1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * Test Description:
22 * Verify that access() succeeds to check the read/write/execute permissions
23 * on a file if the mode argument passed was R_OK/W_OK/X_OK.
24 *
25 * Also verify that, access() succeeds to test the accessibility of the file
26 * referred to by symbolic link if the pathname points to a symbolic link.
27 *
28 * 07/2001 Ported by Wayne Boyer
29 */
30
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <stdio.h>
34 #include <unistd.h>
35 #include <errno.h>
36 #include <fcntl.h>
37 #include <string.h>
38 #include <signal.h>
39 #include <pwd.h>
40
41 #include "test.h"
42
43 #define TEMP_FILE "temp_file"
44 #define SYM_FILE "sym_file"
45 #define TEST_FILE1 "test_file1"
46 #define TEST_FILE2 "test_file2"
47 #define TEST_FILE3 "test_file3"
48 #define FILE_MODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)
49 #define EXE_MODE 0777
50
51 char *TCID = "access02";
52 int TST_TOTAL = 4;
53
54 static int fd1, fd2, fd4;
55 static const char nobody_uid[] = "nobody";
56 static struct passwd *ltpuser;
57
58 static int setup1(void);
59 static int setup2(void);
60 static int setup3(void);
61 static int setup4(void);
62
63 static struct test_case_t {
64 char *pathname;
65 mode_t a_mode;
66 int (*setupfunc) (void);
67 } test_cases[] = {
68 {TEST_FILE1, R_OK, setup1},
69 {TEST_FILE2, W_OK, setup2},
70 {TEST_FILE3, X_OK, setup3},
71 {SYM_FILE, W_OK, setup4},
72 };
73
74 static void setup(void);
75 static void cleanup(void);
76 static int access_verify(int);
77
main(int ac,char ** av)78 int main(int ac, char **av)
79 {
80 int lc;
81 int i;
82 mode_t access_mode;
83 char *file_name;
84
85 tst_parse_opts(ac, av, NULL, NULL);
86
87 setup();
88
89 for (lc = 0; TEST_LOOPING(lc); lc++) {
90 tst_count = 0;
91 for (i = 0; i < TST_TOTAL; i++) {
92 file_name = test_cases[i].pathname;
93 access_mode = test_cases[i].a_mode;
94
95 /*
96 * Call access(2) to check the test file
97 * for specified access mode permissions.
98 */
99 TEST(access(file_name, access_mode));
100
101 if (TEST_RETURN == -1) {
102 tst_resm(TFAIL | TTERRNO,
103 "access(%s, %#o) failed",
104 file_name, access_mode);
105 continue;
106 }
107
108 access_verify(i);
109 }
110 }
111
112 cleanup();
113 tst_exit();
114 }
115
setup(void)116 static void setup(void)
117 {
118 int i;
119
120 tst_require_root();
121 tst_sig(FORK, DEF_HANDLER, cleanup);
122
123 ltpuser = getpwnam(nobody_uid);
124 if (ltpuser == NULL)
125 tst_brkm(TBROK | TERRNO, NULL, "getpwnam failed");
126 if (setuid(ltpuser->pw_uid) == -1)
127 tst_brkm(TINFO | TERRNO, NULL, "setuid failed");
128
129 TEST_PAUSE;
130 tst_tmpdir();
131
132 for (i = 0; i < TST_TOTAL; i++)
133 test_cases[i].setupfunc();
134 }
135
136 /*
137 * setup1() - Setup function to test the functionality of access() for
138 * the access mode argument R_OK.
139 *
140 * Creat/open a testfile and write some data into it.
141 * This function returns 0.
142 */
setup1(void)143 static int setup1(void)
144 {
145 char write_buf[] = "abc";
146
147 fd1 = open(TEST_FILE1, O_RDWR | O_CREAT, FILE_MODE);
148 if (fd1 == -1) {
149 tst_brkm(TBROK | TERRNO, cleanup,
150 "open(%s, O_RDWR|O_CREAT, %#o) failed",
151 TEST_FILE1, FILE_MODE);
152 }
153
154 /* write some data into testfile */
155 if (write(fd1, write_buf, strlen(write_buf)) != strlen(write_buf)) {
156 tst_brkm(TBROK | TERRNO, cleanup,
157 "write(%s) failed in setup1", TEST_FILE1);
158 }
159
160 return 0;
161 }
162
163 /*
164 * setup2() - Setup function to test the functionality of access() for
165 * the access mode argument W_OK.
166 *
167 * Creat/open a testfile for writing under temporary directory.
168 * This function returns 0.
169 */
setup2(void)170 static int setup2(void)
171 {
172 fd2 = open(TEST_FILE2, O_RDWR | O_CREAT, FILE_MODE);
173 if (fd1 == -1) {
174 tst_brkm(TBROK | TERRNO, cleanup,
175 "open(%s, O_RDWR|O_CREAT, %#o) failed",
176 TEST_FILE2, FILE_MODE);
177 }
178
179 return 0;
180 }
181
182 /*
183 * setup3() - Setup function to test the functionality of access() for
184 * the access mode argument X_OK.
185 *
186 * Creat/open a testfile and provide execute permissions to it.
187 * This function returns 0.
188 */
setup3(void)189 static int setup3(void)
190 {
191 int fd3;
192 #ifdef UCLINUX
193 char exechead[] = "#!/bin/sh\n";
194 #endif
195
196 fd3 = open(TEST_FILE3, O_RDWR | O_CREAT, FILE_MODE);
197 if (fd3 == -1) {
198 tst_brkm(TBROK | TERRNO, cleanup,
199 "open(%s, O_RDWR|O_CREAT, %#o) failed",
200 TEST_FILE3, FILE_MODE);
201 }
202 #ifdef UCLINUX
203 if (write(fd3, exechead, sizeof(exechead)) < 0) {
204 tst_brkm(TBROK | TERRNO, cleanup, "write(%s) failed",
205 TEST_FILE3);
206 }
207 #endif
208
209 /* Close the test file created above */
210 if (close(fd3) == -1) {
211 tst_brkm(TBROK | TERRNO, cleanup, "close(%s) failed",
212 TEST_FILE3);
213 }
214
215 /* Set execute permission bits on the test file. */
216 if (chmod(TEST_FILE3, EXE_MODE) < 0) {
217 tst_brkm(TBROK | TERRNO, cleanup, "chmod(%s, %#o) failed",
218 TEST_FILE3, EXE_MODE);
219 }
220
221 return 0;
222 }
223
224 /*
225 * setup4() - Setup function to test the functionality of access() for
226 * symbolic link file.
227 *
228 * Creat/open a temporary file and close it.
229 * Creat a symbolic link of temporary file.
230 * This function returns 0.
231 */
setup4(void)232 static int setup4(void)
233 {
234 fd4 = open(TEMP_FILE, O_RDWR | O_CREAT, FILE_MODE);
235 if (fd4 == -1) {
236 tst_brkm(TBROK | TERRNO, cleanup,
237 "open(%s, O_RDWR|O_CREAT, %#o) failed",
238 TEMP_FILE, FILE_MODE);
239 }
240
241 /* Creat a symbolic link for temporary file */
242 if (symlink(TEMP_FILE, SYM_FILE) < 0) {
243 tst_brkm(TBROK | TERRNO, cleanup,
244 "symlink(%s, %s) failed", TEMP_FILE, SYM_FILE);
245 }
246
247 return 0;
248 }
249
250 /*
251 * access_verify(i) -
252 *
253 * This function verify the accessibility of the
254 * the testfile with the one verified by access().
255 */
access_verify(int i)256 static int access_verify(int i)
257 {
258 char write_buf[] = "abc";
259 char read_buf[BUFSIZ];
260 int rval;
261
262 rval = 0;
263
264 switch (i) {
265 case 0:
266 /*
267 * The specified file has read access.
268 * Attempt to read some data from the testfile
269 * and if successful, access() behaviour is
270 * correct.
271 */
272 rval = read(fd1, &read_buf, sizeof(read_buf));
273 if (rval == -1)
274 tst_resm(TFAIL | TERRNO, "read(%s) failed", TEST_FILE1);
275 break;
276 case 1:
277 /*
278 * The specified file has write access.
279 * Attempt to write some data to the testfile
280 * and if successful, access() behaviour is correct.
281 */
282 rval = write(fd2, write_buf, strlen(write_buf));
283 if (rval == -1)
284 tst_resm(TFAIL | TERRNO, "write(%s) failed",
285 TEST_FILE2);
286 break;
287 case 2:
288 /*
289 * The specified file has execute access.
290 * Attempt to execute the specified executable
291 * file, if successful, access() behaviour is correct.
292 */
293 rval = system("./" TEST_FILE3);
294 if (rval != 0)
295 tst_resm(TFAIL, "Fail to execute the %s", TEST_FILE3);
296 break;
297 case 3:
298 /*
299 * The file pointed to by symbolic link has
300 * write access.
301 * Attempt to write some data to this temporary file
302 * pointed to by symlink. if successful, access() bahaviour
303 * is correct.
304 */
305 rval = write(fd4, write_buf, strlen(write_buf));
306 if (rval == -1)
307 tst_resm(TFAIL | TERRNO, "write(%s) failed", TEMP_FILE);
308 break;
309 default:
310 break;
311 }
312
313 return rval;
314 }
315
cleanup(void)316 static void cleanup(void)
317 {
318 if (close(fd1) == -1)
319 tst_brkm(TFAIL | TERRNO, NULL, "close(%s) failed", TEST_FILE1);
320 if (close(fd2) == -1)
321 tst_brkm(TFAIL | TERRNO, NULL, "close(%s) failed", TEST_FILE2);
322 if (close(fd4) == -1)
323 tst_brkm(TFAIL | TERRNO, NULL, "close(%s) failed", TEMP_FILE);
324
325 tst_rmdir();
326 }
327