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.
30 typedef struct file_headers_s {
42 extern void seek_sub_file(FILE *src_stream, const int count);
43 extern char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
44 const int function, const char *prefix);
47 #ifdef L_archive_offset
50 extern off_t archive_offset;
53 #ifdef L_seek_sub_file
54 void seek_sub_file(FILE *src_stream, const int count)
57 /* Try to fseek as faster */
58 archive_offset += count;
59 if (fseek(src_stream, count, SEEK_CUR) != 0 && errno == ESPIPE) {
60 for (i = 0; i < count; i++) {
70 #ifdef L_extract_archive
71 /* Extract the data postioned at src_stream to either filesystem, stdout or
72 * buffer depending on the value of 'function' which is defined in libbb.h
74 * prefix doesnt have to be just a directory, it may prefix the filename as well.
76 * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
77 * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
78 * 'dpkg.' as their prefix
80 * For this reason if prefix does point to a dir then it must end with a
81 * trailing '/' or else the last dir will be assumed to be the file prefix
83 char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
84 const int function, const char *prefix)
86 FILE *dst_stream = NULL;
87 char *full_name = NULL;
91 /* prefix doesnt have to be a proper path it may prepend
92 * the filename as well */
94 /* strip leading '/' in filename to extract as prefix may not be dir */
95 /* Cant use concat_path_file here as prefix might not be a directory */
96 char *path = file_entry->name;
100 full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
101 strcpy(full_name, prefix);
102 strcat(full_name, path);
104 full_name = file_entry->name;
107 if (function & extract_to_stdout) {
108 if (S_ISREG(file_entry->mode)) {
109 copy_file_chunk(src_stream, out_stream, file_entry->size);
110 archive_offset += file_entry->size;
113 else if (function & extract_one_to_buffer) {
114 if (S_ISREG(file_entry->mode)) {
115 buffer = (char *) xmalloc(file_entry->size + 1);
116 fread(buffer, 1, file_entry->size, src_stream);
117 archive_offset += file_entry->size;
121 else if (function & extract_all_to_fs) {
124 if ( (S_ISLNK(file_entry->mode) ? lstat (full_name, &oldfile) : stat (full_name, &oldfile)) == 0) { /* The file already exists */
125 if (function & extract_unconditional || oldfile.st_mtime < file_entry->mtime) {
126 if (!S_ISDIR(oldfile.st_mode)) {
127 unlink(full_name); /* Directories might not be empty etc */
130 error_msg("%s not created: newer or same age file exists", file_entry->name);
131 if (S_ISREG(file_entry->mode)) {
132 seek_sub_file(src_stream, file_entry->size);
138 switch(file_entry->mode & S_IFMT) {
140 if (file_entry->link_name) { /* Found a cpio hard link */
141 if (link(file_entry->link_name, full_name) != 0) {
142 perror_msg("Cannot link from %s to '%s'",
143 file_entry->name, file_entry->link_name);
146 if ((dst_stream = wfopen(full_name, "w")) == NULL) {
147 seek_sub_file(src_stream, file_entry->size);
150 archive_offset += file_entry->size;
151 copy_file_chunk(src_stream, dst_stream, file_entry->size);
156 /* Use make_directory instead of mkdir in case prefix path hasn't been created */
157 if (function & extract_create_dirs) {
158 if (make_directory(full_name, file_entry->mode, FILEUTILS_RECUR) < 0) {
164 if (symlink(file_entry->link_name, full_name) < 0) {
165 perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
173 if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
174 perror_msg("Cannot create node %s", file_entry->name);
180 /* Changing a symlink's properties normally changes the properties of the
181 * file pointed to, so dont try and change the date or mode, lchown does
182 * does the right thing, but isnt available in older versions of libc */
183 if (S_ISLNK(file_entry->mode)) {
184 #if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
185 lchown(full_name, file_entry->uid, file_entry->gid);
188 if (function & extract_preserve_date) {
189 t.actime = file_entry->mtime;
190 t.modtime = file_entry->mtime;
191 utime(full_name, &t);
193 chmod(full_name, file_entry->mode);
194 chown(full_name, file_entry->uid, file_entry->gid);
197 /* If we arent extracting data we have to skip it,
198 * if data size is 0 then then just do it anyway
199 * (saves testing for it) */
200 seek_sub_file(src_stream, file_entry->size);
203 /* extract_list and extract_verbose_list can be used in conjunction
204 * with one of the above four extraction functions, so do this seperately */
205 if (function & extract_verbose_list) {
206 fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
207 file_entry->uid, file_entry->gid,
208 (int) file_entry->size, time_string(file_entry->mtime));
210 if ((function & extract_list) || (function & extract_verbose_list)){
211 /* fputs doesnt add a trailing \n, so use fprintf */
212 fprintf(out_stream, "%s\n", file_entry->name);
217 return(NULL); /* Maybe we should say if failed */
222 char *unarchive(FILE *src_stream, void *(*get_headers)(FILE *),
223 const int extract_function, const char *prefix, char **extract_names)
225 file_header_t *file_entry;
231 while ((file_entry = (file_header_t *) get_headers(src_stream)) != NULL) {
233 if (extract_names[0] != NULL) {
234 for(i = 0; extract_names[i] != 0; i++) {
235 if (strcmp(extract_names[i], file_entry->name) == 0) {
240 /* seek past the data entry */
241 if (!S_ISLNK(file_entry->mode) && file_entry->link_name && file_entry->size == 0) {
242 error_msg("You should extract %s as other files are hardlinked to it", file_entry->name);
244 seek_sub_file(src_stream, file_entry->size);
248 buffer = extract_archive(src_stream, stdout, file_entry, extract_function, prefix);
254 #ifdef L_get_header_ar
255 void *get_header_ar(FILE *src_stream)
257 file_header_t *typed;
270 static char *ar_long_names;
272 if (fread(ar.raw, 1, 60, src_stream) != 60) {
275 archive_offset += 60;
276 /* align the headers based on the header magic */
277 if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
278 /* some version of ar, have an extra '\n' after each data entry,
279 * this puts the next header out by 1 */
280 if (ar.formated.magic[1] != '`') {
281 error_msg("Invalid magic");
284 /* read the next char out of what would be the data section,
285 * if its a '\n' then it is a valid header offset by 1*/
287 if (fgetc(src_stream) != '\n') {
288 error_msg("Invalid magic");
291 /* fix up the header, we started reading 1 byte too early */
292 /* raw_header[60] wont be '\n' as it should, but it doesnt matter */
293 memmove(ar.raw, &ar.raw[1], 59);
296 typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
298 typed->size = (size_t) atoi(ar.formated.size);
299 /* long filenames have '/' as the first character */
300 if (ar.formated.name[0] == '/') {
301 if (ar.formated.name[1] == '/') {
302 /* If the second char is a '/' then this entries data section
303 * stores long filename for multiple entries, they are stored
304 * in static variable long_names for use in future entries */
305 ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
306 fread(ar_long_names, 1, typed->size, src_stream);
307 archive_offset += typed->size;
308 /* This ar entries data section only contained filenames for other records
309 * they are stored in the static ar_long_names for future reference */
312 /* The number after the '/' indicates the offset in the ar data section
313 (saved in variable long_name) that conatains the real filename */
314 if (!ar_long_names) {
315 error_msg("Cannot resolve long file name");
318 typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
321 /* short filenames */
322 typed->name = xcalloc(1, 16);
323 strncpy(typed->name, ar.formated.name, 16);
325 typed->name[strcspn(typed->name, " /")]='\0';
327 /* convert the rest of the now valid char header to its typed struct */
328 parse_mode(ar.formated.mode, &typed->mode);
329 typed->mtime = atoi(ar.formated.date);
330 typed->uid = atoi(ar.formated.uid);
331 typed->gid = atoi(ar.formated.gid);
337 #ifdef L_get_header_cpio
338 void *get_header_cpio(FILE *src_stream)
340 file_header_t *cpio_entry = NULL;
341 char cpio_header[110];
344 int major, minor, nlink;
346 /* There can be padding before archive header */
347 seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
348 if (fread(cpio_header, 1, 110, src_stream) == 110) {
349 archive_offset += 110;
350 if (strncmp(cpio_header, "07070", 5) != 0) {
351 error_msg("Unsupported format or invalid magic");
354 switch (cpio_header[5]) {
355 case '2': /* "crc" header format */
356 /* Doesnt do the crc check yet */
357 case '1': /* "newc" header format */
358 cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
359 sscanf(cpio_header, "%14c%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
360 dummy, &cpio_entry->mode, &cpio_entry->uid, &cpio_entry->gid,
361 &nlink, &cpio_entry->mtime, &cpio_entry->size,
362 dummy, &major, &minor, &namesize, dummy);
364 cpio_entry->name = (char *) xcalloc(1, namesize);
365 fread(cpio_entry->name, 1, namesize, src_stream); /* Read in filename */
366 archive_offset += namesize;
367 /* Skip padding before file contents */
368 seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
369 if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
370 printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
374 if (S_ISLNK(cpio_entry->mode)) {
375 cpio_entry->link_name = (char *) xcalloc(1, cpio_entry->size + 1);
376 fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
377 archive_offset += cpio_entry->size;
379 if (nlink > 1 && !S_ISDIR(cpio_entry->mode) && cpio_entry->size == 0) {
380 error_msg("%s not extracted: Cannot handle hard links yet", cpio_entry->name);
381 return(get_header_cpio(src_stream)); /* Recurse to next file */
383 cpio_entry->device = (major << 8) | minor;
386 error_msg("Unsupported format");
389 if (ferror(src_stream) || feof(src_stream)) {
390 perror_msg("Stream error");
398 #ifdef L_get_header_tar
399 void *get_header_tar(FILE *tar_stream)
402 unsigned char raw[512];
404 char name[100]; /* 0-99 */
405 char mode[8]; /* 100-107 */
406 char uid[8]; /* 108-115 */
407 char gid[8]; /* 116-123 */
408 char size[12]; /* 124-135 */
409 char mtime[12]; /* 136-147 */
410 char chksum[8]; /* 148-155 */
411 char typeflag; /* 156-156 */
412 char linkname[100]; /* 157-256 */
413 char magic[6]; /* 257-262 */
414 char version[2]; /* 263-264 */
415 char uname[32]; /* 265-296 */
416 char gname[32]; /* 297-328 */
417 char devmajor[8]; /* 329-336 */
418 char devminor[8]; /* 337-344 */
419 char prefix[155]; /* 345-499 */
420 char padding[12]; /* 500-512 */
423 file_header_t *tar_entry = NULL;
427 if (archive_offset % 512 != 0) {
428 seek_sub_file(tar_stream, 512 - (archive_offset % 512));
431 if (fread(tar.raw, 1, 512, tar_stream) != 512) {
432 error_msg("Couldnt read header");
435 archive_offset += 512;
437 /* Check header has valid magic, unfortunately some tar files
438 * have empty (0'ed) tar entries at the end, which will
439 * cause this to fail, so fail silently for now
441 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
445 /* Do checksum on headers */
446 for (i = 0; i < 148 ; i++) {
450 for (i = 156; i < 512 ; i++) {
453 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
454 error_msg("Invalid tar header checksum");
458 /* convert to type'ed variables */
459 tar_entry = xcalloc(1, sizeof(file_header_t));
460 tar_entry->name = xstrdup(tar.formated.name);
462 parse_mode(tar.formated.mode, &tar_entry->mode);
463 tar_entry->uid = strtol(tar.formated.uid, NULL, 8);
464 tar_entry->gid = strtol(tar.formated.gid, NULL, 8);
465 tar_entry->size = strtol(tar.formated.size, NULL, 8);
466 tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
467 tar_entry->link_name = strlen(tar.formated.linkname) ? xstrdup(tar.formated.linkname) : NULL;
468 tar_entry->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) +
469 strtol(tar.formated.devminor, NULL, 8);
476 char *deb_extract(const char *package_filename, FILE *out_stream, const int extract_function,
477 const char *prefix, const char *filename)
480 FILE *uncompressed_stream = NULL;
481 file_header_t *ar_header = NULL;
482 char *output_buffer = NULL;
483 char *ared_file = NULL;
488 file_list = malloc(sizeof(char *));
489 file_list[0] = xstrdup(filename);
492 if (extract_function & extract_control_tar_gz) {
493 ared_file = xstrdup("control.tar.gz");
495 else if (extract_function & extract_data_tar_gz) {
496 ared_file = xstrdup("data.tar.gz");
499 /* open the debian package to be worked on */
500 deb_stream = wfopen(package_filename, "r");
503 fread(ar_magic, 1, 8, deb_stream);
504 if (strncmp(ar_magic,"!<arch>",7) != 0) {
505 error_msg_and_die("invalid magic");
509 while ((ar_header = get_header_ar(deb_stream)) != NULL) {
510 if (strcmp(ared_file, ar_header->name) == 0) {
511 /* open a stream of decompressed data */
512 uncompressed_stream = gz_open(deb_stream, &gunzip_pid);
514 output_buffer = unarchive(uncompressed_stream, get_header_tar, extract_function, prefix, file_list);
516 seek_sub_file(deb_stream, ar_header->size);
518 gz_close(gunzip_pid);
520 fclose(uncompressed_stream);
522 return(output_buffer);