1/*
2 * Copyright (c) 1988-1997
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Copyright (c) 1998-2012  Michael Richardson <mcr@tcpdump.org>
6 *      The TCPDUMP project
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that: (1) source code distributions
10 * retain the above copyright notice and this paragraph in its entirety, (2)
11 * distributions including binary code include the above copyright notice and
12 * this paragraph in its entirety in the documentation or other materials
13 * provided with the distribution, and (3) all advertising materials mentioning
14 * features or use of this software display the following acknowledgement:
15 * ``This product includes software developed by the University of California,
16 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
17 * the University nor the names of its contributors may be used to endorse
18 * or promote products derived from this software without specific prior
19 * written permission.
20 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
21 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
23 */
24
25#ifdef HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <netdissect-stdinc.h>
30#include "netdissect.h"
31#include <string.h>
32#include <stdio.h>
33
34#ifdef USE_LIBSMI
35#include <smi.h>
36#endif
37
38/*
39 * Initialize anything that must be initialized before dissecting
40 * packets.
41 *
42 * This should be called at the beginning of the program; it does
43 * not need to be called, and should not be called, for every
44 * netdissect_options structure.
45 */
46int
47nd_init(char *errbuf, size_t errbuf_size)
48{
49#ifdef _WIN32
50	WORD wVersionRequested;
51	WSADATA wsaData;
52	int err;
53
54	/*
55	 * Request Winsock 2.2; we expect Winsock 2.
56	 */
57	wVersionRequested = MAKEWORD(2, 2);
58	err = WSAStartup(wVersionRequested, &wsaData);
59	if (err != 0) {
60		strlcpy(errbuf, "Attempting to initialize Winsock failed",
61		    errbuf_size);
62		return (-1);
63	}
64#endif /* _WIN32 */
65
66#ifdef USE_LIBSMI
67	/*
68	 * XXX - should we just fail if this fails?  Some of the
69	 * libsmi calls may fail.
70	 */
71	smiInit("tcpdump");
72#endif
73
74	/*
75	 * Clears the error buffer, and uses it so we don't get
76	 * "unused argument" warnings at compile time.
77	 */
78	strlcpy(errbuf, "", errbuf_size);
79	return (0);
80}
81
82/*
83 * Clean up anything that ndo_init() did.
84 */
85void
86nd_cleanup(void)
87{
88#ifdef USE_LIBSMI
89	/*
90	 * This appears, in libsmi 0.4.8, to do nothing if smiInit()
91	 * wasn't done or failed, so we call it unconditionally.
92	 */
93	smiExit();
94#endif
95
96#ifdef _WIN32
97	/*
98	 * Undo the WSAStartup() call above.
99	 */
100	WSACleanup();
101#endif
102}
103
104int
105nd_have_smi_support(void)
106{
107#ifdef USE_LIBSMI
108	return (1);
109#else
110	return (0);
111#endif
112}
113
114/*
115 * Indicates whether an SMI module has been loaded, so that we can use
116 * libsmi to translate OIDs.
117 */
118int nd_smi_module_loaded;
119
120int
121nd_load_smi_module(const char *module, char *errbuf, size_t errbuf_size)
122{
123#ifdef USE_LIBSMI
124	if (smiLoadModule(module) == 0) {
125		snprintf(errbuf, errbuf_size, "could not load MIB module %s",
126		    module);
127		return (-1);
128	}
129	nd_smi_module_loaded = 1;
130	return (0);
131#else
132	snprintf(errbuf, errbuf_size, "MIB module %s not loaded: no libsmi support",
133	    module);
134	return (-1);
135#endif
136}
137
138const char *
139nd_smi_version_string(void)
140{
141#ifdef USE_LIBSMI
142	return (smi_version_string);
143#else
144	return (NULL);
145#endif
146}
147