327 lines
9.7 KiB
Groff
327 lines
9.7 KiB
Groff
.\" $NetBSD: hlfsd.8,v 1.2 2008/09/19 21:49:09 christos Exp $
|
|
.\"
|
|
.\"
|
|
.\" Copyright (c) 1997-2007 Erez Zadok
|
|
.\" Copyright (c) 1989 Jan-Simon Pendry
|
|
.\" Copyright (c) 1989 Imperial College of Science, Technology & Medicine
|
|
.\" Copyright (c) 1989 The Regents of the University of California.
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" Jan-Simon Pendry at Imperial College, London.
|
|
.\"
|
|
.\" 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.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgment:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
.\"
|
|
.\"
|
|
.\" File: am-utils/hlfsd/hlfsd.8
|
|
.\"
|
|
.\" HLFSD was written at Columbia University Computer Science Department, by
|
|
.\" Erez Zadok <ezk@cs.columbia.edu> and Alexander Dupuy <dupuy@smarts.com>
|
|
.\" It is distributed under the same terms and conditions as AMD.
|
|
.\"
|
|
.TH HLFSD 8 "14 September 1993"
|
|
.SH NAME
|
|
hlfsd \- home-link file system daemon
|
|
.SH SYNOPSIS
|
|
.B hlfsd
|
|
[
|
|
.B \-fhnpvC
|
|
] [
|
|
.BI \-a " alt_dir"
|
|
] [
|
|
.BI \-c " cache-interval"
|
|
] [
|
|
.BI \-g " group"
|
|
] [
|
|
.BI \-i " reload-interval"
|
|
] [
|
|
.BI \-l " logfile"
|
|
] [
|
|
.BI \-o " mount-options"
|
|
] [
|
|
.BI \-x " log-options"
|
|
] [
|
|
.BI \-D " debug-options"
|
|
] [
|
|
.BI \-P " password-file"
|
|
]
|
|
[
|
|
.I linkname
|
|
.RI [ " subdir " ]
|
|
]
|
|
.SH DESCRIPTION
|
|
.B Hlfsd
|
|
is a daemon which implements a filesystem containing a symbolic link to
|
|
subdirectory within a user's home directory, depending on the user
|
|
which accessed that link. It was primarily designed to redirect
|
|
incoming mail to users' home directories, so that it can read from
|
|
anywhere.
|
|
.LP
|
|
.B Hlfsd
|
|
operates by mounting itself as an
|
|
.SM NFS
|
|
server for the directory containing
|
|
.IR linkname ,
|
|
which defaults to
|
|
.BR /hlfs/home .
|
|
Lookups within that directory are handled by
|
|
.BR hlfsd ,
|
|
which uses the password map to determine how to resolve the lookup.
|
|
The directory will be created if it doesn't already exist. The symbolic link will be to the accessing user's home directory, with
|
|
.I subdir
|
|
appended to it. If not specified,
|
|
.I subdir
|
|
defaults to
|
|
.BR .hlfsdir .
|
|
This directory will also be created if it does not already exist.
|
|
.LP
|
|
A SIGTERM sent to
|
|
.B hlfsd
|
|
will cause it to shutdown. A SIGHUP will flush the internal
|
|
caches, and reload the password map. It will also close and
|
|
reopen the log file, to enable the original log file to be
|
|
removed or rotated. A SIGUSR1 will cause it to dump its internal
|
|
table of user IDs and home directories to the file
|
|
.BR /usr/tmp/hlfsd.dump.XXXXXX .
|
|
.SH OPTIONS
|
|
.TP
|
|
.BI \-a " alt_dir"
|
|
Alternate directory. The name of the directory to which
|
|
the symbolic link returned by
|
|
.B hlfsd
|
|
will point, if it cannot access the home directory of the user. This
|
|
defaults to
|
|
.BR /var/hlfs .
|
|
This directory will be created if it doesn't exist. It is expected
|
|
that either users will read these files, or the system administrators
|
|
will run a script to resend this "lost mail" to its owner.
|
|
.TP
|
|
.BI \-c " cache-interval"
|
|
Caching interval.
|
|
.B Hlfsd
|
|
will cache the validity of home directories for this interval, in
|
|
seconds. Entries which have been verified within the last
|
|
.I cache-interval
|
|
seconds will not be verified again, since the operation could
|
|
be expensive, and the entries are most likely still valid.
|
|
After the interval has expired,
|
|
.B hlfsd
|
|
will re-verify the validity of the user's home directory, and
|
|
reset the cache time-counter. The default value for
|
|
.I cache-interval
|
|
is 300 seconds (5 minutes).
|
|
.TP
|
|
.B \-f
|
|
Force fast startup. This option tells
|
|
.B hlfsd
|
|
to skip startup-time consistency checks such as existence of mount
|
|
directory, alternate spool directory, symlink to be hidden under the
|
|
mount directory, their permissions and validity.
|
|
.TP
|
|
.BI \-g " group"
|
|
Set the special group HLFS_GID to
|
|
.IR group .
|
|
Programs such as
|
|
.B from
|
|
or
|
|
.BR comsat ,
|
|
which access the mailboxes of other users) must be setgid HLFS_GID to
|
|
work properly. The default group is "hlfs". If no group is provided,
|
|
and there is no group "hlfs", this feature is disabled.
|
|
.TP
|
|
.B \-h
|
|
Help. Print a brief help message, and exit.
|
|
.TP
|
|
.BI \-i " reload-interval"
|
|
Map-reloading interval. Each
|
|
.I reload-interval
|
|
seconds,
|
|
.B hlfsd
|
|
will reload the password map.
|
|
.B Hlfsd
|
|
needs the password map for the UIDs and home directory pathnames.
|
|
.B Hlfsd
|
|
schedules a SIGALRM to reload the password maps. A SIGHUP sent to
|
|
.B hlfsd
|
|
will force it to reload the maps immediately. The default
|
|
value for
|
|
.I reload-interval
|
|
is 900 seconds (15 minutes.)
|
|
.TP
|
|
.BI \-l " logfile"
|
|
Specify a log file to which
|
|
.B hlfsd
|
|
will record events. If
|
|
.I logfile
|
|
is the string
|
|
.B syslog
|
|
then the log messages will be sent to the system log daemon by
|
|
.IR syslog (3),
|
|
using the LOG_DAEMON facility.
|
|
This is also the default.
|
|
.TP
|
|
.B \-n
|
|
No verify.
|
|
.B Hlfsd
|
|
will not verify the validity of the symbolic link it will be
|
|
returning, or that the user's home directory contains
|
|
sufficient disk-space for spooling. This can speed up
|
|
.B hlfsd
|
|
at the cost of possibly returning symbolic links to home
|
|
directories which are not currently accessible or are full.
|
|
By default,
|
|
.B hlfsd
|
|
validates the symbolic-link in the background.
|
|
The
|
|
.B \-n
|
|
option overrides the meaning of the
|
|
.B \-c
|
|
option, since no caching is necessary.
|
|
.TP
|
|
.BI \-o " mount-options"
|
|
Mount options. Mount options which
|
|
.B hlfsd
|
|
will use to mount itself on top of
|
|
.I dirname.
|
|
By default,
|
|
.IR mount-options
|
|
is set to "ro". If the system supports symbolic-link caching, default
|
|
options are set to "ro,nocache".
|
|
.TP
|
|
.B \-p
|
|
Print PID.
|
|
Outputs the process-id of
|
|
.B hlfsd
|
|
to standard output where it can be saved into a file.
|
|
.TP
|
|
.B \-v
|
|
Version. Displays version information to standard error.
|
|
.TP
|
|
.BI \-x " log-options"
|
|
Specify run-time logging options. The options are a comma separated
|
|
list chosen from: fatal, error, user, warn, info, map, stats, all.
|
|
.TP
|
|
.BI \-C
|
|
Force
|
|
.B hlfsd
|
|
to run on systems that cannot turn off the NFS attribute-cache. Use of
|
|
this option on those systems is discouraged, as it may result in loss
|
|
or mis-delivery of mail. The option is ignored on systems that can turn
|
|
off the attribute-cache.
|
|
.TP
|
|
.BI \-D " log-options"
|
|
Select from a variety of debugging options. Prefixing an
|
|
option with the string
|
|
.B no
|
|
reverses the effect of that option. Options are cumulative.
|
|
The most useful option is
|
|
.BR all .
|
|
Since this option is only used for debugging other options are not
|
|
documented here. A fuller description is available in the program
|
|
source. A SIGUSR1 sent to
|
|
.B hlfsd
|
|
will cause it to dump its internal password map to the file
|
|
.BR /usr/tmp/hlfsd.dump.XXXXXX .
|
|
.TP
|
|
.BI \-P " password-file"
|
|
Read the user-name, user-id, and home directory information from the file
|
|
.I password-file.
|
|
Normally,
|
|
.B hlfsd
|
|
will use
|
|
.IR getpwent (3)
|
|
to read the password database. This option allows you to override the
|
|
default database, and is useful if you want to map users' mail files to a
|
|
directory other than their home directory. Only the username, uid, and
|
|
home-directory fields of the file
|
|
.I password-file
|
|
are read and checked. All other fields are ignored. The file
|
|
.I password-file
|
|
must otherwise be compliant with Unix System 7 colon-delimited format
|
|
.IR passwd (5).
|
|
.SH FILES
|
|
.TP 5
|
|
.B /hlfs
|
|
directory under which
|
|
.B hlfsd
|
|
mounts itself and manages the symbolic link
|
|
.BR home .
|
|
.TP 5
|
|
.B .hlfsdir
|
|
default sub-directory in the user's home directory, to which the
|
|
.B home
|
|
symbolic link returned by
|
|
.B hlfsd
|
|
points.
|
|
.TP 5
|
|
.B /var/hlfs
|
|
directory to which
|
|
.B home
|
|
symbolic link returned by
|
|
.B hlfsd
|
|
points if it is unable to verify the that
|
|
user's home directory is accessible.
|
|
.SH "SEE ALSO"
|
|
.BR mail(1),
|
|
.BR getgrent (3),
|
|
.BR getpwent (3),
|
|
.BR passwd (5),
|
|
.\" .BR mnttab (4),
|
|
.\" .BR mtab (5),
|
|
.BR amd (8),
|
|
.\" .BR automount (8),
|
|
.BR cron(8),
|
|
.BR mount (8),
|
|
.BR sendmail (8),
|
|
.BR umount (8).
|
|
.LP
|
|
.IR "HLFSD: Delivering Email to Your $HOME" ,
|
|
in
|
|
.IR "Proc. LISA-VII, The 7th Usenix System Administration Conference" ,
|
|
November 1993.
|
|
.LP
|
|
``am-utils''
|
|
.BR info (1)
|
|
entry.
|
|
.LP
|
|
.I "Linux NFS and Automounter Administration"
|
|
by Erez Zadok, ISBN 0-7821-2739-8, (Sybex, 2001).
|
|
.LP
|
|
.I http://www.am-utils.org
|
|
.SH AUTHORS
|
|
Erez Zadok <ezk@cs.sunysb.edu>, Computer Science Department, Stony Brook
|
|
University, Stony Brook, New York, USA.
|
|
and
|
|
Alexander Dupuy <dupuy@smarts.com>, System Management ARTS,
|
|
White Plains, New York, USA.
|
|
.P
|
|
Other authors and contributors to am-utils are listed in the
|
|
.B AUTHORS
|
|
file distributed with am-utils.
|