def cache_oids(backend):
# Cache OIDs to avoid actual SNMP I/O.
snmp_cache.initialize_single_oid_cache(backend.config)
snmp_cache.set_single_oid_cache(snmp_scan.OID_SYS_DESCR, "sys description")
snmp_cache.set_single_oid_cache(snmp_scan.OID_SYS_OBJ, "sys object")
yield
snmp_cache._clear_other_hosts_oid_cache(backend.hostname)
def _snmp_scan_cache_description(
binary_host: bool,
*,
backend: ABCSNMPBackend,
) -> None:
if not binary_host:
for oid, name in [
(OID_SYS_DESCR, "system description"),
(OID_SYS_OBJ, "system object"),
]:
value = snmp_modes.get_single_oid(
oid,
backend=backend,
)
if value is None:
raise MKSNMPError(
"Cannot fetch %s OID %s. Please check your SNMP "
"configuration. Possible reason might be: Wrong credentials, "
"wrong SNMP version, Firewall rules, etc." % (name, oid),)
else:
# Fake OID values to prevent issues with a lot of scan functions
console.vverbose(
" Skipping system description OID "
'(Set %s and %s to "")\n',
OID_SYS_DESCR,
OID_SYS_OBJ,
)
snmp_cache.set_single_oid_cache(OID_SYS_DESCR, "")
snmp_cache.set_single_oid_cache(OID_SYS_OBJ, "")
def test_snmp_scan_cache_description__oid_missing(oid, backend):
snmp_cache.set_single_oid_cache(oid, None)
with pytest.raises(snmp_scan.MKSNMPError, match=r"Cannot fetch [\w ]+ OID %s" % oid):
snmp_scan._snmp_scan_cache_description(
False,
do_snmp_scan=False,
backend=backend,
)
def _fake_description_object() -> None:
"""Fake OID values to prevent issues with a lot of scan functions"""
console.vverbose(
" Skipping system description OID "
'(Set %s and %s to "")\n',
OID_SYS_DESCR,
OID_SYS_OBJ,
)
snmp_cache.set_single_oid_cache(OID_SYS_DESCR, "")
snmp_cache.set_single_oid_cache(OID_SYS_OBJ, "")
def test_snmp_scan_prefetch_description_object__oid_missing(oid, backend):
snmp_cache.set_single_oid_cache(oid, None)
with pytest.raises(snmp_scan.MKSNMPError,
match=r"Cannot fetch [\w ]+ OID %s" % oid):
snmp_scan._prefetch_description_object(backend=backend)