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/*
* 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
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