summaryrefslogtreecommitdiff
path: root/bin/gensquashfs/fstree_from_dir.c
blob: 5b3f0031032e26a4f6deb94af9993457868b2631 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
 * fstree_from_dir.c
 *
 * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
 */
#include "config.h"
#include "mkfs.h"

#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#if defined(_WIN32) || defined(__WINDOWS__)
#define UNIX_EPOCH_ON_W32 11644473600UL
#define W32_TICS_PER_SEC 10000000UL

static sqfs_u32 w32time_to_sqfs_time(const FILETIME *ft)
{
	sqfs_u64 w32ts;

	w32ts = ft->dwHighDateTime;
	w32ts <<= 32UL;
	w32ts |= ft->dwLowDateTime;

	w32ts /= W32_TICS_PER_SEC;

	if (w32ts <= UNIX_EPOCH_ON_W32)
		return 0;

	w32ts -= UNIX_EPOCH_ON_W32;

	return (w32ts < 0x0FFFFFFFFUL) ? w32ts : 0xFFFFFFFF;
}

static int add_node(fstree_t *fs, tree_node_t *root,
		    scan_node_callback cb, void *user,
		    unsigned int flags,
		    const LPWIN32_FIND_DATAW entry)
{
	tree_node_t *n;
	DWORD length;

	if (entry->cFileName[0] == '.') {
		if (entry->cFileName[1] == '\0')
			return 0;

		if (entry->cFileName[1] == '.' && entry->cFileName[2] == '\0')
			return 0;
	}

	length = WideCharToMultiByte(CP_UTF8, 0, entry->cFileName,
				     -1, NULL, 0, NULL, NULL);
	if (length <= 0) {
		w32_perror("converting path to UTF-8");
		return -1;
	}

	n = calloc(1, sizeof(*n) + length + 1);
	if (n == NULL) {
		fprintf(stderr, "creating tree node: out-of-memory\n");
		return -1;
	}

	n->name = (char *)n->payload;
	WideCharToMultiByte(CP_UTF8, 0, entry->cFileName, -1,
			    n->name, length + 1, NULL, NULL);

	if (entry->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
		if (flags & DIR_SCAN_NO_DIR) {
			free(n);
			return 0;
		}

		n->mode = S_IFDIR | 0755;
	} else {
		if (flags & DIR_SCAN_NO_FILE) {
			free(n);
			return 0;
		}

		n->mode = S_IFREG | 0644;
	}

	if (cb != NULL) {
		int ret = cb(user, fs, n);

		if (ret != 0) {
			free(n);
			return ret < 0 ? ret : 0;
		}
	}

	if (flags & DIR_SCAN_KEEP_TIME) {
		n->mod_time = w32time_to_sqfs_time(&(entry->ftLastWriteTime));
	} else {
		n->mod_time = fs->defaults.st_mtime;
	}

	fstree_insert_sorted(root, n);
	return 0;
}

static int scan_dir(fstree_t *fs, tree_node_t *root,
		    const char *path, const WCHAR *wpath,
		    scan_node_callback cb, void *user,
		    unsigned int flags)
{
	WIN32_FIND_DATAW entry;
	HANDLE dirhnd;

	dirhnd = FindFirstFileW(wpath, &entry);

	if (dirhnd == INVALID_HANDLE_VALUE)
		goto fail_perror;

	do {
		if (add_node(fs, root, cb, user, flags, &entry))
			goto fail;
	} while (FindNextFileW(dirhnd, &entry));

	if (GetLastError() != ERROR_NO_MORE_FILES)
		goto fail_perror;

	FindClose(dirhnd);
	return 0;
fail_perror:
	w32_perror(path);
fail:
	if (dirhnd != INVALID_HANDLE_VALUE)
		FindClose(dirhnd);
	return -1;
}

int fstree_from_dir(fstree_t *fs, tree_node_t *root,
		    const char *path, scan_node_callback cb,
		    void *user, unsigned int flags)
{
	WCHAR *wpath = NULL, *new = NULL;
	size_t len, newlen;
	tree_node_t *n;

	/* path -> to_wchar(path) + L"\*" */
	wpath = path_to_windows(path);
	if (wpath == NULL) {
		fprintf(stderr, "%s: allocation failure.\n", path);
		return -1;
	}

	for (len = 0; wpath[len] != '\0'; ++len)
		;

	newlen = len + 1;

	if (len > 0 && wpath[len - 1] != '\\')
		newlen += 1;

	new = realloc(wpath, sizeof(wpath[0]) * (newlen + 1));
	if (new == NULL) {
		fprintf(stderr, "%s: allocation failure.\n", path);
		goto fail;
	}

	wpath = new;

	if (len > 0 && wpath[len - 1] != '\\')
		wpath[len++] = '\\';

	wpath[len++] = '*';
	wpath[len++] = '\0';

	/* scan directory contents */
	if (scan_dir(fs, root, path, wpath, cb, user, flags))
		goto fail;

	free(wpath);
	wpath = NULL;

	/* recursion step */
	if (flags & DIR_SCAN_NO_RECURSION)
		return 0;

	for (n = root->data.dir.children; n != NULL; n = n->next) {
		if (!S_ISDIR(n->mode))
			continue;

		if (fstree_from_subdir(fs, n, path, n->name, cb, user, flags))
			return -1;
	}

	return 0;
fail:
	free(wpath);
	return -1;
}

int fstree_from_subdir(fstree_t *fs, tree_node_t *root,
		       const char *path, const char *subdir,
		       scan_node_callback cb, void *user,
		       unsigned int flags)
{
	size_t len, plen, slen;
	WCHAR *wpath = NULL;
	char *temp = NULL;
	tree_node_t *n;

	plen = strlen(path);
	slen = subdir == NULL ? 0 : strlen(subdir);

	if (slen == 0)
		return fstree_from_dir(fs, root, path, cb, user, flags);

	len = plen + 1 + slen + 2;

	temp = calloc(1, len + 1);
	if (temp == NULL) {
		fprintf(stderr, "%s/%s: allocation failure.\n", path, subdir);
		return -1;
	}

	memcpy(temp, path, plen);
	temp[plen] = '/';
	memcpy(temp + plen + 1, subdir, slen);
	temp[plen + 1 + slen    ] = '/';
	temp[plen + 1 + slen + 1] = '*';
	temp[plen + 1 + slen + 2] = '\0';

	wpath = path_to_windows(temp);
	if (wpath == NULL) {
		fprintf(stderr, "%s: allocation failure.\n", temp);
		goto fail;
	}

	if (scan_dir(fs, root, temp, wpath, cb, user, flags))
		goto fail;

	free(wpath);
	wpath = NULL;

	if (flags & DIR_SCAN_NO_RECURSION) {
		free(temp);
		return 0;
	}

	temp[plen + 1 + slen] = '\0';

	for (n = root->data.dir.children; n != NULL; n = n->next) {
		if (!S_ISDIR(n->mode))
			continue;

		if (fstree_from_subdir(fs, n, temp, n->name, cb, user, flags))
			goto fail;
	}

	free(temp);
	return 0;
fail:
	free(temp);
	free(wpath);
	return -1;

}
#else
static void discard_node(tree_node_t *root, tree_node_t *n)
{
	tree_node_t *it;

	if (n == root->data.dir.children) {
		root->data.dir.children = n->next;
	} else {
		it = root->data.dir.children;

		while (it != NULL && it->next != n)
			it = it->next;

		if (it != NULL)
			it->next = n->next;
	}

	free(n);
}

static int populate_dir(int dir_fd, fstree_t *fs, tree_node_t *root,
			dev_t devstart, scan_node_callback cb,
			void *user, unsigned int flags)
{
	char *extra = NULL;
	struct dirent *ent;
	int ret, childfd;
	struct stat sb;
	tree_node_t *n;
	DIR *dir;

	dir = fdopendir(dir_fd);
	if (dir == NULL) {
		perror("fdopendir");
		close(dir_fd);
		return -1;
	}

	/* XXX: fdopendir can dup and close dir_fd internally
	   and still be compliant with the spec. */
	dir_fd = dirfd(dir);

	for (;;) {
		errno = 0;
		ent = readdir(dir);

		if (ent == NULL) {
			if (errno) {
				perror("readdir");
				goto fail;
			}
			break;
		}

		if (!strcmp(ent->d_name, "..") || !strcmp(ent->d_name, "."))
			continue;

		if (fstatat(dir_fd, ent->d_name, &sb, AT_SYMLINK_NOFOLLOW)) {
			perror(ent->d_name);
			goto fail;
		}

		switch (sb.st_mode & S_IFMT) {
		case S_IFSOCK:
			if (flags & DIR_SCAN_NO_SOCK)
				continue;
			break;
		case S_IFLNK:
			if (flags & DIR_SCAN_NO_SLINK)
				continue;
			break;
		case S_IFREG:
			if (flags & DIR_SCAN_NO_FILE)
				continue;
			break;
		case S_IFBLK:
			if (flags & DIR_SCAN_NO_BLK)
				continue;
			break;
		case S_IFCHR:
			if (flags & DIR_SCAN_NO_CHR)
				continue;
			break;
		case S_IFIFO:
			if (flags & DIR_SCAN_NO_FIFO)
				continue;
			break;
		default:
			break;
		}

		if ((flags & DIR_SCAN_ONE_FILESYSTEM) && sb.st_dev != devstart)
			continue;

		if (S_ISLNK(sb.st_mode)) {
			size_t size;

			if ((sizeof(sb.st_size) > sizeof(size_t)) &&
			    sb.st_size > SIZE_MAX) {
				errno = EOVERFLOW;
				goto fail_rdlink;
			}

			if (SZ_ADD_OV((size_t)sb.st_size, 1, &size)) {
				errno = EOVERFLOW;
				goto fail_rdlink;
			}

			extra = calloc(1, size);
			if (extra == NULL)
				goto fail_rdlink;

			if (readlinkat(dir_fd, ent->d_name,
				       extra, (size_t)sb.st_size) < 0) {
				goto fail_rdlink;
			}

			extra[sb.st_size] = '\0';
		}

		if (!(flags & DIR_SCAN_KEEP_TIME))
			sb.st_mtime = fs->defaults.st_mtime;

		if (S_ISDIR(sb.st_mode) && (flags & DIR_SCAN_NO_DIR)) {
			n = fstree_get_node_by_path(fs, root, ent->d_name,
						    false, false);
			if (n == NULL)
				continue;

			ret = 0;
		} else {
			n = fstree_mknode(root, ent->d_name,
					  strlen(ent->d_name), extra, &sb);
			if (n == NULL) {
				perror("creating tree node");
				goto fail;
			}

			ret = (cb == NULL) ? 0 : cb(user, fs, n);
		}

		free(extra);
		extra = NULL;

		if (ret < 0)
			goto fail;

		if (ret > 0) {
			discard_node(root, n);
			continue;
		}

		if (S_ISDIR(n->mode) && !(flags & DIR_SCAN_NO_RECURSION)) {
			childfd = openat(dir_fd, n->name, O_DIRECTORY |
					 O_RDONLY | O_CLOEXEC);
			if (childfd < 0) {
				perror(n->name);
				goto fail;
			}

			if (populate_dir(childfd, fs, n, devstart,
					 cb, user, flags)) {
				goto fail;
			}
		}
	}

	closedir(dir);
	return 0;
fail_rdlink:
	perror("readlink");
fail:
	closedir(dir);
	free(extra);
	return -1;
}

int fstree_from_subdir(fstree_t *fs, tree_node_t *root,
		       const char *path, const char *subdir,
		       scan_node_callback cb, void *user,
		       unsigned int flags)
{
	struct stat sb;
	int fd, subfd;

	if (!S_ISDIR(root->mode)) {
		fprintf(stderr,
			"scanning %s/%s into %s: target is not a directory\n",
			path, subdir == NULL ? "" : subdir, root->name);
		return -1;
	}

	fd = open(path, O_DIRECTORY | O_RDONLY | O_CLOEXEC);
	if (fd < 0) {
		perror(path);
		return -1;
	}

	if (subdir != NULL) {
		subfd = openat(fd, subdir, O_DIRECTORY | O_RDONLY | O_CLOEXEC);

		if (subfd < 0) {
			fprintf(stderr, "%s/%s: %s\n", path, subdir,
				strerror(errno));
			close(fd);
			return -1;
		}

		close(fd);
		fd = subfd;
	}

	if (fstat(fd, &sb)) {
		fprintf(stderr, "%s/%s: %s\n", path,
			subdir == NULL ? "" : subdir,
			strerror(errno));
		close(fd);
		return -1;
	}

	return populate_dir(fd, fs, root, sb.st_dev, cb, user, flags);
}

int fstree_from_dir(fstree_t *fs, tree_node_t *root,
		    const char *path, scan_node_callback cb,
		    void *user, unsigned int flags)
{
	return fstree_from_subdir(fs, root, path, NULL, cb, user, flags);
}
#endif