1 #include <assert.h>
2 #include <string.h>
3 #include <stdlib.h>
4 #include <unistd.h>
5 #include <errno.h>
6 #include <fcntl.h>
7 #include <sys/socket.h>
8 #include <sys/wait.h>
9
main(int ac,const char ** av)10 int main(int ac, const char **av)
11 {
12 int i;
13 int data = 0;
14 struct iovec iov = {
15 .iov_base = &data,
16 .iov_len = sizeof(iov)
17 };
18
19 while ((i = open("/dev/null", O_RDWR)) < 3)
20 assert(i >= 0);
21 (void) close(3);
22
23 int sv[2];
24 assert(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == 0);
25 int one = 1;
26 assert(setsockopt(sv[0], SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) == 0);
27
28 pid_t pid = fork();
29 assert(pid >= 0);
30
31 if (pid) {
32 assert(close(sv[0]) == 0);
33 assert(dup2(sv[1], 1) == 1);
34 assert(close(sv[1]) == 0);
35
36 int fds[ac];
37 assert((fds[0] = open("/dev/null", O_RDWR)) == 3);
38 for (i = 1; i < ac; ++i)
39 assert((fds[i] = open(av[i], O_RDONLY)) == i + 3);
40
41 union {
42 struct cmsghdr cmsg;
43 char buf[CMSG_LEN(sizeof(fds))];
44 } control;
45
46 control.cmsg.cmsg_level = SOL_SOCKET;
47 control.cmsg.cmsg_type = SCM_RIGHTS;
48 control.cmsg.cmsg_len = CMSG_LEN(sizeof(fds));
49 memcpy(CMSG_DATA(&control.cmsg), fds, sizeof(fds));
50
51 struct msghdr mh = {
52 .msg_iov = &iov,
53 .msg_iovlen = 1,
54 .msg_control = &control,
55 .msg_controllen = sizeof(control)
56 };
57
58 assert(sendmsg(1, &mh, 0) == sizeof(iov));
59 assert(close(1) == 0);
60
61 int status;
62 assert(waitpid(pid, &status, 0) == pid);
63 assert(status == 0);
64 } else {
65 assert(close(sv[1]) == 0);
66 assert(dup2(sv[0], 0) == 0);
67 assert(close(sv[0]) == 0);
68
69 struct cmsghdr control[4 + ac * sizeof(int) / sizeof(struct cmsghdr)];
70
71 struct msghdr mh = {
72 .msg_iov = &iov,
73 .msg_iovlen = 1,
74 .msg_control = control,
75 .msg_controllen = sizeof(control)
76 };
77
78 assert(recvmsg(0, &mh, 0) == sizeof(iov));
79 assert(close(0) == 0);
80 }
81
82 return 0;
83 }
84