On Mon, 15 Aug 2005 17:14:42 +0000 Albrecht Dreß <albrecht.dress@xxxxxxxx> wrote: > Am 15.08.05 12:14 schrieb(en) Henrik Nordstrom: > > Why is the link layer important at all in the protocol if the packet is > > an UDP/IP (PF_INET,SOCK_DGRAM) packet? > > Due to this crazy protocol: the MAC addresses are used as some kind of > "authentication". In the *reply* udp packet data, the micro adds its own > mac and the mac of the requesting machine retreived from the incoming > packet. The other end is a winbloze app which apparently uses the two > mac's to determine whether the packet should be handles or not. It > obvoisly had the same problems to determine the source mac, so it's > encoded properly in the reply, but not in the request... > > I know this protocol is really broken, but unfortunately I must keep > compatibility. Sigh! > > Thaks a lot for your suggestions, > cheers, > > Albrecht. Since you need access to the whole packet, don't use a UDP socket but instead AF_PACKET. You will need to decode/encode the whole UDP/IP headers but that is relatively easy. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
