def get(self,
oid: OID,
context_name: Optional[SNMPContextName] = None) -> Optional[SNMPRawValue]:
if oid.endswith(".*"):
oid_prefix = oid[:-2]
commandtype = "getnext"
else:
oid_prefix = oid
commandtype = "get"
protospec = self._snmp_proto_spec()
ipaddress = self.config.ipaddress
if self.config.is_ipv6_primary:
ipaddress = "[" + ipaddress + "]"
portspec = self._snmp_port_spec()
command = (
self._snmp_base_command(commandtype, context_name) +
["-On", "-OQ", "-Oe", "-Ot",
"%s%s%s" % (protospec, ipaddress, portspec), oid_prefix])
console.vverbose("Running '%s'\n" % subprocess.list2cmdline(command))
snmp_process = subprocess.Popen(
command,
close_fds=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
encoding="utf-8",
)
exitstatus = snmp_process.wait()
if snmp_process.stderr is None or snmp_process.stdout is None:
raise TypeError()
if exitstatus:
console.verbose(tty.red + tty.bold + "ERROR: " + tty.normal + "SNMP error\n")
console.verbose(snmp_process.stderr.read() + "\n")
return None
line = snmp_process.stdout.readline().strip()
if not line:
console.verbose("Error in response to snmpget.\n")
return None
parts = line.split("=", 1)
if len(parts) != 2:
return None
item = parts[0]
value = parts[1].strip()
console.vverbose("SNMP answer: ==> [%s]\n" % value)
if value.startswith('No more variables') or \
value.startswith('End of MIB') or \
value.startswith('No Such Object available') or \
value.startswith('No Such Instance currently exists'):
return None
# In case of .*, check if prefix is the one we are looking for
if commandtype == "getnext" and not item.startswith(oid_prefix + "."):
return None
return strip_snmp_value(value)
def walk(
self,
oid: OID,
section_name: Optional[SectionName] = None,
table_base_oid: Optional[OID] = None,
context_name: Optional[SNMPContextName] = None,
) -> SNMPRowInfo:
if oid.startswith("."):
oid = oid[1:]
if oid.endswith(".*"):
oid_prefix = oid[:-2]
dot_star = True
else:
oid_prefix = oid
dot_star = False
host_cache = snmp_cache.host_cache()
try:
lines = host_cache[self.config.hostname]
except KeyError:
path = cmk.utils.paths.snmpwalks_dir + "/" + self.config.hostname
console.vverbose(" Loading %s from %s\n" % (oid, path))
try:
lines = StoredWalkSNMPBackend.read_walk_data(path)
except IOError:
raise MKSNMPError("No snmpwalk file %s" % path)
host_cache[self.config.hostname] = lines
begin = 0
end = len(lines)
hit = None
while end - begin > 0:
current = (begin + end) // 2
parts = lines[current].split(None, 1)
comp = parts[0]
hit = StoredWalkSNMPBackend._compare_oids(oid_prefix, comp)
if hit == 0:
break
if hit == 1: # we are too low
begin = current + 1
else:
end = current
if hit != 0:
return [] # not found
rowinfo = StoredWalkSNMPBackend._collect_until(oid, oid_prefix, lines,
current, -1)
rowinfo.reverse()
rowinfo += StoredWalkSNMPBackend._collect_until(
oid, oid_prefix, lines, current + 1, 1)
if dot_star:
return [rowinfo[0]]
return rowinfo
def walk(self,
oid: OID,
check_plugin_name: Optional[CheckPluginNameStr] = None,
table_base_oid: Optional[OID] = None,
context_name: Optional[SNMPContextName] = None) -> SNMPRowInfo:
if oid.startswith("."):
oid = oid[1:]
if oid.endswith(".*"):
oid_prefix = oid[:-2]
dot_star = True
else:
oid_prefix = oid
dot_star = False
if snmp_cache.host_cache_contains(self.config.hostname):
lines = snmp_cache.host_cache_get(self.config.hostname)
else:
path = cmk.utils.paths.snmpwalks_dir + "/" + self.config.hostname
console.vverbose(" Loading %s from %s\n" % (oid, path))
try:
lines = open(path).readlines()
except IOError:
raise MKSNMPError("No snmpwalk file %s" % path)
snmp_cache.host_cache_set(self.config.hostname, lines)
begin = 0
end = len(lines)
hit = None
while end - begin > 0:
current = (begin + end) // 2
# skip over values including newlines to the next oid
while not lines[current].startswith(".") and current < end:
current += 1
parts = lines[current].split(None, 1)
comp = parts[0]
hit = StoredWalkSNMPBackend._compare_oids(oid_prefix, comp)
if hit == 0:
break
if hit == 1: # we are too low
begin = current + 1
else:
end = current
if hit != 0:
return [] # not found
rowinfo = StoredWalkSNMPBackend._collect_until(oid, oid_prefix, lines,
current, -1)
rowinfo.reverse()
rowinfo += StoredWalkSNMPBackend._collect_until(
oid, oid_prefix, lines, current + 1, 1)
if dot_star:
return [rowinfo[0]]
return rowinfo
def get(self,
oid: OID,
context_name: Optional[SNMPContextName] = None) -> Optional[SNMPRawValue]:
walk = self.walk(oid)
# get_stored_snmpwalk returns all oids that start with oid but here
# we need an exact match
if len(walk) == 1 and oid == walk[0][0]:
return walk[0][1]
if oid.endswith(".*") and len(walk) > 0:
return walk[0][1]
return None
