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