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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server.wifi.util;
import android.net.wifi.ScanResult;
import android.net.wifi.WifiConfiguration;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.util.ArrayUtils;
import com.android.server.wifi.ScanDetail;
import com.android.server.wifi.hotspot2.NetworkDetail;
import java.io.PrintWriter;
import java.util.List;
/**
* Scan result utility for any {@link ScanResult} related operations.
* Currently contains:
* > Helper method for converting a ScanResult to a ScanDetail.
* Only fields that are supported in ScanResult are copied.
* > Helper methods to identify the encryption of a ScanResult.
*/
public class ScanResultUtil {
private ScanResultUtil() { /* not constructable */ }
/**
* This method should only be used when the informationElements field in the provided scan
* result is filled in with the IEs from the beacon.
*/
public static ScanDetail toScanDetail(ScanResult scanResult) {
NetworkDetail networkDetail = new NetworkDetail(scanResult.BSSID,
scanResult.informationElements, scanResult.anqpLines, scanResult.frequency);
return new ScanDetail(scanResult, networkDetail);
}
/**
* Helper method to check if the provided |scanResult| corresponds to a PSK network or not.
* This checks if the provided capabilities string contains PSK encryption type or not.
*/
public static boolean isScanResultForPskNetwork(ScanResult scanResult) {
return scanResult.capabilities.contains("PSK");
}
/**
* Helper method to check if the provided |scanResult| corresponds to a EAP network or not.
* This checks if the provided capabilities string contains EAP encryption type or not.
*/
public static boolean isScanResultForEapNetwork(ScanResult scanResult) {
return scanResult.capabilities.contains("EAP");
}
/**
* Helper method to check if the provided |scanResult| corresponds to a EAP network or not.
* This checks if the provided capabilities string contains EAP encryption type or not.
*/
public static boolean isScanResultForEapSuiteBNetwork(ScanResult scanResult) {
return scanResult.capabilities.contains("SUITE-B-192");
}
/**
* Helper method to check if the provided |scanResult| corresponds to a WEP network or not.
* This checks if the provided capabilities string contains WEP encryption type or not.
*/
public static boolean isScanResultForWepNetwork(ScanResult scanResult) {
return scanResult.capabilities.contains("WEP");
}
/**
* Helper method to check if the provided |scanResult| corresponds to OWE network.
* This checks if the provided capabilities string contains OWE or not.
*/
public static boolean isScanResultForOweNetwork(ScanResult scanResult) {
return scanResult.capabilities.contains("OWE");
}
/**
* Helper method to check if the provided |scanResult| corresponds to SAE network.
* This checks if the provided capabilities string contains SAE or not.
*/
public static boolean isScanResultForSaeNetwork(ScanResult scanResult) {
return scanResult.capabilities.contains("SAE");
}
/**
* Helper method to check if the provided |scanResult| corresponds to an open network or not.
* This checks if the provided capabilities string does not contain either of WEP, PSK, SAE
* or EAP encryption types or not.
*/
public static boolean isScanResultForOpenNetwork(ScanResult scanResult) {
return (!(isScanResultForWepNetwork(scanResult) || isScanResultForPskNetwork(scanResult)
|| isScanResultForEapNetwork(scanResult) || isScanResultForSaeNetwork(scanResult)
|| isScanResultForEapSuiteBNetwork(scanResult)));
}
/**
* Helper method to quote the SSID in Scan result to use for comparing/filling SSID stored in
* WifiConfiguration object.
*/
@VisibleForTesting
public static String createQuotedSSID(String ssid) {
return "\"" + ssid + "\"";
}
/**
* Creates a network configuration object using the provided |scanResult|.
* This is used to create ephemeral network configurations.
*/
public static WifiConfiguration createNetworkFromScanResult(ScanResult scanResult) {
WifiConfiguration config = new WifiConfiguration();
config.SSID = createQuotedSSID(scanResult.SSID);
setAllowedKeyManagementFromScanResult(scanResult, config);
return config;
}
/**
* Sets the {@link WifiConfiguration#allowedKeyManagement} field on the given
* {@link WifiConfiguration} based on its corresponding {@link ScanResult}.
*/
public static void setAllowedKeyManagementFromScanResult(ScanResult scanResult,
WifiConfiguration config) {
if (isScanResultForSaeNetwork(scanResult)) {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.SAE);
} else if (isScanResultForPskNetwork(scanResult)) {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
} else if (isScanResultForEapSuiteBNetwork(scanResult)) {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.SUITE_B_192);
} else if (isScanResultForEapNetwork(scanResult)) {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_EAP);
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.IEEE8021X);
} else if (isScanResultForWepNetwork(scanResult)) {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
} else if (isScanResultForOweNetwork(scanResult)) {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.OWE);
} else {
config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
}
}
/**
* Dump the provided scan results list to |pw|.
*/
public static void dumpScanResults(PrintWriter pw, List<ScanResult> scanResults, long nowMs) {
if (scanResults != null && scanResults.size() != 0) {
pw.println(" BSSID Frequency RSSI Age(sec) SSID "
+ " Flags");
for (ScanResult r : scanResults) {
long timeStampMs = r.timestamp / 1000;
String age;
if (timeStampMs <= 0) {
age = "___?___";
} else if (nowMs < timeStampMs) {
age = " 0.000";
} else if (timeStampMs < nowMs - 1000000) {
age = ">1000.0";
} else {
age = String.format("%3.3f", (nowMs - timeStampMs) / 1000.0);
}
String ssid = r.SSID == null ? "" : r.SSID;
String rssiInfo = "";
if (ArrayUtils.size(r.radioChainInfos) == 1) {
rssiInfo = String.format("%5d(%1d:%3d) ", r.level,
r.radioChainInfos[0].id, r.radioChainInfos[0].level);
} else if (ArrayUtils.size(r.radioChainInfos) == 2) {
rssiInfo = String.format("%5d(%1d:%3d/%1d:%3d)", r.level,
r.radioChainInfos[0].id, r.radioChainInfos[0].level,
r.radioChainInfos[1].id, r.radioChainInfos[1].level);
} else {
rssiInfo = String.format("%9d ", r.level);
}
pw.printf(" %17s %9d %18s %7s %-32s %s\n",
r.BSSID,
r.frequency,
rssiInfo,
age,
String.format("%1.32s", ssid),
r.capabilities);
}
}
}
}
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