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