I've run into a problem on IPv4 OS X 10.6. I haven't tested IPv6. It appears that a socket bound to a multicast address is unable to send data -- sendto() fails with EADDRNOTAVAIL when sending to a unicast or multicast address. This worked in 10.5 and 10.4, and of course works on Linux and Windows. If the socket is bound to an interface address, the sendto works as expected, no matter the destination address. The only code this seems to affect is slpd_incoming.c : IncomingDatagramRead(), where the unicast response is sent on the receiving socket. I could use the SLPDOutgoingConnect/SLPDOutgoingDatagramWrite mechanism to attempt to fix this, but this seems a bit overkill for what was originally a sendto(). Since the last incoming socket is for unicast we might get away with sending to that one, but that seems a bit of a hack that will break later. Suggestions?
--Nick
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