[dnsdist] Feature Request: Allows using SpoofAction in DNSResponse

[KagurazakaNyaa]

• Program: dnsdist
• Issue type: Feature request

Short description

Add an action similar to SpoofAction in the request process to the response process, allowing the actual content returned to the client to be modified based on the DNSResponse answer.

Usecase

Resolve a DNS question and return a modified response based on the content of the upstream response.
ref #14795

Description

• https://dnsdist.org/reference/dq.html#DNSResponse allows the use of :spoof(), similar to DNSQuestion
• https://dnsdist.org/reference/constants.html#dnsresponseaction Need to add DNSResponseAction.Spoof, DNSResponseAction.SpoofPacket and DNSResponseAction.SpoofRaw
• https://dnsdist.org/reference/actions.html Add SpoofResponseAction,SpoofCNAMEResponseAction,SpoofRawResponseAction,SpoofSVCResponseAction,SpoofPacketResponseAction similar to their original versions

[rgacogne]

I'm tentatively putting this in the 2.0 milestone, but no promises. As always a pull request would go a long way towards ensuring this happens sooner rather than later :)