5fadfc4ce7
stable now at a customer's site. Finally add the ability to syslogd to pipe particular messages through an arbitrary filtering command. Idea stolen from IRIX. This code is courtesy of the interface business GmbH, Dresden. Comment about whether to also merge this into 2.2 or not, please. Reviewed by: (long ago) peter
292 lines
8.1 KiB
Groff
292 lines
8.1 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. 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 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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.\" @(#)syslog.conf.5 8.1 (Berkeley) 6/9/93
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.\"
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.Dd June 9, 1993
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.Dt SYSLOG.CONF 5
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.Os
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.Sh NAME
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.Nm syslog.conf
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.Nd
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.Xr syslogd 8
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configuration file
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.Sh DESCRIPTION
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The
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.Nm syslog.conf
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file is the configuration file for the
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.Xr syslogd 8
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program.
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It consists of
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blocks of lines separated by
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.Em program
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specifications,
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with each line containing two fields: the
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.Em selector
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field which specifies the types of messages and priorities to which the
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line applies, and an
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.Em action
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field which specifies the action to be taken if a message
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.Xr syslogd
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receives matches the selection criteria.
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The
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.Em selector
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field is separated from the
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.Em action
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field by one or more tab characters.
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.Pp
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The
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.Em Selectors
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function
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are encoded as a
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.Em facility ,
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a period (``.''), and a
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.Em level ,
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with no intervening white-space.
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Both the
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.Em facility
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and the
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.Em level
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are case insensitive.
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.Pp
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The
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.Em facility
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describes the part of the system generating the message, and is one of
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the following keywords: auth, authpriv, cron, daemon, kern, lpr, mail,
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mark, news, syslog, user, uucp and local0 through local7.
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These keywords (with the exception of mark) correspond to the
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similar
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.Dq Dv LOG_
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values specified to the
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.Xr openlog 3
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and
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.Xr syslog 3
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library routines.
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.Pp
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The
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.Em level
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describes the severity of the message, and is a keyword from the
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following ordered list (higher to lower): emerg, alert, crit, err,
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warning, notice, info and debug.
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These keywords correspond to the
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similar
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.Pq Dv LOG_
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values specified to the
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.Xr syslog
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library routine.
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.Pp
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Each block of lines is separated from the previous block by a tag. The tag
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is a line beginning with
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.Em #!prog
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or
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.Em !prog
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(the former is for compatibility with the previous syslogd, if one is sharing
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syslog.conf files, for example)
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and each block will be associated with calls to syslog from that specific
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program.
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.Pp
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See
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.Xr syslog 3
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for a further descriptions of both the
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.Em facility
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and
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.Em level
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keywords and their significance. It's preferred that selections be made on
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.Em facility
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rather than
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.Em program ,
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since the latter can easily vary in a networked environment. In some cases,
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though, an appropriate
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.Em facility
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simply doesn't exist (for example,
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.Em ftpd
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logs under LOG_DAEMON along with a myriad other programs).
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.Pp
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If a received message matches the specified
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.Em facility
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and is of the specified
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.Em level
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.Em (or a higher level) ,
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and the first word in the message after the date matches the
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.Em program ,
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the action specified in the
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.Em action
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field will be taken.
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.Pp
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Multiple
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.Em selectors
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may be specified for a single
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.Em action
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by separating them with semicolon (``;'') characters.
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It is important to note, however, that each
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.Em selector
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can modify the ones preceding it.
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.Pp
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Multiple
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.Em facilities
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may be specified for a single
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.Em level
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by separating them with comma (``,'') characters.
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.Pp
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An asterisk (``*'') can be used to specify all
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.Em facilities
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all
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.Em levels
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or all
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.Em programs .
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.Pp
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The special
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.Em facility
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``mark'' receives a message at priority ``info'' every 20 minutes
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(see
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.Xr syslogd 8 ) .
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This is not enabled by a
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.Em facility
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field containing an asterisk.
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.Pp
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The special
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.Em level
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``none'' disables a particular
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.Em facility .
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.Pp
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The
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.Em action
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field of each line specifies the action to be taken when the
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.Em selector
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field selects a message.
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There are five forms:
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.Bl -bullet
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.It
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A pathname (beginning with a leading slash).
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Selected messages are appended to the file.
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.It
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A hostname (preceded by an at (``@'') sign).
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Selected messages are forwarded to the
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.Xr syslogd
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program on the named host.
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.It
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A comma separated list of users.
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Selected messages are written to those users
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if they are logged in.
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.It
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An asterisk.
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Selected messages are written to all logged-in users.
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.It
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A vertical bar (``|''), followed by a command to pipe the selected
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messages to. The command is passed to a
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.Pa /bin/sh
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for evaluation, so usual shell metacharacters or input/output
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redirection can occur. (Note however that redirecting
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.Xr stdio 3
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buffered output from the invoked command can cause additional delays,
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or even lost output data in case a logging subprocess exited with a
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signal.) The command itself runs with
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.Em stdout
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and
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.Em stderr
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redirected to
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.Pa /dev/null .
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Upon receipt of a
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.Dv SIGHUP ,
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.Nm syslogd
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will close the pipe to the process. If the process didn't exit
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voluntarily, it will be send a
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.Dv SIGTERM
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signal after a grace period of up to 40 seconds.
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.Pp
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The command will only be started once data arrive that should be piped
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to it. If it exited later, it will be restarted as necessary.
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.Pp
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Unless the command is a full pipeline, it's probably useful to
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start the command with
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.Em exec
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so that the invoking shell process does not wait for the command to
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cmoplete. Warning: the process is started under the UID invoking
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.Xr syslogd 8 ,
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normally superuser.
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.El
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.Pp
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Blank lines and lines whose first non-blank character is a hash (``#'')
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character are ignored.
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.Sh EXAMPLES
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.Pp
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A configuration file might appear as follows:
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.Bd -literal
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# Log all kernel messages, authentication messages of
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# level notice or higher and anything of level err or
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# higher to the console.
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# Don't log private authentication messages!
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*.err;kern.*;auth.notice;authpriv.none /dev/console
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# Log anything (except mail) of level info or higher.
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# Don't log private authentication messages!
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*.info;mail.none;authpriv.none /var/log/messages
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# The authpriv file has restricted access.
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authpriv.* /var/log/secure
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# Log all the mail messages in one place.
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mail.* /var/log/maillog
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# Everybody gets emergency messages, plus log them on another
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# machine.
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*.emerg *
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*.emerg @arpa.berkeley.edu
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# Root and Eric get alert and higher messages.
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*.alert root,eric
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# Save mail and news errors of level err and higher in a
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# special file.
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uucp,news.crit /var/log/spoolerr
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# Pipe all authentication messages to a filter.
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auth.* |exec /usr/local/sbin/authfilter
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# Save ftpd transactions along with mail and news
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!ftpd
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*.* /var/log/spoolerr
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.Ed
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.Sh FILES
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.Bl -tag -width /etc/syslog.conf -compact
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.It Pa /etc/syslog.conf
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The
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.Xr syslogd 8
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configuration file.
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.El
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.Sh BUGS
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The effects of multiple selectors are sometimes not intuitive.
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For example ``mail.crit,*.err'' will select ``mail'' facility messages at
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the level of ``err'' or higher, not at the level of ``crit'' or higher.
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.Sh SEE ALSO
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.Xr syslog 3 ,
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.Xr syslogd 8
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