313 lines
9.5 KiB
Groff
313 lines
9.5 KiB
Groff
.\" $NetBSD: hlfsd.8,v 1.1.1.5 1999/02/01 18:46:33 christos Exp $
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.\"
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.\"
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.\" Copyright (c) 1997-1999 Erez Zadok
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.\" Copyright (c) 1989 Jan-Simon Pendry
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.\" Copyright (c) 1989 Imperial College of Science, Technology & Medicine
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.\" Copyright (c) 1989 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Jan-Simon Pendry at Imperial College, London.
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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 acknowledgment:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its 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 THE REGENTS 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 REGENTS 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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.\" Id: hlfsd.8,v 1.2 1999/01/10 21:54:32 ezk Exp
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.\"
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.\" HLFSD was written at Columbia University Computer Science Department, by
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.\" Erez Zadok <ezk@cs.columbia.edu> and Alexander Dupuy <dupuy@smarts.com>
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.\" It is distributed under the same terms and conditions as AMD.
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.\"
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.TH HLFSD 8 "14 September 1993"
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.SH NAME
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hlfsd \- home-link file system daemon
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.SH SYNOPSIS
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.B hlfsd
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[
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.B \-fhnpvC
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] [
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.BI \-a " alt_dir"
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] [
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.BI \-c " cache-interval"
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] [
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.BI \-g " group"
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] [
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.BI \-i " reload-interval"
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] [
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.BI \-l " logfile"
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] [
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.BI \-o " mount-options"
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] [
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.BI \-x " log-options"
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] [
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.BI \-D " debug-options"
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] [
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.BI \-P " password-file"
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]
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[
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.I linkname
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.RI [ " subdir " ]
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]
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.SH DESCRIPTION
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.B Hlfsd
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is a daemon which implements a filesystem containing a symbolic link to
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subdirectory within a user's home directory, depending on the user
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which accessed that link. It was primarily designed to redirect
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incoming mail to users' home directories, so that it can read from
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anywhere.
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.LP
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.B Hlfsd
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operates by mounting itself as an
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.SM NFS
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server for the directory containing
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.IR linkname ,
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which defaults to
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.BR /hlfs/home .
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Lookups within that directory are handled by
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.BR hlfsd ,
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which uses the password map to determine how to resolve the lookup.
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The directory will be created if it doesn't already exist. The symbolic link will be to the accessing user's home directory, with
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.I subdir
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appended to it. If not specified,
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.I subdir
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defaults to
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.BR .hlfsdir .
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This directory will also be created if it does not already exist.
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.LP
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A SIGTERM sent to
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.B hlfsd
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will cause it to shutdown. A SIGHUP will flush the internal
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caches, and reload the password map. It will also close and
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reopen the log file, to enable the original log file to be
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removed or rotated. A SIGUSR1 will cause it to dump its internal
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table of user IDs and home directories to the file
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.BR /usr/tmp/hlfsd.dump.XXXXXX .
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.SH OPTIONS
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.TP
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.BI \-a " alt_dir"
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Alternate directory. The name of the directory to which
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the symbolic link returned by
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.B hlfsd
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will point, if it cannot access the home directory of the user. This
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defaults to
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.BR /var/hlfs .
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This directory will be created if it doesn't exist. It is expected
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that either users will read these files, or the system administrators
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will run a script to resend this "lost mail" to its owner.
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.TP
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.BI \-c " cache-interval"
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Caching interval.
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.B Hlfsd
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will cache the validity of home directories for this interval, in
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seconds. Entries which have been verified within the last
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.I cache-interval
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seconds will not be verified again, since the operation could
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be expensive, and the entries are most likely still valid.
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After the interval has expired,
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.B hlfsd
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will re-verify the validity of the user's home directory, and
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reset the cache time-counter. The default value for
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.I cache-interval
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is 300 seconds (5 minutes).
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.TP
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.B \-f
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Force fast startup. This option tells
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.B hlfsd
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to skip startup-time consistency checks such as existence of mount
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directory, alternate spool directory, symlink to be hidden under the
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mount directory, their permissions and validity.
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.TP
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.BI \-g " group"
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Set the special group HLFS_GID to
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.IR group .
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Programs such as
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.B from
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or
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.BR comsat ,
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which access the mailboxes of other users) must be setgid HLFS_GID to
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work properly. The default group is "hlfs". If no group is provided,
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and there is no group "hlfs", this feature is disabled.
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.TP
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.B \-h
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Help. Print a brief help message, and exit.
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.TP
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.BI \-i " reload-interval"
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Map-reloading interval. Each
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.I reload-interval
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seconds,
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.B hlfsd
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will reload the password map.
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.B Hlfsd
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needs the password map for the UIDs and home directory pathnames.
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.B Hlfsd
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schedules a SIGALRM to reload the password maps. A SIGHUP sent to
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.B hlfsd
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will force it to reload the maps immediately. The default
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value for
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.I reload-interval
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is 900 seconds (15 minutes.)
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.TP
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.BI \-l " logfile"
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Specify a log file to which
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.B hlfsd
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will record events. If
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.I logfile
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is the string
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.B syslog
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then the log messages will be sent to the system log daemon by
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.IR syslog (3),
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using the LOG_DAEMON facility.
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This is also the default.
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.TP
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.B \-n
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No verify.
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.B Hlfsd
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will not verify the validity of the symbolic link it will be
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returning, or that the user's home directory contains
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sufficient disk-space for spooling. This can speed up
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.B hlfsd
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at the cost of possibly returning symbolic links to home
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directories which are not currently accessible or are full.
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By default,
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.B hlfsd
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validates the symbolic-link in the background.
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The
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.B \-n
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option overrides the meaning of the
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.B \-c
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option, since no caching is necessary.
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.TP
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.BI \-o " mount-options"
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Mount options. Mount options which
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.B hlfsd
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will use to mount itself on top of
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.I dirname.
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By default,
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.IR mount-options
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is set to "ro". If the system supports symbolic-link caching, default
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options are set to "ro,nocache".
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.TP
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.B \-p
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Print PID.
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Outputs the process-id of
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.B hlfsd
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to standard output where it can be saved into a file.
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.TP
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.B \-v
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Version. Displays version information to standard error.
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.TP
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.BI \-x " log-options"
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Specify run-time logging options. The options are a comma separated
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list chosen from: fatal, error, user, warn, info, map, stats, all.
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.TP
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.BI \-C
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Force
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.B hlfsd
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to run on systems that cannot turn off the NFS attribute-cache. Use of
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this option on those systems is discouraged, as it may result in loss
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or misdelivery of mail. The option is ignored on systems that can turn
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off the attribute-cache.
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.TP
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.BI \-D " log-options"
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Select from a variety of debugging options. Prefixing an
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option with the string
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.B no
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reverses the effect of that option. Options are cumulative.
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The most useful option is
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.BR all .
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Since this option is only used for debugging other options are not
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documented here. A fuller description is available in the program
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source. A SIGUSR1 sent to
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.B hlfsd
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will cause it to dump its internal password map to the file
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.BR /usr/tmp/hlfsd.dump.XXXXXX .
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.TP
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.BI \-P " password-file"
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Read the user-name, user-id, and home directory information from the file
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.I password-file.
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Normally,
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.B hlfsd
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will use
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.IR getpwent (3)
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to read the password database. This option allows you to override the
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default database, and is useful if you want to map users' mail files to a
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directory other than their home directory. Only the username, uid, and
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home-directory fields of the file
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.I password-file
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are read and checked. All other fields are ignored. The file
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.I password-file
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must otherwise be compliant with Unix System 7 colon-delimited format
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.IR passwd (4).
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.SH FILES
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.PD 0
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.TP 5
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.B /hlfs
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directory under which
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.B hlfsd
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mounts itself and manages the symbolic link
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.BR home .
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.TP 5
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.B .hlfsdir
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default sub-directory in the user's home directory, to which the
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.B home
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symbolic link returned by
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.B hlfsd
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points.
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.TP 5
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.B /var/hlfs
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directory to which
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.B home
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symbolic link returned by
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.B hlfsd
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points if it is unable to verify the that
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user's home directory is accessible.
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.SH "SEE ALSO"
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.BR amd (8),
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.BR automount (8),
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.BR cron(8),
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.BR getgrent (3),
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.BR getpwent (3),
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.BR mail(1),
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.BR mnttab (4),
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.BR mount (8),
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.BR mtab (5),
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.BR passwd (4),
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.BR sendmail (8),
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.BR umount (8).
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.LP
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.IR "HLFSD: Delivering Email to Your $HOME" ,
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in
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.IR "Proc. LISA-VII, The 7th Usenix System Administration Conference" ,
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November 1993.
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.SH AUTHORS
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Erez Zadok <ezk@cs.columbia.edu>, Computer Science Department,
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Columbia University, New York City, New York, USA, and
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Alexander Dupuy <dupuy@smarts.com>, System Management ARTS,
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White Plains, New York, USA.
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