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
;
44 seek_forward(struct gzip_handle
*zh
, ssize_t len
)
46 ssize_t slen
= gzip_seek(zh
, len
);
49 archive_offset
+= len
;
55 /* Extract the data postioned at src_stream to either filesystem, stdout or
56 * buffer depending on the value of 'function' which is defined in libbb.h
58 * prefix doesnt have to be just a directory, it may prefix the filename as well.
60 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
61 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
62 * 'dpkg.' as their prefix
64 * For this reason if prefix does point to a dir then it must end with a
65 * trailing '/' or else the last dir will be assumed to be the file prefix
68 extract_archive(struct gzip_handle
*src_stream
, FILE *out_stream
,
69 const file_header_t
*file_entry
, const int function
,
73 FILE *dst_stream
= NULL
;
74 char *full_name
= NULL
;
75 char *full_link_name
= NULL
;
81 /* prefix doesnt have to be a proper path it may prepend
82 * the filename as well */
84 /* strip leading '/' in filename to extract as prefix may not be dir */
85 /* Cant use concat_path_file here as prefix might not be a directory */
86 char *path
= file_entry
->name
;
87 if (strncmp("./", path
, 2) == 0) {
89 if (strlen(path
) == 0)
90 /* Do nothing, current dir already exists. */
93 full_name
= xmalloc(strlen(prefix
) + strlen(path
) + 1);
94 strcpy(full_name
, prefix
);
95 strcat(full_name
, path
);
96 if ( file_entry
->link_name
){
97 full_link_name
= xmalloc(strlen(prefix
) + strlen(file_entry
->link_name
) + 1);
98 strcpy(full_link_name
, prefix
);
99 strcat(full_link_name
, file_entry
->link_name
);
102 full_name
= xstrdup(file_entry
->name
);
103 if ( file_entry
->link_name
)
104 full_link_name
= xstrdup(file_entry
->link_name
);
108 if (function
& extract_to_stream
) {
109 if (S_ISREG(file_entry
->mode
)) {
110 *err
= gzip_copy(src_stream
, out_stream
, file_entry
->size
);
111 archive_offset
+= file_entry
->size
;
114 else if (function
& extract_one_to_buffer
) {
115 if (S_ISREG(file_entry
->mode
)) {
116 buffer
= (char *) xmalloc(file_entry
->size
+ 1);
117 gzip_read(src_stream
, buffer
, file_entry
->size
);
118 buffer
[file_entry
->size
] = '\0';
119 archive_offset
+= file_entry
->size
;
123 else if (function
& extract_all_to_fs
) {
126 stat_res
= lstat (full_name
, &oldfile
);
127 if (stat_res
== 0) { /* The file already exists */
128 if ((function
& extract_unconditional
) || (oldfile
.st_mtime
< file_entry
->mtime
)) {
129 if (!S_ISDIR(oldfile
.st_mode
)) {
130 unlink(full_name
); /* Directories might not be empty etc */
133 if ((function
& extract_quiet
) != extract_quiet
) {
135 error_msg("%s not created: newer or same age file exists", file_entry
->name
);
137 seek_forward(src_stream
, file_entry
->size
);
141 if (function
& extract_create_leading_dirs
) { /* Create leading directories with default umask */
143 buf
= xstrdup(full_name
);
144 parent
= dirname(buf
);
145 if (make_directory (parent
, -1, FILEUTILS_RECUR
) != 0) {
146 if ((function
& extract_quiet
) != extract_quiet
) {
148 error_msg("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
) != extract_quiet
) {
159 perror_msg("Cannot link from %s to '%s'",
160 file_entry
->name
, file_entry
->link_name
);
164 if ((dst_stream
= wfopen(full_name
, "w")) == NULL
) {
166 seek_forward(src_stream
, file_entry
->size
);
169 archive_offset
+= file_entry
->size
;
170 *err
= gzip_copy(src_stream
, dst_stream
, file_entry
->size
);
176 if (mkdir(full_name
, file_entry
->mode
) < 0) {
177 if ((function
& extract_quiet
) != extract_quiet
) {
179 perror_msg("Cannot make dir %s", full_name
);
185 if (symlink(file_entry
->link_name
, full_name
) < 0) {
186 if ((function
& extract_quiet
) != extract_quiet
) {
188 perror_msg("Cannot create symlink from %s to '%s'", file_entry
->name
, file_entry
->link_name
);
197 if (mknod(full_name
, file_entry
->mode
, file_entry
->device
) == -1) {
198 if ((function
& extract_quiet
) != extract_quiet
) {
200 perror_msg("Cannot create node %s", file_entry
->name
);
207 perror_msg("Don't know how to handle %s", full_name
);
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
);
219 if (function
& extract_preserve_date
) {
220 t
.actime
= file_entry
->mtime
;
221 t
.modtime
= file_entry
->mtime
;
222 utime(full_name
, &t
);
224 chown(full_name
, file_entry
->uid
, file_entry
->gid
);
225 chmod(full_name
, file_entry
->mode
);
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_forward(src_stream
, file_entry
->size
);
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
));
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
);
248 if ( full_link_name
)
249 free(full_link_name
);
255 unarchive(struct gzip_handle
*src_stream
, FILE *out_stream
,
256 file_header_t
*(*get_headers
)(struct gzip_handle
*),
257 void (*free_headers
)(file_header_t
*),
258 const int extract_function
,
260 const char **extract_names
,
263 file_header_t
*file_entry
;
271 while ((file_entry
= get_headers(src_stream
)) != NULL
) {
274 if (extract_names
!= NULL
) {
275 int found_flag
= FALSE
;
276 char *p
= file_entry
->name
;
278 if (p
[0] == '.' && p
[1] == '/')
281 for(i
= 0; extract_names
[i
] != 0; i
++) {
282 if (strcmp(extract_names
[i
], p
) == 0) {
287 if (extract_function
& extract_exclude_list
) {
288 if (found_flag
== TRUE
) {
289 extract_flag
= FALSE
;
292 /* If its not found in the include list dont extract it */
293 if (found_flag
== FALSE
) {
294 extract_flag
= FALSE
;
299 if (extract_flag
== TRUE
) {
300 buffer
= extract_archive(src_stream
, out_stream
,
301 file_entry
, extract_function
,
303 *err
= 0; /* XXX: ignore extraction errors */
305 free_headers(file_entry
);
309 /* seek past the data entry */
310 seek_forward(src_stream
, file_entry
->size
);
312 free_headers(file_entry
);
319 static file_header_t
*
320 get_header_tar(struct gzip_handle
*tar_stream
)
323 unsigned char raw
[512];
325 char name
[100]; /* 0-99 */
326 char mode
[8]; /* 100-107 */
327 char uid
[8]; /* 108-115 */
328 char gid
[8]; /* 116-123 */
329 char size
[12]; /* 124-135 */
330 char mtime
[12]; /* 136-147 */
331 char chksum
[8]; /* 148-155 */
332 char typeflag
; /* 156-156 */
333 char linkname
[100]; /* 157-256 */
334 char magic
[6]; /* 257-262 */
335 char version
[2]; /* 263-264 */
336 char uname
[32]; /* 265-296 */
337 char gname
[32]; /* 297-328 */
338 char devmajor
[8]; /* 329-336 */
339 char devminor
[8]; /* 337-344 */
340 char prefix
[155]; /* 345-499 */
341 char padding
[12]; /* 500-512 */
344 file_header_t
*tar_entry
= NULL
;
348 if (archive_offset
% 512 != 0) {
349 seek_forward(tar_stream
, 512 - (archive_offset
% 512));
352 if (gzip_read(tar_stream
, tar
.raw
, 512) != 512) {
353 /* Unfortunately its common for tar files to have all sorts of
354 * trailing garbage, fail silently */
355 // error_msg("Couldnt read header");
358 archive_offset
+= 512;
360 /* Check header has valid magic, unfortunately some tar files
361 * have empty (0'ed) tar entries at the end, which will
362 * cause this to fail, so fail silently for now
364 if (strncmp(tar
.formated
.magic
, "ustar", 5) != 0) {
365 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
366 if (strncmp(tar
.formated
.magic
, "\0\0\0\0\0", 5) != 0)
371 /* Do checksum on headers */
372 for (i
= 0; i
< 148 ; i
++) {
376 for (i
= 156; i
< 512 ; i
++) {
379 if (sum
!= strtol(tar
.formated
.chksum
, NULL
, 8)) {
380 if ( strtol(tar
.formated
.chksum
,NULL
,8) != 0 )
381 error_msg("Invalid tar header checksum");
385 /* convert to type'ed variables */
386 tar_entry
= xcalloc(1, sizeof(file_header_t
));
390 // tar_entry->name = xstrdup(tar.formated.name);
393 parse_mode(tar.formated.mode, &tar_entry->mode);
395 tar_entry
->mode
= 07777 & strtol(tar
.formated
.mode
, NULL
, 8);
397 tar_entry
->uid
= strtol(tar
.formated
.uid
, NULL
, 8);
398 tar_entry
->gid
= strtol(tar
.formated
.gid
, NULL
, 8);
399 tar_entry
->size
= strtol(tar
.formated
.size
, NULL
, 8);
400 tar_entry
->mtime
= strtol(tar
.formated
.mtime
, NULL
, 8);
402 tar_entry
->device
= (strtol(tar
.formated
.devmajor
, NULL
, 8) << 8) +
403 strtol(tar
.formated
.devminor
, NULL
, 8);
405 /* Fix mode, used by the old format */
406 switch (tar
.formated
.typeflag
) {
407 /* hard links are detected as regular files with 0 size and a link name */
409 tar_entry
->mode
|= S_IFREG
;
414 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
415 if (last_char_is(tar_entry
->name
, '/')) {
416 tar_entry
->mode
|= S_IFDIR
;
419 tar_entry
->mode
|= S_IFREG
;
422 tar_entry
->mode
|= S_IFLNK
;
425 tar_entry
->mode
|= S_IFCHR
;
428 tar_entry
->mode
|= S_IFBLK
;
431 tar_entry
->mode
|= S_IFDIR
;
434 tar_entry
->mode
|= S_IFIFO
;
436 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
438 longname
= xmalloc(tar_entry
->size
+ 1);
439 if(gzip_read(tar_stream
, longname
, tar_entry
->size
) != tar_entry
->size
)
441 longname
[tar_entry
->size
] = '\0';
442 archive_offset
+= tar_entry
->size
;
444 return(get_header_tar(tar_stream
));
447 linkname
= xmalloc(tar_entry
->size
+ 1);
448 if(gzip_read(tar_stream
, linkname
, tar_entry
->size
) != tar_entry
->size
)
450 linkname
[tar_entry
->size
] = '\0';
451 archive_offset
+= tar_entry
->size
;
453 return(get_header_tar(tar_stream
));
460 perror_msg("Ignoring GNU extension type %c", tar
.formated
.typeflag
);
463 perror_msg("Unknown typeflag: 0x%x", tar
.formated
.typeflag
);
469 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
471 tar_entry
->name
= longname
;
476 tar_entry
->name
= xstrndup(tar
.formated
.name
, 100);
478 if (tar
.formated
.prefix
[0]) {
479 char *temp
= tar_entry
->name
;
480 char *prefixTemp
= xstrndup(tar
.formated
.prefix
, 155);
481 tar_entry
->name
= concat_path_file(prefixTemp
, temp
);
488 tar_entry
->link_name
= linkname
;
492 tar_entry
->link_name
= *tar
.formated
.linkname
!= '\0' ?
493 xstrndup(tar
.formated
.linkname
, 100) : NULL
;
500 free_header_tar(file_header_t
*tar_entry
)
502 if (tar_entry
== NULL
)
505 free(tar_entry
->name
);
506 if (tar_entry
->link_name
)
507 free(tar_entry
->link_name
);
513 deb_extract(const char *package_filename
, FILE *out_stream
,
514 const int extract_function
, const char *prefix
,
515 const char *filename
, int *err
)
517 FILE *deb_stream
= NULL
;
518 file_header_t
*ar_header
= NULL
;
519 const char **file_list
= NULL
;
520 char *output_buffer
= NULL
;
521 char *ared_file
= NULL
;
524 struct gzip_handle tar_outer
, tar_inner
;
525 file_header_t
*tar_header
;
530 if (filename
!= NULL
) {
531 file_list
= xmalloc(sizeof(char *) * 2);
532 file_list
[0] = filename
;
536 if (extract_function
& extract_control_tar_gz
) {
537 ared_file
= "control.tar.gz";
539 else if (extract_function
& extract_data_tar_gz
) {
540 ared_file
= "data.tar.gz";
542 opkg_msg(ERROR
, "Internal error: extract_function=%x\n",
548 /* open the debian package to be worked on */
549 deb_stream
= wfopen(package_filename
, "r");
550 if (deb_stream
== NULL
) {
554 /* set the buffer size */
555 setvbuf(deb_stream
, NULL
, _IOFBF
, 0x8000);
557 memset(&tar_outer
, 0, sizeof(tar_outer
));
558 tar_outer
.file
= deb_stream
;
559 gzip_exec(&tar_outer
, NULL
);
561 /* walk through outer tar file to find ared_file */
562 while ((tar_header
= get_header_tar(&tar_outer
)) != NULL
) {
564 if (strncmp(tar_header
->name
, "./", 2) == 0)
567 if (strcmp(ared_file
, tar_header
->name
+name_offset
) == 0) {
568 memset(&tar_inner
, 0, sizeof(tar_inner
));
569 tar_inner
.gzip
= &tar_outer
;
570 gzip_exec(&tar_inner
, NULL
);
574 output_buffer
= unarchive(&tar_inner
,
583 free_header_tar(tar_header
);
584 gzip_close(&tar_inner
);
588 seek_forward(&tar_outer
, tar_header
->size
);
589 free_header_tar(tar_header
);
593 gzip_close(&tar_outer
);
598 return output_buffer
;