88 lines
3.1 KiB
Groff
88 lines
3.1 KiB
Groff
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.\" Copyright (c) 2009 Rick Macklem, University of Guelph
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.\" 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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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 April 25, 2009
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.Dt NFSCBD 8
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.Os
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.Sh NAME
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.Nm nfscbd
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.Tn NFSv4
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client side callback daemon
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.Sh SYNOPSIS
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.Nm nfscbd
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.Op Fl p Ar port_number
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.Op Fl P Ar client_principal
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.Sh DESCRIPTION
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.Nm
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runs on a client using
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.Tn NFSv4
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to handle callback requests from the NFSv4 server.
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If no
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.Nm
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is running, NFSv4 mounts will still work, but the server will never issue
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Open Delegations to the client.
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.Pp
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One callback server and one master server
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are always started.
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.Pp
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The following options are available:
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.Bl -tag -width Ds
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.It Fl p Ar port_number
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Specifies what port# the callback server should use.
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.It Fl P Ar client_principal
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Specifies the host based principal name to be used as the target for
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callbacks over RPCSEC_GSS. For KerberosV, it must be in the client's
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default keytab file.
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This client_principal should be the same one specified by the
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.Cm gssname
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argument being used by nfsv4 mounts.
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If you do not specify this argument, callbacks will still work over AUTH_SYS,
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which is what many extant servers use even for RPCSEC_GSS mounts, as of 2009.
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.El
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.Pp
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For example,
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.Dq Li "nfscbd -p 7654 -P root"
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starts the daemon to handle callbacks on port# 7654 and is using the host based
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principal root@<client-host>.<dns-domain> as the callback target.
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.Pp
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.Nm
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listens for service requests at the port
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defined by NFSV4_CBPORT in /usr/include/fs/nfs/nfs.h, unless
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.Fl p
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has been specified.
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For more information on what callbacks and Open Delegations do, see
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.%T "Network File System (NFS) Version 4 Protocol" ,
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RFC3530 .
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.Pp
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The
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.Nm
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utility exits 0 on success or >0 if an error occurred.
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.Sh SEE ALSO
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.Xr nfsv4 4 ,
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.Xr mount_nfs 8
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.Sh HISTORY
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First introduced with the experimental nfs client for NFSv4 support in 2009.
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