1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*-
* Copyright (c) 2004-2005 Robert N. M. Watson
* All rights reserved.
*
* 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
/*
* The listenclose regression test is designed to catch kernel bugs that may
* trigger as a result of performing a close on a listen() socket with as-yet
* unaccepted connections in its queues. This results in the connections
* being aborted, which is a not-often-followed code path. To do this, we
* create a local TCP socket, build a non-blocking connection to it, and then
* close the accept socket. The connection must be non-blocking or the
* program will block and as such connect() will not return as accept() is
* never called.
*/
int
main(void)
{
int listen_sock, connect_sock;
struct sockaddr_in sin;
socklen_t len;
u_short port;
int arg;
listen_sock = socket(PF_INET, SOCK_STREAM, 0);
if (listen_sock == -1)
errx(-1,
"socket(PF_INET, SOCK_STREAM, 0) for listen socket: %s",
strerror(errno));
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_port = 0;
if (bind(listen_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
errx(-1, "bind(%s, %d) for listen socket: %s",
inet_ntoa(sin.sin_addr), 0, strerror(errno));
len = sizeof(sin);
if (getsockname(listen_sock, (struct sockaddr *)&sin, &len) < 0)
errx(-1, "getsockname() for listen socket: %s",
strerror(errno));
port = sin.sin_port;
if (listen(listen_sock, -1) < 0)
errx(-1, "listen() for listen socket: %s", strerror(errno));
connect_sock = socket(PF_INET, SOCK_STREAM, 0);
if (connect_sock == -1)
errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect "
"socket: %s", strerror(errno));
arg = O_NONBLOCK;
if (fcntl(connect_sock, F_SETFL, &arg) < 0)
errx(-1, "socket(PF_INET, SOCK_STREAM, 0) for connect socket"
": %s", strerror(errno));
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_port = port;
if (connect(connect_sock, (struct sockaddr *)&sin, sizeof(sin)) < 0)
errx(-1, "connect() for connect socket: %s", strerror(errno));
close(connect_sock);
close(listen_sock);
return (0);
}
|
