contrib/libarchive-2/libarchive/archive_read_support_format_iso9660.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "archive_platform.h"
  27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_support_format_iso9660.c,v 1.26 2008/05/26 17:00:22 kientzle Exp $");
  28
  29 #ifdef HAVE_ERRNO_H
  30 #include <errno.h>
  31 #endif
  32 /* #include <stdint.h> */ /* See archive_platform.h */
  33 #include <stdio.h>
  34 #ifdef HAVE_STDLIB_H
  35 #include <stdlib.h>
  36 #endif
  37 #ifdef HAVE_STRING_H
  38 #include <string.h>
  39 #endif
  40 #include <time.h>
  41
  42 #include "archive.h"
  43 #include "archive_entry.h"
  44 #include "archive_private.h"
  45 #include "archive_read_private.h"
  46 #include "archive_string.h"
  47
  48 /*
  49  * An overview of ISO 9660 format:
  50  *
  51  * Each disk is laid out as follows:
  52  *   * 32k reserved for private use
  53  *   * Volume descriptor table.  Each volume descriptor
  54  *     is 2k and specifies basic format information.
  55  *     The "Primary Volume Descriptor" (PVD) is defined by the
  56  *     standard and should always be present; other volume
  57  *     descriptors include various vendor-specific extensions.
  58  *   * Files and directories.  Each file/dir is specified by
  59  *     an "extent" (starting sector and length in bytes).
  60  *     Dirs are just files with directory records packed one
  61  *     after another.  The PVD contains a single dir entry
  62  *     specifying the location of the root directory.  Everything
  63  *     else follows from there.
  64  *
  65  * This module works by first reading the volume descriptors, then
  66  * building a list of directory entries, sorted by starting
  67  * sector.  At each step, I look for the earliest dir entry that
  68  * hasn't yet been read, seek forward to that location and read
  69  * that entry.  If it's a dir, I slurp in the new dir entries and
  70  * add them to the heap; if it's a regular file, I return the
  71  * corresponding archive_entry and wait for the client to request
  72  * the file body.  This strategy allows us to read most compliant
  73  * CDs with a single pass through the data, as required by libarchive.
  74  */
  75
  76 /* Structure of on-disk primary volume descriptor. */
  77 #define PVD_type_offset 0
  78 #define PVD_type_size 1
  79 #define PVD_id_offset (PVD_type_offset + PVD_type_size)
  80 #define PVD_id_size 5
  81 #define PVD_version_offset (PVD_id_offset + PVD_id_size)
  82 #define PVD_version_size 1
  83 #define PVD_reserved1_offset (PVD_version_offset + PVD_version_size)
  84 #define PVD_reserved1_size 1
  85 #define PVD_system_id_offset (PVD_reserved1_offset + PVD_reserved1_size)
  86 #define PVD_system_id_size 32
  87 #define PVD_volume_id_offset (PVD_system_id_offset + PVD_system_id_size)
  88 #define PVD_volume_id_size 32
  89 #define PVD_reserved2_offset (PVD_volume_id_offset + PVD_volume_id_size)
  90 #define PVD_reserved2_size 8
  91 #define PVD_volume_space_size_offset (PVD_reserved2_offset + PVD_reserved2_size)
  92 #define PVD_volume_space_size_size 8
  93 #define PVD_reserved3_offset (PVD_volume_space_size_offset + PVD_volume_space_size_size)
  94 #define PVD_reserved3_size 32
  95 #define PVD_volume_set_size_offset (PVD_reserved3_offset + PVD_reserved3_size)
  96 #define PVD_volume_set_size_size 4
  97 #define PVD_volume_sequence_number_offset (PVD_volume_set_size_offset + PVD_volume_set_size_size)
  98 #define PVD_volume_sequence_number_size 4
  99 #define PVD_logical_block_size_offset (PVD_volume_sequence_number_offset + PVD_volume_sequence_number_size)
 100 #define PVD_logical_block_size_size 4
 101 #define PVD_path_table_size_offset (PVD_logical_block_size_offset + PVD_logical_block_size_size)
 102 #define PVD_path_table_size_size 8
 103 #define PVD_type_1_path_table_offset (PVD_path_table_size_offset + PVD_path_table_size_size)
 104 #define PVD_type_1_path_table_size 4
 105 #define PVD_opt_type_1_path_table_offset (PVD_type_1_path_table_offset + PVD_type_1_path_table_size)
 106 #define PVD_opt_type_1_path_table_size 4
 107 #define PVD_type_m_path_table_offset (PVD_opt_type_1_path_table_offset + PVD_opt_type_1_path_table_size)
 108 #define PVD_type_m_path_table_size 4
 109 #define PVD_opt_type_m_path_table_offset (PVD_type_m_path_table_offset + PVD_type_m_path_table_size)
 110 #define PVD_opt_type_m_path_table_size 4
 111 #define PVD_root_directory_record_offset (PVD_opt_type_m_path_table_offset + PVD_opt_type_m_path_table_size)
 112 #define PVD_root_directory_record_size 34
 113 #define PVD_volume_set_id_offset (PVD_root_directory_record_offset + PVD_root_directory_record_size)
 114 #define PVD_volume_set_id_size 128
 115 #define PVD_publisher_id_offset (PVD_volume_set_id_offset + PVD_volume_set_id_size)
 116 #define PVD_publisher_id_size 128
 117 #define PVD_preparer_id_offset (PVD_publisher_id_offset + PVD_publisher_id_size)
 118 #define PVD_preparer_id_size 128
 119 #define PVD_application_id_offset (PVD_preparer_id_offset + PVD_preparer_id_size)
 120 #define PVD_application_id_size 128
 121 #define PVD_copyright_file_id_offset (PVD_application_id_offset + PVD_application_id_size)
 122 #define PVD_copyright_file_id_size 37
 123 #define PVD_abstract_file_id_offset (PVD_copyright_file_id_offset + PVD_copyright_file_id_size)
 124 #define PVD_abstract_file_id_size 37
 125 #define PVD_bibliographic_file_id_offset (PVD_abstract_file_id_offset + PVD_abstract_file_id_size)
 126 #define PVD_bibliographic_file_id_size 37
 127 #define PVD_creation_date_offset (PVD_bibliographic_file_id_offset + PVD_bibliographic_file_id_size)
 128 #define PVD_creation_date_size 17
 129 #define PVD_modification_date_offset (PVD_creation_date_offset + PVD_creation_date_size)
 130 #define PVD_modification_date_size 17
 131 #define PVD_expiration_date_offset (PVD_modification_date_offset + PVD_modification_date_size)
 132 #define PVD_expiration_date_size 17
 133 #define PVD_effective_date_offset (PVD_expiration_date_offset + PVD_expiration_date_size)
 134 #define PVD_effective_date_size 17
 135 #define PVD_file_structure_version_offset (PVD_effective_date_offset + PVD_effective_date_size)
 136 #define PVD_file_structure_version_size 1
 137 #define PVD_reserved4_offset (PVD_file_structure_version_offset + PVD_file_structure_version_size)
 138 #define PVD_reserved4_size 1
 139 #define PVD_application_data_offset (PVD_reserved4_offset + PVD_reserved4_size)
 140 #define PVD_application_data_size 512
 141
 142 /* Structure of an on-disk directory record. */
 143 /* Note:  ISO9660 stores each multi-byte integer twice, once in
 144  * each byte order.  The sizes here are the size of just one
 145  * of the two integers.  (This is why the offset of a field isn't
 146  * the same as the offset+size of the previous field.) */
 147 #define DR_length_offset 0
 148 #define DR_length_size 1
 149 #define DR_ext_attr_length_offset 1
 150 #define DR_ext_attr_length_size 1
 151 #define DR_extent_offset 2
 152 #define DR_extent_size 4
 153 #define DR_size_offset 10
 154 #define DR_size_size 4
 155 #define DR_date_offset 18
 156 #define DR_date_size 7
 157 #define DR_flags_offset 25
 158 #define DR_flags_size 1
 159 #define DR_file_unit_size_offset 26
 160 #define DR_file_unit_size_size 1
 161 #define DR_interleave_offset 27
 162 #define DR_interleave_size 1
 163 #define DR_volume_sequence_number_offset 28
 164 #define DR_volume_sequence_number_size 2
 165 #define DR_name_len_offset 32
 166 #define DR_name_len_size 1
 167 #define DR_name_offset 33
 168
 169 /*
 170  * Our private data.
 171  */
 172
 173 /* In-memory storage for a directory record. */
 174 struct file_info {
 175         struct file_info        *parent;
 176         int              refcount;
 177         uint64_t         offset;  /* Offset on disk. */
 178         uint64_t         size;  /* File size in bytes. */
 179         uint64_t         ce_offset; /* Offset of CE */
 180         uint64_t         ce_size; /* Size of CE */
 181         time_t           mtime; /* File last modified time. */
 182         time_t           atime; /* File last accessed time. */
 183         time_t           ctime; /* File creation time. */
 184         uint64_t         rdev; /* Device number */
 185         mode_t           mode;
 186         uid_t            uid;
 187         gid_t            gid;
 188         ino_t            inode;
 189         int              nlinks;
 190         char            *name; /* Null-terminated filename. */
 191         struct archive_string symlink;
 192 };
 193
 194
 195 struct iso9660 {
 196         int     magic;
 197 #define ISO9660_MAGIC   0x96609660
 198         struct archive_string pathname;
 199         char    seenRockridge; /* Set true if RR extensions are used. */
 200         unsigned char   suspOffset;
 201
 202         uint64_t        previous_offset;
 203         uint64_t        previous_size;
 204         struct archive_string previous_pathname;
 205
 206         /* TODO: Make this a heap for fast inserts and deletions. */
 207         struct file_info **pending_files;
 208         int     pending_files_allocated;
 209         int     pending_files_used;
 210
 211         uint64_t current_position;
 212         ssize_t logical_block_size;
 213
 214         off_t   entry_sparse_offset;
 215         int64_t entry_bytes_remaining;
 216 };
 217
 218 static void     add_entry(struct iso9660 *iso9660, struct file_info *file);
 219 static int      archive_read_format_iso9660_bid(struct archive_read *);
 220 static int      archive_read_format_iso9660_cleanup(struct archive_read *);
 221 static int      archive_read_format_iso9660_read_data(struct archive_read *,
 222                     const void **, size_t *, off_t *);
 223 static int      archive_read_format_iso9660_read_data_skip(struct archive_read *);
 224 static int      archive_read_format_iso9660_read_header(struct archive_read *,
 225                     struct archive_entry *);
 226 static const char *build_pathname(struct archive_string *, struct file_info *);
 227 static void     dump_isodirrec(FILE *, const unsigned char *isodirrec);
 228 static time_t   time_from_tm(struct tm *);
 229 static time_t   isodate17(const unsigned char *);
 230 static time_t   isodate7(const unsigned char *);
 231 static int      isPVD(struct iso9660 *, const unsigned char *);
 232 static struct file_info *next_entry(struct iso9660 *);
 233 static int      next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
 234                     struct file_info **pfile);
 235 static struct file_info *
 236                 parse_file_info(struct iso9660 *iso9660,
 237                     struct file_info *parent, const unsigned char *isodirrec);
 238 static void     parse_rockridge(struct iso9660 *iso9660,
 239                     struct file_info *file, const unsigned char *start,
 240                     const unsigned char *end);
 241 static void     release_file(struct iso9660 *, struct file_info *);
 242 static unsigned toi(const void *p, int n);
 243
 244 int
 245 archive_read_support_format_iso9660(struct archive *_a)
 246 {
 247         struct archive_read *a = (struct archive_read *)_a;
 248         struct iso9660 *iso9660;
 249         int r;
 250
 251         iso9660 = (struct iso9660 *)malloc(sizeof(*iso9660));
 252         if (iso9660 == NULL) {
 253                 archive_set_error(&a->archive, ENOMEM, "Can't allocate iso9660 data");
 254                 return (ARCHIVE_FATAL);
 255         }
 256         memset(iso9660, 0, sizeof(*iso9660));
 257         iso9660->magic = ISO9660_MAGIC;
 258
 259         r = __archive_read_register_format(a,
 260             iso9660,
 261             archive_read_format_iso9660_bid,
 262             archive_read_format_iso9660_read_header,
 263             archive_read_format_iso9660_read_data,
 264             archive_read_format_iso9660_read_data_skip,
 265             archive_read_format_iso9660_cleanup);
 266
 267         if (r != ARCHIVE_OK) {
 268                 free(iso9660);
 269                 return (r);
 270         }
 271         return (ARCHIVE_OK);
 272 }
 273
 274
 275 static int
 276 archive_read_format_iso9660_bid(struct archive_read *a)
 277 {
 278         struct iso9660 *iso9660;
 279         ssize_t bytes_read;
 280         const void *h;
 281         const unsigned char *p;
 282         int bid;
 283
 284         iso9660 = (struct iso9660 *)(a->format->data);
 285
 286         /*
 287          * Skip the first 32k (reserved area) and get the first
 288          * 8 sectors of the volume descriptor table.  Of course,
 289          * if the I/O layer gives us more, we'll take it.
 290          */
 291         bytes_read = (a->decompressor->read_ahead)(a, &h, 32768 + 8*2048);
 292         if (bytes_read < 32768 + 8*2048)
 293             return (-1);
 294         p = (const unsigned char *)h;
 295
 296         /* Skip the reserved area. */
 297         bytes_read -= 32768;
 298         p += 32768;
 299
 300         /* Check each volume descriptor to locate the PVD. */
 301         for (; bytes_read > 2048; bytes_read -= 2048, p += 2048) {
 302                 bid = isPVD(iso9660, p);
 303                 if (bid > 0)
 304                         return (bid);
 305                 if (*p == '\177') /* End-of-volume-descriptor marker. */
 306                         break;
 307         }
 308
 309         /* We didn't find a valid PVD; return a bid of zero. */
 310         return (0);
 311 }
 312
 313 static int
 314 isPVD(struct iso9660 *iso9660, const unsigned char *h)
 315 {
 316         struct file_info *file;
 317
 318         if (h[0] != 1)
 319                 return (0);
 320         if (memcmp(h+1, "CD001", 5) != 0)
 321                 return (0);
 322
 323         iso9660->logical_block_size = toi(h + PVD_logical_block_size_offset, 2);
 324
 325         /* Store the root directory in the pending list. */
 326         file = parse_file_info(iso9660, NULL, h + PVD_root_directory_record_offset);
 327         add_entry(iso9660, file);
 328         return (48);
 329 }
 330
 331 static int
 332 archive_read_format_iso9660_read_header(struct archive_read *a,
 333     struct archive_entry *entry)
 334 {
 335         struct iso9660 *iso9660;
 336         struct file_info *file;
 337         ssize_t bytes_read;
 338         int r;
 339
 340         iso9660 = (struct iso9660 *)(a->format->data);
 341
 342         if (!a->archive.archive_format) {
 343                 a->archive.archive_format = ARCHIVE_FORMAT_ISO9660;
 344                 a->archive.archive_format_name = "ISO9660";
 345         }
 346
 347         /* Get the next entry that appears after the current offset. */
 348         r = next_entry_seek(a, iso9660, &file);
 349         if (r != ARCHIVE_OK)
 350                 return (r);
 351
 352         iso9660->entry_bytes_remaining = file->size;
 353         iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
 354
 355         /* Set up the entry structure with information about this entry. */
 356         archive_entry_set_mode(entry, file->mode);
 357         archive_entry_set_uid(entry, file->uid);
 358         archive_entry_set_gid(entry, file->gid);
 359         archive_entry_set_nlink(entry, file->nlinks);
 360         archive_entry_set_ino(entry, file->inode);
 361         archive_entry_set_mtime(entry, file->mtime, 0);
 362         archive_entry_set_ctime(entry, file->ctime, 0);
 363         archive_entry_set_atime(entry, file->atime, 0);
 364         /* N.B.: Rock Ridge supports 64-bit device numbers. */
 365         archive_entry_set_rdev(entry, (dev_t)file->rdev);
 366         archive_entry_set_size(entry, iso9660->entry_bytes_remaining);
 367         archive_string_empty(&iso9660->pathname);
 368         archive_entry_set_pathname(entry,
 369             build_pathname(&iso9660->pathname, file));
 370         if (file->symlink.s != NULL)
 371                 archive_entry_copy_symlink(entry, file->symlink.s);
 372
 373         /* If this entry points to the same data as the previous
 374          * entry, convert this into a hardlink to that entry.
 375          * But don't bother for zero-length files. */
 376         if (file->offset == iso9660->previous_offset
 377             && file->size == iso9660->previous_size
 378             && file->size > 0) {
 379                 archive_entry_set_hardlink(entry,
 380                     iso9660->previous_pathname.s);
 381                 iso9660->entry_bytes_remaining = 0;
 382                 iso9660->entry_sparse_offset = 0;
 383                 release_file(iso9660, file);
 384                 return (ARCHIVE_OK);
 385         }
 386
 387         /* If the offset is before our current position, we can't
 388          * seek backwards to extract it, so issue a warning. */
 389         if (file->offset < iso9660->current_position) {
 390                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 391                     "Ignoring out-of-order file");
 392                 iso9660->entry_bytes_remaining = 0;
 393                 iso9660->entry_sparse_offset = 0;
 394                 release_file(iso9660, file);
 395                 return (ARCHIVE_WARN);
 396         }
 397
 398         iso9660->previous_size = file->size;
 399         iso9660->previous_offset = file->offset;
 400         archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s);
 401
 402         /* If this is a directory, read in all of the entries right now. */
 403         if (archive_entry_filetype(entry) == AE_IFDIR) {
 404                 while (iso9660->entry_bytes_remaining > 0) {
 405                         const void *block;
 406                         const unsigned char *p;
 407                         ssize_t step = iso9660->logical_block_size;
 408                         if (step > iso9660->entry_bytes_remaining)
 409                                 step = iso9660->entry_bytes_remaining;
 410                         bytes_read = (a->decompressor->read_ahead)(a, &block, step);
 411                         if (bytes_read < step) {
 412                                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 413             "Failed to read full block when scanning ISO9660 directory list");
 414                                 release_file(iso9660, file);
 415                                 return (ARCHIVE_FATAL);
 416                         }
 417                         if (bytes_read > step)
 418                                 bytes_read = step;
 419                         (a->decompressor->consume)(a, bytes_read);
 420                         iso9660->current_position += bytes_read;
 421                         iso9660->entry_bytes_remaining -= bytes_read;
 422                         for (p = (const unsigned char *)block;
 423                              *p != 0 && p < (const unsigned char *)block + bytes_read;
 424                              p += *p) {
 425                                 struct file_info *child;
 426
 427                                 /* Skip '.' entry. */
 428                                 if (*(p + DR_name_len_offset) == 1
 429                                     && *(p + DR_name_offset) == '\0')
 430                                         continue;
 431                                 /* Skip '..' entry. */
 432                                 if (*(p + DR_name_len_offset) == 1
 433                                     && *(p + DR_name_offset) == '\001')
 434                                         continue;
 435                                 child = parse_file_info(iso9660, file, p);
 436                                 add_entry(iso9660, child);
 437                                 if (iso9660->seenRockridge) {
 438                                         a->archive.archive_format =
 439                                             ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
 440                                         a->archive.archive_format_name =
 441                                             "ISO9660 with Rockridge extensions";
 442                                 }
 443                         }
 444                 }
 445         }
 446
 447         release_file(iso9660, file);
 448         return (ARCHIVE_OK);
 449 }
 450
 451 static int
 452 archive_read_format_iso9660_read_data_skip(struct archive_read *a)
 453 {
 454         /* Because read_next_header always does an explicit skip
 455          * to the next entry, we don't need to do anything here. */
 456         (void)a; /* UNUSED */
 457         return (ARCHIVE_OK);
 458 }
 459
 460 static int
 461 archive_read_format_iso9660_read_data(struct archive_read *a,
 462     const void **buff, size_t *size, off_t *offset)
 463 {
 464         ssize_t bytes_read;
 465         struct iso9660 *iso9660;
 466
 467         iso9660 = (struct iso9660 *)(a->format->data);
 468         if (iso9660->entry_bytes_remaining <= 0) {
 469                 *buff = NULL;
 470                 *size = 0;
 471                 *offset = iso9660->entry_sparse_offset;
 472                 return (ARCHIVE_EOF);
 473         }
 474
 475         bytes_read = (a->decompressor->read_ahead)(a, buff, 1);
 476         if (bytes_read == 0)
 477                 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
 478                     "Truncated input file");
 479         if (bytes_read <= 0)
 480                 return (ARCHIVE_FATAL);
 481         if (bytes_read > iso9660->entry_bytes_remaining)
 482                 bytes_read = iso9660->entry_bytes_remaining;
 483         *size = bytes_read;
 484         *offset = iso9660->entry_sparse_offset;
 485         iso9660->entry_sparse_offset += bytes_read;
 486         iso9660->entry_bytes_remaining -= bytes_read;
 487         iso9660->current_position += bytes_read;
 488         (a->decompressor->consume)(a, bytes_read);
 489         return (ARCHIVE_OK);
 490 }
 491
 492 static int
 493 archive_read_format_iso9660_cleanup(struct archive_read *a)
 494 {
 495         struct iso9660 *iso9660;
 496         struct file_info *file;
 497
 498         iso9660 = (struct iso9660 *)(a->format->data);
 499         while ((file = next_entry(iso9660)) != NULL)
 500                 release_file(iso9660, file);
 501         archive_string_free(&iso9660->pathname);
 502         archive_string_free(&iso9660->previous_pathname);
 503         if (iso9660->pending_files)
 504                 free(iso9660->pending_files);
 505         free(iso9660);
 506         (a->format->data) = NULL;
 507         return (ARCHIVE_OK);
 508 }
 509
 510 /*
 511  * This routine parses a single ISO directory record, makes sense
 512  * of any extensions, and stores the result in memory.
 513  */
 514 static struct file_info *
 515 parse_file_info(struct iso9660 *iso9660, struct file_info *parent,
 516     const unsigned char *isodirrec)
 517 {
 518         struct file_info *file;
 519         size_t name_len;
 520         int flags;
 521
 522         /* TODO: Sanity check that name_len doesn't exceed length, etc. */
 523
 524         /* Create a new file entry and copy data from the ISO dir record. */
 525         file = (struct file_info *)malloc(sizeof(*file));
 526         if (file == NULL)
 527                 return (NULL);
 528         memset(file, 0, sizeof(*file));
 529         file->parent = parent;
 530         if (parent != NULL)
 531                 parent->refcount++;
 532         file->offset = toi(isodirrec + DR_extent_offset, DR_extent_size)
 533             * iso9660->logical_block_size;
 534         file->size = toi(isodirrec + DR_size_offset, DR_size_size);
 535         file->mtime = isodate7(isodirrec + DR_date_offset);
 536         file->ctime = file->atime = file->mtime;
 537         name_len = (size_t)*(const unsigned char *)(isodirrec + DR_name_len_offset);
 538         file->name = (char *)malloc(name_len + 1);
 539         if (file->name == NULL) {
 540                 free(file);
 541                 return (NULL);
 542         }
 543         memcpy(file->name, isodirrec + DR_name_offset, name_len);
 544         file->name[name_len] = '\0';
 545         flags = *(isodirrec + DR_flags_offset);
 546         if (flags & 0x02)
 547                 file->mode = AE_IFDIR | 0700;
 548         else
 549                 file->mode = AE_IFREG | 0400;
 550
 551         /* Rockridge extensions overwrite information from above. */
 552         {
 553                 const unsigned char *rr_start, *rr_end;
 554                 rr_end = (const unsigned char *)isodirrec
 555                     + *(isodirrec + DR_length_offset);
 556                 rr_start = (const unsigned char *)(isodirrec + DR_name_offset
 557                     + name_len);
 558                 if ((name_len & 1) == 0)
 559                         rr_start++;
 560                 rr_start += iso9660->suspOffset;
 561                 parse_rockridge(iso9660, file, rr_start, rr_end);
 562         }
 563
 564         /* DEBUGGING: Warn about attributes I don't yet fully support. */
 565         if ((flags & ~0x02) != 0) {
 566                 fprintf(stderr, "\n ** Unrecognized flag: ");
 567                 dump_isodirrec(stderr, isodirrec);
 568                 fprintf(stderr, "\n");
 569         } else if (toi(isodirrec + DR_volume_sequence_number_offset, 2) != 1) {
 570                 fprintf(stderr, "\n ** Unrecognized sequence number: ");
 571                 dump_isodirrec(stderr, isodirrec);
 572                 fprintf(stderr, "\n");
 573         } else if (*(isodirrec + DR_file_unit_size_offset) != 0) {
 574                 fprintf(stderr, "\n ** Unexpected file unit size: ");
 575                 dump_isodirrec(stderr, isodirrec);
 576                 fprintf(stderr, "\n");
 577         } else if (*(isodirrec + DR_interleave_offset) != 0) {
 578                 fprintf(stderr, "\n ** Unexpected interleave: ");
 579                 dump_isodirrec(stderr, isodirrec);
 580                 fprintf(stderr, "\n");
 581         } else if (*(isodirrec + DR_ext_attr_length_offset) != 0) {
 582                 fprintf(stderr, "\n ** Unexpected extended attribute length: ");
 583                 dump_isodirrec(stderr, isodirrec);
 584                 fprintf(stderr, "\n");
 585         }
 586
 587         return (file);
 588 }
 589
 590 static void
 591 add_entry(struct iso9660 *iso9660, struct file_info *file)
 592 {
 593         /* Expand our pending files list as necessary. */
 594         if (iso9660->pending_files_used >= iso9660->pending_files_allocated) {
 595                 struct file_info **new_pending_files;
 596                 int new_size = iso9660->pending_files_allocated * 2;
 597
 598                 if (iso9660->pending_files_allocated < 1024)
 599                         new_size = 1024;
 600                 /* Overflow might keep us from growing the list. */
 601                 if (new_size <= iso9660->pending_files_allocated)
 602                         __archive_errx(1, "Out of memory");
 603                 new_pending_files = (struct file_info **)malloc(new_size * sizeof(new_pending_files[0]));
 604                 if (new_pending_files == NULL)
 605                         __archive_errx(1, "Out of memory");
 606                 memcpy(new_pending_files, iso9660->pending_files,
 607                     iso9660->pending_files_allocated * sizeof(new_pending_files[0]));
 608                 if (iso9660->pending_files != NULL)
 609                         free(iso9660->pending_files);
 610                 iso9660->pending_files = new_pending_files;
 611                 iso9660->pending_files_allocated = new_size;
 612         }
 613
 614         iso9660->pending_files[iso9660->pending_files_used++] = file;
 615 }
 616
 617 static void
 618 parse_rockridge(struct iso9660 *iso9660, struct file_info *file,
 619     const unsigned char *p, const unsigned char *end)
 620 {
 621         (void)iso9660; /* UNUSED */
 622
 623         while (p + 4 < end  /* Enough space for another entry. */
 624             && p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
 625             && p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
 626             && p + p[2] <= end) { /* Sanity-check length. */
 627                 const unsigned char *data = p + 4;
 628                 int data_length = p[2] - 4;
 629                 int version = p[3];
 630
 631                 /*
 632                  * Yes, each 'if' here does test p[0] again.
 633                  * Otherwise, the fall-through handling to catch
 634                  * unsupported extensions doesn't work.
 635                  */
 636                 switch(p[0]) {
 637                 case 'C':
 638                         if (p[0] == 'C' && p[1] == 'E' && version == 1) {
 639                                 /*
 640                                  * CE extension comprises:
 641                                  *   8 byte sector containing extension
 642                                  *   8 byte offset w/in above sector
 643                                  *   8 byte length of continuation
 644                                  */
 645                                 file->ce_offset = toi(data, 4)
 646                                     * iso9660->logical_block_size
 647                                     + toi(data + 8, 4);
 648                                 file->ce_size = toi(data + 16, 4);
 649                                 break;
 650                         }
 651                         /* FALLTHROUGH */
 652                 case 'N':
 653                         if (p[0] == 'N' && p[1] == 'M' && version == 1
 654                                 && *data == 0) {
 655                                 /* NM extension with flag byte == 0 */
 656                                 /*
 657                                  * NM extension comprises:
 658                                  *   one byte flag
 659                                  *   rest is long name
 660                                  */
 661                                 /* TODO: Obey flags. */
 662                                 char *old_name = file->name;
 663
 664                                 data++;  /* Skip flag byte. */
 665                                 data_length--;
 666                                 file->name = (char *)malloc(data_length + 1);
 667                                 if (file->name != NULL) {
 668                                         free(old_name);
 669                                         memcpy(file->name, data, data_length);
 670                                         file->name[data_length] = '\0';
 671                                 } else
 672                                         file->name = old_name;
 673                                 break;
 674                         }
 675                         /* FALLTHROUGH */
 676                 case 'P':
 677                         if (p[0] == 'P' && p[1] == 'D' && version == 1) {
 678                                 /*
 679                                  * PD extension is padding;
 680                                  * contents are always ignored.
 681                                  */
 682                                 break;
 683                         }
 684                         if (p[0] == 'P' && p[1] == 'N' && version == 1) {
 685                                 if (data_length == 16) {
 686                                         file->rdev = toi(data,4);
 687                                         file->rdev <<= 32;
 688                                         file->rdev |= toi(data + 8, 4);
 689                                 }
 690                                 break;
 691                         }
 692                         if (p[0] == 'P' && p[1] == 'X' && version == 1) {
 693                                 /*
 694                                  * PX extension comprises:
 695                                  *   8 bytes for mode,
 696                                  *   8 bytes for nlinks,
 697                                  *   8 bytes for uid,
 698                                  *   8 bytes for gid,
 699                                  *   8 bytes for inode.
 700                                  */
 701                                 if (data_length == 32) {
 702                                         file->mode = toi(data, 4);
 703                                         file->nlinks = toi(data + 8, 4);
 704                                         file->uid = toi(data + 16, 4);
 705                                         file->gid = toi(data + 24, 4);
 706                                         file->inode = toi(data + 32, 4);
 707                                 }
 708                                 break;
 709                         }
 710                         /* FALLTHROUGH */
 711                 case 'R':
 712                         if (p[0] == 'R' && p[1] == 'R' && version == 1) {
 713                                 iso9660->seenRockridge = 1;
 714                                 /*
 715                                  * RR extension comprises:
 716                                  *    one byte flag value
 717                                  */
 718                                 /* TODO: Handle RR extension. */
 719                                 break;
 720                         }
 721                         /* FALLTHROUGH */
 722                 case 'S':
 723                         if (p[0] == 'S' && p[1] == 'L' && version == 1
 724                             && *data == 0) {
 725                                 int cont = 1;
 726                                 /* SL extension with flags == 0 */
 727                                 /* TODO: handle non-zero flag values. */
 728                                 data++;  /* Skip flag byte. */
 729                                 data_length--;
 730                                 while (data_length > 0) {
 731                                         unsigned char flag = *data++;
 732                                         unsigned char nlen = *data++;
 733                                         data_length -= 2;
 734
 735                                         if (cont == 0)
 736                                                 archive_strcat(&file->symlink, "/");
 737                                         cont = 0;
 738
 739                                         switch(flag) {
 740                                         case 0x01: /* Continue */
 741                                                 archive_strncat(&file->symlink,
 742                                                     (const char *)data, nlen);
 743                                                 cont = 1;
 744                                                 break;
 745                                         case 0x02: /* Current */
 746                                                 archive_strcat(&file->symlink, ".");
 747                                                 break;
 748                                         case 0x04: /* Parent */
 749                                                 archive_strcat(&file->symlink, "..");
 750                                                 break;
 751                                         case 0x08: /* Root */
 752                                         case 0x10: /* Volume root */
 753                                                 archive_string_empty(&file->symlink);
 754                                                 break;
 755                                         case 0x20: /* Hostname */
 756                                                 archive_strcat(&file->symlink, "hostname");
 757                                                 break;
 758                                         case 0:
 759                                                 archive_strncat(&file->symlink,
 760                                                     (const char *)data, nlen);
 761                                                 break;
 762                                         default:
 763                                                 /* TODO: issue a warning ? */
 764                                                 break;
 765                                         }
 766                                         data += nlen;
 767                                         data_length -= nlen;
 768                                 }
 769                                 break;
 770                         }
 771                         if (p[0] == 'S' && p[1] == 'P'
 772                             && version == 1 && data_length == 7
 773                             && data[0] == (unsigned char)'\xbe'
 774                             && data[1] == (unsigned char)'\xef') {
 775                                 /*
 776                                  * SP extension stores the suspOffset
 777                                  * (Number of bytes to skip between
 778                                  * filename and SUSP records.)
 779                                  * It is mandatory by the SUSP standard
 780                                  * (IEEE 1281).
 781                                  *
 782                                  * It allows SUSP to coexist with
 783                                  * non-SUSP uses of the System
 784                                  * Use Area by placing non-SUSP data
 785                                  * before SUSP data.
 786                                  *
 787                                  * TODO: Add a check for 'SP' in
 788                                  * first directory entry, disable all SUSP
 789                                  * processing if not found.
 790                                  */
 791                                 iso9660->suspOffset = data[2];
 792                                 break;
 793                         }
 794                         if (p[0] == 'S' && p[1] == 'T'
 795                             && data_length == 0 && version == 1) {
 796                                 /*
 797                                  * ST extension marks end of this
 798                                  * block of SUSP entries.
 799                                  *
 800                                  * It allows SUSP to coexist with
 801                                  * non-SUSP uses of the System
 802                                  * Use Area by placing non-SUSP data
 803                                  * after SUSP data.
 804                                  */
 805                                 return;
 806                         }
 807                 case 'T':
 808                         if (p[0] == 'T' && p[1] == 'F' && version == 1) {
 809                                 char flag = data[0];
 810                                 /*
 811                                  * TF extension comprises:
 812                                  *   one byte flag
 813                                  *   create time (optional)
 814                                  *   modify time (optional)
 815                                  *   access time (optional)
 816                                  *   attribute time (optional)
 817                                  *  Time format and presence of fields
 818                                  *  is controlled by flag bits.
 819                                  */
 820                                 data++;
 821                                 if (flag & 0x80) {
 822                                         /* Use 17-byte time format. */
 823                                         if (flag & 1) /* Create time. */
 824                                                 data += 17;
 825                                         if (flag & 2) { /* Modify time. */
 826                                                 file->mtime = isodate17(data);
 827                                                 data += 17;
 828                                         }
 829                                         if (flag & 4) { /* Access time. */
 830                                                 file->atime = isodate17(data);
 831                                                 data += 17;
 832                                         }
 833                                         if (flag & 8) { /* Attribute time. */
 834                                                 file->ctime = isodate17(data);
 835                                                 data += 17;
 836                                         }
 837                                 } else {
 838                                         /* Use 7-byte time format. */
 839                                         if (flag & 1) /* Create time. */
 840                                                 data += 7;
 841                                         if (flag & 2) { /* Modify time. */
 842                                                 file->mtime = isodate7(data);
 843                                                 data += 7;
 844                                         }
 845                                         if (flag & 4) { /* Access time. */
 846                                                 file->atime = isodate7(data);
 847                                                 data += 7;
 848                                         }
 849                                         if (flag & 8) { /* Attribute time. */
 850                                                 file->ctime = isodate7(data);
 851                                                 data += 7;
 852                                         }
 853                                 }
 854                                 break;
 855                         }
 856                         /* FALLTHROUGH */
 857                 default:
 858                         /* The FALLTHROUGHs above leave us here for
 859                          * any unsupported extension. */
 860                         {
 861                                 const unsigned char *t;
 862                                 fprintf(stderr, "\nUnsupported RRIP extension for %s\n", file->name);
 863                                 fprintf(stderr, " %c%c(%d):", p[0], p[1], data_length);
 864                                 for (t = data; t < data + data_length && t < data + 16; t++)
 865                                         fprintf(stderr, " %02x", *t);
 866                                 fprintf(stderr, "\n");
 867                         }
 868                 }
 869
 870
 871
 872                 p += p[2];
 873         }
 874 }
 875
 876 static void
 877 release_file(struct iso9660 *iso9660, struct file_info *file)
 878 {
 879         struct file_info *parent;
 880
 881         if (file->refcount == 0) {
 882                 parent = file->parent;
 883                 if (file->name)
 884                         free(file->name);
 885                 archive_string_free(&file->symlink);
 886                 free(file);
 887                 if (parent != NULL) {
 888                         parent->refcount--;
 889                         release_file(iso9660, parent);
 890                 }
 891         }
 892 }
 893
 894 static int
 895 next_entry_seek(struct archive_read *a, struct iso9660 *iso9660,
 896     struct file_info **pfile)
 897 {
 898         struct file_info *file;
 899         uint64_t offset;
 900
 901         *pfile = NULL;
 902         for (;;) {
 903                 *pfile = file = next_entry(iso9660);
 904                 if (file == NULL)
 905                         return (ARCHIVE_EOF);
 906
 907                 /* CE area precedes actual file data? Ignore it. */
 908                 if (file->ce_offset > file->offset) {
 909 fprintf(stderr, " *** Discarding CE data.\n");
 910                         file->ce_offset = 0;
 911                         file->ce_size = 0;
 912                 }
 913
 914                 /* Don't waste time seeking for zero-length bodies. */
 915                 if (file->size == 0) {
 916                         file->offset = iso9660->current_position;
 917                 }
 918
 919                 /* If CE exists, find and read it now. */
 920                 if (file->ce_offset > 0)
 921                         offset = file->ce_offset;
 922                 else
 923                         offset = file->offset;
 924
 925                 /* Seek forward to the start of the entry. */
 926                 if (iso9660->current_position < offset) {
 927                         off_t step = offset - iso9660->current_position;
 928                         off_t bytes_read;
 929                         bytes_read = (a->decompressor->skip)(a, step);
 930                         if (bytes_read < 0)
 931                                 return (bytes_read);
 932                         iso9660->current_position = offset;
 933                 }
 934
 935                 /* We found body of file; handle it now. */
 936                 if (offset == file->offset)
 937                         return (ARCHIVE_OK);
 938
 939                 /* Found CE?  Process it and push the file back onto list. */
 940                 if (offset == file->ce_offset) {
 941                         const void *p;
 942                         ssize_t size = file->ce_size;
 943                         ssize_t bytes_read;
 944                         const unsigned char *rr_start;
 945
 946                         file->ce_offset = 0;
 947                         file->ce_size = 0;
 948                         bytes_read = (a->decompressor->read_ahead)(a, &p, size);
 949                         if (bytes_read > size)
 950                                 bytes_read = size;
 951                         rr_start = (const unsigned char *)p;
 952                         parse_rockridge(iso9660, file, rr_start,
 953                             rr_start + bytes_read);
 954                         (a->decompressor->consume)(a, bytes_read);
 955                         iso9660->current_position += bytes_read;
 956                         add_entry(iso9660, file);
 957                 }
 958         }
 959 }
 960
 961 static struct file_info *
 962 next_entry(struct iso9660 *iso9660)
 963 {
 964         int least_index;
 965         uint64_t least_end_offset;
 966         int i;
 967         struct file_info *r;
 968
 969         if (iso9660->pending_files_used < 1)
 970                 return (NULL);
 971
 972         /* Assume the first file in the list is the earliest on disk. */
 973         least_index = 0;
 974         least_end_offset = iso9660->pending_files[0]->offset
 975             + iso9660->pending_files[0]->size;
 976
 977         /* Now, try to find an earlier one. */
 978         for (i = 0; i < iso9660->pending_files_used; i++) {
 979                 /* Use the position of the file *end* as our comparison. */
 980                 uint64_t end_offset = iso9660->pending_files[i]->offset
 981                     + iso9660->pending_files[i]->size;
 982                 if (iso9660->pending_files[i]->ce_offset > 0
 983                     && iso9660->pending_files[i]->ce_offset < iso9660->pending_files[i]->offset)
 984                         end_offset = iso9660->pending_files[i]->ce_offset
 985                     + iso9660->pending_files[i]->ce_size;
 986                 if (least_end_offset > end_offset) {
 987                         least_index = i;
 988                         least_end_offset = end_offset;
 989                 }
 990         }
 991         r = iso9660->pending_files[least_index];
 992         iso9660->pending_files[least_index]
 993             = iso9660->pending_files[--iso9660->pending_files_used];
 994         return (r);
 995 }
 996
 997 static unsigned int
 998 toi(const void *p, int n)
 999 {
1000         const unsigned char *v = (const unsigned char *)p;
1001         if (n > 1)
1002                 return v[0] + 256 * toi(v + 1, n - 1);
1003         if (n == 1)
1004                 return v[0];
1005         return (0);
1006 }
1007
1008 static time_t
1009 isodate7(const unsigned char *v)
1010 {
1011         struct tm tm;
1012         int offset;
1013         memset(&tm, 0, sizeof(tm));
1014         tm.tm_year = v[0];
1015         tm.tm_mon = v[1] - 1;
1016         tm.tm_mday = v[2];
1017         tm.tm_hour = v[3];
1018         tm.tm_min = v[4];
1019         tm.tm_sec = v[5];
1020         /* v[6] is the signed timezone offset, in 1/4-hour increments. */
1021         offset = ((const signed char *)v)[6];
1022         if (offset > -48 && offset < 52) {
1023                 tm.tm_hour -= offset / 4;
1024                 tm.tm_min -= (offset % 4) * 15;
1025         }
1026         return (time_from_tm(&tm));
1027 }
1028
1029 static time_t
1030 isodate17(const unsigned char *v)
1031 {
1032         struct tm tm;
1033         int offset;
1034         memset(&tm, 0, sizeof(tm));
1035         tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100
1036             + (v[2] - '0') * 10 + (v[3] - '0')
1037             - 1900;
1038         tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0');
1039         tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0');
1040         tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0');
1041         tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0');
1042         tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0');
1043         /* v[16] is the signed timezone offset, in 1/4-hour increments. */
1044         offset = ((const signed char *)v)[16];
1045         if (offset > -48 && offset < 52) {
1046                 tm.tm_hour -= offset / 4;
1047                 tm.tm_min -= (offset % 4) * 15;
1048         }
1049         return (time_from_tm(&tm));
1050 }
1051
1052 static time_t
1053 time_from_tm(struct tm *t)
1054 {
1055 #if HAVE_TIMEGM
1056         /* Use platform timegm() if available. */
1057         return (timegm(t));
1058 #else
1059         /* Else use direct calculation using POSIX assumptions. */
1060         /* First, fix up tm_yday based on the year/month/day. */
1061         mktime(t);
1062         /* Then we can compute timegm() from first principles. */
1063         return (t->tm_sec + t->tm_min * 60 + t->tm_hour * 3600
1064             + t->tm_yday * 86400 + (t->tm_year - 70) * 31536000
1065             + ((t->tm_year - 69) / 4) * 86400 -
1066             ((t->tm_year - 1) / 100) * 86400
1067             + ((t->tm_year + 299) / 400) * 86400);
1068 #endif
1069 }
1070
1071 static const char *
1072 build_pathname(struct archive_string *as, struct file_info *file)
1073 {
1074         if (file->parent != NULL && file->parent->name[0] != '\0') {
1075                 build_pathname(as, file->parent);
1076                 archive_strcat(as, "/");
1077         }
1078         if (file->name[0] == '\0')
1079                 archive_strcat(as, ".");
1080         else
1081                 archive_strcat(as, file->name);
1082         return (as->s);
1083 }
1084
1085 static void
1086 dump_isodirrec(FILE *out, const unsigned char *isodirrec)
1087 {
1088         fprintf(out, " l %d,",
1089             toi(isodirrec + DR_length_offset, DR_length_size));
1090         fprintf(out, " a %d,",
1091             toi(isodirrec + DR_ext_attr_length_offset, DR_ext_attr_length_size));
1092         fprintf(out, " ext 0x%x,",
1093             toi(isodirrec + DR_extent_offset, DR_extent_size));
1094         fprintf(out, " s %d,",
1095             toi(isodirrec + DR_size_offset, DR_extent_size));
1096         fprintf(out, " f 0x%02x,",
1097             toi(isodirrec + DR_flags_offset, DR_flags_size));
1098         fprintf(out, " u %d,",
1099             toi(isodirrec + DR_file_unit_size_offset, DR_file_unit_size_size));
1100         fprintf(out, " ilv %d,",
1101             toi(isodirrec + DR_interleave_offset, DR_interleave_size));
1102         fprintf(out, " seq %d,",
1103             toi(isodirrec + DR_volume_sequence_number_offset, DR_volume_sequence_number_size));
1104         fprintf(out, " nl %d:",
1105             toi(isodirrec + DR_name_len_offset, DR_name_len_size));
1106         fprintf(out, " `%.*s'",
1107             toi(isodirrec + DR_name_len_offset, DR_name_len_size), isodirrec + DR_name_offset);
1108 }