Add a check method for tomcat_mgr_deploy

modules/exploits/multi/http/tomcat_mgr_deploy.rb

@@ -116,6 +116,18 @@ class Metasploit3 < Msf::Exploit::Remote
 			], self.class)
 	end
 
+	def check
+		res = query_serverinfo
+		disconnect
+		return CheckCode::Unknown if res.nil?
+		if (res.code.between?(400, 499))
+			print_error("Server rejected the credentials")
+			return CheckCode::Unknown
+		end
+
+		print_status("Target is #{detect_platform(res.body)} #{detect_arch(res.body)}")
+		return CheckCode::Vulnerable
+	end
 
 	def auto_target
 		print_status("Attempting to automatically select a target...")