151 lines
4.8 KiB
Groff
151 lines
4.8 KiB
Groff
.\" Copyright (c) 1995, 1996
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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 author nor the names of 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 June 2, 1996
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.Dt RPC.YPXFRD 8
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.Os
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.Sh NAME
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.Nm rpc.ypxfrd
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.Nd "NIS map transfer server"
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.Sh SYNOPSIS
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.Nm
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.Op Fl p Ar path
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.Sh DESCRIPTION
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The
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.Nm
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daemon is used to speed up the distribtion of very large NIS maps
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from NIS master to NIS slave servers.
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The normal method for transfering
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maps involves several steps:
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.Bl -bullet -offset indent
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.It
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The master server calls
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.Xr yppush 8
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to inform the slave servers to start a transfer.
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.It
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The slave servers invoke
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.Xr ypxfr 8 ,
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which reads the entire contents of a map from the master server
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using the yp_all() function.
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.It
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The
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.Xr ypxfr 8
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program then creates a new map database file by using the
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.Xr db 3
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library hash method to store the data that it receives from the server.
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.It
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When all the data has been retrieved,
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.Xr ypxfr 8
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moves the new file into place and sends
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.Xr ypserv 8
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on the local machine a YPPROC_CLEAR to tell it to refresh its
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database handles.
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.El
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.Pp
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This process can take several minutes when there are very large
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maps involved.
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For example: a passwd database with several tens of
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thousands of entries can consume several megabytes of disk space,
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and it can take the
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.Xr db 3
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library package a long time to sort and store all the records
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in a hash database.
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Consider also that there are two sets of map
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files:
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.Pa master.passwd.by{name,uid}
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and
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.Pa passwd.by{name,uid} .
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.Pp
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The
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.Nm
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server speeds up the transfer process by allowing NIS slave servers to
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simply copy the master server's map files rather than building their
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own from scratch.
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Simply put,
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.Nm
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implements an RPC-based file transfer protocol.
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Transfering even
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a multi-megabyte file in this fashion takes only a few seconds compared
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to the several minutes it would take even a reasonably fast slave server
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to build a new map from scratch.
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.Pp
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The
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.Nm
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server uses the same access restriction mechanism as
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.Xr ypserv 8 .
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This means that slave servers will only be permitted to transfer
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files if the rules in the
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.Xr securenets 5
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database permit it.
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Furthermore, only slave servers using reserved
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ports will be allowed to transfer the
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.Pa master.passwd
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maps.
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.Sh OPTIONS
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The following option is available:
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.Bl -tag -width indent
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.It Fl p Ar path
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This option can be used to override the default path to
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the location of the NIS
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map databases.
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The compiled-in default path is
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.Pa /var/yp .
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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/[domainname]/[maps]
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The NIS maps for a particular NIS domain.
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.El
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.Sh SEE ALSO
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.Xr yp 8 ,
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.Xr yppush 8 ,
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.Xr ypserv 8 ,
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.Xr ypxfr 8
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.Sh BUGS
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The
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.Fx
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.Nm ypxfrd
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protocol is not compatible with that used by SunOS.
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This is unfortunate
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but unavoidable: Sun's protocol is not freely available, and even if it
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were it would probably not be useful since the SunOS NIS v2 implementation
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uses the original ndbm package for its map databases whereas the
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.Fx
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implementation uses Berkeley DB.
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These two packages use vastly different
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file formats.
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Furthermore, ndbm is byte-order sensitive and not very
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smart about it, meaning that am ndbm database created on a big endian
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system can't be read on a little endian system.
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.Sh AUTHORS
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.An Bill Paul Aq wpaul@ctr.columbia.edu
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