Question

1. When receiving a packet on an unconnected UDP socket bound to 0.0.0.0/INADDR_ANY, how can I determine what the local IP it was sent to?
2. Can I determine what interface it was received on?
3. Can this be also be done for connection-oriented sockets such as TCP?

Update0

1. Platform is Linux, so language is irrelevant but C is native.
2. UDP sockets are bound to INADDR_ANY host, so getsockname() returns 0.0.0.0.

Answer 1

Hmmm, have a look at this. So looks like there is probably a socket option, at least in the Linux/Unix world. What OSes does it need to work on?