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.
32 #define CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY 1
33 #define CONFIG_FEATURE_TAR_GNU_EXTENSIONS
35 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
36 static char *longname
= NULL
;
37 static char *linkname
= NULL
;
44 seek_by_read(FILE* fd
, size_t len
)
46 ssize_t cc
, total
= 0;
50 cc
= fread(buf
, sizeof(buf
[0]),
51 len
> SEEK_BUF
? SEEK_BUF
: len
,
57 if(feof(fd
) || ferror(fd
))
64 seek_sub_file(FILE *src_stream
, const int count
)
66 /* Try to fseek as faster */
67 archive_offset
+= count
;
68 seek_by_read(src_stream
, count
);
73 /* Extract the data postioned at src_stream to either filesystem, stdout or
74 * buffer depending on the value of 'function' which is defined in libbb.h
76 * prefix doesnt have to be just a directory, it may prefix the filename as well.
78 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
79 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
80 * 'dpkg.' as their prefix
82 * For this reason if prefix does point to a dir then it must end with a
83 * trailing '/' or else the last dir will be assumed to be the file prefix
86 extract_archive(FILE *src_stream
, FILE *out_stream
,
87 const file_header_t
*file_entry
, const int function
,
91 FILE *dst_stream
= NULL
;
92 char *full_name
= NULL
;
93 char *full_link_name
= NULL
;
99 /* prefix doesnt have to be a proper path it may prepend
100 * the filename as well */
101 if (prefix
!= NULL
) {
102 /* strip leading '/' in filename to extract as prefix may not be dir */
103 /* Cant use concat_path_file here as prefix might not be a directory */
104 char *path
= file_entry
->name
;
105 if (strncmp("./", path
, 2) == 0) {
107 if (strlen(path
) == 0)
108 /* Do nothing, current dir already exists. */
111 full_name
= xmalloc(strlen(prefix
) + strlen(path
) + 1);
112 strcpy(full_name
, prefix
);
113 strcat(full_name
, path
);
114 if ( file_entry
->link_name
){
115 full_link_name
= xmalloc(strlen(prefix
) + strlen(file_entry
->link_name
) + 1);
116 strcpy(full_link_name
, prefix
);
117 strcat(full_link_name
, file_entry
->link_name
);
120 full_name
= xstrdup(file_entry
->name
);
121 if ( file_entry
->link_name
)
122 full_link_name
= xstrdup(file_entry
->link_name
);
126 if (function
& extract_to_stream
) {
127 if (S_ISREG(file_entry
->mode
)) {
128 *err
= copy_file_chunk(src_stream
, out_stream
, file_entry
->size
);
129 archive_offset
+= file_entry
->size
;
132 else if (function
& extract_one_to_buffer
) {
133 if (S_ISREG(file_entry
->mode
)) {
134 buffer
= (char *) xmalloc(file_entry
->size
+ 1);
135 fread(buffer
, 1, file_entry
->size
, src_stream
);
136 buffer
[file_entry
->size
] = '\0';
137 archive_offset
+= file_entry
->size
;
141 else if (function
& extract_all_to_fs
) {
144 stat_res
= lstat (full_name
, &oldfile
);
145 if (stat_res
== 0) { /* The file already exists */
146 if ((function
& extract_unconditional
) || (oldfile
.st_mtime
< file_entry
->mtime
)) {
147 if (!S_ISDIR(oldfile
.st_mode
)) {
148 unlink(full_name
); /* Directories might not be empty etc */
151 if ((function
& extract_quiet
) != extract_quiet
) {
153 error_msg("%s not created: newer or same age file exists", file_entry
->name
);
155 seek_sub_file(src_stream
, file_entry
->size
);
159 if (function
& extract_create_leading_dirs
) { /* Create leading directories with default umask */
161 buf
= xstrdup(full_name
);
162 parent
= dirname(buf
);
163 if (make_directory (parent
, -1, FILEUTILS_RECUR
) != 0) {
164 if ((function
& extract_quiet
) != extract_quiet
) {
166 error_msg("couldn't create leading directories");
171 switch(file_entry
->mode
& S_IFMT
) {
173 if (file_entry
->link_name
) { /* Found a cpio hard link */
174 if (link(full_link_name
, full_name
) != 0) {
175 if ((function
& extract_quiet
) != extract_quiet
) {
177 perror_msg("Cannot link from %s to '%s'",
178 file_entry
->name
, file_entry
->link_name
);
182 if ((dst_stream
= wfopen(full_name
, "w")) == NULL
) {
184 seek_sub_file(src_stream
, file_entry
->size
);
187 archive_offset
+= file_entry
->size
;
188 copy_file_chunk(src_stream
, dst_stream
, file_entry
->size
);
194 if (mkdir(full_name
, file_entry
->mode
) < 0) {
195 if ((function
& extract_quiet
) != extract_quiet
) {
197 perror_msg("%s: %s", __FUNCTION__
, full_name
);
203 if (symlink(file_entry
->link_name
, full_name
) < 0) {
204 if ((function
& extract_quiet
) != extract_quiet
) {
206 perror_msg("Cannot create symlink from %s to '%s'", file_entry
->name
, file_entry
->link_name
);
215 if (mknod(full_name
, file_entry
->mode
, file_entry
->device
) == -1) {
216 if ((function
& extract_quiet
) != extract_quiet
) {
218 perror_msg("Cannot create node %s", file_entry
->name
);
225 perror_msg("Don't know how to handle %s", full_name
);
229 /* Changing a symlink's properties normally changes the properties of the
230 * file pointed to, so dont try and change the date or mode, lchown does
231 * does the right thing, but isnt available in older versions of libc */
232 if (S_ISLNK(file_entry
->mode
)) {
233 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
234 lchown(full_name
, file_entry
->uid
, file_entry
->gid
);
237 if (function
& extract_preserve_date
) {
238 t
.actime
= file_entry
->mtime
;
239 t
.modtime
= file_entry
->mtime
;
240 utime(full_name
, &t
);
242 chown(full_name
, file_entry
->uid
, file_entry
->gid
);
243 chmod(full_name
, file_entry
->mode
);
246 /* If we arent extracting data we have to skip it,
247 * if data size is 0 then then just do it anyway
248 * (saves testing for it) */
249 seek_sub_file(src_stream
, file_entry
->size
);
252 /* extract_list and extract_verbose_list can be used in conjunction
253 * with one of the above four extraction functions, so do this seperately */
254 if (function
& extract_verbose_list
) {
255 fprintf(out_stream
, "%s %d/%d %8d %s ", mode_string(file_entry
->mode
),
256 file_entry
->uid
, file_entry
->gid
,
257 (int) file_entry
->size
, time_string(file_entry
->mtime
));
259 if ((function
& extract_list
) || (function
& extract_verbose_list
)){
260 /* fputs doesnt add a trailing \n, so use fprintf */
261 fprintf(out_stream
, "%s\n", file_entry
->name
);
266 if ( full_link_name
)
267 free(full_link_name
);
273 unarchive(FILE *src_stream
, FILE *out_stream
,
274 file_header_t
*(*get_headers
)(FILE *),
275 void (*free_headers
)(file_header_t
*),
276 const int extract_function
,
278 const char **extract_names
,
281 file_header_t
*file_entry
;
289 while ((file_entry
= get_headers(src_stream
)) != NULL
) {
292 if (extract_names
!= NULL
) {
293 int found_flag
= FALSE
;
294 for(i
= 0; extract_names
[i
] != 0; i
++) {
295 if (strcmp(extract_names
[i
], file_entry
->name
) == 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
,
317 free_headers(file_entry
);
321 /* seek past the data entry */
322 seek_sub_file(src_stream
, file_entry
->size
);
324 free_headers(file_entry
);
330 static file_header_t
*
331 get_header_ar(FILE *src_stream
)
333 file_header_t
*typed
;
346 static char *ar_long_names
;
348 if (fread(ar
.raw
, 1, 60, src_stream
) != 60) {
351 archive_offset
+= 60;
352 /* align the headers based on the header magic */
353 if ((ar
.formated
.magic
[0] != '`') || (ar
.formated
.magic
[1] != '\n')) {
354 /* some version of ar, have an extra '\n' after each data entry,
355 * this puts the next header out by 1 */
356 if (ar
.formated
.magic
[1] != '`') {
357 error_msg("Invalid magic");
360 /* read the next char out of what would be the data section,
361 * if its a '\n' then it is a valid header offset by 1*/
363 if (fgetc(src_stream
) != '\n') {
364 error_msg("Invalid magic");
367 /* fix up the header, we started reading 1 byte too early */
368 /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
369 memmove(ar
.raw
, &ar
.raw
[1], 59);
372 typed
= (file_header_t
*) xcalloc(1, sizeof(file_header_t
));
374 typed
->size
= (size_t) atoi(ar
.formated
.size
);
375 /* long filenames have '/' as the first character */
376 if (ar
.formated
.name
[0] == '/') {
377 if (ar
.formated
.name
[1] == '/') {
378 /* If the second char is a '/' then this entries data section
379 * stores long filename for multiple entries, they are stored
380 * in static variable long_names for use in future entries */
381 ar_long_names
= (char *) xrealloc(ar_long_names
, typed
->size
);
382 fread(ar_long_names
, 1, typed
->size
, src_stream
);
383 archive_offset
+= typed
->size
;
384 /* This ar entries data section only contained filenames for other records
385 * they are stored in the static ar_long_names for future reference */
386 return (get_header_ar(src_stream
)); /* Return next header */
387 } else if (ar
.formated
.name
[1] == ' ') {
388 /* This is the index of symbols in the file for compilers */
389 seek_sub_file(src_stream
, typed
->size
);
390 return (get_header_ar(src_stream
)); /* Return next header */
392 /* The number after the '/' indicates the offset in the ar data section
393 (saved in variable long_name) that conatains the real filename */
394 if (!ar_long_names
) {
395 error_msg("Cannot resolve long file name");
398 typed
->name
= xstrdup(ar_long_names
+ atoi(&ar
.formated
.name
[1]));
401 /* short filenames */
402 typed
->name
= xcalloc(1, 16);
403 strncpy(typed
->name
, ar
.formated
.name
, 16);
405 typed
->name
[strcspn(typed
->name
, " /")]='\0';
407 /* convert the rest of the now valid char header to its typed struct */
408 parse_mode(ar
.formated
.mode
, &typed
->mode
);
409 typed
->mtime
= atoi(ar
.formated
.date
);
410 typed
->uid
= atoi(ar
.formated
.uid
);
411 typed
->gid
= atoi(ar
.formated
.gid
);
417 free_header_ar(file_header_t
*ar_entry
)
419 if (ar_entry
== NULL
)
422 free(ar_entry
->name
);
423 if (ar_entry
->link_name
)
424 free(ar_entry
->link_name
);
430 static file_header_t
*
431 get_header_tar(FILE *tar_stream
)
434 unsigned char raw
[512];
436 char name
[100]; /* 0-99 */
437 char mode
[8]; /* 100-107 */
438 char uid
[8]; /* 108-115 */
439 char gid
[8]; /* 116-123 */
440 char size
[12]; /* 124-135 */
441 char mtime
[12]; /* 136-147 */
442 char chksum
[8]; /* 148-155 */
443 char typeflag
; /* 156-156 */
444 char linkname
[100]; /* 157-256 */
445 char magic
[6]; /* 257-262 */
446 char version
[2]; /* 263-264 */
447 char uname
[32]; /* 265-296 */
448 char gname
[32]; /* 297-328 */
449 char devmajor
[8]; /* 329-336 */
450 char devminor
[8]; /* 337-344 */
451 char prefix
[155]; /* 345-499 */
452 char padding
[12]; /* 500-512 */
455 file_header_t
*tar_entry
= NULL
;
459 if (archive_offset
% 512 != 0) {
460 seek_sub_file(tar_stream
, 512 - (archive_offset
% 512));
463 if (fread(tar
.raw
, 1, 512, tar_stream
) != 512) {
464 /* Unfortunatly its common for tar files to have all sorts of
465 * trailing garbage, fail silently */
466 // error_msg("Couldnt read header");
469 archive_offset
+= 512;
471 /* Check header has valid magic, unfortunately some tar files
472 * have empty (0'ed) tar entries at the end, which will
473 * cause this to fail, so fail silently for now
475 if (strncmp(tar
.formated
.magic
, "ustar", 5) != 0) {
476 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
477 if (strncmp(tar
.formated
.magic
, "\0\0\0\0\0", 5) != 0)
482 /* Do checksum on headers */
483 for (i
= 0; i
< 148 ; i
++) {
487 for (i
= 156; i
< 512 ; i
++) {
490 if (sum
!= strtol(tar
.formated
.chksum
, NULL
, 8)) {
491 if ( strtol(tar
.formated
.chksum
,NULL
,8) != 0 )
492 error_msg("Invalid tar header checksum");
496 /* convert to type'ed variables */
497 tar_entry
= xcalloc(1, sizeof(file_header_t
));
499 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
501 tar_entry
->name
= longname
;
505 tar_entry
->name
= linkname
;
510 tar_entry
->name
= xstrndup(tar
.formated
.name
, 100);
512 if (tar
.formated
.prefix
[0]) {
513 char *temp
= tar_entry
->name
;
514 char *prefixTemp
= xstrndup(tar
.formated
.prefix
, 155);
515 tar_entry
->name
= concat_path_file(prefixTemp
, temp
);
521 // tar_entry->name = xstrdup(tar.formated.name);
524 parse_mode(tar.formated.mode, &tar_entry->mode);
526 tar_entry
->mode
= 07777 & strtol(tar
.formated
.mode
, NULL
, 8);
528 tar_entry
->uid
= strtol(tar
.formated
.uid
, NULL
, 8);
529 tar_entry
->gid
= strtol(tar
.formated
.gid
, NULL
, 8);
530 tar_entry
->size
= strtol(tar
.formated
.size
, NULL
, 8);
531 tar_entry
->mtime
= strtol(tar
.formated
.mtime
, NULL
, 8);
532 tar_entry
->link_name
= *tar
.formated
.linkname
!= '\0' ? xstrndup(tar
.formated
.linkname
, 100) : NULL
;
533 tar_entry
->device
= (strtol(tar
.formated
.devmajor
, NULL
, 8) << 8) +
534 strtol(tar
.formated
.devminor
, NULL
, 8);
536 /* Fix mode, used by the old format */
537 switch (tar
.formated
.typeflag
) {
538 /* hard links are detected as regular files with 0 size and a link name */
540 tar_entry
->mode
|= S_IFREG
;
545 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
546 if (last_char_is(tar_entry
->name
, '/')) {
547 tar_entry
->mode
|= S_IFDIR
;
550 tar_entry
->mode
|= S_IFREG
;
553 tar_entry
->mode
|= S_IFLNK
;
556 tar_entry
->mode
|= S_IFCHR
;
559 tar_entry
->mode
|= S_IFBLK
;
562 tar_entry
->mode
|= S_IFDIR
;
565 tar_entry
->mode
|= S_IFIFO
;
567 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
569 longname
= xmalloc(tar_entry
->size
+ 1);
570 if(fread(longname
, tar_entry
->size
, 1, tar_stream
) != 1)
572 longname
[tar_entry
->size
] = '\0';
573 archive_offset
+= tar_entry
->size
;
575 return(get_header_tar(tar_stream
));
578 linkname
= xmalloc(tar_entry
->size
+ 1);
579 if(fread(linkname
, tar_entry
->size
, 1, tar_stream
) != 1)
581 linkname
[tar_entry
->size
] = '\0';
582 archive_offset
+= tar_entry
->size
;
584 tar_entry
->name
= linkname
;
585 return(get_header_tar(tar_stream
));
592 perror_msg("Ignoring GNU extension type %c", tar
.formated
.typeflag
);
595 perror_msg("Unknown typeflag: 0x%x", tar
.formated
.typeflag
);
604 free_header_tar(file_header_t
*tar_entry
)
606 if (tar_entry
== NULL
)
609 free(tar_entry
->name
);
610 if (tar_entry
->link_name
);
611 free(tar_entry
->link_name
);
617 deb_extract(const char *package_filename
, FILE *out_stream
,
618 const int extract_function
, const char *prefix
,
619 const char *filename
, int *err
)
621 FILE *deb_stream
= NULL
;
622 file_header_t
*ar_header
= NULL
;
623 const char **file_list
= NULL
;
624 char *output_buffer
= NULL
;
625 char *ared_file
= NULL
;
630 if (filename
!= NULL
) {
631 file_list
= xmalloc(sizeof(char *) * 2);
632 file_list
[0] = filename
;
636 if (extract_function
& extract_control_tar_gz
) {
637 ared_file
= "control.tar.gz";
639 else if (extract_function
& extract_data_tar_gz
) {
640 ared_file
= "data.tar.gz";
642 fprintf(stderr
, "no file specified to extract -- extract_function=%x\n", extract_function
);
647 /* open the debian package to be worked on */
648 deb_stream
= wfopen(package_filename
, "r");
649 if (deb_stream
== NULL
) {
653 /* set the buffer size */
654 setvbuf(deb_stream
, NULL
, _IOFBF
, 0x8000);
657 fread(ar_magic
, 1, 8, deb_stream
);
659 if (strncmp(ar_magic
,"!<arch>",7) == 0) {
662 while ((ar_header
= get_header_ar(deb_stream
)) != NULL
) {
663 if (strcmp(ared_file
, ar_header
->name
) == 0) {
665 FILE *uncompressed_stream
;
666 /* open a stream of decompressed data */
667 uncompressed_stream
= gz_open(deb_stream
, &gunzip_pid
);
668 if (uncompressed_stream
== NULL
) {
669 printf("%s: %d\n", __FUNCTION__
, __LINE__
);
675 output_buffer
= unarchive(uncompressed_stream
,
676 out_stream
, get_header_tar
,
678 extract_function
, prefix
,
680 fclose(uncompressed_stream
);
681 gz_close(gunzip_pid
);
682 free_header_ar(ar_header
);
685 seek_sub_file(deb_stream
, ar_header
->size
);
686 free_header_ar(ar_header
);
689 } else if (strncmp(ar_magic
, "\037\213", 2) == 0) {
690 /* it's a gz file, let's assume it's an opkg */
691 int unzipped_opkg_pid
;
692 FILE *unzipped_opkg_stream
;
693 file_header_t
*tar_header
;
695 fseek(deb_stream
, 0, SEEK_SET
);
696 unzipped_opkg_stream
= gz_open(deb_stream
, &unzipped_opkg_pid
);
697 if (unzipped_opkg_stream
== NULL
) {
702 /* walk through outer tar file to find ared_file */
703 while ((tar_header
= get_header_tar(unzipped_opkg_stream
)) != NULL
) {
705 if (strncmp(tar_header
->name
, "./", 2) == 0)
707 if (strcmp(ared_file
, tar_header
->name
+name_offset
) == 0) {
709 FILE *uncompressed_stream
;
710 /* open a stream of decompressed data */
711 uncompressed_stream
= gz_open(unzipped_opkg_stream
, &gunzip_pid
);
712 if (uncompressed_stream
== NULL
) {
718 output_buffer
= unarchive(uncompressed_stream
,
727 free_header_tar(tar_header
);
728 fclose(uncompressed_stream
);
729 gz_close(gunzip_pid
);
730 free_header_tar(tar_header
);
733 seek_sub_file(unzipped_opkg_stream
, tar_header
->size
);
734 free_header_tar(tar_header
);
736 fclose(unzipped_opkg_stream
);
737 gz_close(unzipped_opkg_pid
);
742 error_msg("%s: invalid magic", package_filename
);
751 return output_buffer
;