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.
20 #include "unarchive.h"
23 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
24 static char *longname = NULL;
25 static char *linkname = NULL;
28 extern char get_header_tar(archive_handle_t *archive_handle)
30 file_header_t *file_header = archive_handle->file_header;
32 /* ustar header, Posix 1003.1 */
33 unsigned char raw[512];
35 char name[100]; /* 0-99 */
36 char mode[8]; /* 100-107 */
37 char uid[8]; /* 108-115 */
38 char gid[8]; /* 116-123 */
39 char size[12]; /* 124-135 */
40 char mtime[12]; /* 136-147 */
41 char chksum[8]; /* 148-155 */
42 char typeflag; /* 156-156 */
43 char linkname[100]; /* 157-256 */
44 char magic[6]; /* 257-262 */
45 char version[2]; /* 263-264 */
46 char uname[32]; /* 265-296 */
47 char gname[32]; /* 297-328 */
48 char devmajor[8]; /* 329-336 */
49 char devminor[8]; /* 337-344 */
50 char prefix[155]; /* 345-499 */
51 char padding[12]; /* 500-512 */
58 data_align(archive_handle, 512);
60 if (archive_xread(archive_handle, tar.raw, 512) != 512) {
61 /* Assume end of file */
64 archive_handle->offset += 512;
66 /* If there is no filename its an empty header */
67 if (tar.formated.name[0] == 0) {
71 /* Check header has valid magic, "ustar" is for the proper tar
72 * 0's are for the old tar format
74 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
75 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
76 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
78 bb_error_msg_and_die("Invalid tar magic");
80 /* Do checksum on headers */
81 for (i = 0; i < 148 ; i++) {
85 for (i = 156; i < 512 ; i++) {
88 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
89 bb_error_msg("Invalid tar header checksum");
93 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
95 file_header->name = longname;
99 file_header->name = linkname;
103 if (tar.formated.prefix[0] == 0) {
104 file_header->name = strdup(tar.formated.name);
106 file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name);
109 file_header->mode = strtol(tar.formated.mode, NULL, 8);
110 file_header->uid = strtol(tar.formated.uid, NULL, 8);
111 file_header->gid = strtol(tar.formated.gid, NULL, 8);
112 file_header->size = strtol(tar.formated.size, NULL, 8);
113 file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
114 file_header->link_name = (tar.formated.linkname[0] != '\0') ?
115 bb_xstrdup(tar.formated.linkname) : NULL;
116 file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) +
117 strtol(tar.formated.devminor, NULL, 8));
119 /* Fix mode, used by the old format */
120 switch (tar.formated.typeflag) {
121 # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
124 if (last_char_is(file_header->name, '/')) {
125 file_header->mode |= S_IFDIR;
127 file_header->mode |= S_IFREG;
131 file_header->mode |= S_IFLNK;
134 file_header->mode |= S_IFCHR;
137 file_header->mode |= S_IFBLK;
140 file_header->mode |= S_IFDIR;
143 file_header->mode |= S_IFIFO;
146 /* hard links are detected as entries with 0 size, a link name,
147 * and not being a symlink, hence we have nothing to do here */
149 file_header->mode |= ~S_IFLNK;
151 # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
153 longname = xmalloc(file_header->size + 1);
154 archive_xread_all(archive_handle, longname, file_header->size);
155 longname[file_header->size] = '\0';
156 archive_handle->offset += file_header->size;
158 return(get_header_tar(archive_handle));
161 linkname = xmalloc(file_header->size + 1);
162 archive_xread_all(archive_handle, linkname, file_header->size);
163 linkname[file_header->size] = '\0';
164 archive_handle->offset += file_header->size;
166 file_header->name = linkname;
167 return(get_header_tar(archive_handle));
174 bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
178 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
179 archive_handle->action_header(archive_handle->file_header);
180 archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
181 archive_handle->action_data(archive_handle);
182 archive_handle->passed = llist_add_to(archive_handle->passed, file_header->name);
184 data_skip(archive_handle);
186 archive_handle->offset += file_header->size;
188 free(file_header->link_name);
190 return(EXIT_SUCCESS);