Date: Wed, 09 Jul 2003 12:18:01 +0300 From: Alin-Adrian Anton <aanton@reversedhell.net> To: freebsd-hackers@freebsd.org Subject: tcp raw socket programming recvfrom() Message-ID: <3F0BDDC9.9080102@reversedhell.net>
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Hey folks, I wrote my piece of code to play with, and it uses raw sockets to send TCP packets. It sends packets okay, everything tested with a sniffer, everything is really really fine, but it seems I cannot recvfrom anything. I mean, it just keeps waiting and doesn't see the reply the server is actually sending (can be seen with a sniffer). I read that the freebsd kernel does not duplicate any incoming TCP/UDP packets to any of the opened raw sockets. Is that true? So the only solution is to use the interface in promiscuous mode and sniff like a sniffer for the expected packet? Is there any other way? PS: ICMP gets received well with recvfrom (tested). On Linux, it does work for tcp/udp too with recvfrom. I was also wondering if anyone could help me understand why this behaviour in freebsd? (or *BSD) Thanks! Best Regards, Alin.
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