lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Mini tar implementation for busybox |
| 4 | * |
| 5 | * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg |
| 6 | * by Glenn McGrath |
| 7 | * |
| 8 | * Note, that as of BusyBox-0.43, tar has been completely rewritten from the |
| 9 | * ground up. It still has remnants of the old code lying about, but it is |
| 10 | * very different now (i.e., cleaner, less global variables, etc.) |
| 11 | * |
| 12 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| 13 | * |
| 14 | * Based in part in the tar implementation in sash |
| 15 | * Copyright (c) 1999 by David I. Bell |
| 16 | * Permission is granted to use, distribute, or modify this source, |
| 17 | * provided that this copyright notice remains intact. |
| 18 | * Permission to distribute sash derived code under GPL has been granted. |
| 19 | * |
| 20 | * Based in part on the tar implementation from busybox-0.28 |
| 21 | * Copyright (C) 1995 Bruce Perens |
| 22 | * |
| 23 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 24 | */ |
| 25 | |
| 26 | /* TODO: security with -C DESTDIR option can be enhanced. |
| 27 | * Consider tar file created via: |
| 28 | * $ tar cvf bug.tar anything.txt |
| 29 | * $ ln -s /tmp symlink |
| 30 | * $ tar --append -f bug.tar symlink |
| 31 | * $ rm symlink |
| 32 | * $ mkdir symlink |
| 33 | * $ tar --append -f bug.tar symlink/evil.py |
| 34 | * |
| 35 | * This will result in an archive which contains: |
| 36 | * $ tar --list -f bug.tar |
| 37 | * anything.txt |
| 38 | * symlink |
| 39 | * symlink/evil.py |
| 40 | * |
| 41 | * Untarring it puts evil.py in '/tmp' even if the -C DESTDIR is given. |
| 42 | * This doesn't feel right, and IIRC GNU tar doesn't do that. |
| 43 | */ |
| 44 | |
| 45 | #include <fnmatch.h> |
| 46 | #include "libbb.h" |
| 47 | #include "bb_archive.h" |
| 48 | /* FIXME: Stop using this non-standard feature */ |
| 49 | #ifndef FNM_LEADING_DIR |
| 50 | # define FNM_LEADING_DIR 0 |
| 51 | #endif |
| 52 | |
| 53 | |
| 54 | //#define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__) |
| 55 | #define DBG(...) ((void)0) |
| 56 | |
| 57 | |
| 58 | #define block_buf bb_common_bufsiz1 |
| 59 | |
| 60 | |
| 61 | #if !ENABLE_FEATURE_SEAMLESS_GZ && !ENABLE_FEATURE_SEAMLESS_BZ2 |
| 62 | /* Do not pass gzip flag to writeTarFile() */ |
| 63 | #define writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude, gzip) \ |
| 64 | writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude) |
| 65 | #endif |
| 66 | |
| 67 | |
| 68 | #if ENABLE_FEATURE_TAR_CREATE |
| 69 | |
| 70 | /* |
| 71 | ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are |
| 72 | ** the only functions that deal with the HardLinkInfo structure. |
| 73 | ** Even these functions use the xxxHardLinkInfo() functions. |
| 74 | */ |
| 75 | typedef struct HardLinkInfo { |
| 76 | struct HardLinkInfo *next; /* Next entry in list */ |
| 77 | dev_t dev; /* Device number */ |
| 78 | ino_t ino; /* Inode number */ |
| 79 | // short linkCount; /* (Hard) Link Count */ |
| 80 | char name[1]; /* Start of filename (must be last) */ |
| 81 | } HardLinkInfo; |
| 82 | |
| 83 | /* Some info to be carried along when creating a new tarball */ |
| 84 | typedef struct TarBallInfo { |
| 85 | int tarFd; /* Open-for-write file descriptor |
| 86 | * for the tarball */ |
| 87 | int verboseFlag; /* Whether to print extra stuff or not */ |
| 88 | const llist_t *excludeList; /* List of files to not include */ |
| 89 | HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */ |
| 90 | HardLinkInfo *hlInfo; /* Hard Link Info for the current file */ |
| 91 | //TODO: save only st_dev + st_ino |
| 92 | struct stat tarFileStatBuf; /* Stat info for the tarball, letting |
| 93 | * us know the inode and device that the |
| 94 | * tarball lives, so we can avoid trying |
| 95 | * to include the tarball into itself */ |
| 96 | } TarBallInfo; |
| 97 | |
| 98 | /* A nice enum with all the possible tar file content types */ |
| 99 | enum { |
| 100 | REGTYPE = '0', /* regular file */ |
| 101 | REGTYPE0 = '\0', /* regular file (ancient bug compat) */ |
| 102 | LNKTYPE = '1', /* hard link */ |
| 103 | SYMTYPE = '2', /* symbolic link */ |
| 104 | CHRTYPE = '3', /* character special */ |
| 105 | BLKTYPE = '4', /* block special */ |
| 106 | DIRTYPE = '5', /* directory */ |
| 107 | FIFOTYPE = '6', /* FIFO special */ |
| 108 | CONTTYPE = '7', /* reserved */ |
| 109 | GNULONGLINK = 'K', /* GNU long (>100 chars) link name */ |
| 110 | GNULONGNAME = 'L', /* GNU long (>100 chars) file name */ |
| 111 | }; |
| 112 | |
| 113 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ |
| 114 | static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr, |
| 115 | struct stat *statbuf, |
| 116 | const char *fileName) |
| 117 | { |
| 118 | /* Note: hlInfoHeadPtr can never be NULL! */ |
| 119 | HardLinkInfo *hlInfo; |
| 120 | |
| 121 | hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName)); |
| 122 | hlInfo->next = *hlInfoHeadPtr; |
| 123 | *hlInfoHeadPtr = hlInfo; |
| 124 | hlInfo->dev = statbuf->st_dev; |
| 125 | hlInfo->ino = statbuf->st_ino; |
| 126 | // hlInfo->linkCount = statbuf->st_nlink; |
| 127 | strcpy(hlInfo->name, fileName); |
| 128 | } |
| 129 | |
| 130 | static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr) |
| 131 | { |
| 132 | HardLinkInfo *hlInfo; |
| 133 | HardLinkInfo *hlInfoNext; |
| 134 | |
| 135 | if (hlInfoHeadPtr) { |
| 136 | hlInfo = *hlInfoHeadPtr; |
| 137 | while (hlInfo) { |
| 138 | hlInfoNext = hlInfo->next; |
| 139 | free(hlInfo); |
| 140 | hlInfo = hlInfoNext; |
| 141 | } |
| 142 | *hlInfoHeadPtr = NULL; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */ |
| 147 | static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf) |
| 148 | { |
| 149 | while (hlInfo) { |
| 150 | if (statbuf->st_ino == hlInfo->ino |
| 151 | && statbuf->st_dev == hlInfo->dev |
| 152 | ) { |
| 153 | DBG("found hardlink:'%s'", hlInfo->name); |
| 154 | break; |
| 155 | } |
| 156 | hlInfo = hlInfo->next; |
| 157 | } |
| 158 | return hlInfo; |
| 159 | } |
| 160 | |
| 161 | /* Put an octal string into the specified buffer. |
| 162 | * The number is zero padded and possibly null terminated. |
| 163 | * Stores low-order bits only if whole value does not fit. */ |
| 164 | static void putOctal(char *cp, int len, off_t value) |
| 165 | { |
| 166 | char tempBuffer[sizeof(off_t)*3 + 1]; |
| 167 | char *tempString = tempBuffer; |
| 168 | int width; |
| 169 | |
| 170 | width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value); |
| 171 | tempString += (width - len); |
| 172 | |
| 173 | /* If string has leading zeroes, we can drop one */ |
| 174 | /* and field will have trailing '\0' */ |
| 175 | /* (increases chances of compat with other tars) */ |
| 176 | if (tempString[0] == '0') |
| 177 | tempString++; |
| 178 | |
| 179 | /* Copy the string to the field */ |
| 180 | memcpy(cp, tempString, len); |
| 181 | } |
| 182 | #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b)) |
| 183 | |
| 184 | static void chksum_and_xwrite(int fd, struct tar_header_t* hp) |
| 185 | { |
| 186 | /* POSIX says that checksum is done on unsigned bytes |
| 187 | * (Sun and HP-UX gets it wrong... more details in |
| 188 | * GNU tar source) */ |
| 189 | const unsigned char *cp; |
| 190 | int chksum, size; |
| 191 | |
| 192 | strcpy(hp->magic, "ustar "); |
| 193 | |
| 194 | /* Calculate and store the checksum (i.e., the sum of all of the bytes of |
| 195 | * the header). The checksum field must be filled with blanks for the |
| 196 | * calculation. The checksum field is formatted differently from the |
| 197 | * other fields: it has 6 digits, a null, then a space -- rather than |
| 198 | * digits, followed by a null like the other fields... */ |
| 199 | memset(hp->chksum, ' ', sizeof(hp->chksum)); |
| 200 | cp = (const unsigned char *) hp; |
| 201 | chksum = 0; |
| 202 | size = sizeof(*hp); |
| 203 | do { chksum += *cp++; } while (--size); |
| 204 | putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum); |
| 205 | |
| 206 | /* Now write the header out to disk */ |
| 207 | xwrite(fd, hp, sizeof(*hp)); |
| 208 | } |
| 209 | |
| 210 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| 211 | static void writeLongname(int fd, int type, const char *name, int dir) |
| 212 | { |
| 213 | static const struct { |
| 214 | char mode[8]; /* 100-107 */ |
| 215 | char uid[8]; /* 108-115 */ |
| 216 | char gid[8]; /* 116-123 */ |
| 217 | char size[12]; /* 124-135 */ |
| 218 | char mtime[12]; /* 136-147 */ |
| 219 | } prefilled = { |
| 220 | "0000000", |
| 221 | "0000000", |
| 222 | "0000000", |
| 223 | "00000000000", |
| 224 | "00000000000", |
| 225 | }; |
| 226 | struct tar_header_t header; |
| 227 | int size; |
| 228 | |
| 229 | dir = !!dir; /* normalize: 0/1 */ |
| 230 | size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */ |
| 231 | /* + dir: account for possible '/' */ |
| 232 | |
| 233 | memset(&header, 0, sizeof(header)); |
| 234 | strcpy(header.name, "././@LongLink"); |
| 235 | memcpy(header.mode, prefilled.mode, sizeof(prefilled)); |
| 236 | PUT_OCTAL(header.size, size); |
| 237 | header.typeflag = type; |
| 238 | chksum_and_xwrite(fd, &header); |
| 239 | |
| 240 | /* Write filename[/] and pad the block. */ |
| 241 | /* dir=0: writes 'name<NUL>', pads */ |
| 242 | /* dir=1: writes 'name', writes '/<NUL>', pads */ |
| 243 | dir *= 2; |
| 244 | xwrite(fd, name, size - dir); |
| 245 | xwrite(fd, "/", dir); |
| 246 | size = (-size) & (TAR_BLOCK_SIZE-1); |
| 247 | memset(&header, 0, size); |
| 248 | xwrite(fd, &header, size); |
| 249 | } |
| 250 | #endif |
| 251 | |
| 252 | /* Write out a tar header for the specified file/directory/whatever */ |
| 253 | static int writeTarHeader(struct TarBallInfo *tbInfo, |
| 254 | const char *header_name, const char *fileName, struct stat *statbuf) |
| 255 | { |
| 256 | struct tar_header_t header; |
| 257 | |
| 258 | memset(&header, 0, sizeof(header)); |
| 259 | |
| 260 | strncpy(header.name, header_name, sizeof(header.name)); |
| 261 | |
| 262 | /* POSIX says to mask mode with 07777. */ |
| 263 | PUT_OCTAL(header.mode, statbuf->st_mode & 07777); |
| 264 | PUT_OCTAL(header.uid, statbuf->st_uid); |
| 265 | PUT_OCTAL(header.gid, statbuf->st_gid); |
| 266 | memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */ |
| 267 | /* users report that files with negative st_mtime cause trouble, so: */ |
| 268 | PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0); |
| 269 | |
| 270 | /* Enter the user and group names */ |
| 271 | safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname)); |
| 272 | safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname)); |
| 273 | |
| 274 | if (tbInfo->hlInfo) { |
| 275 | /* This is a hard link */ |
| 276 | header.typeflag = LNKTYPE; |
| 277 | strncpy(header.linkname, tbInfo->hlInfo->name, |
| 278 | sizeof(header.linkname)); |
| 279 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| 280 | /* Write out long linkname if needed */ |
| 281 | if (header.linkname[sizeof(header.linkname)-1]) |
| 282 | writeLongname(tbInfo->tarFd, GNULONGLINK, |
| 283 | tbInfo->hlInfo->name, 0); |
| 284 | #endif |
| 285 | } else if (S_ISLNK(statbuf->st_mode)) { |
| 286 | char *lpath = xmalloc_readlink_or_warn(fileName); |
| 287 | if (!lpath) |
| 288 | return FALSE; |
| 289 | header.typeflag = SYMTYPE; |
| 290 | strncpy(header.linkname, lpath, sizeof(header.linkname)); |
| 291 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| 292 | /* Write out long linkname if needed */ |
| 293 | if (header.linkname[sizeof(header.linkname)-1]) |
| 294 | writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0); |
| 295 | #else |
| 296 | /* If it is larger than 100 bytes, bail out */ |
| 297 | if (header.linkname[sizeof(header.linkname)-1]) { |
| 298 | free(lpath); |
| 299 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
| 300 | return FALSE; |
| 301 | } |
| 302 | #endif |
| 303 | free(lpath); |
| 304 | } else if (S_ISDIR(statbuf->st_mode)) { |
| 305 | header.typeflag = DIRTYPE; |
| 306 | /* Append '/' only if there is a space for it */ |
| 307 | if (!header.name[sizeof(header.name)-1]) |
| 308 | header.name[strlen(header.name)] = '/'; |
| 309 | } else if (S_ISCHR(statbuf->st_mode)) { |
| 310 | header.typeflag = CHRTYPE; |
| 311 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
| 312 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
| 313 | } else if (S_ISBLK(statbuf->st_mode)) { |
| 314 | header.typeflag = BLKTYPE; |
| 315 | PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
| 316 | PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
| 317 | } else if (S_ISFIFO(statbuf->st_mode)) { |
| 318 | header.typeflag = FIFOTYPE; |
| 319 | } else if (S_ISREG(statbuf->st_mode)) { |
| 320 | /* header.size field is 12 bytes long */ |
| 321 | /* Does octal-encoded size fit? */ |
| 322 | uoff_t filesize = statbuf->st_size; |
| 323 | if (sizeof(filesize) <= 4 |
| 324 | || filesize <= (uoff_t)0777777777777LL |
| 325 | ) { |
| 326 | PUT_OCTAL(header.size, filesize); |
| 327 | } |
| 328 | /* Does base256-encoded size fit? |
| 329 | * It always does unless off_t is wider than 64 bits. |
| 330 | */ |
| 331 | else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| 332 | #if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */ |
| 333 | && (filesize <= 0x3fffffffffffffffffffffffLL) |
| 334 | #endif |
| 335 | ) { |
| 336 | /* GNU tar uses "base-256 encoding" for very large numbers. |
| 337 | * Encoding is binary, with highest bit always set as a marker |
| 338 | * and sign in next-highest bit: |
| 339 | * 80 00 .. 00 - zero |
| 340 | * bf ff .. ff - largest positive number |
| 341 | * ff ff .. ff - minus 1 |
| 342 | * c0 00 .. 00 - smallest negative number |
| 343 | */ |
| 344 | char *p8 = header.size + sizeof(header.size); |
| 345 | do { |
| 346 | *--p8 = (uint8_t)filesize; |
| 347 | filesize >>= 8; |
| 348 | } while (p8 != header.size); |
| 349 | *p8 |= 0x80; |
| 350 | } else { |
| 351 | bb_error_msg_and_die("can't store file '%s' " |
| 352 | "of size %"OFF_FMT"u, aborting", |
| 353 | fileName, statbuf->st_size); |
| 354 | } |
| 355 | header.typeflag = REGTYPE; |
| 356 | } else { |
| 357 | bb_error_msg("%s: unknown file type", fileName); |
| 358 | return FALSE; |
| 359 | } |
| 360 | |
| 361 | #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| 362 | /* Write out long name if needed */ |
| 363 | /* (we, like GNU tar, output long linkname *before* long name) */ |
| 364 | if (header.name[sizeof(header.name)-1]) |
| 365 | writeLongname(tbInfo->tarFd, GNULONGNAME, |
| 366 | header_name, S_ISDIR(statbuf->st_mode)); |
| 367 | #endif |
| 368 | |
| 369 | /* Now write the header out to disk */ |
| 370 | chksum_and_xwrite(tbInfo->tarFd, &header); |
| 371 | |
| 372 | /* Now do the verbose thing (or not) */ |
| 373 | if (tbInfo->verboseFlag) { |
| 374 | FILE *vbFd = stdout; |
| 375 | |
| 376 | /* If archive goes to stdout, verbose goes to stderr */ |
| 377 | if (tbInfo->tarFd == STDOUT_FILENO) |
| 378 | vbFd = stderr; |
| 379 | /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */ |
| 380 | /* We don't have such excesses here: for us "v" == "vv" */ |
| 381 | /* '/' is probably a GNUism */ |
| 382 | fprintf(vbFd, "%s%s\n", header_name, |
| 383 | S_ISDIR(statbuf->st_mode) ? "/" : ""); |
| 384 | } |
| 385 | |
| 386 | return TRUE; |
| 387 | } |
| 388 | |
| 389 | #if ENABLE_FEATURE_TAR_FROM |
| 390 | static int exclude_file(const llist_t *excluded_files, const char *file) |
| 391 | { |
| 392 | while (excluded_files) { |
| 393 | if (excluded_files->data[0] == '/') { |
| 394 | if (fnmatch(excluded_files->data, file, |
| 395 | FNM_PATHNAME | FNM_LEADING_DIR) == 0) |
| 396 | return 1; |
| 397 | } else { |
| 398 | const char *p; |
| 399 | |
| 400 | for (p = file; p[0] != '\0'; p++) { |
| 401 | if ((p == file || p[-1] == '/') |
| 402 | && p[0] != '/' |
| 403 | && fnmatch(excluded_files->data, p, |
| 404 | FNM_PATHNAME | FNM_LEADING_DIR) == 0 |
| 405 | ) { |
| 406 | return 1; |
| 407 | } |
| 408 | } |
| 409 | } |
| 410 | excluded_files = excluded_files->link; |
| 411 | } |
| 412 | |
| 413 | return 0; |
| 414 | } |
| 415 | #else |
| 416 | # define exclude_file(excluded_files, file) 0 |
| 417 | #endif |
| 418 | |
| 419 | static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf, |
| 420 | void *userData, int depth UNUSED_PARAM) |
| 421 | { |
| 422 | struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; |
| 423 | const char *header_name; |
| 424 | int inputFileFd = -1; |
| 425 | |
| 426 | DBG("writeFileToTarball('%s')", fileName); |
| 427 | |
| 428 | /* Strip leading '/' and such (must be before memorizing hardlink's name) */ |
| 429 | header_name = strip_unsafe_prefix(fileName); |
| 430 | |
| 431 | if (header_name[0] == '\0') |
| 432 | return TRUE; |
| 433 | |
| 434 | /* It is against the rules to archive a socket */ |
| 435 | if (S_ISSOCK(statbuf->st_mode)) { |
| 436 | bb_error_msg("%s: socket ignored", fileName); |
| 437 | return TRUE; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Check to see if we are dealing with a hard link. |
| 442 | * If so - |
| 443 | * Treat the first occurance of a given dev/inode as a file while |
| 444 | * treating any additional occurances as hard links. This is done |
| 445 | * by adding the file information to the HardLinkInfo linked list. |
| 446 | */ |
| 447 | tbInfo->hlInfo = NULL; |
| 448 | if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) { |
| 449 | DBG("'%s': st_nlink > 1", header_name); |
| 450 | tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf); |
| 451 | if (tbInfo->hlInfo == NULL) { |
| 452 | DBG("'%s': addHardLinkInfo", header_name); |
| 453 | addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /* It is a bad idea to store the archive we are in the process of creating, |
| 458 | * so check the device and inode to be sure that this particular file isn't |
| 459 | * the new tarball */ |
| 460 | if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev |
| 461 | && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino |
| 462 | ) { |
| 463 | bb_error_msg("%s: file is the archive; skipping", fileName); |
| 464 | return TRUE; |
| 465 | } |
| 466 | |
| 467 | if (exclude_file(tbInfo->excludeList, header_name)) |
| 468 | return SKIP; |
| 469 | |
| 470 | #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| 471 | if (strlen(header_name) >= NAME_SIZE) { |
| 472 | bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
| 473 | return TRUE; |
| 474 | } |
| 475 | #endif |
| 476 | |
| 477 | /* Is this a regular file? */ |
| 478 | if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) { |
| 479 | /* open the file we want to archive, and make sure all is well */ |
| 480 | inputFileFd = open_or_warn(fileName, O_RDONLY); |
| 481 | if (inputFileFd < 0) { |
| 482 | return FALSE; |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | /* Add an entry to the tarball */ |
| 487 | if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) { |
| 488 | return FALSE; |
| 489 | } |
| 490 | |
| 491 | /* If it was a regular file, write out the body */ |
| 492 | if (inputFileFd >= 0) { |
| 493 | size_t readSize; |
| 494 | /* Write the file to the archive. */ |
| 495 | /* We record size into header first, */ |
| 496 | /* and then write out file. If file shrinks in between, */ |
| 497 | /* tar will be corrupted. So we don't allow for that. */ |
| 498 | /* NB: GNU tar 1.16 warns and pads with zeroes */ |
| 499 | /* or even seeks back and updates header */ |
| 500 | bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
| 501 | ////off_t readSize; |
| 502 | ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
| 503 | ////if (readSize != statbuf->st_size && readSize >= 0) { |
| 504 | //// bb_error_msg_and_die("short read from %s, aborting", fileName); |
| 505 | ////} |
| 506 | |
| 507 | /* Check that file did not grow in between? */ |
| 508 | /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */ |
| 509 | |
| 510 | close(inputFileFd); |
| 511 | |
| 512 | /* Pad the file up to the tar block size */ |
| 513 | /* (a few tricks here in the name of code size) */ |
| 514 | readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1); |
| 515 | memset(block_buf, 0, readSize); |
| 516 | xwrite(tbInfo->tarFd, block_buf, readSize); |
| 517 | } |
| 518 | |
| 519 | return TRUE; |
| 520 | } |
| 521 | |
| 522 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
| 523 | # if !(ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2) |
| 524 | # define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd) |
| 525 | # endif |
| 526 | /* Don't inline: vfork scares gcc and pessimizes code */ |
| 527 | static void NOINLINE vfork_compressor(int tar_fd, int gzip) |
| 528 | { |
| 529 | pid_t gzipPid; |
| 530 | # if ENABLE_FEATURE_SEAMLESS_GZ && ENABLE_FEATURE_SEAMLESS_BZ2 |
| 531 | const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; |
| 532 | # elif ENABLE_FEATURE_SEAMLESS_GZ |
| 533 | const char *zip_exec = "gzip"; |
| 534 | # else /* only ENABLE_FEATURE_SEAMLESS_BZ2 */ |
| 535 | const char *zip_exec = "bzip2"; |
| 536 | # endif |
| 537 | // On Linux, vfork never unpauses parent early, although standard |
| 538 | // allows for that. Do we want to waste bytes checking for it? |
| 539 | # define WAIT_FOR_CHILD 0 |
| 540 | volatile int vfork_exec_errno = 0; |
| 541 | struct fd_pair gzipDataPipe; |
| 542 | # if WAIT_FOR_CHILD |
| 543 | struct fd_pair gzipStatusPipe; |
| 544 | xpiped_pair(gzipStatusPipe); |
| 545 | # endif |
| 546 | xpiped_pair(gzipDataPipe); |
| 547 | |
| 548 | signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ |
| 549 | |
| 550 | # if defined(__GNUC__) && __GNUC__ |
| 551 | /* Avoid vfork clobbering */ |
| 552 | (void) &zip_exec; |
| 553 | # endif |
| 554 | |
| 555 | gzipPid = xvfork(); |
| 556 | |
| 557 | if (gzipPid == 0) { |
| 558 | /* child */ |
| 559 | /* NB: close _first_, then move fds! */ |
| 560 | close(gzipDataPipe.wr); |
| 561 | # if WAIT_FOR_CHILD |
| 562 | close(gzipStatusPipe.rd); |
| 563 | /* gzipStatusPipe.wr will close only on exec - |
| 564 | * parent waits for this close to happen */ |
| 565 | fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC); |
| 566 | # endif |
| 567 | xmove_fd(gzipDataPipe.rd, 0); |
| 568 | xmove_fd(tar_fd, 1); |
| 569 | /* exec gzip/bzip2 program/applet */ |
| 570 | BB_EXECLP(zip_exec, zip_exec, "-f", NULL); |
| 571 | vfork_exec_errno = errno; |
| 572 | _exit(EXIT_FAILURE); |
| 573 | } |
| 574 | |
| 575 | /* parent */ |
| 576 | xmove_fd(gzipDataPipe.wr, tar_fd); |
| 577 | close(gzipDataPipe.rd); |
| 578 | # if WAIT_FOR_CHILD |
| 579 | close(gzipStatusPipe.wr); |
| 580 | while (1) { |
| 581 | char buf; |
| 582 | int n; |
| 583 | |
| 584 | /* Wait until child execs (or fails to) */ |
| 585 | n = full_read(gzipStatusPipe.rd, &buf, 1); |
| 586 | if (n < 0 /* && errno == EAGAIN */) |
| 587 | continue; /* try it again */ |
| 588 | } |
| 589 | close(gzipStatusPipe.rd); |
| 590 | # endif |
| 591 | if (vfork_exec_errno) { |
| 592 | errno = vfork_exec_errno; |
| 593 | bb_perror_msg_and_die("can't execute '%s'", zip_exec); |
| 594 | } |
| 595 | } |
| 596 | #endif /* ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 */ |
| 597 | |
| 598 | |
| 599 | /* gcc 4.2.1 inlines it, making code bigger */ |
| 600 | static NOINLINE int writeTarFile(int tar_fd, int verboseFlag, |
| 601 | int recurseFlags, const llist_t *include, |
| 602 | const llist_t *exclude, int gzip) |
| 603 | { |
| 604 | int errorFlag = FALSE; |
| 605 | struct TarBallInfo tbInfo; |
| 606 | |
| 607 | tbInfo.hlInfoHead = NULL; |
| 608 | tbInfo.tarFd = tar_fd; |
| 609 | tbInfo.verboseFlag = verboseFlag; |
| 610 | |
| 611 | /* Store the stat info for the tarball's file, so |
| 612 | * can avoid including the tarball into itself.... */ |
| 613 | xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file"); |
| 614 | |
| 615 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
| 616 | if (gzip) |
| 617 | vfork_compressor(tbInfo.tarFd, gzip); |
| 618 | #endif |
| 619 | |
| 620 | tbInfo.excludeList = exclude; |
| 621 | |
| 622 | /* Read the directory/files and iterate over them one at a time */ |
| 623 | while (include) { |
| 624 | if (!recursive_action(include->data, recurseFlags, |
| 625 | writeFileToTarball, writeFileToTarball, &tbInfo, 0) |
| 626 | ) { |
| 627 | errorFlag = TRUE; |
| 628 | } |
| 629 | include = include->link; |
| 630 | } |
| 631 | /* Write two empty blocks to the end of the archive */ |
| 632 | memset(block_buf, 0, 2*TAR_BLOCK_SIZE); |
| 633 | xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE); |
| 634 | |
| 635 | /* To be pedantically correct, we would check if the tarball |
| 636 | * is smaller than 20 tar blocks, and pad it if it was smaller, |
| 637 | * but that isn't necessary for GNU tar interoperability, and |
| 638 | * so is considered a waste of space */ |
| 639 | |
| 640 | /* Close so the child process (if any) will exit */ |
| 641 | close(tbInfo.tarFd); |
| 642 | |
| 643 | /* Hang up the tools, close up shop, head home */ |
| 644 | if (ENABLE_FEATURE_CLEAN_UP) |
| 645 | freeHardLinkInfo(&tbInfo.hlInfoHead); |
| 646 | |
| 647 | if (errorFlag) |
| 648 | bb_error_msg("error exit delayed from previous errors"); |
| 649 | |
| 650 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
| 651 | if (gzip) { |
| 652 | int status; |
| 653 | if (safe_waitpid(-1, &status, 0) == -1) |
| 654 | bb_perror_msg("waitpid"); |
| 655 | else if (!WIFEXITED(status) || WEXITSTATUS(status)) |
| 656 | /* gzip was killed or has exited with nonzero! */ |
| 657 | errorFlag = TRUE; |
| 658 | } |
| 659 | #endif |
| 660 | return errorFlag; |
| 661 | } |
| 662 | #else |
| 663 | int writeTarFile(int tar_fd, int verboseFlag, |
| 664 | int recurseFlags, const llist_t *include, |
| 665 | const llist_t *exclude, int gzip); |
| 666 | #endif /* FEATURE_TAR_CREATE */ |
| 667 | |
| 668 | #if ENABLE_FEATURE_TAR_FROM |
| 669 | static llist_t *append_file_list_to_list(llist_t *list) |
| 670 | { |
| 671 | FILE *src_stream; |
| 672 | char *line; |
| 673 | llist_t *newlist = NULL; |
| 674 | |
| 675 | while (list) { |
| 676 | src_stream = xfopen_stdin(llist_pop(&list)); |
| 677 | while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
| 678 | /* kill trailing '/' unless the string is just "/" */ |
| 679 | char *cp = last_char_is(line, '/'); |
| 680 | if (cp > line) |
| 681 | *cp = '\0'; |
| 682 | llist_add_to(&newlist, line); |
| 683 | } |
| 684 | fclose(src_stream); |
| 685 | } |
| 686 | return newlist; |
| 687 | } |
| 688 | #else |
| 689 | # define append_file_list_to_list(x) 0 |
| 690 | #endif |
| 691 | |
| 692 | //usage:#define tar_trivial_usage |
| 693 | //usage: "-[" IF_FEATURE_TAR_CREATE("c") "xt" |
| 694 | //usage: IF_FEATURE_SEAMLESS_Z("Z") |
| 695 | //usage: IF_FEATURE_SEAMLESS_GZ("z") |
| 696 | //usage: IF_FEATURE_SEAMLESS_XZ("J") |
| 697 | //usage: IF_FEATURE_SEAMLESS_BZ2("j") |
| 698 | //usage: IF_FEATURE_SEAMLESS_LZMA("a") |
| 699 | //usage: IF_FEATURE_TAR_CREATE("h") |
| 700 | //usage: IF_FEATURE_TAR_NOPRESERVE_TIME("m") |
| 701 | //usage: "vO] " |
| 702 | //usage: IF_FEATURE_TAR_FROM("[-X FILE] [-T FILE] ") |
| 703 | //usage: "[-f TARFILE] [-C DIR] [FILE]..." |
| 704 | //usage:#define tar_full_usage "\n\n" |
| 705 | //usage: IF_FEATURE_TAR_CREATE("Create, extract, ") |
| 706 | //usage: IF_NOT_FEATURE_TAR_CREATE("Extract ") |
| 707 | //usage: "or list files from a tar file\n" |
| 708 | //usage: "\nOperation:" |
| 709 | //usage: IF_FEATURE_TAR_CREATE( |
| 710 | //usage: "\n c Create" |
| 711 | //usage: ) |
| 712 | //usage: "\n x Extract" |
| 713 | //usage: "\n t List" |
| 714 | //usage: "\n f Name of TARFILE ('-' for stdin/out)" |
| 715 | //usage: "\n C Change to DIR before operation" |
| 716 | //usage: "\n v Verbose" |
| 717 | //usage: IF_FEATURE_SEAMLESS_Z( |
| 718 | //usage: "\n Z (De)compress using compress" |
| 719 | //usage: ) |
| 720 | //usage: IF_FEATURE_SEAMLESS_GZ( |
| 721 | //usage: "\n z (De)compress using gzip" |
| 722 | //usage: ) |
| 723 | //usage: IF_FEATURE_SEAMLESS_XZ( |
| 724 | //usage: "\n J (De)compress using xz" |
| 725 | //usage: ) |
| 726 | //usage: IF_FEATURE_SEAMLESS_BZ2( |
| 727 | //usage: "\n j (De)compress using bzip2" |
| 728 | //usage: ) |
| 729 | //usage: IF_FEATURE_SEAMLESS_LZMA( |
| 730 | //usage: "\n a (De)compress using lzma" |
| 731 | //usage: ) |
| 732 | //usage: "\n O Extract to stdout" |
| 733 | //usage: IF_FEATURE_TAR_CREATE( |
| 734 | //usage: "\n h Follow symlinks" |
| 735 | //usage: ) |
| 736 | //usage: IF_FEATURE_TAR_NOPRESERVE_TIME( |
| 737 | //usage: "\n m Don't restore mtime" |
| 738 | //usage: ) |
| 739 | //usage: IF_FEATURE_TAR_FROM( |
| 740 | //usage: IF_FEATURE_TAR_LONG_OPTIONS( |
| 741 | //usage: "\n exclude File to exclude" |
| 742 | //usage: ) |
| 743 | //usage: "\n X File with names to exclude" |
| 744 | //usage: "\n T File with names to include" |
| 745 | //usage: ) |
| 746 | //usage: |
| 747 | //usage:#define tar_example_usage |
| 748 | //usage: "$ zcat /tmp/tarball.tar.gz | tar -xf -\n" |
| 749 | //usage: "$ tar -cf /tmp/tarball.tar /usr/local\n" |
| 750 | |
| 751 | // Supported but aren't in --help: |
| 752 | // o no-same-owner |
| 753 | // p same-permissions |
| 754 | // k keep-old |
| 755 | // no-recursion |
| 756 | // numeric-owner |
| 757 | // no-same-permissions |
| 758 | // overwrite |
| 759 | //IF_FEATURE_TAR_TO_COMMAND( |
| 760 | // to-command |
| 761 | //) |
| 762 | |
| 763 | enum { |
| 764 | OPTBIT_KEEP_OLD = 8, |
| 765 | IF_FEATURE_TAR_CREATE( OPTBIT_CREATE ,) |
| 766 | IF_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,) |
| 767 | IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2 ,) |
| 768 | IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA ,) |
| 769 | IF_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,) |
| 770 | IF_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,) |
| 771 | IF_FEATURE_SEAMLESS_GZ( OPTBIT_GZIP ,) |
| 772 | IF_FEATURE_SEAMLESS_XZ( OPTBIT_XZ ,) // 16th bit |
| 773 | IF_FEATURE_SEAMLESS_Z( OPTBIT_COMPRESS ,) |
| 774 | IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,) |
| 775 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
| 776 | OPTBIT_NORECURSION, |
| 777 | IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND ,) |
| 778 | OPTBIT_NUMERIC_OWNER, |
| 779 | OPTBIT_NOPRESERVE_PERM, |
| 780 | OPTBIT_OVERWRITE, |
| 781 | #endif |
| 782 | OPT_TEST = 1 << 0, // t |
| 783 | OPT_EXTRACT = 1 << 1, // x |
| 784 | OPT_BASEDIR = 1 << 2, // C |
| 785 | OPT_TARNAME = 1 << 3, // f |
| 786 | OPT_2STDOUT = 1 << 4, // O |
| 787 | OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner |
| 788 | OPT_P = 1 << 6, // p |
| 789 | OPT_VERBOSE = 1 << 7, // v |
| 790 | OPT_KEEP_OLD = 1 << 8, // k |
| 791 | OPT_CREATE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_CREATE )) + 0, // c |
| 792 | OPT_DEREFERENCE = IF_FEATURE_TAR_CREATE( (1 << OPTBIT_DEREFERENCE )) + 0, // h |
| 793 | OPT_BZIP2 = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2 )) + 0, // j |
| 794 | OPT_LZMA = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA )) + 0, // a |
| 795 | OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_INCLUDE_FROM)) + 0, // T |
| 796 | OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM( (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X |
| 797 | OPT_GZIP = IF_FEATURE_SEAMLESS_GZ( (1 << OPTBIT_GZIP )) + 0, // z |
| 798 | OPT_XZ = IF_FEATURE_SEAMLESS_XZ( (1 << OPTBIT_XZ )) + 0, // J |
| 799 | OPT_COMPRESS = IF_FEATURE_SEAMLESS_Z( (1 << OPTBIT_COMPRESS )) + 0, // Z |
| 800 | OPT_NOPRESERVE_TIME = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m |
| 801 | OPT_NORECURSION = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION )) + 0, // no-recursion |
| 802 | OPT_2COMMAND = IF_FEATURE_TAR_TO_COMMAND( (1 << OPTBIT_2COMMAND )) + 0, // to-command |
| 803 | OPT_NUMERIC_OWNER = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER )) + 0, // numeric-owner |
| 804 | OPT_NOPRESERVE_PERM = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions |
| 805 | OPT_OVERWRITE = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE )) + 0, // overwrite |
| 806 | |
| 807 | OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS), |
| 808 | }; |
| 809 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
| 810 | static const char tar_longopts[] ALIGN1 = |
| 811 | "list\0" No_argument "t" |
| 812 | "extract\0" No_argument "x" |
| 813 | "directory\0" Required_argument "C" |
| 814 | "file\0" Required_argument "f" |
| 815 | "to-stdout\0" No_argument "O" |
| 816 | /* do not restore owner */ |
| 817 | /* Note: GNU tar handles 'o' as no-same-owner only on extract, |
| 818 | * on create, 'o' is --old-archive. We do not support --old-archive. */ |
| 819 | "no-same-owner\0" No_argument "o" |
| 820 | "same-permissions\0" No_argument "p" |
| 821 | "verbose\0" No_argument "v" |
| 822 | "keep-old\0" No_argument "k" |
| 823 | # if ENABLE_FEATURE_TAR_CREATE |
| 824 | "create\0" No_argument "c" |
| 825 | "dereference\0" No_argument "h" |
| 826 | # endif |
| 827 | # if ENABLE_FEATURE_SEAMLESS_BZ2 |
| 828 | "bzip2\0" No_argument "j" |
| 829 | # endif |
| 830 | # if ENABLE_FEATURE_SEAMLESS_LZMA |
| 831 | "lzma\0" No_argument "a" |
| 832 | # endif |
| 833 | # if ENABLE_FEATURE_TAR_FROM |
| 834 | "files-from\0" Required_argument "T" |
| 835 | "exclude-from\0" Required_argument "X" |
| 836 | # endif |
| 837 | # if ENABLE_FEATURE_SEAMLESS_GZ |
| 838 | "gzip\0" No_argument "z" |
| 839 | # endif |
| 840 | # if ENABLE_FEATURE_SEAMLESS_XZ |
| 841 | "xz\0" No_argument "J" |
| 842 | # endif |
| 843 | # if ENABLE_FEATURE_SEAMLESS_Z |
| 844 | "compress\0" No_argument "Z" |
| 845 | # endif |
| 846 | # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME |
| 847 | "touch\0" No_argument "m" |
| 848 | # endif |
| 849 | "no-recursion\0" No_argument "\xfa" |
| 850 | # if ENABLE_FEATURE_TAR_TO_COMMAND |
| 851 | "to-command\0" Required_argument "\xfb" |
| 852 | # endif |
| 853 | /* use numeric uid/gid from tar header, not textual */ |
| 854 | "numeric-owner\0" No_argument "\xfc" |
| 855 | /* do not restore mode */ |
| 856 | "no-same-permissions\0" No_argument "\xfd" |
| 857 | /* on unpack, open with O_TRUNC and !O_EXCL */ |
| 858 | "overwrite\0" No_argument "\xfe" |
| 859 | /* --exclude takes next bit position in option mask, */ |
| 860 | /* therefore we have to put it _after_ --no-same-permissions */ |
| 861 | # if ENABLE_FEATURE_TAR_FROM |
| 862 | "exclude\0" Required_argument "\xff" |
| 863 | # endif |
| 864 | ; |
| 865 | #endif |
| 866 | |
| 867 | int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 868 | int tar_main(int argc UNUSED_PARAM, char **argv) |
| 869 | { |
| 870 | archive_handle_t *tar_handle; |
| 871 | char *base_dir = NULL; |
| 872 | const char *tar_filename = "-"; |
| 873 | unsigned opt; |
| 874 | int verboseFlag = 0; |
| 875 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
| 876 | llist_t *excludes = NULL; |
| 877 | #endif |
| 878 | |
| 879 | /* Initialise default values */ |
| 880 | tar_handle = init_handle(); |
| 881 | tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS |
| 882 | | ARCHIVE_RESTORE_DATE |
| 883 | | ARCHIVE_UNLINK_OLD; |
| 884 | |
| 885 | /* Apparently only root's tar preserves perms (see bug 3844) */ |
| 886 | if (getuid() != 0) |
| 887 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
| 888 | |
| 889 | /* Prepend '-' to the first argument if required */ |
| 890 | opt_complementary = "--:" // first arg is options |
| 891 | "tt:vv:" // count -t,-v |
| 892 | IF_FEATURE_TAR_FROM("X::T::") // cumulative lists |
| 893 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
| 894 | "\xff::" // cumulative lists for --exclude |
| 895 | #endif |
| 896 | IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd |
| 897 | IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive |
| 898 | IF_NOT_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive |
| 899 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
| 900 | applet_long_options = tar_longopts; |
| 901 | #endif |
| 902 | #if ENABLE_DESKTOP |
| 903 | if (argv[1] && argv[1][0] != '-') { |
| 904 | /* Compat: |
| 905 | * 1st argument without dash handles options with parameters |
| 906 | * differently from dashed one: it takes *next argv[i]* |
| 907 | * as paramenter even if there are more chars in 1st argument: |
| 908 | * "tar fx TARFILE" - "x" is not taken as f's param |
| 909 | * but is interpreted as -x option |
| 910 | * "tar -xf TARFILE" - dashed equivalent of the above |
| 911 | * "tar -fx ..." - "x" is taken as f's param |
| 912 | * getopt32 wouldn't handle 1st command correctly. |
| 913 | * Unfortunately, people do use such commands. |
| 914 | * We massage argv[1] to work around it by moving 'f' |
| 915 | * to the end of the string. |
| 916 | * More contrived "tar fCx TARFILE DIR" still fails, |
| 917 | * but such commands are much less likely to be used. |
| 918 | */ |
| 919 | char *f = strchr(argv[1], 'f'); |
| 920 | if (f) { |
| 921 | while (f[1] != '\0') { |
| 922 | *f = f[1]; |
| 923 | f++; |
| 924 | } |
| 925 | *f = 'f'; |
| 926 | } |
| 927 | } |
| 928 | #endif |
| 929 | opt = getopt32(argv, |
| 930 | "txC:f:Oopvk" |
| 931 | IF_FEATURE_TAR_CREATE( "ch" ) |
| 932 | IF_FEATURE_SEAMLESS_BZ2( "j" ) |
| 933 | IF_FEATURE_SEAMLESS_LZMA("a" ) |
| 934 | IF_FEATURE_TAR_FROM( "T:X:") |
| 935 | IF_FEATURE_SEAMLESS_GZ( "z" ) |
| 936 | IF_FEATURE_SEAMLESS_XZ( "J" ) |
| 937 | IF_FEATURE_SEAMLESS_Z( "Z" ) |
| 938 | IF_FEATURE_TAR_NOPRESERVE_TIME("m") |
| 939 | , &base_dir // -C dir |
| 940 | , &tar_filename // -f filename |
| 941 | IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T |
| 942 | IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X |
| 943 | IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command |
| 944 | #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
| 945 | , &excludes // --exclude |
| 946 | #endif |
| 947 | , &verboseFlag // combined count for -t and -v |
| 948 | , &verboseFlag // combined count for -t and -v |
| 949 | ); |
| 950 | //bb_error_msg("opt:%08x", opt); |
| 951 | argv += optind; |
| 952 | |
| 953 | if (verboseFlag) tar_handle->action_header = header_verbose_list; |
| 954 | if (verboseFlag == 1) tar_handle->action_header = header_list; |
| 955 | |
| 956 | if (opt & OPT_EXTRACT) |
| 957 | tar_handle->action_data = data_extract_all; |
| 958 | |
| 959 | if (opt & OPT_2STDOUT) |
| 960 | tar_handle->action_data = data_extract_to_stdout; |
| 961 | |
| 962 | if (opt & OPT_2COMMAND) { |
| 963 | putenv((char*)"TAR_FILETYPE=f"); |
| 964 | signal(SIGPIPE, SIG_IGN); |
| 965 | tar_handle->action_data = data_extract_to_command; |
| 966 | IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());) |
| 967 | } |
| 968 | |
| 969 | if (opt & OPT_KEEP_OLD) |
| 970 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; |
| 971 | |
| 972 | if (opt & OPT_NUMERIC_OWNER) |
| 973 | tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER; |
| 974 | |
| 975 | if (opt & OPT_NOPRESERVE_OWNER) |
| 976 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER; |
| 977 | |
| 978 | if (opt & OPT_NOPRESERVE_PERM) |
| 979 | tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM; |
| 980 | |
| 981 | if (opt & OPT_OVERWRITE) { |
| 982 | tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD; |
| 983 | tar_handle->ah_flags |= ARCHIVE_O_TRUNC; |
| 984 | } |
| 985 | |
| 986 | if (opt & OPT_NOPRESERVE_TIME) |
| 987 | tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE; |
| 988 | |
| 989 | #if ENABLE_FEATURE_TAR_FROM |
| 990 | tar_handle->reject = append_file_list_to_list(tar_handle->reject); |
| 991 | # if ENABLE_FEATURE_TAR_LONG_OPTIONS |
| 992 | /* Append excludes to reject */ |
| 993 | while (excludes) { |
| 994 | llist_t *next = excludes->link; |
| 995 | excludes->link = tar_handle->reject; |
| 996 | tar_handle->reject = excludes; |
| 997 | excludes = next; |
| 998 | } |
| 999 | # endif |
| 1000 | tar_handle->accept = append_file_list_to_list(tar_handle->accept); |
| 1001 | #endif |
| 1002 | |
| 1003 | /* Setup an array of filenames to work with */ |
| 1004 | /* TODO: This is the same as in ar, make a separate function? */ |
| 1005 | while (*argv) { |
| 1006 | /* kill trailing '/' unless the string is just "/" */ |
| 1007 | char *cp = last_char_is(*argv, '/'); |
| 1008 | if (cp > *argv) |
| 1009 | *cp = '\0'; |
| 1010 | llist_add_to_end(&tar_handle->accept, *argv); |
| 1011 | argv++; |
| 1012 | } |
| 1013 | |
| 1014 | if (tar_handle->accept || tar_handle->reject) |
| 1015 | tar_handle->filter = filter_accept_reject_list; |
| 1016 | |
| 1017 | /* Open the tar file */ |
| 1018 | { |
| 1019 | int tar_fd = STDIN_FILENO; |
| 1020 | int flags = O_RDONLY; |
| 1021 | |
| 1022 | if (opt & OPT_CREATE) { |
| 1023 | /* Make sure there is at least one file to tar up */ |
| 1024 | if (tar_handle->accept == NULL) |
| 1025 | bb_error_msg_and_die("empty archive"); |
| 1026 | |
| 1027 | tar_fd = STDOUT_FILENO; |
| 1028 | /* Mimicking GNU tar 1.15.1: */ |
| 1029 | flags = O_WRONLY | O_CREAT | O_TRUNC; |
| 1030 | } |
| 1031 | |
| 1032 | if (LONE_DASH(tar_filename)) { |
| 1033 | tar_handle->src_fd = tar_fd; |
| 1034 | tar_handle->seek = seek_by_read; |
| 1035 | } else { |
| 1036 | if (ENABLE_FEATURE_TAR_AUTODETECT |
| 1037 | && flags == O_RDONLY |
| 1038 | && !(opt & OPT_ANY_COMPRESS) |
| 1039 | ) { |
| 1040 | tar_handle->src_fd = open_zipped(tar_filename); |
| 1041 | if (tar_handle->src_fd < 0) |
| 1042 | bb_perror_msg_and_die("can't open '%s'", tar_filename); |
| 1043 | } else { |
| 1044 | tar_handle->src_fd = xopen(tar_filename, flags); |
| 1045 | } |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | if (base_dir) |
| 1050 | xchdir(base_dir); |
| 1051 | |
| 1052 | //if (SEAMLESS_COMPRESSION || OPT_COMPRESS) |
| 1053 | // /* We need to know whether child (gzip/bzip/etc) exits abnormally */ |
| 1054 | // signal(SIGCHLD, check_errors_in_children); |
| 1055 | |
| 1056 | /* Create an archive */ |
| 1057 | if (opt & OPT_CREATE) { |
| 1058 | #if ENABLE_FEATURE_SEAMLESS_GZ || ENABLE_FEATURE_SEAMLESS_BZ2 |
| 1059 | int zipMode = 0; |
| 1060 | if (ENABLE_FEATURE_SEAMLESS_GZ && (opt & OPT_GZIP)) |
| 1061 | zipMode = 1; |
| 1062 | if (ENABLE_FEATURE_SEAMLESS_BZ2 && (opt & OPT_BZIP2)) |
| 1063 | zipMode = 2; |
| 1064 | #endif |
| 1065 | /* NB: writeTarFile() closes tar_handle->src_fd */ |
| 1066 | return writeTarFile(tar_handle->src_fd, verboseFlag, |
| 1067 | (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0) |
| 1068 | | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE), |
| 1069 | tar_handle->accept, |
| 1070 | tar_handle->reject, zipMode); |
| 1071 | } |
| 1072 | |
| 1073 | if (opt & OPT_ANY_COMPRESS) { |
| 1074 | USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_aux_data_t *aux, int src_fd, int dst_fd);) |
| 1075 | USE_FOR_NOMMU(const char *xformer_prog;) |
| 1076 | |
| 1077 | if (opt & OPT_COMPRESS) |
| 1078 | USE_FOR_MMU(xformer = unpack_Z_stream;) |
| 1079 | USE_FOR_NOMMU(xformer_prog = "uncompress";) |
| 1080 | if (opt & OPT_GZIP) |
| 1081 | USE_FOR_MMU(xformer = unpack_gz_stream;) |
| 1082 | USE_FOR_NOMMU(xformer_prog = "gunzip";) |
| 1083 | if (opt & OPT_BZIP2) |
| 1084 | USE_FOR_MMU(xformer = unpack_bz2_stream;) |
| 1085 | USE_FOR_NOMMU(xformer_prog = "bunzip2";) |
| 1086 | if (opt & OPT_LZMA) |
| 1087 | USE_FOR_MMU(xformer = unpack_lzma_stream;) |
| 1088 | USE_FOR_NOMMU(xformer_prog = "unlzma";) |
| 1089 | if (opt & OPT_XZ) |
| 1090 | USE_FOR_MMU(xformer = unpack_xz_stream;) |
| 1091 | USE_FOR_NOMMU(xformer_prog = "unxz";) |
| 1092 | |
| 1093 | open_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog); |
| 1094 | /* Can't lseek over pipes */ |
| 1095 | tar_handle->seek = seek_by_read; |
| 1096 | /*tar_handle->offset = 0; - already is */ |
| 1097 | } |
| 1098 | |
| 1099 | while (get_header_tar(tar_handle) == EXIT_SUCCESS) |
| 1100 | continue; |
| 1101 | |
| 1102 | /* Check that every file that should have been extracted was */ |
| 1103 | while (tar_handle->accept) { |
| 1104 | if (!find_list_entry(tar_handle->reject, tar_handle->accept->data) |
| 1105 | && !find_list_entry(tar_handle->passed, tar_handle->accept->data) |
| 1106 | ) { |
| 1107 | bb_error_msg_and_die("%s: not found in archive", |
| 1108 | tar_handle->accept->data); |
| 1109 | } |
| 1110 | tar_handle->accept = tar_handle->accept->link; |
| 1111 | } |
| 1112 | if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */) |
| 1113 | close(tar_handle->src_fd); |
| 1114 | |
| 1115 | if (SEAMLESS_COMPRESSION || OPT_COMPRESS) { |
| 1116 | check_errors_in_children(0); |
| 1117 | return bb_got_signal; |
| 1118 | } |
| 1119 | return EXIT_SUCCESS; |
| 1120 | } |