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Move libbb/unarchive functions to ./archival/libunarchive
This commit is contained in:
Glenn L McGrath
parent
ef0eab514d
commit
633f153808
@ -1,627 +0,0 @@
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/*
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* Copyright (C) 2000 by Glenn McGrath
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* Copyright (C) 2001 by Laurence Anderson
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*
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* Based on previous work by busybox developers and others.
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*
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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 <stdio.h>
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#include <errno.h>
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#include <fnmatch.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 "libbb.h"
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extern void seek_sub_file(FILE *src_stream, const int count);
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extern 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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#ifdef L_archive_offset
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off_t archive_offset;
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#else
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extern off_t archive_offset;
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#endif
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#ifdef L_seek_sub_file
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void seek_sub_file(FILE *src_stream, const int count)
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{
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int i;
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/* Try to fseek as faster */
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archive_offset += count;
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if (fseek(src_stream, count, SEEK_CUR) != 0 && errno == ESPIPE) {
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for (i = 0; i < count; i++) {
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fgetc(src_stream);
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}
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}
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return;
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}
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#endif
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#ifdef L_extract_archive
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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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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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#endif
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#ifdef L_unarchive
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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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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 == TRUE) {
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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); /* may be null, but doesn't matter */
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if (file_entry->link_name) {
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free(file_entry->link_name);
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}
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free(file_entry);
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}
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return(buffer);
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}
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#endif
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#ifdef L_get_header_ar
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file_header_t *get_header_ar(FILE *src_stream)
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{
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file_header_t *typed;
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union {
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char raw[60];
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struct {
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char name[16];
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char date[12];
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char uid[6];
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char gid[6];
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char mode[8];
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char size[10];
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char magic[2];
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} formated;
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} ar;
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static char *ar_long_names;
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if (fread(ar.raw, 1, 60, src_stream) != 60) {
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return(NULL);
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}
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archive_offset += 60;
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/* align the headers based on the header magic */
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if ((ar.formated.magic[0] != '`') || (ar.formated.magic[1] != '\n')) {
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/* some version of ar, have an extra '\n' after each data entry,
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* this puts the next header out by 1 */
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if (ar.formated.magic[1] != '`') {
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error_msg("Invalid magic");
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return(NULL);
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}
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/* read the next char out of what would be the data section,
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* if its a '\n' then it is a valid header offset by 1*/
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archive_offset++;
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if (fgetc(src_stream) != '\n') {
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error_msg("Invalid magic");
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return(NULL);
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}
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/* fix up the header, we started reading 1 byte too early */
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/* raw_header[60] wont be '\n' as it should, but it doesnt matter */
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memmove(ar.raw, &ar.raw[1], 59);
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}
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typed = (file_header_t *) xcalloc(1, sizeof(file_header_t));
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typed->size = (size_t) atoi(ar.formated.size);
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/* long filenames have '/' as the first character */
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if (ar.formated.name[0] == '/') {
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if (ar.formated.name[1] == '/') {
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/* If the second char is a '/' then this entries data section
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* stores long filename for multiple entries, they are stored
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* in static variable long_names for use in future entries */
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ar_long_names = (char *) xrealloc(ar_long_names, typed->size);
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fread(ar_long_names, 1, typed->size, src_stream);
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archive_offset += typed->size;
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/* This ar entries data section only contained filenames for other records
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* they are stored in the static ar_long_names for future reference */
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return (get_header_ar(src_stream)); /* Return next header */
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} else if (ar.formated.name[1] == ' ') {
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/* This is the index of symbols in the file for compilers */
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seek_sub_file(src_stream, typed->size);
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return (get_header_ar(src_stream)); /* Return next header */
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} else {
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/* The number after the '/' indicates the offset in the ar data section
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(saved in variable long_name) that conatains the real filename */
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if (!ar_long_names) {
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error_msg("Cannot resolve long file name");
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return (NULL);
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}
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typed->name = xstrdup(ar_long_names + atoi(&ar.formated.name[1]));
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}
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} else {
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/* short filenames */
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typed->name = xcalloc(1, 16);
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strncpy(typed->name, ar.formated.name, 16);
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}
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typed->name[strcspn(typed->name, " /")]='\0';
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/* convert the rest of the now valid char header to its typed struct */
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parse_mode(ar.formated.mode, &typed->mode);
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typed->mtime = atoi(ar.formated.date);
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typed->uid = atoi(ar.formated.uid);
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typed->gid = atoi(ar.formated.gid);
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return(typed);
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}
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#endif
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#ifdef L_get_header_cpio
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struct hardlinks {
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file_header_t *entry;
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int inode;
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struct hardlinks *next;
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};
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file_header_t *get_header_cpio(FILE *src_stream)
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{
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file_header_t *cpio_entry = NULL;
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char cpio_header[110];
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int namesize;
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char dummy[16];
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int major, minor, nlink, inode;
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static struct hardlinks *saved_hardlinks = NULL;
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static int pending_hardlinks = 0;
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if (pending_hardlinks) { /* Deal with any pending hardlinks */
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struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
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while (tmp) {
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if (tmp->entry->link_name) { /* Found a hardlink ready to be extracted */
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cpio_entry = tmp->entry;
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if (oldtmp) oldtmp->next = tmp->next; /* Remove item from linked list */
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else saved_hardlinks = tmp->next;
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free(tmp);
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return (cpio_entry);
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}
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oldtmp = tmp;
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tmp = tmp->next;
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}
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pending_hardlinks = 0; /* No more pending hardlinks, read next file entry */
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}
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/* There can be padding before archive header */
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seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
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if (fread(cpio_header, 1, 110, src_stream) == 110) {
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archive_offset += 110;
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if (strncmp(cpio_header, "07070", 5) != 0) {
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error_msg("Unsupported format or invalid magic");
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return(NULL);
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}
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switch (cpio_header[5]) {
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case '2': /* "crc" header format */
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/* Doesnt do the crc check yet */
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case '1': /* "newc" header format */
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cpio_entry = (file_header_t *) xcalloc(1, sizeof(file_header_t));
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sscanf(cpio_header, "%6c%8x%8x%8x%8x%8x%8lx%8lx%16c%8x%8x%8x%8c",
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dummy, &inode, (unsigned int*)&cpio_entry->mode,
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(unsigned int*)&cpio_entry->uid, (unsigned int*)&cpio_entry->gid,
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&nlink, &cpio_entry->mtime, &cpio_entry->size,
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dummy, &major, &minor, &namesize, dummy);
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cpio_entry->name = (char *) xcalloc(1, namesize);
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fread(cpio_entry->name, 1, namesize, src_stream); /* Read in filename */
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archive_offset += namesize;
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/* Skip padding before file contents */
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seek_sub_file(src_stream, (4 - (archive_offset % 4)) % 4);
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if (strcmp(cpio_entry->name, "TRAILER!!!") == 0) {
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printf("%d blocks\n", (int) (archive_offset % 512 ? (archive_offset / 512) + 1 : archive_offset / 512)); /* Always round up */
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if (saved_hardlinks) { /* Bummer - we still have unresolved hardlinks */
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struct hardlinks *tmp = saved_hardlinks, *oldtmp = NULL;
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while (tmp) {
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error_msg("%s not created: cannot resolve hardlink", tmp->entry->name);
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oldtmp = tmp;
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tmp = tmp->next;
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free (oldtmp->entry->name);
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free (oldtmp->entry);
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free (oldtmp);
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}
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saved_hardlinks = NULL;
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pending_hardlinks = 0;
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}
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return(NULL);
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}
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if (S_ISLNK(cpio_entry->mode)) {
|
||||
cpio_entry->link_name = (char *) xcalloc(1, cpio_entry->size + 1);
|
||||
fread(cpio_entry->link_name, 1, cpio_entry->size, src_stream);
|
||||
archive_offset += cpio_entry->size;
|
||||
cpio_entry->size = 0; /* Stop possiable seeks in future */
|
||||
}
|
||||
if (nlink > 1 && !S_ISDIR(cpio_entry->mode)) {
|
||||
if (cpio_entry->size == 0) { /* Put file on a linked list for later */
|
||||
struct hardlinks *new = xmalloc(sizeof(struct hardlinks));
|
||||
new->next = saved_hardlinks;
|
||||
new->inode = inode;
|
||||
new->entry = cpio_entry;
|
||||
saved_hardlinks = new;
|
||||
return(get_header_cpio(src_stream)); /* Recurse to next file */
|
||||
} else { /* Found the file with data in */
|
||||
struct hardlinks *tmp = saved_hardlinks;
|
||||
pending_hardlinks = 1;
|
||||
while (tmp) {
|
||||
if (tmp->inode == inode) {
|
||||
tmp->entry->link_name = xstrdup(cpio_entry->name);
|
||||
nlink--;
|
||||
}
|
||||
tmp = tmp->next;
|
||||
}
|
||||
if (nlink > 1) error_msg("error resolving hardlink: did you create the archive with GNU cpio 2.0-2.2?");
|
||||
}
|
||||
}
|
||||
cpio_entry->device = (major << 8) | minor;
|
||||
break;
|
||||
default:
|
||||
error_msg("Unsupported format");
|
||||
return(NULL);
|
||||
}
|
||||
if (ferror(src_stream) || feof(src_stream)) {
|
||||
perror_msg("Stream error");
|
||||
return(NULL);
|
||||
}
|
||||
}
|
||||
return(cpio_entry);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef L_get_header_tar
|
||||
file_header_t *get_header_tar(FILE *tar_stream)
|
||||
{
|
||||
union {
|
||||
unsigned char raw[512];
|
||||
struct {
|
||||
char name[100]; /* 0-99 */
|
||||
char mode[8]; /* 100-107 */
|
||||
char uid[8]; /* 108-115 */
|
||||
char gid[8]; /* 116-123 */
|
||||
char size[12]; /* 124-135 */
|
||||
char mtime[12]; /* 136-147 */
|
||||
char chksum[8]; /* 148-155 */
|
||||
char typeflag; /* 156-156 */
|
||||
char linkname[100]; /* 157-256 */
|
||||
char magic[6]; /* 257-262 */
|
||||
char version[2]; /* 263-264 */
|
||||
char uname[32]; /* 265-296 */
|
||||
char gname[32]; /* 297-328 */
|
||||
char devmajor[8]; /* 329-336 */
|
||||
char devminor[8]; /* 337-344 */
|
||||
char prefix[155]; /* 345-499 */
|
||||
char padding[12]; /* 500-512 */
|
||||
} formated;
|
||||
} tar;
|
||||
file_header_t *tar_entry = NULL;
|
||||
long sum = 0;
|
||||
long i;
|
||||
|
||||
if (archive_offset % 512 != 0) {
|
||||
seek_sub_file(tar_stream, 512 - (archive_offset % 512));
|
||||
}
|
||||
|
||||
if (fread(tar.raw, 1, 512, tar_stream) != 512) {
|
||||
/* Unfortunatly its common for tar files to have all sorts of
|
||||
* trailing garbage, fail silently */
|
||||
// error_msg("Couldnt read header");
|
||||
return(NULL);
|
||||
}
|
||||
archive_offset += 512;
|
||||
|
||||
/* Check header has valid magic, unfortunately some tar files
|
||||
* have empty (0'ed) tar entries at the end, which will
|
||||
* cause this to fail, so fail silently for now
|
||||
*/
|
||||
if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
|
||||
return(NULL);
|
||||
}
|
||||
|
||||
/* Do checksum on headers */
|
||||
for (i = 0; i < 148 ; i++) {
|
||||
sum += tar.raw[i];
|
||||
}
|
||||
sum += ' ' * 8;
|
||||
for (i = 156; i < 512 ; i++) {
|
||||
sum += tar.raw[i];
|
||||
}
|
||||
if (sum != strtol(tar.formated.chksum, NULL, 8)) {
|
||||
error_msg("Invalid tar header checksum");
|
||||
return(NULL);
|
||||
}
|
||||
|
||||
/* convert to type'ed variables */
|
||||
tar_entry = xcalloc(1, sizeof(file_header_t));
|
||||
tar_entry->name = xstrdup(tar.formated.name);
|
||||
|
||||
parse_mode(tar.formated.mode, &tar_entry->mode);
|
||||
tar_entry->uid = strtol(tar.formated.uid, NULL, 8);
|
||||
tar_entry->gid = strtol(tar.formated.gid, NULL, 8);
|
||||
tar_entry->size = strtol(tar.formated.size, NULL, 8);
|
||||
tar_entry->mtime = strtol(tar.formated.mtime, NULL, 8);
|
||||
tar_entry->link_name = strlen(tar.formated.linkname) ?
|
||||
xstrdup(tar.formated.linkname) : NULL;
|
||||
tar_entry->device = (strtol(tar.formated.devmajor, NULL, 8) << 8) +
|
||||
strtol(tar.formated.devminor, NULL, 8);
|
||||
|
||||
return(tar_entry);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef L_deb_extract
|
||||
char *deb_extract(const char *package_filename, FILE *out_stream,
|
||||
const int extract_function, const char *prefix, const char *filename)
|
||||
{
|
||||
FILE *deb_stream;
|
||||
FILE *uncompressed_stream = NULL;
|
||||
file_header_t *ar_header = NULL;
|
||||
char **file_list = NULL;
|
||||
char *output_buffer = NULL;
|
||||
char *ared_file = NULL;
|
||||
char ar_magic[8];
|
||||
int gunzip_pid;
|
||||
|
||||
if (filename != NULL) {
|
||||
file_list = xmalloc(sizeof(char *) * 2);
|
||||
file_list[0] = xstrdup(filename);
|
||||
file_list[1] = NULL;
|
||||
}
|
||||
|
||||
if (extract_function & extract_control_tar_gz) {
|
||||
ared_file = xstrdup("control.tar.gz");
|
||||
}
|
||||
else if (extract_function & extract_data_tar_gz) {
|
||||
ared_file = xstrdup("data.tar.gz");
|
||||
}
|
||||
|
||||
/* open the debian package to be worked on */
|
||||
deb_stream = wfopen(package_filename, "r");
|
||||
if (deb_stream == NULL) {
|
||||
return(NULL);
|
||||
}
|
||||
/* set the buffer size */
|
||||
setvbuf(deb_stream, NULL, _IOFBF, 0x8000);
|
||||
|
||||
/* check ar magic */
|
||||
fread(ar_magic, 1, 8, deb_stream);
|
||||
if (strncmp(ar_magic,"!<arch>",7) != 0) {
|
||||
error_msg_and_die("invalid magic");
|
||||
}
|
||||
archive_offset = 8;
|
||||
|
||||
while ((ar_header = get_header_ar(deb_stream)) != NULL) {
|
||||
if (strcmp(ared_file, ar_header->name) == 0) {
|
||||
/* open a stream of decompressed data */
|
||||
uncompressed_stream = gz_open(deb_stream, &gunzip_pid);
|
||||
archive_offset = 0;
|
||||
output_buffer = unarchive(uncompressed_stream, out_stream, get_header_tar, extract_function, prefix, file_list, NULL);
|
||||
}
|
||||
seek_sub_file(deb_stream, ar_header->size);
|
||||
free(ar_header->name);
|
||||
free(ar_header);
|
||||
}
|
||||
gz_close(gunzip_pid);
|
||||
fclose(deb_stream);
|
||||
fclose(uncompressed_stream);
|
||||
free(ared_file);
|
||||
if (filename != NULL) {
|
||||
free(file_list[0]);
|
||||
free(file_list);
|
||||
}
|
||||
return(output_buffer);
|
||||
}
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user