2 * Copyright (C) 2000 by Glenn McGrath
3 * Copyright (C) 2001 by Laurence Anderson
5 * Based on previous work by busybox developers and others.
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.
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.
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.
33 #define CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY 1
34 #define CONFIG_FEATURE_TAR_GNU_EXTENSIONS
36 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
37 static char *longname
= NULL
;
38 static char *linkname
= NULL
;
43 static ssize_t
seek_forward(struct gzip_handle
*zh
, ssize_t len
)
45 ssize_t slen
= gzip_seek(zh
, len
);
48 archive_offset
+= len
;
53 /* Extract the data postioned at src_stream to either filesystem, stdout or
54 * buffer depending on the value of 'function' which is defined in libbb.h
56 * prefix doesnt have to be just a directory, it may prefix the filename as well.
58 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
59 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
60 * 'dpkg.' as their prefix
62 * For this reason if prefix does point to a dir then it must end with a
63 * trailing '/' or else the last dir will be assumed to be the file prefix
65 static char *extract_archive(struct gzip_handle
*src_stream
, FILE * out_stream
,
66 const file_header_t
* file_entry
,
67 const int function
, const char *prefix
, int *err
)
69 FILE *dst_stream
= NULL
;
70 char *full_name
= NULL
;
71 char *full_link_name
= NULL
;
77 /* prefix doesnt have to be a proper path it may prepend
78 * the filename as well */
80 /* strip leading '/' in filename to extract as prefix may not be dir */
81 /* Cant use concat_path_file here as prefix might not be a directory */
82 char *path
= file_entry
->name
;
83 if (strncmp("./", path
, 2) == 0) {
85 if (strlen(path
) == 0)
86 /* Do nothing, current dir already exists. */
89 full_name
= xmalloc(strlen(prefix
) + strlen(path
) + 1);
90 strcpy(full_name
, prefix
);
91 strcat(full_name
, path
);
92 if (file_entry
->link_name
) {
94 xmalloc(strlen(prefix
) +
95 strlen(file_entry
->link_name
) + 1);
96 strcpy(full_link_name
, prefix
);
97 strcat(full_link_name
, file_entry
->link_name
);
100 full_name
= xstrdup(file_entry
->name
);
101 if (file_entry
->link_name
)
102 full_link_name
= xstrdup(file_entry
->link_name
);
105 if (function
& extract_to_stream
) {
106 if (S_ISREG(file_entry
->mode
)) {
108 gzip_copy(src_stream
, out_stream
, file_entry
->size
);
109 archive_offset
+= file_entry
->size
;
111 } else if (function
& extract_one_to_buffer
) {
112 if (S_ISREG(file_entry
->mode
)) {
113 buffer
= (char *)xmalloc(file_entry
->size
+ 1);
114 gzip_read(src_stream
, buffer
, file_entry
->size
);
115 buffer
[file_entry
->size
] = '\0';
116 archive_offset
+= file_entry
->size
;
119 } else if (function
& extract_all_to_fs
) {
122 stat_res
= lstat(full_name
, &oldfile
);
123 if (stat_res
== 0) { /* The file already exists */
124 if ((function
& extract_unconditional
)
125 || (oldfile
.st_mtime
< file_entry
->mtime
)) {
126 if (!S_ISDIR(oldfile
.st_mode
)) {
127 unlink(full_name
); /* Directories might not be empty etc */
130 if ((function
& extract_quiet
) != extract_quiet
) {
133 ("%s not created: newer or same age file exists",
136 seek_forward(src_stream
, file_entry
->size
);
140 if (function
& extract_create_leading_dirs
) { /* Create leading directories with default umask */
142 buf
= xstrdup(full_name
);
143 parent
= dirname(buf
);
144 if (make_directory(parent
, -1, FILEUTILS_RECUR
) != 0) {
145 if ((function
& extract_quiet
) != extract_quiet
) {
148 ("couldn't create leading directories");
153 switch (file_entry
->mode
& S_IFMT
) {
155 if (file_entry
->link_name
) { /* Found a cpio hard link */
156 if (link(full_link_name
, full_name
) != 0) {
157 if ((function
& extract_quiet
) !=
161 ("Cannot link from %s to '%s'",
163 file_entry
->link_name
);
168 wfopen(full_name
, "w")) == NULL
) {
170 seek_forward(src_stream
,
174 archive_offset
+= file_entry
->size
;
176 gzip_copy(src_stream
, dst_stream
,
183 if (mkdir(full_name
, file_entry
->mode
) < 0) {
184 if ((function
& extract_quiet
) !=
187 perror_msg("Cannot make dir %s",
194 if (symlink(file_entry
->link_name
, full_name
) < 0) {
195 if ((function
& extract_quiet
) != extract_quiet
) {
198 ("Cannot create symlink from %s to '%s'",
200 file_entry
->link_name
);
210 (full_name
, file_entry
->mode
,
211 file_entry
->device
) == -1) {
212 if ((function
& extract_quiet
) != extract_quiet
) {
214 perror_msg("Cannot create node %s",
222 perror_msg("Don't know how to handle %s", full_name
);
226 /* Changing a symlink's properties normally changes the properties of the
227 * file pointed to, so dont try and change the date or mode, lchown does
228 * does the right thing, but isnt available in older versions of libc */
229 if (S_ISLNK(file_entry
->mode
)) {
230 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
231 lchown(full_name
, file_entry
->uid
, file_entry
->gid
);
234 if (function
& extract_preserve_date
) {
235 t
.actime
= file_entry
->mtime
;
236 t
.modtime
= file_entry
->mtime
;
237 utime(full_name
, &t
);
239 chown(full_name
, file_entry
->uid
, file_entry
->gid
);
240 chmod(full_name
, file_entry
->mode
);
243 /* If we arent extracting data we have to skip it,
244 * if data size is 0 then then just do it anyway
245 * (saves testing for it) */
246 seek_forward(src_stream
, file_entry
->size
);
249 /* extract_list and extract_verbose_list can be used in conjunction
250 * with one of the above four extraction functions, so do this seperately */
251 if (function
& extract_verbose_list
) {
252 fprintf(out_stream
, "%s %d/%d %8d %s ",
253 mode_string(file_entry
->mode
), file_entry
->uid
,
254 file_entry
->gid
, (int)file_entry
->size
,
255 time_string(file_entry
->mtime
));
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
);
265 free(full_link_name
);
270 static char *unarchive(struct gzip_handle
*src_stream
, FILE * out_stream
,
271 file_header_t
* (*get_headers
) (struct gzip_handle
*),
272 void (*free_headers
) (file_header_t
*),
273 const int extract_function
,
274 const char *prefix
, const char **extract_names
, int *err
)
276 file_header_t
*file_entry
;
284 while ((file_entry
= get_headers(src_stream
)) != NULL
) {
287 if (extract_names
!= NULL
) {
288 int found_flag
= FALSE
;
289 char *p
= file_entry
->name
;
291 if (p
[0] == '.' && p
[1] == '/')
294 for (i
= 0; extract_names
[i
] != 0; i
++) {
295 if (strcmp(extract_names
[i
], p
) == 0) {
300 if (extract_function
& extract_exclude_list
) {
301 if (found_flag
== TRUE
) {
302 extract_flag
= FALSE
;
305 /* If its not found in the include list dont extract it */
306 if (found_flag
== FALSE
) {
307 extract_flag
= FALSE
;
312 if (extract_flag
== TRUE
) {
313 buffer
= extract_archive(src_stream
, out_stream
,
314 file_entry
, extract_function
,
316 *err
= 0; /* XXX: ignore extraction errors */
318 free_headers(file_entry
);
322 /* seek past the data entry */
323 seek_forward(src_stream
, file_entry
->size
);
325 free_headers(file_entry
);
331 static file_header_t
*get_header_tar(struct gzip_handle
*tar_stream
)
334 unsigned char raw
[512];
336 char name
[100]; /* 0-99 */
337 char mode
[8]; /* 100-107 */
338 char uid
[8]; /* 108-115 */
339 char gid
[8]; /* 116-123 */
340 char size
[12]; /* 124-135 */
341 char mtime
[12]; /* 136-147 */
342 char chksum
[8]; /* 148-155 */
343 char typeflag
; /* 156-156 */
344 char linkname
[100]; /* 157-256 */
345 char magic
[6]; /* 257-262 */
346 char version
[2]; /* 263-264 */
347 char uname
[32]; /* 265-296 */
348 char gname
[32]; /* 297-328 */
349 char devmajor
[8]; /* 329-336 */
350 char devminor
[8]; /* 337-344 */
351 char prefix
[155]; /* 345-499 */
352 char padding
[12]; /* 500-512 */
355 file_header_t
*tar_entry
= NULL
;
359 if (archive_offset
% 512 != 0) {
360 seek_forward(tar_stream
, 512 - (archive_offset
% 512));
363 if (gzip_read(tar_stream
, tar
.raw
, 512) != 512) {
364 /* Unfortunately its common for tar files to have all sorts of
365 * trailing garbage, fail silently */
366 // error_msg("Couldnt read header");
369 archive_offset
+= 512;
371 /* Check header has valid magic, unfortunately some tar files
372 * have empty (0'ed) tar entries at the end, which will
373 * cause this to fail, so fail silently for now
375 if (strncmp(tar
.formated
.magic
, "ustar", 5) != 0) {
376 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
377 if (strncmp(tar
.formated
.magic
, "\0\0\0\0\0", 5) != 0)
382 /* Do checksum on headers */
383 for (i
= 0; i
< 148; i
++) {
387 for (i
= 156; i
< 512; i
++) {
390 if (sum
!= strtol(tar
.formated
.chksum
, NULL
, 8)) {
391 if (strtol(tar
.formated
.chksum
, NULL
, 8) != 0)
392 error_msg("Invalid tar header checksum");
396 /* convert to type'ed variables */
397 tar_entry
= xcalloc(1, sizeof(file_header_t
));
399 // tar_entry->name = xstrdup(tar.formated.name);
402 parse_mode(tar.formated.mode, &tar_entry->mode);
404 tar_entry
->mode
= 07777 & strtol(tar
.formated
.mode
, NULL
, 8);
406 tar_entry
->uid
= strtol(tar
.formated
.uid
, NULL
, 8);
407 tar_entry
->gid
= strtol(tar
.formated
.gid
, NULL
, 8);
408 tar_entry
->size
= strtol(tar
.formated
.size
, NULL
, 8);
409 tar_entry
->mtime
= strtol(tar
.formated
.mtime
, NULL
, 8);
411 tar_entry
->device
= (strtol(tar
.formated
.devmajor
, NULL
, 8) << 8) +
412 strtol(tar
.formated
.devminor
, NULL
, 8);
414 /* Fix mode, used by the old format */
415 switch (tar
.formated
.typeflag
) {
416 /* hard links are detected as regular files with 0 size and a link name */
418 tar_entry
->mode
|= S_IFREG
;
423 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
424 if (last_char_is(tar_entry
->name
, '/')) {
425 tar_entry
->mode
|= S_IFDIR
;
428 tar_entry
->mode
|= S_IFREG
;
431 tar_entry
->mode
|= S_IFLNK
;
434 tar_entry
->mode
|= S_IFCHR
;
437 tar_entry
->mode
|= S_IFBLK
;
440 tar_entry
->mode
|= S_IFDIR
;
443 tar_entry
->mode
|= S_IFIFO
;
445 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
447 longname
= xmalloc(tar_entry
->size
+ 1);
448 if (gzip_read(tar_stream
, longname
, tar_entry
->size
) !=
451 longname
[tar_entry
->size
] = '\0';
452 archive_offset
+= tar_entry
->size
;
454 return (get_header_tar(tar_stream
));
457 linkname
= xmalloc(tar_entry
->size
+ 1);
458 if (gzip_read(tar_stream
, linkname
, tar_entry
->size
) !=
461 linkname
[tar_entry
->size
] = '\0';
462 archive_offset
+= tar_entry
->size
;
464 return (get_header_tar(tar_stream
));
471 perror_msg("Ignoring GNU extension type %c",
472 tar
.formated
.typeflag
);
475 perror_msg("Unknown typeflag: 0x%x", tar
.formated
.typeflag
);
480 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
482 tar_entry
->name
= longname
;
487 tar_entry
->name
= xstrndup(tar
.formated
.name
, 100);
489 if (tar
.formated
.prefix
[0]) {
490 char *temp
= tar_entry
->name
;
491 char *prefixTemp
= xstrndup(tar
.formated
.prefix
, 155);
492 tar_entry
->name
= concat_path_file(prefixTemp
, temp
);
499 tar_entry
->link_name
= linkname
;
502 tar_entry
->link_name
= *tar
.formated
.linkname
!= '\0' ?
503 xstrndup(tar
.formated
.linkname
, 100) : NULL
;
509 static void free_header_tar(file_header_t
* tar_entry
)
511 if (tar_entry
== NULL
)
514 free(tar_entry
->name
);
515 if (tar_entry
->link_name
)
516 free(tar_entry
->link_name
);
521 char *deb_extract(const char *package_filename
, FILE * out_stream
,
522 const int extract_function
, const char *prefix
,
523 const char *filename
, int *err
)
525 FILE *deb_stream
= NULL
;
526 file_header_t
*ar_header
= NULL
;
527 const char **file_list
= NULL
;
528 char *output_buffer
= NULL
;
529 char *ared_file
= NULL
;
532 struct gzip_handle tar_outer
, tar_inner
;
533 file_header_t
*tar_header
;
538 if (filename
!= NULL
) {
539 file_list
= xmalloc(sizeof(char *) * 2);
540 file_list
[0] = filename
;
544 if (extract_function
& extract_control_tar_gz
) {
545 ared_file
= "control.tar.gz";
546 } else if (extract_function
& extract_data_tar_gz
) {
547 ared_file
= "data.tar.gz";
549 opkg_msg(ERROR
, "Internal error: extract_function=%x\n",
555 /* open the debian package to be worked on */
556 deb_stream
= wfopen(package_filename
, "r");
557 if (deb_stream
== NULL
) {
561 /* set the buffer size */
562 setvbuf(deb_stream
, NULL
, _IOFBF
, 0x8000);
564 memset(&tar_outer
, 0, sizeof(tar_outer
));
565 tar_outer
.file
= deb_stream
;
566 gzip_exec(&tar_outer
, NULL
);
568 /* walk through outer tar file to find ared_file */
569 while ((tar_header
= get_header_tar(&tar_outer
)) != NULL
) {
571 if (strncmp(tar_header
->name
, "./", 2) == 0)
574 if (strcmp(ared_file
, tar_header
->name
+ name_offset
) == 0) {
575 memset(&tar_inner
, 0, sizeof(tar_inner
));
576 tar_inner
.gzip
= &tar_outer
;
577 gzip_exec(&tar_inner
, NULL
);
581 output_buffer
= unarchive(&tar_inner
,
586 prefix
, file_list
, err
);
588 free_header_tar(tar_header
);
589 gzip_close(&tar_inner
);
593 seek_forward(&tar_outer
, tar_header
->size
);
594 free_header_tar(tar_header
);
598 gzip_close(&tar_outer
);
603 return output_buffer
;