Land rapid7#17196, Add new get_hostname library support for Windows

lib/msf/core/post/windows/system.rb

@@ -0,0 +1,58 @@
+# -*- coding: binary -*-
+
+module Msf
+  class Post
+    module Windows
+      module System
+        include Msf::Post::Common
+
+        def initialize(info = {})
+          super(
+            update_info(
+              info,
+              'Compat' => {
+                'Meterpreter' => {
+                  'Commands' => %w[
+                    stdapi_sys_config_sysinfo
+                  ]
+                }
+              }
+            )
+          )
+        end
+
+        #
+        # Gets the hostname of the system
+        #
+        # @return [String] hostname
+        #
+        def get_hostname
+          hostname = nil
+
+          if session.type == 'meterpreter'
+            hostname = session.sys.config.sysinfo['Computer'].to_s
+          end
+
+          if hostname.blank? && session.type == 'powershell'
+            hostname = cmd_exec('[System.Net.Dns]::GetHostName()').to_s
+          end
+
+          if hostname.blank? && command_exists?('hostname')
+            hostname = cmd_exec('hostname').to_s
+          end
+
+          if hostname.blank?
+            hostname = get_env('COMPUTERNAME').to_s
+          end
+
+          raise if hostname.blank?
+
+          report_host({ host: rhost, name: hostname.downcase })
+          hostname.downcase
+        rescue StandardError
+          raise 'Unable to retrieve hostname'
+        end
+      end
+    end
+  end
+end