/*
 * Copyright (c) International Business Machines  Corp., 2001
 *  07/2001 Ported by Wayne Boyer
 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
 *
 * 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
 */

/*
 * Test Name: chown04
 *
 * Test Description:
 *   Verify that,
 *   1) chown(2) returns -1 and sets errno to EPERM if the effective user id
 *		 of process does not match the owner of the file and the process
 *		 is not super user.
 *   2) chown(2) returns -1 and sets errno to EACCES if search permission is
 *		 denied on a component of the path prefix.
 *   3) chown(2) returns -1 and sets errno to EFAULT if pathname points
 *		 outside user's accessible address space.
 *   4) chown(2) returns -1 and sets errno to ENAMETOOLONG if the pathname
 *		 component is too long.
 *   5) chown(2) returns -1 and sets errno to ENOTDIR if the directory
 *		 component in pathname is not a directory.
 *   6) chown(2) returns -1 and sets errno to ENOENT if the specified file
 *		 does not exists.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <grp.h>
#include <pwd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/mount.h>

#include "test.h"
#include "safe_macros.h"
#include "compat_16.h"

#define MODE_RWX		 (S_IRWXU|S_IRWXG|S_IRWXO)
#define FILE_MODE		 (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
#define DIR_MODE		 (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
				 S_IXGRP|S_IROTH|S_IXOTH)
#define DIR_TEMP		 "testdir_1"
#define TEST_FILE1		 "tfile_1"
#define TEST_FILE2		 (DIR_TEMP "/tfile_2")
#define TEST_FILE3		 "t_file/tfile_3"
#define TEST_FILE4		 "test_eloop1"
#define TEST_FILE5		 "mntpoint"

static char long_path[PATH_MAX + 2];
static const char *device;
static int mount_flag;

static struct test_case_t {
	char *pathname;
	int exp_errno;
} tc[] = {
	{TEST_FILE1, EPERM},
	{TEST_FILE2, EACCES},
	{(char *)-1, EFAULT},
	{long_path, ENAMETOOLONG},
	{"", ENOENT},
	{TEST_FILE3, ENOTDIR},
	{TEST_FILE4, ELOOP},
	{TEST_FILE5, EROFS}
};

TCID_DEFINE(chown04);
int TST_TOTAL = ARRAY_SIZE(tc);

static char *bad_addr;

static void setup(void);
static void cleanup(void);

int main(int ac, char **av)
{
	int lc;
	const char *msg;
	int i;
	uid_t user_id;
	gid_t group_id;

	msg = parse_opts(ac, av, NULL, NULL);
	if (msg != NULL)
		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);

	setup();

	UID16_CHECK((user_id = geteuid()), "chown", cleanup)
	GID16_CHECK((group_id = getegid()), "chown", cleanup)

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

		for (i = 0; i < TST_TOTAL; i++) {
			TEST(CHOWN(cleanup, tc[i].pathname, user_id, group_id));

			if (TEST_RETURN == 0) {
				tst_resm(TFAIL, "chown succeeded unexpectedly");
				continue;
			}

			if (TEST_ERRNO == tc[i].exp_errno) {
				tst_resm(TPASS | TTERRNO, "chown failed");
			} else {
				tst_resm(TFAIL | TTERRNO,
					 "chown failed; expected: %d - %s",
					 tc[i].exp_errno,
					 tst_strerrno(tc[i].exp_errno));
			}
		}
	}

	cleanup();
	tst_exit();
}

static void setup(void)
{
	struct passwd *ltpuser;
	const char *fs_type;

	tst_require_root(NULL);
	tst_sig(FORK, DEF_HANDLER, cleanup);
	ltpuser = SAFE_GETPWNAM(NULL, "nobody");

	tst_tmpdir();

	fs_type = tst_dev_fs_type();
	device = tst_acquire_device(cleanup);
	if (!device)
		tst_brkm(TCONF, cleanup, "Failed to obtain block device");

	tst_mkfs(cleanup, device, fs_type, NULL);

	TEST_PAUSE;

	memset(long_path, 'a', PATH_MAX - 1);

	bad_addr = mmap(0, 1, PROT_NONE,
			MAP_PRIVATE_EXCEPT_UCLINUX | MAP_ANONYMOUS, 0, 0);
	if (bad_addr == MAP_FAILED)
		tst_brkm(TBROK | TERRNO, cleanup, "mmap failed");

	tc[2].pathname = bad_addr;

	SAFE_SYMLINK(cleanup, "test_eloop1", "test_eloop2");
	SAFE_SYMLINK(cleanup, "test_eloop2", "test_eloop1");

	SAFE_SETEUID(cleanup, 0);
	SAFE_TOUCH(cleanup, "t_file", MODE_RWX, NULL);
	SAFE_TOUCH(cleanup, TEST_FILE1, 0666, NULL);
	SAFE_MKDIR(cleanup, DIR_TEMP, S_IRWXU);
	SAFE_TOUCH(cleanup, TEST_FILE2, 0666, NULL);

	SAFE_MKDIR(cleanup, "mntpoint", DIR_MODE);
	if (mount(device, "mntpoint", fs_type, MS_RDONLY, NULL) < 0) {
		tst_brkm(TBROK | TERRNO, cleanup,
			 "mount device:%s failed", device);
	}
	mount_flag = 1;

	SAFE_SETEUID(cleanup, ltpuser->pw_uid);
}

void cleanup(void)
{
	if (seteuid(0) == -1)
		tst_resm(TWARN | TERRNO, "seteuid(0) failed");

	if (mount_flag && tst_umount("mntpoint") < 0) {
		tst_brkm(TBROK | TERRNO, NULL,
			 "umount device:%s failed", device);
	}

	if (device)
		tst_release_device(NULL, device);

	tst_rmdir();
}