______ ____________________.
/ / / |
/ . / | R
________ ____/___ __/_____ _____ |
__ __\__ /__\__ /__\__ /__\\__ \__ | R
/// _/ // _/ // |/ \\ ._ \ |
_/ \ \_ \ \_ ' /_ |/ // | D
\_____/_____/___/_____/__________/____/ /_ |
<---------h7/dS!---- \ . \ -------\\______/ | A
\ \ \ |
\______\ \____________________|
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:
- chi: lightweight, idiomatic and composable router - https://github.com/go-chi/chi
- dns: DNS library in Go - https://github.com/miekg/dns
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
- Example (using an IPv4 resolver): http://127.0.0.1:8080/127.0.0.1:53/example.org/ns
- Example (using an IPv6 resolver): http://127.0.0.1:8080/[::1]:53/example.org/ns
Getting Reverse PTR Records (for both IPv4 and IPv6 addresses)
URL Scheme: http://server:port/resolver:port/x/ip
- Example (IPv4): http://127.0.0.1:8080/127.0.0.1:53/x/193.0.6.139
- Example (IPv6): http://127.0.0.1:8080/127.0.0.1:53/x/2001:67c:2e8:22::c100:68b
Identify a Name Server instance
URL Scheme: http://server:port/resolver:port/id
- Example (using an IPv4 resolver): http://127.0.0.1:8080/127.0.0.1:53/id
- Example (using an IPv6 resolver): http://127.0.0.1:8080/[::1]:53/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
- StatDNS: Rest DNS API - https://www.statdns.com/api/
- DNS-LG: Multilocation DNS Looking Glass - http://www.dns-lg.com
License
RRDA is released under the BSD 2-Clause license. See LICENSE file for details.
Author
RRDA is developed by Frederic Cambus
- Site: https://www.cambus.net
Resources
Project homepage: https://www.statdns.com
Latest tarball release: https://www.statdns.com/rrda/rrda-1.4.0.tar.gz
GitHub: https://github.com/fcambus/rrda