| /* |
| * 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); |
| } |