git: 861274c9f8cf - main - tests/netinet: add a demo of TCP implied connect
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Date: Thu, 01 Feb 2024 21:44:46 UTC
The branch main has been updated by glebius: URL: https://cgit.FreeBSD.org/src/commit/?id=861274c9f8cf2a5c00ded9580ea91b22def683f7 commit 861274c9f8cf2a5c00ded9580ea91b22def683f7 Author: Gleb Smirnoff <glebius@FreeBSD.org> AuthorDate: 2024-02-01 21:37:26 +0000 Commit: Gleb Smirnoff <glebius@FreeBSD.org> CommitDate: 2024-02-01 21:43:36 +0000 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. --- tests/sys/netinet/Makefile | 1 + tests/sys/netinet/tcp_implied_connect.c | 81 +++++++++++++++++++++++++++++++++ 2 files changed, 82 insertions(+) diff --git a/tests/sys/netinet/Makefile b/tests/sys/netinet/Makefile index 434aadc87f46..b86457c2d723 100644 --- a/tests/sys/netinet/Makefile +++ b/tests/sys/netinet/Makefile @@ -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 \ diff --git a/tests/sys/netinet/tcp_implied_connect.c b/tests/sys/netinet/tcp_implied_connect.c new file mode 100644 index 000000000000..2961626d5e5b --- /dev/null +++ b/tests/sys/netinet/tcp_implied_connect.c @@ -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()); +}