X-Git-Url: https://git.exim.org/users/heiko/exim.git/blobdiff_plain/8255135bf80545a31493a83348a4e8da901a4768..cdb844d019f4100eaceee36a521e9a4811a354f1:/test/scripts/1990-TCP-Fast-Open/1990 diff --git a/test/scripts/1990-TCP-Fast-Open/1990 b/test/scripts/1990-TCP-Fast-Open/1990 index 3fffce2d4..1fc4682aa 100644 --- a/test/scripts/1990-TCP-Fast-Open/1990 +++ b/test/scripts/1990-TCP-Fast-Open/1990 @@ -8,30 +8,46 @@ # option on the SYN, but the fast-output SMTP banner will not # be seen unless you also deliberately emulate a long path: # 'sudo tc qdisc add dev lo root netem delay 50ms' +# You'll need iproute-tc installed, for the tc command. # You'll need kernel-modules-extra installed, or you get # an unhelpful error from RTNETLINK. # To tidy up: 'sudo tc qdisc delete dev lo root' # +# MacOS: +# The kernel seems to have TFO enabled both ways as default. +# There is a net.inet.tcp.clear_tfocache parameter +## sysctl -w foo-val +# +# For network delays there is something called 'Network Link Conditioner' +# which might do the job. But how to manipulate it? +# +# sudo perl system ("tc qdisc add dev lo root netem delay 50ms"); **** # +# +# Disable the TFO blackhole detection, as we seem to be running foul of it. +# If bitten, we see the expected EINPROGRESS for sendto, yet no TFO cookie +# option on the SYN. +# +sudo perl +system ("[ -e /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec ] && echo 0 > /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec"); +**** +# # First time runs will see a TFO request option only; subsequent # ones should see the TFO cookie and fast-output SMTP banner # (currently on a separate packet after the server SYN,ACK but before # the client ACK). # -# The client log => lint.ex should have a "TFO" element. -# Assuming this is the first run since boot, the a@test recipient will not. +# The client log => line should have a "TFO" element. +# The server log <= line for a@test.ex should not. # +# First clear any previously-obtained cookie: sudo perl system ("ip tcp_metrics delete 127.0.0.1"); **** # -# The server log <= line for b@test.ex should have a "TFO" element, but -# this will only be obtained when the above delay is inserted into the -# loopback net path. -# # # # FreeBSD: it looks like you have to compile a custom kernel, with @@ -47,6 +63,10 @@ Testing **** sleep 3 # +# The server log <= line for b@test.ex should have a "TFO" element, but +# this will only be obtained when the above delay is inserted into the +# loopback net path. +# exim b@test.ex Testing **** @@ -55,6 +75,7 @@ sleep 3 # sudo perl system ("tc qdisc delete dev lo root"); +system ("[ -e /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec ] && echo 3600 > /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec"); **** # killdaemon