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