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/*
* Copyright (C) 2018 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 android.net.wifi;
import static com.android.internal.util.Preconditions.checkNotNull;
import static com.android.internal.util.Preconditions.checkState;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.net.MacAddress;
import android.net.MatchAllNetworkSpecifier;
import android.net.NetworkAgent;
import android.net.NetworkRequest;
import android.net.NetworkSpecifier;
import android.os.Parcel;
import android.os.Parcelable;
import java.util.Objects;
/**
* Network specifier object used by wifi's {@link android.net.NetworkAgent}.
* @hide
*/
public final class WifiNetworkAgentSpecifier extends NetworkSpecifier implements Parcelable {
/**
* Security credentials for the currently connected network.
*/
private final WifiConfiguration mWifiConfiguration;
/**
* The UID of the app that requested a specific wifi network using {@link WifiNetworkSpecifier}.
*
* Will only be filled when the device connects to a wifi network as a result of a
* {@link NetworkRequest} with {@link WifiNetworkSpecifier}. Will be set to -1 if the device
* auto-connected to a wifi network.
*/
private final int mOriginalRequestorUid;
public WifiNetworkAgentSpecifier(@NonNull WifiConfiguration wifiConfiguration,
int originalRequestorUid) {
checkNotNull(wifiConfiguration);
mWifiConfiguration = wifiConfiguration;
mOriginalRequestorUid = originalRequestorUid;
}
/**
* @hide
*/
public static final Creator<WifiNetworkAgentSpecifier> CREATOR =
new Creator<WifiNetworkAgentSpecifier>() {
@Override
public WifiNetworkAgentSpecifier createFromParcel(@NonNull Parcel in) {
WifiConfiguration wifiConfiguration = in.readParcelable(null);
int originalRequestorUid = in.readInt();
return new WifiNetworkAgentSpecifier(wifiConfiguration, originalRequestorUid);
}
@Override
public WifiNetworkAgentSpecifier[] newArray(int size) {
return new WifiNetworkAgentSpecifier[size];
}
};
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(@NonNull Parcel dest, int flags) {
dest.writeParcelable(mWifiConfiguration, flags);
dest.writeInt(mOriginalRequestorUid);
}
@Override
public boolean satisfiedBy(@Nullable NetworkSpecifier other) {
if (this == other) {
return true;
}
// Any generic requests should be satisifed by a specific wifi network.
if (other == null || other instanceof MatchAllNetworkSpecifier) {
return true;
}
if (other instanceof WifiNetworkSpecifier) {
return satisfiesNetworkSpecifier((WifiNetworkSpecifier) other);
}
if (other instanceof WifiNetworkAgentSpecifier) {
throw new IllegalStateException("WifiNetworkAgentSpecifier instances should never be "
+ "compared");
}
return false;
}
/**
* Match {@link WifiNetworkSpecifier} in app's {@link NetworkRequest} with the
* {@link WifiNetworkAgentSpecifier} in wifi platform's {@link NetworkAgent}.
*/
public boolean satisfiesNetworkSpecifier(@NonNull WifiNetworkSpecifier ns) {
// None of these should be null by construction.
// {@link WifiNetworkConfigBuilder} enforces non-null in {@link WifiNetworkSpecifier}.
// {@link WifiNetworkFactory} ensures non-null in {@link WifiNetworkAgentSpecifier}.
checkNotNull(ns);
checkNotNull(ns.ssidPatternMatcher);
checkNotNull(ns.bssidPatternMatcher);
checkNotNull(ns.wifiConfiguration.allowedKeyManagement);
checkNotNull(this.mWifiConfiguration.SSID);
checkNotNull(this.mWifiConfiguration.BSSID);
checkNotNull(this.mWifiConfiguration.allowedKeyManagement);
final String ssidWithQuotes = this.mWifiConfiguration.SSID;
checkState(ssidWithQuotes.startsWith("\"") && ssidWithQuotes.endsWith("\""));
final String ssidWithoutQuotes = ssidWithQuotes.substring(1, ssidWithQuotes.length() - 1);
if (!ns.ssidPatternMatcher.match(ssidWithoutQuotes)) {
return false;
}
final MacAddress bssid = MacAddress.fromString(this.mWifiConfiguration.BSSID);
final MacAddress matchBaseAddress = ns.bssidPatternMatcher.first;
final MacAddress matchMask = ns.bssidPatternMatcher.second;
if (!bssid.matches(matchBaseAddress, matchMask)) {
return false;
}
if (!ns.wifiConfiguration.allowedKeyManagement.equals(
this.mWifiConfiguration.allowedKeyManagement)) {
return false;
}
if (ns.requestorUid != this.mOriginalRequestorUid) {
return false;
}
return true;
}
@Override
public int hashCode() {
return Objects.hash(
mWifiConfiguration.SSID,
mWifiConfiguration.BSSID,
mWifiConfiguration.allowedKeyManagement,
mOriginalRequestorUid);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof WifiNetworkAgentSpecifier)) {
return false;
}
WifiNetworkAgentSpecifier lhs = (WifiNetworkAgentSpecifier) obj;
return Objects.equals(this.mWifiConfiguration.SSID, lhs.mWifiConfiguration.SSID)
&& Objects.equals(this.mWifiConfiguration.BSSID, lhs.mWifiConfiguration.BSSID)
&& Objects.equals(this.mWifiConfiguration.allowedKeyManagement,
lhs.mWifiConfiguration.allowedKeyManagement)
&& mOriginalRequestorUid == lhs.mOriginalRequestorUid;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder("WifiNetworkAgentSpecifier [");
sb.append(", WifiConfiguration=").append(
mWifiConfiguration == null ? null : mWifiConfiguration.configKey())
.append(", mOriginalRequestorUid=").append(mOriginalRequestorUid)
.append("]");
return sb.toString();
}
@Override
public void assertValidFromUid(int requestorUid) {
throw new IllegalStateException("WifiNetworkAgentSpecifier should never be used "
+ "for requests.");
}
}
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