luci-mod-network: add support for multiple dnsmasq sections

In /etc/config/dhcp you can configure multiple config dnsmasq sections in cases where you need different configurations for dnsmasq on different interfaces/vlans, e.g. config dnsmasq 'dns_vlan1' and config dnsmasq 'dns_vlan2'. Currently, luci-mod-network will only show the first config dnsmasq section. This should probably be implemented as several tabs, one for each section.

[thekad]

The above should be said many times, I was also unaware that you could control many instances of dnsmasq with stock openwrt (although with some effort) thank you so much @treysis for the tip 😃 The current use case is (probably not that uncommon) having 2 networks one unrestricted and one restricted with e.g. opendns. If you set the DNS servers per interface it appears to work however all of the servers end up in the same file /tmp/resolv.conf.auto and used by the single instance of dnsmasq. This means your DNS queries will be randomly answered by restricted/unrestricted DNS Servers. The solution is to spawn multiple dnsmasq and point them to different (static) resolv.conf files, which this little piece of buried info makes possible.

[treysis]

Ok I just noticed this has been there for quite some time in some preliminary form…you just have to scroll down on the configuration page 😅 However, this only works for already created sections. It’s not possible to create multiple instances from LuCi, so this still needs some work.