blob: af0e4f8efa0153b3e14599f5e4873670e07b0dc3 [file] [log] [blame]
Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersencc8ed391999-10-05 16:24:54 +00002/*
Erik Andersen6acaa402000-03-26 14:03:20 +00003 *
4 * Mini tar implementation for busybox Note, that as of BusyBox 0.43 tar has
5 * been completely rewritten from the ground up. It still has remnents of the
6 * old code lying about, but it pretty different (i.e. cleaner, less global
7 * variables, etc)
Eric Andersenc4996011999-10-20 22:08:37 +00008 *
Erik Andersen1ad302a2000-03-24 00:54:46 +00009 * Copyright (C) 1999 by Lineo, inc.
10 * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
Eric Andersen96bcfd31999-11-12 01:30:18 +000011 *
Erik Andersen6acaa402000-03-26 14:03:20 +000012 * Based in part in the tar implementation in sash
13 * Copyright (c) 1999 by David I. Bell
14 * Permission is granted to use, distribute, or modify this source,
15 * provided that this copyright notice remains intact.
16 * Permission to distribute sash derived code under the GPL has been granted.
17 *
18 * Based in part on the tar implementation in busybox-0.28
19 * Copyright (C) 1995 Bruce Perens
20 * This is free software under the GNU General Public License.
21 *
Eric Andersenc4996011999-10-20 22:08:37 +000022 * This program is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation; either version 2 of the License, or
25 * (at your option) any later version.
26 *
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30 * General Public License for more details.
31 *
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 *
Eric Andersencc8ed391999-10-05 16:24:54 +000036 */
37
38
39#include "internal.h"
Erik Andersen1ad302a2000-03-24 00:54:46 +000040#define BB_DECLARE_EXTERN
41#define bb_need_io_error
42#include "messages.c"
Eric Andersencc8ed391999-10-05 16:24:54 +000043#include <stdio.h>
44#include <dirent.h>
45#include <errno.h>
46#include <fcntl.h>
47#include <signal.h>
48#include <time.h>
Erik Andersen7dc16072000-01-04 01:10:25 +000049#include <utime.h>
Eric Andersen96bcfd31999-11-12 01:30:18 +000050#include <sys/types.h>
Eric Andersen08b10341999-11-19 02:38:58 +000051#include <sys/sysmacros.h>
Erik Andersene49d5ec2000-02-08 19:58:47 +000052#include <sys/param.h> /* for PATH_MAX */
Eric Andersencc8ed391999-10-05 16:24:54 +000053
Eric Andersene77ae3a1999-10-19 20:03:34 +000054
Erik Andersen05100cd2000-01-16 01:30:52 +000055#ifdef BB_FEATURE_TAR_CREATE
56
Eric Andersene77ae3a1999-10-19 20:03:34 +000057static const char tar_usage[] =
Erik Andersene49d5ec2000-02-08 19:58:47 +000058 "tar -[cxtvOf] [tarFileName] [FILE] ...\n\n"
59 "Create, extract, or list files from a tar file.\n\n"
60 "Options:\n"
61
62 "\tc=create, x=extract, t=list contents, v=verbose,\n"
63 "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
Eric Andersene77ae3a1999-10-19 20:03:34 +000064
Erik Andersen05100cd2000-01-16 01:30:52 +000065#else
66
67static const char tar_usage[] =
Erik Andersene49d5ec2000-02-08 19:58:47 +000068 "tar -[xtvOf] [tarFileName] [FILE] ...\n\n"
69 "Extract, or list files stored in a tar file. This\n"
70 "version of tar does not support creation of tar files.\n\n"
71 "Options:\n"
72
73 "\tx=extract, t=list contents, v=verbose,\n"
74 "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
Erik Andersen05100cd2000-01-16 01:30:52 +000075
76#endif
Eric Andersene77ae3a1999-10-19 20:03:34 +000077
78
Erik Andersen298854f2000-03-23 01:09:18 +000079/* Tar file constants */
Erik Andersen1ad302a2000-03-24 00:54:46 +000080#ifndef MAJOR
81#define MAJOR(dev) (((dev)>>8)&0xff)
82#define MINOR(dev) ((dev)&0xff)
83#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000084
85
Erik Andersen298854f2000-03-23 01:09:18 +000086/* POSIX tar Header Block, from POSIX 1003.1-1990 */
87struct TarHeader
88{
89 /* byte offset */
90 char name[100]; /* 0 */
91 char mode[8]; /* 100 */
92 char uid[8]; /* 108 */
93 char gid[8]; /* 116 */
94 char size[12]; /* 124 */
95 char mtime[12]; /* 136 */
96 char chksum[8]; /* 148 */
97 char typeflag; /* 156 */
98 char linkname[100]; /* 157 */
99 char magic[6]; /* 257 */
100 char version[2]; /* 263 */
101 char uname[32]; /* 265 */
102 char gname[32]; /* 297 */
103 char devmajor[8]; /* 329 */
104 char devminor[8]; /* 337 */
105 char prefix[155]; /* 345 */
106 /* padding 500 */
107};
108typedef struct TarHeader TarHeader;
Eric Andersencc8ed391999-10-05 16:24:54 +0000109
Eric Andersencc8ed391999-10-05 16:24:54 +0000110
Erik Andersen298854f2000-03-23 01:09:18 +0000111/* A few useful constants */
112#define TAR_MAGIC "ustar" /* ustar and a null */
113#define TAR_VERSION "00" /* 00 and no null */
114#define TAR_MAGIC_LEN 6
115#define TAR_VERSION_LEN 2
116#define TAR_NAME_LEN 100
117#define TAR_BLOCK_SIZE 512
118
119/* A nice enum with all the possible tar file content types */
120enum TarFileType
121{
122 REGTYPE = '0', /* regular file */
123 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
124 LNKTYPE = '1', /* hard link */
125 SYMTYPE = '2', /* symbolic link */
126 CHRTYPE = '3', /* character special */
127 BLKTYPE = '4', /* block special */
128 DIRTYPE = '5', /* directory */
129 FIFOTYPE = '6', /* FIFO special */
130 CONTTYPE = '7', /* reserved */
131};
132typedef enum TarFileType TarFileType;
133
134/* This struct ignores magic, non-numeric user name,
135 * non-numeric group name, and the checksum, since
136 * these are all ignored by BusyBox tar. */
137struct TarInfo
138{
139 int tarFd; /* An open file descriptor for reading from the tarball */
140 char * name; /* File name */
141 mode_t mode; /* Unix mode, including device bits. */
142 uid_t uid; /* Numeric UID */
143 gid_t gid; /* Numeric GID */
144 size_t size; /* Size of file */
145 time_t mtime; /* Last-modified time */
146 enum TarFileType type; /* Regular, directory, link, etc */
147 char * linkname; /* Name for symbolic and hard links */
Erik Andersen1ad302a2000-03-24 00:54:46 +0000148 long devmajor; /* Major number for special device */
149 long devminor; /* Minor number for special device */
Erik Andersen298854f2000-03-23 01:09:18 +0000150};
151typedef struct TarInfo TarInfo;
152
153/* Static data */
154static const unsigned long TarChecksumOffset = (const unsigned long)&(((TarHeader *)0)->chksum);
Eric Andersencc8ed391999-10-05 16:24:54 +0000155
156
Erik Andersene454fb62000-03-23 04:27:58 +0000157/* Local procedures to restore files from a tar file. */
Erik Andersen298854f2000-03-23 01:09:18 +0000158static int readTarFile(const char* tarName, int extractFlag, int listFlag,
159 int tostdoutFlag, int verboseFlag);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000160
161
Eric Andersencc8ed391999-10-05 16:24:54 +0000162
Erik Andersen05100cd2000-01-16 01:30:52 +0000163#ifdef BB_FEATURE_TAR_CREATE
Erik Andersen6acaa402000-03-26 14:03:20 +0000164/* Local procedures to save files into a tar file. */
165static int writeTarFile(const char* tarName, int extractFlag, int listFlag,
166 int tostdoutFlag, int verboseFlag, int argc, char **argv);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000167static int putOctal(char *cp, int len, long value);
Eric Andersencc8ed391999-10-05 16:24:54 +0000168
Erik Andersen05100cd2000-01-16 01:30:52 +0000169#endif
170
Eric Andersencc8ed391999-10-05 16:24:54 +0000171
Erik Andersene49d5ec2000-02-08 19:58:47 +0000172extern int tar_main(int argc, char **argv)
Eric Andersencc8ed391999-10-05 16:24:54 +0000173{
Erik Andersen298854f2000-03-23 01:09:18 +0000174 const char *tarName=NULL;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000175 const char *options;
Erik Andersen298854f2000-03-23 01:09:18 +0000176 int listFlag = FALSE;
177 int extractFlag = FALSE;
178 int createFlag = FALSE;
179 int verboseFlag = FALSE;
180 int tostdoutFlag = FALSE;
Eric Andersencc8ed391999-10-05 16:24:54 +0000181
Erik Andersene49d5ec2000-02-08 19:58:47 +0000182 argc--;
183 argv++;
Eric Andersencc8ed391999-10-05 16:24:54 +0000184
Erik Andersene49d5ec2000-02-08 19:58:47 +0000185 if (argc < 1)
186 usage(tar_usage);
Eric Andersencc8ed391999-10-05 16:24:54 +0000187
Erik Andersen298854f2000-03-23 01:09:18 +0000188 /* Parse options */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000189 if (**argv == '-')
190 options = (*argv++) + 1;
191 else
192 options = (*argv++);
193 argc--;
Eric Andersencc8ed391999-10-05 16:24:54 +0000194
Erik Andersene49d5ec2000-02-08 19:58:47 +0000195 for (; *options; options++) {
196 switch (*options) {
197 case 'f':
Erik Andersen298854f2000-03-23 01:09:18 +0000198 if (tarName != NULL)
199 fatalError( "Only one 'f' option allowed\n");
Erik Andersende552872000-01-23 01:34:05 +0000200
Erik Andersene49d5ec2000-02-08 19:58:47 +0000201 tarName = *argv++;
Erik Andersen298854f2000-03-23 01:09:18 +0000202 if (tarName == NULL)
203 fatalError( "Option requires an argument: No file specified\n");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000204 argc--;
Erik Andersende552872000-01-23 01:34:05 +0000205
Erik Andersene49d5ec2000-02-08 19:58:47 +0000206 break;
Erik Andersende552872000-01-23 01:34:05 +0000207
Erik Andersene49d5ec2000-02-08 19:58:47 +0000208 case 't':
209 if (extractFlag == TRUE || createFlag == TRUE)
210 goto flagError;
211 listFlag = TRUE;
212 break;
Erik Andersende552872000-01-23 01:34:05 +0000213
Erik Andersene49d5ec2000-02-08 19:58:47 +0000214 case 'x':
215 if (listFlag == TRUE || createFlag == TRUE)
216 goto flagError;
217 extractFlag = TRUE;
218 break;
219 case 'c':
220 if (extractFlag == TRUE || listFlag == TRUE)
221 goto flagError;
222 createFlag = TRUE;
223 break;
Erik Andersende552872000-01-23 01:34:05 +0000224
Erik Andersene49d5ec2000-02-08 19:58:47 +0000225 case 'v':
226 verboseFlag = TRUE;
227 break;
Erik Andersende552872000-01-23 01:34:05 +0000228
Erik Andersene49d5ec2000-02-08 19:58:47 +0000229 case 'O':
230 tostdoutFlag = TRUE;
Erik Andersen3364d782000-03-28 00:58:14 +0000231 tarName = "-";
Erik Andersene49d5ec2000-02-08 19:58:47 +0000232 break;
Erik Andersende552872000-01-23 01:34:05 +0000233
Erik Andersene49d5ec2000-02-08 19:58:47 +0000234 case '-':
235 usage(tar_usage);
236 break;
Erik Andersende552872000-01-23 01:34:05 +0000237
Erik Andersene49d5ec2000-02-08 19:58:47 +0000238 default:
Erik Andersen298854f2000-03-23 01:09:18 +0000239 fatalError( "Unknown tar flag '%c'\n"
Erik Andersene49d5ec2000-02-08 19:58:47 +0000240 "Try `tar --help' for more information\n", *options);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000241 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000242 }
243
Erik Andersene49d5ec2000-02-08 19:58:47 +0000244 /*
245 * Do the correct type of action supplying the rest of the
246 * command line arguments as the list of files to process.
247 */
248 if (createFlag == TRUE) {
Erik Andersende552872000-01-23 01:34:05 +0000249#ifndef BB_FEATURE_TAR_CREATE
Erik Andersen298854f2000-03-23 01:09:18 +0000250 fatalError( "This version of tar was not compiled with tar creation support.\n");
Erik Andersende552872000-01-23 01:34:05 +0000251#else
Erik Andersen6acaa402000-03-26 14:03:20 +0000252 exit(writeTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, argc, argv));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000253#endif
254 } else {
Erik Andersen298854f2000-03-23 01:09:18 +0000255 exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000256 }
Erik Andersende552872000-01-23 01:34:05 +0000257
Erik Andersene49d5ec2000-02-08 19:58:47 +0000258 flagError:
Erik Andersen298854f2000-03-23 01:09:18 +0000259 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
260}
261
262static void
Erik Andersen1ad302a2000-03-24 00:54:46 +0000263tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersen298854f2000-03-23 01:09:18 +0000264{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000265 size_t writeSize;
266 size_t readSize;
267 size_t actualWriteSz;
268 char buffer[BUFSIZ];
269 size_t size = header->size;
270 int outFd=fileno(stdout);
271
272 /* Open the file to be written, if a file is supposed to be written */
273 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
274 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0)
275 errorMsg(io_error, header->name, strerror(errno));
276 /* Create the path to the file, just in case it isn't there...
277 * This should not screw up path permissions or anything. */
278 createPath(header->name, 0777);
279 }
280
281 /* Write out the file, if we are supposed to be doing that */
282 while ( size > 0 ) {
283 actualWriteSz=0;
284 if ( size > sizeof(buffer) )
285 writeSize = readSize = sizeof(buffer);
286 else {
287 int mod = size % 512;
288 if ( mod != 0 )
289 readSize = size + (512 - mod);
290 else
291 readSize = size;
292 writeSize = size;
293 }
294 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
295 /* Tarball seems to have a problem */
Erik Andersendeea0482000-03-25 23:09:29 +0000296 errorMsg("tar: Unexpected EOF in archive\n");
Erik Andersen1ad302a2000-03-24 00:54:46 +0000297 return;
298 }
299 if ( readSize < writeSize )
300 writeSize = readSize;
301
302 /* Write out the file, if we are supposed to be doing that */
303 if (extractFlag==TRUE) {
304
305 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
306 /* Output file seems to have a problem */
307 errorMsg(io_error, header->name, strerror(errno));
308 return;
309 }
310 }
311
312 size -= actualWriteSz;
313 }
314
315 /* Now we are done writing the file out, so try
316 * and fix up the permissions and whatnot */
317 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
318 struct utimbuf t;
319 /* Now set permissions etc for the new file */
320 fchown(outFd, header->uid, header->gid);
321 fchmod(outFd, header->mode & ~S_IFMT);
322 close(outFd);
323 /* File must be closed before trying to change the date */
324 t.actime = time(0);
325 t.modtime = header->mtime;
326 utime(header->name, &t);
327 }
328}
329
330static void
331fixUpPermissions(TarInfo *header)
332{
333 struct utimbuf t;
334 /* Now set permissions etc for the new file */
335 chown(header->name, header->uid, header->gid);
336 chmod(header->name, header->mode);
337 /* Reset the time */
338 t.actime = time(0);
339 t.modtime = header->mtime;
340 utime(header->name, &t);
Eric Andersencc8ed391999-10-05 16:24:54 +0000341}
Erik Andersene454fb62000-03-23 04:27:58 +0000342
343static void
Erik Andersen1ad302a2000-03-24 00:54:46 +0000344tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000345{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000346
347 if (extractFlag==FALSE || tostdoutFlag==TRUE)
348 return;
349
350 if (createPath(header->name, header->mode) != TRUE) {
351 errorMsg("Error creating directory '%s': %s", header->name, strerror(errno));
352 return;
353 }
354 /* make the final component, just in case it was
355 * omitted by createPath() (which will skip the
356 * directory if it doesn't have a terminating '/') */
Erik Andersen6acaa402000-03-26 14:03:20 +0000357 if (mkdir(header->name, header->mode) == 0) {
358 fixUpPermissions(header);
359 }
Erik Andersene454fb62000-03-23 04:27:58 +0000360}
361
362static void
Erik Andersen1ad302a2000-03-24 00:54:46 +0000363tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000364{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000365 if (extractFlag==FALSE || tostdoutFlag==TRUE)
366 return;
367
368 if (link(header->linkname, header->name) < 0) {
Erik Andersendeea0482000-03-25 23:09:29 +0000369 errorMsg("Error creating hard link '%s': %s\n", header->linkname, strerror(errno));
Erik Andersen1ad302a2000-03-24 00:54:46 +0000370 return;
371 }
372
373 /* Now set permissions etc for the new directory */
374 fixUpPermissions(header);
Erik Andersene454fb62000-03-23 04:27:58 +0000375}
376
377static void
Erik Andersen1ad302a2000-03-24 00:54:46 +0000378tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000379{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000380 if (extractFlag==FALSE || tostdoutFlag==TRUE)
381 return;
382
383#ifdef S_ISLNK
384 if (symlink(header->linkname, header->name) < 0) {
Erik Andersendeea0482000-03-25 23:09:29 +0000385 errorMsg("Error creating symlink '%s': %s\n", header->linkname, strerror(errno));
Erik Andersen1ad302a2000-03-24 00:54:46 +0000386 return;
387 }
388 /* Try to change ownership of the symlink.
389 * If libs doesn't support that, don't bother.
390 * Changing the pointed-to-file is the Wrong Thing(tm).
391 */
392#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
393 lchown(header->name, header->uid, header->gid);
394#endif
395
396 /* Do not change permissions or date on symlink,
397 * since it changes the pointed to file instead. duh. */
398#else
399 fprintf(stderr, "Cannot create symbolic links\n");
400#endif
Erik Andersene454fb62000-03-23 04:27:58 +0000401}
402
403static void
Erik Andersen1ad302a2000-03-24 00:54:46 +0000404tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000405{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000406 if (extractFlag==FALSE || tostdoutFlag==TRUE)
407 return;
408
409 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
410 mknod(header->name, header->mode, makedev(header->devmajor, header->devminor));
411 } else if (S_ISFIFO(header->mode)) {
412 mkfifo(header->name, header->mode);
413 } else {
414 open(header->name, O_WRONLY | O_CREAT | O_TRUNC, header->mode);
415 }
416
417 /* Now set permissions etc for the new directory */
418 fixUpPermissions(header);
Erik Andersene454fb62000-03-23 04:27:58 +0000419}
420
Erik Andersen1ad302a2000-03-24 00:54:46 +0000421/* Read an octal value in a field of the specified width, with optional
Erik Andersen298854f2000-03-23 01:09:18 +0000422 * spaces on both sides of the number and with an optional null character
Erik Andersen1ad302a2000-03-24 00:54:46 +0000423 * at the end. Returns -1 on an illegal format. */
Erik Andersen298854f2000-03-23 01:09:18 +0000424static long getOctal(const char *cp, int size)
Eric Andersencc8ed391999-10-05 16:24:54 +0000425{
Erik Andersen298854f2000-03-23 01:09:18 +0000426 long val = 0;
Eric Andersencc8ed391999-10-05 16:24:54 +0000427
Erik Andersen298854f2000-03-23 01:09:18 +0000428 for(;(size > 0) && (*cp == ' '); cp++, size--);
429 if ((size == 0) || !isOctal(*cp))
430 return -1;
431 for(; (size > 0) && isOctal(*cp); size--) {
432 val = val * 8 + *cp++ - '0';
Eric Andersencc8ed391999-10-05 16:24:54 +0000433 }
Erik Andersen298854f2000-03-23 01:09:18 +0000434 for (;(size > 0) && (*cp == ' '); cp++, size--);
435 if ((size > 0) && *cp)
436 return -1;
437 return val;
438}
Eric Andersencc8ed391999-10-05 16:24:54 +0000439
Erik Andersen1ad302a2000-03-24 00:54:46 +0000440
Erik Andersen298854f2000-03-23 01:09:18 +0000441/* Parse the tar header and fill in the nice struct with the details */
442static int
Erik Andersen3364d782000-03-28 00:58:14 +0000443readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
Erik Andersen298854f2000-03-23 01:09:18 +0000444{
Erik Andersene454fb62000-03-23 04:27:58 +0000445 int i;
446 long chksum, sum;
447 unsigned char *s = (unsigned char *)rawHeader;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000448
Erik Andersen298854f2000-03-23 01:09:18 +0000449 header->name = rawHeader->name;
450 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
451 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
452 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
453 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
454 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
455 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
456 header->type = rawHeader->typeflag;
457 header->linkname = rawHeader->linkname;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000458 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
459 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000460
Erik Andersen298854f2000-03-23 01:09:18 +0000461 /* Check the checksum */
462 sum = ' ' * sizeof(rawHeader->chksum);
463 for ( i = TarChecksumOffset; i > 0; i-- )
464 sum += *s++;
Erik Andersene454fb62000-03-23 04:27:58 +0000465 s += sizeof(rawHeader->chksum);
466 for ( i = (512 - TarChecksumOffset - sizeof(rawHeader->chksum)); i > 0; i-- )
Erik Andersen298854f2000-03-23 01:09:18 +0000467 sum += *s++;
Erik Andersene454fb62000-03-23 04:27:58 +0000468 if (sum == chksum )
Erik Andersen298854f2000-03-23 01:09:18 +0000469 return ( TRUE);
470 return( FALSE);
471}
Erik Andersene49d5ec2000-02-08 19:58:47 +0000472
Erik Andersene49d5ec2000-02-08 19:58:47 +0000473
Erik Andersen1ad302a2000-03-24 00:54:46 +0000474/*
475 * Read a tar file and extract or list the specified files within it.
476 * If the list is empty than all files are extracted or listed.
477 */
478static int readTarFile(const char* tarName, int extractFlag, int listFlag,
479 int tostdoutFlag, int verboseFlag)
480{
481 int status, tarFd=0;
482 int errorFlag=FALSE;
483 TarHeader rawHeader;
484 TarInfo header;
485 int alreadyWarned=FALSE;
486 //int skipFileFlag=FALSE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000487
Erik Andersen1ad302a2000-03-24 00:54:46 +0000488 /* Open the tar file for reading. */
489 if (!strcmp(tarName, "-"))
490 tarFd = fileno(stdin);
491 else
492 tarFd = open(tarName, O_RDONLY);
493 if (tarFd < 0) {
Erik Andersendeea0482000-03-25 23:09:29 +0000494 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
Erik Andersen1ad302a2000-03-24 00:54:46 +0000495 return ( FALSE);
Erik Andersen06936df2000-01-23 02:14:20 +0000496 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000497
Erik Andersene49d5ec2000-02-08 19:58:47 +0000498 /* Set the umask for this process so it doesn't
Erik Andersen1ad302a2000-03-24 00:54:46 +0000499 * screw up permission setting for us later. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000500 umask(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000501
Erik Andersen1ad302a2000-03-24 00:54:46 +0000502 /* Read the tar file, and iterate over it one file at a time */
503 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
Erik Andersene2729152000-02-18 21:34:17 +0000504
Erik Andersen1ad302a2000-03-24 00:54:46 +0000505 /* First, try to read the header */
Erik Andersen3364d782000-03-28 00:58:14 +0000506 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
Erik Andersen1ad302a2000-03-24 00:54:46 +0000507 close( tarFd);
508 if ( *(header.name) == '\0' ) {
509 goto endgame;
510 } else {
511 errorFlag=TRUE;
512 errorMsg("Bad tar header, skipping\n");
513 continue;
514 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000515 }
Erik Andersen1ad302a2000-03-24 00:54:46 +0000516 if ( *(header.name) == '\0' )
517 goto endgame;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000518
Erik Andersen1ad302a2000-03-24 00:54:46 +0000519 /* Check for and relativify any absolute paths */
520 if ( *(header.name) == '/' ) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000521
Erik Andersen1ad302a2000-03-24 00:54:46 +0000522 while (*(header.name) == '/')
523 ++*(header.name);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000524
Erik Andersen1ad302a2000-03-24 00:54:46 +0000525 if (alreadyWarned == FALSE) {
526 errorMsg("Absolute path detected, removing leading slashes\n");
527 alreadyWarned = TRUE;
528 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000529 }
Erik Andersen1ad302a2000-03-24 00:54:46 +0000530
531 /* Special treatment if the list (-t) flag is on */
532 if (verboseFlag == TRUE && extractFlag == FALSE) {
533 int len, len1;
534 char buf[35];
535 struct tm *tm = localtime (&(header.mtime));
536
537 len=printf("%s %d/%-d ", modeString(header.mode), header.uid, header.gid);
538 if (header.type==CHRTYPE || header.type==BLKTYPE) {
539 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
540 header.devmajor, header.devminor);
541 } else {
542 len1=snprintf(buf, sizeof(buf), "%d ", header.size);
543 }
544 /* Jump through some hoops to make the columns match up */
545 for(;(len+len1)<31;len++)
546 printf(" ");
547 printf(buf);
548
549 /* Use ISO 8610 time format */
550 if (tm) {
551 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
552 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
553 tm->tm_hour, tm->tm_min, tm->tm_sec);
554 }
555 }
556 /* List contents if we are supposed to do that */
557 if (verboseFlag == TRUE || listFlag == TRUE) {
558 /* Now the normal listing */
559 printf("%s", header.name);
560 /* If this is a link, say so */
561 if (header.type==LNKTYPE)
562 printf(" link to %s", header.linkname);
563 else if (header.type==SYMTYPE)
564 printf(" -> %s", header.linkname);
565 printf("\n");
566 }
567
568#if 0
569 /* See if we want to restore this file or not */
570 skipFileFlag=FALSE;
571 if (wantFileName(outName) == FALSE) {
Erik Andersene49d5ec2000-02-08 19:58:47 +0000572 skipFileFlag = TRUE;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000573 }
Erik Andersen05100cd2000-01-16 01:30:52 +0000574#endif
Eric Andersencc8ed391999-10-05 16:24:54 +0000575
Erik Andersen1ad302a2000-03-24 00:54:46 +0000576 /* If we got here, we can be certain we have a legitimate
577 * header to work with. So work with it. */
578 switch ( header.type ) {
579 case REGTYPE:
580 case REGTYPE0:
581 /* If the name ends in a '/' then assume it is
582 * supposed to be a directory, and fall through */
583 if (header.name[strlen(header.name)-1] != '/') {
584 tarExtractRegularFile(&header, extractFlag, tostdoutFlag);
585 break;
586 }
587 case DIRTYPE:
588 tarExtractDirectory( &header, extractFlag, tostdoutFlag);
589 break;
590 case LNKTYPE:
591 tarExtractHardLink( &header, extractFlag, tostdoutFlag);
592 break;
593 case SYMTYPE:
594 tarExtractSymLink( &header, extractFlag, tostdoutFlag);
595 break;
596 case CHRTYPE:
597 case BLKTYPE:
598 case FIFOTYPE:
599 tarExtractSpecial( &header, extractFlag, tostdoutFlag);
600 break;
601 default:
602 close( tarFd);
603 return( FALSE);
604 }
605 }
606 close(tarFd);
607 if (status > 0) {
608 /* Bummer - we read a partial header */
Erik Andersendeea0482000-03-25 23:09:29 +0000609 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
Erik Andersen1ad302a2000-03-24 00:54:46 +0000610 return ( FALSE);
611 }
612 else
613 return( status);
614
615 /* Stuff to do when we are done */
616endgame:
617 close( tarFd);
618 if ( *(header.name) == '\0' ) {
619 if (errorFlag==FALSE)
620 return( TRUE);
621 }
622 return( FALSE);
623}
624
Erik Andersen6acaa402000-03-26 14:03:20 +0000625
626#ifdef BB_FEATURE_TAR_CREATE
627
628/* Put an octal string into the specified buffer.
629 * The number is zero and space padded and possibly null padded.
630 * Returns TRUE if successful. */
631static int putOctal (char *cp, int len, long value)
632{
633 int tempLength;
634 char *tempString;
635 char tempBuffer[32];
636
637 /* Create a string of the specified length with an initial space,
638 * leading zeroes and the octal number, and a trailing null. */
639 tempString = tempBuffer;
640
641 sprintf (tempString, " %0*lo", len - 2, value);
642
643 tempLength = strlen (tempString) + 1;
644
645 /* If the string is too large, suppress the leading space. */
646 if (tempLength > len) {
647 tempLength--;
648 tempString++;
649 }
650
651 /* If the string is still too large, suppress the trailing null. */
652 if (tempLength > len)
653 tempLength--;
654
655 /* If the string is still too large, fail. */
656 if (tempLength > len)
657 return FALSE;
658
659 /* Copy the string to the field. */
660 memcpy (cp, tempString, len);
661
662 return TRUE;
663}
664
Erik Andersen3364d782000-03-28 00:58:14 +0000665/* Write out a tar header for the specified file */
666static int
667writeTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
Erik Andersen6acaa402000-03-26 14:03:20 +0000668{
Erik Andersen3364d782000-03-28 00:58:14 +0000669 int i;
670 long chksum, sum;
671 unsigned char *s = (unsigned char *)rawHeader;
672
673 struct TarHeader header;
674
675 strcpy(header.name, fileName);
676 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode & 0777);
677 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
678 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
679 putOctal(header.size, sizeof(header.size), statbuf->st_size);
680 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
681
682 if (S_ISLNK(statbuf.st_mode)) {
683 header.type = LNKTYPE;
684 // Handle SYMTYPE
685 } else if (S_ISDIR(statbuf.st_mode)) {
686 header.type = DIRTYPE;
687 } else if (S_ISCHR(statbuf.st_mode)) {
688 header.type = CHRTYPE;
689 } else if (S_ISBLK(statbuf.st_mode)) {
690 header.type = BLKTYPE;
691 } else if (S_ISFIFO(statbuf.st_mode)) {
692 header.type = FIFOTYPE;
693 } else if (S_ISSOCK(statbuf.st_mode)) {
694 header.type = S_ISSOCK;
695 } else if (S_ISLNK(statbuf.st_mode)) {
696 header.type = LNKTYPE;
697 } else if (S_ISLNK(statbuf.st_mode)) {
698 header.type = REGTYPE;
699 }
700#if 0
701 header->linkname = rawHeader->linkname;
702 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
703 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
704
705 /* Write out the checksum */
706 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
707#endif
708
709 return ( TRUE);
710}
711
712
713static int fileAction(const char *fileName, struct stat *statbuf, void* userData)
714{
715 int *tarFd=(int*)userData;
716 dprintf(*tarFd, "%s\n", fileName);
Erik Andersen6acaa402000-03-26 14:03:20 +0000717 return (TRUE);
718}
719
720static int writeTarFile(const char* tarName, int extractFlag, int listFlag,
721 int tostdoutFlag, int verboseFlag, int argc, char **argv)
722{
Erik Andersen3364d782000-03-28 00:58:14 +0000723 int tarFd=-1;
Erik Andersen6acaa402000-03-26 14:03:20 +0000724 //int errorFlag=FALSE;
725 //TarHeader rawHeader;
726 //TarInfo header;
727 //int alreadyWarned=FALSE;
Erik Andersen6acaa402000-03-26 14:03:20 +0000728 //int skipFileFlag=FALSE;
Erik Andersen3364d782000-03-28 00:58:14 +0000729 struct stat tarballStat;
730 dev_t tarDev = 0;
731 ino_t tarInode = 0;
732
733 /* Make sure there is at least one file to tar up. */
734 if (argc <= 0)
735 fatalError("tar: Cowardly refusing to create an empty archive\n");
Erik Andersen6acaa402000-03-26 14:03:20 +0000736
737 /* Open the tar file for writing. */
Erik Andersen3364d782000-03-28 00:58:14 +0000738 if (tostdoutFlag == TRUE)
Erik Andersen6acaa402000-03-26 14:03:20 +0000739 tarFd = fileno(stdout);
740 else
741 tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
742 if (tarFd < 0) {
743 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
744 return ( FALSE);
745 }
Erik Andersen3364d782000-03-28 00:58:14 +0000746 /* Store the device and inode of the tarball, so we can be sure
747 * not to try and include it into itself.... */
748 if (fstat(tarFd, &tarballStat) < 0)
749 fatalError(io_error, tarName, strerror(errno));
750 tarDev = tarballStat.st_dev;
751 tarInode = tarballStat.st_ino;
Erik Andersen6acaa402000-03-26 14:03:20 +0000752
753 /* Set the umask for this process so it doesn't
754 * screw up permission setting for us later. */
755 umask(0);
756
757 /* Read the directory/files and iterate over them one at a time */
Erik Andersen3364d782000-03-28 00:58:14 +0000758 while (argc-- > 0) {
759 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
760 fileAction, fileAction, (void*) &tarFd) == FALSE) {
761 exit(FALSE);
762 }
Erik Andersen6acaa402000-03-26 14:03:20 +0000763 }
764
Erik Andersen6acaa402000-03-26 14:03:20 +0000765 close(tarFd);
766 return( TRUE);
767}
768
769
770#endif
771