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This checks if the next middleware to be called is nil, and if so returns ServerFailure and an error. This makes the next calling more robust and saves some lines of code. Also prefix the error with the name of the middleware to aid in debugging.
whoami
whoami returns your local IP address, port and transport used. Your local IP address is returned in the additional section as either an A or AAAA record.
The port and transport are included in the additional section as a SRV record, transport can be "tcp" or "udp".
._<transport>.qname. 0 IN SRV 0 0 <port> .
The whoami middleware will respond to every A or AAAA query, regardless of the query name.
Syntax
whoami
Examples
.:53 {
whoami
}
When queried for "example.org A", CoreDNS will respond with:
;; QUESTION SECTION:
;example.org. IN A
;; ADDITIONAL SECTION:
example.org. 0 IN A 10.240.0.1
_udp.example.org. 0 IN SRV 0 0 40212