301 lines
7.3 KiB
Groff
301 lines
7.3 KiB
Groff
.\" $NetBSD: bluetooth.3,v 1.9 2017/07/03 21:32:49 wiz Exp $
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.\"
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.\" 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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.\" $FreeBSD: src/lib/libbluetooth/bluetooth.3,v 1.7 2005/01/21 10:26:11 ru Exp $
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.\"
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.Dd October 25, 2011
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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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.Nd Bluetooth host lookup 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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.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 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 Multiplexer 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 Multiplexer 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
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Multiplexer.
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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 an internal static buffer will be used.
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.Sh FILES
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.Bl -tag -width ".Pa /etc/bluetooth/hosts" -compact
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.It Pa /etc/bluetooth/hosts
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.It Pa /etc/bluetooth/protocols
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.El
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.Sh EXAMPLES
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Print out the hostname associated with a specific BD_ADDR:
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.Bd -literal -offset indent
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const char *bdstr = "00:01:02:03:04:05";
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bdaddr_t bd;
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struct hostent *hp;
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if (!bt_aton(bdstr, &bd))
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errx(1, "can't parse BD_ADDR %s", bdstr);
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if ((hp = bt_gethostbyaddr((const char *)&bd,
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sizeof(bd), AF_BLUETOOTH)) == NULL)
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errx(1, "no name associated with %s", bdstr);
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printf("name associated with %s is %s\en", bdstr, hp->h_name);
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.Ed
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.Sh DIAGNOSTICS
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Error return status from
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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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is indicated by return of a
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.Dv NULL
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pointer.
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The external integer
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.Va h_errno
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may then be checked to see whether this is a temporary failure
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or an invalid or unknown host.
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The routine
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.Xr herror 3
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can be used to print an error message describing the failure.
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If its argument
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.Fa string
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is
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.Pf non- Dv NULL ,
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it is printed, followed by a colon and a space.
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The error message is printed with a trailing newline.
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.Pp
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The variable
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.Va h_errno
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can have the following values:
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.Bl -tag -width ".Dv HOST_NOT_FOUND"
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.It Dv HOST_NOT_FOUND
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No such host is known.
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.It Dv NO_RECOVERY
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Some unexpected server failure was encountered.
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This is a non-recoverable error.
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.El
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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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return
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.Dv NULL
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on EOF or error.
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.Sh SEE ALSO
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.Xr gethostbyaddr 3 ,
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.Xr gethostbyname 3 ,
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.Xr getprotobyname 3 ,
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.Xr getprotobynumber 3 ,
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.Xr herror 3 ,
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.Xr inet_aton 3 ,
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.Xr inet_ntoa 3
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.Sh HISTORY
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.Nm libbluetooth
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first appeared in
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.Fx
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was ported to
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.Nx 4.0
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and extended by
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.An Iain Hibbert
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for Itronix, Inc.
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.Sh AUTHORS
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.An Maksim Yevmenkin Aq Mt m_evmenkin@yahoo.com
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.An Iain Hibbert
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.Sh CAVEATS
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The
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.Fn bt_gethostent
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function reads the next line of
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.Pa /etc/bluetooth/hosts ,
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opening the file if necessary.
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.Pp
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The
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.Fn bt_sethostent
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function opens and/or rewinds 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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function reads the next line of
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.Pa /etc/bluetooth/protocols ,
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opening the file if necessary.
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.Pp
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The
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.Fn bt_setprotoent
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function opens and/or rewinds the
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.Pa /etc/bluetooth/protocols
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file.
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.Sh BUGS
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These functions use static data storage;
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if the data is needed for future use, it should be
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copied before any subsequent calls overwrite it.
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