1 /* $NetBSD: cd9660_write.c,v 1.14 2011/01/04 09:48:21 wiz Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
5 *
6 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan
7 * Perez-Rathke and Ram Vedam. All rights reserved.
8 *
9 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys,
10 * Alan Perez-Rathke and Ram Vedam.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN
23 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN
27 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
30 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
34 * OF SUCH DAMAGE.
35 */
36
37 #include "cd9660.h"
38 #include "iso9660_rrip.h"
39
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
42
43 #include <util.h>
44
45 static int cd9660_write_volume_descriptors(iso9660_disk *, FILE *);
46 static int cd9660_write_path_table(iso9660_disk *, FILE *, off_t, int);
47 static int cd9660_write_path_tables(iso9660_disk *, FILE *);
48 static int cd9660_write_file(iso9660_disk *, FILE *, cd9660node *);
49 static int cd9660_write_filedata(iso9660_disk *, FILE *, off_t,
50 const unsigned char *, int);
51 #if 0
52 static int cd9660_write_buffered(FILE *, off_t, int, const unsigned char *);
53 #endif
54 static void cd9660_write_rr(iso9660_disk *, FILE *, cd9660node *, off_t, off_t);
55
56 /*
57 * Write the image
58 * Writes the entire image
59 * @param const char* The filename for the image
60 * @returns int 1 on success, 0 on failure
61 */
62 int
cd9660_write_image(iso9660_disk * diskStructure,const char * image)63 cd9660_write_image(iso9660_disk *diskStructure, const char* image)
64 {
65 FILE *fd;
66 int status;
67 char buf[CD9660_SECTOR_SIZE];
68
69 if ((fd = fopen(image, "w+")) == NULL) {
70 err(EXIT_FAILURE, "%s: Can't open `%s' for writing", __func__,
71 image);
72 }
73
74 if (diskStructure->verbose_level > 0)
75 printf("Writing image\n");
76
77 if (diskStructure->has_generic_bootimage) {
78 status = cd9660_copy_file(diskStructure, fd, 0,
79 diskStructure->generic_bootimage);
80 if (status == 0) {
81 warnx("%s: Error writing generic boot image",
82 __func__);
83 goto cleanup_bad_image;
84 }
85 }
86
87 /* Write the volume descriptors */
88 status = cd9660_write_volume_descriptors(diskStructure, fd);
89 if (status == 0) {
90 warnx("%s: Error writing volume descriptors to image",
91 __func__);
92 goto cleanup_bad_image;
93 }
94
95 if (diskStructure->verbose_level > 0)
96 printf("Volume descriptors written\n");
97
98 /*
99 * Write the path tables: there are actually four, but right
100 * now we are only concearned with two.
101 */
102 status = cd9660_write_path_tables(diskStructure, fd);
103 if (status == 0) {
104 warnx("%s: Error writing path tables to image", __func__);
105 goto cleanup_bad_image;
106 }
107
108 if (diskStructure->verbose_level > 0)
109 printf("Path tables written\n");
110
111 /* Write the directories and files */
112 status = cd9660_write_file(diskStructure, fd, diskStructure->rootNode);
113 if (status == 0) {
114 warnx("%s: Error writing files to image", __func__);
115 goto cleanup_bad_image;
116 }
117
118 if (diskStructure->is_bootable) {
119 cd9660_write_boot(diskStructure, fd);
120 }
121
122 /* Write padding bits. This is temporary */
123 memset(buf, 0, CD9660_SECTOR_SIZE);
124 cd9660_write_filedata(diskStructure, fd,
125 diskStructure->totalSectors - 1, buf, 1);
126
127 if (diskStructure->verbose_level > 0)
128 printf("Files written\n");
129 fclose(fd);
130
131 if (diskStructure->verbose_level > 0)
132 printf("Image closed\n");
133 return 1;
134
135 cleanup_bad_image:
136 fclose(fd);
137 if (!diskStructure->keep_bad_images)
138 unlink(image);
139 if (diskStructure->verbose_level > 0)
140 printf("Bad image cleaned up\n");
141 return 0;
142 }
143
144 static int
cd9660_write_volume_descriptors(iso9660_disk * diskStructure,FILE * fd)145 cd9660_write_volume_descriptors(iso9660_disk *diskStructure, FILE *fd)
146 {
147 volume_descriptor *vd_temp = diskStructure->firstVolumeDescriptor;
148
149 while (vd_temp != NULL) {
150 cd9660_write_filedata(diskStructure, fd, vd_temp->sector,
151 vd_temp->volumeDescriptorData, 1);
152 vd_temp = vd_temp->next;
153 }
154 return 1;
155 }
156
157 /*
158 * Write out an individual path table
159 * Used just to keep redundant code to a minimum
160 * @param FILE *fd Valid file pointer
161 * @param int Sector to start writing path table to
162 * @param int Endian mode : BIG_ENDIAN or LITTLE_ENDIAN
163 * @returns int 1 on success, 0 on failure
164 */
165 static int
cd9660_write_path_table(iso9660_disk * diskStructure,FILE * fd,off_t sector,int mode)166 cd9660_write_path_table(iso9660_disk *diskStructure, FILE *fd, off_t sector,
167 int mode)
168 {
169 int path_table_sectors = CD9660_BLOCKS(diskStructure->sectorSize,
170 diskStructure->pathTableLength);
171 unsigned char *buffer;
172 unsigned char *buffer_head;
173 int len, ret;
174 path_table_entry temp_entry;
175 cd9660node *ptcur;
176
177 buffer = ecalloc(path_table_sectors, diskStructure->sectorSize);
178 buffer_head = buffer;
179
180 ptcur = diskStructure->rootNode;
181
182 while (ptcur != NULL) {
183 memset(&temp_entry, 0, sizeof(path_table_entry));
184 temp_entry.length[0] = ptcur->isoDirRecord->name_len[0];
185 temp_entry.extended_attribute_length[0] =
186 ptcur->isoDirRecord->ext_attr_length[0];
187 memcpy(temp_entry.name, ptcur->isoDirRecord->name,
188 temp_entry.length[0] + 1);
189
190 /* round up */
191 len = temp_entry.length[0] + 8 + (temp_entry.length[0] & 0x01);
192
193 /* todo: function pointers instead */
194 if (mode == LITTLE_ENDIAN) {
195 cd9660_731(ptcur->fileDataSector,
196 temp_entry.first_sector);
197 cd9660_721((ptcur->parent == NULL ?
198 1 : ptcur->parent->ptnumber),
199 temp_entry.parent_number);
200 } else {
201 cd9660_732(ptcur->fileDataSector,
202 temp_entry.first_sector);
203 cd9660_722((ptcur->parent == NULL ?
204 1 : ptcur->parent->ptnumber),
205 temp_entry.parent_number);
206 }
207
208
209 memcpy(buffer, &temp_entry, len);
210 buffer += len;
211
212 ptcur = ptcur->ptnext;
213 }
214
215 ret = cd9660_write_filedata(diskStructure, fd, sector, buffer_head,
216 path_table_sectors);
217 free(buffer_head);
218 return ret;
219 }
220
221
222 /*
223 * Write out the path tables to disk
224 * Each file descriptor should be pointed to by the PVD, so we know which
225 * sector to copy them to. One thing to watch out for: the only path tables
226 * stored are in the endian mode that the application is compiled for. So,
227 * the first thing to do is write out that path table, then to write the one
228 * in the other endian mode requires to convert the endianness of each entry
229 * in the table. The best way to do this would be to create a temporary
230 * path_table_entry structure, then for each path table entry, copy it to
231 * the temporary entry, translate, then copy that to disk.
232 *
233 * @param FILE* Valid file descriptor
234 * @returns int 0 on failure, 1 on success
235 */
236 static int
cd9660_write_path_tables(iso9660_disk * diskStructure,FILE * fd)237 cd9660_write_path_tables(iso9660_disk *diskStructure, FILE *fd)
238 {
239 if (cd9660_write_path_table(diskStructure, fd,
240 diskStructure->primaryLittleEndianTableSector, LITTLE_ENDIAN) == 0)
241 return 0;
242
243 if (cd9660_write_path_table(diskStructure, fd,
244 diskStructure->primaryBigEndianTableSector, BIG_ENDIAN) == 0)
245 return 0;
246
247 /* @TODO: handle remaining two path tables */
248 return 1;
249 }
250
251 /*
252 * Write a file to disk
253 * Writes a file, its directory record, and its data to disk
254 * This file is designed to be called RECURSIVELY, so initially call it
255 * with the root node. All of the records should store what sector the
256 * file goes in, so no computation should be necessary.
257 *
258 * @param int fd Valid file descriptor
259 * @param struct cd9660node* writenode Pointer to the file to be written
260 * @returns int 0 on failure, 1 on success
261 */
262 static int
cd9660_write_file(iso9660_disk * diskStructure,FILE * fd,cd9660node * writenode)263 cd9660_write_file(iso9660_disk *diskStructure, FILE *fd, cd9660node *writenode)
264 {
265 char *buf;
266 char *temp_file_name;
267 int ret;
268 off_t working_sector;
269 int cur_sector_offset;
270 iso_directory_record_cd9660 temp_record;
271 cd9660node *temp;
272 int rv = 0;
273
274 /* Todo : clean up variables */
275
276 temp_file_name = ecalloc(CD9660MAXPATH + 1, 1);
277 buf = emalloc(diskStructure->sectorSize);
278 if ((writenode->level != 0) &&
279 !(writenode->node->type & S_IFDIR)) {
280 fsinode *inode = writenode->node->inode;
281 /* Only attempt to write unwritten files that have length. */
282 if ((inode->flags & FI_WRITTEN) != 0) {
283 INODE_WARNX(("%s: skipping written inode %d", __func__,
284 (int)inode->st.st_ino));
285 } else if (writenode->fileDataLength > 0) {
286 INODE_WARNX(("%s: writing inode %d blocks at %" PRIu32,
287 __func__, (int)inode->st.st_ino, inode->ino));
288 inode->flags |= FI_WRITTEN;
289 if (writenode->node->contents == NULL)
290 cd9660_compute_full_filename(writenode,
291 temp_file_name);
292 ret = cd9660_copy_file(diskStructure, fd,
293 writenode->fileDataSector,
294 (writenode->node->contents != NULL) ?
295 writenode->node->contents : temp_file_name);
296 if (ret == 0)
297 goto out;
298 }
299 } else {
300 /*
301 * Here is a new revelation that ECMA didn't explain
302 * (at least not well).
303 * ALL . and .. records store the name "\0" and "\1"
304 * respectively. So, for each directory, we have to
305 * make a new node.
306 *
307 * This is where it gets kinda messy, since we have to
308 * be careful of sector boundaries
309 */
310 cur_sector_offset = 0;
311 working_sector = writenode->fileDataSector;
312 if (fseeko(fd, working_sector * diskStructure->sectorSize,
313 SEEK_SET) == -1)
314 err(1, "fseeko");
315
316 /*
317 * Now loop over children, writing out their directory
318 * records - beware of sector boundaries
319 */
320 TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) {
321 /*
322 * Copy the temporary record and adjust its size
323 * if necessary
324 */
325 memcpy(&temp_record, temp->isoDirRecord,
326 sizeof(iso_directory_record_cd9660));
327
328 temp_record.length[0] =
329 cd9660_compute_record_size(diskStructure, temp);
330
331 if (temp_record.length[0] + cur_sector_offset >=
332 diskStructure->sectorSize) {
333 cur_sector_offset = 0;
334 working_sector++;
335
336 /* Seek to the next sector. */
337 if (fseeko(fd, working_sector *
338 diskStructure->sectorSize, SEEK_SET) == -1)
339 err(1, "fseeko");
340 }
341 /* Write out the basic ISO directory record */
342 (void)fwrite(&temp_record, 1,
343 temp->isoDirRecord->length[0], fd);
344 if (diskStructure->rock_ridge_enabled) {
345 cd9660_write_rr(diskStructure, fd, temp,
346 cur_sector_offset, working_sector);
347 }
348 if (fseeko(fd, working_sector *
349 diskStructure->sectorSize + cur_sector_offset +
350 temp_record.length[0] - temp->su_tail_size,
351 SEEK_SET) == -1)
352 err(1, "fseeko");
353 if (temp->su_tail_size > 0)
354 fwrite(temp->su_tail_data, 1,
355 temp->su_tail_size, fd);
356 if (ferror(fd)) {
357 warnx("%s: write error", __func__);
358 goto out;
359 }
360 cur_sector_offset += temp_record.length[0];
361
362 }
363
364 /*
365 * Recurse on children.
366 */
367 TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) {
368 if ((ret = cd9660_write_file(diskStructure, fd, temp)) == 0)
369 goto out;
370 }
371 }
372 rv = 1;
373 out:
374 free(temp_file_name);
375 free(buf);
376 return rv;
377 }
378
379 /*
380 * Wrapper function to write a buffer (one sector) to disk.
381 * Seeks and writes the buffer.
382 * NOTE: You dont NEED to use this function, but it might make your
383 * life easier if you have to write things that align to a sector
384 * (such as volume descriptors).
385 *
386 * @param int fd Valid file descriptor
387 * @param int sector Sector number to write to
388 * @param const unsigned char* Buffer to write. This should be the
389 * size of a sector, and if only a portion
390 * is written, the rest should be set to 0.
391 */
392 static int
cd9660_write_filedata(iso9660_disk * diskStructure,FILE * fd,off_t sector,const unsigned char * buf,int numsecs)393 cd9660_write_filedata(iso9660_disk *diskStructure, FILE *fd, off_t sector,
394 const unsigned char *buf, int numsecs)
395 {
396 off_t curpos;
397 size_t success;
398
399 curpos = ftello(fd);
400
401 if (fseeko(fd, sector * diskStructure->sectorSize, SEEK_SET) == -1)
402 err(1, "fseeko");
403
404 success = fwrite(buf, diskStructure->sectorSize * numsecs, 1, fd);
405
406 if (fseeko(fd, curpos, SEEK_SET) == -1)
407 err(1, "fseeko");
408
409 if (success == 1)
410 success = diskStructure->sectorSize * numsecs;
411 return success;
412 }
413
414 #if 0
415 static int
416 cd9660_write_buffered(FILE *fd, off_t offset, int buff_len,
417 const unsigned char* buffer)
418 {
419 static int working_sector = -1;
420 static char buf[CD9660_SECTOR_SIZE];
421
422 return 0;
423 }
424 #endif
425
426 int
cd9660_copy_file(iso9660_disk * diskStructure,FILE * fd,off_t start_sector,const char * filename)427 cd9660_copy_file(iso9660_disk *diskStructure, FILE *fd, off_t start_sector,
428 const char *filename)
429 {
430 FILE *rf;
431 int bytes_read;
432 off_t sector = start_sector;
433 int buf_size = diskStructure->sectorSize;
434 char *buf;
435
436 buf = emalloc(buf_size);
437 if ((rf = fopen(filename, "rb")) == NULL) {
438 warn("%s: cannot open %s", __func__, filename);
439 free(buf);
440 return 0;
441 }
442
443 if (diskStructure->verbose_level > 1)
444 printf("Writing file: %s\n",filename);
445
446 if (fseeko(fd, start_sector * diskStructure->sectorSize, SEEK_SET) == -1)
447 err(1, "fseeko");
448
449 while (!feof(rf)) {
450 bytes_read = fread(buf,1,buf_size,rf);
451 if (ferror(rf)) {
452 warn("%s: fread", __func__);
453 free(buf);
454 (void)fclose(rf);
455 return 0;
456 }
457
458 fwrite(buf,1,bytes_read,fd);
459 if (ferror(fd)) {
460 warn("%s: fwrite", __func__);
461 free(buf);
462 (void)fclose(rf);
463 return 0;
464 }
465 sector++;
466 }
467
468 fclose(rf);
469 free(buf);
470 return 1;
471 }
472
473 static void
cd9660_write_rr(iso9660_disk * diskStructure,FILE * fd,cd9660node * writenode,off_t offset,off_t sector)474 cd9660_write_rr(iso9660_disk *diskStructure, FILE *fd, cd9660node *writenode,
475 off_t offset, off_t sector)
476 {
477 int in_ca = 0;
478 struct ISO_SUSP_ATTRIBUTES *myattr;
479
480 offset += writenode->isoDirRecord->length[0];
481 if (fseeko(fd, sector * diskStructure->sectorSize + offset, SEEK_SET) ==
482 -1)
483 err(1, "fseeko");
484 /* Offset now points at the end of the record */
485 TAILQ_FOREACH(myattr, &writenode->head, rr_ll) {
486 fwrite(&(myattr->attr), CD9660_SUSP_ENTRY_SIZE(myattr), 1, fd);
487
488 if (!in_ca) {
489 offset += CD9660_SUSP_ENTRY_SIZE(myattr);
490 if (myattr->last_in_suf) {
491 /*
492 * Point the offset to the start of this
493 * record's CE area
494 */
495 if (fseeko(fd, ((off_t)diskStructure->
496 susp_continuation_area_start_sector *
497 diskStructure->sectorSize)
498 + writenode->susp_entry_ce_start,
499 SEEK_SET) == -1)
500 err(1, "fseeko");
501 in_ca = 1;
502 }
503 }
504 }
505
506 /*
507 * If we had to go to the continuation area, head back to
508 * where we should be.
509 */
510 if (in_ca)
511 if (fseeko(fd, sector * diskStructure->sectorSize + offset,
512 SEEK_SET) == -1)
513 err(1, "fseeko");
514 }
515