Resolve host mixin

[cgranleese-r7]

Note

TODO: Update tests to not resolve against google.com
This PR builds on a previous PR, specifically this comment thread.

This new mixin allows for DNS resolution for modules with multiple session types. E.g. modules/post/windows/gather/enum_computers.rb supports multiple sessions:

'SessionTypes' => %w[meterpreter powershell shell]

However the resolution across these session requires different logic. Meterpreter will now make use of the new Meterpreter API changes that will NEED to be landed before this PR can land.

metasploit-payloads PR - rapid7/metasploit-payloads#681
metasploit-framework PR - #18499

The mixin will check if we have a Meterpreter session with access to the net library and use the new Meterpreter API if so, otherwise fallback to nslookup if not.

Note

A rescue was added to the enum_computers module to allow for instances when the DNS isn't able to be resolved via the meterpreter API. This is due to inconsistent resolving methods in the runtime languages.

With no errors

With every entry returning an error

Mixed results

Verification

List the steps needed to make sure this thing works

• Start msfconsole
• use post/windows/gather/enum_computers.rb
• Target a machine with multiple computers available
• Get a Meterpreter session
• Verify the module now list all expected computers as part of that domain
  Example:

List of identified Hosts.
=========================

 Domain  Hostname  IPs
 ------  --------  ---
 VB      DC1       192.168.175.201, 192.168.175.200, 192.168.175.135

[jvoisin]

nslookup is Windows-specific, yet the resolve_host method doesn't seem to be platform-specific