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busybox/include/bb_archive.h
Denys Vlasenko bc9bbeb2b8 libarchive: do not extract unsafe symlinks unless $EXTRACT_UNSAFE_SYMLINKS=1 
function                                             old     new   delta
unsafe_symlink_target                                  -     147    +147
unzip_main                                          2711    2732     +21
copy_file                                           1657    1678     +21
tar_main                                             999     971     -28
data_extract_all                                    1038     984     -54
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 2/2 up/down: 189/-82)           Total: 107 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-10 11:52:42 +02:00

272 lines
9.7 KiB
C
Raw Blame History

/* vi: set sw=4 ts=4: */
#ifndef UNARCHIVE_H
#define UNARCHIVE_H 1
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
enum {
#if BB_BIG_ENDIAN
COMPRESS_MAGIC = 0x1f9d,
GZIP_MAGIC = 0x1f8b,
BZIP2_MAGIC = 256 * 'B' + 'Z',
/* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
/* More info at: http://tukaani.org/xz/xz-file-format.txt */
XZ_MAGIC1 = 256 * 0xfd + '7',
XZ_MAGIC2 = 256 * (unsigned)(256 * (256 * 'z' + 'X') + 'Z') + 0,
/* Different form: 32 bits, then 16 bits: */
/* (unsigned) cast suppresses "integer overflow in expression" warning */
XZ_MAGIC1a = 256 * (unsigned)(256 * (256 * 0xfd + '7') + 'z') + 'X',
XZ_MAGIC2a = 256 * 'Z' + 0,
#else
COMPRESS_MAGIC = 0x9d1f,
GZIP_MAGIC = 0x8b1f,
BZIP2_MAGIC = 'B' + 'Z' * 256,
XZ_MAGIC1 = 0xfd + '7' * 256,
XZ_MAGIC2 = 'z' + ('X' + ('Z' + 0 * 256) * 256) * 256,
XZ_MAGIC1a = 0xfd + ('7' + ('z' + 'X' * 256) * 256) * 256,
XZ_MAGIC2a = 'Z' + 0 * 256,
#endif
};
typedef struct file_header_t {
char *name;
char *link_target;
#if ENABLE_FEATURE_TAR_UNAME_GNAME
char *tar__uname;
char *tar__gname;
#endif
off_t size;
uid_t uid;
gid_t gid;
mode_t mode;
time_t mtime;
dev_t device;
} file_header_t;
struct hardlinks_t;
typedef struct archive_handle_t {
/* Flags. 1st since it is most used member */
unsigned ah_flags;
/* The raw stream as read from disk or stdin */
int src_fd;
/* Define if the header and data component should be processed */
char FAST_FUNC (*filter)(struct archive_handle_t *);
/* List of files that have been accepted */
llist_t *accept;
/* List of files that have been rejected */
llist_t *reject;
/* List of files that have successfully been worked on */
llist_t *passed;
/* Currently processed file's header */
file_header_t *file_header;
/* Process the header component, e.g. tar -t */
void FAST_FUNC (*action_header)(const file_header_t *);
/* Process the data component, e.g. extract to filesystem */
void FAST_FUNC (*action_data)(struct archive_handle_t *);
/* Function that skips data */
void FAST_FUNC (*seek)(int fd, off_t amount);
/* Count processed bytes */
off_t offset;
/* Archiver specific. Can make it a union if it ever gets big */
#if ENABLE_FEATURE_TAR_LONG_OPTIONS
unsigned tar__strip_components;
#endif
#define PAX_NEXT_FILE 0
#define PAX_GLOBAL 1
#if ENABLE_TAR || ENABLE_DPKG || ENABLE_DPKG_DEB
smallint tar__end;
# if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
char* tar__longname;
char* tar__linkname;
# endif
# if ENABLE_FEATURE_TAR_TO_COMMAND
char* tar__to_command;
const char* tar__to_command_shell;
# endif
# if ENABLE_FEATURE_TAR_SELINUX
char* tar__sctx[2];
# endif
#endif
#if ENABLE_CPIO || ENABLE_RPM2CPIO || ENABLE_RPM
uoff_t cpio__blocks;
struct bb_uidgid_t cpio__owner;
struct hardlinks_t *cpio__hardlinks_to_create;
struct hardlinks_t *cpio__created_hardlinks;
#endif
#if ENABLE_DPKG || ENABLE_DPKG_DEB
/* Temporary storage */
char *dpkg__buffer;
/* How to process any sub archive, e.g. get_header_tar_gz */
char FAST_FUNC (*dpkg__action_data_subarchive)(struct archive_handle_t *);
/* Contains the handle to a sub archive */
struct archive_handle_t *dpkg__sub_archive;
#endif
#if ENABLE_FEATURE_AR_CREATE
const char *ar__name;
struct archive_handle_t *ar__out;
#endif
} archive_handle_t;
/* bits in ah_flags */
#define ARCHIVE_RESTORE_DATE (1 << 0)
#define ARCHIVE_CREATE_LEADING_DIRS (1 << 1)
#define ARCHIVE_UNLINK_OLD (1 << 2)
#define ARCHIVE_EXTRACT_QUIET (1 << 3)
#define ARCHIVE_EXTRACT_NEWER (1 << 4)
#define ARCHIVE_DONT_RESTORE_OWNER (1 << 5)
#define ARCHIVE_DONT_RESTORE_PERM (1 << 6)
#define ARCHIVE_NUMERIC_OWNER (1 << 7)
#define ARCHIVE_O_TRUNC (1 << 8)
#define ARCHIVE_REMEMBER_NAMES (1 << 9)
#if ENABLE_RPM
#define ARCHIVE_REPLACE_VIA_RENAME (1 << 10)
#endif
/* POSIX tar Header Block, from POSIX 1003.1-1990 */
#define TAR_BLOCK_SIZE 512
#define NAME_SIZE 100
#define NAME_SIZE_STR "100"
typedef struct tar_header_t { /* byte offset */
char name[NAME_SIZE]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
char chksum[8]; /* 148-155 */
char typeflag; /* 156-156 */
char linkname[NAME_SIZE]; /* 157-256 */
/* POSIX: "ustar" NUL "00" */
/* GNU tar: "ustar " NUL */
/* Normally it's defined as magic[6] followed by
* version[2], but we put them together to save code.
*/
char magic[8]; /* 257-264 */
char uname[32]; /* 265-296 */
char gname[32]; /* 297-328 */
char devmajor[8]; /* 329-336 */
char devminor[8]; /* 337-344 */
char prefix[155]; /* 345-499 */
char padding[12]; /* 500-512 (pad to exactly TAR_BLOCK_SIZE) */
} tar_header_t;
struct BUG_tar_header {
char c[sizeof(tar_header_t) == TAR_BLOCK_SIZE ? 1 : -1];
};
extern const char cpio_TRAILER[];
archive_handle_t *init_handle(void) FAST_FUNC;
char filter_accept_all(archive_handle_t *archive_handle) FAST_FUNC;
char filter_accept_list(archive_handle_t *archive_handle) FAST_FUNC;
char filter_accept_list_reassign(archive_handle_t *archive_handle) FAST_FUNC;
char filter_accept_reject_list(archive_handle_t *archive_handle) FAST_FUNC;
void unpack_ar_archive(archive_handle_t *ar_archive) FAST_FUNC;
void data_skip(archive_handle_t *archive_handle) FAST_FUNC;
void data_extract_all(archive_handle_t *archive_handle) FAST_FUNC;
void data_extract_to_stdout(archive_handle_t *archive_handle) FAST_FUNC;
void data_extract_to_command(archive_handle_t *archive_handle) FAST_FUNC;
void header_skip(const file_header_t *file_header) FAST_FUNC;
void header_list(const file_header_t *file_header) FAST_FUNC;
void header_verbose_list(const file_header_t *file_header) FAST_FUNC;
char get_header_ar(archive_handle_t *archive_handle) FAST_FUNC;
char get_header_cpio(archive_handle_t *archive_handle) FAST_FUNC;
char get_header_tar(archive_handle_t *archive_handle) FAST_FUNC;
char get_header_tar_gz(archive_handle_t *archive_handle) FAST_FUNC;
char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
char get_header_tar_bz2(archive_handle_t *archive_handle) FAST_FUNC;
char get_header_tar_lzma(archive_handle_t *archive_handle) FAST_FUNC;
char get_header_tar_xz(archive_handle_t *archive_handle) FAST_FUNC;
void seek_by_jump(int fd, off_t amount) FAST_FUNC;
void seek_by_read(int fd, off_t amount) FAST_FUNC;
const char *strip_unsafe_prefix(const char *str) FAST_FUNC;
int unsafe_symlink_target(const char *target) FAST_FUNC;
void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC;
const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC;
const llist_t *find_list_entry2(const llist_t *list, const char *filename) FAST_FUNC;
/* A bit of bunzip2 internals are exposed for compressed help support: */
typedef struct bunzip_data bunzip_data;
int start_bunzip(bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_FUNC;
/* NB: read_bunzip returns < 0 on error, or the number of *unfilled* bytes
* in outbuf. IOW: on EOF returns len ("all bytes are not filled"), not 0: */
int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
/* Meaning and direction (input/output) of the fields are transformer-specific */
typedef struct transformer_state_t {
smallint signature_skipped; /* most often referenced member */
IF_DESKTOP(long long) int FAST_FUNC (*xformer)(struct transformer_state_t *xstate);
USE_FOR_NOMMU(const char *xformer_prog;)
/* Source */
int src_fd;
/* Output */
int dst_fd;
size_t mem_output_size_max; /* if non-zero, decompress to RAM instead of fd */
size_t mem_output_size;
char *mem_output_buf;
off_t bytes_out;
off_t bytes_in; /* used in unzip code only: needs to know packed size */
uint32_t crc32;
time_t mtime; /* gunzip code may set this on exit */
} transformer_state_t;
void init_transformer_state(transformer_state_t *xstate) FAST_FUNC;
ssize_t transformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
ssize_t xtransformer_write(transformer_state_t *xstate, const void *buf, size_t bufsize) FAST_FUNC;
int check_signature16(transformer_state_t *xstate, unsigned magic16) FAST_FUNC;
IF_DESKTOP(long long) int inflate_unzip(transformer_state_t *xstate) FAST_FUNC;
IF_DESKTOP(long long) int unpack_Z_stream(transformer_state_t *xstate) FAST_FUNC;
IF_DESKTOP(long long) int unpack_gz_stream(transformer_state_t *xstate) FAST_FUNC;
IF_DESKTOP(long long) int unpack_bz2_stream(transformer_state_t *xstate) FAST_FUNC;
IF_DESKTOP(long long) int unpack_lzma_stream(transformer_state_t *xstate) FAST_FUNC;
IF_DESKTOP(long long) int unpack_xz_stream(transformer_state_t *xstate) FAST_FUNC;
char* append_ext(char *filename, const char *expected_ext) FAST_FUNC;
int bbunpack(char **argv,
IF_DESKTOP(long long) int FAST_FUNC (*unpacker)(transformer_state_t *xstate),
char* FAST_FUNC (*make_new_name)(char *filename, const char *expected_ext),
const char *expected_ext
) FAST_FUNC;
void check_errors_in_children(int signo);
#if BB_MMU
void fork_transformer(int fd,
int signature_skipped,
IF_DESKTOP(long long) int FAST_FUNC (*transformer)(transformer_state_t *xstate)
) FAST_FUNC;
#define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), 0, (transformer))
#define fork_transformer_with_no_sig(fd, transformer) fork_transformer((fd), 1, (transformer))
#else
void fork_transformer(int fd, const char *transform_prog) FAST_FUNC;
#define fork_transformer_with_sig(fd, transformer, transform_prog) fork_transformer((fd), (transform_prog))
/* fork_transformer_with_no_sig() does not exist on NOMMU */
#endif
POP_SAVED_FUNCTION_VISIBILITY
#endif
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