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Glenn L McGrath95ebf612001-10-25 14:18:08 +00001/*
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.
6 *
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.
11 *
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.
15 */
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include "unarchive.h"
21#include "libbb.h"
22
Glenn L McGrath21110a02003-01-28 01:45:48 +000023#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
Glenn L McGrathb7a76df2002-11-23 10:44:47 +000024static char *longname = NULL;
25static char *linkname = NULL;
26#endif
27
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000028extern char get_header_tar(archive_handle_t *archive_handle)
Glenn L McGrath95ebf612001-10-25 14:18:08 +000029{
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000030 file_header_t *file_header = archive_handle->file_header;
Glenn L McGrath95ebf612001-10-25 14:18:08 +000031 union {
32 unsigned char raw[512];
33 struct {
Glenn L McGrath99b12542002-08-22 17:47:09 +000034 char name[100]; /* 0-99 */
35 char mode[8]; /* 100-107 */
36 char uid[8]; /* 108-115 */
37 char gid[8]; /* 116-123 */
38 char size[12]; /* 124-135 */
39 char mtime[12]; /* 136-147 */
40 char chksum[8]; /* 148-155 */
41 char typeflag; /* 156-156 */
Glenn L McGrath95ebf612001-10-25 14:18:08 +000042 char linkname[100]; /* 157-256 */
Glenn L McGrath99b12542002-08-22 17:47:09 +000043 char magic[6]; /* 257-262 */
Glenn L McGrath95ebf612001-10-25 14:18:08 +000044 char version[2]; /* 263-264 */
Glenn L McGrath99b12542002-08-22 17:47:09 +000045 char uname[32]; /* 265-296 */
46 char gname[32]; /* 297-328 */
Glenn L McGrath95ebf612001-10-25 14:18:08 +000047 char devmajor[8]; /* 329-336 */
48 char devminor[8]; /* 337-344 */
49 char prefix[155]; /* 345-499 */
50 char padding[12]; /* 500-512 */
51 } formated;
52 } tar;
Glenn L McGrath95ebf612001-10-25 14:18:08 +000053 long sum = 0;
54 long i;
Glenn L McGrathc5c1a8a2002-10-19 06:19:22 +000055 char *tmp;
Glenn L McGrath95ebf612001-10-25 14:18:08 +000056
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000057 /* Align header */
Glenn L McGrath237ae422002-11-03 14:05:15 +000058 data_align(archive_handle, 512);
Glenn L McGrath95ebf612001-10-25 14:18:08 +000059
Glenn L McGrath7f2a9532002-11-05 02:56:57 +000060 if (archive_xread(archive_handle, tar.raw, 512) != 512) {
61 /* Assume end of file */
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000062 return(EXIT_FAILURE);
Glenn L McGrath95ebf612001-10-25 14:18:08 +000063 }
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000064 archive_handle->offset += 512;
65
66 /* If there is no filename its an empty header */
67 if (tar.formated.name[0] == 0) {
68 return(EXIT_SUCCESS);
69 }
Glenn L McGrath95ebf612001-10-25 14:18:08 +000070
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +000071 /* Check header has valid magic, "ustar" is for the proper tar
72 * 0's are for the old tar format
Glenn L McGrath95ebf612001-10-25 14:18:08 +000073 */
74 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
Glenn L McGrath21110a02003-01-28 01:45:48 +000075#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +000076 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
77#endif
Manuel Novoa III cad53642003-03-19 09:13:01 +000078 bb_error_msg_and_die("Invalid tar magic");
Glenn L McGrath95ebf612001-10-25 14:18:08 +000079 }
Glenn L McGrath95ebf612001-10-25 14:18:08 +000080 /* Do checksum on headers */
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000081 for (i = 0; i < 148 ; i++) {
Glenn L McGrath95ebf612001-10-25 14:18:08 +000082 sum += tar.raw[i];
83 }
84 sum += ' ' * 8;
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000085 for (i = 156; i < 512 ; i++) {
Glenn L McGrath95ebf612001-10-25 14:18:08 +000086 sum += tar.raw[i];
87 }
88 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
Manuel Novoa III cad53642003-03-19 09:13:01 +000089 bb_error_msg("Invalid tar header checksum");
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000090 return(EXIT_FAILURE);
Glenn L McGrath95ebf612001-10-25 14:18:08 +000091 }
92
Glenn L McGrath21110a02003-01-28 01:45:48 +000093#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
Glenn L McGrathb7a76df2002-11-23 10:44:47 +000094 if (longname) {
95 file_header->name = longname;
96 longname = NULL;
97 }
98 else if (linkname) {
99 file_header->name = linkname;
100 linkname = NULL;
101 } else
102#endif
Glenn L McGrath75762702002-08-22 11:50:31 +0000103 if (tar.formated.prefix[0] == 0) {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000104 file_header->name = strdup(tar.formated.name);
Glenn L McGrath75762702002-08-22 11:50:31 +0000105 } else {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000106 file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name);
Glenn L McGrath75762702002-08-22 11:50:31 +0000107 }
Glenn L McGrathc5c1a8a2002-10-19 06:19:22 +0000108 tmp = last_char_is(archive_handle->file_header->name, '/');
109 if (tmp) {
110 *tmp = '\0';
111 }
112
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000113 file_header->mode = strtol(tar.formated.mode, NULL, 8);
114 file_header->uid = strtol(tar.formated.uid, NULL, 8);
115 file_header->gid = strtol(tar.formated.gid, NULL, 8);
116 file_header->size = strtol(tar.formated.size, NULL, 8);
117 file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
118 file_header->link_name = (tar.formated.linkname[0] != '\0') ?
Manuel Novoa III cad53642003-03-19 09:13:01 +0000119 bb_xstrdup(tar.formated.linkname) : NULL;
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000120 file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) +
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000121 strtol(tar.formated.devminor, NULL, 8));
122
Glenn L McGrath21110a02003-01-28 01:45:48 +0000123#if defined CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY || defined CONFIG_FEATURE_TAR_GNU_EXTENSIONS
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000124 /* Fix mode, used by the old format */
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +0000125 switch (tar.formated.typeflag) {
Glenn L McGrath21110a02003-01-28 01:45:48 +0000126# ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
Glenn L McGrath99b12542002-08-22 17:47:09 +0000127 case 0:
Glenn L McGrath21110a02003-01-28 01:45:48 +0000128 case '0':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000129 file_header->mode |= S_IFREG;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000130 break;
Glenn L McGrath3d5828f2003-08-14 02:55:15 +0000131#if 0
132 /* hard links are detected as entries with 0 size, a link name,
133 * and not being a symlink, hence we have nothing to do here */
Glenn L McGrath21110a02003-01-28 01:45:48 +0000134 case '1':
Glenn L McGrath3d5828f2003-08-14 02:55:15 +0000135 break;
136#endif
Glenn L McGrath21110a02003-01-28 01:45:48 +0000137 case '2':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000138 file_header->mode |= S_IFLNK;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000139 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000140 case '3':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000141 file_header->mode |= S_IFCHR;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000142 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000143 case '4':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000144 file_header->mode |= S_IFBLK;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000145 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000146 case '5':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000147 file_header->mode |= S_IFDIR;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000148 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000149 case '6':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000150 file_header->mode |= S_IFIFO;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000151 break;
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000152# endif
Glenn L McGrath21110a02003-01-28 01:45:48 +0000153# ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000154 case 'L': {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000155 longname = xmalloc(file_header->size + 1);
Glenn L McGrath237ae422002-11-03 14:05:15 +0000156 archive_xread_all(archive_handle, longname, file_header->size);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000157 longname[file_header->size] = '\0';
158 archive_handle->offset += file_header->size;
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000159
Glenn L McGrathb7a76df2002-11-23 10:44:47 +0000160 return(get_header_tar(archive_handle));
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000161 }
162 case 'K': {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000163 linkname = xmalloc(file_header->size + 1);
Glenn L McGrath237ae422002-11-03 14:05:15 +0000164 archive_xread_all(archive_handle, linkname, file_header->size);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000165 linkname[file_header->size] = '\0';
166 archive_handle->offset += file_header->size;
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000167
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000168 file_header->name = linkname;
Glenn L McGrathb7a76df2002-11-23 10:44:47 +0000169 return(get_header_tar(archive_handle));
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000170 }
Glenn L McGrath21110a02003-01-28 01:45:48 +0000171 case 'D':
172 case 'M':
173 case 'N':
174 case 'S':
175 case 'V':
Manuel Novoa III cad53642003-03-19 09:13:01 +0000176 bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000177# endif
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +0000178 }
179#endif
Glenn L McGrath3d5828f2003-08-14 02:55:15 +0000180
Glenn L McGrath8e940982002-11-04 23:47:31 +0000181 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000182 archive_handle->action_header(archive_handle->file_header);
183 archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
184 archive_handle->action_data(archive_handle);
Glenn L McGrath66125c82002-12-08 00:54:33 +0000185 archive_handle->passed = llist_add_to(archive_handle->passed, archive_handle->file_header->name);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000186 } else {
187 data_skip(archive_handle);
188 }
189 archive_handle->offset += file_header->size;
190
191 return(EXIT_SUCCESS);
Eric Andersen2276d832002-07-11 11:11:56 +0000192}