110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
/*
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* Copyright (c) 2014-2015 Dmitry V. Levin <ldv@altlinux.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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int main(int ac, const char **av)
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{
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int i;
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int data = 0;
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struct iovec iov = {
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.iov_base = &data,
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.iov_len = sizeof(iov)
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};
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while ((i = open("/dev/null", O_RDWR)) < 3)
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assert(i >= 0);
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(void) close(3);
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int sv[2];
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assert(socketpair(AF_UNIX, SOCK_STREAM, 0, sv) == 0);
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int one = 1;
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assert(setsockopt(sv[0], SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) == 0);
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pid_t pid = fork();
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assert(pid >= 0);
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if (pid) {
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assert(close(sv[0]) == 0);
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assert(dup2(sv[1], 1) == 1);
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assert(close(sv[1]) == 0);
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int fds[ac];
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assert((fds[0] = open("/dev/null", O_RDWR)) == 3);
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for (i = 1; i < ac; ++i)
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assert((fds[i] = open(av[i], O_RDONLY)) == i + 3);
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union {
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struct cmsghdr cmsg;
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char buf[CMSG_LEN(sizeof(fds))];
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} control;
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control.cmsg.cmsg_level = SOL_SOCKET;
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control.cmsg.cmsg_type = SCM_RIGHTS;
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control.cmsg.cmsg_len = CMSG_LEN(sizeof(fds));
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memcpy(CMSG_DATA(&control.cmsg), fds, sizeof(fds));
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struct msghdr mh = {
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = &control,
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.msg_controllen = sizeof(control)
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};
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assert(sendmsg(1, &mh, 0) == sizeof(iov));
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assert(close(1) == 0);
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int status;
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assert(waitpid(pid, &status, 0) == pid);
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assert(status == 0);
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} else {
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assert(close(sv[1]) == 0);
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assert(dup2(sv[0], 0) == 0);
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assert(close(sv[0]) == 0);
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struct cmsghdr control[4 + ac * sizeof(int) / sizeof(struct cmsghdr)];
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struct msghdr mh = {
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.msg_iov = &iov,
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.msg_iovlen = 1,
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.msg_control = control,
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.msg_controllen = sizeof(control)
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};
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assert(recvmsg(0, &mh, 0) == sizeof(iov));
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assert(close(0) == 0);
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}
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return 0;
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}
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