File: asn1.h

package info (click to toggle)
libpri 1.6.0-1
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 2,696 kB
  • sloc: ansic: 39,045; makefile: 159; sh: 66
file content (257 lines) | stat: -rw-r--r-- 11,184 bytes parent folder | download | duplicates (4)
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
/*
 * libpri: An implementation of Primary Rate ISDN
 *
 * Copyright (C) 2009 Digium, Inc.
 *
 * Richard Mudgett <rmudgett@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2 as published by the
 * Free Software Foundation. See the LICENSE file included with
 * this program for more details.
 *
 * In addition, when this program is distributed with Asterisk in
 * any form that would qualify as a 'combined work' or as a
 * 'derivative work' (but not mere aggregation), you can redistribute
 * and/or modify the combination under the terms of the license
 * provided with that copy of Asterisk, instead of the license
 * terms granted here.
 */

/*!
 * \file
 * \brief ASN.1 definitions and prototypes
 *
 * \details
 * This file contains all ASN.1 primitive data structures and
 * definitions needed for ROSE component encoding and decoding.
 *
 * ROSE - Remote Operations Service Element
 * ASN.1 - Abstract Syntax Notation 1
 * APDU - Application Protocol Data Unit
 *
 * \author Richard Mudgett <rmudgett@digium.com>
 */

#ifndef _LIBPRI_ASN1_H
#define _LIBPRI_ASN1_H

#include <string.h>
#include <sys/types.h>

#ifdef __cplusplus
extern "C" {
#endif

/* ------------------------------------------------------------------- */

/*! ASN.1 Identifier Octet - Tag class bits */
#define ASN1_CLASS_MASK				0xc0
#define ASN1_CLASS_UNIVERSAL		0x00	/*!< Universal primitive data types */
#define ASN1_CLASS_APPLICATION		0x40	/*!< Application wide data tag */
#define ASN1_CLASS_CONTEXT_SPECIFIC	0x80	/*!< Context specifc data tag */
#define ASN1_CLASS_PRIVATE			0xc0	/*!< Private organization data tag */

/*! ASN.1 Identifier Octet - Primitive/Constructor bit */
#define ASN1_PC_MASK				0x20
#define ASN1_PC_PRIMITIVE			0x00
#define ASN1_PC_CONSTRUCTED			0x20

/*! ASN.1 Identifier Octet - Universal data types */
#define ASN1_TYPE_MASK				0x1f
#define ASN1_TYPE_INDEF_TERM		0x00	/*  0 */
#define ASN1_TYPE_BOOLEAN			0x01	/*  1 */
#define ASN1_TYPE_INTEGER			0x02	/*  2 */
#define ASN1_TYPE_BIT_STRING		0x03	/*  3 */
#define ASN1_TYPE_OCTET_STRING		0x04	/*  4 */
#define ASN1_TYPE_NULL				0x05	/*  5 */
#define ASN1_TYPE_OBJECT_IDENTIFIER	0x06	/*  6 */
#define ASN1_TYPE_OBJECT_DESCRIPTOR	0x07	/*  7 */
#define ASN1_TYPE_EXTERN			0x08	/*  8 */
#define ASN1_TYPE_REAL				0x09	/*  9 */
#define ASN1_TYPE_ENUMERATED		0x0a	/* 10 */
#define ASN1_TYPE_EMBEDDED_PDV		0x0b	/* 11 */
#define ASN1_TYPE_UTF8_STRING		0x0c	/* 12 */
#define ASN1_TYPE_RELATIVE_OID		0x0d	/* 13 */
/* 0x0e & 0x0f are reserved for future ASN.1 editions */
#define ASN1_TYPE_SEQUENCE			0x10	/* 16 */
#define ASN1_TYPE_SET				0x11	/* 17 */
#define ASN1_TYPE_NUMERIC_STRING	0x12	/* 18 */
#define ASN1_TYPE_PRINTABLE_STRING	0x13	/* 19 */
#define ASN1_TYPE_TELETEX_STRING	0x14	/* 20 */
#define ASN1_TYPE_VIDEOTEX_STRING	0x15	/* 21 */
#define ASN1_TYPE_IA5_STRING		0x16	/* 22 */
#define ASN1_TYPE_UTC_TIME			0x17	/* 23 */
#define ASN1_TYPE_GENERALIZED_TIME	0x18	/* 24 */
#define ASN1_TYPE_GRAPHIC_STRING	0x19	/* 25 */
#define ASN1_TYPE_VISIBLE_STRING	0x1a	/* 26 */
#define ASN1_TYPE_ISO646_STRING		0x1a	/* 26 */
#define ASN1_TYPE_GENERAL_STRING	0x1b	/* 27 */
#define ASN1_TYPE_UNIVERSAL_STRING	0x1c	/* 28 */
#define ASN1_TYPE_CHAR_STRING		0x1d	/* 29 */
#define ASN1_TYPE_BMP_STRING		0x1e	/* 30 */
#define ASN1_TYPE_EXTENSION			0x1f	/* 31 */

#define ASN1_TAG_SEQUENCE	(ASN1_CLASS_UNIVERSAL | ASN1_PC_CONSTRUCTED | ASN1_TYPE_SEQUENCE)
#define ASN1_TAG_SET		(ASN1_CLASS_UNIVERSAL | ASN1_PC_CONSTRUCTED | ASN1_TYPE_SET)

#define ASN1_INDEF_TERM	(ASN1_CLASS_UNIVERSAL | ASN1_PC_PRIMITIVE | ASN1_TYPE_INDEF_TERM)
#define ASN1_INDEF_TERM_LEN		2

struct asn1_oid {
	/*! \brief Number of subidentifier values in OID list */
	u_int16_t num_values;

	/*!
	 * \brief OID subidentifier value list
	 * \note The first value is really the first two OID subidentifiers.
	 * They are compressed using this formula:
	 * First_Value = (First_Subidentifier * 40) + Second_Subidentifier
	 */
	u_int16_t value[10];
};

#define ASN1_CALL(new_pos, do_it)   \
	do                              \
	{                               \
		(new_pos) = (do_it);        \
		if (!(new_pos)) {           \
			return NULL;            \
		}                           \
	} while (0)

/*! \brief Determine the ending position of the set or sequence to verify the length. */
#define ASN1_END_SETUP(component_end, offset, length, pos, end) \
	do {                                                        \
		if ((length) < 0) {                                     \
			(offset) = ASN1_INDEF_TERM_LEN;                     \
			(component_end) = (end);                            \
		} else {                                                \
			(offset) = 0;                                       \
			(component_end) = (pos) + (length);                 \
		}                                                       \
	} while (0)

/*! \brief Account for the indefinite length terminator of the set or sequence. */
#define ASN1_END_FIXUP(ctrl, pos, offset, component_end, end)                   \
	do {                                                                        \
		if (offset) {                                                           \
			ASN1_CALL((pos), asn1_dec_indef_end_fixup((ctrl), (pos), (end)));   \
		} else if ((pos) != (component_end)) {                                  \
			if ((ctrl)->debug & PRI_DEBUG_APDU) {                               \
				pri_message((ctrl),                                             \
					"  Skipping unused constructed component octets!\n");       \
			}                                                                   \
			(pos) = (component_end);                                            \
		}                                                                       \
	} while (0)

#define ASN1_DID_NOT_EXPECT_TAG(ctrl, tag)                                      \
	do {                                                                        \
		if ((ctrl)->debug & PRI_DEBUG_APDU) {                                   \
			pri_message((ctrl), "  Did not expect: %s\n", asn1_tag2str(tag));   \
		}                                                                       \
	} while (0)

#define ASN1_CHECK_TAG(ctrl, actual_tag, match_tag, expected_tag)   \
	do {                                                            \
		if ((match_tag) != (expected_tag)) {                        \
			ASN1_DID_NOT_EXPECT_TAG((ctrl), (actual_tag));          \
			return NULL;                                            \
		}                                                           \
	} while (0)


const unsigned char *asn1_dec_tag(const unsigned char *tag_pos, const unsigned char *end,
	unsigned *tag);
const unsigned char *asn1_dec_length(const unsigned char *len_pos,
	const unsigned char *end, int *length);
const unsigned char *asn1_dec_indef_end_fixup(struct pri *ctrl, const unsigned char *pos,
	const unsigned char *end);

const unsigned char *asn1_dec_boolean(struct pri *ctrl, const char *name, unsigned tag,
	const unsigned char *pos, const unsigned char *end, int32_t *value);
const unsigned char *asn1_dec_int(struct pri *ctrl, const char *name, unsigned tag,
	const unsigned char *pos, const unsigned char *end, int32_t *value);
const unsigned char *asn1_dec_null(struct pri *ctrl, const char *name, unsigned tag,
	const unsigned char *pos, const unsigned char *end);
const unsigned char *asn1_dec_oid(struct pri *ctrl, const char *name, unsigned tag,
	const unsigned char *pos, const unsigned char *end, struct asn1_oid *oid);
const unsigned char *asn1_dec_string_bin(struct pri *ctrl, const char *name,
	unsigned tag, const unsigned char *pos, const unsigned char *end, size_t buf_size,
	unsigned char *str, size_t *str_len);
const unsigned char *asn1_dec_string_max(struct pri *ctrl, const char *name,
	unsigned tag, const unsigned char *pos, const unsigned char *end, size_t buf_size,
	unsigned char *str, size_t *str_len);

const char *asn1_tag2str(unsigned tag);
void asn1_dump(struct pri *ctrl, const unsigned char *start_asn1,
	const unsigned char *end);


#define ASN1_LEN_FORM_SHORT     1	/*!< Hint that the final length will be less than 128 octets */
#define ASN1_LEN_FORM_LONG_U8   2	/*!< Hint that the final length will be less than 256 octets */
#define ASN1_LEN_FORM_LONG_U16  3	/*!< Hint that the final length will be less than 65536 octets */
#define ASN1_LEN_INIT(len_pos, end, form_hint)  \
	do {                                        \
		if ((end) < (len_pos) + (form_hint)) {  \
			return NULL;                        \
		}                                       \
		*(len_pos) = (form_hint);               \
		(len_pos) += (form_hint);               \
	} while (0)

#define ASN1_LEN_FIXUP(len_pos, component_end, end) \
	ASN1_CALL((component_end), asn1_enc_length_fixup((len_pos), (component_end), (end)))

/*! \brief Use to begin encoding explicit tags, SET, and SEQUENCE constructed groupings. */
#define ASN1_CONSTRUCTED_BEGIN(len_pos_save, pos, end, tag) \
	do {                                                    \
		if ((end) < (pos) + (1 + ASN1_LEN_FORM_SHORT)) {    \
			return NULL;                                    \
		}                                                   \
		*(pos)++ = (tag) | ASN1_PC_CONSTRUCTED;             \
		(len_pos_save) = (pos);                             \
		*(pos) = ASN1_LEN_FORM_SHORT;                       \
		(pos) += ASN1_LEN_FORM_SHORT;                       \
	} while (0)

/*! \brief Use to end encoding explicit tags, SET, and SEQUENCE constructed groupings. */
#define ASN1_CONSTRUCTED_END(len_pos, component_end, end)   \
	ASN1_CALL((component_end), asn1_enc_length_fixup((len_pos), (component_end), (end)))

#define ASN1_ENC_ERROR(ctrl, msg) \
	pri_error((ctrl), "%s error: %s\n", __FUNCTION__, (msg))

unsigned char *asn1_enc_length(unsigned char *len_pos, unsigned char *end,
	size_t str_len);
unsigned char *asn1_enc_length_fixup(unsigned char *len_pos,
	unsigned char *component_end, unsigned char *end);

unsigned char *asn1_enc_boolean(unsigned char *pos, unsigned char *end, unsigned tag,
	int32_t value);
unsigned char *asn1_enc_int(unsigned char *pos, unsigned char *end, unsigned tag,
	int32_t value);
unsigned char *asn1_enc_null(unsigned char *pos, unsigned char *end, unsigned tag);
unsigned char *asn1_enc_oid(unsigned char *pos, unsigned char *end, unsigned tag,
	const struct asn1_oid *oid);
unsigned char *asn1_enc_string_bin(unsigned char *pos, unsigned char *end, unsigned tag,
	const unsigned char *str, size_t str_len);
unsigned char *asn1_enc_string_max(unsigned char *pos, unsigned char *end, unsigned tag,
	const unsigned char *str, size_t max_len);

/* ------------------------------------------------------------------- */

#ifdef __cplusplus
}
#endif

#endif	/* _LIBPRI_ASN1_H */
/* ------------------------------------------------------------------- */
/* end asn1.h */