/*
 * Copyright (c) International Business Machines  Corp., 2006
 *  Author: Yi Yang <yyangcdl@cn.ibm.com>
 *
 * This program is free software;  you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY;  without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program;  if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
/*
 * Description:
 *   Verify that,
 *   1) renameat(2) returns -1 and sets errno to EBADF if olddirfd
 *      or newdirfd is not a valid file descriptor.
 *   2) renameat(2) returns -1 and sets errno to ENOTDIR if oldpath
 *      is relative and olddirfd is a file descriptor referring to
 *      a file other than a directory, or similar for newpath and
 *      newdirfd.
 *   3) renameat(2) returns -1 and sets errno to ELOOP if too many
 *      symbolic links were encountered in resolving oldpath or
 *      newpath.
 *   4) renameat(2) returns -1 and sets errno to EROFS if the file
 *      is on a read-only file system.
 *   5) renameat(2) returns -1 and sets errno to EMLINK if oldpath
 *      already has the maximum number of links to it, or it is a
 *      directory and the directory containing newpath has the
 *      maximum number of links.
 */

#define _GNU_SOURCE

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <sys/mount.h>

#include "test.h"
#include "safe_macros.h"
#include "lapi/fcntl.h"
#include "lapi/renameat.h"

#define MNTPOINT "mntpoint"
#define TESTDIR "testdir"
#define NEW_TESTDIR "new_testdir"
#define TESTDIR2 "/loopdir"
#define NEW_TESTDIR2 "newloopdir"
#define TESTDIR3 "emlinkdir"
#define NEW_TESTDIR3 "testemlinkdir/new_emlinkdir"
#define TESTFILE "testfile"
#define NEW_TESTFILE "new_testfile"
#define TESTFILE2 "testfile2"
#define NEW_TESTFILE2 "new_testfile2"
#define TESTFILE3 "testdir/testfile"
#define TESTFILE4 "testfile4"
#define TESTFILE5 "mntpoint/rofile"
#define NEW_TESTFILE5 "mntpoint/newrofile"

#define DIRMODE (S_IRWXU | S_IRWXG | S_IRWXO)
#define FILEMODE (S_IRWXU | S_IRWXG | S_IRWXO)

static int curfd = AT_FDCWD;
static int olddirfd;
static int newdirfd;
static int badfd = 100;
static int filefd;
static char absoldpath[256];
static char absnewpath[256];
static char looppathname[sizeof(TESTDIR2) * 43] = ".";
static int max_subdirs;

static int mount_flag;
static const char *device;

static struct test_case_t {
	int *oldfdptr;
	const char *oldpath;
	int *newfdptr;
	const char *newpath;
	int exp_errno;
} test_cases[] = {
	{ &curfd, TESTFILE, &curfd, NEW_TESTFILE, 0 },
	{ &olddirfd, TESTFILE, &newdirfd, NEW_TESTFILE, 0 },
	{ &olddirfd, absoldpath, &newdirfd, absnewpath, 0 },
	{ &badfd, TESTFILE, &badfd, NEW_TESTFILE, EBADF },
	{ &filefd, TESTFILE, &filefd, NEW_TESTFILE, ENOTDIR },
	{ &curfd, looppathname, &curfd, NEW_TESTDIR2, ELOOP },
	{ &curfd, TESTFILE5, &curfd, NEW_TESTFILE5, EROFS },
	{ &curfd, TESTDIR3, &curfd, NEW_TESTDIR3, EMLINK },
};

static void setup(void);
static void cleanup(void);
static void renameat_verify(const struct test_case_t *);

char *TCID = "renameat01";
int TST_TOTAL = ARRAY_SIZE(test_cases);

int main(int ac, char **av)
{
	int i, lc;

	tst_parse_opts(ac, av, NULL, NULL);

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		tst_count = 0;

		for (i = 0; i < TST_TOTAL; i++)
			renameat_verify(&test_cases[i]);
	}

	cleanup();
	tst_exit();
}

static void setup(void)
{
	char *tmpdir;
	const char *fs_type;
	int i;

	if ((tst_kvercmp(2, 6, 16)) < 0) {
		tst_brkm(TCONF, NULL,
			"This test can only run on kernels that are "
			"2.6.16 and higher");
	}

	tst_require_root();

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	tst_tmpdir();

	fs_type = tst_dev_fs_type();
	device = tst_acquire_device(cleanup);

	if (!device)
		tst_brkm(TCONF, cleanup, "Failed to obtain block device");

	TEST_PAUSE;

	SAFE_TOUCH(cleanup, TESTFILE, FILEMODE, NULL);

	SAFE_TOUCH(cleanup, TESTFILE2, FILEMODE, NULL);
	tmpdir = tst_get_tmpdir();
	sprintf(absoldpath, "%s/%s", tmpdir, TESTFILE2);
	sprintf(absnewpath, "%s/%s", tmpdir, NEW_TESTFILE2);
	free(tmpdir);

	SAFE_MKDIR(cleanup, TESTDIR, DIRMODE);
	SAFE_TOUCH(cleanup, TESTFILE3, FILEMODE, NULL);
	SAFE_MKDIR(cleanup, NEW_TESTDIR, DIRMODE);

	olddirfd = SAFE_OPEN(cleanup, TESTDIR, O_DIRECTORY);
	newdirfd = SAFE_OPEN(cleanup, NEW_TESTDIR, O_DIRECTORY);

	filefd = SAFE_OPEN(cleanup, TESTFILE4,
				O_RDWR | O_CREAT, FILEMODE);

	/*
	 * NOTE: the ELOOP test is written based on that the
	 * consecutive symlinks limit in kernel is hardwired
	 * to 40.
	 */
	SAFE_MKDIR(cleanup, "loopdir", DIRMODE);
	SAFE_SYMLINK(cleanup, "../loopdir", "loopdir/loopdir");
	for (i = 0; i < 43; i++)
		strcat(looppathname, TESTDIR2);

	tst_mkfs(cleanup, device, fs_type, NULL, NULL);
	SAFE_MKDIR(cleanup, MNTPOINT, DIRMODE);
	if (mount(device, MNTPOINT, fs_type, 0, NULL) < 0) {
		tst_brkm(TBROK | TERRNO, cleanup,
			"mount device:%s failed", device);
	}
	mount_flag = 1;
	SAFE_TOUCH(cleanup, TESTFILE5, FILEMODE, NULL);
	if (mount(device, MNTPOINT, fs_type,
			MS_REMOUNT | MS_RDONLY, NULL) < 0) {
		tst_brkm(TBROK | TERRNO, cleanup,
			"mount device:%s failed", device);
	}

	SAFE_MKDIR(cleanup, TESTDIR3, DIRMODE);
	max_subdirs = tst_fs_fill_subdirs(cleanup, "testemlinkdir");
}

static void renameat_verify(const struct test_case_t *tc)
{
	if (tc->exp_errno == EMLINK && max_subdirs == 0) {
		tst_resm(TCONF, "EMLINK test is not appropriate");
		return;
	}

	TEST(renameat(*(tc->oldfdptr), tc->oldpath,
			*(tc->newfdptr), tc->newpath));

	if (tc->exp_errno && TEST_RETURN != -1) {
		tst_resm(TFAIL, "renameat() succeeded unexpectedly");
		return;
	}

	if (tc->exp_errno == 0 && TEST_RETURN != 0) {
		tst_resm(TFAIL | TTERRNO, "renameat() failed unexpectedly");
		return;
	}

	if (TEST_ERRNO == tc->exp_errno) {
		tst_resm(TPASS | TTERRNO,
		"renameat() returned the expected value");
	} else {
		tst_resm(TFAIL | TTERRNO,
			"renameat() got unexpected return value; expected: "
			"%d - %s", tc->exp_errno,
			strerror(tc->exp_errno));
	}

	if (TEST_ERRNO == 0 && renameat(*(tc->newfdptr), tc->newpath,
		*(tc->oldfdptr), tc->oldpath) < 0) {
		tst_brkm(TBROK | TERRNO, cleanup, "renameat(%d, %s, "
			"%d, %s) failed.", *(tc->newfdptr), tc->newpath,
			*(tc->oldfdptr), tc->oldpath);
	}
}

static void cleanup(void)
{
	if (olddirfd > 0 && close(olddirfd) < 0)
		tst_resm(TWARN | TERRNO, "close olddirfd failed");

	if (newdirfd > 0 && close(newdirfd) < 0)
		tst_resm(TWARN | TERRNO, "close newdirfd failed");

	if (filefd > 0 && close(filefd) < 0)
		tst_resm(TWARN | TERRNO, "close filefd failed");

	if (mount_flag && tst_umount(MNTPOINT) < 0)
		tst_resm(TWARN | TERRNO, "umount %s failed", MNTPOINT);

	if (device)
		tst_release_device(device);

	tst_rmdir();
}