273 lines
8.2 KiB
Groff
273 lines
8.2 KiB
Groff
.\"
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.\" Copyright (c) 2004-2005
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.\" Hartmut Brandt.
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.\" All rights reserved.
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.\" Copyright (c) 2001-2003
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.\" Fraunhofer Institute for Open Communication Systems (FhG Fokus).
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.\" All rights reserved.
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.\"
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.\" Author: Harti Brandt <harti@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Begemot: bsnmp/snmpd/bsnmpd.1,v 1.12 2006/02/27 09:50:03 brandt_h Exp $
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.\"
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.Dd October 23, 2010
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.Dt BSNMPD 1
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.Os
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.Sh NAME
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.Nm bsnmpd
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.Nd "simple and extensible SNMP daemon"
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.Sh SYNOPSIS
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.Nm
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.Op Fl dh
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.Op Fl c Ar file
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.Op Fl D Ar options
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.Op Fl I Ar paths
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.Op Fl l Ar prefix
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.Op Fl m Ar variable Ns Op = Ns Ar value
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.Op Fl p Ar file
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.Sh DESCRIPTION
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The
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.Nm
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daemon serves the internet SNMP (Simple Network Management Protocol).
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It is intended to serve only the absolute basic MIBs and implement all other
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MIBs through loadable modules.
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In this way the
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.Nm
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can be used in unexpected ways.
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.Pp
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The options are as follows:
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.Bl -tag -width ".It Fl D Ar options"
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.It Fl d
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Do not daemonize.
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Used for debugging.
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.It Fl h
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Print a short usage message.
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.It Fl c Ar file
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Use
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.Ar file
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as configuration file instead of the standard one.
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.It Fl D Ar options
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Debugging options are specified as a comma separated string.
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The following options are available.
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.Bl -tag -width "trace=level"
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.It Cm dump
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Dump all sent and received PDUs to the terminal.
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.It Cm events
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Set the debugging level of the event library (see
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.Xr eventlib 3 )
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to 10.
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.It Cm trace Ns Cm = Ns Cm level
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Set the snmp library trace flag to the specified
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value.
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The value can be specified in the usual C-syntax for numbers.
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.El
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.It Fl I Ar paths
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Specify a colon separated list of directories to search for configuration
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include files.
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The default is
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.Pa /etc:/usr/etc/:/usr/local/etc .
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These paths are only searched for include specified within <> parentheses.
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.It Fl l Ar prefix
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Use
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.Ar prefix
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as the default basename for the pid and the configuration files.
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.It Fl m Ar variable Ns Op = Ns Ar value
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Define a configuration variable.
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.It Fl p Ar file
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Specify an alternate pid file instead of the default one.
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.El
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.Sh CONFIGURATION
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.Nm
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reads its configuration from either the default or the user specified
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configuration file.
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The configuration file consists of the following types of lines:
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.Bl -bullet -offset indent
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.It
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variable assignments
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.It
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section separators
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.It
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include directives
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.It
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MIB variable assignments
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.El
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.Pp
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If a line is too long it can be continued on the next line by ending it with
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a backslash.
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Empty lines and lines in which the first non-blank character is a
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.Dq #
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sign are ignored.
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.Pp
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All MIB variable assignments of the entire configuration (including nested
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configuration files) are handled as one transaction, i.e., as if they arrived
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in a single SET PDU.
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Any failure during the initial configuration read causes
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.Nm
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to exit.
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A failure during the configuration read caused by a module load
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causes the loading of the module to fail.
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.Pp
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The configuration is read during initialization of
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.Nm ,
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when a module is loaded and when
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.Nm
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receives a SIGHUP.
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.Ss VARIABLE ASSIGNMENTS
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Variable assignments can take one of two forms:
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.Bd -unfilled -offset indent
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variable := string
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variable ?= string
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.Ed
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.Pp
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The string reaches from the first non-blank character after the
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equal sign until the first new line or
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.Dq #
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character.
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In the first case
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the string is assigned to the variable unconditionally, in the second case the
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variable is only assigned if it does not exist yet.
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.Pp
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Variable names must begin with a letter or underscore and contain only letters,
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digits or underscores.
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.Ss SECTION SEPARATORS
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The configuration consists of named sections.
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The MIB variable assignments in the section named
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.Dq snmpd
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are executed only during initial setup or when
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.Nm
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receives a SIGHUP.
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All other sections are executed when either a module
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with the same name as the section is loaded or
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.Nm
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receives a SIGHUP and that module is already loaded.
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The default section at the start of the configuration is
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.Dq snmpd .
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One can switch to another section with the syntax
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.Bd -unfilled -offset indent
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%secname
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.Ed
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.Pp
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Where
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.Ar secname
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is the name of the section.
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The same
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.Ar secname
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can be used in more than one place in the configuration.
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All of these parts are collected into one section.
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.Ss INCLUDE DIRECTIVES
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Another configuration file can be included into the current one with the
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include directive that takes one of two forms:
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.Bd -unfilled -offset indent
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\&.include "file"
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\&.include <"file">
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.Ed
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.Pp
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The first form causes the file to be searched in the current directory, the
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second form causes the file to be searched in the directories specified in
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the system include path.
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Nesting depth is only restricted by available memory.
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.Ss MIB VARIABLE ASSIGNMENTS
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A MIB variable is assigned with the syntax
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.Bd -unfilled -offset indent
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oid [ suboids ] = value
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.Ed
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.Pp
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.Va oid
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is the name of the variable to be set.
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Only the last component of the entire name is used here.
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If the variable is a scalar, the index (.0) is automatically
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appended and need not to be specified.
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If the variable is a table column, the index
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.Pq Va suboids
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must be specified.
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The index consist of elements each separated from the
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previous one by a dot.
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Elements may be either numbers, strings or hostnames
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enclosed in [] brackets.
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If the element is a number it is appended
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to the current oid.
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If the element is a string, its length and the
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.Tn ASCII
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code of each of its characters are appended to the current oid.
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If the
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element is a hostname, the IP address of the host is looked up and the four
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elements of the IP address are appended to the oid.
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.Pp
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For example, an oid of
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.Bd -unfilled -offset indent
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myvariable.27.foooll.[localhost]."&^!"
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.Ed
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.Pp
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results in the oid
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.Bd -unfilled -offset indent
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myvariable.27.6.102.111.111.111.108.108.127.0.0.1.38.94.33
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.Ed
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.Pp
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The value of the assignment may be either empty, a string or a number.
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If a string starts with a letter or an underscore and consists only of
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letters, digits, underscores and minus signs, it can be written without
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quotes.
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In all other cases the string must be enclosed in double quotes.
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.Sh SUBSTITUTIONS
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A variable substitution is written as
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.Bd -unfilled -offset indent
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$(variable)
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.Ed
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.Pp
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where
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.Ar variable
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is the name of the variable to substitute.
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Using an undefined variable is considered an error.
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.Sh FILES
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.Bl -tag -width ".It Pa /var/run/ Ns Ao Ar prefix Ac Ns \&.pid" -compact
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.It Pa /etc/ Ns Ao Ar prefix Ac Ns \&.config
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Default configuration file, where the default
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.Aq prefix
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is
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.Dq snmpd .
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.It Pa /var/run/ Ns Ao Ar prefix Ac Ns \&.pid
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Default pid file.
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.It Pa /etc:/usr/etc/:/usr/local/etc
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Default search path for system include files.
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.It Pa @MIBSPATH@FOKUS-MIB.txt
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.It Pa @MIBSPATH@BEGEMOT-MIB.txt
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.It Pa @MIBSPATH@BEGEMOT-SNMPD.txt
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Definitions for the MIBs implemented in the daemon.
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.It Pa /etc/hosts.allow, /etc/hosts.deny
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Access controls that should be enforced by TCP wrappers are defined here.
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Further details are described in
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.Xr hosts_access 5 .
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.El
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.Sh SEE ALSO
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.Xr gensnmptree 1 ,
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.Xr hosts_access 5
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.Sh STANDARDS
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The
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.Nm
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conforms to the applicable IETF RFCs.
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.Sh AUTHORS
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.An Hartmut Brandt Aq harti@FreeBSD.org
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.Sh BUGS
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Sure.
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