--- At Thu, 20 Apr 2006 13:33:57 -0700, Josh Graessley wrote:
>* PGP Signed by an unverified key: 04/20/06 at 13:33:58
>
>While this may not help with the Cisco VPN, you should consider
>asking the stack itself what the local IP addresses are, not system
>config. It is possible that people may use ifconfig to bypass system
>config and your software should do its best to live in this
>environment. There is one other bit to keep in mind, the local
>address will depend on the destination. Some VPNs are set to only
>route traffic to a certain subnet. There are two good ways to get
>this information. The first is to connect a socket, forcing the stack
>to pick a local address to bind to. You can get the local address
>using getsockname. The other good way to do this is to use a routing
>socket to get the route entry for a destination address you are
>interested in. If you are simply interested in listening for inbound
>connections on all local addresses, your best bet is to either bind
>to the INADDR_ANY address (all zeros) or use getifaddrs to get a list
>of the local addresses to bind to.
I have an interesting situation that I've been trying to solve.
I have a small http server open on a socket. But I need to send a
message to another machine that indicates what the address is that they
are to connect to in order to use this http server. The information is
specified to be a complete URL.
I open the listening socket for the http server using INADDR_ANY. When I
use getsockname() I get INADDR_ANY (ie 0 (I think)) for the IP address.
Needless to say, this isn't useful.
What is the best way for me to get the IP address that the other end
would use? Would a routing socket be the best way? But doesn't that
require root/authenticated access? Is there another, simpler way?
Thanks,
...Duane
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