Glenn L McGrath | 95ebf61 | 2001-10-25 14:18:08 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of the GNU General Public License as published by |
| 4 | * the Free Software Foundation; either version 2 of the License, or |
| 5 | * (at your option) any later version. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU Library General Public License for more details. |
| 11 | * |
| 12 | * You should have received a copy of the GNU General Public License |
| 13 | * along with this program; if not, write to the Free Software |
| 14 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <fnmatch.h> |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <unistd.h> |
| 23 | #include <utime.h> |
| 24 | #include "unarchive.h" |
| 25 | #include "libbb.h" |
| 26 | |
| 27 | /* Extract the data postioned at src_stream to either filesystem, stdout or |
| 28 | * buffer depending on the value of 'function' which is defined in libbb.h |
| 29 | * |
| 30 | * prefix doesnt have to be just a directory, it may prefix the filename as well. |
| 31 | * |
| 32 | * e.g. '/var/lib/dpkg/info/dpkg.' will extract all files to the base bath |
| 33 | * '/var/lib/dpkg/info/' and all files/dirs created in that dir will have |
| 34 | * 'dpkg.' as their prefix |
| 35 | * |
| 36 | * For this reason if prefix does point to a dir then it must end with a |
| 37 | * trailing '/' or else the last dir will be assumed to be the file prefix |
| 38 | */ |
| 39 | char *extract_archive(FILE *src_stream, FILE *out_stream, const file_header_t *file_entry, |
| 40 | const int function, const char *prefix) |
| 41 | { |
| 42 | FILE *dst_stream = NULL; |
| 43 | char *full_name = NULL; |
| 44 | char *buffer = NULL; |
| 45 | struct utimbuf t; |
| 46 | |
| 47 | /* prefix doesnt have to be a proper path it may prepend |
| 48 | * the filename as well */ |
| 49 | if (prefix != NULL) { |
| 50 | /* strip leading '/' in filename to extract as prefix may not be dir */ |
| 51 | /* Cant use concat_path_file here as prefix might not be a directory */ |
| 52 | char *path = file_entry->name; |
| 53 | if (strncmp("./", path, 2) == 0) { |
| 54 | path += 2; |
| 55 | if (strlen(path) == 0) { |
| 56 | return(NULL); |
| 57 | } |
| 58 | } |
| 59 | full_name = xmalloc(strlen(prefix) + strlen(path) + 1); |
| 60 | strcpy(full_name, prefix); |
| 61 | strcat(full_name, path); |
| 62 | } else { |
| 63 | full_name = file_entry->name; |
| 64 | } |
| 65 | if (function & extract_to_stdout) { |
| 66 | if (S_ISREG(file_entry->mode)) { |
| 67 | copy_file_chunk(src_stream, out_stream, file_entry->size); |
| 68 | archive_offset += file_entry->size; |
| 69 | } |
| 70 | } |
| 71 | else if (function & extract_one_to_buffer) { |
| 72 | if (S_ISREG(file_entry->mode)) { |
| 73 | buffer = (char *) xmalloc(file_entry->size + 1); |
| 74 | fread(buffer, 1, file_entry->size, src_stream); |
| 75 | buffer[file_entry->size] = '\0'; |
| 76 | archive_offset += file_entry->size; |
| 77 | return(buffer); |
| 78 | } |
| 79 | } |
| 80 | else if (function & extract_all_to_fs) { |
| 81 | struct stat oldfile; |
| 82 | int stat_res; |
| 83 | stat_res = lstat (full_name, &oldfile); |
| 84 | if (stat_res == 0) { /* The file already exists */ |
| 85 | if ((function & extract_unconditional) || (oldfile.st_mtime < file_entry->mtime)) { |
| 86 | if (!S_ISDIR(oldfile.st_mode)) { |
| 87 | unlink(full_name); /* Directories might not be empty etc */ |
| 88 | } |
| 89 | } else { |
| 90 | if ((function & extract_quiet) != extract_quiet) { |
| 91 | error_msg("%s not created: newer or same age file exists", file_entry->name); |
| 92 | } |
| 93 | seek_sub_file(src_stream, file_entry->size); |
| 94 | return (NULL); |
| 95 | } |
| 96 | } |
| 97 | if (function & extract_create_leading_dirs) { /* Create leading directories with default umask */ |
| 98 | char *buf, *parent; |
| 99 | buf = xstrdup(full_name); |
| 100 | parent = dirname(buf); |
| 101 | if (make_directory (parent, -1, FILEUTILS_RECUR) != 0) { |
| 102 | if ((function & extract_quiet) != extract_quiet) { |
| 103 | error_msg("couldn't create leading directories"); |
| 104 | } |
| 105 | } |
| 106 | free (buf); |
| 107 | } |
| 108 | switch(file_entry->mode & S_IFMT) { |
| 109 | case S_IFREG: |
| 110 | if (file_entry->link_name) { /* Found a cpio hard link */ |
| 111 | if (link(file_entry->link_name, full_name) != 0) { |
| 112 | if ((function & extract_quiet) != extract_quiet) { |
| 113 | perror_msg("Cannot link from %s to '%s'", |
| 114 | file_entry->name, file_entry->link_name); |
| 115 | } |
| 116 | } |
| 117 | } else { |
| 118 | if ((dst_stream = wfopen(full_name, "w")) == NULL) { |
| 119 | seek_sub_file(src_stream, file_entry->size); |
| 120 | return NULL; |
| 121 | } |
| 122 | archive_offset += file_entry->size; |
| 123 | copy_file_chunk(src_stream, dst_stream, file_entry->size); |
| 124 | fclose(dst_stream); |
| 125 | } |
| 126 | break; |
| 127 | case S_IFDIR: |
| 128 | if (stat_res != 0) { |
| 129 | if (mkdir(full_name, file_entry->mode) < 0) { |
| 130 | if ((function & extract_quiet) != extract_quiet) { |
| 131 | perror_msg("extract_archive: %s", full_name); |
| 132 | } |
| 133 | } |
| 134 | } |
| 135 | break; |
| 136 | case S_IFLNK: |
| 137 | if (symlink(file_entry->link_name, full_name) < 0) { |
| 138 | if ((function & extract_quiet) != extract_quiet) { |
| 139 | perror_msg("Cannot create symlink from %s to '%s'", file_entry->name, file_entry->link_name); |
| 140 | } |
| 141 | return NULL; |
| 142 | } |
| 143 | break; |
| 144 | case S_IFSOCK: |
| 145 | case S_IFBLK: |
| 146 | case S_IFCHR: |
| 147 | case S_IFIFO: |
| 148 | if (mknod(full_name, file_entry->mode, file_entry->device) == -1) { |
| 149 | if ((function & extract_quiet) != extract_quiet) { |
| 150 | perror_msg("Cannot create node %s", file_entry->name); |
| 151 | } |
| 152 | return NULL; |
| 153 | } |
| 154 | break; |
| 155 | } |
| 156 | |
| 157 | /* Changing a symlink's properties normally changes the properties of the |
| 158 | * file pointed to, so dont try and change the date or mode, lchown does |
| 159 | * does the right thing, but isnt available in older versions of libc */ |
| 160 | if (S_ISLNK(file_entry->mode)) { |
| 161 | #if (__GLIBC__ > 2) && (__GLIBC_MINOR__ > 1) |
| 162 | lchown(full_name, file_entry->uid, file_entry->gid); |
| 163 | #endif |
| 164 | } else { |
| 165 | if (function & extract_preserve_date) { |
| 166 | t.actime = file_entry->mtime; |
| 167 | t.modtime = file_entry->mtime; |
| 168 | utime(full_name, &t); |
| 169 | } |
| 170 | chmod(full_name, file_entry->mode); |
| 171 | chown(full_name, file_entry->uid, file_entry->gid); |
| 172 | } |
| 173 | } else { |
| 174 | /* If we arent extracting data we have to skip it, |
| 175 | * if data size is 0 then then just do it anyway |
| 176 | * (saves testing for it) */ |
| 177 | seek_sub_file(src_stream, file_entry->size); |
| 178 | } |
| 179 | |
| 180 | /* extract_list and extract_verbose_list can be used in conjunction |
| 181 | * with one of the above four extraction functions, so do this seperately */ |
| 182 | if (function & extract_verbose_list) { |
| 183 | fprintf(out_stream, "%s %d/%d %8d %s ", mode_string(file_entry->mode), |
| 184 | file_entry->uid, file_entry->gid, |
| 185 | (int) file_entry->size, time_string(file_entry->mtime)); |
| 186 | } |
| 187 | if ((function & extract_list) || (function & extract_verbose_list)){ |
| 188 | /* fputs doesnt add a trailing \n, so use fprintf */ |
| 189 | fprintf(out_stream, "%s\n", full_name); |
| 190 | } |
| 191 | |
| 192 | free(full_name); |
| 193 | |
| 194 | return(NULL); /* Maybe we should say if failed */ |
| 195 | } |
| 196 | |
| 197 | char *unarchive(FILE *src_stream, FILE *out_stream, file_header_t *(*get_headers)(FILE *), |
| 198 | const int extract_function, const char *prefix, char **include_name, char **exclude_name) |
| 199 | { |
| 200 | file_header_t *file_entry; |
| 201 | int extract_flag = TRUE; |
| 202 | int i; |
| 203 | char *buffer = NULL; |
| 204 | |
| 205 | archive_offset = 0; |
| 206 | while ((file_entry = get_headers(src_stream)) != NULL) { |
| 207 | |
| 208 | if (include_name != NULL) { |
| 209 | extract_flag = FALSE; |
| 210 | for(i = 0; include_name[i] != 0; i++) { |
| 211 | if (fnmatch(include_name[i], file_entry->name, FNM_LEADING_DIR) == 0) { |
| 212 | extract_flag = TRUE; |
| 213 | break; |
| 214 | } |
| 215 | } |
| 216 | } else { |
| 217 | extract_flag = TRUE; |
| 218 | } |
| 219 | |
| 220 | /* If the file entry is in the exclude list dont extract it */ |
| 221 | if (exclude_name != NULL) { |
| 222 | for(i = 0; exclude_name[i] != 0; i++) { |
| 223 | if (fnmatch(exclude_name[i], file_entry->name, FNM_LEADING_DIR) == 0) { |
| 224 | extract_flag = FALSE; |
| 225 | break; |
| 226 | } |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | if (extract_flag == TRUE) { |
| 231 | buffer = extract_archive(src_stream, out_stream, file_entry, extract_function, prefix); |
| 232 | } else { |
| 233 | /* seek past the data entry */ |
| 234 | seek_sub_file(src_stream, file_entry->size); |
| 235 | } |
| 236 | free(file_entry->name); |
| 237 | free(file_entry->link_name); |
| 238 | free(file_entry); |
| 239 | } |
| 240 | return(buffer); |
| 241 | } |