BIND 10 #2523: supported generic form of rdata text for well-known type

[BIND 10 Development]

#2523: supported generic form of rdata text for well-known type
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  UnAssigned
            Priority:  medium        |                       Status:  new
           Component:  libdns++      |                    Milestone:  Next-
            Keywords:                |  Sprint-Proposed
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  loadzone-ng
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Description changed by jinmei:

Old description:

> Depend on #2382.
>
> Due to the expected size of #2382, I plan to exclude one corner case
> for that task to this separate ticket: supporting '\# n xxxx' form
> for well-known (predefined) RR types, so we can parse the following
> form of RR:
> {{{
>       e.example.   IN          A               \# 4 0A000001
> }}}
>
> See BIND 9's lib/dns/rdata.c:unknown_fromtext() and
> rdata_validate().  We should be able to support it in the same way.

New description:

 Depend on #2382 and #2426.

 Due to the expected size of #2382, I plan to exclude one corner case
 for that task to this separate ticket: supporting '\# n xxxx' form
 for well-known (predefined) RR types, so we can parse the following
 form of RR:
 {{{
       e.example.   IN          A               \# 4 0A000001
 }}}

 See BIND 9's lib/dns/rdata.c:unknown_fromtext() and
 rdata_validate().  We should be able to support it in the same way.

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Ticket URL: <https://bind10.isc.org/ticket/2523#comment:1>
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