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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
|
/*
* Copyright (c) 1989, 1990, 1991, 1993, 1994, 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.
*/
/* \summary: Routing Information Protocol (RIP) printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include <stdio.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "af.h"
static const char tstr[] = "[|rip]";
struct rip {
uint8_t rip_cmd; /* request/response */
uint8_t rip_vers; /* protocol version # */
uint8_t unused[2]; /* unused */
};
#define RIPCMD_REQUEST 1 /* want info */
#define RIPCMD_RESPONSE 2 /* responding to request */
#define RIPCMD_TRACEON 3 /* turn tracing on */
#define RIPCMD_TRACEOFF 4 /* turn it off */
#define RIPCMD_POLL 5 /* want info from everybody */
#define RIPCMD_POLLENTRY 6 /* poll for entry */
static const struct tok rip_cmd_values[] = {
{ RIPCMD_REQUEST, "Request" },
{ RIPCMD_RESPONSE, "Response" },
{ RIPCMD_TRACEON, "Trace on" },
{ RIPCMD_TRACEOFF, "Trace off" },
{ RIPCMD_POLL, "Poll" },
{ RIPCMD_POLLENTRY, "Poll Entry" },
{ 0, NULL}
};
#define RIP_AUTHLEN 16
#define RIP_ROUTELEN 20
/*
* rfc 1723
*
* 0 1 2 3 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Command (1) | Version (1) | unused |
* +---------------+---------------+-------------------------------+
* | Address Family Identifier (2) | Route Tag (2) |
* +-------------------------------+-------------------------------+
* | IP Address (4) |
* +---------------------------------------------------------------+
* | Subnet Mask (4) |
* +---------------------------------------------------------------+
* | Next Hop (4) |
* +---------------------------------------------------------------+
* | Metric (4) |
* +---------------------------------------------------------------+
*
*/
struct rip_netinfo {
uint16_t rip_family;
uint16_t rip_tag;
uint32_t rip_dest;
uint32_t rip_dest_mask;
uint32_t rip_router;
uint32_t rip_metric; /* cost of route */
};
static void
rip_entry_print_v1(netdissect_options *ndo,
register const struct rip_netinfo *ni)
{
register u_short family;
/* RFC 1058 */
family = EXTRACT_16BITS(&ni->rip_family);
if (family != BSD_AFNUM_INET && family != 0) {
ND_PRINT((ndo, "\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family)));
print_unknown_data(ndo, (const uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN);
return;
}
if (EXTRACT_16BITS(&ni->rip_tag) ||
EXTRACT_32BITS(&ni->rip_dest_mask) ||
EXTRACT_32BITS(&ni->rip_router)) {
/* MBZ fields not zero */
print_unknown_data(ndo, (const uint8_t *)&ni->rip_family, "\n\t ", RIP_ROUTELEN);
return;
}
if (family == 0) {
ND_PRINT((ndo, "\n\t AFI 0, %s, metric: %u",
ipaddr_string(ndo, &ni->rip_dest),
EXTRACT_32BITS(&ni->rip_metric)));
return;
} /* BSD_AFNUM_INET */
ND_PRINT((ndo, "\n\t %s, metric: %u",
ipaddr_string(ndo, &ni->rip_dest),
EXTRACT_32BITS(&ni->rip_metric)));
}
static unsigned
rip_entry_print_v2(netdissect_options *ndo,
register const struct rip_netinfo *ni, const unsigned remaining)
{
register u_short family;
family = EXTRACT_16BITS(&ni->rip_family);
if (family == 0xFFFF) { /* variable-sized authentication structures */
uint16_t auth_type = EXTRACT_16BITS(&ni->rip_tag);
if (auth_type == 2) {
register const u_char *p = (const u_char *)&ni->rip_dest;
u_int i = 0;
ND_PRINT((ndo, "\n\t Simple Text Authentication data: "));
for (; i < RIP_AUTHLEN; p++, i++)
ND_PRINT((ndo, "%c", ND_ISPRINT(*p) ? *p : '.'));
} else if (auth_type == 3) {
ND_PRINT((ndo, "\n\t Auth header:"));
ND_PRINT((ndo, " Packet Len %u,", EXTRACT_16BITS((const uint8_t *)ni + 4)));
ND_PRINT((ndo, " Key-ID %u,", *((const uint8_t *)ni + 6)));
ND_PRINT((ndo, " Auth Data Len %u,", *((const uint8_t *)ni + 7)));
ND_PRINT((ndo, " SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask)));
ND_PRINT((ndo, " MBZ %u,", EXTRACT_32BITS(&ni->rip_router)));
ND_PRINT((ndo, " MBZ %u", EXTRACT_32BITS(&ni->rip_metric)));
} else if (auth_type == 1) {
ND_PRINT((ndo, "\n\t Auth trailer:"));
print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining);
return remaining; /* AT spans till the packet end */
} else {
ND_PRINT((ndo, "\n\t Unknown (%u) Authentication data:",
EXTRACT_16BITS(&ni->rip_tag)));
print_unknown_data(ndo, (const uint8_t *)&ni->rip_dest, "\n\t ", remaining);
}
} else if (family != BSD_AFNUM_INET && family != 0) {
ND_PRINT((ndo, "\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family)));
print_unknown_data(ndo, (const uint8_t *)&ni->rip_tag, "\n\t ", RIP_ROUTELEN-2);
} else { /* BSD_AFNUM_INET or AFI 0 */
ND_PRINT((ndo, "\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
tok2str(bsd_af_values, "%u", family),
ipaddr_string(ndo, &ni->rip_dest),
mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
EXTRACT_16BITS(&ni->rip_tag),
EXTRACT_32BITS(&ni->rip_metric)));
if (EXTRACT_32BITS(&ni->rip_router))
ND_PRINT((ndo, "%s", ipaddr_string(ndo, &ni->rip_router)));
else
ND_PRINT((ndo, "self"));
}
return sizeof (*ni);
}
void
rip_print(netdissect_options *ndo,
const u_char *dat, u_int length)
{
register const struct rip *rp;
register const struct rip_netinfo *ni;
register u_int i, j;
if (ndo->ndo_snapend < dat) {
ND_PRINT((ndo, " %s", tstr));
return;
}
i = ndo->ndo_snapend - dat;
if (i > length)
i = length;
if (i < sizeof(*rp)) {
ND_PRINT((ndo, " %s", tstr));
return;
}
i -= sizeof(*rp);
rp = (const struct rip *)dat;
ND_PRINT((ndo, "%sRIPv%u",
(ndo->ndo_vflag >= 1) ? "\n\t" : "",
rp->rip_vers));
switch (rp->rip_vers) {
case 0:
/*
* RFC 1058.
*
* XXX - RFC 1058 says
*
* 0 Datagrams whose version number is zero are to be ignored.
* These are from a previous version of the protocol, whose
* packet format was machine-specific.
*
* so perhaps we should just dump the packet, in hex.
*/
print_unknown_data(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length);
break;
default:
/* dump version and lets see if we know the commands name*/
ND_PRINT((ndo, ", %s, length: %u",
tok2str(rip_cmd_values,
"unknown command (%u)",
rp->rip_cmd),
length));
if (ndo->ndo_vflag < 1)
return;
switch (rp->rip_cmd) {
case RIPCMD_REQUEST:
case RIPCMD_RESPONSE:
j = length / sizeof(*ni);
ND_PRINT((ndo, ", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : ""));
ni = (const struct rip_netinfo *)(rp + 1);
for (; i >= sizeof(*ni); ++ni) {
if (rp->rip_vers == 1)
{
rip_entry_print_v1(ndo, ni);
i -= sizeof(*ni);
}
else if (rp->rip_vers == 2)
i -= rip_entry_print_v2(ndo, ni, i);
else
break;
}
if (i)
ND_PRINT((ndo, "%s", tstr));
break;
case RIPCMD_TRACEOFF:
case RIPCMD_POLL:
case RIPCMD_POLLENTRY:
break;
case RIPCMD_TRACEON:
/* fall through */
default:
if (ndo->ndo_vflag <= 1) {
if(!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
return;
}
break;
}
/* do we want to see an additionally hexdump ? */
if (ndo->ndo_vflag> 1) {
if(!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
return;
}
}
}
|
