fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
135 lines
3.9 KiB
Groff
135 lines
3.9 KiB
Groff
.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Donn Seeley at BSDI.
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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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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.\" From: @(#)linkaddr.3 8.1 (Berkeley) 7/28/93
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.\" $FreeBSD$
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.\"
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.Dd February 28, 2007
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.Dt LINK_ADDR 3
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.Os
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.Sh NAME
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.Nm link_addr ,
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.Nm link_ntoa
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.Nd elementary address specification routines for link level access
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/socket.h
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.In net/if_dl.h
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.Ft void
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.Fn link_addr "const char *addr" "struct sockaddr_dl *sdl"
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.Ft char *
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.Fn link_ntoa "const struct sockaddr_dl *sdl"
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.Sh DESCRIPTION
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The routine
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.Fn link_addr
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interprets character strings representing
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link-level addresses, returning binary information suitable
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for use in system calls.
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The routine
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.Fn link_ntoa
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takes
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a link-level
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address and returns an
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.Tn ASCII
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string representing some of the information present,
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including the link level address itself, and the interface name
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or number, if present.
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This facility is experimental and is
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still subject to change.
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.Pp
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For
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.Fn link_addr ,
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the string
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.Fa addr
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may contain
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an optional network interface identifier of the form
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.Dq "name unit-number" ,
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suitable for the first argument to
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.Xr ifconfig 8 ,
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followed in all cases by a colon and
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an interface address in the form of
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groups of hexadecimal digits
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separated by periods.
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Each group represents a byte of address;
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address bytes are filled left to right from
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low order bytes through high order bytes.
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.Pp
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.\" A regular expression may make this format clearer:
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.\" .Bd -literal -offset indent
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.\" ([a-z]+[0-9]+:)?[0-9a-f]+(\e.[0-9a-f]+)*
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.\" .Ed
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.\" .Pp
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Thus
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.Li le0:8.0.9.13.d.30
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represents an ethernet address
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to be transmitted on the first Lance ethernet interface.
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.Sh RETURN VALUES
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The
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.Fn link_ntoa
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function
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always returns a null terminated string.
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The
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.Fn link_addr
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function
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has no return value.
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(See
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.Sx BUGS . )
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.Sh SEE ALSO
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.Xr getnameinfo 3
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.Sh HISTORY
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The
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.Fn link_addr
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and
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.Fn link_ntoa
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functions appeared in
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.Bx 4.3 Reno .
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.Sh BUGS
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The returned values for link_ntoa
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reside in a static memory area.
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.Pp
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The function
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.Fn link_addr
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should diagnose improperly formed input, and there should be an unambiguous
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way to recognize this.
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.Pp
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If the
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.Va sdl_len
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field of the link socket address
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.Fa sdl
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is 0,
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.Fn link_ntoa
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will not insert a colon before the interface address bytes.
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If this translated address is given to
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.Fn link_addr
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without inserting an initial colon,
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the latter will not interpret it correctly.
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