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3. Neither the name of the project nor the names of its contributors
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THIS SOFTWARE IS PROVIDED BY THE PROJECT 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
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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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
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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
SUCH DAMAGE.
$FreeBSD: src/lib/libutil/realhostname_sa.3,v 1.11 2005/02/13 22:25:14 ru Exp $
.Dd January 11, 2000 .Os .Dt REALHOSTNAME_SA 3 .Sh NAME .Nm realhostname_sa .Nd "convert a" .Vt "struct sockaddr" to the real host name .Sh LIBRARY .Lb libutil .Sh SYNOPSIS n sys/types.h n netinet/in.h n 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 .
p .Ar host must point to a buffer of at least .Ar hsize bytes, and will always be written to by this function.
p 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.
p 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 n libutil.h :
p l -tag -width XXX -offset XXX t Li HOSTNAME_FOUND A valid host name was found. t 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 . t Li HOSTNAME_INVALIDADDR .Ar ip could not be resolved. .Ar host now contains the numeric value of .Ar ip . t 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