libbb/unarchive.c

   1 /*
   2  *  Copyright (C) 2000 by Glenn McGrath
   3  *  Copyright (C) 2001 by Laurence Anderson
   4  *
   5  *  Based on previous work by busybox developers and others.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU Library General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include <stdio.h>
  23 #include <errno.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <utime.h>
  28 #include "libbb.h"
  29
  30 #define CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY 1
  31 #define CONFIG_FEATURE_TAR_GNU_EXTENSIONS
  32
  33 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
  34 static char *longname = NULL;
  35 static char *linkname = NULL;
  36 #endif
  37
  38 extern void seek_sub_file(FILE *src_stream, const int count);
  39 extern char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
  40                               const int function, const char *prefix);
  41
  42
  43 #ifdef L_archive_offset
  44 off_t archive_offset;
  45 #else
  46 extern off_t archive_offset;
  47 #endif
  48
  49 #ifdef L_seek_sub_file
  50 void seek_sub_file(FILE *src_stream, const int count)
  51 {
  52         int i;
  53         /* Try to fseek as faster */
  54         archive_offset += count;
  55         if (fseek(src_stream, count, SEEK_CUR) != 0 && errno == ESPIPE) {
  56         for (i = 0; i < count; i++) {
  57                 fgetc(src_stream);
  58                 }
  59         }
  60         return;
  61 }
  62 #endif
  63
  64
  65
  66 #ifdef L_extract_archive
  67 /* Extract the data postioned at src_stream to either filesystem, stdout or
  68  * buffer depending on the value of 'function' which is defined in libbb.h
  69  *
  70  * prefix doesnt have to be just a directory, it may prefix the filename as well.
  71  *
  72  * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
  73  * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
  74  * 'dpkg.' as their prefix
  75  *
  76  * For this reason if prefix does point to a dir then it must end with a
  77  * trailing '/' or else the last dir will be assumed to be the file prefix
  78  */
  79 char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
  80  const int function, const char *prefix)
  81 {
  82         FILE *dst_stream = NULL;
  83         char *full_name = NULL;
  84         char *full_link_name = NULL;
  85         char *buffer = NULL;
  86         struct utimbuf t;
  87         int res;
  88
  89
  90         /* prefix doesnt have to be a proper path it may prepend
  91          * the filename as well */
  92         if (prefix != NULL) {
  93                 /* strip leading '/' in filename to extract as prefix may not be dir */
  94                 /* Cant use concat_path_file here as prefix might not be a directory */
  95                 char *path = file_entry->name;
  96                 if (strncmp("./", path, 2) == 0) {
  97                         path += 2;
  98                         if (strlen(path) == 0) {
  99                                 return(NULL);
 100                         }
 101                 }
 102                 full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
 103                 strcpy(full_name, prefix);
 104                 strcat(full_name, path);
 105                 if ( file_entry->link_name ){
 106                    full_link_name = xmalloc(strlen(prefix) + strlen(file_entry->link_name) + 1);
 107                    strcpy(full_link_name, prefix);
 108                    strcat(full_link_name, file_entry->link_name);
 109                 }
 110         } else {
 111                 full_name = strdup(file_entry->name);
 112                 if ( file_entry->link_name )
 113                    full_link_name = strdup(file_entry->link_name);
 114         }
 115
 116
 117         if (function & extract_to_stdout) {
 118                 if (S_ISREG(file_entry->mode)) {
 119                         copy_file_chunk(src_stream, out_stream, file_entry->size);
 120                         archive_offset += file_entry->size;
 121                 }
 122         }
 123         else if (function & extract_one_to_buffer) {
 124                 if (S_ISREG(file_entry->mode)) {
 125                         buffer = (char *) xmalloc(file_entry->size + 1);
 126                         fread(buffer, 1, file_entry->size, src_stream);
 127                         buffer[file_entry->size] = '\0';
 128                         archive_offset += file_entry->size;
 129                         return(buffer);
 130                 }
 131         }
 132         else if (function & extract_all_to_fs) {
 133                 struct stat oldfile;
 134                 int stat_res;
 135                 stat_res = lstat (full_name, &oldfile);
 136                 if (stat_res == 0) { /* The file already exists */
 137                         if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
 138                                 if (!S_ISDIR(oldfile.st_mode)) {
 139                                         unlink(full_name); /* Directories might not be empty etc */
 140                                 }
 141                         } else {
 142                                 if ((function & extract_quiet) != extract_quiet) {
 143                                         error_msg("%s not created: newer or same age file exists", file_entry->name);
 144                                 }
 145                                 seek_sub_file(src_stream, file_entry->size);
 146                                 return (NULL);
 147                         }
 148                 }
 149                 if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
 150                         char *buf, *parent;
 151                         buf = xstrdup(full_name);
 152                         parent = dirname(buf);
 153                         if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
 154                                 if ((function & extract_quiet) != extract_quiet) {
 155                                         error_msg("couldn't create leading directories");
 156                                 }
 157                         }
 158                         free (buf);
 159                 }
 160                 switch(file_entry->mode & S_IFMT) {
 161                         case S_IFREG:
 162                                 if (file_entry->link_name) { /* Found a cpio hard link */
 163                                         if (link(full_link_name, full_name) != 0) {
 164                                                 if ((function & extract_quiet) != extract_quiet) {
 165                                                         perror_msg("Cannot link from %s to '%s'",
 166                                                                 file_entry->name, file_entry->link_name);
 167                                                 }
 168                                         }
 169                                 } else {
 170                                         if ((dst_stream = wfopen(full_name, "w")) == NULL) {
 171                                                 seek_sub_file(src_stream, file_entry->size);
 172                                                 return NULL;
 173                                         }
 174                                         archive_offset += file_entry->size;
 175                                         copy_file_chunk(src_stream, dst_stream, file_entry->size);
 176                                         fclose(dst_stream);
 177                                 }
 178                                 break;
 179                         case S_IFDIR:
 180                                 if (stat_res != 0) {
 181                                         if (mkdir(full_name, file_entry->mode) < 0) {
 182                                                 if ((function & extract_quiet) != extract_quiet) {
 183                                                         perror_msg("extract_archive: %s", full_name);
 184                                                 }
 185                                         }
 186                                 }
 187                                 break;
 188                         case S_IFLNK:
 189                                 if (symlink(file_entry->link_name, full_name) < 0) {
 190                                         if ((function & extract_quiet) != extract_quiet) {
 191                                                 perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
 192                                         }
 193                                         return NULL;
 194                                 }
 195                                 break;
 196                         case S_IFSOCK:
 197                         case S_IFBLK:
 198                         case S_IFCHR:
 199                         case S_IFIFO:
 200                                 if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
 201                                         if ((function & extract_quiet) != extract_quiet) {
 202                                                 perror_msg("Cannot create node %s", file_entry->name);
 203                                         }
 204                                         return NULL;
 205                                 }
 206                                 break;
 207                          default:
 208                             perror_msg("Don't know how to handle %s", full_name);
 209
 210                 }
 211
 212                 /* Changing a symlink's properties normally changes the properties of the
 213                  * file pointed to, so dont try and change the date or mode, lchown does
 214                  * does the right thing, but isnt available in older versions of libc */
 215                 if (S_ISLNK(file_entry->mode)) {
 216 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
 217                         lchown(full_name, file_entry->uid, file_entry->gid);
 218 #endif
 219                 } else {
 220                         if (function & extract_preserve_date) {
 221                                 t.actime = file_entry->mtime;
 222                                 t.modtime = file_entry->mtime;
 223                                 utime(full_name, &t);
 224                         }
 225                         chown(full_name, file_entry->uid, file_entry->gid);
 226                         chmod(full_name, file_entry->mode);
 227                 }
 228         } else {
 229                 /* If we arent extracting data we have to skip it,
 230                  * if data size is 0 then then just do it anyway
 231                  * (saves testing for it) */
 232                 seek_sub_file(src_stream, file_entry->size);
 233         }
 234
 235         /* extract_list and extract_verbose_list can be used in conjunction
 236          * with one of the above four extraction functions, so do this seperately */
 237         if (function & extract_verbose_list) {
 238                 fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
 239                         file_entry->uid, file_entry->gid,
 240                         (int) file_entry->size, time_string(file_entry->mtime));
 241         }
 242         if ((function & extract_list) || (function & extract_verbose_list)){
 243                 /* fputs doesnt add a trailing \n, so use fprintf */
 244                 fprintf(out_stream, "%s\n", file_entry->name);
 245         }
 246
 247         free(full_name);
 248         if ( full_link_name )
 249             free(full_link_name);
 250
 251         return(NULL); /* Maybe we should say if failed */
 252 }
 253 #endif
 254
 255 #ifdef L_unarchive
 256 char *unarchive(FILE *src_stream, FILE *out_stream,
 257                 file_header_t *(*get_headers)(FILE *),
 258                 void (*free_headers)(file_header_t *),
 259                 const int extract_function, const char *prefix, char **extract_names)
 260 {
 261         file_header_t *file_entry;
 262         int extract_flag;
 263         int i;
 264         char *buffer = NULL;
 265
 266         archive_offset = 0;
 267         while ((file_entry = get_headers(src_stream)) != NULL) {
 268                 extract_flag = TRUE;
 269                 /* fprintf(stderr, __FUNCTION__ " getting headers\n"); */
 270                 if (extract_names != NULL) {
 271                         int found_flag = FALSE;
 272                         for(i = 0; extract_names[i] != 0; i++) {
 273                                 if (strcmp(extract_names[i], file_entry->name) == 0) {
 274                                         found_flag = TRUE;
 275                                         break;
 276                                 }
 277                         }
 278                         if (extract_function & extract_exclude_list) {
 279                                 if (found_flag == TRUE) {
 280                                         extract_flag = FALSE;
 281                                 }
 282                         } else {
 283                                 /* If its not found in the include list dont extract it */
 284                                 if (found_flag == FALSE) {
 285                                         extract_flag = FALSE;
 286                                 }
 287                         }
 288
 289                 }
 290
 291                 if (extract_flag == TRUE) {
 292                         /* fprintf(stderr, __FUNCTION__ " extract?\n"); */
 293                         buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
 294                         /* fprintf(stderr, __FUNCTION__ " extracted\n"); */
 295                 } else {
 296                         /* seek past the data entry */
 297                         seek_sub_file(src_stream, file_entry->size);
 298                 }
 299                 free_headers(file_entry);
 300         }
 301         /*fprintf(stderr, __FUNCTION__ " goin home\n");*/
 302
 303         return(buffer);
 304 }
 305 #endif
 306
 307 #ifdef L_get_header_ar
 308 file_header_t *get_header_ar(FILE *src_stream)
 309 {
 310         file_header_t *typed;
 311         union {
 312                 char raw[60];
 313                 struct {
 314                         char name[16];
 315                         char date[12];
 316                         char uid[6];
 317                         char gid[6];
 318                         char mode[8];
 319                         char size[10];
 320                         char magic[2];
 321                 } formated;
 322         } ar;
 323         static char *ar_long_names;
 324
 325         if (fread(ar.raw, 1, 60, src_stream) != 60) {
 326                 return(NULL);
 327         }
 328         archive_offset += 60;
 329         /* align the headers based on the header magic */
 330         if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
 331                 /* some version of ar, have an extra '\n' after each data entry,
 332                  * this puts the next header out by 1 */
 333                 if (ar.formated.magic[1] != '`') {
 334                         error_msg("Invalid magic");
 335                         return(NULL);
 336                 }
 337                 /* read the next char out of what would be the data section,
 338                  * if its a '\n' then it is a valid header offset by 1*/
 339                 archive_offset++;
 340                 if (fgetc(src_stream) != '\n') {
 341                         error_msg("Invalid magic");
 342                         return(NULL);
 343                 }
 344                 /* fix up the header, we started reading 1 byte too early */
 345                 /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
 346                 memmove(ar.raw, &ar.raw[1], 59);
 347         }
 348
 349         typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
 350
 351         typed->size = (size_t) atoi(ar.formated.size);
 352         /* long filenames have '/' as the first character */
 353         if (ar.formated.name[0] == '/') {
 354                 if (ar.formated.name[1] == '/') {
 355                         /* If the second char is a '/' then this entries data section
 356                          * stores long filename for multiple entries, they are stored
 357                          * in static variable long_names for use in future entries */
 358                         ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
 359                         fread(ar_long_names, 1, typed->size, src_stream);
 360                         archive_offset += typed->size;
 361                         /* This ar entries data section only contained filenames for other records
 362                          * they are stored in the static ar_long_names for future reference */
 363                         return (get_header_ar(src_stream)); /* Return next header */
 364                 } else if (ar.formated.name[1] == ' ') {
 365                         /* This is the index of symbols in the file for compilers */
 366                         seek_sub_file(src_stream, typed->size);
 367                         return (get_header_ar(src_stream)); /* Return next header */
 368                 } else {
 369                         /* The number after the '/' indicates the offset in the ar data section
 370                         (saved in variable long_name) that conatains the real filename */
 371                         if (!ar_long_names) {
 372                                 error_msg("Cannot resolve long file name");
 373                                 return (NULL);
 374                         }
 375                         typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
 376                 }
 377         } else {
 378                 /* short filenames */
 379                 typed->name = xcalloc(1, 16);
 380                 strncpy(typed->name, ar.formated.name, 16);
 381         }
 382         typed->name[strcspn(typed->name, " /")]='\0';
 383
 384         /* convert the rest of the now valid char header to its typed struct */
 385         parse_mode(ar.formated.mode, &typed->mode);
 386         typed->mtime = atoi(ar.formated.date);
 387         typed->uid = atoi(ar.formated.uid);
 388         typed->gid = atoi(ar.formated.gid);
 389
 390         return(typed);
 391 }
 392
 393 void free_header_ar(file_header_t *ar_entry)
 394 {
 395     if (ar_entry == NULL) {
 396         return;
 397     }
 398
 399     free(ar_entry->name);
 400     free(ar_entry->link_name);
 401
 402     free(ar_entry);
 403 }
 404 #endif
 405
 406 #ifdef L_get_header_cpio
 407 struct hardlinks {
 408         file_header_t *entry;
 409         int inode;
 410         struct hardlinks *next;
 411 };
 412
 413 file_header_t *get_header_cpio(FILE *src_stream)
 414 {
 415         file_header_t *cpio_entry = NULL;
 416         char cpio_header[110];
 417         int namesize;
 418         char dummy[16];
 419         int major, minor, nlink, inode;
 420         static struct hardlinks *saved_hardlinks = NULL;
 421         static int pending_hardlinks = 0;
 422
 423
 424         if (pending_hardlinks) { /* Deal with any pending hardlinks */
 425                 struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
 426                 while (tmp) {
 427                         if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
 428                                 cpio_entry = tmp->entry;
 429                                 if (oldtmp) oldtmp->next = tmp->next; /* Remove item from linked list */
 430                                 else saved_hardlinks = tmp->next;
 431                                 free(tmp);
 432                                 return (cpio_entry);
 433                         }
 434                         oldtmp = tmp;
 435                         tmp = tmp->next;
 436                 }
 437                 pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
 438         }
 439
 440         /* There can be padding before archive header */
 441         seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
 442         if (fread(cpio_header, 1, 110, src_stream) == 110) {
 443                 archive_offset += 110;
 444                 if (strncmp(cpio_header, "07070", 5) != 0) {
 445                         error_msg("Unsupported format or invalid magic");
 446                         return(NULL);
 447                 }
 448                 switch (cpio_header[5]) {
 449                         case '2': /* "crc" header format */
 450                                 /* Doesnt do the crc check yet */
 451                         case '1': /* "newc" header format */
 452                                 cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
 453                                 sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
 454                                         dummy, &inode, (unsigned int*)&cpio_entry->mode,
 455                                         (unsigned int*)&cpio_entry->uid, (unsigned int*)&cpio_entry->gid,
 456                                         &nlink, &cpio_entry->mtime, (unsigned long*)&cpio_entry->size,
 457                                         dummy, &major, &minor, &namesize, dummy);
 458
 459                                 cpio_entry->name = (char *) xcalloc(1, namesize);
 460                                 fread(cpio_entry->name, 1, namesize, src_stream); /* Read in filename */
 461                                 archive_offset += namesize;
 462                                 /* Skip padding before file contents */
 463                                 seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
 464                                 if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
 465                                         printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
 466                                         if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
 467                                                 struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
 468                                                 while (tmp) {
 469                                                         error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
 470                                                         oldtmp = tmp;
 471                                                         tmp = tmp->next;
 472                                                         free (oldtmp->entry->name);
 473                                                         free (oldtmp->entry);
 474                                                         free (oldtmp);
 475                                                 }
 476                                                 saved_hardlinks = NULL;
 477                                                 pending_hardlinks = 0;
 478                                         }
 479                                         return(NULL);
 480                                 }
 481
 482                                 if (S_ISLNK(cpio_entry->mode)) {
 483                                         cpio_entry->link_name = (char *) xcalloc(1, cpio_entry->size + 1);
 484                                         fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
 485                                         archive_offset += cpio_entry->size;
 486                                         cpio_entry->size = 0; /* Stop possiable seeks in future */
 487                                 }
 488                                 if (nlink > 1 && !S_ISDIR(cpio_entry->mode)) {
 489                                         if (cpio_entry->size == 0) { /* Put file on a linked list for later */
 490                                                 struct hardlinks *new = xmalloc(sizeof(struct hardlinks));
 491                                                 new->next = saved_hardlinks;
 492                                                 new->inode = inode;
 493                                                 new->entry = cpio_entry;
 494                                                 saved_hardlinks = new;
 495                                         return(get_header_cpio(src_stream)); /* Recurse to next file */
 496                                         } else { /* Found the file with data in */
 497                                                 struct hardlinks *tmp = saved_hardlinks;
 498                                                 pending_hardlinks = 1;
 499                                                 while (tmp) {
 500                                                         if (tmp->inode == inode) {
 501                                                                 tmp->entry->link_name = xstrdup(cpio_entry->name);
 502                                                                 nlink--;
 503                                                         }
 504                                                         tmp = tmp->next;
 505                                                 }
 506                                                 if (nlink > 1) error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
 507                                         }
 508                                 }
 509                                 cpio_entry->device = (major << 8) | minor;
 510                                 break;
 511                         default:
 512                                 error_msg("Unsupported format");
 513                                 return(NULL);
 514                 }
 515                 if (ferror(src_stream) || feof(src_stream)) {
 516                         perror_msg("Stream error");
 517                         return(NULL);
 518                 }
 519         }
 520         return(cpio_entry);
 521 }
 522 #endif
 523
 524 #ifdef L_get_header_tar
 525 file_header_t *get_header_tar(FILE *tar_stream)
 526 {
 527
 528         union {
 529                 unsigned char raw[512];
 530                 struct {
 531                         char name[100];         /*   0-99 */
 532                         char mode[8];           /* 100-107 */
 533                         char uid[8];            /* 108-115 */
 534                         char gid[8];            /* 116-123 */
 535                         char size[12];          /* 124-135 */
 536                         char mtime[12];         /* 136-147 */
 537                         char chksum[8];         /* 148-155 */
 538                         char typeflag;          /* 156-156 */
 539                         char linkname[100];     /* 157-256 */
 540                         char magic[6];          /* 257-262 */
 541                         char version[2];        /* 263-264 */
 542                         char uname[32];         /* 265-296 */
 543                         char gname[32];         /* 297-328 */
 544                         char devmajor[8];       /* 329-336 */
 545                         char devminor[8];       /* 337-344 */
 546                         char prefix[155];       /* 345-499 */
 547                         char padding[12];       /* 500-512 */
 548                 } formated;
 549         } tar;
 550         file_header_t *tar_entry = NULL;
 551         long i;
 552         long sum = 0;
 553
 554         if (archive_offset % 512 != 0) {
 555                 seek_sub_file(tar_stream, 512 - (archive_offset % 512));
 556         }
 557
 558         if (fread(tar.raw, 1, 512, tar_stream) != 512) {
 559                 /* Unfortunatly its common for tar files to have all sorts of
 560                  * trailing garbage, fail silently */
 561 //              error_msg("Couldnt read header");
 562                 return(NULL);
 563         }
 564         archive_offset += 512;
 565
 566         /* Check header has valid magic, unfortunately some tar files
 567          * have empty (0'ed) tar entries at the end, which will
 568          * cause this to fail, so fail silently for now
 569          */
 570         if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
 571 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
 572                 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
 573 #endif
 574                 return(NULL);
 575         }
 576
 577         /* Do checksum on headers */
 578         for (i =  0; i < 148 ; i++) {
 579                 sum += tar.raw[i];
 580         }
 581         sum += ' ' * 8;
 582         for (i =  156; i < 512 ; i++) {
 583                 sum += tar.raw[i];
 584         }
 585         if (sum != strtol(tar.formated.chksum, NULL, 8)) {
 586                 if ( strtol(tar.formated.chksum,NULL,8) != 0 )
 587                         error_msg("Invalid tar header checksum");
 588                 return(NULL);
 589         }
 590
 591         /* convert to type'ed variables */
 592         tar_entry = xcalloc(1, sizeof(file_header_t));
 593
 594 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
 595         if (longname) {
 596                 tar_entry->name = longname;
 597                 longname = NULL;
 598         }
 599         else if (linkname) {
 600                 tar_entry->name = linkname;
 601                 linkname = NULL;
 602         } else
 603 #endif
 604         if (tar.formated.prefix[0] == 0) {
 605                 tar_entry->name = strdup(tar.formated.name);
 606         } else {
 607                 tar_entry->name = concat_path_file(tar.formated.prefix, tar.formated.name);
 608         }
 609
 610         // tar_entry->name = xstrdup(tar.formated.name);
 611
 612 /*
 613         parse_mode(tar.formated.mode, &tar_entry->mode);
 614 */
 615         tar_entry->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
 616
 617         tar_entry->uid   = strtol(tar.formated.uid, NULL, 8);
 618         tar_entry->gid   = strtol(tar.formated.gid, NULL, 8);
 619         tar_entry->size  = strtol(tar.formated.size, NULL, 8);
 620         tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
 621         tar_entry->link_name  = strlen(tar.formated.linkname) ?
 622             xstrdup(tar.formated.linkname) : NULL;
 623         tar_entry->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) +
 624                 strtol(tar.formated.devminor, NULL, 8);
 625
 626         /* Fix mode, used by the old format */
 627         switch (tar.formated.typeflag) {
 628         /* hard links are detected as regular files with 0 size and a link name */
 629         case '1':
 630                 tar_entry->mode |= S_IFREG ;
 631                 break;
 632         case 0:
 633         case '0':
 634
 635 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
 636                 if (last_char_is(tar_entry->name, '/')) {
 637                         tar_entry->mode |= S_IFDIR;
 638                 } else
 639 # endif
 640                         tar_entry->mode |= S_IFREG;
 641                 break;
 642         case '2':
 643                 tar_entry->mode |= S_IFLNK;
 644                 break;
 645         case '3':
 646                 tar_entry->mode |= S_IFCHR;
 647                 break;
 648         case '4':
 649                 tar_entry->mode |= S_IFBLK;
 650                 break;
 651         case '5':
 652                 tar_entry->mode |= S_IFDIR;
 653                 break;
 654         case '6':
 655                 tar_entry->mode |= S_IFIFO;
 656                 break;
 657 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
 658         case 'L': {
 659                         longname = xmalloc(tar_entry->size + 1);
 660                         if(fread(longname, tar_entry->size, 1, tar_stream) != 1)
 661                                 return NULL;
 662                         longname[tar_entry->size] = '\0';
 663                         archive_offset += tar_entry->size;
 664
 665                         return(get_header_tar(tar_stream));
 666                 }
 667         case 'K': {
 668                         linkname = xmalloc(tar_entry->size + 1);
 669                         if(fread(linkname, tar_entry->size, 1, tar_stream) != 1)
 670                                 return NULL;
 671                         linkname[tar_entry->size] = '\0';
 672                         archive_offset += tar_entry->size;
 673
 674                         tar_entry->name = linkname;
 675                         return(get_header_tar(tar_stream));
 676                 }
 677         case 'D':
 678         case 'M':
 679         case 'N':
 680         case 'S':
 681         case 'V':
 682                 perror_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
 683 # endif
 684         default:
 685                 perror_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
 686                 break;
 687
 688         }
 689
 690         return(tar_entry);
 691 }
 692
 693 void free_header_tar(file_header_t *tar_entry)
 694 {
 695     if (tar_entry == NULL) {
 696         return;
 697     }
 698
 699     free(tar_entry->name);
 700     free(tar_entry->link_name);
 701
 702     free(tar_entry);
 703 }
 704
 705 #endif
 706
 707 #ifdef L_deb_extract
 708 char *deb_extract(const char *package_filename, FILE *out_stream,
 709                   const int extract_function, const char *prefix, const char *filename)
 710 {
 711         FILE *deb_stream;
 712         FILE *uncompressed_stream = NULL;
 713         file_header_t *ar_header = NULL;
 714         char **file_list = NULL;
 715         char *output_buffer = NULL;
 716         char *ared_file = NULL;
 717         char ar_magic[8];
 718         int gunzip_pid = 0;
 719
 720         if (filename != NULL) {
 721                 file_list = xmalloc(sizeof(char *) * 2);
 722                 file_list[0] = xstrdup(filename);
 723                 file_list[1] = NULL;
 724         }
 725
 726         if (extract_function & extract_control_tar_gz) {
 727                 ared_file = xstrdup("control.tar.gz");
 728         }
 729         else if (extract_function & extract_data_tar_gz) {
 730                 ared_file = xstrdup("data.tar.gz");
 731         } else {
 732                 fprintf(stderr, "no file specified to extract -- extract_function=%x\n", extract_function);
 733                 return NULL;
 734         }
 735
 736         /* open the debian package to be worked on */
 737         deb_stream = wfopen(package_filename, "r");
 738         if (deb_stream == NULL) {
 739                 return(NULL);
 740         }
 741         /* set the buffer size */
 742         setvbuf(deb_stream, NULL, _IOFBF, 0x8000);
 743
 744         /* check ar magic */
 745         fread(ar_magic, 1, 8, deb_stream);
 746         /*fprintf(stderr, "deb_extract ar_magic=%08x\n", *(long *)ar_magic);*/
 747         if (strncmp(ar_magic,"!<arch>",7) == 0) {
 748                 archive_offset = 8;
 749
 750                 while ((ar_header = get_header_ar(deb_stream)) != NULL) {
 751                         if (strcmp(ared_file, ar_header->name) == 0) {
 752                                 /* open a stream of decompressed data */
 753                                 uncompressed_stream = gz_open(deb_stream, &gunzip_pid);
 754                                 archive_offset = 0;
 755                                 output_buffer = unarchive(uncompressed_stream, out_stream, get_header_tar, free_header_tar, extract_function, prefix, file_list);
 756                         }
 757                         seek_sub_file(deb_stream, ar_header->size);
 758                         free (ar_header->name);
 759                         free (ar_header);
 760                 }
 761                 gz_close(gunzip_pid);
 762                 fclose(deb_stream);
 763                 fclose(uncompressed_stream);
 764                 free(ared_file);
 765                 return(output_buffer);
 766         } else if (strncmp(ar_magic, "\037\213", 2) == 0) {
 767                 /* it's a gz file, let's assume it's an opkg */
 768                 int unzipped_opkg_pid;
 769                 FILE *unzipped_opkg_stream;
 770                 file_header_t *tar_header;
 771                 archive_offset = 0;
 772                 fseek(deb_stream, 0, SEEK_SET);
 773                 unzipped_opkg_stream = gz_open(deb_stream, &unzipped_opkg_pid);
 774
 775                 /*fprintf(stderr, __FUNCTION__ ": processing opkg %s -- ared_file=%s\n", package_filename, ared_file);*/
 776                 /* walk through outer tar file to find ared_file */
 777                 while ((tar_header = get_header_tar(unzipped_opkg_stream)) != NULL) {
 778                         int name_offset = 0;
 779                         if (strncmp(tar_header->name, "./", 2) == 0)
 780                                 name_offset = 2;
 781                         if (strcmp(ared_file, tar_header->name+name_offset) == 0) {
 782                                 /* open a stream of decompressed data */
 783                                 uncompressed_stream = gz_open(unzipped_opkg_stream, &gunzip_pid);
 784                                 archive_offset = 0;
 785                                 /*fprintf(stderr, __FUNCTION__ ":%d: here -- found file\n", __LINE__);*/
 786                                 output_buffer = unarchive(uncompressed_stream,
 787                                                           out_stream,
 788                                                           get_header_tar,
 789                                                           free_header_tar,
 790                                                           extract_function,
 791                                                           prefix,
 792                                                           file_list);
 793                                 /*fprintf(stderr, __FUNCTION__ ":%d: unarchive complete\n", __LINE__);*/
 794                                 free_header_tar(tar_header);
 795                                 gz_close(gunzip_pid);
 796                                 fclose(uncompressed_stream);
 797                                 break;
 798                         }
 799                         seek_sub_file(unzipped_opkg_stream, tar_header->size);
 800                         free_header_tar(tar_header);
 801                 }
 802                 gz_close(unzipped_opkg_pid);
 803                 fclose(unzipped_opkg_stream);
 804                 fclose(deb_stream);
 805                 free(ared_file);
 806                 /*fprintf(stderr, __FUNCTION__ ":%d: done\n", __LINE__);*/
 807                 return output_buffer;
 808         } else {
 809                 error_msg_and_die("invalid magic");
 810         }
 811
 812 }
 813 #endif