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topotests: lib, fix filter out "At line 73 in /usr/share/snmp/mibs/ietf/SNMPv2-PDU" message

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When testing SNMP service on FRR, the following error message may
appear on some distros.

> # snmpwalk -v2c -c public .1.3.6 1.1.1.1 <OID>
> Bad operator (INTEGER): At line 73 in /usr/share/snmp/mibs/ietf/SNMPv2-PDU
> [..then result ..]
>

The error message is due to the /etc/snmp/snmp.conf file. By default, this
file is used by both snmp server and client side. The net-snmp MIB parsing
routing loads MIBS, to bind oids with the naming scheme used by the MIBS.

> # cat /etc/frr/snmp.conf
> [snmp]
> mibs +ALL
>

A potential fix would consist in modifying the SNMPv2-PDU.mib file: the
problem is known on ubuntu distros, as the snmp-mibs-downloader package
has not updated the SNMPv2-PDU.mib file.

The choice is done to not modify the original distro where the test is run
on. Fix the topotests by ignoring the 'SNMPv2-PDU line 73" error message, and
keep the other error messages that may happen, for instance, when an
unknown oid name value is requested.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2024-04-15 14:12:23 +02:00
parent a4e60f3399
commit 5e7bb79f11
1 changed files with 9 additions and 4 deletions
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13
tests/topotests/lib/snmptest.py
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@ -85,15 +85,18 @@ class SnmpTester(object):
return out_dict, out_list return out_dict, out_list
def get(self, oid): def get(self, oid):
cmd = "snmpget {0} {1}".format(self._snmp_config(), oid) cmd = "snmpget {0} {1} 2>&1 | grep -v SNMPv2-PDU".format(
self._snmp_config(), oid
)
result = self.router.cmd(cmd) result = self.router.cmd(cmd)
if "not found" in result: if "not found" in result:
return None return None
return self._get_snmp_value(result) return self._get_snmp_value(result)
def get_next(self, oid): def get_next(self, oid):
cmd = "snmpgetnext {0} {1}".format(self._snmp_config(), oid) cmd = "snmpgetnext {0} {1} 2>&1 | grep -v SNMPv2-PDU".format(
self._snmp_config(), oid
)
result = self.router.cmd(cmd) result = self.router.cmd(cmd)
print("get_next: {}".format(result)) print("get_next: {}".format(result))
@ -102,7 +105,9 @@ class SnmpTester(object):
return self._get_snmp_value(result) return self._get_snmp_value(result)
def walk(self, oid): def walk(self, oid):
cmd = "snmpwalk {0} {1}".format(self._snmp_config(), oid) cmd = "snmpwalk {0} {1} 2>&1 | grep -v SNMPv2-PDU".format(
self._snmp_config(), oid
)
result = self.router.cmd(cmd) result = self.router.cmd(cmd)
return self._parse_multiline(result) return self._parse_multiline(result)