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
,
90 FILE *dst_stream
= NULL
;
91 char *full_name
= NULL
;
92 char *full_link_name
= NULL
;
97 /* prefix doesnt have to be a proper path it may prepend
98 * the filename as well */
100 /* strip leading '/' in filename to extract as prefix may not be dir */
101 /* Cant use concat_path_file here as prefix might not be a directory */
102 char *path
= file_entry
->name
;
103 if (strncmp("./", path
, 2) == 0) {
105 if (strlen(path
) == 0) {
109 full_name
= xmalloc(strlen(prefix
) + strlen(path
) + 1);
110 strcpy(full_name
, prefix
);
111 strcat(full_name
, path
);
112 if ( file_entry
->link_name
){
113 full_link_name
= xmalloc(strlen(prefix
) + strlen(file_entry
->link_name
) + 1);
114 strcpy(full_link_name
, prefix
);
115 strcat(full_link_name
, file_entry
->link_name
);
118 full_name
= xstrdup(file_entry
->name
);
119 if ( file_entry
->link_name
)
120 full_link_name
= xstrdup(file_entry
->link_name
);
124 if (function
& extract_to_stdout
) {
125 if (S_ISREG(file_entry
->mode
)) {
126 copy_file_chunk(src_stream
, out_stream
, file_entry
->size
);
127 archive_offset
+= file_entry
->size
;
130 else if (function
& extract_one_to_buffer
) {
131 if (S_ISREG(file_entry
->mode
)) {
132 buffer
= (char *) xmalloc(file_entry
->size
+ 1);
133 fread(buffer
, 1, file_entry
->size
, src_stream
);
134 buffer
[file_entry
->size
] = '\0';
135 archive_offset
+= file_entry
->size
;
139 else if (function
& extract_all_to_fs
) {
142 stat_res
= lstat (full_name
, &oldfile
);
143 if (stat_res
== 0) { /* The file already exists */
144 if ((function
& extract_unconditional
) || (oldfile
.st_mtime
< file_entry
->mtime
)) {
145 if (!S_ISDIR(oldfile
.st_mode
)) {
146 unlink(full_name
); /* Directories might not be empty etc */
149 if ((function
& extract_quiet
) != extract_quiet
) {
150 error_msg("%s not created: newer or same age file exists", file_entry
->name
);
152 seek_sub_file(src_stream
, file_entry
->size
);
156 if (function
& extract_create_leading_dirs
) { /* Create leading directories with default umask */
158 buf
= xstrdup(full_name
);
159 parent
= dirname(buf
);
160 if (make_directory (parent
, -1, FILEUTILS_RECUR
) != 0) {
161 if ((function
& extract_quiet
) != extract_quiet
) {
162 error_msg("couldn't create leading directories");
167 switch(file_entry
->mode
& S_IFMT
) {
169 if (file_entry
->link_name
) { /* Found a cpio hard link */
170 if (link(full_link_name
, full_name
) != 0) {
171 if ((function
& extract_quiet
) != extract_quiet
) {
172 perror_msg("Cannot link from %s to '%s'",
173 file_entry
->name
, file_entry
->link_name
);
177 if ((dst_stream
= wfopen(full_name
, "w")) == NULL
) {
178 seek_sub_file(src_stream
, file_entry
->size
);
181 archive_offset
+= file_entry
->size
;
182 copy_file_chunk(src_stream
, dst_stream
, file_entry
->size
);
188 if (mkdir(full_name
, file_entry
->mode
) < 0) {
189 if ((function
& extract_quiet
) != extract_quiet
) {
190 perror_msg("extract_archive: %s", full_name
);
196 if (symlink(file_entry
->link_name
, full_name
) < 0) {
197 if ((function
& extract_quiet
) != extract_quiet
) {
198 perror_msg("Cannot create symlink from %s to '%s'", file_entry
->name
, file_entry
->link_name
);
207 if (mknod(full_name
, file_entry
->mode
, file_entry
->device
) == -1) {
208 if ((function
& extract_quiet
) != extract_quiet
) {
209 perror_msg("Cannot create node %s", file_entry
->name
);
215 perror_msg("Don't know how to handle %s", full_name
);
219 /* Changing a symlink's properties normally changes the properties of the
220 * file pointed to, so dont try and change the date or mode, lchown does
221 * does the right thing, but isnt available in older versions of libc */
222 if (S_ISLNK(file_entry
->mode
)) {
223 #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
224 lchown(full_name
, file_entry
->uid
, file_entry
->gid
);
227 if (function
& extract_preserve_date
) {
228 t
.actime
= file_entry
->mtime
;
229 t
.modtime
= file_entry
->mtime
;
230 utime(full_name
, &t
);
232 chown(full_name
, file_entry
->uid
, file_entry
->gid
);
233 chmod(full_name
, file_entry
->mode
);
236 /* If we arent extracting data we have to skip it,
237 * if data size is 0 then then just do it anyway
238 * (saves testing for it) */
239 seek_sub_file(src_stream
, file_entry
->size
);
242 /* extract_list and extract_verbose_list can be used in conjunction
243 * with one of the above four extraction functions, so do this seperately */
244 if (function
& extract_verbose_list
) {
245 fprintf(out_stream
, "%s %d/%d %8d %s ", mode_string(file_entry
->mode
),
246 file_entry
->uid
, file_entry
->gid
,
247 (int) file_entry
->size
, time_string(file_entry
->mtime
));
249 if ((function
& extract_list
) || (function
& extract_verbose_list
)){
250 /* fputs doesnt add a trailing \n, so use fprintf */
251 fprintf(out_stream
, "%s\n", file_entry
->name
);
256 if ( full_link_name
)
257 free(full_link_name
);
259 return(buffer
); /* Maybe we should say if failed */
263 unarchive(FILE *src_stream
, FILE *out_stream
,
264 file_header_t
*(*get_headers
)(FILE *),
265 void (*free_headers
)(file_header_t
*),
266 const int extract_function
,
268 const char **extract_names
)
270 file_header_t
*file_entry
;
276 while ((file_entry
= get_headers(src_stream
)) != NULL
) {
278 /* fprintf(stderr, __FUNCTION__ " getting headers\n"); */
279 if (extract_names
!= NULL
) {
280 int found_flag
= FALSE
;
281 for(i
= 0; extract_names
[i
] != 0; i
++) {
282 if (strcmp(extract_names
[i
], file_entry
->name
) == 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
;
300 if (extract_flag
== TRUE
) {
301 /* fprintf(stderr, __FUNCTION__ " extract?\n"); */
302 buffer
= extract_archive(src_stream
, out_stream
, file_entry
, extract_function
, prefix
);
303 /* fprintf(stderr, __FUNCTION__ " extracted\n"); */
305 /* seek past the data entry */
306 seek_sub_file(src_stream
, file_entry
->size
);
308 free_headers(file_entry
);
310 /*fprintf(stderr, __FUNCTION__ " goin home\n");*/
315 static file_header_t
*
316 get_header_ar(FILE *src_stream
)
318 file_header_t
*typed
;
331 static char *ar_long_names
;
333 if (fread(ar
.raw
, 1, 60, src_stream
) != 60) {
336 archive_offset
+= 60;
337 /* align the headers based on the header magic */
338 if ((ar
.formated
.magic
[0] != '`') || (ar
.formated
.magic
[1] != '\n')) {
339 /* some version of ar, have an extra '\n' after each data entry,
340 * this puts the next header out by 1 */
341 if (ar
.formated
.magic
[1] != '`') {
342 error_msg("Invalid magic");
345 /* read the next char out of what would be the data section,
346 * if its a '\n' then it is a valid header offset by 1*/
348 if (fgetc(src_stream
) != '\n') {
349 error_msg("Invalid magic");
352 /* fix up the header, we started reading 1 byte too early */
353 /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
354 memmove(ar
.raw
, &ar
.raw
[1], 59);
357 typed
= (file_header_t
*) xcalloc(1, sizeof(file_header_t
));
359 typed
->size
= (size_t) atoi(ar
.formated
.size
);
360 /* long filenames have '/' as the first character */
361 if (ar
.formated
.name
[0] == '/') {
362 if (ar
.formated
.name
[1] == '/') {
363 /* If the second char is a '/' then this entries data section
364 * stores long filename for multiple entries, they are stored
365 * in static variable long_names for use in future entries */
366 ar_long_names
= (char *) xrealloc(ar_long_names
, typed
->size
);
367 fread(ar_long_names
, 1, typed
->size
, src_stream
);
368 archive_offset
+= typed
->size
;
369 /* This ar entries data section only contained filenames for other records
370 * they are stored in the static ar_long_names for future reference */
371 return (get_header_ar(src_stream
)); /* Return next header */
372 } else if (ar
.formated
.name
[1] == ' ') {
373 /* This is the index of symbols in the file for compilers */
374 seek_sub_file(src_stream
, typed
->size
);
375 return (get_header_ar(src_stream
)); /* Return next header */
377 /* The number after the '/' indicates the offset in the ar data section
378 (saved in variable long_name) that conatains the real filename */
379 if (!ar_long_names
) {
380 error_msg("Cannot resolve long file name");
383 typed
->name
= xstrdup(ar_long_names
+ atoi(&ar
.formated
.name
[1]));
386 /* short filenames */
387 typed
->name
= xcalloc(1, 16);
388 strncpy(typed
->name
, ar
.formated
.name
, 16);
390 typed
->name
[strcspn(typed
->name
, " /")]='\0';
392 /* convert the rest of the now valid char header to its typed struct */
393 parse_mode(ar
.formated
.mode
, &typed
->mode
);
394 typed
->mtime
= atoi(ar
.formated
.date
);
395 typed
->uid
= atoi(ar
.formated
.uid
);
396 typed
->gid
= atoi(ar
.formated
.gid
);
402 free_header_ar(file_header_t
*ar_entry
)
404 if (ar_entry
== NULL
)
407 free(ar_entry
->name
);
408 if (ar_entry
->link_name
)
409 free(ar_entry
->link_name
);
415 static file_header_t
*
416 get_header_tar(FILE *tar_stream
)
419 unsigned char raw
[512];
421 char name
[100]; /* 0-99 */
422 char mode
[8]; /* 100-107 */
423 char uid
[8]; /* 108-115 */
424 char gid
[8]; /* 116-123 */
425 char size
[12]; /* 124-135 */
426 char mtime
[12]; /* 136-147 */
427 char chksum
[8]; /* 148-155 */
428 char typeflag
; /* 156-156 */
429 char linkname
[100]; /* 157-256 */
430 char magic
[6]; /* 257-262 */
431 char version
[2]; /* 263-264 */
432 char uname
[32]; /* 265-296 */
433 char gname
[32]; /* 297-328 */
434 char devmajor
[8]; /* 329-336 */
435 char devminor
[8]; /* 337-344 */
436 char prefix
[155]; /* 345-499 */
437 char padding
[12]; /* 500-512 */
440 file_header_t
*tar_entry
= NULL
;
444 if (archive_offset
% 512 != 0) {
445 seek_sub_file(tar_stream
, 512 - (archive_offset
% 512));
448 if (fread(tar
.raw
, 1, 512, tar_stream
) != 512) {
449 /* Unfortunatly its common for tar files to have all sorts of
450 * trailing garbage, fail silently */
451 // error_msg("Couldnt read header");
454 archive_offset
+= 512;
456 /* Check header has valid magic, unfortunately some tar files
457 * have empty (0'ed) tar entries at the end, which will
458 * cause this to fail, so fail silently for now
460 if (strncmp(tar
.formated
.magic
, "ustar", 5) != 0) {
461 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
462 if (strncmp(tar
.formated
.magic
, "\0\0\0\0\0", 5) != 0)
467 /* Do checksum on headers */
468 for (i
= 0; i
< 148 ; i
++) {
472 for (i
= 156; i
< 512 ; i
++) {
475 if (sum
!= strtol(tar
.formated
.chksum
, NULL
, 8)) {
476 if ( strtol(tar
.formated
.chksum
,NULL
,8) != 0 )
477 error_msg("Invalid tar header checksum");
481 /* convert to type'ed variables */
482 tar_entry
= xcalloc(1, sizeof(file_header_t
));
484 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
486 tar_entry
->name
= longname
;
490 tar_entry
->name
= linkname
;
495 tar_entry
->name
= xstrndup(tar
.formated
.name
, 100);
497 if (tar
.formated
.prefix
[0]) {
498 char *temp
= tar_entry
->name
;
499 char *prefixTemp
= xstrndup(tar
.formated
.prefix
, 155);
500 tar_entry
->name
= concat_path_file(prefixTemp
, temp
);
506 // tar_entry->name = xstrdup(tar.formated.name);
509 parse_mode(tar.formated.mode, &tar_entry->mode);
511 tar_entry
->mode
= 07777 & strtol(tar
.formated
.mode
, NULL
, 8);
513 tar_entry
->uid
= strtol(tar
.formated
.uid
, NULL
, 8);
514 tar_entry
->gid
= strtol(tar
.formated
.gid
, NULL
, 8);
515 tar_entry
->size
= strtol(tar
.formated
.size
, NULL
, 8);
516 tar_entry
->mtime
= strtol(tar
.formated
.mtime
, NULL
, 8);
517 tar_entry
->link_name
= *tar
.formated
.linkname
!= '\0' ? xstrndup(tar
.formated
.linkname
, 100) : NULL
;
518 tar_entry
->device
= (strtol(tar
.formated
.devmajor
, NULL
, 8) << 8) +
519 strtol(tar
.formated
.devminor
, NULL
, 8);
521 /* Fix mode, used by the old format */
522 switch (tar
.formated
.typeflag
) {
523 /* hard links are detected as regular files with 0 size and a link name */
525 tar_entry
->mode
|= S_IFREG
;
530 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
531 if (last_char_is(tar_entry
->name
, '/')) {
532 tar_entry
->mode
|= S_IFDIR
;
535 tar_entry
->mode
|= S_IFREG
;
538 tar_entry
->mode
|= S_IFLNK
;
541 tar_entry
->mode
|= S_IFCHR
;
544 tar_entry
->mode
|= S_IFBLK
;
547 tar_entry
->mode
|= S_IFDIR
;
550 tar_entry
->mode
|= S_IFIFO
;
552 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
554 longname
= xmalloc(tar_entry
->size
+ 1);
555 if(fread(longname
, tar_entry
->size
, 1, tar_stream
) != 1)
557 longname
[tar_entry
->size
] = '\0';
558 archive_offset
+= tar_entry
->size
;
560 return(get_header_tar(tar_stream
));
563 linkname
= xmalloc(tar_entry
->size
+ 1);
564 if(fread(linkname
, tar_entry
->size
, 1, tar_stream
) != 1)
566 linkname
[tar_entry
->size
] = '\0';
567 archive_offset
+= tar_entry
->size
;
569 tar_entry
->name
= linkname
;
570 return(get_header_tar(tar_stream
));
577 perror_msg("Ignoring GNU extension type %c", tar
.formated
.typeflag
);
580 perror_msg("Unknown typeflag: 0x%x", tar
.formated
.typeflag
);
589 free_header_tar(file_header_t
*tar_entry
)
591 if (tar_entry
== NULL
)
594 free(tar_entry
->name
);
595 if (tar_entry
->link_name
);
596 free(tar_entry
->link_name
);
602 deb_extract(const char *package_filename
, FILE *out_stream
,
603 const int extract_function
, const char *prefix
, const char *filename
)
605 FILE *deb_stream
= NULL
;
606 file_header_t
*ar_header
= NULL
;
607 const char **file_list
= NULL
;
608 char *output_buffer
= NULL
;
609 char *ared_file
= NULL
;
612 if (filename
!= NULL
) {
613 file_list
= xmalloc(sizeof(char *) * 2);
614 file_list
[0] = filename
;
618 if (extract_function
& extract_control_tar_gz
) {
619 ared_file
= "control.tar.gz";
621 else if (extract_function
& extract_data_tar_gz
) {
622 ared_file
= "data.tar.gz";
624 fprintf(stderr
, "no file specified to extract -- extract_function=%x\n", extract_function
);
628 /* open the debian package to be worked on */
629 deb_stream
= wfopen(package_filename
, "r");
630 if (deb_stream
== NULL
) {
633 /* set the buffer size */
634 setvbuf(deb_stream
, NULL
, _IOFBF
, 0x8000);
637 fread(ar_magic
, 1, 8, deb_stream
);
638 /*fprintf(stderr, "deb_extract ar_magic=%08x\n", *(long *)ar_magic);*/
639 if (strncmp(ar_magic
,"!<arch>",7) == 0) {
642 while ((ar_header
= get_header_ar(deb_stream
)) != NULL
) {
643 if (strcmp(ared_file
, ar_header
->name
) == 0) {
645 FILE *uncompressed_stream
;
646 /* open a stream of decompressed data */
647 uncompressed_stream
= gz_open(deb_stream
, &gunzip_pid
);
648 if (uncompressed_stream
== NULL
) {
653 output_buffer
= unarchive(uncompressed_stream
, out_stream
, get_header_tar
, free_header_tar
, extract_function
, prefix
, file_list
);
654 fclose(uncompressed_stream
);
655 gz_close(gunzip_pid
);
656 free_header_ar(ar_header
);
659 seek_sub_file(deb_stream
, ar_header
->size
);
660 free_header_ar(ar_header
);
663 } else if (strncmp(ar_magic
, "\037\213", 2) == 0) {
664 /* it's a gz file, let's assume it's an opkg */
665 int unzipped_opkg_pid
;
666 FILE *unzipped_opkg_stream
;
667 file_header_t
*tar_header
;
669 fseek(deb_stream
, 0, SEEK_SET
);
670 unzipped_opkg_stream
= gz_open(deb_stream
, &unzipped_opkg_pid
);
671 if (unzipped_opkg_stream
== NULL
) {
675 /*fprintf(stderr, __FUNCTION__ ": processing opkg %s -- ared_file=%s\n", package_filename, ared_file);*/
676 /* walk through outer tar file to find ared_file */
677 while ((tar_header
= get_header_tar(unzipped_opkg_stream
)) != NULL
) {
679 if (strncmp(tar_header
->name
, "./", 2) == 0)
681 if (strcmp(ared_file
, tar_header
->name
+name_offset
) == 0) {
683 FILE *uncompressed_stream
;
684 /* open a stream of decompressed data */
685 uncompressed_stream
= gz_open(unzipped_opkg_stream
, &gunzip_pid
);
686 if (uncompressed_stream
== NULL
) {
690 /*fprintf(stderr, __FUNCTION__ ":%d: here -- found file\n", __LINE__);*/
691 output_buffer
= unarchive(uncompressed_stream
,
698 /*fprintf(stderr, __FUNCTION__ ":%d: unarchive complete\n", __LINE__);*/
699 free_header_tar(tar_header
);
700 fclose(uncompressed_stream
);
701 gz_close(gunzip_pid
);
702 free_header_tar(tar_header
);
705 seek_sub_file(unzipped_opkg_stream
, tar_header
->size
);
706 free_header_tar(tar_header
);
708 fclose(unzipped_opkg_stream
);
709 gz_close(unzipped_opkg_pid
);
710 /*fprintf(stderr, __FUNCTION__ ":%d: done\n", __LINE__);*/
713 error_msg_and_die("invalid magic");
722 return output_buffer
;