99 lines
3.7 KiB
Groff
99 lines
3.7 KiB
Groff
.\" Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
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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 ISC DISCLAIMS ALL WARRANTIES WITH
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.\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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.\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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.\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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.\" PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" $Id: lwres_getnameinfo.3,v 1.26 2005/10/13 03:14:01 marka Exp $
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.\"
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.hy 0
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.ad l
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.\" ** You probably do not want to edit this file directly **
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.\" It was generated using the DocBook XSL Stylesheets (version 1.69.1).
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.\" Instead of manually editing it, you probably should edit the DocBook XML
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.\" source for it and then use the DocBook XSL Stylesheets to regenerate it.
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.TH "LWRES_GETNAMEINFO" "3" "Jun 30, 2000" "BIND9" "BIND9"
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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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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.nf
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#include <lwres/netdb.h>
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.fi
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.HP 22
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\fBint\ \fBlwres_getnameinfo\fR\fR\fB(\fR\fBconst\ struct\ sockaddr\ *\fR\fB\fIsa\fR\fR\fB, \fR\fBsize_t\ \fR\fB\fIsalen\fR\fR\fB, \fR\fBchar\ *\fR\fB\fIhost\fR\fR\fB, \fR\fBsize_t\ \fR\fB\fIhostlen\fR\fR\fB, \fR\fBchar\ *\fR\fB\fIserv\fR\fR\fB, \fR\fBsize_t\ \fR\fB\fIservlen\fR\fR\fB, \fR\fBint\ \fR\fB\fIflags\fR\fR\fB);\fR
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.SH "DESCRIPTION"
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.PP
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This function is equivalent to the
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\fBgetnameinfo\fR(3)
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function defined in RFC2133.
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\fBlwres_getnameinfo()\fR
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returns the hostname for the
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\fBstruct sockaddr\fR\fIsa\fR
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which is
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\fIsalen\fR
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bytes long. The hostname is of length
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\fIhostlen\fR
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and is returned via
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\fI*host.\fR
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The maximum length of the hostname is 1025 bytes:
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\fBNI_MAXHOST\fR.
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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
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is returned in
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\fI*serv.\fR
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It is
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\fIservlen\fR
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bytes long. The maximum length of the service name is
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\fBNI_MAXSERV\fR
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\- 32 bytes.
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.PP
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The
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\fIflags\fR
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argument sets the following 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. 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(), 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 this flag is set, a non\-zero error code is returned. If the hostname is not found and the flag is not set, the 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 service, and causes getservbyport() to be called with a second argument of "udp" instead of its default of "tcp". This is required for the few ports (512\-514) that have different services for UDP and 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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