Date: Tue, 26 Aug 1997 09:52:07 -0400 From: "Louis A. Mamakos" <louie@TransSys.COM> To: Aled Morris <aledm@routers.co.uk> Cc: hackers@FreeBSD.ORG Subject: Re: UDP "to" address? Message-ID: <199708261352.JAA04942@whizzo.TransSys.COM> In-Reply-To: Your message of "Tue, 26 Aug 1997 13:42:45 BST." <Pine.BSF.3.91.970826134032.21490D-100000@ns.uk.peer.net> References: <Pine.BSF.3.91.970826134032.21490D-100000@ns.uk.peer.net>
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Typically, a portable approach to doing this is to create a socket per interface address and bind it. Then you look at which fd the packet was received on to determine the destination address. Look at named and xntpd to get a sense of this. In fact, you can probably steal a lot of this code and apply it directly. There also seems to be a socket option you can set which returns the destination address in the "control information" field specified with recvmsg(2). I noticed the code for this in ip_input.c. louie
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