def walk(self,
snmp_config,
oid,
check_plugin_name=None,
table_base_oid=None,
context_name=None):
# type: (snmp_utils.SNMPHostConfig, str, Optional[str], Optional[str], Optional[str]) -> snmp_utils.SNMPRowInfo
if oid.startswith("."):
oid = oid[1:]
if oid.endswith(".*"):
oid_prefix = oid[:-2]
dot_star = True
else:
oid_prefix = oid
dot_star = False
path = cmk.utils.paths.snmpwalks_dir + "/" + snmp_config.hostname
console.vverbose(" Loading %s from %s\n" % (oid, path))
rowinfo = [] # type: List[Tuple[str, str]]
if snmp_config.hostname in _g_walk_cache:
lines = _g_walk_cache[snmp_config.hostname]
else:
try:
lines = open(path).readlines()
except IOError:
raise MKSNMPError("No snmpwalk file %s" % path)
_g_walk_cache[snmp_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 = self._compare_oids(oid_prefix, comp)
if hit == 0:
break
elif hit == 1: # we are too low
begin = current + 1
else:
end = current
if hit != 0:
return [] # not found
rowinfo = self._collect_until(oid, oid_prefix, lines, current, -1)
rowinfo.reverse()
rowinfo += self._collect_until(oid, oid_prefix, lines, current + 1, 1)
if dot_star:
return [rowinfo[0]]
return rowinfo
def walk(self, snmp_config, oid, check_plugin_name=None, table_base_oid=None,
context_name=None):
# type: (snmp_utils.SNMPHostConfig, str, Optional[str], Optional[str], Optional[str]) -> snmp_utils.SNMPRowInfo
protospec = self._snmp_proto_spec(snmp_config)
ipaddress = snmp_config.ipaddress
if snmp_config.is_ipv6_primary:
ipaddress = "[" + ipaddress + "]"
portspec = self._snmp_port_spec(snmp_config)
command = self._snmp_walk_command(snmp_config, context_name)
command += ["-OQ", "-OU", "-On", "-Ot", "%s%s%s" % (protospec, ipaddress, portspec), oid]
# list2cmdline exists, but mypy complains
console.vverbose("Running '%s'\n" % subprocess.list2cmdline(command)) # type: ignore
snmp_process = None
exitstatus = None
rowinfo = [] # type: snmp_utils.SNMPRowInfo
try:
snmp_process = subprocess.Popen(
command,
close_fds=True,
stdin=open(os.devnull),
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
rowinfo = self._get_rowinfo_from_snmp_process(snmp_process)
except MKTimeout:
# On timeout exception try to stop the process to prevent child process "leakage"
if snmp_process:
os.kill(snmp_process.pid, signal.SIGTERM)
snmp_process.wait()
raise
finally:
# The stdout and stderr pipe are not closed correctly on a MKTimeout
# Normally these pipes getting closed after p.communicate finishes
# Closing them a second time in a OK scenario won't hurt neither..
if snmp_process:
exitstatus = snmp_process.wait()
if snmp_process.stderr:
error = snmp_process.stderr.read()
snmp_process.stderr.close()
if snmp_process.stdout:
snmp_process.stdout.close()
if exitstatus:
console.verbose(tty.red + tty.bold + "ERROR: " + tty.normal +
"SNMP error: %s\n" % error.strip())
raise MKSNMPError(
"SNMP Error on %s: %s (Exit-Code: %d)" % (ipaddress, error.strip(), exitstatus))
return rowinfo
def _snmp_scan(host_config,
on_error="ignore",
for_inv=False,
do_snmp_scan=True,
for_mgmt_board=False):
import cmk_base.inventory_plugins as inventory_plugins
# Make hostname globally available for scan functions.
# This is rarely used, but e.g. the scan for if/if64 needs
# this to evaluate if_disabled_if64_checks.
check_api_utils.set_hostname(host_config.hostname)
snmp.initialize_single_oid_cache(host_config)
console.vverbose(" SNMP scan:\n")
if not config.get_config_cache().in_binary_hostlist(
host_config.hostname, config.snmp_without_sys_descr):
for oid, name in [(".1.3.6.1.2.1.1.1.0", "system description"),
(".1.3.6.1.2.1.1.2.0", "system object")]:
value = snmp.get_single_oid(host_config,
oid,
do_snmp_scan=do_snmp_scan)
if value is None:
raise MKSNMPError(
"Cannot fetch %s OID %s. This might be OK for some bogus devices. "
"In that case please configure the ruleset \"Hosts without system "
"description OID\" to tell Check_MK not to fetch the system "
"description and system object OIDs." % (name, oid))
else:
# Fake OID values to prevent issues with a lot of scan functions
console.vverbose(
" Skipping system description OID "
"(Set .1.3.6.1.2.1.1.1.0 and .1.3.6.1.2.1.1.2.0 to \"\")\n")
snmp.set_single_oid_cache(host_config, ".1.3.6.1.2.1.1.1.0", "")
snmp.set_single_oid_cache(host_config, ".1.3.6.1.2.1.1.2.0", "")
found_check_plugin_names = []
if for_inv:
items = inventory_plugins.inv_info.items()
else:
items = config.check_info.items()
positive_found = []
default_found = []
for check_plugin_name, _unused_check in items:
if config.service_ignored(host_config.hostname, check_plugin_name,
None):
continue
else:
if for_inv and not inventory_plugins.is_snmp_plugin(
check_plugin_name):
continue
elif not for_inv and not cmk_base.check_utils.is_snmp_check(
check_plugin_name):
continue
section_name = cmk_base.check_utils.section_name_of(check_plugin_name)
# The scan function should be assigned to the section_name, because
# subchecks sharing the same SNMP info of course should have
# an identical scan function. But some checks do not do this
# correctly
if check_plugin_name in config.snmp_scan_functions:
scan_function = config.snmp_scan_functions[check_plugin_name]
elif section_name in config.snmp_scan_functions:
scan_function = config.snmp_scan_functions[section_name]
elif section_name in inventory_plugins.inv_info:
scan_function = inventory_plugins.inv_info[section_name].get(
"snmp_scan_function")
else:
scan_function = None
if scan_function:
try:
def oid_function(oid,
default_value=None,
cp_name=check_plugin_name):
value = snmp.get_single_oid(host_config,
oid,
cp_name,
do_snmp_scan=do_snmp_scan)
return default_value if value is None else value
result = scan_function(oid_function)
if result is not None and not isinstance(result, (str, bool)):
if on_error == "warn":
console.warning(
" SNMP scan function of %s returns invalid type %s."
% (check_plugin_name, type(result)))
elif on_error == "raise":
raise MKGeneralException("SNMP Scan aborted.")
elif result:
found_check_plugin_names.append(check_plugin_name)
positive_found.append(check_plugin_name)
except MKGeneralException:
# some error messages which we explicitly want to show to the user
# should be raised through this
raise
except Exception:
if on_error == "warn":
console.warning(
" Exception in SNMP scan function of %s" %
check_plugin_name)
elif on_error == "raise":
raise
else:
found_check_plugin_names.append(check_plugin_name)
default_found.append(check_plugin_name)
_output_snmp_check_plugins("SNMP scan found", positive_found)
if default_found:
_output_snmp_check_plugins("SNMP without scan function", default_found)
filtered = config.filter_by_management_board(host_config.hostname,
found_check_plugin_names,
for_mgmt_board,
for_discovery=True,
for_inventory=for_inv)
_output_snmp_check_plugins("SNMP filtered check plugin names", filtered)
snmp.write_single_oid_cache(host_config)
return sorted(filtered)