7e6cabd06e
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
171 lines
4.4 KiB
Groff
171 lines
4.4 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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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.\" @(#)getnetent.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd June 4, 1993
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.Dt GETNETENT 3
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.Os
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.Sh NAME
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.Nm getnetent ,
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.Nm getnetbyaddr ,
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.Nm getnetbyname ,
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.Nm setnetent ,
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.Nm endnetent
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.Nd get network entry
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In netdb.h
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.Ft struct netent *
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.Fn getnetent void
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.Ft struct netent *
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.Fn getnetbyname "const char *name"
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.Ft struct netent *
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.Fn getnetbyaddr "uint32_t net" "int type"
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.Ft void
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.Fn setnetent "int stayopen"
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.Ft void
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.Fn endnetent void
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.Sh DESCRIPTION
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The
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.Fn getnetent ,
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.Fn getnetbyname ,
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and
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.Fn getnetbyaddr
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functions
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each return a pointer to an object with the
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following structure describing an internet network.
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This structure contains either the information obtained
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from the nameserver,
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.Xr named 8 ,
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broken-out fields of a line in the network data base
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.Pa /etc/networks ,
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or entries supplied by the
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.Xr yp 8
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system.
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The order of the lookups is controlled by the
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`networks' entry in
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.Xr nsswitch.conf 5 .
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.Bd -literal -offset indent
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struct netent {
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char *n_name; /* official name of net */
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char **n_aliases; /* alias list */
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int n_addrtype; /* net number type */
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uint32_t n_net; /* net number */
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};
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.Ed
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.Pp
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The members of this structure are:
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.Bl -tag -width n_addrtype
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.It Fa n_name
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The official name of the network.
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.It Fa n_aliases
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A zero terminated list of alternate names for the network.
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.It Fa n_addrtype
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The type of the network number returned; currently only AF_INET.
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.It Fa n_net
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The network number.
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Network numbers are returned in machine byte
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order.
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.El
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.Pp
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The
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.Fn getnetent
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function
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reads the next line of the file, opening the file if necessary.
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.Pp
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The
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.Fn setnetent
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function
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opens and rewinds the file.
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If the
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.Fa stayopen
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flag is non-zero,
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the net data base will not be closed after each call to
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.Fn getnetbyname
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or
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.Fn getnetbyaddr .
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.Pp
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The
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.Fn endnetent
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function
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closes the file.
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.Pp
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The
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.Fn getnetbyname
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function
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and
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.Fn getnetbyaddr
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sequentially search from the beginning
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of the file until a matching
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net name or
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net address and type is found,
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or until
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.Dv EOF
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is encountered.
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The
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.Fa type
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argument
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must be
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.Dv AF_INET .
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Network numbers are supplied in host order.
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.Sh FILES
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.Bl -tag -width /etc/nsswitch.conf -compact
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.It Pa /etc/networks
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.It Pa /etc/nsswitch.conf
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.It Pa /etc/resolv.conf
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.El
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.Sh DIAGNOSTICS
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Null pointer returned on
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.Dv EOF
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or error.
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.Sh SEE ALSO
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.Xr networks 5
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.Pp
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.%T RFC 1101
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.Sh HISTORY
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The
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.Fn getnetent ,
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.Fn getnetbyaddr ,
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.Fn getnetbyname ,
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.Fn setnetent ,
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and
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.Fn endnetent
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functions appeared in
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.Bx 4.2 .
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.Sh BUGS
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The data space used by
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these functions is thread-specific; if future use requires the data, it should be
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copied before any subsequent calls to these functions overwrite it.
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Only Internet network
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numbers are currently understood.
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Expecting network numbers to fit
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in no more than 32 bits is probably
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naive.
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