SNMP passpersist backend for Net-SNMP
Project description
SNMP-PassPersist
This module is a SNMP passpersist backend for Net-SNMP.
The snmp_passpersist.PassPersist
class present a convenient way to creare a MIB subtree and expose it to snmp via its passpersist protocol.
Two threads are used, one for talking with snmpd and a second that trigger the update process at a fixed interval.
The keyword 'DUMP' has been added to the protocol for testing purpose.
Installation
The easiest way is using pip :
pip install snmp_passpersist
Example
Usage example: in a file /path/to/your/script.py :
#!/usr/bin/python -u
import snmp_passpersist as snmp
def update():
pp.add_int('0.1', 123, "This is a label for this integer")
pp.add_str('0.2', "A string")
pp.add_oct('0.3', '01 00 1f 0b 00 0b') # MAC address as an octet string
pp=snmp.PassPersist(".1.3.6.1.3.53.8")
pp.start(update,30) # Every 30s
With the following line in Net-SNMP's snmpd.conf :
pass_persist .1.3.6.1.3.53.8.0 /path/to/your/script.py
A Real-world example is available here: https://github.com/nagius/cxm/blob/master/misc/snmp_xen.py
List of supported types and their helpers
Type | Helper |
---|---|
Counter32 | add_cnt_32bit() |
Counter64 | add_cnt_64bit() |
GAUGE | add_gau() |
INTEGER | add_int() |
IPADDRESS | add_ip() |
OBJECTID | add_oid() |
OCTET | add_oct() |
STRING | add_str() |
TIMETICKS | add_tt() |
Special helpers
Labels
You can add a label with each entries, as an optional parameter to all add_*() helpers. This label is not used by Net-SNMP and is only useful for debugging with the DUMP keyword.
add_oid()
This helper allow you to add a simple OID string and give it the proper type. For example, calling this method with
pp.add_oid('.1.3.6.1.2.1.47','1.1.1.1.3.1','0.0')
where "0.0" represents SNMPv2-SMI::zeroDotZero
.
This results in the following response when we walk this OID:
ENTITY-MIB::entPhysicalVendorType.1 = OID: SNMPv2-SMI::zeroDotZero
Set an attribute
You can register a helper to allow the recording of value from Net-SNMP.
def my_setter(oid, type, value):
print("Received %s with value %s for oid %s." % (type, value, oid))
return True
pp.register_setter('.1.3.6.1.3.53.8.0.4', my_setter)
Example for debugging :
$ /path/to/your/script.py
set
.1.3.6.1.3.53.8.0.4
INTEGER 987
Received INTEGER with value 987 for oid .1.3.6.1.3.53.8.0.4.
DONE
set
.1.3.6.1.3.53.8.0.1
STRING some-random-useless-string
not-writable
Another example that show the usage of the 'set' feature is available in the 'example/' directory.
Debugging example
Run the previous script in a shell and type the commands :
$ /path/to/your/script.py
PING
PONG
DUMP
{'0.1': {'type': 'INTEGER', 'value': '123'}}
get
.1.3.6.1.3.53.8
NONE
get
.1.3.6.1.3.53.8.0.1
.1.3.6.1.3.53.8.0.1
INTEGER
123
getnext
.1.3.6.1.3.53.8
.1.3.6.1.3.53.8.0.1
INTEGER
123
All commands are typed on two lines : get.1.3.6.1.3.53.8.0.1, except PING and DUMP.
Credits
Many thanks to all contributors.
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