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1 office 1 /*
2 * Copyright (c) 1998-2007 The TCPDUMP project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in
9 * the documentation or other materials provided with the distribution.
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
13 * FOR A PARTICULAR PURPOSE.
14 *
15 * Dynamic Trunk Protocol (DTP)
16 *
17 * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
18 */
19  
20 #define NETDISSECT_REWORKED
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24  
25 #include <tcpdump-stdinc.h>
26  
27 #include "interface.h"
28 #include "addrtoname.h"
29 #include "extract.h"
30  
31 #define DTP_HEADER_LEN 1
32 #define DTP_DOMAIN_TLV 0x0001
33 #define DTP_STATUS_TLV 0x0002
34 #define DTP_DTP_TYPE_TLV 0x0003
35 #define DTP_NEIGHBOR_TLV 0x0004
36  
37 static const struct tok dtp_tlv_values[] = {
38 { DTP_DOMAIN_TLV, "Domain TLV"},
39 { DTP_STATUS_TLV, "Status TLV"},
40 { DTP_DTP_TYPE_TLV, "DTP type TLV"},
41 { DTP_NEIGHBOR_TLV, "Neighbor TLV"},
42 { 0, NULL}
43 };
44  
45 void
46 dtp_print (netdissect_options *ndo, const u_char *pptr, u_int length)
47 {
48 int type, len;
49 const u_char *tptr;
50  
51 if (length < DTP_HEADER_LEN)
52 goto trunc;
53  
54 tptr = pptr;
55  
56 ND_TCHECK2(*tptr, DTP_HEADER_LEN);
57  
58 ND_PRINT((ndo, "DTPv%u, length %u",
59 (*tptr),
60 length));
61  
62 /*
63 * In non-verbose mode, just print version.
64 */
65 if (ndo->ndo_vflag < 1) {
66 return;
67 }
68  
69 tptr += DTP_HEADER_LEN;
70  
71 while (tptr < (pptr+length)) {
72  
73 ND_TCHECK2(*tptr, 4);
74  
75 type = EXTRACT_16BITS(tptr);
76 len = EXTRACT_16BITS(tptr+2);
77  
78 /* infinite loop check */
79 if (type == 0 || len == 0) {
80 return;
81 }
82  
83 ND_PRINT((ndo, "\n\t%s (0x%04x) TLV, length %u",
84 tok2str(dtp_tlv_values, "Unknown", type),
85 type, len));
86  
87 switch (type) {
88 case DTP_DOMAIN_TLV:
89 ND_PRINT((ndo, ", %s", tptr+4));
90 break;
91  
92 case DTP_STATUS_TLV:
93 case DTP_DTP_TYPE_TLV:
94 ND_PRINT((ndo, ", 0x%x", *(tptr+4)));
95 break;
96  
97 case DTP_NEIGHBOR_TLV:
98 ND_PRINT((ndo, ", %s", etheraddr_string(ndo, tptr+4)));
99 break;
100  
101 default:
102 break;
103 }
104 tptr += len;
105 }
106  
107 return;
108  
109 trunc:
110 ND_PRINT((ndo, "[|dtp]"));
111 }
112  
113 /*
114 * Local Variables:
115 * c-style: whitesmith
116 * c-basic-offset: 4
117 * End:
118 */