1 /* $NetBSD: cd9660_write.c,v 1.14 2011/01/04 09:48:21 wiz Exp $ */ 2 3 /* 4 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan 5 * Perez-Rathke and Ram Vedam. All rights reserved. 6 * 7 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys, 8 * Alan Perez-Rathke and Ram Vedam. 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer in the documentation and/or other materials provided 18 * with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN 21 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 24 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN 25 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 28 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 29 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 32 * OF SUCH DAMAGE. 33 */ 34 35 #include "cd9660.h" 36 #include "iso9660_rrip.h" 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 static int cd9660_write_volume_descriptors(FILE *); 42 static int cd9660_write_path_table(FILE *, off_t, int); 43 static int cd9660_write_path_tables(FILE *); 44 static int cd9660_write_file(FILE *, cd9660node *); 45 static int cd9660_write_filedata(FILE *, off_t, const unsigned char *, int); 46 #if 0 47 static int cd9660_write_buffered(FILE *, off_t, int, const unsigned char *); 48 #endif 49 static void cd9660_write_rr(FILE *, cd9660node *, off_t, off_t); 50 51 /* 52 * Write the image 53 * Writes the entire image 54 * @param const char* The filename for the image 55 * @returns int 1 on success, 0 on failure 56 */ 57 int 58 cd9660_write_image(const char* image) 59 { 60 FILE *fd; 61 int status; 62 char buf[CD9660_SECTOR_SIZE]; 63 64 if ((fd = fopen(image, "w+")) == NULL) { 65 err(EXIT_FAILURE, "%s: Can't open `%s' for writing", __func__, 66 image); 67 } 68 69 if (diskStructure.verbose_level > 0) 70 printf("Writing image\n"); 71 72 if (diskStructure.has_generic_bootimage) { 73 status = cd9660_copy_file(fd, 0, 74 diskStructure.generic_bootimage); 75 if (status == 0) { 76 warnx("%s: Error writing generic boot image", 77 __func__); 78 goto cleanup_bad_image; 79 } 80 } 81 82 /* Write the volume descriptors */ 83 status = cd9660_write_volume_descriptors(fd); 84 if (status == 0) { 85 warnx("%s: Error writing volume descriptors to image", 86 __func__); 87 goto cleanup_bad_image; 88 } 89 90 if (diskStructure.verbose_level > 0) 91 printf("Volume descriptors written\n"); 92 93 /* 94 * Write the path tables: there are actually four, but right 95 * now we are only concearned with two. 96 */ 97 status = cd9660_write_path_tables(fd); 98 if (status == 0) { 99 warnx("%s: Error writing path tables to image", __func__); 100 goto cleanup_bad_image; 101 } 102 103 if (diskStructure.verbose_level > 0) 104 printf("Path tables written\n"); 105 106 /* Write the directories and files */ 107 status = cd9660_write_file(fd, diskStructure.rootNode); 108 if (status == 0) { 109 warnx("%s: Error writing files to image", __func__); 110 goto cleanup_bad_image; 111 } 112 113 if (diskStructure.is_bootable) { 114 cd9660_write_boot(fd); 115 } 116 117 /* Write padding bits. This is temporary */ 118 memset(buf, 0, CD9660_SECTOR_SIZE); 119 cd9660_write_filedata(fd, diskStructure.totalSectors - 1, buf, 1); 120 121 if (diskStructure.verbose_level > 0) 122 printf("Files written\n"); 123 fclose(fd); 124 125 if (diskStructure.verbose_level > 0) 126 printf("Image closed\n"); 127 return 1; 128 129 cleanup_bad_image: 130 fclose(fd); 131 if (!diskStructure.keep_bad_images) 132 unlink(image); 133 if (diskStructure.verbose_level > 0) 134 printf("Bad image cleaned up\n"); 135 return 0; 136 } 137 138 static int 139 cd9660_write_volume_descriptors(FILE *fd) 140 { 141 volume_descriptor *vd_temp = diskStructure.firstVolumeDescriptor; 142 int pos; 143 144 while (vd_temp != NULL) { 145 pos = vd_temp->sector * diskStructure.sectorSize; 146 cd9660_write_filedata(fd, vd_temp->sector, 147 vd_temp->volumeDescriptorData, 1); 148 vd_temp = vd_temp->next; 149 } 150 return 1; 151 } 152 153 /* 154 * Write out an individual path table 155 * Used just to keep redundant code to a minimum 156 * @param FILE *fd Valid file pointer 157 * @param int Sector to start writing path table to 158 * @param int Endian mode : BIG_ENDIAN or LITTLE_ENDIAN 159 * @returns int 1 on success, 0 on failure 160 */ 161 static int 162 cd9660_write_path_table(FILE *fd, off_t sector, int mode) 163 { 164 int path_table_sectors = CD9660_BLOCKS(diskStructure.sectorSize, 165 diskStructure.pathTableLength); 166 unsigned char *buffer; 167 unsigned char *buffer_head; 168 int len, ret; 169 path_table_entry temp_entry; 170 cd9660node *ptcur; 171 172 buffer = malloc(diskStructure.sectorSize * path_table_sectors); 173 if (buffer == NULL) { 174 warnx("%s: Memory allocation error allocating buffer", 175 __func__); 176 return 0; 177 } 178 buffer_head = buffer; 179 memset(buffer, 0, diskStructure.sectorSize * path_table_sectors); 180 181 ptcur = diskStructure.rootNode; 182 183 while (ptcur != NULL) { 184 memset(&temp_entry, 0, sizeof(path_table_entry)); 185 temp_entry.length[0] = ptcur->isoDirRecord->name_len[0]; 186 temp_entry.extended_attribute_length[0] = 187 ptcur->isoDirRecord->ext_attr_length[0]; 188 memcpy(temp_entry.name, ptcur->isoDirRecord->name, 189 temp_entry.length[0] + 1); 190 191 /* round up */ 192 len = temp_entry.length[0] + 8 + (temp_entry.length[0] & 0x01); 193 194 /* todo: function pointers instead */ 195 if (mode == LITTLE_ENDIAN) { 196 cd9660_731(ptcur->fileDataSector, 197 temp_entry.first_sector); 198 cd9660_721((ptcur->parent == NULL ? 199 1 : ptcur->parent->ptnumber), 200 temp_entry.parent_number); 201 } else { 202 cd9660_732(ptcur->fileDataSector, 203 temp_entry.first_sector); 204 cd9660_722((ptcur->parent == NULL ? 205 1 : ptcur->parent->ptnumber), 206 temp_entry.parent_number); 207 } 208 209 210 memcpy(buffer, &temp_entry, len); 211 buffer += len; 212 213 ptcur = ptcur->ptnext; 214 } 215 216 ret = cd9660_write_filedata(fd, sector, buffer_head, 217 path_table_sectors); 218 free(buffer_head); 219 return ret; 220 } 221 222 223 /* 224 * Write out the path tables to disk 225 * Each file descriptor should be pointed to by the PVD, so we know which 226 * sector to copy them to. One thing to watch out for: the only path tables 227 * stored are in the endian mode that the application is compiled for. So, 228 * the first thing to do is write out that path table, then to write the one 229 * in the other endian mode requires to convert the endianness of each entry 230 * in the table. The best way to do this would be to create a temporary 231 * path_table_entry structure, then for each path table entry, copy it to 232 * the temporary entry, translate, then copy that to disk. 233 * 234 * @param FILE* Valid file descriptor 235 * @returns int 0 on failure, 1 on success 236 */ 237 static int 238 cd9660_write_path_tables(FILE *fd) 239 { 240 if (cd9660_write_path_table(fd, 241 diskStructure.primaryLittleEndianTableSector, LITTLE_ENDIAN) == 0) 242 return 0; 243 244 if (cd9660_write_path_table(fd, 245 diskStructure.primaryBigEndianTableSector, BIG_ENDIAN) == 0) 246 return 0; 247 248 /* @TODO: handle remaining two path tables */ 249 return 1; 250 } 251 252 /* 253 * Write a file to disk 254 * Writes a file, its directory record, and its data to disk 255 * This file is designed to be called RECURSIVELY, so initially call it 256 * with the root node. All of the records should store what sector the 257 * file goes in, so no computation should be necessary. 258 * 259 * @param int fd Valid file descriptor 260 * @param struct cd9660node* writenode Pointer to the file to be written 261 * @returns int 0 on failure, 1 on success 262 */ 263 static int 264 cd9660_write_file(FILE *fd, cd9660node *writenode) 265 { 266 char *buf; 267 char *temp_file_name; 268 int ret; 269 off_t working_sector; 270 int cur_sector_offset; 271 int written; 272 iso_directory_record_cd9660 temp_record; 273 cd9660node *temp; 274 int rv = 0; 275 276 /* Todo : clean up variables */ 277 278 temp_file_name = malloc(CD9660MAXPATH + 1); 279 if (temp_file_name == NULL) 280 err(EXIT_FAILURE, "%s: malloc", __func__); 281 282 memset(temp_file_name, 0, CD9660MAXPATH + 1); 283 284 buf = malloc(diskStructure.sectorSize); 285 if (buf == NULL) 286 err(EXIT_FAILURE, "%s: malloc", __func__); 287 288 if ((writenode->level != 0) && 289 !(writenode->node->type & S_IFDIR)) { 290 fsinode *inode = writenode->node->inode; 291 /* Only attempt to write unwritten files that have length. */ 292 if ((inode->flags & FI_WRITTEN) != 0) { 293 INODE_WARNX(("%s: skipping written inode %d", __func__, 294 (int)inode->st.st_ino)); 295 } else if (writenode->fileDataLength > 0) { 296 INODE_WARNX(("%s: writing inode %d blocks at %" PRIu32, 297 __func__, (int)inode->st.st_ino, inode->ino)); 298 inode->flags |= FI_WRITTEN; 299 if (writenode->node->contents == NULL) 300 cd9660_compute_full_filename(writenode, 301 temp_file_name); 302 ret = cd9660_copy_file(fd, writenode->fileDataSector, 303 (writenode->node->contents != NULL) ? 304 writenode->node->contents : temp_file_name); 305 if (ret == 0) 306 goto out; 307 } 308 } else { 309 /* 310 * Here is a new revelation that ECMA didn't explain 311 * (at least not well). 312 * ALL . and .. records store the name "\0" and "\1" 313 * respectively. So, for each directory, we have to 314 * make a new node. 315 * 316 * This is where it gets kinda messy, since we have to 317 * be careful of sector boundaries 318 */ 319 cur_sector_offset = 0; 320 working_sector = writenode->fileDataSector; 321 if (fseeko(fd, working_sector * diskStructure.sectorSize, 322 SEEK_SET) == -1) 323 err(1, "fseeko"); 324 325 /* 326 * Now loop over children, writing out their directory 327 * records - beware of sector boundaries 328 */ 329 TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) { 330 /* 331 * Copy the temporary record and adjust its size 332 * if necessary 333 */ 334 memcpy(&temp_record, temp->isoDirRecord, 335 sizeof(iso_directory_record_cd9660)); 336 337 temp_record.length[0] = 338 cd9660_compute_record_size(temp); 339 340 if (temp_record.length[0] + cur_sector_offset >= 341 diskStructure.sectorSize) { 342 cur_sector_offset = 0; 343 working_sector++; 344 345 /* Seek to the next sector. */ 346 if (fseeko(fd, working_sector * 347 diskStructure.sectorSize, SEEK_SET) == -1) 348 err(1, "fseeko"); 349 } 350 /* Write out the basic ISO directory record */ 351 written = fwrite(&temp_record, 1, 352 temp->isoDirRecord->length[0], fd); 353 if (diskStructure.rock_ridge_enabled) { 354 cd9660_write_rr(fd, temp, 355 cur_sector_offset, working_sector); 356 } 357 if (fseeko(fd, working_sector * 358 diskStructure.sectorSize + cur_sector_offset + 359 temp_record.length[0] - temp->su_tail_size, 360 SEEK_SET) == -1) 361 err(1, "fseeko"); 362 if (temp->su_tail_size > 0) 363 fwrite(temp->su_tail_data, 1, 364 temp->su_tail_size, fd); 365 if (ferror(fd)) { 366 warnx("%s: write error", __func__); 367 goto out; 368 } 369 cur_sector_offset += temp_record.length[0]; 370 371 } 372 373 /* 374 * Recurse on children. 375 */ 376 TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) { 377 if ((ret = cd9660_write_file(fd, temp)) == 0) 378 goto out; 379 } 380 } 381 rv = 1; 382 out: 383 free(temp_file_name); 384 free(buf); 385 return rv; 386 } 387 388 /* 389 * Wrapper function to write a buffer (one sector) to disk. 390 * Seeks and writes the buffer. 391 * NOTE: You dont NEED to use this function, but it might make your 392 * life easier if you have to write things that align to a sector 393 * (such as volume descriptors). 394 * 395 * @param int fd Valid file descriptor 396 * @param int sector Sector number to write to 397 * @param const unsigned char* Buffer to write. This should be the 398 * size of a sector, and if only a portion 399 * is written, the rest should be set to 0. 400 */ 401 static int 402 cd9660_write_filedata(FILE *fd, off_t sector, const unsigned char *buf, 403 int numsecs) 404 { 405 off_t curpos; 406 size_t success; 407 408 curpos = ftello(fd); 409 410 if (fseeko(fd, sector * diskStructure.sectorSize, SEEK_SET) == -1) 411 err(1, "fseeko"); 412 413 success = fwrite(buf, diskStructure.sectorSize * numsecs, 1, fd); 414 415 if (fseeko(fd, curpos, SEEK_SET) == -1) 416 err(1, "fseeko"); 417 418 if (success == 1) 419 success = diskStructure.sectorSize * numsecs; 420 return success; 421 } 422 423 #if 0 424 static int 425 cd9660_write_buffered(FILE *fd, off_t offset, int buff_len, 426 const unsigned char* buffer) 427 { 428 static int working_sector = -1; 429 static char buf[CD9660_SECTOR_SIZE]; 430 431 return 0; 432 } 433 #endif 434 435 int 436 cd9660_copy_file(FILE *fd, off_t start_sector, const char *filename) 437 { 438 FILE *rf; 439 int bytes_read; 440 off_t sector = start_sector; 441 int buf_size = diskStructure.sectorSize; 442 char *buf; 443 444 buf = malloc(buf_size); 445 if (buf == NULL) 446 err(EXIT_FAILURE, "%s: malloc", __func__); 447 448 if ((rf = fopen(filename, "rb")) == NULL) { 449 warn("%s: cannot open %s", __func__, filename); 450 free(buf); 451 return 0; 452 } 453 454 if (diskStructure.verbose_level > 1) 455 printf("Writing file: %s\n",filename); 456 457 if (fseeko(fd, start_sector * diskStructure.sectorSize, SEEK_SET) == -1) 458 err(1, "fseeko"); 459 460 while (!feof(rf)) { 461 bytes_read = fread(buf,1,buf_size,rf); 462 if (ferror(rf)) { 463 warn("%s: fread", __func__); 464 free(buf); 465 (void)fclose(rf); 466 return 0; 467 } 468 469 fwrite(buf,1,bytes_read,fd); 470 if (ferror(fd)) { 471 warn("%s: fwrite", __func__); 472 free(buf); 473 (void)fclose(rf); 474 return 0; 475 } 476 sector++; 477 } 478 479 fclose(rf); 480 free(buf); 481 return 1; 482 } 483 484 static void 485 cd9660_write_rr(FILE *fd, cd9660node *writenode, off_t offset, off_t sector) 486 { 487 int in_ca = 0; 488 struct ISO_SUSP_ATTRIBUTES *myattr; 489 490 offset += writenode->isoDirRecord->length[0]; 491 if (fseeko(fd, sector * diskStructure.sectorSize + offset, SEEK_SET) == 492 -1) 493 err(1, "fseeko"); 494 /* Offset now points at the end of the record */ 495 TAILQ_FOREACH(myattr, &writenode->head, rr_ll) { 496 fwrite(&(myattr->attr), CD9660_SUSP_ENTRY_SIZE(myattr), 1, fd); 497 498 if (!in_ca) { 499 offset += CD9660_SUSP_ENTRY_SIZE(myattr); 500 if (myattr->last_in_suf) { 501 /* 502 * Point the offset to the start of this 503 * record's CE area 504 */ 505 if (fseeko(fd, ((off_t)diskStructure. 506 susp_continuation_area_start_sector * 507 diskStructure.sectorSize) 508 + writenode->susp_entry_ce_start, 509 SEEK_SET) == -1) 510 err(1, "fseeko"); 511 in_ca = 1; 512 } 513 } 514 } 515 516 /* 517 * If we had to go to the continuation area, head back to 518 * where we should be. 519 */ 520 if (in_ca) 521 if (fseeko(fd, sector * diskStructure.sectorSize + offset, 522 SEEK_SET) == -1) 523 err(1, "fseeko"); 524 } 525