print-dtp.c revision 190203 
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
40static 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
48void
49dtp_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