226 lines
6.5 KiB
C
226 lines
6.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* FIXME:
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* In privileged mode if uname and gname map to a uid and gid then use the
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* mapped value instead of the uid/gid values in tar header
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*
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* References:
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* GNU tar and star man pages,
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* Opengroup's ustar interchange format,
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* http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "unarchive.h"
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#include "libbb.h"
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#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
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static char *longname = NULL;
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static char *linkname = NULL;
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#endif
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extern char get_header_tar(archive_handle_t *archive_handle)
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{
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file_header_t *file_header = archive_handle->file_header;
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union {
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/* ustar header, Posix 1003.1 */
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unsigned char raw[512];
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struct {
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char name[100]; /* 0-99 */
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char mode[8]; /* 100-107 */
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char uid[8]; /* 108-115 */
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char gid[8]; /* 116-123 */
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char size[12]; /* 124-135 */
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char mtime[12]; /* 136-147 */
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char chksum[8]; /* 148-155 */
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char typeflag; /* 156-156 */
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char linkname[100]; /* 157-256 */
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char magic[6]; /* 257-262 */
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char version[2]; /* 263-264 */
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char uname[32]; /* 265-296 */
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char gname[32]; /* 297-328 */
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char devmajor[8]; /* 329-336 */
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char devminor[8]; /* 337-344 */
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char prefix[155]; /* 345-499 */
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char padding[12]; /* 500-512 */
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} formated;
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} tar;
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long sum = 0;
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long i;
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static int end = 0;
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/* Align header */
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data_align(archive_handle, 512);
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if (bb_full_read(archive_handle->src_fd, tar.raw, 512) != 512) {
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/* Assume end of file */
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return(EXIT_FAILURE);
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}
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archive_handle->offset += 512;
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/* If there is no filename its an empty header */
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if (tar.formated.name[0] == 0) {
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if (end) {
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/* This is the second consecutive empty header! End of archive!
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* Read until the end to empty the pipe from gz or bz2
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*/
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while (bb_full_read(archive_handle->src_fd, tar.raw, 512) == 512);
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return(EXIT_FAILURE);
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}
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end = 1;
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return(EXIT_SUCCESS);
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}
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end = 0;
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/* Check header has valid magic, "ustar" is for the proper tar
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* 0's are for the old tar format
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*/
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if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
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#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
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if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
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#endif
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bb_error_msg_and_die("Invalid tar magic");
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}
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/* Do checksum on headers */
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for (i = 0; i < 148 ; i++) {
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sum += tar.raw[i];
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}
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sum += ' ' * 8;
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for (i = 156; i < 512 ; i++) {
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sum += tar.raw[i];
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}
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if (sum != strtol(tar.formated.chksum, NULL, 8)) {
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bb_error_msg("Invalid tar header checksum");
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return(EXIT_FAILURE);
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}
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#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
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if (longname) {
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file_header->name = longname;
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longname = NULL;
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}
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else if (linkname) {
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file_header->name = linkname;
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linkname = NULL;
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} else
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#endif
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if (tar.formated.prefix[0] == 0) {
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file_header->name = strdup(tar.formated.name);
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} else {
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file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name);
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}
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file_header->uid = strtol(tar.formated.uid, NULL, 8);
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file_header->gid = strtol(tar.formated.gid, NULL, 8);
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file_header->size = strtol(tar.formated.size, NULL, 8);
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file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
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file_header->link_name = (tar.formated.linkname[0] != '\0') ?
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bb_xstrdup(tar.formated.linkname) : NULL;
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file_header->device = makedev(strtol(tar.formated.devmajor, NULL, 8),
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strtol(tar.formated.devminor, NULL, 8));
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/* Set bits 0-11 of the files mode */
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file_header->mode = 07777 & strtol(tar.formated.mode, NULL, 8);
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/* Set bits 12-15 of the files mode */
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switch (tar.formated.typeflag) {
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/* busybox identifies hard links as being regular files with 0 size and a link name */
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case '1':
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file_header->mode |= S_IFREG;
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break;
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case 'x':
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case 'g':
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bb_error_msg_and_die("pax is not tar");
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break;
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case '7':
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/* Reserved for high performance files, treat as normal file */
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case 0:
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case '0':
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#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
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if (last_char_is(file_header->name, '/')) {
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file_header->mode |= S_IFDIR;
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} else
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#endif
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file_header->mode |= S_IFREG;
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break;
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case '2':
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file_header->mode |= S_IFLNK;
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break;
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case '3':
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file_header->mode |= S_IFCHR;
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break;
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case '4':
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file_header->mode |= S_IFBLK;
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break;
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case '5':
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file_header->mode |= S_IFDIR;
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break;
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case '6':
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file_header->mode |= S_IFIFO;
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break;
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#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
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case 'L': {
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longname = xmalloc(file_header->size + 1);
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archive_xread_all(archive_handle, longname, file_header->size);
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longname[file_header->size] = '\0';
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archive_handle->offset += file_header->size;
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return(get_header_tar(archive_handle));
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}
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case 'K': {
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linkname = xmalloc(file_header->size + 1);
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archive_xread_all(archive_handle, linkname, file_header->size);
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linkname[file_header->size] = '\0';
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archive_handle->offset += file_header->size;
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file_header->name = linkname;
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return(get_header_tar(archive_handle));
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}
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case 'D': /* GNU dump dir */
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case 'M': /* Continuation of multi volume archive*/
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case 'N': /* Old GNU for names > 100 characters */
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case 'S': /* Sparse file */
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case 'V': /* Volume header */
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bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
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#endif
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default:
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bb_error_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
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}
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{ /* Strip trailing '/' in directories */
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/* Must be done after mode is set as '/' is used to check if its a directory */
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char *tmp = last_char_is(file_header->name, '/');
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if (tmp) {
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*tmp = '\0';
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}
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}
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if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
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archive_handle->action_header(archive_handle->file_header);
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archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
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archive_handle->action_data(archive_handle);
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archive_handle->passed = llist_add_to(archive_handle->passed, file_header->name);
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} else {
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data_skip(archive_handle);
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}
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archive_handle->offset += file_header->size;
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free(file_header->link_name);
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return(EXIT_SUCCESS);
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}
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