Profiling support for msfconsole boot

Set METASPLOIT_FRAMEWORK_PROFILE=true in the environment.  Run
`./msfconsole -q -x exit`.  A pdf will be saved to
tmp/profiles/msfconsole/YYYYMMDDHHMMSS.pdf with the call graph with
numbers being in 100 samples per second.  The pdf is automatically
opened with `open`.

msfconsole

@@ -11,6 +11,33 @@
 
 require 'pathname'
 
+if ENV['METASPLOIT_FRAMEWORK_PROFILE'] == 'true'
+  gem 'perftools.rb'
+  require 'perftools'
+
+  formatted_time = Time.now.strftime('%Y%m%d%H%M%S')
+  root = Pathname.new(__FILE__).parent
+  profile_pathname = root.join('tmp', 'profiles', 'msfconsole', formatted_time)
+
+  profile_pathname.parent.mkpath
+  PerfTools::CpuProfiler.start(profile_pathname.to_path)
+
+  at_exit {
+    PerfTools::CpuProfiler.stop
+
+    puts "Generating pdf"
+
+    pdf_pathname = "#{profile_pathname}.pdf"
+
+
+    if Bundler.clean_system("pprof.rb --pdf #{profile_pathname} > #{pdf_pathname}")
+      puts "PDF saved to #{pdf_pathname}"
+
+      system("open #{pdf_pathname}")
+    end
+  }
+end
+
 #
 # Project
 #