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plugin/rewrite - extend edns0 local variable support with metadata (#1928)

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* - add support of metadata values for edns0 local variables

* - comments from review.

* - simplify label check. Add UT

* - enhance check for Labels, add UT
- remove IsMetadataSet

* - edns0 variable - if variable is not found just ignore the rewrite.
This commit is contained in:
Francois Tur
2018-07-08 03:18:01 -04:00
committed by Miek Gieben
parent 6ec1978340
commit 7745462430
9 changed files with 132 additions and 22 deletions
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14
plugin/rewrite/README.md
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@@ -209,12 +209,24 @@ 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:
{qname}, {qtype}, {client_ip}, {client_port}, {protocol}, {server_ip}, {server_port}.
Example:
* If the metadata plugin is enabled, then labels are supported as variables if they are presented within curly brackets.
the variable data will be filled with the value associated with that label. If that label is not provided,
the variable will be silently substitute by an empty string.
Examples:
~~~
rewrite edns0 local set 0xffee {client_ip}
~~~
The following example uses metadata and an imaginary "some-plugin" that would provide "some-label" as metadata information.
~~~
metadata
some-plugin
rewrite edns0 local set 0xffee {some-plugin/some-label}
~~~
### EDNS0_NSID
This has no fields; it will add an NSID option with an empty string for the NSID. If the option already exists