86 lines
3.0 KiB
Groff
86 lines
3.0 KiB
Groff
.\"
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.\" Copyright (C) 2000, 2001 Internet Software Consortium.
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
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.\" DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
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.\" INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
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.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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.\" FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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.\" NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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.\" WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.TH "LWRES_GETNAMEINFO" "3" "Jun 30, 2000" "BIND9" ""
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.SH NAME
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lwres_getnameinfo \- lightweight resolver socket address structure to hostname and service name
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.SH SYNOPSIS
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\fB#include <lwres/netdb.h>
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.sp
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.na
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int
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lwres_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags);
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.ad
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\fR
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.SH "DESCRIPTION"
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.PP
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This function is equivalent to the \fBgetnameinfo\fR(3) function defined in RFC2133.
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\fBlwres_getnameinfo()\fR returns the hostname for the
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\fBstruct sockaddr\fR \fIsa\fR which is
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\fIsalen\fR bytes long. The hostname is of length
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\fIhostlen\fR and is returned via
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\fI*host.\fR The maximum length of the hostname is
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1025 bytes: NI_MAXHOST.
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.PP
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The name of the service associated with the port number in
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\fIsa\fR is returned in \fI*serv.\fR
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It is \fIservlen\fR bytes long. The maximum length
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of the service name is NI_MAXSERV - 32 bytes.
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.PP
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The \fIflags\fR argument sets the following
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bits:
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.TP
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\fBNI_NOFQDN\fR
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A fully qualified domain name is not required for local hosts.
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The local part of the fully qualified domain name is returned instead.
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.TP
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\fBNI_NUMERICHOST\fR
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Return the address in numeric form, as if calling inet_ntop(),
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instead of a host name.
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.TP
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\fBNI_NAMEREQD\fR
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A name is required. If the hostname cannot be found in the DNS and
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this flag is set, a non-zero error code is returned.
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If the hostname is not found and the flag is not set, the
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address is returned in numeric form.
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.TP
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\fBNI_NUMERICSERV\fR
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The service name is returned as a digit string representing the port number.
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.TP
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\fBNI_DGRAM\fR
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Specifies that the service being looked up is a datagram
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service, and causes getservbyport() to be called with a second
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argument of "udp" instead of its default of "tcp". This is required
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for the few ports (512-514) that have different services for UDP and
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TCP.
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.SH "RETURN VALUES"
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.PP
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\fBlwres_getnameinfo()\fR
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returns 0 on success or a non-zero error code if an error occurs.
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.SH "SEE ALSO"
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.PP
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\fBRFC2133\fR,
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\fBgetservbyport\fR(3),
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\fBlwres\fR(3),
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\fBlwres_getnameinfo\fR(3),
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\fBlwres_getnamebyaddr\fR(3).
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\fBlwres_net_ntop\fR(3).
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.SH "BUGS"
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.PP
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RFC2133 fails to define what the nonzero return values of
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\fBgetnameinfo\fR(3)
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are.
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