1/* $OpenBSD: cd9660_write.c,v 1.9 2022/01/11 05:34:33 jsg Exp $ */ 2/* $NetBSD: cd9660_write.c,v 1.17 2013/10/19 17:16:37 christos Exp $ */ 3 4/* 5 * Copyright (c) 2005 Daniel Watt, Walter Deignan, Ryan Gabrys, Alan 6 * Perez-Rathke and Ram Vedam. All rights reserved. 7 * 8 * This code was written by Daniel Watt, Walter Deignan, Ryan Gabrys, 9 * Alan Perez-Rathke and Ram Vedam. 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer in the documentation and/or other materials provided 19 * with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY DANIEL WATT, WALTER DEIGNAN, RYAN 22 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 25 * DISCLAIMED. IN NO EVENT SHALL DANIEL WATT, WALTER DEIGNAN, RYAN 26 * GABRYS, ALAN PEREZ-RATHKE AND RAM VEDAM BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 29 * USE,DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 30 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 33 * OF SUCH DAMAGE. 34 */ 35 36#include "cd9660.h" 37#include "iso9660_rrip.h" 38 39static int cd9660_write_volume_descriptors(iso9660_disk *, FILE *); 40static int cd9660_write_path_table(iso9660_disk *, FILE *, off_t, int); 41static int cd9660_write_path_tables(iso9660_disk *, FILE *); 42static int cd9660_write_file(iso9660_disk *, FILE *, cd9660node *); 43static int cd9660_write_filedata(iso9660_disk *, FILE *, off_t, 44 const unsigned char *, int); 45#if 0 46static int cd9660_write_buffered(FILE *, off_t, int, const unsigned char *); 47#endif 48static void cd9660_write_rr(iso9660_disk *, FILE *, cd9660node *, off_t, off_t); 49 50/* 51 * Write the image 52 * Writes the entire image 53 * @param const char* The filename for the image 54 * @returns int 1 on success, 0 on failure 55 */ 56int 57cd9660_write_image(iso9660_disk *diskStructure, const char* image) 58{ 59 FILE *fd; 60 int status; 61 char buf[CD9660_SECTOR_SIZE]; 62 63 if ((fd = fopen(image, "w+")) == NULL) 64 err(1, "%s: Can't open `%s' for writing", __func__, image); 65 66 if (diskStructure->has_generic_bootimage) { 67 status = cd9660_copy_file(diskStructure, fd, 0, 68 diskStructure->generic_bootimage); 69 if (status == 0) { 70 warnx("%s: Error writing generic boot image", 71 __func__); 72 goto cleanup_bad_image; 73 } 74 } 75 76 /* Write the volume descriptors */ 77 status = cd9660_write_volume_descriptors(diskStructure, fd); 78 if (status == 0) { 79 warnx("%s: Error writing volume descriptors to image", 80 __func__); 81 goto cleanup_bad_image; 82 } 83 84 /* 85 * Write the path tables: there are actually four, but right 86 * now we are only concerned with two. 87 */ 88 status = cd9660_write_path_tables(diskStructure, fd); 89 if (status == 0) { 90 warnx("%s: Error writing path tables to image", __func__); 91 goto cleanup_bad_image; 92 } 93 94 /* Write the directories and files */ 95 status = cd9660_write_file(diskStructure, fd, diskStructure->rootNode); 96 if (status == 0) { 97 warnx("%s: Error writing files to image", __func__); 98 goto cleanup_bad_image; 99 } 100 101 if (diskStructure->is_bootable) { 102 cd9660_write_boot(diskStructure, fd); 103 } 104 105 /* Write padding bits. This is temporary */ 106 memset(buf, 0, CD9660_SECTOR_SIZE); 107 cd9660_write_filedata(diskStructure, fd, 108 diskStructure->totalSectors - 1, buf, 1); 109 110 fclose(fd); 111 return 1; 112 113cleanup_bad_image: 114 fclose(fd); 115 unlink(image); 116 return 0; 117} 118 119static int 120cd9660_write_volume_descriptors(iso9660_disk *diskStructure, FILE *fd) 121{ 122 volume_descriptor *vd_temp = diskStructure->firstVolumeDescriptor; 123 while (vd_temp != NULL) { 124 cd9660_write_filedata(diskStructure, fd, vd_temp->sector, 125 vd_temp->volumeDescriptorData, 1); 126 vd_temp = vd_temp->next; 127 } 128 return 1; 129} 130 131/* 132 * Write out an individual path table 133 * Used just to keep redundant code to a minimum 134 * @param FILE *fd Valid file pointer 135 * @param int Sector to start writing path table to 136 * @param int Endian mode : BIG_ENDIAN or LITTLE_ENDIAN 137 * @returns int 1 on success, 0 on failure 138 */ 139static int 140cd9660_write_path_table(iso9660_disk *diskStructure, FILE *fd, off_t sector, 141 int mode) 142{ 143 int path_table_sectors = CD9660_BLOCKS(diskStructure->sectorSize, 144 diskStructure->pathTableLength); 145 unsigned char *buffer; 146 unsigned char *buffer_head; 147 int len; 148 path_table_entry temp_entry; 149 cd9660node *ptcur; 150 151 buffer = ecalloc(path_table_sectors, diskStructure->sectorSize); 152 buffer_head = buffer; 153 154 ptcur = diskStructure->rootNode; 155 156 while (ptcur != NULL) { 157 memset(&temp_entry, 0, sizeof(path_table_entry)); 158 temp_entry.length[0] = ptcur->isoDirRecord->name_len[0]; 159 temp_entry.extended_attribute_length[0] = 160 ptcur->isoDirRecord->ext_attr_length[0]; 161 memcpy(temp_entry.name, ptcur->isoDirRecord->name, 162 temp_entry.length[0] + 1); 163 164 /* round up */ 165 len = temp_entry.length[0] + 8 + (temp_entry.length[0] & 0x01); 166 167 /* todo: function pointers instead */ 168 if (mode == LITTLE_ENDIAN) { 169 cd9660_731(ptcur->fileDataSector, 170 temp_entry.first_sector); 171 cd9660_721((ptcur->parent == NULL ? 172 1 : ptcur->parent->ptnumber), 173 temp_entry.parent_number); 174 } else { 175 cd9660_732(ptcur->fileDataSector, 176 temp_entry.first_sector); 177 cd9660_722((ptcur->parent == NULL ? 178 1 : ptcur->parent->ptnumber), 179 temp_entry.parent_number); 180 } 181 182 183 memcpy(buffer, &temp_entry, len); 184 buffer += len; 185 186 ptcur = ptcur->ptnext; 187 } 188 189 return cd9660_write_filedata(diskStructure, fd, sector, buffer_head, 190 path_table_sectors); 191} 192 193 194/* 195 * Write out the path tables to disk 196 * Each file descriptor should be pointed to by the PVD, so we know which 197 * sector to copy them to. One thing to watch out for: the only path tables 198 * stored are in the endian mode that the application is compiled for. So, 199 * the first thing to do is write out that path table, then to write the one 200 * in the other endian mode requires to convert the endianness of each entry 201 * in the table. The best way to do this would be to create a temporary 202 * path_table_entry structure, then for each path table entry, copy it to 203 * the temporary entry, translate, then copy that to disk. 204 * 205 * @param FILE* Valid file descriptor 206 * @returns int 0 on failure, 1 on success 207 */ 208static int 209cd9660_write_path_tables(iso9660_disk *diskStructure, FILE *fd) 210{ 211 if (cd9660_write_path_table(diskStructure, fd, 212 diskStructure->primaryLittleEndianTableSector, LITTLE_ENDIAN) == 0) 213 return 0; 214 215 if (cd9660_write_path_table(diskStructure, fd, 216 diskStructure->primaryBigEndianTableSector, BIG_ENDIAN) == 0) 217 return 0; 218 219 /* @TODO: handle remaining two path tables */ 220 return 1; 221} 222 223/* 224 * Write a file to disk 225 * Writes a file, its directory record, and its data to disk 226 * This file is designed to be called RECURSIVELY, so initially call it 227 * with the root node. All of the records should store what sector the 228 * file goes in, so no computation should be necessary. 229 * 230 * @param int fd Valid file descriptor 231 * @param struct cd9660node* writenode Pointer to the file to be written 232 * @returns int 0 on failure, 1 on success 233 */ 234static int 235cd9660_write_file(iso9660_disk *diskStructure, FILE *fd, cd9660node *writenode) 236{ 237 char *temp_file_name; 238 off_t working_sector; 239 int cur_sector_offset; 240 iso_directory_record_cd9660 temp_record; 241 cd9660node *temp; 242 243 /* Todo : clean up variables */ 244 245 if ((writenode->level != 0) && 246 !(writenode->node->type & S_IFDIR)) { 247 fsinode *inode = writenode->node->inode; 248 /* Only attempt to write unwritten files that have length. */ 249 if ((inode->flags & FI_WRITTEN) != 0) { 250 INODE_WARNX(("%s: skipping written inode %d", __func__, 251 (int)inode->st.st_ino)); 252 } else if (writenode->fileDataLength > 0) { 253 INODE_WARNX(("%s: writing inode %d blocks at %" PRIu32, 254 __func__, (int)inode->st.st_ino, inode->ino)); 255 inode->flags |= FI_WRITTEN; 256 temp_file_name = cd9660_compute_full_filename(writenode); 257 if (temp_file_name == NULL) 258 return 0; 259 if (cd9660_copy_file(diskStructure, fd, 260 writenode->fileDataSector, temp_file_name) == 0) 261 return 0; 262 } 263 } else { 264 /* 265 * Here is a new revelation that ECMA didnt explain 266 * (at least not well). 267 * ALL . and .. records store the name "\0" and "\1" 268 * respectively. So, for each directory, we have to 269 * make a new node. 270 * 271 * This is where it gets kinda messy, since we have to 272 * be careful of sector boundaries 273 */ 274 cur_sector_offset = 0; 275 working_sector = writenode->fileDataSector; 276 if (fseeko(fd, working_sector * diskStructure->sectorSize, 277 SEEK_SET) == -1) 278 err(1, "fseeko"); 279 280 /* 281 * Now loop over children, writing out their directory 282 * records - beware of sector boundaries 283 */ 284 TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) { 285 /* 286 * Copy the temporary record and adjust its size 287 * if necessary 288 */ 289 memcpy(&temp_record, temp->isoDirRecord, 290 sizeof(iso_directory_record_cd9660)); 291 292 temp_record.length[0] = 293 cd9660_compute_record_size(diskStructure, temp); 294 295 if (temp_record.length[0] + cur_sector_offset >= 296 diskStructure->sectorSize) { 297 cur_sector_offset = 0; 298 working_sector++; 299 300 /* Seek to the next sector. */ 301 if (fseeko(fd, working_sector * 302 diskStructure->sectorSize, SEEK_SET) == -1) 303 err(1, "fseeko"); 304 } 305 /* Write out the basic ISO directory record */ 306 (void)fwrite(&temp_record, 1, 307 temp->isoDirRecord->length[0], fd); 308 if (diskStructure->rock_ridge_enabled) { 309 cd9660_write_rr(diskStructure, fd, temp, 310 cur_sector_offset, working_sector); 311 } 312 if (fseeko(fd, working_sector * 313 diskStructure->sectorSize + cur_sector_offset + 314 temp_record.length[0] - temp->su_tail_size, 315 SEEK_SET) == -1) 316 err(1, "fseeko"); 317 if (temp->su_tail_size > 0) 318 fwrite(temp->su_tail_data, 1, 319 temp->su_tail_size, fd); 320 if (ferror(fd)) { 321 warnx("%s: write error", __func__); 322 return 0; 323 } 324 cur_sector_offset += temp_record.length[0]; 325 326 } 327 328 /* 329 * Recurse on children. 330 */ 331 TAILQ_FOREACH(temp, &writenode->cn_children, cn_next_child) { 332 if (cd9660_write_file(diskStructure, fd, temp) == 0) 333 return 0; 334 } 335 } 336 return 1; 337} 338 339/* 340 * Wrapper function to write a buffer (one sector) to disk. 341 * Seeks and writes the buffer. 342 * NOTE: You dont NEED to use this function, but it might make your 343 * life easier if you have to write things that align to a sector 344 * (such as volume descriptors). 345 * 346 * @param int fd Valid file descriptor 347 * @param int sector Sector number to write to 348 * @param const unsigned char* Buffer to write. This should be the 349 * size of a sector, and if only a portion 350 * is written, the rest should be set to 0. 351 */ 352static int 353cd9660_write_filedata(iso9660_disk *diskStructure, FILE *fd, off_t sector, 354 const unsigned char *buf, int numsecs) 355{ 356 off_t curpos; 357 size_t success; 358 359 curpos = ftello(fd); 360 361 if (fseeko(fd, sector * diskStructure->sectorSize, SEEK_SET) == -1) 362 err(1, "fseeko"); 363 364 success = fwrite(buf, diskStructure->sectorSize * numsecs, 1, fd); 365 366 if (fseeko(fd, curpos, SEEK_SET) == -1) 367 err(1, "fseeko"); 368 369 if (success == 1) 370 success = diskStructure->sectorSize * numsecs; 371 return success; 372} 373 374#if 0 375static int 376cd9660_write_buffered(FILE *fd, off_t offset, int buff_len, 377 const unsigned char* buffer) 378{ 379 static int working_sector = -1; 380 static char buf[CD9660_SECTOR_SIZE]; 381 382 return 0; 383} 384#endif 385 386int 387cd9660_copy_file(iso9660_disk *diskStructure, FILE *fd, off_t start_sector, 388 const char *filename) 389{ 390 FILE *rf; 391 int bytes_read; 392 off_t sector = start_sector; 393 int buf_size = diskStructure->sectorSize; 394 char *buf; 395 396 buf = emalloc(buf_size); 397 if ((rf = fopen(filename, "rb")) == NULL) { 398 warn("%s: cannot open %s", __func__, filename); 399 free(buf); 400 return 0; 401 } 402 403 if (fseeko(fd, start_sector * diskStructure->sectorSize, SEEK_SET) == -1) 404 err(1, "fseeko"); 405 406 while (!feof(rf)) { 407 bytes_read = fread(buf,1,buf_size,rf); 408 if (ferror(rf)) { 409 warn("%s: fread", __func__); 410 free(buf); 411 (void)fclose(rf); 412 return 0; 413 } 414 415 fwrite(buf,1,bytes_read,fd); 416 if (ferror(fd)) { 417 warn("%s: fwrite", __func__); 418 free(buf); 419 (void)fclose(rf); 420 return 0; 421 } 422 sector++; 423 } 424 425 fclose(rf); 426 free(buf); 427 return 1; 428} 429 430static void 431cd9660_write_rr(iso9660_disk *diskStructure, FILE *fd, cd9660node *writenode, 432 off_t offset, off_t sector) 433{ 434 int in_ca = 0; 435 struct ISO_SUSP_ATTRIBUTES *myattr; 436 437 offset += writenode->isoDirRecord->length[0]; 438 if (fseeko(fd, sector * diskStructure->sectorSize + offset, SEEK_SET) == 439 -1) 440 err(1, "fseeko"); 441 /* Offset now points at the end of the record */ 442 TAILQ_FOREACH(myattr, &writenode->head, rr_ll) { 443 fwrite(&(myattr->attr), CD9660_SUSP_ENTRY_SIZE(myattr), 1, fd); 444 445 if (!in_ca) { 446 offset += CD9660_SUSP_ENTRY_SIZE(myattr); 447 if (myattr->last_in_suf) { 448 /* 449 * Point the offset to the start of this 450 * record's CE area 451 */ 452 if (fseeko(fd, ((off_t)diskStructure-> 453 susp_continuation_area_start_sector * 454 diskStructure->sectorSize) 455 + writenode->susp_entry_ce_start, 456 SEEK_SET) == -1) 457 err(1, "fseeko"); 458 in_ca = 1; 459 } 460 } 461 } 462 463 /* 464 * If we had to go to the continuation area, head back to 465 * where we should be. 466 */ 467 if (in_ca) 468 if (fseeko(fd, sector * diskStructure->sectorSize + offset, 469 SEEK_SET) == -1) 470 err(1, "fseeko"); 471} 472