More cleanup in error paths to plug leaks found while installing dbus.
[project/opkg-lede.git] / 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 extern ssize_t seek_by_read(FILE* fd, size_t len);
42
43
44 #ifdef L_archive_offset
45 off_t archive_offset;
46 #else
47 extern off_t archive_offset;
48 #endif
49
50 #ifdef L_seek_sub_file
51 #define SEEK_BUF 4096
52 ssize_t seek_by_read(FILE* fd, size_t len)
53 {
54 ssize_t cc, total = 0;
55 char buf[SEEK_BUF];
56
57 while (len) {
58 cc = fread(buf, sizeof(buf[0]),
59 len > SEEK_BUF ? SEEK_BUF : len,
60 fd);
61
62 total += cc;
63 len -= cc;
64
65 if(feof(fd) || ferror(fd))
66 break;
67 }
68 return total;
69 }
70
71 void seek_sub_file(FILE *src_stream, const int count)
72 {
73 /* Try to fseek as faster */
74 archive_offset += count;
75 seek_by_read(src_stream, count);
76 return;
77 }
78 #endif
79
80
81
82 #ifdef L_extract_archive
83 /* Extract the data postioned at src_stream to either filesystem, stdout or
84 * buffer depending on the value of 'function' which is defined in libbb.h
85 *
86 * prefix doesnt have to be just a directory, it may prefix the filename as well.
87 *
88 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
89 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
90 * 'dpkg.' as their prefix
91 *
92 * For this reason if prefix does point to a dir then it must end with a
93 * trailing '/' or else the last dir will be assumed to be the file prefix
94 */
95 char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
96 const int function, const char *prefix)
97 {
98 FILE *dst_stream = NULL;
99 char *full_name = NULL;
100 char *full_link_name = NULL;
101 char *buffer = NULL;
102 struct utimbuf t;
103
104
105 /* prefix doesnt have to be a proper path it may prepend
106 * the filename as well */
107 if (prefix != NULL) {
108 /* strip leading '/' in filename to extract as prefix may not be dir */
109 /* Cant use concat_path_file here as prefix might not be a directory */
110 char *path = file_entry->name;
111 if (strncmp("./", path, 2) == 0) {
112 path += 2;
113 if (strlen(path) == 0) {
114 return(NULL);
115 }
116 }
117 full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
118 strcpy(full_name, prefix);
119 strcat(full_name, path);
120 if ( file_entry->link_name ){
121 full_link_name = xmalloc(strlen(prefix) + strlen(file_entry->link_name) + 1);
122 strcpy(full_link_name, prefix);
123 strcat(full_link_name, file_entry->link_name);
124 }
125 } else {
126 full_name = strdup(file_entry->name);
127 if ( file_entry->link_name )
128 full_link_name = strdup(file_entry->link_name);
129 }
130
131
132 if (function & extract_to_stdout) {
133 if (S_ISREG(file_entry->mode)) {
134 copy_file_chunk(src_stream, out_stream, file_entry->size);
135 archive_offset += file_entry->size;
136 }
137 }
138 else if (function & extract_one_to_buffer) {
139 if (S_ISREG(file_entry->mode)) {
140 buffer = (char *) xmalloc(file_entry->size + 1);
141 fread(buffer, 1, file_entry->size, src_stream);
142 buffer[file_entry->size] = '\0';
143 archive_offset += file_entry->size;
144 goto cleanup;
145 }
146 }
147 else if (function & extract_all_to_fs) {
148 struct stat oldfile;
149 int stat_res;
150 stat_res = lstat (full_name, &oldfile);
151 if (stat_res == 0) { /* The file already exists */
152 if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
153 if (!S_ISDIR(oldfile.st_mode)) {
154 unlink(full_name); /* Directories might not be empty etc */
155 }
156 } else {
157 if ((function & extract_quiet) != extract_quiet) {
158 error_msg("%s not created: newer or same age file exists", file_entry->name);
159 }
160 seek_sub_file(src_stream, file_entry->size);
161 goto cleanup;
162 }
163 }
164 if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
165 char *buf, *parent;
166 buf = xstrdup(full_name);
167 parent = dirname(buf);
168 if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
169 if ((function & extract_quiet) != extract_quiet) {
170 error_msg("couldn't create leading directories");
171 }
172 }
173 free (buf);
174 }
175 switch(file_entry->mode & S_IFMT) {
176 case S_IFREG:
177 if (file_entry->link_name) { /* Found a cpio hard link */
178 if (link(full_link_name, full_name) != 0) {
179 if ((function & extract_quiet) != extract_quiet) {
180 perror_msg("Cannot link from %s to '%s'",
181 file_entry->name, file_entry->link_name);
182 }
183 }
184 } else {
185 if ((dst_stream = wfopen(full_name, "w")) == NULL) {
186 seek_sub_file(src_stream, file_entry->size);
187 goto cleanup;
188 }
189 archive_offset += file_entry->size;
190 copy_file_chunk(src_stream, dst_stream, file_entry->size);
191 fclose(dst_stream);
192 }
193 break;
194 case S_IFDIR:
195 if (stat_res != 0) {
196 if (mkdir(full_name, file_entry->mode) < 0) {
197 if ((function & extract_quiet) != extract_quiet) {
198 perror_msg("extract_archive: %s", full_name);
199 }
200 }
201 }
202 break;
203 case S_IFLNK:
204 if (symlink(file_entry->link_name, full_name) < 0) {
205 if ((function & extract_quiet) != extract_quiet) {
206 perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
207 }
208 goto cleanup;
209 }
210 break;
211 case S_IFSOCK:
212 case S_IFBLK:
213 case S_IFCHR:
214 case S_IFIFO:
215 if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
216 if ((function & extract_quiet) != extract_quiet) {
217 perror_msg("Cannot create node %s", file_entry->name);
218 }
219 goto cleanup;
220 }
221 break;
222 default:
223 perror_msg("Don't know how to handle %s", full_name);
224
225 }
226
227 /* Changing a symlink's properties normally changes the properties of the
228 * file pointed to, so dont try and change the date or mode, lchown does
229 * does the right thing, but isnt available in older versions of libc */
230 if (S_ISLNK(file_entry->mode)) {
231 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
232 lchown(full_name, file_entry->uid, file_entry->gid);
233 #endif
234 } else {
235 if (function & extract_preserve_date) {
236 t.actime = file_entry->mtime;
237 t.modtime = file_entry->mtime;
238 utime(full_name, &t);
239 }
240 chown(full_name, file_entry->uid, file_entry->gid);
241 chmod(full_name, file_entry->mode);
242 }
243 } else {
244 /* If we arent extracting data we have to skip it,
245 * if data size is 0 then then just do it anyway
246 * (saves testing for it) */
247 seek_sub_file(src_stream, file_entry->size);
248 }
249
250 /* extract_list and extract_verbose_list can be used in conjunction
251 * with one of the above four extraction functions, so do this seperately */
252 if (function & extract_verbose_list) {
253 fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
254 file_entry->uid, file_entry->gid,
255 (int) file_entry->size, time_string(file_entry->mtime));
256 }
257 if ((function & extract_list) || (function & extract_verbose_list)){
258 /* fputs doesnt add a trailing \n, so use fprintf */
259 fprintf(out_stream, "%s\n", file_entry->name);
260 }
261
262 cleanup:
263 free(full_name);
264 if ( full_link_name )
265 free(full_link_name);
266
267 return(buffer); /* Maybe we should say if failed */
268 }
269 #endif
270
271 #ifdef L_unarchive
272 char *unarchive(FILE *src_stream, FILE *out_stream,
273 file_header_t *(*get_headers)(FILE *),
274 void (*free_headers)(file_header_t *),
275 const int extract_function, const char *prefix, char **extract_names)
276 {
277 file_header_t *file_entry;
278 int extract_flag;
279 int i;
280 char *buffer = NULL;
281
282 archive_offset = 0;
283 while ((file_entry = get_headers(src_stream)) != NULL) {
284 extract_flag = TRUE;
285 /* fprintf(stderr, __FUNCTION__ " getting headers\n"); */
286 if (extract_names != NULL) {
287 int found_flag = FALSE;
288 for(i = 0; extract_names[i] != 0; i++) {
289 if (strcmp(extract_names[i], file_entry->name) == 0) {
290 found_flag = TRUE;
291 break;
292 }
293 }
294 if (extract_function & extract_exclude_list) {
295 if (found_flag == TRUE) {
296 extract_flag = FALSE;
297 }
298 } else {
299 /* If its not found in the include list dont extract it */
300 if (found_flag == FALSE) {
301 extract_flag = FALSE;
302 }
303 }
304
305 }
306
307 if (extract_flag == TRUE) {
308 /* fprintf(stderr, __FUNCTION__ " extract?\n"); */
309 buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
310 /* fprintf(stderr, __FUNCTION__ " extracted\n"); */
311 } else {
312 /* seek past the data entry */
313 seek_sub_file(src_stream, file_entry->size);
314 }
315 free_headers(file_entry);
316 }
317 /*fprintf(stderr, __FUNCTION__ " goin home\n");*/
318
319 return(buffer);
320 }
321 #endif
322
323 #ifdef L_get_header_ar
324 file_header_t *get_header_ar(FILE *src_stream)
325 {
326 file_header_t *typed;
327 union {
328 char raw[60];
329 struct {
330 char name[16];
331 char date[12];
332 char uid[6];
333 char gid[6];
334 char mode[8];
335 char size[10];
336 char magic[2];
337 } formated;
338 } ar;
339 static char *ar_long_names;
340
341 if (fread(ar.raw, 1, 60, src_stream) != 60) {
342 return(NULL);
343 }
344 archive_offset += 60;
345 /* align the headers based on the header magic */
346 if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
347 /* some version of ar, have an extra '\n' after each data entry,
348 * this puts the next header out by 1 */
349 if (ar.formated.magic[1] != '`') {
350 error_msg("Invalid magic");
351 return(NULL);
352 }
353 /* read the next char out of what would be the data section,
354 * if its a '\n' then it is a valid header offset by 1*/
355 archive_offset++;
356 if (fgetc(src_stream) != '\n') {
357 error_msg("Invalid magic");
358 return(NULL);
359 }
360 /* fix up the header, we started reading 1 byte too early */
361 /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
362 memmove(ar.raw, &ar.raw[1], 59);
363 }
364
365 typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
366
367 typed->size = (size_t) atoi(ar.formated.size);
368 /* long filenames have '/' as the first character */
369 if (ar.formated.name[0] == '/') {
370 if (ar.formated.name[1] == '/') {
371 /* If the second char is a '/' then this entries data section
372 * stores long filename for multiple entries, they are stored
373 * in static variable long_names for use in future entries */
374 ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
375 fread(ar_long_names, 1, typed->size, src_stream);
376 archive_offset += typed->size;
377 /* This ar entries data section only contained filenames for other records
378 * they are stored in the static ar_long_names for future reference */
379 return (get_header_ar(src_stream)); /* Return next header */
380 } else if (ar.formated.name[1] == ' ') {
381 /* This is the index of symbols in the file for compilers */
382 seek_sub_file(src_stream, typed->size);
383 return (get_header_ar(src_stream)); /* Return next header */
384 } else {
385 /* The number after the '/' indicates the offset in the ar data section
386 (saved in variable long_name) that conatains the real filename */
387 if (!ar_long_names) {
388 error_msg("Cannot resolve long file name");
389 return (NULL);
390 }
391 typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
392 }
393 } else {
394 /* short filenames */
395 typed->name = xcalloc(1, 16);
396 strncpy(typed->name, ar.formated.name, 16);
397 }
398 typed->name[strcspn(typed->name, " /")]='\0';
399
400 /* convert the rest of the now valid char header to its typed struct */
401 parse_mode(ar.formated.mode, &typed->mode);
402 typed->mtime = atoi(ar.formated.date);
403 typed->uid = atoi(ar.formated.uid);
404 typed->gid = atoi(ar.formated.gid);
405
406 return(typed);
407 }
408
409 void free_header_ar(file_header_t *ar_entry)
410 {
411 if (ar_entry == NULL) {
412 return;
413 }
414
415 free(ar_entry->name);
416 free(ar_entry->link_name);
417
418 free(ar_entry);
419 }
420 #endif
421
422 #ifdef L_get_header_cpio
423 struct hardlinks {
424 file_header_t *entry;
425 int inode;
426 struct hardlinks *next;
427 };
428
429 file_header_t *get_header_cpio(FILE *src_stream)
430 {
431 file_header_t *cpio_entry = NULL;
432 char cpio_header[110];
433 int namesize;
434 char dummy[16];
435 int major, minor, nlink, inode;
436 static struct hardlinks *saved_hardlinks = NULL;
437 static int pending_hardlinks = 0;
438
439
440 if (pending_hardlinks) { /* Deal with any pending hardlinks */
441 struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
442 while (tmp) {
443 if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
444 cpio_entry = tmp->entry;
445 if (oldtmp) oldtmp->next = tmp->next; /* Remove item from linked list */
446 else saved_hardlinks = tmp->next;
447 free(tmp);
448 return (cpio_entry);
449 }
450 oldtmp = tmp;
451 tmp = tmp->next;
452 }
453 pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
454 }
455
456 /* There can be padding before archive header */
457 seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
458 if (fread(cpio_header, 1, 110, src_stream) == 110) {
459 archive_offset += 110;
460 if (strncmp(cpio_header, "07070", 5) != 0) {
461 error_msg("Unsupported format or invalid magic");
462 return(NULL);
463 }
464 switch (cpio_header[5]) {
465 case '2': /* "crc" header format */
466 /* Doesnt do the crc check yet */
467 case '1': /* "newc" header format */
468 cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
469 sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
470 dummy, &inode, (unsigned int*)&cpio_entry->mode,
471 (unsigned int*)&cpio_entry->uid, (unsigned int*)&cpio_entry->gid,
472 &nlink, &cpio_entry->mtime, (unsigned long*)&cpio_entry->size,
473 dummy, &major, &minor, &namesize, dummy);
474
475 cpio_entry->name = (char *) xcalloc(1, namesize);
476 fread(cpio_entry->name, 1, namesize, src_stream); /* Read in filename */
477 archive_offset += namesize;
478 /* Skip padding before file contents */
479 seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
480 if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
481 printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
482 if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
483 struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
484 while (tmp) {
485 error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
486 oldtmp = tmp;
487 tmp = tmp->next;
488 free (oldtmp->entry->name);
489 free (oldtmp->entry);
490 free (oldtmp);
491 }
492 saved_hardlinks = NULL;
493 pending_hardlinks = 0;
494 }
495 return(NULL);
496 }
497
498 if (S_ISLNK(cpio_entry->mode)) {
499 cpio_entry->link_name = (char *) xcalloc(1, cpio_entry->size + 1);
500 fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
501 archive_offset += cpio_entry->size;
502 cpio_entry->size = 0; /* Stop possiable seeks in future */
503 }
504 if (nlink > 1 && !S_ISDIR(cpio_entry->mode)) {
505 if (cpio_entry->size == 0) { /* Put file on a linked list for later */
506 struct hardlinks *new = xmalloc(sizeof(struct hardlinks));
507 new->next = saved_hardlinks;
508 new->inode = inode;
509 new->entry = cpio_entry;
510 saved_hardlinks = new;
511 return(get_header_cpio(src_stream)); /* Recurse to next file */
512 } else { /* Found the file with data in */
513 struct hardlinks *tmp = saved_hardlinks;
514 pending_hardlinks = 1;
515 while (tmp) {
516 if (tmp->inode == inode) {
517 tmp->entry->link_name = xstrdup(cpio_entry->name);
518 nlink--;
519 }
520 tmp = tmp->next;
521 }
522 if (nlink > 1) error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
523 }
524 }
525 cpio_entry->device = (major << 8) | minor;
526 break;
527 default:
528 error_msg("Unsupported format");
529 return(NULL);
530 }
531 if (ferror(src_stream) || feof(src_stream)) {
532 perror_msg("Stream error");
533 return(NULL);
534 }
535 }
536 return(cpio_entry);
537 }
538 #endif
539
540 #ifdef L_get_header_tar
541 file_header_t *get_header_tar(FILE *tar_stream)
542 {
543
544 union {
545 unsigned char raw[512];
546 struct {
547 char name[100]; /* 0-99 */
548 char mode[8]; /* 100-107 */
549 char uid[8]; /* 108-115 */
550 char gid[8]; /* 116-123 */
551 char size[12]; /* 124-135 */
552 char mtime[12]; /* 136-147 */
553 char chksum[8]; /* 148-155 */
554 char typeflag; /* 156-156 */
555 char linkname[100]; /* 157-256 */
556 char magic[6]; /* 257-262 */
557 char version[2]; /* 263-264 */
558 char uname[32]; /* 265-296 */
559 char gname[32]; /* 297-328 */
560 char devmajor[8]; /* 329-336 */
561 char devminor[8]; /* 337-344 */
562 char prefix[155]; /* 345-499 */
563 char padding[12]; /* 500-512 */
564 } formated;
565 } tar;
566 file_header_t *tar_entry = NULL;
567 long i;
568 long sum = 0;
569
570 if (archive_offset % 512 != 0) {
571 seek_sub_file(tar_stream, 512 - (archive_offset % 512));
572 }
573
574 if (fread(tar.raw, 1, 512, tar_stream) != 512) {
575 /* Unfortunatly its common for tar files to have all sorts of
576 * trailing garbage, fail silently */
577 // error_msg("Couldnt read header");
578 return(NULL);
579 }
580 archive_offset += 512;
581
582 /* Check header has valid magic, unfortunately some tar files
583 * have empty (0'ed) tar entries at the end, which will
584 * cause this to fail, so fail silently for now
585 */
586 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
587 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
588 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
589 #endif
590 return(NULL);
591 }
592
593 /* Do checksum on headers */
594 for (i = 0; i < 148 ; i++) {
595 sum += tar.raw[i];
596 }
597 sum += ' ' * 8;
598 for (i = 156; i < 512 ; i++) {
599 sum += tar.raw[i];
600 }
601 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
602 if ( strtol(tar.formated.chksum,NULL,8) != 0 )
603 error_msg("Invalid tar header checksum");
604 return(NULL);
605 }
606
607 /* convert to type'ed variables */
608 tar_entry = xcalloc(1, sizeof(file_header_t));
609
610 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
611 if (longname) {
612 tar_entry->name = longname;
613 longname = NULL;
614 }
615 else if (linkname) {
616 tar_entry->name = linkname;
617 linkname = NULL;
618 } else
619 #endif
620 {
621 tar_entry->name = xstrndup(tar.formated.name, 100);
622
623 if (tar.formated.prefix[0]) {
624 char *temp = tar_entry->name;
625 char *prefixTemp = xstrndup(tar.formated.prefix, 155);
626 tar_entry->name = concat_path_file(prefixTemp, temp);
627 free(temp);
628 free(prefixTemp);
629 }
630 }
631
632 // tar_entry->name = xstrdup(tar.formated.name);
633
634 /*
635 parse_mode(tar.formated.mode, &tar_entry->mode);
636 */
637 tar_entry->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
638
639 tar_entry->uid = strtol(tar.formated.uid, NULL, 8);
640 tar_entry->gid = strtol(tar.formated.gid, NULL, 8);
641 tar_entry->size = strtol(tar.formated.size, NULL, 8);
642 tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
643 tar_entry->link_name = *tar.formated.linkname != '\0' ? xstrndup(tar.formated.linkname, 100) : NULL;
644 tar_entry->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) +
645 strtol(tar.formated.devminor, NULL, 8);
646
647 /* Fix mode, used by the old format */
648 switch (tar.formated.typeflag) {
649 /* hard links are detected as regular files with 0 size and a link name */
650 case '1':
651 tar_entry->mode |= S_IFREG ;
652 break;
653 case 0:
654 case '0':
655
656 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
657 if (last_char_is(tar_entry->name, '/')) {
658 tar_entry->mode |= S_IFDIR;
659 } else
660 # endif
661 tar_entry->mode |= S_IFREG;
662 break;
663 case '2':
664 tar_entry->mode |= S_IFLNK;
665 break;
666 case '3':
667 tar_entry->mode |= S_IFCHR;
668 break;
669 case '4':
670 tar_entry->mode |= S_IFBLK;
671 break;
672 case '5':
673 tar_entry->mode |= S_IFDIR;
674 break;
675 case '6':
676 tar_entry->mode |= S_IFIFO;
677 break;
678 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
679 case 'L': {
680 longname = xmalloc(tar_entry->size + 1);
681 if(fread(longname, tar_entry->size, 1, tar_stream) != 1)
682 return NULL;
683 longname[tar_entry->size] = '\0';
684 archive_offset += tar_entry->size;
685
686 return(get_header_tar(tar_stream));
687 }
688 case 'K': {
689 linkname = xmalloc(tar_entry->size + 1);
690 if(fread(linkname, tar_entry->size, 1, tar_stream) != 1)
691 return NULL;
692 linkname[tar_entry->size] = '\0';
693 archive_offset += tar_entry->size;
694
695 tar_entry->name = linkname;
696 return(get_header_tar(tar_stream));
697 }
698 case 'D':
699 case 'M':
700 case 'N':
701 case 'S':
702 case 'V':
703 perror_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
704 # endif
705 default:
706 perror_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
707 break;
708
709 }
710
711 return(tar_entry);
712 }
713
714 void free_header_tar(file_header_t *tar_entry)
715 {
716 if (tar_entry == NULL) {
717 return;
718 }
719
720 free(tar_entry->name);
721 free(tar_entry->link_name);
722
723 free(tar_entry);
724 }
725
726 #endif
727
728 #ifdef L_deb_extract
729 char *deb_extract(const char *package_filename, FILE *out_stream,
730 const int extract_function, const char *prefix, const char *filename)
731 {
732 FILE *deb_stream;
733 FILE *uncompressed_stream = NULL;
734 file_header_t *ar_header = NULL;
735 char **file_list = NULL;
736 char *output_buffer = NULL;
737 char *ared_file = NULL;
738 char ar_magic[8];
739 int gunzip_pid = 0;
740
741 if (filename != NULL) {
742 file_list = xmalloc(sizeof(char *) * 2);
743 file_list[0] = xstrdup(filename);
744 file_list[1] = NULL;
745 }
746
747 if (extract_function & extract_control_tar_gz) {
748 ared_file = xstrdup("control.tar.gz");
749 }
750 else if (extract_function & extract_data_tar_gz) {
751 ared_file = xstrdup("data.tar.gz");
752 } else {
753 fprintf(stderr, "no file specified to extract -- extract_function=%x\n", extract_function);
754 goto cleanup;
755 }
756
757 /* open the debian package to be worked on */
758 deb_stream = wfopen(package_filename, "r");
759 if (deb_stream == NULL) {
760 goto cleanup;
761 }
762 /* set the buffer size */
763 setvbuf(deb_stream, NULL, _IOFBF, 0x8000);
764
765 /* check ar magic */
766 fread(ar_magic, 1, 8, deb_stream);
767 /*fprintf(stderr, "deb_extract ar_magic=%08x\n", *(long *)ar_magic);*/
768 if (strncmp(ar_magic,"!<arch>",7) == 0) {
769 archive_offset = 8;
770
771 while ((ar_header = get_header_ar(deb_stream)) != NULL) {
772 if (strcmp(ared_file, ar_header->name) == 0) {
773 /* open a stream of decompressed data */
774 uncompressed_stream = gz_open(deb_stream, &gunzip_pid);
775 if (uncompressed_stream == NULL) {
776 goto cleanup;
777 }
778
779 archive_offset = 0;
780 output_buffer = unarchive(uncompressed_stream, out_stream, get_header_tar, free_header_tar, extract_function, prefix, file_list);
781 }
782 seek_sub_file(deb_stream, ar_header->size);
783 free (ar_header->name);
784 free (ar_header);
785 }
786 gz_close(gunzip_pid);
787 fclose(uncompressed_stream);
788 goto cleanup;
789 } else if (strncmp(ar_magic, "\037\213", 2) == 0) {
790 /* it's a gz file, let's assume it's an opkg */
791 int unzipped_opkg_pid;
792 FILE *unzipped_opkg_stream;
793 file_header_t *tar_header;
794 archive_offset = 0;
795 fseek(deb_stream, 0, SEEK_SET);
796 unzipped_opkg_stream = gz_open(deb_stream, &unzipped_opkg_pid);
797 if (unzipped_opkg_stream == NULL) {
798 goto cleanup;
799 }
800
801 /*fprintf(stderr, __FUNCTION__ ": processing opkg %s -- ared_file=%s\n", package_filename, ared_file);*/
802 /* walk through outer tar file to find ared_file */
803 while ((tar_header = get_header_tar(unzipped_opkg_stream)) != NULL) {
804 int name_offset = 0;
805 if (strncmp(tar_header->name, "./", 2) == 0)
806 name_offset = 2;
807 if (strcmp(ared_file, tar_header->name+name_offset) == 0) {
808 /* open a stream of decompressed data */
809 uncompressed_stream = gz_open(unzipped_opkg_stream, &gunzip_pid);
810 if (uncompressed_stream == NULL) {
811 goto cleanup;
812 }
813 archive_offset = 0;
814 /*fprintf(stderr, __FUNCTION__ ":%d: here -- found file\n", __LINE__);*/
815 output_buffer = unarchive(uncompressed_stream,
816 out_stream,
817 get_header_tar,
818 free_header_tar,
819 extract_function,
820 prefix,
821 file_list);
822 /*fprintf(stderr, __FUNCTION__ ":%d: unarchive complete\n", __LINE__);*/
823 free_header_tar(tar_header);
824 gz_close(gunzip_pid);
825 fclose(uncompressed_stream);
826 break;
827 }
828 seek_sub_file(unzipped_opkg_stream, tar_header->size);
829 free_header_tar(tar_header);
830 }
831 gz_close(unzipped_opkg_pid);
832 fclose(unzipped_opkg_stream);
833 /*fprintf(stderr, __FUNCTION__ ":%d: done\n", __LINE__);*/
834 goto cleanup;
835 } else {
836 error_msg_and_die("invalid magic");
837 }
838
839 cleanup:
840 free(ared_file);
841 if (deb_stream)
842 fclose(deb_stream);
843 if (file_list) {
844 free(file_list[0]);
845 free(file_list);
846 }
847
848 return output_buffer;
849 }
850 #endif