Simple DNS spoof server

Simple DNS spoofing server running on UDP that returns fixed IP4 address for any A record.

Building

$ make
$ make check
$ sudo ./sdns

Example run

$ dig @127.0.0.1  example.com

; <<>> DiG 9.18.28-1~deb12u2-Debian <<>> @127.0.0.1 example.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64654
;; flags: qr rd ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

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

;; ANSWER SECTION:
example.com.            300     IN      A       6.6.6.6

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1) (UDP)
;; WHEN: Tue Oct 29 16:44:17 EDT 2024
;; MSG SIZE  rcvd: 45