404 lines
10 KiB
Groff
404 lines
10 KiB
Groff
.\" Copyright (c) 2003 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: sdp.3,v 1.1 2003/09/07 20:34:19 max Exp $
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.\" $FreeBSD$
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.\"
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.Dd September 7, 2003
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.Dt SDP 3
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.Os
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.Sh NAME
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.Nm SDP_GET8 ,
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.Nm SDP_GET16 ,
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.Nm SDP_GET32 ,
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.Nm SDP_GET64 ,
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.Nm SDP_GET128 ,
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.Nm SDP_PUT8 ,
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.Nm SDP_PUT16 ,
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.Nm SDP_PUT32 ,
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.Nm SDP_PUT64 ,
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.Nm SDP_PUT128 ,
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.Nm sdp_open ,
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.Nm sdp_open_local ,
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.Nm sdp_close ,
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.Nm sdp_error ,
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.Nm sdp_search ,
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.Nm sdp_attr2desc ,
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.Nm sdp_uuid2desc
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.Nd Bluetooth SDP routines
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.Sh LIBRARY
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.Lb libsdp
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.Sh SYNOPSIS
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.In bluetooth.h
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.In sdp.h
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.Fn SDP_GET8 "b" "cp"
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.Fn SDP_GET16 "s" "cp"
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.Fn SDP_GET32 "l" "cp"
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.Fn SDP_GET64 "l" "cp"
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.Fn SDP_GET128 "l" "cp"
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.Fn SDP_PUT8 "b" "cp"
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.Fn SDP_PUT16 "s" "cp"
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.Fn SDP_PUT32 "l" "cp"
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.Fn SDP_PUT64 "l" "cp"
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.Fn SDP_PUT128 "l" "cp"
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.Ft "void *"
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.Fn sdp_open "bdaddr_t const *l" "bdaddr_t const *r"
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.Ft "void *"
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.Fn sdp_open_local "char const *control"
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.Ft int32_t
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.Fn sdp_close "void *xs"
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.Ft int32_t
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.Fn sdp_error "void *xs"
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.Ft int32_t
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.Fo sdp_search
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.Fa "void *xs" "uint32_t plen" "uint16_t const *pp" "uint32_t alen"
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.Fa "uint32_t const *ap" "uint32_t vlen" "sdp_attr_t *vp"
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.Fc
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.Ft "char const * const"
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.Fn sdp_attr2desc "uint16_t attr"
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.Ft "char const * const"
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.Fn sdp_uuid2desc "uint16_t uuid"
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.Ft int32_t
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.Fo sdp_register_service
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.Fa "void *xss" "uint16_t uuid" "bdaddr_p const bdaddr" "uint8_t const *data"
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.Fa "uint32_t datalen" "uint32_t *handle"
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.Fc
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.Ft int32_t
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.Fn sdp_unregister_service "void *xss" "uint32_t handle"
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.Ft int32_t
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.Fo sdp_change_service
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.Fa "void *xss" "uint32_t handle" "uint8_t const *data" "uint32_t datalen"
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.Fc
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.Sh DESCRIPTION
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The
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.Fn SDP_GET8 ,
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.Fn SDP_GET16 ,
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.Fn SDP_GET32 ,
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.Fn SDP_GET64
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and
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.Fn SDP_GET128
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macros are used to get byte, short, long, long long and 128-bit integer
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from the buffer pointed by
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.Fa cp
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pointer.
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The pointer is automatically advanced.
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.Pp
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The
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.Fn SDP_PUT8 ,
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.Fn SDP_PUT16 ,
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.Fn SDP_PUT32 ,
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.Fn SDP_PUT64
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and
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.Fn SDP_PUT128
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macros are used to put byte, short, long, long long and 128-bit integer
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into the buffer pointed by
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.Fa cp
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pointer.
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The pointer is automatically advanced.
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.Pp
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The
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.Fn sdp_open
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and
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.Fn sdp_open_local
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functions each return a pointer to an opaque object describing SDP session.
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The
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.Fa l
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argument passed to
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.Fn sdp_open
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function should point to a source BD_ADDR.
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If source BD_ADDR is
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.Dv NULL
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then source address
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.Dv NG_HCI_BDADDR_ANY
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is used.
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The
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.Fa r
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argument passed to
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.Fn sdp_open
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function should point to a
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.Pf non- Dv NULL
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remote BD_ADDR.
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Remote BD_ADDR cannot be
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.Dv NG_HCI_BDADDR_ANY .
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The
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.Fn sdp_open_local
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function takes path to the control socket and opens a connection to a local
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SDP server.
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If path to the control socket is
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.Dv NULL
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then default
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.Pa /var/run/sdp
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path will be used.
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.Pp
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The
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.Fn sdp_close
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function terminates active SDP session and deletes SDP session object.
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The
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.Fa xs
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parameter should point to a valid SDP session object created with
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.Fn sdp_open
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or
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.Fn sdp_open_local .
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.Pp
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The
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.Fn sdp_error
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function returns last error that is stored inside SDP session object.
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The
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.Fa xs
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parameter should point to a valid SDP session object created with
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.Fn sdp_open
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or
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.Fn sdp_open_local .
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The error value returned can be converted to a human readable message by
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calling
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.Xr strerror 3
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function.
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.Pp
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The
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.Fn sdp_search
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function is used to perform SDP Service Search Attribute Request.
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The
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.Fa xs
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parameter should point to a valid SDP session object created with
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.Fn sdp_open
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or
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.Fn sdp_open_local .
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The
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.Fa pp
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parameter is a Service Search Pattern - an array of one or more Service
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Class IDs.
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The maximum number of Service Class IDs in the array is 12.
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The
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.Fa plen
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parameter is the length of the Service Search pattern.
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The
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.Fa ap
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parameter is an Attribute ID Range List - an array of one or more SDP Attribute
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ID Range.
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Each attribute ID Range is encoded as a 32-bit unsigned integer data
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element, where the high order 16 bits are interpreted as the beginning
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attribute ID of the range and the low order 16 bits are interpreted as the
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ending attribute ID of the range.
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The attribute IDs contained in the Attribute ID Ranges List must be listed in
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ascending order without duplication of any attribute ID values.
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Note that all attributes may be requested by specifying a range of
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0x0000-0xFFFF.
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The
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.Fa alen
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parameter is the length of the Attribute ID Ranges List.
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The
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.Fn SDP_ATTR_RANGE "lo" "hi"
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macro can be used to prepare Attribute ID Range.
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The
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.Fa vp
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parameter should be an array of
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.Vt sdp_attr_t
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structures.
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Each
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.Vt sdp_attr_t
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structure describes single SDP attribute and defined as follows:
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.Bd -literal -offset indent
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struct sdp_attr {
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uint16_t flags;
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#define SDP_ATTR_OK (0 << 0)
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#define SDP_ATTR_INVALID (1 << 0)
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#define SDP_ATTR_TRUNCATED (1 << 1)
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uint16_t attr; /* SDP_ATTR_xxx */
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uint32_t vlen; /* length of the value[] in bytes */
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uint8_t *value; /* base pointer */
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};
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typedef struct sdp_attr sdp_attr_t;
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typedef struct sdp_attr * sdp_attr_p;
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.Ed
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.Pp
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The caller of the
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.Fn sdp_search
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function is expected to prepare the array of
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.Vt sdp_attr
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structures and for each element of the array both
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.Va vlen
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and
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.Va value
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must be set.
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The
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.Fn sdp_search
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function will fill each
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.Vt sdp_attr_t
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structure with attribute and value, i.e., it will set
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.Va flags ,
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.Va attr
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and
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.Va vlen
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fields.
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The actual value of the attribute will be copied into
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.Va value
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buffer.
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Note: attributes are returned in the order they appear in the Service Search
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Attribute Response.
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SDP server could return several attributes for the same record.
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In this case the order of the attributes will be: all attributes for the first
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records, then all attributes for the secord record etc.
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.Pp
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The
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.Fn sdp_attr2desc
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and
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.Fn sdp_uuid2desc
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functions each take a numeric attribute ID/UUID value and convert it to a
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human readable description.
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.Pp
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The
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.Fn sdp_register_service
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function
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is used to register service with the local SDP server.
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The
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.Fa xss
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parameter should point to a valid SDP session object obtained from
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.Fn sdp_open_local .
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The
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.Fa uuid
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parameter is a SDP Service Class ID for the service to be registered.
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The
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.Fa bdaddr
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parameter should point to a valid BD_ADDR.
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The service will be only advertised if request was received by the local device
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with
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.Fa bdaddr .
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If
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.Fa bdaddr
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is set to
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.Dv NG_HCI_BDADDR_ANY
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then the service will be advertised to any remote devices that queries for it.
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The
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.Fa data
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and
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.Fa datalen
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parameters specify data and size of the data for the service.
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Upon successful return
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.Fn sdp_register_service
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will populate
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.Fa handle
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with the SDP record handle.
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This parameter is optional and can be set to
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.Dv NULL .
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.Pp
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The
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.Fn sdp_unregister_service
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function
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is used to unregister service with the local SDP server.
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The
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.Fa xss
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parameter should point to a valid SDP session object obtained from
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.Fn sdp_open_local .
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The
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.Fa handle
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parameter should contain a valid SDP record handle of the service to be
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unregistered.
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.Pp
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The
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.Fn sdp_change_service
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function is used to change data associated with the existing service on
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the local SDP server.
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The
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.Fa xss
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parameter should point to a valid SDP session object obtained from
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.Fn sdp_open_local .
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The
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.Fa handle
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parameter should contain a valid SDP record handle of the service to be changed.
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The
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.Fa data
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and
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.Fa datalen
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parameters specify data and size of the data for the service.
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.Sh CAVEAT
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When registering services with the local SDP server the application must
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keep the SDP session open.
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If SDP session is closed then the local SDP server will remove all services
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that were registered over the session.
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The application is allowed to change or unregister service if it was registered
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over the same session.
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.Sh EXAMPLES
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The following example shows how to get
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.Dv SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST
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attribute for the
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.Dv SDP_SERVICE_CLASS_SERIAL_PORT
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service from the remote device.
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.Bd -literal -offset indent
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bdaddr_t remote;
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uint8_t buffer[1024];
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void *ss = NULL;
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uint16_t serv = SDP_SERVICE_CLASS_SERIAL_PORT;
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uint32_t attr = SDP_ATTR_RANGE(
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SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST,
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SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
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sdp_attr_t proto = { SDP_ATTR_INVALID,0,sizeof(buffer),buffer };
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/* Obtain/set remote BDADDR here */
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if ((ss = sdp_open(NG_HCI_BDADDR_ANY, remote)) == NULL)
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/* exit ENOMEM */
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if (sdp_error(ss) != 0)
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/* exit spd_error(ss) */
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if (sdp_search(ss, 1, &serv, 1, &attr, 1, &proto) != 0)
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/* exit sdp_error(ss) */
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if (proto.flags != SDP_ATTR_OK)
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/* exit see proto.flags for details */
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/* If we got here then we have attribute value in proto.value */
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.Ed
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.Sh DIAGNOSTICS
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Both
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.Fn sdp_open
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and
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.Fn sdp_open_local
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will return
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.Dv NULL
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if memory allocation for the new SDP session object fails.
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If the new SDP object was created then caller is still expected to call
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.Fn sdp_error
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to check if there was connection error.
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.Pp
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The
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.Fn sdp_search ,
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.Fn sdp_register_service ,
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.Fn sdp_unregister_service
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and
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.Fn sdp_change_service
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functions return non-zero value on error.
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The caller is expected to call
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.Fn sdp_error
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to find out more about error.
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.Sh SEE ALSO
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.Xr bluetooth 3 ,
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.Xr strerror 3 ,
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.Xr sdpcontrol 8 ,
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.Xr sdpd 8
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.Sh BUGS
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Most likely.
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Please report bugs if found.
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.Sh AUTHORS
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.An Maksim Yevmenkin Aq m_evmenkin@yahoo.com
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