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.
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.
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.
17 * In privileged mode if uname and gname map to a uid and gid then use the
18 * mapped value instead of the uid/gid values in tar header
21 * GNU tar and star man pages,
22 * Opengroup's ustar interchange format,
23 * http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
29 #include <sys/sysmacros.h> /* For makedev */
30 #include "unarchive.h"
33 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
34 static char *longname = NULL;
35 static char *linkname = NULL;
38 extern char get_header_tar(archive_handle_t *archive_handle)
40 file_header_t *file_header = archive_handle->file_header;
42 /* ustar header, Posix 1003.1 */
43 unsigned char raw[512];
45 char name[100]; /* 0-99 */
46 char mode[8]; /* 100-107 */
47 char uid[8]; /* 108-115 */
48 char gid[8]; /* 116-123 */
49 char size[12]; /* 124-135 */
50 char mtime[12]; /* 136-147 */
51 char chksum[8]; /* 148-155 */
52 char typeflag; /* 156-156 */
53 char linkname[100]; /* 157-256 */
54 char magic[6]; /* 257-262 */
55 char version[2]; /* 263-264 */
56 char uname[32]; /* 265-296 */
57 char gname[32]; /* 297-328 */
58 char devmajor[8]; /* 329-336 */
59 char devminor[8]; /* 337-344 */
60 char prefix[155]; /* 345-499 */
61 char padding[12]; /* 500-512 */
69 data_align(archive_handle, 512);
71 if (bb_full_read(archive_handle->src_fd, tar.raw, 512) != 512) {
72 /* Assume end of file */
75 archive_handle->offset += 512;
77 /* If there is no filename its an empty header */
78 if (tar.formated.name[0] == 0) {
80 /* This is the second consecutive empty header! End of archive!
81 * Read until the end to empty the pipe from gz or bz2
83 while (bb_full_read(archive_handle->src_fd, tar.raw, 512) == 512);
91 /* Check header has valid magic, "ustar" is for the proper tar
92 * 0's are for the old tar format
94 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
95 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
96 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
98 bb_error_msg_and_die("Invalid tar magic");
100 /* Do checksum on headers */
101 for (i = 0; i < 148 ; i++) {
105 for (i = 156; i < 512 ; i++) {
108 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
109 bb_error_msg("Invalid tar header checksum");
110 return(EXIT_FAILURE);
113 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
115 file_header->name = longname;
119 file_header->name = linkname;
123 if (tar.formated.prefix[0] == 0) {
124 file_header->name = strdup(tar.formated.name);
126 file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name);
129 file_header->uid = strtol(tar.formated.uid, NULL, 8);
130 file_header->gid = strtol(tar.formated.gid, NULL, 8);
131 file_header->size = strtol(tar.formated.size, NULL, 8);
132 file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
133 file_header->link_name = (tar.formated.linkname[0] != '\0') ?
134 bb_xstrdup(tar.formated.linkname) : NULL;
135 file_header->device = makedev(strtol(tar.formated.devmajor, NULL, 8),
136 strtol(tar.formated.devminor, NULL, 8));
138 /* Set bits 0-11 of the files mode */
139 file_header->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
141 /* Set bits 12-15 of the files mode */
142 switch (tar.formated.typeflag) {
143 /* busybox identifies hard links as being regular files with 0 size and a link name */
145 file_header->mode |= S_IFREG;
149 bb_error_msg_and_die("pax is not tar");
152 /* Reserved for high performance files, treat as normal file */
155 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
156 if (last_char_is(file_header->name, '/')) {
157 file_header->mode |= S_IFDIR;
160 file_header->mode |= S_IFREG;
163 file_header->mode |= S_IFLNK;
166 file_header->mode |= S_IFCHR;
169 file_header->mode |= S_IFBLK;
172 file_header->mode |= S_IFDIR;
175 file_header->mode |= S_IFIFO;
177 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
179 longname = xmalloc(file_header->size + 1);
180 archive_xread_all(archive_handle, longname, file_header->size);
181 longname[file_header->size] = '\0';
182 archive_handle->offset += file_header->size;
184 return(get_header_tar(archive_handle));
187 linkname = xmalloc(file_header->size + 1);
188 archive_xread_all(archive_handle, linkname, file_header->size);
189 linkname[file_header->size] = '\0';
190 archive_handle->offset += file_header->size;
192 file_header->name = linkname;
193 return(get_header_tar(archive_handle));
195 case 'D': /* GNU dump dir */
196 case 'M': /* Continuation of multi volume archive*/
197 case 'N': /* Old GNU for names > 100 characters */
198 case 'S': /* Sparse file */
199 case 'V': /* Volume header */
200 bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
203 bb_error_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
205 { /* Strip trailing '/' in directories */
206 /* Must be done after mode is set as '/' is used to check if its a directory */
207 char *tmp = last_char_is(file_header->name, '/');
213 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
214 archive_handle->action_header(archive_handle->file_header);
215 archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
216 archive_handle->action_data(archive_handle);
217 archive_handle->passed = llist_add_to(archive_handle->passed, file_header->name);
219 data_skip(archive_handle);
221 archive_handle->offset += file_header->size;
223 free(file_header->link_name);
225 return(EXIT_SUCCESS);