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from pysnmp.proto import rfc1902
from pysnmp.smi.builder import ZipMibSource
from pysnmp.smi.compiler import addMibCompiler
from pysnmp.error import PySnmpError
from pyasn1.error import PyAsn1Error
#
# An OID-like object that embeds MIB resolution.
#
# Valid initializers include:
# MibVariable('1.3.6.1.2.1.1.1.0'),
# MibVariable('iso.org.dod.internet.mgmt.mib-2.system.sysDescr.0')
# MibVariable('SNMPv2-MIB', 'system'),
# MibVariable('SNMPv2-MIB', 'sysDescr', 0),
# MibVariable('IP-MIB', 'ipAdEntAddr', '127.0.0.1', 123),
#
class MibVariable:
stDirty, stOidOnly, stClean, stUnresolved = 1, 2, 4, 8
def __init__(self, *args):
self.__args = args
self.__mibSourcesToAdd = self.__modNamesToLoad = None
self.__asn1SourcesToAdd = None
self.__state = self.stDirty
#
# public API
#
def getMibSymbol(self):
if self.__state & self.stClean:
return self.__modName, self.__symName, self.__indices
else:
raise PySnmpError('%s object not fully initialized' % self.__class__.__name__)
def getOid(self):
if self.__state & (self.stOidOnly | self.stClean):
return self.__oid
else:
raise PySnmpError('%s object not fully initialized' % self.__class__.__name__)
def getLabel(self):
if self.__state & self.stClean:
return self.__label
else:
raise PySnmpError('%s object not fully initialized' % self.__class__.__name__)
def getMibNode(self): # XXX
if self.__state & self.stClean:
return self.__mibNode
else:
raise PySnmpError('%s object not fully initialized' % self.__class__.__name__)
def isFullyResolved(self):
return not (self.__state & self.stUnresolved)
#
# A gateway to MIBs manipulation routines
#
def addAsn1Sources(self, *asn1Sources):
self.__asn1SourcesToAdd = asn1Sources
return self
def addMibSource(self, *mibSources):
self.__mibSourcesToAdd = mibSources
return self
# provides deferred MIBs load
def loadMibs(self, *modNames):
self.__modNamesToLoad = modNames
return self
# this would eventually be called by an entity which posses a
# reference to MibViewController
def resolveWithMib(self, mibViewController, oidOnly=False):
if self.__mibSourcesToAdd is not None:
mibSources = tuple(
[ ZipMibSource(x) for x in self.__mibSourcesToAdd ]
) + mibViewController.mibBuilder.getMibSources()
mibViewController.mibBuilder.setMibSources(*mibSources)
self.__mibSourcesToAdd = None
if self.__asn1SourcesToAdd is not None:
addMibCompiler(
mibViewController.mibBuilder,
sources=self.__asn1SourcesToAdd
)
self.__asn1SourcesToAdd = None
if self.__modNamesToLoad is not None:
mibViewController.mibBuilder.loadModules(*self.__modNamesToLoad)
self.__modNamesToLoad = None
if self.__state & (self.stOidOnly | self.stClean):
return self
MibScalar, MibTableColumn, = mibViewController.mibBuilder.importSymbols('SNMPv2-SMI', 'MibScalar', 'MibTableColumn')
if len(self.__args) == 1: # OID or label
try:
self.__oid = rfc1902.ObjectName(self.__args[0])
except PyAsn1Error:
try:
label = tuple(self.__args[0].split('.'))
except ValueError:
raise PySnmpError('Bad OID format %s' % (self.__args[0],))
prefix, label, suffix = mibViewController.getNodeNameByOid(
label
)
if suffix:
try:
suffix = tuple([ int(x) for x in suffix ])
except ValueError:
raise PySnmpError('Unknown object name component %s' % (suffix,))
self.__oid = rfc1902.ObjectName(prefix + suffix)
self.__state |= self.stOidOnly
if oidOnly:
return self
else:
self.__state |= self.stOidOnly
if oidOnly:
return self
prefix, label, suffix = mibViewController.getNodeNameByOid(
self.__oid
)
modName, symName, _ = mibViewController.getNodeLocation(prefix)
self.__modName = modName
self.__symName = symName
self.__label = label
mibNode, = mibViewController.mibBuilder.importSymbols(
modName, symName
)
self.__mibNode = mibNode
if isinstance(mibNode, MibTableColumn): # table column
rowModName, rowSymName, _ = mibViewController.getNodeLocation(
mibNode.name[:-1]
)
rowNode, = mibViewController.mibBuilder.importSymbols(
rowModName, rowSymName
)
self.__indices = rowNode.getIndicesFromInstId(suffix)
elif isinstance(mibNode, MibScalar): # scalar
self.__indices = ( rfc1902.ObjectName(suffix), )
else:
self.__indices = ( rfc1902.ObjectName(suffix), )
self.__state |= self.stUnresolved
self.__state |= self.stClean
return self
elif len(self.__args) > 1: # MIB, symbol[, index, index ...]
self.__modName = self.__args[0]
if self.__args[1]:
self.__symName = self.__args[1]
else:
mibViewController.mibBuilder.loadModules(self.__modName)
oid, _, _ = mibViewController.getFirstNodeName(self.__modName)
_, self.__symName, _ = mibViewController.getNodeLocation(oid)
mibNode, = mibViewController.mibBuilder.importSymbols(
self.__modName, self.__symName
)
self.__mibNode = mibNode
self.__indices = ()
self.__oid = rfc1902.ObjectName(mibNode.getName())
prefix, label, suffix = mibViewController.getNodeNameByOid(
self.__oid
)
self.__label = label
if isinstance(mibNode, MibTableColumn): # table
rowModName, rowSymName, _ = mibViewController.getNodeLocation(
mibNode.name[:-1]
)
rowNode, = mibViewController.mibBuilder.importSymbols(
rowModName, rowSymName
)
if self.__args[2:]:
instIds = rowNode.getInstIdFromIndices(*self.__args[2:])
self.__oid += instIds
self.__indices = rowNode.getIndicesFromInstId(instIds)
elif self.__args[2:]: # any other kind of MIB node with indices
instId = rfc1902.ObjectName(
'.'.join([ str(x) for x in self.__args[2:] ])
)
self.__oid += instId
self.__indices = ( instId, )
self.__state |= (self.stClean | self.stOidOnly)
return self
else:
raise PySnmpError('Non-OID, label or MIB symbol')
def prettyPrint(self):
if self.__state & self.stClean:
return '%s::%s.%s' % (
self.__modName, self.__symName,
'.'.join(['"%s"' % x.prettyPrint() for x in self.__indices ])
)
else:
raise PySnmpError('%s object not fully initialized' % self.__class__.__name__)
def __repr__(self):
return '%s(%s)' % (self.__class__.__name__, ', '.join([ repr(x) for x in self.__args]))
# Redirect some attrs access to the OID object to behave alike
def __str__(self):
if self.__state & self.stOidOnly:
return str(self.__oid)
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __eq__(self, other):
if self.__state & self.stOidOnly:
return self.__oid == other
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __ne__(self, other):
if self.__state & self.stOidOnly:
return self.__oid != other
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __lt__(self, other):
if self.__state & self.stOidOnly:
return self.__oid < other
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __le__(self, other):
if self.__state & self.stOidOnly:
return self.__oid <= other
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __gt__(self, other):
if self.__state & self.stOidOnly:
return self.__oid > other
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __ge__(self, other):
if self.__state & self.stOidOnly:
return self.__oid > other
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __nonzero__(self):
if self.__state & self.stOidOnly:
return self.__oid != 0
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __bool__(self):
if self.__state & self.stOidOnly:
return bool(self.__oid)
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __getitem__(self, i):
if self.__state & self.stOidOnly:
return self.__oid[i]
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __len__(self):
if self.__state & self.stOidOnly:
return len(self.__oid)
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __add__(self, other):
if self.__state & self.stOidOnly:
return self.__oid + other
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __radd__(self, other):
if self.__state & self.stOidOnly:
return other + self.__oid
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __hash__(self):
if self.__state & self.stOidOnly:
return hash(self.__oid)
else:
raise PySnmpError('%s object not properly initialized' % self.__class__.__name__)
def __getattr__(self, attr):
if self.__state & self.stOidOnly:
if attr in ( 'asTuple', 'clone', 'subtype', 'isPrefixOf',
'isSameTypeWith', 'isSuperTypeOf'):
return getattr(self.__oid, attr)
raise AttributeError
else:
raise PySnmpError('%s object not properly initialized for %s access' % (self.__class__.__name__, attr))
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