reconnect.c revision 294486 
1/*-
2 * Copyright (c) 2005 Maxim Sobolev
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 * $FreeBSD: stable/10/tools/regression/sockets/reconnect/reconnect.c 294486 2016-01-21 05:59:33Z ngie $
27 */
28
29/*
30 * The reconnect regression test is designed to catch kernel bug that may
31 * prevent changing association of already associated datagram unix domain
32 * socket when server side of connection has been closed.
33 */
34
35#include <sys/types.h>
36#include <sys/socket.h>
37#include <sys/uio.h>
38#include <sys/un.h>
39#include <err.h>
40#include <errno.h>
41#include <fcntl.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <signal.h>
45#include <string.h>
46#include <unistd.h>
47
48static char uds_name1[] = "reconnect.XXXXXXXX";
49static char uds_name2[] = "reconnect.XXXXXXXX";
50
51#define	sstosa(ss)	((struct sockaddr *)(ss))
52
53static void
54prepare_ifsun(struct sockaddr_un *ifsun, const char *path)
55{
56
57    memset(ifsun, '\0', sizeof(*ifsun));
58#if !defined(__linux__) && !defined(__solaris__)
59    ifsun->sun_len = strlen(path);
60#endif
61    ifsun->sun_family = AF_LOCAL;
62    strcpy(ifsun->sun_path, path);
63}
64
65static int
66create_uds_server(const char *path)
67{
68    struct sockaddr_un ifsun;
69    int sock;
70
71    prepare_ifsun(&ifsun, path);
72
73    unlink(ifsun.sun_path);
74
75    sock = socket(PF_LOCAL, SOCK_DGRAM, 0);
76    if (sock == -1)
77        err(1, "can't create socket");
78    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &sock, sizeof(sock));
79    if (bind(sock, sstosa(&ifsun), sizeof(ifsun)) < 0)
80        err(1, "can't bind to a socket");
81
82    return sock;
83}
84
85static void
86connect_uds_server(int sock, const char *path)
87{
88    struct sockaddr_un ifsun;
89    int e;
90
91    prepare_ifsun(&ifsun, path);
92
93    e = connect(sock, sstosa(&ifsun), sizeof(ifsun));
94    if (e < 0)
95        err(1, "can't connect to a socket");
96}
97
98static void
99cleanup(void)
100{
101
102    unlink(uds_name1);
103    unlink(uds_name2);
104}
105
106int
107main(void)
108{
109    int s_sock1, s_sock2, c_sock;
110
111    atexit(cleanup);
112
113    if (mkstemp(uds_name1) == -1)
114	err(1, "mkstemp");
115    unlink(uds_name1);
116    s_sock1 = create_uds_server(uds_name1);
117
118    if (mkstemp(uds_name2) == -1)
119        err(1, "mkstemp");
120    unlink(uds_name2);
121    s_sock2 = create_uds_server(uds_name2);
122
123    c_sock = socket(PF_LOCAL, SOCK_DGRAM, 0);
124    if (c_sock < 0)
125        err(1, "can't create socket");
126
127    connect_uds_server(c_sock, uds_name1);
128    close(s_sock1);
129    connect_uds_server(c_sock, uds_name2);
130    close(s_sock2);
131
132    exit (0);
133}
134