# # This file is part of pysnmp software. # # Copyright (c) 2005-2019, Ilya Etingof # License: http://snmplabs.com/pysnmp/license.html # # ASN.1 source http://mibs.snmplabs.com/asn1/SNMPv2-TC # Produced by pysmi-0.4.0 at Sun Feb 17 00:21:05 2019 # # Parts of otherwise autogenerated MIB has been updated manually. # import inspect import string from pyasn1.compat import octets from pyasn1.type import univ from pyasn1.type.base import Asn1Item from pysnmp import debug from pysnmp.smi.error import * (Integer, OctetString, ObjectIdentifier) = mibBuilder.importSymbols( "ASN1", "Integer", "OctetString", "ObjectIdentifier") (NamedValues,) = mibBuilder.importSymbols( "ASN1-ENUMERATION", "NamedValues") (ConstraintsIntersection, SingleValueConstraint, ValueRangeConstraint, ValueSizeConstraint, ConstraintsUnion) = mibBuilder.importSymbols( "ASN1-REFINEMENT", "ConstraintsIntersection", "SingleValueConstraint", "ValueRangeConstraint", "ValueSizeConstraint", "ConstraintsUnion") (ModuleCompliance, NotificationGroup) = mibBuilder.importSymbols( "SNMPv2-CONF", "ModuleCompliance", "NotificationGroup") (MibScalar, MibTable, MibTableRow, MibTableColumn, MibIdentifier, Unsigned32, Gauge32, NotificationType, Counter64, ObjectIdentity, Bits, Counter32, ModuleIdentity, IpAddress, TimeTicks, Integer32, iso) = mibBuilder.importSymbols( "SNMPv2-SMI", "MibScalar", "MibTable", "MibTableRow", "MibTableColumn", "MibIdentifier", "Unsigned32", "Gauge32", "NotificationType", "Counter64", "ObjectIdentity", "Bits", "Counter32", "ModuleIdentity", "IpAddress", "TimeTicks", "Integer32", "iso") class TextualConvention(object): displayHint = '' status = 'current' description = '' reference = '' bits = () __integer = Integer() __unsigned32 = Unsigned32() __timeticks = TimeTicks() __octetString = OctetString() 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 getValue(self): return self.clone() def setValue(self, value): if value is None: value = univ.noValue return self.clone(value) def prettyOut(self, value): # override asn1 type method """Implements DISPLAY-HINT evaluation""" if self.displayHint and (self.__integer.isSuperTypeOf(self, matchConstraints=False) and not self.getNamedValues() or self.__unsigned32.isSuperTypeOf(self, matchConstraints=False) or self.__timeticks.isSuperTypeOf(self, matchConstraints=False)): _ = lambda t, f=0: (t, f) displayHintType, decimalPrecision = _(*self.displayHint.split('-')) if displayHintType == 'x': return '0x%x' % value elif displayHintType == 'd': try: return '%.*f' % (int(decimalPrecision), float(value) / pow(10, int(decimalPrecision))) except Exception as exc: raise SmiError( 'float evaluation error: %s' % exc ) elif displayHintType == 'o': return '0%o' % value elif displayHintType == 'b': runningValue = value outputValue = ['B'] while runningValue: outputValue.insert(0, '%d' % (runningValue & 0x01)) runningValue >>= 1 return ''.join(outputValue) else: raise SmiError( 'Unsupported numeric type spec "%s" at %s' % (displayHintType, self.__class__.__name__) ) elif self.displayHint and self.__octetString.isSuperTypeOf(self, matchConstraints=False): outputValue = '' runningValue = OctetString(value).asOctets() displayHint = self.displayHint while runningValue and displayHint: # 1 if displayHint[0] == '*': repeatIndicator = repeatCount = octets.oct2int(runningValue[0]) displayHint = displayHint[1:] runningValue = runningValue[1:] else: repeatCount = 1 repeatIndicator = None # 2 octetLength = '' while displayHint and displayHint[0] in string.digits: octetLength += displayHint[0] displayHint = displayHint[1:] # length is manatory, but people ignore that if not octetLength: octetLength = len(runningValue) try: octetLength = int(octetLength) except Exception: raise SmiError( 'Bad octet length: %s' % octetLength ) if not displayHint: raise SmiError( 'Short octet length: %s' % self.displayHint ) # 3 displayFormat = displayHint[0] displayHint = displayHint[1:] # 4 if displayHint and displayHint[0] not in string.digits and displayHint[0] != '*': displaySep = displayHint[0] displayHint = displayHint[1:] else: displaySep = '' # 5 if displayHint and displaySep and repeatIndicator is not None: repeatTerminator = displayHint[0] displaySep = '' displayHint = displayHint[1:] else: repeatTerminator = None while repeatCount: repeatCount -= 1 if displayFormat == 'a': outputValue += runningValue[:octetLength].decode('ascii', 'ignore') elif displayFormat == 't': outputValue += runningValue[:octetLength].decode('utf-8', 'ignore') elif displayFormat in ('x', 'd', 'o'): number = 0 numberString = runningValue[:octetLength] while numberString: number <<= 8 try: number |= octets.oct2int(numberString[0]) numberString = numberString[1:] except Exception as exc: raise SmiError( 'Display format eval failure: %s: %s' % (numberString, exc) ) if displayFormat == 'x': outputValue += '%02x' % number elif displayFormat == 'o': outputValue += '%03o' % number else: outputValue += '%d' % number else: raise SmiError( 'Unsupported display format char: %s' % displayFormat ) if runningValue and repeatTerminator: outputValue += repeatTerminator runningValue = runningValue[octetLength:] if runningValue and displaySep: outputValue += displaySep if not displayHint: displayHint = self.displayHint return outputValue for base in inspect.getmro(self.__class__): if not issubclass(base, TextualConvention) and issubclass(base, Asn1Item): return base.prettyOut(self, value) raise SmiError('TEXTUAL-CONVENTION has no underlying SNMP base type') def prettyIn(self, value): # override asn1 type method """Implements DISPLAY-HINT parsing into base SNMP value Proper parsing seems impossible due to ambiguities. Here we are trying to do our best, but be prepared for failures on complicated DISPLAY-HINTs. Keep in mind that this parser only works with "text" input meaning `unicode` (Py2) or `str` (Py3). """ for base in inspect.getmro(self.__class__): if not issubclass(base, TextualConvention) and issubclass(base, Asn1Item): break else: raise SmiError('TEXTUAL-CONVENTION has no underlying SNMP base type') if self.displayHint and (self.__integer.isSuperTypeOf(self, matchConstraints=False) and self.getNamedValues() or self.__unsigned32.isSuperTypeOf(self, matchConstraints=False) or self.__timeticks.isSuperTypeOf(self, matchConstraints=False)): value = str(value) _ = lambda t, f=0: (t, f) displayHintType, decimalPrecision = _(*self.displayHint.split('-')) if displayHintType == 'x' and (value.startswith('0x') or value.startswith('-0x')): try: if value.startswith('-'): return base.prettyIn(self, -int(value[3:], 16)) else: return base.prettyIn(self, int(value[2:], 16)) except Exception as exc: raise SmiError( 'integer evaluation error: %s' % exc ) elif displayHintType == 'd': try: return base.prettyIn(self, int(float(value) * 10**int(decimalPrecision))) except Exception as exc: raise SmiError( 'float evaluation error: %s' % exc ) elif displayHintType == 'o' and (value.startswith('0') or value.startswith('-0')): try: return base.prettyIn(self, int(value, 8)) except Exception as exc: raise SmiError( 'octal evaluation error: %s' % exc ) elif displayHintType == 'b' and (value.startswith('B') or value.startswith('-B')): negative = value.startswith('-') if negative: value = value[2:] else: value = value[1:] value = [x != '0' and 1 or 0 for x in value] binValue = 0 while value: binValue <<= value[0] del value[0] return base.prettyIn(self, binValue) else: raise SmiError( 'Unsupported numeric type spec "%s" at %s' % (displayHintType, self.__class__.__name__) ) elif self.displayHint and self.__octetString.isSuperTypeOf(self, matchConstraints=False): numBase = { 'x': 16, 'd': 10, 'o': 8 } numDigits = { 'x': octets.str2octs(string.hexdigits), 'o': octets.str2octs(string.octdigits), 'd': octets.str2octs(string.digits) } # how do we know if object is initialized with display-hint # formatted text? based on "text" input maybe? # That boils down to `str` object on Py3 or `unicode` on Py2. if octets.isStringType(value) and not octets.isOctetsType(value): value = base.prettyIn(self, value) else: return base.prettyIn(self, value) outputValue = octets.str2octs('') runningValue = value displayHint = self.displayHint while runningValue and displayHint: # 1 this information is totally lost, just fail explicitly if displayHint[0] == '*': raise SmiError( 'Can\'t parse "*" in DISPLAY-HINT (%s)' % self.__class__.__name__ ) # 2 this becomes ambiguous when it comes to rendered value octetLength = '' while displayHint and displayHint[0] in string.digits: octetLength += displayHint[0] displayHint = displayHint[1:] # length is mandatory but people ignore that if not octetLength: octetLength = len(runningValue) try: octetLength = int(octetLength) except Exception: raise SmiError( 'Bad octet length: %s' % octetLength ) if not displayHint: raise SmiError( 'Short octet length: %s' % self.displayHint ) # 3 displayFormat = displayHint[0] displayHint = displayHint[1:] # 4 this is the lifesaver -- we could use it as an anchor if displayHint and displayHint[0] not in string.digits and displayHint[0] != '*': displaySep = displayHint[0] displayHint = displayHint[1:] else: displaySep = '' # 5 is probably impossible to support if displayFormat in ('a', 't'): outputValue += runningValue[:octetLength] elif displayFormat in numBase: if displaySep: guessedOctetLength = runningValue.find(octets.str2octs(displaySep)) if guessedOctetLength == -1: guessedOctetLength = len(runningValue) else: for idx in range(len(runningValue)): if runningValue[idx] not in numDigits[displayFormat]: guessedOctetLength = idx break else: guessedOctetLength = len(runningValue) try: num = int(octets.octs2str(runningValue[:guessedOctetLength]), numBase[displayFormat]) except Exception as exc: raise SmiError( 'Display format eval failure: %s: %s' % (runningValue[:guessedOctetLength], exc) ) num_as_bytes = [] if num: while num: num_as_bytes.append(num & 0xFF) num >>= 8 else: num_as_bytes = [0] while len(num_as_bytes) < octetLength: num_as_bytes.append(0) num_as_bytes.reverse() outputValue += octets.ints2octs(num_as_bytes) if displaySep: guessedOctetLength += 1 octetLength = guessedOctetLength else: raise SmiError( 'Unsupported display format char: %s' % displayFormat ) runningValue = runningValue[octetLength:] if not displayHint: displayHint = self.displayHint return base.prettyIn(self, outputValue) else: return base.prettyIn(self, value) class DisplayString(TextualConvention, OctetString): status = "current" displayHint = "255a" subtypeSpec = OctetString.subtypeSpec subtypeSpec += ConstraintsUnion( ValueSizeConstraint(0, 255), ) if mibBuilder.loadTexts: description = """\ Represents textual information taken from the NVT ASCII character set, as defined in pages 4, 10-11 of RFC 854. To summarize RFC 854, the NVT ASCII repertoire specifies: - the use of character codes 0-127 (decimal) - the graphics characters (32-126) are interpreted as US ASCII - NUL, LF, CR, BEL, BS, HT, VT and FF have the special meanings specified in RFC 854 - the other 25 codes have no standard interpretation - the sequence 'CR LF' means newline - the sequence 'CR NUL' means carriage-return - an 'LF' not preceded by a 'CR' means moving to the same column on the next line. - the sequence 'CR x' for any x other than LF or NUL is illegal. (Note that this also means that a string may end with either 'CR LF' or 'CR NUL', but not with CR.) Any object defined using this syntax may not exceed 255 characters in length. """ class PhysAddress(TextualConvention, OctetString): status = "current" displayHint = "1x:" if mibBuilder.loadTexts: description = """\ Represents media- or physical-level addresses. """ class MacAddress(TextualConvention, OctetString): status = "current" displayHint = "1x:" subtypeSpec = OctetString.subtypeSpec subtypeSpec += ConstraintsUnion( ValueSizeConstraint(6, 6), ) fixedLength = 6 if mibBuilder.loadTexts: description = """\ Represents an 802 MAC address represented in the `canonical' order defined by IEEE 802.1a, i.e., as if it were transmitted least significant bit first, even though 802.5 (in contrast to other 802.x protocols) requires MAC addresses to be transmitted most significant bit first. """ class TruthValue(TextualConvention, Integer32): status = "current" subtypeSpec = Integer32.subtypeSpec subtypeSpec += ConstraintsUnion( SingleValueConstraint( *(1, 2) ) ) namedValues = NamedValues( *(("false", 2), ("true", 1)) ) if mibBuilder.loadTexts: description = """\ Represents a boolean value. """ class TestAndIncr(TextualConvention, Integer32): status = "current" subtypeSpec = Integer32.subtypeSpec subtypeSpec += ConstraintsUnion( ValueRangeConstraint(0, 2147483647), ) if mibBuilder.loadTexts: description = """\ Represents integer-valued information used for atomic operations. When the management protocol is used to specify that an object instance having this syntax is to be modified, the new value supplied via the management protocol must precisely match the value presently held by the instance. If not, the management protocol set operation fails with an error of `inconsistentValue'. Otherwise, if the current value is the maximum value of 2^31-1 (2147483647 decimal), then the value held by the instance is wrapped to zero; otherwise, the value held by the instance is incremented by one. (Note that regardless of whether the management protocol set operation succeeds, the variable- binding in the request and response PDUs are identical.) The value of the ACCESS clause for objects having this syntax is either `read-write' or `read-create'. When an instance of a columnar object having this syntax is created, any value may be supplied via the management protocol. When the network management portion of the system is re- initialized, the value of every object instance having this syntax must either be incremented from its value prior to the re- initialization, or (if the value prior to the re- initialization is unknown) be set to a pseudo-randomly generated value. """ defaultValue = 0 def setValue(self, value): if value is not None: if value != self: raise InconsistentValueError() value += 1 if value > 2147483646: value = 0 if value is None: value = univ.noValue return self.clone(value) class AutonomousType(TextualConvention, ObjectIdentifier): status = "current" if mibBuilder.loadTexts: description = """\ Represents an independently extensible type identification value. It may, for example, indicate a particular sub-tree with further MIB definitions, or define a particular type of protocol or hardware. """ class InstancePointer(TextualConvention, ObjectIdentifier): status = "obsolete" if mibBuilder.loadTexts: description = """\ A pointer to either a specific instance of a MIB object or a conceptual row of a MIB table in the managed device. In the latter case, by convention, it is the name of the particular instance of the first accessible columnar object in the conceptual row. The two uses of this textual convention are replaced by VariablePointer and RowPointer, respectively. """ class VariablePointer(TextualConvention, ObjectIdentifier): status = "current" if mibBuilder.loadTexts: description = """\ A pointer to a specific object instance. For example, sysContact.0 or ifInOctets.3. """ class RowPointer(TextualConvention, ObjectIdentifier): status = "current" if mibBuilder.loadTexts: description = """\ Represents a pointer to a conceptual row. The value is the name of the instance of the first accessible columnar object in the conceptual row. For example, ifIndex.3 would point to the 3rd row in the ifTable (note that if ifIndex were not-accessible, then ifDescr.3 would be used instead). """ class RowStatus(TextualConvention, Integer): """A special kind of scalar MIB variable responsible for MIB table row creation/destruction. """ status = "current" subtypeSpec = Integer.subtypeSpec subtypeSpec += ConstraintsUnion( SingleValueConstraint( *(0, 1, 2, 3, 4, 5, 6) ) ) namedValues = NamedValues( *(("notExists", 0), ("active", 1), ("createAndGo", 4), ("createAndWait", 5), ("destroy", 6), ("notInService", 2), ("notReady", 3)) ) if mibBuilder.loadTexts: description = """\ The RowStatus textual convention is used to manage the creation and deletion of conceptual rows, and is used as the value of the SYNTAX clause for the status column of a conceptual row (as described in Section 7.7.1 of [2].) The status column has six defined values: - `active', which indicates that the conceptual row is available for use by the managed device; - `notInService', which indicates that the conceptual row exists in the agent, but is unavailable for use by the managed device (see NOTE below); 'notInService' has no implication regarding the internal consistency of the row, availability of resources, or consistency with the current state of the managed device; - `notReady', which indicates that the conceptual row exists in the agent, but is missing information necessary in order to be available for use by the managed device (i.e., one or more required columns in the conceptual row have not been instanciated); - `createAndGo', which is supplied by a management station wishing to create a new instance of a conceptual row and to have its status automatically set to active, making it available for use by the managed device; - `createAndWait', which is supplied by a management station wishing to create a new instance of a conceptual row (but not make it available for use by the managed device); and, - `destroy', which is supplied by a management station wishing to delete all of the instances associated with an existing conceptual row. Whereas five of the six values (all except `notReady') may be specified in a management protocol set operation, only three values will be returned in response to a management protocol retrieval operation: `notReady', `notInService' or `active'. That is, when queried, an existing conceptual row has only three states: it is either available for use by the managed device (the status column has value `active'); it is not available for use by the managed device, though the agent has sufficient information to attempt to make it so (the status column has value `notInService'); or, it is not available for use by the managed device, and an attempt to make it so would fail because the agent has insufficient information (the state column has value `notReady'). NOTE WELL This textual convention may be used for a MIB table, irrespective of whether the values of that table's conceptual rows are able to be modified while it is active, or whether its conceptual rows must be taken out of service in order to be modified. That is, it is the responsibility of the DESCRIPTION clause of the status column to specify whether the status column must not be `active' in order for the value of some other column of the same conceptual row to be modified. If such a specification is made, affected columns may be changed by an SNMP set PDU if the RowStatus would not be equal to `active' either immediately before or after processing the PDU. In other words, if the PDU also contained a varbind that would change the RowStatus value, the column in question may be changed if the RowStatus was not equal to `active' as the PDU was received, or if the varbind sets the status to a value other than 'active'. Also note that whenever any elements of a row exist, the RowStatus column must also exist. To summarize the effect of having a conceptual row with a status column having a SYNTAX clause value of RowStatus, consider the following state diagram: STATE +--------------+-----------+-------------+------------- | A | B | C | D | |status col.|status column| |status column | is | is |status column ACTION |does not exist| notReady | notInService| is active --------------+--------------+-----------+-------------+------------- set status |noError ->D|inconsist- |inconsistent-|inconsistent- column to | or | entValue| Value| Value createAndGo |inconsistent- | | | | Value| | | --------------+--------------+-----------+-------------+------------- set status |noError see 1|inconsist- |inconsistent-|inconsistent- column to | or | entValue| Value| Value createAndWait |wrongValue | | | --------------+--------------+-----------+-------------+------------- set status |inconsistent- |inconsist- |noError |noError column to | Value| entValue| | active | | | | | | or | | | | | | | |see 2 ->D|see 8 ->D| ->D --------------+--------------+-----------+-------------+------------- set status |inconsistent- |inconsist- |noError |noError ->C column to | Value| entValue| | notInService | | | | | | or | | or | | | | | |see 3 ->C| ->C|see 6 --------------+--------------+-----------+-------------+------------- set status |noError |noError |noError |noError ->A column to | | | | or destroy | ->A| ->A| ->A|see 7 --------------+--------------+-----------+-------------+------------- set any other |see 4 |noError |noError |see 5 column to some| | | | value | | see 1| ->C| ->D --------------+--------------+-----------+-------------+------------- (1) goto B or C, depending on information available to the agent. (2) if other variable bindings included in the same PDU, provide values for all columns which are missing but required, and all columns have acceptable values, then return noError and goto D. (3) if other variable bindings included in the same PDU, provide legal values for all columns which are missing but required, then return noError and goto C. (4) at the discretion of the agent, the return value may be either: inconsistentName: because the agent does not choose to create such an instance when the corresponding RowStatus instance does not exist, or inconsistentValue: if the supplied value is inconsistent with the state of some other MIB object's value, or noError: because the agent chooses to create the instance. If noError is returned, then the instance of the status column must also be created, and the new state is B or C, depending on the information available to the agent. If inconsistentName or inconsistentValue is returned, the row remains in state A. (5) depending on the MIB definition for the column/table, either noError or inconsistentValue may be returned. (6) the return value can indicate one of the following errors: wrongValue: because the agent does not support notInService (e.g., an agent which does not support createAndWait), or inconsistentValue: because the agent is unable to take the row out of service at this time, perhaps because it is in use and cannot be de- activated. (7) the return value can indicate the following error: inconsistentValue: because the agent is unable to remove the row at this time, perhaps because it is in use and cannot be de-activated. (8) the transition to D can fail, e.g., if the values of the conceptual row are inconsistent, then the error code would be inconsistentValue. NOTE: Other processing of (this and other varbinds of) the set request may result in a response other than noError being returned, e.g., wrongValue, noCreation, etc. Conceptual Row Creation There are four potential interactions when creating a conceptual row: selecting an instance-identifier which is not in use; creating the conceptual row; initializing any objects for which the agent does not supply a default; and, making the conceptual row available for use by the managed device. Interaction 1: Selecting an Instance-Identifier The algorithm used to select an instance- identifier varies for each conceptual row. In some cases, the instance- identifier is semantically significant, e.g., the destination address of a route, and a management station selects the instance-identifier according to the semantics. In other cases, the instance-identifier is used solely to distinguish conceptual rows, and a management station without specific knowledge of the conceptual row might examine the instances present in order to determine an unused instance-identifier. (This approach may be used, but it is often highly sub-optimal; however, it is also a questionable practice for a naive management station to attempt conceptual row creation.) Alternately, the MIB module which defines the conceptual row might provide one or more objects which provide assistance in determining an unused instance-identifier. For example, if the conceptual row is indexed by an integer-value, then an object having an integer-valued SYNTAX clause might be defined for such a purpose, allowing a management station to issue a management protocol retrieval operation. In order to avoid unnecessary collisions between competing management stations, `adjacent' retrievals of this object should be different. Finally, the management station could select a pseudo-random number to use as the index. In the event that this index was already in use and an inconsistentValue was returned in response to the management protocol set operation, the management station should simply select a new pseudo-random number and retry the operation. A MIB designer should choose between the two latter algorithms based on the size of the table (and therefore the efficiency of each algorithm). For tables in which a large number of entries are expected, it is recommended that a MIB object be defined that returns an acceptable index for creation. For tables with small numbers of entries, it is recommended that the latter pseudo-random index mechanism be used. Interaction 2: Creating the Conceptual Row Once an unused instance-identifier has been selected, the management station determines if it wishes to create and activate the conceptual row in one transaction or in a negotiated set of interactions. Interaction 2a: Creating and Activating the Conceptual Row The management station must first determine the column requirements, i.e., it must determine those columns for which it must or must not provide values. Depending on the complexity of the table and the management station's knowledge of the agent's capabilities, this determination can be made locally by the management station. Alternately, the management station issues a management protocol get operation to examine all columns in the conceptual row that it wishes to create. In response, for each column, there are three possible outcomes: - a value is returned, indicating that some other management station has already created this conceptual row. We return to interaction 1. - the exception `noSuchInstance' is returned, indicating that the agent implements the object- type associated with this column, and that this column in at least one conceptual row would be accessible in the MIB view used by the retrieval were it to exist. For those columns to which the agent provides read-create access, the `noSuchInstance' exception tells the management station that it should supply a value for this column when the conceptual row is to be created. - the exception `noSuchObject' is returned, indicating that the agent does not implement the object-type associated with this column or that there is no conceptual row for which this column would be accessible in the MIB view used by the retrieval. As such, the management station can not issue any management protocol set operations to create an instance of this column. Once the column requirements have been determined, a management protocol set operation is accordingly issued. This operation also sets the new instance of the status column to `createAndGo'. When the agent processes the set operation, it verifies that it has sufficient information to make the conceptual row available for use by the managed device. The information available to the agent is provided by two sources: the management protocol set operation which creates the conceptual row, and, implementation-specific defaults supplied by the agent (note that an agent must provide implementation-specific defaults for at least those objects which it implements as read-only). If there is sufficient information available, then the conceptual row is created, a `noError' response is returned, the status column is set to `active', and no further interactions are necessary (i.e., interactions 3 and 4 are skipped). If there is insufficient information, then the conceptual row is not created, and the set operation fails with an error of `inconsistentValue'. On this error, the management station can issue a management protocol retrieval operation to determine if this was because it failed to specify a value for a required column, or, because the selected instance of the status column already existed. In the latter case, we return to interaction 1. In the former case, the management station can re-issue the set operation with the additional information, or begin interaction 2 again using `createAndWait' in order to negotiate creation of the conceptual row. NOTE WELL Regardless of the method used to determine the column requirements, it is possible that the management station might deem a column necessary when, in fact, the agent will not allow that particular columnar instance to be created or written. In this case, the management protocol set operation will fail with an error such as `noCreation' or `notWritable'. In this case, the management station decides whether it needs to be able to set a value for that particular columnar instance. If not, the management station re-issues the management protocol set operation, but without setting a value for that particular columnar instance; otherwise, the management station aborts the row creation algorithm. Interaction 2b: Negotiating the Creation of the Conceptual Row The management station issues a management protocol set operation which sets the desired instance of the status column to `createAndWait'. If the agent is unwilling to process a request of this sort, the set operation fails with an error of `wrongValue'. (As a consequence, such an agent must be prepared to accept a single management protocol set operation, i.e., interaction 2a above, containing all of the columns indicated by its column requirements.) Otherwise, the conceptual row is created, a `noError' response is returned, and the status column is immediately set to either `notInService' or `notReady', depending on whether it has sufficient information to (attempt to) make the conceptual row available for use by the managed device. If there is sufficient information available, then the status column is set to `notInService'; otherwise, if there is insufficient information, then the status column is set to `notReady'. Regardless, we proceed to interaction 3. Interaction 3: Initializing non-defaulted Objects The management station must now determine the column requirements. It issues a management protocol get operation to examine all columns in the created conceptual row. In the response, for each column, there are three possible outcomes: - a value is returned, indicating that the agent implements the object-type associated with this column and had sufficient information to provide a value. For those columns to which the agent provides read-create access (and for which the agent allows their values to be changed after their creation), a value return tells the management station that it may issue additional management protocol set operations, if it desires, in order to change the value associated with this column. - the exception `noSuchInstance' is returned, indicating that the agent implements the object-type associated with this column, and that this column in at least one conceptual row would be accessible in the MIB view used by the retrieval were it to exist. However, the agent does not have sufficient information to provide a value, and until a value is provided, the conceptual row may not be made available for use by the managed device. For those columns to which the agent provides read-create access, the `noSuchInstance' exception tells the management station that it must issue additional management protocol set operations, in order to provide a value associated with this column. - the exception `noSuchObject' is returned, indicating that the agent does not implement the object-type associated with this column or that there is no conceptual row for which this column would be accessible in the MIB view used by the retrieval. As such, the management station can not issue any management protocol set operations to create an instance of this column. If the value associated with the status column is `notReady', then the management station must first deal with all `noSuchInstance' columns, if any. Having done so, the value of the status column becomes `notInService', and we proceed to interaction 4. Interaction 4: Making the Conceptual Row Available Once the management station is satisfied with the values associated with the columns of the conceptual row, it issues a management protocol set operation to set the status column to `active'. If the agent has sufficient information to make the conceptual row available for use by the managed device, the management protocol set operation succeeds (a `noError' response is returned). Otherwise, the management protocol set operation fails with an error of `inconsistentValue'. NOTE WELL A conceptual row having a status column with value `notInService' or `notReady' is unavailable to the managed device. As such, it is possible for the managed device to create its own instances during the time between the management protocol set operation which sets the status column to `createAndWait' and the management protocol set operation which sets the status column to `active'. In this case, when the management protocol set operation is issued to set the status column to `active', the values held in the agent supersede those used by the managed device. If the management station is prevented from setting the status column to `active' (e.g., due to management station or network failure) the conceptual row will be left in the `notInService' or `notReady' state, consuming resources indefinitely. The agent must detect conceptual rows that have been in either state for an abnormally long period of time and remove them. It is the responsibility of the DESCRIPTION clause of the status column to indicate what an abnormally long period of time would be. This period of time should be long enough to allow for human response time (including `think time') between the creation of the conceptual row and the setting of the status to `active'. In the absence of such information in the DESCRIPTION clause, it is suggested that this period be approximately 5 minutes in length. This removal action applies not only to newly-created rows, but also to previously active rows which are set to, and left in, the notInService state for a prolonged period exceeding that which is considered normal for such a conceptual row. Conceptual Row Suspension When a conceptual row is `active', the management station may issue a management protocol set operation which sets the instance of the status column to `notInService'. If the agent is unwilling to do so, the set operation fails with an error of `wrongValue' or `inconsistentValue'. Otherwise, the conceptual row is taken out of service, and a `noError' response is returned. It is the responsibility of the DESCRIPTION clause of the status column to indicate under what circumstances the status column should be taken out of service (e.g., in order for the value of some other column of the same conceptual row to be modified). Conceptual Row Deletion For deletion of conceptual rows, a management protocol set operation is issued which sets the instance of the status column to `destroy'. This request may be made regardless of the current value of the status column (e.g., it is possible to delete conceptual rows which are either `notReady', `notInService' or `active'.) If the operation succeeds, then all instances associated with the conceptual row are immediately removed. """ # Known row states (stNotExists, stActive, stNotInService, stNotReady, stCreateAndGo, stCreateAndWait, stDestroy) = list(range(7)) # States transition matrix (see RFC-1903) STATE_MATRIX = { # (new-state, current-state) -> (error, new-state) (stCreateAndGo, stNotExists): (RowCreationWanted, stActive), (stCreateAndGo, stNotReady): (InconsistentValueError, stNotReady), (stCreateAndGo, stNotInService): (InconsistentValueError, stNotInService), (stCreateAndGo, stActive): (InconsistentValueError, stActive), # (stCreateAndWait, stNotExists): (RowCreationWanted, stNotReady), (stCreateAndWait, stNotReady): (InconsistentValueError, stNotReady), (stCreateAndWait, stNotInService): (InconsistentValueError, stNotInService), (stCreateAndWait, stActive): (InconsistentValueError, stActive), # (stActive, stNotExists): (InconsistentValueError, stNotExists), (stActive, stNotReady): (RowConsistencyWanted, stActive), (stActive, stNotInService): (RowConsistencyWanted, stActive), (stActive, stActive): (None, stActive), # (stNotInService, stNotExists): (InconsistentValueError, stNotExists), (stNotInService, stNotReady): (None, stNotReady), (stNotInService, stNotInService): (None, stNotInService), (stNotInService, stActive): (None, stActive), # (stDestroy, stNotExists): (RowDestructionWanted, stNotExists), (stDestroy, stNotReady): (RowDestructionWanted, stNotExists), (stDestroy, stNotInService): (RowDestructionWanted, stNotExists), (stDestroy, stActive): (RowDestructionWanted, stNotExists), # This is used on instantiation (stNotExists, stNotExists): (None, stNotExists) } def setValue(self, value): if value is None: value = univ.noValue value = self.clone(value) # Run through states transition matrix, # resolve new instance value excValue, newState = self.STATE_MATRIX.get( (value.hasValue() and value or self.stNotExists, self.hasValue() and self or self.stNotExists), (MibOperationError, None) ) if newState is None: newState = univ.noValue newState = self.clone(newState) debug.logger & debug.FLAG_INS and debug.logger( 'RowStatus state change from %r to %r produced new state %r, error indication %r' % ( self, value, newState, excValue)) if excValue is not None: excValue = excValue( msg='Exception at row state transition from %r to %r yields state %r and exception' % ( self, value, newState), syntax=newState ) raise excValue return newState class TimeStamp(TextualConvention, TimeTicks): status = "current" if mibBuilder.loadTexts: description = """\ The value of the sysUpTime object at which a specific occurrence happened. The specific occurrence must be defined in the description of any object defined using this type. If sysUpTime is reset to zero as a result of a re- initialization of the network management (sub)system, then the values of all TimeStamp objects are also reset. However, after approximately 497 days without a re- initialization, the sysUpTime object will reach 2^^32-1 and then increment around to zero; in this case, existing values of TimeStamp objects do not change. This can lead to ambiguities in the value of TimeStamp objects. """ class TimeInterval(TextualConvention, Integer32): status = "current" subtypeSpec = Integer32.subtypeSpec subtypeSpec += ConstraintsUnion( ValueRangeConstraint(0, 2147483647), ) if mibBuilder.loadTexts: description = """\ A period of time, measured in units of 0.01 seconds. """ class DateAndTime(TextualConvention, OctetString): status = "current" displayHint = "2d-1d-1d,1d:1d:1d.1d,1a1d:1d" subtypeSpec = OctetString.subtypeSpec subtypeSpec += ConstraintsUnion( ValueSizeConstraint(8, 8), ValueSizeConstraint(11, 11), ) if mibBuilder.loadTexts: description = """\ A date-time specification. field octets contents range ----- ------ -------- ----- 1 1-2 year* 0..65536 2 3 month 1..12 3 4 day 1..31 4 5 hour 0..23 5 6 minutes 0..59 6 7 seconds 0..60 (use 60 for leap-second) 7 8 deci-seconds 0..9 8 9 direction from UTC '+' / '-' 9 10 hours from UTC* 0..13 10 11 minutes from UTC 0..59 * Notes: - the value of year is in network-byte order - daylight saving time in New Zealand is +13 For example, Tuesday May 26, 1992 at 1:30:15 PM EDT would be displayed as: 1992-5-26,13:30:15.0,-4:0 Note that if only local time is known, then timezone information (fields 8-10) is not present. """ class StorageType(TextualConvention, Integer32): status = "current" subtypeSpec = Integer32.subtypeSpec subtypeSpec += ConstraintsUnion( SingleValueConstraint( *(1, 2, 3, 4, 5) ) ) namedValues = NamedValues( *(("nonVolatile", 3), ("other", 1), ("permanent", 4), ("readOnly", 5), ("volatile", 2)) ) if mibBuilder.loadTexts: description = """\ Describes the memory realization of a conceptual row. A row which is volatile(2) is lost upon reboot. A row which is either nonVolatile(3), permanent(4) or readOnly(5), is backed up by stable storage. A row which is permanent(4) can be changed but not deleted. A row which is readOnly(5) cannot be changed nor deleted. If the value of an object with this syntax is either permanent(4) or readOnly(5), it cannot be written. Conversely, if the value is either other(1), volatile(2) or nonVolatile(3), it cannot be modified to be permanent(4) or readOnly(5). (All illegal modifications result in a 'wrongValue' error.) Every usage of this textual convention is required to specify the columnar objects which a permanent(4) row must at a minimum allow to be writable. """ class TDomain(TextualConvention, ObjectIdentifier): status = "current" if mibBuilder.loadTexts: description = """\ Denotes a kind of transport service. Some possible values, such as snmpUDPDomain, are defined in the SNMPv2-TM MIB module. Other possible values are defined in other MIB modules. """ class TAddress(TextualConvention, OctetString): status = "current" subtypeSpec = OctetString.subtypeSpec subtypeSpec += ConstraintsUnion( ValueSizeConstraint(1, 255), ) if mibBuilder.loadTexts: description = """\ Denotes a transport service address. A TAddress value is always interpreted within the context of a TDomain value. Thus, each definition of a TDomain value must be accompanied by a definition of a textual convention for use with that TDomain. Some possible textual conventions, such as SnmpUDPAddress for snmpUDPDomain, are defined in the SNMPv2-TM MIB module. Other possible textual conventions are defined in other MIB modules. """ 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} )