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middleware/httpproxy: add debug queries (#446)

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* middleware/httproxy: implement debug queries

Not too useful at the moment, but o-o.debug queries are supported
and return the Comment from dns.google.com.

Note that this is not always set.

* improve documentation

* Testing cleanups
This commit is contained in:
Miek Gieben
2016-11-29 09:54:57 +00:00
committed by GitHub
parent a1b9f96d87
commit 4cfd19c7c9
12 changed files with 108 additions and 55 deletions
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21
middleware/httpproxy/README.md
View File

@@ -48,3 +48,24 @@ proxy . dns.google.com {
upstream /etc/resolv.conf
}
~~~
## Debug queries
Debug queries are enabled by default and currently there is no way to turn them off. When CoreDNS
receives a debug queries (i.e. the name is prefixed with `o-o.debug.` a TXT record with Comment from
`dns.google.com` is added. Note this is not always set, but sometimes you'll see:
`dig @localhost -p 1053 mx o-o.debug.example.org`:
~~~ txt
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;o-o.debug.example.org. IN MX
;; AUTHORITY SECTION:
example.org. 1799 IN SOA sns.dns.icann.org. noc.dns.icann.org. 2016110711 7200 3600 1209600 3600
;; ADDITIONAL SECTION:
. 0 CH TXT "Response from 199.43.133.53"
~~~