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Signed-off-by: Thomas Dang <14917550+litobro@users.noreply.github.com>
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title = "flatten" | ||
description = "*<plugin name>* provides minimal CNAME flattening mirroring the Cloudflare RFC 1034 compliant implementation." | ||
weight = 10 | ||
tags = [ "plugin" , "<plugin name>" ] | ||
categories = [ "plugin", "external" ] | ||
date = "2017-07-22T12:37:19+01:00" | ||
repo = "https://github.com/litobro/flatten" | ||
home = "https://github.com/litobro/flatten/blob/main/README.md" | ||
+++ | ||
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## Description | ||
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The *<plugin name>* plugin is an attempt to provide a minimal CNAME flattening solution that is RFC compliant in accordance with the Cloudflare implementation. | ||
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## Syntax | ||
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~~~ txt | ||
flatten [FROM] [TO] [DNSIP:PORT] | ||
~~~ | ||
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- `FROM`: Original requested NAME | ||
- `TO`: Name to overwrite the A and AAAA records from | ||
- `DNSIP:PORT`: The DNS server and port to resolve the `TO` records from | ||
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## Example Corefile | ||
``` | ||
example.org:53 { | ||
log | ||
flatten example.org google.ca 1.1.1.1:53 | ||
forward . 1.1.1.1 | ||
} | ||
``` | ||
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### Example output | ||
Run the server | ||
``` | ||
$ ./coredns -conf Corefile | ||
example.org.:53 | ||
CoreDNS-1.11.2 | ||
linux/amd64, go1.21.8, 8de4531d-dirty | ||
[INFO] plugin/flatten: 127.0.0.1:37237 - [example.org.] flattened to [google.ca.] via 1.1.1.1:53 | ||
[INFO] plugin/flatten: 127.0.0.1:36670 - [example.org.] flattened to [google.ca.] via 1.1.1.1:53 | ||
``` | ||
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Make a DNS request to the server | ||
``` | ||
$ nslookup example.org 127.0.0.1 | ||
Server: 127.0.0.1 | ||
Address: 127.0.0.1#53 | ||
Name: example.org | ||
Address: 142.250.217.67 | ||
Name: example.org | ||
Address: 2607:f8b0:400a:80b::2003 | ||
Name: example.org | ||
Address: 142.250.217.67 | ||
Name: example.org | ||
Address: 2607:f8b0:400a:804::2003 | ||
$ dig TXT example.org @127.0.0.1 | ||
; <<>> DiG 9.18.18-0ubuntu0.22.04.1-Ubuntu <<>> TXT example.org @127.00.0.1 | ||
;; global options: +cmd | ||
;; Got answer: | ||
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63388 | ||
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 | ||
;; OPT PSEUDOSECTION: | ||
; EDNS: version: 0, flags:; udp: 1232 | ||
;; QUESTION SECTION: | ||
;example.org. IN TXT | ||
;; ANSWER SECTION: | ||
example.org. 86400 IN TXT "v=spf1 -all" | ||
example.org. 86400 IN TXT "6r4wtj10lt2hw0zhyhk7cgzzffhjp7fl" | ||
;; Query time: 99 msec | ||
;; SERVER: 127.0.0.1#53(127.00.0.1) (UDP) | ||
;; WHEN: Wed Apr 17 09:42:46 MDT 2024 | ||
;; MSG SIZE rcvd: 131 |