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plugin/rewrite: Add "revert" parameter for EDNS0 options (#6893)

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* plugin/rewrite: Add "revert" parameter for EDNS0 options

Signed-off-by: Nikita Usatov <nikitakosatka@yandex.ru>

* Update README

Signed-off-by: Nikita Usatov <nikitakosatka@yandex.ru>

* plugin/rewrite: Update tests

Signed-off-by: Nikita Usatov <nikitakosatka@yandex.ru>

* plugin/rewrite: Revert change to improve coverage

Signed-off-by: Nikita Usatov <nikitakosatka@yandex.ru>

---------

Signed-off-by: Nikita Usatov <nikitakosatka@yandex.ru>
This commit is contained in:
Nikita Usatov
2024-10-07 20:47:56 +03:00
committed by GitHub
parent 5100feebd3
commit 92724349dc
3 changed files with 436 additions and 37 deletions
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plugin/rewrite/README.md
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@@ -463,8 +463,30 @@ rewrite edns0 subnet set 24 56
* If the query's source IP address is an IPv4 address, the first 24 bits in the IP will be the network subnet.
* If the query's source IP address is an IPv6 address, the first 56 bits in the IP will be the network subnet.
### EDNS0 Revert
### CNAME Field Rewrites
Using the `revert` flag, you can revert the changes made by this rewrite call, so the response will not contain this option.
This example sets option, but response will not contain it
~~~ corefile
. {
rewrite edns0 local set 0xffee abcd revert
}
~~~
If only some calls contain the `revert` flag, then the value in the response will be changed to the previous one. So, in this example, the response will contain `abcd` data at `0xffee`
~~~ corefile
. {
rewrite continue {
edns0 local set 0xffee abcd
}
rewrite edns0 local replace 0xffee bcde revert
}
~~~
## CNAME Field Rewrites
There might be a scenario where you want the `CNAME` target of the response to be rewritten. You can do this by using the `CNAME` field rewrite. This will generate new answer records according to the new `CNAME` target.