Inventory plugin not matching even if detection is disabled (matches all hosts)

Checkmk Exchange
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1

Hi there,

on my 2.0.0p15 I try to write an inventory plugin to get all VLANs on a Zyxel switch. For this I copied the inv_cisco_vlan.py file as a base and modified the OIDs.
Now I have something like an inventory check but it seems that my plugin is not used at all.

The plugin:

from .agent_based_api.v1 import (
    contains,
    exists,
    OIDEnd,
    register,
    SNMPTree,
    TableRow,
)

from .agent_based_api.v1.type_defs import (
    InventoryResult,
)

register.snmp_section(
    name = "inv_zyxel_vlans",
    detect=exists(".1.3.6.1.2.1.1.1.0"),
    fetch = [
        SNMPTree(
            base=".1.3.6.1.2.1.17.7.1.4.3.1",
            oids=[
                OIDEnd(),
                "1",  # VlanName
                "5",  # VlanRowStatus
                "4",  # VlanUntaggedPorts
                "2",  # VlanTaggedPorts
            ],
        ),
    ],
)


def inventory_zyxel_vlans(section) -> InventoryResult:
    import pprint;
    pprint.pprint("Section!")
    pprint.pprint(section)
    # print (info)
    return [ (None, None) ]

    path = ["networking", "interfaces"]
    map_vlans = {
        '1': 'static',
        '2': 'dynamic',
        '3': 'multi-VLAN',
    }

    for if_id, vlan_type, vlan_single, vlan_multi in section[0]:
        vlan_readable = map_vlans.get(vlan_type, "")
        vlans = None
        if vlan_single != '0' and vlan_type in ['1', '2']:
            vlans = vlan_single
        elif vlan_type == '3':
            vlans = parse_multi_vlan(vlan_multi)

        if vlans:
            yield TableRow(
                path=path,
                key_columns={"index": int(if_id)},
                inventory_columns={
                    "vlans": vlans,
                    "vlantype": vlan_readable,
                },
            )


register.inventory_plugin(
    name='inv_zyxel_vlans',
    inventory_function=inventory_zyxel_vlans,
)

The commandline for checking:

 cmk -IInv --debug --detect-plugins=inv_zyxel_vlans HOSTNAME

The output is:

Discovering services and host labels on: HOSTNAME
HOSTNAME:
+ FETCHING DATA
[SNMPFetcher] Execute data source
No piggyback files for 'HOSTNAME'. Skip processing.
No piggyback files for '192.168.22.250'. Skip processing.
[PiggybackFetcher] Execute data source
+ PARSE FETCHER RESULTS
Received no piggyback data
+ EXECUTING HOST LABEL DISCOVERY
+ PERFORM HOST LABEL DISCOVERY
+ EXECUTING DISCOVERY PLUGINS (0)
SUCCESS - Found no services, no host labels

I have no idea why this shows no output at all. I also tried with -vv but there is nothing related to my plugin and also no error message.

Can anybody tell me what I am doing wrong?

Kind regards

Sebastian

2

“-II” is only relevant for check plugins. You need to do a “-i” for HW/SW inventory.
I would also omit the “–detect-plugins” as you need to know if your inventory plugin is found automatically or not.

1 Like
3

if you want this for Zyxel only you should be more specific here. At the moment this matches more ore less every system.

This will only match Zyxel devices

detect=startswith(".1.3.6.1.2.1.1.2.0", ".1.3.6.1.4.1.890"),`

This OID is not Zyxel specific (dot1qVlanStaticTable), so you might change this to a common vlan addon.

1 Like
4

Thanks a lot

I knew something was off but I couldnt see it. I will put it on Exchange after finalizing it.

cu

Sebastian

5

Hi thl-cmk,

I know this is not Zyxel relevant and I will modify the name and purpose to show this. My problem was that the inventory routine was not executed and andreas showed my mistake

Thx

Sebastian