Message8521

Netty4 is strange... you can bind its ServerBootstrap with an Inet4Address, but when you query the Channel it returns for its local address, you get an Inet6Address!

Here's a print-peppered _realsocket.listen() method:

def listen(self, backlog):
    # ...
    print 'Binding to {:s} with type {:s}'.format(repr(self.bind_addr.getAddress()), type(self.bind_addr.getAddress()))
    future = b.bind(self.bind_addr.getAddress(), self.bind_addr.getPort())

    # ...

    self.channel = future.channel()
    localaddr = self.channel.localAddress()
    print 'The channel is bound to {:s} with type {:s}'.format(repr(localaddr.getAddress()), type(localaddr.getAddress()))

    # ...


And what you get when you execute that modified method:

Binding to /0.0.0.0 with type <type 'java.net.Inet4Address'>
The channel is bound to /0:0:0:0:0:0:0:0 with type <type 'java.net.Inet6Address'>


And that's why you get an IPv6 '0' address from getsockname() after binding it with IPv4 '0' address.