summaryrefslogtreecommitdiffstats
path: root/contrib/tcpdump/print-token.c
blob: 3f8e215c64e46bb156593e1bf5dd93a7c57a0feb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Hacked version of print-ether.c  Larry Lile <lile@stdio.com>
 *
 * Further tweaked to more closely resemble print-fddi.c
 *	Guy Harris <guy@alum.mit.edu>
 *
 * $FreeBSD$
 */
#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.25 2004/03/17 23:24:38 guy Exp $";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <pcap.h>
#include <stdio.h>
#include <string.h>

#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"

#include "ether.h"
#include "token.h"

/* Extract src, dst addresses */
static inline void
extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst)
{
	memcpy(fdst, (const char *)trp->token_dhost, 6);
	memcpy(fsrc, (const char *)trp->token_shost, 6);
}

/*
 * Print the TR MAC header
 */
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)
{
	const char *srcname, *dstname;

	srcname = etheraddr_string(fsrc);
	dstname = etheraddr_string(fdst);

	if (vflag)
		(void) printf("%02x %02x %s %s %d: ",
		       trp->token_ac,
		       trp->token_fc,
		       srcname, dstname,
		       length);
	else
		printf("%s %s %d: ", srcname, dstname, length);
}

static const char *broadcast_indicator[] = {
	"Non-Broadcast", "Non-Broadcast",
	"Non-Broadcast", "Non-Broadcast",
	"All-routes",    "All-routes",
	"Single-route",  "Single-route"
};

static const char *direction[] = {
	"Forward", "Backward"
};

static const char *largest_frame[] = {
	"516",
	"1500",
	"2052",
	"4472",
	"8144",
	"11407",
	"17800",
	"??"
};

u_int
token_print(const u_char *p, u_int length, u_int caplen)
{
	const struct token_header *trp;
	u_short extracted_ethertype;
	struct ether_header ehdr;
	u_int route_len = 0, hdr_len = TOKEN_HDRLEN;
	int seg;

	trp = (const struct token_header *)p;

	if (caplen < TOKEN_HDRLEN) {
		printf("[|token-ring]");
		return hdr_len;
	}

	/*
	 * Get the TR addresses into a canonical form
	 */
	extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr));

	/* Adjust for source routing information in the MAC header */
	if (IS_SOURCE_ROUTED(trp)) {
		/* Clear source-routed bit */
		*ESRC(&ehdr) &= 0x7f;

		if (eflag)
			token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));

		route_len = RIF_LENGTH(trp);
		if (vflag) {
			printf("%s ", broadcast_indicator[BROADCAST(trp)]);
			printf("%s", direction[DIRECTION(trp)]);

			for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
				printf(" [%d:%d]", RING_NUMBER(trp, seg),
				    BRIDGE_NUMBER(trp, seg));
		} else {
			printf("rt = %x", ntohs(trp->token_rcf));

			for (seg = 0; seg < SEGMENT_COUNT(trp); seg++)
				printf(":%x", ntohs(trp->token_rseg[seg]));
		}
		printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]);
	} else {
		if (eflag)
			token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr));
	}

	/* Skip over token ring MAC header and routing information */
	hdr_len += route_len;
	length -= hdr_len;
	p += hdr_len;
	caplen -= hdr_len;

	/* Frame Control field determines interpretation of packet */
	extracted_ethertype = 0;
	if (FRAME_TYPE(trp) == TOKEN_FC_LLC) {
		/* Try to print the LLC-layer header & higher layers */
		if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
		    &extracted_ethertype) == 0) {
			/* ether_type not known, print raw packet */
			if (!eflag)
				token_hdr_print(trp,
				    length + TOKEN_HDRLEN + route_len,
				    ESRC(&ehdr), EDST(&ehdr));
			if (extracted_ethertype) {
				printf("(LLC %s) ",
			etherproto_string(htons(extracted_ethertype)));
			}
			if (!xflag && !qflag)
				default_print(p, caplen);
		}
	} else {
		/* Some kinds of TR packet we cannot handle intelligently */
		/* XXX - dissect MAC packets if frame type is 0 */
		if (!eflag)
			token_hdr_print(trp, length + TOKEN_HDRLEN + route_len,
			    ESRC(&ehdr), EDST(&ehdr));
		if (!xflag && !qflag)
			default_print(p, caplen);
	}
	return (hdr_len);
}

/*
 * This is the top level routine of the printer.  'p' points
 * to the TR header of the packet, 'h->ts' is the timestamp,
 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
 * is the number of bytes actually captured.
 */
u_int
token_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
	return (token_print(p, h->len, h->caplen));
}
OpenPOWER on IntegriCloud