MIB tweaks

Waive MIB lookup

Perform SNMP GETNEXT operation with the following options:

• with SNMPv2c, community ‘public’
• over IPv4/UDP
• to an Agent at demo.snmplabs.com:161
• for an OID in string form
• do not resolve request/response OIDs and values from/toto human-friendly form

The lookupMib=False keyword argument makes pysnmp NOT resolving request and response variable-bindings from/to human-friendly form.

Functionally similar to:

$ snmpwalk -v2c -c public -ObentU demo.snmplabs.com 1.3.6.1.2.1

from pysnmp.hlapi import *

iterator = nextCmd(
    SnmpEngine(),
    CommunityData('public'),
    UdpTransportTarget(('demo.snmplabs.com', 161)),
    ContextData(),
    ObjectType(ObjectIdentity('1.3.6.1.2.1.1')),
    lookupMib=False
)

for errorIndication, errorStatus, errorIndex, varBinds in iterator:

    if errorIndication:
        print(errorIndication)
        break

    elif errorStatus:
        print('%s at %s' % (errorStatus.prettyPrint(),
                            errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
        break

    else:
        for varBind in varBinds:
            print(' = '.join([x.prettyPrint() for x in varBind]))

Download script.

Preload PySNMP MIBs

Send a series of SNMP GETNEXT requests using the following options:

• with SNMPv3 with user ‘usr-md5-des’, MD5 auth and DES privacy protocols
• over IPv4/UDP
• to an Agent at demo.snmplabs.com:161
• for all OIDs starting from 1.3.6
• preload all Python MIB modules found in search path

Functionally similar to:

$ snmpwalk -v3 -l authPriv -u usr-md5-des -A authkey1 -X privkey1 -m ALL demo.snmplabs.com:161 1.3.6

from pysnmp.hlapi import *

iterator = nextCmd(
    SnmpEngine(),
    UsmUserData('usr-md5-des', 'authkey1', 'privkey1'),
    UdpTransportTarget(('demo.snmplabs.com', 161)),
    ContextData(),
    ObjectType(ObjectIdentity('1.3.6').loadMibs())
)

for errorIndication, errorStatus, errorIndex, varBinds in iterator:

    if errorIndication:
        print(errorIndication)
        break

    elif errorStatus:
        print('%s at %s' % (errorStatus.prettyPrint(),
                            errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
        break

    else:
        for varBind in varBinds:
            print(' = '.join([x.prettyPrint() for x in varBind]))

Download script.

Custom ASN.1 MIB path

Send SNMP GET request using the following options:

• with SNMPv2c, community ‘public’
• over IPv4/UDP
• to an Agent at demo.snmplabs.com:161
• for IF-MIB::ifInOctets.1 MIB object
• pass non-default ASN.1 MIB source to MIB compiler

Functionally similar to:

$ snmpget -v2c -c public -M /usr/share/snmp demo.snmplabs.com IF-MIB::ifInOctets.1

from pysnmp.hlapi import *

iterator = getCmd(
    SnmpEngine(),
    CommunityData('public'),
    UdpTransportTarget(('demo.snmplabs.com', 161)),
    ContextData(),
    ObjectType(
        ObjectIdentity(
            'IF-MIB', 'ifInOctets', 1
        ).addAsn1MibSource(
            'file:///usr/share/snmp',
            'http://mibs.snmplabs.com/asn1/@mib@'
        )
    )
)

errorIndication, errorStatus, errorIndex, varBinds = next(iterator)

if errorIndication:
    print(errorIndication)

elif errorStatus:
    print('%s at %s' % (errorStatus.prettyPrint(),
                        errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))

else:
    for varBind in varBinds:
        print(' = '.join([x.prettyPrint() for x in varBind]))

Download script.

Custom PySNMP MIBs location

Send a series of SNMP GETBULK requests using the following options:

• with SNMPv3, user ‘usr-none-none’, no authentication, no privacy
• over IPv4/UDP
• to an Agent at demo.snmplabs.com:161
• for all OIDs within TCP-MIB::tcpConnTable column
• TCP-MIB Python module will be searched by a user-specified filesystem path (/opt/mib/pysnmp) and in Python package (python_packaged_mibs) which should be in sys.path. If not found, TCP-MIB will be downloaded from the web, compiled into Python and cached for further use.

Functionally similar to:

$ snmpbulkwalk -v3 -lnoAuthNoPriv -u usr-none-none -Cn0 -Cr50 demo.snmplabs.com TCP-MIB::tcpConnTable

from pysnmp.hlapi import *

iterator = bulkCmd(
    SnmpEngine(),
    UsmUserData('usr-none-none'),
    UdpTransportTarget(('demo.snmplabs.com', 161)),
    ContextData(),
    0, 50,
    ObjectType(
        ObjectIdentity(
            'TCP-MIB', 'tcpConnTable'
        ).addMibSource(
            '/opt/mibs/pysnmp'
        ).addMibSource(
            'python_packaged_mibs'
        )
    ).addAsn1MibSource('http://mibs.snmplabs.com/asn1/@mib@'),
    lexicographicMode=False
)

for errorIndication, errorStatus, errorIndex, varBinds in iterator:

    if errorIndication:
        print(errorIndication)
        break

    elif errorStatus:
        print('%s at %s' % (errorStatus.prettyPrint(),
                            errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
        break

    else:
        for varBind in varBinds:
            print(' = '.join([x.prettyPrint() for x in varBind]))

Download script.

See also: library reference.