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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_seg_env.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_seg_env_t private_tcg_seg_attr_seg_env_t;
24:
25: /**
26: * Attribute Segment Envelope
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: * |M|S| Reserved | Base Attribute ID |
33: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
34: * | Segment Value (Variable Length) |
35: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
36: */
37:
38: /**
39: * Private data of an tcg_seg_attr_seg_env_t object.
40: */
41: struct private_tcg_seg_attr_seg_env_t {
42:
43: /**
44: * Public members of tcg_seg_attr_seg_env_t
45: */
46: tcg_seg_attr_seg_env_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: * PA-TNC segmentation flags
70: */
71: uint8_t flags;
72:
73: /**
74: * Base Attribute ID
75: */
76: uint32_t base_attr_id;
77:
78: /**
79: * Attribute value
80: */
81: chunk_t segment;
82:
83: /**
84: * Reference count
85: */
86: refcount_t ref;
87: };
88:
89: METHOD(pa_tnc_attr_t, get_type, pen_type_t,
90: private_tcg_seg_attr_seg_env_t *this)
91: {
92: return this->type;
93: }
94:
95: METHOD(pa_tnc_attr_t, get_value, chunk_t,
96: private_tcg_seg_attr_seg_env_t *this)
97: {
98: return this->value;
99: }
100:
101: METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
102: private_tcg_seg_attr_seg_env_t *this)
103: {
104: return this->noskip_flag;
105: }
106:
107: METHOD(pa_tnc_attr_t, set_noskip_flag,void,
108: private_tcg_seg_attr_seg_env_t *this, bool noskip)
109: {
110: this->noskip_flag = noskip;
111: }
112:
113: METHOD(pa_tnc_attr_t, build, void,
114: private_tcg_seg_attr_seg_env_t *this)
115: {
116: /* constructor already allocated and built value */
117: this->length = this->value.len;
118: return;
119: }
120:
121: METHOD(pa_tnc_attr_t, process, status_t,
122: private_tcg_seg_attr_seg_env_t *this, uint32_t *offset)
123: {
124: bio_reader_t *reader;
125:
126: *offset = 0;
127:
128: if (this->value.len < this->length)
129: {
130: DBG1(DBG_TNC, "segmentation not allowed for %N/%N", pen_names, PEN_TCG,
131: tcg_attr_names, this->type.type);
132: return FAILED;
133: }
134: if (this->value.len < TCG_SEG_ATTR_SEG_ENV_HEADER)
135: {
136: DBG1(DBG_TNC, "insufficient data for %N/%N", pen_names, PEN_TCG,
137: tcg_attr_names, this->type.type);
138: return FAILED;
139: }
140: reader = bio_reader_create(this->value);
141: reader->read_uint8 (reader, &this->flags);
142: reader->read_uint24(reader, &this->base_attr_id);
143: reader->destroy(reader);
144:
145: return SUCCESS;
146: }
147:
148: METHOD(pa_tnc_attr_t, add_segment, void,
149: private_tcg_seg_attr_seg_env_t *this, chunk_t segment)
150: {
151: /* no segments are expected */
152: }
153:
154: METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
155: private_tcg_seg_attr_seg_env_t *this)
156: {
157: ref_get(&this->ref);
158: return &this->public.pa_tnc_attribute;
159: }
160:
161: METHOD(pa_tnc_attr_t, destroy, void,
162: private_tcg_seg_attr_seg_env_t *this)
163: {
164: if (ref_put(&this->ref))
165: {
166: free(this->value.ptr);
167: free(this);
168: }
169: }
170:
171: METHOD(tcg_seg_attr_seg_env_t, get_segment, chunk_t,
172: private_tcg_seg_attr_seg_env_t *this, uint8_t *flags)
173: {
174: if (flags)
175: {
176: *flags = this->flags;
177: }
178: return chunk_skip(this->value, TCG_SEG_ATTR_SEG_ENV_HEADER);
179: }
180:
181: METHOD(tcg_seg_attr_seg_env_t, get_base_attr_id, uint32_t,
182: private_tcg_seg_attr_seg_env_t *this)
183: {
184: return this->base_attr_id;
185: }
186:
187: /**
188: * Described in header.
189: */
190: pa_tnc_attr_t* tcg_seg_attr_seg_env_create(chunk_t segment, uint8_t flags,
191: uint32_t base_attr_id)
192: {
193: private_tcg_seg_attr_seg_env_t *this;
194:
195: INIT(this,
196: .public = {
197: .pa_tnc_attribute = {
198: .get_type = _get_type,
199: .get_value = _get_value,
200: .get_noskip_flag = _get_noskip_flag,
201: .set_noskip_flag = _set_noskip_flag,
202: .build = _build,
203: .process = _process,
204: .add_segment = _add_segment,
205: .get_ref = _get_ref,
206: .destroy = _destroy,
207: },
208: .get_base_attr_id = _get_base_attr_id,
209: .get_segment = _get_segment,
210: },
211: .type = { PEN_TCG, TCG_SEG_ATTR_SEG_ENV },
212: .flags = flags,
213: .base_attr_id = base_attr_id,
214: .value = chunk_alloc(TCG_SEG_ATTR_SEG_ENV_HEADER + segment.len),
215: .ref = 1,
216: );
217:
218: htoun32(this->value.ptr, base_attr_id);
219: *this->value.ptr = flags;
220: memcpy(this->value.ptr + TCG_SEG_ATTR_SEG_ENV_HEADER,
221: segment.ptr, segment.len);
222:
223: return &this->public.pa_tnc_attribute;
224: }
225:
226: /**
227: * Described in header.
228: */
229: pa_tnc_attr_t *tcg_seg_attr_seg_env_create_from_data(size_t length,
230: chunk_t data)
231: {
232: private_tcg_seg_attr_seg_env_t *this;
233:
234: INIT(this,
235: .public = {
236: .pa_tnc_attribute = {
237: .get_type = _get_type,
238: .get_value = _get_value,
239: .get_noskip_flag = _get_noskip_flag,
240: .set_noskip_flag = _set_noskip_flag,
241: .build = _build,
242: .process = _process,
243: .add_segment = _add_segment,
244: .get_ref = _get_ref,
245: .destroy = _destroy,
246: },
247: .get_base_attr_id = _get_base_attr_id,
248: .get_segment = _get_segment,
249: },
250: .type = { PEN_TCG, TCG_SEG_ATTR_SEG_ENV },
251: .length = length,
252: .value = chunk_clone(data),
253: .ref = 1,
254: );
255:
256: return &this->public.pa_tnc_attribute;
257: }