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 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include <tcpdump-stdinc.h>
25
26 #include <stdio.h>
27 #include <string.h>
28
29 #include "interface.h"
30 #include "addrtoname.h"
31 #include "extract.h"
32 #include "nlpid.h"
33
34 #define DTP_HEADER_LEN 1
35 #define DTP_DOMAIN_TLV 0x0001
36 #define DTP_STATUS_TLV 0x0002
37 #define DTP_DTP_TYPE_TLV 0x0003
38 #define DTP_NEIGHBOR_TLV 0x0004
39
40 static const struct tok dtp_tlv_values[] = {
41 { DTP_DOMAIN_TLV, "Domain TLV"},
42 { DTP_STATUS_TLV, "Status TLV"},
43 { DTP_DTP_TYPE_TLV, "DTP type TLV"},
44 { DTP_NEIGHBOR_TLV, "Neighbor TLV"},
45 { 0, NULL}
46 };
47
48 void
dtp_print(const u_char * pptr,u_int length)49 dtp_print (const u_char *pptr, u_int length)
50 {
51 int type, len;
52 const u_char *tptr;
53
54 if (length < DTP_HEADER_LEN)
55 goto trunc;
56
57 tptr = pptr;
58
59 if (!TTEST2(*tptr, DTP_HEADER_LEN))
60 goto trunc;
61
62 printf("DTPv%u, length %u",
63 (*tptr),
64 length);
65
66 /*
67 * In non-verbose mode, just print version.
68 */
69 if (vflag < 1) {
70 return;
71 }
72
73 tptr += DTP_HEADER_LEN;
74
75 while (tptr < (pptr+length)) {
76
77 if (!TTEST2(*tptr, 4))
78 goto trunc;
79
80 type = EXTRACT_16BITS(tptr);
81 len = EXTRACT_16BITS(tptr+2);
82
83 /* infinite loop check */
84 if (type == 0 || len == 0) {
85 return;
86 }
87
88 printf("\n\t%s (0x%04x) TLV, length %u",
89 tok2str(dtp_tlv_values, "Unknown", type),
90 type, len);
91
92 switch (type) {
93 case DTP_DOMAIN_TLV:
94 printf(", %s", tptr+4);
95 break;
96
97 case DTP_STATUS_TLV:
98 case DTP_DTP_TYPE_TLV:
99 printf(", 0x%x", *(tptr+4));
100 break;
101
102 case DTP_NEIGHBOR_TLV:
103 printf(", %s", etheraddr_string(tptr+4));
104 break;
105
106 default:
107 break;
108 }
109 tptr += len;
110 }
111
112 return;
113
114 trunc:
115 printf("[|dtp]");
116 }
117
118 /*
119 * Local Variables:
120 * c-style: whitesmith
121 * c-basic-offset: 4
122 * End:
123 */
124