2 * Copyright (c) 1998-2007 The TCPDUMP project
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.
15 * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
18 /* \summary: Dynamic Trunking Protocol (DTP) printer */
24 #include <netdissect-stdinc.h>
26 #include "netdissect.h"
27 #include "addrtoname.h"
30 static const char tstr[] = " [|dtp]";
32 #define DTP_HEADER_LEN 1
33 #define DTP_DOMAIN_TLV 0x0001
34 #define DTP_STATUS_TLV 0x0002
35 #define DTP_DTP_TYPE_TLV 0x0003
36 #define DTP_NEIGHBOR_TLV 0x0004
38 static const struct tok dtp_tlv_values[] = {
39 { DTP_DOMAIN_TLV, "Domain TLV"},
40 { DTP_STATUS_TLV, "Status TLV"},
41 { DTP_DTP_TYPE_TLV, "DTP type TLV"},
42 { DTP_NEIGHBOR_TLV, "Neighbor TLV"},
47 dtp_print (netdissect_options *ndo, const u_char *pptr, u_int length)
52 if (length < DTP_HEADER_LEN)
57 ND_TCHECK2(*tptr, DTP_HEADER_LEN);
59 ND_PRINT((ndo, "DTPv%u, length %u",
64 * In non-verbose mode, just print version.
66 if (ndo->ndo_vflag < 1) {
70 tptr += DTP_HEADER_LEN;
72 while (tptr < (pptr+length)) {
75 type = EXTRACT_16BITS(tptr);
76 len = EXTRACT_16BITS(tptr+2);
77 /* XXX: should not be but sometimes it is, see the test captures */
80 ND_PRINT((ndo, "\n\t%s (0x%04x) TLV, length %u",
81 tok2str(dtp_tlv_values, "Unknown", type),
84 /* infinite loop check */
87 ND_TCHECK2(*tptr, len);
91 ND_PRINT((ndo, ", "));
92 fn_printzp(ndo, tptr+4, len-4, pptr+length);
96 case DTP_DTP_TYPE_TLV:
99 ND_PRINT((ndo, ", 0x%x", *(tptr+4)));
102 case DTP_NEIGHBOR_TLV:
105 ND_PRINT((ndo, ", %s", etheraddr_string(ndo, tptr+4)));
117 ND_PRINT((ndo, "%s", istr));
120 ND_PRINT((ndo, "%s", tstr));
125 * c-style: whitesmith