772a2e056c7e5397b6e1cd7a9af70b0c66ec83d2
[dragonfly.git] / contrib / tcpdump-3.9 / print-rip.c
1 /*
2  * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that: (1) source code distributions
7  * retain the above copyright notice and this paragraph in its entirety, (2)
8  * distributions including binary code include the above copyright notice and
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14  * the University nor the names of its contributors may be used to endorse
15  * or promote products derived from this software without specific prior
16  * written permission.
17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20  */
21
22 #ifndef lint
23 static const char rcsid[] _U_ =
24     "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.57 2003/11/16 09:36:34 guy Exp $ (LBL)";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include <tcpdump-stdinc.h>
32
33 #include <stdio.h>
34 #include <string.h>
35
36 #include "interface.h"
37 #include "addrtoname.h"
38 #include "extract.h"                    /* must come after interface.h */
39
40 struct rip {
41         u_int8_t rip_cmd;               /* request/response */
42         u_int8_t rip_vers;              /* protocol version # */
43         u_int8_t unused[2];             /* unused */
44 };
45
46 #define RIPCMD_REQUEST          1       /* want info */
47 #define RIPCMD_RESPONSE         2       /* responding to request */
48 #define RIPCMD_TRACEON          3       /* turn tracing on */
49 #define RIPCMD_TRACEOFF         4       /* turn it off */
50 #define RIPCMD_POLL             5       /* want info from everybody */
51 #define RIPCMD_POLLENTRY        6       /* poll for entry */
52
53 static const struct tok rip_cmd_values[] = {
54     { RIPCMD_REQUEST,           "Request" },
55     { RIPCMD_RESPONSE,          "Response" },
56     { RIPCMD_TRACEON,           "Trace on" },
57     { RIPCMD_TRACEOFF,          "Trace off" },
58     { RIPCMD_POLL,              "Poll" },
59     { RIPCMD_POLLENTRY,         "Poll Entry" },
60     { 0, NULL}
61 };
62
63 #define RIP_AUTHLEN  16
64 #define RIP_ROUTELEN 20
65
66 /*
67  * rfc 1723
68  * 
69  *  0                   1                   2                   3 3
70  *  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
71  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
72  * | Command (1)   | Version (1)   |           unused              |
73  * +---------------+---------------+-------------------------------+
74  * | Address Family Identifier (2) |        Route Tag (2)          |
75  * +-------------------------------+-------------------------------+
76  * |                         IP Address (4)                        |
77  * +---------------------------------------------------------------+
78  * |                         Subnet Mask (4)                       |
79  * +---------------------------------------------------------------+
80  * |                         Next Hop (4)                          |
81  * +---------------------------------------------------------------+
82  * |                         Metric (4)                            |
83  * +---------------------------------------------------------------+
84  *
85  */
86
87 struct rip_netinfo {
88         u_int16_t rip_family;
89         u_int16_t rip_tag;
90         u_int32_t rip_dest;
91         u_int32_t rip_dest_mask;
92         u_int32_t rip_router;
93         u_int32_t rip_metric;           /* cost of route */
94 };
95
96 static void
97 rip_entry_print_v1(register const struct rip_netinfo *ni)
98 {
99         register u_short family;
100
101         /* RFC 1058 */
102         family = EXTRACT_16BITS(&ni->rip_family);
103         if (family != AF_INET) {
104                 printf("\n\t AFI: %u:", family);
105                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
106                 return;
107         }
108         if (EXTRACT_16BITS(&ni->rip_tag) ||
109             EXTRACT_32BITS(&ni->rip_dest_mask) ||
110             EXTRACT_32BITS(&ni->rip_router)) {
111                 /* MBZ fields not zero */
112                 print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
113                 return;
114         } /* AF_INET */
115         printf("\n\t  %s, metric: %u",
116                ipaddr_string(&ni->rip_dest),
117                EXTRACT_32BITS(&ni->rip_metric));
118 }
119
120 static void
121 rip_entry_print_v2(register const struct rip_netinfo *ni)
122 {
123         register u_char *p;
124         register u_short family;
125         u_char buf[RIP_AUTHLEN];
126
127         family = EXTRACT_16BITS(&ni->rip_family);
128         if (family == 0xFFFF) { /* 16 bytes authentication ? */
129                 if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */
130                         memcpy(buf, &ni->rip_dest, sizeof(buf));
131                         buf[sizeof(buf)-1] = '\0';
132                         for (p = buf; *p; p++) {
133                                 if (!isprint(*p))
134                                         break;
135                         }
136                         printf("\n\t  Simple Text Authentication data: %s", buf);
137                 } else {
138                         printf("\n\t  Unknown (%u) Authentication data:",
139                                EXTRACT_16BITS(&ni->rip_tag));
140                         print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t  ",RIP_AUTHLEN);
141                 }
142         } else if (family != AF_INET) {
143                 printf("\n\t  AFI: %u", family);
144                 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
145                 return;
146         } else { /* AF_INET */
147                 printf("\n\t  AFI: IPv4: %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
148                        ipaddr_string(&ni->rip_dest),
149                        mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
150                        EXTRACT_16BITS(&ni->rip_tag),
151                        EXTRACT_32BITS(&ni->rip_metric));
152                 if (EXTRACT_32BITS(&ni->rip_router))
153                         printf("%s", ipaddr_string(&ni->rip_router));
154                 else
155                     printf("self");
156         }
157 }
158
159 void
160 rip_print(const u_char *dat, u_int length)
161 {
162         register const struct rip *rp;
163         register const struct rip_netinfo *ni;
164         register u_int i, j;
165         register int trunc;
166
167         if (snapend < dat) {
168                 printf(" [|rip]");
169                 return;
170         }
171         i = snapend - dat;
172         if (i > length)
173                 i = length;
174         if (i < sizeof(*rp)) {
175                 printf(" [|rip]");
176                 return;
177         }
178         i -= sizeof(*rp);
179
180         rp = (struct rip *)dat;
181
182         printf("%sRIPv%u",
183                (vflag >= 1) ? "\n\t" : "",
184                rp->rip_vers);
185
186         switch (rp->rip_vers) {
187         case 0:
188                 /*
189                  * RFC 1058.
190                  *
191                  * XXX - RFC 1058 says
192                  *
193                  * 0  Datagrams whose version number is zero are to be ignored.
194                  *    These are from a previous version of the protocol, whose
195                  *    packet format was machine-specific.
196                  *
197                  * so perhaps we should just dump the packet, in hex.
198                  */
199                 print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length);
200                 break;
201         default:
202                 /* dump version and lets see if we know the commands name*/
203                 printf(", %s, length: %u",
204                        tok2str(rip_cmd_values,
205                                "unknown command (%u)",
206                                rp->rip_cmd),
207                        length);
208
209                 if (vflag < 1)
210                     return;
211
212                 switch (rp->rip_cmd) {
213                 case RIPCMD_RESPONSE:
214                         j = length / sizeof(*ni);
215                         printf(", routes: %u",j);
216                         trunc = (i / sizeof(*ni)) != j;
217                         ni = (struct rip_netinfo *)(rp + 1);
218                         for (; i >= sizeof(*ni); ++ni) {
219                                 if (rp->rip_vers == 1)
220                                         rip_entry_print_v1(ni);
221                                 else if (rp->rip_vers == 2)
222                                         rip_entry_print_v2(ni);
223                                 else
224                                     break;
225                                 i -= sizeof(*ni);
226                         }
227                         if (trunc)
228                                 printf("[|rip]");
229                         break;
230
231                 case RIPCMD_REQUEST:
232                 case RIPCMD_TRACEOFF:
233                 case RIPCMD_POLL:
234                 case RIPCMD_POLLENTRY:
235                         break;
236
237                 case RIPCMD_TRACEON:
238                     /* fall through */
239                 default:
240                     if (vflag <= 1) {
241                         if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
242                             return;
243                     }
244                     break;
245                 }
246                 /* do we want to see an additionally hexdump ? */
247                 if (vflag> 1) {
248                     if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
249                         return;
250                 }
251         }
252 }
253
254