SNMP(3) User Contributed Perl Documentation SNMP(3)NAMESNMP - The Perl5 'SNMP' Extension Module for the Net-SNMP SNMP package.
SYNOPSIS
use SNMP;
...
$sess = new SNMP::Session(DestHost => localhost, Community => public);
$val = $sess->get('sysDescr.0');
...
$vars = new SNMP::VarList([sysDescr,0], [sysContact,0], [sysLocation,0]);
@vals = $sess->get($vars);
...
$vb = new SNMP::Varbind();
do {
$val = $sess->getnext($vb);
print "@{$vb}\n";
} until ($sess->{ErrorNum});
...
$SNMP::save_descriptions = 1;
SNMP::initMib(); # assuming mib is not already loaded
print "$SNMP::MIB{sysDescr}{description}\n";
DESCRIPTION
Note: The perl SNMP 5.0 module which comes with net-snmp 5.0 and higher
is different than previous versions in a number of ways. Most
importantly, it behaves like a proper net-snmp application and calls
init_snmp properly, which means it will read configuration files and
use those defaults where appropriate automatically parse MIB files,
etc. This will likely affect your perl applications if you have, for
instance, default values set up in your snmp.conf file (as the perl
module will now make use of those defaults). The documentation,
however, has sadly not been updated yet (aside from this note), nor is
the read_config default usage implementation fully complete.
The basic operations of the SNMP protocol are provided by this module
through an object oriented interface for modularity and ease of use.
The primary class is SNMP::Session which encapsulates the persistent
aspects of a connection between the management application and the
managed agent. Internally the class is implemented as a blessed hash
reference. This class supplies 'get', 'getnext', 'set', 'fget', and
'fgetnext' method calls. The methods take a variety of input argument
formats and support both synchronous and asynchronous operation through
a polymorphic API (i.e., method behaviour varies dependent on args
passed - see below).
SNMP::Session
$sess = new SNMP::Session(DestHost => 'host', ...)
The following arguments may be passed to new as a hash.
Basic Options
DestHost
Hostname or IP address of the SNMP agent you want to talk to.
Specified in Net-SNMP formatted agent addresses. These addresses
typically look like one of the following:
localhost
tcp:localhost
tls:localhost
tls:localhost:9876
udp6:[::1]:9876
unix:/some/path/to/file/socket
Defaults to 'localhost'.
Version
SNMP version to use.
The default is taken from library configuration - probably 3 [1, 2
(same as 2c), 2c, 3].
Timeout
The number of micro-seconds to wait before resending a request.
The default is '1000000'
Retries
The number of times to retry a request.
The default is '5'
RetryNoSuch
If enabled NOSUCH errors in 'get' pdus will be repaired, removing
the varbind in error, and resent - undef will be returned for all
NOSUCH varbinds, when set to '0' this feature is disabled and the
entire get request will fail on any NOSUCH error (applies to v1
only)
The default is '0'.
SNMPv3/TLS Options
OurIdentity
Our X.509 identity to use, which should either be a fingerprint or
the filename that holds the certificate.
TheirIdentity
The remote server's identity to connect to, specified as eihter a
fingerprint or a file name. Either this must be specified, or the
hostname below along with a trust anchor.
TheirHostname
The remote server's hostname that is expected. If their
certificate was signed by a CA then their hostname presented in the
certificate must match this value or the connection fails to be
established (to avoid man-in-the-middle attacks).
TrustCert
A trusted certificate to use a trust anchor (like a CA certificate)
for verifying a remote server's certificate. If a CA certificate
is used to validate a certificate then the TheirHostname parameter
must also be specified to ensure their presente hostname in the
certificate matches.
SNMPv3/USM Options
SecName
The SNMPv3 security name to use (most for SNMPv3 with USM).
The default is 'initial'.
SecLevel
The SNMPv3 security level to use [noAuthNoPriv, authNoPriv,
authPriv] (v3)
The default is 'noAuthNoPriv'.
SecEngineId
The SNMPv3 security engineID to use (if the snmpv3 security model
needs it; for example USM).
The default is <none>, security engineID and it will be probed if
not supplied (v3)
ContextEngineId
The SNMPv3 context engineID to use.
The default is the <none> and will be set either to the SecEngineId
value if set or discovered or will be discovered in other ways if
using TLS (RFC5343 based discovery).
Context
The SNMPv3 context name to use.
The default is '' (an empty string)
AuthProto
The SNMPv3/USM authentication protocol to use [MD5, SHA].
The default is 'MD5'.
AuthPass
The SNMPv3/USM authentication passphrase to use.
default <none>, authentication passphrase
PrivProto
The SNMPv3/USM privacy protocol to use [DES, AES].
The default is 'DES'.
PrivPass
The SNMPv3/USM privacy passphrase to use.
default <none>, privacy passphrase (v3)
AuthMasterKey
PrivMasterKey
AuthLocalizedKey
PrivLocalizedKey
Directly specified SNMPv3 USM user keys (used if you want to
specify the keys instead of deriving them from a password as
above).
SNMPv1 and SNMPv2c Options
Community
For SNMPv1 and SNMPv2c, the clear-text community name to use.
The default is 'public'.
Other Configuration Options
VarFormats
default 'undef', used by 'fget[next]', holds an hash reference of
output value formatters, (e.g., {<obj> => <sub-ref>, ... }, <obj>
must match the <obj> and format used in the get operation. A
special <obj>, '*', may be used to apply all <obj>s, the supplied
sub is called to translate the value to a new format. The sub is
called passing the Varbind as the arg
TypeFormats
default 'undef', used by 'fget[next]', holds an hash reference of
output value formatters, (e.g., {<type> => <sub-ref>, ... }, the
supplied sub is called to translate the value to a new format,
unless a VarFormat mathces first (e.g.,
$sess->{TypeFormats}{INTEGER} = \&mapEnum(); although this can be
done more efficiently by enabling $SNMP::use_enums or session
creation param 'UseEnums')
UseLongNames
defaults to the value of SNMP::use_long_names at time of session
creation. set to non-zero to have <tags> for 'getnext' methods
generated preferring longer Mib name convention (e.g.,
system.sysDescr vs just sysDescr)
UseSprintValue
defaults to the value of SNMP::use_sprint_value at time of session
creation. set to non-zero to have return values for 'get' and
'getnext' methods formatted with the libraries snprint_value
function. This will result in certain data types being returned in
non-canonical format Note: values returned with this option set may
not be appropriate for 'set' operations (see discussion of value
formats in <vars> description section)
UseEnums
defaults to the value of SNMP::use_enums at time of session
creation. set to non-zero to have integer return values converted
to enumeration identifiers if possible, these values will also be
acceptable when supplied to 'set' operations
UseNumeric
defaults to the value of SNMP::use_numeric at time of session
creation. set to non-zero to have <tags> for get methods returned
as numeric OID's rather than descriptions. UseLongNames will be
set so that the full OID is returned to the caller.
BestGuess
defaults to the value of SNMP::best_guess at time of session
creation. this setting controls how <tags> are parsed. setting to
0 causes a regular lookup. setting to 1 causes a regular
expression match (defined as -Ib in snmpcmd) and setting to 2
causes a random access lookup (defined as -IR in snmpcmd).
NonIncreasing
defaults to the value of SNMP::non_increasing at time of session
creation. this setting controls if a non-increasing OID during
bulkwalk will causes an error. setting to 0 causes the default
behaviour (which may, in very badly performing agents, result in a
never-ending loop). setting to 1 causes an error (OID not
increasing) when this error occur.
ErrorStr
read-only, holds the error message assoc. w/ last request
ErrorNum
read-only, holds the snmp_err or staus of last request
ErrorInd
read-only, holds the snmp_err_index when appropriate
Private variables:
DestAddr
internal field used to hold the translated DestHost field
SessPtr
internal field used to cache a created session structure
RemotePort
Obsolete. Please use the DestHost specifier to indicate the
hostname and port combination instead of this paramet.
SNMP::Session methods
$sess->update(<fields>)
Updates the SNMP::Session object with the values fields passed in
as a hash list (similar to new(<fields>)) (WARNING! not fully
implemented)
$sess->get(<vars> [,<callback>])
do SNMP GET, multiple <vars> formats accepted. for syncronous
operation <vars> will be updated with value(s) and type(s) and will
also return retrieved value(s). If <callback> supplied method will
operate asynchronously
$sess->fget(<vars> [,<callback>])
do SNMP GET like 'get' and format the values according the handlers
specified in $sess->{VarFormats} and $sess->{TypeFormats}
$sess->getnext(<vars> [,<callback>])
do SNMP GETNEXT, multiple <vars> formats accepted, returns
retrieved value(s), <vars> passed as arguments are updated to
indicate next lexicographical <obj>,<iid>,<val>, and <type>
Note: simple string <vars>,(e.g., 'sysDescr.0') form is not
updated. If <callback> supplied method will operate asynchronously
$sess->fgetnext(<vars> [,<callback>])
do SNMP GETNEXT like getnext and format the values according the
handlers specified in $sess->{VarFormats} and $sess->{TypeFormats}
$sess->set(<vars> [,<callback>])
do SNMP SET, multiple <vars> formats accepted. the value field in
all <vars> formats must be in a canonical format (i.e., well known
format) to ensure unambiguous translation to SNMP MIB data value
(see discussion of canonical value format <vars> description
section), returns snmp_errno. If <callback> supplied method will
operate asynchronously
$sess->getbulk(<non-repeaters>, <max-repeaters>, <vars>)
do an SNMP GETBULK, from the list of Varbinds, the single next
lexico instance is fetched for the first n Varbinds as defined by
<non-repeaters>. For remaining Varbinds, the m lexico instances are
retrieved each of the remaining Varbinds, where m is
<max-repeaters>.
$sess->bulkwalk(<non-repeaters>, <max-repeaters>, <vars> [,<callback>])
Do a "bulkwalk" of the list of Varbinds. This is done by sending a
GETBULK request (see getbulk() above) for the Varbinds. For each
requested variable, the response is examined to see if the next
lexico instance has left the requested sub-tree. Any further
instances returned for this variable are ignored, and the walk for
that sub-tree is considered complete.
If any sub-trees were not completed when the end of the responses
is reached, another request is composed, consisting of the
remaining variables. This process is repeated until all sub-trees
have been completed, or too many packets have been exchanged (to
avoid loops).
The bulkwalk() method returns an array containing an array of
Varbinds, one for each requested variable, in the order of the
variable requests. Upon error, bulkwalk() returns undef and sets
$sess->ErrorStr and $sess->ErrorNum. If a callback is supplied,
bulkwalk() returns the SNMP request id, and returns immediately.
The callback will be called with the supplied argument list and the
returned variables list.
Note: Because the client must "discover" that the tree is complete
by comparing the returned variables with those that were requested,
there is a potential "gotcha" when using the max-repeaters value.
Consider the following code to print a list of interfaces and byte
counts:
$numInts = $sess->get('ifNumber.0');
($desc, $in, $out) = $sess->bulkwalk(0, $numInts,
[['ifDescr'], ['ifInOctets'], ['ifOutOctets']]);
for $i (0..($numInts - 1)) {
printf "Interface %4s: %s inOctets, %s outOctets\n",
$$desc[$i]->val, $$in[$i]->val, $$out[$i]->val;
}
This code will produce *two* requests to the agent -- the first to
get the interface values, and the second to discover that all the
information was in the first packet. To get around this, use
'$numInts + 1' for the max_repeaters value. This asks the agent to
include one additional (unrelated) variable that signals the end of
the sub-tree, allowing bulkwalk() to determine that the request is
complete.
$results = $sess->gettable(<TABLE OID>, <OPTIONgt)
This will retrieve an entire table of data and return a hash
reference to that data. The returned hash reference will have
indexes of the OID suffixes for the index data as the key. The
value for each entry will be another hash containing the data for a
given row. The keys to that hash will be the column names, and the
values will be the data.
Example:
#!/usr/bin/perl
use SNMP;
use Data::Dumper;
my $s = new SNMP::Session(DestHost => 'localhost');
print Dumper($s->gettable('ifTable'));
On my machine produces:
$VAR1 = {
'6' => {
'ifMtu' => '1500',
'ifPhysAddress' => 'PV',
# ...
'ifInUnknownProtos' => '0'
},
'4' => {
'ifMtu' => '1480',
'ifPhysAddress' => '',
# ...
'ifInUnknownProtos' => '0'
},
# ...
};
By default, it will try to do as optimized retrieval as possible.
It'll request multiple columns at once, and use GETBULK if
possible. A few options may be specified by passing in an OPTIONS
hash containing various parameters:
noindexes => 1
Instructs the code not to parse the indexes and place the
results in the second hash. If you don't need the index data,
this will be faster.
columns => [ colname1, ... ]
This specifies which columns to collect. By default, it will
try to collect all the columns defined in the MIB table.
repeat => COUNT
Specifies a GETBULK repeat COUNT. IE, it will request this
many varbinds back per column when using the GETBULK operation.
Shortening this will mean smaller packets which may help going
through some systems. By default, this value is calculated and
attempts to guess at what will fit all the results into 1000
bytes. This calculation is fairly safe, hopefully, but you can
either raise or lower the number using this option if desired.
In lossy networks, you want to make sure that the packets don't
get fragmented and lowering this value is one way to help that.
nogetbulk => 1
Force the use of GETNEXT rather than GETBULK. (always true for
SNMPv1, as it doesn't have GETBULK anyway). Some agents are
great implementers of GETBULK and this allows you to force the
use of GETNEXT operations instead.
callback => \&subroutine
callback => [\&subroutine, optarg1, optarg2, ...]
If a callback is specified, gettable will return quickly
without returning results. When the results are finally
retrieved the callback subroutine will be called (see the other
sections defining callback behaviour and how to make use of
SNMP::MainLoop which is required fro this to work). An
additional argument of the normal hash result will be added to
the callback subroutine arguments.
Note 1: internally, the gettable function uses it's own
callbacks which are passed to getnext/getbulk as appropriate.
Note 2: callback support is only available in the SNMP module
version 5.04 and above. To test for this in code intending to
support both versions prior to 5.04 and 5.04 and up, the
following should work:
if ($response = $sess->gettable('ifTable', callback => \&my_sub)) {
# got a response, gettable doesn't support callback
my_sub($response);
$no_mainloop = 1;
}
Deciding on whether to use SNMP::MainLoop is left as an
exercise to the reader since it depends on whether your code
uses other callbacks as well.
SNMP::TrapSession
$sess = new SNMP::Session(DestHost => 'host', ...)
supports all applicable fields from SNMP::Session (see above)
SNMP::TrapSession methods
$sess->trap(enterprise, agent, generic, specific, uptime, <vars>)
$sess->trap(enterprise=>'.1.3.6.1.4.1.2021', # or 'ucdavis' [default]
agent => '127.0.0.1', # or 'localhost',[dflt 1st intf on host]
generic => specific, # can be omitted if 'specific' supplied
specific => 5, # can be omitted if 'generic' supplied
uptime => 1234, # dflt to localhost uptime (0 on win32)
[[ifIndex, 1, 1],[sysLocation, 0, "here"]]); # optional vars
# always last
trap(oid, uptime, <vars>) - v2 format
$sess->trap(oid => 'snmpRisingAlarm',
uptime => 1234,
[[ifIndex, 1, 1],[sysLocation, 0, "here"]]); # optional vars
# always last
Acceptable variable formats:
<vars> may be one of the following forms:
SNMP::VarList
represents an array of MIB objects to get or set, implemented as a
blessed reference to an array of SNMP::Varbinds, (e.g.,
[<varbind1>, <varbind2>, ...])
SNMP::Varbind
represents a single MIB object to get or set, implemented as a
blessed reference to a 4 element array; [<obj>, <iid>, <val>,
<type>].
<obj>
one of the following forms:
1) leaf identifier (e.g., 'sysDescr') assumed to be unique for
practical purposes
2) fully qualified identifier (e.g.,
'.iso.org.dod.internet.mgmt.mib-2.system.sysDescr')
3) fully qualified, dotted-decimal, numeric OID (e.g.,
'.1.3.6.1.2.1.1.1')
<iid>
the dotted-decimal, instance identifier. for scalar MIB objects
use '0'
<val>
the SNMP data value retrieved from or being set to the agents
MIB. for (f)get(next) operations <val> may have a variety of
formats as determined by session and package settings. However
for set operations the <val> format must be canonical to ensure
unambiguous translation. The canonical forms are as follows:
OBJECTID
dotted-decimal (e.g., .1.3.6.1.2.1.1.1)
OCTETSTR
perl scalar containing octets
INTEGER
decimal signed integer (or enum)
NETADDR
dotted-decimal
IPADDR
dotted-decimal
COUNTER
decimal unsigned integer
COUNTER64
decimal unsigned integer
GAUGE
decimal unsigned integer
UINTEGER
decimal unsigned integer
TICKS
decimal unsigned integer
OPAQUE
perl scalar containing octets
NULL
perl scalar containing nothing
<type>
SNMP data type (see list above), this field is populated by
'get' and 'getnext' operations. In some cases the programmer
needs to populate this field when passing to a 'set' operation.
this field need not be supplied when the attribute indicated by
<tag> is already described by loaded Mib modules. for 'set's,
if a numeric OID is used and the object is not currently in the
loaded Mib, the <type> field must be supplied
simple string
light weight form of <var> used to 'set' or 'get' a single
attribute without constructing an SNMP::Varbind. stored in a perl
scalar, has the form '<tag>.<iid>', (e.g., 'sysDescr.0'). for 'set'
operations the value is passed as a second arg. Note: This argument
form is not updated in get[next] operations as are the other forms.
Acceptable callback formats
<callback> may be one of the following forms:
without arguments
\&subname
sub { ... }
or with arguments
[ \&subname, $arg1, ... ]
[ sub { ... }, $arg1, ... ]
[ "method", $obj, $arg1, ... ]
callback will be called when response is received or timeout occurs.
the last argument passed to callback will be a SNMP::VarList reference.
In case of timeout the last argument will be undef.
&SNMP::MainLoop([<timeout>, [<callback>]])
to be used with async SNMP::Session calls. MainLoop must be called
after initial async calls so return packets from the agent will not
be processed. If no args supplied this function enters an infinite
loop so program must be exited in a callback or externally
interrupted. If <timeout(sic)
&SNMP::finish()
This function, when called from an SNMP::MainLoop() callback
function, will cause the current SNMP::MainLoop() to return after
the callback is completed. finish() can be used to terminate an
otherwise-infinite MainLoop. A new MainLoop() instance can then be
started to handle further requests.
SNMP package variables and functions
$SNMP::VERSION
the current version specifier (e.g., 3.1.0)
$SNMP::auto_init_mib
default '1', set to 0 to disable automatic reading of the MIB upon
session creation. set to non-zero to call initMib at session
creation which will result in MIB loading according to Net-SNMP
env. variables (see man mib_api)
$SNMP::verbose
default '0', controls warning/info output of SNMP module, 0 => no
output, 1 => enables warning/info output from SNMP module itself
(is also controlled by SNMP::debugging - see below)
$SNMP::use_long_names
default '0', set to non-zero to enable the use of longer Mib
identifiers. see translateObj. will also influence the formatting
of <tag> in varbinds returned from 'getnext' operations. Can be set
on a per session basis (UseLongNames)
$SNMP::use_sprint_value
default '0', set to non-zero to enable formatting of response
values using the snmp libraries snprint_value function. can also be
set on a per session basis (see UseSprintValue) Note: returned
values may not be suitable for 'set' operations
$SNMP::use_enums
default '0',set non-zero to return values as enums and allow sets
using enums where appropriate. integer data will still be accepted
for set operations. can also be set on a per session basis (see
UseEnums)
$SNMP::use_numeric
default to '0',set to non-zero to have <tags> for 'get' methods
returned as numeric OID's rather than descriptions. UseLongNames
will be set so that the entire OID will be returned. Set on a per-
session basis (see UseNumeric).
$SNMP::best_guess
default '0'. This setting controls how <tags> are parsed. Setting
to 0 causes a regular lookup. Setting to 1 causes a regular
expression match (defined as -Ib in snmpcmd) and setting to 2
causes a random access lookup (defined as -IR in snmpcmd). Can
also be set on a per session basis (see BestGuess)
$SNMP::save_descriptions
default '0',set non-zero to have mib parser save attribute
descriptions. must be set prior to mib initialization
$SNMP::debugging
default '0', controls debugging output level within SNMP module and
libsnmp
1. enables 'SNMP::verbose' (see above)
2. level 1 plus snmp_set_do_debugging(1)
3. level 2 plus snmp_set_dump_packet(1)
$SNMP::dump_packet
default '0', set [non-]zero to independently set
snmp_set_dump_packet()SNMP::register_debug_tokens()
Allows to register one or more debug tokens, just like the -D
option of snmpd. Each debug token enables a group of debug
statements. An example:
SNMP::register_debug_tokens("tdomain,netsnmp_unix");
%SNMP::MIB
a tied hash to access parsed MIB information. After the MIB has been
loaded this hash allows access to to the parsed in MIB meta-data(the
structure of the MIB (i.e., schema)). The hash returns blessed
references to SNMP::MIB::NODE objects which represent a single MIB
attribute. The nodes can be fetched with multiple 'key' formats - the
leaf name (e.g.,sysDescr) or fully/partially qualified name (e.g.,
system.sysDescr) or fully qualified numeric OID. The returned node
object supports the following fields:
objectID
dotted decimal fully qualified OID
label
leaf textual identifier (e.g., 'sysDescr')
subID
leaf numeric OID component of objectID (e.g., '1')
moduleID
textual identifier for module (e.g., 'RFC1213-MIB')
parent
parent node
children
array reference of children nodes
nextNode
next lexico node (BUG!does not return in lexico order)
type
returns application type (see getType for values)
access
returns ACCESS (ReadOnly, ReadWrite, WriteOnly, NoAccess, Notify,
Create)
status
returns STATUS (Mandatory, Optional, Obsolete, Deprecated)
syntax
returns 'textualConvention' if defined else 'type'
textualConvention
returns TEXTUAL-CONVENTION
TCDescription
returns the TEXTUAL-CONVENTION's DESCRIPTION field.
units
returns UNITS
hint
returns HINT
enums
returns hash ref {tag => num, ...}
ranges
returns array ref of hash ref [{low => num, high => num}, ...]
description
returns DESCRIPTION ($SNMP::save_descriptions must be set prior to
MIB initialization/parsing)
reference
returns the REFERENCE clause
indexes
returns the objects in the INDEX clause
implied
returns true if the last object in the INDEX is IMPLIED
MIB Functions
&SNMP::setMib(<file>)
allows dynamic parsing of the mib and explicit specification of mib
file independent of environment variables. called with no args acts
like initMib, loading MIBs indicated by environment variables (see
Net-SNMP mib_api docs). passing non-zero second arg forces previous
mib to be freed and replaced (Note: second arg not working since
freeing previous Mib is more involved than before).
&SNMP::initMib()
calls library init_mib function if Mib not already loaded - does
nothing if Mib already loaded. will parse directories and load
modules according to environment variables described in Net-SNMP
documentations. (see man mib_api, MIBDIRS, MIBS, MIBFILE(S), etc.)
&SNMP::addMibDirs(<dir>,...)
calls library add_mibdir for each directory supplied. will cause
directory(s) to be added to internal list and made available for
searching in subsequent loadModules calls
&SNMP::addMibFiles(<file>,...)
calls library read_mib function. The file(s) supplied will be read
and all Mib module definitions contained therein will be added to
internal mib tree structure
&SNMP::loadModules(<mod>,...)
calls library read_module function. The module(s) supplied will be
searched for in the current mibdirs and and added to internal mib
tree structure. Passing special <mod>, 'ALL', will cause all known
modules to be loaded.
&SNMP::unloadModules(<mod>,...)
*Not Implemented*
&SNMP::translateObj(<var>[,arg,[arg]])
will convert a text obj tag to an OID and vice-versa. Any iid
suffix is retained numerically. Default behaviour when converting
a numeric OID to text form is to return leaf identifier only
(e.g.,'sysDescr') but when $SNMP::use_long_names is non-zero or a
non-zero second arg is supplied it will return a longer textual
identifier. An optional third argument of non-zero will cause the
module name to be prepended to the text name (e.g.
'SNMPv2-MIB::sysDescr'). When converting a text obj, the
$SNMP::best_guess option is used. If no Mib is loaded when called
and $SNMP::auto_init_mib is enabled then the Mib will be loaded.
Will return 'undef' upon failure.
&SNMP::getType(<var>)
return SNMP data type for given textual identifier OBJECTID,
OCTETSTR, INTEGER, NETADDR, IPADDR, COUNTER GAUGE, TIMETICKS,
OPAQUE, or undef
&SNMP::mapEnum(<var>)
converts integer value to enumertion tag defined in Mib or converts
tag to integer depending on input. the function will return the
corresponding integer value *or* tag for a given MIB attribute and
value. The function will sense which direction to perform the
conversion. Various arg formats are supported
$val = SNMP::mapEnum($varbind);
where $varbind is SNMP::Varbind or equiv. note: $varbind will
be updated
$val = SNMP::mapEnum('ipForwarding', 'forwarding');
$val = SNMP::mapEnum('ipForwarding', 1);
Exported SNMP utility functions
Note: utility functions do not support async operation yet.
&snmp_get()
takes args of SNMP::Session::new followed by those of
SNMP::Session::get
&snmp_getnext()
takes args of SNMP::Session::new followed by those of
SNMP::Session::getnext
&snmp_set()
takes args of SNMP::Session::new followed by those of
SNMP::Session::set
&snmp_trap()
takes args of SNMP::TrapSession::new followed by those of
SNMP::TrapSession::trap
Trouble Shooting
If problems occur there are number areas to look at to narrow down the
possibilities.
The first step should be to test the Net-SNMP installation
independently from the Perl5 SNMP interface.
Try running the apps from the Net-SNMP distribution.
Make sure your agent (snmpd) is running and properly configured with
read-write access for the community you are using.
Ensure that your MIBs are installed and enviroment variables are set
appropriately (see man mib_api)
Be sure to remove old net-snmp installations and ensure headers and
libraries from old CMU installations are not being used by mistake.
If the problem occurs during compilation/linking check that the snmp
library being linked is actually the Net-SNMP library (there have been
name conflicts with existing snmp libs).
Also check that the header files are correct and up to date.
Sometimes compiling the Net-SNMP library with
'position-independent-code' enabled is required (HPUX specifically).
If you cannot resolve the problem you can post to
comp.lang.perl.modules or
net-snmp-users@net-snmp-users@lists.sourceforge.net
please give sufficient information to analyze the problem (OS type,
versions for OS/Perl/Net-SNMP/compiler, complete error output, etc.)
Acknowledgements
Many thanks to all those who supplied patches, suggestions and
feedback.
Joe Marzot (the original author)
Wes Hardaker and the net-snmp-coders
Dave Perkins
Marcel Wiget
David Blackburn
John Stofell
Gary Hayward
Claire Harrison
Achim Bohnet
Doug Kingston
Jacques Vidrine
Carl Jacobsen
Wayne Marquette
Scott Schumate
Michael Slifcak
Srivathsan Srinivasagopalan
Bill Fenner
Jef Peeraer
Daniel Hagerty
Karl "Rat" Schilke and Electric Lightwave, Inc.
Perl5 Porters
Alex Burger
Apologies to any/all who's patch/feature/request was not mentioned or
included - most likely it was lost when paying work intruded on my fun.
Please try again if you do not see a desired feature. This may actually
turn out to be a decent package with such excellent help and the fact
that I have more time to work on it than in the past.
AUTHOR
bugs, comments, questions to net-snmp-users@lists.sourceforge.net
Copyright
Copyright (c) 1995-2000 G. S. Marzot. All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
Copyright (c) 2001-2002 Networks Associates Technology, Inc. All
Rights Reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl
itself.
POD ERRORS
Hey! The above document had some coding errors, which are explained
below:
Around line 1722:
'=item' outside of any '=over'
Around line 1728:
You forgot a '=back' before '=head2'
perl v5.18.1 2012-10-09 SNMP(3)
