Fix null error; Fix promise

index.js

@@ -70,7 +70,7 @@ function initTools(callback) {
  * @param {boolean} useSudo - Use sudo for access?
  */
 function scanNetworks(callback, useSudo) {
-  exec((useSudo && "sudo ") + scanner.cmdLine, function (err, stdout) {
+  exec((useSudo ? "sudo ":"") + scanner.cmdLine, function (err, stdout) {
     if (err) {
       callback(err, null);
       return;
@@ -94,11 +94,20 @@ module.exports = {
           return reject(err);
         }
         scanner = s;
-        scanNetworks(resolve, useSudo);
+	scanNetworks((err, result) => {
+        	if(err)
+                	return reject(err);
+        	resolve(result);
+        }, useSudo);
+
       });
       return;
     }
-    scanNetworks(resolve, useSudo);
-    } )
+    scanNetworks((err, result) => {
+	if(err)
+		return reject(err);
+	resolve(result);
+	}, useSudo);
+    } );
   }
 };

lib/airport.js

@@ -26,7 +26,8 @@ function parseOutput(str, callback) {
         'ssid'   : lines[i].substring(0, 32).trim(),
         'mac'    : '',  // There is no more mac on a mac
         'channel': parseInt(elements[1].trim(), 10),
-        'rssi'   : parseInt(elements[0].trim(), 10)
+        'rssi'   : parseInt(elements[0].trim(), 10),
+      	'encrypted': false,
       });
     }
   }

lib/iwlist.js

@@ -13,6 +13,7 @@ const detector = tool + ' --help';
 
 const macRegex  = /([0-9a-zA-Z]{1}[0-9a-zA-Z]{1}[:]{1}){5}[0-9a-zA-Z]{1}[0-9a-zA-Z]{1}/;
 const cellRegex = /Cell [0-9]{2,} - Address:/;
+const encryptedRegex = /Encryption key:on/g;
 
 /**
  * Parsing the output of iwlist, tool having a lot of different faces :-(
@@ -27,7 +28,8 @@ function parseOutput(str, callback) {
     let blocks = str.split(cellRegex);
 
     blocks.forEach(block => {
-      let network = {};
+      let network = {encrypted: encryptedRegex.test(block)};
+
       let lines   = block.split('\n');
       if (macRegex.exec(lines[0])) {
         // First line is the mac address (always! (?))

lib/netsh.js

@@ -41,7 +41,7 @@ function parseOutput(str, callback) {
     //          Basic rates (MBit/s) : 1 2 5.5 11
     //          Other rates (MBit/s) : 6 9 12 18 24 36 48 54
     for (let i = 1, l = blocks.length; i < l; i++) {
-      let network      = {};
+      let network      = {encrypted: false};
       let lines        = blocks[i].split('\n');
       let regexChannel = /[a-zA-Z0-9()\s]+:[\s]*[0-9]+$/g;
       if (!lines || lines.length < 2) {