[Dnsmasq-discuss] use-stale-cache may failed to refresh record from certain upstream

[Simon Kelley]

On 30/04/2023 20:42, Justin wrote:
> Hello devs
> 
> in order to use DOH/DOT, a proxy upstream is configured, when dnsmasq 
> enables use-stale-cache, some upstream may return error when dnsmasq 
> tries to refresh the record from upstream after stale cache is sent to 
> client.
> 
> i reported the issue here in dnsproxy project, as this is the DOH proxy 
> i am currently using. however i've tried many other Go/Rust DOH proxy ( 
> namely doh-client, dns-over-https, dnss, cloudflared) , they all return 
> error when dnsmasq tries to refresh the record.
> 
> https://github.com/AdguardTeam/dnsproxy/issues/328 
> <https://github.com/AdguardTeam/dnsproxy/issues/328>
> 
> only reproducible :  if the requesting client is macOS and the upstream 
> is a DOH proxy, Linux does not have this issue. using a udp upstream 
> like 1.1.1.1 does not have this issue either.
> 
> hope you could take a look at the issue posted.


I think I've found and fixed the problem, but I don't have a macOS 
machine to test with, nor have a I configured a DOH proxy, so I'd 
appreciate it if you could re-run your tests and see if it works with 
the patch in place.


https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=d774add784d01c8346b271e8fb5cbedc44d7ed08

Thanks for the very useful bug report.


Cheers,

Simon.


> 
> -- 
> 
> Regards
> Justin He
> -- 
> 
> Regards
> Justin He
> 
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