private DatagramChannel connectClient() throws IOException {
final DatagramChannel client =
address.isMulticastAddress()
? DatagramChannel.open(address.getAddress().length == 4 ? INET : INET6)
: DatagramChannel.open();
final InetSocketAddress hostAddress = new InetSocketAddress(port);
client.configureBlocking(false);
if (address.isMulticastAddress()) {
client.setOption(SO_REUSEADDR, true);
client.bind(hostAddress);
if (networkInterface != null) {
// This is probably not needed, because client socket doesn't send datagrams,
// but since EVERYBODY on the internet configures this for any channels, and
// I don't see any harm this config could make, I leave it here
client.setOption(IP_MULTICAST_IF, networkInterface);
client.join(address, networkInterface);
} else {
client.join(address, NetworkInterface.getByInetAddress(hostAddress.getAddress()));
}
if (LOG.isDebugEnabled()) LOG.debug("Connecting via multicast, group=" + address);
} else {
client.bind(hostAddress);
}
if (LOG.isDebugEnabled()) LOG.debug("Listening on port " + port);
closeables.add(client);
return client;
}
/** Block datagrams from given source if a memory to receive all datagrams. */
void block(MembershipKeyImpl key, InetAddress source) throws IOException {
assert key.channel() == this;
assert key.sourceAddress() == null;
synchronized (stateLock) {
if (!key.isValid()) throw new IllegalStateException("key is no longer valid");
if (source.isAnyLocalAddress())
throw new IllegalArgumentException("Source address is a wildcard address");
if (source.isMulticastAddress())
throw new IllegalArgumentException("Source address is multicast address");
if (source.getClass() != key.group().getClass())
throw new IllegalArgumentException("Source address is different type to group");
int n;
if (key instanceof MembershipKeyImpl.Type6) {
MembershipKeyImpl.Type6 key6 = (MembershipKeyImpl.Type6) key;
n = Net.block6(fd, key6.groupAddress(), key6.index(), Net.inet6AsByteArray(source));
} else {
MembershipKeyImpl.Type4 key4 = (MembershipKeyImpl.Type4) key;
n = Net.block4(fd, key4.groupAddress(), key4.interfaceAddress(), Net.inet4AsInt(source));
}
if (n == IOStatus.UNAVAILABLE) {
// ancient kernel
throw new UnsupportedOperationException();
}
}
}
/** Publish a request message to the specified multicast group. */
protected void publishRequest(String message) throws IOException, SocketException {
groupAddr = InetAddress.getByName(request_group);
interfaceAddr = InetAddress.getByName(request_interface_address);
/* is it a multicast address? */
if (groupAddr.isMulticastAddress()) {
/* open the socket and join the multicast group */
udpSocket = new MulticastSocket();
udpSocket.setNetworkInterface(NetworkInterface.getByInetAddress(interfaceAddr));
udpSocket.setInterface(interfaceAddr);
udpSocket.joinGroup(groupAddr);
/* Send request packet */
DatagramPacket p =
new DatagramPacket(message.getBytes(), message.getBytes().length, groupAddr, 7777);
System.out.println("Sending request: " + new String(p.getData(), 0, p.getLength()));
udpSocket.send(p);
} else {
System.err.println("Invalid multicast address: " + groupAddr.toString());
}
}
public static String[] getNetworkParams(NetworkInterface nic) {
List<InterfaceAddress> addrs = nic.getInterfaceAddresses();
if (addrs == null || addrs.size() == 0) {
return null;
}
InterfaceAddress addr = null;
for (InterfaceAddress iaddr : addrs) {
InetAddress inet = iaddr.getAddress();
if (!inet.isLinkLocalAddress()
&& !inet.isLoopbackAddress()
&& !inet.isMulticastAddress()
&& inet.getAddress().length == 4) {
addr = iaddr;
break;
}
}
if (addr == null) {
return null;
}
String[] result = new String[3];
result[0] = addr.getAddress().getHostAddress();
try {
byte[] mac = nic.getHardwareAddress();
result[1] = byte2Mac(mac);
} catch (Exception e) {
}
result[2] = prefix2Netmask(addr.getNetworkPrefixLength());
return result;
}
/**
* Joins a multicast group. Its behavior may be affected by {@code setInterface} or {@code
* setNetworkInterface}.
*
* <p>If there is a security manager, this method first calls its {@code checkMulticast} method
* with the {@code mcastaddr} argument as its argument.
*
* @param mcastaddr is the multicast address to join
* @exception IOException if there is an error joining or when the address is not a multicast
* address.
* @exception SecurityException if a security manager exists and its {@code checkMulticast} method
* doesn't allow the join.
* @see SecurityManager#checkMulticast(InetAddress)
*/
public void joinGroup(InetAddress mcastaddr) throws IOException {
if (isClosed()) {
throw new SocketException("Socket is closed");
}
checkAddress(mcastaddr, "joinGroup");
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkMulticast(mcastaddr);
}
if (!mcastaddr.isMulticastAddress()) {
throw new SocketException("Not a multicast address");
}
/**
* required for some platforms where it's not possible to join a group without setting the
* interface first.
*/
NetworkInterface defaultInterface = NetworkInterface.getDefault();
if (!interfaceSet && defaultInterface != null) {
setNetworkInterface(defaultInterface);
}
getImpl().join(mcastaddr);
}
// TODO: needs to be InetAddress[]
public InetAddress resolvePublishHostAddresses(String publishHosts[]) throws IOException {
if (publishHosts == null) {
if (GLOBAL_NETWORK_PUBLISHHOST_SETTING.exists(settings)
|| GLOBAL_NETWORK_HOST_SETTING.exists(settings)) {
// if we have settings use them (we have a fallback to GLOBAL_NETWORK_HOST_SETTING inline
publishHosts =
GLOBAL_NETWORK_PUBLISHHOST_SETTING.get(settings).toArray(Strings.EMPTY_ARRAY);
} else {
// next check any registered custom resolvers
for (CustomNameResolver customNameResolver : customNameResolvers) {
InetAddress addresses[] = customNameResolver.resolveDefault();
if (addresses != null) {
return addresses[0];
}
}
// we know it's not here. get the defaults
publishHosts =
GLOBAL_NETWORK_PUBLISHHOST_SETTING.get(settings).toArray(Strings.EMPTY_ARRAY);
}
}
InetAddress addresses[] = resolveInetAddresses(publishHosts);
// TODO: allow publishing multiple addresses
// for now... the hack begins
// 1. single wildcard address, probably set by network.host: expand to all interface addresses.
if (addresses.length == 1 && addresses[0].isAnyLocalAddress()) {
HashSet<InetAddress> all = new HashSet<>(Arrays.asList(NetworkUtils.getAllAddresses()));
addresses = all.toArray(new InetAddress[all.size()]);
}
// 2. try to deal with some (mis)configuration
for (InetAddress address : addresses) {
// check if its multicast: flat out mistake
if (address.isMulticastAddress()) {
throw new IllegalArgumentException(
"publish address: {"
+ NetworkAddress.format(address)
+ "} is invalid: multicast address");
}
// check if its a wildcard address: this is only ok if its the only address!
// (if it was a single wildcard address, it was replaced by step 1 above)
if (address.isAnyLocalAddress()) {
throw new IllegalArgumentException(
"publish address: {"
+ NetworkAddress.format(address)
+ "} is wildcard, but multiple addresses specified: this makes no sense");
}
}
// 3. if we end out with multiple publish addresses, select by preference.
// don't warn the user, or they will get confused by bind_host vs publish_host etc.
if (addresses.length > 1) {
List<InetAddress> sorted = new ArrayList<>(Arrays.asList(addresses));
NetworkUtils.sortAddresses(sorted);
addresses = new InetAddress[] {sorted.get(0)};
}
return addresses[0];
}
public int send(ByteBuffer src, SocketAddress target) throws IOException {
if (src == null) throw new NullPointerException();
synchronized (writeLock) {
ensureOpen();
InetSocketAddress isa = Net.checkAddress(target);
InetAddress ia = isa.getAddress();
if (ia == null) throw new IOException("Target address not resolved");
synchronized (stateLock) {
if (!isConnected()) {
if (target == null) throw new NullPointerException();
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
if (ia.isMulticastAddress()) {
sm.checkMulticast(ia);
} else {
sm.checkConnect(ia.getHostAddress(), isa.getPort());
}
}
} else { // Connected case; Check address then write
if (!target.equals(remoteAddress)) {
throw new IllegalArgumentException("Connected address not equal to target address");
}
return write(src);
}
}
int n = 0;
try {
begin();
if (!isOpen()) return 0;
writerThread = NativeThread.current();
do {
n = send(fd, src, isa);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
synchronized (stateLock) {
if (isOpen() && (localAddress == null)) {
localAddress = Net.localAddress(fd);
}
}
return IOStatus.normalize(n);
} finally {
writerThread = 0;
end((n > 0) || (n == IOStatus.UNAVAILABLE));
assert IOStatus.check(n);
}
}
}
private synchronized void addLocalAddress(InetAddress addr) {
int addrtype;
if (addr.isLoopbackAddress()) {
addrtype = HOSTMAP_LOOPBACK;
} else if (addr.isLinkLocalAddress()) {
addrtype = HOSTMAP_LINKLOCAL;
} else if (addr.isSiteLocalAddress()) {
addrtype = HOSTMAP_SITELOCAL;
} else if (addr.isMulticastAddress()) {
addrtype = HOSTMAP_MULTICAST;
} else {
addrtype = HOSTMAP_GLOBAL;
}
if (addr.getAddress().length == 4) {
addrtype |= HOSTMAP_IPV4;
} else {
addrtype |= HOSTMAP_IPV6;
}
String addrAsString = addr.getHostAddress();
fLocalHostAddresses.put(addrAsString, Integer.valueOf(addrtype | HOSTMAP_ADDR));
if (0 == (addrtype & (HOSTMAP_LINKLOCAL | HOSTMAP_SITELOCAL | HOSTMAP_MULTICAST))) {
// Don't do DNS Reverse Loopkup's for non-routable addresses.
// They won't be known to the Name Server anyway, and they
// make startup _much_ slower.
String addrAsNameCan = addr.getCanonicalHostName().toLowerCase();
// query the name after the canonical name, it will re-use
// cached canonical name (if the name was not explicitly set)
String addrAsName = addr.getHostName().toLowerCase();
if (!addrAsNameCan.equals(addrAsString)) {
// We must check if we really got a name, since InetAddress.getHostName()
// returns the original address in case it thinks the name is spoofed!
if (0 == (addrtype & HOSTMAP_LOOPBACK)) {
// Not loopback --> found a Canonical Name.
fLocalHostAddresses.put(
addrAsNameCan, Integer.valueOf(addrtype | HOSTMAP_NAME | HOSTMAP_CANONICALNAME));
// override the address as canonical-address
fLocalHostAddresses.put(
addrAsString, Integer.valueOf(addrtype | HOSTMAP_ADDR | HOSTMAP_CANONICALADDR));
} else {
// Loopback --> add the found name as non-canonical.
fLocalHostAddresses.put(addrAsNameCan, Integer.valueOf(addrtype | HOSTMAP_NAME));
}
}
if (!addrAsName.equals(addrAsString) && !addrAsName.equals(addrAsNameCan)) {
// don't override the canonical name by the name.
fLocalHostAddresses.put(addrAsName, Integer.valueOf(addrtype | HOSTMAP_NAME));
}
}
}
/**
* Leave a multicast group. Its behavior may be affected by <code>setInterface</code> or <code>
* setNetworkInterface</code>.
*
* <p>If there is a security manager, this method first calls its <code>checkMulticast</code>
* method with the <code>mcastaddr</code> argument as its argument.
*
* @param mcastaddr is the multicast address to leave
* @exception IOException if there is an error leaving or when the address is not a multicast
* address.
* @exception SecurityException if a security manager exists and its <code>checkMulticast</code>
* method doesn't allow the operation.
* @see SecurityManager#checkMulticast(InetAddress)
*/
public void leaveGroup(InetAddress mcastaddr) throws IOException {
if (isClosed()) {
throw new SocketException("Socket is closed");
}
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkMulticast(mcastaddr);
}
if (!mcastaddr.isMulticastAddress()) {
throw new SocketException("Not a multicast address");
}
getImpl().leave(mcastaddr);
}
/**
* Initialise the listener, including opening a multicast socket and joining the specified
* group.
*
* @throws IOException if the socket cannot be opened.
* @throws SocketException if there is a problem setting the interface or joining the multicast
* group.
*/
public void init() throws IOException, SocketException {
String request_interface_address = InetAddress.getLocalHost().getHostAddress();
groupListenRequestAddr = InetAddress.getByName(request_group);
interfaceListenRequestAddr = InetAddress.getByName(request_interface_address);
/* is it a multicast address? */
if (groupListenRequestAddr.isMulticastAddress()) {
udpListenRequestSocket = new MulticastSocket(request_port);
udpListenRequestSocket.setInterface(interfaceListenRequestAddr);
udpListenRequestSocket.joinGroup(groupListenRequestAddr);
} else {
System.err.println("Not a valid multicast address!");
}
}
public static void main(String[] args) {
if (args.length == 0 || args == null) {
System.out.println("Didn't enter argument!, Please enter like this.");
System.out.println("ex. java IPCharateristics args[0] args[1] ...");
return;
}
try {
InetAddress address = InetAddress.getByName(args[0]);
if (address.isAnyLocalAddress()) {
System.out.println(address + " is a wildcard address.");
}
if (address.isLoopbackAddress()) {
System.out.println(address + " is a loopback address.");
}
if (address.isLinkLocalAddress()) {
System.out.println(address + " is a link-local address.");
}
if (address.isSiteLocalAddress()) {
System.out.println(address + " is a site-local address");
} else {
System.out.println(address + " is a global address");
}
if (address.isMulticastAddress()) {
if (address.isMCGlobal()) {
System.out.println(address + " is a global multicast address.");
} else if (address.isMCOrgLocal()) {
System.out.println(address + " is an organization wide multicast address.");
} else if (address.isMCSiteLocal()) {
System.out.println(address + " is a site wide multicast address.");
} else if (address.isMCLinkLocal()) {
System.out.println(address + " is a subnet wide multicast address.");
} else if (address.isMCNodeLocal()) {
System.out.println(address + " is an interface-local multicast address.");
} else {
System.out.println(address + " is an unknown multicast address type.");
}
} else {
System.out.println(address + " is a unicast address.");
}
} catch (UnknownHostException ex) {
System.out.println("Could not resolve " + args[0]);
}
}
private Pair<String, Integer> validateUrl(String url) throws IllegalArgumentException {
try {
URI uri = new URI(url);
if (!uri.getScheme().equalsIgnoreCase("http") && !uri.getScheme().equalsIgnoreCase("https")) {
throw new IllegalArgumentException("Unsupported scheme for url");
}
int port = uri.getPort();
if (!(port == 80 || port == 443 || port == -1)) {
throw new IllegalArgumentException("Only ports 80 and 443 are allowed");
}
if (port == -1 && uri.getScheme().equalsIgnoreCase("https")) {
port = 443;
} else if (port == -1 && uri.getScheme().equalsIgnoreCase("http")) {
port = 80;
}
String host = uri.getHost();
try {
InetAddress hostAddr = InetAddress.getByName(host);
if (hostAddr.isAnyLocalAddress()
|| hostAddr.isLinkLocalAddress()
|| hostAddr.isLoopbackAddress()
|| hostAddr.isMulticastAddress()) {
throw new IllegalArgumentException("Illegal host specified in url");
}
if (hostAddr instanceof Inet6Address) {
throw new IllegalArgumentException(
"IPV6 addresses not supported (" + hostAddr.getHostAddress() + ")");
}
return new Pair<String, Integer>(host, port);
} catch (UnknownHostException uhe) {
throw new IllegalArgumentException("Unable to resolve " + host);
}
} catch (IllegalArgumentException iae) {
s_logger.warn("Failed uri validation check: " + iae.getMessage());
throw iae;
} catch (URISyntaxException use) {
s_logger.warn("Failed uri syntax check: " + use.getMessage());
throw new IllegalArgumentException(use.getMessage());
}
}
/**
* {@collect.stats} {@description.open} Connects this socket to a remote socket address (IP
* address + port number). Binds socket if not already bound.
*
* <p>{@description.close}
*
* @param addr The remote address.
* @param port The remote port
* @throws SocketException if binding the socket fails.
*/
private synchronized void connectInternal(InetAddress address, int port) throws SocketException {
if (port < 0 || port > 0xFFFF) {
throw new IllegalArgumentException("connect: " + port);
}
if (address == null) {
throw new IllegalArgumentException("connect: null address");
}
checkAddress(address, "connect");
if (isClosed()) return;
SecurityManager security = System.getSecurityManager();
if (security != null) {
if (address.isMulticastAddress()) {
security.checkMulticast(address);
} else {
security.checkConnect(address.getHostAddress(), port);
security.checkAccept(address.getHostAddress(), port);
}
}
if (!isBound()) bind(new InetSocketAddress(0));
// old impls do not support connect/disconnect
if (oldImpl) {
connectState = ST_CONNECTED_NO_IMPL;
} else {
try {
getImpl().connect(address, port);
// socket is now connected by the impl
connectState = ST_CONNECTED;
} catch (SocketException se) {
// connection will be emulated by DatagramSocket
connectState = ST_CONNECTED_NO_IMPL;
}
}
connectedAddress = address;
connectedPort = port;
}
/**
* Resolves {@code bindHosts} to a list of internet addresses. The list will not contain duplicate
* addresses.
*
* @param bindHosts list of hosts to bind to. this may contain special pseudo-hostnames such as
* _local_ (see the documentation). if it is null, it will be populated based on global
* default settings.
* @return unique set of internet addresses
*/
public InetAddress[] resolveBindHostAddresses(String bindHosts[]) throws IOException {
// first check settings
if (bindHosts == null) {
if (GLOBAL_NETWORK_BINDHOST_SETTING.exists(settings)
|| GLOBAL_NETWORK_HOST_SETTING.exists(settings)) {
// if we have settings use them (we have a fallback to GLOBAL_NETWORK_HOST_SETTING inline
bindHosts = GLOBAL_NETWORK_BINDHOST_SETTING.get(settings).toArray(Strings.EMPTY_ARRAY);
} else {
// next check any registered custom resolvers
for (CustomNameResolver customNameResolver : customNameResolvers) {
InetAddress addresses[] = customNameResolver.resolveDefault();
if (addresses != null) {
return addresses;
}
}
// we know it's not here. get the defaults
bindHosts = GLOBAL_NETWORK_BINDHOST_SETTING.get(settings).toArray(Strings.EMPTY_ARRAY);
}
}
InetAddress addresses[] = resolveInetAddresses(bindHosts);
// try to deal with some (mis)configuration
for (InetAddress address : addresses) {
// check if its multicast: flat out mistake
if (address.isMulticastAddress()) {
throw new IllegalArgumentException(
"bind address: {" + NetworkAddress.format(address) + "} is invalid: multicast address");
}
// check if its a wildcard address: this is only ok if its the only address!
if (address.isAnyLocalAddress() && addresses.length > 1) {
throw new IllegalArgumentException(
"bind address: {"
+ NetworkAddress.format(address)
+ "} is wildcard, but multiple addresses specified: this makes no sense");
}
}
return addresses;
}
private static boolean shouldInclude(
InetAddress ia,
boolean includeSiteLocal,
boolean includeLoopbackAndWildcard,
boolean includeIPv6) {
return (!ia.isLinkLocalAddress())
&& // 169.254.x.x
(!ia.isMulticastAddress())
&& (includeLoopbackAndWildcard || ((!ia.isAnyLocalAddress()) && (!ia.isLoopbackAddress())))
&& (includeSiteLocal
|| ((!ia.isSiteLocalAddress())
&&
// disallow fc00::/8 and fd00::/8 (Unique local addresses RFC 4193)
// not recognized as local by InetAddress
(ia.getAddress().length != 16 || (ia.getAddress()[0] & 0xfe) != 0xfc)))
&&
// Hamachi 5/8 allocated to RIPE (30 November 2010)
// Removed from TransportImpl.isPubliclyRoutable()
// Check moved to here, for now, but will eventually need to
// remove it from here also.
// (includeLocal ||
// (!ia.getHostAddress().startsWith("5."))) &&
(includeIPv6 || (ia instanceof Inet4Address));
}
private String validateUrl(String url) {
try {
URI uri = new URI(url);
if ((uri.getScheme() == null)
|| (!uri.getScheme().equalsIgnoreCase("http")
&& !uri.getScheme().equalsIgnoreCase("https")
&& !uri.getScheme().equalsIgnoreCase("file"))) {
throw new IllegalArgumentException("Unsupported scheme for url: " + url);
}
int port = uri.getPort();
if (!(port == 80 || port == 443 || port == -1)) {
throw new IllegalArgumentException("Only ports 80 and 443 are allowed");
}
String host = uri.getHost();
try {
InetAddress hostAddr = InetAddress.getByName(host);
if (hostAddr.isAnyLocalAddress()
|| hostAddr.isLinkLocalAddress()
|| hostAddr.isLoopbackAddress()
|| hostAddr.isMulticastAddress()) {
throw new IllegalArgumentException("Illegal host specified in url");
}
if (hostAddr instanceof Inet6Address) {
throw new IllegalArgumentException(
"IPV6 addresses not supported (" + hostAddr.getHostAddress() + ")");
}
} catch (UnknownHostException uhe) {
throw new IllegalArgumentException("Unable to resolve " + host);
}
return uri.toString();
} catch (URISyntaxException e) {
throw new IllegalArgumentException("Invalid URL " + url);
}
}
private static boolean isGoodV6Address(InetAddress address) {
return address instanceof Inet6Address
&& !address.isAnyLocalAddress()
&& !address.isLoopbackAddress()
&& !address.isMulticastAddress();
}
public static boolean isValidIp(long addr) {
InetAddress ip = getAddressFromLong(addr);
return !ip.isLoopbackAddress() && !ip.isMulticastAddress();
}
/** (thread entry-point) */
private void multicastReceiverThreadMain() {
while (_enabled) {
MulticastSocket socket = null;
try {
synchronized (_lock) {
// clear flag regardless
_recycleReceiver = false;
}
socket = createMulticastSocket(s_receiveSocketlabel, s_interface, MDNS_PORT);
synchronized (_lock) {
// make sure not flagged since reset
if (_recycleReceiver) {
Stream.safeClose(socket);
continue;
}
_receiveSocket = socket;
}
while (_enabled) {
DatagramPacket dp = UDPPacketRecycleQueue.instance().getReadyToUsePacket();
// ('returnPacket' will be called in 'catch' or later after use in thread-pool)
try {
socket.receive(dp);
} catch (Exception exc) {
UDPPacketRecycleQueue.instance().returnPacket(dp);
throw exc;
}
InetAddress recvAddr = dp.getAddress();
if (recvAddr.isMulticastAddress()) {
s_multicastInData.addAndGet(dp.getLength());
s_multicastInOps.incrementAndGet();
} else {
s_unicastInData.addAndGet(dp.getLength());
s_unicastInOps.incrementAndGet();
}
// check whether it's external i.e. completely different IP address
// (local multicasting would almost always be reliable)
MulticastSocket otherLocal = _sendSocket;
boolean isLocal = (otherLocal != null && recvAddr.equals(otherLocal.getLocalAddress()));
// update counter which is used to detect silence
if (!isLocal) _lastExternalMulticastPacket = System.nanoTime();
enqueueForProcessing(dp, s_receiveSocketlabel);
} // (inner while)
} catch (Exception exc) {
// (timeouts and general IO problems)
// clean up regardless
Stream.safeClose(socket);
synchronized (_lock) {
if (!_enabled) break;
if (_recycleReceiver)
_logger.info(s_receiveSocketlabel + " was gracefully closed. Will reinitialise...");
else
_logger.warn(
s_receiveSocketlabel
+ " receive failed; this may be a transitional condition. Will reinitialise... message was '"
+ exc.toString()
+ "'");
// set flag
_recycleSender = true;
// "signal" other thread
Stream.safeClose(_sendSocket);
// stagger retry
Threads.waitOnSync(_lock, 333);
}
}
} // (outer while)
_logger.info("This thread has run to completion.");
} // (method)
/** Joins channel's socket to the given group/interface and optional source address. */
private MembershipKey innerJoin(InetAddress group, NetworkInterface interf, InetAddress source)
throws IOException {
if (!group.isMulticastAddress())
throw new IllegalArgumentException("Group not a multicast address");
// check multicast address is compatible with this socket
if (group instanceof Inet4Address) {
if (family == StandardProtocolFamily.INET6 && !Net.canIPv6SocketJoinIPv4Group())
throw new IllegalArgumentException("IPv6 socket cannot join IPv4 multicast group");
} else if (group instanceof Inet6Address) {
if (family != StandardProtocolFamily.INET6)
throw new IllegalArgumentException("Only IPv6 sockets can join IPv6 multicast group");
} else {
throw new IllegalArgumentException("Address type not supported");
}
// check source address
if (source != null) {
if (source.isAnyLocalAddress())
throw new IllegalArgumentException("Source address is a wildcard address");
if (source.isMulticastAddress())
throw new IllegalArgumentException("Source address is multicast address");
if (source.getClass() != group.getClass())
throw new IllegalArgumentException("Source address is different type to group");
}
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkMulticast(group);
synchronized (stateLock) {
if (!isOpen()) throw new ClosedChannelException();
// check the registry to see if we are already a member of the group
if (registry == null) {
registry = new MembershipRegistry();
} else {
// return existing membership key
MembershipKey key = registry.checkMembership(group, interf, source);
if (key != null) return key;
}
MembershipKeyImpl key;
if ((family == StandardProtocolFamily.INET6)
&& ((group instanceof Inet6Address) || Net.canJoin6WithIPv4Group())) {
int index = interf.getIndex();
if (index == -1) throw new IOException("Network interface cannot be identified");
// need multicast and source address as byte arrays
byte[] groupAddress = Net.inet6AsByteArray(group);
byte[] sourceAddress = (source == null) ? null : Net.inet6AsByteArray(source);
// join the group
int n = Net.join6(fd, groupAddress, index, sourceAddress);
if (n == IOStatus.UNAVAILABLE) throw new UnsupportedOperationException();
key =
new MembershipKeyImpl.Type6(
this, group, interf, source, groupAddress, index, sourceAddress);
} else {
// need IPv4 address to identify interface
Inet4Address target = Net.anyInet4Address(interf);
if (target == null) throw new IOException("Network interface not configured for IPv4");
int groupAddress = Net.inet4AsInt(group);
int targetAddress = Net.inet4AsInt(target);
int sourceAddress = (source == null) ? 0 : Net.inet4AsInt(source);
// join the group
int n = Net.join4(fd, groupAddress, targetAddress, sourceAddress);
if (n == IOStatus.UNAVAILABLE) throw new UnsupportedOperationException();
key =
new MembershipKeyImpl.Type4(
this, group, interf, source, groupAddress, targetAddress, sourceAddress);
}
registry.add(key);
return key;
}
}