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