/** 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if (!key.isValid()) throw new IllegalStateException("key is no longer valid");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();
}
}
}
/** Unblock given source. */
void unblock(MembershipKeyImpl key, InetAddress source) {
assert key.channel() == this;
assert key.sourceAddress() == null;
synchronized (stateLock) {
if (!key.isValid()) throw new IllegalStateException("key is no longer valid");
try {
if (key instanceof MembershipKeyImpl.Type6) {
MembershipKeyImpl.Type6 key6 = (MembershipKeyImpl.Type6) key;
Net.unblock6(fd, key6.groupAddress(), key6.index(), Net.inet6AsByteArray(source));
} else {
MembershipKeyImpl.Type4 key4 = (MembershipKeyImpl.Type4) key;
Net.unblock4(fd, key4.groupAddress(), key4.interfaceAddress(), Net.inet4AsInt(source));
}
} catch (IOException ioe) {
// should not happen
throw new AssertionError(ioe);
}
}
}