Implementation of check function

check function written, not tested.
removed 3 lines from exploit function that did this check.

Author: xychix

modules/exploits/linux/smtp/harakiri.rb

@@ -89,7 +89,16 @@ def on_request_uri(cli, request)
     @elf_sent = true
     send_response(cli, @pl)
   end
-
+  
+  def check
+    if datastore['SkipVersionCheck'] and self.banner.to_s !~ /Haraka /
+      return Exploit::CheckCode::Detected
+    else
+       return Exploit::CheckCode::Unknown
+    end
+    Exploit::CheckCode::Safe
+  end
+  
   def exploit
     @pl = generate_payload_exe
     @elf_sent = false
@@ -137,10 +146,6 @@ def exploit
 
 
     print_status("#{rhost}:#{rport} - Server: #{self.banner.to_s.strip}")
-    if not datastore['SkipVersionCheck'] and self.banner.to_s !~ /Haraka /
-      disconnect
-      fail_with(Failure::NoTarget, "#{rhost}:#{rport} - The target server is not running Haraka!")
-    end
     #
     # Initiate the message
     from = datastore['MAILFROM']