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a44e4d1407
program parses the /etc/netgroup file into netgroup.byuser and netgroup.byhost format for NIS. I used hash tables to store the initial netgroup data in memory and to construct the 'reverse' netgroup output. It seems just as fast as the SunOS revnetgroup, which is surprising considering this is my first attempt at using hash tables in a real application. :) Note that I canibalized a large chunk of getnetgrent.c to save myself from having to write my own netgroup parsing functions.
138 lines
4.5 KiB
Groff
138 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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.\" $Id$
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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 revnetgroup
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.Fl u
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.Fl h
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.Op Fl f Ar netgroup_file
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.Sh DESCRIPTION
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.Nm revnetgroup
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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. 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. This information is used to generate the
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.Nm netgroup.byuser
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and
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.Nm netgroup.byhosts
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NIS maps. 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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.Nm /etc/netgroup
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file may list a netgroup and a list of its members. Here, the
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netgroup is considered the
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.Pa key
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and the member names are the
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.Pa data .
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By contrast, the reverse
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.Nm 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. Seperate 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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NIS 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. 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 revnetgroup
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command prints its results on the standard output. It is usually called
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only by
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.Nm /var/yp/Makefile
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when rebuilding the NIS netgroup maps.
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.Pp
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.Sh OPTIONS
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The
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.Nm revnetgroup
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command supports the following options:
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.Bl -tag -width flag
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.It Fl u
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Generate netgroup.byuser 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 netgroup.byhost output; only hostname information in the
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original netgroup file is processed. (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 revnetgroup
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command uses
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.Nm /etc/netgroup
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as its default input file. The
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.Fl f
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flag allows the user to specify an alternate input file. Specifying ``-''
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as the input file causes
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.Nm revnetgroup
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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 Pa -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 revnetgroup
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to build the NIS databases.
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.It Pa /etc/netgroup
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The default netgroup database file. This file is most often found
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only on the NIS master server.
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.El
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.Sh SEE ALSO
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.Xr yp 4 ,
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.Xr netgroup 5 ,
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.Xr yp_mkdb 8 ,
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.Xr getnetgrent 3
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.Sh AUTHOR
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Bill Paul <wpaul@ctr.columbia.edu>
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