Detect all wifi devices

List connected devices to Android phone working as WiFi Access point

Is there a way in Android API to list connected devices, when Android phone is acting as WiFi router? And also is there a way to interefere with routed request to serve a welcome/login page?

1 Answer 1

This is an answer from another stackoverflow question, I read it before two month and don´t know from which user the answer is from, but this should work. WifiManager gives You what You need:

import java.util.ArrayList; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; import com.whitebyte.hotspotclients.R; import com.whitebyte.wifihotspotutils.ClientScanResult; import com.whitebyte.wifihotspotutils.WifiApManager; public class Main extends Activity < TextView textView1; WifiApManager wifiApManager; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) < super.onCreate(savedInstanceState); setContentView(R.layout.main); textView1 = (TextView) findViewById(R.id.textView1); wifiApManager = new WifiApManager(this); scan(); >private void scan() < ArrayListclients = wifiApManager.getClientList(false); textView1.append("Clients: \n"); for (ClientScanResult clientScanResult : clients) < textView1.append("####################\n"); textView1.append("IpAddr: " + clientScanResult.getIpAddr() + "\n"); textView1.append("Device: " + clientScanResult.getDevice() + "\n"); textView1.append("HWAddr: " + clientScanResult.getHWAddr() + "\n"); textView1.append("isReachable: " + clientScanResult.isReachable() + "\n"); >> 

public class ClientScanResult < private String IpAddr; private String HWAddr; private String Device; private boolean isReachable; public ClientScanResult(String ipAddr, String hWAddr, String device, boolean isReachable) < super(); IpAddr = ipAddr; HWAddr = hWAddr; Device = device; this.setReachable(isReachable); >public String getIpAddr() < return IpAddr; >public void setIpAddr(String ipAddr) < IpAddr = ipAddr; >public String getHWAddr() < return HWAddr; >public void setHWAddr(String hWAddr) < HWAddr = hWAddr; >public String getDevice() < return Device; >public void setDevice(String device) < Device = device; >public void setReachable(boolean isReachable) < this.isReachable = isReachable; >public boolean isReachable()

 public enum WIFI_AP_STATE

import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.lang.reflect.Method; import java.net.InetAddress; import java.util.ArrayList; import android.content.Context; import android.net.wifi.WifiConfiguration; import android.net.wifi.WifiManager; import android.util.Log; public class WifiApManager < private final WifiManager mWifiManager; public WifiApManager(Context context) < mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); >/** * Gets a list of the clients connected to the Hotspot, reachable timeout is 300 * @param onlyReachables if the list should contain unreachable (probably disconnected) clients, otherwise * @return ArrayList of */ public ArrayList getClientList(boolean onlyReachables) < return getClientList(onlyReachables, 300); >/** * Gets a list of the clients connected to the Hotspot * @param onlyReachables if the list should contain unreachable (probably disconnected) clients, otherwise * @param reachableTimeout Reachable Timout in miliseconds * @return ArrayList of */ public ArrayList getClientList(boolean onlyReachables, int reachableTimeout) < BufferedReader br = null; ArrayListresult = null; try < result = new ArrayList(); br = new BufferedReader(new FileReader("/proc/net/arp")); String line; while ((line = br.readLine()) != null) < String[] splitted = line.split(" +"); if ((splitted != null) && (splitted.length >= 4)) < // Basic sanity check String mac = splitted[3]; if (mac.matches(". ")) < boolean isReachable = InetAddress.getByName(splitted[0]).isReachable(reachableTimeout); if (!onlyReachables || isReachable) < result.add(new ClientScanResult(splitted[0], splitted[3], splitted[5], isReachable)); >> > > > catch (Exception e) < Log.e(this.getClass().toString(), e.getMessage()); >finally < try < br.close(); >catch (IOException e) < Log.e(this.getClass().toString(), e.getMessage()); >> return result; > > 

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How to detect all Wi-Fi devices in the area?

Using the airodump-ng tool, you can see information about wireless access points and clients. If there are several access points, then everything is simple and convenient, and what if the total number of APs and stations within the range is measured in hundreds? This amount does not fit into any screen.

With airodump-ng also it is inconvenient to collate connections between stations and APs.

When using the -w option with the awdump-ng option, the captured packets are written to a file, a file with the extension .csv is created, which can be opened by the program for working with tables or a text editor. This file contains information about the devices seen:

The advantage of this file is that, at least you can see all the detected devices. Disadvantage is the inconvenience of data analysis.

As a result, I decided to write a small script for analyzing the .csv file created by the airodump-ng program for my own needs.

The script can do the following:

• shows the total number of seen Access Points, Stations and Stations not connected to any AP;
• for each network determines the manufacturer of the device;
• allocates networks operating at 5 GHz;
• for each network shows the clients connected to it;
• for each client determines the device manufacturer, based on this data, assumes whether the device is a mobile phone, whether it can support the monitor mode;
• shows the networks that each client tried to connect to;
• shows all clients that are not connected to any network, and displays for them the networks they were looking for.

An example of data that displays a script (data received from one location without moving, for 1+ hour):

To analyze the .csv file, it is necessary that airodump-ng create it. To do this, enable monitor mode for wireless interface. I always start with the following two commands, they make me sure that no processes interfere:

sudo systemctl stop NetworkManager sudo airmon-ng check kill

Next enable monitor mode for wireless interface:

sudo ip link set wlan0 down sudo iw wlan0 set monitor control sudo ip link set wlan0 up

Now run airodump-ng with the following command:

sudo airodump-ng --berlin 60000 -w /tmp/test wlan0

If you are also interested in a 5 GHz band and if your wireless adapter supports it, you can add —channel 1-13,36-165:

sudo airodump-ng --channel 1-13,36-165 --berlin 60000 -w /tmp/test wlan0

• —berlin 60000 is used to ensure that APs and Stations that have left the view are not excluded from the list
• -w /tmp/test is used to save files to the /tmp/ directory with the prefix test
• —channel 1-13,36-165 tells wireless to switch over all possible channels, including 5 GHz.

Now create the file wfw.sh:

and copy the following to it

#!/bin/bash if [[ "$1" && -f "$1" ]]; then FILE="$1" else echo 'Specify the .csv file to analyze.'; echo 'Usage:'; echo -e "\tbash wfw.sh /tmp/test-01.csv"; exit fi echo -e "\033[1mTotal Access Points: \033[0;31m`grep -E '([A-Za-z0-9._: @\(\)\\=\[\\"%;-]+,)' $FILE | wc -l`\e[0m" echo -e "\033[1mTotal Stations: \033[0;31m`grep -E '([A-Za-z0-9._: @\(\)\\=\[\\"%;-]+,) ([A-Z0-9:])|(not associated)' $FILE | wc -l`\e[0m" echo -e "\033[1mTotal Stations without association: \033[0;31m`grep -E '(not associated)' $FILE | wc -l`\e[0m" echo -e "\033[0;36m\033[1mAvailable Access Points:\e[0m" while read -r line ; do if [ "`echo "$line" | cut -d ',' -f 14`" != " " ]; then echo -e "\033[1m" `echo -e "$line" | cut -d ',' -f 14` "\e[0m" else echo -e " \e[3mcould not get network name (ESSID)\e[0m" fi fullMAC=`echo "$line" | cut -d ',' -f 1` echo -e "\tMAC-address: $fullMAC" MAC=`echo "$fullMAC" | sed 's/ //g' | sed 's/-//g' | sed 's/://g' | cut -c1-6` result="$(grep -i -A 1 ^$MAC ./oui.txt)"; if [ "$result" ]; then echo -e "\tVendor: `echo "$result" | cut -f 3`" else echo -e "\tVendor: \e[3mInformation not found in the database.\e[0m" fi is5ghz=`echo "$line" | cut -d ',' -f 4 | grep -i -E '36|40|44|48|52|56|60|64|100|104|108|112|116|120|124|128|132|136|140'` if [ "$is5ghz" ]; then echo -e "\t\033[0;31mIt operates at 5 GHz!\e[0m" fi printonce="\tStations:" while read -r line2 ; do clientsMAC=`echo $line2 | grep -E "$fullMAC"` if [ "$clientsMAC" ]; then if [ "$printonce" ]; then echo -e $printonce printonce='' fi echo -e "\t\t\033[0;32m" `echo $clientsMAC | cut -d ',' -f 1` "\e[0m" MAC2=`echo "$clientsMAC" | sed 's/ //g' | sed 's/-//g' | sed 's/://g' | cut -c1-6` result2="$(grep -i -A 1 ^$MAC2 ./oui.txt)"; if [ "$result2" ]; then echo -e "\t\t\tVendor: `echo "$result2" | cut -f 3`" ismobile=`echo $result2 | grep -i -E 'Olivetti|Sony|Mobile|Apple|Samsung|HUAWEI|Motorola|TCT|LG|Ragentek|Lenovo|Shenzhen|Intel|Xiaomi|zte'` warning=`echo $result2 | grep -i -E 'ALFA|Intel'` if [ "$ismobile" ]; then echo -e "\t\t\t\033[0;33mThis is probably a mobile device\e[0m" fi if [ "$warning" ]; then echo -e "\t\t\t\033[0;31;5;7mThe device can support the monitor mode\e[0m" fi else echo -e "\t\t\tVendor: \e[3mInformation not found in the database.\e[0m" fi probed=`echo $line2 | cut -d ',' -f 7` if [ "`echo $probed | grep -E [A-Za-z0-9_\\-]+`" ]; then echo -e "\t\t\tIt probed networks: $probed" fi fi done < <(grep -E '([A-Za-z0-9._: @\(\)\\=\[\\"%;-]+,) ([A-Z0-9:])|(not associated)' $FILE) done < <(grep -E '([A-Za-z0-9._: @\(\)\\=\[\\"%;-]+,)' $FILE) echo -e "\033[0;36m\033[1mNot associated Stations:\e[0m" while read -r line2 ; do clientsMAC=`echo $line2 | cut -d ',' -f 1` echo -e "\033[0;31m" `echo $clientsMAC | cut -d ',' -f 1` "\e[0m" MAC2=`echo "$clientsMAC" | sed 's/ //g' | sed 's/-//g' | sed 's/://g' | cut -c1-6` result2="$(grep -i -A 1 ^$MAC2 ./oui.txt)"; if [ "$result2" ]; then echo -e "\tVendor: `echo "$result2" | cut -f 3`" ismobile=`echo $result2 | grep -i -E 'Olivetti|Sony|Mobile|Apple|Samsung|HUAWEI|Motorola|TCT|LG|Ragentek|Lenovo|Shenzhen|Intel|Xiaomi|zte'` warning=`echo $result2 | grep -i -E 'ALFA|Intel'` if [ "$ismobile" ]; then echo -e "\t\033[0;33mThis is probably a mobile device\e[0m" fi if [ "$warning" ]; then echo -e "\t\033[0;31;5;7mThe device can support the monitor mode\e[0m" fi else echo -e "\tVendor: \e[3mInformation not found in the database.\e[0m" fi probed=`echo $line2 | cut -d ',' -f 7` if [ "`echo $probed | grep -E [A-Za-z0-9_\\-]+`" ]; then echo -e "\tIt probed networks: $probed" fi done < <(grep -E '(not associated)' $FILE)

Also we need a file with a database of MAC-addresses and the corresponding manufacturers, download it to the same directory where the wfw.sh file was placed

wget http://standards-oui.ieee.org/oui/oui.txt

Note that if you run airodump-ng several times, it creates new files each time, without deleting the old ones. I used the prefix test, so when I first started, the file test-01.csv was created in the /tmp/ folder. This is what I will analyze. By the way, the script can be run simultaneously while airodump-ng is running. Example:

Pay attention to the data:

Total Access Points: 135 Total Stations: 519 Total Stations without association: 406

The total number of access points (135) - this is how much my wireless adapter saw Wi-Fi networks in the district (without moving). The total number of Stations (519) is all devices that are connected or not connected to APs. Stations without association (406) are those who are not connected to any of the Wi-Fi networks (for example, they passed by my house with a phone on which Wi-Fi is turned on).

For this AP, the network name was not received, however, one of the clients connected to it searched for a network named RT-727451. It is possible that this is the name of this network:

Similarly for networks on the following screenshots:

Using the script, you can search for different artifacts in the wireless space, for example, not only I have a Wi-Fi adapter with a monitor mode:

A lot of devices where the MAC address starts with DA:A1:19 and is not present in the database:

Although if you google, you can find information that this range belongs to Google itself:

Also, I found mention that a random MAC-address with such a prefix create Android and iOS for privacy.

Conclusion

Let airodump-ng work longer, at least 5-10 minutes, to collect more information.

Depending on the purpose, you can use the data obtained during the movement.

Whether the device is a mobile phone and whether the monitor mode is supported solely on the basis of the manufacturer's name, i.e. the data may be incorrect.

Related articles:

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How to scan IP and Mac address of all Device Connected to wifi in android accurately?

Hi i am trying to find all devices connected to My WIFI Router from android and ,i need to device Mac address and local ip address of each device (Including iOT Devices) , right now , i am trying to find from ARP cache table . but sometime in the scan some devices are missing , it is not so accurate . My Code :

 List devicesInfos = new ArrayList<>(); BufferedReader bufferedReader = null; try < bufferedReader = new BufferedReader(new FileReader("/proc/net/arp")); String line; while ((line = bufferedReader.readLine()) != null) < String[] splitted = line.split(" +"); if (splitted != null && splitted.length >= 4) < String ip = splitted[0]; String mac = splitted[3]; if (mac.matches(". ")) < LocalDeviceInfo thisNode = new LocalDeviceInfo(ip, mac); devicesInfos.add(thisNode); >> > > catch (FileNotFoundException e) < e.printStackTrace(); >catch (IOException e) < e.printStackTrace(); >finally < try < bufferedReader.close(); >catch (IOException e) < e.printStackTrace(); >> // Print Description for (LocalDeviceInfo devicesInfo :devicesInfos)

2 Answers 2

I found the solution of my problem , most of devices was not in the system arp table , so you need to Ping each of device at first time , once you ping that device its will be stored in System ARP Table Which is stored at (/proc/net/arp)

Pinging All devices with ip: ( First you need to find your device's IP Address , than you can determine the subnet mask and you can start pining from (0-255)

public void startPingService(Context context) < ListdeviceInfoList = new ArrayList(); try < WifiManager mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); WifiInfo mWifiInfo = mWifiManager.getConnectionInfo(); String subnet = getSubnetAddress(mWifiManager.getDhcpInfo().gateway); for (int i=1;i<255;i++)< String host = subnet + "." + i; if (InetAddress.getByName(host).isReachable(timeout))< String strMacAddress = getMacAddressFromIP(host); Log.w("DeviceDiscovery", "Reachable Host: " + String.valueOf(host) +" and Mac : "+strMacAddress+" is reachable!"); LocalDeviceInfo localDeviceInfo = new LocalDeviceInfo(host,strMacAddress); deviceInfoList.add(localDeviceInfo); >else < Log.e("DeviceDiscovery", "❌ Not Reachable Host: " + String.valueOf(host)); >> > catch(Exception e) < //System.out.println(e); >> private String getSubnetAddress(int address) < String ipString = String.format( "%d.%d.%d", (address & 0xff), (address >> 8 & 0xff), (address >> 16 & 0xff)); return ipString; > 

Get Mac address from ARP cache Table

public String getMacAddressFromIP(@NonNull String ipFinding) < Log.i("IPScanning","Scan was started!"); ListantarDevicesInfos = new ArrayList<>(); BufferedReader bufferedReader = null; try < bufferedReader = new BufferedReader(new FileReader("/proc/net/arp")); String line; while ((line = bufferedReader.readLine()) != null) < String[] splitted = line.split(" +"); if (splitted != null && splitted.length >= 4) < String ip = splitted[0]; String mac = splitted[3]; if (mac.matches(". ")) < if (ip.equalsIgnoreCase(ipFinding)) < return mac; >> > > > catch (FileNotFoundException e) < e.printStackTrace(); >catch (IOException e) < e.printStackTrace(); >finally < try < bufferedReader.close(); >catch (IOException e) < e.printStackTrace(); >> return "00:00:00:00"; > 

You need these permission too:

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Detecting wifi devices around me with android

Is there a way I can detect all Wifi devices arround me and get signal strength from android device. For experimental use, I would like to run an app on some android device. the app should record signal strength between each phone and the others. I would like the "connection" to be directly between the phone, without using an external router. I believe this is possible as android phone has the ability to function as Wifi router, so it may be detected by other devices. But I have no idea how to programmatically approach this. Can anyone help? Do you think this is possible?

1 Answer 1

If you want to scan all the wifi nearby, try this

Create a wifiManager,BroadcastReceiver, and scan all the wifi using any async task, the result of scanning will get on the broadcast receiver

WifiManager wManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); // wifi Scan new wifiScan().execute(); // call to async task BroadcastReceiver br = new BroadcastReceiver() < @Override public void onReceive(Context c, Intent intent) < wifiList = wManager.getScanResults(); for (int i = 0; i < wifiList.size(); i++) < ScanResult scanresult = wManager.getScanResults().get(i); ssid = scanresult.SSID;//ssid is Name of wifi (String) bid = scanresult.BSSID;// bssid: MAC of wifi (String) level = scanresult.level;//level: strength of wifi(int) >>; // Async task public class wifiScan extends AsyncTask  < int i = 0; protected void onPreExecute() < >protected void onPostExecute(Void results) < if (results != null) < if (i < 6) < new wifiScan().execute(); >> > @Override protected Void doInBackground(Void. params) < registerReceiver(br, new IntentFilter( WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); wManager.startScan(); return null; >> 

You'll be able to communicate between two devices over wifi without a router/access point using Wifi Direct (P2P). I think this features can access from Android 4.0., Otherwise, I am not sure.

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