SRV Record Support.

[Myvar]

Please add support for SRV Record.

Originally posted by @AlexLaroche in #22 (comment)

I need this support as well, i don't mind implementing it my self, would you mind just giving me a brief description on how to do this, or any docs on dns that i might need, then il fork the project and make pr once i get it working ?

[danieljoos]

The implementation can be done by adding a new SrvResourceRecord (or so) class in the /DNS/Protocol/ResourceRecords folder.
You can have a look at other kinds of records there, e.g. the IP Address RR, here:
https://github.com/kapetan/dns/blob/master/DNS/Protocol/ResourceRecords/IPAddressResourceRecord.cs

Those classes basically have two constructors:

1. One that takes the base ResourceRecord object. This is used when the client parses records.
2. Another one that is used for the DNS server use-case, where you want to construct a RR that is provided via your server.

The wiring of those classes to the actual RR type is done in the ResourceRecordFactory:
https://github.com/kapetan/dns/blob/master/DNS/Protocol/ResourceRecords/ResourceRecordFactory.cs

The SRV Resource Records are described in RFC2782:
https://www.ietf.org/rfc/rfc2782.txt

[Myvar]

Il take a crack at it.

[Myvar]

#54 Done.

In my mind i imagined this taking hours but it was actually not that bad.

[kapetan]

Added SRV record implementation 7673e95