1 /*
2 * Copyright (c) 2014-2015 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 <string.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <errno.h>
33 #include <fcntl.h>
34 #include <sys/socket.h>
35 #include <sys/wait.h>
36
main(int ac,const char ** av)37 int main(int ac, const char **av)
38 {
39 int i;
40 int data = 0;
41 struct iovec iov = {
42 .iov_base = &data,
43 .iov_len = sizeof(iov)
44 };
45
46 while ((i = open("/dev/null", O_RDWR)) < 3)
47 assert(i >= 0);
48 (void) close(3);
49
50 int sv[2];
51 assert(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == 0);
52 int one = 1;
53 assert(setsockopt(sv[0], SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) == 0);
54
55 pid_t pid = fork();
56 assert(pid >= 0);
57
58 if (pid) {
59 assert(close(sv[0]) == 0);
60 assert(dup2(sv[1], 1) == 1);
61 assert(close(sv[1]) == 0);
62
63 int fds[ac];
64 assert((fds[0] = open("/dev/null", O_RDWR)) == 3);
65 for (i = 1; i < ac; ++i)
66 assert((fds[i] = open(av[i], O_RDONLY)) == i + 3);
67
68 union {
69 struct cmsghdr cmsg;
70 char buf[CMSG_LEN(sizeof(fds))];
71 } control;
72
73 control.cmsg.cmsg_level = SOL_SOCKET;
74 control.cmsg.cmsg_type = SCM_RIGHTS;
75 control.cmsg.cmsg_len = CMSG_LEN(sizeof(fds));
76 memcpy(CMSG_DATA(&control.cmsg), fds, sizeof(fds));
77
78 struct msghdr mh = {
79 .msg_iov = &iov,
80 .msg_iovlen = 1,
81 .msg_control = &control,
82 .msg_controllen = sizeof(control)
83 };
84
85 assert(sendmsg(1, &mh, 0) == sizeof(iov));
86 assert(close(1) == 0);
87
88 int status;
89 assert(waitpid(pid, &status, 0) == pid);
90 assert(status == 0);
91 } else {
92 assert(close(sv[1]) == 0);
93 assert(dup2(sv[0], 0) == 0);
94 assert(close(sv[0]) == 0);
95
96 struct cmsghdr control[4 + ac * sizeof(int) / sizeof(struct cmsghdr)];
97
98 struct msghdr mh = {
99 .msg_iov = &iov,
100 .msg_iovlen = 1,
101 .msg_control = control,
102 .msg_controllen = sizeof(control)
103 };
104
105 assert(recvmsg(0, &mh, 0) == sizeof(iov));
106 assert(close(0) == 0);
107 }
108
109 return 0;
110 }
111