New ECS modifier option 'add-if-missing'

folbricht / routedns

DNS stub resolver, proxy and router with support for DoT, DoH, DoQ, and DTLS

BSD 3-Clause "New" or "Revised" License

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Closed folbricht closed 5 months ago

folbricht commented 6 months ago

Fixes #383

Adds a new option to the ECS modifier to only add when none was provided by the client already.

 [groups.ecs]
type = "ecs-modifier"
resolvers = ["rrl"]
ecs-op = "add-if-missing"
ecs-prefix4 = 24
ecs-prefix6 = 64