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tests/netinet: add a demo of TCP implied connect

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The TCP implied connect is an artifact left after T/TCP.  To my surprise
it still works, hence the existence of this test.  Please read this email
first:

https://lists.freebsd.org/pipermail/freebsd-net/2010-August/026311.html

An interesting fact that this test takes 220 - 240 milliseconds to
execute on my Threadripper PRO.  Flipping the '#if 0' to '#if 1' in the
test, thus bringing it back to normal connect(2), would speed the test up
a hundred times and I guess all this time is fork+exec of the test.
This commit is contained in:
Gleb Smirnoff 2024-02-01 13:37:26 -08:00
parent 702c481847
commit 861274c9f8
2 changed files with 82 additions and 0 deletions
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1
tests/sys/netinet/Makefile
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@ -11,6 +11,7 @@ ATF_TESTS_C= ip_reass_test \
so_reuseport_lb_test \
socket_afinet \
tcp_connect_port_test \
tcp_implied_connect \
tcp_md5_getsockopt
ATF_TESTS_SH= arp \

81
tests/sys/netinet/tcp_implied_connect.c Normal file
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@ -0,0 +1,81 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024 Gleb Smirnoff <glebius@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <atf-c.h>
static struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_len = sizeof(sin),
};
static const char buf[] = "hello";
static char repl[sizeof(buf)];
ATF_TC_WITHOUT_HEAD(tcp_implied_connect);
ATF_TC_BODY(tcp_implied_connect, tc)
{
socklen_t len;
int s, c, a;
ATF_REQUIRE(s = socket(PF_INET, SOCK_STREAM, 0));
ATF_REQUIRE(c = socket(PF_INET, SOCK_STREAM, 0));
ATF_REQUIRE(bind(s, (struct sockaddr *)&sin, sizeof(sin)) == 0);
len = sizeof(sin);
ATF_REQUIRE(getsockname(s, (struct sockaddr *)&sin, &len) == 0);
ATF_REQUIRE(listen(s, -1) == 0);
#if 0
/*
* The disabled code is that you would normally do.
*/
ATF_REQUIRE(connect(c, (struct sockaddr *)&sin, sizeof(sin)) == 0);
ATF_REQUIRE(send(c, &buf, sizeof(buf), 0) == sizeof(buf));
#else
/*
* And this is implied connect.
*/
ATF_REQUIRE(sendto(c, &buf, sizeof(buf), 0, (struct sockaddr *)&sin,
sizeof(sin)) == sizeof(buf));
#endif
ATF_REQUIRE((a = accept(s, NULL, NULL)) != 1);
ATF_REQUIRE(recv(a, &repl, sizeof(repl), 0) == sizeof(buf));
ATF_REQUIRE(strcmp(buf, repl) == 0);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, tcp_implied_connect);
return (atf_no_error());
}