summaryrefslogtreecommitdiff
path: root/daemon/bsnmp/asn1.h
blob: 23b7814499e747201fa3936eaea0bc3606de94f9 (plain)
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
/*
 * Copyright (c) 2001-2003
 *	Fraunhofer Institute for Open Communication Systems (FhG Fokus).
 *	All rights reserved.
 *
 * Author: Harti Brandt <harti@freebsd.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Begemot: bsnmp/lib/asn1.h,v 1.18 2004/08/06 08:46:50 brandt Exp $
 *
 * ASN.1 for SNMP
 */
#ifndef asn1_h_
#define asn1_h_

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

struct asn_buf {
	union {
		u_char	*ptr;
		const u_char *cptr;
	}	asn_u;
	size_t	asn_len;
};
#define asn_cptr	asn_u.cptr
#define asn_ptr	asn_u.ptr

/* these restrictions are in the SMI */
#define ASN_MAXID	0xffffffff
#define ASN_MAXOIDLEN	128

/* the string needed for this (with trailing zero) */
#define ASN_OIDSTRLEN	(ASN_MAXOIDLEN * (10 + 1) - 1 + 1)

/* type of subidentifiers */
typedef uint32_t asn_subid_t;

struct asn_oid {
	u_int	len;
	asn_subid_t subs[ASN_MAXOIDLEN];
};

enum asn_err {
	/* conversion was ok */
	ASN_ERR_OK	= 0,
	/* conversion failed and stopped */
	ASN_ERR_FAILED	= 1 | 0x1000,
	/* length field bad, value skipped */
	ASN_ERR_BADLEN	= 2,
	/* out of buffer, stopped */
	ASN_ERR_EOBUF	= 3 | 0x1000,
	/* length ok, but value is out of range */
	ASN_ERR_RANGE	= 4,
	/* not the expected tag, stopped */
	ASN_ERR_TAG	= 5 | 0x1000,
};
#define ASN_ERR_STOPPED(E) (((E) & 0x1000) != 0)

/* type for the length field of encoded values. The length is restricted
 * to 65535, but using uint16_t would give conversion warnings on gcc */
typedef uint32_t asn_len_t;	/* could be also uint16_t */

/* maximal length of a long length field without the length of the length */
#define ASN_MAXLEN	65535
#define ASN_MAXLENLEN	2	/* number of bytes in a length */

/* maximum size of an octet string as per SMIv2 */
#define ASN_MAXOCTETSTRING 65535

extern void (*asn_error)(const struct asn_buf *, const char *, ...);

enum asn_err asn_get_header(struct asn_buf *, u_char *, asn_len_t *);
enum asn_err asn_put_header(struct asn_buf *, u_char, asn_len_t);

enum asn_err asn_put_temp_header(struct asn_buf *, u_char, u_char **);
enum asn_err asn_commit_header(struct asn_buf *, u_char *);

enum asn_err asn_get_integer_raw(struct asn_buf *, asn_len_t, int32_t *);
enum asn_err asn_get_integer(struct asn_buf *, int32_t *);
enum asn_err asn_put_integer(struct asn_buf *, int32_t);

enum asn_err asn_get_octetstring_raw(struct asn_buf *, asn_len_t, u_char *, u_int *);
enum asn_err asn_get_octetstring(struct asn_buf *, u_char *, u_int *);
enum asn_err asn_put_octetstring(struct asn_buf *, const u_char *, u_int);

enum asn_err asn_get_null_raw(struct asn_buf *b, asn_len_t);
enum asn_err asn_get_null(struct asn_buf *);
enum asn_err asn_put_null(struct asn_buf *);

enum asn_err asn_put_exception(struct asn_buf *, u_int);

enum asn_err asn_get_objid_raw(struct asn_buf *, asn_len_t, struct asn_oid *);
enum asn_err asn_get_objid(struct asn_buf *, struct asn_oid *);
enum asn_err asn_put_objid(struct asn_buf *, const struct asn_oid *);

enum asn_err asn_get_sequence(struct asn_buf *, asn_len_t *);

enum asn_err asn_get_ipaddress_raw(struct asn_buf *, asn_len_t, u_char *);
enum asn_err asn_get_ipaddress(struct asn_buf *, u_char *);
enum asn_err asn_put_ipaddress(struct asn_buf *, const u_char *);

enum asn_err asn_get_uint32_raw(struct asn_buf *, asn_len_t, uint32_t *);
enum asn_err asn_put_uint32(struct asn_buf *, u_char, uint32_t);

enum asn_err asn_get_counter64_raw(struct asn_buf *, asn_len_t, uint64_t *);
enum asn_err asn_put_counter64(struct asn_buf *, uint64_t);

enum asn_err asn_get_timeticks(struct asn_buf *, uint32_t *);
enum asn_err asn_put_timeticks(struct asn_buf *, uint32_t);

enum asn_err asn_skip(struct asn_buf *, asn_len_t);

/*
 * Utility functions for OIDs
 */
/* get a sub-OID from the middle of another OID */
void asn_slice_oid(struct asn_oid *, const struct asn_oid *, u_int, u_int);

/* append an OID to another one */
void asn_append_oid(struct asn_oid *, const struct asn_oid *);

/* compare two OIDs */
int asn_compare_oid(const struct asn_oid *, const struct asn_oid *);

/* check whether the first is a suboid of the second one */
int asn_is_suboid(const struct asn_oid *, const struct asn_oid *);

/* format an OID into a user buffer of size ASN_OIDSTRLEN */
char *asn_oid2str_r(const struct asn_oid *, char *);

/* format an OID into a private static buffer */
char *asn_oid2str(const struct asn_oid *);

enum {
	ASN_TYPE_BOOLEAN	= 0x01,
	ASN_TYPE_INTEGER	= 0x02,
	ASN_TYPE_BITSTRING	= 0x03,
	ASN_TYPE_OCTETSTRING	= 0x04,
	ASN_TYPE_NULL		= 0x05,
	ASN_TYPE_OBJID		= 0x06,
	ASN_TYPE_SEQUENCE	= 0x10,

	ASN_TYPE_CONSTRUCTED	= 0x20,
	ASN_CLASS_UNIVERSAL	= 0x00,
	ASN_CLASS_APPLICATION	= 0x40,
	ASN_CLASS_CONTEXT	= 0x80,
	ASN_CLASS_PRIVATE	= 0xc0,
	ASN_TYPE_MASK		= 0x1f,

	ASN_APP_IPADDRESS	= 0x00,
	ASN_APP_COUNTER		= 0x01,
	ASN_APP_GAUGE		= 0x02,
	ASN_APP_TIMETICKS	= 0x03,
	ASN_APP_OPAQUE		= 0x04,	/* not implemented */
	ASN_APP_COUNTER64	= 0x06,

	ASN_EXCEPT_NOSUCHOBJECT	= 0x00,
	ASN_EXCEPT_NOSUCHINSTANCE = 0x01,
	ASN_EXCEPT_ENDOFMIBVIEW	= 0x02,
};

#endif