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