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