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131 lines
4.5 KiB
Groff
131 lines
4.5 KiB
Groff
.\" Copyright (C) 1995, 1996, 1997, 1998, 1999, and 2000 WIDE Project.
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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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.\" 3. Neither the name of the project 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 PROJECT 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 PROJECT 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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.\" Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
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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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.Dd January 11, 2000
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.Dt REALHOSTNAME_SA 3
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.Os
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.Sh NAME
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.Nm realhostname_sa
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.Nd "convert a"
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.Vt "struct sockaddr"
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to the real host name
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.Sh LIBRARY
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.Lb libutil
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.Sh SYNOPSIS
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.In sys/types.h
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.In netinet/in.h
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.In libutil.h
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.Ft int
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.Fn realhostname_sa "char *host" "size_t hsize" "struct sockaddr *addr" "int addrlen"
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.Sh DESCRIPTION
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The function
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.Fn realhostname_sa
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converts
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.Ar addr
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to the corresponding host name.
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This is done by resolving
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.Ar addr
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to a host name and then ensuring that the host name resolves
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back to
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.Ar addr .
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.Pp
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.Ar host
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must point to a buffer of at least
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.Ar hsize
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bytes, and will always be written to by this function.
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.Pp
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If the name resolution does not work both ways or if the host name is longer
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than
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.Ar hsize
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bytes,
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.Xr getnameinfo 3
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with NI_NUMERICHOST specified, is used to convert
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.Ar addr
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to an ASCII form.
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.Pp
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If the string written to
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.Ar host
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is
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.Ar hsize
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bytes long,
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.Ar host
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will not be NUL terminated.
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.Sh RETURN VALUES
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The
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.Fn realhostname_sa
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function will return one of the following constants which are defined in
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.In libutil.h :
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.Bl -tag -width XXX -offset XXX
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.It Li HOSTNAME_FOUND
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A valid host name was found.
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.It Li HOSTNAME_INCORRECTNAME
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A host name was found, but it did not resolve back to the passed
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.Ar ip .
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.Ar host
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now contains the numeric value of
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.Ar ip .
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.It Li HOSTNAME_INVALIDADDR
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.Ar ip
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could not be resolved.
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.Ar host
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now contains the numeric value of
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.Ar ip .
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.It Li HOSTNAME_INVALIDNAME
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A host name was found, but it could not be resolved back to any ip number.
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.Ar host
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now contains the numeric value of
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.Ar ip .
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.El
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.Sh SEE ALSO
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.Xr getaddrinfo 3 ,
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.Xr getnameinfo 3 ,
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.Xr realhostname 3
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