1.\" $OpenBSD: ober_oid_cmp.3,v 1.5 2021/10/21 08:17:34 martijn Exp $ 2.\" 3.\" Copyright (c) 2007, 2012 Reyk Floeter <reyk@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: October 21 2021 $ 18.Dt OBER_OID_CMP 3 19.Os 20.Sh NAME 21.Nm ober_oid_cmp , 22.Nm ober_oid2ber , 23.Nm ober_string2oid 24.Nd OID helper functions for the BER library 25.Sh SYNOPSIS 26.In sys/types.h 27.In ber.h 28.Ft "int" 29.Fn "ober_oid_cmp" "struct ber_oid *a" "struct ber_oid *b" 30.Ft "size_t" 31.Fn "ober_oid2ber" "struct ber_oid *oid" "u_int8_t *buf" "size_t size" 32.Ft "int" 33.Fn "ober_string2oid" "const char *string" "struct ber_oid *oid" 34.Sh DESCRIPTION 35Object Identifiers are commonly used in ASN.1-based protocols. 36These functions provide an interface to parse OIDs. 37For internal representation of OIDs, the following structure 38.Vt struct ber_oid 39is being used: 40.Bd -literal 41#define BER_MIN_OID_LEN 2 42#define BER_MAX_OID_LEN 64 43 44struct ber_oid { 45 u_int32_t bo_id[BER_MAX_OID_LEN + 1]; 46 size_t bo_n; 47}; 48.Ed 49.Pp 50The 51.Fn ober_oid2ber 52and 53.Fn ober_string2oid 54functions may be used to convert from and to 55.Vt struct ber_oid . 56.Pp 57.Fn ober_oid_cmp 58may be used to compare two 59.Vt ber_oid 60structures. 61.Sh RETURN VALUES 62.Fn ober_oid2ber 63returns the number of bytes written or 0 on failure. 64.Pp 65.Fn ober_string2oid 66returns 0 on success or -1 on failure. 67.Pp 68.Fn ober_oid_cmp 69returns an integer greater than, equal to, or less than 0, according to whether 70the oid 71.Fa a 72is greater than, equal to, or less than the oid 73.Fa b . 74If the shortest length from 75.Fa a 76and 77.Fa b 78matches 79the weight of the integer is 2, else it is 1. 80.Sh SEE ALSO 81.Xr ober_add_string 3 , 82.Xr ober_get_string 3 , 83.Xr ober_read_elements 3 , 84.Xr ober_set_header 3 85.Sh HISTORY 86These functions first appeared as internal functions in 87.Xr snmpd 8 88in 89.Ox 4.2 90and were moved to libutil in 91.Ox 6.6 . 92.Sh AUTHORS 93.An -nosplit 94The BER library was written by 95.An Claudio Jeker Aq Mt claudio@openbsd.org , 96.An Marc Balmer Aq Mt marc@openbsd.org 97and 98.An Reyk Floeter Aq Mt reyk@openbsd.org . 99