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1.1 misho 1: /*
2: * Copyright (C) 2015 Tobias Brunner
3: * Copyright (C) 2005-2006 Martin Willi
4: * Copyright (C) 2005 Jan Hutter
5: * HSR Hochschule fuer Technik Rapperswil
6: *
7: * This program is free software; you can redistribute it and/or modify it
8: * under the terms of the GNU General Public License as published by the
9: * Free Software Foundation; either version 2 of the License, or (at your
10: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
11: *
12: * This program is distributed in the hope that it will be useful, but
13: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15: * for more details.
16: */
17:
18: #include <stddef.h>
19:
20: #include "unknown_payload.h"
21:
22: typedef struct private_unknown_payload_t private_unknown_payload_t;
23:
24: /**
25: * Private data of an unknown_payload_t object.
26: */
27: struct private_unknown_payload_t {
28:
29: /**
30: * Public unknown_payload_t interface.
31: */
32: unknown_payload_t public;
33:
34: /**
35: * Type of this payload
36: */
37: payload_type_t type;
38:
39: /**
40: * Next payload type.
41: */
42: uint8_t next_payload;
43:
44: /**
45: * Critical flag.
46: */
47: bool critical;
48:
49: /**
50: * Reserved bits
51: */
52: bool reserved[7];
53:
54: /**
55: * Length of this payload.
56: */
57: uint16_t payload_length;
58:
59: /**
60: * The contained data.
61: */
62: chunk_t data;
63: };
64:
65: /**
66: * Encoding rules to parse an payload which is not further specified.
67: *
68: * The defined offsets are the positions in a object of type
69: * private_unknown_payload_t.
70: *
71: */
72: static encoding_rule_t encodings[] = {
73: /* 1 Byte next payload type, stored in the field next_payload */
74: { U_INT_8, offsetof(private_unknown_payload_t, next_payload) },
75: /* the critical bit */
76: { FLAG, offsetof(private_unknown_payload_t, critical) },
77: /* 7 Bit reserved bits */
78: { RESERVED_BIT, offsetof(private_unknown_payload_t, reserved[0]) },
79: { RESERVED_BIT, offsetof(private_unknown_payload_t, reserved[1]) },
80: { RESERVED_BIT, offsetof(private_unknown_payload_t, reserved[2]) },
81: { RESERVED_BIT, offsetof(private_unknown_payload_t, reserved[3]) },
82: { RESERVED_BIT, offsetof(private_unknown_payload_t, reserved[4]) },
83: { RESERVED_BIT, offsetof(private_unknown_payload_t, reserved[5]) },
84: { RESERVED_BIT, offsetof(private_unknown_payload_t, reserved[6]) },
85: /* Length of the whole payload*/
86: { PAYLOAD_LENGTH, offsetof(private_unknown_payload_t, payload_length) },
87: /* some unknown data bytes, length is defined in PAYLOAD_LENGTH */
88: { CHUNK_DATA, offsetof(private_unknown_payload_t, data) },
89: };
90:
91: /*
92: 1 2 3
93: 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
94: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
95: ! Next Payload !C! RESERVED ! Payload Length !
96: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
97: ! !
98: ~ Data of any type ~
99: ! !
100: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
101: */
102:
103: METHOD(payload_t, verify, status_t,
104: private_unknown_payload_t *this)
105: {
106: return SUCCESS;
107: }
108:
109: METHOD(payload_t, get_encoding_rules, int,
110: private_unknown_payload_t *this, encoding_rule_t **rules)
111: {
112: *rules = encodings;
113: return countof(encodings);
114: }
115:
116: METHOD(payload_t, get_header_length, int,
117: private_unknown_payload_t *this)
118: {
119: return 4;
120: }
121:
122: METHOD(payload_t, get_payload_type, payload_type_t,
123: private_unknown_payload_t *this)
124: {
125: return PL_UNKNOWN;
126: }
127:
128: METHOD(unknown_payload_t, get_type, payload_type_t,
129: private_unknown_payload_t *this)
130: {
131: return this->type;
132: }
133:
134: METHOD(payload_t, get_next_type, payload_type_t,
135: private_unknown_payload_t *this)
136: {
137: return this->next_payload;
138: }
139:
140: METHOD(payload_t, set_next_type, void,
141: private_unknown_payload_t *this,payload_type_t type)
142: {
143: this->next_payload = type;
144: }
145:
146: METHOD(payload_t, get_length, size_t,
147: private_unknown_payload_t *this)
148: {
149: return this->payload_length;
150: }
151:
152: METHOD(unknown_payload_t, is_critical, bool,
153: private_unknown_payload_t *this)
154: {
155: return this->critical;
156: }
157:
158: METHOD(unknown_payload_t, get_data, chunk_t,
159: private_unknown_payload_t *this)
160: {
161: return this->data;
162: }
163:
164: METHOD2(payload_t, unknown_payload_t, destroy, void,
165: private_unknown_payload_t *this)
166: {
167: free(this->data.ptr);
168: free(this);
169: }
170:
171: /*
172: * Described in header
173: */
174: unknown_payload_t *unknown_payload_create(payload_type_t type)
175: {
176: private_unknown_payload_t *this;
177:
178: INIT(this,
179: .public = {
180: .payload_interface = {
181: .verify = _verify,
182: .get_encoding_rules = _get_encoding_rules,
183: .get_header_length = _get_header_length,
184: .get_length = _get_length,
185: .get_next_type = _get_next_type,
186: .set_next_type = _set_next_type,
187: .get_type = _get_payload_type,
188: .destroy = _destroy,
189: },
190: .is_critical = _is_critical,
191: .get_type = _get_type,
192: .get_data = _get_data,
193: .destroy = _destroy,
194: },
195: .next_payload = PL_NONE,
196: .payload_length = get_header_length(this),
197: .type = type,
198: );
199:
200: return &this->public;
201: }
202:
203:
204: /*
205: * Described in header
206: */
207: unknown_payload_t *unknown_payload_create_data(payload_type_t type,
208: bool critical, chunk_t data)
209: {
210: private_unknown_payload_t *this;
211:
212: this = (private_unknown_payload_t*)unknown_payload_create(type);
213: this->data = data;
214: this->critical = critical;
215: this->payload_length = get_header_length(this) + data.len;
216:
217: return &this->public;
218: }