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1 /*
2  * Copyright (c) 2013-2015 Dmitry V. Levin <ldv@altlinux.org>
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  * 3. The name of the author may not be used to endorse or promote products
14  *    derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #include <assert.h>
29 #include <stddef.h>
30 #include <string.h>
31 #include <signal.h>
32 #include <unistd.h>
33 #include <sys/wait.h>
34 #include <sys/socket.h>
35 #include <sys/un.h>
36 
37 static void
handler(int sig)38 handler(int sig)
39 {
40 	assert(close(1) == 0);
41 	_exit(0);
42 }
43 
44 int
main(int ac,const char ** av)45 main(int ac, const char **av)
46 {
47 	struct sockaddr_un addr = {
48 		.sun_family = AF_UNIX,
49 	};
50 	socklen_t len;
51 
52 	assert(ac == 2);
53 	assert(strlen(av[1]) > 0);
54 
55 	strncpy(addr.sun_path, av[1], sizeof(addr.sun_path));
56 	len = offsetof(struct sockaddr_un, sun_path) + strlen(av[1]) + 1;
57 	if (len > sizeof(addr))
58 		len = sizeof(addr);
59 
60 	unlink(av[1]);
61 	close(0);
62 	close(1);
63 
64 	assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 0);
65 	assert(bind(0, (struct sockaddr *) &addr, len) == 0);
66 	assert(listen(0, 5) == 0);
67 
68 	memset(&addr, 0, sizeof addr);
69 	assert(getsockname(0, (struct sockaddr *) &addr, &len) == 0);
70 	if (len > sizeof(addr))
71 		len = sizeof(addr);
72 
73 	pid_t pid = fork();
74 	assert(pid >= 0);
75 
76 	if (pid) {
77 		assert(accept(0, (struct sockaddr *) &addr, &len) == 1);
78 		assert(close(0) == 0);
79 		assert(kill(pid, SIGUSR1) == 0);
80 		int status;
81 		assert(waitpid(pid, &status, 0) == pid);
82 		assert(status == 0);
83 		assert(close(1) == 0);
84 	} else {
85 		sigset_t set;
86 		sigemptyset(&set);
87 		sigaddset(&set, SIGUSR1);
88 
89 		assert(sigprocmask(SIG_BLOCK, &set, NULL) == 0);
90 		assert(signal(SIGUSR1, handler) != SIG_ERR);
91 		assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 1);
92 		assert(close(0) == 0);
93 		assert(connect(1, (struct sockaddr *) &addr, len) == 0);
94 		assert(sigprocmask(SIG_UNBLOCK, &set, NULL) == 0);
95 		assert(pause() == 99);
96 		return 1;
97 	}
98 
99 	unlink(av[1]);
100 	return 0;
101 }
102