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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.
Glenn L McGrath6aa52232004-02-17 11:55:06 +000015 *
Glenn L McGrathc9f1fce2004-02-20 02:25:18 +000016 * FIXME:
17 * In privelidged mode if uname and gname map to a uid amd gid then use the
18 * mapped value instead of the uid/gid values in tar header
Glenn L McGrathb0e163a2004-02-19 08:48:30 +000019 *
20 * References:
21 * GNU tar and star man pages,
22 * Opengroup's ustar interchange format,
23 * http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
Glenn L McGrath95ebf612001-10-25 14:18:08 +000024 */
25
26#include <stdio.h>
27#include <stdlib.h>
28#include <string.h>
29#include "unarchive.h"
30#include "libbb.h"
31
Glenn L McGrath21110a02003-01-28 01:45:48 +000032#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
Glenn L McGrathb7a76df2002-11-23 10:44:47 +000033static char *longname = NULL;
34static char *linkname = NULL;
35#endif
36
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000037extern char get_header_tar(archive_handle_t *archive_handle)
Glenn L McGrath95ebf612001-10-25 14:18:08 +000038{
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000039 file_header_t *file_header = archive_handle->file_header;
Glenn L McGrath95ebf612001-10-25 14:18:08 +000040 union {
Glenn L McGrathef91bf62003-09-12 06:31:28 +000041 /* ustar header, Posix 1003.1 */
Glenn L McGrath95ebf612001-10-25 14:18:08 +000042 unsigned char raw[512];
43 struct {
Glenn L McGrath99b12542002-08-22 17:47:09 +000044 char name[100]; /* 0-99 */
45 char mode[8]; /* 100-107 */
46 char uid[8]; /* 108-115 */
47 char gid[8]; /* 116-123 */
48 char size[12]; /* 124-135 */
49 char mtime[12]; /* 136-147 */
50 char chksum[8]; /* 148-155 */
51 char typeflag; /* 156-156 */
Glenn L McGrath95ebf612001-10-25 14:18:08 +000052 char linkname[100]; /* 157-256 */
Glenn L McGrath99b12542002-08-22 17:47:09 +000053 char magic[6]; /* 257-262 */
Glenn L McGrath95ebf612001-10-25 14:18:08 +000054 char version[2]; /* 263-264 */
Glenn L McGrath99b12542002-08-22 17:47:09 +000055 char uname[32]; /* 265-296 */
56 char gname[32]; /* 297-328 */
Glenn L McGrath95ebf612001-10-25 14:18:08 +000057 char devmajor[8]; /* 329-336 */
58 char devminor[8]; /* 337-344 */
59 char prefix[155]; /* 345-499 */
60 char padding[12]; /* 500-512 */
61 } formated;
62 } tar;
Glenn L McGrath95ebf612001-10-25 14:18:08 +000063 long sum = 0;
64 long i;
65
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000066 /* Align header */
Glenn L McGrath237ae422002-11-03 14:05:15 +000067 data_align(archive_handle, 512);
Glenn L McGrath95ebf612001-10-25 14:18:08 +000068
Glenn L McGrath7ffe1332003-11-21 22:24:57 +000069 if (bb_full_read(archive_handle->src_fd, tar.raw, 512) != 512) {
Glenn L McGrath7f2a9532002-11-05 02:56:57 +000070 /* Assume end of file */
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000071 return(EXIT_FAILURE);
Glenn L McGrath95ebf612001-10-25 14:18:08 +000072 }
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000073 archive_handle->offset += 512;
74
75 /* If there is no filename its an empty header */
76 if (tar.formated.name[0] == 0) {
Glenn L McGrathe57feeb2003-11-14 12:57:14 +000077 return(EXIT_SUCCESS);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000078 }
Glenn L McGrath95ebf612001-10-25 14:18:08 +000079
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +000080 /* Check header has valid magic, "ustar" is for the proper tar
81 * 0's are for the old tar format
Glenn L McGrath95ebf612001-10-25 14:18:08 +000082 */
83 if (strncmp(tar.formated.magic, "ustar", 5) != 0) {
Glenn L McGrath21110a02003-01-28 01:45:48 +000084#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +000085 if (strncmp(tar.formated.magic, "\0\0\0\0\0", 5) != 0)
86#endif
Manuel Novoa III cad53642003-03-19 09:13:01 +000087 bb_error_msg_and_die("Invalid tar magic");
Glenn L McGrath95ebf612001-10-25 14:18:08 +000088 }
Glenn L McGrath95ebf612001-10-25 14:18:08 +000089 /* Do checksum on headers */
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000090 for (i = 0; i < 148 ; i++) {
Glenn L McGrath95ebf612001-10-25 14:18:08 +000091 sum += tar.raw[i];
92 }
93 sum += ' ' * 8;
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000094 for (i = 156; i < 512 ; i++) {
Glenn L McGrath95ebf612001-10-25 14:18:08 +000095 sum += tar.raw[i];
96 }
97 if (sum != strtol(tar.formated.chksum, NULL, 8)) {
Manuel Novoa III cad53642003-03-19 09:13:01 +000098 bb_error_msg("Invalid tar header checksum");
Glenn L McGrath7ca04f32002-09-25 02:47:48 +000099 return(EXIT_FAILURE);
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000100 }
101
Glenn L McGrath21110a02003-01-28 01:45:48 +0000102#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
Glenn L McGrathb7a76df2002-11-23 10:44:47 +0000103 if (longname) {
104 file_header->name = longname;
105 longname = NULL;
106 }
107 else if (linkname) {
108 file_header->name = linkname;
109 linkname = NULL;
110 } else
111#endif
Glenn L McGrath75762702002-08-22 11:50:31 +0000112 if (tar.formated.prefix[0] == 0) {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000113 file_header->name = strdup(tar.formated.name);
Glenn L McGrath75762702002-08-22 11:50:31 +0000114 } else {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000115 file_header->name = concat_path_file(tar.formated.prefix, tar.formated.name);
Glenn L McGrath75762702002-08-22 11:50:31 +0000116 }
Glenn L McGrathc5c1a8a2002-10-19 06:19:22 +0000117
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000118 file_header->mode = strtol(tar.formated.mode, NULL, 8);
119 file_header->uid = strtol(tar.formated.uid, NULL, 8);
120 file_header->gid = strtol(tar.formated.gid, NULL, 8);
121 file_header->size = strtol(tar.formated.size, NULL, 8);
122 file_header->mtime = strtol(tar.formated.mtime, NULL, 8);
123 file_header->link_name = (tar.formated.linkname[0] != '\0') ?
Manuel Novoa III cad53642003-03-19 09:13:01 +0000124 bb_xstrdup(tar.formated.linkname) : NULL;
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000125 file_header->device = (dev_t) ((strtol(tar.formated.devmajor, NULL, 8) << 8) +
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000126 strtol(tar.formated.devminor, NULL, 8));
127
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000128 /* Fix mode, used by the old format */
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +0000129 switch (tar.formated.typeflag) {
Glenn L McGrathb0e163a2004-02-19 08:48:30 +0000130 /* busybox identifies hard links as being regular files with 0 size and a link name */
131 case '1':
132 file_header->mode &= (S_IFREG | 07777);
133 break;
134 case 'x':
135 case 'g':
136 bb_error_msg_and_die("pax is not tar");
137 break;
Glenn L McGrathc9f1fce2004-02-20 02:25:18 +0000138 case '7':
139 /* Reserved for high performance files, treat as normal file */
Glenn L McGrath99b12542002-08-22 17:47:09 +0000140 case 0:
Glenn L McGrath21110a02003-01-28 01:45:48 +0000141 case '0':
Glenn L McGrathc9f1fce2004-02-20 02:25:18 +0000142#ifdef CONFIG_FEATURE_TAR_OLDGNU_COMPATABILITY
Glenn L McGrath87af49f2003-09-09 17:41:03 +0000143 if (last_char_is(file_header->name, '/')) {
144 file_header->mode |= S_IFDIR;
Glenn L McGrathc9f1fce2004-02-20 02:25:18 +0000145 } else
146#endif
Glenn L McGrath87af49f2003-09-09 17:41:03 +0000147 file_header->mode |= S_IFREG;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000148 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000149 case '2':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000150 file_header->mode |= S_IFLNK;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000151 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000152 case '3':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000153 file_header->mode |= S_IFCHR;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000154 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000155 case '4':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000156 file_header->mode |= S_IFBLK;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000157 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000158 case '5':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000159 file_header->mode |= S_IFDIR;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000160 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000161 case '6':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000162 file_header->mode |= S_IFIFO;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000163 break;
Glenn L McGrath6aa52232004-02-17 11:55:06 +0000164#ifdef CONFIG_FEATURE_TAR_GNU_EXTENSIONS
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000165 case 'L': {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000166 longname = xmalloc(file_header->size + 1);
Glenn L McGrath237ae422002-11-03 14:05:15 +0000167 archive_xread_all(archive_handle, longname, file_header->size);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000168 longname[file_header->size] = '\0';
169 archive_handle->offset += file_header->size;
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000170
Glenn L McGrathb7a76df2002-11-23 10:44:47 +0000171 return(get_header_tar(archive_handle));
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000172 }
173 case 'K': {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000174 linkname = xmalloc(file_header->size + 1);
Glenn L McGrath237ae422002-11-03 14:05:15 +0000175 archive_xread_all(archive_handle, linkname, file_header->size);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000176 linkname[file_header->size] = '\0';
177 archive_handle->offset += file_header->size;
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000178
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000179 file_header->name = linkname;
Glenn L McGrathb7a76df2002-11-23 10:44:47 +0000180 return(get_header_tar(archive_handle));
Glenn L McGrathb3c4e9a2002-09-15 16:54:49 +0000181 }
Glenn L McGrathb0e163a2004-02-19 08:48:30 +0000182 case 'D': /* GNU dump dir */
183 case 'M': /* Continuation of multi volume archive*/
184 case 'N': /* Old GNU for names > 100 characters */
185 case 'S': /* Sparse file */
186 case 'V': /* Volume header */
Manuel Novoa III cad53642003-03-19 09:13:01 +0000187 bb_error_msg("Ignoring GNU extension type %c", tar.formated.typeflag);
Glenn L McGrath6aa52232004-02-17 11:55:06 +0000188#endif
Glenn L McGrathb0e163a2004-02-19 08:48:30 +0000189 default:
190 bb_error_msg("Unknown typeflag: 0x%x", tar.formated.typeflag);
Glenn L McGrath6aa52232004-02-17 11:55:06 +0000191 }
192 { /* Strip trailing '/' in directories */
193 /* Must be done after mode is set as '/' is used to check if its a directory */
194 char *tmp = last_char_is(file_header->name, '/');
195 if (tmp) {
196 *tmp = '\0';
197 }
Glenn L McGrath1d23f3a2002-08-13 05:06:43 +0000198 }
Glenn L McGrath3d5828f2003-08-14 02:55:15 +0000199
Glenn L McGrath8e940982002-11-04 23:47:31 +0000200 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000201 archive_handle->action_header(archive_handle->file_header);
202 archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
203 archive_handle->action_data(archive_handle);
Glenn L McGrathf074afc2003-11-17 21:58:00 +0000204 archive_handle->passed = llist_add_to(archive_handle->passed, file_header->name);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000205 } else {
206 data_skip(archive_handle);
207 }
208 archive_handle->offset += file_header->size;
209
Glenn L McGrath54ac0572003-11-15 00:24:43 +0000210 free(file_header->link_name);
211
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000212 return(EXIT_SUCCESS);
Eric Andersen2276d832002-07-11 11:11:56 +0000213}