| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "unarchive.h" |
| #include "libbb.h" |
| |
| #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS |
| static char *longname = NULL; |
| static char *linkname = NULL; |
| #endif |
| |
| extern char get_header_tar(archive_handle_t *archive_handle) |
| { |
| file_header_t *file_header = archive_handle->file_header; |
| union { |
| /* ustar header, Posix 1003.1 */ |
| unsigned char raw[512]; |
| struct { |
| char name[100]; /* 0-99 */ |
| char mode[8]; /* 100-107 */ |
| char uid[8]; /* 108-115 */ |
| char gid[8]; /* 116-123 */ |
| char size[12]; /* 124-135 */ |
| char mtime[12]; /* 136-147 */ |
| char chksum[8]; /* 148-155 */ |
| char typeflag; /* 156-156 */ |
| char linkname[100]; /* 157-256 */ |
| char magic[6]; /* 257-262 */ |
| char version[2]; /* 263-264 */ |
| char uname[32]; /* 265-296 */ |
| char gname[32]; /* 297-328 */ |
| char devmajor[8]; /* 329-336 */ |
| char devminor[8]; /* 337-344 */ |
| char prefix[155]; /* 345-499 */ |
| char padding[12]; /* 500-512 */ |
| } formated; |
| } tar; |
| long sum = 0; |
| long i; |
| |
| /* Align header */ |
| data_align(archive_handle, 512); |
| |
| if (archive_xread(archive_handle, tar.raw, 512) != 512) { |
| /* Assume end of file */ |
| return(EXIT_FAILURE); |
| } |
| archive_handle->offset += 512; |
| |
| /* If there is no filename its an empty header */ |
| if (tar.formated.name[0] == 0) { |
| return(EXIT_SUCCESS); |
| } |
| |
| /* Check header has valid magic, "ustar" is for the proper tar |
| * 0's are for the old tar format |
| */ |
| if (strncmp(tar.formated.magic, "ustar", 5) != 0) { |
| #ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY |
| if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0) |
| #endif |
| bb_error_msg_and_die("Invalid tar magic"); |
| } |
| /* Do checksum on headers */ |
| for (i = 0; i < 148 ; i++) { |
| sum += tar.raw[i]; |
| } |
| sum += ' ' * 8; |
| for (i = 156; i < 512 ; i++) { |
| sum += tar.raw[i]; |
| } |
| if (sum != strtol(tar.formated.chksum, NULL, 8)) { |
| bb_error_msg("Invalid tar header checksum"); |
| return(EXIT_FAILURE); |
| } |
| |
| #ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS |
| if (longname) { |
| file_header->name = longname; |
| longname = NULL; |
| } |
| else if (linkname) { |
| file_header->name = linkname; |
| linkname = NULL; |
| } else |
| #endif |
| if (tar.formated.prefix[0] == 0) { |
| file_header->name = strdup(tar.formated.name); |
| } else { |
| file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name); |
| } |
| |
| { /* Strip trailing '/' in directories */ |
| char *tmp = last_char_is(file_header->name, '/'); |
| if (tmp) { |
| *tmp = '\0'; |
| } |
| } |
| |
| |
| file_header->mode = strtol(tar.formated.mode, NULL, 8); |
| file_header->uid = strtol(tar.formated.uid, NULL, 8); |
| file_header->gid = strtol(tar.formated.gid, NULL, 8); |
| file_header->size = strtol(tar.formated.size, NULL, 8); |
| file_header->mtime = strtol(tar.formated.mtime, NULL, 8); |
| file_header->link_name = (tar.formated.linkname[0] != '\0') ? |
| bb_xstrdup(tar.formated.linkname) : NULL; |
| file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) + |
| strtol(tar.formated.devminor, NULL, 8)); |
| |
| /* Fix mode, used by the old format */ |
| switch (tar.formated.typeflag) { |
| # ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY |
| case 0: |
| case '0': |
| if (last_char_is(file_header->name, '/')) { |
| file_header->mode |= S_IFDIR; |
| } else { |
| file_header->mode |= S_IFREG; |
| } |
| break; |
| case '2': |
| file_header->mode |= S_IFLNK; |
| break; |
| case '3': |
| file_header->mode |= S_IFCHR; |
| break; |
| case '4': |
| file_header->mode |= S_IFBLK; |
| break; |
| case '5': |
| file_header->mode |= S_IFDIR; |
| break; |
| case '6': |
| file_header->mode |= S_IFIFO; |
| break; |
| # endif |
| /* hard links are detected as entries with 0 size, a link name, |
| * and not being a symlink, hence we have nothing to do here */ |
| case '1': |
| file_header->mode |= ~S_IFLNK; |
| break; |
| # ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS |
| case 'L': { |
| longname = xmalloc(file_header->size + 1); |
| archive_xread_all(archive_handle, longname, file_header->size); |
| longname[file_header->size] = '\0'; |
| archive_handle->offset += file_header->size; |
| |
| return(get_header_tar(archive_handle)); |
| } |
| case 'K': { |
| linkname = xmalloc(file_header->size + 1); |
| archive_xread_all(archive_handle, linkname, file_header->size); |
| linkname[file_header->size] = '\0'; |
| archive_handle->offset += file_header->size; |
| |
| file_header->name = linkname; |
| return(get_header_tar(archive_handle)); |
| } |
| case 'D': |
| case 'M': |
| case 'N': |
| case 'S': |
| case 'V': |
| bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag); |
| # endif |
| } |
| |
| if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) { |
| archive_handle->action_header(archive_handle->file_header); |
| archive_handle->flags |= ARCHIVE_EXTRACT_QUIET; |
| archive_handle->action_data(archive_handle); |
| archive_handle->passed = llist_add_to(archive_handle->passed, file_header->name); |
| } else { |
| data_skip(archive_handle); |
| } |
| archive_handle->offset += file_header->size; |
| |
| free(file_header->link_name); |
| |
| return(EXIT_SUCCESS); |
| } |