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112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/*-
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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 <sys/un.h>
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#include <assert.h>
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#include <errno.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <atf-c.h>
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/*
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* shutdown(2) on SOCK_DGRAM shall return ENOTCONN per POSIX. However, there
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* is historical behavior of the shutdown(2) also unblocking any ongoing
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* recv(2) syscall on the socket. It is known that some programs rely on this
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* behavior, but exact list of programs isn't known. Neither we know if the
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* "feature" is required on PF_UNIX sockets or on PF_INET/INET6 sockets or
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* on both kinds. Feel free to improve this comment if you know any details.
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*
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* List of relevant commits, bug reports and reviews:
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* 63649db04205
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* https://reviews.freebsd.org/D10351
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* b114aa79596c (regresses)
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* https://reviews.freebsd.org/D3039 (regresses)
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* kern/84761 c5cff17017f9 aada5cccd878
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*/
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static void *
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blocking_thread(void *arg)
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{
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int *s = arg;
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char buf[1];
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int error, rv;
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rv = recv(*s, buf, sizeof(buf), 0);
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error = (rv == -1) ? errno : 0;
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return ((void *)(uintptr_t)error);
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}
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static void
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shutdown_thread(int s)
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{
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pthread_t t;
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int rv;
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ATF_REQUIRE(pthread_create(&t, NULL, blocking_thread, &s) == 0);
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usleep(1000);
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ATF_REQUIRE(shutdown(s, SHUT_RD) == -1);
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ATF_REQUIRE(errno == ENOTCONN);
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ATF_REQUIRE(pthread_join(t, (void *)&rv) == 0);
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ATF_REQUIRE(rv == 0);
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close(s);
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}
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ATF_TC_WITHOUT_HEAD(unblock);
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ATF_TC_BODY(unblock, tc)
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{
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static const struct sockaddr_un sun = {
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.sun_family = AF_LOCAL,
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.sun_len = sizeof(sun),
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.sun_path = "shutdown-dgram-test-sock",
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};
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int s;
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ATF_REQUIRE((s = socket(PF_UNIX, SOCK_DGRAM, 0)) >= 0);
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ATF_REQUIRE(bind(s, (struct sockaddr *)&sun, sizeof(sun)) == 0);
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shutdown_thread(s);
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static const 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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ATF_REQUIRE((s = socket(PF_INET, SOCK_DGRAM, 0)) >= 0);
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ATF_REQUIRE(bind(s, (struct sockaddr *)&sin, sizeof(sin)) == 0);
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shutdown_thread(s);
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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, unblock);
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return (atf_no_error());
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}
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