Rex::IO::StreamServer provides consistent methods and accessors
for TcpServer type consumers, but includes logic for client actions
which are not relevant in a datagram context - connect and
disconnect actions, as well as any notion of stateful session
persistence (the clients queue) do not apply in this paradigm.
Implement a Rex::IO::GramServer mixin which provides common methods
for dispatching requests and sending responses. Defines the same
callback structure for procs as used in the StreamServer, though
utilizing dispatch_request_proc and send_response_proc with client
and data parameters for efficient interception of execution flow
when dealing with stateless comms.
Rewire Rex::Proto::DNS server to use instance variables along the
same convention as other modules, implement the GramServer mixin,
and minor misc cleanup.
-----
Change calling conventions in Rex::Proto::DNS::Server to match
other components.
Clean up the Msf::Exploit::DNS namespace with generic server
interfaces.
Fix the advanged options naming convention - as hdm pointed out,
evasion options use the '::' separator, advanced options use "_".
-----
Testing:
Basic functional tests in Pry for now.
Exploit::Remote::TcpServer contains functionality required by the
hybrid Udp/Tcp Exploit::Remote::DNS::Server. In order to avoid
having to maintain a set of compatible methods across the transport
implementations, create a new mixin "above" the TcpServer to handle
common socket operations - Exploit::Remote::SocketServer.
Copy Exploit::Remote::TcpServer to Exploit::Remote::SocketServer.
Remove common code from Exploit::Remote::TcpServer, remove TCP/SSL
specific code from Exploit::Remote::SocketServer. Require and
include Exploit::Remote::SocketServer in Exploit::Remote::TcpServer
Testing:
Basic testing using the telnet capture server which utilzies the
modified Exploit::Remote::TcpServer mixin:
```
use auxiliary/server/capture/telnet
(2016-02-28)15:23 (S:0 J:0)msf auxiliary(telnet) > exploit
[*] Auxiliary module execution completed
(2016-02-28)15:23 (S:0 J:1)msf auxiliary(telnet) >
[*] [2016.02.28-15:23:39] Listening on 0.0.0.0:23...
[*] [2016.02.28-15:23:39] Server started.
[*] [2016.02.28-15:23:48] TELNET LOGIN 127.0.0.1:60408 jack / jill
Interrupt: use the 'exit' command to quit
```
Spencer McIntyre