Fixed the middle mouse exploit

code/_onclick/click.dm

@@ -70,6 +70,10 @@
 	changeNext_click(1)
 
 	var/list/modifiers = params2list(params)
+	var/dragged = modifiers["drag"]
+	if(dragged && !modifiers[dragged])
+		return
+
 	if(modifiers["middle"] && modifiers["shift"] && modifiers["ctrl"])
 		MiddleShiftControlClickOn(A)
 		return

code/controllers/configuration.dm

@@ -2,6 +2,8 @@
 	var/server_name = null				// server name (for world name / status)
 	var/server_suffix = 0				// generate numeric suffix based on server port
 
+	var/minimum_client_build = 1421		// Build 1421 due to the middle mouse button exploit
+
 	var/nudge_script_path = "nudge.py"  // where the nudge.py script is located
 
 	var/log_ooc = 0						// log OOC channel
@@ -382,6 +384,9 @@
 				if("serversuffix")
 					config.server_suffix = 1
 
+				if("minimum_client_build")
+					config.minimum_client_build = text2num(value)
+
 				if("nudge_script_path")
 					config.nudge_script_path = value
 

code/modules/client/client procs.dm

@@ -290,6 +290,10 @@
 		return null
 	if(byond_version < MIN_CLIENT_VERSION) // Too out of date to play at all. Unfortunately, we can't send them a message here.
 		return null
+	if(byond_build < config.minimum_client_build)
+		alert(src, "You are using a byond build which is not supported by this server. Please use a build version of atleast [config.minimum_client_build].", "Incorrect build", "OK")
+		del(src)
+		return
 	if(byond_version < SUGGESTED_CLIENT_VERSION) // Update is suggested, but not required.
 		to_chat(src,"<span class='userdanger'>Your BYOND client (v: [byond_version]) is out of date. This can cause glitches. We highly suggest you download the latest client from http://www.byond.com/ before playing. </span>")
 

config/example/config.txt

@@ -7,6 +7,9 @@ ADMIN_LEGACY_SYSTEM
 ## Add a # infront of this if you want to use the SQL based banning system. The legacy systems use the files in the data folder. You need to set up your database to use the SQL based system.
 BAN_LEGACY_SYSTEM
 
+## Add a # infront of this to unlimit the builds used to play. Advised is to keep it atleast 1421 due to the middle mouse button locking exploit
+MINIMUM_CLIENT_BUILD 1421
+
 ## Add a # here if you wish to use the setup where jobs have more access. This is intended for servers with low populations - where there are not enough players to fill all roles, so players need to do more than just one job. Also for servers where they don't want people to hide in their own departments.
 JOBS_HAVE_MINIMAL_ACCESS