160 lines
4.5 KiB
Groff
160 lines
4.5 KiB
Groff
.\" Copyright (c) 1995
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.\" Bill Paul <wpaul@ctr.columbia.edu>. 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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Bill Paul.
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.\" 4. 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 Bill Paul 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 Bill Paul 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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.\" $FreeBSD$
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.\"
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.Dd October 24, 1995
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.Dt REVNETGROUP 8
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.Os
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.Sh NAME
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.Nm revnetgroup
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.Nd "generate reverse netgroup data"
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.Sh SYNOPSIS
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.Nm
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.Fl u | h
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.Op Fl f Ar netgroup_file
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.Sh DESCRIPTION
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The
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.Nm
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utility processes the contents of a file in
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.Xr netgroup 5
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format into what is called
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.Pa reverse netgroup
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form.
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That is, where the original file shows
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netgroup memberships in terms of which members reside in a particular
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group, the reverse netgroup format specifies what groups are associated
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with a particular member.
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This information is used to generate the
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.Pa netgroup.byuser
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and
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.Pa netgroup.byhosts
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.Tn NIS
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maps.
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These reverse netgroup maps are used to help speed up
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netgroup lookups, particularly for the
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.Fn innetgr
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library function.
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.Pp
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For example, the standard
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.Pa /etc/netgroup
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file may list a netgroup and a list of its members.
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Here, the
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netgroup is considered the
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.Em key
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and the member names are the
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.Em data .
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By contrast, the reverse
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.Pa netgroup.byusers
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database lists each unique
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member as the key and the netgroups to which the members belong become
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the data.
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Separate databases are created to hold information pertaining
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to users and hosts; this allows netgroup username lookups
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and netgroup hostname lookups to be performed using independent keyspaces.
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.Pp
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By constructing these reverse netgroup databases (and the corresponding
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.Tn NIS
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maps) in advance, the
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.Xr getnetgrent 3
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library functions are spared from having to work out the dependencies
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themselves on the fly.
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This is important on networks with large numbers
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of users and hosts, since it can take a considerable amount of time
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to process very large netgroup databases.
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.Pp
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The
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.Nm
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utility prints its results on the standard output.
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It is usually called
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only by
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.Pa /var/yp/Makefile
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when rebuilding the
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.Tn NIS
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netgroup maps.
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.Sh OPTIONS
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The
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.Nm
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utility supports the following options:
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.Bl -tag -width indent
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.It Fl u
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Generate
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.Pa netgroup.byuser
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output; only username information in the
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original netgroup file is processed.
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.It Fl h
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Generate
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.Pa netgroup.byhost
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output; only hostname information in the
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original netgroup file is processed.
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(Note at least one of the
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.Fl u
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or
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.Fl h
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flags must be specified.)
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.It Op Fl f Ar netgroup_file
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The
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.Nm
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utility uses
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.Pa /etc/netgroup
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as its default input file.
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The
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.Fl f
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flag allows the user to specify an alternate input file.
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Specifying ``-''
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as the input file causes
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.Nm
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to read from the standard input.
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.El
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.Sh FILES
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.Bl -tag -width /var/yp/Makefile -compact
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.It Pa /var/yp/Makefile
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the Makefile that calls
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.Nm yp_mkdb
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and
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.Nm
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to build the
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.Tn NIS
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databases
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.It Pa /etc/netgroup
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the default netgroup database file.
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This file is most often found
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only on the
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.Tn NIS
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master server
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.El
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.Sh SEE ALSO
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.Xr getnetgrent 3 ,
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.Xr netgroup 5 ,
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.Xr yp 8 ,
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.Xr yp_mkdb 8
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.Sh AUTHORS
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.An Bill Paul Aq wpaul@ctr.columbia.edu
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