nexmon – Blame information for rev 1

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1 office 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  
19 #define NETDISSECT_REWORKED
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23  
24 #include <tcpdump-stdinc.h>
25  
26 #include "interface.h"
27 #include "addrtoname.h"
28 #include "extract.h"
29  
30 #define MSDP_TYPE_MAX 7
31  
32 void
33 msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)
34 {
35 unsigned int type, len;
36  
37 ND_TCHECK2(*sp, 3);
38 /* See if we think we're at the beginning of a compound packet */
39 type = *sp;
40 len = EXTRACT_16BITS(sp + 1);
41 if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
42 goto trunc; /* not really truncated, but still not decodable */
43 ND_PRINT((ndo, " msdp:"));
44 while (length > 0) {
45 ND_TCHECK2(*sp, 3);
46 type = *sp;
47 len = EXTRACT_16BITS(sp + 1);
48 if (len > 1400 || ndo->ndo_vflag)
49 ND_PRINT((ndo, " [len %u]", len));
50 if (len < 3)
51 goto trunc;
52 sp += 3;
53 length -= 3;
54 switch (type) {
55 case 1: /* IPv4 Source-Active */
56 case 3: /* IPv4 Source-Active Response */
57 if (type == 1)
58 ND_PRINT((ndo, " SA"));
59 else
60 ND_PRINT((ndo, " SA-Response"));
61 ND_TCHECK(*sp);
62 ND_PRINT((ndo, " %u entries", *sp));
63 if ((u_int)((*sp * 12) + 8) < len) {
64 ND_PRINT((ndo, " [w/data]"));
65 if (ndo->ndo_vflag > 1) {
66 ND_PRINT((ndo, " "));
67 ip_print(ndo, sp + *sp * 12 + 8 - 3,
68 len - (*sp * 12 + 8));
69 }
70 }
71 break;
72 case 2:
73 ND_PRINT((ndo, " SA-Request"));
74 ND_TCHECK2(*sp, 5);
75 ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1)));
76 break;
77 case 4:
78 ND_PRINT((ndo, " Keepalive"));
79 if (len != 3)
80 ND_PRINT((ndo, "[len=%d] ", len));
81 break;
82 case 5:
83 ND_PRINT((ndo, " Notification"));
84 break;
85 default:
86 ND_PRINT((ndo, " [type=%d len=%d]", type, len));
87 break;
88 }
89 sp += (len - 3);
90 length -= (len - 3);
91 }
92 return;
93 trunc:
94 ND_PRINT((ndo, " [|msdp]"));
95 }
96  
97 /*
98 * Local Variables:
99 * c-style: whitesmith
100 * c-basic-offset: 8
101 * End:
102 */