257 lines
8.5 KiB
Groff
257 lines
8.5 KiB
Groff
.\"
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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 of this software and documentation and use in source and
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.\" binary forms, with or without modification, are permitted provided that
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.\" the following conditions are met:
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.\"
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.\" 1. Redistributions of source code or documentation must retain the above
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.\" copyright 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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.\" 3. Neither the name of the Institute nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY FRAUNHOFER FOKUS
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.\" AND ITS CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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.\" FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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.\" FRAUNHOFER FOKUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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.\" OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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.\" LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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.\" NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $Begemot: bsnmp/snmpd/bsnmpd.1,v 1.1 2003/12/03 10:08:33 hbb Exp $
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.\"
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.Dd August 15, 2002
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.Dt SNMPD 1
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.Os
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.Sh NAME
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.Nm snmpd
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.Nd "simple and extendable 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 servers the internet SNMP (Simple Network Managment Protocol).
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It is intended to server only the absolute basic MIBs and implement all other
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MIBs through loadable modules. 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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This option is used for debugging
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.Nm
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and causes it not to daemonize itself.
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.It Fl h
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This option prints 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 with a
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.Fl o
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flag followed by a comma separated string of options.
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The following options are available.
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.Bl -tag -width ".It Cm trace Ns Cm = Ns Cm level"
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.It Cm dump
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This option causes all sent and received PDUs to be dumped to the terminal.
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.It Cm events
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This causes the debugging level of the event library (see
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.Xr eventlib 3 )
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to be set to 10.
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.It Cm trace Ns Cm = Ns Cm level
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This option causes the snmp library trace flag to be set to the specified
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value. 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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This option specifies a colon separated list of directories to search for
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configuration include files. 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 <> parantheses.
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.It Fl l Ar prefix
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The
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.Ar prefix
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is used 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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The
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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. The configuration file consists of the following types of
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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. Empty lines and lines who's 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. Any failure during the initial configuration read causes
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.Nm
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to exit. 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 red during initialisation 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. 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. The MIB variable assignments in
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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. 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. The default section
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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. The same
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.Ar secname
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can be used in more than one place in the configuration. All of these parts are
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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. Nesting depths is only restricted by available
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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. Only the last component of the entire
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name is used here. If the variable is a scalar, the index (.0) is automatically
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appended and need not to be specified. If the variable is a table column,
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the index (
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.Va suboids )
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must be specified. The index consist of elements each seperated from the
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previous one by a dot. Elements may be either numbers, strings or hostnames
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enclosed in [] brackets. If the element is a number it is appended
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to the current oid. 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. 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 a 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. 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. Using an undefined variable is
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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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This is the default search path for system include files.
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.It Pa /usr/local/share/snmp/mibs/FOKUS-MIB.txt
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.It Pa /usr/local/share/snmp/mibs/BEGEMOT-MIB.txt
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.It Pa /usr/local/share/snmp/mibs/BEGEMOT-SNMPD.txt
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The definitions for the MIBs implemented in the daemon.
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.El
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.Sh SEE ALSO
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.Xr gensnmptree 1
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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 brandt@fokus.gmd.de
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.Sh BUGS
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Sure.
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