Some LLDP information needs to be base64/hex decoded

The values of 'rem-lldp-chassis-id' and 'rem-lldp-port-id' from show lldp neighbors (and show lldp neighbors detail) are encoded when piped through display-xml. The current LLDP parsing code is not accounting for this and is returning the encoded strings and not the plaintext values.

'rem-lldp-chassis-id-subtype' and 'rem-lldp-port-subtype' indicate what type of value is encoded in their respective fields. So far I've encountered the following subtype values:

interface-name
mac-address
local

The types 'interface-name' and 'local' need to be base64 decoded. Base64 decoding 'mac-address' gives the numeric hex value of the MAC, which then needs to be converted to plaintext.

For the example below, in the XML output 'rem-lldp-chassis-id' needs to be base64 decoded, and 'rem-lldp-port-id''needs to be base64 decoded, and then converted from raw hex values.

# show lldp neighbors interface ethernet 1/1/7:1
Loc PortID          Rem Host Name        Rem Port Id                    Rem Chassis Id
--------------------------------------------------------------------------------------
ethernet1/1/7:1     ESX1                 a0:36:9f:df:ac:26             vmnic5

# show lldp neighbors interface ethernet 1/1/7:1 | display-xml
<?xml version="1.0" encoding="UTF-8"?>
<rpc-reply>
  <data>
    <global-params>
      <enable>true</enable>
      <tx-interval>30</tx-interval>
      <txhold-multiplier>4</txhold-multiplier>
...snip
      <virtual-ipv6>false</virtual-ipv6>
    </global-params>
    <interfaces-state>
      <interface>
        <name>ethernet1/1/7:1</name>
        <lldp-rem-neighbor-info>
          <info>
            <rem-lldp-time-mark>52797100</rem-lldp-time-mark>
            <rem-lldp-index>36</rem-lldp-index>
            <dest-mac-addr-index>1</dest-mac-addr-index>
            <rem-if-index>0</rem-if-index>
            <rem-local-port-num>1224</rem-local-port-num>
            <rem-lldp-chassis-id>dm1uaWM1</rem-lldp-chassis-id>
            <rem-lldp-port-id>oDaf36wm</rem-lldp-port-id>
            <rem-lldp-chassis-id-subtype>interface-name</rem-lldp-chassis-id-subtype>
            <rem-lldp-port-subtype>mac-address</rem-lldp-port-subtype>
            <rem-ttl>180</rem-ttl>
            <rem-last-update-time>332607</rem-last-update-time>
            <rem-info-valid-time>172</rem-info-valid-time>
            <rem-system-desc>VMware ESXi Releasebuild-17325551</rem-system-desc>
            <rem-port-desc>port 33 on dvSwitch DSwitch (cswitch)</rem-port-desc>
            <rem-system-name>ESX1</rem-system-name>
            <rem-max-frame-size>0</rem-max-frame-size>
            <rem-agg-link-status>false</rem-agg-link-status>
            <rem-sys-cap-supported>bridge</rem-sys-cap-supported>
            <rem-sys-cap-enabled>bridge</rem-sys-cap-enabled>
            <rem-remote-changes>false</rem-remote-changes>
            <rem-too-many-neighbors>false</rem-too-many-neighbors>
            <rem-dot3-auto-neg-supported>false</rem-dot3-auto-neg-supported>
            <rem-dot3-auto-neg-enabled>false</rem-dot3-auto-neg-enabled>
            <rem-dot3-auto-neg-adv-cap/>
          </info>
        </lldp-rem-neighbor-info>
 ...snip
        </lldp-med-remote-data>
      </interface>
    </interfaces-state>
  </data>
</rpc-reply>

'rem-lldp-chassis-id': base64decode('dm1uaWM1') -> vmnic5

'rem-lldp-port-id': hex2ascii(base64decode('oDaf36wm')) -> A0369FDFAC26

Switch information:

# show version
Dell EMC Networking OS10 Enterprise
Copyright (c) 1999-2020 by Dell Inc. All Rights Reserved.
OS Version: 10.5.2.2
Build Version: 10.5.2.2.258
Build Time: 2020-12-12T02:56:02+0000
System Type: S5224F-ON
Architecture: x86_64
Up Time: 1 week 2 days 23:15:43

napalm-automation-community / napalm-dellos10

Some LLDP information needs to be base64/hex decoded #33