Recursive resolution doesn't work if 2+ labels down delegation (example: domain.com delegating subdomain.label2.label1.domain.com directly).

[kakwa]

dnsr seems to have issues resolving records if there is a 2+ labels down delegation in the mix.

As a test example, I've delegated subdeleg.notdel.notdel.notdel.notdel.kakwalab.ovh. (note the notdel intermediary labels) from kakwalab.ovh. and created an A test record record.subdeleg.notdel.notdel.notdel.notdel.kakwalab.ovh. with value 1.1.1.1.

package main

import (
    "fmt"
    "os"
    "github.com/domainr/dnsr"
)

func main() {
    // Create a new DNS resolver
    resolver := dnsr.NewResolver()

    // The IP to reverse lookup (PTR query)
    rec := "record.subdeleg.notdel.notdel.notdel.notdel.kakwalab.ovh."
    dnsr.MaxNameservers = 1
    dnsr.MaxIPs = 1
    dnsr.DebugLogger = os.Stdout

    // Query A record (nil)
    results := resolver.Resolve(rec, "A")
    fmt.Printf("%#v\n", results)

    // Query again (has response (thanks to cache?))
    // results = resolver.Resolve(rec, "A")
    // fmt.Printf("%#v\n", results)
}

Using the above code returns a nil object while dig record.subdeleg.notdel.notdel.notdel.notdel.kakwalab.ovh. A properly returns 1.1.1.1.

This seems to come from the fact dnsr only query for NS one label down.

This issue is common for PTR resolution.

Note:

• with cache, a second resolution is successful
• Draft PR for a fix: Return parent NS if no NS is found and query type is NS #147