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.\" Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" 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
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.\" $FreeBSD: release/10.0.0/lib/libutil/realhostname_sa.3 213573 2010-10-08 12:40:16Z uqs $
.\"
.Dd January 11, 2000
.Dt REALHOSTNAME_SA 3
.Os
.Sh NAME
.Nm realhostname_sa
.Nd "convert a"
.Vt "struct sockaddr"
to the real host name
.Sh LIBRARY
.Lb libutil
.Sh SYNOPSIS
.In sys/types.h
.In netinet/in.h
.In libutil.h
.Ft int
.Fn realhostname_sa "char *host" "size_t hsize" "struct sockaddr *addr" "int addrlen"
.Sh DESCRIPTION
The function
.Fn realhostname_sa
converts
.Ar addr
to the corresponding host name.
This is done by resolving
.Ar addr
to a host name and then ensuring that the host name resolves
back to
.Ar addr .
.Pp
.Ar host
must point to a buffer of at least
.Ar hsize
bytes, and will always be written to by this function.
.Pp
If the name resolution does not work both ways or if the host name is longer
than
.Ar hsize
bytes,
.Xr getnameinfo 3
with NI_NUMERICHOST specified, is used to convert
.Ar addr
to an ASCII form.
.Pp
If the string written to
.Ar host
is
.Ar hsize
bytes long,
.Ar host
will not be NUL terminated.
.Sh RETURN VALUES
The
.Fn realhostname_sa
function will return one of the following constants which are defined in
.In libutil.h :
.Bl -tag -width XXX -offset XXX
.It Li HOSTNAME_FOUND
A valid host name was found.
.It Li HOSTNAME_INCORRECTNAME
A host name was found, but it did not resolve back to the passed
.Ar ip .
.Ar host
now contains the numeric value of
.Ar ip .
.It Li HOSTNAME_INVALIDADDR
.Ar ip
could not be resolved.
.Ar host
now contains the numeric value of
.Ar ip .
.It Li HOSTNAME_INVALIDNAME
A host name was found, but it could not be resolved back to any ip number.
.Ar host
now contains the numeric value of
.Ar ip .
.El
.Sh SEE ALSO
.Xr getaddrinfo 3 ,
.Xr getnameinfo 3 ,
.Xr realhostname 3
