[Dnsmasq-discuss] filter-rr does not work as documentation describes

[gresser at riseup.net]

https://dnsmasq.org/docs/dnsmasq-man.html 's "filter-rr" section says 2
things:

1. "Remove records of the specified type(s) from answers."
2. "filter-rr=ANY has a special meaning: it filters replies to queries
for type ANY. Everything other than A, AAAA, MX and CNAME records are
removed."

Well, both behavior described in documentation does not appear working.


> "Remove records of the specified type(s) from answers."

"PTR" is not filtered.
I added "filter-rr=TXT,MX,HTTPS,SRV,PTR" and restarted dnsmasq.

- "TXT" requests still got send but correctly removed (EDE: 17
(Filtered))
query[TXT] eicar.org from 127.0.0.1
forwarded eicar.org to 8.8.8.8#53

- BUT, "PTR" doesn't get filtered by dnsmasq.
ANSWER SECTION: <-- no EDE Filtered


> filter-rr=ANY

I was expecting "Everything other than A, AAAA, MX and CNAME records are
removed" like you said in documentation.

- "dig eicar.org MX" returns (expected as described)
eicar.org.              86400   IN      MX      10
mail017.webhosting.manitu.net.
- Type TXT: "dig github.org TXT" returns
github.com.             3600    IN      TXT    
"docusign=087098e3-3d46-47b7-9b4e-8a23028154cd"
- Type PTR: "dig 1.1.1.1.in-addr.arpa" also returned answer.

> Conclusion

Why I can't block PTR, and why ANY doesn't working as advertised?

# dpkg --list|grep dnsmasq
ii  dnsmasq                               2.91-1+deb13u1                
      all          Small caching DNS proxy and DHCP/TFTP server - system
daemon
ii  dnsmasq-base                          2.91-1+deb13u1                
      amd64        Small caching DNS proxy and DHCP/TFTP server -
executable