def _perform_snmpwalk(snmp_config, check_plugin_name, base_oid, fetchoid):
# type: (SNMPHostConfig, CheckPluginName, OID, OID) -> SNMPRowInfo
added_oids = set([]) # type: Set[OID]
rowinfo = [] # type: SNMPRowInfo
for context_name in snmp_config.snmpv3_contexts_of(check_plugin_name):
rows = SNMPBackendFactory.walk(snmp_config,
oid=fetchoid,
check_plugin_name=check_plugin_name,
table_base_oid=base_oid,
context_name=context_name)
# I've seen a broken device (Mikrotik Router), that broke after an
# update to RouterOS v6.22. It would return 9 time the same OID when
# .1.3.6.1.2.1.1.1.0 was being walked. We try to detect these situations
# by removing any duplicate OID information
if len(rows) > 1 and rows[0][0] == rows[1][0]:
console.vverbose(
"Detected broken SNMP agent. Ignoring duplicate OID %s.\n" %
rows[0][0])
rows = rows[:1]
for row_oid, val in rows:
if row_oid in added_oids:
console.vverbose("Duplicate OID found: %s (%r)\n" %
(row_oid, val))
else:
rowinfo.append((row_oid, val))
added_oids.add(row_oid)
return rowinfo
def walk_for_export(snmp_config, oid):
# type: (SNMPHostConfig, OID) -> SNMPRowInfoForStoredWalk
rows = SNMPBackendFactory.walk(snmp_config, use_cache=False, oid=oid)
return _convert_rows_for_stored_walk(rows)