Build ScanResult.capabilities from IE and capability mask

This take use of InformationElementUtil.Capabilities.buildCapabilities
to build ScanResult.capabilities instead of asking wpa_supplicant for
a FLAG string.

With this change, getRawScanResults() no longer depends on
wpa_supplicant to parse IE elements and provide FLAG string.

This helps us integrate wificond scanning to java framework because
in this way wificond just needs to provide capability mask and raw
IE array, instead of parsing IE array ahead.

BUG=31157181
TEST=compile and manual test
TEST=
example:
flag string before change:[WPA2-PSK-CCMP][WPS][ESS]
flag string after change:[WPA2-PSK][ESS]
Since we only care PSK, WEP and EAP keywords, these strings can be seen
as identical.

Change-Id: I97fe527416c3678d49b6516f2cac1ddbdf4b29bb

1 files changed, 33 insertions, 16 deletions

diff --git a/service/java/com/android/server/wifi/WifiNative.java b/service/java/com/android/server/wifi/WifiNative.java
index 1a04c91a9..af6fc55a9 100644
--- a/service/java/com/android/server/wifi/WifiNative.java
+++ b/service/java/com/android/server/wifi/WifiNative.java
@@ -554,32 +554,32 @@ public class WifiNative {
      * RANGE=ID- gets results from ID
      * MASK=<N> BSS command information mask.
      *
-     * The mask used in this method, 0x29d87, gets the following fields:
+     * The mask used in this method, 0x21d97, gets the following fields:
      *
-     *     WPA_BSS_MASK_ID         (Bit 0)
-     *     WPA_BSS_MASK_BSSID      (Bit 1)
-     *     WPA_BSS_MASK_FREQ       (Bit 2)
-     *     WPA_BSS_MASK_LEVEL      (Bit 7)
-     *     WPA_BSS_MASK_TSF        (Bit 8)
-     *     WPA_BSS_MASK_IE         (Bit 10)
-     *     WPA_BSS_MASK_FLAGS      (Bit 11)
-     *     WPA_BSS_MASK_SSID       (Bit 12)
-     *     WPA_BSS_MASK_INTERNETW  (Bit 15) (adds ANQP info)
-     *     WPA_BSS_MASK_DELIM      (Bit 17)
+     *     WPA_BSS_MASK_ID            (Bit 0)
+     *     WPA_BSS_MASK_BSSID         (Bit 1)
+     *     WPA_BSS_MASK_FREQ          (Bit 2)
+     *     WPA_BSS_MASK_CAPABILITIES  (Bit 4)
+     *     WPA_BSS_MASK_LEVEL         (Bit 7)
+     *     WPA_BSS_MASK_TSF           (Bit 8)
+     *     WPA_BSS_MASK_IE            (Bit 10)
+     *     WPA_BSS_MASK_SSID          (Bit 12)
+     *     WPA_BSS_MASK_INTERNETW     (Bit 15) (adds ANQP info)
+     *     WPA_BSS_MASK_DELIM         (Bit 17)
      *
      * See wpa_supplicant/src/common/wpa_ctrl.h for details.
      */
     private String getRawScanResults(String range) {
-        return doStringCommandWithoutLogging("BSS RANGE=" + range + " MASK=0x29d87");
+        return doStringCommandWithoutLogging("BSS RANGE=" + range + " MASK=0x21d97");
     }
 
     private static final String BSS_IE_STR = "ie=";
     private static final String BSS_ID_STR = "id=";
+    private static final String BSS_CAPABILITIES_STR = "capabilities=";
     private static final String BSS_BSSID_STR = "bssid=";
     private static final String BSS_FREQ_STR = "freq=";
     private static final String BSS_LEVEL_STR = "level=";
     private static final String BSS_TSF_STR = "tsf=";
-    private static final String BSS_FLAGS_STR = "flags=";
     private static final String BSS_SSID_STR = "ssid=";
     private static final String BSS_DELIMITER_STR = "====";
     private static final String BSS_END_STR = "####";
@@ -601,12 +601,12 @@ public class WifiNative {
             // huge string buffer while the amount we really want is generally pretty small
             // so make copies instead (one example b/11087956 wasted 400k of heap here).
             final int bssidStrLen = BSS_BSSID_STR.length();
-            final int flagLen = BSS_FLAGS_STR.length();
 
             String bssid = "";
             int level = 0;
             int freq = 0;
             long tsf = 0;
+            int cap = 0;
             String flags = "";
             WifiSsid wifiSsid = null;
             String infoElementsStr = null;
@@ -643,8 +643,12 @@ public class WifiNative {
                     } catch (NumberFormatException e) {
                         tsf = 0;
                     }
-                } else if (line.startsWith(BSS_FLAGS_STR)) {
-                    flags = new String(line.getBytes(), flagLen, line.length() - flagLen);
+                } else if (line.startsWith(BSS_CAPABILITIES_STR)) {
+                    try {
+                        cap = Integer.decode(line.substring(BSS_CAPABILITIES_STR.length()));
+                    } catch (NumberFormatException e) {
+                        cap = 0;
+                    }
                 } else if (line.startsWith(BSS_SSID_STR)) {
                     wifiSsid = WifiSsid.createFromAsciiEncoded(
                             line.substring(BSS_SSID_STR.length()));
@@ -682,6 +686,14 @@ public class WifiNative {
                             if (networkDetail.hasInterworking()) {
                                 if (DBG) Log.d(TAG, "HSNwk: '" + networkDetail);
                             }
+                            BitSet beaconCapBits = new BitSet(16);
+                            for (int i = 0; i < 16; i++) {
+                                if ((cap & (1 << i)) != 0) {
+                                    beaconCapBits.set(i);
+                                }
+                            }
+                            flags = InformationElementUtil.Capabilities.
+                                buildCapabilities(infoElements, beaconCapBits);
                             ScanDetail scan = new ScanDetail(networkDetail, wifiSsid, bssid, flags,
                                     level, freq, tsf, infoElements, anqpLines);
                             results.add(scan);
@@ -693,6 +705,7 @@ public class WifiNative {
                     level = 0;
                     freq = 0;
                     tsf = 0;
+                    cap = 0;
                     flags = "";
                     wifiSsid = null;
                     infoElementsStr = null;
@@ -1445,6 +1458,10 @@ public class WifiNative {
         doBooleanCommand("DRIVER MIRACAST " + mode);
     }
 
+    public boolean fetchAnqp(String bssid, String subtypes) {
+        return doBooleanCommand("ANQP_GET " + bssid + " " + subtypes);
+    }
+
     /*
      * NFC-related calls
      */