How to know if a network adapter is connected

Hello,

I'm writting this message because i 'm making a project using evc and
winsock.

In fact i use a dhcp server with two network card:
-one card is an ethernet card.
-the second is using USB rndis.

For my dhcp server i need to know the interface which is connected.
At the beginning, i use

addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(67);

if (SOCKET_ERROR == bind(sock, (LPSOCKADDR)&addr, sizeof(addr)))
{
ErrorMsg("Windows Sockets error %d: Couldn't bind thread socket.",
WSAGetLastError());
closesocket(sock);
return 0;
}

So after i'm waiting for receiving data:

while (!g_stopDHCP)
{

//if ((len=safe_recv(sock, buf, 548, 0, 1000))>0)
if ((len=recv(sock, buf, 548, 0))>0)
{

......



}

But i need to know which interface (the ethernet card or USB) is connected ?
I need to know that because the address that i give is different for each
connection.


Thanks to help me please.

F.


.

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