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BSNMPD(1)		  BSD General Commands Manual		     BSNMPD(1)

     bsnmpd — simple and extensible SNMP daemon

     bsnmpd [-dh] [-c file] [-D options] [-I paths] [-l prefix]
	    [-m variable[=value]] [-p file]

     The bsnmpd daemon serves the internet SNMP (Simple Network Management
     Protocol).	 It is intended to serve only the absolute basic MIBs and
     implement all other MIBs through loadable modules.	 In this way the
     bsnmpd can be used in unexpected ways.

     The options are as follows:

     -d		 Do not daemonize.  Used for debugging.

     -h		 Print a short usage message.

     -c file	 Use file as configuration file instead of the standard one.

     -D options	 Debugging options are specified as a comma separated string.
		 The following options are available.

		 dump	      Dump all sent and received PDUs to the terminal.

		 events	      Set the debugging level of the event library
			      (see eventlib(3)) to 10.

		 trace=level  Set the snmp library trace flag to the specified
			      value.  The value can be specified in the usual
			      C-syntax for numbers.

     -I paths	 Specify a colon separated list of directories to search for
		 configuration include files.  The default is
		 /etc:/usr/etc/:/usr/local/etc.	 These paths are only searched
		 for include specified within <> parentheses.

     -l prefix	 Use prefix as the default basename for the pid and the con‐
		 figuration files.

     -m variable[=value]
		 Define a configuration variable.

     -p file	 Specify an alternate pid file instead of the default one.

     bsnmpd reads its configuration from either the default or the user speci‐
     fied configuration file.  The configuration file consists of the follow‐
     ing types of lines:

	   ·   variable assignments

	   ·   section separators

	   ·   include directives

	   ·   MIB variable assignments

     If a line is too long it can be continued on the next line by ending it
     with a backslash.	Empty lines and lines in which the first non-blank
     character is a “#” sign are ignored.

     All MIB variable assignments of the entire configuration (including
     nested configuration files) are handled as one transaction, i.e., as if
     they arrived in a single SET PDU.	Any failure during the initial config‐
     uration read causes bsnmpd to exit.  A failure during the configuration
     read caused by a module load causes the loading of the module to fail.

     The configuration is read during initialization of bsnmpd, when a module
     is loaded and when bsnmpd receives a SIGHUP.

     Variable assignments can take one of two forms:

	   variable := string
	   variable ?= string

     The string reaches from the first non-blank character after the equal
     sign until the first new line or “#” character.  In the first case the
     string is assigned to the variable unconditionally, in the second case
     the variable is only assigned if it does not exist yet.

     Variable names must begin with a letter or underscore and contain only
     letters, digits or underscores.

     The configuration consists of named sections.  The MIB variable assign‐
     ments in the section named “snmpd” are executed only during initial setup
     or when bsnmpd receives a SIGHUP.	All other sections are executed when
     either a module with the same name as the section is loaded or bsnmpd
     receives a SIGHUP and that module is already loaded.  The default section
     at the start of the configuration is “snmpd”.  One can switch to another
     section with the syntax


     Where secname is the name of the section.	The same secname can be used
     in more than one place in the configuration.  All of these parts are col‐
     lected into one section.

     Another configuration file can be included into the current one with the
     include directive that takes one of two forms:

	   .include "file"
	   .include <"file">

     The first form causes the file to be searched in the current directory,
     the second form causes the file to be searched in the directories speci‐
     fied in the system include path.  Nesting depth is only restricted by
     available memory.

     A MIB variable is assigned with the syntax

	   oid [ suboids ] = value

     oid is the name of the variable to be set.	 Only the last component of
     the entire name is used here.  If the variable is a scalar, the index
     (.0) is automatically appended and need not to be specified.  If the
     variable is a table column, the index (suboids) must be specified.	 The
     index consist of elements each separated from the previous one by a dot.
     Elements may be either numbers, strings or hostnames enclosed in []
     brackets.	If the element is a number it is appended to the current oid.
     If the element is a string, its length and the ASCII code of each of its
     characters are appended to the current oid.  If the element is a host‐
     name, the IP address of the host is looked up and the four elements of
     the IP address are appended to the oid.

     For example, an oid of


     results in the oid


     The value of the assignment may be either empty, a string or a number.
     If a string starts with a letter or an underscore and consists only of
     letters, digits, underscores and minus signs, it can be written without
     quotes.  In all other cases the string must be enclosed in double quotes.

     A variable substitution is written as


     where variable is the name of the variable to substitute.	Using an unde‐
     fined variable is considered an error.

     /etc/⟨prefix⟩.config   Default configuration file, where the default
			    ⟨prefix⟩ is “snmpd”.
     /var/run/⟨prefix⟩.pid  Default pid file.
			    Default search path for system include files.
			    Definitions for the MIBs implemented in the dae‐
     /etc/hosts.allow, /etc/hosts.deny
			    Access controls that should be enforced by TCP
			    wrappers are defined here.	Further details are
			    described in hosts_access(5).

     gensnmptree(1), hosts_access(5)

     The bsnmpd conforms to the applicable IETF RFCs.

     Hartmut Brandt ⟨⟩


BSD			       October 23, 2010				   BSD

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