archival/tar.c

   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 /* TODO: security with -C DESTDIR option can be enhanced.
  26  * Consider tar file created via:
  27  * $ tar cvf bug.tar anything.txt
  28  * $ ln -s /tmp symlink
  29  * $ tar --append -f bug.tar symlink
  30  * $ rm symlink
  31  * $ mkdir symlink
  32  * $ tar --append -f bug.tar symlink/evil.py
  33  *
  34  * This will result in an archive which contains:
  35  * $ tar --list -f bug.tar
  36  * anything.txt
  37  * symlink
  38  * symlink/evil.py
  39  *
  40  * Untarring it puts evil.py in '/tmp' even if the -C DESTDIR is given.
  41  * This doesn't feel right, and IIRC GNU tar doesn't do that.
  42  */
  43
  44 //config:config TAR
  45 //config:       bool "tar"
  46 //config:       default y
  47 //config:       help
  48 //config:         tar is an archiving program. It's commonly used with gzip to
  49 //config:         create compressed archives. It's probably the most widely used
  50 //config:         UNIX archive program.
  51 //config:
  52 //config:config FEATURE_TAR_LONG_OPTIONS
  53 //config:       bool "Enable long options"
  54 //config:       default y
  55 //config:       depends on TAR && LONG_OPTS
  56 //config:
  57 //config:config FEATURE_TAR_CREATE
  58 //config:       bool "Enable -c (archive creation)"
  59 //config:       default y
  60 //config:       depends on TAR
  61 //config:
  62 //config:config FEATURE_TAR_AUTODETECT
  63 //config:       bool "Autodetect compressed tarballs"
  64 //config:       default y
  65 //config:       depends on TAR && (FEATURE_SEAMLESS_Z || FEATURE_SEAMLESS_GZ || FEATURE_SEAMLESS_BZ2 || FEATURE_SEAMLESS_LZMA || FEATURE_SEAMLESS_XZ)
  66 //config:       help
  67 //config:         With this option tar can automatically detect compressed
  68 //config:         tarballs. Currently it works only on files (not pipes etc).
  69 //config:
  70 //config:config FEATURE_TAR_FROM
  71 //config:       bool "Enable -X (exclude from) and -T (include from) options)"
  72 //config:       default y
  73 //config:       depends on TAR
  74 //config:       help
  75 //config:         If you enable this option you'll be able to specify
  76 //config:         a list of files to include or exclude from an archive.
  77 //config:
  78 //config:config FEATURE_TAR_OLDGNU_COMPATIBILITY
  79 //config:       bool "Support old tar header format"
  80 //config:       default y
  81 //config:       depends on TAR || DPKG
  82 //config:       help
  83 //config:         This option is required to unpack archives created in
  84 //config:         the old GNU format; help to kill this old format by
  85 //config:         repacking your ancient archives with the new format.
  86 //config:
  87 //config:config FEATURE_TAR_OLDSUN_COMPATIBILITY
  88 //config:       bool "Enable untarring of tarballs with checksums produced by buggy Sun tar"
  89 //config:       default y
  90 //config:       depends on TAR || DPKG
  91 //config:       help
  92 //config:         This option is required to unpack archives created by some old
  93 //config:         version of Sun's tar (it was calculating checksum using signed
  94 //config:         arithmetic). It is said to be fixed in newer Sun tar, but "old"
  95 //config:         tarballs still exist.
  96 //config:
  97 //config:config FEATURE_TAR_GNU_EXTENSIONS
  98 //config:       bool "Support GNU tar extensions (long filenames)"
  99 //config:       default y
 100 //config:       depends on TAR || DPKG
 101 //config:
 102 //config:config FEATURE_TAR_TO_COMMAND
 103 //config:       bool "Support writing to an external program (--to-command)"
 104 //config:       default y
 105 //config:       depends on TAR && FEATURE_TAR_LONG_OPTIONS
 106 //config:       help
 107 //config:         If you enable this option you'll be able to instruct tar to send
 108 //config:         the contents of each extracted file to the standard input of an
 109 //config:         external program.
 110 //config:
 111 //config:config FEATURE_TAR_UNAME_GNAME
 112 //config:       bool "Enable use of user and group names"
 113 //config:       default y
 114 //config:       depends on TAR
 115 //config:       help
 116 //config:         Enable use of user and group names in tar. This affects contents
 117 //config:         listings (-t) and preserving permissions when unpacking (-p).
 118 //config:         +200 bytes.
 119 //config:
 120 //config:config FEATURE_TAR_NOPRESERVE_TIME
 121 //config:       bool "Enable -m (do not preserve time) GNU option"
 122 //config:       default y
 123 //config:       depends on TAR
 124 //config:
 125 //config:config FEATURE_TAR_SELINUX
 126 //config:       bool "Support extracting SELinux labels"
 127 //config:       default n
 128 //config:       depends on TAR && SELINUX
 129 //config:       help
 130 //config:         With this option busybox supports restoring SELinux labels
 131 //config:         when extracting files from tar archives.
 132
 133 //applet:IF_TAR(APPLET(tar, BB_DIR_BIN, BB_SUID_DROP))
 134 //kbuild:lib-$(CONFIG_TAR) += tar.o
 135
 136 #include <fnmatch.h>
 137 #include "libbb.h"
 138 #include "common_bufsiz.h"
 139 #include "bb_archive.h"
 140 /* FIXME: Stop using this non-standard feature */
 141 #ifndef FNM_LEADING_DIR
 142 # define FNM_LEADING_DIR 0
 143 #endif
 144
 145 #if 0
 146 # define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
 147 #else
 148 # define DBG(...) ((void)0)
 149 #endif
 150 #define DBG_OPTION_PARSING 0
 151
 152
 153 #define block_buf bb_common_bufsiz1
 154 #define INIT_G() do { setup_common_bufsiz(); } while (0)
 155
 156
 157 #if ENABLE_FEATURE_TAR_CREATE
 158
 159 /*
 160 ** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
 161 ** the only functions that deal with the HardLinkInfo structure.
 162 ** Even these functions use the xxxHardLinkInfo() functions.
 163 */
 164 typedef struct HardLinkInfo {
 165         struct HardLinkInfo *next; /* Next entry in list */
 166         dev_t dev;                 /* Device number */
 167         ino_t ino;                 /* Inode number */
 168 //      short linkCount;           /* (Hard) Link Count */
 169         char name[1];              /* Start of filename (must be last) */
 170 } HardLinkInfo;
 171
 172 /* Some info to be carried along when creating a new tarball */
 173 typedef struct TarBallInfo {
 174         int tarFd;                      /* Open-for-write file descriptor
 175                                          * for the tarball */
 176         int verboseFlag;                /* Whether to print extra stuff or not */
 177         const llist_t *excludeList;     /* List of files to not include */
 178         HardLinkInfo *hlInfoHead;       /* Hard Link Tracking Information */
 179         HardLinkInfo *hlInfo;           /* Hard Link Info for the current file */
 180 //TODO: save only st_dev + st_ino
 181         struct stat tarFileStatBuf;     /* Stat info for the tarball, letting
 182                                          * us know the inode and device that the
 183                                          * tarball lives, so we can avoid trying
 184                                          * to include the tarball into itself */
 185 } TarBallInfo;
 186
 187 /* A nice enum with all the possible tar file content types */
 188 enum {
 189         REGTYPE = '0',          /* regular file */
 190         REGTYPE0 = '\0',        /* regular file (ancient bug compat) */
 191         LNKTYPE = '1',          /* hard link */
 192         SYMTYPE = '2',          /* symbolic link */
 193         CHRTYPE = '3',          /* character special */
 194         BLKTYPE = '4',          /* block special */
 195         DIRTYPE = '5',          /* directory */
 196         FIFOTYPE = '6',         /* FIFO special */
 197         CONTTYPE = '7',         /* reserved */
 198         GNULONGLINK = 'K',      /* GNU long (>100 chars) link name */
 199         GNULONGNAME = 'L',      /* GNU long (>100 chars) file name */
 200 };
 201
 202 /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
 203 static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr,
 204                                         struct stat *statbuf,
 205                                         const char *fileName)
 206 {
 207         /* Note: hlInfoHeadPtr can never be NULL! */
 208         HardLinkInfo *hlInfo;
 209
 210         hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName));
 211         hlInfo->next = *hlInfoHeadPtr;
 212         *hlInfoHeadPtr = hlInfo;
 213         hlInfo->dev = statbuf->st_dev;
 214         hlInfo->ino = statbuf->st_ino;
 215 //      hlInfo->linkCount = statbuf->st_nlink;
 216         strcpy(hlInfo->name, fileName);
 217 }
 218
 219 static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr)
 220 {
 221         HardLinkInfo *hlInfo;
 222         HardLinkInfo *hlInfoNext;
 223
 224         if (hlInfoHeadPtr) {
 225                 hlInfo = *hlInfoHeadPtr;
 226                 while (hlInfo) {
 227                         hlInfoNext = hlInfo->next;
 228                         free(hlInfo);
 229                         hlInfo = hlInfoNext;
 230                 }
 231                 *hlInfoHeadPtr = NULL;
 232         }
 233 }
 234
 235 /* Might be faster (and bigger) if the dev/ino were stored in numeric order ;) */
 236 static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf)
 237 {
 238         while (hlInfo) {
 239                 if (statbuf->st_ino == hlInfo->ino
 240                  && statbuf->st_dev == hlInfo->dev
 241                 ) {
 242                         DBG("found hardlink:'%s'", hlInfo->name);
 243                         break;
 244                 }
 245                 hlInfo = hlInfo->next;
 246         }
 247         return hlInfo;
 248 }
 249
 250 /* Put an octal string into the specified buffer.
 251  * The number is zero padded and possibly null terminated.
 252  * Stores low-order bits only if whole value does not fit. */
 253 static void putOctal(char *cp, int len, off_t value)
 254 {
 255         char tempBuffer[sizeof(off_t)*3 + 1];
 256         char *tempString = tempBuffer;
 257         int width;
 258
 259         width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value);
 260         tempString += (width - len);
 261
 262         /* If string has leading zeroes, we can drop one */
 263         /* and field will have trailing '\0' */
 264         /* (increases chances of compat with other tars) */
 265         if (tempString[0] == '0')
 266                 tempString++;
 267
 268         /* Copy the string to the field */
 269         memcpy(cp, tempString, len);
 270 }
 271 #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b))
 272
 273 static void chksum_and_xwrite(int fd, struct tar_header_t* hp)
 274 {
 275         /* POSIX says that checksum is done on unsigned bytes
 276          * (Sun and HP-UX gets it wrong... more details in
 277          * GNU tar source) */
 278         const unsigned char *cp;
 279         int chksum, size;
 280
 281         strcpy(hp->magic, "ustar  ");
 282
 283         /* Calculate and store the checksum (i.e., the sum of all of the bytes of
 284          * the header).  The checksum field must be filled with blanks for the
 285          * calculation.  The checksum field is formatted differently from the
 286          * other fields: it has 6 digits, a null, then a space -- rather than
 287          * digits, followed by a null like the other fields... */
 288         memset(hp->chksum, ' ', sizeof(hp->chksum));
 289         cp = (const unsigned char *) hp;
 290         chksum = 0;
 291         size = sizeof(*hp);
 292         do { chksum += *cp++; } while (--size);
 293         putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum);
 294
 295         /* Now write the header out to disk */
 296         xwrite(fd, hp, sizeof(*hp));
 297 }
 298
 299 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 300 static void writeLongname(int fd, int type, const char *name, int dir)
 301 {
 302         static const struct {
 303                 char mode[8];             /* 100-107 */
 304                 char uid[8];              /* 108-115 */
 305                 char gid[8];              /* 116-123 */
 306                 char size[12];            /* 124-135 */
 307                 char mtime[12];           /* 136-147 */
 308         } prefilled = {
 309                 "0000000",
 310                 "0000000",
 311                 "0000000",
 312                 "00000000000",
 313                 "00000000000",
 314         };
 315         struct tar_header_t header;
 316         int size;
 317
 318         dir = !!dir; /* normalize: 0/1 */
 319         size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */
 320         /* + dir: account for possible '/' */
 321
 322         memset(&header, 0, sizeof(header));
 323         strcpy(header.name, "././@LongLink");
 324         memcpy(header.mode, prefilled.mode, sizeof(prefilled));
 325         PUT_OCTAL(header.size, size);
 326         header.typeflag = type;
 327         chksum_and_xwrite(fd, &header);
 328
 329         /* Write filename[/] and pad the block. */
 330         /* dir=0: writes 'name<NUL>', pads */
 331         /* dir=1: writes 'name', writes '/<NUL>', pads */
 332         dir *= 2;
 333         xwrite(fd, name, size - dir);
 334         xwrite(fd, "/", dir);
 335         size = (-size) & (TAR_BLOCK_SIZE-1);
 336         memset(&header, 0, size);
 337         xwrite(fd, &header, size);
 338 }
 339 #endif
 340
 341 /* Write out a tar header for the specified file/directory/whatever */
 342 static int writeTarHeader(struct TarBallInfo *tbInfo,
 343                 const char *header_name, const char *fileName, struct stat *statbuf)
 344 {
 345         struct tar_header_t header;
 346
 347         memset(&header, 0, sizeof(header));
 348
 349         strncpy(header.name, header_name, sizeof(header.name));
 350
 351         /* POSIX says to mask mode with 07777. */
 352         PUT_OCTAL(header.mode, statbuf->st_mode & 07777);
 353         PUT_OCTAL(header.uid, statbuf->st_uid);
 354         PUT_OCTAL(header.gid, statbuf->st_gid);
 355         memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */
 356         /* users report that files with negative st_mtime cause trouble, so: */
 357         PUT_OCTAL(header.mtime, statbuf->st_mtime >= 0 ? statbuf->st_mtime : 0);
 358
 359         /* Enter the user and group names */
 360         safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname));
 361         safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname));
 362
 363         if (tbInfo->hlInfo) {
 364                 /* This is a hard link */
 365                 header.typeflag = LNKTYPE;
 366                 strncpy(header.linkname, tbInfo->hlInfo->name,
 367                                 sizeof(header.linkname));
 368 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 369                 /* Write out long linkname if needed */
 370                 if (header.linkname[sizeof(header.linkname)-1])
 371                         writeLongname(tbInfo->tarFd, GNULONGLINK,
 372                                         tbInfo->hlInfo->name, 0);
 373 #endif
 374         } else if (S_ISLNK(statbuf->st_mode)) {
 375                 char *lpath = xmalloc_readlink_or_warn(fileName);
 376                 if (!lpath)
 377                         return FALSE;
 378                 header.typeflag = SYMTYPE;
 379                 strncpy(header.linkname, lpath, sizeof(header.linkname));
 380 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 381                 /* Write out long linkname if needed */
 382                 if (header.linkname[sizeof(header.linkname)-1])
 383                         writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0);
 384 #else
 385                 /* If it is larger than 100 bytes, bail out */
 386                 if (header.linkname[sizeof(header.linkname)-1]) {
 387                         free(lpath);
 388                         bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
 389                         return FALSE;
 390                 }
 391 #endif
 392                 free(lpath);
 393         } else if (S_ISDIR(statbuf->st_mode)) {
 394                 header.typeflag = DIRTYPE;
 395                 /* Append '/' only if there is a space for it */
 396                 if (!header.name[sizeof(header.name)-1])
 397                         header.name[strlen(header.name)] = '/';
 398         } else if (S_ISCHR(statbuf->st_mode)) {
 399                 header.typeflag = CHRTYPE;
 400                 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
 401                 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
 402         } else if (S_ISBLK(statbuf->st_mode)) {
 403                 header.typeflag = BLKTYPE;
 404                 PUT_OCTAL(header.devmajor, major(statbuf->st_rdev));
 405                 PUT_OCTAL(header.devminor, minor(statbuf->st_rdev));
 406         } else if (S_ISFIFO(statbuf->st_mode)) {
 407                 header.typeflag = FIFOTYPE;
 408         } else if (S_ISREG(statbuf->st_mode)) {
 409                 /* header.size field is 12 bytes long */
 410                 /* Does octal-encoded size fit? */
 411                 uoff_t filesize = statbuf->st_size;
 412                 if (sizeof(filesize) <= 4
 413                  || filesize <= (uoff_t)0777777777777LL
 414                 ) {
 415                         PUT_OCTAL(header.size, filesize);
 416                 }
 417                 /* Does base256-encoded size fit?
 418                  * It always does unless off_t is wider than 64 bits.
 419                  */
 420                 else if (ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 421 #if ULLONG_MAX > 0xffffffffffffffffLL /* 2^64-1 */
 422                  && (filesize <= 0x3fffffffffffffffffffffffLL)
 423 #endif
 424                 ) {
 425                         /* GNU tar uses "base-256 encoding" for very large numbers.
 426                          * Encoding is binary, with highest bit always set as a marker
 427                          * and sign in next-highest bit:
 428                          * 80 00 .. 00 - zero
 429                          * bf ff .. ff - largest positive number
 430                          * ff ff .. ff - minus 1
 431                          * c0 00 .. 00 - smallest negative number
 432                          */
 433                         char *p8 = header.size + sizeof(header.size);
 434                         do {
 435                                 *--p8 = (uint8_t)filesize;
 436                                 filesize >>= 8;
 437                         } while (p8 != header.size);
 438                         *p8 |= 0x80;
 439                 } else {
 440                         bb_error_msg_and_die("can't store file '%s' "
 441                                 "of size %"OFF_FMT"u, aborting",
 442                                 fileName, statbuf->st_size);
 443                 }
 444                 header.typeflag = REGTYPE;
 445         } else {
 446                 bb_error_msg("%s: unknown file type", fileName);
 447                 return FALSE;
 448         }
 449
 450 #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 451         /* Write out long name if needed */
 452         /* (we, like GNU tar, output long linkname *before* long name) */
 453         if (header.name[sizeof(header.name)-1])
 454                 writeLongname(tbInfo->tarFd, GNULONGNAME,
 455                                 header_name, S_ISDIR(statbuf->st_mode));
 456 #endif
 457
 458         /* Now write the header out to disk */
 459         chksum_and_xwrite(tbInfo->tarFd, &header);
 460
 461         /* Now do the verbose thing (or not) */
 462         if (tbInfo->verboseFlag) {
 463                 FILE *vbFd = stdout;
 464
 465                 /* If archive goes to stdout, verbose goes to stderr */
 466                 if (tbInfo->tarFd == STDOUT_FILENO)
 467                         vbFd = stderr;
 468                 /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */
 469                 /* We don't have such excesses here: for us "v" == "vv" */
 470                 /* '/' is probably a GNUism */
 471                 fprintf(vbFd, "%s%s\n", header_name,
 472                                 S_ISDIR(statbuf->st_mode) ? "/" : "");
 473         }
 474
 475         return TRUE;
 476 }
 477
 478 #if ENABLE_FEATURE_TAR_FROM
 479 static int exclude_file(const llist_t *excluded_files, const char *file)
 480 {
 481         while (excluded_files) {
 482                 if (excluded_files->data[0] == '/') {
 483                         if (fnmatch(excluded_files->data, file,
 484                                         FNM_PATHNAME | FNM_LEADING_DIR) == 0)
 485                                 return 1;
 486                 } else {
 487                         const char *p;
 488
 489                         for (p = file; p[0] != '\0'; p++) {
 490                                 if ((p == file || p[-1] == '/')
 491                                  && p[0] != '/'
 492                                  && fnmatch(excluded_files->data, p,
 493                                                 FNM_PATHNAME | FNM_LEADING_DIR) == 0
 494                                 ) {
 495                                         return 1;
 496                                 }
 497                         }
 498                 }
 499                 excluded_files = excluded_files->link;
 500         }
 501
 502         return 0;
 503 }
 504 #else
 505 # define exclude_file(excluded_files, file) 0
 506 #endif
 507
 508 static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf,
 509                         void *userData, int depth UNUSED_PARAM)
 510 {
 511         struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData;
 512         const char *header_name;
 513         int inputFileFd = -1;
 514
 515         DBG("writeFileToTarball('%s')", fileName);
 516
 517         /* Strip leading '/' and such (must be before memorizing hardlink's name) */
 518         header_name = strip_unsafe_prefix(fileName);
 519
 520         if (header_name[0] == '\0')
 521                 return TRUE;
 522
 523         /* It is against the rules to archive a socket */
 524         if (S_ISSOCK(statbuf->st_mode)) {
 525                 bb_error_msg("%s: socket ignored", fileName);
 526                 return TRUE;
 527         }
 528
 529         /*
 530          * Check to see if we are dealing with a hard link.
 531          * If so -
 532          * Treat the first occurrence of a given dev/inode as a file while
 533          * treating any additional occurrences as hard links.  This is done
 534          * by adding the file information to the HardLinkInfo linked list.
 535          */
 536         tbInfo->hlInfo = NULL;
 537         if (!S_ISDIR(statbuf->st_mode) && statbuf->st_nlink > 1) {
 538                 DBG("'%s': st_nlink > 1", header_name);
 539                 tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf);
 540                 if (tbInfo->hlInfo == NULL) {
 541                         DBG("'%s': addHardLinkInfo", header_name);
 542                         addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name);
 543                 }
 544         }
 545
 546         /* It is a bad idea to store the archive we are in the process of creating,
 547          * so check the device and inode to be sure that this particular file isn't
 548          * the new tarball */
 549         if (tbInfo->tarFileStatBuf.st_dev == statbuf->st_dev
 550          && tbInfo->tarFileStatBuf.st_ino == statbuf->st_ino
 551         ) {
 552                 bb_error_msg("%s: file is the archive; skipping", fileName);
 553                 return TRUE;
 554         }
 555
 556         if (exclude_file(tbInfo->excludeList, header_name))
 557                 return SKIP;
 558
 559 #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS
 560         if (strlen(header_name) >= NAME_SIZE) {
 561                 bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported");
 562                 return TRUE;
 563         }
 564 #endif
 565
 566         /* Is this a regular file? */
 567         if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) {
 568                 /* open the file we want to archive, and make sure all is well */
 569                 inputFileFd = open_or_warn(fileName, O_RDONLY);
 570                 if (inputFileFd < 0) {
 571                         return FALSE;
 572                 }
 573         }
 574
 575         /* Add an entry to the tarball */
 576         if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) {
 577                 return FALSE;
 578         }
 579
 580         /* If it was a regular file, write out the body */
 581         if (inputFileFd >= 0) {
 582                 size_t readSize;
 583                 /* Write the file to the archive. */
 584                 /* We record size into header first, */
 585                 /* and then write out file. If file shrinks in between, */
 586                 /* tar will be corrupted. So we don't allow for that. */
 587                 /* NB: GNU tar 1.16 warns and pads with zeroes */
 588                 /* or even seeks back and updates header */
 589                 bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
 590                 ////off_t readSize;
 591                 ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size);
 592                 ////if (readSize != statbuf->st_size && readSize >= 0) {
 593                 ////    bb_error_msg_and_die("short read from %s, aborting", fileName);
 594                 ////}
 595
 596                 /* Check that file did not grow in between? */
 597                 /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */
 598
 599                 close(inputFileFd);
 600
 601                 /* Pad the file up to the tar block size */
 602                 /* (a few tricks here in the name of code size) */
 603                 readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1);
 604                 memset(block_buf, 0, readSize);
 605                 xwrite(tbInfo->tarFd, block_buf, readSize);
 606         }
 607
 608         return TRUE;
 609 }
 610
 611 #if SEAMLESS_COMPRESSION
 612 /* Don't inline: vfork scares gcc and pessimizes code */
 613 static void NOINLINE vfork_compressor(int tar_fd, const char *gzip)
 614 {
 615         pid_t gzipPid;
 616
 617         // On Linux, vfork never unpauses parent early, although standard
 618         // allows for that. Do we want to waste bytes checking for it?
 619 # define WAIT_FOR_CHILD 0
 620         volatile int vfork_exec_errno = 0;
 621         struct fd_pair gzipDataPipe;
 622 # if WAIT_FOR_CHILD
 623         struct fd_pair gzipStatusPipe;
 624         xpiped_pair(gzipStatusPipe);
 625 # endif
 626         xpiped_pair(gzipDataPipe);
 627
 628         signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */
 629
 630         gzipPid = xvfork();
 631
 632         if (gzipPid == 0) {
 633                 /* child */
 634                 /* NB: close _first_, then move fds! */
 635                 close(gzipDataPipe.wr);
 636 # if WAIT_FOR_CHILD
 637                 close(gzipStatusPipe.rd);
 638                 /* gzipStatusPipe.wr will close only on exec -
 639                  * parent waits for this close to happen */
 640                 fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC);
 641 # endif
 642                 xmove_fd(gzipDataPipe.rd, 0);
 643                 xmove_fd(tar_fd, 1);
 644                 /* exec gzip/bzip2 program/applet */
 645                 BB_EXECLP(gzip, gzip, "-f", (char *)0);
 646                 vfork_exec_errno = errno;
 647                 _exit(EXIT_FAILURE);
 648         }
 649
 650         /* parent */
 651         xmove_fd(gzipDataPipe.wr, tar_fd);
 652         close(gzipDataPipe.rd);
 653 # if WAIT_FOR_CHILD
 654         close(gzipStatusPipe.wr);
 655         while (1) {
 656                 char buf;
 657                 int n;
 658
 659                 /* Wait until child execs (or fails to) */
 660                 n = full_read(gzipStatusPipe.rd, &buf, 1);
 661                 if (n < 0 /* && errno == EAGAIN */)
 662                         continue;       /* try it again */
 663         }
 664         close(gzipStatusPipe.rd);
 665 # endif
 666         if (vfork_exec_errno) {
 667                 errno = vfork_exec_errno;
 668                 bb_perror_msg_and_die("can't execute '%s'", gzip);
 669         }
 670 }
 671 #endif /* SEAMLESS_COMPRESSION */
 672
 673
 674 #if !SEAMLESS_COMPRESSION
 675 /* Do not pass gzip flag to writeTarFile() */
 676 #define writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude, gzip) \
 677         writeTarFile(tar_fd, verboseFlag, recurseFlags, include, exclude)
 678 #endif
 679 /* gcc 4.2.1 inlines it, making code bigger */
 680 static NOINLINE int writeTarFile(int tar_fd, int verboseFlag,
 681         int recurseFlags, const llist_t *include,
 682         const llist_t *exclude, const char *gzip)
 683 {
 684         int errorFlag = FALSE;
 685         struct TarBallInfo tbInfo;
 686
 687         tbInfo.hlInfoHead = NULL;
 688         tbInfo.tarFd = tar_fd;
 689         tbInfo.verboseFlag = verboseFlag;
 690
 691         /* Store the stat info for the tarball's file, so
 692          * can avoid including the tarball into itself....  */
 693         xfstat(tbInfo.tarFd, &tbInfo.tarFileStatBuf, "can't stat tar file");
 694
 695 #if SEAMLESS_COMPRESSION
 696         if (gzip)
 697                 vfork_compressor(tbInfo.tarFd, gzip);
 698 #endif
 699
 700         tbInfo.excludeList = exclude;
 701
 702         /* Read the directory/files and iterate over them one at a time */
 703         while (include) {
 704                 if (!recursive_action(include->data, recurseFlags,
 705                                 writeFileToTarball, writeFileToTarball, &tbInfo, 0)
 706                 ) {
 707                         errorFlag = TRUE;
 708                 }
 709                 include = include->link;
 710         }
 711         /* Write two empty blocks to the end of the archive */
 712         memset(block_buf, 0, 2*TAR_BLOCK_SIZE);
 713         xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE);
 714
 715         /* To be pedantically correct, we would check if the tarball
 716          * is smaller than 20 tar blocks, and pad it if it was smaller,
 717          * but that isn't necessary for GNU tar interoperability, and
 718          * so is considered a waste of space */
 719
 720         /* Close so the child process (if any) will exit */
 721         close(tbInfo.tarFd);
 722
 723         /* Hang up the tools, close up shop, head home */
 724         if (ENABLE_FEATURE_CLEAN_UP)
 725                 freeHardLinkInfo(&tbInfo.hlInfoHead);
 726
 727         if (errorFlag)
 728                 bb_error_msg("error exit delayed from previous errors");
 729
 730 #if SEAMLESS_COMPRESSION
 731         if (gzip) {
 732                 int status;
 733                 if (safe_waitpid(-1, &status, 0) == -1)
 734                         bb_perror_msg("waitpid");
 735                 else if (!WIFEXITED(status) || WEXITSTATUS(status))
 736                         /* gzip was killed or has exited with nonzero! */
 737                         errorFlag = TRUE;
 738         }
 739 #endif
 740         return errorFlag;
 741 }
 742 #else /* !FEATURE_TAR_CREATE */
 743 # define writeTarFile(...) 0
 744 #endif
 745
 746 #if ENABLE_FEATURE_TAR_FROM
 747 static llist_t *append_file_list_to_list(llist_t *list)
 748 {
 749         FILE *src_stream;
 750         char *line;
 751         llist_t *newlist = NULL;
 752
 753         while (list) {
 754                 src_stream = xfopen_stdin(llist_pop(&list));
 755                 while ((line = xmalloc_fgetline(src_stream)) != NULL) {
 756                         /* kill trailing '/' unless the string is just "/" */
 757                         char *cp = last_char_is(line, '/');
 758                         if (cp > line)
 759                                 *cp = '\0';
 760                         llist_add_to_end(&newlist, line);
 761                 }
 762                 fclose(src_stream);
 763         }
 764         return newlist;
 765 }
 766 #endif
 767
 768 //usage:#define tar_trivial_usage
 769 //usage:        "-[" IF_FEATURE_TAR_CREATE("c") "xt"
 770 //usage:        IF_FEATURE_SEAMLESS_Z("Z")
 771 //usage:        IF_FEATURE_SEAMLESS_GZ("z")
 772 //usage:        IF_FEATURE_SEAMLESS_XZ("J")
 773 //usage:        IF_FEATURE_SEAMLESS_BZ2("j")
 774 //usage:        IF_FEATURE_SEAMLESS_LZMA("a")
 775 //usage:        IF_FEATURE_TAR_CREATE("h")
 776 //usage:        IF_FEATURE_TAR_NOPRESERVE_TIME("m")
 777 //usage:        "vO] "
 778 //usage:        IF_FEATURE_TAR_FROM("[-X FILE] [-T FILE] ")
 779 //usage:        "[-f TARFILE] [-C DIR] [FILE]..."
 780 //usage:#define tar_full_usage "\n\n"
 781 //usage:        IF_FEATURE_TAR_CREATE("Create, extract, ")
 782 //usage:        IF_NOT_FEATURE_TAR_CREATE("Extract ")
 783 //usage:        "or list files from a tar file\n"
 784 //usage:     "\nOperation:"
 785 //usage:        IF_FEATURE_TAR_CREATE(
 786 //usage:     "\n        c       Create"
 787 //usage:        )
 788 //usage:     "\n        x       Extract"
 789 //usage:     "\n        t       List"
 790 //usage:     "\n        f       Name of TARFILE ('-' for stdin/out)"
 791 //usage:     "\n        C       Change to DIR before operation"
 792 //usage:     "\n        v       Verbose"
 793 //usage:        IF_FEATURE_SEAMLESS_Z(
 794 //usage:     "\n        Z       (De)compress using compress"
 795 //usage:        )
 796 //usage:        IF_FEATURE_SEAMLESS_GZ(
 797 //usage:     "\n        z       (De)compress using gzip"
 798 //usage:        )
 799 //usage:        IF_FEATURE_SEAMLESS_XZ(
 800 //usage:     "\n        J       (De)compress using xz"
 801 //usage:        )
 802 //usage:        IF_FEATURE_SEAMLESS_BZ2(
 803 //usage:     "\n        j       (De)compress using bzip2"
 804 //usage:        )
 805 //usage:        IF_FEATURE_SEAMLESS_LZMA(
 806 //usage:     "\n        a       (De)compress using lzma"
 807 //usage:        )
 808 //usage:     "\n        O       Extract to stdout"
 809 //usage:        IF_FEATURE_TAR_CREATE(
 810 //usage:     "\n        h       Follow symlinks"
 811 //usage:        )
 812 //usage:        IF_FEATURE_TAR_NOPRESERVE_TIME(
 813 //usage:     "\n        m       Don't restore mtime"
 814 //usage:        )
 815 //usage:        IF_FEATURE_TAR_FROM(
 816 //usage:        IF_FEATURE_TAR_LONG_OPTIONS(
 817 //usage:     "\n        exclude File to exclude"
 818 //usage:        )
 819 //usage:     "\n        X       File with names to exclude"
 820 //usage:     "\n        T       File with names to include"
 821 //usage:        )
 822 //usage:
 823 //usage:#define tar_example_usage
 824 //usage:       "$ zcat /tmp/tarball.tar.gz | tar -xf -\n"
 825 //usage:       "$ tar -cf /tmp/tarball.tar /usr/local\n"
 826
 827 // Supported but aren't in --help:
 828 //      o       no-same-owner
 829 //      p       same-permissions
 830 //      k       keep-old
 831 //      no-recursion
 832 //      numeric-owner
 833 //      no-same-permissions
 834 //      overwrite
 835 //IF_FEATURE_TAR_TO_COMMAND(
 836 //      to-command
 837 //)
 838
 839 enum {
 840         OPTBIT_KEEP_OLD = 8,
 841         IF_FEATURE_TAR_CREATE(   OPTBIT_CREATE      ,)
 842         IF_FEATURE_TAR_CREATE(   OPTBIT_DEREFERENCE ,)
 843         IF_FEATURE_SEAMLESS_BZ2( OPTBIT_BZIP2       ,)
 844         IF_FEATURE_SEAMLESS_LZMA(OPTBIT_LZMA        ,)
 845         IF_FEATURE_TAR_FROM(     OPTBIT_INCLUDE_FROM,)
 846         IF_FEATURE_TAR_FROM(     OPTBIT_EXCLUDE_FROM,)
 847         IF_FEATURE_SEAMLESS_GZ(  OPTBIT_GZIP        ,)
 848         IF_FEATURE_SEAMLESS_XZ(  OPTBIT_XZ          ,) // 16th bit
 849         IF_FEATURE_SEAMLESS_Z(   OPTBIT_COMPRESS    ,)
 850         IF_FEATURE_TAR_NOPRESERVE_TIME(OPTBIT_NOPRESERVE_TIME,)
 851 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 852         OPTBIT_STRIP_COMPONENTS,
 853         OPTBIT_NORECURSION,
 854         IF_FEATURE_TAR_TO_COMMAND(OPTBIT_2COMMAND   ,)
 855         OPTBIT_NUMERIC_OWNER,
 856         OPTBIT_NOPRESERVE_PERM,
 857         OPTBIT_OVERWRITE,
 858 #endif
 859         OPT_TEST         = 1 << 0, // t
 860         OPT_EXTRACT      = 1 << 1, // x
 861         OPT_BASEDIR      = 1 << 2, // C
 862         OPT_TARNAME      = 1 << 3, // f
 863         OPT_2STDOUT      = 1 << 4, // O
 864         OPT_NOPRESERVE_OWNER = 1 << 5, // o == no-same-owner
 865         OPT_P            = 1 << 6, // p
 866         OPT_VERBOSE      = 1 << 7, // v
 867         OPT_KEEP_OLD     = 1 << 8, // k
 868         OPT_CREATE       = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_CREATE      )) + 0, // c
 869         OPT_DEREFERENCE  = IF_FEATURE_TAR_CREATE(   (1 << OPTBIT_DEREFERENCE )) + 0, // h
 870         OPT_BZIP2        = IF_FEATURE_SEAMLESS_BZ2( (1 << OPTBIT_BZIP2       )) + 0, // j
 871         OPT_LZMA         = IF_FEATURE_SEAMLESS_LZMA((1 << OPTBIT_LZMA        )) + 0, // a
 872         OPT_INCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_INCLUDE_FROM)) + 0, // T
 873         OPT_EXCLUDE_FROM = IF_FEATURE_TAR_FROM(     (1 << OPTBIT_EXCLUDE_FROM)) + 0, // X
 874         OPT_GZIP         = IF_FEATURE_SEAMLESS_GZ(  (1 << OPTBIT_GZIP        )) + 0, // z
 875         OPT_XZ           = IF_FEATURE_SEAMLESS_XZ(  (1 << OPTBIT_XZ          )) + 0, // J
 876         OPT_COMPRESS     = IF_FEATURE_SEAMLESS_Z(   (1 << OPTBIT_COMPRESS    )) + 0, // Z
 877         OPT_NOPRESERVE_TIME  = IF_FEATURE_TAR_NOPRESERVE_TIME((1 << OPTBIT_NOPRESERVE_TIME)) + 0, // m
 878         OPT_STRIP_COMPONENTS = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_STRIP_COMPONENTS)) + 0, // strip-components
 879         OPT_NORECURSION      = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NORECURSION    )) + 0, // no-recursion
 880         OPT_2COMMAND         = IF_FEATURE_TAR_TO_COMMAND(  (1 << OPTBIT_2COMMAND       )) + 0, // to-command
 881         OPT_NUMERIC_OWNER    = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NUMERIC_OWNER  )) + 0, // numeric-owner
 882         OPT_NOPRESERVE_PERM  = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_NOPRESERVE_PERM)) + 0, // no-same-permissions
 883         OPT_OVERWRITE        = IF_FEATURE_TAR_LONG_OPTIONS((1 << OPTBIT_OVERWRITE      )) + 0, // overwrite
 884
 885         OPT_ANY_COMPRESS = (OPT_BZIP2 | OPT_LZMA | OPT_GZIP | OPT_XZ | OPT_COMPRESS),
 886 };
 887 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 888 static const char tar_longopts[] ALIGN1 =
 889         "list\0"                No_argument       "t"
 890         "extract\0"             No_argument       "x"
 891         "directory\0"           Required_argument "C"
 892         "file\0"                Required_argument "f"
 893         "to-stdout\0"           No_argument       "O"
 894         /* do not restore owner */
 895         /* Note: GNU tar handles 'o' as no-same-owner only on extract,
 896          * on create, 'o' is --old-archive. We do not support --old-archive. */
 897         "no-same-owner\0"       No_argument       "o"
 898         "same-permissions\0"    No_argument       "p"
 899         "verbose\0"             No_argument       "v"
 900         "keep-old\0"            No_argument       "k"
 901 # if ENABLE_FEATURE_TAR_CREATE
 902         "create\0"              No_argument       "c"
 903         "dereference\0"         No_argument       "h"
 904 # endif
 905 # if ENABLE_FEATURE_SEAMLESS_BZ2
 906         "bzip2\0"               No_argument       "j"
 907 # endif
 908 # if ENABLE_FEATURE_SEAMLESS_LZMA
 909         "lzma\0"                No_argument       "a"
 910 # endif
 911 # if ENABLE_FEATURE_TAR_FROM
 912         "files-from\0"          Required_argument "T"
 913         "exclude-from\0"        Required_argument "X"
 914 # endif
 915 # if ENABLE_FEATURE_SEAMLESS_GZ
 916         "gzip\0"                No_argument       "z"
 917 # endif
 918 # if ENABLE_FEATURE_SEAMLESS_XZ
 919         "xz\0"                  No_argument       "J"
 920 # endif
 921 # if ENABLE_FEATURE_SEAMLESS_Z
 922         "compress\0"            No_argument       "Z"
 923 # endif
 924 # if ENABLE_FEATURE_TAR_NOPRESERVE_TIME
 925         "touch\0"               No_argument       "m"
 926 # endif
 927         "strip-components\0"    Required_argument "\xf9"
 928         "no-recursion\0"        No_argument       "\xfa"
 929 # if ENABLE_FEATURE_TAR_TO_COMMAND
 930         "to-command\0"          Required_argument "\xfb"
 931 # endif
 932         /* use numeric uid/gid from tar header, not textual */
 933         "numeric-owner\0"       No_argument       "\xfc"
 934         /* do not restore mode */
 935         "no-same-permissions\0" No_argument       "\xfd"
 936         /* on unpack, open with O_TRUNC and !O_EXCL */
 937         "overwrite\0"           No_argument       "\xfe"
 938         /* --exclude takes next bit position in option mask, */
 939         /* therefore we have to put it _after_ --no-same-permissions */
 940 # if ENABLE_FEATURE_TAR_FROM
 941         "exclude\0"             Required_argument "\xff"
 942 # endif
 943         ;
 944 #endif
 945
 946 int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 947 int tar_main(int argc UNUSED_PARAM, char **argv)
 948 {
 949         archive_handle_t *tar_handle;
 950         char *base_dir = NULL;
 951         const char *tar_filename = "-";
 952         unsigned opt;
 953         int verboseFlag = 0;
 954 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
 955         llist_t *excludes = NULL;
 956 #endif
 957         INIT_G();
 958
 959         /* Initialise default values */
 960         tar_handle = init_handle();
 961         tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS
 962                              | ARCHIVE_RESTORE_DATE
 963                              | ARCHIVE_UNLINK_OLD;
 964
 965         /* Apparently only root's tar preserves perms (see bug 3844) */
 966         if (getuid() != 0)
 967                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
 968
 969         /* Prepend '-' to the first argument if required */
 970         opt_complementary = "--:" // first arg is options
 971                 "tt:vv:" // count -t,-v
 972 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
 973                 "\xff::" // --exclude=PATTERN is a list
 974 #endif
 975                 IF_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd
 976                 IF_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive
 977                 IF_NOT_FEATURE_TAR_CREATE("t--x:x--t") // mutually exclusive
 978 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 979                 ":\xf9+" // --strip-components=NUM
 980 #endif
 981         ;
 982 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
 983         applet_long_options = tar_longopts;
 984 #endif
 985 #if ENABLE_DESKTOP
 986         /* Lie to buildroot when it starts asking stupid questions. */
 987         if (argv[1] && strcmp(argv[1], "--version") == 0) {
 988                 // Output of 'tar --version' examples:
 989                 // tar (GNU tar) 1.15.1
 990                 // tar (GNU tar) 1.25
 991                 // bsdtar 2.8.3 - libarchive 2.8.3
 992                 puts("tar (busybox) " BB_VER);
 993                 return 0;
 994         }
 995         if (argv[1] && argv[1][0] != '-') {
 996                 /* Compat:
 997                  * 1st argument without dash handles options with parameters
 998                  * differently from dashed one: it takes *next argv[i]*
 999                  * as paramenter even if there are more chars in 1st argument:
1000                  *  "tar fx TARFILE" - "x" is not taken as f's param
1001                  *  but is interpreted as -x option
1002                  *  "tar -xf TARFILE" - dashed equivalent of the above
1003                  *  "tar -fx ..." - "x" is taken as f's param
1004                  * getopt32 wouldn't handle 1st command correctly.
1005                  * Unfortunately, people do use such commands.
1006                  * We massage argv[1] to work around it by moving 'f'
1007                  * to the end of the string.
1008                  * More contrived "tar fCx TARFILE DIR" still fails,
1009                  * but such commands are much less likely to be used.
1010                  */
1011                 char *f = strchr(argv[1], 'f');
1012                 if (f) {
1013                         while (f[1] != '\0') {
1014                                 *f = f[1];
1015                                 f++;
1016                         }
1017                         *f = 'f';
1018                 }
1019         }
1020 #endif
1021         opt = getopt32(argv,
1022                 "txC:f:Oopvk"
1023                 IF_FEATURE_TAR_CREATE(   "ch"    )
1024                 IF_FEATURE_SEAMLESS_BZ2( "j"     )
1025                 IF_FEATURE_SEAMLESS_LZMA("a"     )
1026                 IF_FEATURE_TAR_FROM(     "T:*X:*")
1027                 IF_FEATURE_SEAMLESS_GZ(  "z"     )
1028                 IF_FEATURE_SEAMLESS_XZ(  "J"     )
1029                 IF_FEATURE_SEAMLESS_Z(   "Z"     )
1030                 IF_FEATURE_TAR_NOPRESERVE_TIME("m")
1031                 IF_FEATURE_TAR_LONG_OPTIONS("\xf9:") // --strip-components
1032                 , &base_dir // -C dir
1033                 , &tar_filename // -f filename
1034                 IF_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T
1035                 IF_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X
1036 #if ENABLE_FEATURE_TAR_LONG_OPTIONS
1037                 , &tar_handle->tar__strip_components // --strip-components
1038 #endif
1039                 IF_FEATURE_TAR_TO_COMMAND(, &(tar_handle->tar__to_command)) // --to-command
1040 #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM
1041                 , &excludes // --exclude
1042 #endif
1043                 , &verboseFlag // combined count for -t and -v
1044                 , &verboseFlag // combined count for -t and -v
1045                 );
1046 #if DBG_OPTION_PARSING
1047         bb_error_msg("opt: 0x%08x", opt);
1048 # define showopt(o) bb_error_msg("opt & %s(%x): %x", #o, o, opt & o);
1049         showopt(OPT_TEST            );
1050         showopt(OPT_EXTRACT         );
1051         showopt(OPT_BASEDIR         );
1052         showopt(OPT_TARNAME         );
1053         showopt(OPT_2STDOUT         );
1054         showopt(OPT_NOPRESERVE_OWNER);
1055         showopt(OPT_P               );
1056         showopt(OPT_VERBOSE         );
1057         showopt(OPT_KEEP_OLD        );
1058         showopt(OPT_CREATE          );
1059         showopt(OPT_DEREFERENCE     );
1060         showopt(OPT_BZIP2           );
1061         showopt(OPT_LZMA            );
1062         showopt(OPT_INCLUDE_FROM    );
1063         showopt(OPT_EXCLUDE_FROM    );
1064         showopt(OPT_GZIP            );
1065         showopt(OPT_XZ              );
1066         showopt(OPT_COMPRESS        );
1067         showopt(OPT_NOPRESERVE_TIME );
1068         showopt(OPT_STRIP_COMPONENTS);
1069         showopt(OPT_NORECURSION     );
1070         showopt(OPT_2COMMAND        );
1071         showopt(OPT_NUMERIC_OWNER   );
1072         showopt(OPT_NOPRESERVE_PERM );
1073         showopt(OPT_OVERWRITE       );
1074         showopt(OPT_ANY_COMPRESS    );
1075         bb_error_msg("base_dir:'%s'", base_dir);
1076         bb_error_msg("tar_filename:'%s'", tar_filename);
1077         bb_error_msg("verboseFlag:%d", verboseFlag);
1078         bb_error_msg("tar_handle->tar__to_command:'%s'", tar_handle->tar__to_command);
1079         bb_error_msg("tar_handle->tar__strip_components:%u", tar_handle->tar__strip_components);
1080         return 0;
1081 # undef showopt
1082 #endif
1083         argv += optind;
1084
1085         if (verboseFlag)
1086                 tar_handle->action_header = header_verbose_list;
1087         if (verboseFlag == 1)
1088                 tar_handle->action_header = header_list;
1089
1090         if (opt & OPT_EXTRACT)
1091                 tar_handle->action_data = data_extract_all;
1092
1093         if (opt & OPT_2STDOUT)
1094                 tar_handle->action_data = data_extract_to_stdout;
1095
1096         if (opt & OPT_2COMMAND) {
1097                 putenv((char*)"TAR_FILETYPE=f");
1098                 signal(SIGPIPE, SIG_IGN);
1099                 tar_handle->action_data = data_extract_to_command;
1100                 IF_FEATURE_TAR_TO_COMMAND(tar_handle->tar__to_command_shell = xstrdup(get_shell_name());)
1101         }
1102
1103         if (opt & OPT_KEEP_OLD)
1104                 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1105
1106         if (opt & OPT_NUMERIC_OWNER)
1107                 tar_handle->ah_flags |= ARCHIVE_NUMERIC_OWNER;
1108
1109         if (opt & OPT_NOPRESERVE_OWNER)
1110                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_OWNER;
1111
1112         if (opt & OPT_NOPRESERVE_PERM)
1113                 tar_handle->ah_flags |= ARCHIVE_DONT_RESTORE_PERM;
1114
1115         if (opt & OPT_OVERWRITE) {
1116                 tar_handle->ah_flags &= ~ARCHIVE_UNLINK_OLD;
1117                 tar_handle->ah_flags |= ARCHIVE_O_TRUNC;
1118         }
1119
1120         if (opt & OPT_NOPRESERVE_TIME)
1121                 tar_handle->ah_flags &= ~ARCHIVE_RESTORE_DATE;
1122
1123 #if ENABLE_FEATURE_TAR_FROM
1124         tar_handle->reject = append_file_list_to_list(tar_handle->reject);
1125 # if ENABLE_FEATURE_TAR_LONG_OPTIONS
1126         /* Append excludes to reject */
1127         while (excludes) {
1128                 llist_t *next = excludes->link;
1129                 excludes->link = tar_handle->reject;
1130                 tar_handle->reject = excludes;
1131                 excludes = next;
1132         }
1133 # endif
1134         tar_handle->accept = append_file_list_to_list(tar_handle->accept);
1135 #endif
1136
1137         /* Setup an array of filenames to work with */
1138         /* TODO: This is the same as in ar, make a separate function? */
1139         while (*argv) {
1140                 /* kill trailing '/' unless the string is just "/" */
1141                 char *cp = last_char_is(*argv, '/');
1142                 if (cp > *argv)
1143                         *cp = '\0';
1144                 llist_add_to_end(&tar_handle->accept, *argv);
1145                 argv++;
1146         }
1147
1148         if (tar_handle->accept || tar_handle->reject)
1149                 tar_handle->filter = filter_accept_reject_list;
1150
1151         /* Open the tar file */
1152         {
1153                 int tar_fd = STDIN_FILENO;
1154                 int flags = O_RDONLY;
1155
1156                 if (opt & OPT_CREATE) {
1157                         /* Make sure there is at least one file to tar up */
1158                         if (tar_handle->accept == NULL)
1159                                 bb_error_msg_and_die("empty archive");
1160
1161                         tar_fd = STDOUT_FILENO;
1162                         /* Mimicking GNU tar 1.15.1: */
1163                         flags = O_WRONLY | O_CREAT | O_TRUNC;
1164                 }
1165
1166                 if (LONE_DASH(tar_filename)) {
1167                         tar_handle->src_fd = tar_fd;
1168                         tar_handle->seek = seek_by_read;
1169                 } else {
1170                         if (ENABLE_FEATURE_TAR_AUTODETECT
1171                          && flags == O_RDONLY
1172                          && !(opt & OPT_ANY_COMPRESS)
1173                         ) {
1174                                 tar_handle->src_fd = open_zipped(tar_filename, /*fail_if_not_compressed:*/ 0);
1175                                 if (tar_handle->src_fd < 0)
1176                                         bb_perror_msg_and_die("can't open '%s'", tar_filename);
1177                         } else {
1178                                 tar_handle->src_fd = xopen(tar_filename, flags);
1179                         }
1180                 }
1181         }
1182
1183         if (base_dir)
1184                 xchdir(base_dir);
1185
1186         //if (SEAMLESS_COMPRESSION)
1187         //      /* We need to know whether child (gzip/bzip/etc) exits abnormally */
1188         //      signal(SIGCHLD, check_errors_in_children);
1189
1190 #if ENABLE_FEATURE_TAR_CREATE
1191         /* Create an archive */
1192         if (opt & OPT_CREATE) {
1193 # if SEAMLESS_COMPRESSION
1194                 const char *zipMode = NULL;
1195                 if (opt & OPT_COMPRESS)
1196                         zipMode = "compress";
1197                 if (opt & OPT_GZIP)
1198                         zipMode = "gzip";
1199                 if (opt & OPT_BZIP2)
1200                         zipMode = "bzip2";
1201                 if (opt & OPT_LZMA)
1202                         zipMode = "lzma";
1203                 if (opt & OPT_XZ)
1204                         zipMode = "xz";
1205 # endif
1206                 /* NB: writeTarFile() closes tar_handle->src_fd */
1207                 return writeTarFile(tar_handle->src_fd, verboseFlag,
1208                                 (opt & OPT_DEREFERENCE ? ACTION_FOLLOWLINKS : 0)
1209                                 | (opt & OPT_NORECURSION ? 0 : ACTION_RECURSE),
1210                                 tar_handle->accept,
1211                                 tar_handle->reject, zipMode);
1212         }
1213 #endif
1214
1215         if (opt & OPT_ANY_COMPRESS) {
1216                 USE_FOR_MMU(IF_DESKTOP(long long) int FAST_FUNC (*xformer)(transformer_state_t *xstate);)
1217                 USE_FOR_NOMMU(const char *xformer_prog;)
1218
1219                 if (opt & OPT_COMPRESS) {
1220                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_Z(xformer = unpack_Z_stream;))
1221                         USE_FOR_NOMMU(xformer_prog = "uncompress";)
1222                 }
1223                 if (opt & OPT_GZIP) {
1224                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_GZ(xformer = unpack_gz_stream;))
1225                         USE_FOR_NOMMU(xformer_prog = "gunzip";)
1226                 }
1227                 if (opt & OPT_BZIP2) {
1228                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_BZ2(xformer = unpack_bz2_stream;))
1229                         USE_FOR_NOMMU(xformer_prog = "bunzip2";)
1230                 }
1231                 if (opt & OPT_LZMA) {
1232                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_LZMA(xformer = unpack_lzma_stream;))
1233                         USE_FOR_NOMMU(xformer_prog = "unlzma";)
1234                 }
1235                 if (opt & OPT_XZ) {
1236                         USE_FOR_MMU(IF_FEATURE_SEAMLESS_XZ(xformer = unpack_xz_stream;))
1237                         USE_FOR_NOMMU(xformer_prog = "unxz";)
1238                 }
1239
1240                 fork_transformer_with_sig(tar_handle->src_fd, xformer, xformer_prog);
1241                 /* Can't lseek over pipes */
1242                 tar_handle->seek = seek_by_read;
1243                 /*tar_handle->offset = 0; - already is */
1244         }
1245
1246         /* Zero processed headers (== empty file) is not a valid tarball.
1247          * We (ab)use bb_got_signal as exitcode here,
1248          * because check_errors_in_children() uses _it_ as error indicator.
1249          */
1250         bb_got_signal = EXIT_FAILURE;
1251
1252         while (get_header_tar(tar_handle) == EXIT_SUCCESS)
1253                 bb_got_signal = EXIT_SUCCESS; /* saw at least one header, good */
1254
1255         /* Check that every file that should have been extracted was */
1256         while (tar_handle->accept) {
1257                 if (!find_list_entry(tar_handle->reject, tar_handle->accept->data)
1258                  && !find_list_entry(tar_handle->passed, tar_handle->accept->data)
1259                 ) {
1260                         bb_error_msg_and_die("%s: not found in archive",
1261                                 tar_handle->accept->data);
1262                 }
1263                 tar_handle->accept = tar_handle->accept->link;
1264         }
1265         if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */)
1266                 close(tar_handle->src_fd);
1267
1268         if (SEAMLESS_COMPRESSION || OPT_COMPRESS) {
1269                 /* Set bb_got_signal to 1 if a child died with !0 exitcode */
1270                 check_errors_in_children(0);
1271         }
1272
1273         return bb_got_signal;
1274 }