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bsnmpd - simple and extensible SNMP daemon



      bsnmpd - simple and extensible SNMP daemon


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


      The bsnmpd daemon server 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          This option is used for debugging bsnmpd and causes it not to
                  daemonize itself.
      -h          This option prints a short usage message.
      -c file     Use file as configuration file instead of the standard one.
      -D options  Debugging options are specified with a -o flag followed by a
                  comma separated string of options.  The following options are
                  dump         This option causes all sent and received PDUs to
                               be dumped to the terminal.
                  events       This causes the debugging level of the event
                               library (see eventlib(3)) to be set to 10.
                  trace=level  This option causes the snmp library trace flag
                               to be set to the specified value.  The value can
                               be specified in the usual C-syntax for numbers.
      -I paths    This option specifies 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   The prefix is used as the default basename for the pid and
                  the configuration files.
      -m variable[=value]
                  Define a configuration variable.
      -p file     Specify an alternate pid file instead of the default one.


      The bsnmpd reads its configuration from either the default or the user
      specified configuration file.  The configuration file consists of the
      following 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 a 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.
                             This is the default search path for system include
                             The definitions for the MIBs implemented in the
      /etc/hosts.allow, /etc/hosts.deny
                             Access controls that should be enforced by TCP
                             wrappers should be 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 〈〉




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