syslogd man page on FreeBSD

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

NAME
     syslogd — log systems messages

SYNOPSIS
     syslogd [-468ACcdknosuv] [-a allowed_peer] [-b bind_address]
	     [-f config_file] [-l [mode:]path] [-m mark_interval]
	     [-P pid_file] [-p log_socket]

DESCRIPTION
     The syslogd utility 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:

     -4	     Force syslogd to use IPv4 addresses only.

     -6	     Force syslogd to use IPv6 addresses only.

     -8	     Tells syslogd not to interfere with 8-bit data.  Normally syslogd
	     will replace C1 control characters (ISO 8859 and Unicode
	     characters) with their “M-x” equivalent.  Note, this option does
	     not change the way syslogd alters control characters (see
	     iscntrl(3)).  They will always be replaced with their “^x” equiv‐
	     alent.

     -A	     Ordinarily, syslogd tries to send the message to only one address
	     even if the host has more than one A or AAAA record.  If this
	     option is specified, syslogd tries to send the message to all
	     addresses.

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

	     The allowed_peer option may 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.
					 ipaddr can be also IPv6 address by
					 enclosing the address with ‘[’ and
					 ‘]’.  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’.  If
					 ipaddr is IPv4 address, 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, respectively,
					 or by 24 otherwise.  If ipaddr is
					 IPv6 address, a missing masklen will
					 be substituted by 128.

	     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.

	     The -a options are ignored if the -s option is also specified.

     -b bind_address
	     Specify one specific IP address or hostname to bind to.  If a
	     hostname is specified, the IPv4 or IPv6 address which corresponds
	     to it is used.

     -C	     Create log files that do not exist (permission is set to 0600).

     -c	     Disable the compression of repeated instances of the same line
	     into a single line of the form “last message repeated N times”
	     when the output is a pipe to another program.  If specified
	     twice, disable this compression in all cases.

     -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
	     default 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 default
	     is 20 minutes.

     -n	     Disable dns query for every request.

     -o	     Prefix kernel messages with the full kernel boot file as deter‐
	     mined by getbootfile(3).  Without this, the kernel message prefix
	     is always “kernel:”.

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

     -P	     Specify an alternative file in which to store the process ID.
	     The default is /var/run/syslog.pid.

     -S	     Specify the pathname of an alternate log socket for privileged
	     applications to be used instead; the default is /var/run/logpriv.

     -l	     Specify a location where syslogd should place an additional log
	     socket.  The primary use for this is to place additional log
	     sockets in /var/run/log of various chroot filespaces.  File per‐
	     missions for socket can be specified in octal representation
	     before socket name, delimited with a colon.  Path to socket loca‐
	     tion must be absolute.

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

     -T	     Always use the local time and date for messages received from the
	     network, instead of the timestamp field supplied in the message
	     by the remote host.  This is useful if some of the originating
	     hosts can't keep time properly or are unable to generate a cor‐
	     rect timestamp.

     -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 utility 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 utility reads messages from the UNIX domain sockets
     /var/run/log and /var/run/logpriv, from an Internet domain socket speci‐
     fied in /etc/services, and from the special device /dev/klog (to read
     kernel messages).

     The syslogd utility creates its process ID file, by default
     /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>.

     For security reasons, syslogd will not append to log files that do not
     exist (unless -C option is specified); therefore, they must be created
     manually before running syslogd.

     The date and time are taken from the received message.  If the format of
     the timestamp field is incorrect, time obtained from the local host is
     used instead.  This can be overriden by the -T flag.

FILES
     /etc/syslog.conf	  configuration file
     /var/run/syslog.pid  default process ID file
     /var/run/log	  name of the UNIX domain datagram log socket
     /var/run/logpriv	  UNIX socket for privileged applications
     /dev/klog		  kernel log device

SEE ALSO
     logger(1), syslog(3), services(5), syslog.conf(5), newsyslog(8)

HISTORY
     The syslogd utility 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 does not 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
     file system.  This may confuse some old binaries so that a symbolic link
     might be used for a transitional period.

BSD				 May 13, 2008				   BSD
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