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
|
/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
* 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.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.31 2004-03-24 00:45:39 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <pcap.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#include "ppp.h"
#include "chdlc.h"
static void chdlc_slarp_print(const u_char *, u_int);
/* Standard CHDLC printer */
u_int
chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
const struct ip *ip;
u_int proto;
if (caplen < CHDLC_HDRLEN) {
printf("[|chdlc]");
return (caplen);
}
proto = EXTRACT_16BITS(&p[2]);
if (eflag) {
switch (p[0]) {
case CHDLC_UNICAST:
printf("unicast ");
break;
case CHDLC_BCAST:
printf("bcast ");
break;
default:
printf("0x%02x ", p[0]);
break;
}
printf("%d %04x: ", length, proto);
}
length -= CHDLC_HDRLEN;
ip = (const struct ip *)(p + CHDLC_HDRLEN);
switch (proto) {
case ETHERTYPE_IP:
ip_print((const u_char *)ip, length);
break;
#ifdef INET6
case ETHERTYPE_IPV6:
ip6_print((const u_char *)ip, length);
break;
#endif
case CHDLC_TYPE_SLARP:
chdlc_slarp_print((const u_char *)ip, length);
break;
#if 0
case CHDLC_TYPE_CDP:
chdlc_cdp_print((const u_char *)ip, length);
break;
#endif
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MULTI:
mpls_print((const u_char *)(ip), length);
break;
case ETHERTYPE_ISO:
/* is the fudge byte set ? lets verify by spotting ISO headers */
if (*(p+CHDLC_HDRLEN+1) == 0x81 ||
*(p+CHDLC_HDRLEN+1) == 0x82 ||
*(p+CHDLC_HDRLEN+1) == 0x83)
isoclns_print(p+CHDLC_HDRLEN+1, length-1, length-1);
else
isoclns_print(p+CHDLC_HDRLEN, length, length);
break;
default:
printf("unknown CHDLC protocol (0x%04x)", proto);
break;
}
return (CHDLC_HDRLEN);
}
struct cisco_slarp {
u_int32_t code;
#define SLARP_REQUEST 0
#define SLARP_REPLY 1
#define SLARP_KEEPALIVE 2
union {
struct {
struct in_addr addr;
struct in_addr mask;
u_int16_t unused[3];
} addr;
struct {
u_int32_t myseq;
u_int32_t yourseq;
u_int16_t rel;
u_int16_t t1;
u_int16_t t2;
} keep;
} un;
};
#define SLARP_LEN 18
static void
chdlc_slarp_print(const u_char *cp, u_int length)
{
const struct cisco_slarp *slarp;
if (length < SLARP_LEN)
goto trunc;
slarp = (const struct cisco_slarp *)cp;
TCHECK(*slarp);
printf("SLARP (length: %u), ",length);
switch (EXTRACT_32BITS(&slarp->code)) {
case SLARP_REQUEST:
printf("request");
/* ok we do not know it - but lets at least dump it */
print_unknown_data(cp+4,"\n\t",length-4);
break;
case SLARP_REPLY:
printf("reply %s/%s",
ipaddr_string(&slarp->un.addr.addr),
ipaddr_string(&slarp->un.addr.mask));
break;
case SLARP_KEEPALIVE:
printf("keepalive: mineseen=0x%08x, yourseen=0x%08x",
EXTRACT_32BITS(&slarp->un.keep.myseq),
EXTRACT_32BITS(&slarp->un.keep.yourseq));
printf(", reliability=0x%04x, t1=%d.%d",
EXTRACT_16BITS(&slarp->un.keep.rel),
EXTRACT_16BITS(&slarp->un.keep.t1),
EXTRACT_16BITS(&slarp->un.keep.t2));
break;
default:
printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code));
if (vflag <= 1)
print_unknown_data(cp+4,"\n\t",length-4);
break;
}
if (SLARP_LEN < length && vflag)
printf(", (trailing junk: %d bytes)", length - SLARP_LEN);
if (vflag > 1)
print_unknown_data(cp+4,"\n\t",length-4);
return;
trunc:
printf("[|slarp]");
}
|
