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-.\" Copyright (c) 2009 Rick Macklem, University of Guelph
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd April 25, 2009
-.Dt NFSCBD 8
-.Os
-.Sh NAME
-.Nm nfscbd
-.Nd
-.Tn NFSv4
-client side callback daemon
-.Sh SYNOPSIS
-.Nm nfscbd
-.Op Fl p Ar port_number
-.Op Fl P Ar client_principal
-.Sh DESCRIPTION
-.Nm
-runs on a client using
-.Tn NFSv4
-to handle callback requests from the NFSv4 server.
-If no
-.Nm
-is running, NFSv4 mounts will still work, but the server will never issue
-Open Delegations to the client.
-.Pp
-One callback server and one master server
-are always started.
-.Pp
-The following options are available:
-.Bl -tag -width Ds
-.It Fl p Ar port_number
-Specifies what port# the callback server should use.
-.It Fl P Ar client_principal
-Specifies the host based principal name to be used as the target for
-callbacks over RPCSEC_GSS. For KerberosV, it must be in the client's
-default keytab file.
-This client_principal should be the same one specified by the
-.Cm gssname
-argument being used by nfsv4 mounts.
-If you do not specify this argument, callbacks will still work over AUTH_SYS,
-which is what many extant servers use even for RPCSEC_GSS mounts, as of 2009.
-.El
-.Pp
-For example,
-.Dq Li "nfscbd -p 7654 -P root"
-starts the daemon to handle callbacks on port# 7654 and is using the host based
-principal root@<client-host>.<dns-domain> as the callback target.
-.Pp
-.Nm
-listens for service requests at the port
-defined by NFSV4_CBPORT in /usr/include/fs/nfs/nfs.h, unless
-.Fl p
-has been specified.
-For more information on what callbacks and Open Delegations do, see
-.%T "Network File System (NFS) Version 4 Protocol" ,
-RFC3530.
-.Pp
-The
-.Nm
-utility exits 0 on success or >0 if an error occurred.
-.Sh SEE ALSO
-.Xr nfsv4 4 ,
-.Xr mount_nfs 8
-.Sh HISTORY
-First introduced with the experimental nfs client for NFSv4 support in 2009.