found the problem, not related to select() but
HAVE_BROKEN_RECVDSTADDR, which is still needed with OpenBSD 4.0 but
requires a small patch to compile properly.
In addition, some packets made it out of recvfrom_flags() with
sa_family not properly set in pktp (second last argument of that
function). I most likely fixed this in the wrong place by pre-setting
sa_family in pktp when zero'd for OpenBSD, but it looks like a safe
place:
Index: mDNSUNP.c
===================================================================
--- mDNSUNP.c (revision 19)
+++ mDNSUNP.c (working copy)
@@ -600,7 +600,16 @@
set the value to 0, but I'm concerned that 0
might be a valid interface value.
*/
+
+#if HAVE_BROKEN_RECVDSTADDR
+ /* similar to the issue with OpenBSD in mDNSPosix.c, we need
+ to preset sin_family to IF_NET, because of broken
IP_RECVDSTADDR
+ */
+ struct in_pktinfo *tmp;
+ struct sockaddr_in *sin = (struct sockaddr_in*)&pktp->ipi_addr;
memset(pktp, 0, sizeof(struct my_in_pktinfo));
+ sin->sin_family = AF_INET;
+#endif
pktp->ipi_ifindex = -1;
}
/* end recvfrom_flags1 */
Index: mDNSPosix.c
===================================================================
--- mDNSPosix.c (revision 19)
+++ mDNSPosix.c (working copy)
@@ -514,7 +514,7 @@
// so all we can do is just assume it's a multicast
#if HAVE_BROKEN_RECVDSTADDR || (!defined(IP_PKTINFO)
&& !defined(IP_RECVDSTADDR))
- if ( (destAddr.NotAnInteger == 0) && (flags &
MSG_MCAST) )
+ if ( (destAddr.ip.v4.NotAnInteger == 0) &&
(flags & MSG_MCAST) )
{
destAddr.type = senderAddr.type;
if (senderAddr.type ==
mDNSAddrType_IPv4) destAddr.ip.v4 = AllDNSLinkGroupv4;
On Jan 14, 2007, at 7:00 PM, Marcel Wiget wrote:
Hi,
I'm writing a multi-threaded networking application using
mDNSResponder-107.6 on OpenBSD 4.0 and have some intermittent
problem with some service announcements not been reported (e.g.
when using dns-sd -B). Same application works fine on OS/X Tiger
and FreeBSD 4.1. It might be related to a problem with OpenBSD, as
discovered with pcap (pcap_loop blocking threads) and related select
(), see below.
I tested this on OpenBSD 3.8 and 4.0. Both OS have the same problem.
I did apply the patch recently shown on this mailing list about
getting old/stale records delivered. That fix helped me with that
problem.
Is this by any chance a known issue and is there a fix, ev in the
CVS tree?
"Note that in some systems with BPF (older versions of
{Free,Net,Open,Dragonfly}BSD, current versions of Mac OS X), select
() (and poll()) don't work correctly on BPF devices, and so you
have to work around that. (Note also that poll() doesn't work on
*ANY* character special file, including BPF devices but also
including ttys/ ptys, in OS X 10.4[.x], i.e. Tiger.)"
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