dnsdist: Allow adding glue to spoofed responses

[peterthomassen]

• Program: dnsdist
• Issue type: Feature request

Short description

SpoofRawAction can be used to spoof responses to NS queries, but glue cannot be included. It would nice to have a way to add glue (e.g., via a method of the DNSQuestion object that allows putting things into the additional section).

Usecase

This is about a spoofing experiment.

Description

For example:

DNSQuestion:addAnswer(rawRData: string, options: table)
DNSQuestion:addAdditional(rawRData: string, options: table)

... used as follows:

dq.addAnswer("\003aaa\004bbbb", { type=DNSQType.TXT, ttl=3600 })
dq.addAnswer("\003ccc", { type=DNSQType.TXT, ttl=3600 })
dq.addAdditional("\001\002\003\004", { type=DNSQType.A, ttl=3600 })
dq.addAdditional("\001\002\003\004\001\002\003\004\001\002\003\004\001\002\003\004", { type=DNSQType.AAAA, ttl=3600 })

... where the owner would be set to the qname.

[pieterlexis]

counter suggestion:

DNSQuestion:addRecord(place: int, name: DNSName, type: int, rawContent: string, ttl?: int)

used as follows:

function a(dq)
  dq:addRecord(DNSSection.Additional, newDNSName("foobar.example"), DNSQType.A, "\001\002\003\004")
end

[rgacogne]

Related to #11191