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1.1 misho 1: /*
2: * Copyright (C) 2014 Andreas Steffen
3: * HSR Hochschule fuer Technik Rapperswil
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #include "tcg_seg_attr_max_size.h"
17:
18: #include <pa_tnc/pa_tnc_msg.h>
19: #include <bio/bio_writer.h>
20: #include <bio/bio_reader.h>
21: #include <utils/debug.h>
22:
23: typedef struct private_tcg_seg_attr_max_size_t private_tcg_seg_attr_max_size_t;
24:
25: /**
26: * Maximum Attribute Size Request/Response
27: * see TCG IF-M Segmentation Specification
28: *
29: * 1 2 3
30: * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
31: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
32: * | Max Attribute Size |
33: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
34: * | Max Segment Size |
35: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
36: */
37:
38: /**
39: * Private data of an tcg_seg_attr_max_size_t object.
40: */
41: struct private_tcg_seg_attr_max_size_t {
42:
43: /**
44: * Public members of tcg_seg_attr_max_size_t
45: */
46: tcg_seg_attr_max_size_t public;
47:
48: /**
49: * Vendor-specific attribute type
50: */
51: pen_type_t type;
52:
53: /**
54: * Length of attribute value
55: */
56: size_t length;
57:
58: /**
59: * Attribute value or segment
60: */
61: chunk_t value;
62:
63: /**
64: * Noskip flag
65: */
66: bool noskip_flag;
67:
68: /**
69: * Maximum IF-M attribute size in octets
70: */
71: uint32_t max_attr_size;
72:
73: /**
74: * Maximum IF-M attribute segment size in octets
75: */
76: uint32_t max_seg_size;
77:
78: /**
79: * Reference count
80: */
81: refcount_t ref;
82: };
83:
84: METHOD(pa_tnc_attr_t, get_type, pen_type_t,
85: private_tcg_seg_attr_max_size_t *this)
86: {
87: return this->type;
88: }
89:
90: METHOD(pa_tnc_attr_t, get_value, chunk_t,
91: private_tcg_seg_attr_max_size_t *this)
92: {
93: return this->value;
94: }
95:
96: METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
97: private_tcg_seg_attr_max_size_t *this)
98: {
99: return this->noskip_flag;
100: }
101:
102: METHOD(pa_tnc_attr_t, set_noskip_flag,void,
103: private_tcg_seg_attr_max_size_t *this, bool noskip)
104: {
105: this->noskip_flag = noskip;
106: }
107:
108: METHOD(pa_tnc_attr_t, build, void,
109: private_tcg_seg_attr_max_size_t *this)
110: {
111: bio_writer_t *writer;
112:
113: if (this->value.ptr)
114: {
115: return;
116: }
117: writer = bio_writer_create(TCG_SEG_ATTR_MAX_SIZE_SIZE);
118: writer->write_uint32(writer, this->max_attr_size);
119: writer->write_uint32(writer, this->max_seg_size);
120:
121: this->value = writer->extract_buf(writer);
122: this->length = this->value.len;
123: writer->destroy(writer);
124: }
125:
126: METHOD(pa_tnc_attr_t, process, status_t,
127: private_tcg_seg_attr_max_size_t *this, uint32_t *offset)
128: {
129: bio_reader_t *reader;
130:
131: *offset = 0;
132:
133: if (this->value.len < this->length)
134: {
135: return NEED_MORE;
136: }
137: if (this->value.len < TCG_SEG_ATTR_MAX_SIZE_SIZE)
138: {
139: DBG1(DBG_TNC, "insufficient data for %N", tcg_attr_names,
140: this->type.type);
141: return FAILED;
142: }
143: reader = bio_reader_create(this->value);
144: reader->read_uint32(reader, &this->max_attr_size);
145: reader->read_uint32(reader, &this->max_seg_size);
146: reader->destroy(reader);
147:
148: return SUCCESS;
149: }
150:
151: METHOD(pa_tnc_attr_t, add_segment, void,
152: private_tcg_seg_attr_max_size_t *this, chunk_t segment)
153: {
154: this->value = chunk_cat("mc", this->value, segment);
155: }
156:
157: METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
158: private_tcg_seg_attr_max_size_t *this)
159: {
160: ref_get(&this->ref);
161: return &this->public.pa_tnc_attribute;
162: }
163:
164: METHOD(pa_tnc_attr_t, destroy, void,
165: private_tcg_seg_attr_max_size_t *this)
166: {
167: if (ref_put(&this->ref))
168: {
169: free(this->value.ptr);
170: free(this);
171: }
172: }
173:
174: METHOD(tcg_seg_attr_max_size_t, get_attr_size, void,
175: private_tcg_seg_attr_max_size_t *this, uint32_t *max_attr_size,
176: uint32_t *max_seg_size)
177: {
178: if (max_attr_size)
179: {
180: *max_attr_size = this->max_attr_size;
181: }
182: if (max_seg_size)
183: {
184: *max_seg_size = this->max_seg_size;
185: }
186: }
187:
188: /**
189: * Described in header.
190: */
191: pa_tnc_attr_t* tcg_seg_attr_max_size_create(uint32_t max_attr_size,
192: uint32_t max_seg_size,
193: bool request)
194: {
195: private_tcg_seg_attr_max_size_t *this;
196:
197: INIT(this,
198: .public = {
199: .pa_tnc_attribute = {
200: .get_type = _get_type,
201: .get_value = _get_value,
202: .get_noskip_flag = _get_noskip_flag,
203: .set_noskip_flag = _set_noskip_flag,
204: .build = _build,
205: .process = _process,
206: .add_segment = _add_segment,
207: .get_ref = _get_ref,
208: .destroy = _destroy,
209: },
210: .get_attr_size = _get_attr_size,
211: },
212: .type = { PEN_TCG, request ? TCG_SEG_MAX_ATTR_SIZE_REQ :
213: TCG_SEG_MAX_ATTR_SIZE_RESP },
214: .max_attr_size = max_attr_size,
215: .max_seg_size = max_seg_size,
216: .ref = 1,
217: );
218:
219: return &this->public.pa_tnc_attribute;
220: }
221:
222: /**
223: * Described in header.
224: */
225: pa_tnc_attr_t *tcg_seg_attr_max_size_create_from_data(size_t length,
226: chunk_t data,
227: bool request)
228: {
229: private_tcg_seg_attr_max_size_t *this;
230:
231: INIT(this,
232: .public = {
233: .pa_tnc_attribute = {
234: .get_type = _get_type,
235: .get_value = _get_value,
236: .get_noskip_flag = _get_noskip_flag,
237: .set_noskip_flag = _set_noskip_flag,
238: .build = _build,
239: .process = _process,
240: .add_segment = _add_segment,
241: .get_ref = _get_ref,
242: .destroy = _destroy,
243: },
244: .get_attr_size = _get_attr_size,
245: },
246: .type = { PEN_TCG, request ? TCG_SEG_MAX_ATTR_SIZE_REQ :
247: TCG_SEG_MAX_ATTR_SIZE_RESP },
248: .length = length,
249: .value = chunk_clone(data),
250: .ref = 1,
251: );
252:
253: return &this->public.pa_tnc_attribute;
254: }