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.\" $OpenBSD: ber_oid_cmp.3,v 1.2.2.1 2019/10/27 20:05:12 tb Exp $
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.\"
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.\" Copyright (c) 2007, 2012 Reyk Floeter <reyk@openbsd.org>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.Dd $Mdocdate: October 27 2019 $
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.Dt OBER_OID_CMP 3
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.Os
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.Sh NAME
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.Nm ober_oid_cmp ,
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.Nm ober_oid2ber ,
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.Nm ober_string2oid
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.Nd OID helper functions for the BER library
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.Sh SYNOPSIS
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.In sys/types.h
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.In ber.h
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.Ft "int"
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.Fn "ober_oid_cmp" "struct ber_oid *a" "struct ber_oid *b"
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.Ft "size_t"
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.Fn "ober_oid2ber" "struct ber_oid *oid" "u_int8_t *buf" "size_t size"
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.Ft "int"
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.Fn "ober_string2oid" "const char *string" "struct ber_oid *oid"
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.Sh DESCRIPTION
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Object Identifiers are commonly used in ASN.1-based protocols.
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These functions provide an interface to parse OIDs.
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For internal representation of OIDs, the following structure
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.Vt struct ber_oid
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is being used:
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.Bd -literal
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#define BER_MIN_OID_LEN 2
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#define BER_MAX_OID_LEN 32
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struct ber_oid {
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u_int32_t bo_id[BER_MAX_OID_LEN + 1];
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size_t bo_n;
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};
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.Ed
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.Pp
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The
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.Fn ober_oid2ber
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and
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.Fn ober_string2oid
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functions may be used to convert from and to
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.Vt struct ber_oid .
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.Pp
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.Fn ober_oid_cmp
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may be used to compare two
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.Vt ber_oid
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structures.
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.Sh RETURN VALUES
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.Fn ober_oid2ber
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returns the number of bytes written or 0 on faliure.
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.Pp
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.Fn ober_string2oid
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returns 0 on success or -1 on failure.
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.Pp
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.Fn ober_oid_cmp
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returns 0 when oids
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.Fa a
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and
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.Fa b
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are identical.
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If
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.Fa b
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is a successor of
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.Fa a ,
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1 is returned.
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If
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.Fa b
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is a predecessor of
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.Fa a ,
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-1 is returned.
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If
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.Fa b
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is larger, but a child of
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.Fa a ,
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2 is returned.
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.Sh SEE ALSO
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.Xr ober_add_string 3 ,
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.Xr ober_get_string 3 ,
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.Xr ober_read_elements 3 ,
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.Xr ober_set_header 3
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.Sh HISTORY
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These functions first appeared as internal functions in
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.Xr snmpd 8
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in
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.Ox 4.2
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and were moved to libutil in
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.Ox 6.6 .
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.Sh AUTHORS
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.An -nosplit
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The BER library was written by
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.An Claudio Jeker Aq Mt claudio@openbsd.org ,
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.An Marc Balmer Aq Mt marc@openbsd.org
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and
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.An Reyk Floeter Aq Mt reyk@openbsd.org .
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