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from string import split, digits
from pysnmp.smi import error
from pyasn1.type import constraint, namedval
OctetString, Integer, ObjectIdentifier = mibBuilder.importSymbols(
'ASN1', 'OctetString', 'Integer', 'ObjectIdentifier'
)
TimeTicks, = mibBuilder.importSymbols('SNMPv2-SMI', 'TimeTicks')
class TextualConvention:
displayHint = ''
status = 'current'
description = ''
reference = ''
bits = ()
__integer = Integer()
__octetString = OctetString()
__objectIdentifier = ObjectIdentifier()
def getDisplayHint(self): return self.displayHint
def getStatus(self): return self.status
def getDescription(self): return self.description
def getReference(self): return self.reference
def prettyOut(self, value): # override asn1 type method
"""Implements DISPLAY-HINT evaluation"""
if self.displayHint and self.__integer.isSuperTypeOf(self):
t, f = apply(lambda t, f=0: (t, f), split(self.displayHint, '-'))
if t == 'x':
return '0x%x' % value
elif t == 'd':
try:
return '%.*f' % (int(f), float(value)/pow(10, int(f)))
except StandardError, why:
raise error.SmiError(
'float num evaluation error: %s' % why
)
elif t == 'o':
return '0%o' % value
elif t == 'b':
v = value; r = ['B']
while v:
r.insert(0, '%d' % (v&0x01))
v = v>>1
return join(r, '')
else:
raise error.SmiError(
'Unsupported numeric type spec: %s' % t
)
elif self.displayHint and self.__octetString.isSuperTypeOf(self):
r = ''
v = str(value)
d = self.displayHint
while v and d:
# 1
if d[0] == '*':
repeatIndicator = repeatCount = int(v[0])
d = d[1:]; v = v[1:]
else:
repeatCount = 1; repeatIndicator = None
# 2
octetLength = ''
while d and d[0] in digits:
octetLength = octetLength + d[0]
d = d[1:]
try:
octetLength = int(octetLength)
except StandardError, why:
raise error.SmiError(
'Bad octet length: %s' % octetLength
)
if not d:
raise error.SmiError(
'Short octet length: %s' % self.displayHint
)
# 3
displayFormat = d[0]
d = d[1:]
# 4
if d and d[0] not in digits and d[0] != '*':
displaySep = d[0]
d = d[1:]
else:
displaySep = ''
# 5
if d and displaySep and repeatIndicator is not None:
repeatTerminator = d[0]
displaySep = ''
d = d[1:]
else:
repeatTerminator = None
while repeatCount:
repeatCount = repeatCount - 1
if displayFormat == 'a':
r = r + v[:octetLength]
elif displayFormat in ('x', 'd', 'o'):
n = 0L; vv = v[:octetLength]
while vv:
n = n << 8
try:
n = n | ord(vv[0])
vv = vv[1:]
except StandardError, why:
raise error.SmiError(
'Display format eval failure: %s: %s'
% (vv, why)
)
if displayFormat == 'x':
r = r + '%02x' % n
elif displayFormat == 'o':
r = r + '%03o' % n
else:
r = r + '%d' % n
else:
raise error.SmiError(
'Unsupported display format char: %s' % \
displayFormat
)
if v and repeatTerminator:
r = r + repeatTerminator
v = v[octetLength:]
if v and displaySep:
r = r + displaySep
if not d:
d = self.displayHint
# if d:
# raise error.SmiError(
# 'Unparsed display hint left: %s' % d
# )
return r
elif self.displayHint and self.__objectIdentifier.isSuperTypeOf(self):
return str(value)
else:
return str(value)
# elif self.bits:
# try:
# return self.bits[value]
# except StandardError, why:
# raise error.SmiError(
# 'Enumeratin resolution failure for %s: %s' % (self, why)
# )
# XXX
# def prettyIn(self, value):
# # XXX parse TC syntax
# return str(value)
class DisplayString(TextualConvention, OctetString):
subtypeSpec = OctetString.subtypeSpec+constraint.ValueSizeConstraint(0,255)
displayHint = "255a"
class PhysAddress(TextualConvention, OctetString):
displayHint = "1x:"
class MacAddress(TextualConvention, OctetString):
subtypeSpec = OctetString.subtypeSpec+constraint.ValueSizeConstraint(6,6)
displayHint = "1x:"
class TruthValue(Integer, TextualConvention):
subtypeSpec = Integer.subtypeSpec+constraint.SingleValueConstraint(1, 2)
namedValues = namedval.NamedValues(('true', 1), ('false', 2))
class TestAndIncr(Integer, TextualConvention):
subtypeSpec = Integer.subtypeSpec+constraint.ValueRangeConstraint(0, 2147483647L)
defaultValue = 0
def clone(self, value=None, tagSet=None, subtypeSpec=None):
if value is None:
return self
if value != self:
raise error.InconsistentValueError(
'Old/new values mismatch %s: %s' % (self, value)
)
value = value + 1
if value > 2147483646:
value = 0
return Integer.clone(self, value, tagSet, subtypeSpec)
class AutonomousType(ObjectIdentifier, TextualConvention): pass
class InstancePointer(ObjectIdentifier, TextualConvention):
status = 'obsolete'
class VariablePointer(ObjectIdentifier, TextualConvention): pass
class RowPointer(ObjectIdentifier, TextualConvention): pass
class RowStatus(Integer, TextualConvention):
"""A special kind of scalar MIB variable responsible for
MIB table row creation/destruction.
"""
subtypeSpec = Integer.subtypeSpec+constraint.SingleValueConstraint(0, 1, 2, 3, 4, 5, 6)
namedValues = namedval.NamedValues(
('notExists', 0), ('active', 1), ('notInService', 2), ('notReady', 3),
('createAndGo', 4), ('createAndWait', 5), ('destroy', 6)
)
# Known row states
stNotExists, stActive, stNotInService, stNotReady, \
stCreateAndGo, stCreateAndWait, stDestroy = range(7)
# States transition matrix (see RFC-1903)
stateMatrix = {
# (new-state, current-state) -> (error, new-state)
( stCreateAndGo, stNotExists ): (
error.RowCreationWanted, stActive
),
( stCreateAndGo, stNotReady ): (
error.InconsistentValueError, stNotReady
),
( stCreateAndGo, stNotInService ): (
error.InconsistentValueError, stNotInService
),
( stCreateAndGo, stActive ): (
error.InconsistentValueError, stActive
),
#
( stCreateAndWait, stNotExists ): (
error.RowCreationWanted, stActive
),
( stCreateAndWait, stNotReady ): (
error.InconsistentValueError, stNotReady
),
( stCreateAndWait, stNotInService ): (
error.InconsistentValueError, stNotInService
),
( stCreateAndWait, stActive ): (
error.InconsistentValueError, stActive
),
#
( stActive, stNotExists ): (
error.InconsistentValueError, stNotExists
),
( stActive, stNotReady ): (
error.InconsistentValueError, stNotReady
),
( stActive, stNotInService ): (
None, stActive
),
( stActive, stActive ): (
None, stActive
),
#
( stNotInService, stNotExists ): (
error.InconsistentValueError, stNotExists
),
( stNotInService, stNotReady ): (
error.InconsistentValueError, stNotReady
),
( stNotInService, stNotInService ): (
None, stNotInService
),
( stNotInService, stActive ): (
None, stActive
),
#
( stDestroy, stNotExists ): (
error.RowDestructionWanted, stNotExists
),
( stDestroy, stNotReady ): (
error.RowDestructionWanted, stNotExists
),
( stDestroy, stNotInService ): (
error.RowDestructionWanted, stNotExists
),
( stDestroy, stActive ): (
error.RowDestructionWanted, stNotExists
),
# This is used on instantiation
( stNotExists, stNotExists ): (
None, stNotExists
)
}
defaultValue = stNotExists
def clone(self, value=None, tagSet=None, subtypeSpec=None): # XXX
if value is None:
return self
# Run through states transition matrix, resolve new instance value
err, val = self.stateMatrix.get(
(value, int(self)), (error.SmiError, None)
)
if err is not None:
err = err(
msg='Exception at row state transition %s->%s' % (self, value)
)
if val is not None:
return RowStatus(val)
if err is not None:
raise err
return self
class TimeStamp(TimeTicks, TextualConvention): pass
class TimeInterval(Integer, TextualConvention):
subtypeSpec = Integer.subtypeSpec+constraint.ValueRangeConstraint(0, 2147483647L)
class DateAndTime(TextualConvention, OctetString):
subtypeSpec = Integer.subtypeSpec+constraint.ValueSizeConstraint(8, 11)
displayHint = "2d-1d-1d,1d:1d:1d.1d,1a1d:1d"
class StorageType(Integer, TextualConvention):
subtypeSpec = Integer.subtypeSpec+constraint.SingleValueConstraint(1, 2, 3, 4, 5)
namedValues = namedval.NamedValues(
('other', 1), ('volatile', 2), ('nonVolatile', 3),
('permanent', 4), ('readOnly', 5)
)
class TDomain(ObjectIdentifier, TextualConvention): pass
class TAddress(OctetString, TextualConvention):
subtypeSpec = Integer.subtypeSpec+constraint.ValueSizeConstraint(1, 255)
mibBuilder.exportSymbols(
'SNMPv2-TC', TextualConvention=TextualConvention, DisplayString=DisplayString,
PhysAddress=PhysAddress, MacAddress=MacAddress, TruthValue=TruthValue,
TestAndIncr=TestAndIncr, AutonomousType=AutonomousType,
InstancePointer=InstancePointer, VariablePointer=VariablePointer,
RowPointer=RowPointer, RowStatus=RowStatus, TimeStamp=TimeStamp,
TimeInterval=TimeInterval, DateAndTime=DateAndTime, StorageType=StorageType,
TDomain=TDomain, TAddress=TAddress
)
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