On Sun, 7 Sep 2003, Lev Walkin wrote:
LW> > [all below is for 4-STABLE] LW> > LW> > I'm trying to write effective arp scanner for multi-interface router (esp. LW> > multi-vlan); I plan to use multiple bpf devices attached to different LW> > interfaces emitting ARP requests and filters listening to ARP replies; the most LW> > natural way to multiplex them for me is select(). LW> > LW> > However, my tests show that select()ing bpf fd does not lead to trigger packets LW> > available to bpf filter; the process hangs in select state while parallel LW> > tcpdump process shows packets desired *and* is in bpf state. LW> > LW> > Am I missing something "base"? References (surely, I'd already read LW> > manpages for bpf, pcap and related -- but did I still missed something LW> > serious?) would be greatly appreciated. LW> LW> Yes, you're missing the interactive mode. LW> Refer to BIOCIMMEDIATE in the bpf(4) manual page.
Unfortunately not ;-)
Fortunately, yes.
if (ioctl(fd, BIOCPROMISC, NULL) == -1)
err(1, "can't set promisc mode");
if (ioctl(fd, BIOCIMMEDIATE, &yes) == -1)
err(1, "can't set IMMEDIATE mode");
Are you sure that "yes" variable holds the truth value?
-- Lev Walkin [EMAIL PROTECTED]
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