| 1 | /* vi: set sw=4 ts=4: */
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| 2 | #ifndef UNARCHIVE_H
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| 3 | #define UNARCHIVE_H 1
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| 4 |
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| 5 | PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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| 6 |
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| 7 | enum {
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| 8 | #if BB_BIG_ENDIAN
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| 9 | COMPRESS_MAGIC = 0x1f9d,
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| 10 | GZIP_MAGIC = 0x1f8b,
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| 11 | BZIP2_MAGIC = 256 * 'B' + 'Z',
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| 12 | /* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
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| 13 | /* More info at: http://tukaani.org/xz/xz-file-format.txt */
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| 14 | XZ_MAGIC1 = 256 * 0xfd + '7',
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| 15 | XZ_MAGIC2 = 256 * (unsigned)(256 * (256 * 'z' + 'X') + 'Z') + 0,
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| 16 | /* Different form: 32 bits, then 16 bits: */
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| 17 | /* (unsigned) cast suppresses "integer overflow in expression" warning */
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| 18 | XZ_MAGIC1a = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X',
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| 19 | XZ_MAGIC2a = 256 * 'Z' + 0,
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| 20 | #else
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| 21 | COMPRESS_MAGIC = 0x9d1f,
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| 22 | GZIP_MAGIC = 0x8b1f,
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| 23 | BZIP2_MAGIC = 'B' + 'Z' * 256,
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| 24 | XZ_MAGIC1 = 0xfd + '7' * 256,
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| 25 | XZ_MAGIC2 = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256,
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| 26 | XZ_MAGIC1a = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256,
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| 27 | XZ_MAGIC2a = 'Z' + 0 * 256,
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| 28 | #endif
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| 29 | };
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| 30 |
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| 31 | typedef struct file_header_t {
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| 32 | char *name;
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| 33 | char *link_target;
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| 34 | #if ENABLE_FEATURE_TAR_UNAME_GNAME
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| 35 | char *tar__uname;
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| 36 | char *tar__gname;
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| 37 | #endif
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| 38 | off_t size;
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| 39 | uid_t uid;
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| 40 | gid_t gid;
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| 41 | mode_t mode;
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| 42 | time_t mtime;
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| 43 | dev_t device;
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| 44 | } file_header_t;
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| 45 |
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| 46 | struct hardlinks_t;
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| 47 |
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| 48 | typedef struct archive_handle_t {
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| 49 | /* Flags. 1st since it is most used member */
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| 50 | unsigned ah_flags;
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| 51 |
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| 52 | /* The raw stream as read from disk or stdin */
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| 53 | int src_fd;
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| 54 |
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| 55 | /* Define if the header and data component should be processed */
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| 56 | char FAST_FUNC (*filter)(struct archive_handle_t *);
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| 57 | /* List of files that have been accepted */
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| 58 | llist_t *accept;
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| 59 | /* List of files that have been rejected */
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| 60 | llist_t *reject;
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| 61 | /* List of files that have successfully been worked on */
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| 62 | llist_t *passed;
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| 63 |
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| 64 | /* Currently processed file's header */
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| 65 | file_header_t *file_header;
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| 66 |
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| 67 | /* Process the header component, e.g. tar -t */
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| 68 | void FAST_FUNC (*action_header)(const file_header_t *);
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| 69 |
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| 70 | /* Process the data component, e.g. extract to filesystem */
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| 71 | void FAST_FUNC (*action_data)(struct archive_handle_t *);
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| 72 |
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| 73 | /* Function that skips data */
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| 74 | void FAST_FUNC (*seek)(int fd, off_t amount);
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| 75 |
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| 76 | /* Count processed bytes */
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| 77 | off_t offset;
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| 78 |
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| 79 | /* Archiver specific. Can make it a union if it ever gets big */
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| 80 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS
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| 81 | unsigned tar__strip_components;
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| 82 | #endif
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| 83 | #define PAX_NEXT_FILE 0
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| 84 | #define PAX_GLOBAL 1
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| 85 | #if ENABLE_TAR || ENABLE_DPKG || ENABLE_DPKG_DEB
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| 86 | smallint tar__end;
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| 87 | # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
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| 88 | char* tar__longname;
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| 89 | char* tar__linkname;
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| 90 | # endif
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| 91 | # if ENABLE_FEATURE_TAR_TO_COMMAND
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| 92 | char* tar__to_command;
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| 93 | const char* tar__to_command_shell;
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| 94 | # endif
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| 95 | # if ENABLE_FEATURE_TAR_SELINUX
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| 96 | char* tar__sctx[2];
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| 97 | # endif
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| 98 | #endif
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| 99 | #if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM
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| 100 | uoff_t cpio__blocks;
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| 101 | struct bb_uidgid_t cpio__owner;
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| 102 | struct hardlinks_t *cpio__hardlinks_to_create;
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| 103 | struct hardlinks_t *cpio__created_hardlinks;
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| 104 | #endif
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| 105 | #if ENABLE_DPKG || ENABLE_DPKG_DEB
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| 106 | /* Temporary storage */
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| 107 | char *dpkg__buffer;
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| 108 | /* How to process any sub archive, e.g. get_header_tar_gz */
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| 109 | char FAST_FUNC (*dpkg__action_data_subarchive)(struct archive_handle_t *);
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| 110 | /* Contains the handle to a sub archive */
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| 111 | struct archive_handle_t *dpkg__sub_archive;
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| 112 | #endif
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| 113 | #if ENABLE_FEATURE_AR_CREATE
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| 114 | const char *ar__name;
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| 115 | struct archive_handle_t *ar__out;
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| 116 | #endif
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| 117 | } archive_handle_t;
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| 118 | /* bits in ah_flags */
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| 119 | #define ARCHIVE_RESTORE_DATE (1 << 0)
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| 120 | #define ARCHIVE_CREATE_LEADING_DIRS (1 << 1)
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| 121 | #define ARCHIVE_UNLINK_OLD (1 << 2)
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| 122 | #define ARCHIVE_EXTRACT_QUIET (1 << 3)
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| 123 | #define ARCHIVE_EXTRACT_NEWER (1 << 4)
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| 124 | #define ARCHIVE_DONT_RESTORE_OWNER (1 << 5)
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| 125 | #define ARCHIVE_DONT_RESTORE_PERM (1 << 6)
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| 126 | #define ARCHIVE_NUMERIC_OWNER (1 << 7)
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| 127 | #define ARCHIVE_O_TRUNC (1 << 8)
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| 128 | #define ARCHIVE_REMEMBER_NAMES (1 << 9)
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| 129 | #if ENABLE_RPM
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| 130 | #define ARCHIVE_REPLACE_VIA_RENAME (1 << 10)
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| 131 | #endif
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| 132 |
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| 133 |
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| 134 | /* POSIX tar Header Block, from POSIX 1003.1-1990 */
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| 135 | #define TAR_BLOCK_SIZE 512
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| 136 | #define NAME_SIZE 100
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| 137 | #define NAME_SIZE_STR "100"
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| 138 | typedef struct tar_header_t { /* byte offset */
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| 139 | char name[NAME_SIZE]; /* 0-99 */
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| 140 | char mode[8]; /* 100-107 */
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| 141 | char uid[8]; /* 108-115 */
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| 142 | char gid[8]; /* 116-123 */
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| 143 | char size[12]; /* 124-135 */
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| 144 | char mtime[12]; /* 136-147 */
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| 145 | char chksum[8]; /* 148-155 */
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| 146 | char typeflag; /* 156-156 */
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| 147 | char linkname[NAME_SIZE]; /* 157-256 */
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| 148 | /* POSIX: "ustar" NUL "00" */
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| 149 | /* GNU tar: "ustar " NUL */
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| 150 | /* Normally it's defined as magic[6] followed by
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| 151 | * version[2], but we put them together to save code.
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| 152 | */
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| 153 | char magic[8]; /* 257-264 */
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| 154 | char uname[32]; /* 265-296 */
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| 155 | char gname[32]; /* 297-328 */
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| 156 | char devmajor[8]; /* 329-336 */
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| 157 | char devminor[8]; /* 337-344 */
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| 158 | char prefix[155]; /* 345-499 */
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| 159 | char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
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| 160 | } tar_header_t;
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| 161 | struct BUG_tar_header {
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| 162 | char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1];
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| 163 | };
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| 164 |
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| 165 |
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| 166 | extern const char cpio_TRAILER[];
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| 167 |
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| 168 |
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| 169 | archive_handle_t *init_handle(void) FAST_FUNC;
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| 170 |
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| 171 | char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
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| 172 | char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC;
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| 173 | char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC;
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| 174 | char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC;
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| 175 |
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| 176 | void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC;
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| 177 |
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| 178 | void data_skip(archive_handle_t *archive_handle) FAST_FUNC;
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| 179 | void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC;
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| 180 | void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC;
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| 181 | void data_extract_to_command(archive_handle_t *archive_handle) FAST_FUNC;
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| 182 |
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| 183 | void header_skip(const file_header_t *file_header) FAST_FUNC;
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| 184 | void header_list(const file_header_t *file_header) FAST_FUNC;
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| 185 | void header_verbose_list(const file_header_t *file_header) FAST_FUNC;
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| 186 |
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| 187 | char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC;
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| 188 | char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC;
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| 189 | char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC;
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| 190 | char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
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| 191 | char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC;
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| 192 | char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC;
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| 193 | char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
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| 194 |
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| 195 | void seek_by_jump(int fd, off_t amount) FAST_FUNC;
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| 196 | void seek_by_read(int fd, off_t amount) FAST_FUNC;
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| 197 |
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| 198 | const char *strip_unsafe_prefix(const char *str) FAST_FUNC;
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| 199 |
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| 200 | void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC;
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| 201 | const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC;
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| 202 | const llist_t *find_list_entry2(const llist_t *list, const char *filename) FAST_FUNC;
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| 203 |
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| 204 | /* A bit of bunzip2 internals are exposed for compressed help support: */
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| 205 | typedef struct bunzip_data bunzip_data;
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| 206 | int start_bunzip(bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_FUNC;
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| 207 | /* NB: read_bunzip returns < 0 on error, or the number of *unfilled* bytes
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| 208 | * in outbuf. IOW: on EOF returns len ("all bytes are not filled"), not 0: */
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| 209 | int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
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| 210 | void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
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| 211 |
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| 212 | /* Meaning and direction (input/output) of the fields are transformer-specific */
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| 213 | typedef struct transformer_state_t {
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| 214 | smallint signature_skipped; /* most often referenced member */
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| 215 |
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| 216 | IF_DESKTOP(long long) int FAST_FUNC (*xformer)(struct transformer_state_t *xstate);
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| 217 | USE_FOR_NOMMU(const char *xformer_prog;)
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| 218 |
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| 219 | /* Source */
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| 220 | int src_fd;
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| 221 | /* Output */
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| 222 | int dst_fd;
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| 223 | size_t mem_output_size_max; /* if non-zero, decompress to RAM instead of fd */
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| 224 | size_t mem_output_size;
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| 225 | char *mem_output_buf;
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| 226 |
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| 227 | off_t bytes_out;
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| 228 | off_t bytes_in; /* used in unzip code only: needs to know packed size */
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| 229 | uint32_t crc32;
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| 230 | time_t mtime; /* gunzip code may set this on exit */
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| 231 | } transformer_state_t;
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| 232 |
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| 233 | void init_transformer_state(transformer_state_t *xstate) FAST_FUNC;
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| 234 | ssize_t transformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
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| 235 | ssize_t xtransformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
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| 236 | int check_signature16(transformer_state_t *xstate, unsigned magic16) FAST_FUNC;
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| 237 |
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| 238 | IF_DESKTOP(long long) int inflate_unzip(transformer_state_t *xstate) FAST_FUNC;
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| 239 | IF_DESKTOP(long long) int unpack_Z_stream(transformer_state_t *xstate) FAST_FUNC;
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| 240 | IF_DESKTOP(long long) int unpack_gz_stream(transformer_state_t *xstate) FAST_FUNC;
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| 241 | IF_DESKTOP(long long) int unpack_bz2_stream(transformer_state_t *xstate) FAST_FUNC;
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| 242 | IF_DESKTOP(long long) int unpack_lzma_stream(transformer_state_t *xstate) FAST_FUNC;
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| 243 | IF_DESKTOP(long long) int unpack_xz_stream(transformer_state_t *xstate) FAST_FUNC;
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| 244 |
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| 245 | char* append_ext(char *filename, const char *expected_ext) FAST_FUNC;
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| 246 | int bbunpack(char **argv,
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| 247 | IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
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| 248 | char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
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| 249 | const char *expected_ext
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| 250 | ) FAST_FUNC;
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| 251 |
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| 252 | void check_errors_in_children(int signo);
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| 253 | #if BB_MMU
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| 254 | void fork_transformer(int fd,
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| 255 | int signature_skipped,
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| 256 | IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate)
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| 257 | ) FAST_FUNC;
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| 258 | #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), 0, (transformer))
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| 259 | #define fork_transformer_with_no_sig(fd, transformer) fork_transformer((fd), 1, (transformer))
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| 260 | #else
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| 261 | void fork_transformer(int fd, const char *transform_prog) FAST_FUNC;
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| 262 | #define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), (transform_prog))
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| 263 | /* fork_transformer_with_no_sig() does not exist on NOMMU */
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| 264 | #endif
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| 265 |
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| 266 |
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| 267 | POP_SAVED_FUNCTION_VISIBILITY
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| 268 |
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| 269 | #endif
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