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Ticket #1952: tar: support long file names in archive.

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Initial changeset: tar.c: update code to be close to GNU tar.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
This commit is contained in:
Andrew Borodin 2020-06-28 15:59:52 +03:00
parent 86a9e0be2c
commit 78a25f7800
2 changed files with 355 additions and 38 deletions
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2
configure.ac
View File

@ -255,6 +255,8 @@ AC_TYPE_MODE_T
gl_PROMOTED_TYPE_MODE_T gl_PROMOTED_TYPE_MODE_T
AC_TYPE_PID_T AC_TYPE_PID_T
AC_TYPE_UID_T AC_TYPE_UID_T
AC_CHECK_TYPE([major_t], [], [AC_DEFINE([major_t], [int], [Type of major device numbers.])])
AC_CHECK_TYPE([minor_t], [], [AC_DEFINE([minor_t], [int], [Type of minor device numbers.])])
AC_STRUCT_ST_BLOCKS AC_STRUCT_ST_BLOCKS
AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_rdev, struct stat.st_mtim]) AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_rdev, struct stat.st_mtim])

383
src/vfs/tar/tar.c
View File

@ -37,10 +37,14 @@
#include <config.h> #include <config.h>
#include <ctype.h> #include <ctype.h> /* isspace() */
#include <errno.h> #include <errno.h>
#include <inttypes.h> /* uintmax_t */
#include <limits.h> /* CHAR_BIT, INT_MAX, etc */
#include <stdint.h> /* UINTMAX_MAX, etc */
#include <sys/types.h> #include <sys/types.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <string.h> /* memset() */
#ifdef hpux #ifdef hpux
/* major() and minor() macros (among other things) defined here for hpux */ /* major() and minor() macros (among other things) defined here for hpux */
@ -135,6 +139,41 @@
#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') ) #define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
/* Log base 2 of common values. */
#define LG_8 3
#define LG_64 6
#define LG_256 8
/* Bits used in the mode field, values in octal. */
#define TSUID 04000 /* set UID on execution */
#define TSGID 02000 /* set GID on execution */
#define TSVTX 01000 /* reserved */
/* file permissions */
#define TUREAD 00400 /* read by owner */
#define TUWRITE 00200 /* write by owner */
#define TUEXEC 00100 /* execute/search by owner */
#define TGREAD 00040 /* read by group */
#define TGWRITE 00020 /* write by group */
#define TGEXEC 00010 /* execute/search by group */
#define TOREAD 00004 /* read by other */
#define TOWRITE 00002 /* write by other */
#define TOEXEC 00001 /* execute/search by other */
/* These macros work even on ones'-complement hosts (!).
The extra casts work around some compiler bugs. */
#define TYPE_SIGNED(t) (!((t) 0 < (t) (-1)))
#define TYPE_MINIMUM(t) (TYPE_SIGNED (t) ? ~(t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0)
#define TYPE_MAXIMUM(t) (~(t) 0 - TYPE_MINIMUM (t))
#define GID_FROM_HEADER(where) gid_from_header (where, sizeof (where))
#define MAJOR_FROM_HEADER(where) major_from_header (where, sizeof (where))
#define MINOR_FROM_HEADER(where) minor_from_header (where, sizeof (where))
#define MODE_FROM_HEADER(where,hbits) mode_from_header (where, sizeof (where), hbits)
#define OFF_FROM_HEADER(where) off_from_header (where, sizeof (where))
#define TIME_FROM_HEADER(where) time_from_header (where, sizeof (where))
#define UID_FROM_HEADER(where) uid_from_header (where, sizeof (where))
#define UINTMAX_FROM_HEADER(where) uintmax_from_header (where, sizeof (where))
/*** file scope type declarations ****************************************************************/ /*** file scope type declarations ****************************************************************/
/* *INDENT-OFF* */ /* *INDENT-OFF* */
@ -247,6 +286,19 @@ typedef struct
/*** file scope variables ************************************************************************/ /*** file scope variables ************************************************************************/
/* Base 64 digits; see RFC 2045 Table 1. */
static char const base_64_digits[64] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
/* Table of base 64 digit values indexed by unsigned chars.
The value is 64 for unsigned chars that are not base 64 digits. */
static char base64_map[1 + (unsigned char) (-1)];
static struct vfs_s_subclass tarfs_subclass; static struct vfs_s_subclass tarfs_subclass;
static struct vfs_class *vfs_tarfs_ops = VFS_CLASS (&tarfs_subclass); static struct vfs_class *vfs_tarfs_ops = VFS_CLASS (&tarfs_subclass);
@ -258,33 +310,292 @@ static union block block_buf;
/* --------------------------------------------------------------------------------------------- */ /* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/ /*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */ /* --------------------------------------------------------------------------------------------- */
/**
* Quick and dirty octal conversion. static void
* tar_base64_init (void)
* Result is -1 if the field is invalid (all blank, or nonoctal).
*/
static long
tar_from_oct (int digs, const char *where)
{ {
long value; size_t i;
memset (base64_map, 64, sizeof base64_map);
for (i = 0; i < 64; i++)
base64_map[(int) base_64_digits[i]] = i;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Represent @n using a signed integer I such that (uintmax_t) I == @n.
With a good optimizing compiler, this is equivalent to (intmax_t) i
and requires zero machine instructions. */
#if !(UINTMAX_MAX / 2 <= INTMAX_MAX)
#error "tar_represent_uintmax() returns intmax_t to represent uintmax_t"
#endif
static inline intmax_t
tar_represent_uintmax (uintmax_t n)
{
if (n <= INTMAX_MAX)
return n;
{
/* Avoid signed integer overflow on picky platforms. */
intmax_t nd = n - INTMAX_MIN;
return nd + INTMAX_MIN;
}
}
/* --------------------------------------------------------------------------------------------- */
/**
* Convert buffer at @where0 of size @digs from external format to intmax_t.
* @digs must be positive.
* If @type is non-NULL, data are of type @type.
* The buffer must represent a value in the range -@minval through @maxval;
* if the mathematically correct result V would be greater than INTMAX_MAX,
* return a negative integer V such that (uintmax_t) V yields the correct result.
* If @octal_only, allow only octal numbers instead of the other GNU extensions.
*
* Result is -1 if the field is invalid.
*/
#if !(INTMAX_MAX <= UINTMAX_MAX && - (INTMAX_MIN + 1) <= UINTMAX_MAX)
#error "tar_from_header() internally represents intmax_t as uintmax_t + sign"
#endif
#if !(UINTMAX_MAX / 2 <= INTMAX_MAX)
#error "tar_from_header() returns intmax_t to represent uintmax_t"
#endif
static intmax_t
tar_from_header (const char *where0, size_t digs, char const *type, intmax_t minval,
uintmax_t maxval, gboolean octal_only)
{
uintmax_t value = 0;
uintmax_t uminval = minval;
uintmax_t minus_minval = -uminval;
const char *where = where0;
char const *lim = where + digs;
gboolean negative = FALSE;
/* Accommodate buggy tar of unknown vintage, which outputs leading
NUL if the previous field overflows. */
if (*where == '\0')
where++;
/* Accommodate older tars, which output leading spaces. */
while (TRUE)
{
if (where == lim)
return (-1);
if (!isspace ((unsigned char) *where))
break;
while (isspace ((unsigned char) *where))
{ /* Skip spaces */
where++; where++;
if (--digs <= 0)
return -1; /* All blank field */
} }
if (isodigit (*where))
{
char const *where1 = where;
gboolean overflow = FALSE;
while (TRUE)
{
value += *where++ - '0';
if (where == lim || !isodigit (*where))
break;
overflow |= value != (value << LG_8 >> LG_8);
value <<= LG_8;
}
/* Parse the output of older, unportable tars, which generate
negative values in two's complement octal. If the leading
nonzero digit is 1, we can't recover the original value
reliably; so do this only if the digit is 2 or more. This
catches the common case of 32-bit negative time stamps. */
if ((overflow || maxval < value) && *where1 >= 2 && type != NULL)
{
/* Compute the negative of the input value, assuming two's complement. */
int digit;
digit = (*where1 - '0') | 4;
overflow = FALSE;
value = 0; value = 0;
while (digs > 0 && isodigit (*where)) where = where1;
{ /* Scan till nonoctal */
value = (value << 3) | (*where++ - '0'); while (TRUE)
--digs; {
value += 7 - digit;
where++;
if (where == lim || !isodigit (*where))
break;
digit = *where - '0';
overflow |= value != (value << LG_8 >> LG_8);
value <<= LG_8;
} }
if (digs > 0 && *where && !isspace ((unsigned char) *where)) value++;
return -1; /* Ended on non-space/nul */ overflow |= value == 0;
return value; if (!overflow && value <= minus_minval)
negative = TRUE;
}
if (overflow)
return (-1);
}
else if (octal_only)
{
/* Suppress the following extensions. */
}
else if (*where == '-' || *where == '+')
{
/* Parse base-64 output produced only by tar test versions
1.13.6 (1999-08-11) through 1.13.11 (1999-08-23).
Support for this will be withdrawn in future tar releases. */
int dig;
negative = *where++ == '-';
while (where != lim && (dig = base64_map[(unsigned char) *where]) < 64)
{
if (value << LG_64 >> LG_64 != value)
return (-1);
value = (value << LG_64) | dig;
where++;
}
}
else if (where <= lim - 2 && (*where == '\200' /* positive base-256 */
|| *where == '\377' /* negative base-256 */ ))
{
/* Parse base-256 output. A nonnegative number N is
represented as (256**DIGS)/2 + N; a negative number -N is
represented as (256**DIGS) - N, i.e. as two's complement.
The representation guarantees that the leading bit is
always on, so that we don't confuse this format with the
others (assuming ASCII bytes of 8 bits or more). */
int signbit;
uintmax_t topbits;
signbit = *where & (1 << (LG_256 - 2));
topbits =
(((uintmax_t) - signbit) << (CHAR_BIT * sizeof (uintmax_t) - LG_256 - (LG_256 - 2)));
value = (*where++ & ((1 << (LG_256 - 2)) - 1)) - signbit;
while (TRUE)
{
value = (value << LG_256) + (unsigned char) *where++;
if (where == lim)
break;
if (((value << LG_256 >> LG_256) | topbits) != value)
return (-1);
}
negative = signbit != 0;
if (negative)
value = -value;
}
if (where != lim && *where != '\0' && !isspace ((unsigned char) *where))
return (-1);
if (value <= (negative ? minus_minval : maxval))
return tar_represent_uintmax (negative ? -value : value);
return (-1);
}
/* --------------------------------------------------------------------------------------------- */
static inline gid_t
gid_from_header (const char *p, size_t s)
{
return tar_from_header (p, s, "gid_t", TYPE_MINIMUM (gid_t), TYPE_MAXIMUM (gid_t), FALSE);
}
/* --------------------------------------------------------------------------------------------- */
static inline major_t
major_from_header (const char *p, size_t s)
{
return tar_from_header (p, s, "major_t", TYPE_MINIMUM (major_t), TYPE_MAXIMUM (major_t), FALSE);
}
/* --------------------------------------------------------------------------------------------- */
static inline minor_t
minor_from_header (const char *p, size_t s)
{
return tar_from_header (p, s, "minor_t", TYPE_MINIMUM (minor_t), TYPE_MAXIMUM (minor_t), FALSE);
}
/* --------------------------------------------------------------------------------------------- */
/**
* Convert @p to the file mode, as understood by tar.
* Store unrecognized mode bits (from 10th up) in @hbits.
* Set *hbits if there are any unrecognized bits.
* */
static inline mode_t
mode_from_header (const char *p, size_t s, gboolean * hbits)
{
unsigned int u;
mode_t mode;
/* Do not complain about unrecognized mode bits. */
u = tar_from_header (p, s, "mode_t", INTMAX_MIN, UINTMAX_MAX, FALSE);
/* *INDENT-OFF* */
mode = ((u & TSUID ? S_ISUID : 0)
| (u & TSGID ? S_ISGID : 0)
| (u & TSVTX ? S_ISVTX : 0)
| (u & TUREAD ? S_IRUSR : 0)
| (u & TUWRITE ? S_IWUSR : 0)
| (u & TUEXEC ? S_IXUSR : 0)
| (u & TGREAD ? S_IRGRP : 0)
| (u & TGWRITE ? S_IWGRP : 0)
| (u & TGEXEC ? S_IXGRP : 0)
| (u & TOREAD ? S_IROTH : 0)
| (u & TOWRITE ? S_IWOTH : 0)
| (u & TOEXEC ? S_IXOTH : 0));
/* *INDENT-ON* */
if (hbits != NULL)
*hbits = (u & ~07777) != 0;
return mode;
}
/* --------------------------------------------------------------------------------------------- */
static inline off_t
off_from_header (const char *p, size_t s)
{
/* Negative offsets are not allowed in tar files, so invoke
from_header with minimum value 0, not TYPE_MINIMUM (off_t). */
return tar_from_header (p, s, "off_t", 0, TYPE_MAXIMUM (off_t), FALSE);
}
/* --------------------------------------------------------------------------------------------- */
static inline time_t
time_from_header (const char *p, size_t s)
{
return tar_from_header (p, s, "time_t", TYPE_MINIMUM (time_t), TYPE_MAXIMUM (time_t), FALSE);
}
/* --------------------------------------------------------------------------------------------- */
static inline uid_t
uid_from_header (const char *p, size_t s)
{
return tar_from_header (p, s, "uid_t", TYPE_MINIMUM (uid_t), TYPE_MAXIMUM (uid_t), FALSE);
}
/* --------------------------------------------------------------------------------------------- */
static inline uintmax_t
uintmax_from_header (const char *p, size_t s)
{
return tar_from_header (p, s, "uintmax_t", 0, UINTMAX_MAX, FALSE);
} }
/* --------------------------------------------------------------------------------------------- */ /* --------------------------------------------------------------------------------------------- */
@ -325,7 +636,7 @@ tar_checksum (const union block *header)
int unsigned_sum = 0; /* the POSIX one :-) */ int unsigned_sum = 0; /* the POSIX one :-) */
int signed_sum = 0; /* the Sun one :-( */ int signed_sum = 0; /* the Sun one :-( */
int recorded_sum; int recorded_sum;
long parsed_sum; int parsed_sum;
const char *p = header->buffer; const char *p = header->buffer;
for (i = sizeof (*header); i-- != 0;) for (i = sizeof (*header); i-- != 0;)
@ -347,8 +658,10 @@ tar_checksum (const union block *header)
unsigned_sum += ' ' * sizeof (header->header.chksum); unsigned_sum += ' ' * sizeof (header->header.chksum);
signed_sum += ' ' * sizeof (header->header.chksum); signed_sum += ' ' * sizeof (header->header.chksum);
parsed_sum = tar_from_oct (8, header->header.chksum); parsed_sum =
if (parsed_sum == -1) tar_from_header (header->header.chksum, sizeof (header->header.chksum), NULL, 0,
INT_MAX, TRUE);
if (parsed_sum < 0)
return HEADER_FAILURE; return HEADER_FAILURE;
recorded_sum = parsed_sum; recorded_sum = parsed_sum;
@ -404,7 +717,7 @@ tar_decode_header (union block *header, tar_super_t * arch)
if (header->header.typeflag == LNKTYPE || header->header.typeflag == DIRTYPE) if (header->header.typeflag == LNKTYPE || header->header.typeflag == DIRTYPE)
size = 0; /* Links 0 size on tape */ size = 0; /* Links 0 size on tape */
else else
size = tar_from_oct (1 + 12, header->header.size); size = OFF_FROM_HEADER (header->header.size);
if (header->header.typeflag == GNUTYPE_DUMPDIR) if (header->header.typeflag == GNUTYPE_DUMPDIR)
if (arch->type == TAR_UNKNOWN) if (arch->type == TAR_UNKNOWN)
@ -420,7 +733,7 @@ tar_fill_stat (struct vfs_s_super *archive, struct stat *st, union block *header
{ {
tar_super_t *arch = TAR_SUPER (archive); tar_super_t *arch = TAR_SUPER (archive);
st->st_mode = tar_from_oct (8, header->header.mode); st->st_mode = MODE_FROM_HEADER (header->header.mode, NULL);
/* Adjust st->st_mode because there are tar-files with /* Adjust st->st_mode because there are tar-files with
* typeflag==SYMTYPE and S_ISLNK(mod)==0. I don't * typeflag==SYMTYPE and S_ISLNK(mod)==0. I don't
@ -453,10 +766,10 @@ tar_fill_stat (struct vfs_s_super *archive, struct stat *st, union block *header
/* *INDENT-OFF* */ /* *INDENT-OFF* */
st->st_uid = *header->header.uname != '\0' st->st_uid = *header->header.uname != '\0'
? (uid_t) vfs_finduid (header->header.uname) ? (uid_t) vfs_finduid (header->header.uname)
: tar_from_oct (8, header->header.uid); : UID_FROM_HEADER (header->header.uid);
st->st_gid = *header->header.gname != '\0' st->st_gid = *header->header.gname != '\0'
? (gid_t) vfs_findgid (header->header.gname) ? (gid_t) vfs_findgid (header->header.gname)
: tar_from_oct (8,header->header.gid); : GID_FROM_HEADER (header->header.gid);
/* *INDENT-ON* */ /* *INDENT-ON* */
switch (header->header.typeflag) switch (header->header.typeflag)
@ -465,8 +778,8 @@ tar_fill_stat (struct vfs_s_super *archive, struct stat *st, union block *header
case CHRTYPE: case CHRTYPE:
#ifdef HAVE_STRUCT_STAT_ST_RDEV #ifdef HAVE_STRUCT_STAT_ST_RDEV
st->st_rdev = st->st_rdev =
makedev (tar_from_oct (8, header->header.devmajor), makedev (MAJOR_FROM_HEADER (header->header.devmajor),
tar_from_oct (8, header->header.devminor)); MINOR_FROM_HEADER (header->header.devminor));
#endif #endif
break; break;
default: default:
@ -475,8 +788,8 @@ tar_fill_stat (struct vfs_s_super *archive, struct stat *st, union block *header
break; break;
default: default:
st->st_uid = tar_from_oct (8, header->header.uid); st->st_uid = UID_FROM_HEADER (header->header.uid);
st->st_gid = tar_from_oct (8, header->header.gid); st->st_gid = GID_FROM_HEADER (header->header.gid);
break; break;
} }
@ -484,13 +797,13 @@ tar_fill_stat (struct vfs_s_super *archive, struct stat *st, union block *header
#ifdef HAVE_STRUCT_STAT_ST_MTIM #ifdef HAVE_STRUCT_STAT_ST_MTIM
st->st_atim.tv_nsec = st->st_mtim.tv_nsec = st->st_ctim.tv_nsec = 0; st->st_atim.tv_nsec = st->st_mtim.tv_nsec = st->st_ctim.tv_nsec = 0;
#endif #endif
st->st_mtime = tar_from_oct (1 + 12, header->header.mtime); st->st_mtime = TIME_FROM_HEADER (header->header.mtime);
st->st_atime = 0; st->st_atime = 0;
st->st_ctime = 0; st->st_ctime = 0;
if (arch->type == TAR_GNU) if (arch->type == TAR_GNU)
{ {
st->st_atime = tar_from_oct (1 + 12, header->oldgnu_header.atime); st->st_atime = TIME_FROM_HEADER (header->oldgnu_header.atime);
st->st_ctime = tar_from_oct (1 + 12, header->oldgnu_header.ctime); st->st_ctime = TIME_FROM_HEADER (header->oldgnu_header.ctime);
} }
#ifdef HAVE_STRUCT_STAT_ST_BLKSIZE #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
@ -991,6 +1304,8 @@ vfs_init_tarfs (void)
tarfs_subclass.free_archive = tar_free_archive; tarfs_subclass.free_archive = tar_free_archive;
tarfs_subclass.fh_open = tar_fh_open; tarfs_subclass.fh_open = tar_fh_open;
vfs_register_class (vfs_tarfs_ops); vfs_register_class (vfs_tarfs_ops);
tar_base64_init ();
} }
/* --------------------------------------------------------------------------------------------- */ /* --------------------------------------------------------------------------------------------- */