Mailing Lists: Apple Mailing Lists
Image of Mac OS face in stamp
 
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

NKE - Socket filter - get local address problem.

HOWEVER - I am unable to obtain the local address at this point.

I have used
 err = sock_getsockname(so, (struct sockaddr *) &local, (int)&len);
but I keep getting <0.0.0.0> as a result.

optionally is there another call back where I can examine both addresses and change the <to> prior to bind? 
Erez,

The problem is that the kernel performs an implicit bind when the socket is connected if no local name is assigned to the socket already. Your NKE connect_out callback is being called when the client application calls connect() (inside the syscall basically), so unless the client application performs a bind() first (which is rarely done for outbound connects) the socket will not have a local address assigned to it. The kernel will assign one later during the actual connect. You can obtain the local address later inside of sf_notify, when you get a notification that the socket has gone into the connected state, but not before (as far as I know).

In short, there is no way to both redirect the socket (which can only be done in the connect_out callback) and use the source ip:port. Can you explain why you need the source ip:port?

Ryan


_______________________________________________
Do not post admin requests to the list. They will be ignored.
Darwin-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/darwin-dev/email@hidden

This email sent to email@hidden


Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2007 Apple Inc. All rights reserved.