Merge pull request #2934 from phyzical/bugfix/1955

added check for NS interface with user defined guard

src/NetscriptFunctions.ts

@@ -174,7 +174,7 @@ export function NetscriptFunctions(workerScript: WorkerScript): NS {
       throw makeRuntimeRejectMsg(
         workerScript,
         `Invalid scriptArgs argument passed into getRunningScript() from ${callingFnName}(). ` +
-          `This is probably a bug. Please report to game developer`,
+        `This is probably a bug. Please report to game developer`,
       );
     }
 
@@ -692,8 +692,7 @@ export function NetscriptFunctions(workerScript: WorkerScript): NS {
         workerScript.log(
           "weaken",
           () =>
-            `'${server.hostname}' security level weakened to ${
-              server.hackDifficulty
+            `'${server.hostname}' security level weakened to ${server.hackDifficulty
             }. Gained ${numeralWrapper.formatExp(expGain)} hacking exp (t=${numeralWrapper.formatThreads(threads)})`,
         );
         workerScript.scriptRef.onlineExpGained += expGain;
@@ -1650,12 +1649,12 @@ export function NetscriptFunctions(workerScript: WorkerScript): NS {
 
       const cost = getPurchaseServerCost(ram);
       if (cost === Infinity) {
-        if(ram > getPurchaseServerMaxRam()){
+        if (ram > getPurchaseServerMaxRam()) {
           workerScript.log("purchaseServer", () => `Invalid argument: ram='${ram}' must not be greater than getPurchaseServerMaxRam`);
-        }else{
+        } else {
           workerScript.log("purchaseServer", () => `Invalid argument: ram='${ram}' must be a positive power of 2`);
         }
-        
+
         return "";
       }
 
@@ -1837,6 +1836,12 @@ export function NetscriptFunctions(workerScript: WorkerScript): NS {
     },
     tryWritePort: function (port: any, data: any = ""): any {
       updateDynamicRam("tryWritePort", getRamCost(Player, "tryWritePort"));
+      if (typeof data !== "string" && typeof data !== "number") {
+        throw makeRuntimeErrorMsg(
+          "tryWritePort",
+          `Trying to write invalid data to a port: only strings and numbers are valid.`,
+        );
+      }
       if (!isNaN(port)) {
         port = Math.round(port);
         if (port < 1 || port > CONSTANTS.NumNetscriptPorts) {