[821] | 1 | /* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
| 2 | *
|
---|
| 3 | * FIXME:
|
---|
| 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
|
---|
| 6 | *
|
---|
| 7 | * References:
|
---|
| 8 | * GNU tar and star man pages,
|
---|
| 9 | * Opengroup's ustar interchange format,
|
---|
| 10 | * http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
|
---|
| 11 | */
|
---|
| 12 |
|
---|
| 13 | #include <stdio.h>
|
---|
| 14 | #include <stdlib.h>
|
---|
| 15 | #include <string.h>
|
---|
| 16 | #include <sys/sysmacros.h> /* For makedev */
|
---|
| 17 | #include "unarchive.h"
|
---|
| 18 | #include "libbb.h"
|
---|
| 19 |
|
---|
| 20 | #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
|
---|
| 21 | static char *longname = NULL;
|
---|
| 22 | static char *linkname = NULL;
|
---|
| 23 | #endif
|
---|
| 24 |
|
---|
| 25 | char get_header_tar(archive_handle_t *archive_handle)
|
---|
| 26 | {
|
---|
| 27 | file_header_t *file_header = archive_handle->file_header;
|
---|
| 28 | union {
|
---|
| 29 | /* ustar header, Posix 1003.1 */
|
---|
| 30 | unsigned char raw[512];
|
---|
| 31 | struct {
|
---|
| 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 */
|
---|
| 49 | } formated;
|
---|
| 50 | } tar;
|
---|
| 51 | long sum = 0;
|
---|
| 52 | long i;
|
---|
| 53 | static int end = 0;
|
---|
| 54 |
|
---|
| 55 | /* Align header */
|
---|
| 56 | data_align(archive_handle, 512);
|
---|
| 57 |
|
---|
| 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);
|
---|
| 62 | }
|
---|
| 63 | archive_handle->offset += 512;
|
---|
| 64 |
|
---|
| 65 | /* If there is no filename its an empty header */
|
---|
| 66 | if (tar.formated.name[0] == 0) {
|
---|
| 67 | if (end) {
|
---|
| 68 | /* This is the second consecutive empty header! End of archive!
|
---|
| 69 | * Read until the end to empty the pipe from gz or bz2
|
---|
| 70 | */
|
---|
| 71 | while (bb_full_read(archive_handle->src_fd, tar.raw, 512) == 512);
|
---|
| 72 | return(EXIT_FAILURE);
|
---|
| 73 | }
|
---|
| 74 | end = 1;
|
---|
| 75 | return(EXIT_SUCCESS);
|
---|
| 76 | }
|
---|
| 77 | end = 0;
|
---|
| 78 |
|
---|
| 79 | /* Check header has valid magic, "ustar" is for the proper tar
|
---|
| 80 | * 0's are for the old tar format
|
---|
| 81 | */
|
---|
| 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)
|
---|
| 85 | #endif
|
---|
| 86 | bb_error_msg_and_die("Invalid tar magic");
|
---|
| 87 | }
|
---|
| 88 | /* Do checksum on headers */
|
---|
| 89 | for (i = 0; i < 148 ; i++) {
|
---|
| 90 | sum += tar.raw[i];
|
---|
| 91 | }
|
---|
| 92 | sum += ' ' * 8;
|
---|
| 93 | for (i = 156; i < 512 ; i++) {
|
---|
| 94 | sum += tar.raw[i];
|
---|
| 95 | }
|
---|
| 96 | if (sum != strtol(tar.formated.chksum, NULL, 8)) {
|
---|
| 97 | bb_error_msg("Invalid tar header checksum");
|
---|
| 98 | return(EXIT_FAILURE);
|
---|
| 99 | }
|
---|
| 100 |
|
---|
| 101 | #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
|
---|
| 102 | if (longname) {
|
---|
| 103 | file_header->name = longname;
|
---|
| 104 | longname = NULL;
|
---|
| 105 | }
|
---|
| 106 | else if (linkname) {
|
---|
| 107 | file_header->name = linkname;
|
---|
| 108 | linkname = NULL;
|
---|
| 109 | } else
|
---|
| 110 | #endif
|
---|
| 111 | {
|
---|
| 112 | file_header->name = bb_xstrndup(tar.formated.name,100);
|
---|
| 113 |
|
---|
| 114 | if (tar.formated.prefix[0]) {
|
---|
| 115 | char *temp = file_header->name;
|
---|
| 116 | file_header->name = concat_path_file(tar.formated.prefix, temp);
|
---|
| 117 | free(temp);
|
---|
| 118 | }
|
---|
| 119 | }
|
---|
| 120 |
|
---|
| 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));
|
---|
| 129 |
|
---|
| 130 | /* Set bits 0-11 of the files mode */
|
---|
| 131 | file_header->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
|
---|
| 132 |
|
---|
| 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 */
|
---|
| 136 | case '1':
|
---|
| 137 | file_header->mode |= S_IFREG;
|
---|
| 138 | break;
|
---|
| 139 | case '7':
|
---|
| 140 | /* Reserved for high performance files, treat as normal file */
|
---|
| 141 | case 0:
|
---|
| 142 | case '0':
|
---|
| 143 | #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATIBILITY
|
---|
| 144 | if (last_char_is(file_header->name, '/')) {
|
---|
| 145 | file_header->mode |= S_IFDIR;
|
---|
| 146 | } else
|
---|
| 147 | #endif
|
---|
| 148 | file_header->mode |= S_IFREG;
|
---|
| 149 | break;
|
---|
| 150 | case '2':
|
---|
| 151 | file_header->mode |= S_IFLNK;
|
---|
| 152 | break;
|
---|
| 153 | case '3':
|
---|
| 154 | file_header->mode |= S_IFCHR;
|
---|
| 155 | break;
|
---|
| 156 | case '4':
|
---|
| 157 | file_header->mode |= S_IFBLK;
|
---|
| 158 | break;
|
---|
| 159 | case '5':
|
---|
| 160 | file_header->mode |= S_IFDIR;
|
---|
| 161 | break;
|
---|
| 162 | case '6':
|
---|
| 163 | file_header->mode |= S_IFIFO;
|
---|
| 164 | break;
|
---|
| 165 | #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
|
---|
| 166 | case 'L': {
|
---|
| 167 | longname = xzalloc(file_header->size + 1);
|
---|
| 168 | archive_xread_all(archive_handle, longname, file_header->size);
|
---|
| 169 | archive_handle->offset += file_header->size;
|
---|
| 170 |
|
---|
| 171 | return(get_header_tar(archive_handle));
|
---|
| 172 | }
|
---|
| 173 | case 'K': {
|
---|
| 174 | linkname = xzalloc(file_header->size + 1);
|
---|
| 175 | archive_xread_all(archive_handle, linkname, file_header->size);
|
---|
| 176 | archive_handle->offset += file_header->size;
|
---|
| 177 |
|
---|
| 178 | file_header->name = linkname;
|
---|
| 179 | return(get_header_tar(archive_handle));
|
---|
| 180 | }
|
---|
| 181 | case 'D': /* GNU dump dir */
|
---|
| 182 | case 'M': /* Continuation of multi volume archive*/
|
---|
| 183 | case 'N': /* Old GNU for names > 100 characters */
|
---|
| 184 | case 'S': /* Sparse file */
|
---|
| 185 | case 'V': /* Volume header */
|
---|
| 186 | #endif
|
---|
| 187 | case 'g': /* pax global header */
|
---|
| 188 | case 'x': /* pax extended header */
|
---|
| 189 | bb_error_msg("Ignoring extension type %c", tar.formated.typeflag);
|
---|
| 190 | break;
|
---|
| 191 | default:
|
---|
| 192 | bb_error_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
|
---|
| 193 | }
|
---|
| 194 | { /* Strip trailing '/' in directories */
|
---|
| 195 | /* Must be done after mode is set as '/' is used to check if its a directory */
|
---|
| 196 | char *tmp = last_char_is(file_header->name, '/');
|
---|
| 197 | if (tmp) {
|
---|
| 198 | *tmp = '\0';
|
---|
| 199 | }
|
---|
| 200 | }
|
---|
| 201 |
|
---|
| 202 | if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
|
---|
| 203 | archive_handle->action_header(archive_handle->file_header);
|
---|
| 204 | archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
|
---|
| 205 | archive_handle->action_data(archive_handle);
|
---|
| 206 | llist_add_to(&(archive_handle->passed), file_header->name);
|
---|
| 207 | } else {
|
---|
| 208 | data_skip(archive_handle);
|
---|
| 209 | }
|
---|
| 210 | archive_handle->offset += file_header->size;
|
---|
| 211 |
|
---|
| 212 | free(file_header->link_name);
|
---|
| 213 |
|
---|
| 214 | return(EXIT_SUCCESS);
|
---|
| 215 | }
|
---|