No RDATA records in text format

[asergeyev]

So.. when you use Dynamic Update queries, you sometimes use no RDATA rrs, like this:

RData length will be 0 and there would be text representation like this:

example.org. 0 ANY A 

This library correctly represents such text representation from something like this:

&dns.A{
    Hdr: dns.RR_Header{
        Name:     "example.org.",
        Rrtype:   dns.TypeA,
        Class:    dns.ClassANY,
        Ttl:      0,
        Rdlength: 0,
    },
    A: nil,
}.String()

but fails to parse it back into RR, this one will panic regardless of whitespace after A:

_, err := dns.NewRR("example.org. ANY A")
if err != nil { panic("got error") }

This would not affect much real world operations! I don't know where the need of parsing such records in text format would arise but IMO it worth discussion if this behavior should be considered a bug.

I did not check much but Net::DNS is installed and seem to read those properly:

$ perl -Mv5.16 -MNet::DNS -e "say  Net::DNS::RR->new('example.org. ANY A')->string();"
example.org.    0   ANY A   ; no data

[miekg]

[ Quoting notifications@github.com in "[dns] No RDATA records in text form..." ]

RData length will be 0 and there would be text representation like this:

example.org. 0 ANY A

This library correctly represents such text representation from something like this:

&dns.A{
Hdr: dns.RR_Header{
Name: "example.org.",
Rrtype: dns.TypeA,
Class: dns.ClassANY,
Ttl: 0,
Rdlength: 0,
},
A: nil,
}.String()

but fails to parse it back into RR, this one will panic regardless of whitespace after A:

_, err := dns.NewRR("example.org. ANY A")
if err != nil { panic("got error") }

This would not affect much real world operations! I don't know where the need of parsing such records in text format would arise but IMO it worth discussion if this behavior should be considered a bug.

I did not check much but Net::DNS is installed and seem to read those properly:

$ perl -Mv5.16 -MNet::DNS -e "say Net::DNS::RR->new('example.org. ANY A')->string();"
example.org. 0 ANY A ; no data

Yes, this is a bug and an annoying one as well, because it effects the parsing
and the packing/unpacking functions -- although packing/unpacking should be
fine-ish.

/Miek

Miek Gieben

[miekg]

[ Quoting notifications@github.com in "[dns] No RDATA records in text form..." ]

_, err := dns.NewRR("example.org. ANY A")
if err != nil { panic("got error") }

This would not affect much real world operations! I don't know where the need of parsing such records in text format would arise but IMO it worth discussion if this behavior should be considered a bug.

I did not check much but Net::DNS is installed and seem to read those properly:

$ perl -Mv5.16 -MNet::DNS -e "say Net::DNS::RR->new('example.org. ANY A')->string();"
example.org. 0 ANY A ; no data

Added TestDynamicUpdateParsing as a test and fixed some records, but more work
is needed.

/Miek

Miek Gieben