "Single-route", "Single-route"
84 };
85
86 static const char *direction[] = {
87 "Forward", "Backward"
88 };
89
90 static const char *largest_frame[] = {
91 "516",
92 "1500",
93 "2052",
94 "4472",
95 "8144",
96 "11407",
97 "17800",
98 "??"
99 };
100
101 u_int
token_print(const u_char * p,u_int length,u_int caplen)102 token_print(const u_char *p, u_int length, u_int caplen)
103 {
104 const struct token_header *trp;
105 u_short extracted_ethertype;
106 struct ether_header ehdr;
107 u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
108 int seg;
109
110 trp = (const struct token_header *)p;
111
112 if (caplen < TOKEN_HDRLEN) {
113 printf("[|token-ring]");
114 return hdr_len;
115 }
116
117 /*
118 * Get the TR addresses into a canonical form
119 */
120 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));
121
122 /* Adjust for source routing information in the MAC header */
123 if (IS_SOURCE_ROUTED(trp)) {
124 /* Clear source-routed bit */
125 *ESRC(&ehdr) &= 0x7f;
126
127 if (eflag)
128 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
129
130 if (caplen < TOKEN_HDRLEN + 2) {
131 printf("[|token-ring]");
132 return hdr_len;
133 }
134 route_len = RIF_LENGTH(trp);
135 hdr_len += route_len;
136 if (caplen < hdr_len) {
137 printf("[|token-ring]");
138 return hdr_len;
139 }
140 if (vflag) {
141 printf("%s ", broadcast_indicator[BROADCAST(trp)]);
142 printf("%s", direction[DIRECTION(trp)]);
143
144 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
145 printf(" [%d:%d]", RING_NUMBER(trp, seg),
146 BRIDGE_NUMBER(trp, seg));
147 } else {
148 printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf));
149
150 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
151 printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg]));
152 }
153 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
154 } else {
155 if (eflag)
156 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
157 }
158
159 /* Skip over token ring MAC header and routing information */
160 length -= hdr_len;
161 p += hdr_len;
162 caplen -= hdr_len;
163
164 /* Frame Control field determines interpretation of packet */
165 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
166 /* Try to print the LLC-layer header & higher layers */
167 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
168 &extracted_ethertype) == 0) {
169 /* ether_type not known, print raw packet */
170 if (!eflag)
171 token_hdr_print(trp,
172 length + TOKEN_HDRLEN + route_len,
173 ESRC(&ehdr), EDST(&ehdr));
174 if (extracted_ethertype) {
175 printf("(LLC %s) ",
176 etherproto_string(htons(extracted_ethertype)));
177 }
178 if (!suppress_default_print)
179 default_print(p, caplen);
180 }
181 } else {
182 /* Some kinds of TR packet we cannot handle intelligently */
183 /* XXX - dissect MAC packets if frame type is 0 */
184 if (!eflag)
185 token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
186 ESRC(&ehdr), EDST(&ehdr));
187 if (!suppress_default_print)
188 default_print(p, caplen);
189 }
190 return (hdr_len);
191 }
192
193 /*
194 * This is the top level routine of the printer. 'p' points
195 * to the TR header of the packet, 'h->ts' is the timestamp,
196 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
197 * is the number of bytes actually captured.
198 */
199 u_int
token_if_print(const struct pcap_pkthdr * h,const u_char * p)200 token_if_print(const struct pcap_pkthdr *h, const u_char *p)
201 {
202 return (token_print(p, h->len, h->caplen));
203 }
204