Spring singleton with property

Spring singleton with property - java

I would like to create a singleton that contains the MAC address of the system it is running on, based on a supplied network interface.
I have written the following code:
public class NodeMac {
private static final String INSTANCE = getMacAddress();
private static String networkInterfaceName;
#Value("${machine.network.interface}")
public void setNetworkInterfaceName(String networkInterfaceName) {
NodeMac.networkInterfaceName = networkInterfaceName;
}
private NodeMac() { }
public static String getInstance() {
return INSTANCE;
}
private static String getMacAddress() {
try {
NetworkInterface network = NetworkInterface.getByName(networkInterfaceName);
byte[] mac = network.getHardwareAddress();
System.out.print("Current MAC address : ");
StringBuilder sb = new StringBuilder();
for (int i = 0; i < mac.length; i++) {
sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
}
return sb.toString();
} catch (SocketException | NullPointerException e) {
throw new RuntimeException(
"Failed to extract MAC address for network interface with name " + networkInterfaceName, e);
}
}
}
And in application.properties:
machine.network.interface=eno1
However, I can't find any way to get the property value that contains the name of the network interface. It is always null, no matter how I try to access it.
What is the correct way to do this? Is it an anti-pattern to have a property in a singleton?

Edit
So you're struggling to create single instance pojo class with injected #Value. If you can work with bean then this is the way to go:
#Component // This will default give you a single ton bean
public class NodeMac {
#Value("${machine.network.interface}")
private String networkInterfaceName;
public String getMacAddress() {
try {
NetworkInterface network = NetworkInterface.getByName(networkInterfaceName);
byte[] mac = network.getHardwareAddress();
System.out.print("Current MAC address : ");
StringBuilder sb = new StringBuilder();
for (int i = 0; i < mac.length; i++) {
sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
}
return sb.toString();
} catch (SocketException | NullPointerException e) {
throw new RuntimeException(
"Failed to extract MAC address for network interface with name " + networkInterfaceName, e);
}
}
}
OLD
How do you come up with this expression:
String key = System.getProperty("machine.network.interface");
The machine unlikely have only one network interface so there can't be a single key returned.
Indeed, oracle already writes a tutorial here
public static void main(String args[]) throws SocketException {
Enumeration<NetworkInterface> nets = NetworkInterface.getNetworkInterfaces();
for (NetworkInterface netint : Collections.list(nets))
displayInterfaceInformation(netint);
}
static void displayInterfaceInformation(NetworkInterface netint) throws SocketException {
out.printf("Display name: %s\n", netint.getDisplayName());
out.printf("Name: %s\n", netint.getName());
Enumeration<InetAddress> inetAddresses = netint.getInetAddresses();
for (InetAddress inetAddress : Collections.list(inetAddresses)) {
out.printf("InetAddress: %s\n", inetAddress);
}
out.printf("\n");
}

Related

Hooking into constructor of SecretKey and Mac not works Frida

Recently i tried to get value of secret key used to HMAC but i'm unable to hook into constructor. Here is my frida code:
var secretKey = Java.use("javax.crypto.spec.SecretKeySpec")
var mac = Java.use("javax.crypto.Mac")
mac.init.overload('java.security.Key').implementation = function (bytes) {
console.log("Mac init..")
return this.init(bytes)
}
secretKey.$init.overload('[B', 'java.lang.String').implementation = function (keyBytes, algo) {
console.log("SecretKey (" + algo + ") -> ")
return this.$init(keyBytes, algo)
}
secretKey.$init.overload('[B', 'int', 'int', 'java.lang.String').implementation = function (keyBytes, i, i2, algo) {
console.log("SecretKey (" + algo + ") -> ")
return this.$init(keyBytes, i, i2, algo)
}
But any of those hooks works. I don't know what can be a reason. I checked that this app using Enum to create Mac instance, and it's probably executed during runtime. That's how code looks:
public static void m26694i(Type type, String str) throws Exception {
synchronized (f21525a) {
if (f21526b == null) {
f21526b = type.getMacEnc(str);
}
}
}
#2
public enum Type {
KEY {
#Override
/* renamed from: getMac */
public Mac getMacEnc(String str) throws Exception {
return HmacUtil.m26681a(str);
}
},
FILE {
#Override
/* renamed from: getMac */
public Mac getMacEnc(String str) throws Exception {
Properties properties = new Properties();
InputStream inputStream = null;
try {
inputStream = MACManager.class.getResourceAsStream(str);
if (inputStream != null) {
properties.load(inputStream);
return HmacUtil.m26681a((String) properties.elements().nextElement());
}
throw new FileNotFoundException(str);
} finally {
if (inputStream != null) {
inputStream.close();
}
}
}
};
/* renamed from: getMac */
public abstract Mac getMacEnc(String str) throws Exception;
}
#3
public static Mac m26681a(String str) throws NoSuchAlgorithmException, InvalidKeyException {
SecretKeySpec secretKeySpec = new SecretKeySpec(str.getBytes(), "HmacSHA1");
Mac instance = Mac.getInstance("HmacSHA1");
instance.init(secretKeySpec);
return instance;
}
Any ideas how to hook into SecretKeySpec constructor?

How to get all addresses Ip and mac of connected devices to local network using java

I'm creating a java project that shows hostname , ip and mac address of connected devices using java . I use InetAddress but it only shows me the Ip's and hostname of connected computers without MAC and also can't see connected mobiles like Android devices.
I tried almost every solution on StackOverFlow but none of theme seems to work
public class HostDiscovery
{
private String address;
private int discoveryTimeout;
HostDiscovery( String address, int discoveryTimeout)
{
this.address = address;
this.discoveryTimeout = discoveryTimeout;
}
public Future<HostDiscoveryResult> multithreadedHostDicovery(final ExecutorService exService){
return exService.submit(() -> {
try
{
String HostName = null;
String MacAddress = null;
boolean result = InetAddress.getByName(address).isReachable(discoveryTimeout);
InetAddress ip = InetAddress.getByName(address);
if (result)
{
HostName = InetAddress.getByName(address).getHostName();
if(HostName.endsWith(".mshome.net")){
HostName = HostName.replaceAll(".mshome.net", "");
}
MacAddress = getMacAddress(ip);
}
return new HostDiscoveryResult(address, result, HostName, MacAddress);
} catch (SocketException ex)
{
return new HostDiscoveryResult(address, false, null, null);
}
});
}
private static String getMacAddress(InetAddress ip) throws UnknownHostException {
String address = null;
try {
NetworkInterface network = NetworkInterface.getByInetAddress(ip);
byte[] mac = network.getHardwareAddress();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < mac.length; i++) {
sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
}
address = sb.toString();
} catch (SocketException ex) {
ex.printStackTrace();
}
return address;
}
}

File transfer Client to Client in JAVA

I need to implement a program to transfer files. I decided to make it using a chat template I've made about 1 month ago so I would have a chat with file transfer option.
The transfer should follow the following points:
1- Server only keeps a list of all files provided by connected clients (No file are actually located in the server, only their names)
2- Client "1" requests file "A" then:
if file "A" is located ONLY in client "2", then client "2" should send 100% of the file to client "1"
if file "A" is located in client "2" and client "3" also has file "A", then client "2" should send 50% of the file to client "1" and client "3" should send the other 50%.
(if the file is located in 4 clients it should be 25% each....and so it goes...)
I've already managed to make the server find out which client is requesting the file and which clients have it. But now I'm stuck, I don't know how to make the transfer.
Could someone give me an example of how to do it? or point me through the right direction?
[I'm aware my code has some flaws and I will fix it later, right now I need to make the transfer happen before working on fixes, so please, unless it's related, try to focus on that]
Server:
package tor;
import java.util.*;
import java.io.*;
import java.net.*;
public class Server extends Thread {
private String cname;
private Socket client;
public static Vector<PrintStream> clients;
public static Vector<String> clientnames;
public static Vector<String> archives;
public Server(Socket client) {
this.client = client;
}
public static void main(String[] args) {
clients = new Vector<PrintStream>();
clientnames = new Vector<String>();
archives = new Vector<String>();
try {
ServerSocket server = new ServerSocket(2391);
System.out.println("Server Started!!\n");
while (true) {
Socket client = server.accept();
Server s = new Server(client);
s.start();
}
} catch (IOException e) {
System.out.println("Server could not start ");
}
}
#Override
public void run() {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
PrintStream out = new PrintStream(client.getOutputStream());
cname = in.readLine();
System.out.println(cname + " Connected --- SERVER!");
if (cname == null) {
System.out.println("Unknown Name");
return;
}
clientnames.add(cname);
clients.add(out);
connected(" ********** [", cname, "] Connected! **********");
String arq;
int size = in.read();
System.out.println(size);
for (int i = 0; i < size; i++) {
arq = in.readLine();
archives.add(arq);
}
String msg = in.readLine();
String selected;
while (true) {
while (!(msg).equals("/exit") && !(msg).equals("/Exit") && !(msg).equals("/EXIT")) {
if ((msg).equals("/list") || (msg).equals("/List") || (msg).equals("/list")) {
out.println("-------- Archives List --------");
for (int i = 0; i < archives.size(); i++) {
out.println(i+"- "+archives.get(i));
}
out.println("-------- ******************* --------");
msg = in.readLine();
} else if (msg.equals("/get") || (msg.equals("/GET")) || (msg.equals("/Get"))){
msg = in.readLine();
int gnum = Integer.parseInt(msg);
selected=archives.get(gnum);
returnAll("[", out, "]: ", "idreq");
out.println("1");
reqAll(selected);
// I BELIVE HERE IS THE RIGHT PLACE TO MAKE DE TRANSFER CODE
msg = in.readLine();
} else {
returnAll("[", out, "]: ", msg);
msg = in.readLine();
}
}
msg = in.readLine();
size = Integer.parseInt(msg);
for (int i = 0; i <= size; i++) {
arq = in.readLine();
for(int j=0;j<archives.size();j++) {
if (archives.get(j).equals(arq)) {
archives.remove(j);
}
}
}
returnAll(" ********** [", out, "] disconnected ", " ********** ");
clients.remove(out);
clientnames.remove(cname);
client.close();
break;
}
} catch (IOException e) {
System.out.println("A Client disconnected ");
}
}
// METHOD TO SEND CONNECTION MESSAGE
public void connected(String msg1, String cname, String msg2) throws IOException {
Enumeration<PrintStream> e = clients.elements();
while (e.hasMoreElements()) {
PrintStream message = (PrintStream) e.nextElement();
message.println(msg1 + cname + msg2);
}
}
// METHOD TO RETURN MESSAGE TO ALL CLIENTS
public void returnAll(String msg1, PrintStream saida, String ac, String msg2) throws IOException {
Enumeration<PrintStream> e = clients.elements();
while (e.hasMoreElements()) {
PrintStream message = (PrintStream) e.nextElement();
message.println(msg1 + cname + ac + msg2);
}
}
public void reqAll(String req) throws IOException {
Enumeration<PrintStream> e = clients.elements();
while (e.hasMoreElements()) {
PrintStream message = (PrintStream) e.nextElement();
message.println(req);
}
}
}
Client:
package tor;
import java.io.*;
import java.net.*;
import java.util.ArrayList;
import java.util.Scanner;
public class Client extends Thread {
private Socket con;
private static boolean done = false;
static ArrayList<String> localArq = new ArrayList<String>();
static int c=0;
public Client(Socket s) {
con = s;
}
public static void main(String[] args) {
try {
String ip;
Scanner s = new Scanner(System.in);
System.out.print("Enter Server's IP: ");
ip =s.next();
Socket con = new Socket(ip, 2391);
PrintStream out = new PrintStream(con.getOutputStream());
System.out.println("Connected to Server!");
System.out.print("Enter your Nickname: ");
BufferedReader scan = new BufferedReader(new InputStreamReader(System.in));
String cname = scan.readLine();
out.println(cname);
String dir="C:\\javator\\"+cname;
Thread t = new Client(con);
t.start();
File folder = new File(dir);
folder.mkdir();
File[] listOfFiles = folder.listFiles();
for (int i = 0; i < listOfFiles.length; i++) {
if (listOfFiles[i].isFile()) {
localArq.add(listOfFiles[i].getName());
}
}
int size=localArq.size();
out.write(size);
for(int i=0;i<size;i++) {
out.println(localArq.get(i));
}
String msg;
while (true) {
System.out.print("");
msg = scan.readLine();
if(msg.equals("/ll")) {
System.out.println("-------- LOCAL LIST --------");
for (int i = 0; i < localArq.size(); i++) {
System.out.println(localArq.get(i));
}
System.out.println("-------- ******************* --------");
msg = scan.readLine();
}else if(msg.equals("/exit") || (msg.equals("/Exit")) || (msg.equals("/EXIT"))) {
out.println(msg);
size=localArq.size();
out.println(size);
for(int i=0;i<size;i++) {
out.println(localArq.get(i));
}
}
else if(msg.equals("/get") || (msg.equals("/GET")) || (msg.equals("/Get"))) {
System.out.println("Chose file's number to /get: ");
c++;
}
if (done == true) {
break;
}
out.println(msg);
}
} catch (UnknownHostException e) {
System.out.println(e.getMessage());
} catch (IOException e) {
System.err.println(e.getMessage());
}
}
#Override
public void run() {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String rmsg;
String req;
while (true) {
rmsg = in.readLine();
if (rmsg == null) {
System.out.println("Connection Terminated");
break;
}else if(rmsg.substring(rmsg.length() - 5).equals("idreq")) {
req = in.readLine();
for(int i=0;i<localArq.size();i++) { //IDENTIFIES WHO OWNS THE REQUESTED FILE
if(localArq.get(i).equals(req)) {
System.out.println("Owns requested file");
Socket requester = new Socket("192.168.3.114", 2007);
ObjectOutputStream outputr = new ObjectOutputStream(requester.getOutputStream());
ObjectInputStream inputr = new ObjectInputStream(requester.getInputStream());
Object mens= inputr.readObject();
System.out.println(mens);
outputr.writeObject("OWNER FOUND");
}
}
if(c==1) { //IDENTIFIES WHO WANTS THE FILE
rmsg = in.readLine();
c= Integer.parseInt(rmsg);
System.out.println("file: "+req);
ServerSocket peer = new ServerSocket(2007);
System.out.println("OPEN FOR CONNECTIONS\n");
Socket client = peer.accept();
System.out.println("Client connected: " + client.getInetAddress().getHostAddress());
ObjectOutputStream outputo = new ObjectOutputStream(client.getOutputStream());
ObjectInputStream inputo = new ObjectInputStream(client.getInputStream());
outputo.flush();
outputo.writeObject("Connected to requester");
Object mens= inputo.readObject();
System.out.println(mens);
}
}
else {
System.out.println(rmsg);
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
done = true;
}
}

I was able to make a transfer between two clients easily with the information provided and a little research on stackOverflow to understand more about out/inputStreams!
This post also helped me a lot: Sending a file with Java Sockets, losing data
next step is the shared transfer

C# DNS CLASS equivalent in JAVA - GET IPADDRESS in android [duplicate]

Is it possible to get the IP address of the device using some code?

This is my helper util to read IP and MAC addresses. Implementation is pure-java, but I have a comment block in getMACAddress() which could read the value from the special Linux(Android) file. I've run this code only on few devices and Emulator but let me know here if you find weird results.
// AndroidManifest.xml permissions
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
// test functions
Utils.getMACAddress("wlan0");
Utils.getMACAddress("eth0");
Utils.getIPAddress(true); // IPv4
Utils.getIPAddress(false); // IPv6
Utils.java
import java.io.*;
import java.net.*;
import java.util.*;
//import org.apache.http.conn.util.InetAddressUtils;
public class Utils {
/**
* Convert byte array to hex string
* #param bytes toConvert
* #return hexValue
*/
public static String bytesToHex(byte[] bytes) {
StringBuilder sbuf = new StringBuilder();
for(int idx=0; idx < bytes.length; idx++) {
int intVal = bytes[idx] & 0xff;
if (intVal < 0x10) sbuf.append("0");
sbuf.append(Integer.toHexString(intVal).toUpperCase());
}
return sbuf.toString();
}
/**
* Get utf8 byte array.
* #param str which to be converted
* #return array of NULL if error was found
*/
public static byte[] getUTF8Bytes(String str) {
try { return str.getBytes("UTF-8"); } catch (Exception ex) { return null; }
}
/**
* Load UTF8withBOM or any ansi text file.
* #param filename which to be converted to string
* #return String value of File
* #throws java.io.IOException if error occurs
*/
public static String loadFileAsString(String filename) throws java.io.IOException {
final int BUFLEN=1024;
BufferedInputStream is = new BufferedInputStream(new FileInputStream(filename), BUFLEN);
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream(BUFLEN);
byte[] bytes = new byte[BUFLEN];
boolean isUTF8=false;
int read,count=0;
while((read=is.read(bytes)) != -1) {
if (count==0 && bytes[0]==(byte)0xEF && bytes[1]==(byte)0xBB && bytes[2]==(byte)0xBF ) {
isUTF8=true;
baos.write(bytes, 3, read-3); // drop UTF8 bom marker
} else {
baos.write(bytes, 0, read);
}
count+=read;
}
return isUTF8 ? new String(baos.toByteArray(), "UTF-8") : new String(baos.toByteArray());
} finally {
try{ is.close(); } catch(Exception ignored){}
}
}
/**
* Returns MAC address of the given interface name.
* #param interfaceName eth0, wlan0 or NULL=use first interface
* #return mac address or empty string
*/
public static String getMACAddress(String interfaceName) {
try {
List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface intf : interfaces) {
if (interfaceName != null) {
if (!intf.getName().equalsIgnoreCase(interfaceName)) continue;
}
byte[] mac = intf.getHardwareAddress();
if (mac==null) return "";
StringBuilder buf = new StringBuilder();
for (byte aMac : mac) buf.append(String.format("%02X:",aMac));
if (buf.length()>0) buf.deleteCharAt(buf.length()-1);
return buf.toString();
}
} catch (Exception ignored) { } // for now eat exceptions
return "";
/*try {
// this is so Linux hack
return loadFileAsString("/sys/class/net/" +interfaceName + "/address").toUpperCase().trim();
} catch (IOException ex) {
return null;
}*/
}
/**
* Get IP address from first non-localhost interface
* #param useIPv4 true=return ipv4, false=return ipv6
* #return address or empty string
*/
public static String getIPAddress(boolean useIPv4) {
try {
List<NetworkInterface> interfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface intf : interfaces) {
List<InetAddress> addrs = Collections.list(intf.getInetAddresses());
for (InetAddress addr : addrs) {
if (!addr.isLoopbackAddress()) {
String sAddr = addr.getHostAddress();
//boolean isIPv4 = InetAddressUtils.isIPv4Address(sAddr);
boolean isIPv4 = sAddr.indexOf(':')<0;
if (useIPv4) {
if (isIPv4)
return sAddr;
} else {
if (!isIPv4) {
int delim = sAddr.indexOf('%'); // drop ip6 zone suffix
return delim<0 ? sAddr.toUpperCase() : sAddr.substring(0, delim).toUpperCase();
}
}
}
}
}
} catch (Exception ignored) { } // for now eat exceptions
return "";
}
}
Disclaimer: Ideas and example code to this Utils class came from
several SO posts and Google. I have cleaned and merged all examples.

With permission ACCESS_WIFI_STATE declared in AndroidManifest.xml:
<uses-permission
android:name="android.permission.ACCESS_WIFI_STATE"/>
One can use the WifiManager to obtain the IP address:
Context context = requireContext().getApplicationContext();
WifiManager wm = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
String ip = Formatter.formatIpAddress(wm.getConnectionInfo().getIpAddress());

public static String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
return inetAddress.getHostAddress();
}
}
}
} catch (SocketException ex) {
ex.printStackTrace();
}
return null;
}
I've added inetAddress instanceof Inet4Address to check if it is a ipv4 address.

I used following code:
The reason I used hashCode was because I was getting some garbage values appended to the ip address when I used getHostAddress . But hashCode worked really well for me as then I can use Formatter to get the ip address with correct formatting.
Here is the example output :
1.using getHostAddress : ***** IP=fe80::65ca:a13d:ea5a:233d%rmnet_sdio0
2.using hashCode and Formatter : ***** IP=238.194.77.212
As you can see 2nd methods gives me exactly what I need.
public String getLocalIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
String ip = Formatter.formatIpAddress(inetAddress.hashCode());
Log.i(TAG, "***** IP="+ ip);
return ip;
}
}
}
} catch (SocketException ex) {
Log.e(TAG, ex.toString());
}
return null;
}

Though there's a correct answer, I share my answer here and hope that this way will more convenience.
WifiManager wifiMan = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInf = wifiMan.getConnectionInfo();
int ipAddress = wifiInf.getIpAddress();
String ip = String.format("%d.%d.%d.%d", (ipAddress & 0xff),(ipAddress >> 8 & 0xff),(ipAddress >> 16 & 0xff),(ipAddress >> 24 & 0xff));

Below code might help you.. Don't forget to add permissions..
public String getLocalIpAddress(){
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress();
}
}
}
} catch (Exception ex) {
Log.e("IP Address", ex.toString());
}
return null;
}
Add below permission in the manifest file.
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
happy coding!!

kotlin minimalist version
fun getIpv4HostAddress(): String {
NetworkInterface.getNetworkInterfaces()?.toList()?.map { networkInterface ->
networkInterface.inetAddresses?.toList()?.find {
!it.isLoopbackAddress && it is Inet4Address
}?.let { return it.hostAddress }
}
return ""
}

You do not need to add permissions like what is the case with the solutions provided so far. Download this website as a string:
http://www.ip-api.com/json
or
http://www.telize.com/geoip
Downloading a website as a string can be done with java code:
http://www.itcuties.com/java/read-url-to-string/
Parse the JSON object like this:
https://stackoverflow.com/a/18998203/1987258
The json attribute "query" or "ip" contains the IP address.

private InetAddress getLocalAddress()throws IOException {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
//return inetAddress.getHostAddress().toString();
return inetAddress;
}
}
}
} catch (SocketException ex) {
Log.e("SALMAN", ex.toString());
}
return null;
}

Method getDeviceIpAddress returns device's ip address and prefers wifi interface address if it connected.
#NonNull
private String getDeviceIpAddress() {
String actualConnectedToNetwork = null;
ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
if (connManager != null) {
NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (mWifi.isConnected()) {
actualConnectedToNetwork = getWifiIp();
}
}
if (TextUtils.isEmpty(actualConnectedToNetwork)) {
actualConnectedToNetwork = getNetworkInterfaceIpAddress();
}
if (TextUtils.isEmpty(actualConnectedToNetwork)) {
actualConnectedToNetwork = "127.0.0.1";
}
return actualConnectedToNetwork;
}
#Nullable
private String getWifiIp() {
final WifiManager mWifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (mWifiManager != null && mWifiManager.isWifiEnabled()) {
int ip = mWifiManager.getConnectionInfo().getIpAddress();
return (ip & 0xFF) + "." + ((ip >> 8) & 0xFF) + "." + ((ip >> 16) & 0xFF) + "."
+ ((ip >> 24) & 0xFF);
}
return null;
}
#Nullable
public String getNetworkInterfaceIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
NetworkInterface networkInterface = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = networkInterface.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
String host = inetAddress.getHostAddress();
if (!TextUtils.isEmpty(host)) {
return host;
}
}
}
}
} catch (Exception ex) {
Log.e("IP Address", "getLocalIpAddress", ex);
}
return null;
}

In your activity, the following function getIpAddress(context) returns the phone's IP address:
public static String getIpAddress(Context context) {
WifiManager wifiManager = (WifiManager) context.getApplicationContext()
.getSystemService(WIFI_SERVICE);
String ipAddress = intToInetAddress(wifiManager.getDhcpInfo().ipAddress).toString();
ipAddress = ipAddress.substring(1);
return ipAddress;
}
public static InetAddress intToInetAddress(int hostAddress) {
byte[] addressBytes = { (byte)(0xff & hostAddress),
(byte)(0xff & (hostAddress >> 8)),
(byte)(0xff & (hostAddress >> 16)),
(byte)(0xff & (hostAddress >> 24)) };
try {
return InetAddress.getByAddress(addressBytes);
} catch (UnknownHostException e) {
throw new AssertionError();
}
}

This is a rework of this answer which strips out irrelevant information, adds helpful comments, names variables more clearly, and improves the logic.
Don't forget to include the following permissions:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
InternetHelper.java:
public class InternetHelper {
/**
* Get IP address from first non-localhost interface
*
* #param useIPv4 true=return ipv4, false=return ipv6
* #return address or empty string
*/
public static String getIPAddress(boolean useIPv4) {
try {
List<NetworkInterface> interfaces =
Collections.list(NetworkInterface.getNetworkInterfaces());
for (NetworkInterface interface_ : interfaces) {
for (InetAddress inetAddress :
Collections.list(interface_.getInetAddresses())) {
/* a loopback address would be something like 127.0.0.1 (the device
itself). we want to return the first non-loopback address. */
if (!inetAddress.isLoopbackAddress()) {
String ipAddr = inetAddress.getHostAddress();
boolean isIPv4 = ipAddr.indexOf(':') < 0;
if (isIPv4 && !useIPv4) {
continue;
}
if (useIPv4 && !isIPv4) {
int delim = ipAddr.indexOf('%'); // drop ip6 zone suffix
ipAddr = delim < 0 ? ipAddr.toUpperCase() :
ipAddr.substring(0, delim).toUpperCase();
}
return ipAddr;
}
}
}
} catch (Exception ignored) { } // if we can't connect, just return empty string
return "";
}
/**
* Get IPv4 address from first non-localhost interface
*
* #return address or empty string
*/
public static String getIPAddress() {
return getIPAddress(true);
}
}

WifiManager wm = (WifiManager) getSystemService(WIFI_SERVICE);
String ipAddress = BigInteger.valueOf(wm.getDhcpInfo().netmask).toString();

public static String getdeviceIpAddress() {
try {
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) {
return inetAddress.getHostAddress();
}
}
}
} catch (SocketException ex) {
ex.printStackTrace();
}
return null;
}

You can use LinkProperties. It's recommended for new Android versions.
This function retrieves local IP address for both WiFi and Mobile Data. It requires Manifest.permission.ACCESS_NETWORK_STATE permission.
#Nullable
public static String getDeviceIpAddress(#NonNull ConnectivityManager connectivityManager) {
LinkProperties linkProperties = connectivityManager.getLinkProperties(connectivityManager.getActiveNetwork());
InetAddress inetAddress;
for(LinkAddress linkAddress : linkProperties.getLinkAddresses()) {
inetAddress = linkAddress.getAddress();
if (inetAddress instanceof Inet4Address
&& !inetAddress.isLoopbackAddress()
&& inetAddress.isSiteLocalAddress()) {
return inetAddress.getHostAddress();
}
}
return null;
}

Recently, an IP address is still returned by getLocalIpAddress() despite being disconnected from the network (no service indicator). It means the IP address displayed in the Settings> About phone> Status was different from what the application thought.
I have implemented a workaround by adding this code before:
ConnectivityManager cm = getConnectivityManager();
NetworkInfo net = cm.getActiveNetworkInfo();
if ((null == net) || !net.isConnectedOrConnecting()) {
return null;
}
Does that ring a bell to anyone?

Simply use Volley to get the ip from this site
RequestQueue queue = Volley.newRequestQueue(this);
String urlip = "http://checkip.amazonaws.com/";
StringRequest stringRequest = new StringRequest(Request.Method.GET, urlip, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
txtIP.setText(response);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
txtIP.setText("didnt work");
}
});
queue.add(stringRequest);

in Kotlin, without Formatter
private fun getIPAddress(useIPv4 : Boolean): String {
try {
var interfaces = Collections.list(NetworkInterface.getNetworkInterfaces())
for (intf in interfaces) {
var addrs = Collections.list(intf.getInetAddresses());
for (addr in addrs) {
if (!addr.isLoopbackAddress()) {
var sAddr = addr.getHostAddress();
var isIPv4: Boolean
isIPv4 = sAddr.indexOf(':')<0
if (useIPv4) {
if (isIPv4)
return sAddr;
} else {
if (!isIPv4) {
var delim = sAddr.indexOf('%') // drop ip6 zone suffix
if (delim < 0) {
return sAddr.toUpperCase()
}
else {
return sAddr.substring(0, delim).toUpperCase()
}
}
}
}
}
}
} catch (e: java.lang.Exception) { }
return ""
}

A device might have several IP addresses, and the one in use in a particular app might not be the IP that servers receiving the request will see. Indeed, some users use a VPN or a proxy such as Cloudflare Warp.
If your purpose is to get the IP address as shown by servers that receive requests from your device, then the best is to query an IP geolocation service such as Ipregistry (disclaimer: I work for the company) with its Java client:
https://github.com/ipregistry/ipregistry-java
IpregistryClient client = new IpregistryClient("tryout");
RequesterIpInfo requesterIpInfo = client.lookup();
requesterIpInfo.getIp();
In addition to being really simple to use, you get additional information such as country, language, currency, the time zone for the device IP and you can identify whether the user is using a proxy.

This is the easiest and simple way ever exist on the internet...
First of all, add this permission to your manifest file...
"INTERNET"
"ACCESS_NETWORK_STATE"
add this in onCreate file of Activity..
getPublicIP();
Now Add this function to your MainActivity.class.
private void getPublicIP() {
ArrayList<String> urls=new ArrayList<String>(); //to read each line
new Thread(new Runnable(){
public void run(){
//TextView t; //to show the result, please declare and find it inside onCreate()
try {
// Create a URL for the desired page
URL url = new URL("https://api.ipify.org/"); //My text file location
//First open the connection
HttpURLConnection conn=(HttpURLConnection) url.openConnection();
conn.setConnectTimeout(60000); // timing out in a minute
BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
//t=(TextView)findViewById(R.id.TextView1); // ideally do this in onCreate()
String str;
while ((str = in.readLine()) != null) {
urls.add(str);
}
in.close();
} catch (Exception e) {
Log.d("MyTag",e.toString());
}
//since we are in background thread, to post results we have to go back to ui thread. do the following for that
PermissionsActivity.this.runOnUiThread(new Runnable(){
public void run(){
try {
Toast.makeText(PermissionsActivity.this, "Public IP:"+urls.get(0), Toast.LENGTH_SHORT).show();
}
catch (Exception e){
Toast.makeText(PermissionsActivity.this, "TurnOn wiffi to get public ip", Toast.LENGTH_SHORT).show();
}
}
});
}
}).start();
}

Here is kotlin version of #Nilesh and #anargund
fun getIpAddress(): String {
var ip = ""
try {
val wm = applicationContext.getSystemService(WIFI_SERVICE) as WifiManager
ip = Formatter.formatIpAddress(wm.connectionInfo.ipAddress)
} catch (e: java.lang.Exception) {
}
if (ip.isEmpty()) {
try {
val en = NetworkInterface.getNetworkInterfaces()
while (en.hasMoreElements()) {
val networkInterface = en.nextElement()
val enumIpAddr = networkInterface.inetAddresses
while (enumIpAddr.hasMoreElements()) {
val inetAddress = enumIpAddr.nextElement()
if (!inetAddress.isLoopbackAddress && inetAddress is Inet4Address) {
val host = inetAddress.getHostAddress()
if (host.isNotEmpty()) {
ip = host
break;
}
}
}
}
} catch (e: java.lang.Exception) {
}
}
if (ip.isEmpty())
ip = "127.0.0.1"
return ip
}

Compiling some of the ideas to get the wifi ip from the WifiManager in a nicer kotlin solution:
private fun getWifiIp(context: Context): String? {
return context.getSystemService<WifiManager>().let {
when {
it == null -> "No wifi available"
!it.isWifiEnabled -> "Wifi is disabled"
it.connectionInfo == null -> "Wifi not connected"
else -> {
val ip = it.connectionInfo.ipAddress
((ip and 0xFF).toString() + "." + (ip shr 8 and 0xFF) + "." + (ip shr 16 and 0xFF) + "." + (ip shr 24 and 0xFF))
}
}
}
}
Alternatively you can get the ip adresses of ip4 loopback devices via the NetworkInterface:
fun getNetworkIp4LoopbackIps(): Map<String, String> = try {
NetworkInterface.getNetworkInterfaces()
.asSequence()
.associate { it.displayName to it.ip4LoopbackIps() }
.filterValues { it.isNotEmpty() }
} catch (ex: Exception) {
emptyMap()
}
private fun NetworkInterface.ip4LoopbackIps() =
inetAddresses.asSequence()
.filter { !it.isLoopbackAddress && it is Inet4Address }
.map { it.hostAddress }
.filter { it.isNotEmpty() }
.joinToString()

Blockquote
// get Device Ip Address
open fun getLocalIpAddress(): String? {
try {
val en: Enumeration<NetworkInterface> = NetworkInterface.getNetworkInterfaces()
while (en.hasMoreElements()) {
val networkInterface: NetworkInterface = en.nextElement()
val enumerationIpAddress: Enumeration<InetAddress> = networkInterface.inetAddresses
while (enumerationIpAddress.hasMoreElements()) {
val inetAddress: InetAddress = enumerationIpAddress.nextElement()
if (!inetAddress.isLoopbackAddress && inetAddress is Inet4Address) {
return inetAddress.getHostAddress()
}
}
}
} catch (ex: SocketException) {
ex.printStackTrace()
}
return null
}

If you have a shell ; ifconfig eth0 worked for x86 device too

Please check this code...Using this code. we will get ip from mobile internet...
for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
InetAddress inetAddress = enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress()) {
return inetAddress.getHostAddress().toString();
}
}
}

I don't do Android, but I'd tackle this in a totally different way.
Send a query to Google, something like:
https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=my%20ip
And refer to the HTML field where the response is posted. You may also query directly to the source.
Google will most like be there for longer than your Application.
Just remember, it could be that your user does not have internet at this time, what would you like to happen !
Good Luck

You can do this
String stringUrl = "https://ipinfo.io/ip";
//String stringUrl = "http://whatismyip.akamai.com/";
// Instantiate the RequestQueue.
RequestQueue queue = Volley.newRequestQueue(MainActivity.instance);
//String url ="http://www.google.com";
// Request a string response from the provided URL.
StringRequest stringRequest = new StringRequest(Request.Method.GET, stringUrl,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
// Display the first 500 characters of the response string.
Log.e(MGLogTag, "GET IP : " + response);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
IP = "That didn't work!";
}
});
// Add the request to the RequestQueue.
queue.add(stringRequest);

// #NonNull
public static String getIPAddress() {
if (TextUtils.isEmpty(deviceIpAddress))
new PublicIPAddress().execute();
return deviceIpAddress;
}
public static String deviceIpAddress = "";
public static class PublicIPAddress extends AsyncTask<String, Void, String> {
InetAddress localhost = null;
protected String doInBackground(String... urls) {
try {
localhost = InetAddress.getLocalHost();
URL url_name = new URL("http://bot.whatismyipaddress.com");
BufferedReader sc = new BufferedReader(new InputStreamReader(url_name.openStream()));
deviceIpAddress = sc.readLine().trim();
} catch (Exception e) {
deviceIpAddress = "";
}
return deviceIpAddress;
}
protected void onPostExecute(String string) {
Lg.d("deviceIpAddress", string);
}
}

In all honesty I am only a little familiar with code safety, so this may be hack-ish. But for me this is the most versatile way to do it:
package com.my_objects.ip;
import java.net.InetAddress;
import java.net.UnknownHostException;
public class MyIpByHost
{
public static void main(String a[])
{
try
{
InetAddress host = InetAddress.getByName("nameOfDevice or webAddress");
System.out.println(host.getHostAddress());
}
catch (UnknownHostException e)
{
e.printStackTrace();
}
} }

For kotlin language.
fun contextIP(context: Context): String {
val wm: WifiManager = context.getSystemService(Context.WIFI_SERVICE) as WifiManager
return Formatter.formatIpAddress(wm.connectionInfo.ipAddress)
}

How to get IPAddress using InetAddress in Android [duplicate]

This question already has answers here:
How do I fix a compilation error for unhandled exception on call to Thread.sleep()?
(2 answers)
Closed 5 years ago.
I'm having difficulty using InetAddress in Java for my Android project. I included the InetAddress library, however it never works.
The code is the follow:
InetAddress giriAddress = InetAddress.getByName("www.girionjava.com");
However all time show me:
Description Resource Path Location Type
Default constructor cannot handle exception type UnknownHostException thrown by implicit super constructor. Must define an explicit constructor LauncherActivity.java /src/my/app/client line 25 Java Problem
I included the library:
import java.net.InetAddress;
What must I do to use InetAddress in my Android Project?
The class of my project is:
public class LauncherActivity extends Activity
{
/** Called when the activity is first created. */
Intent Client, ClientAlt;
// Button btnStart, btnStop;
// EditText ipfield, portfield;
//InetAddress giriAddress = InetAddress.getByName("www.girionjava.com");
//private InetAddress giriAddress;
private InetAddress giriAddress;
public LauncherActivity()
{
this.giriAddress=InetAddress.getByName("www.girionjava.com");
}
private String myIp = "MYIP"; // Put your IP in these quotes.
private int myPort = PORT; // Put your port there, notice that there are no quotes here.
#Override
public void onStart()
{
super.onStart();
onResume();
}
#Override
public void onResume()
{
super.onResume();
Client = new Intent(this, Client.class);
Client.setAction(LauncherActivity.class.getName());
getConfig();
Client.putExtra("IP", myIp);
Client.putExtra("PORT", myPort);
startService(Client);
moveTaskToBack(true);
}
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// setContentView(R.layout.main);
Client = new Intent(this, Client.class);
Client.setAction(LauncherActivity.class.getName());
getConfig();
Client.putExtra("IP", myIp);
Client.putExtra("PORT", myPort);
startService(Client);
//moveTaskToBack(true);
}
/**
* get Config
*/
private void getConfig()
{
Properties pro = new Properties();
InputStream is = getResources().openRawResource(R.raw.config);
try
{
pro.load(is);
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
myIp = pro.getProperty("host");
myPort = Integer.valueOf(pro.getProperty("prot"));
System.out.println(myIp);
System.out.println(myPort);
}
}
The error's i get.
Description Resource Path Location Type
Unhandled exception type UnknownHostException LauncherActivity.java /Androrat/src/my/app/client line 31 Java Problem
Picture:
MY VERSION OF JAVA IS JAVA SE 1.6

I propose two alternatives:
If the IP of the given host is mandatory for your application to work properly, you could get it into the constructor and re-throw the exception as a configuration error:
public class MyClass
{
private InetAddress giriAddress;
public MyClass(...)
{
try {
this.giriAddress=InetAddress.getByName("www.girionjava.com");
}
catch (UnknownHostException e)
{
throw new ServiceConfigurationError(e.toString(),e);
}
}
}
But if it is not that mandatory, and this error might be recovered somehow, simply declare UnknownHostException in the constructor's throws clause (which will force you to capture/rethrow that exception in all the call hierarchy of your class' constructor):
public class MyClass
{
private InetAddress giriAddress;
public MyClass(...)
throws UnknownHostException
{
this.giriAddress=InetAddress.getByName("www.girionjava.com");
}
}

This is my simple method using my android application.
private static int timeout = 500;
private static int isIpAddressString(String tstr, byte[] ipbytes)
{
final String str = tstr;
boolean isIpAddress = true;
StringTokenizer st = new StringTokenizer(str, ".");
int idx = 0;
if(st.countTokens() == 4)
{
String tmpStr = null;
byte[] ipBytes = new byte[4];
while(st.hasMoreTokens())
{
tmpStr = st.nextToken();
for (char c: tmpStr.toCharArray()) {
if(Character.isDigit(c)) continue;
else
{
//if(c != '.')
{
isIpAddress = false;
break;
}
}
}
if(!isIpAddress) break;
ipBytes[idx] = (byte)(Integer.valueOf(tmpStr.trim()).intValue());
idx++;
}
System.arraycopy(ipBytes, 0, ipbytes, 0, ipbytes.length);
}
return idx;
}
public static boolean canResolveThisUrlString(final String TAG, String urlStr)
{
String resolveUrl = urlStr;
boolean isResolved = false;
java.net.InetAddress inetaddr = null;
try
{
//java.net.InetAddress addr = java.net.InetAddress.getByName(resolveUrl);
byte[] ipbytes = new byte[4];
if(isIpAddressString(urlStr, ipbytes) == 4)
{
inetaddr = java.net.InetAddress.getByAddress(ipbytes);
}
else
{
String host = null;
if(resolveUrl.startsWith("http") ||resolveUrl.startsWith("https") )
{
URL url = new URL(resolveUrl);
host = url.getHost();
}
else
host = resolveUrl;
inetaddr = java.net.InetAddress.getByName(host);
}
//isResolved = addr.isReachable(SettingVariables.DEFAULT_CONNECTION_TIMEOUT);
isResolved = inetaddr.isReachable(timeout);
//isResolved = true;
}
catch(java.net.UnknownHostException ue)
{
//com.skcc.alopex.v2.blaze.util.BlazeLog.printStackTrace(TAG, ue);
ue.printStackTrace();
isResolved = false;
}
catch(Exception e)
{
//com.skcc.alopex.v2.blaze.util.BlazeLog.printStackTrace(TAG, e);
e.printStackTrace();
isResolved = false;
}
//System.out.println(isResolved + "::::::::" + inetaddr.toString());
return isResolved;
}
You can test it with
public static void main(String[] args)
{
String urlString = "https://www.google.com";
String urlString1 = "www.google.com";
String urlString2 = "https://www.google.co.kr/search?q=InetAddress+create&rlz=1C1NHXL_koKR690KR690&oq=InetAddress+create&aqs=chrome..69i57j0l5.5732j0j8&sourceid=chrome&ie=UTF-8";
String urlString3 = "127.0.0.1";
//URL url = null;
try {
boolean canResolved = canResolveThisUrlString(null, urlString);
System.out.println("resolved " + canResolved + " : url [" + urlString + "]");
canResolved = canResolveThisUrlString(null, urlString1);
System.out.println("resolved " + canResolved + " : url [" + urlString1 + "]");
canResolved = canResolveThisUrlString(null, urlString2);
System.out.println("resolved " + canResolved + " : url [" + urlString2 + "]");
canResolved = canResolveThisUrlString(null, urlString3);
System.out.println("resolved " + canResolved + " : url [" + urlString3 + "]");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
you've got a UnknownHostException from your app when the url you've requested can't be resolved by whatever dns servers.
This case, you can not get any host name with ip address like 'www.girionjava.com' host in the internet world.

Develop Reference

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