https://github.com/owent/coredns-filter

coredns filter plugin
https://github.com/owent/coredns-filter

Last synced: 3 months ago
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coredns filter plugin

Host: GitHub
URL: https://github.com/owent/coredns-filter
Owner: owent
License: apache-2.0
Created: 2022-09-23T03:10:40.000Z (over 2 years ago)
Default Branch: main
Last Pushed: 2022-10-03T09:48:31.000Z (over 2 years ago)
Last Synced: 2024-10-11T16:11:20.760Z (8 months ago)
Language: Go
Size: 34.2 KB
Stars: 0
Watchers: 2
Forks: 0
Open Issues: 0
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

# coredns-filter

filter plugin of coredns

## Name

*filter* - Filter DNS response message.

## Compilation

```txt
filter:github.com/owent/coredns-filter
```

This plugin should be add right after [cache][1].

```bash
sed -i.bak -r '/filter:.*/d' plugin.cfg
sed -i.bak '/cache:.*/i filter:github.com/owent/coredns-filter' plugin.cfg
go get github.com/owent/coredns-filter

go generate
```

## Syntax

```corefile
filter [command options...] {
[command options...]
}
```

Available options:

+ `prefer ` : Return all/A/AAAA records when get both A and AAAA record in a answer.
+ `bogus-nxdomain [ip address/ip prefix...]` : Remove ip and set response code to NXDOMAIN .

## Examples

Enable filter:

```corefile
example.org {
whoami
forward . 8.8.8.8
filter prefer ipv4 {
bogus-nxdomain 127.0.0.1/30 123.125.81.12
}
}
```

## See Also

## For Developers

### Debug Build

```bash
git clone --depth 1 https://github.com/coredns/coredns.git coredns
cd coredns
git reset --hard
sed -i.bak -r '/filter:.*/d' plugin.cfg
sed -i.bak '/cache:.*/a filter:github.com/owent/coredns-filter' plugin.cfg
go get -u github.com/owent/coredns-filter@main
# go get github.com/owent/coredns-filter@latest
go generate

env CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -gcflags=all="-N -l" -o build/linux/amd64/coredns
```

### Configure File For Debug

```conf
(default_dns_ip) {
debug
# errors
forward . 119.29.29.29 223.5.5.5 1.0.0.1 94.140.14.140 2402:4e00:: 2400:3200::1 2400:3200:baba::1 2606:4700:4700::1001 2a10:50c0::1:ff {
policy sequential
}
loop
log
}

. {
import default_dns_ip

filter prefer ipv4
filter {
bogus-nxdomain 127.0.0.1/30 123.125.81.12
}
}
```

### VSCode lanch example

```json
{
"version": "0.2.0",
"configurations": [
{
"name": "Launch Package",
"type": "go",
"request": "launch",
"mode": "debug",
"program": "${workspaceFolder}",
"args": [
"-dns.port=6813",
"-conf=${workspaceFolder}/.vscode/test-coredns.conf",
"-alsologtostderr"
],
"showLog": true
},
{
"name": "Launch Executable",
"type": "go",
"request": "launch",
"mode": "exec",
"program": "${workspaceFolder}/build/linux/amd64/coredns",
"args": [
"-dns.port=6813",
"-conf=${workspaceFolder}/.vscode/test-coredns.conf",
"-alsologtostderr"
],
"cwd": "${workspaceFolder}/build",
"showLog": true
}
]
}
```

### Run

```bash
go get -v github.com/go-delve/delve/cmd/dlv

sudo build/linux/amd64/coredns -dns.port=6813 -conf test-coredns.conf

dig owent.net @127.0.0.1 -p 6813
```

[1]: https://coredns.io/plugins/cache/

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