if ((rc = sendto(sock, fastopen->data, fastopen->len,
MSG_FASTOPEN | MSG_DONTWAIT, s_ptr, s_len)) >= 0)
/* seen for with-data, experimental TFO option, with-cookie case */
+ /* seen for with-data, proper TFO opt, with-cookie case */
{
DEBUG(D_transport|D_v) debug_printf("TFO mode connection attempt, %s data\n",
fastopen->len > 0 ? "with" : "no");
tcp_out_fastopen = fastopen->len > 0 ? 2 : 1;
}
- else if (errno == EINPROGRESS) /* expected for nonready peer */
+ else if (errno == EINPROGRESS) /* expected if we had no cookie for peer */
/* seen for no-data, proper TFO option, both cookie-request and with-cookie cases */
/* apparently no visibility of the diffference at this point */
+ /* seen for with-data, proper TFO opt, cookie-req */
/* with netwk delay, post-conn tcp_info sees unacked 1 for R, 2 for C; code in smtp_out.c */
/* ? older Experimental TFO option behaviour ? */
{ /* queue unsent data */
+ DEBUG(D_transport|D_v) debug_printf("TFO mode sendto, %s data: EINPROGRESS\n",
+ fastopen->len > 0 ? "with" : "no");
if (!fastopen->data)
{
- tcp_out_fastopen = 1; /* we tried; unknown if useful yet */
+ tcp_out_fastopen = 1; /* we tried; unknown if useful yet */
rc = 0;
}
- else if ( (rc = send(sock, fastopen->data, fastopen->len, 0)) < 0
- && errno == EINPROGRESS /* expected for nonready peer */
- )
- rc = 0;
+ else
+ rc = send(sock, fastopen->data, fastopen->len, 0);
}
else if(errno == EOPNOTSUPP)
{
1999-03-02 09:44:33 10HmaX-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local-esmtp S=sss
-1999-03-02 09:44:33 10HmaX-0005vi-00 => user_tfo@test.ex R=my_main_router T=my_smtp H=127.0.0.1 [127.0.0.1]:1224 PRX=[127.0.0.1]:1225 TFO C="250 accepted OK"
+1999-03-02 09:44:33 10HmaX-0005vi-00 => user_tfo@test.ex R=my_main_router T=my_smtp H=127.0.0.1 [127.0.0.1]:1224 PRX=[127.0.0.1]:1225 C="250 accepted OK"
1999-03-02 09:44:33 10HmaX-0005vi-00 Completed
1999-03-02 09:44:33 10HmaY-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local-esmtp S=sss
1999-03-02 09:44:33 10HmaY-0005vi-00 => user_tfo@test.ex R=my_main_router T=my_smtp H=127.0.0.1 [127.0.0.1]:1224 PRX=[127.0.0.1]:1225 TFO C="250 accepted OK"
1999-03-02 09:44:33 10HmaY-0005vi-00 Completed
+1999-03-02 09:44:33 10HmaZ-0005vi-00 <= CALLER@myhost.test.ex U=CALLER P=local-esmtp S=sss
+1999-03-02 09:44:33 10HmaZ-0005vi-00 => user_tfo@test.ex R=my_main_router T=my_smtp H=127.0.0.1 [127.0.0.1]:1224 PRX=[127.0.0.1]:1225 TFO C="250 accepted OK"
+1999-03-02 09:44:33 10HmaZ-0005vi-00 Completed
# A packet capture on the loopback interface will show the TFO
# 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 100ms'
+# 'sudo tc qdisc add dev lo root netem delay 50ms'
# 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'
#
+sudo perl
+system ("tc qdisc add dev lo root netem delay 50ms");
+****
+#
# 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 log => lint.ex should have a "TFO" element.
# Assuming this is the first run since boot, the a@test recipient will not.
#
+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.
#
-# this attempt to tidy up does not work
-#sudo perl
-#open (my $fh, "/proc/sys/net/ipv4/tcp_fastopen_key");
-#print $fh "00000000-00000000-00000000-00000000";
-#close $fh;
-#****
#
#
# FreeBSD: it looks like you have to compile a custom kernel, with
****
sleep 3
#
+#
+sudo perl
+system ("tc qdisc delete dev lo root");
+****
+#
killdaemon
no_msglog_check
munge loopback
#
#
+# TFO both clients and server, no cookie yet
+sudo perl
+system ("ip tcp_metrics delete 127.0.0.1");
+****
+#
+server -tfo PORT_D
+<<\x05\x01\x00
+>>\x05\x00
+<<\x05\x01\x00\x01\x7f\x00\x00\x01\x04\xc8
+>>\x05\x00\x00\x01\x7f\x00\x00\x01\xbe\xef
+220 Connected OK
+EHLO
+250-server id
+250
+MAIL FROM
+250
+RCPT TO
+250
+DATA
+354 go ahead
+.
+250 accepted OK
+QUIT
+250 bye
+****
+#
+#
+exim -odi -bs -DOPT=
+ehlo test.ex
+mail from:<>
+rcpt to:<user_tfo@test.ex>
+data
+Date: Fri, 17 Dec 2004 14:35:01 +0100
+Subject: message should be sent
+
+connection trying TFO via proxy; no cookie yet
+.
+quit
+****
+#
+#
+#
# TFO client, not server
server PORT_D
<<\x05\x01\x00
quit
****
#
+millisleep 500
#
# Ends
354 Enter message, ending with "." on a line by itself\r
250 OK id=10HmaY-0005vi-00\r
221 myhost.test.ex closing connection\r
+220 myhost.test.ex ESMTP Exim x.yz Tue, 2 Mar 1999 09:44:33 +0000\r
+250-myhost.test.ex Hello CALLER at test.ex\r
+250-SIZE 52428800\r
+250-8BITMIME\r
+250-PIPELINING\r
+250 HELP\r
+250 OK\r
+250 Accepted\r
+354 Enter message, ending with "." on a line by itself\r
+250 OK id=10HmaZ-0005vi-00\r
+221 myhost.test.ex closing connection\r
******** SERVER ********
Listening on port 1225 ...
RCPT TO
250
DATA
+354 go ahead
+R
+250 accepted OK
+QUIT
+250 bye
+End of script
+Listening on port 1225 ...
+Connection request from [ip4.ip4.ip4.ip4]
+<<\x05\x01\x00
+>>\x05\x00
+<<\x05\x01\x00\x01\x7f\x00\x00\x01\x04\xc8
+>>\x05\x00\x00\x01\x7f\x00\x00\x01\xbe\xef
+220 Connected OK
+EHLO
+250-server id
+250
+MAIL FROM
+250
+RCPT TO
+250
+DATA
354 do me
R
250 accepted OK
git://git.exim.org / exim.git / commitdiff