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Diffstat (limited to 'master/src/main/java/com/orbekk/Broadcast.java')
-rw-r--r--master/src/main/java/com/orbekk/Broadcast.java55
1 files changed, 55 insertions, 0 deletions
diff --git a/master/src/main/java/com/orbekk/Broadcast.java b/master/src/main/java/com/orbekk/Broadcast.java
new file mode 100644
index 0000000..bacde0d
--- /dev/null
+++ b/master/src/main/java/com/orbekk/Broadcast.java
@@ -0,0 +1,55 @@
+package com.orbekk;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+
+import org.apache.log4j.Logger;
+
+import android.content.Context;
+import android.net.DhcpInfo;
+import android.net.wifi.WifiManager;
+
+public class Broadcast {
+ private Context context;
+ private Logger logger = Logger.getLogger(getClass());
+
+ public Broadcast(Context context) {
+ this.context = context;
+ }
+
+ public InetAddress getBroadcastAddress() {
+ WifiManager wifi = (WifiManager)context.getSystemService(Context.WIFI_SERVICE);
+ DhcpInfo dhcp = wifi.getDhcpInfo();
+
+ int broadcast = (dhcp.ipAddress & dhcp.netmask) | ~dhcp.netmask;
+ byte[] quads = new byte[4];
+ for (int k = 0; k < 4; k++)
+ quads[k] = (byte) ((broadcast >> k * 8) & 0xFF);
+ try {
+ return InetAddress.getByAddress(quads);
+ } catch (UnknownHostException e) {
+ logger.warn("Failed to find broadcast address.");
+ return null;
+ }
+ }
+
+ public boolean sendBroadcast(byte[] data, int port) {
+ try {
+ DatagramSocket socket = new DatagramSocket(port);
+ socket.setBroadcast(true);
+ DatagramPacket packet = new DatagramPacket(data, data.length, getBroadcastAddress(), port);
+ socket.send(packet);
+ return true;
+ } catch (SocketException e) {
+ logger.warn("Failed to send broadcast.", e.fillInStackTrace());
+ return false;
+ } catch (IOException e) {
+ logger.warn("Error when sending broadcast.", e.fillInStackTrace());
+ return false;
+ }
+ }
+} \ No newline at end of file