package eu.siacs.conversations.xmpp.jingle; import java.net.Inet6Address; import java.net.InetAddress; import java.net.NetworkInterface; import java.net.SocketException; import java.net.UnknownHostException; import java.security.SecureRandom; import java.util.ArrayList; import java.util.Enumeration; import java.util.List; import java.util.UUID; import eu.siacs.conversations.xmpp.Jid; public class DirectConnectionUtils { private static List getLocalAddresses() { final List addresses = new ArrayList<>(); final Enumeration interfaces; try { interfaces = NetworkInterface.getNetworkInterfaces(); } catch (SocketException e) { return addresses; } while (interfaces.hasMoreElements()) { NetworkInterface networkInterface = interfaces.nextElement(); final Enumeration inetAddressEnumeration = networkInterface.getInetAddresses(); while (inetAddressEnumeration.hasMoreElements()) { final InetAddress inetAddress = inetAddressEnumeration.nextElement(); if (inetAddress.isLoopbackAddress() || inetAddress.isLinkLocalAddress()) { continue; } if (inetAddress instanceof Inet6Address) { //let's get rid of scope try { addresses.add(Inet6Address.getByAddress(inetAddress.getAddress())); } catch (UnknownHostException e) { //ignored } } else { addresses.add(inetAddress); } } } return addresses; } public static List getLocalCandidates(Jid jid) { SecureRandom random = new SecureRandom(); ArrayList 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; } }