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SYSLOGD(8)		FreeBSD System Manager's Manual 	    SYSLOGD(8)

NAME
     syslogd - log systems messages

SYNOPSIS
     syslogd [-dknsuv] [-a allowed_peer] [-f config_file] [-m mark_interval]
     [-p log_socket] [-l path]

DESCRIPTION
     The syslogd daemon reads and logs messages to the system console, log
     files, other machines and/or users as specified by its configuration
     file.

     The options are as follows:

     -a allowed_peer
	     Allow allowed_peer to log to this syslogd using UDP datagrams.
	     Multiple -a options may be specified.

	     Allowed_peer can be any of the following:

	     ipaddr/masklen[:service]	 Accept datagrams from ipaddr (in the
					 usual dotted quad notation) with
					 masklen bits being taken into account
					 when doing the address comparison.
					 If specified, service is the name or
					 number of an UDP service (see
					 services(5)) the source packet must
					 belong to.  A service of `*' allows
					 packets being sent from any UDP port.
					 The default service is `syslog'. A
					 missing masklen will be substituted
					 by the historic class A or class B
					 netmasks if ipaddr belongs into the
					 address range of class A or B, re­
					 spectively, or by 24 otherwise.

	     domainname[:service]	 Accept datagrams where the reverse
					 address lookup yields domainname for
					 the sender address.  The meaning of
					 service is as explained above.

	     *domainname[:service]	 Same as before, except that any
					 source host whose name ends in
					 domainname will get permission.

     -d      Put syslogd into debugging mode.  This is probably only of use to
	     developers working on syslogd.

     -f      Specify the pathname of an alternate configuration file; the de­
	     fault is /etc/syslog.conf.

     -k      Disable the translation of messages received with facility
	     ``kern'' to facility ``user''. Usually the ``kern'' facility is
	     reserved for messages read directly from /dev/klog.

     -m      Select the number of minutes between ``mark'' messages; the de­
	     fault is 20 minutes.

     -n      Disable dns query for every request.

     -p      Specify the pathname of an alternate log socket to be used in­
	     stead; the default is /var/run/log.

     -l      Specify a location where syslogd should place an additional log
	     socket.  Up to 19 additional logging sockets can be specified.
	     The primary use for this is to place additional log sockets in
	     /var/run/log of various chroot filespaces.

     -s      Operate in secure mode.  Do not log messages from remote ma­
	     chines.  If specified twice, no network socket will be opened at
	     all, which also disables logging to remote machines.

     -u      Unique priority logging.  Only log messages at the specified pri­
	     ority.  Without this option, messages at the stated priority or
	     higher are logged.  This option changes the default comparison
	     from ``=>'' to ``=''.

     -v      Verbose logging.  If specified once, the numeric facility and
	     priority are logged with each locally-written message.  If speci­
	     fied more than once, the names of the facility and priority are
	     logged with each locally-written message.

     The syslogd daemon reads its configuration file when it starts up and
     whenever it receives a hangup signal.  For information on the format of
     the configuration file, see syslog.conf(5).

     The syslogd daemon reads messages from the UNIX domain socket
     /var/run/log, from an Internet domain socket specified in /etc/services,
     and from the special device /dev/klog (to read kernel messages).

     The syslogd daemon creates the file /var/run/syslog.pid, and stores its
     process id there.	This can be used to kill or reconfigure syslogd.

     The message sent to syslogd should consist of a single line.  The message
     can contain a priority code, which should be a preceding decimal number
     in angle braces, for example, `<5.>' This priority code should map into
     the priorities defined in the include file <sys/syslog.h>.

FILES
     /etc/syslog.conf	  configuration file
     /var/run/syslog.pid  process id of current syslogd
     /var/run/log	  name of the UNIX domain datagram log socket
     /dev/klog		  kernel log device

SEE ALSO
     logger(1),  syslog(3),  services(5),  syslog.conf(5)

HISTORY
     The syslogd command appeared in 4.3BSD.

     The -a, -s, -u, and -v options are FreeBSD 2.2 extensions.

BUGS
     The ability to log messages received in UDP packets is equivalent to an
     unauthenticated remote disk-filling service, and should probably be dis­
     abled by default.	Some sort of inter-syslogd authentication mechanism
     ought to be worked out.  To prevent the worst abuse, use of the -a option
     is therefore highly recommended.

     The -a matching algorithm doesn't pretend to be very efficient; use of
     numeric IP addresses is faster than domain name comparison.  Since the
     allowed peer list is being walked linearly, peer groups where frequent
     messages are being anticipated from should be put early into the -a list.

     The log socket was moved from /dev to ease the use of a read-only root
     filesystem.  This may confuse some old binaries so that a symbolic link
     might be used for a transitional period.

4.2 Berkeley Distribution      October 12, 1995 			     2

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | BUGS

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