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tests/netinet: add a demo of TCP implied connect
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.
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@ -11,6 +11,7 @@ ATF_TESTS_C= ip_reass_test \
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so_reuseport_lb_test \
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socket_afinet \
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tcp_connect_port_test \
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tcp_implied_connect \
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tcp_md5_getsockopt
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ATF_TESTS_SH= arp \
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81
tests/sys/netinet/tcp_implied_connect.c
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81
tests/sys/netinet/tcp_implied_connect.c
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@ -0,0 +1,81 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2024 Gleb Smirnoff <glebius@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <atf-c.h>
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static struct sockaddr_in sin = {
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.sin_family = AF_INET,
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.sin_len = sizeof(sin),
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};
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static const char buf[] = "hello";
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static char repl[sizeof(buf)];
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ATF_TC_WITHOUT_HEAD(tcp_implied_connect);
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ATF_TC_BODY(tcp_implied_connect, tc)
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{
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socklen_t len;
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int s, c, a;
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ATF_REQUIRE(s = socket(PF_INET, SOCK_STREAM, 0));
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ATF_REQUIRE(c = socket(PF_INET, SOCK_STREAM, 0));
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ATF_REQUIRE(bind(s, (struct sockaddr *)&sin, sizeof(sin)) == 0);
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len = sizeof(sin);
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ATF_REQUIRE(getsockname(s, (struct sockaddr *)&sin, &len) == 0);
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ATF_REQUIRE(listen(s, -1) == 0);
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#if 0
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/*
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* The disabled code is that you would normally do.
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*/
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ATF_REQUIRE(connect(c, (struct sockaddr *)&sin, sizeof(sin)) == 0);
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ATF_REQUIRE(send(c, &buf, sizeof(buf), 0) == sizeof(buf));
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#else
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/*
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* And this is implied connect.
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*/
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ATF_REQUIRE(sendto(c, &buf, sizeof(buf), 0, (struct sockaddr *)&sin,
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sizeof(sin)) == sizeof(buf));
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#endif
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ATF_REQUIRE((a = accept(s, NULL, NULL)) != 1);
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ATF_REQUIRE(recv(a, &repl, sizeof(repl), 0) == sizeof(buf));
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ATF_REQUIRE(strcmp(buf, repl) == 0);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, tcp_implied_connect);
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return (atf_no_error());
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}
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