2 * @file transform_attribute.c
4 * @brief Declaration of the class transform_attribute_t.
6 * An object of this type represents an IKEv2 TRANSFORM attribute.
11 * Copyright (C) 2005 Jan Hutter, Martin Willi
12 * Hochschule fuer Technik Rapperswil
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the License, or (at your
17 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
21 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
28 #include "transform_attribute.h"
30 #include "encodings.h"
32 #include "../utils/allocator.h"
35 * Private data of an transform_attribute_t Object
38 typedef struct private_transform_attribute_s private_transform_attribute_t
;
40 struct private_transform_attribute_s
{
42 * public transform_attribute_t interface
44 transform_attribute_t
public;
47 * Attribute Format Flag
49 * - TRUE means value is stored in attribute_length_or_value
50 * - FALSE means value is stored in attribute_value
52 bool attribute_format
;
55 * Type of the attribute
57 u_int16_t attribute_type
;
60 * Attribute Length if attribute_format is 0, attribute Value otherwise
62 u_int16_t attribute_length_or_value
;
65 * Attribute value as chunk if attribute_format is 0 (FALSE)
67 chunk_t attribute_value
;
73 * string mappings for transform_attribute_type_t
75 mapping_t transform_attribute_type_m
[] = {
76 {ATTRIBUTE_UNDEFINED
, "ATTRIBUTE_UNDEFINED"},
77 {KEY_LENGTH
, "KEY_LENGTH"},
82 * Encoding rules to parse or generate a Transform attribute
84 * The defined offsets are the positions in a object of type
85 * private_transform_attribute_t.
88 encoding_rule_t transform_attribute_encodings
[] = {
89 /* Flag defining the format of this payload */
90 { ATTRIBUTE_FORMAT
, offsetof(private_transform_attribute_t
, attribute_format
) },
91 /* type of the attribute as 15 bit unsigned integer */
92 { ATTRIBUTE_TYPE
, offsetof(private_transform_attribute_t
, attribute_type
) },
93 /* Length or value, depending on the attribute format flag */
94 { ATTRIBUTE_LENGTH_OR_VALUE
, offsetof(private_transform_attribute_t
, attribute_length_or_value
) },
95 /* Value of attribute if attribute format flag is zero */
96 { ATTRIBUTE_VALUE
, offsetof(private_transform_attribute_t
, attribute_value
) }
100 * Implements payload_t's and transform_attribute_t's destroy function.
101 * See #payload_s.destroy or transform_attribute_s.destroy for description.
103 static status_t
destroy(private_transform_attribute_t
*this)
105 if (this->attribute_value
.ptr
!= NULL
)
107 allocator_free(this->attribute_value
.ptr
);
109 allocator_free(this);
115 * Implements payload_t's get_encoding_rules function.
116 * See #payload_s.get_encoding_rules for description.
118 static status_t
get_encoding_rules(private_transform_attribute_t
*this, encoding_rule_t
**rules
, size_t *rule_count
)
120 *rules
= transform_attribute_encodings
;
121 *rule_count
= sizeof(transform_attribute_encodings
) / sizeof(encoding_rule_t
);
127 * Implements payload_t's get_type function.
128 * See #payload_s.get_type for description.
130 static payload_type_t
get_type(private_transform_attribute_t
*this)
132 return TRANSFORM_ATTRIBUTE
;
136 * Implements payload_t's get_next_type function.
137 * See #payload_s.get_next_type for description.
139 static payload_type_t
get_next_type(private_transform_attribute_t
*this)
145 * Implements payload_t's set_next_type function.
146 * See #payload_s.set_next_type for description.
148 static status_t
set_next_type(private_transform_attribute_t
*this,payload_type_t type
)
154 * Implements payload_t's get_length function.
155 * See #payload_s.get_length for description.
157 static size_t get_length(private_transform_attribute_t
*this)
159 if (this->attribute_format
== TRUE
)
161 /*Attribute size is only 4 byte */
164 return (this->attribute_length_or_value
+ 4);
167 * Implements transform_attribute_t's set_value function.
168 * See #transform_attribute_s.set_value for description.
170 static status_t
set_value_chunk(private_transform_attribute_t
*this, chunk_t value
)
172 if (this->attribute_value
.ptr
!= NULL
)
174 /* free existing value */
175 allocator_free(this->attribute_value
.ptr
);
176 this->attribute_value
.ptr
= NULL
;
177 this->attribute_value
.len
= 0;
183 this->attribute_value
.ptr
= allocator_clone_bytes(value
.ptr
,value
.len
);
184 if (this->attribute_value
.ptr
== NULL
)
188 this->attribute_value
.len
= value
.len
;
189 this->attribute_length_or_value
= value
.len
;
190 /* attribute has not a fixed length */
191 this->attribute_format
= FALSE
;
195 memcpy(&(this->attribute_length_or_value
),value
.ptr
,value
.len
);
201 * Implements transform_attribute_t's set_value function.
202 * See #transform_attribute_s.set_value for description.
204 static status_t
set_value(private_transform_attribute_t
*this, u_int16_t value
)
206 if (this->attribute_value
.ptr
!= NULL
)
208 /* free existing value */
209 allocator_free(this->attribute_value
.ptr
);
210 this->attribute_value
.ptr
= NULL
;
211 this->attribute_value
.len
= 0;
214 this->attribute_length_or_value
= value
;
219 * Implements transform_attribute_t's get_value_chunk function.
220 * See #transform_attribute_s.get_value_chunk for description.
222 static chunk_t
get_value_chunk (private_transform_attribute_t
*this)
226 if (this->attribute_format
== FALSE
)
228 value
.ptr
= this->attribute_value
.ptr
;
229 value
.len
= this->attribute_value
.len
;
233 value
.ptr
= (void *) &(this->attribute_length_or_value
);
241 * Implements transform_attribute_t's get_value function.
242 * See #transform_attribute_s.get_value for description.
244 static u_int16_t
get_value (private_transform_attribute_t
*this)
246 return this->attribute_length_or_value
;
251 * Implements transform_attribute_t's set_attribute_type function.
252 * See #transform_attribute_s.set_attribute_type for description.
254 static status_t
set_attribute_type (private_transform_attribute_t
*this, u_int16_t type
)
256 this->attribute_type
= type
& 0x7FFF;
261 * Implements transform_attribute_t's get_attribute_type function.
262 * See #transform_attribute_s.get_attribute_type for description.
264 static u_int16_t
get_attribute_type (private_transform_attribute_t
*this)
266 return this->attribute_type
;
270 * Described in header
272 transform_attribute_t
*transform_attribute_create()
274 private_transform_attribute_t
*this = allocator_alloc_thing(private_transform_attribute_t
);
280 this->public.payload_interface
.get_encoding_rules
= (status_t (*) (payload_t
*, encoding_rule_t
**, size_t *) ) get_encoding_rules
;
281 this->public.payload_interface
.get_length
= (size_t (*) (payload_t
*)) get_length
;
282 this->public.payload_interface
.get_next_type
= (payload_type_t (*) (payload_t
*)) get_next_type
;
283 this->public.payload_interface
.set_next_type
= (status_t (*) (payload_t
*,payload_type_t
)) set_next_type
;
284 this->public.payload_interface
.get_type
= (payload_type_t (*) (payload_t
*)) get_type
;
285 this->public.payload_interface
.destroy
= (status_t (*) (payload_t
*))destroy
;
286 this->public.set_value_chunk
= (status_t (*) (transform_attribute_t
*,chunk_t
)) set_value_chunk
;
287 this->public.set_value
= (status_t (*) (transform_attribute_t
*,u_int16_t
)) set_value
;
288 this->public.get_value_chunk
= (chunk_t (*) (transform_attribute_t
*)) get_value_chunk
;
289 this->public.get_value
= (u_int16_t (*) (transform_attribute_t
*)) get_value
;
290 this->public.set_attribute_type
= (status_t (*) (transform_attribute_t
*,u_int16_t type
)) set_attribute_type
;
291 this->public.get_attribute_type
= (u_int16_t (*) (transform_attribute_t
*)) get_attribute_type
;
292 this->public.destroy
= (status_t (*) (transform_attribute_t
*)) destroy
;
294 /* set default values of the fields */
295 this->attribute_format
= TRUE
;
296 this->attribute_type
= 0;
297 this->attribute_length_or_value
= 0;
298 this->attribute_value
.ptr
= NULL
;
299 this->attribute_value
.len
= 0;
301 return (&(this->public));