Overhere

This is a very minimal DNS server.
It only supports IPv4 and IPv6 entries.

It uses the default upstream to resolve requests,
if the resolution fails is responds with its own IP.

Help

overhere -h
NAME:
   Overhere - A very minimal DNS server for development purposes.

USAGE:
   main [global options] command [command options] [arguments...]

COMMANDS:
   help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --resolve-to value, --ip value  IP to resolve to. Autodetected by default. [$OVERHERE_RESOLVE_TO]
   --port value, -p value          Port to listen on. (default: 15353) [$OVERHERE_PORT]
   --verbose, -v                   Verbosity of logging. (default: false) [$OVERHERE_VERBOSE]
   --help, -h                      show help (default: false)

Example

Run server:

go run .

Resolve development domain:

dig @127.0.0.1 -p 15353 my-development-server

; <<>> DiG 9.16.1-Ubuntu <<>> @127.0.0.1 -p 15353 my-development-server
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14706
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;my-development-server.         IN      A

;; ANSWER SECTION:
my-development-server.  60      IN      A       192.168.1.2

;; Query time: 11 msec
;; SERVER: 127.0.0.1#15353(127.0.0.1)
;; WHEN: Do Feb 17 09:08:52 CET 2022
;; MSG SIZE  rcvd: 76

Resolve google.com domain:

dig @127.0.0.1 -p 15353 google.com           

; <<>> DiG 9.16.1-Ubuntu <<>> @127.0.0.1 -p 15353 google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47675
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;google.com.                    IN      A

;; ANSWER SECTION:
google.com.             60      IN      A       142.251.36.206
google.com.             60      IN      AAAA    2a00:1450:4016:809::200e

;; Query time: 15 msec
;; SERVER: 127.0.0.1#15353(127.0.0.1)
;; WHEN: Do Feb 17 09:10:01 CET 2022
;; MSG SIZE  rcvd: 92