1 /* $NetBSD: cd9660_write.c,v 1.16 2013/01/28 21:03:28 christos 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 #if defined(__RCSID) && !defined(__lint) 40 __RCSID("$NetBSD: cd9660_write.c,v 1.16 2013/01/28 21:03:28 christos Exp $"); 41 #endif /* !__lint */ 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 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 145 cd9660_write_volume_descriptors(iso9660_disk *diskStructure, FILE *fd) 146 { 147 volume_descriptor *vd_temp = diskStructure->firstVolumeDescriptor; 148 int pos; 149 150 while (vd_temp != NULL) { 151 pos = vd_temp->sector * diskStructure->sectorSize; 152 cd9660_write_filedata(diskStructure, fd, vd_temp->sector, 153 vd_temp->volumeDescriptorData, 1); 154 vd_temp = vd_temp->next; 155 } 156 return 1; 157 } 158 159 /* 160 * Write out an individual path table 161 * Used just to keep redundant code to a minimum 162 * @param FILE *fd Valid file pointer 163 * @param int Sector to start writing path table to 164 * @param int Endian mode : BIG_ENDIAN or LITTLE_ENDIAN 165 * @returns int 1 on success, 0 on failure 166 */ 167 static int 168 cd9660_write_path_table(iso9660_disk *diskStructure, FILE *fd, off_t sector, 169 int mode) 170 { 171 int path_table_sectors = CD9660_BLOCKS(diskStructure->sectorSize, 172 diskStructure->pathTableLength); 173 unsigned char *buffer; 174 unsigned char *buffer_head; 175 int len; 176 path_table_entry temp_entry; 177 cd9660node *ptcur; 178 179 buffer = ecalloc(path_table_sectors, diskStructure->sectorSize); 180 buffer_head = buffer; 181 182 ptcur = diskStructure->rootNode; 183 184 while (ptcur != NULL) { 185 memset(&temp_entry, 0, sizeof(path_table_entry)); 186 temp_entry.length[0] = ptcur->isoDirRecord->name_len[0]; 187 temp_entry.extended_attribute_length[0] = 188 ptcur->isoDirRecord->ext_attr_length[0]; 189 memcpy(temp_entry.name, ptcur->isoDirRecord->name, 190 temp_entry.length[0] + 1); 191 192 /* round up */ 193 len = temp_entry.length[0] + 8 + (temp_entry.length[0] & 0x01); 194 195 /* todo: function pointers instead */ 196 if (mode == LITTLE_ENDIAN) { 197 cd9660_731(ptcur->fileDataSector, 198 temp_entry.first_sector); 199 cd9660_721((ptcur->parent == NULL ? 200 1 : ptcur->parent->ptnumber), 201 temp_entry.parent_number); 202 } else { 203 cd9660_732(ptcur->fileDataSector, 204 temp_entry.first_sector); 205 cd9660_722((ptcur->parent == NULL ? 206 1 : ptcur->parent->ptnumber), 207 temp_entry.parent_number); 208 } 209 210 211 memcpy(buffer, &temp_entry, len); 212 buffer += len; 213 214 ptcur = ptcur->ptnext; 215 } 216 217 return cd9660_write_filedata(diskStructure, fd, sector, buffer_head, 218 path_table_sectors); 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 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 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 int written; 271 iso_directory_record_cd9660 temp_record; 272 cd9660node *temp; 273 int rv = 0; 274 275 /* Todo : clean up variables */ 276 277 temp_file_name = ecalloc(CD9660MAXPATH + 1, 1); 278 buf = emalloc(diskStructure->sectorSize); 279 if ((writenode->level != 0) && 280 !(writenode->node->type & S_IFDIR)) { 281 fsinode *inode = writenode->node->inode; 282 /* Only attempt to write unwritten files that have length. */ 283 if ((inode->flags & FI_WRITTEN) != 0) { 284 INODE_WARNX(("%s: skipping written inode %d", __func__, 285 (int)inode->st.st_ino)); 286 } else if (writenode->fileDataLength > 0) { 287 INODE_WARNX(("%s: writing inode %d blocks at %" PRIu32, 288 __func__, (int)inode->st.st_ino, inode->ino)); 289 inode->flags |= FI_WRITTEN; 290 cd9660_compute_full_filename(writenode, 291 temp_file_name); 292 ret = cd9660_copy_file(diskStructure, fd, 293 writenode->fileDataSector, temp_file_name); 294 if (ret == 0) 295 goto out; 296 } 297 } else { 298 /* 299 * Here is a new revelation that ECMA didnt explain 300 * (at least not well). 301 * ALL . and .. records store the name "\0" and "\1" 302 * resepctively. 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 written = 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)) 367 == 0) 368 goto out; 369 } 370 } 371 rv = 1; 372 out: 373 free(temp_file_name); 374 free(buf); 375 return rv; 376 } 377 378 /* 379 * Wrapper function to write a buffer (one sector) to disk. 380 * Seeks and writes the buffer. 381 * NOTE: You dont NEED to use this function, but it might make your 382 * life easier if you have to write things that align to a sector 383 * (such as volume descriptors). 384 * 385 * @param int fd Valid file descriptor 386 * @param int sector Sector number to write to 387 * @param const unsigned char* Buffer to write. This should be the 388 * size of a sector, and if only a portion 389 * is written, the rest should be set to 0. 390 */ 391 static int 392 cd9660_write_filedata(iso9660_disk *diskStructure, FILE *fd, off_t sector, 393 const unsigned char *buf, int numsecs) 394 { 395 off_t curpos; 396 size_t success; 397 398 curpos = ftello(fd); 399 400 if (fseeko(fd, sector * diskStructure->sectorSize, SEEK_SET) == -1) 401 err(1, "fseeko"); 402 403 success = fwrite(buf, diskStructure->sectorSize * numsecs, 1, fd); 404 405 if (fseeko(fd, curpos, SEEK_SET) == -1) 406 err(1, "fseeko"); 407 408 if (success == 1) 409 success = diskStructure->sectorSize * numsecs; 410 return success; 411 } 412 413 #if 0 414 static int 415 cd9660_write_buffered(FILE *fd, off_t offset, int buff_len, 416 const unsigned char* buffer) 417 { 418 static int working_sector = -1; 419 static char buf[CD9660_SECTOR_SIZE]; 420 421 return 0; 422 } 423 #endif 424 425 int 426 cd9660_copy_file(iso9660_disk *diskStructure, FILE *fd, off_t start_sector, 427 const char *filename) 428 { 429 FILE *rf; 430 int bytes_read; 431 off_t sector = start_sector; 432 int buf_size = diskStructure->sectorSize; 433 char *buf; 434 435 buf = emalloc(buf_size); 436 if ((rf = fopen(filename, "rb")) == NULL) { 437 warn("%s: cannot open %s", __func__, filename); 438 free(buf); 439 return 0; 440 } 441 442 if (diskStructure->verbose_level > 1) 443 printf("Writing file: %s\n",filename); 444 445 if (fseeko(fd, start_sector * diskStructure->sectorSize, SEEK_SET) == -1) 446 err(1, "fseeko"); 447 448 while (!feof(rf)) { 449 bytes_read = fread(buf,1,buf_size,rf); 450 if (ferror(rf)) { 451 warn("%s: fread", __func__); 452 free(buf); 453 (void)fclose(rf); 454 return 0; 455 } 456 457 fwrite(buf,1,bytes_read,fd); 458 if (ferror(fd)) { 459 warn("%s: fwrite", __func__); 460 free(buf); 461 (void)fclose(rf); 462 return 0; 463 } 464 sector++; 465 } 466 467 fclose(rf); 468 free(buf); 469 return 1; 470 } 471 472 static void 473 cd9660_write_rr(iso9660_disk *diskStructure, FILE *fd, cd9660node *writenode, 474 off_t offset, off_t sector) 475 { 476 int in_ca = 0; 477 struct ISO_SUSP_ATTRIBUTES *myattr; 478 479 offset += writenode->isoDirRecord->length[0]; 480 if (fseeko(fd, sector * diskStructure->sectorSize + offset, SEEK_SET) == 481 -1) 482 err(1, "fseeko"); 483 /* Offset now points at the end of the record */ 484 TAILQ_FOREACH(myattr, &writenode->head, rr_ll) { 485 fwrite(&(myattr->attr), CD9660_SUSP_ENTRY_SIZE(myattr), 1, fd); 486 487 if (!in_ca) { 488 offset += CD9660_SUSP_ENTRY_SIZE(myattr); 489 if (myattr->last_in_suf) { 490 /* 491 * Point the offset to the start of this 492 * record's CE area 493 */ 494 if (fseeko(fd, ((off_t)diskStructure-> 495 susp_continuation_area_start_sector * 496 diskStructure->sectorSize) 497 + writenode->susp_entry_ce_start, 498 SEEK_SET) == -1) 499 err(1, "fseeko"); 500 in_ca = 1; 501 } 502 } 503 } 504 505 /* 506 * If we had to go to the continuation area, head back to 507 * where we should be. 508 */ 509 if (in_ca) 510 if (fseeko(fd, sector * diskStructure->sectorSize + offset, 511 SEEK_SET) == -1) 512 err(1, "fseeko"); 513 } 514