728 lines
17 KiB
Groff
728 lines
17 KiB
Groff
.\" Copyright (c) 2003-2009 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: bluetooth.3,v 1.5 2003/05/20 23:04:30 max Exp $
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.\" $FreeBSD$
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.\"
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.Dd April 9, 2009
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.Dt BLUETOOTH 3
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.Os
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.Sh NAME
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.Nm bt_gethostbyname ,
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.Nm bt_gethostbyaddr ,
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.Nm bt_gethostent ,
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.Nm bt_sethostent ,
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.Nm bt_endhostent ,
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.Nm bt_getprotobyname ,
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.Nm bt_getprotobynumber ,
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.Nm bt_getprotoent ,
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.Nm bt_setprotoent ,
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.Nm bt_endprotoent ,
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.Nm bt_aton ,
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.Nm bt_ntoa ,
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.Nm bt_devaddr ,
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.Nm bt_devname ,
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.Nm bt_devinfo ,
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.Nm bt_devenum ,
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.Nm bt_devopen ,
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.Nm bt_devclose ,
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.Nm bt_devsend ,
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.Nm bt_devrecv ,
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.Nm bt_devreq ,
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.Nm bt_devfilter ,
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.Nm bt_devfilter_pkt_set ,
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.Nm bt_devfilter_pkt_clr ,
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.Nm bt_devfilter_pkt_tst ,
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.Nm bt_devfilter_evt_set ,
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.Nm bt_devfilter_evt_clr ,
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.Nm bt_devfilter_evt_tst ,
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.Nm bt_devinquiry ,
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.Nm bdaddr_same ,
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.Nm bdaddr_any ,
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.Nm bdaddr_copy
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.Nd Bluetooth routines
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.Sh LIBRARY
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.Lb libbluetooth
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.Sh SYNOPSIS
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.In bluetooth.h
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.Ft struct hostent *
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.Fn bt_gethostbyname "const char *name"
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.Ft struct hostent *
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.Fn bt_gethostbyaddr "const char *addr" "int len" "int type"
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.Ft struct hostent *
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.Fn bt_gethostent void
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.Ft void
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.Fn bt_sethostent "int stayopen"
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.Ft void
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.Fn bt_endhostent void
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.Ft struct protoent *
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.Fn bt_getprotobyname "const char *name"
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.Ft struct protoent *
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.Fn bt_getprotobynumber "int proto"
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.Ft struct protoent *
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.Fn bt_getprotoent void
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.Ft void
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.Fn bt_setprotoent "int stayopen"
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.Ft void
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.Fn bt_endprotoent void
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.Ft int
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.Fn bt_aton "const char *str" "bdaddr_t *ba"
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.Ft const char *
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.Fn bt_ntoa "const bdaddr_t *ba" "char *str"
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.Ft int
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.Fn bt_devaddr "const char *devname" "bdaddr_t *addr"
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.Ft int
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.Fn bt_devname "char *devname" "const bdaddr_t *addr"
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.Ft int
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.Fn (bt_devenum_cb_t) "int s" "struct bt_devinfo const *di" "void *arg"
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.Ft int
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.Fn bt_devinfo "struct bt_devinfo *di"
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.Ft int
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.Fn bt_devenum "bt_devenum_cb_t *cb" "void *arg"
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.Ft int
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.Fn bt_devopen "char const *devname"
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.Ft int
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.Fn bt_devclose "int s"
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.Ft int
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.Fn bt_devsend "int s" "uint16_t opcode" "void *param" "size_t plen"
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.Ft ssize_t
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.Fn bt_devrecv "int s" "void *buf" "size_t size" "time_t to"
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.Ft int
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.Fn bt_devreq "int s" "struct bt_devreq *r" "time_t to"
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.Ft int
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.Fn bt_devfilter "int s" "struct bt_devfilter const *new" "struct bt_devfilter *old"
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.Ft void
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.Fn bt_devfilter_pkt_set "struct bt_devfilter *filter" "uint8_t type"
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.Ft void
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.Fn bt_devfilter_pkt_clt "struct bt_devfilter *filter" "uint8_t type"
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.Ft int
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.Fn bt_devfilter_pkt_tst "struct bt_devfilter const *filter" "uint8_t type"
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.Ft void
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.Fn bt_devfilter_evt_set "struct bt_devfilter *filter" "uint8_t event"
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.Ft void
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.Fn bt_devfilter_evt_clt "struct bt_devfilter *filter" "uint8_t event"
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.Ft int
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.Fn bt_devfilter_evt_tst "struct bt_devfilter const *filter" "uint8_t event"
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.Ft int
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.Fn bt_devinquiry "char const *devname" "time_t length" "int num_rsp" "struct bt_devinquiry **ii"
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.Ft int
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.Fn bdaddr_same "const bdaddr_t *a" "const bdaddr_t *b"
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.Ft int
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.Fn bdaddr_any "const bdaddr_t *a"
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.Ft int
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.Fn bdaddr_copy "const bdaddr_t *dst" "const bdaddr_t *src"
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.Sh DESCRIPTION
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The
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.Fn bt_gethostent ,
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.Fn bt_gethostbyname
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and
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.Fn bt_gethostbyaddr
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functions
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each return a pointer to an object with the
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.Vt hostent
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structure describing a Bluetooth host
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referenced by name or by address, respectively.
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.Pp
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The
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.Fa name
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argument passed to
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.Fn bt_gethostbyname
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should point to a
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.Dv NUL Ns -terminated
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hostname.
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The
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.Fa addr
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argument passed to
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.Fn bt_gethostbyaddr
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should point to an address which is
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.Fa len
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bytes long,
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in binary form
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(i.e., not a Bluetooth BD_ADDR in human readable
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.Tn ASCII
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form).
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The
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.Fa type
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argument specifies the address family of this address and must be set to
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.Dv AF_BLUETOOTH .
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.Pp
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The structure returned contains the information obtained from a line in
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.Pa /etc/bluetooth/hosts
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file.
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.Pp
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The
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.Fn bt_sethostent
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function controls whether
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.Pa /etc/bluetooth/hosts
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file should stay open after each call to
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.Fn bt_gethostbyname
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or
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.Fn bt_gethostbyaddr .
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If the
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.Fa stayopen
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flag is non-zero, the file will not be closed.
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.Pp
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The
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.Fn bt_endhostent
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function closes the
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.Pa /etc/bluetooth/hosts
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file.
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.Pp
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The
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.Fn bt_getprotoent ,
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.Fn bt_getprotobyname
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and
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.Fn bt_getprotobynumber
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functions each return a pointer to an object with the
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.Vt protoent
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structure describing a Bluetooth Protocol Service Multiplexor referenced
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by name or number, respectively.
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.Pp
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The
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.Fa name
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argument passed to
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.Fn bt_getprotobyname
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should point to a
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.Dv NUL Ns -terminated
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Bluetooth Protocol Service Multiplexor name.
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The
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.Fa proto
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argument passed to
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.Fn bt_getprotobynumber
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should have numeric value of the desired Bluetooth Protocol Service Multiplexor.
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.Pp
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The structure returned contains the information obtained from a line in
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.Pa /etc/bluetooth/protocols
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file.
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.Pp
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The
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.Fn bt_setprotoent
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function controls whether
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.Pa /etc/bluetooth/protocols
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file should stay open after each call to
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.Fn bt_getprotobyname
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or
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.Fn bt_getprotobynumber .
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If the
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.Fa stayopen
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flag is non-zero, the file will not be closed.
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.Pp
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The
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.Fn bt_endprotoent
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function closes the
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.Pa /etc/bluetooth/protocols
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file.
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.Pp
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The
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.Fn bt_aton
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routine interprets the specified character string as a Bluetooth address,
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placing the address into the structure provided.
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It returns 1 if the string was successfully interpreted,
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or 0 if the string is invalid.
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.Pp
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The routine
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.Fn bt_ntoa
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takes a Bluetooth address and places an
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.Tn ASCII
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string representing the address into the buffer provided.
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It is up to the caller to ensure that provided buffer has enough space.
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If no buffer was provided then internal static buffer will be used.
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.Pp
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The
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.Fn bt_devaddr
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function interprets the specified
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.Fa devname
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string as the address or device name of a Bluetooth device on the local system,
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and places the device address in the provided
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.Fa bdaddr ,
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if any.
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The function returns 1 if the string was successfully interpreted,
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or 0 if the string did not match any local device.
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The
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.Fn bt_devname
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function takes a Bluetooth device address and copies the local device
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name associated with that address into the buffer provided,
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if any.
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Caller must ensure that provided buffer is at least
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.Dv HCI_DEVNAME_SIZE
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characters in size.
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The function returns 1 when the device was found,
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otherwise 0.
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.Pp
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The
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.Fn bt_devinfo
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function populates provided
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.Vt bt_devinfo
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structure with the information about given Bluetooth device.
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The caller is expected to pass Bluetooth device name in the
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.Fa devname
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field of the passed
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.Vt bt_devinfo
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structure.
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The function returns 0 when successful,
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otherwise -1.
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The
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.Vt bt_devinfo
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structure is defined as follows
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.Bd -literal -offset indent
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struct bt_devinfo
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{
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char devname[HCI_DEVNAME_SIZE];
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uint32_t state;
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bdaddr_t bdaddr;
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uint16_t _reserved0;
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uint8_t features[HCI_DEVFEATURES_SIZE];
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/* buffer info */
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uint16_t _reserved1;
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uint16_t cmd_free;
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uint16_t sco_size;
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uint16_t sco_pkts;
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uint16_t sco_free;
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uint16_t acl_size;
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uint16_t acl_pkts;
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uint16_t acl_free;
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/* stats */
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uint32_t cmd_sent;
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uint32_t evnt_recv;
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uint32_t acl_recv;
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uint32_t acl_sent;
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uint32_t sco_recv;
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uint32_t sco_sent;
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uint32_t bytes_recv;
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uint32_t bytes_sent;
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/* misc/specific */
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uint16_t link_policy_info;
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uint16_t packet_type_info;
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uint16_t role_switch_info;
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uint16_t debug;
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uint8_t _padding[20];
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};
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.Ed
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.Pp
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The
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.Fn bt_devenum
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function enumerates Bluetooth devices present in the system.
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For every device found,
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the function will call provided
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.Fa cb
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callback function which should be of
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.Vt bt_devenum_cb_t
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type.
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The callback function is passed a
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.Dv HCI
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socket
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.Fa s ,
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fully populated
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.Vt bt_devinfo
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structure
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.Fa di
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and
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.Fa arg
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argument provided to the
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.Fn bt_devenum .
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The callback function can stop enumeration by returning a value
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that is greater than zero.
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The function returns number of successfully enumerated devices,
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or -1 if an error occurred.
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.Pp
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The
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.Fn bt_devopen
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function opens a Bluetooth device with the given
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.Fa devname
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and returns a connected and bound
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.Dv HCI
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socket handle.
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The function returns -1 if an error has occurred.
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.Pp
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The
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.Fn bt_devclose
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closes the passed
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.Dv HCI
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socket handle
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.Fa s ,
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previously obtained with
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.Xr bt_devopen 3 .
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.Pp
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The
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.Fn bt_devsend
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function sends a Bluetooth
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.Dv HCI
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command with the given
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.Fa opcode
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to the provided socket
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.Fa s ,
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previously obtained with
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.Xr bt_devopen 3 .
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The
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.Fa opcode
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parameter is expected to be in the host byte order.
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The
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.Fa param
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and
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.Fa plen
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parameters specify command parameters.
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The
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.Fn bt_devsend
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function does not modify the
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.Dv HCI
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filter on the provided socket
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.Fa s .
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The function returns 0 on success,
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or -1 if an error occurred.
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.Pp
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The
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.Fn bt_devrecv
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function receives one Bluetooth
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.Dv HCI
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packet from the socket
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.Fa s ,
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previously obtained with
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.Xr bt_devopen 3 .
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The packet is placed into the provided buffer
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.Fa buf
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of size
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.Fa size .
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The
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.Fa to
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parameter specifies receive timeout in seconds.
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Infinite timeout can be specified by passing negative value in the
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.Fa to
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parameter.
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The
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.Fn bt_devrecv
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function does not modify the
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.Dv HCI
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filter on the provided socket
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.Fa s .
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The function returns total number of bytes received,
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or -1 if an error occurred.
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.Pp
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The
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.Fn bt_devreq
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function makes a Bluetooth
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.Dv HCI
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request to the socket
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.Fa s ,
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previously obtained with
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.Xr bt_devopen 3 .
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The function will send the specified command and will wait for the specified
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event,
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or timeout
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.Fa to
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seconds to occur.
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The
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.Vt bt_devreq
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structure is defined as follows
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.Bd -literal -offset indent
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struct bt_devreq
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{
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uint16_t opcode;
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uint8_t event;
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void *cparam;
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size_t clen;
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void *rparam;
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size_t rlen;
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};
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.Ed
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.Pp
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The
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.Fa opcode
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field specifies the command and is expected to be in the host byte order.
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The
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.Fa cparam
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and
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.Fa clen
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fields specify command parameters data and command parameters data size
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respectively.
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The
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.Fa event
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field specifies which Bluetooth
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.Dv HCI
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event ID the function should wait for, otherwise it should be set to zero.
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The
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.Dv HCI
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Command Complete and Command Status events are enabled by default.
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The
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.Fa rparam
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and
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.Fa rlen
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parameters specify buffer and buffer size respectively where return
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parameters should be placed.
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The
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.Fn bt_devreq
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function temporarily modifies filter on the provided
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.Dv HCI
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socket
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.Fa s .
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The function returns 0 on success, or -1 if an error occurred.
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.Pp
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The
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.Fn bt_devfilter
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controls the local
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.Dv HCI
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filter associated with the socket
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.Fa s ,
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previously obtained with
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.Xr bt_devopen 3 .
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Filtering can be done on packet types, i.e.
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.Dv ACL ,
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.Dv SCO
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or
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.Dv HCI ,
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command and event packets, and, in addition, on
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.Dv HCI
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event IDs.
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Before applying the
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.Fa new
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filter (if provided) the function will try to obtain the current filter
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from the socket
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.Fa s
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and place it into the
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.Fa old
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parameter (if provided).
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The function returns 0 on success, or -1 if an error occurred.
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.Pp
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The
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.Fn bt_devfilter_pkt_set ,
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.Fn bt_devfilter_pkt_clr
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and
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.Fn bt_devfilter_pkt_tst
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functions can be used to modify and test the
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.Dv HCI
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filter
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.Fa filter .
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The
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.Fa type
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parameter specifies
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.Dv HCI
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packet type.
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.Pp
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The
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.Fn bt_devfilter_evt_set ,
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.Fn bt_devfilter_evt_clr
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and
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.Fn bt_devfilter_evt_tst
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functions can be used to modify and test the
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.Dv HCI
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event filter
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.Fa filter .
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The
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.Fa event
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parameter specifies
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.Dv HCI
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event ID.
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.Pp
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The
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.Fn bt_devinquiry
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function performs Bluetooth inquiry.
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The
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.Fa devname
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parameter specifies which local Bluetooth device should perform an inquiry.
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If not specified, i.e.
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.Dv NULL ,
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|
then first available device will be used.
|
|
The
|
|
.Fa length
|
|
parameters specifies the total length of an inquiry in seconds.
|
|
If not specified, i.e. 0, default value will be used.
|
|
The
|
|
.Fa num_rsp
|
|
parameter specifies the number of responses that can be received before
|
|
the inquiry is halted.
|
|
If not specified, i.e. 0, default value will be used.
|
|
The
|
|
.Fa ii
|
|
parameter specifies where to place inquiry results.
|
|
On success, the function will return total number of inquiry results,
|
|
will allocate,
|
|
using
|
|
.Xr calloc 3 ,
|
|
buffer to store all the inquiry results and
|
|
will return pointer to the allocated buffer in the
|
|
.Fa ii
|
|
parameter.
|
|
It is up to the caller of the function to dispose of the buffer using
|
|
.Xr free 3
|
|
call.
|
|
The function returns -1 if an error has occurred.
|
|
The
|
|
.Vt bt_devinquiry
|
|
structure is defined as follows
|
|
.Bd -literal -offset indent
|
|
struct bt_devinquiry {
|
|
bdaddr_t bdaddr;
|
|
uint8_t pscan_rep_mode;
|
|
uint8_t pscan_period_mode;
|
|
uint8_t dev_class[3];
|
|
uint16_t clock_offset;
|
|
int8_t rssi;
|
|
uint8_t data[240];
|
|
};
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Fn bdaddr_same ,
|
|
.Fn bdaddr_any
|
|
and
|
|
.Fn bdaddr_copy
|
|
are handy shorthand Bluetooth address utility functions.
|
|
The
|
|
.Fn bdaddr_same
|
|
function will test if two provided BD_ADDRs are the same.
|
|
The
|
|
.Fn bdaddr_any
|
|
function will test if provided BD_ADDR is
|
|
.Dv ANY
|
|
BD_ADDR.
|
|
The
|
|
.Fn bdaddr_copy
|
|
function will copy provided
|
|
.Fa src
|
|
BD_ADDR into provided
|
|
.Fa dst
|
|
BD_ADDR.
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /etc/bluetooth/hosts" -compact
|
|
.It Pa /etc/bluetooth/hosts
|
|
.It Pa /etc/bluetooth/protocols
|
|
.El
|
|
.Sh EXAMPLES
|
|
Print out the hostname associated with a specific BD_ADDR:
|
|
.Bd -literal -offset indent
|
|
const char *bdstr = "00:01:02:03:04:05";
|
|
bdaddr_t bd;
|
|
struct hostent *hp;
|
|
|
|
if (!bt_aton(bdstr, &bd))
|
|
errx(1, "can't parse BD_ADDR %s", bdstr);
|
|
|
|
if ((hp = bt_gethostbyaddr((const char *)&bd,
|
|
sizeof(bd), AF_BLUETOOTH)) == NULL)
|
|
errx(1, "no name associated with %s", bdstr);
|
|
|
|
printf("name associated with %s is %s\en", bdstr, hp->h_name);
|
|
.Ed
|
|
.Sh DIAGNOSTICS
|
|
Error return status from
|
|
.Fn bt_gethostent ,
|
|
.Fn bt_gethostbyname
|
|
and
|
|
.Fn bt_gethostbyaddr
|
|
is indicated by return of a
|
|
.Dv NULL
|
|
pointer.
|
|
The external integer
|
|
.Va h_errno
|
|
may then be checked to see whether this is a temporary failure
|
|
or an invalid or unknown host.
|
|
The routine
|
|
.Xr herror 3
|
|
can be used to print an error message describing the failure.
|
|
If its argument
|
|
.Fa string
|
|
is
|
|
.Pf non- Dv NULL ,
|
|
it is printed, followed by a colon and a space.
|
|
The error message is printed with a trailing newline.
|
|
.Pp
|
|
The variable
|
|
.Va h_errno
|
|
can have the following values:
|
|
.Bl -tag -width ".Dv HOST_NOT_FOUND"
|
|
.It Dv HOST_NOT_FOUND
|
|
No such host is known.
|
|
.It Dv NO_RECOVERY
|
|
Some unexpected server failure was encountered.
|
|
This is a non-recoverable error.
|
|
.El
|
|
.Pp
|
|
The
|
|
.Fn bt_getprotoent ,
|
|
.Fn bt_getprotobyname
|
|
and
|
|
.Fn bt_getprotobynumber
|
|
return
|
|
.Dv NULL
|
|
on EOF or error.
|
|
.Sh SEE ALSO
|
|
.Xr gethostbyaddr 3 ,
|
|
.Xr gethostbyname 3 ,
|
|
.Xr getprotobyname 3 ,
|
|
.Xr getprotobynumber 3 ,
|
|
.Xr herror 3 ,
|
|
.Xr inet_aton 3 ,
|
|
.Xr inet_ntoa 3 ,
|
|
.Xr ng_hci 4
|
|
.Sh CAVEAT
|
|
The
|
|
.Fn bt_gethostent
|
|
function reads the next line of
|
|
.Pa /etc/bluetooth/hosts ,
|
|
opening the file if necessary.
|
|
.Pp
|
|
The
|
|
.Fn bt_sethostent
|
|
function opens and/or rewinds the
|
|
.Pa /etc/bluetooth/hosts
|
|
file.
|
|
.Pp
|
|
The
|
|
.Fn bt_getprotoent
|
|
function reads the next line of
|
|
.Pa /etc/bluetooth/protocols ,
|
|
opening the file if necessary.
|
|
.Pp
|
|
The
|
|
.Fn bt_setprotoent
|
|
function opens and/or rewinds the
|
|
.Pa /etc/bluetooth/protocols
|
|
file.
|
|
.Pp
|
|
The
|
|
.Fn bt_devenum
|
|
function enumerates up to
|
|
.Dv HCI_DEVMAX
|
|
Bluetooth devices.
|
|
During enumeration the
|
|
.Fn bt_devenum
|
|
function uses the same
|
|
.Dv HCI
|
|
socket.
|
|
The function guarantees that the socket,
|
|
passed to the callback function,
|
|
will be bound and connected to the Bluetooth device being enumerated.
|
|
.Sh AUTHORS
|
|
.An Maksim Yevmenkin Aq Mt m_evmenkin@yahoo.com
|
|
.Sh BUGS
|
|
Some of those functions use static data storage;
|
|
if the data is needed for future use, it should be
|
|
copied before any subsequent calls overwrite it.
|