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 <fcntl.h>
25#include <unistd.h>
26#include <error.h>
27#include <stdlib.h>
28#include <errno.h>
29#include <string.h>
30#include <signal.h>
31#include <pwd.h>
32#include <sys/mount.h>
33
34#include "test.h"
35#include "linux_syscall_numbers.h"
36#include "safe_macros.h"
37#include "lapi/fcntl.h"
38
39#define DIR_MODE	(S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP| \
40			 S_IXGRP|S_IROTH|S_IXOTH)
41#define TEST_FILE	"testfile"
42#define TEST_EXIST	"testexist"
43#define TEST_ELOOP	"testeloop"
44#define TEST_EACCES	"./tmp/testeeacces"
45#define TEST_EACCES2	"./tmp/testeeacces2"
46#define TEST_EROFS	"mntpoint"
47#define TEST_EROFS2	"mntpoint/testerofs2"
48#define TEST_EMLINK	"emlink_dir/testfile0"
49#define TEST_EMLINK2	"emlink_dir/testfile"
50#define BASENAME	"mntpoint/basename"
51
52static char nametoolong[PATH_MAX+2];
53static const char *device;
54static int mount_flag;
55static int max_hardlinks;
56static const char *fs_type;
57
58static void setup(void);
59static void cleanup(void);
60static void setup_eacces(void);
61static void cleanup_eacces(void);
62static void setup_erofs(void);
63
64static struct test_struct {
65	const char *oldfname;
66	const char *newfname;
67	int flags;
68	int expected_errno;
69	void (*setupfunc) (void);
70	void (*cleanfunc) (void);
71} test_cases[] = {
72	{TEST_FILE, nametoolong, 0, ENAMETOOLONG, NULL, NULL},
73	{nametoolong, TEST_FILE, 0, ENAMETOOLONG, NULL, NULL},
74	{TEST_EXIST, TEST_EXIST, 0, EEXIST, NULL, NULL},
75	{TEST_ELOOP, TEST_FILE, AT_SYMLINK_FOLLOW, ELOOP, NULL, NULL},
76	{TEST_EACCES, TEST_EACCES2, 0, EACCES, setup_eacces, cleanup_eacces},
77	{TEST_EROFS, TEST_EROFS2, 0, EROFS, setup_erofs, NULL},
78	{TEST_EMLINK, TEST_EMLINK2, 0, EMLINK, NULL, NULL},
79};
80
81char *TCID = "linkat02";
82int TST_TOTAL = ARRAY_SIZE(test_cases);
83
84static struct passwd *ltpuser;
85static void linkat_verify(const struct test_struct *);
86
87int main(int ac, char **av)
88{
89	int lc;
90	int i;
91
92	tst_parse_opts(ac, av, NULL, NULL);
93
94	setup();
95
96	for (lc = 0; TEST_LOOPING(lc); lc++) {
97		tst_count = 0;
98		for (i = 0; i < TST_TOTAL; i++)
99			linkat_verify(&test_cases[i]);
100	}
101
102	cleanup();
103	tst_exit();
104}
105
106static void linkat_verify(const struct test_struct *desc)
107{
108	if (desc->expected_errno == EMLINK && max_hardlinks == 0) {
109		tst_resm(TCONF, "EMLINK test is not appropriate");
110		return;
111	}
112
113	if (desc->setupfunc != NULL) {
114		desc->setupfunc();
115	}
116
117	TEST(ltp_syscall(__NR_linkat, AT_FDCWD, desc->oldfname,
118			 AT_FDCWD, desc->newfname, desc->flags));
119
120	if (desc->cleanfunc != NULL)
121		desc->cleanfunc();
122
123	if (TEST_RETURN != -1) {
124		tst_resm(TFAIL,
125			 "linkat(""AT_FDCWD"", %s, ""AT_FDCWD"", %s, %d)"
126			 "succeeded unexpectedly", desc->oldfname,
127			 desc->newfname, desc->flags);
128		return;
129	}
130
131	if (TEST_ERRNO == desc->expected_errno) {
132		tst_resm(TPASS | TTERRNO, "linkat failed as expected");
133	} else {
134		tst_resm(TFAIL | TTERRNO,
135			 "linkat failed unexpectedly; expected: "
136			 "%d - %s", desc->expected_errno,
137			 strerror(desc->expected_errno));
138	}
139}
140
141static void setup(void)
142{
143	if ((tst_kvercmp(2, 6, 16)) < 0)
144		tst_brkm(TCONF, NULL, "This test needs kernel 2.6.16 or newer");
145
146	tst_require_root();
147
148	tst_sig(NOFORK, DEF_HANDLER, cleanup);
149
150	tst_tmpdir();
151
152	fs_type = tst_dev_fs_type();
153	device = tst_acquire_device(cleanup);
154
155	if (!device)
156		tst_brkm(TCONF, cleanup, "Failed to acquire device");
157
158	TEST_PAUSE;
159
160	ltpuser = SAFE_GETPWNAM(cleanup, "nobody");
161
162	SAFE_TOUCH(cleanup, TEST_FILE, 0644, NULL);
163
164	memset(nametoolong, 'a', PATH_MAX+1);
165
166	SAFE_TOUCH(cleanup, TEST_EXIST, 0644, NULL);
167
168	SAFE_SYMLINK(cleanup, TEST_ELOOP, "test_file_eloop2");
169	SAFE_SYMLINK(cleanup, "test_file_eloop2", TEST_ELOOP);
170
171	SAFE_MKDIR(cleanup, "./tmp", DIR_MODE);
172	SAFE_TOUCH(cleanup, TEST_EACCES, 0666, NULL);
173
174	tst_mkfs(cleanup, device, fs_type, NULL, NULL);
175	SAFE_MKDIR(cleanup, "mntpoint", DIR_MODE);
176
177	if (mount(device, "mntpoint", fs_type, 0, NULL) < 0) {
178		tst_brkm(TBROK | TERRNO, cleanup,
179			 "mount device:%s failed", device);
180	}
181	mount_flag = 1;
182
183	max_hardlinks = tst_fs_fill_hardlinks(cleanup, "emlink_dir");
184}
185
186static void setup_eacces(void)
187{
188	SAFE_SETEUID(cleanup, ltpuser->pw_uid);
189}
190
191static void cleanup_eacces(void)
192{
193	SAFE_SETEUID(cleanup, 0);
194}
195
196static void setup_erofs(void)
197{
198	if (mount(device, "mntpoint", fs_type,
199		  MS_REMOUNT | MS_RDONLY, NULL) < 0) {
200		tst_brkm(TBROK | TERRNO, cleanup, "remount device:%s failed",
201			 device);
202	}
203	mount_flag = 1;
204}
205
206static void cleanup(void)
207{
208	if (mount_flag && tst_umount("mntpoint") < 0)
209		tst_resm(TWARN | TERRNO, "umount device:%s failed", device);
210
211	if (device)
212		tst_release_device(device);
213
214	tst_rmdir();
215}
216