Add cl_allow_uploads

With cl_allow_uploads, you can toggle whether the server is allowed to
upload files from your quake directory to the server.

help_variables.json

@@ -1043,6 +1043,21 @@
       "group-id": "9",
       "type": "string"
     },
+    "cl_allow_uploads": {
+      "default": "0",
+      "group-id": "9",
+      "type": "boolean",
+      "values": [
+        {
+          "description": "Don't allow uploads.",
+          "name": "0"
+        },
+        {
+          "description": "Allow uploads.",
+          "name": "1"
+        }
+      ]
+    },
     "cl_anglespeedkey": {
       "default": "1.5",
       "desc": "This variable sets multiplier by which your \"cl_yawspeed\" (how fast you turn) is multiplied when running (+speed).",

src/cl_parse.c

@@ -1287,7 +1287,13 @@ void CL_StartFileUpload (void)
 {
 	char *name;
 	int i;
+	extern cvar_t cl_allow_uploads;
 
+	if (!cl_allow_uploads.integer)
+	{
+		Com_Printf ("This command has been disabled for security reasons. Set cl_allow_uploads to 1 if you want to enable uploads.\n");
+		return;
+	}
 
 	if (cls.state < ca_onserver) 
 	{

src/cmd.c

@@ -69,6 +69,7 @@ cvar_t cl_remote_capabilities = {"cl_remote_capabilities", REMOTE_CAPABILITIES,
 hashtable_t *rc_hash;
 
 cvar_t cl_allow_downloads = {"cl_allow_downloads", "bsp,lmp,loc,mdl,mvd,pcx,spr,wad,wav"};
+cvar_t cl_allow_uploads = {"cl_allow_uploads", "0"};
 
 cbuf_t cbuf_main;
 cbuf_t cbuf_svc;
@@ -2496,6 +2497,7 @@ void Cmd_Init (void)
 	Cvar_Register(&cl_warnexec);
 	Cvar_Register(&cl_remote_capabilities);
 	Cvar_Register(&cl_allow_downloads);
+	Cvar_Register(&cl_allow_uploads);
 
 	Cmd_AddCommand ("macrolist", Cmd_MacroList_f);
 	qsort(msgtrigger_commands,