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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
import sys
from glances.logger import logger
# Import mandatory PySNMP lib
try:
from pysnmp.entity.rfc3413.oneliner import cmdgen
except ImportError:
logger.critical("PySNMP library not found. To install it: pip install pysnmp")
sys.exit(2)
class GlancesSNMPClient(object):
"""SNMP client class (based on pysnmp library)."""
def __init__(self, host='localhost', port=161, version='2c', community='public', user='private', auth=''):
super(GlancesSNMPClient, self).__init__()
self.cmdGen = cmdgen.CommandGenerator()
self.version = version
self.host = host
self.port = port
self.community = community
self.user = user
self.auth = auth
def __buid_result(self, varBinds):
"""Build the results."""
ret = {}
for name, val in varBinds:
if str(val) == '':
ret[name.prettyPrint()] = ''
else:
ret[name.prettyPrint()] = val.prettyPrint()
# In Python 3, prettyPrint() return 'b'linux'' instead of 'linux'
if ret[name.prettyPrint()].startswith('b\''):
ret[name.prettyPrint()] = ret[name.prettyPrint()][2:-1]
return ret
def __get_result__(self, errorIndication, errorStatus, errorIndex, varBinds):
"""Put results in table."""
ret = {}
if not errorIndication or not errorStatus:
ret = self.__buid_result(varBinds)
return ret
def get_by_oid(self, *oid):
"""SNMP simple request (list of OID).
One request per OID list.
:param oid: oid list
:return: a dict
"""
if self.version == '3':
errorIndication, errorStatus, errorIndex, varBinds = self.cmdGen.getCmd(
cmdgen.UsmUserData(self.user, self.auth), cmdgen.UdpTransportTarget((self.host, self.port)), *oid
)
else:
errorIndication, errorStatus, errorIndex, varBinds = self.cmdGen.getCmd(
cmdgen.CommunityData(self.community), cmdgen.UdpTransportTarget((self.host, self.port)), *oid
)
return self.__get_result__(errorIndication, errorStatus, errorIndex, varBinds)
def __bulk_result__(self, errorIndication, errorStatus, errorIndex, varBindTable):
ret = []
if not errorIndication or not errorStatus:
for varBindTableRow in varBindTable:
ret.append(self.__buid_result(varBindTableRow))
return ret
def getbulk_by_oid(self, non_repeaters, max_repetitions, *oid):
"""SNMP getbulk request.
In contrast to snmpwalk, this information will typically be gathered in
a single transaction with the agent, rather than one transaction per
variable found.
* non_repeaters: This specifies the number of supplied variables that
should not be iterated over.
* max_repetitions: This specifies the maximum number of iterations over
the repeating variables.
* oid: oid list
> Return a list of dicts
"""
if self.version.startswith('3'):
errorIndication, errorStatus, errorIndex, varBinds = self.cmdGen.getCmd(
cmdgen.UsmUserData(self.user, self.auth),
cmdgen.UdpTransportTarget((self.host, self.port)),
non_repeaters,
max_repetitions,
*oid
)
if self.version.startswith('2'):
errorIndication, errorStatus, errorIndex, varBindTable = self.cmdGen.bulkCmd(
cmdgen.CommunityData(self.community),
cmdgen.UdpTransportTarget((self.host, self.port)),
non_repeaters,
max_repetitions,
*oid
)
else:
# Bulk request are not available with SNMP version 1
return []
return self.__bulk_result__(errorIndication, errorStatus, errorIndex, varBindTable)