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
52 int
main(void)53 main(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