Jan Engelhardt wrote:
On Monday 2009-09-14 14:20, Amos Jeffries wrote:
assert(socket(PF_INET6, ...) >= 0);
assert(setsockopt(fd, SOL_IP, IP_TRANSPARENT, ...) == 0);
assert(bind(fd, {::2}) == 0);
At least something like that I remember to have used to determine
tproxy-2.x ipv4 availability in the days. (I.e. seeing if setsockopt
failed.)
Thanks Jan. I gave a variant that a try. It does seem to detect the feature
support nicely.
However, trying to bind the real IP:port soon after results in "(98) Address
already in use" even with a shutdown(tmp_sock,...) added to clean up after the
test.
Odd, since binding to port 0 should give you a random one,
and there are plenty.
Does SO_REUSEADDR help it a bit?
um... thanks for the hint.
I was re-using a handy address object without un-setting the port.
It works fully now.
AYJ
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