Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help

       snmptrapd.conf  -  configuration	file for the Net-SNMP notification re-

       The Net-SNMP notification receiver (trap	daemon)	uses one or more  con-
       figuration  files  to control its operation and how incoming traps (and
       INFORM requests)	should be processed.  This file	 (snmptrapd.conf)  can
       be  located  in one of several locations, as described in the snmp_con-
       fig(5) manual page.

       Previously, snmptrapd would accept all incoming notifications, and  log
       them  automatically  (even  if no explicit configuration	was provided).
       Starting	with release 5.3, access control checks	will be	applied	to in-
       coming notifications. If	snmptrapd is run without a suitable configura-
       tion file (or equivalent	access control settings), then such traps WILL
       NOT be processed.  See the section ACCESS CONTROL for more details.

       As  with	 the agent configuration, the snmptrapd.conf directives	can be
       divided into four distinct groups.

       snmpTrapdAddr [<transport-specifier>:]<transport-address>[,...]
	      defines a	list of	listening addresses, on	which to  receive  in-
	      coming  SNMP notifications.  See the section LISTENING ADDRESSES
	      in the snmpd(8) manual page for more information about the  for-
	      mat of listening addresses.

	      The  default  behaviour is to listen on UDP port 162 on all IPv4

       doNotRetainNotificationLogs yes
	      disables support for the NOTIFICATION-LOG-MIB.  Normally the sn-
	      mptrapd  program keeps a record of the traps received, which can
	      be retrieved by querying the nlmLogTable and nlmLogvariableTable
	      tables.  This directive can be used to suppress this behaviour.

	      See  the	snmptrapd(8)  manual page and the NOTIFICATION-LOG-MIB
	      for details.

       doNotLogTraps yes
	      disables the logging of notifications altogether.	 This is  use-
	      ful  if  the  snmptrapd  application  should only	run traphandle
	      hooks and	should not log traps to	any location.

       doNotFork yes
	      do not fork from the calling shell.

       pidFile PATH
	      defines a	file in	which to store the process ID of the notifica-
	      tion receiver.  By default, this ID is not saved.

       Starting	with release 5.3, it is	necessary to explicitly	specify	who is
       authorised to send traps	and informs to the notification	receiver  (and
       what  types  of processing these	are allowed to trigger).  This uses an
       extension of the	VACM model, used in the	main SNMP agent.

       There are currently three types of processing that can be specified:

	      log    log the details of	the notification - either in a	speci-
		     fied  file, to standard output (or	stderr), or via	syslog
		     (or similar).

		     pass the details of the trap to a specified handler  pro-
		     gram, including embedded perl.

	      net    forward the trap to another notification receiver.

       In  the following directives, TYPES will	be a (comma-separated) list of
       one or more of these tokens.  Most commonly,  this  will	 typically  be
       log,execute,net to cover	any style of processing	for a particular cate-
       gory of notification. But it is perfectly possible (even	desirable)  to
       limit certain notification sources to selected processing only.

       authCommunity   TYPES COMMUNITY	[SOURCE	[OID | -v VIEW ]]
	      authorises  traps	 (and SNMPv2c INFORM requests) with the	speci-
	      fied community to	trigger	the types of  processing  listed.   By
	      default,	this  will allow any notification using	this community
	      to be processed.	The SOURCE field can be	used to	 specify  that
	      the  configuration  should  only apply to	notifications received
	      from particular sources -	see snmpd.conf(5) for more details.

       authUser	  TYPES	[-s MODEL] USER	 [LEVEL	[OID | -v VIEW ]]
	      authorises SNMPv3	notifications with the specified user to trig-
	      ger  the	types of processing listed.  By	default, this will ac-
	      cept authenticated  requests.   (authNoPriv  or  authPriv).  The
	      LEVEL  field  can	be used	to allow unauthenticated notifications
	      (noauth),	or to require encryption (priv), just as for the  SNMP

	      With both	of these directives, the OID (or -v VIEW) field	can be
	      used to retrict this configuration to the	processing of particu-
	      lar notifications.

	      Note:  Unlike  the  VACM	processing described in	RFC 3415, this
		     view is only matched against the snmpTrapOID value	of the
		     incoming  notification.  It is not	applied	to the payload
		     varbinds held within that notification.

       authGroup  TYPES	[-s MODEL] GROUP  [LEVEL [OID |	-v VIEW	]]

       authAccess TYPES	[-s MODEL] GROUP VIEW  [LEVEL [CONTEXT]]

	      authorise	notifications in the specified GROUP (configured using
	      the  group directive) to trigger the types of processing listed.
	      See snmpd.conf(5)	for more details.

       createUser [-e  ENGINEID] username (MD5|SHA) authpassphrase [DES|AES]
	      See the snmpd.conf(5) manual page	for a description  of  how  to
	      create  SNMPv3  users.   This  is	roughly	the same, but the file
	      name changes to snmptrapd.conf from snmpd.conf.

       disableAuthorization yes
	      will disable the above access control checks, and	revert to  the
	      previous behaviour of accepting all incoming notifications.

       format1 FORMAT

       format2 FORMAT
	      specify the format used to display SNMPv1	TRAPs and SNMPv2 noti-
	      fications	respectively.  Note that SNMPv2c and SNMPv3  both  use
	      the same SNMPv2 PDU format.

	      specify the format used for different destinations.  DESTINATION
	      is one of: print,	print1,	print2,	syslog,	syslog1, syslog2, exe-
	      cute,  execute1,	execute2.   print1 is used for printing	SNMPv1
	      traps, print2 is for SNMPv2.  print is used for  both  versions.
	      syslog  is similarly used	when sending traps to syslog, and exe-
	      cute used	when sending traps  to	a  program  such  as  traptoe-

	      The default formats are
	      format  print1  %.4y-%.2m-%.2l  %.2h:%.2j:%.2k  %B  [%b] (via %A
	      [%a]): %N\n\t%W Trap (%q)	Uptime:	%#T\n%v\n
	      format print2 %.4y-%.2m-%.2l %.2h:%.2j:%.2k %B [%b]:\n%v\n
	      format syslog1 %a: %W Trap (%q) Uptime: %#T%#v\n
	      format syslog2 %B	[%b]: Trap %#v\n
	      format execute %B\n%b\n%V\n%v\n

	      See snmptrapd(8) for the layout characters available.

       ignoreAuthFailure yes
	      instructs	the receiver to	ignore authenticationFailure traps.

	      Note:  This currently only affects the logging of	such notifica-
		     tions.   authenticationFailure traps will still be	passed
		     to	trap handler scripts, and forwarded to other notifica-
		     tion  receivers.  This behaviour should not be relied on,
		     as	it is likely to	change in future versions.

       logOption string
	      specifies	where notifications should be  logged  -  to  standard
	      output, standard error, a	specified file or via syslog.  See the
	      section LOGGING OPTIONS in the snmpcmd(1)	manual	page  for  de-

       outputOption string
	      specifies	 various  characteristics of how OIDs and other	values
	      should be	displayed.  See	the section OUTPUT OPTIONS in the snm-
	      pcmd(1) manual page for details.

MySQL Logging
       There  are  two	configuration  variables that work together to control
       when queued traps are logged to the MySQL database.  A  non-zero	 value
       must be specified for sqlSaveInterval to	enable MySQL logging.

       sqlMaxQueue max
	      specifies	 the  maximum number of	traps to queue before a	forced
	      flush to the MySQL database.

       sqlSaveInterval seconds
	      specified	the number of seconds between periodic queue  flushes.
	      A	value of 0 for will disable MySQL logging.

       As  well	 as logging incoming notifications, they can also be forwarded
       on to another notification receiver, or passed to an  external  program
       for specialised processing.

       traphandle OID|default PROGRAM [ARGS ...]
	      invokes  the  specified program (with the	given arguments) when-
	      ever a notification is received that matches the OID token.  For
	      SNMPv2c  and  SNMPv3  notifications, this	token will be compared
	      against the snmpTrapOID value taken from the notification.   For
	      SNMPv1  traps,  the generic and specific trap values and the en-
	      terprise OID will	be converted into the equivalent OID  (follow-
	      ing RFC 2576).

	      Typically,  the OID token	will be	the name (or numeric OID) of a
	      NOTIFICATION-TYPE	object,	and the	specified program will be  in-
	      voked  for  notifications	 that match this OID exactly.  However
	      this token also supports a simple	form  of  wildcard  suffixing.
	      By appending the character '*' to	the OID	token, the correspond-
	      ing program will be invoked for any  notification	 based	within
	      subtree  rooted at the specified OID.  For example, an OID token
	      of .* would match any enterprise  specific  notifica-
	      tion  (including	the  specified	OID  itself).  An OID token of
	      .* would would work in much the same way, but	 would
	      not  match this exact OID	- just notifications that lay strictly
	      below this root.	Note that this syntax does  not	 support  full
	      regular  expressions  or	wildcards  -  an OID token of the form
	      oid.*.subids is not valid.

	      If the OID field is the token default then the program  will  be
	      invoked for any notification not matching	another	(OID specific)
	      traphandle entry.

       Details of the notification are fed to the program via its standard in-
       put.  Note that this will always	use the	SNMPv2-style notification for-
       mat, with SNMPv1	traps being converted as per RFC  2576,	 before	 being
       passed to the program.  The input format	is, if you use the default set
       by the "format execute %B\n%b\n%V\n%v\n", one entry per line:

		     The name of the host that sent the	notification,  as  de-
		     termined by gethostbyaddr(3).

		     The transport address, like
		     "[UDP: []:23456->[]]"

		     A	list  of  variable bindings describing the contents of
		     the notification, one per line.  The first	token on  each
		     line (up until a space) is	the OID	of the varind, and the
		     remainder of the line is its value.  The format  of  both
		     of	these are controlled by	the outputOption directive (or
		     similar configuration).

		     The first OID should always  be  SNMPv2-MIB::sysUpTime.0,
		     and  the second should be SNMPv2-MIB::snmpTrapOID.0.  The
		     remaining lines will contain the  payload	varbind	 list.
		     For  SNMPv1  traps, the final OID will be SNMPv2-MIB::sn-

		     A traptoemail script has been included  in	 the  Net-SNMP
		     package that can be used within a traphandle directive:

		     traphandle	 default /usr/bin/perl /usr/local/bin/traptoe-
		     mail  -s   -f

       forward OID|default DESTINATION
	      forwards	notifications  that match the specified	OID to another
	      receiver listening on DESTINATION.  The  interpretation  of  OID
	      (and default) is the same	as for the traphandle directive).

	      See  the section LISTENING ADDRESSES in the snmpd(8) manual page
	      for more information about the format of listening addresses.

       o      The daemon  blocks  while	 executing  the	 traphandle  commands.
	      (This  should  be	fixed in the future with an appropriate	signal
	      catch and	wait() combination).

       o      All directives listed with a value of "yes"  actually  accept  a
	      range  of	 boolean  values.   These will accept any of 1,	yes or
	      true to enable the corresponding behaviour, or any of 0,	no  or
	      false  to	 disable it.  The default in each case is for the fea-
	      ture to be turned	off, so	these directives  are  typically  only
	      used to enable the appropriate behaviour.


       snmp_config(5),	snmptrapd(8), syslog(8), traptoemail(1), variables(5),

V5.7.3				  13 Mar 2014		     SNMPTRAPD.CONF(5)


Want to link to this manual page? Use this URL:

home | help