/*
 * Copyright (c) 2021 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * test-unix-socket-fd-leak.c
 * Tests whether leaking file descriptors over a Unix socket works.
 */

#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/wait.h>

#include <stdalign.h>
#include <stdio.h>
#include <unistd.h>

#include "test.h"

int main(void)
{
	int fds[2];
	test_assert(socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == 0);

	FILE* file;
	test_assert((file = tmpfile()));

	struct msghdr mhdr;
	char buf[1] = { 0 };
	struct iovec iov;
	iov.iov_base = buf;
	iov.iov_len = sizeof(buf);
	alignas(struct cmsghdr) char cmsgdata[CMSG_SPACE(sizeof(int))];

	buf[0] = 'X';
	memset(&mhdr, 0, sizeof(mhdr));
	mhdr.msg_iov = &iov;
	mhdr.msg_iovlen = 1;
	mhdr.msg_control = cmsgdata;
	mhdr.msg_controllen = sizeof(cmsgdata);
	struct cmsghdr* cmsg = CMSG_FIRSTHDR(&mhdr);
	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
	cmsg->cmsg_level = SOL_SOCKET;
	cmsg->cmsg_type = SCM_RIGHTS;
	int* cdata = (int*) CMSG_DATA(cmsg);
	*cdata = fileno(file);
	ssize_t amount = sendmsg(fds[1], &mhdr, 0);
	test_assert(0 <= amount);
	test_assertx(amount == 1);

	fclose(file);
	close(fds[0]);
	close(fds[1]);

	return 0;
}