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Description

RRDA is a REST API written in Go allowing to perform DNS queries over HTTP, and to get reverse PTR records for both IPv4 and IPv6 addresses. It outputs JSON-encoded DNS responses.

The API allows to specify which name server to query (either recursive or authoritative), and can be used as a foundation to build DNS looking glasses.

RRDA is a recursive acronym for "RRDA REST DNS API".

Requirements

RRDA requires the following Go libraries:

Installation

Build and install with the go tool, all dependencies will be automatically fetched and compiled:

go build
go install rrda

Usage

By default, RRDA will bind on localhost, port 8080.

USAGE:
  -host string
        Set the server host (default "127.0.0.1")
  -port string
        Set the server port (default "8080")
  -timeout int
        Set the query timeout in ms (default 2000)
  -version
        Display version

Running RRDA at boot time

Systemd unit file

RRDA is bundled with a systemd unit file, see: systemd/rrda.service

Copy the systemd/rrda.service file in /etc/systemd/system and the RRDA binary in /usr/local/sbin.

To launch the daemon at startup, run:

systemctl enable rrda

Making Queries

The following examples assume there is a resolver on localhost listening on port 53.

Getting Resources Records

URL Scheme: http://server:port/resolver:port/domain/querytype

Getting Reverse PTR Records (for both IPv4 and IPv6 addresses)

URL Scheme: http://server:port/resolver:port/x/ip

Identify a Name Server instance

URL Scheme: http://server:port/resolver:port/id

JSONP Support

RRDA supports JSONP callbacks.

JSON Output Schema

The output is a JSON object containing the following arrays, representing the appropriate sections of DNS packets:

  • question
  • answer
  • authority (omitted if empty)
  • additional (omitted if empty)

Question section

  • name
  • type
  • class

Answer, Authority, Additional sections

  • name
  • type
  • class
  • ttl
  • rdlength
  • rdata

Client Errors

When incorrect user input is entered, the server returns an HTTP 400 Error (Bad Request), along with a JSON-encoded error message.

  • Code 401: Input string could not be parsed
  • Code 402: Input string is not a well-formed domain name
  • Code 403: Input string is not a valid IP address
  • Code 404: Invalid DNS query type

Examples

curl http://127.0.0.1:8080/:53/statdns..net/a
{"code":402,"message":"Input string is not a well-formed domain name"}

curl http://127.0.0.1:8080/:53/x/127.0
{"code":403,"message":"Input string is not a valid IP address"}

curl http://127.0.0.1:8080/:53/statdns.net/error
{"code":404,"message":"Invalid DNS query type"}

Server Errors

When the DNS server cannot be reached or returns an error, the server returns an HTTP 500 Error (Internal Server Error), along with a JSON-encoded error message.

  • Code 501: DNS server could not be reached
  • Code 502: The name server encountered an internal failure while processing this request (SERVFAIL)
  • Code 503: Some name that ought to exist, does not exist (NXDOMAIN)
  • Code 505: The name server refuses to perform the specified operation for policy or security reasons (REFUSED)

Examples

curl http://127.0.0.1:8080/127.0.0.2:53/statdns.net/a
{"code":501,"message":"DNS server could not be reached"}

curl http://127.0.0.1:8080/:53/lame2.broken-on-purpose.generic-nic.net/soa
{"code":502,"message":"The name server encountered an internal failure while processing this request (SERVFAIL)"}

curl http://127.0.0.1:8080/:53/statdns.nete/a
{"code":503,"message":"Some name that ought to exist, does not exist (NXDOMAIN)"}

curl http://127.0.0.1:8080/:53/lame.broken-on-purpose.generic-nic.net/soa
{"code":505,"message":"The name server refuses to perform the specified operation for policy or security reasons (REFUSED)"}

Sites using RRDA

License

RRDA is released under the BSD 2-Clause license. See LICENSE file for details.

Author

RRDA is developed by Frederic Cambus

Resources

Project homepage: https://www.statdns.com

Latest tarball release: https://www.statdns.com/rrda/rrda-1.4.1.tar.gz

GitHub: https://github.com/fcambus/rrda