Don't add noise to the output file

[AlexanderMac]

The tool adds noise in the output file even verbose flag is not set. It's ok to print verbose output to console, but not in file.

I run dnscan with the following args:

dnscan -d example.com -D -o sds.txt

The content of sds.txt:

[*] Processing domain example.com
[*] Using system resolvers ['127.0.0.53']
[+] Getting nameservers
199.43.133.53 - b.iana-servers.net
199.43.135.53 - a.iana-servers.net
[-] Zone transfer failed

[+] IPv6 (AAAA) records found. Try running dnscan with the -6 option.
2606:2800:220:1:248:1893:25c8:1946
[+] TXT records found
"v=spf1 -all"
"8j5nfqld20zpcyr8xjw0ydcfq9rk8hgm"
[-] Invalid DNSKEY record length

[+] MX records found, added to target list
0 .
[*] Scanning example.com for A records
example.com - 93.184.216.34
www.example.com - 93.184.216.34

If you agree with this change, I'll be happy to create a PR.

[rbsec]

Looking at your fork, am I correct in thinking that you essentially want an option that disables all of the checks other than the axfr and subdomain grinding, and that only prints subdomain - ip in the output file?

[AlexanderMac]

Exactly, only subdomain - ip. But I don't suggest adding a new option, I think that it would be ideal to write only subdomain - ip to output file.

[rbsec]

I'm not keen on making that the default mode - even though not everyone is interested in the NS/TXT/MX/DNSSEC/etc scans, they provide a lot of valuable information, and I don't like making major changes to the default behaviour that people's workflows (including my own) rely on.

I've added a -q / --quick mode in 5a48a3e which disables everything other than the zone transfer and subdomain scanning, and reduces the file output (assuming you specify -o) to just subdomain - ip - hopefully this meets your objective.

[AlexanderMac]

Cool, thank you for this change.