add rpc call to change meterp transport

this rpc method allows the user to change transport
on an existing meterp session. if it's successful
it will close the old 'session' tied to the rpevious transport

MSP-12722

Author: David Maloney

lib/msf/core/rpc/v10/rpc_session.rb

@@ -395,6 +395,37 @@ def rpc_meterpreter_script( sid, data)
     rpc_meterpreter_run_single( sid, "run #{data}")
   end
 
+  # Changes the Transport of a given Meterpreter Session
+  #
+  # @option opts [String] :transport The transport protocol to use (e.g. reverse_tcp, reverse_http, bind_tcp etc)
+  # @option opts [String] :lhost  The LHOST of the listener to use
+  # @option opts [String] :lport The LPORT of the listener to use
+  # @option opts [String] :ua The User Agent String to use for reverse_http(s)
+  # @option opts [String] :proxy_host The address of the proxy to route transport through
+  # @option opts [String] :proxy_port The port the proxy is listening on
+  # @option opts [String] :proxy_type The type of proxy to use
+  # @option opts [String] :proxy_user The username to authenticate to the proxy with
+  # @option opts [String] :proxy_pass The password to authenticate to the proxy with
+  # @option opts [String] :comm_timeout Connection timeout in seconds
+  # @option opts [String] :session_exp  Session Expiration Timeout
+  # @option opts [String] :retry_total Total number of times to retry etsablishing the transport
+  # @option opts [String] :retry_wait The number of seconds to wait between retries
+  # @option opts [String] :cert  Path to the SSL Cert to use for HTTPS
+  # @return [Boolean] whether the transport was changed successfully
+  def rpc_meterpreter_transport_change(sid,opts={})
+    session = _valid_session(sid,"meterpreter")
+    real_opts = {}
+    opts.each_pair do |key, value|
+      real_opts[key.to_sym] = value
+    end
+    real_opts[:uuid] = session.payload_uuid
+    result = session.core.transport_change(real_opts)
+    if result == true
+      rpc_stop(sid)
+    end
+    result
+  end
+
 
   # Returns the separator used by the meterpreter.
   #