Damjan Jovanovic wrote:
Hi
Is this the right place to discuss/post patches for Java 1.7? If not,
what is? Sun's websites are so confusing...
Yes, this is right place.
Has there been any work on the bug I referred to in the subject? If
not, read on.
Michael McMahon is probably the best person to reply to you on this.
Last year he had a proposal and implementation that updated
DatagramPacket with methods to obtain the datagram destination address
and the network interface that it was received on. I believe he parked
it temporarily to work on some higher priority tasks with a view to
coming back to it later. [ Michael - can you give an updated status on
this? ]
:
Also java.nio.channels.DatagramChannel seems very limited compared to
java.net.DatagramSocket, is it worth patching?
DatagramChannel is more suited to applications where the socket is
connected or where non-blocking is required. Aside a DHCP server, I
haven't come across many applications needing access to the ancillary
data. If required then it would be possible to have DatagramChannel
define a new receive method that returns this information but it may not
be worth it.
>From what I've observed in Java 1.6 on Linux,
java.net.NetworkInterface.getNetworkInterfaces() doesn't list
interfaces without an IP address, even if they are up. The
documentation says it will list all interfaces, so is this a bug?
The specification should probably be clarified here as that assertion
may be too strong or ambiguous. On Linux, the interfaces are enumerated
using the SIOCGIFCONF ioctl which, if I recall, is tied to the socket
protocol and so only returns address with IPv4 addresses (to check this
I would suggest stepping through in the debugger to see the names and
index of the interfaces that are returned). When this was implemented
back in 1.4 I recall the equivalent ioctl to get interfaces with IPv6
addresses wasn't implemented on Linux so we had to pull this from /proc.
-Alan.
