Land rapid7#7765, adds the history command to msfconsole

Author: h00die

features/commands/help.feature

@@ -21,6 +21,7 @@ Feature: Help command
           getg          Gets the value of a global variable
           grep          Grep the output of another command
           help          Help menu
+          history       Show commands history
           irb           Drop into irb scripting mode
           load          Load a framework plugin
           quit          Exit the console

lib/msf/ui/console/command_dispatcher/core.rb

@@ -85,7 +85,10 @@ class Core
     "-k" => [ true,  "Keep (include) arg lines at start of output."   ],
     "-c" => [ false, "Only print a count of matching lines."          ])
 
-
+  @@history_opts = Rex::Parser::Arguments.new(
+    "-h" => [ false, "Help banner."                                   ],
+    "-a" => [ false, "Show all commands in history."                  ],
+    "-n" => [ true, "Show the last n commands."                       ])
 
   @@irb_opts = Rex::Parser::Arguments.new(
     "-h" => [ false, "Help banner."                                   ],
@@ -105,6 +108,7 @@ def commands
       "getg"       => "Gets the value of a global variable",
       "grep"       => "Grep the output of another command",
       "help"       => "Help menu",
+      "history"    => "Show commands history",
       "irb"        => "Drop into irb scripting mode",
       "load"       => "Load a framework plugin",
       "quit"       => "Exit the console",
@@ -133,6 +137,7 @@ def initialize(driver)
     @cache_payloads = nil
     @previous_module = nil
     @module_name_stack = []
+    @history_limit = 100
   end
 
   #
@@ -473,6 +478,43 @@ def cmd_exit(*args)
 
   alias cmd_quit cmd_exit
 
+
+  def cmd_history(*args)
+    
+    limit = @history_limit
+    length = Readline::HISTORY.length 
+
+    @@history_opts.parse(args) do |opt, _idx, val|
+      case opt
+      when "-a"
+        limit = length
+      when "-n"
+        return cmd_history_help unless !val.nil? && val.match(/\A[-+]?\d+\z/)
+        limit = val.to_i
+        limit = length if limit >= length
+      when "-h"
+        cmd_history_help
+        return false
+      end
+    end
+
+    start = length - limit 
+    (start..length-1).each do |pos|
+      print "#{pos}  #{Readline::HISTORY[pos]}\n"
+    end
+  end
+
+  def cmd_history_help
+    print_line "Usage: history [options]"
+    print_line
+    print_line "Shows the command history."
+    print_line "If -n is not set, it will only be shown the last #{@history_limit} commands."
+    print_line
+    print @@history_opts.usage
+  end
+
+
+
   def cmd_sleep_help
     print_line "Usage: sleep <seconds>"
     print_line