/*
* Copyright (C) 2008 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 android.os.Parcel;
import android.os.Parcelable;
/**
* Describes information about a detected access point. In addition
* to the attributes described here, the supplicant keeps track of
* {@code quality}, {@code noise}, and {@code maxbitrate} attributes,
* but does not currently report them to external clients.
*/
public class ScanResult implements Parcelable {
/**
* The network name.
*/
public String SSID;
/**
* Ascii encoded SSID. This will replace SSID when we deprecate it. @hide
*/
public WifiSsid wifiSsid;
/**
* The address of the access point.
*/
public String BSSID;
/**
* Describes the authentication, key management, and encryption schemes
* supported by the access point.
*/
public String capabilities;
/**
* The detected signal level in dBm, also known as the RSSI.
*
* <p>Use {@link android.net.wifi.WifiManager#calculateSignalLevel} to convert this number into
* an absolute signal level which can be displayed to a user.
*/
public int level;
/**
* The frequency in MHz of the channel over which the client is communicating
* with the access point.
*/
public int frequency;
/**
* timestamp in microseconds (since boot) when
* this result was last seen.
*/
public long timestamp;
/**
* Timestamp representing date when this result was last seen, in milliseconds from 1970
* {@hide}
*/
public long seen;
/**
* If the scan result is a valid autojoin candidate
* {@hide}
*/
public int isAutoJoinCandidate;
/**
* @hide
* Update RSSI of the scan result
* @param previousRSSI
* @param previousSeen
* @param maxAge
*/
public void averageRssi(int previousRssi, long previousSeen, int maxAge) {
if (seen == 0) {
seen = System.currentTimeMillis();
}
long age = seen - previousSeen;
if (previousSeen > 0 && age > 0 && age < maxAge/2) {
// Average the RSSI with previously seen instances of this scan result
double alpha = 0.5 - (double) age / (double) maxAge;
level = (int) ((double) level * (1 - alpha) + (double) previousRssi * alpha);
}
}
/** @hide */
public static final int ENABLED = 0;
/** @hide */
public static final int AUTO_ROAM_DISABLED = 16;
/** @hide */
public static final int AUTO_JOIN_DISABLED = 32;
/** @hide */
public static final int AUTHENTICATION_ERROR = 128;
/**
* Status: indicating join status
* @hide
*/
public int autoJoinStatus;
/**
* num IP configuration failures
* @hide
*/
public int numIpConfigFailures;
/**
* @hide
* Last time we blacklisted the ScanResult
*/
public long blackListTimestamp;
/** @hide **/
public void setAutoJoinStatus(int status) {
if (status < 0) status = 0;
if (status == 0) {
blackListTimestamp = 0;
} else if (status > autoJoinStatus) {
blackListTimestamp = System.currentTimeMillis();
}
autoJoinStatus = status;
}
/**
* Status: indicating the scan result is not a result
* that is part of user's saved configurations
* @hide
*/
public boolean untrusted;
/**
* Number of time we connected to it
* @hide
*/
public int numConnection;
/**
* Number of time autojoin used it
* @hide
*/
public int numUsage;
/**
* The approximate distance to the AP in centimeter, if available. Else
* {@link UNSPECIFIED}.
* {@hide}
*/
public int distanceCm;
/**
* The standard deviation of the distance to the AP, if available.
* Else {@link UNSPECIFIED}.
* {@hide}
*/
public int distanceSdCm;
/**
* {@hide}
*/
public final static int UNSPECIFIED = -1;
/**
* @hide
*/
public boolean is24GHz() {
return ScanResult.is24GHz(frequency);
}
/**
* @hide
* TODO: makes real freq boundaries
*/
public static boolean is24GHz(int freq) {
return freq > 2400 && freq < 2500;
}
/**
* @hide
*/
public boolean is5GHz() {
return ScanResult.is5GHz(frequency);
}
/**
* @hide
* TODO: makes real freq boundaries
*/
public static boolean is5GHz(int freq) {
return freq > 4900 && freq < 5900;
}
/** information element from beacon
* @hide
*/
public static class InformationElement {
public int id;
public byte[] bytes;
public InformationElement() {
}
public InformationElement(InformationElement rhs) {
this.id = rhs.id;
this.bytes = rhs.bytes.clone();
}
}
/** information elements found in the beacon
* @hide
*/
public InformationElement informationElements[];
/** {@hide} */
public ScanResult(WifiSsid wifiSsid, String BSSID, String caps, int level, int frequency,
long tsf) {
this.wifiSsid = wifiSsid;
this.SSID = (wifiSsid != null) ? wifiSsid.toString() : WifiSsid.NONE;
this.BSSID = BSSID;
this.capabilities = caps;
this.level = level;
this.frequency = frequency;
this.timestamp = tsf;
this.distanceCm = UNSPECIFIED;
this.distanceSdCm = UNSPECIFIED;
}
/** {@hide} */
public ScanResult(WifiSsid wifiSsid, String BSSID, String caps, int level, int frequency,
long tsf, int distCm, int distSdCm) {
this.wifiSsid = wifiSsid;
this.SSID = (wifiSsid != null) ? wifiSsid.toString() : WifiSsid.NONE;
this.BSSID = BSSID;
this.capabilities = caps;
this.level = level;
this.frequency = frequency;
this.timestamp = tsf;
this.distanceCm = distCm;
this.distanceSdCm = distSdCm;
}
/** copy constructor {@hide} */
public ScanResult(ScanResult source) {
if (source != null) {
wifiSsid = source.wifiSsid;
SSID = source.SSID;
BSSID = source.BSSID;
capabilities = source.capabilities;
level = source.level;
frequency = source.frequency;
timestamp = source.timestamp;
distanceCm = source.distanceCm;
distanceSdCm = source.distanceSdCm;
seen = source.seen;
autoJoinStatus = source.autoJoinStatus;
untrusted = source.untrusted;
numConnection = source.numConnection;
numUsage = source.numUsage;
numIpConfigFailures = source.numIpConfigFailures;
isAutoJoinCandidate = source.isAutoJoinCandidate;
}
}
/** empty scan result
*
* {@hide}
* */
public ScanResult() {
}
@Override
public String toString() {
StringBuffer sb = new StringBuffer();
String none = "<none>";
sb.append("SSID: ").
append(wifiSsid == null ? WifiSsid.NONE : wifiSsid).
append(", BSSID: ").
append(BSSID == null ? none : BSSID).
append(", capabilities: ").
append(capabilities == null ? none : capabilities).
append(", level: ").
append(level).
append(", frequency: ").
append(frequency).
append(", timestamp: ").
append(timestamp);
sb.append(", distance: ").append((distanceCm != UNSPECIFIED ? distanceCm : "?")).
append("(cm)");
sb.append(", distanceSd: ").append((distanceSdCm != UNSPECIFIED ? distanceSdCm : "?")).
append("(cm)");
if (autoJoinStatus != 0) {
sb.append(", status: ").append(autoJoinStatus);
}
return sb.toString();
}
/** Implement the Parcelable interface {@hide} */
public int describeContents() {
return 0;
}
/** Implement the Parcelable interface {@hide} */
public void writeToParcel(Parcel dest, int flags) {
if (wifiSsid != null) {
dest.writeInt(1);
wifiSsid.writeToParcel(dest, flags);
} else {
dest.writeInt(0);
}
dest.writeString(BSSID);
dest.writeString(capabilities);
dest.writeInt(level);
dest.writeInt(frequency);
dest.writeLong(timestamp);
dest.writeInt(distanceCm);
dest.writeInt(distanceSdCm);
dest.writeLong(seen);
dest.writeInt(autoJoinStatus);
dest.writeInt(untrusted ? 1 : 0);
dest.writeInt(numConnection);
dest.writeInt(numUsage);
dest.writeInt(numIpConfigFailures);
dest.writeInt(isAutoJoinCandidate);
if (informationElements != null) {
dest.writeInt(informationElements.length);
for (int i = 0; i < informationElements.length; i++) {
dest.writeInt(informationElements[i].id);
dest.writeInt(informationElements[i].bytes.length);
dest.writeByteArray(informationElements[i].bytes);
}
} else {
dest.writeInt(0);
}
}
/** Implement the Parcelable interface {@hide} */
public static final Creator<ScanResult> CREATOR =
new Creator<ScanResult>() {
public ScanResult createFromParcel(Parcel in) {
WifiSsid wifiSsid = null;
if (in.readInt() == 1) {
wifiSsid = WifiSsid.CREATOR.createFromParcel(in);
}
ScanResult sr = new ScanResult(
wifiSsid,
in.readString(),
in.readString(),
in.readInt(),
in.readInt(),
in.readLong(),
in.readInt(),
in.readInt()
);
sr.seen = in.readLong();
sr.autoJoinStatus = in.readInt();
sr.untrusted = in.readInt() != 0;
sr.numConnection = in.readInt();
sr.numUsage = in.readInt();
sr.numIpConfigFailures = in.readInt();
sr.isAutoJoinCandidate = in.readInt();
int n = in.readInt();
if (n != 0) {
sr.informationElements = new InformationElement[n];
for (int i = 0; i < n; i++) {
sr.informationElements[i] = new InformationElement();
sr.informationElements[i].id = in.readInt();
int len = in.readInt();
sr.informationElements[i].bytes = new byte[len];
in.readByteArray(sr.informationElements[i].bytes);
}
}
return sr;
}
public ScanResult[] newArray(int size) {
return new ScanResult[size];
}
};
}
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