[2725] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
| 3 | *
|
---|
| 4 | * FIXME:
|
---|
| 5 | * In privileged mode if uname and gname map to a uid and gid then use the
|
---|
| 6 | * mapped value instead of the uid/gid values in tar header
|
---|
| 7 | *
|
---|
| 8 | * References:
|
---|
| 9 | * GNU tar and star man pages,
|
---|
| 10 | * Opengroup's ustar interchange format,
|
---|
| 11 | * http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
|
---|
| 12 | */
|
---|
| 13 |
|
---|
| 14 | #include "libbb.h"
|
---|
[3232] | 15 | #include "bb_archive.h"
|
---|
[2725] | 16 |
|
---|
| 17 | typedef uint32_t aliased_uint32_t FIX_ALIASING;
|
---|
| 18 | typedef off_t aliased_off_t FIX_ALIASING;
|
---|
| 19 |
|
---|
| 20 | /* NB: _DESTROYS_ str[len] character! */
|
---|
| 21 | static unsigned long long getOctal(char *str, int len)
|
---|
| 22 | {
|
---|
| 23 | unsigned long long v;
|
---|
| 24 | char *end;
|
---|
| 25 | /* NB: leading spaces are allowed. Using strtoull to handle that.
|
---|
| 26 | * The downside is that we accept e.g. "-123" too :(
|
---|
| 27 | */
|
---|
| 28 | str[len] = '\0';
|
---|
| 29 | v = strtoull(str, &end, 8);
|
---|
| 30 | /* std: "Each numeric field is terminated by one or more
|
---|
| 31 | * <space> or NUL characters". We must support ' '! */
|
---|
| 32 | if (*end != '\0' && *end != ' ') {
|
---|
| 33 | int8_t first = str[0];
|
---|
| 34 | if (!(first & 0x80))
|
---|
| 35 | bb_error_msg_and_die("corrupted octal value in tar header");
|
---|
| 36 | /*
|
---|
| 37 | * GNU tar uses "base-256 encoding" for very large numbers.
|
---|
| 38 | * Encoding is binary, with highest bit always set as a marker
|
---|
| 39 | * and sign in next-highest bit:
|
---|
| 40 | * 80 00 .. 00 - zero
|
---|
| 41 | * bf ff .. ff - largest positive number
|
---|
| 42 | * ff ff .. ff - minus 1
|
---|
| 43 | * c0 00 .. 00 - smallest negative number
|
---|
| 44 | *
|
---|
| 45 | * Example of tar file with 8914993153 (0x213600001) byte file.
|
---|
| 46 | * Field starts at offset 7c:
|
---|
| 47 | * 00070 30 30 30 00 30 30 30 30 30 30 30 00 80 00 00 00 |000.0000000.....|
|
---|
| 48 | * 00080 00 00 00 02 13 60 00 01 31 31 31 32 30 33 33 36 |.....`..11120336|
|
---|
| 49 | *
|
---|
| 50 | * NB: tarballs with NEGATIVE unix times encoded that way were seen!
|
---|
| 51 | */
|
---|
[3232] | 52 | /* Sign-extend 7bit 'first' to 64bit 'v' (that is, using 6th bit as sign): */
|
---|
| 53 | first <<= 1;
|
---|
| 54 | first >>= 1; /* now 7th bit = 6th bit */
|
---|
| 55 | v = first; /* sign-extend 8 bits to 64 */
|
---|
[2725] | 56 | while (--len != 0)
|
---|
[3232] | 57 | v = (v << 8) + (uint8_t) *++str;
|
---|
[2725] | 58 | }
|
---|
| 59 | return v;
|
---|
| 60 | }
|
---|
| 61 | #define GET_OCTAL(a) getOctal((a), sizeof(a))
|
---|
| 62 |
|
---|
[3621] | 63 | #define TAR_EXTD (ENABLE_FEATURE_TAR_GNU_EXTENSIONS || ENABLE_FEATURE_TAR_SELINUX)
|
---|
| 64 | #if !TAR_EXTD
|
---|
| 65 | #define process_pax_hdr(archive_handle, sz, global) \
|
---|
| 66 | process_pax_hdr(archive_handle, sz)
|
---|
| 67 | #endif
|
---|
[3232] | 68 | /* "global" is 0 or 1 */
|
---|
| 69 | static void process_pax_hdr(archive_handle_t *archive_handle, unsigned sz, int global)
|
---|
[2725] | 70 | {
|
---|
[3621] | 71 | #if !TAR_EXTD
|
---|
| 72 | unsigned blk_sz = (sz + 511) & (~511);
|
---|
| 73 | seek_by_read(archive_handle->src_fd, blk_sz);
|
---|
| 74 | #else
|
---|
| 75 | unsigned blk_sz = (sz + 511) & (~511);
|
---|
[2725] | 76 | char *buf, *p;
|
---|
| 77 |
|
---|
[3232] | 78 | p = buf = xmalloc(blk_sz + 1);
|
---|
| 79 | xread(archive_handle->src_fd, buf, blk_sz);
|
---|
| 80 | archive_handle->offset += blk_sz;
|
---|
| 81 |
|
---|
[2725] | 82 | /* prevent bb_strtou from running off the buffer */
|
---|
| 83 | buf[sz] = '\0';
|
---|
| 84 |
|
---|
| 85 | while (sz != 0) {
|
---|
| 86 | char *end, *value;
|
---|
| 87 | unsigned len;
|
---|
| 88 |
|
---|
| 89 | /* Every record has this format: "LEN NAME=VALUE\n" */
|
---|
| 90 | len = bb_strtou(p, &end, 10);
|
---|
| 91 | /* expect errno to be EINVAL, because the character
|
---|
| 92 | * following the digits should be a space
|
---|
| 93 | */
|
---|
| 94 | p += len;
|
---|
| 95 | sz -= len;
|
---|
[3621] | 96 | if (
|
---|
| 97 | /** (int)sz < 0 - not good enough for huge malicious VALUE of 2^32-1 */
|
---|
| 98 | (int)(sz|len) < 0 /* this works */
|
---|
[2725] | 99 | || len == 0
|
---|
| 100 | || errno != EINVAL
|
---|
| 101 | || *end != ' '
|
---|
| 102 | ) {
|
---|
| 103 | bb_error_msg("malformed extended header, skipped");
|
---|
| 104 | // More verbose version:
|
---|
| 105 | //bb_error_msg("malformed extended header at %"OFF_FMT"d, skipped",
|
---|
| 106 | // archive_handle->offset - (sz + len));
|
---|
| 107 | break;
|
---|
| 108 | }
|
---|
| 109 | /* overwrite the terminating newline with NUL
|
---|
| 110 | * (we do not bother to check that it *was* a newline)
|
---|
| 111 | */
|
---|
| 112 | p[-1] = '\0';
|
---|
| 113 | value = end + 1;
|
---|
[3232] | 114 |
|
---|
[3621] | 115 | # if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
| 116 | if (!global && is_prefixed_with(value, "path=")) {
|
---|
[3232] | 117 | value += sizeof("path=") - 1;
|
---|
| 118 | free(archive_handle->tar__longname);
|
---|
| 119 | archive_handle->tar__longname = xstrdup(value);
|
---|
| 120 | continue;
|
---|
| 121 | }
|
---|
[3621] | 122 | # endif
|
---|
[3232] | 123 |
|
---|
[3621] | 124 | # if ENABLE_FEATURE_TAR_SELINUX
|
---|
[3232] | 125 | /* Scan for SELinux contexts, via "RHT.security.selinux" keyword.
|
---|
| 126 | * This is what Red Hat's patched version of tar uses.
|
---|
| 127 | */
|
---|
[3621] | 128 | # define SELINUX_CONTEXT_KEYWORD "RHT.security.selinux"
|
---|
| 129 | if (is_prefixed_with(value, SELINUX_CONTEXT_KEYWORD"=")) {
|
---|
[2725] | 130 | value += sizeof(SELINUX_CONTEXT_KEYWORD"=") - 1;
|
---|
[3232] | 131 | free(archive_handle->tar__sctx[global]);
|
---|
| 132 | archive_handle->tar__sctx[global] = xstrdup(value);
|
---|
| 133 | continue;
|
---|
[2725] | 134 | }
|
---|
[3621] | 135 | # endif
|
---|
[2725] | 136 | }
|
---|
| 137 |
|
---|
| 138 | free(buf);
|
---|
[3621] | 139 | #endif
|
---|
[2725] | 140 | }
|
---|
| 141 |
|
---|
| 142 | char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
|
---|
| 143 | {
|
---|
| 144 | file_header_t *file_header = archive_handle->file_header;
|
---|
| 145 | struct tar_header_t tar;
|
---|
| 146 | char *cp;
|
---|
| 147 | int i, sum_u, sum;
|
---|
| 148 | #if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
|
---|
| 149 | int sum_s;
|
---|
| 150 | #endif
|
---|
| 151 | int parse_names;
|
---|
| 152 |
|
---|
| 153 | /* Our "private data" */
|
---|
| 154 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
| 155 | # define p_longname (archive_handle->tar__longname)
|
---|
| 156 | # define p_linkname (archive_handle->tar__linkname)
|
---|
| 157 | #else
|
---|
| 158 | # define p_longname 0
|
---|
| 159 | # define p_linkname 0
|
---|
| 160 | #endif
|
---|
| 161 |
|
---|
| 162 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS || ENABLE_FEATURE_TAR_SELINUX
|
---|
| 163 | again:
|
---|
| 164 | #endif
|
---|
| 165 | /* Align header */
|
---|
| 166 | data_align(archive_handle, 512);
|
---|
| 167 |
|
---|
| 168 | again_after_align:
|
---|
| 169 |
|
---|
| 170 | #if ENABLE_DESKTOP || ENABLE_FEATURE_TAR_AUTODETECT
|
---|
| 171 | /* to prevent misdetection of bz2 sig */
|
---|
| 172 | *(aliased_uint32_t*)&tar = 0;
|
---|
| 173 | i = full_read(archive_handle->src_fd, &tar, 512);
|
---|
| 174 | /* If GNU tar sees EOF in above read, it says:
|
---|
| 175 | * "tar: A lone zero block at N", where N = kilobyte
|
---|
| 176 | * where EOF was met (not EOF block, actual EOF!),
|
---|
| 177 | * and exits with EXIT_SUCCESS.
|
---|
| 178 | * We will mimic exit(EXIT_SUCCESS), although we will not mimic
|
---|
| 179 | * the message and we don't check whether we indeed
|
---|
| 180 | * saw zero block directly before this. */
|
---|
| 181 | if (i == 0) {
|
---|
[3621] | 182 | bb_error_msg("short read");
|
---|
| 183 | /* this merely signals end of archive, not exit(1): */
|
---|
| 184 | return EXIT_FAILURE;
|
---|
[2725] | 185 | }
|
---|
| 186 | if (i != 512) {
|
---|
| 187 | IF_FEATURE_TAR_AUTODETECT(goto autodetect;)
|
---|
[3621] | 188 | bb_error_msg_and_die("short read");
|
---|
[2725] | 189 | }
|
---|
| 190 |
|
---|
| 191 | #else
|
---|
| 192 | i = 512;
|
---|
| 193 | xread(archive_handle->src_fd, &tar, i);
|
---|
| 194 | #endif
|
---|
| 195 | archive_handle->offset += i;
|
---|
| 196 |
|
---|
| 197 | /* If there is no filename its an empty header */
|
---|
| 198 | if (tar.name[0] == 0 && tar.prefix[0] == 0) {
|
---|
| 199 | if (archive_handle->tar__end) {
|
---|
| 200 | /* Second consecutive empty header - end of archive.
|
---|
| 201 | * Read until the end to empty the pipe from gz or bz2
|
---|
| 202 | */
|
---|
| 203 | while (full_read(archive_handle->src_fd, &tar, 512) == 512)
|
---|
| 204 | continue;
|
---|
[3621] | 205 | return EXIT_FAILURE; /* "end of archive" */
|
---|
[2725] | 206 | }
|
---|
| 207 | archive_handle->tar__end = 1;
|
---|
[3621] | 208 | return EXIT_SUCCESS; /* "decoded one header" */
|
---|
[2725] | 209 | }
|
---|
| 210 | archive_handle->tar__end = 0;
|
---|
| 211 |
|
---|
| 212 | /* Check header has valid magic, "ustar" is for the proper tar,
|
---|
| 213 | * five NULs are for the old tar format */
|
---|
[3621] | 214 | if (!is_prefixed_with(tar.magic, "ustar")
|
---|
[2725] | 215 | && (!ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
|
---|
| 216 | || memcmp(tar.magic, "\0\0\0\0", 5) != 0)
|
---|
| 217 | ) {
|
---|
| 218 | #if ENABLE_FEATURE_TAR_AUTODETECT
|
---|
| 219 | autodetect:
|
---|
| 220 | /* Two different causes for lseek() != 0:
|
---|
| 221 | * unseekable fd (would like to support that too, but...),
|
---|
| 222 | * or not first block (false positive, it's not .gz/.bz2!) */
|
---|
| 223 | if (lseek(archive_handle->src_fd, -i, SEEK_CUR) != 0)
|
---|
| 224 | goto err;
|
---|
[3621] | 225 | if (setup_unzip_on_fd(archive_handle->src_fd, /*fail_if_not_compressed:*/ 0) != 0)
|
---|
[2725] | 226 | err:
|
---|
[3232] | 227 | bb_error_msg_and_die("invalid tar magic");
|
---|
| 228 | archive_handle->offset = 0;
|
---|
| 229 | goto again_after_align;
|
---|
| 230 | #endif
|
---|
[2725] | 231 | bb_error_msg_and_die("invalid tar magic");
|
---|
| 232 | }
|
---|
| 233 |
|
---|
| 234 | /* Do checksum on headers.
|
---|
| 235 | * POSIX says that checksum is done on unsigned bytes, but
|
---|
| 236 | * Sun and HP-UX gets it wrong... more details in
|
---|
| 237 | * GNU tar source. */
|
---|
| 238 | #if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
|
---|
| 239 | sum_s = ' ' * sizeof(tar.chksum);
|
---|
| 240 | #endif
|
---|
| 241 | sum_u = ' ' * sizeof(tar.chksum);
|
---|
| 242 | for (i = 0; i < 148; i++) {
|
---|
| 243 | sum_u += ((unsigned char*)&tar)[i];
|
---|
| 244 | #if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
|
---|
| 245 | sum_s += ((signed char*)&tar)[i];
|
---|
| 246 | #endif
|
---|
| 247 | }
|
---|
| 248 | for (i = 156; i < 512; i++) {
|
---|
| 249 | sum_u += ((unsigned char*)&tar)[i];
|
---|
| 250 | #if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
|
---|
| 251 | sum_s += ((signed char*)&tar)[i];
|
---|
| 252 | #endif
|
---|
| 253 | }
|
---|
| 254 | /* This field does not need special treatment (getOctal) */
|
---|
| 255 | {
|
---|
| 256 | char *endp; /* gcc likes temp var for &endp */
|
---|
| 257 | sum = strtoul(tar.chksum, &endp, 8);
|
---|
| 258 | if ((*endp != '\0' && *endp != ' ')
|
---|
| 259 | || (sum_u != sum IF_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum))
|
---|
| 260 | ) {
|
---|
| 261 | bb_error_msg_and_die("invalid tar header checksum");
|
---|
| 262 | }
|
---|
| 263 | }
|
---|
| 264 | /* don't use xstrtoul, tar.chksum may have leading spaces */
|
---|
| 265 | sum = strtoul(tar.chksum, NULL, 8);
|
---|
| 266 | if (sum_u != sum IF_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum)) {
|
---|
| 267 | bb_error_msg_and_die("invalid tar header checksum");
|
---|
| 268 | }
|
---|
| 269 |
|
---|
| 270 | /* 0 is reserved for high perf file, treat as normal file */
|
---|
| 271 | if (!tar.typeflag) tar.typeflag = '0';
|
---|
| 272 | parse_names = (tar.typeflag >= '0' && tar.typeflag <= '7');
|
---|
| 273 |
|
---|
| 274 | /* getOctal trashes subsequent field, therefore we call it
|
---|
| 275 | * on fields in reverse order */
|
---|
| 276 | if (tar.devmajor[0]) {
|
---|
| 277 | char t = tar.prefix[0];
|
---|
| 278 | /* we trash prefix[0] here, but we DO need it later! */
|
---|
| 279 | unsigned minor = GET_OCTAL(tar.devminor);
|
---|
| 280 | unsigned major = GET_OCTAL(tar.devmajor);
|
---|
| 281 | file_header->device = makedev(major, minor);
|
---|
| 282 | tar.prefix[0] = t;
|
---|
| 283 | }
|
---|
| 284 | file_header->link_target = NULL;
|
---|
| 285 | if (!p_linkname && parse_names && tar.linkname[0]) {
|
---|
| 286 | file_header->link_target = xstrndup(tar.linkname, sizeof(tar.linkname));
|
---|
| 287 | /* FIXME: what if we have non-link object with link_target? */
|
---|
| 288 | /* Will link_target be free()ed? */
|
---|
| 289 | }
|
---|
| 290 | #if ENABLE_FEATURE_TAR_UNAME_GNAME
|
---|
| 291 | file_header->tar__uname = tar.uname[0] ? xstrndup(tar.uname, sizeof(tar.uname)) : NULL;
|
---|
| 292 | file_header->tar__gname = tar.gname[0] ? xstrndup(tar.gname, sizeof(tar.gname)) : NULL;
|
---|
| 293 | #endif
|
---|
| 294 | file_header->mtime = GET_OCTAL(tar.mtime);
|
---|
| 295 | file_header->size = GET_OCTAL(tar.size);
|
---|
| 296 | file_header->gid = GET_OCTAL(tar.gid);
|
---|
| 297 | file_header->uid = GET_OCTAL(tar.uid);
|
---|
| 298 | /* Set bits 0-11 of the files mode */
|
---|
| 299 | file_header->mode = 07777 & GET_OCTAL(tar.mode);
|
---|
| 300 |
|
---|
| 301 | file_header->name = NULL;
|
---|
| 302 | if (!p_longname && parse_names) {
|
---|
| 303 | /* we trash mode[0] here, it's ok */
|
---|
| 304 | //tar.name[sizeof(tar.name)] = '\0'; - gcc 4.3.0 would complain
|
---|
| 305 | tar.mode[0] = '\0';
|
---|
| 306 | if (tar.prefix[0]) {
|
---|
| 307 | /* and padding[0] */
|
---|
| 308 | //tar.prefix[sizeof(tar.prefix)] = '\0'; - gcc 4.3.0 would complain
|
---|
| 309 | tar.padding[0] = '\0';
|
---|
| 310 | file_header->name = concat_path_file(tar.prefix, tar.name);
|
---|
| 311 | } else
|
---|
| 312 | file_header->name = xstrdup(tar.name);
|
---|
| 313 | }
|
---|
| 314 |
|
---|
| 315 | /* Set bits 12-15 of the files mode */
|
---|
| 316 | /* (typeflag was not trashed because chksum does not use getOctal) */
|
---|
| 317 | switch (tar.typeflag) {
|
---|
[3232] | 318 | case '1': /* hardlink */
|
---|
| 319 | /* we mark hardlinks as regular files with zero size and a link name */
|
---|
[2725] | 320 | file_header->mode |= S_IFREG;
|
---|
[3232] | 321 | /* on size of link fields from star(4)
|
---|
| 322 | * ... For tar archives written by pre POSIX.1-1988
|
---|
| 323 | * implementations, the size field usually contains the size of
|
---|
| 324 | * the file and needs to be ignored as no data may follow this
|
---|
| 325 | * header type. For POSIX.1- 1988 compliant archives, the size
|
---|
| 326 | * field needs to be 0. For POSIX.1-2001 compliant archives,
|
---|
| 327 | * the size field may be non zero, indicating that file data is
|
---|
| 328 | * included in the archive.
|
---|
| 329 | * i.e; always assume this is zero for safety.
|
---|
| 330 | */
|
---|
| 331 | goto size0;
|
---|
[2725] | 332 | case '7':
|
---|
| 333 | /* case 0: */
|
---|
| 334 | case '0':
|
---|
| 335 | #if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
|
---|
| 336 | if (last_char_is(file_header->name, '/')) {
|
---|
| 337 | goto set_dir;
|
---|
| 338 | }
|
---|
| 339 | #endif
|
---|
| 340 | file_header->mode |= S_IFREG;
|
---|
| 341 | break;
|
---|
| 342 | case '2':
|
---|
| 343 | file_header->mode |= S_IFLNK;
|
---|
| 344 | /* have seen tarballs with size field containing
|
---|
| 345 | * the size of the link target's name */
|
---|
| 346 | size0:
|
---|
| 347 | file_header->size = 0;
|
---|
| 348 | break;
|
---|
| 349 | case '3':
|
---|
| 350 | file_header->mode |= S_IFCHR;
|
---|
| 351 | goto size0; /* paranoia */
|
---|
| 352 | case '4':
|
---|
| 353 | file_header->mode |= S_IFBLK;
|
---|
| 354 | goto size0;
|
---|
| 355 | case '5':
|
---|
| 356 | IF_FEATURE_TAR_OLDGNU_COMPATIBILITY(set_dir:)
|
---|
| 357 | file_header->mode |= S_IFDIR;
|
---|
| 358 | goto size0;
|
---|
| 359 | case '6':
|
---|
| 360 | file_header->mode |= S_IFIFO;
|
---|
| 361 | goto size0;
|
---|
[3621] | 362 | case 'g': /* pax global header */
|
---|
| 363 | case 'x': { /* pax extended header */
|
---|
| 364 | if ((uoff_t)file_header->size > 0xfffff) /* paranoia */
|
---|
| 365 | goto skip_ext_hdr;
|
---|
| 366 | process_pax_hdr(archive_handle, file_header->size, (tar.typeflag == 'g'));
|
---|
| 367 | goto again_after_align;
|
---|
[2725] | 368 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
[3621] | 369 | /* See http://www.gnu.org/software/tar/manual/html_node/Extensions.html */
|
---|
[2725] | 370 | case 'L':
|
---|
| 371 | /* free: paranoia: tar with several consecutive longnames */
|
---|
| 372 | free(p_longname);
|
---|
| 373 | /* For paranoia reasons we allocate extra NUL char */
|
---|
| 374 | p_longname = xzalloc(file_header->size + 1);
|
---|
| 375 | /* We read ASCIZ string, including NUL */
|
---|
| 376 | xread(archive_handle->src_fd, p_longname, file_header->size);
|
---|
| 377 | archive_handle->offset += file_header->size;
|
---|
| 378 | /* return get_header_tar(archive_handle); */
|
---|
| 379 | /* gcc 4.1.1 didn't optimize it into jump */
|
---|
| 380 | /* so we will do it ourself, this also saves stack */
|
---|
| 381 | goto again;
|
---|
| 382 | case 'K':
|
---|
| 383 | free(p_linkname);
|
---|
| 384 | p_linkname = xzalloc(file_header->size + 1);
|
---|
| 385 | xread(archive_handle->src_fd, p_linkname, file_header->size);
|
---|
| 386 | archive_handle->offset += file_header->size;
|
---|
| 387 | /* return get_header_tar(archive_handle); */
|
---|
| 388 | goto again;
|
---|
[3621] | 389 | /*
|
---|
| 390 | * case 'S': // Sparse file
|
---|
| 391 | * Was seen in the wild. Not supported (yet?).
|
---|
| 392 | * See https://www.gnu.org/software/tar/manual/html_section/tar_92.html
|
---|
| 393 | * for the format. (An "Old GNU Format" was seen, not PAX formats).
|
---|
| 394 | */
|
---|
| 395 | // case 'D': /* GNU dump dir */
|
---|
| 396 | // case 'M': /* Continuation of multi volume archive */
|
---|
| 397 | // case 'N': /* Old GNU for names > 100 characters */
|
---|
| 398 | // case 'V': /* Volume header */
|
---|
[2725] | 399 | #endif
|
---|
[3232] | 400 | }
|
---|
[2725] | 401 | skip_ext_hdr:
|
---|
| 402 | {
|
---|
| 403 | off_t sz;
|
---|
| 404 | bb_error_msg("warning: skipping header '%c'", tar.typeflag);
|
---|
| 405 | sz = (file_header->size + 511) & ~(off_t)511;
|
---|
| 406 | archive_handle->offset += sz;
|
---|
| 407 | sz >>= 9; /* sz /= 512 but w/o contortions for signed div */
|
---|
| 408 | while (sz--)
|
---|
| 409 | xread(archive_handle->src_fd, &tar, 512);
|
---|
| 410 | /* return get_header_tar(archive_handle); */
|
---|
| 411 | goto again_after_align;
|
---|
| 412 | }
|
---|
| 413 | default:
|
---|
| 414 | bb_error_msg_and_die("unknown typeflag: 0x%x", tar.typeflag);
|
---|
| 415 | }
|
---|
| 416 |
|
---|
| 417 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
|
---|
| 418 | if (p_longname) {
|
---|
| 419 | file_header->name = p_longname;
|
---|
| 420 | p_longname = NULL;
|
---|
| 421 | }
|
---|
| 422 | if (p_linkname) {
|
---|
| 423 | file_header->link_target = p_linkname;
|
---|
| 424 | p_linkname = NULL;
|
---|
| 425 | }
|
---|
| 426 | #endif
|
---|
| 427 |
|
---|
[3232] | 428 | /* Everything up to and including last ".." component is stripped */
|
---|
| 429 | overlapping_strcpy(file_header->name, strip_unsafe_prefix(file_header->name));
|
---|
[3621] | 430 | //TODO: do the same for file_header->link_target?
|
---|
[3232] | 431 |
|
---|
[2725] | 432 | /* Strip trailing '/' in directories */
|
---|
| 433 | /* Must be done after mode is set as '/' is used to check if it's a directory */
|
---|
| 434 | cp = last_char_is(file_header->name, '/');
|
---|
| 435 |
|
---|
| 436 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
|
---|
| 437 | archive_handle->action_header(/*archive_handle->*/ file_header);
|
---|
| 438 | /* Note that we kill the '/' only after action_header() */
|
---|
| 439 | /* (like GNU tar 1.15.1: verbose mode outputs "dir/dir/") */
|
---|
| 440 | if (cp)
|
---|
| 441 | *cp = '\0';
|
---|
| 442 | archive_handle->action_data(archive_handle);
|
---|
[3232] | 443 | if (archive_handle->accept || archive_handle->reject
|
---|
| 444 | || (archive_handle->ah_flags & ARCHIVE_REMEMBER_NAMES)
|
---|
| 445 | ) {
|
---|
[2725] | 446 | llist_add_to(&archive_handle->passed, file_header->name);
|
---|
[3232] | 447 | } else /* Caller isn't interested in list of unpacked files */
|
---|
[2725] | 448 | free(file_header->name);
|
---|
| 449 | } else {
|
---|
| 450 | data_skip(archive_handle);
|
---|
| 451 | free(file_header->name);
|
---|
| 452 | }
|
---|
| 453 | archive_handle->offset += file_header->size;
|
---|
| 454 |
|
---|
| 455 | free(file_header->link_target);
|
---|
| 456 | /* Do not free(file_header->name)!
|
---|
| 457 | * It might be inserted in archive_handle->passed - see above */
|
---|
| 458 | #if ENABLE_FEATURE_TAR_UNAME_GNAME
|
---|
| 459 | free(file_header->tar__uname);
|
---|
| 460 | free(file_header->tar__gname);
|
---|
| 461 | #endif
|
---|
[3621] | 462 | return EXIT_SUCCESS; /* "decoded one header" */
|
---|
[2725] | 463 | }
|
---|