1/*-
2 * Copyright (c) 2004-2005 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/types.h>
28#include <sys/socket.h>
29
30#include <netinet/in.h>
31
32#include <arpa/inet.h>
33
34#include <err.h>
35#include <errno.h>
36#include <fcntl.h>
37#include <stdio.h>
38#include <string.h>
39#include <unistd.h>
40
41/*
42 * The listenclose regression test is designed to catch kernel bugs that may
43 * trigger as a result of performing a close on a listen() socket with as-yet
44 * unaccepted connections in its queues.  This results in the connections
45 * being aborted, which is a not-often-followed code path.  To do this, we
46 * create a local TCP socket, build a non-blocking connection to it, and then
47 * close the accept socket.  The connection must be non-blocking or the
48 * program will block and as such connect() will not return as accept() is
49 * never called.
50 */
51
52int
53main(void)
54{
55	int listen_sock, connect_sock;
56	struct sockaddr_in sin;
57	socklen_t len;
58	u_short port;
59	int arg;
60
61	listen_sock = socket(PF_INET, SOCK_STREAM, 0);
62	if (listen_sock == -1)
63		errx(-1,
64		    "socket(PF_INET, SOCK_STREAM, 0) for listen socket: %s",
65		    strerror(errno));
66
67
68	bzero(&sin, sizeof(sin));
69	sin.sin_len = sizeof(sin);
70	sin.sin_family = AF_INET;
71	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
72	sin.sin_port = 0;
73
74	if (bind(listen_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
75		errx(-1, "bind(%s, %d) for listen socket: %s",
76		    inet_ntoa(sin.sin_addr), 0, strerror(errno));
77
78	len = sizeof(sin);
79	if (getsockname(listen_sock, (struct sockaddr *)&sin, &len) < 0)
80		errx(-1, "getsockname() for listen socket: %s",
81		    strerror(errno));
82	port = sin.sin_port;
83
84	if (listen(listen_sock, -1) < 0)
85		errx(-1, "listen() for listen socket: %s", strerror(errno));
86
87	connect_sock = socket(PF_INET, SOCK_STREAM, 0);
88	if (connect_sock == -1)
89		errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect "
90		    "socket: %s", strerror(errno));
91
92	arg = O_NONBLOCK;
93	if (fcntl(connect_sock, F_SETFL, &arg) < 0)
94		errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect socket"
95		    ": %s", strerror(errno));
96
97	bzero(&sin, sizeof(sin));
98	sin.sin_len = sizeof(sin);
99	sin.sin_family = AF_INET;
100	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
101	sin.sin_port = port;
102
103	if (connect(connect_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
104		errx(-1, "connect() for connect socket: %s", strerror(errno));
105	close(connect_sock);
106	close(listen_sock);
107
108	return (0);
109}
110