/*- * Copyright (c) 2003-2007 Tim Kientzle * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "archive_platform.h" __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_support_format_iso9660.c,v 1.30 2008/12/06 06:57:45 kientzle Exp $"); #ifdef HAVE_ERRNO_H #include #endif /* #include */ /* See archive_platform.h */ #include #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_STRING_H #include #endif #include #include "archive.h" #include "archive_entry.h" #include "archive_private.h" #include "archive_read_private.h" #include "archive_string.h" /* * An overview of ISO 9660 format: * * Each disk is laid out as follows: * * 32k reserved for private use * * Volume descriptor table. Each volume descriptor * is 2k and specifies basic format information. * The "Primary Volume Descriptor" (PVD) is defined by the * standard and should always be present; other volume * descriptors include various vendor-specific extensions. * * Files and directories. Each file/dir is specified by * an "extent" (starting sector and length in bytes). * Dirs are just files with directory records packed one * after another. The PVD contains a single dir entry * specifying the location of the root directory. Everything * else follows from there. * * This module works by first reading the volume descriptors, then * building a list of directory entries, sorted by starting * sector. At each step, I look for the earliest dir entry that * hasn't yet been read, seek forward to that location and read * that entry. If it's a dir, I slurp in the new dir entries and * add them to the heap; if it's a regular file, I return the * corresponding archive_entry and wait for the client to request * the file body. This strategy allows us to read most compliant * CDs with a single pass through the data, as required by libarchive. */ /* Structure of on-disk primary volume descriptor. */ #define PVD_type_offset 0 #define PVD_type_size 1 #define PVD_id_offset (PVD_type_offset + PVD_type_size) #define PVD_id_size 5 #define PVD_version_offset (PVD_id_offset + PVD_id_size) #define PVD_version_size 1 #define PVD_reserved1_offset (PVD_version_offset + PVD_version_size) #define PVD_reserved1_size 1 #define PVD_system_id_offset (PVD_reserved1_offset + PVD_reserved1_size) #define PVD_system_id_size 32 #define PVD_volume_id_offset (PVD_system_id_offset + PVD_system_id_size) #define PVD_volume_id_size 32 #define PVD_reserved2_offset (PVD_volume_id_offset + PVD_volume_id_size) #define PVD_reserved2_size 8 #define PVD_volume_space_size_offset (PVD_reserved2_offset + PVD_reserved2_size) #define PVD_volume_space_size_size 8 #define PVD_reserved3_offset (PVD_volume_space_size_offset + PVD_volume_space_size_size) #define PVD_reserved3_size 32 #define PVD_volume_set_size_offset (PVD_reserved3_offset + PVD_reserved3_size) #define PVD_volume_set_size_size 4 #define PVD_volume_sequence_number_offset (PVD_volume_set_size_offset + PVD_volume_set_size_size) #define PVD_volume_sequence_number_size 4 #define PVD_logical_block_size_offset (PVD_volume_sequence_number_offset + PVD_volume_sequence_number_size) #define PVD_logical_block_size_size 4 #define PVD_path_table_size_offset (PVD_logical_block_size_offset + PVD_logical_block_size_size) #define PVD_path_table_size_size 8 #define PVD_type_1_path_table_offset (PVD_path_table_size_offset + PVD_path_table_size_size) #define PVD_type_1_path_table_size 4 #define PVD_opt_type_1_path_table_offset (PVD_type_1_path_table_offset + PVD_type_1_path_table_size) #define PVD_opt_type_1_path_table_size 4 #define PVD_type_m_path_table_offset (PVD_opt_type_1_path_table_offset + PVD_opt_type_1_path_table_size) #define PVD_type_m_path_table_size 4 #define PVD_opt_type_m_path_table_offset (PVD_type_m_path_table_offset + PVD_type_m_path_table_size) #define PVD_opt_type_m_path_table_size 4 #define PVD_root_directory_record_offset (PVD_opt_type_m_path_table_offset + PVD_opt_type_m_path_table_size) #define PVD_root_directory_record_size 34 #define PVD_volume_set_id_offset (PVD_root_directory_record_offset + PVD_root_directory_record_size) #define PVD_volume_set_id_size 128 #define PVD_publisher_id_offset (PVD_volume_set_id_offset + PVD_volume_set_id_size) #define PVD_publisher_id_size 128 #define PVD_preparer_id_offset (PVD_publisher_id_offset + PVD_publisher_id_size) #define PVD_preparer_id_size 128 #define PVD_application_id_offset (PVD_preparer_id_offset + PVD_preparer_id_size) #define PVD_application_id_size 128 #define PVD_copyright_file_id_offset (PVD_application_id_offset + PVD_application_id_size) #define PVD_copyright_file_id_size 37 #define PVD_abstract_file_id_offset (PVD_copyright_file_id_offset + PVD_copyright_file_id_size) #define PVD_abstract_file_id_size 37 #define PVD_bibliographic_file_id_offset (PVD_abstract_file_id_offset + PVD_abstract_file_id_size) #define PVD_bibliographic_file_id_size 37 #define PVD_creation_date_offset (PVD_bibliographic_file_id_offset + PVD_bibliographic_file_id_size) #define PVD_creation_date_size 17 #define PVD_modification_date_offset (PVD_creation_date_offset + PVD_creation_date_size) #define PVD_modification_date_size 17 #define PVD_expiration_date_offset (PVD_modification_date_offset + PVD_modification_date_size) #define PVD_expiration_date_size 17 #define PVD_effective_date_offset (PVD_expiration_date_offset + PVD_expiration_date_size) #define PVD_effective_date_size 17 #define PVD_file_structure_version_offset (PVD_effective_date_offset + PVD_effective_date_size) #define PVD_file_structure_version_size 1 #define PVD_reserved4_offset (PVD_file_structure_version_offset + PVD_file_structure_version_size) #define PVD_reserved4_size 1 #define PVD_application_data_offset (PVD_reserved4_offset + PVD_reserved4_size) #define PVD_application_data_size 512 #define PVD_reserved5_offset (PVD_application_data_offset + PVD_application_data_size) #define PVD_reserved5_size (2048 - PVD_reserved5_offset) /* TODO: It would make future maintenance easier to just hardcode the * above values. In particular, ECMA119 states the offsets as part of * the standard. That would eliminate the need for the following check.*/ #if PVD_reserved5_offset != 1395 #error PVD offset and size definitions are wrong. #endif /* Structure of an on-disk directory record. */ /* Note: ISO9660 stores each multi-byte integer twice, once in * each byte order. The sizes here are the size of just one * of the two integers. (This is why the offset of a field isn't * the same as the offset+size of the previous field.) */ #define DR_length_offset 0 #define DR_length_size 1 #define DR_ext_attr_length_offset 1 #define DR_ext_attr_length_size 1 #define DR_extent_offset 2 #define DR_extent_size 4 #define DR_size_offset 10 #define DR_size_size 4 #define DR_date_offset 18 #define DR_date_size 7 #define DR_flags_offset 25 #define DR_flags_size 1 #define DR_file_unit_size_offset 26 #define DR_file_unit_size_size 1 #define DR_interleave_offset 27 #define DR_interleave_size 1 #define DR_volume_sequence_number_offset 28 #define DR_volume_sequence_number_size 2 #define DR_name_len_offset 32 #define DR_name_len_size 1 #define DR_name_offset 33 /* * Our private data. */ /* In-memory storage for a directory record. */ struct file_info { struct file_info *parent; int refcount; uint64_t offset; /* Offset on disk. */ uint64_t size; /* File size in bytes. */ uint64_t ce_offset; /* Offset of CE */ uint64_t ce_size; /* Size of CE */ time_t birthtime; /* File created time. */ time_t mtime; /* File last modified time. */ time_t atime; /* File last accessed time. */ time_t ctime; /* File attribute change time. */ uint64_t rdev; /* Device number */ mode_t mode; uid_t uid; gid_t gid; ino_t inode; int nlinks; struct archive_string name; /* Pathname */ char name_continues; /* Non-zero if name continues */ struct archive_string symlink; char symlink_continues; /* Non-zero if link continues */ }; struct iso9660 { int magic; #define ISO9660_MAGIC 0x96609660 struct archive_string pathname; char seenRockridge; /* Set true if RR extensions are used. */ unsigned char suspOffset; uint64_t previous_offset; uint64_t previous_size; struct archive_string previous_pathname; /* TODO: Make this a heap for fast inserts and deletions. */ struct file_info **pending_files; int pending_files_allocated; int pending_files_used; uint64_t current_position; ssize_t logical_block_size; uint64_t volume_size; /* Total size of volume in bytes. */ off_t entry_sparse_offset; int64_t entry_bytes_remaining; }; static void add_entry(struct iso9660 *iso9660, struct file_info *file); static int archive_read_format_iso9660_bid(struct archive_read *); static int archive_read_format_iso9660_cleanup(struct archive_read *); static int archive_read_format_iso9660_read_data(struct archive_read *, const void **, size_t *, off_t *); static int archive_read_format_iso9660_read_data_skip(struct archive_read *); static int archive_read_format_iso9660_read_header(struct archive_read *, struct archive_entry *); static const char *build_pathname(struct archive_string *, struct file_info *); #if DEBUG static void dump_isodirrec(FILE *, const unsigned char *isodirrec); #endif static time_t time_from_tm(struct tm *); static time_t isodate17(const unsigned char *); static time_t isodate7(const unsigned char *); static int isPVD(struct iso9660 *, const unsigned char *); static struct file_info *next_entry(struct iso9660 *); static int next_entry_seek(struct archive_read *a, struct iso9660 *iso9660, struct file_info **pfile); static struct file_info * parse_file_info(struct iso9660 *iso9660, struct file_info *parent, const unsigned char *isodirrec); static void parse_rockridge(struct iso9660 *iso9660, struct file_info *file, const unsigned char *start, const unsigned char *end); static void parse_rockridge_NM1(struct file_info *, const unsigned char *, int); static void parse_rockridge_SL1(struct file_info *, const unsigned char *, int); static void parse_rockridge_TF1(struct file_info *, const unsigned char *, int); static void release_file(struct iso9660 *, struct file_info *); static unsigned toi(const void *p, int n); int archive_read_support_format_iso9660(struct archive *_a) { struct archive_read *a = (struct archive_read *)_a; struct iso9660 *iso9660; int r; iso9660 = (struct iso9660 *)malloc(sizeof(*iso9660)); if (iso9660 == NULL) { archive_set_error(&a->archive, ENOMEM, "Can't allocate iso9660 data"); return (ARCHIVE_FATAL); } memset(iso9660, 0, sizeof(*iso9660)); iso9660->magic = ISO9660_MAGIC; r = __archive_read_register_format(a, iso9660, archive_read_format_iso9660_bid, archive_read_format_iso9660_read_header, archive_read_format_iso9660_read_data, archive_read_format_iso9660_read_data_skip, archive_read_format_iso9660_cleanup); if (r != ARCHIVE_OK) { free(iso9660); return (r); } return (ARCHIVE_OK); } static int archive_read_format_iso9660_bid(struct archive_read *a) { struct iso9660 *iso9660; ssize_t bytes_read; const void *h; const unsigned char *p; int bid; iso9660 = (struct iso9660 *)(a->format->data); /* * Skip the first 32k (reserved area) and get the first * 8 sectors of the volume descriptor table. Of course, * if the I/O layer gives us more, we'll take it. */ h = __archive_read_ahead(a, 32768 + 8*2048, &bytes_read); if (h == NULL) return (-1); p = (const unsigned char *)h; /* Skip the reserved area. */ bytes_read -= 32768; p += 32768; /* Check each volume descriptor to locate the PVD. */ for (; bytes_read > 2048; bytes_read -= 2048, p += 2048) { bid = isPVD(iso9660, p); if (bid > 0) return (bid); if (*p == '\177') /* End-of-volume-descriptor marker. */ break; } /* We didn't find a valid PVD; return a bid of zero. */ return (0); } static int isPVD(struct iso9660 *iso9660, const unsigned char *h) { struct file_info *file; int i; /* Type of the Primary Volume Descriptor must be 1. */ if (h[PVD_type_offset] != 1) return (0); /* ID must be "CD001" */ if (memcmp(h + PVD_id_offset, "CD001", 5) != 0) return (0); /* PVD version must be 1. */ if (h[PVD_version_offset] != 1) return (0); /* Reserved field must be 0. */ if (h[PVD_reserved1_offset] != 0) return (0); /* Reserved field must be 0. */ for (i = 0; i < PVD_reserved2_size; ++i) if (h[PVD_reserved2_offset + i] != 0) return (0); /* Reserved field must be 0. */ for (i = 0; i < PVD_reserved3_size; ++i) if (h[PVD_reserved3_offset + i] != 0) return (0); /* Logical block size must be > 0. */ /* I've looked at Ecma 119 and can't find any stronger * restriction on this field. */ iso9660->logical_block_size = toi(h + PVD_logical_block_size_offset, 2); if (iso9660->logical_block_size <= 0) return (0); iso9660->volume_size = iso9660->logical_block_size * (uint64_t)toi(h + PVD_volume_space_size_offset, 4); /* File structure version must be 1 for ISO9660/ECMA119. */ if (h[PVD_file_structure_version_offset] != 1) return (0); /* Reserved field must be 0. */ for (i = 0; i < PVD_reserved4_size; ++i) if (h[PVD_reserved4_offset + i] != 0) return (0); /* Reserved field must be 0. */ for (i = 0; i < PVD_reserved5_size; ++i) if (h[PVD_reserved5_offset + i] != 0) return (0); /* XXX TODO: Check other values for sanity; reject more * malformed PVDs. XXX */ /* Store the root directory in the pending list. */ file = parse_file_info(iso9660, NULL, h + PVD_root_directory_record_offset); add_entry(iso9660, file); return (48); } static int archive_read_format_iso9660_read_header(struct archive_read *a, struct archive_entry *entry) { struct iso9660 *iso9660; struct file_info *file; int r; iso9660 = (struct iso9660 *)(a->format->data); if (!a->archive.archive_format) { a->archive.archive_format = ARCHIVE_FORMAT_ISO9660; a->archive.archive_format_name = "ISO9660"; } /* Get the next entry that appears after the current offset. */ r = next_entry_seek(a, iso9660, &file); if (r != ARCHIVE_OK) return (r); iso9660->entry_bytes_remaining = file->size; iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */ if (file->offset + file->size > iso9660->volume_size) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "File is beyond end-of-media: %s", file->name); iso9660->entry_bytes_remaining = 0; iso9660->entry_sparse_offset = 0; release_file(iso9660, file); return (ARCHIVE_WARN); } /* Set up the entry structure with information about this entry. */ archive_entry_set_mode(entry, file->mode); archive_entry_set_uid(entry, file->uid); archive_entry_set_gid(entry, file->gid); archive_entry_set_nlink(entry, file->nlinks); archive_entry_set_ino(entry, file->inode); archive_entry_set_birthtime(entry, file->birthtime, 0); archive_entry_set_mtime(entry, file->mtime, 0); archive_entry_set_ctime(entry, file->ctime, 0); archive_entry_set_atime(entry, file->atime, 0); /* N.B.: Rock Ridge supports 64-bit device numbers. */ archive_entry_set_rdev(entry, (dev_t)file->rdev); archive_entry_set_size(entry, iso9660->entry_bytes_remaining); archive_string_empty(&iso9660->pathname); archive_entry_set_pathname(entry, build_pathname(&iso9660->pathname, file)); if (file->symlink.s != NULL) archive_entry_copy_symlink(entry, file->symlink.s); /* If this entry points to the same data as the previous * entry, convert this into a hardlink to that entry. * But don't bother for zero-length files. */ if (file->offset == iso9660->previous_offset && file->size == iso9660->previous_size && file->size > 0) { archive_entry_set_hardlink(entry, iso9660->previous_pathname.s); iso9660->entry_bytes_remaining = 0; iso9660->entry_sparse_offset = 0; release_file(iso9660, file); return (ARCHIVE_OK); } /* If the offset is before our current position, we can't * seek backwards to extract it, so issue a warning. */ if (file->offset < iso9660->current_position) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Ignoring out-of-order file"); iso9660->entry_bytes_remaining = 0; iso9660->entry_sparse_offset = 0; release_file(iso9660, file); return (ARCHIVE_WARN); } iso9660->previous_size = file->size; iso9660->previous_offset = file->offset; archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s); /* If this is a directory, read in all of the entries right now. */ if (archive_entry_filetype(entry) == AE_IFDIR) { while (iso9660->entry_bytes_remaining > 0) { const void *block; const unsigned char *p; ssize_t step = iso9660->logical_block_size; if (step > iso9660->entry_bytes_remaining) step = iso9660->entry_bytes_remaining; block = __archive_read_ahead(a, step, NULL); if (block == NULL) { archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Failed to read full block when scanning ISO9660 directory list"); release_file(iso9660, file); return (ARCHIVE_FATAL); } __archive_read_consume(a, step); iso9660->current_position += step; iso9660->entry_bytes_remaining -= step; for (p = (const unsigned char *)block; *p != 0 && p < (const unsigned char *)block + step; p += *p) { struct file_info *child; /* Skip '.' entry. */ if (*(p + DR_name_len_offset) == 1 && *(p + DR_name_offset) == '\0') continue; /* Skip '..' entry. */ if (*(p + DR_name_len_offset) == 1 && *(p + DR_name_offset) == '\001') continue; child = parse_file_info(iso9660, file, p); add_entry(iso9660, child); if (iso9660->seenRockridge) { a->archive.archive_format = ARCHIVE_FORMAT_ISO9660_ROCKRIDGE; a->archive.archive_format_name = "ISO9660 with Rockridge extensions"; } } } } release_file(iso9660, file); return (ARCHIVE_OK); } static int archive_read_format_iso9660_read_data_skip(struct archive_read *a) { /* Because read_next_header always does an explicit skip * to the next entry, we don't need to do anything here. */ (void)a; /* UNUSED */ return (ARCHIVE_OK); } static int archive_read_format_iso9660_read_data(struct archive_read *a, const void **buff, size_t *size, off_t *offset) { ssize_t bytes_read; struct iso9660 *iso9660; iso9660 = (struct iso9660 *)(a->format->data); if (iso9660->entry_bytes_remaining <= 0) { *buff = NULL; *size = 0; *offset = iso9660->entry_sparse_offset; return (ARCHIVE_EOF); } *buff = __archive_read_ahead(a, 1, &bytes_read); if (bytes_read == 0) archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, "Truncated input file"); if (buff == NULL) return (ARCHIVE_FATAL); if (bytes_read > iso9660->entry_bytes_remaining) bytes_read = iso9660->entry_bytes_remaining; *size = bytes_read; *offset = iso9660->entry_sparse_offset; iso9660->entry_sparse_offset += bytes_read; iso9660->entry_bytes_remaining -= bytes_read; iso9660->current_position += bytes_read; __archive_read_consume(a, bytes_read); return (ARCHIVE_OK); } static int archive_read_format_iso9660_cleanup(struct archive_read *a) { struct iso9660 *iso9660; struct file_info *file; iso9660 = (struct iso9660 *)(a->format->data); while ((file = next_entry(iso9660)) != NULL) release_file(iso9660, file); archive_string_free(&iso9660->pathname); archive_string_free(&iso9660->previous_pathname); if (iso9660->pending_files) free(iso9660->pending_files); free(iso9660); (a->format->data) = NULL; return (ARCHIVE_OK); } /* * This routine parses a single ISO directory record, makes sense * of any extensions, and stores the result in memory. */ static struct file_info * parse_file_info(struct iso9660 *iso9660, struct file_info *parent, const unsigned char *isodirrec) { struct file_info *file; size_t name_len; const unsigned char *rr_start, *rr_end; const char *p; int flags; /* TODO: Sanity check that name_len doesn't exceed length, etc. */ /* Create a new file entry and copy data from the ISO dir record. */ file = (struct file_info *)malloc(sizeof(*file)); if (file == NULL) return (NULL); memset(file, 0, sizeof(*file)); file->parent = parent; if (parent != NULL) parent->refcount++; file->offset = toi(isodirrec + DR_extent_offset, DR_extent_size) * iso9660->logical_block_size; file->size = toi(isodirrec + DR_size_offset, DR_size_size); file->mtime = isodate7(isodirrec + DR_date_offset); file->ctime = file->atime = file->mtime; name_len = (size_t)*(const unsigned char *)(isodirrec + DR_name_len_offset); p = isodirrec + DR_name_offset; /* Rockridge extensions (if any) follow name. Compute this * before fidgeting the name_len below. */ rr_start = p + name_len + (name_len & 1 ? 0 : 1) + iso9660->suspOffset; rr_end = (const unsigned char *)isodirrec + *(isodirrec + DR_length_offset); /* Chop off trailing ';1' from files. */ if (name_len > 2 && p[name_len - 1] == '1' && p[name_len - 2] == ';') name_len -= 2; /* Chop off trailing '.' from filenames. */ if (name_len > 1 && p[name_len - 1] == '.') --name_len; archive_strncpy(&file->name, p, name_len); flags = *(isodirrec + DR_flags_offset); if (flags & 0x02) file->mode = AE_IFDIR | 0700; else file->mode = AE_IFREG | 0400; /* Rockridge extensions overwrite information from above. */ parse_rockridge(iso9660, file, rr_start, rr_end); #if DEBUG /* DEBUGGING: Warn about attributes I don't yet fully support. */ if ((flags & ~0x02) != 0) { fprintf(stderr, "\n ** Unrecognized flag: "); dump_isodirrec(stderr, isodirrec); fprintf(stderr, "\n"); } else if (toi(isodirrec + DR_volume_sequence_number_offset, 2) != 1) { fprintf(stderr, "\n ** Unrecognized sequence number: "); dump_isodirrec(stderr, isodirrec); fprintf(stderr, "\n"); } else if (*(isodirrec + DR_file_unit_size_offset) != 0) { fprintf(stderr, "\n ** Unexpected file unit size: "); dump_isodirrec(stderr, isodirrec); fprintf(stderr, "\n"); } else if (*(isodirrec + DR_interleave_offset) != 0) { fprintf(stderr, "\n ** Unexpected interleave: "); dump_isodirrec(stderr, isodirrec); fprintf(stderr, "\n"); } else if (*(isodirrec + DR_ext_attr_length_offset) != 0) { fprintf(stderr, "\n ** Unexpected extended attribute length: "); dump_isodirrec(stderr, isodirrec); fprintf(stderr, "\n"); } #endif return (file); } static void add_entry(struct iso9660 *iso9660, struct file_info *file) { /* Expand our pending files list as necessary. */ if (iso9660->pending_files_used >= iso9660->pending_files_allocated) { struct file_info **new_pending_files; int new_size = iso9660->pending_files_allocated * 2; if (iso9660->pending_files_allocated < 1024) new_size = 1024; /* Overflow might keep us from growing the list. */ if (new_size <= iso9660->pending_files_allocated) __archive_errx(1, "Out of memory"); new_pending_files = (struct file_info **)malloc(new_size * sizeof(new_pending_files[0])); if (new_pending_files == NULL) __archive_errx(1, "Out of memory"); memcpy(new_pending_files, iso9660->pending_files, iso9660->pending_files_allocated * sizeof(new_pending_files[0])); if (iso9660->pending_files != NULL) free(iso9660->pending_files); iso9660->pending_files = new_pending_files; iso9660->pending_files_allocated = new_size; } iso9660->pending_files[iso9660->pending_files_used++] = file; } static void parse_rockridge(struct iso9660 *iso9660, struct file_info *file, const unsigned char *p, const unsigned char *end) { (void)iso9660; /* UNUSED */ file->name_continues = 0; file->symlink_continues = 0; while (p + 4 < end /* Enough space for another entry. */ && p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */ && p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */ && p[2] >= 4 /* Sanity-check length. */ && p + p[2] <= end) { /* Sanity-check length. */ const unsigned char *data = p + 4; int data_length = p[2] - 4; int version = p[3]; /* * Yes, each 'if' here does test p[0] again. * Otherwise, the fall-through handling to catch * unsupported extensions doesn't work. */ switch(p[0]) { case 'C': if (p[0] == 'C' && p[1] == 'E') { if (version == 1 && data_length == 24) { /* * CE extension comprises: * 8 byte sector containing extension * 8 byte offset w/in above sector * 8 byte length of continuation */ file->ce_offset = (uint64_t)toi(data, 4) * iso9660->logical_block_size + toi(data + 8, 4); file->ce_size = toi(data + 16, 4); /* If the result is rediculous, * ignore it. */ if (file->ce_offset + file->ce_size > iso9660->volume_size) { file->ce_offset = 0; file->ce_size = 0; } } break; } /* FALLTHROUGH */ case 'N': if (p[0] == 'N' && p[1] == 'M') { if (version == 1) parse_rockridge_NM1(file, data, data_length); break; } /* FALLTHROUGH */ case 'P': if (p[0] == 'P' && p[1] == 'D') { /* * PD extension is padding; * contents are always ignored. */ break; } if (p[0] == 'P' && p[1] == 'N') { if (version == 1 && data_length == 16) { file->rdev = toi(data,4); file->rdev <<= 32; file->rdev |= toi(data + 8, 4); } break; } if (p[0] == 'P' && p[1] == 'X') { /* * PX extension comprises: * 8 bytes for mode, * 8 bytes for nlinks, * 8 bytes for uid, * 8 bytes for gid, * 8 bytes for inode. */ if (version == 1) { if (data_length >= 8) file->mode = toi(data, 4); if (data_length >= 16) file->nlinks = toi(data + 8, 4); if (data_length >= 24) file->uid = toi(data + 16, 4); if (data_length >= 32) file->gid = toi(data + 24, 4); if (data_length >= 40) file->inode = toi(data + 32, 4); } break; } /* FALLTHROUGH */ case 'R': if (p[0] == 'R' && p[1] == 'R' && version == 1) { iso9660->seenRockridge = 1; /* * RR extension comprises: * one byte flag value */ /* TODO: Handle RR extension. */ break; } /* FALLTHROUGH */ case 'S': if (p[0] == 'S' && p[1] == 'L') { if (version == 1) parse_rockridge_SL1(file, data, data_length); break; } if (p[0] == 'S' && p[1] == 'P' && version == 1 && data_length == 3 && data[0] == (unsigned char)'\xbe' && data[1] == (unsigned char)'\xef') { /* * SP extension stores the suspOffset * (Number of bytes to skip between * filename and SUSP records.) * It is mandatory by the SUSP standard * (IEEE 1281). * * It allows SUSP to coexist with * non-SUSP uses of the System * Use Area by placing non-SUSP data * before SUSP data. * * TODO: Add a check for 'SP' in * first directory entry, disable all SUSP * processing if not found. */ iso9660->suspOffset = data[2]; break; } if (p[0] == 'S' && p[1] == 'T' && data_length == 0 && version == 1) { /* * ST extension marks end of this * block of SUSP entries. * * It allows SUSP to coexist with * non-SUSP uses of the System * Use Area by placing non-SUSP data * after SUSP data. */ return; } case 'T': if (p[0] == 'T' && p[1] == 'F') { if (version == 1) parse_rockridge_TF1(file, data, data_length); break; } /* FALLTHROUGH */ default: /* The FALLTHROUGHs above leave us here for * any unsupported extension. */ #if DEBUG { const unsigned char *t; fprintf(stderr, "\nUnsupported RRIP extension for %s\n", file->name.s); fprintf(stderr, " %c%c(%d):", p[0], p[1], data_length); for (t = data; t < data + data_length && t < data + 16; t++) fprintf(stderr, " %02x", *t); fprintf(stderr, "\n"); } #endif break; } p += p[2]; } } static void parse_rockridge_NM1(struct file_info *file, const unsigned char *data, int data_length) { if (!file->name_continues) archive_string_empty(&file->name); file->name_continues = 0; if (data_length < 1) return; /* * NM version 1 extension comprises: * 1 byte flag, value is one of: * = 0: remainder is name * = 1: remainder is name, next NM entry continues name * = 2: "." * = 4: ".." * = 32: Implementation specific * All other values are reserved. */ switch(data[0]) { case 0: if (data_length < 2) return; archive_strncat(&file->name, data + 1, data_length - 1); break; case 1: if (data_length < 2) return; archive_strncat(&file->name, data + 1, data_length - 1); file->name_continues = 1; break; case 2: archive_strcat(&file->name, "."); break; case 4: archive_strcat(&file->name, ".."); break; default: return; } } static void parse_rockridge_TF1(struct file_info *file, const unsigned char *data, int data_length) { char flag; /* * TF extension comprises: * one byte flag * create time (optional) * modify time (optional) * access time (optional) * attribute time (optional) * Time format and presence of fields * is controlled by flag bits. */ if (data_length < 1) return; flag = data[0]; ++data; --data_length; if (flag & 0x80) { /* Use 17-byte time format. */ if ((flag & 1) && data_length >= 17) { /* Create time. */ file->birthtime = isodate17(data); data += 17; data_length -= 17; } if ((flag & 2) && data_length >= 17) { /* Modify time. */ file->mtime = isodate17(data); data += 17; data_length -= 17; } if ((flag & 4) && data_length >= 17) { /* Access time. */ file->atime = isodate17(data); data += 17; data_length -= 17; } if ((flag & 8) && data_length >= 17) { /* Attribute change time. */ file->ctime = isodate17(data); data += 17; data_length -= 17; } } else { /* Use 7-byte time format. */ if ((flag & 1) && data_length >= 7) { /* Create time. */ file->birthtime = isodate17(data); data += 7; data_length -= 7; } if ((flag & 2) && data_length >= 7) { /* Modify time. */ file->mtime = isodate7(data); data += 7; data_length -= 7; } if ((flag & 4) && data_length >= 7) { /* Access time. */ file->atime = isodate7(data); data += 7; data_length -= 7; } if ((flag & 8) && data_length >= 7) { /* Attribute change time. */ file->ctime = isodate7(data); data += 7; data_length -= 7; } } } static void parse_rockridge_SL1(struct file_info *file, const unsigned char *data, int data_length) { int component_continues = 1; if (!file->symlink_continues) archive_string_empty(&file->symlink); else archive_strcat(&file->symlink, "/"); file->symlink_continues = 0; /* * Defined flag values: * 0: This is the last SL record for this symbolic link * 1: this symbolic link field continues in next SL entry * All other values are reserved. */ if (data_length < 1) return; switch(*data) { case 0: break; case 1: file->symlink_continues = 1; break; default: return; } ++data; /* Skip flag byte. */ --data_length; /* * SL extension body stores "components". * Basically, this is a complicated way of storing * a POSIX path. It also interferes with using * symlinks for storing non-path data. * * Each component is 2 bytes (flag and length) * possibly followed by name data. */ while (data_length >= 2) { unsigned char flag = *data++; unsigned char nlen = *data++; data_length -= 2; if (!component_continues) archive_strcat(&file->symlink, "/"); component_continues = 0; switch(flag) { case 0: /* Usual case, this is text. */ if (data_length < nlen) return; archive_strncat(&file->symlink, (const char *)data, nlen); break; case 0x01: /* Text continues in next component. */ if (data_length < nlen) return; archive_strncat(&file->symlink, (const char *)data, nlen); component_continues = 1; break; case 0x02: /* Current dir. */ archive_strcat(&file->symlink, "."); break; case 0x04: /* Parent dir. */ archive_strcat(&file->symlink, ".."); break; case 0x08: /* Root of filesystem. */ archive_string_empty(&file->symlink); archive_strcat(&file->symlink, "/"); break; case 0x10: /* Undefined (historically "volume root" */ archive_string_empty(&file->symlink); archive_strcat(&file->symlink, "ROOT"); break; case 0x20: /* Undefined (historically "hostname") */ archive_strcat(&file->symlink, "hostname"); break; default: /* TODO: issue a warning ? */ return; } data += nlen; data_length -= nlen; } } static void release_file(struct iso9660 *iso9660, struct file_info *file) { struct file_info *parent; if (file->refcount == 0) { parent = file->parent; archive_string_free(&file->name); archive_string_free(&file->symlink); free(file); if (parent != NULL) { parent->refcount--; release_file(iso9660, parent); } } } static int next_entry_seek(struct archive_read *a, struct iso9660 *iso9660, struct file_info **pfile) { struct file_info *file; uint64_t offset; *pfile = NULL; for (;;) { *pfile = file = next_entry(iso9660); if (file == NULL) return (ARCHIVE_EOF); /* CE area precedes actual file data? Ignore it. */ if (file->ce_offset > file->offset) { /* fprintf(stderr, " *** Discarding CE data.\n"); */ file->ce_offset = 0; file->ce_size = 0; } /* Don't waste time seeking for zero-length bodies. */ if (file->size == 0) { file->offset = iso9660->current_position; } /* If CE exists, find and read it now. */ if (file->ce_offset > 0) offset = file->ce_offset; else offset = file->offset; /* Seek forward to the start of the entry. */ if (iso9660->current_position < offset) { off_t step = offset - iso9660->current_position; off_t bytes_read; bytes_read = __archive_read_skip(a, step); if (bytes_read < 0) return (bytes_read); iso9660->current_position = offset; } /* We found body of file; handle it now. */ if (offset == file->offset) return (ARCHIVE_OK); /* Found CE? Process it and push the file back onto list. */ if (offset == file->ce_offset) { const void *p; ssize_t size = file->ce_size; const unsigned char *rr_start; file->ce_offset = 0; file->ce_size = 0; p = __archive_read_ahead(a, size, NULL); if (p == NULL) return (ARCHIVE_FATAL); rr_start = (const unsigned char *)p; parse_rockridge(iso9660, file, rr_start, rr_start + size); __archive_read_consume(a, size); iso9660->current_position += size; add_entry(iso9660, file); } } } static struct file_info * next_entry(struct iso9660 *iso9660) { int least_index; uint64_t least_end_offset; int i; struct file_info *r; if (iso9660->pending_files_used < 1) return (NULL); /* Assume the first file in the list is the earliest on disk. */ least_index = 0; least_end_offset = iso9660->pending_files[0]->offset + iso9660->pending_files[0]->size; /* Now, try to find an earlier one. */ for (i = 0; i < iso9660->pending_files_used; i++) { /* Use the position of the file *end* as our comparison. */ uint64_t end_offset = iso9660->pending_files[i]->offset + iso9660->pending_files[i]->size; if (iso9660->pending_files[i]->ce_offset > 0 && iso9660->pending_files[i]->ce_offset < iso9660->pending_files[i]->offset) end_offset = iso9660->pending_files[i]->ce_offset + iso9660->pending_files[i]->ce_size; if (least_end_offset > end_offset) { least_index = i; least_end_offset = end_offset; } } r = iso9660->pending_files[least_index]; iso9660->pending_files[least_index] = iso9660->pending_files[--iso9660->pending_files_used]; return (r); } static unsigned int toi(const void *p, int n) { const unsigned char *v = (const unsigned char *)p; if (n > 1) return v[0] + 256 * toi(v + 1, n - 1); if (n == 1) return v[0]; return (0); } static time_t isodate7(const unsigned char *v) { struct tm tm; int offset; memset(&tm, 0, sizeof(tm)); tm.tm_year = v[0]; tm.tm_mon = v[1] - 1; tm.tm_mday = v[2]; tm.tm_hour = v[3]; tm.tm_min = v[4]; tm.tm_sec = v[5]; /* v[6] is the signed timezone offset, in 1/4-hour increments. */ offset = ((const signed char *)v)[6]; if (offset > -48 && offset < 52) { tm.tm_hour -= offset / 4; tm.tm_min -= (offset % 4) * 15; } return (time_from_tm(&tm)); } static time_t isodate17(const unsigned char *v) { struct tm tm; int offset; memset(&tm, 0, sizeof(tm)); tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100 + (v[2] - '0') * 10 + (v[3] - '0') - 1900; tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0'); tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0'); tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0'); tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0'); tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0'); /* v[16] is the signed timezone offset, in 1/4-hour increments. */ offset = ((const signed char *)v)[16]; if (offset > -48 && offset < 52) { tm.tm_hour -= offset / 4; tm.tm_min -= (offset % 4) * 15; } return (time_from_tm(&tm)); } static time_t time_from_tm(struct tm *t) { #if HAVE_TIMEGM /* Use platform timegm() if available. */ return (timegm(t)); #else /* Else use direct calculation using POSIX assumptions. */ /* First, fix up tm_yday based on the year/month/day. */ mktime(t); /* Then we can compute timegm() from first principles. */ return (t->tm_sec + t->tm_min * 60 + t->tm_hour * 3600 + t->tm_yday * 86400 + (t->tm_year - 70) * 31536000 + ((t->tm_year - 69) / 4) * 86400 - ((t->tm_year - 1) / 100) * 86400 + ((t->tm_year + 299) / 400) * 86400); #endif } static const char * build_pathname(struct archive_string *as, struct file_info *file) { if (file->parent != NULL && archive_strlen(&file->parent->name) > 0) { build_pathname(as, file->parent); archive_strcat(as, "/"); } if (archive_strlen(&file->name) == 0) archive_strcat(as, "."); else archive_string_concat(as, &file->name); return (as->s); } #if DEBUG static void dump_isodirrec(FILE *out, const unsigned char *isodirrec) { fprintf(out, " l %d,", toi(isodirrec + DR_length_offset, DR_length_size)); fprintf(out, " a %d,", toi(isodirrec + DR_ext_attr_length_offset, DR_ext_attr_length_size)); fprintf(out, " ext 0x%x,", toi(isodirrec + DR_extent_offset, DR_extent_size)); fprintf(out, " s %d,", toi(isodirrec + DR_size_offset, DR_extent_size)); fprintf(out, " f 0x%02x,", toi(isodirrec + DR_flags_offset, DR_flags_size)); fprintf(out, " u %d,", toi(isodirrec + DR_file_unit_size_offset, DR_file_unit_size_size)); fprintf(out, " ilv %d,", toi(isodirrec + DR_interleave_offset, DR_interleave_size)); fprintf(out, " seq %d,", toi(isodirrec + DR_volume_sequence_number_offset, DR_volume_sequence_number_size)); fprintf(out, " nl %d:", toi(isodirrec + DR_name_len_offset, DR_name_len_size)); fprintf(out, " `%.*s'", toi(isodirrec + DR_name_len_offset, DR_name_len_size), isodirrec + DR_name_offset); } #endif