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libext2fs: fix memory leak in error path while opening test_io manager
[tools/e2fsprogs.git] / lib / ext2fs / test_io.c
1 /*
2  * test_io.c --- This is the Test I/O interface.
3  *
4  * Copyright (C) 1996 Theodore Ts'o.
5  *
6  * %Begin-Header%
7  * This file may be redistributed under the terms of the GNU Library
8  * General Public License, version 2.
9  * %End-Header%
10  */
11
12 #include "config.h"
13 #include <stdio.h>
14 #include <string.h>
15 #if HAVE_UNISTD_H
16 #include <unistd.h>
17 #endif
18 #include <fcntl.h>
19 #include <time.h>
20 #if HAVE_SYS_STAT_H
21 #include <sys/stat.h>
22 #endif
23 #if HAVE_SYS_TYPES_H
24 #include <sys/types.h>
25 #endif
26 #ifdef HAVE_SYS_PRCTL_H
27 #include <sys/prctl.h>
28 #else
29 #define PR_GET_DUMPABLE 3
30 #endif
31 #if (!defined(HAVE_PRCTL) && defined(linux))
32 #include <sys/syscall.h>
33 #endif
34
35 #include "ext2_fs.h"
36 #include "ext2fs.h"
37
38 /*
39  * For checking structure magic numbers...
40  */
41
42 #define EXT2_CHECK_MAGIC(struct, code) \
43           if ((struct)->magic != (code)) return (code)
44
45 struct test_private_data {
46         int     magic;
47         io_channel real;
48         int flags;
49         FILE *outfile;
50         unsigned long block;
51         int read_abort_count, write_abort_count;
52         void (*read_blk)(unsigned long block, int count, errcode_t err);
53         void (*write_blk)(unsigned long block, int count, errcode_t err);
54         void (*set_blksize)(int blksize, errcode_t err);
55         void (*write_byte)(unsigned long block, int count, errcode_t err);
56         void (*read_blk64)(unsigned long long block, int count, errcode_t err);
57         void (*write_blk64)(unsigned long long block, int count, errcode_t err);
58 };
59
60 /*
61  * These global variable can be set by the test program as
62  * necessary *before* calling test_open
63  */
64 io_manager test_io_backing_manager = 0;
65 void (*test_io_cb_read_blk)
66         (unsigned long block, int count, errcode_t err) = 0;
67 void (*test_io_cb_write_blk)
68         (unsigned long block, int count, errcode_t err) = 0;
69 void (*test_io_cb_read_blk64)
70         (unsigned long long block, int count, errcode_t err) = 0;
71 void (*test_io_cb_write_blk64)
72         (unsigned long long block, int count, errcode_t err) = 0;
73 void (*test_io_cb_set_blksize)
74         (int blksize, errcode_t err) = 0;
75 void (*test_io_cb_write_byte)
76         (unsigned long block, int count, errcode_t err) = 0;
77
78 /*
79  * Test flags
80  */
81 #define TEST_FLAG_READ                  0x01
82 #define TEST_FLAG_WRITE                 0x02
83 #define TEST_FLAG_SET_BLKSIZE           0x04
84 #define TEST_FLAG_FLUSH                 0x08
85 #define TEST_FLAG_DUMP                  0x10
86 #define TEST_FLAG_SET_OPTION            0x20
87 #define TEST_FLAG_DISCARD               0x40
88 #define TEST_FLAG_READAHEAD             0x80
89 #define TEST_FLAG_ZEROOUT               0x100
90
91 static void test_dump_block(io_channel channel,
92                             struct test_private_data *data,
93                             unsigned long block, const void *buf)
94 {
95         const unsigned char *cp;
96         FILE *f = data->outfile;
97         int     i;
98         unsigned long   cksum = 0;
99
100         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
101                 cksum += *cp;
102         }
103         fprintf(f, "Contents of block %lu, checksum %08lu: \n", block, cksum);
104         for (i=0, cp = buf; i < channel->block_size; i++, cp++) {
105                 if ((i % 16) == 0)
106                         fprintf(f, "%04x: ", i);
107                 fprintf(f, "%02x%c", *cp, ((i % 16) == 15) ? '\n' : ' ');
108         }
109 }
110
111 /*
112  * Flush data buffers to disk.
113  */
114 static errcode_t test_flush(io_channel channel)
115 {
116         struct test_private_data        *data;
117         errcode_t                       retval = 0;
118
119         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
120         data = (struct test_private_data *)channel->private_data;
121         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
122
123         if (data->real)
124                 retval = io_channel_flush(data->real);
125
126         if (data->flags & TEST_FLAG_FLUSH)
127                 fprintf(data->outfile, "Test_io: flush() returned %s\n",
128                         retval ? error_message(retval) : "OK");
129
130         return retval;
131 }
132
133 static void test_abort(io_channel channel, unsigned long block)
134 {
135         struct test_private_data *data;
136         FILE *f;
137
138         data = (struct test_private_data *) channel->private_data;
139         f = data->outfile;
140         test_flush(channel);
141
142         fprintf(f, "Aborting due to I/O to block %lu\n", block);
143         fflush(f);
144         abort();
145 }
146
147 static char *safe_getenv(const char *arg)
148 {
149 #if !defined(_WIN32)
150         if ((getuid() != geteuid()) || (getgid() != getegid()))
151                 return NULL;
152 #endif
153 #if HAVE_PRCTL
154         if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
155                 return NULL;
156 #else
157 #if (defined(linux) && defined(SYS_prctl))
158         if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
159                 return NULL;
160 #endif
161 #endif
162
163 #if defined(HAVE_SECURE_GETENV)
164         return secure_getenv(arg);
165 #elif defined(HAVE___SECURE_GETENV)
166         return __secure_getenv(arg);
167 #else
168         return getenv(arg);
169 #endif
170 }
171
172 static errcode_t test_open(const char *name, int flags, io_channel *channel)
173 {
174         io_channel      io = NULL;
175         struct test_private_data *data = NULL;
176         errcode_t       retval;
177         char            *value;
178
179         if (name == 0)
180                 return EXT2_ET_BAD_DEVICE_NAME;
181         retval = ext2fs_get_mem(sizeof(struct struct_io_channel), &io);
182         if (retval)
183                 goto cleanup;
184         memset(io, 0, sizeof(struct struct_io_channel));
185         io->magic = EXT2_ET_MAGIC_IO_CHANNEL;
186         retval = ext2fs_get_mem(sizeof(struct test_private_data), &data);
187         if (retval)
188                 goto cleanup;
189         io->manager = test_io_manager;
190         retval = ext2fs_get_mem(strlen(name)+1, &io->name);
191         if (retval)
192                 goto cleanup;
193
194         strcpy(io->name, name);
195         io->private_data = data;
196         io->block_size = 1024;
197         io->read_error = 0;
198         io->write_error = 0;
199         io->refcount = 1;
200         io->flags = 0;
201
202         memset(data, 0, sizeof(struct test_private_data));
203         data->magic = EXT2_ET_MAGIC_TEST_IO_CHANNEL;
204         if (test_io_backing_manager) {
205                 retval = test_io_backing_manager->open(name, flags,
206                                                        &data->real);
207                 if (retval)
208                         goto cleanup;
209         } else {
210                 data->real = 0;
211         }
212         data->read_blk =        test_io_cb_read_blk;
213         data->write_blk =       test_io_cb_write_blk;
214         data->set_blksize =     test_io_cb_set_blksize;
215         data->write_byte =      test_io_cb_write_byte;
216         data->read_blk64 =      test_io_cb_read_blk64;
217         data->write_blk64 =     test_io_cb_write_blk64;
218
219         data->outfile = NULL;
220         if ((value = safe_getenv("TEST_IO_LOGFILE")) != NULL)
221                 data->outfile = fopen(value, "w");
222         if (!data->outfile)
223                 data->outfile = stderr;
224
225         data->flags = 0;
226         if ((value = safe_getenv("TEST_IO_FLAGS")) != NULL)
227                 data->flags = strtoul(value, NULL, 0);
228
229         data->block = 0;
230         if ((value = safe_getenv("TEST_IO_BLOCK")) != NULL)
231                 data->block = strtoul(value, NULL, 0);
232
233         data->read_abort_count = 0;
234         if ((value = safe_getenv("TEST_IO_READ_ABORT")) != NULL)
235                 data->read_abort_count = strtoul(value, NULL, 0);
236
237         data->write_abort_count = 0;
238         if ((value = safe_getenv("TEST_IO_WRITE_ABORT")) != NULL)
239                 data->write_abort_count = strtoul(value, NULL, 0);
240
241         if (data->real) {
242                 io->align = data->real->align;
243                 if (data->real->flags & CHANNEL_FLAGS_THREADS)
244                         io->flags |= CHANNEL_FLAGS_THREADS;
245         }
246
247         *channel = io;
248         return 0;
249
250 cleanup:
251         if (io && io->name)
252                 ext2fs_free_mem(&io->name);
253         if (io)
254                 ext2fs_free_mem(&io);
255         if (data)
256                 ext2fs_free_mem(&data);
257         return retval;
258 }
259
260 static errcode_t test_close(io_channel channel)
261 {
262         struct test_private_data *data;
263         errcode_t       retval = 0;
264
265         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
266         data = (struct test_private_data *) channel->private_data;
267         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
268
269         if (--channel->refcount > 0)
270                 return 0;
271
272         if (data->real)
273                 retval = io_channel_close(data->real);
274
275         if (data->outfile && data->outfile != stderr)
276                 fclose(data->outfile);
277
278         ext2fs_free_mem(&channel->private_data);
279         if (channel->name)
280                 ext2fs_free_mem(&channel->name);
281         ext2fs_free_mem(&channel);
282         return retval;
283 }
284
285 static errcode_t test_set_blksize(io_channel channel, int blksize)
286 {
287         struct test_private_data *data;
288         errcode_t       retval = 0;
289
290         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
291         data = (struct test_private_data *) channel->private_data;
292         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
293
294         if (data->real) {
295                 retval = io_channel_set_blksize(data->real, blksize);
296                 channel->align = data->real->align;
297         }
298         if (data->set_blksize)
299                 data->set_blksize(blksize, retval);
300         if (data->flags & TEST_FLAG_SET_BLKSIZE)
301                 fprintf(data->outfile,
302                         "Test_io: set_blksize(%d) returned %s\n",
303                         blksize, retval ? error_message(retval) : "OK");
304         channel->block_size = blksize;
305         return retval;
306 }
307
308
309 static errcode_t test_read_blk(io_channel channel, unsigned long block,
310                                int count, void *buf)
311 {
312         struct test_private_data *data;
313         errcode_t       retval = 0;
314
315         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
316         data = (struct test_private_data *) channel->private_data;
317         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
318
319         if (data->real)
320                 retval = io_channel_read_blk(data->real, block, count, buf);
321         if (data->read_blk)
322                 data->read_blk(block, count, retval);
323         if (data->flags & TEST_FLAG_READ)
324                 fprintf(data->outfile,
325                         "Test_io: read_blk(%lu, %d) returned %s\n",
326                         block, count, retval ? error_message(retval) : "OK");
327         if (data->block && data->block == block) {
328                 if (data->flags & TEST_FLAG_DUMP)
329                         test_dump_block(channel, data, block, buf);
330                 if (--data->read_abort_count == 0)
331                         test_abort(channel, block);
332         }
333         return retval;
334 }
335
336 static errcode_t test_write_blk(io_channel channel, unsigned long block,
337                                int count, const void *buf)
338 {
339         struct test_private_data *data;
340         errcode_t       retval = 0;
341
342         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
343         data = (struct test_private_data *) channel->private_data;
344         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
345
346         if (data->real)
347                 retval = io_channel_write_blk(data->real, block, count, buf);
348         if (data->write_blk)
349                 data->write_blk(block, count, retval);
350         if (data->flags & TEST_FLAG_WRITE)
351                 fprintf(data->outfile,
352                         "Test_io: write_blk(%lu, %d) returned %s\n",
353                         block, count, retval ? error_message(retval) : "OK");
354         if (data->block && data->block == block) {
355                 if (data->flags & TEST_FLAG_DUMP)
356                         test_dump_block(channel, data, block, buf);
357                 if (--data->write_abort_count == 0)
358                         test_abort(channel, block);
359         }
360         return retval;
361 }
362
363 static errcode_t test_read_blk64(io_channel channel, unsigned long long block,
364                                int count, void *buf)
365 {
366         struct test_private_data *data;
367         errcode_t       retval = 0;
368
369         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
370         data = (struct test_private_data *) channel->private_data;
371         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
372
373         if (data->real)
374                 retval = io_channel_read_blk64(data->real, block, count, buf);
375         if (data->read_blk64)
376                 data->read_blk64(block, count, retval);
377         if (data->flags & TEST_FLAG_READ)
378                 fprintf(data->outfile,
379                         "Test_io: read_blk64(%llu, %d) returned %s\n",
380                         block, count, retval ? error_message(retval) : "OK");
381         if (data->block && data->block == block) {
382                 if (data->flags & TEST_FLAG_DUMP)
383                         test_dump_block(channel, data, block, buf);
384                 if (--data->read_abort_count == 0)
385                         test_abort(channel, block);
386         }
387         return retval;
388 }
389
390 static errcode_t test_write_blk64(io_channel channel, unsigned long long block,
391                                int count, const void *buf)
392 {
393         struct test_private_data *data;
394         errcode_t       retval = 0;
395
396         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
397         data = (struct test_private_data *) channel->private_data;
398         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
399
400         if (data->real)
401                 retval = io_channel_write_blk64(data->real, block, count, buf);
402         if (data->write_blk64)
403                 data->write_blk64(block, count, retval);
404         if (data->flags & TEST_FLAG_WRITE)
405                 fprintf(data->outfile,
406                         "Test_io: write_blk64(%llu, %d) returned %s\n",
407                         block, count, retval ? error_message(retval) : "OK");
408         if (data->block && data->block == block) {
409                 if (data->flags & TEST_FLAG_DUMP)
410                         test_dump_block(channel, data, block, buf);
411                 if (--data->write_abort_count == 0)
412                         test_abort(channel, block);
413         }
414         return retval;
415 }
416
417 static errcode_t test_write_byte(io_channel channel, unsigned long offset,
418                                int count, const void *buf)
419 {
420         struct test_private_data *data;
421         errcode_t       retval = 0;
422
423         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
424         data = (struct test_private_data *) channel->private_data;
425         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
426
427         if (data->real && data->real->manager->write_byte)
428                 retval = io_channel_write_byte(data->real, offset, count, buf);
429         if (data->write_byte)
430                 data->write_byte(offset, count, retval);
431         if (data->flags & TEST_FLAG_WRITE)
432                 fprintf(data->outfile,
433                         "Test_io: write_byte(%lu, %d) returned %s\n",
434                         offset, count, retval ? error_message(retval) : "OK");
435         return retval;
436 }
437
438 static errcode_t test_set_option(io_channel channel, const char *option,
439                                  const char *arg)
440 {
441         struct test_private_data *data;
442         errcode_t       retval = 0;
443
444         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
445         data = (struct test_private_data *) channel->private_data;
446         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
447
448
449         if (data->flags & TEST_FLAG_SET_OPTION)
450                 fprintf(data->outfile, "Test_io: set_option(%s, %s) ",
451                         option, arg);
452         if (data->real && data->real->manager->set_option) {
453                 retval = (data->real->manager->set_option)(data->real,
454                                                            option, arg);
455                 if (data->flags & TEST_FLAG_SET_OPTION)
456                         fprintf(data->outfile, "returned %s\n",
457                                 retval ? error_message(retval) : "OK");
458         } else {
459                 if (data->flags & TEST_FLAG_SET_OPTION)
460                         fprintf(data->outfile, "not implemented\n");
461         }
462         return retval;
463 }
464
465 static errcode_t test_get_stats(io_channel channel, io_stats *stats)
466 {
467         struct test_private_data *data;
468         errcode_t       retval = 0;
469
470         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
471         data = (struct test_private_data *) channel->private_data;
472         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
473
474         if (data->real && data->real->manager->get_stats) {
475                 retval = (data->real->manager->get_stats)(data->real, stats);
476         }
477         return retval;
478 }
479
480 static errcode_t test_discard(io_channel channel, unsigned long long block,
481                               unsigned long long count)
482 {
483         struct test_private_data *data;
484         errcode_t       retval = 0;
485
486         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
487         data = (struct test_private_data *) channel->private_data;
488         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
489
490         if (data->real)
491                 retval = io_channel_discard(data->real, block, count);
492         if (data->flags & TEST_FLAG_DISCARD)
493                 fprintf(data->outfile,
494                         "Test_io: discard(%llu, %llu) returned %s\n",
495                         block, count, retval ? error_message(retval) : "OK");
496         return retval;
497 }
498
499 static errcode_t test_cache_readahead(io_channel channel,
500                                       unsigned long long block,
501                                       unsigned long long count)
502 {
503         struct test_private_data *data;
504         errcode_t       retval = 0;
505
506         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
507         data = (struct test_private_data *) channel->private_data;
508         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
509
510         if (data->real)
511                 retval = io_channel_cache_readahead(data->real, block, count);
512         if (data->flags & TEST_FLAG_READAHEAD)
513                 fprintf(data->outfile,
514                         "Test_io: readahead(%llu, %llu) returned %s\n",
515                         block, count, retval ? error_message(retval) : "OK");
516         return retval;
517 }
518
519 static errcode_t test_zeroout(io_channel channel, unsigned long long block,
520                               unsigned long long count)
521 {
522         struct test_private_data *data;
523         errcode_t       retval = 0;
524
525         EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
526         data = (struct test_private_data *) channel->private_data;
527         EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_TEST_IO_CHANNEL);
528
529         if (data->real)
530                 retval = io_channel_zeroout(data->real, block, count);
531         if (data->flags & TEST_FLAG_ZEROOUT)
532                 fprintf(data->outfile,
533                         "Test_io: zeroout(%llu, %llu) returned %s\n",
534                         block, count, retval ? error_message(retval) : "OK");
535         return retval;
536 }
537
538 static struct struct_io_manager struct_test_manager = {
539         .magic          = EXT2_ET_MAGIC_IO_MANAGER,
540         .name           = "Test I/O Manager",
541         .open           = test_open,
542         .close          = test_close,
543         .set_blksize    = test_set_blksize,
544         .read_blk       = test_read_blk,
545         .write_blk      = test_write_blk,
546         .flush          = test_flush,
547         .write_byte     = test_write_byte,
548         .set_option     = test_set_option,
549         .get_stats      = test_get_stats,
550         .read_blk64     = test_read_blk64,
551         .write_blk64    = test_write_blk64,
552         .discard        = test_discard,
553         .cache_readahead        = test_cache_readahead,
554         .zeroout        = test_zeroout,
555 };
556
557 io_manager test_io_manager = &struct_test_manager;