1 /* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4 * In privileged mode if uname and gname map to a uid and gid then use the
5 * mapped value instead of the uid/gid values in tar header
8 * GNU tar and star man pages,
9 * Opengroup's ustar interchange format,
10 * http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
16 #include <sys/sysmacros.h> /* For makedev */
17 #include "unarchive.h"
20 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
21 static char *longname = NULL;
22 static char *linkname = NULL;
25 char get_header_tar(archive_handle_t *archive_handle)
27 file_header_t *file_header = archive_handle->file_header;
29 /* ustar header, Posix 1003.1 */
30 unsigned char raw[512];
32 char name[100]; /* 0-99 */
33 char mode[8]; /* 100-107 */
34 char uid[8]; /* 108-115 */
35 char gid[8]; /* 116-123 */
36 char size[12]; /* 124-135 */
37 char mtime[12]; /* 136-147 */
38 char chksum[8]; /* 148-155 */
39 char typeflag; /* 156-156 */
40 char linkname[100]; /* 157-256 */
41 char magic[6]; /* 257-262 */
42 char version[2]; /* 263-264 */
43 char uname[32]; /* 265-296 */
44 char gname[32]; /* 297-328 */
45 char devmajor[8]; /* 329-336 */
46 char devminor[8]; /* 337-344 */
47 char prefix[155]; /* 345-499 */
48 char padding[12]; /* 500-512 */
56 data_align(archive_handle, 512);
58 if (bb_full_read(archive_handle->src_fd, tar.raw, 512) != 512) {
59 /* Assume end of file */
60 bb_error_msg_and_die("Short header");
61 //return(EXIT_FAILURE);
63 archive_handle->offset += 512;
65 /* If there is no filename its an empty header */
66 if (tar.formated.name[0] == 0) {
68 /* This is the second consecutive empty header! End of archive!
69 * Read until the end to empty the pipe from gz or bz2
71 while (bb_full_read(archive_handle->src_fd, tar.raw, 512) == 512);
79 /* Check header has valid magic, "ustar" is for the proper tar
80 * 0's are for the old tar format
82 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
83 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY
84 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
86 bb_error_msg_and_die("Invalid tar magic");
88 /* Do checksum on headers */
89 for (i = 0; i < 148 ; i++) {
93 for (i = 156; i < 512 ; i++) {
96 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
97 bb_error_msg("Invalid tar header checksum");
101 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
103 file_header->name = longname;
107 file_header->name = linkname;
112 file_header->name = bb_xstrndup(tar.formated.name,100);
114 if (tar.formated.prefix[0]) {
115 char *temp = file_header->name;
116 file_header->name = concat_path_file(tar.formated.prefix, temp);
121 file_header->uid = strtol(tar.formated.uid, NULL, 8);
122 file_header->gid = strtol(tar.formated.gid, NULL, 8);
123 file_header->size = strtol(tar.formated.size, NULL, 8);
124 file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
125 file_header->link_name = (tar.formated.linkname[0] != '\0') ?
126 bb_xstrdup(tar.formated.linkname) : NULL;
127 file_header->device = makedev(strtol(tar.formated.devmajor, NULL, 8),
128 strtol(tar.formated.devminor, NULL, 8));
130 /* Set bits 0-11 of the files mode */
131 file_header->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
133 /* Set bits 12-15 of the files mode */
134 switch (tar.formated.typeflag) {
135 /* busybox identifies hard links as being regular files with 0 size and a link name */
137 file_header->mode |= S_IFREG;
141 bb_error_msg_and_die("pax is not tar");
144 /* Reserved for high performance files, treat as normal file */
147 #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY
148 if (last_char_is(file_header->name, '/')) {
149 file_header->mode |= S_IFDIR;
152 file_header->mode |= S_IFREG;
155 file_header->mode |= S_IFLNK;
158 file_header->mode |= S_IFCHR;
161 file_header->mode |= S_IFBLK;
164 file_header->mode |= S_IFDIR;
167 file_header->mode |= S_IFIFO;
169 #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
171 longname = xmalloc(file_header->size + 1);
172 archive_xread_all(archive_handle, longname, file_header->size);
173 longname[file_header->size] = '\0';
174 archive_handle->offset += file_header->size;
176 return(get_header_tar(archive_handle));
179 linkname = xmalloc(file_header->size + 1);
180 archive_xread_all(archive_handle, linkname, file_header->size);
181 linkname[file_header->size] = '\0';
182 archive_handle->offset += file_header->size;
184 file_header->name = linkname;
185 return(get_header_tar(archive_handle));
187 case 'D': /* GNU dump dir */
188 case 'M': /* Continuation of multi volume archive*/
189 case 'N': /* Old GNU for names > 100 characters */
190 case 'S': /* Sparse file */
191 case 'V': /* Volume header */
192 bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
195 bb_error_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
197 { /* Strip trailing '/' in directories */
198 /* Must be done after mode is set as '/' is used to check if its a directory */
199 char *tmp = last_char_is(file_header->name, '/');
205 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
206 archive_handle->action_header(archive_handle->file_header);
207 archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
208 archive_handle->action_data(archive_handle);
209 archive_handle->passed = llist_add_to(archive_handle->passed, file_header->name);
211 data_skip(archive_handle);
213 archive_handle->offset += file_header->size;
215 free(file_header->link_name);
217 return(EXIT_SUCCESS);