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Diffstat (limited to 'examples/smi/manager/convert-between-pdu-varbinds-and-mib-objects.py')
-rw-r--r-- | examples/smi/manager/convert-between-pdu-varbinds-and-mib-objects.py | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/examples/smi/manager/convert-between-pdu-varbinds-and-mib-objects.py b/examples/smi/manager/convert-between-pdu-varbinds-and-mib-objects.py new file mode 100644 index 00000000..ecc798d3 --- /dev/null +++ b/examples/smi/manager/convert-between-pdu-varbinds-and-mib-objects.py @@ -0,0 +1,104 @@ +""" +SNMP var-binds MIB resolution ++++++++++++++++++++++++++++++ + +This script explains how Python application (typically pysnmp-based +SNMP Manager) could turn SNMP PDU variable-bindings into MIB objects +or the other way around. + +The code below does not explicitly add MIB compiler - that happens +behind the scenes. Examples below try to demo different kinds +of MIB objects to work with. +"""# +from pysnmp.smi import builder, view, rfc1902, error + +# MIB Builder manages pysnmp MIBs +mibBuilder = builder.MibBuilder() + +# MIB View Controller implements various queries to loaded MIBs +mibView = view.MibViewController(mibBuilder) + +# Obtain MIB object information by MIB object name +mibVar = rfc1902.ObjectIdentity('IF-MIB', 'ifInOctets', 1) + +# Optionally attach PySMI MIB compiler to MIB Builder that would +# create pysnmp MIBs on demand from ASN.1 sources downloaded from +# a web site. +try: + mibVar.addAsn1MibSource('http://mibs.snmplabs.com/asn1/@mib@') +except error.SmiError: + print('WARNING: not using MIB compiler (PySMI not installed)') + +mibVar.resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Obtain MIB object information by its [sequence] OID +mibVar = rfc1902.ObjectIdentity(tuple(mibVar)).resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Obtain MIB object information by its [string] OID +mibVar = rfc1902.ObjectIdentity(str(mibVar)).resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Obtain MIB object information by a mix of OID/label parts +mibVar = rfc1902.ObjectIdentity((1, 3, 6, 1, 2, 'mib-2', 1, 'sysDescr')).resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Obtain MIB object information by a label +mibVar = rfc1902.ObjectIdentity('iso.org.dod.internet.mgmt.mib-2.system.sysDescr').resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Obtain the first MIB object in given MIB module +mibVar = rfc1902.ObjectIdentity('SNMPv2-MIB').resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Obtain the last MIB object in given MIB module +mibVar = rfc1902.ObjectIdentity('SNMPv2-MIB', last=True).resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Another way to obtain the first (or last) symbol in MIB module +mibVar = rfc1902.ObjectIdentity('SNMPv2-MIB', '').resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Obtain MIB symbol from whatever MIB it is defined at (MIB should be loaded) +mibVar = rfc1902.ObjectIdentity('', 'sysDescr', 0).resolveWithMib(mibView) + +print(mibVar.prettyPrint(), tuple(mibVar), str(mibVar)) + +# Create an OID-value pair (called variable-binding in SNMP) +varBind = rfc1902.ObjectType( + rfc1902.ObjectIdentity('SNMPv2-MIB', 'sysObjectID', 0), '1.3.6.1' +).resolveWithMib(mibView) + +print(varBind[0].prettyPrint(), varBind[1].__class__.__name__, varBind[1].prettyPrint()) + +# Create just OID +varBind = rfc1902.ObjectType( + rfc1902.ObjectIdentity('SNMPv2-MIB', 'sysObjectID', 0) +).resolveWithMib(mibView) + +print(varBind[0].prettyPrint(), varBind[1].__class__.__name__, varBind[1].prettyPrint()) + +# Create var-binds from MIB notification object (without OBJECTS clause) +varBinds = rfc1902.NotificationType( + rfc1902.ObjectIdentity('SNMPv2-MIB', 'coldStart') +).resolveWithMib(mibView) + +print(['%s = %s(%s)' % (x[0].prettyPrint(), x[1].__class__.__name__, x[1].prettyPrint()) for x in varBinds]) + +# Create var-binds from MIB notification object (with OBJECTS clause) +varBinds = rfc1902.NotificationType( + rfc1902.ObjectIdentity('IF-MIB', 'linkUp'), + instanceIndex=(1,), + objects={('IF-MIB', 'ifOperStatus'): 'down'} +).resolveWithMib(mibView) + +print(varBinds.prettyPrint()) |