241 lines
7.6 KiB
C
241 lines
7.6 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <fnmatch.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <utime.h>
|
|
#include "unarchive.h"
|
|
#include "libbb.h"
|
|
|
|
/* Extract the data postioned at src_stream to either filesystem, stdout or
|
|
* buffer depending on the value of 'function' which is defined in libbb.h
|
|
*
|
|
* prefix doesnt have to be just a directory, it may prefix the filename as well.
|
|
*
|
|
* e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath
|
|
* '/var/lib/dpkg/info/' and all files/dirs created in that dir will have
|
|
* 'dpkg.' as their prefix
|
|
*
|
|
* For this reason if prefix does point to a dir then it must end with a
|
|
* trailing '/' or else the last dir will be assumed to be the file prefix
|
|
*/
|
|
char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry,
|
|
const int function, const char *prefix)
|
|
{
|
|
FILE *dst_stream = NULL;
|
|
char *full_name = NULL;
|
|
char *buffer = NULL;
|
|
struct utimbuf t;
|
|
|
|
/* prefix doesnt have to be a proper path it may prepend
|
|
* the filename as well */
|
|
if (prefix != NULL) {
|
|
/* strip leading '/' in filename to extract as prefix may not be dir */
|
|
/* Cant use concat_path_file here as prefix might not be a directory */
|
|
char *path = file_entry->name;
|
|
if (strncmp("./", path, 2) == 0) {
|
|
path += 2;
|
|
if (strlen(path) == 0) {
|
|
return(NULL);
|
|
}
|
|
}
|
|
full_name = xmalloc(strlen(prefix) + strlen(path) + 1);
|
|
strcpy(full_name, prefix);
|
|
strcat(full_name, path);
|
|
} else {
|
|
full_name = file_entry->name;
|
|
}
|
|
if (function & extract_to_stdout) {
|
|
if (S_ISREG(file_entry->mode)) {
|
|
copy_file_chunk(src_stream, out_stream, file_entry->size);
|
|
archive_offset += file_entry->size;
|
|
}
|
|
}
|
|
else if (function & extract_one_to_buffer) {
|
|
if (S_ISREG(file_entry->mode)) {
|
|
buffer = (char *) xmalloc(file_entry->size + 1);
|
|
fread(buffer, 1, file_entry->size, src_stream);
|
|
buffer[file_entry->size] = '\0';
|
|
archive_offset += file_entry->size;
|
|
return(buffer);
|
|
}
|
|
}
|
|
else if (function & extract_all_to_fs) {
|
|
struct stat oldfile;
|
|
int stat_res;
|
|
stat_res = lstat (full_name, &oldfile);
|
|
if (stat_res == 0) { /* The file already exists */
|
|
if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) {
|
|
if (!S_ISDIR(oldfile.st_mode)) {
|
|
unlink(full_name); /* Directories might not be empty etc */
|
|
}
|
|
} else {
|
|
if ((function & extract_quiet) != extract_quiet) {
|
|
error_msg("%s not created: newer or same age file exists", file_entry->name);
|
|
}
|
|
seek_sub_file(src_stream, file_entry->size);
|
|
return (NULL);
|
|
}
|
|
}
|
|
if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */
|
|
char *buf, *parent;
|
|
buf = xstrdup(full_name);
|
|
parent = dirname(buf);
|
|
if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) {
|
|
if ((function & extract_quiet) != extract_quiet) {
|
|
error_msg("couldn't create leading directories");
|
|
}
|
|
}
|
|
free (buf);
|
|
}
|
|
switch(file_entry->mode & S_IFMT) {
|
|
case S_IFREG:
|
|
if (file_entry->link_name) { /* Found a cpio hard link */
|
|
if (link(file_entry->link_name, full_name) != 0) {
|
|
if ((function & extract_quiet) != extract_quiet) {
|
|
perror_msg("Cannot link from %s to '%s'",
|
|
file_entry->name, file_entry->link_name);
|
|
}
|
|
}
|
|
} else {
|
|
if ((dst_stream = wfopen(full_name, "w")) == NULL) {
|
|
seek_sub_file(src_stream, file_entry->size);
|
|
return NULL;
|
|
}
|
|
archive_offset += file_entry->size;
|
|
copy_file_chunk(src_stream, dst_stream, file_entry->size);
|
|
fclose(dst_stream);
|
|
}
|
|
break;
|
|
case S_IFDIR:
|
|
if (stat_res != 0) {
|
|
if (mkdir(full_name, file_entry->mode) < 0) {
|
|
if ((function & extract_quiet) != extract_quiet) {
|
|
perror_msg("extract_archive: %s", full_name);
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case S_IFLNK:
|
|
if (symlink(file_entry->link_name, full_name) < 0) {
|
|
if ((function & extract_quiet) != extract_quiet) {
|
|
perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name);
|
|
}
|
|
return NULL;
|
|
}
|
|
break;
|
|
case S_IFSOCK:
|
|
case S_IFBLK:
|
|
case S_IFCHR:
|
|
case S_IFIFO:
|
|
if (mknod(full_name, file_entry->mode, file_entry->device) == -1) {
|
|
if ((function & extract_quiet) != extract_quiet) {
|
|
perror_msg("Cannot create node %s", file_entry->name);
|
|
}
|
|
return NULL;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Changing a symlink's properties normally changes the properties of the
|
|
* file pointed to, so dont try and change the date or mode, lchown does
|
|
* does the right thing, but isnt available in older versions of libc */
|
|
if (S_ISLNK(file_entry->mode)) {
|
|
#if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1)
|
|
lchown(full_name, file_entry->uid, file_entry->gid);
|
|
#endif
|
|
} else {
|
|
if (function & extract_preserve_date) {
|
|
t.actime = file_entry->mtime;
|
|
t.modtime = file_entry->mtime;
|
|
utime(full_name, &t);
|
|
}
|
|
chmod(full_name, file_entry->mode);
|
|
chown(full_name, file_entry->uid, file_entry->gid);
|
|
}
|
|
} else {
|
|
/* If we arent extracting data we have to skip it,
|
|
* if data size is 0 then then just do it anyway
|
|
* (saves testing for it) */
|
|
seek_sub_file(src_stream, file_entry->size);
|
|
}
|
|
|
|
/* extract_list and extract_verbose_list can be used in conjunction
|
|
* with one of the above four extraction functions, so do this seperately */
|
|
if (function & extract_verbose_list) {
|
|
fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode),
|
|
file_entry->uid, file_entry->gid,
|
|
(int) file_entry->size, time_string(file_entry->mtime));
|
|
}
|
|
if ((function & extract_list) || (function & extract_verbose_list)){
|
|
/* fputs doesnt add a trailing \n, so use fprintf */
|
|
fprintf(out_stream, "%s\n", full_name);
|
|
}
|
|
|
|
free(full_name);
|
|
|
|
return(NULL); /* Maybe we should say if failed */
|
|
}
|
|
|
|
char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers)(FILE *),
|
|
const int extract_function, const char *prefix, char **include_name, char **exclude_name)
|
|
{
|
|
file_header_t *file_entry;
|
|
int extract_flag = TRUE;
|
|
int i;
|
|
char *buffer = NULL;
|
|
|
|
archive_offset = 0;
|
|
while ((file_entry = get_headers(src_stream)) != NULL) {
|
|
|
|
if (include_name != NULL) {
|
|
extract_flag = FALSE;
|
|
for(i = 0; include_name[i] != 0; i++) {
|
|
if (fnmatch(include_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
|
|
extract_flag = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
extract_flag = TRUE;
|
|
}
|
|
|
|
/* If the file entry is in the exclude list dont extract it */
|
|
if (exclude_name != NULL) {
|
|
for(i = 0; exclude_name[i] != 0; i++) {
|
|
if (fnmatch(exclude_name[i], file_entry->name, FNM_LEADING_DIR) == 0) {
|
|
extract_flag = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (extract_flag == TRUE) {
|
|
buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix);
|
|
} else {
|
|
/* seek past the data entry */
|
|
seek_sub_file(src_stream, file_entry->size);
|
|
}
|
|
free(file_entry->name);
|
|
free(file_entry->link_name);
|
|
free(file_entry);
|
|
}
|
|
return(buffer);
|
|
} |