1 files changed, 51 insertions, 0 deletions

diff --git a/src/main/java/de/pixart/messenger/xmpp/jingle/DirectConnectionUtils.java b/src/main/java/de/pixart/messenger/xmpp/jingle/DirectConnectionUtils.java
new file mode 100644
index 000000000..3292e65e4
--- /dev/null
+++ b/src/main/java/de/pixart/messenger/xmpp/jingle/DirectConnectionUtils.java
@@ -0,0 +1,51 @@
+package de.pixart.messenger.xmpp.jingle;
+
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.SocketException;
+import java.security.SecureRandom;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.UUID;
+
+import rocks.xmpp.addr.Jid;
+
+public class DirectConnectionUtils {
+
+    private static List<InetAddress> getLocalAddresses() {
+        final List<InetAddress> addresses = new ArrayList<>();
+        final Enumeration<NetworkInterface> interfaces;
+        try {
+            interfaces = NetworkInterface.getNetworkInterfaces();
+        } catch (SocketException e) {
+            return addresses;
+        }
+        while (interfaces.hasMoreElements()) {
+            NetworkInterface networkInterface = interfaces.nextElement();
+            final Enumeration<InetAddress> inetAddressEnumeration = networkInterface.getInetAddresses();
+            while (inetAddressEnumeration.hasMoreElements()) {
+                final InetAddress inetAddress = inetAddressEnumeration.nextElement();
+                if (!inetAddress.isLoopbackAddress()) {
+                    addresses.add(inetAddress);
+                }
+            }
+        }
+        return addresses;
+    }
+
+    public static List<JingleCandidate> getLocalCandidates(Jid jid) {
+        SecureRandom random = new SecureRandom();
+        ArrayList<JingleCandidate> candidates = new ArrayList<>();
+        for (InetAddress inetAddress : getLocalAddresses()) {
+            final JingleCandidate candidate = new JingleCandidate(UUID.randomUUID().toString(), true);
+            candidate.setHost(inetAddress.getHostAddress());
+            candidate.setPort(random.nextInt(60000) + 1024);
+            candidate.setType(JingleCandidate.TYPE_DIRECT);
+            candidate.setJid(jid);
+            candidate.setPriority(8257536 + candidates.size());
+            candidates.add(candidate);
+        }
+        return candidates;
+    }
+}
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