.\" $OpenBSD: ber.3,v 1.6 2008/03/18 16:57:58 reyk Exp $
.\"
.\" Copyright (c) 2007 Reyk Floeter <reyk@vantronix.net>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: March 18 2008 $
.Dt BER 3
.Os
.Sh NAME
.Nm ber_get_element ,
.Nm ber_set_header ,
.Nm ber_link_elements ,
.Nm ber_unlink_elements ,
.Nm ber_replace_elements ,
.Nm ber_add_sequence ,
.Nm ber_add_set ,
.Nm ber_add_integer ,
.Nm ber_get_integer ,
.Nm ber_add_boolean ,
.Nm ber_get_boolean ,
.Nm ber_add_string ,
.Nm ber_add_nstring ,
.Nm ber_add_bitstring ,
.Nm ber_get_string ,
.Nm ber_get_nstring ,
.Nm ber_get_bitstring ,
.Nm ber_add_null ,
.Nm ber_get_null ,
.Nm ber_add_eoc ,
.Nm ber_get_eoc ,
.Nm ber_add_oid ,
.Nm ber_add_oidstring ,
.Nm ber_get_oid ,
.Nm ber_oid2ber ,
.Nm ber_string2oid ,
.Nm ber_printf_elements ,
.Nm ber_scanf_elements ,
.Nm ber_get_writebuf ,
.Nm ber_write_elements ,
.Nm ber_set_readbuf ,
.Nm ber_read_elements ,
.Nm ber_free_elements ,
.Nm ber_calc_len ,
.Nm ber_set_application ,
.Nm ber_free
.Nd Parse ASN.1 with Basic Encoding Rules.
.Sh SYNOPSIS
.Fd #include <ber.h>
.Ft "struct ber_element *"
.Fn "ber_get_element" "unsigned long encoding"
.Ft "void"
.Fn "ber_set_header" "struct ber_element *elm" "int class" "unsigned long type"
.Ft "void"
.Fn "ber_link_elements" "struct ber_element *prev" "struct ber_element *elm"
.Ft "struct ber_element *"
.Fn "ber_unlink_elements" "struct ber_element *prev"
.Ft "void"
.Fn "ber_replace_elements" "struct ber_element *prev" "struct ber_element *elm"
.Ft "struct ber_element *"
.Fn "ber_add_sequence" "struct ber_element *prev"
.Ft "struct ber_element *"
.Fn "ber_add_set" "struct ber_element *prev"
.Ft "struct ber_element *"
.Fn "ber_add_integer" "struct ber_element *prev" "long long val"
.Ft "int"
.Fn "ber_get_integer" "struct ber_element *root" "long long *val"
.Ft "struct ber_element *"
.Fn "ber_add_boolean" "struct ber_element *prev" "int bool"
.Ft "int"
.Fn "ber_get_boolean" "struct ber_element *root" "int *bool"
.Ft "struct ber_element *"
.Fn "ber_add_string" "struct ber_element *prev" "const char *string"
.Ft "struct ber_element *"
.Fn "ber_add_nstring" "struct ber_element *prev" "const char *string" "size_t size"
.Ft "int"
.Fn "ber_get_string" "struct ber_element *root" "char **charbuf"
.Ft "int"
.Fn "ber_get_nstring" "struct ber_element *root" "void **buf" "size_t *size"
.Ft "struct ber_element *"
.Fn "ber_add_bitstring" "struct ber_element *prev" "const void *buf" "size_t size"
.Ft "int"
.Fn "ber_get_bitstring" "struct ber_element *root" "void **buf" "size_t *size"
.Ft "struct ber_element *"
.Fn "ber_add_null" "struct ber_element *prev"
.Ft "int"
.Fn "ber_get_null" "struct ber_element *root"
.Ft "struct ber_element *"
.Fn "ber_add_eoc" "struct ber_element *prev"
.Ft "int"
.Fn "ber_get_eoc" "struct ber_element *root"
.Ft "struct ber_element *"
.Fn "ber_add_oid" "struct ber_element *prev" "struct ber_oid *oid"
.Ft "struct ber_element *"
.Fn "ber_add_oidstring" "struct ber_element *prev" "const char *string"
.Ft "int"
.Fn "ber_get_oid" "struct ber_element *root" "struct ber_oid *oid"
.Ft "size_t"
.Fn "ber_oid2ber" "struct ber_oid *oid" "u_int8_t *buf" "size_t size"
.Ft "int"
.Fn "ber_string2oid" "const char *string" "struct ber_oid *oid"
.Ft "struct ber_element *"
.Fn "ber_printf_elements" "struct ber_element *prev" "char *format" "..."
.Ft "int"
.Fn "ber_scanf_elements" "struct ber_element *root" "char *format" "..."
.Ft "ssize_t"
.Fn "ber_get_writebuf" "struct ber *ber" "void **buf"
.Ft "int"
.Fn "ber_write_elements" "struct ber *ber" "struct ber_element *root"
.Ft "void"
.Fn "ber_set_readbuf" "struct ber *ber" "void *buf" "size_t len"
.Ft "struct"
.Fn "ber_element *ber_read_elements" "struct ber *ber" "struct ber_element *root"
.Ft "void"
.Fn "ber_free_elements" "struct ber_element *root"
.Ft "size_t"
.Fn "ber_calc_len" "struct ber_element *root"
.Ft "void"
.Fn "ber_set_application" "struct ber *ber" "unsigned long (*cb)(struct ber_element *)"
.Ft "void"
.Fn "ber_free" "struct ber *ber"
.Sh DESCRIPTION
The
.Nm ber
API provides a mechanism to read and write ASN.1 streams and buffers
using the
.Ic Basic Encoding Rules .
.Sh BER ELEMENTS
.Fn ber_get_element ,
.Fn ber_set_header ,
.Fn ber_link_elements ,
.Fn ber_unlink_elements ,
.Fn ber_replace_elements ,
.Fn ber_calc_len
.Pp

.Sh BER TYPES
.Fn ber_add_sequence ,
.Fn ber_add_set ,
.Fn ber_add_integer ,
.Fn ber_get_integer ,
.Fn ber_add_boolean ,
.Fn ber_get_boolean ,
.Fn ber_add_string ,
.Fn ber_add_nstring ,
.Fn ber_add_bitstring ,
.Fn ber_get_string ,
.Fn ber_get_nstring ,
.Fn ber_get_bitstring ,
.Fn ber_add_null ,
.Fn ber_get_null ,
.Fn ber_add_eoc ,
.Fn ber_get_eoc

.Sh OBJECT IDS
Object Identifiers are commonly used in ASN.1-based protocols.
These functions provide an interface to parse OIDs.
For internal representation of OIDs, the following structure
.Ft struct ber_oid
is being used:
.Bd -literal
#define BER_MIN_OID_LEN		2
#define BER_MAX_OID_LEN		128

struct ber_oid {
	u_int32_t	bo_id[BER_MAX_OID_LEN + 1];
	size_t		bo_n;
};
.Ed
.Pp
.Fn ber_add_oid ,
.Fn ber_add_oidstring ,
.Fn ber_get_oid ,
.Fn ber_oid2ber ,
.Fn ber_string2oid
.Pp

.Sh FORMAT STRINGS
.Fn ber_printf_elements ,
.Fn ber_scanf_elements
.Pp

.Sh I/O OPERATIONS
.Fn ber_get_writebuf ,
.Fn ber_write_elements ,
.Fn ber_set_readbuf ,
.Fn ber_read_elements ,
.Fn ber_free_elements ,
.Fn ber_set_application ,
.Fn ber_free
.Pp

.Sh RETURN VALUES
Upon successful completion
.Fn ber_get_integer ,
.Fn ber_get_boolean ,
.Fn ber_get_string ,
.Fn ber_get_nstring ,
.Fn ber_get_bitstring ,
.Fn ber_get_null ,
.Fn ber_get_eoc ,
.Fn ber_get_oid ,
.Fn ber_string2oid ,
.Fn ber_scanf_elements ,
and
.Fn ber_write_elements
return 0.
Otherwise, \-1 is returned and the global variable errno is
set to indicate the error.
.Sh SEE ALSO
.Xr socket 2
.Sh HISTORY
The
.Nm ber
manpage first appeared in
.Ox 4.3 .
.Sh AUTHORS
The
.Nm ber
library was written by 
.An Claudio Jeker Aq claudio@openbsd.org ,
.An Marc Balmer Aq marc@openbsd.org
and
.An Reyk Floeter Aq reyk@openbsd.org .
.Sh BUGS
The code is buggy and incomplete.
This manpage is a stub.