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https://github.com/wealdtech/coredns-ens


https://github.com/wealdtech/coredns-ens

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README 

        
# coredns-ens



CoreDNS-ENS is a CoreDNS plugin that resolves DNS information over ENS.  It has two primary purposes:



  1. A general-purpose DNS resolver for DNS records stored on the Ethereum blockchain

  2. A specialised resolver for IPFS content hashes and gatways



Details of the first feature can be found at http://www.wealdtech.com/articles/ethdns-an-ethereum-backend-for-the-domain-name-system/



The second feature provides a mechanism to map DNS domains to ENS domains by removing the relevant suffix, for example the DNS domain `wealdtech.eth.link` maps to the ENS domain `wealdtech.eth`, and returning information for IPFS gateways (if an A or AAAA record is requested) as well as IPFS and content hashes (if a TXT record is requested).  The result of this is that IPFS content can be obtained from any web browser by simply 



# Building



The latest build is always available as a docker repository at `wealdtech/coredns-ens`.  If you want to build a standalone copy of CoreDNS with this plugin enabled run the `build-standalone.sh` script, which should work on most unix-like systems.



# Corefile



The plugin has a number of configuration options.  An example annotated Corefile is shown below:



```

# This section enables DNS lookups for all domains on ENS

. {

  rewrite stop {

    # This rewrites any requests for *.eth.link domains to *.eth internally

    # prior to being processed by the main ENS resolver.

    name regex (.*)\.eth\.link {1}.eth

    answer name (.*)\.eth {1}.eth.link

  }

  ens {

    # connection is the connection to an Ethereum node.  It is *highly*

    # recommended that a local node is used, as remote connections can

    # cause DNS requests to time out.

    # This can be either a path to an IPC socket or a URL to a JSON-RPC

    # endpoint.

    connection /home/ethereum/.ethereum/geth.ipc



    # ethlinknameservers are the names of the nameservers that serve

    # EthLink domains.  This will usually be the name of this server,

    # plus potentially one or more others.

    ethlinknameservers ns1.ethdns.xyz ns2.ethdns.xyz



    # ipfsgatewaya is the address of an ENS-enabled IPFS gateway.

    # This value is returned when a request for an A record of an Ethlink

    # domain is received and the domain has a contenthash record in ENS but

    # no A record.  Multiple values can be supplied, separated by a space,

    # in which case all records will be returned.

    ipfsgatewaya 176.9.154.81



    # ipfsgatewayaaaa is the address of an ENS-enabled IPFS gateway.

    # This value is returned when a request for an AAAA record of an Ethlink

    # domain is received and the domain has a contenthash record in ENS but

    # no A record.  Multiple values can be supplied, separated by a space,

    # in which case all records will be returned.

    ipfsgatewayaaaa 2a01:4f8:160:4069::2

  }



  # This enables DNS forwarding.  It should only be enabled if this DNS server

  # is not exposed to the internet, otherwise it becomes an open DNS server and

  # will be flooded with attack packets.

  forward . 8.8.8.8



  errors

}

```



It is also possible to run the DNS server over TLS or over HTTPS; details on how to set up certificates the can be found in the CoreDNS documentation.



# Running standalone



Running CoreDNS standalone is simply a case of starting the binary.  See the CoreDNS documentation for further information.



# Running with Docker



Running CoreDNS with Docker requires running the image created in the `Building` section.  A sample command-line might be:



    docker run -p 53:53/udp --volume=/home/coredns:/etc/coredns wealdtech/coredns-ens:latest



where `/home/coredns` is the directory on the server that contains the Corefile and certificates.