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
|
/*
* 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.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.49 2001-05-10 05:30:22 fenner Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "extract.h" /* must come after interface.h */
struct rip {
u_char rip_cmd; /* request/response */
u_char rip_vers; /* protocol version # */
u_short rip_zero2; /* 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 */
#define RIP_AUTHLEN 16
struct rip_netinfo {
u_short rip_family;
u_short rip_tag;
u_int32_t rip_dest;
u_int32_t rip_dest_mask;
u_int32_t rip_router;
u_int32_t rip_metric; /* cost of route */
};
static void
rip_printblk(const u_char *cp, const u_char *ep)
{
for (; cp < ep; cp += 2)
printf(" %04x", EXTRACT_16BITS(cp));
return;
}
static void
rip_entry_print_v1(register int vers, register const struct rip_netinfo *ni)
{
register u_short family;
/* RFC 1058 */
family = EXTRACT_16BITS(&ni->rip_family);
if (family != AF_INET) {
printf(" [family %d:", family);
rip_printblk((u_char *)&ni->rip_tag,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
return;
}
if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
/* MBZ fields not zero */
printf(" [");
rip_printblk((u_char *)&ni->rip_family,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
return;
}
printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
EXTRACT_32BITS(&ni->rip_metric));
}
static void
rip_entry_print_v2(register int vers, register const struct rip_netinfo *ni)
{
register u_char *p;
register u_short family;
u_char buf[RIP_AUTHLEN];
/* RFC 1723 */
family = EXTRACT_16BITS(&ni->rip_family);
if (family == 0xFFFF) {
if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
memcpy(buf, &ni->rip_dest, sizeof(buf));
buf[sizeof(buf)-1] = '\0';
for (p = buf; *p; p++) {
if (!isprint(*p))
break;
}
if (!*p) {
printf(" [password %s]", buf);
} else {
printf(" [password: ");
rip_printblk((u_char *)&ni->rip_dest,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
}
} else {
printf(" [auth %d:",
EXTRACT_16BITS(&ni->rip_tag));
rip_printblk((u_char *)&ni->rip_dest,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
}
} else if (family != AF_INET) {
printf(" [family %d:", family);
rip_printblk((u_char *)&ni->rip_tag,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
printf("]");
return;
} else { /* AF_INET */
printf(" {%s", ipaddr_string(&ni->rip_dest));
if (ni->rip_dest_mask)
printf("/%s", ipaddr_string(&ni->rip_dest_mask));
if (ni->rip_router)
printf("->%s", ipaddr_string(&ni->rip_router));
if (ni->rip_tag)
printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
}
}
void
rip_print(const u_char *dat, u_int length)
{
register const struct rip *rp;
register const struct rip_netinfo *ni;
register int i, j, trunc;
i = min(length, snapend - dat) - sizeof(*rp);
if (i < 0) {
printf(" [|rip]");
return;
}
rp = (struct rip *)dat;
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 first few words of
* the packet, in hex.
*/
printf(" RIPv0: ");
ni = (struct rip_netinfo *)(rp + 1);
rip_printblk((u_char *)&ni->rip_family,
(u_char *)&ni->rip_metric +
sizeof(ni->rip_metric));
break;
default:
switch (rp->rip_cmd) {
case RIPCMD_REQUEST:
printf(" RIPv%d-req %d", rp->rip_vers, length);
break;
case RIPCMD_RESPONSE:
j = length / sizeof(*ni);
if (j * sizeof(*ni) != length - 4)
printf(" RIPv%d-resp [items %d] [%d]:",
rp->rip_vers, j, length);
else
printf(" RIPv%d-resp [items %d]:",
rp->rip_vers, j);
trunc = (i / sizeof(*ni)) != j;
ni = (struct rip_netinfo *)(rp + 1);
for (; (i -= sizeof(*ni)) >= 0; ++ni) {
if (rp->rip_vers == 1)
rip_entry_print_v1(rp->rip_vers, ni);
else
rip_entry_print_v2(rp->rip_vers, ni);
}
if (trunc)
printf("[|rip]");
break;
case RIPCMD_TRACEON:
printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
(void)fn_print((const u_char *)(rp + 1), snapend);
fputs("\"", stdout);
break;
case RIPCMD_TRACEOFF:
printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
break;
case RIPCMD_POLL:
printf(" RIPv%d-poll %d", rp->rip_vers, length);
break;
case RIPCMD_POLLENTRY:
printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
break;
default:
printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
length);
break;
}
}
}
|
