raspberry wifi fix (wip)

lib/wifi.js

@@ -112,6 +112,84 @@ function wifiFrequencyFromChannel(channel) {
   return {}.hasOwnProperty.call(frequencies, channel) ? frequencies[channel] : null;
 }
 
+function getWifiNetworkAlt(iface) {
+  const result = [];
+  try {
+    let iwlistParts = execSync(`export LC_ALL=C; iwlist ${iface} scan; unset LC_ALL`).toString().split('        Cell ');
+    if (iwlistParts[0].indexOf('resource busy')) { return -1; }
+    if (iwlistParts.length > 1) {
+      iwlistParts.shift();
+      for (let i = 0; i < iwlistParts.length; i++) {
+        const lines = iwlistParts[i].split('\n');
+        const channel = util.getValue(lines, 'channel', ':', true);
+        const address = (lines && lines.length && lines[0].indexOf('Address:') >= 0 ? lines[0].split('Address:')[1].trim().toLowerCase() : '');
+        const mode = util.getValue(lines, 'mode', ':', true);
+        const frequency = util.getValue(lines, 'frequency', ':', true);
+        const qualityString = util.getValue(lines, 'Quality', '=', true);
+        const dbParts = qualityString.toLowerCase().split('signal level=');
+        const db = dbParts.length > 1 ? util.toInt(dbParts[1]) : 0;
+        const quality = db ? wifiQualityFromDB(db) : 0;
+        const ssid = util.getValue(lines, 'essid', ':', true);
+
+        // security and wpa-flags
+        const isWpa = iwlistParts[i].indexOf(' WPA ') >= 0;
+        const isWpa2 = iwlistParts[i].indexOf('WPA2 ') >= 0;
+        const security = [];
+        if (isWpa) { security.push('WPA'); }
+        if (isWpa2) { security.push('WPA2'); }
+        const wpaFlags = [];
+        let wpaFlag = '';
+        lines.forEach(function (line) {
+          const l = line.trim().toLowerCase();
+          if (l.indexOf('group cipher') >= 0) {
+            if (wpaFlag) {
+              wpaFlags.push(wpaFlag);
+            }
+            const parts = l.split(':');
+            if (parts.length > 1) {
+              wpaFlag = parts[1].trim();
+            }
+          }
+          if (l.indexOf('pairwise cipher') >= 0) {
+            const parts = l.split(':');
+            if (parts.length > 1) {
+              if (parts[1].indexOf('tkip')) { wpaFlag = (wpaFlag ? 'TKIP/' + wpaFlag : 'TKIP'); }
+              else if (parts[1].indexOf('ccmp')) { wpaFlag = (wpaFlag ? 'CCMP/' + wpaFlag : 'CCMP'); }
+              else if (parts[1].indexOf('proprietary')) { wpaFlag = (wpaFlag ? 'PROP/' + wpaFlag : 'PROP'); }
+            }
+          }
+          if (l.indexOf('authentication suites') >= 0) {
+            const parts = l.split(':');
+            if (parts.length > 1) {
+              if (parts[1].indexOf('802.1x')) { wpaFlag = (wpaFlag ? '802.1x/' + wpaFlag : '802.1x'); }
+              else if (parts[1].indexOf('psk')) { wpaFlag = (wpaFlag ? 'PSK/' + wpaFlag : 'PSK'); }
+            }
+          }
+        });
+        if (wpaFlag) {
+          wpaFlags.push(wpaFlag);
+        }
+
+        result.push({
+          ssid,
+          bssid: address,
+          mode,
+          channel: channel ? util.toInt(channel) : null,
+          frequency: frequency ? util.toInt(frequency.replace('.', '')) : null,
+          signalLevel: db,
+          quality,
+          security,
+          wpaFlags,
+          rsnFlags: []
+        });
+      }
+    }
+    return result;
+  } catch (e) {
+    return -1;
+  }
+}
+
 function wifiNetworks(callback) {
 
   return new Promise((resolve) => {
@@ -155,79 +233,25 @@ function wifiNetworks(callback) {
                 }
               }
               if (iface) {
-                let iwlistParts = execSync(`export LC_ALL=C; iwlist ${iface} scan 2>/dev/null; unset LC_ALL`).toString().split('        Cell ');
+                const res = getWifiNetworkAlt(iface);
-                if (iwlistParts.length > 1) {
+                if (res === -1) {
-                  iwlistParts.shift();
+                  // try again after 4 secs
-                  for (let i = 0; i < iwlistParts.length; i++) {
+                  setTimeout(function (iface) {
-                    const lines = iwlistParts[i].split('\n');
+                    const res = getWifiNetworkAlt(iface);
-                    const channel = util.getValue(lines, 'channel', ':', true);
+                    if (res != -1) { result = res; }
-                    const address = util.getValue(lines, 'address', ':', true);
+                    if (callback) {
-                    const mode = util.getValue(lines, 'mode', ':', true);
+                      callback(result);
-                    const frequency = util.getValue(lines, 'frequency', ':', true);
-                    const qualityString = util.getValue(lines, 'Quality', '=', true);
-                    const dbParts = qualityString.toLowerCase().split('signal level=');
-                    const db = dbParts.length > 1 ? util.toInt(dbParts[1]) : 0;
-                    const quality = db ? wifiQualityFromDB(db) : 0;
-                    const ssid = util.getValue(lines, 'essid', ':', true);
-
-                    // security and wpa-flags
-                    const isWpa = iwlistParts[i].indexOf(' WPA ') >= 0;
-                    const isWpa2 = iwlistParts[i].indexOf('WPA2 ') >= 0;
-                    const security = [];
-                    if (isWpa) { security.push('WPA'); }
-                    if (isWpa2) { security.push('WPA2'); }
-                    const wpaFlags = [];
-                    let wpaFlag = '';
-                    lines.forEach(function (line) {
-                      const l = line.trim().toLowerCase();
-                      if (l.indexOf('group cipher') >= 0) {
-                        if (wpaFlag) {
-                          wpaFlags.push(wpaFlag);
-                        }
-                        const parts = l.split(':');
-                        if (parts.length > 1) {
-                          wpaFlag = parts[1].trim();
-                        }
-                      }
-                      if (l.indexOf('pairwise cipher') >= 0) {
-                        const parts = l.split(':');
-                        if (parts.length > 1) {
-                          if (parts[i].indexOf('tkip')) { wpaFlag = (wpaFlag ? 'TKIP/' + wpaFlag : 'TKIP'); }
-                          else if (parts[i].indexOf('ccmp')) { wpaFlag = (wpaFlag ? 'CCMP/' + wpaFlag : 'CCMP'); }
-                          else if (parts[i].indexOf('proprietary')) { wpaFlag = (wpaFlag ? 'PROP/' + wpaFlag : 'PROP'); }
-                        }
-                      }
-                      if (l.indexOf('authentication suites') >= 0) {
-                        const parts = l.split(':');
-                        if (parts.length > 1) {
-                          if (parts[i].indexOf('802.1x')) { wpaFlag = (wpaFlag ? '802.1x/' + wpaFlag : '802.1x'); }
-                          else if (parts[i].indexOf('psk')) { wpaFlag = (wpaFlag ? 'PSK/' + wpaFlag : 'PSK'); }
-                        }
-                      }
-                    });
-                    if (wpaFlag) {
-                      wpaFlags.push(wpaFlag);
                     }
-
+                    resolve(result);
-                    result.push({
+                  }, 4000);
-                      ssid,
+                } else {
-                      bssid: address,
+                  result = res;
-                      mode,
+                  if (callback) {
-                      channel: channel ? util.toInt(channel) : null,
+                    callback(result);
-                      frequency: frequency ? util.toInt(frequency.replace('.', '')) : null,
-                      signalLevel: db,
-                      quality,
-                      security,
-                      wpaFlags,
-                      rsnFlags: []
-                    });
                   }
+                  resolve(result);
                 }
               }
-              if (callback) {
-                callback(result);
-              }
-              resolve(result);
             } catch (e) {
               if (callback) {
                 callback(result);