1.\" 2.\" Copyright (c) 2004-2005 3.\" Hartmut Brandt. 4.\" All rights reserved. 5.\" Copyright (c) 2001-2003 6.\" Fraunhofer Institute for Open Communication Systems (FhG Fokus). 7.\" All rights reserved. 8.\" 9.\" Author: Harti Brandt <harti@FreeBSD.org> 10.\" 11.\" Redistribution and use in source and binary forms, with or without 12.\" modification, are permitted provided that the following conditions 13.\" are met: 14.\" 1. Redistributions of source code must retain the above copyright 15.\" notice, this list of conditions and the following disclaimer. 16.\" 2. Redistributions in binary form must reproduce the above copyright 17.\" notice, this list of conditions and the following disclaimer in the 18.\" documentation and/or other materials provided with the distribution. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" $Begemot: bsnmp/snmpd/bsnmpd.1,v 1.12 2006/02/27 09:50:03 brandt_h Exp $ 33.\" 34.Dd May 14, 2016 35.Dt BSNMPD 1 36.Os 37.Sh NAME 38.Nm bsnmpd 39.Nd "simple and extensible SNMP daemon" 40.Sh SYNOPSIS 41.Nm 42.Op Fl dh 43.Op Fl c Ar file 44.Op Fl D Ar options 45.Op Fl e Ar file 46.Op Fl I Ar paths 47.Op Fl l Ar prefix 48.Op Fl m Ar variable Ns Op = Ns Ar value 49.Op Fl p Ar file 50.Sh DESCRIPTION 51The 52.Nm 53daemon serves the internet SNMP (Simple Network Management Protocol). 54It is intended to serve only the absolute basic MIBs and implement all other 55MIBs through loadable modules. 56In this way the 57.Nm 58can be used in unexpected ways. 59.Pp 60The options are as follows: 61.Bl -tag -width ".It Fl D Ar options" 62.It Fl d 63Do not daemonize. 64Used for debugging. 65.It Fl h 66Print a short usage message. 67.It Fl c Ar file 68Use 69.Ar file 70as configuration file instead of the standard one. 71.It Fl D Ar options 72Debugging options are specified with a 73.Fl o 74flag followed by a comma separated string of options. 75The following options are available. 76.Bl -tag -width ".It Cm trace Ns Cm = Ns Cm level" 77.It Cm dump 78Dump all sent and received PDUs to the terminal. 79.It Cm events 80Set the debugging level of the event library (see 81.Xr eventlib 3 ) 82to 10. 83.It Cm trace Ns Cm = Ns Cm level 84Set the snmp library trace flag to the specified 85value. 86.El 87The value can be specified in the usual C-syntax for numbers. 88.It Fl e Ar file 89Specify an alternate file where the agent's engine id and number of boots 90are saved. 91.It Fl I Ar paths 92Specify a colon separated list of directories to search for configuration 93include files. 94The default is 95.Pa /etc:/usr/etc/:/usr/local/etc . 96These paths are only searched for include specified within <> parentheses. 97.It Fl l Ar prefix 98Use 99.Ar prefix 100as the default basename for the pid and the configuration files. 101.It Fl m Ar variable Ns Op = Ns Ar value 102Define a configuration variable. 103.It Fl p Ar file 104Specify an alternate pid file instead of the default one. 105.El 106.Sh CONFIGURATION 107.Nm 108reads its configuration from either the default or the user specified 109configuration file. 110The configuration file consists of the following types of lines: 111.Bl -bullet -offset indent 112.It 113variable assignments 114.It 115section separators 116.It 117include directives 118.It 119MIB variable assignments 120.El 121.Pp 122If a line is too long it can be continued on the next line by ending it with 123a backslash. 124Empty lines and lines in which the first non-blank character is a 125.Dq # 126sign are ignored. 127.Pp 128All MIB variable assignments of the entire configuration (including nested 129configuration files) are handled as one transaction, i.e., as if they arrived 130in a single SET PDU. 131Any failure during the initial configuration read causes 132.Nm 133to exit. 134A failure during the configuration read caused by a module load 135causes the loading of the module to fail. 136.Pp 137The configuration is read during initialization of 138.Nm , 139when a module is loaded and when 140.Nm 141receives a SIGHUP. 142.Ss VARIABLE ASSIGNMENTS 143Variable assignments can take one of two forms: 144.Bd -unfilled -offset indent 145variable := string 146variable ?= string 147.Ed 148.Pp 149The string reaches from the first non-blank character after the 150equal sign until the first new line or 151.Dq # 152character. 153In the first case 154the string is assigned to the variable unconditionally, in the second case the 155variable is only assigned if it does not exist yet. 156.Pp 157Variable names must begin with a letter or underscore and contain only letters, 158digits or underscores. 159.Ss SECTION SEPARATORS 160The configuration consists of named sections. 161The MIB variable assignments in the section named 162.Dq snmpd 163are executed only during initial setup or when 164.Nm 165receives a SIGHUP. 166All other sections are executed when either a module 167with the same name as the section is loaded or 168.Nm 169receives a SIGHUP and that module is already loaded. 170The default section at the start of the configuration is 171.Dq snmpd . 172One can switch to another section with the syntax 173.Bd -unfilled -offset indent 174%secname 175.Ed 176.Pp 177Where 178.Ar secname 179is the name of the section. 180The same 181.Ar secname 182can be used in more than one place in the configuration. 183All of these parts are collected into one section. 184.Ss INCLUDE DIRECTIVES 185Another configuration file can be included into the current one with the 186include directive that takes one of two forms: 187.Bd -unfilled -offset indent 188\&.include "file" 189\&.include <"file"> 190.Ed 191.Pp 192The first form causes the file to be searched in the current directory, the 193second form causes the file to be searched in the directories specified in 194the system include path. 195Nesting depth is only restricted by available memory. 196.Ss MIB VARIABLE ASSIGNMENTS 197A MIB variable is assigned with the syntax 198.Bd -unfilled -offset indent 199oid [ suboids ] = value 200.Ed 201.Pp 202.Va oid 203is the name of the variable to be set. 204Only the last component of the entire name is used here. 205If the variable is a scalar, the index (.0) is automatically 206appended and need not to be specified. 207If the variable is a table column, the index 208.Pq Va suboids 209must be specified. 210The index consist of elements each separated from the 211previous one by a dot. 212Elements may be either numbers, strings or hostnames 213enclosed in [] brackets. 214If the element is a number it is appended 215to the current oid. 216If the element is a string, its length and the 217.Tn ASCII 218code of each of its characters are appended to the current oid. 219If the 220element is a hostname, the IP address of the host is looked up and the four 221elements of the IP address are appended to the oid. 222.Pp 223For example, an oid of 224.Bd -unfilled -offset indent 225myvariable.27.foooll.[localhost]."&^!" 226.Ed 227.Pp 228results in the oid 229.Bd -unfilled -offset indent 230myvariable.27.102.111.111.111.108.108.127.0.0.1.38.94.33 231.Ed 232.Pp 233The value of the assignment may be either empty, a string or a number. 234If a string starts with a letter or an underscore and consists only of 235letters, digits, underscores and minus signs, it can be written without 236quotes. 237In all other cases the string must be enclosed in double quotes. 238.Sh SUBSTITUTIONS 239A variable substitution is written as 240.Bd -unfilled -offset indent 241$(variable) 242.Ed 243.Pp 244where 245.Ar variable 246is the name of the variable to substitute. 247Using an undefined variable is considered an error. 248.Sh FILES 249.Bl -tag -width ".It Pa /var/run/ Ns Ao Ar prefix Ac Ns \&.pid" -compact 250.It Pa /etc/ Ns Ao Ar prefix Ac Ns \&.config 251Default configuration file, where the default 252.Aq prefix 253is 254.Dq snmpd . 255.It Pa /var/ Ns Ao Ar prefix Ac Ns \&.engine 256Default engine id file. 257.It Pa /var/run/ Ns Ao Ar prefix Ac Ns \&.pid 258Default pid file. 259.It Pa /etc:/usr/etc/:/usr/local/etc 260Default search path for system include files. 261.It Pa @MIBSPATH@FOKUS-MIB.txt 262.It Pa @MIBSPATH@BEGEMOT-MIB.txt 263.It Pa @MIBSPATH@BEGEMOT-SNMPD.txt 264Definitions for the MIBs implemented in the daemon. 265.It Pa /etc/hosts.allow, /etc/hosts.deny 266Access controls that should be enforced by TCP wrappers are defined here. 267Further details are described in 268.Xr hosts_access 5 . 269.El 270.Sh SEE ALSO 271.Xr gensnmptree 1 , 272.Xr hosts_access 5 273.Sh STANDARDS 274The 275.Nm 276conforms to the applicable IETF RFCs. 277.Sh AUTHORS 278.An Hartmut Brandt Aq harti@FreeBSD.org 279.Sh BUGS 280Sure. 281