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
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define RIPVERSION RIPv2
#include <protocols/routed.h>
#include "snoop.h"
static const char *show_cmd(int);
static int get_numtokens(unsigned int);
static const struct rip_sec_entry *rip_next_sec_entry(
const struct rip_sec_entry *, int);
int
interpret_rip(int flags, struct rip *rip, int fraglen)
{
const struct netinfo *nip;
const struct entryinfo *ep;
const struct netauth *nap;
const struct rip_sec_entry *rsep, *rsn;
const struct rip_emetric *rep;
const uint32_t *tokp;
int len, count;
const char *cmdstr, *auth;
struct in_addr dst;
uint32_t mval;
const struct sockaddr_in *sin;
/* Room for IP destination + "/" + IP mask */
char addrstr[15+1+15+1];
/* Room for "RIPv" + uint8_t as %d */
char ripvers[4+3+1];
/* RIP header is 4 octets long */
if ((len = fraglen - 4) < 0)
return (0);
if (flags & F_SUM) {
switch (rip->rip_cmd) {
case RIPCMD_REQUEST: cmdstr = "C"; break;
case RIPCMD_RESPONSE: cmdstr = "R"; break;
case RIPCMD_TRACEON: cmdstr = "Traceon"; break;
case RIPCMD_TRACEOFF: cmdstr = "Traceoff"; break;
case RIPCMD_POLL: cmdstr = "Poll"; break;
case RIPCMD_POLLENTRY: cmdstr = "Poll entry"; break;
case RIPCMD_SEC_RESPONSE: cmdstr = "R - SEC"; break;
case RIPCMD_SEC_T_RESPONSE: cmdstr = "R - SEC_T"; break;
default: cmdstr = "?"; break;
}
if (rip->rip_vers == RIPv1)
(void) strlcpy(ripvers, "RIP", sizeof (ripvers));
else
(void) snprintf(ripvers, sizeof (ripvers), "RIPv%d",
rip->rip_vers);
switch (rip->rip_cmd) {
case RIPCMD_REQUEST:
case RIPCMD_RESPONSE:
case RIPCMD_POLL:
nip = rip->rip_nets;
auth = "";
if (len >= sizeof (*nip) &&
nip->n_family == RIP_AF_AUTH) {
nap = (struct netauth *)nip;
len -= sizeof (*nip);
if (nap->a_type == RIP_AUTH_MD5 &&
len >= ntohs(nap->au.a_md5.md5_auth_len))
len -= ntohs(nap->au.a_md5.
md5_auth_len);
auth = " +Auth";
}
count = len / sizeof (*nip);
len %= sizeof (*nip);
(void) snprintf(get_sum_line(), MAXLINE,
"%s %s (%d destinations%s%s)", ripvers, cmdstr,
count, (len != 0 ? "?" : ""), auth);
break;
case RIPCMD_TRACEON:
case RIPCMD_TRACEOFF:
(void) snprintf(get_sum_line(), MAXLINE,
"%s %s File=\"%.*s\"", ripvers, cmdstr, len,
rip->rip_tracefile);
len = 0;
break;
case RIPCMD_SEC_RESPONSE:
case RIPCMD_SEC_T_RESPONSE:
if (len < sizeof (rip->rip_tsol.rip_generation))
break;
len -= sizeof (rip->rip_tsol.rip_generation);
count = 0;
rsep = rip->rip_tsol.rip_sec_entry;
while (len > 0) {
rsn = rip_next_sec_entry(rsep, len);
if (rsn == NULL)
break;
len -= (const char *)rsn - (const char *)rsep;
rsep = rsn;
count++;
}
(void) snprintf(get_sum_line(), MAXLINE,
"%s %s (%d destinations%s)", ripvers, cmdstr,
count, (len != 0 ? "?" : ""));
break;
default:
(void) snprintf(get_sum_line(), MAXLINE,
"%s %d (%s)", ripvers, rip->rip_cmd, cmdstr);
len = 0;
break;
}
}
if (flags & F_DTAIL) {
len = fraglen - 4;
show_header("RIP: ", "Routing Information Protocol", fraglen);
show_space();
(void) snprintf(get_line(0, 0), get_line_remain(),
"Opcode = %d (%s)", rip->rip_cmd,
show_cmd(rip->rip_cmd));
(void) snprintf(get_line(0, 0), get_line_remain(),
"Version = %d", rip->rip_vers);
switch (rip->rip_cmd) {
case RIPCMD_REQUEST:
case RIPCMD_RESPONSE:
case RIPCMD_POLL:
show_space();
(void) snprintf(get_line(0, 0), get_line_remain(),
"Destination Next Hop "
"Tag Metric");
for (nip = rip->rip_nets; len >= sizeof (*nip); nip++,
len -= sizeof (*nip)) {
if (nip->n_family == RIP_AF_AUTH) {
nap = (const struct netauth *)nip;
if (nap->a_type == RIP_AUTH_NONE) {
(void) snprintf(get_line
((char *)nip - dlc_header,
sizeof (*nip)),
get_line_remain(),
" *** Auth None");
} else if (nap->a_type == RIP_AUTH_PW) {
(void) snprintf(get_line
((char *)nip - dlc_header,
sizeof (*nip)),
get_line_remain(),
" *** Auth PW \"%.*s\"",
RIP_AUTH_PW_LEN,
nap->au.au_pw);
} else if (nap->a_type ==
RIP_AUTH_MD5) {
(void) snprintf(get_line(0, 0),
get_line_remain(),
" *** Auth MD5 pkt len %d, "
"keyid %d, sequence %08lX, "
"authlen %d",
ntohs(nap->au.a_md5.
md5_pkt_len),
nap->au.a_md5.md5_keyid,
(long)ntohl(nap->au.a_md5.
md5_seqno),
ntohs(nap->au.a_md5.
md5_auth_len));
if (len - sizeof (*nip) >=
ntohs(nap->au.a_md5.
md5_auth_len))
len -= ntohs(nap->au.
a_md5.md5_auth_len);
else
len = sizeof (*nip);
} else {
(void) snprintf(get_line
((char *)nip - dlc_header,
sizeof (*nip)),
get_line_remain(),
" *** Auth Type %d?",
ntohs(nap->a_type));
}
continue;
}
if (nip->n_family == RIP_AF_UNSPEC &&
rip->rip_cmd == RIPCMD_REQUEST) {
(void) snprintf(get_line(0, 0),
get_line_remain(),
" *** All routes");
continue;
}
if (nip->n_family != RIP_AF_INET) {
(void) snprintf(get_line(0, 0),
get_line_remain(),
" *** Address Family %d?",
ntohs(nip->n_family));
continue;
}
if (nip->n_dst == htonl(RIP_DEFAULT)) {
(void) strcpy(addrstr, "default");
} else {
dst.s_addr = nip->n_dst;
(void) strlcpy(addrstr, inet_ntoa(dst),
sizeof (addrstr));
}
if (nip->n_dst != htonl(RIP_DEFAULT) &&
rip->rip_vers >= RIPv2) {
count = strlen(addrstr);
mval = ntohl(nip->n_mask);
/* LINTED */
if (mval == INADDR_ANY) {
/* No mask */;
} else if ((mval + (mval & -mval)) ==
0) {
(void) snprintf(addrstr + count,
sizeof (addrstr) - count,
"/%d", 33 - ffs(mval));
} else {
dst.s_addr = nip->n_mask;
(void) snprintf(addrstr + count,
sizeof (addrstr) - count,
"/%s", inet_ntoa(dst));
}
}
dst.s_addr = nip->n_nhop;
mval = ntohl(nip->n_metric);
(void) snprintf(get_line(0, 0),
get_line_remain(),
"%-31s %-15s %-6d %d%s",
addrstr,
dst.s_addr == htonl(INADDR_ANY) ?
"--" : addrtoname(AF_INET, &dst),
ntohs(nip->n_tag),
mval,
(mval == HOPCNT_INFINITY ?
" (not reachable)" : ""));
}
break;
case RIPCMD_POLLENTRY:
if (len < sizeof (*ep))
break;
len -= sizeof (*ep);
ep = (const struct entryinfo *)rip->rip_nets;
/* LINTED */
sin = (const struct sockaddr_in *)&ep->rtu_dst;
(void) snprintf(get_line(0, 0), get_line_remain(),
"Destination = %s %s",
inet_ntoa(sin->sin_addr),
addrtoname(AF_INET, (void *)&sin->sin_addr));
/* LINTED */
sin = (const struct sockaddr_in *)&ep->rtu_router;
(void) snprintf(get_line(0, 0), get_line_remain(),
"Router = %s %s",
inet_ntoa(sin->sin_addr),
addrtoname(AF_INET, (void *)&sin->sin_addr));
(void) snprintf(get_line(0, 0), get_line_remain(),
"Flags = %4x", (unsigned)ep->rtu_flags);
(void) snprintf(get_line(0, 0), get_line_remain(),
"State = %d", ep->rtu_state);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Timer = %d", ep->rtu_timer);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Metric = %d", ep->rtu_metric);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Int flags = %8x", ep->int_flags);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Int name = \"%.*s\"", sizeof (ep->int_name),
ep->int_name);
break;
case RIPCMD_SEC_RESPONSE:
case RIPCMD_SEC_T_RESPONSE:
if (len < sizeof (rip->rip_tsol.rip_generation))
break;
len -= sizeof (rip->rip_tsol.rip_generation);
show_space();
(void) snprintf(get_line(0, 0), get_line_remain(),
"Generation = %u",
(unsigned)ntohl(rip->rip_tsol.rip_generation));
rsep = rip->rip_tsol.rip_sec_entry;
(void) snprintf(get_line(0, 0), get_line_remain(),
"Address E-METRIC");
rsep = rip->rip_tsol.rip_sec_entry;
while (len > 0) {
char *cp;
int blen, num;
rsn = rip_next_sec_entry(rsep, len);
if (rsn == NULL)
break;
dst.s_addr = rsep->rip_dst;
cp = get_line(0, 0);
blen = get_line_remain();
(void) snprintf(cp, blen, "%-16s ",
inet_ntoa(dst));
cp += 17;
blen -= 17;
rep = rsep->rip_emetric;
for (count = ntohl(rsep->rip_count); count > 0;
count--) {
(void) snprintf(cp, blen, "metric=%d",
ntohs(rep->rip_metric));
blen -= strlen(cp);
cp += strlen(cp);
tokp = rep->rip_token;
num = get_numtokens(
ntohs(rep->rip_mask));
/* advance to the next emetric */
rep = (const struct rip_emetric *)
&rep->rip_token[num];
if (num > 0) {
(void) snprintf(cp, blen,
",tokens=%lx",
(long)ntohl(*tokp));
tokp++;
num--;
} else {
(void) strlcpy(cp, ",no tokens",
blen);
}
while (num > 0) {
blen -= strlen(cp);
cp += strlen(cp);
(void) snprintf(cp, blen,
",%lx",
(long)ntohl(*tokp));
tokp++;
num--;
}
blen -= strlen(cp);
cp += strlen(cp);
}
if (rsep->rip_count == 0) {
(void) strlcpy(cp,
"NULL (not reachable)", blen);
}
len -= (const char *)rsn - (const char *)rsep;
rsep = rsn;
}
break;
case RIPCMD_TRACEON:
case RIPCMD_TRACEOFF:
(void) snprintf(get_line(0, 0), get_line_remain(),
"Trace file = %.*s", len, rip->rip_tracefile);
len = 0;
break;
}
}
return (fraglen - len);
}
static const char *
show_cmd(int c)
{
switch (c) {
case RIPCMD_REQUEST:
return ("route request");
case RIPCMD_RESPONSE:
return ("route response");
case RIPCMD_TRACEON:
return ("route trace on");
case RIPCMD_TRACEOFF:
return ("route trace off");
case RIPCMD_POLL:
return ("route poll");
case RIPCMD_POLLENTRY:
return ("route poll entry");
case RIPCMD_SEC_RESPONSE:
return ("route sec response");
case RIPCMD_SEC_T_RESPONSE:
return ("route sec_t response");
}
return ("?");
}
static int
get_numtokens(unsigned int mask)
{
int num = 0;
while (mask != 0) {
num++;
mask &= mask - 1;
}
return (num);
}
static const struct rip_sec_entry *
rip_next_sec_entry(const struct rip_sec_entry *rsep, int len)
{
const struct rip_emetric *rep;
const char *limit = (const char *)rsep + len;
long count;
if ((const char *)(rep = rsep->rip_emetric) > limit)
return (NULL);
count = ntohl(rsep->rip_count);
while (count > 0) {
if ((const char *)rep->rip_token > limit)
return (NULL);
rep = (struct rip_emetric *)
&rep->rip_token[get_numtokens(ntohs(rep->rip_mask))];
if ((const char *)rep > limit)
return (NULL);
count--;
}
return ((const struct rip_sec_entry *)rep);
}
|
