FreeBSD-5.3/lib/libc/net/eui64.3

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.\" Copyright 2004 The Aerospace Corporation.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" Copyright (c) 1995
.\"	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
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.\" modification, are permitted provided that the following conditions
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.\" THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" $FreeBSD: src/lib/libc/net/eui64.3,v 1.3 2004/07/07 20:15:31 ru Exp $
.\"
.Dd March 4, 2004
.Dt EUI64 3
.Os
.Sh NAME
.Nm eui64 ,
.\" .Nm eui64_line ,
.Nm eui64_aton ,
.Nm eui64_ntoa ,
.Nm eui64_ntohost ,
.Nm eui64_hostton
.Nd IEEE EUI-64 conversion and lookup routines
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/types.h
.In sys/eui64.h
.\" .Ft int
.\" .Fn eui64_line "const char *l" "struct eui64 *e" "char *hostname" "size_t len"
.Ft int
.Fn eui64_aton "const char *a" "struct eui64 *e"
.Ft int
.Fn eui64_ntoa "const struct eui64 *id" "char *a" "size_t len"
.Ft int
.Fn eui64_ntohost "char *hostname" "size_t len" "const struct eui64 *id"
.Ft int
.Fn eui64_hostton "const char *hostname" "struct eui64 *id"
.Sh DESCRIPTION
These functions operate on IEEE EUI-64s using an
.Vt eui64
structure, which is defined in the header file
.In sys/eui64.h :
.Bd -literal -offset indent
/*
 * The number of bytes in an EUI-64.
 */
#define EUI64_LEN		8

/*
 * Structure of an IEEE EUI-64.
 */
struct  eui64 {
        u_char octet[EUI64_LEN];
};
.Ed
.\" .Pp
.\" The function
.\" .Fn eui64_line
.\" scans
.\" .Fa l ,
.\" an
.\" .Tn ASCII
.\" string in
.\" .Xr eui64 5
.\" format and sets
.\" .Fa e
.\" to the EUI-64 specified in the string and
.\" .Fa h
.\" to the hostname.
.\" This function is used to parse lines from
.\" .Pa /etc/eui64
.\" into their component parts.
.Pp
The
.Fn eui64_aton
function converts an
.Tn ASCII
representation of an EUI-64 into an
.Vt eui64
structure.
Likewise,
.Fn eui64_ntoa
converts an EUI-64 specified as an
.Vt eui64
structure into an
.Tn ASCII
string.
.Pp
The
.Fn eui64_ntohost
and
.Fn eui64_hostton
functions map EUI-64s to their corresponding hostnames
as specified in the
.Pa /etc/eui64
database.
The
.Fn eui64_ntohost
function
converts from EUI-64 to hostname, and
.Fn eui64_hostton
converts from hostname to EUI-64.
.Sh RETURN VALUES
.\" The
.\" .Fn eui64_line
.\" function
.\" returns zero on success and non-zero if it was unable to parse
.\" any part of the supplied line
.\" .Fa l .
.\" It returns the extracted EUI-64 in the supplied
.\" .Vt eui64
.\" structure
.\" .Fa e
.\" and the hostname in the supplied string
.\" .Fa h .
.\" .Pp
On success,
.Fn eui64_ntoa
returns a pointer to a string containing an
.Tn ASCII
representation of an EUI-64.
If it is unable to convert
the supplied
.Vt eui64
structure, it returns a
.Dv NULL
pointer.
Likewise,
.Fn eui64_aton
returns a pointer to an
.Vt eui64
structure on success and a
.Dv NULL
pointer on failure.
.Pp
The
.Fn eui64_ntohost
and
.Fn eui64_hostton
functions both return zero on success or non-zero if they were
unable to find a match in the
.Pa /etc/eui64
database.
.Sh NOTES
The user must insure that the hostname strings passed to the
.\" .Fn eui64_line ,
.Fn eui64_ntohost
and
.Fn eui64_hostton
functions are large enough to contain the returned hostnames.
.Sh NIS INTERACTION
If the
.Pa /etc/eui64
contains a line with a single
.Ql +
in it, the
.Fn eui64_ntohost
and
.Fn eui64_hostton
functions will attempt to consult the NIS
.Pa eui64.byname
and
.Pa eui64.byid
maps in addition to the data in the
.Pa /etc/eui64
file.
.Sh SEE ALSO
.Xr firewire 4 ,
.Xr eui64 5 ,
.Xr yp 8
.Sh BUGS
The
.Fn eui64_aton
and
.Fn eui64_ntoa
functions returns values that are stored in static memory areas
which may be overwritten the next time they are called.
.Sh HISTORY
These functions first appears in
.Fx 5.3 .
They are derived from the
.Xr ethers 3
family of functions.