3f79b68b1ac065a7b692712a60fc2830f851ae79
[dragonfly.git] / contrib / tcpdump-3.9 / print-msdp.c
1 /*
2  * Copyright (c) 2001 William C. Fenner.
3  *                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
7  * distributions retain the above copyright notice and this paragraph
8  * in its entirety, and (2) distributions including binary code include
9  * the above copyright notice and this paragraph in its entirety in
10  * the documentation or other materials provided with the distribution.
11  * The name of William C. Fenner may not be used to endorse or
12  * promote products derived from this software without specific prior
13  * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
14  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
15  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
16  * FOR A PARTICULAR PURPOSE.
17  */
18 #ifndef lint
19 static const char rcsid[] _U_ =
20     "@(#) $Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.7 2005/04/06 21:32:41 mcr Exp $";
21 #endif
22
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include <tcpdump-stdinc.h>
28
29 #include <stdio.h>
30 #include <stdlib.h>
31
32 #include "interface.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35
36 #define MSDP_TYPE_MAX   7
37
38 void
39 msdp_print(const unsigned char *sp, u_int length)
40 {
41         unsigned int type, len;
42
43         TCHECK2(*sp, 3);
44         /* See if we think we're at the beginning of a compound packet */
45         type = *sp;
46         len = EXTRACT_16BITS(sp + 1);
47         if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
48                 goto trunc;     /* not really truncated, but still not decodable */
49         (void)printf(" msdp:");
50         while (length > 0) {
51                 TCHECK2(*sp, 3);
52                 type = *sp;
53                 len = EXTRACT_16BITS(sp + 1);
54                 if (len > 1400 || vflag)
55                         printf(" [len %u]", len);
56                 if (len < 3)
57                         goto trunc;
58                 sp += 3;
59                 length -= 3;
60                 switch (type) {
61                 case 1: /* IPv4 Source-Active */
62                 case 3: /* IPv4 Source-Active Response */
63                         if (type == 1)
64                                 (void)printf(" SA");
65                         else
66                                 (void)printf(" SA-Response");
67                         TCHECK(*sp);
68                         (void)printf(" %u entries", *sp);
69                         if ((u_int)((*sp * 12) + 8) < len) {
70                                 (void)printf(" [w/data]");
71                                 if (vflag > 1) {
72                                         (void)printf(" ");
73                                         ip_print(gndo, sp + *sp * 12 + 8 - 3,
74                                                  len - (*sp * 12 + 8));
75                                 }
76                         }
77                         break;
78                 case 2:
79                         (void)printf(" SA-Request");
80                         TCHECK2(*sp, 5);
81                         (void)printf(" for %s", ipaddr_string(sp + 1));
82                         break;
83                 case 4:
84                         (void)printf(" Keepalive");
85                         if (len != 3)
86                                 (void)printf("[len=%d] ", len);
87                         break;
88                 case 5:
89                         (void)printf(" Notification");
90                         break;
91                 default:
92                         (void)printf(" [type=%d len=%d]", type, len);
93                         break;
94                 }
95                 sp += (len - 3);
96                 length -= (len - 3);
97         }
98         return;
99 trunc:
100         (void)printf(" [|msdp]");
101 }
102
103 /*
104  * Local Variables:
105  * c-style: whitesmith
106  * c-basic-offset: 8
107  * End:
108  */