clientName is not resolved from hosts file within the csv-client logger

[immanuelfodor]

Description

Happy holidays!

I have configured a hosts file listing all clients on my LAN. Their name resolution works fine as expected but the generated csv-client log contains only IP addresses in place of the clientName field (all default fields are logged).

$ cat logs/2025-12-25_192_168_1_11.log
2025-12-25 04:36:02     192.168.1.11    192.168.1.11    0       BLOCKED (custom)        ping.ui.com.    A (0.0.0.0)     NOERROR BLOCKED A       blocky
2025-12-25 10:36:02     192.168.1.11    192.168.1.11    0       BLOCKED (custom)        ping.ui.com.    A (0.0.0.0)     NOERROR BLOCKED A       blocky
2025-12-25 16:36:02     192.168.1.11    192.168.1.11    0       BLOCKED (custom)        ping.ui.com.    A (0.0.0.0)     NOERROR BLOCKED A       blocky
# Unexpected 2nd client IP instead of clientName in the logs

# But name resolution works fine, so I assume the clientName could be in the logs too
$ blocky query unifi
[2025-12-25 18:17:12]  INFO Query result for 'unifi' (A):
[2025-12-25 18:17:12]  INFO     reason:                  HOSTS FILE
[2025-12-25 18:17:12]  INFO     response type:            HOSTSFILE
[2025-12-25 18:17:12]  INFO     response:          A (192.168.1.11)
[2025-12-25 18:17:12]  INFO     return code:                NOERROR

Expected result

When using the csv-client logger along with hosts file(s), the clientName log attribute is resolved from the hosts file.
If possible, I'd also prefer to have the clientName as part of the log file name instead of the IP address for easy identification:

- 2025-12-25_192_168_1_11.log
+ 2025-12-25_unifi.log

Additional info

Blocky version (latest):

• Version: v0.28.2
• Build time: 20251117-212247
• Architecture: amd64

[immanuelfodor]

Found a workaround: when there are no other name servers (eg. router) for rDNS, localhost (i.e. Blocky itself) can act as the name source. I don't know how ugly this workaround is, but it works 😅 Now client names are filled as expected in the logs and the file names are also created accordingly.

clientLookup:
  upstream: 127.0.0.1
  singleNameOrder:
    - 2
    - 1

[immanuelfodor]

Note: I'd still prefer using the direct hosts file approach for getting the client name in-memory, as now Blocky is poisoning/spamming its low localhost for file with tons of PTR entries 😵‍💫

[immanuelfodor]

Sometimes Blocky goes berserk and bombards itself with PTR requests for 127.0.0.1 record. The situation is so bad that its csv-client log writer cannot even keep up, and outputs an error that it can't log the queries. It seems the spikes are at every 2 hours.