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#
# This file is part of pysnmp-apps software.
#
# Copyright (c) 2005-2016, Ilya Etingof <ilya@glas.net>
# License: http://pysnmp.sf.net/license.html
#
import sys
from pyasn1.type import univ
from pyasn1.error import PyAsn1Error
from pysnmp.proto import rfc1902
from pysnmp import error
from pysnmp_apps.cli import base
# Read class
# Usage
def getReadUsage():
return "\
Management parameters:\n\
[\"mib-module\"::]\"object-name\"|\"oid\" ...\n\
mib-module: MIB name (such as SNMPv2-MIB)\n\
object-name: MIB symbol (sysDescr.0) or OID\n\
"
# Scanner
class ReadPduScannerMixIn: pass
# Parser
class ReadPduParserMixIn:
def p_varBindSpec(self, args):
'''
VarBind ::= VarName
'''
def p_paramsSpec(self, args):
'''
Params ::= VarBinds
'''
def p_pduSpec(self, args):
'''
VarBinds ::= VarBind whitespace VarBinds
VarBinds ::= VarBind
VarBinds ::=
VarName ::= ModName semicolon semicolon NodeName
VarName ::= ModName semicolon semicolon
VarName ::= semicolon semicolon NodeName
VarName ::= NodeName
ModName ::= string
NodeName ::= ObjectName ObjectIndices
ObjectName ::= string
ObjectIndices ::= ObjectIndex string ObjectIndices
ObjectIndices ::= ObjectIndex ObjectIndices
ObjectIndices ::= ObjectIndex
ObjectIndices ::=
ObjectIndex ::= quote string quote
'''
# Generator
class __ReadPduGenerator(base.GeneratorTemplate):
def n_ModName(self, cbCtx, node):
snmpEngine, ctx = cbCtx
ctx['modName'] = node[0].attr
def n_ObjectName(self, cbCtx, node):
snmpEngine, ctx = cbCtx
objectName = []
for subOid in node[0].attr.split('.'):
if not subOid:
continue
try:
objectName.append(int(subOid))
except ValueError:
objectName.append(subOid)
ctx['objectName'] = tuple(objectName)
def n_ObjectIndex(self, cbCtx, node):
snmpEngine, ctx = cbCtx
if 'objectIndices' not in ctx:
ctx['objectIndices'] = []
ctx['objectIndices'].append(node[1].attr)
def n_VarName_exit(self, cbCtx, node):
snmpEngine, ctx = cbCtx
mibViewCtl = ctx['mibViewController']
if 'modName' in ctx:
mibViewCtl.mibBuilder.loadModules(ctx['modName'])
if 'objectName' in ctx:
objectName = ctx['objectName']
else:
objectName = None
modName = ctx.get('modName', '')
if objectName:
oid, label, suffix = mibViewCtl.getNodeName(objectName, modName)
else:
oid, label, suffix = mibViewCtl.getFirstNodeName(modName)
if sys.version_info[0] < 3:
intTypes = (int, long)
else:
intTypes = (int,)
if [ x for x in suffix if not isinstance(x, intTypes) ]:
raise error.PySnmpError(
'Cant resolve object at: %s' % (suffix,)
)
modName, nodeDesc, _suffix = mibViewCtl.getNodeLocation(oid)
mibNode, = mibViewCtl.mibBuilder.importSymbols(modName, nodeDesc)
if not hasattr(self, '_MibTableColumn'):
self._MibTableColumn, = mibViewCtl.mibBuilder.importSymbols(
'SNMPv2-SMI', 'MibTableColumn'
)
if isinstance(mibNode, self._MibTableColumn):
# Table column
if 'objectIndices' in ctx:
modName, nodeDesc, _suffix = mibViewCtl.getNodeLocation(
mibNode.name[:-1]
)
mibNode, = mibViewCtl.mibBuilder.importSymbols(
modName, nodeDesc
)
suffix = suffix + mibNode.getInstIdFromIndices(
*ctx['objectIndices']
)
else:
if 'objectIndices' in ctx:
raise error.PySnmpError(
'Cant resolve indices: %s' % (ctx['objectIndices'],)
)
ctx['varName'] = oid + suffix
if 'objectName' in ctx:
del ctx['objectName']
if 'objectIndices' in ctx:
del ctx['objectIndices']
def n_VarBind_exit(self, cbCtx, node):
snmpEngine, ctx = cbCtx
if 'varBinds' not in ctx:
ctx['varBinds'] = [ (ctx['varName'], None) ]
else:
ctx['varBinds'].append((ctx['varName'], None))
del ctx['varName']
def n_VarBinds_exit(self, cbCtx, node):
snmpEngine, ctx = cbCtx
if 'varBinds' not in ctx or not ctx['varBinds']:
ctx['varBinds'] = [ ((1, 3, 6), None) ]
def readPduGenerator(cbCtx, ast):
__ReadPduGenerator().preorder(cbCtx, ast)
# Write class
def getWriteUsage():
return "\
Management parameters:\n\
<[\"mib-module\"::]\"object-name\"|\"oid\" \"type\"|\"=\" value> ...\n\
mib-module: MIB name (such as SNMPv2-MIB)\n\
object-name: MIB symbol (sysDescr.0) or OID\n\
type: MIB value type\n\
i integer\n\
u unsigned integer\n\
s string\n\
n NULL\n\
o ObjectIdentifier\n\
t TimeTicks\n\
a IP address\n\
=: use MIB for value type lookup\n\
value: value to write\n\
"
# Scanner
WritePduScannerMixIn = ReadPduScannerMixIn
# Parser
class WritePduParserMixIn(ReadPduParserMixIn):
def p_varBindSpec(self, args):
'''
VarBind ::= VarName whitespace VarType whitespace VarValue
VarType ::= string
VarValue ::= string
'''
# Generator
class __WritePduGenerator(__ReadPduGenerator):
_typeMap = {
'i': rfc1902.Integer(),
'u': rfc1902.Integer32(),
's': rfc1902.OctetString(),
'n': univ.Null(),
'o': univ.ObjectIdentifier(),
't': rfc1902.TimeTicks(),
'a': rfc1902.IpAddress()
}
def n_VarType(self, cbCtx, node):
snmpEngine, ctx = cbCtx
ctx['varType'] = node[0].attr
def n_VarValue(self, cbCtx, node):
snmpEngine, ctx = cbCtx
ctx['varValue'] = node[0].attr
def n_VarBind_exit(self, cbCtx, node):
snmpEngine, ctx = cbCtx
mibViewCtl = ctx['mibViewController']
if ctx['varType'] == '=':
modName, nodeDesc, suffix = mibViewCtl.getNodeLocation(ctx['varName'])
mibNode, = mibViewCtl.mibBuilder.importSymbols(modName, nodeDesc)
if hasattr(mibNode, 'syntax'):
MibTableColumn, = mibViewCtl.mibBuilder.importSymbols('SNMPv2-SMI', 'MibTableColumn')
if isinstance(mibNode, MibTableColumn) or suffix == (0,):
val = mibNode.syntax
else:
raise error.PySnmpError(
'Found MIB scalar %s but non-scalar given %s' %
(mibNode.name + (0,), ctx['varName'])
)
else:
raise error.PySnmpError(
'Variable %s has no syntax' % (ctx['varName'],)
)
else:
try:
val = self._typeMap[ctx['varType']]
except KeyError:
raise error.PySnmpError('unsupported SNMP value type \"%s\"' %
ctx['varType'])
try:
val = val.clone(ctx['varValue'])
except PyAsn1Error:
raise error.PySnmpError(sys.exc_info()[1])
if 'varBinds' not in ctx:
ctx['varBinds'] = [ (ctx['varName'], val) ]
else:
ctx['varBinds'].append((ctx['varName'], val))
def writePduGenerator(cbCtx, ast):
snmpEngine, ctx = cbCtx
__WritePduGenerator().preorder((snmpEngine, ctx), ast)
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