summaryrefslogtreecommitdiff
path: root/src/libtnccs/plugins/tnc_imc/tnc_imc.c
blob: 7c52ab384d89df05672078991b5754629e7d1854 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
/*
 * Copyright (C) 2010-2013 Andreas Steffen,
 * HSR Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

#include "tnc_imc.h"

#include <dlfcn.h>

#include <tncif_pa_subtypes.h>

#include <utils/debug.h>
#include <library.h>
#include <collections/linked_list.h>
#include <threading/mutex.h>

typedef struct private_tnc_imc_t private_tnc_imc_t;

/**
 * Private data of an imc_t object.
 */
struct private_tnc_imc_t {

	/**
	 * Public members of imc_t.
	 */
	imc_t public;

	/**
	 * Name of loaded IMC
	 */
	char *name;

	/**
	 * Handle of loaded IMC
	 */
	void *handle;

	/**
	 * ID of loaded IMC
	 */
	TNC_IMCID id;

	/**
	 * list of additional IMC IDs
	 */
	linked_list_t *additional_ids;

	/**
	 * List of message types supported by IMC - Vendor ID part
	 */
	TNC_VendorIDList supported_vids;

	/**
	 * List of message types supported by IMC - Subtype part
	 */
	TNC_MessageSubtypeList supported_subtypes;

	/**
	 * Number of supported message types
	 */
	TNC_UInt32 type_count;

	/**
	 * mutex to lock the imc_t object
	 */
	mutex_t *mutex;
};

METHOD(imc_t, set_id, void,
	private_tnc_imc_t *this, TNC_IMCID id)
{
	this->id = id;
}

METHOD(imc_t, get_id, TNC_IMCID,
	private_tnc_imc_t *this)
{
	return this->id;
}

METHOD(imc_t, add_id, void,
	private_tnc_imc_t *this, TNC_IMCID id)
{
	void *pointer;

	/* store the scalar value in the pointer */
	pointer = (void*)id;
	this->additional_ids->insert_last(this->additional_ids, pointer);
}

METHOD(imc_t, has_id, bool,
	private_tnc_imc_t *this, TNC_IMCID id)
{
	enumerator_t *enumerator;
	TNC_IMCID additional_id;
	void *pointer;
	bool found = FALSE;

	/* check primary IMC ID */
	if (id == this->id)
	{
		return TRUE;
	}

	/* return if there are no additional IMC IDs */
	if (this->additional_ids->get_count(this->additional_ids) == 0)
	{
		return FALSE;
	}

	/* check additional IMC IDs */
	enumerator = this->additional_ids->create_enumerator(this->additional_ids);
	while (enumerator->enumerate(enumerator, &pointer))
	{
		/* interpret pointer as scalar value */
		additional_id = (TNC_UInt32)pointer;

		if (id == additional_id)
		{
			found = TRUE;
			break;
		}
	}
	enumerator->destroy(enumerator);

	return found;
}

METHOD(imc_t, get_name, char*,
	private_tnc_imc_t *this)
{
	return this->name;
}

METHOD(imc_t, set_message_types, void,
	private_tnc_imc_t *this, TNC_MessageTypeList supported_types,
							 TNC_UInt32 type_count)
{
	char buf[BUF_LEN];
	char *pos = buf;
	int len = sizeof(buf);
	int i, written;
	size_t size;
	TNC_VendorID vid;
	TNC_MessageSubtype subtype;
	enum_name_t *pa_subtype_names;

	/* lock the imc_t instance */
	this->mutex->lock(this->mutex);

	/* Free existing VendorID and MessageSubtype lists */
	free(this->supported_vids);
	this->supported_vids = NULL;
	free(this->supported_subtypes);
	this->supported_subtypes = NULL;

	/* Store the new MessageType list */
	this->type_count = type_count;
	if (type_count && supported_types)
	{
		size = type_count * sizeof(TNC_VendorID);
		this->supported_vids = malloc(size);
		size = type_count * sizeof(TNC_MessageSubtype);
		this->supported_subtypes = malloc(size);

		for (i = 0; i < type_count; i++)
		{
			vid = (supported_types[i] >> 8) & TNC_VENDORID_ANY;
			subtype = supported_types[i] & TNC_SUBTYPE_ANY;

			pa_subtype_names = get_pa_subtype_names(vid);
			if (pa_subtype_names)
			{
				written = snprintf(pos, len," '%N/%N' 0x%06x/0x%02x",
								   pen_names, vid, pa_subtype_names, subtype,
								   vid, subtype);
			}
			else
			{
				written = snprintf(pos, len," '%N' 0x%06x/0x%02x",
								   pen_names, vid, vid, subtype);
			}
			if (written >= len)
			{
				break;
			}
			pos += written;
			len -= written;

			this->supported_vids[i] = vid;
			this->supported_subtypes[i] = subtype;
		}
	}
	*pos = '\0';
	DBG2(DBG_TNC, "IMC %u supports %u message type%s:%s",
				  this->id, type_count, (type_count == 1) ? "":"s", buf);

	/* unlock the imc_t instance */
	this->mutex->unlock(this->mutex);
}

METHOD(imc_t, set_message_types_long, void,
	private_tnc_imc_t *this, TNC_VendorIDList supported_vids,
	TNC_MessageSubtypeList supported_subtypes, TNC_UInt32 type_count)
{
	char buf[BUF_LEN];
	char *pos = buf;
	int len = sizeof(buf);
	int i, written;
	size_t size;
	TNC_VendorID vid;
	TNC_MessageSubtype subtype;
	enum_name_t *pa_subtype_names;

	/* lock the imc_t instance */
	this->mutex->lock(this->mutex);

	/* Free existing VendorID and MessageSubtype lists */
	free(this->supported_vids);
	this->supported_vids = NULL;
	free(this->supported_subtypes);
	this->supported_subtypes = NULL;

	/* Store the new MessageType list */
	this->type_count = type_count;
	if (type_count && supported_vids && supported_subtypes)
	{
		size = type_count * sizeof(TNC_VendorID);
		this->supported_vids = malloc(size);
		memcpy(this->supported_vids, supported_vids, size);
		size = type_count * sizeof(TNC_MessageSubtype);
		this->supported_subtypes = malloc(size);
		memcpy(this->supported_subtypes, supported_subtypes, size);

		for (i = 0; i < type_count; i++)
		{
			vid = supported_vids[i];
			subtype = supported_subtypes[i];

			pa_subtype_names = get_pa_subtype_names(vid);
			if (pa_subtype_names)
			{
				written = snprintf(pos, len," '%N/%N' 0x%06x/0x%08x",
								   pen_names, vid, pa_subtype_names, subtype,
								   vid, subtype);
			}
			else
			{
				written = snprintf(pos, len," '%N' 0x%06x/0x%08x",
								   pen_names, vid, vid, subtype);
			}
			if (written >= len)
			{
				break;
			}
			pos += written;
			len -= written;
		}
	}
	*pos = '\0';
	DBG2(DBG_TNC, "IMC %u supports %u message type%s:%s",
				  this->id, type_count, (type_count == 1) ? "":"s", buf);

	/* unlock the imc_t instance */
	this->mutex->unlock(this->mutex);
}

METHOD(imc_t, type_supported, bool,
	private_tnc_imc_t *this, TNC_VendorID msg_vid, TNC_MessageSubtype msg_subtype)
{
	TNC_VendorID vid;
	TNC_MessageSubtype subtype;
	int i;

	for (i = 0; i < this->type_count; i++)
	{
		vid = this->supported_vids[i];
		subtype = this->supported_subtypes[i];

		if ((vid == TNC_VENDORID_ANY && subtype == TNC_SUBTYPE_ANY) ||
			(vid == msg_vid && (subtype == TNC_SUBTYPE_ANY ||
			 subtype == msg_subtype)))
		{
			return TRUE;
		}
	}
	return FALSE;
}

METHOD(imc_t, destroy, void,
	private_tnc_imc_t *this)
{
	if (this->handle && lib->settings->get_bool(lib->settings,
		"libtnccs.plugins.tnc-imc.dlclose", TRUE))
	{
		dlclose(this->handle);
	}
	this->mutex->destroy(this->mutex);
	this->additional_ids->destroy(this->additional_ids);
	free(this->supported_vids);
	free(this->supported_subtypes);
	free(this->name);
	free(this);
}

/**
 * Generic constructor
 */
static private_tnc_imc_t* tnc_imc_create_empty(char *name)
{
	private_tnc_imc_t *this;

	INIT(this,
		.public = {
			.set_id = _set_id,
			.get_id = _get_id,
			.add_id = _add_id,
			.has_id = _has_id,
			.get_name = _get_name,
			.set_message_types = _set_message_types,
			.set_message_types_long = _set_message_types_long,
			.type_supported = _type_supported,
			.destroy = _destroy,
		},
		.name = strdup(name),
		.additional_ids = linked_list_create(),
		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
	);

	return this;
}

/**
 * See header
 */
imc_t* tnc_imc_create(char *name, char *path)
{
	private_tnc_imc_t *this;

	this = tnc_imc_create_empty(name);

	this->handle = dlopen(path, RTLD_LAZY);
	if (!this->handle)
	{
		DBG1(DBG_TNC, "IMC \"%s\" failed to load: %s", name, dlerror());
		destroy(this);
		return NULL;
	}

	this->public.initialize = dlsym(this->handle, "TNC_IMC_Initialize");
	if (!this->public.initialize)
	{
		DBG1(DBG_TNC, "could not resolve TNC_IMC_Initialize in %s: %s\n",
					   path, dlerror());
		destroy(this);
		return NULL;
	}
	this->public.notify_connection_change =
						 dlsym(this->handle, "TNC_IMC_NotifyConnectionChange");
	this->public.begin_handshake = dlsym(this->handle, "TNC_IMC_BeginHandshake");
	if (!this->public.begin_handshake)
	{
		DBG1(DBG_TNC, "could not resolve TNC_IMC_BeginHandshake in %s: %s\n",
					   path, dlerror());
		destroy(this);
		return NULL;
	}
	this->public.receive_message =
						dlsym(this->handle, "TNC_IMC_ReceiveMessage");
	this->public.receive_message_long =
						dlsym(this->handle, "TNC_IMC_ReceiveMessageLong");
	this->public.batch_ending =
						dlsym(this->handle, "TNC_IMC_BatchEnding");
	this->public.terminate =
						dlsym(this->handle, "TNC_IMC_Terminate");
	this->public.provide_bind_function =
						dlsym(this->handle, "TNC_IMC_ProvideBindFunction");
	if (!this->public.provide_bind_function)
	{
		DBG1(DBG_TNC, "could not resolve TNC_IMC_ProvideBindFunction in %s: %s\n",
					  path, dlerror());
		destroy(this);
		return NULL;
	}

	return &this->public;
}

/**
 * See header
 */
imc_t* tnc_imc_create_from_functions(char *name,
				TNC_IMC_InitializePointer initialize,
				TNC_IMC_NotifyConnectionChangePointer notify_connection_change,
				TNC_IMC_BeginHandshakePointer begin_handshake,
				TNC_IMC_ReceiveMessagePointer receive_message,
				TNC_IMC_ReceiveMessageLongPointer receive_message_long,
				TNC_IMC_BatchEndingPointer batch_ending,
				TNC_IMC_TerminatePointer terminate,
				TNC_IMC_ProvideBindFunctionPointer provide_bind_function)
{
	private_tnc_imc_t *this;

	this = tnc_imc_create_empty(name);

	this->public.initialize = initialize;
	this->public.notify_connection_change = notify_connection_change;
	this->public.begin_handshake = begin_handshake;
	this->public.receive_message = receive_message;
	this->public.receive_message_long = receive_message_long;
	this->public.batch_ending = batch_ending;
	this->public.terminate = terminate;
	this->public.provide_bind_function = provide_bind_function;

	return &this->public;
}