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plugin/metadata: metadata is just label=value (#1914)

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This revert 17d807f0 and re-adds the metadata plugin as a plugin that
just sets a label to a value function.

Add package documentation on how to use the metadata package. Make it
clear that any caching is up to the Func implemented.

There are now - no in tree users. We could add the request metadata by
default under names that copy request.Request, i.e

request/ip - remote IP
request/port - remote port

Variables.go has been deleted.

Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben
2018-07-01 20:01:17 +01:00
committed by GitHub
parent 0b326e2686
commit 99800a687c
16 changed files with 229 additions and 371 deletions
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10
plugin/rewrite/README.md
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@@ -206,17 +206,13 @@ rewrites the first local option with code 0xffee, setting the data to "abcd". Eq
}
~~~
* A variable data is specified with a pair of curly brackets `{}`. Following are the supported variables by default:
* A variable data is specified with a pair of curly brackets `{}`. Following are the supported variables:
{qname}, {qtype}, {client_ip}, {client_port}, {protocol}, {server_ip}, {server_port}.
Any plugin that can provide it's own additional variables by implementing metadata.Provider interface. If you are going to use metadata variables then metadata plugin must be enabled.
Example:
~~~ corefile
. {
metadata
rewrite edns0 local set 0xffee {client_ip}
}
~~~
rewrite edns0 local set 0xffee {client_ip}
~~~
### EDNS0_NSID