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Add PTR records to supported types (#5565)

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* Add PTR records to supported types

Signed-off-by: Alex Bulatov <xbulat@gmail.com>

* Add extra line

Signed-off-by: Alex Bulatov <xbulat@gmail.com>

* Fix title

Signed-off-by: Alex Bulatov <xbulat@gmail.com>

Signed-off-by: Alex Bulatov <xbulat@gmail.com>
This commit is contained in:
Alex
2022-08-14 17:26:39 +03:00
committed by GitHub
parent 5c1447e0b0
commit c9e9954d33
2 changed files with 43 additions and 1 deletions
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40
plugin/rewrite/README.md
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@@ -205,7 +205,7 @@ regular expression and a rewrite name as parameters and works in the same way as
Note that names in the `AUTHORITY SECTION` and `ADDITIONAL SECTION` will also be
rewritten following the specified rules. The names returned by the following
record types: `CNAME`, `DNAME`, `SOA`, `SRV`, `MX`, `NAPTR`, `NS` will be rewritten
record types: `CNAME`, `DNAME`, `SOA`, `SRV`, `MX`, `NAPTR`, `NS`, `PTR` will be rewritten
if the `answer value` rule is specified.
The syntax for the rewrite of DNS request and response is as follows:
@@ -222,6 +222,44 @@ Note that the above syntax is strict. For response rewrites, only `name`
rules are allowed to match the question section. The answer rewrite must be
after the name, as in the syntax example.
##### Example: PTR Response Value Rewrite
The original response contains the domain `service.consul.` in the `VALUE` part
of the `ANSWER SECTION`
```
$ dig @10.1.1.1 30.30.30.10.in-addr.arpa PTR
;; QUESTION SECTION:
;30.30.30.10.in-addr.arpa. IN PTR
;; ANSWER SECTION:
30.30.30.10.in-addr.arpa. 60 IN PTR ftp-us-west-1.service.consul.
```
The following configuration snippet allows for rewriting of the value
in the `ANSWER SECTION`:
```
rewrite stop {
name suffix .arpa .arpa
answer name auto
answer value (.*)\.service\.consul\. {1}.coredns.rocks.
}
```
Now, the `VALUE` in the `ANSWER SECTION` has been overwritten in the domain part:
```
$ dig @10.1.1.1 30.30.30.10.in-addr.arpa PTR
;; QUESTION SECTION:
;30.30.30.10.in-addr.arpa. IN PTR
;; ANSWER SECTION:
30.30.30.10.in-addr.arpa. 60 IN PTR ftp-us-west-1.coredns.rocks.
```
#### Multiple Response Rewrites
`name` and `value` rewrites can be chained by appending multiple answer rewrite

4
plugin/rewrite/reverter.go
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@@ -117,6 +117,8 @@ func getRecordValueForRewrite(rr dns.RR) (name string) {
return rr.(*dns.NAPTR).Replacement
case dns.TypeSOA:
return rr.(*dns.SOA).Ns
case dns.TypePTR:
return rr.(*dns.PTR).Ptr
default:
return ""
}
@@ -138,5 +140,7 @@ func setRewrittenRecordValue(rr dns.RR, value string) {
rr.(*dns.NAPTR).Replacement = value
case dns.TypeSOA:
rr.(*dns.SOA).Ns = value
case dns.TypePTR:
rr.(*dns.PTR).Ptr = value
}
}