While setting up an sshcollector, I found that the script doesn't handle an
arpless device very gracefully. The log looks like:
[46567] 2018-04-10 16:59:08 warn WARNING: no entries received from <IP>
Can't use string ("1") as an ARRAY ref while "strict refs" in use at perl5/bin/netdisco-sshcollector line 114, <__ANONIO__> line 3.
This is fixed by making the process function always return the expected
structure, even if it's empty. After this error, the following errors showed
up:
[53232] 2018-04-10 17:06:15 warn WARNING: no entries received from <IP>
[53210] 2018-04-10 17:06:15 info [134.71.0.126] arpnip - retrieved 0 entries
Use of uninitialized value in sprintf at perl5/bin/netdisco-sshcollector line 119, <__ANONIO__> line 3.
[53210] 2018-04-10 17:06:15 info arpnip - processed ARP Cache entries from 1 devices
This is because $stats{entry} only becomes an integer by being incremented, so
if there aren't any entries, it never exists. This is fixed by starting it at 0.
