freebsd/usr.sbin/yp_mkdb/yp_mkdb.8

.\" Copyright (c) 1995, 1996
.\"	Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
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.\"	$Id: yp_mkdb.8,v 1.5 1997/02/22 16:14:49 peter Exp $
.\"
.Dd March 12, 1996
.Dt YP_MKDB 8
.Os
.Sh NAME
.Nm yp_mkdb
.Nd "generate the NIS databases"
.Sh SYNOPSIS
.Nm yp_mkdb
.Fl c
.Nm yp_mkdb
.Fl u Ar dbname
.Nm yp_mkdb
.Op Fl c
.Op Fl b
.Op Fl s
.Op Fl i Ar inputfile
.Op Fl o Ar outputfile
.Op Fl m Ar mastername
.Ar inputfile
.Ar dbname
.Sh DESCRIPTION
.Nm yp_mkdb
creates
.Xr db 3
style databases for use with FreeBSD's NIS server.
.Nm yp_mkdb
reads data from
.Nm inputfile ,
and writes it to
.Nm dbname
in
.Xr db 3
format (using the hash table method).
The input should be in 'key data' format, which is to say
two fields of ASCII data separated by white space. The first field
is assumed to be the key, and everything else is assumed to be
the data.
These databases are typically stored in
.Nm /var/yp/[domainname]
where
.Nm domainname
is the name of the NIS domain being served. 
.Nm yp_mkdb
is usually invoked by
.Nm /var/yp/Makefile.
.Nm yp_mkdb
can also be used to dump an NIS database file so that its
contents can be examined. For security reasons, all databases that
.Nm yp_mkdb
creates are readable and writable by owner only (and usually the
owner is root).
.Sh OPTIONS
The
.Nm yp_mkdb
command supports the following flags and options:
.Bl -tag -width flag
.It Fl c
Causes
.Nm yp_mkdb
to send a YPPROC_CLEAR request to
.Xr ypserv 8
on the local host. This signal tells the server to close any open
database descriptors and flush out its database cache. If used alone,
this flag signals the server and does nothing else. If used as part
of a database creation command,
.Nm yp_mkdb
will send the signal only after the new database has been successfully
created.
.It Fl b
This flag causes
.Nm yp_mkdb
to add a special entry to the database with a key of
.Em YP_INTERDOMAIN
and an empty data field. If this key is present in a map, it alters the
behavior of the 'match' procedure in
.Xr ypserv 8
slightly. If a match query fails (because the server couldn't find
a record that matched the supplied key), and the
.Em YP_INTERDOMAIN
key exists within the queried map,
.Xr ypserv 8
will try to match the entry again using a DNS lookup. Note that this
special behavior only applies to the
.Em hosts
maps. Using the
.Fl b
flag for other maps has no effect.
.Pp
.It Fl s
This flag is used to add a special entry to the database with a key of
.Em YP_SECURE
and an empty data field. If this key is present in a map,
.Xr ypserv 8
will deny access to the map to any client that is not using a
reserved port for its query. This is used mainly for the
.Em master.passwd
maps, which should be restricted to privileged access only.
.Pp
.It Fl u Ar dbname
.Pp
Dump (or 'unwind') an NIS database. This option can be used to
inspect the contents of an existing NIS database.
.It Op Fl i Ar inputfile
.Pp
When generating an NIS map, encode
.Nm inputfile
as a special entry in the database with a key of
.Em YP_INPUT_FILE .
.Pp
.It Op Fl o Ar outputfile
.Pp
When generating an NIS map, encode
.Nm outputfile
as a special entry in the database with a key of
.Em YP_OUTPUT_FILE .
.Pp
.It Op Fl m Ar mastername
.Pp
When generating an NIS map encode
.Nm mastername
as a special entry in the database with a key of
.Em YP_MASTER_NAME .
This entry in the database is frequently used by various NIS utilities
to determine the name of an NIS master server for a domain. By default,
.Nm yp_mkdb
assumes that the local host is the NIS master; the
.Ar m
option is used to override this default.
.Sh FILES
.Bl -tag -width Pa -compact
.It Pa /var/yp/Makefile
The Makefile that calls
.Nm yp_mkdb
to build the NIS databases.
.Sh SEE ALSO
.Xr db 3 ,
.Xr ypserv 8
.Sh AUTHOR
Bill Paul <wpaul@ctr.columbia.edu>