1/*
2 * Copyright (c) 2014 Fujitsu Ltd.
3 * Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program.
15 */
16/*
17 * Test that linkat() fails and sets the proper errno values.
18 */
19
20#define _GNU_SOURCE
21
22#include <sys/types.h>
23#include <sys/stat.h>
24#include <unistd.h>
25#include <stdlib.h>
26#include <errno.h>
27#include <string.h>
28#include <signal.h>
29#include <pwd.h>
30#include <sys/mount.h>
31
32#include "test.h"
33#include "lapi/syscalls.h"
34#include "safe_macros.h"
35#include "lapi/fcntl.h"
36
37#define DIR_MODE	(S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
38			 S_IXGRP|S_IROTH|S_IXOTH)
39#define TEST_FILE	"testfile"
40#define TEST_EXIST	"testexist"
41#define TEST_ELOOP	"testeloop"
42#define TEST_EACCES	"./tmp/testeeacces"
43#define TEST_EACCES2	"./tmp/testeeacces2"
44#define TEST_EROFS	"mntpoint"
45#define TEST_EROFS2	"mntpoint/testerofs2"
46#define TEST_EMLINK	"emlink_dir/testfile0"
47#define TEST_EMLINK2	"emlink_dir/testfile"
48#define BASENAME	"mntpoint/basename"
49
50static char nametoolong[PATH_MAX+2];
51static const char *device;
52static int mount_flag;
53static int max_hardlinks;
54static const char *fs_type;
55
56static void setup(void);
57static void cleanup(void);
58static void setup_eacces(void);
59static void cleanup_eacces(void);
60static void setup_erofs(void);
61
62static struct test_struct {
63	const char *oldfname;
64	const char *newfname;
65	int flags;
66	int expected_errno;
67	void (*setupfunc) (void);
68	void (*cleanfunc) (void);
69} test_cases[] = {
70	{TEST_FILE, nametoolong, 0, ENAMETOOLONG, NULL, NULL},
71	{nametoolong, TEST_FILE, 0, ENAMETOOLONG, NULL, NULL},
72	{TEST_EXIST, TEST_EXIST, 0, EEXIST, NULL, NULL},
73	{TEST_ELOOP, TEST_FILE, AT_SYMLINK_FOLLOW, ELOOP, NULL, NULL},
74	{TEST_EACCES, TEST_EACCES2, 0, EACCES, setup_eacces, cleanup_eacces},
75	{TEST_EROFS, TEST_EROFS2, 0, EROFS, setup_erofs, NULL},
76	{TEST_EMLINK, TEST_EMLINK2, 0, EMLINK, NULL, NULL},
77};
78
79char *TCID = "linkat02";
80int TST_TOTAL = ARRAY_SIZE(test_cases);
81
82static struct passwd *ltpuser;
83static void linkat_verify(const struct test_struct *);
84
85int main(int ac, char **av)
86{
87	int lc;
88	int i;
89
90	tst_parse_opts(ac, av, NULL, NULL);
91
92	setup();
93
94	for (lc = 0; TEST_LOOPING(lc); lc++) {
95		tst_count = 0;
96		for (i = 0; i < TST_TOTAL; i++)
97			linkat_verify(&test_cases[i]);
98	}
99
100	cleanup();
101	tst_exit();
102}
103
104static void linkat_verify(const struct test_struct *desc)
105{
106	if (desc->expected_errno == EMLINK && max_hardlinks == 0) {
107		tst_resm(TCONF, "EMLINK test is not appropriate");
108		return;
109	}
110
111	if (desc->setupfunc != NULL) {
112		desc->setupfunc();
113	}
114
115	TEST(tst_syscall(__NR_linkat, AT_FDCWD, desc->oldfname,
116			 AT_FDCWD, desc->newfname, desc->flags));
117
118	if (desc->cleanfunc != NULL)
119		desc->cleanfunc();
120
121	if (TEST_RETURN != -1) {
122		tst_resm(TFAIL,
123			 "linkat(""AT_FDCWD"", %s, ""AT_FDCWD"", %s, %d) "
124			 "succeeded unexpectedly", desc->oldfname,
125			 desc->newfname, desc->flags);
126		return;
127	}
128
129	if (TEST_ERRNO == desc->expected_errno) {
130		tst_resm(TPASS | TTERRNO, "linkat failed as expected");
131	} else {
132		tst_resm(TFAIL | TTERRNO,
133			 "linkat failed unexpectedly; expected: "
134			 "%d - %s", desc->expected_errno,
135			 strerror(desc->expected_errno));
136	}
137}
138
139static void setup(void)
140{
141	tst_require_root();
142
143	tst_sig(NOFORK, DEF_HANDLER, cleanup);
144
145	tst_tmpdir();
146
147	fs_type = tst_dev_fs_type();
148	device = tst_acquire_device(cleanup);
149
150	if (!device)
151		tst_brkm(TCONF, cleanup, "Failed to acquire device");
152
153	TEST_PAUSE;
154
155	ltpuser = SAFE_GETPWNAM(cleanup, "nobody");
156
157	SAFE_TOUCH(cleanup, TEST_FILE, 0644, NULL);
158
159	memset(nametoolong, 'a', PATH_MAX+1);
160
161	SAFE_TOUCH(cleanup, TEST_EXIST, 0644, NULL);
162
163	SAFE_SYMLINK(cleanup, TEST_ELOOP, "test_file_eloop2");
164	SAFE_SYMLINK(cleanup, "test_file_eloop2", TEST_ELOOP);
165
166	SAFE_MKDIR(cleanup, "./tmp", DIR_MODE);
167	SAFE_TOUCH(cleanup, TEST_EACCES, 0666, NULL);
168
169	tst_mkfs(cleanup, device, fs_type, NULL, NULL);
170	SAFE_MKDIR(cleanup, "mntpoint", DIR_MODE);
171
172	SAFE_MOUNT(cleanup, device, "mntpoint", fs_type, 0, NULL);
173	mount_flag = 1;
174
175	max_hardlinks = tst_fs_fill_hardlinks(cleanup, "emlink_dir");
176}
177
178static void setup_eacces(void)
179{
180	SAFE_SETEUID(cleanup, ltpuser->pw_uid);
181}
182
183static void cleanup_eacces(void)
184{
185	SAFE_SETEUID(cleanup, 0);
186}
187
188static void setup_erofs(void)
189{
190	SAFE_MOUNT(cleanup, device, "mntpoint", fs_type,
191		   MS_REMOUNT | MS_RDONLY, NULL);
192	mount_flag = 1;
193}
194
195static void cleanup(void)
196{
197	if (mount_flag && tst_umount("mntpoint") < 0)
198		tst_resm(TWARN | TERRNO, "umount device:%s failed", device);
199
200	if (device)
201		tst_release_device(device);
202
203	tst_rmdir();
204}
205