[Dnsmasq-discuss] Behavior change of upstream servers set via DBus

Matus UHLAR - fantomas uhlar at fantomas.sk
Tue Nov 9 09:33:38 UTC 2021


On 09.11.21 17:02, Jerry Xiao wrote:
>With dnsmasq 2.85 I was able to do the following:
>1. set upstream servers (lets say 192.168.1.1) via dbus from the dhcp
>client, in my case it was networkmanager.
>2. add the following config (dnsmasq 2.85):
>server=/google.com/#
>server=/#/1.1.1.1
>
>So that only google.com and its subdomains are forwarded to the
>upstream server (192.168.1.1) while requests for any other domains went
>ahead to 1.1.1.1.

>However with the recent update of dnsmasq 2.86 I noticed that the same
>config above would not work. It seems that the right syntax for
>"server=/#/1.1.1.1" has become "server=//1.1.1.1". This isn't the
>biggest problem though.
>
>with this new config (dnsmasq 2.86):
>server=/google.com/#
>server=//1.1.1.1
>
>Now every single domain (including google.com) is forwarded to the
>upstream server (192.168.1.1) set via the dbus api instead of 1.1.1.1,

that's because the:

server=/google.com/#

means to send the "google.com" requests to default upstream server:

    The special server address '#' means, "use the standard servers", so
    --server=/google.com/1.2.3.4 --server=/www.google.com/# will send
    queries for *.google.com to 1.2.3.4, except *www.google.com which will
    be forwarded as usual.

while the:

server=//1.1.1.1

means to send UNQUALIFIED hosts to 1.1.1.1


>which is an unexpected behavior change from the previous version.
>Setting the upstream server (192.168.1.1) with this config line
>"server=192.168.1.1" without dbus works, though.
>
>Is there something wrong with the new upstream server selection logic?



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Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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