archival/tar.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini tar implementation for busybox
   4  *
   5  * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
   6  * ground up.  It still has remnents of the old code lying about, but it is
   7  * very different now (i.e. cleaner, less global variables, etc)
   8  *
   9  * Copyright (C) 2000 by Lineo, inc.
  10  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
  11  *
  12  * Based in part in the tar implementation in sash
  13  *  Copyright (c) 1999 by David I. Bell
  14  *  Permission is granted to use, distribute, or modify this source,
  15  *  provided that this copyright notice remains intact.
  16  *  Permission to distribute sash derived code under the GPL has been granted.
  17  *
  18  * Based in part on the tar implementation from busybox-0.28
  19  *  Copyright (C) 1995 Bruce Perens
  20  *  This is free software under the GNU General Public License.
  21  *
  22  * This program is free software; you can redistribute it and/or modify
  23  * it under the terms of the GNU General Public License as published by
  24  * the Free Software Foundation; either version 2 of the License, or
  25  * (at your option) any later version.
  26  *
  27  * This program is distributed in the hope that it will be useful,
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  30  * General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public License
  33  * along with this program; if not, write to the Free Software
  34  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  35  *
  36  */
  37
  38
  39 #include "busybox.h"
  40 #define BB_DECLARE_EXTERN
  41 #define bb_need_io_error
  42 #define bb_need_name_longer_than_foo
  43 #include "messages.c"
  44 #include <stdio.h>
  45 #include <dirent.h>
  46 #include <errno.h>
  47 #include <fcntl.h>
  48 #include <signal.h>
  49 #include <time.h>
  50 #include <utime.h>
  51 #include <sys/types.h>
  52 #include <sys/sysmacros.h>
  53 #include <getopt.h>
  54
  55 /* Tar file constants  */
  56 #ifndef MAJOR
  57 #define MAJOR(dev) (((dev)>>8)&0xff)
  58 #define MINOR(dev) ((dev)&0xff)
  59 #endif
  60
  61 #define NAME_SIZE       100
  62
  63 /* POSIX tar Header Block, from POSIX 1003.1-1990  */
  64 struct TarHeader
  65 {
  66                                 /* byte offset */
  67         char name[NAME_SIZE];         /*   0-99 */
  68         char mode[8];                 /* 100-107 */
  69         char uid[8];                  /* 108-115 */
  70         char gid[8];                  /* 116-123 */
  71         char size[12];                /* 124-135 */
  72         char mtime[12];               /* 136-147 */
  73         char chksum[8];               /* 148-155 */
  74         char typeflag;                /* 156-156 */
  75         char linkname[NAME_SIZE];     /* 157-256 */
  76         char magic[6];                /* 257-262 */
  77         char version[2];              /* 263-264 */
  78         char uname[32];               /* 265-296 */
  79         char gname[32];               /* 297-328 */
  80         char devmajor[8];             /* 329-336 */
  81         char devminor[8];             /* 337-344 */
  82         char prefix[155];             /* 345-499 */
  83         char padding[12];             /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
  84 };
  85 typedef struct TarHeader TarHeader;
  86
  87
  88 /* A few useful constants */
  89 #define TAR_MAGIC          "ustar"        /* ustar and a null */
  90 #define TAR_VERSION        "  "           /* Be compatable with GNU tar format */
  91 #define TAR_MAGIC_LEN       6
  92 #define TAR_VERSION_LEN     2
  93 #define TAR_BLOCK_SIZE      512
  94
  95 /* A nice enum with all the possible tar file content types */
  96 enum TarFileType
  97 {
  98         REGTYPE  = '0',            /* regular file */
  99         REGTYPE0 = '\0',           /* regular file (ancient bug compat)*/
 100         LNKTYPE  = '1',            /* hard link */
 101         SYMTYPE  = '2',            /* symbolic link */
 102         CHRTYPE  = '3',            /* character special */
 103         BLKTYPE  = '4',            /* block special */
 104         DIRTYPE  = '5',            /* directory */
 105         FIFOTYPE = '6',            /* FIFO special */
 106         CONTTYPE = '7',            /* reserved */
 107         GNULONGLINK = 'K',         /* GNU long (>100 chars) link name */
 108         GNULONGNAME = 'L',         /* GNU long (>100 chars) file name */
 109 };
 110 typedef enum TarFileType TarFileType;
 111
 112 /* This struct ignores magic, non-numeric user name,
 113  * non-numeric group name, and the checksum, since
 114  * these are all ignored by BusyBox tar. */
 115 struct TarInfo
 116 {
 117         int              tarFd;          /* An open file descriptor for reading from the tarball */
 118         char *           name;           /* File name */
 119         mode_t           mode;           /* Unix mode, including device bits. */
 120         uid_t            uid;            /* Numeric UID */
 121         gid_t            gid;            /* Numeric GID */
 122         size_t           size;           /* Size of file */
 123         time_t           mtime;          /* Last-modified time */
 124         enum TarFileType type;           /* Regular, directory, link, etc */
 125         char *           linkname;       /* Name for symbolic and hard links */
 126         long             devmajor;       /* Major number for special device */
 127         long             devminor;       /* Minor number for special device */
 128 };
 129 typedef struct TarInfo TarInfo;
 130
 131 /* Local procedures to restore files from a tar file.  */
 132 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
 133                 int tostdoutFlag, int verboseFlag, char** extractList,
 134                 char** excludeList);
 135
 136
 137
 138 #ifdef BB_FEATURE_TAR_CREATE
 139 /* Local procedures to save files into a tar file.  */
 140 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
 141                 char** excludeList);
 142 #endif
 143
 144 extern int tar_main(int argc, char **argv)
 145 {
 146         char** excludeList=NULL;
 147         char** extractList=NULL;
 148 #if defined BB_FEATURE_TAR_EXCLUDE
 149         int excludeListSize=0;
 150 #endif
 151         const char *tarName="-";
 152         int listFlag     = FALSE;
 153         int extractFlag  = FALSE;
 154         int createFlag   = FALSE;
 155         int verboseFlag  = FALSE;
 156         int tostdoutFlag = FALSE;
 157         int firstOpt = TRUE;
 158         int stopIt;
 159         int status;
 160
 161
 162         if (argc <= 1)
 163                 usage(tar_usage);
 164
 165         while (*(++argv) && (**argv == '-' || firstOpt == TRUE)) {
 166                 firstOpt=FALSE;
 167                 stopIt=FALSE;
 168                 while (stopIt==FALSE && **argv) {
 169                         switch (*((*argv)++)) {
 170                                 case 'c':
 171                                         if (extractFlag == TRUE || listFlag == TRUE)
 172                                                 goto flagError;
 173                                         createFlag = TRUE;
 174                                         break;
 175                                 case 'x':
 176                                         if (listFlag == TRUE || createFlag == TRUE)
 177                                                 goto flagError;
 178                                         extractFlag = TRUE;
 179                                         break;
 180                                 case 't':
 181                                         if (extractFlag == TRUE || createFlag == TRUE)
 182                                                 goto flagError;
 183                                         listFlag = TRUE;
 184                                         break;
 185                                 case 'v':
 186                                         verboseFlag = TRUE;
 187                                         break;
 188                                 case 'O':
 189                                         tostdoutFlag = TRUE;
 190                                         break;
 191                                 case 'f':
 192                                         if (*tarName != '-')
 193                                                 fatalError( "Only one 'f' option allowed\n");
 194                                         tarName = *(++argv);
 195                                         if (tarName == NULL)
 196                                                 fatalError( "Option requires an argument: No file specified\n");
 197                                         stopIt=TRUE;
 198                                         break;
 199 #if defined BB_FEATURE_TAR_EXCLUDE
 200                                 case 'e':
 201                                         if (strcmp(*argv, "exclude")==0) {
 202                                                 excludeList=xrealloc( excludeList, sizeof(char**) * (excludeListSize+2));
 203                                                 excludeList[excludeListSize] = *(++argv);
 204                                                 if (excludeList[excludeListSize] == NULL)
 205                                                         fatalError( "Option requires an argument: No file specified\n");
 206                                                 /* Remove leading "/"s */
 207                                                 if (*excludeList[excludeListSize] =='/')
 208                                                         excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
 209                                                 /* Tack a NULL onto the end of the list */
 210                                                 excludeList[++excludeListSize] = NULL;
 211                                                 stopIt=TRUE;
 212                                                 break;
 213                                         }
 214 #endif
 215                                 case '-':
 216                                                 break;
 217                                 default:
 218                                         usage(tar_usage);
 219                         }
 220                 }
 221         }
 222
 223         /*
 224          * Do the correct type of action supplying the rest of the
 225          * command line arguments as the list of files to process.
 226          */
 227         if (createFlag == TRUE) {
 228 #ifndef BB_FEATURE_TAR_CREATE
 229                 fatalError( "This version of tar was not compiled with tar creation support.\n");
 230 #else
 231                 status = writeTarFile(tarName, verboseFlag, argv, excludeList);
 232 #endif
 233         }
 234         if (listFlag == TRUE || extractFlag == TRUE) {
 235                 if (*argv)
 236                         extractList = argv;
 237                 status = readTarFile(tarName, extractFlag, listFlag, tostdoutFlag,
 238                                         verboseFlag, extractList, excludeList);
 239         }
 240
 241         if (status == TRUE)
 242                 return EXIT_SUCCESS;
 243         else
 244                 return EXIT_FAILURE;
 245
 246   flagError:
 247         fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
 248 }
 249
 250 static void
 251 fixUpPermissions(TarInfo *header)
 252 {
 253         struct utimbuf t;
 254         /* Now set permissions etc for the new file */
 255         chown(header->name, header->uid, header->gid);
 256         chmod(header->name, header->mode);
 257         /* Reset the time */
 258         t.actime = time(0);
 259         t.modtime = header->mtime;
 260         utime(header->name, &t);
 261 }
 262
 263 static int
 264 tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
 265 {
 266         size_t  writeSize;
 267         size_t  readSize;
 268         size_t  actualWriteSz;
 269         char    buffer[BUFSIZ];
 270         size_t  size = header->size;
 271         int outFd=fileno(stdout);
 272
 273         /* Open the file to be written, if a file is supposed to be written */
 274         if (extractFlag==TRUE && tostdoutFlag==FALSE) {
 275                 /* Create the path to the file, just in case it isn't there...
 276                  * This should not screw up path permissions or anything. */
 277                 createPath(header->name, 0777);
 278                 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
 279                                                 header->mode & ~S_IFMT)) < 0) {
 280                         errorMsg(io_error, header->name, strerror(errno));
 281                         return( FALSE);
 282                 }
 283         }
 284
 285         /* Write out the file, if we are supposed to be doing that */
 286         while ( size > 0 ) {
 287                 actualWriteSz=0;
 288                 if ( size > sizeof(buffer) )
 289                         writeSize = readSize = sizeof(buffer);
 290                 else {
 291                         int mod = size % 512;
 292                         if ( mod != 0 )
 293                                 readSize = size + (512 - mod);
 294                         else
 295                                 readSize = size;
 296                         writeSize = size;
 297                 }
 298                 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
 299                         /* Tarball seems to have a problem */
 300                         errorMsg("Unexpected EOF in archive\n");
 301                         return( FALSE);
 302                 }
 303                 if ( readSize < writeSize )
 304                         writeSize = readSize;
 305
 306                 /* Write out the file, if we are supposed to be doing that */
 307                 if (extractFlag==TRUE) {
 308
 309                         if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
 310                                 /* Output file seems to have a problem */
 311                                 errorMsg(io_error, header->name, strerror(errno));
 312                                 return( FALSE);
 313                         }
 314                 } else {
 315                         actualWriteSz=writeSize;
 316                 }
 317
 318                 size -= actualWriteSz;
 319         }
 320
 321         /* Now we are done writing the file out, so try
 322          * and fix up the permissions and whatnot */
 323         if (extractFlag==TRUE && tostdoutFlag==FALSE) {
 324                 close(outFd);
 325                 fixUpPermissions(header);
 326         }
 327         return( TRUE);
 328 }
 329
 330 static int
 331 tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
 332 {
 333
 334         if (extractFlag==FALSE || tostdoutFlag==TRUE)
 335                 return( TRUE);
 336
 337         if (createPath(header->name, header->mode) != TRUE) {
 338                 errorMsg("%s: Cannot mkdir: %s\n",
 339                                 header->name, strerror(errno));
 340                 return( FALSE);
 341         }
 342         /* make the final component, just in case it was
 343          * omitted by createPath() (which will skip the
 344          * directory if it doesn't have a terminating '/') */
 345         if (mkdir(header->name, header->mode) == 0) {
 346                 fixUpPermissions(header);
 347         }
 348         return( TRUE);
 349 }
 350
 351 static int
 352 tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
 353 {
 354         if (extractFlag==FALSE || tostdoutFlag==TRUE)
 355                 return( TRUE);
 356
 357         if (link(header->linkname, header->name) < 0) {
 358                 errorMsg("%s: Cannot create hard link to '%s': %s\n",
 359                                 header->name, header->linkname, strerror(errno));
 360                 return( FALSE);
 361         }
 362
 363         /* Now set permissions etc for the new directory */
 364         fixUpPermissions(header);
 365         return( TRUE);
 366 }
 367
 368 static int
 369 tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
 370 {
 371         if (extractFlag==FALSE || tostdoutFlag==TRUE)
 372                 return( TRUE);
 373
 374 #ifdef  S_ISLNK
 375         if (symlink(header->linkname, header->name) < 0) {
 376                 errorMsg("%s: Cannot create symlink to '%s': %s\n",
 377                                 header->name, header->linkname, strerror(errno));
 378                 return( FALSE);
 379         }
 380         /* Try to change ownership of the symlink.
 381          * If libs doesn't support that, don't bother.
 382          * Changing the pointed-to-file is the Wrong Thing(tm).
 383          */
 384 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
 385         lchown(header->name, header->uid, header->gid);
 386 #endif
 387
 388         /* Do not change permissions or date on symlink,
 389          * since it changes the pointed to file instead.  duh. */
 390 #else
 391         errorMsg("%s: Cannot create symlink to '%s': %s\n",
 392                         header->name, header->linkname,
 393                         "symlinks not supported");
 394 #endif
 395         return( TRUE);
 396 }
 397
 398 static int
 399 tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
 400 {
 401         if (extractFlag==FALSE || tostdoutFlag==TRUE)
 402                 return( TRUE);
 403
 404         if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
 405                 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
 406                         errorMsg("%s: Cannot mknod: %s\n",
 407                                 header->name, strerror(errno));
 408                         return( FALSE);
 409                 }
 410         } else if (S_ISFIFO(header->mode)) {
 411                 if (mkfifo(header->name, header->mode) < 0) {
 412                         errorMsg("%s: Cannot mkfifo: %s\n",
 413                                 header->name, strerror(errno));
 414                         return( FALSE);
 415                 }
 416         }
 417
 418         /* Now set permissions etc for the new directory */
 419         fixUpPermissions(header);
 420         return( TRUE);
 421 }
 422
 423 /* Read an octal value in a field of the specified width, with optional
 424  * spaces on both sides of the number and with an optional null character
 425  * at the end.  Returns -1 on an illegal format.  */
 426 static long getOctal(const char *cp, int size)
 427 {
 428         long val = 0;
 429
 430         for(;(size > 0) && (*cp == ' '); cp++, size--);
 431         if ((size == 0) || !isOctal(*cp))
 432                 return -1;
 433         for(; (size > 0) && isOctal(*cp); size--) {
 434                 val = val * 8 + *cp++ - '0';
 435         }
 436         for (;(size > 0) && (*cp == ' '); cp++, size--);
 437         if ((size > 0) && *cp)
 438                 return -1;
 439         return val;
 440 }
 441
 442
 443 /* Parse the tar header and fill in the nice struct with the details */
 444 static int
 445 readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
 446 {
 447         int i;
 448         long chksum, sum=0;
 449         unsigned char *s = (unsigned char *)rawHeader;
 450
 451         header->name  = rawHeader->name;
 452         /* Check for and relativify any absolute paths */
 453         if ( *(header->name) == '/' ) {
 454                 static int alreadyWarned=FALSE;
 455
 456                 while (*(header->name) == '/')
 457                         ++*(header->name);
 458
 459                 if (alreadyWarned == FALSE) {
 460                         errorMsg("Removing leading '/' from member names\n");
 461                         alreadyWarned = TRUE;
 462                 }
 463         }
 464
 465         header->mode  = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
 466         header->uid   =  getOctal(rawHeader->uid, sizeof(rawHeader->uid));
 467         header->gid   =  getOctal(rawHeader->gid, sizeof(rawHeader->gid));
 468         header->size  = getOctal(rawHeader->size, sizeof(rawHeader->size));
 469         header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
 470         chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
 471         header->type  = rawHeader->typeflag;
 472         header->linkname  = rawHeader->linkname;
 473         header->devmajor  = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
 474         header->devminor  = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
 475
 476         /* Check the checksum */
 477         for (i = sizeof(*rawHeader); i-- != 0;) {
 478                 sum += *s++;
 479         }
 480         /* Remove the effects of the checksum field (replace
 481          * with blanks for the purposes of the checksum) */
 482         s = rawHeader->chksum;
 483         for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
 484                 sum -= *s++;
 485         }
 486         sum += ' ' * sizeof(rawHeader->chksum);
 487         if (sum == chksum )
 488                 return ( TRUE);
 489         return( FALSE);
 490 }
 491
 492
 493 /*
 494  * Read a tar file and extract or list the specified files within it.
 495  * If the list is empty than all files are extracted or listed.
 496  */
 497 static int readTarFile(const char* tarName, int extractFlag, int listFlag,
 498                 int tostdoutFlag, int verboseFlag, char** extractList,
 499                 char** excludeList)
 500 {
 501         int status, tarFd=-1;
 502         int errorFlag=FALSE;
 503         int skipNextHeaderFlag=FALSE;
 504         TarHeader rawHeader;
 505         TarInfo header;
 506         char** tmpList;
 507
 508         /* Open the tar file for reading.  */
 509         if (!strcmp(tarName, "-"))
 510                 tarFd = fileno(stdin);
 511         else
 512                 tarFd = open(tarName, O_RDONLY);
 513         if (tarFd < 0) {
 514                 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
 515                 return ( FALSE);
 516         }
 517
 518         /* Set the umask for this process so it doesn't
 519          * screw up permission setting for us later. */
 520         umask(0);
 521
 522         /* Read the tar file, and iterate over it one file at a time */
 523         while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
 524
 525                 /* Try to read the header */
 526                 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
 527                         if ( *(header.name) == '\0' ) {
 528                                 goto endgame;
 529                         } else {
 530                                 errorFlag=TRUE;
 531                                 errorMsg("Bad tar header, skipping\n");
 532                                 continue;
 533                         }
 534                 }
 535                 if ( *(header.name) == '\0' )
 536                                 goto endgame;
 537                 header.tarFd = tarFd;
 538
 539                 /* Skip funky extra GNU headers that precede long files */
 540                 if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
 541                         skipNextHeaderFlag=TRUE;
 542                         if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
 543                                 errorFlag = TRUE;
 544                         continue;
 545                 }
 546                 if ( skipNextHeaderFlag == TRUE ) {
 547                         skipNextHeaderFlag=FALSE;
 548                         errorMsg(name_longer_than_foo, NAME_SIZE);
 549                         if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
 550                                 errorFlag = TRUE;
 551                         continue;
 552                 }
 553
 554 #if defined BB_FEATURE_TAR_EXCLUDE
 555                 {
 556                         int skipFlag=FALSE;
 557                         /* Check for excluded files....  */
 558                         for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
 559                                 /* Do some extra hoop jumping for when directory names
 560                                  * end in '/' but the entry in tmpList doesn't */
 561                                 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
 562                                                         header.name[strlen(header.name)-1]=='/'
 563                                                         && strncmp( *tmpList, header.name,
 564                                                                 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
 565                                         /* If it is a regular file, pretend to extract it with
 566                                          * the extractFlag set to FALSE, so the junk in the tarball
 567                                          * is properly skipped over */
 568                                         if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
 569                                                 if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
 570                                                         errorFlag = TRUE;
 571                                         }
 572                                         skipFlag=TRUE;
 573                                         break;
 574                                 }
 575                         }
 576                         /* There are not the droids you're looking for, move along */
 577                         if (skipFlag==TRUE)
 578                                 continue;
 579                 }
 580 #endif
 581                 if (extractList != NULL) {
 582                         int skipFlag = TRUE;
 583                         for (tmpList = extractList; *tmpList != NULL; tmpList++) {
 584                                 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
 585                                                         header.name[strlen(header.name)-1]=='/'
 586                                                         && strncmp( *tmpList, header.name,
 587                                                                 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
 588                                         /* If it is a regular file, pretend to extract it with
 589                                          * the extractFlag set to FALSE, so the junk in the tarball
 590                                          * is properly skipped over */
 591                                         skipFlag = FALSE;
 592                                         memmove(extractList+1, extractList,
 593                                                                 sizeof(*extractList)*(tmpList-extractList));
 594                                         extractList++;
 595                                         break;
 596                                 }
 597                         }
 598                         /* There are not the droids you're looking for, move along */
 599                         if (skipFlag == TRUE) {
 600                                 if ( header.type==REGTYPE || header.type==REGTYPE0 )
 601                                         if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
 602                                                 errorFlag = TRUE;
 603                                 continue;
 604                         }
 605                 }
 606
 607                 if (listFlag == TRUE) {
 608                         /* Special treatment if the list (-t) flag is on */
 609                         if (verboseFlag == TRUE) {
 610                                 int len, len1;
 611                                 char buf[35];
 612                                 struct tm *tm = localtime (&(header.mtime));
 613
 614                                 len=printf("%s ", modeString(header.mode));
 615                                 memset(buf, 0, 8*sizeof(char));
 616                                 my_getpwuid(buf, header.uid);
 617                                 if (! *buf)
 618                                         len+=printf("%d", header.uid);
 619                                 else
 620                                         len+=printf("%s", buf);
 621                                 memset(buf, 0, 8*sizeof(char));
 622                                 my_getgrgid(buf, header.gid);
 623                                 if (! *buf)
 624                                         len+=printf("/%-d ", header.gid);
 625                                 else
 626                                         len+=printf("/%-s ", buf);
 627
 628                                 if (header.type==CHRTYPE || header.type==BLKTYPE) {
 629                                         len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
 630                                                         header.devmajor, header.devminor);
 631                                 } else {
 632                                         len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
 633                                 }
 634                                 /* Jump through some hoops to make the columns match up */
 635                                 for(;(len+len1)<31;len++)
 636                                         printf(" ");
 637                                 printf(buf);
 638
 639                                 /* Use ISO 8610 time format */
 640                                 if (tm) {
 641                                         printf ("%04d-%02d-%02d %02d:%02d:%02d ",
 642                                                         tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 643                                                         tm->tm_hour, tm->tm_min, tm->tm_sec);
 644                                 }
 645                         }
 646                         printf("%s", header.name);
 647                         if (verboseFlag == TRUE) {
 648                                 if (header.type==LNKTYPE)       /* If this is a link, say so */
 649                                         printf(" link to %s", header.linkname);
 650                                 else if (header.type==SYMTYPE)
 651                                         printf(" -> %s", header.linkname);
 652                         }
 653                         printf("\n");
 654                 }
 655
 656                 /* List contents if we are supposed to do that */
 657                 if (verboseFlag == TRUE && extractFlag == TRUE) {
 658                         /* Now the normal listing */
 659                         FILE *vbFd = stdout;
 660                         if (tostdoutFlag == TRUE)       // If the archive goes to stdout, verbose to stderr
 661                                 vbFd = stderr;
 662                         fprintf(vbFd, "%s\n", header.name);
 663                 }
 664
 665                 /* Remove files if we would overwrite them */
 666                 if (extractFlag == TRUE && tostdoutFlag == FALSE)
 667                         unlink(header.name);
 668
 669                 /* If we got here, we can be certain we have a legitimate
 670                  * header to work with.  So work with it.  */
 671                 switch ( header.type ) {
 672                         case REGTYPE:
 673                         case REGTYPE0:
 674                                 /* If the name ends in a '/' then assume it is
 675                                  * supposed to be a directory, and fall through */
 676                                 if (header.name[strlen(header.name)-1] != '/') {
 677                                         if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
 678                                                 errorFlag=TRUE;
 679                                         break;
 680                                 }
 681                         case DIRTYPE:
 682                                 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
 683                                         errorFlag=TRUE;
 684                                 break;
 685                         case LNKTYPE:
 686                                 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
 687                                         errorFlag=TRUE;
 688                                 break;
 689                         case SYMTYPE:
 690                                 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
 691                                         errorFlag=TRUE;
 692                                 break;
 693                         case CHRTYPE:
 694                         case BLKTYPE:
 695                         case FIFOTYPE:
 696                                 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
 697                                         errorFlag=TRUE;
 698                                 break;
 699 #if 0
 700                         /* Handled earlier */
 701                         case GNULONGNAME:
 702                         case GNULONGLINK:
 703                                 skipNextHeaderFlag=TRUE;
 704                                 break;
 705 #endif
 706                         default:
 707                                 errorMsg("Unknown file type '%c' in tar file\n", header.type);
 708                                 close( tarFd);
 709                                 return( FALSE);
 710                 }
 711         }
 712         close(tarFd);
 713         if (status > 0) {
 714                 /* Bummer - we read a partial header */
 715                 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
 716                 return ( FALSE);
 717         }
 718         else if (errorFlag==TRUE) {
 719                 errorMsg( "Error exit delayed from previous errors\n");
 720                 return( FALSE);
 721         } else
 722                 return( status);
 723
 724         /* Stuff to do when we are done */
 725 endgame:
 726         close( tarFd);
 727         if (extractList != NULL) {
 728                 for (; *extractList != NULL; extractList++) {
 729                         errorMsg("%s: Not found in archive\n", *extractList);
 730                         errorFlag = TRUE;
 731                 }
 732         }
 733         if ( *(header.name) == '\0' ) {
 734                 if (errorFlag==TRUE)
 735                         errorMsg( "Error exit delayed from previous errors\n");
 736                 else
 737                         return( TRUE);
 738         }
 739         return( FALSE);
 740 }
 741
 742
 743 #ifdef BB_FEATURE_TAR_CREATE
 744
 745 /* Some info to be carried along when creating a new tarball */
 746 struct TarBallInfo
 747 {
 748         char* fileName;               /* File name of the tarball */
 749         int tarFd;                    /* Open-for-write file descriptor
 750                                                                          for the tarball */
 751         struct stat statBuf;          /* Stat info for the tarball, letting
 752                                                                          us know the inode and device that the
 753                                                                          tarball lives, so we can avoid trying
 754                                                                          to include the tarball into itself */
 755         int verboseFlag;              /* Whether to print extra stuff or not */
 756         char** excludeList;           /* List of files to not include */
 757 };
 758 typedef struct TarBallInfo TarBallInfo;
 759
 760
 761 /* Put an octal string into the specified buffer.
 762  * The number is zero and space padded and possibly null padded.
 763  * Returns TRUE if successful.  */
 764 static int putOctal (char *cp, int len, long value)
 765 {
 766         int tempLength;
 767         char tempBuffer[32];
 768         char *tempString = tempBuffer;
 769
 770         /* Create a string of the specified length with an initial space,
 771          * leading zeroes and the octal number, and a trailing null.  */
 772         sprintf (tempString, "%0*lo", len - 1, value);
 773
 774         /* If the string is too large, suppress the leading space.  */
 775         tempLength = strlen (tempString) + 1;
 776         if (tempLength > len) {
 777                 tempLength--;
 778                 tempString++;
 779         }
 780
 781         /* If the string is still too large, suppress the trailing null.  */
 782         if (tempLength > len)
 783                 tempLength--;
 784
 785         /* If the string is still too large, fail.  */
 786         if (tempLength > len)
 787                 return FALSE;
 788
 789         /* Copy the string to the field.  */
 790         memcpy (cp, tempString, len);
 791
 792         return TRUE;
 793 }
 794
 795 /* Write out a tar header for the specified file/directory/whatever */
 796 static int
 797 writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
 798 {
 799         long chksum=0;
 800         struct TarHeader header;
 801 #if defined BB_FEATURE_TAR_EXCLUDE
 802         char** tmpList;
 803 #endif
 804         const unsigned char *cp = (const unsigned char *) &header;
 805         ssize_t size = sizeof(struct TarHeader);
 806
 807         memset( &header, 0, size);
 808
 809         if (*fileName=='/') {
 810                 static int alreadyWarned=FALSE;
 811                 if (alreadyWarned==FALSE) {
 812                         errorMsg("Removing leading '/' from member names\n");
 813                         alreadyWarned=TRUE;
 814                 }
 815                 strncpy(header.name, fileName+1, sizeof(header.name));
 816         }
 817         else {
 818                 strncpy(header.name, fileName, sizeof(header.name));
 819         }
 820
 821 #if defined BB_FEATURE_TAR_EXCLUDE
 822         /* Check for excluded files....  */
 823         for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
 824                 /* Do some extra hoop jumping for when directory names
 825                  * end in '/' but the entry in tmpList doesn't */
 826                 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
 827                                         header.name[strlen(header.name)-1]=='/'
 828                                         && strncmp( *tmpList, header.name,
 829                                                 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
 830                         /* Set the mode to something that is not a regular file, thereby
 831                          * faking out writeTarFile into thinking that nothing further need
 832                          * be done for this file.  Yes, I know this is ugly, but it works. */
 833                         statbuf->st_mode = 0;
 834                         return( TRUE);
 835                 }
 836         }
 837 #endif
 838
 839         putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
 840         putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
 841         putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
 842         putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
 843         putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
 844         strncpy(header.magic, TAR_MAGIC TAR_VERSION,
 845                         TAR_MAGIC_LEN + TAR_VERSION_LEN );
 846
 847         /* Enter the user and group names (default to root if it fails) */
 848         my_getpwuid(header.uname, statbuf->st_uid);
 849         if (! *header.uname)
 850                 strcpy(header.uname, "root");
 851         my_getgrgid(header.gname, statbuf->st_gid);
 852         if (! *header.uname)
 853                 strcpy(header.uname, "root");
 854
 855         /* WARNING/NOTICE: I break Hard Links */
 856         if (S_ISLNK(statbuf->st_mode)) {
 857                 int link_size=0;
 858                 char buffer[BUFSIZ];
 859                 header.typeflag  = SYMTYPE;
 860                 link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
 861                 if ( link_size < 0) {
 862                         errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
 863                         return ( FALSE);
 864                 }
 865                 buffer[link_size] = '\0';
 866                 strncpy(header.linkname, buffer, sizeof(header.linkname));
 867         } else if (S_ISDIR(statbuf->st_mode)) {
 868                 header.typeflag  = DIRTYPE;
 869                 strncat(header.name, "/", sizeof(header.name));
 870         } else if (S_ISCHR(statbuf->st_mode)) {
 871                 header.typeflag  = CHRTYPE;
 872                 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
 873                 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
 874         } else if (S_ISBLK(statbuf->st_mode)) {
 875                 header.typeflag  = BLKTYPE;
 876                 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
 877                 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
 878         } else if (S_ISFIFO(statbuf->st_mode)) {
 879                 header.typeflag  = FIFOTYPE;
 880         } else if (S_ISREG(statbuf->st_mode)) {
 881                 header.typeflag  = REGTYPE;
 882                 putOctal(header.size, sizeof(header.size), statbuf->st_size);
 883         } else {
 884                 errorMsg("%s: Unknown file type\n", fileName);
 885                 return ( FALSE);
 886         }
 887
 888         /* Calculate and store the checksum (i.e. the sum of all of the bytes of
 889          * the header).  The checksum field must be filled with blanks for the
 890          * calculation.  The checksum field is formatted differently from the
 891          * other fields: it has [6] digits, a null, then a space -- rather than
 892          * digits, followed by a null like the other fields... */
 893         memset(header.chksum, ' ', sizeof(header.chksum));
 894         cp = (const unsigned char *) &header;
 895         while (size-- > 0)
 896                 chksum += *cp++;
 897         putOctal(header.chksum, 7, chksum);
 898
 899         /* Now write the header out to disk */
 900         if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
 901                 errorMsg(io_error, fileName, strerror(errno));
 902                 return ( FALSE);
 903         }
 904         /* Pad the header up to the tar block size */
 905         for (; size<TAR_BLOCK_SIZE; size++) {
 906                 write(tbInfo->tarFd, "\0", 1);
 907         }
 908         /* Now do the verbose thing (or not) */
 909         if (tbInfo->verboseFlag==TRUE) {
 910                 FILE *vbFd = stdout;
 911                 if (tbInfo->tarFd == fileno(stdout))    // If the archive goes to stdout, verbose to stderr
 912                         vbFd = stderr;
 913                 fprintf(vbFd, "%s\n", header.name);
 914         }
 915
 916         return ( TRUE);
 917 }
 918
 919
 920 static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
 921 {
 922         struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
 923
 924         /* It is against the rules to archive a socket */
 925         if (S_ISSOCK(statbuf->st_mode)) {
 926                 errorMsg("%s: socket ignored\n", fileName);
 927                 return( TRUE);
 928         }
 929
 930         /* It is a bad idea to store the archive we are in the process of creating,
 931          * so check the device and inode to be sure that this particular file isn't
 932          * the new tarball */
 933         if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
 934                         tbInfo->statBuf.st_ino == statbuf->st_ino) {
 935                 errorMsg("%s: file is the archive; skipping\n", fileName);
 936                 return( TRUE);
 937         }
 938
 939         if (strlen(fileName) >= NAME_SIZE) {
 940                 errorMsg(name_longer_than_foo, NAME_SIZE);
 941                 return ( TRUE);
 942         }
 943
 944         if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
 945                 return( FALSE);
 946         }
 947
 948         /* Now, if the file is a regular file, copy it out to the tarball */
 949         if (S_ISREG(statbuf->st_mode)) {
 950                 int  inputFileFd;
 951                 char buffer[BUFSIZ];
 952                 ssize_t size=0, readSize=0;
 953
 954                 /* open the file we want to archive, and make sure all is well */
 955                 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
 956                         errorMsg("%s: Cannot open: %s\n", fileName, strerror(errno));
 957                         return( FALSE);
 958                 }
 959
 960                 /* write the file to the archive */
 961                 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
 962                         if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
 963                                 /* Output file seems to have a problem */
 964                                 errorMsg(io_error, fileName, strerror(errno));
 965                                 return( FALSE);
 966                         }
 967                         readSize+=size;
 968                 }
 969                 if (size == -1) {
 970                         errorMsg(io_error, fileName, strerror(errno));
 971                         return( FALSE);
 972                 }
 973                 /* Pad the file up to the tar block size */
 974                 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
 975                         write(tbInfo->tarFd, "\0", 1);
 976                 }
 977                 close( inputFileFd);
 978         }
 979
 980         return( TRUE);
 981 }
 982
 983 static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
 984                 char** excludeList)
 985 {
 986         int tarFd=-1;
 987         int errorFlag=FALSE;
 988         ssize_t size;
 989         struct TarBallInfo tbInfo;
 990         tbInfo.verboseFlag = verboseFlag;
 991
 992         /* Make sure there is at least one file to tar up.  */
 993         if (*argv == NULL)
 994                 fatalError("Cowardly refusing to create an empty archive\n");
 995
 996         /* Open the tar file for writing.  */
 997         if (!strcmp(tarName, "-"))
 998                 tbInfo.tarFd = fileno(stdout);
 999         else
1000                 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
1001         if (tbInfo.tarFd < 0) {
1002                 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
1003                 return ( FALSE);
1004         }
1005         tbInfo.excludeList=excludeList;
1006         /* Store the stat info for the tarball's file, so
1007          * can avoid including the tarball into itself....  */
1008         if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
1009                 fatalError(io_error, tarName, strerror(errno));
1010
1011         /* Set the umask for this process so it doesn't
1012          * screw up permission setting for us later. */
1013         umask(0);
1014
1015         /* Read the directory/files and iterate over them one at a time */
1016         while (*argv != NULL) {
1017                 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
1018                                         writeFileToTarball, writeFileToTarball,
1019                                         (void*) &tbInfo) == FALSE) {
1020                         errorFlag = TRUE;
1021                 }
1022         }
1023         /* Write two empty blocks to the end of the archive */
1024         for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
1025                 write(tbInfo.tarFd, "\0", 1);
1026         }
1027
1028         /* To be pedantically correct, we would check if the tarball
1029          * is smaller than 20 tar blocks, and pad it if it was smaller,
1030          * but that isn't necessary for GNU tar interoperability, and
1031          * so is considered a waste of space */
1032
1033         /* Hang up the tools, close up shop, head home */
1034         close(tarFd);
1035         if (errorFlag == TRUE) {
1036                 errorMsg("Error exit delayed from previous errors\n");
1037                 return(FALSE);
1038         }
1039         return( TRUE);
1040 }
1041
1042
1043 #endif
1044