blob: c5aad45d6b568289f65f8e80aae47f01de1b9291 [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 Andersen68a9ea42000-04-04 18:39:50 +00003 * Mini tar implementation for busybox
Erik Andersen6acaa402000-03-26 14:03:20 +00004 *
Erik Andersen61677fe2000-04-13 01:18:56 +00005 * Note, that as of BusyBox-0.43, tar has been completely rewritten from the
6 * ground up. It still has remnents of the old code lying about, but it is
7 * very different now (i.e. cleaner, less global variables, etc)
Eric Andersenc4996011999-10-20 22:08:37 +00008 *
Erik Andersen68a9ea42000-04-04 18:39:50 +00009 * Copyright (C) 2000 by Lineo, inc.
Erik Andersen1ad302a2000-03-24 00:54:46 +000010 * 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 *
Erik Andersen68a9ea42000-04-04 18:39:50 +000018 * Based in part on the tar implementation from busybox-0.28
Erik Andersen6acaa402000-03-26 14:03:20 +000019 * 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>
Eric Andersencc8ed391999-10-05 16:24:54 +000052
Eric Andersene77ae3a1999-10-19 20:03:34 +000053
Erik Andersen0817d132000-04-09 15:17:40 +000054static const char tar_usage[] =
Erik Andersen05100cd2000-01-16 01:30:52 +000055#ifdef BB_FEATURE_TAR_CREATE
Erik Andersen0817d132000-04-09 15:17:40 +000056 "tar -[cxtvO] "
Erik Andersen05100cd2000-01-16 01:30:52 +000057#else
Erik Andersen0817d132000-04-09 15:17:40 +000058 "tar -[xtvO] "
Erik Andersen05100cd2000-01-16 01:30:52 +000059#endif
Erik Andersen0817d132000-04-09 15:17:40 +000060#if defined BB_FEATURE_TAR_EXCLUDE
61 "[--exclude File] "
62#endif
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000063 "[-f tarFile] [FILE] ...\n"
64#ifndef BB_FEATURE_TRIVIAL_HELP
65 "\nCreate, extract, or list files from a tar file. Note that\n"
Erik Andersen0817d132000-04-09 15:17:40 +000066 "this version of tar treats hard links as separate files.\n\n"
67 "Main operation mode:\n"
68#ifdef BB_FEATURE_TAR_CREATE
69 "\tc\t\tcreate\n"
70#endif
71 "\tx\t\textract\n"
72 "\tt\t\tlist\n"
Erik Andersena3e57ca2000-04-19 03:38:01 +000073 "\nFile selection:\n"
Erik Andersen0817d132000-04-09 15:17:40 +000074 "\tf\t\tname of tarfile or \"-\" for stdin\n"
75 "\tO\t\textract to stdout\n"
76#if defined BB_FEATURE_TAR_EXCLUDE
77 "\t--exclude\tfile to exclude\n"
78#endif
Erik Andersena3e57ca2000-04-19 03:38:01 +000079 "\nInformative output:\n"
Erik Andersen0817d132000-04-09 15:17:40 +000080 "\tv\t\tverbosely list files processed\n"
Erik Andersen7ab9c7e2000-05-12 19:41:47 +000081#endif
Erik Andersen0817d132000-04-09 15:17:40 +000082 ;
Eric Andersene77ae3a1999-10-19 20:03:34 +000083
Erik Andersen298854f2000-03-23 01:09:18 +000084/* Tar file constants */
Erik Andersen1ad302a2000-03-24 00:54:46 +000085#ifndef MAJOR
86#define MAJOR(dev) (((dev)>>8)&0xff)
87#define MINOR(dev) ((dev)&0xff)
88#endif
Eric Andersencc8ed391999-10-05 16:24:54 +000089
90
Erik Andersen298854f2000-03-23 01:09:18 +000091/* POSIX tar Header Block, from POSIX 1003.1-1990 */
92struct TarHeader
93{
94 /* byte offset */
Erik Andersen0817d132000-04-09 15:17:40 +000095 char name[100]; /* 0-99 */
96 char mode[8]; /* 100-107 */
97 char uid[8]; /* 108-115 */
98 char gid[8]; /* 116-123 */
99 char size[12]; /* 124-135 */
100 char mtime[12]; /* 136-147 */
101 char chksum[8]; /* 148-155 */
102 char typeflag; /* 156-156 */
103 char linkname[100]; /* 157-256 */
104 char magic[6]; /* 257-262 */
105 char version[2]; /* 263-264 */
106 char uname[32]; /* 265-296 */
107 char gname[32]; /* 297-328 */
108 char devmajor[8]; /* 329-336 */
109 char devminor[8]; /* 337-344 */
110 char prefix[155]; /* 345-499 */
111 char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
Erik Andersen298854f2000-03-23 01:09:18 +0000112};
113typedef struct TarHeader TarHeader;
Eric Andersencc8ed391999-10-05 16:24:54 +0000114
Eric Andersencc8ed391999-10-05 16:24:54 +0000115
Erik Andersen298854f2000-03-23 01:09:18 +0000116/* A few useful constants */
117#define TAR_MAGIC "ustar" /* ustar and a null */
Erik Andersen0817d132000-04-09 15:17:40 +0000118#define TAR_VERSION " " /* Be compatable with GNU tar format */
Erik Andersen298854f2000-03-23 01:09:18 +0000119#define TAR_MAGIC_LEN 6
120#define TAR_VERSION_LEN 2
Erik Andersen298854f2000-03-23 01:09:18 +0000121#define TAR_BLOCK_SIZE 512
122
123/* A nice enum with all the possible tar file content types */
124enum TarFileType
125{
126 REGTYPE = '0', /* regular file */
127 REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
128 LNKTYPE = '1', /* hard link */
129 SYMTYPE = '2', /* symbolic link */
130 CHRTYPE = '3', /* character special */
131 BLKTYPE = '4', /* block special */
132 DIRTYPE = '5', /* directory */
133 FIFOTYPE = '6', /* FIFO special */
134 CONTTYPE = '7', /* reserved */
135};
136typedef enum TarFileType TarFileType;
137
138/* This struct ignores magic, non-numeric user name,
139 * non-numeric group name, and the checksum, since
140 * these are all ignored by BusyBox tar. */
141struct TarInfo
142{
143 int tarFd; /* An open file descriptor for reading from the tarball */
144 char * name; /* File name */
145 mode_t mode; /* Unix mode, including device bits. */
146 uid_t uid; /* Numeric UID */
147 gid_t gid; /* Numeric GID */
148 size_t size; /* Size of file */
149 time_t mtime; /* Last-modified time */
150 enum TarFileType type; /* Regular, directory, link, etc */
151 char * linkname; /* Name for symbolic and hard links */
Erik Andersen1ad302a2000-03-24 00:54:46 +0000152 long devmajor; /* Major number for special device */
153 long devminor; /* Minor number for special device */
Erik Andersen298854f2000-03-23 01:09:18 +0000154};
155typedef struct TarInfo TarInfo;
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,
Erik Andersenecd51242000-04-08 03:08:21 +0000159 int tostdoutFlag, int verboseFlag, char** excludeList);
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. */
Erik Andersen68a9ea42000-04-04 18:39:50 +0000165static int writeTarFile(const char* tarName, int tostdoutFlag,
Erik Andersenecd51242000-04-08 03:08:21 +0000166 int verboseFlag, int argc, char **argv, char** excludeList);
Erik Andersen05100cd2000-01-16 01:30:52 +0000167#endif
168
Eric Andersencc8ed391999-10-05 16:24:54 +0000169
Erik Andersene49d5ec2000-02-08 19:58:47 +0000170extern int tar_main(int argc, char **argv)
Eric Andersencc8ed391999-10-05 16:24:54 +0000171{
Erik Andersenecd51242000-04-08 03:08:21 +0000172 char** excludeList=NULL;
Erik Andersen0817d132000-04-09 15:17:40 +0000173#if defined BB_FEATURE_TAR_EXCLUDE
Erik Andersenecd51242000-04-08 03:08:21 +0000174 int excludeListSize=0;
Erik Andersen0817d132000-04-09 15:17:40 +0000175#endif
Erik Andersen298854f2000-03-23 01:09:18 +0000176 const char *tarName=NULL;
Erik Andersen298854f2000-03-23 01:09:18 +0000177 int listFlag = FALSE;
178 int extractFlag = FALSE;
179 int createFlag = FALSE;
180 int verboseFlag = FALSE;
181 int tostdoutFlag = FALSE;
Erik Andersenecd51242000-04-08 03:08:21 +0000182 int stopIt;
Eric Andersencc8ed391999-10-05 16:24:54 +0000183
Erik Andersenecd51242000-04-08 03:08:21 +0000184 if (argc <= 1)
Erik Andersene49d5ec2000-02-08 19:58:47 +0000185 usage(tar_usage);
Eric Andersencc8ed391999-10-05 16:24:54 +0000186
Erik Andersenecd51242000-04-08 03:08:21 +0000187 /* Parse any options */
Erik Andersen8ea7d8c2000-05-20 00:40:08 +0000188 while (--argc > 0 && strspn(*(++argv), "-cxt") >0 ) {
Erik Andersenecd51242000-04-08 03:08:21 +0000189 stopIt=FALSE;
190 while (stopIt==FALSE && *(++(*argv))) {
191 switch (**argv) {
192 case 'f':
193 if (--argc == 0) {
194 fatalError( "Option requires an argument: No file specified\n");
195 }
196 if (tarName != NULL)
197 fatalError( "Only one 'f' option allowed\n");
198 tarName = *(++argv);
199 if (tarName == NULL)
200 fatalError( "Option requires an argument: No file specified\n");
201 stopIt=TRUE;
202 break;
Eric Andersencc8ed391999-10-05 16:24:54 +0000203
Erik Andersenecd51242000-04-08 03:08:21 +0000204 case 't':
205 if (extractFlag == TRUE || createFlag == TRUE)
206 goto flagError;
207 listFlag = TRUE;
208 break;
Erik Andersende552872000-01-23 01:34:05 +0000209
Erik Andersenecd51242000-04-08 03:08:21 +0000210 case 'x':
211 if (listFlag == TRUE || createFlag == TRUE)
212 goto flagError;
213 extractFlag = TRUE;
214 break;
215 case 'c':
216 if (extractFlag == TRUE || listFlag == TRUE)
217 goto flagError;
218 createFlag = TRUE;
219 break;
Erik Andersende552872000-01-23 01:34:05 +0000220
Erik Andersenecd51242000-04-08 03:08:21 +0000221 case 'v':
222 verboseFlag = TRUE;
223 break;
Erik Andersende552872000-01-23 01:34:05 +0000224
Erik Andersenecd51242000-04-08 03:08:21 +0000225 case 'O':
226 tostdoutFlag = TRUE;
227 tarName = "-";
228 break;
Erik Andersenecd51242000-04-08 03:08:21 +0000229 case '-':
Erik Andersen0817d132000-04-09 15:17:40 +0000230#if defined BB_FEATURE_TAR_EXCLUDE
231 if (strcmp(*argv, "-exclude")==0) {
232 if (--argc == 0) {
233 fatalError( "Option requires an argument: No file specified\n");
234 }
235 excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
236 excludeList[excludeListSize] = *(++argv);
237 /* Remove leading "/"s */
238 if (*excludeList[excludeListSize] =='/') {
239 excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
240 }
241 if (excludeList[excludeListSize++] == NULL)
242 fatalError( "Option requires an argument: No file specified\n");
243 /* Tack a NULL onto the end of the list */
244 excludeList[excludeListSize] = NULL;
245 stopIt=TRUE;
246 break;
247 }
248#endif
Erik Andersenecd51242000-04-08 03:08:21 +0000249 break;
Erik Andersende552872000-01-23 01:34:05 +0000250
Erik Andersenecd51242000-04-08 03:08:21 +0000251 default:
252 fatalError( "Unknown tar flag '%c'\n"
253 "Try `tar --help' for more information\n", **argv);
254 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000255 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000256 }
257
Erik Andersene49d5ec2000-02-08 19:58:47 +0000258 /*
259 * Do the correct type of action supplying the rest of the
260 * command line arguments as the list of files to process.
261 */
262 if (createFlag == TRUE) {
Erik Andersende552872000-01-23 01:34:05 +0000263#ifndef BB_FEATURE_TAR_CREATE
Erik Andersen298854f2000-03-23 01:09:18 +0000264 fatalError( "This version of tar was not compiled with tar creation support.\n");
Erik Andersende552872000-01-23 01:34:05 +0000265#else
Erik Andersenecd51242000-04-08 03:08:21 +0000266 exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000267#endif
Erik Andersen8ea7d8c2000-05-20 00:40:08 +0000268 }
269 if (listFlag == TRUE || extractFlag == TRUE) {
Erik Andersenecd51242000-04-08 03:08:21 +0000270 exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000271 }
Erik Andersende552872000-01-23 01:34:05 +0000272
Erik Andersene49d5ec2000-02-08 19:58:47 +0000273 flagError:
Erik Andersen298854f2000-03-23 01:09:18 +0000274 fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
275}
276
277static void
Erik Andersen6a34b532000-04-07 06:55:38 +0000278fixUpPermissions(TarInfo *header)
279{
280 struct utimbuf t;
281 /* Now set permissions etc for the new file */
282 chown(header->name, header->uid, header->gid);
283 chmod(header->name, header->mode);
284 /* Reset the time */
285 t.actime = time(0);
286 t.modtime = header->mtime;
287 utime(header->name, &t);
288}
289
290static int
Erik Andersen1ad302a2000-03-24 00:54:46 +0000291tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersen298854f2000-03-23 01:09:18 +0000292{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000293 size_t writeSize;
294 size_t readSize;
295 size_t actualWriteSz;
296 char buffer[BUFSIZ];
297 size_t size = header->size;
298 int outFd=fileno(stdout);
299
300 /* Open the file to be written, if a file is supposed to be written */
301 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
302 if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0)
303 errorMsg(io_error, header->name, strerror(errno));
304 /* Create the path to the file, just in case it isn't there...
305 * This should not screw up path permissions or anything. */
306 createPath(header->name, 0777);
307 }
308
309 /* Write out the file, if we are supposed to be doing that */
310 while ( size > 0 ) {
311 actualWriteSz=0;
312 if ( size > sizeof(buffer) )
313 writeSize = readSize = sizeof(buffer);
314 else {
315 int mod = size % 512;
316 if ( mod != 0 )
317 readSize = size + (512 - mod);
318 else
319 readSize = size;
320 writeSize = size;
321 }
322 if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
323 /* Tarball seems to have a problem */
Erik Andersendeea0482000-03-25 23:09:29 +0000324 errorMsg("tar: Unexpected EOF in archive\n");
Erik Andersen6a34b532000-04-07 06:55:38 +0000325 return( FALSE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000326 }
327 if ( readSize < writeSize )
328 writeSize = readSize;
329
330 /* Write out the file, if we are supposed to be doing that */
331 if (extractFlag==TRUE) {
332
333 if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
334 /* Output file seems to have a problem */
335 errorMsg(io_error, header->name, strerror(errno));
Erik Andersen6a34b532000-04-07 06:55:38 +0000336 return( FALSE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000337 }
Erik Andersen0817d132000-04-09 15:17:40 +0000338 } else {
339 actualWriteSz=writeSize;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000340 }
341
342 size -= actualWriteSz;
343 }
344
345 /* Now we are done writing the file out, so try
346 * and fix up the permissions and whatnot */
347 if (extractFlag==TRUE && tostdoutFlag==FALSE) {
Erik Andersen1ad302a2000-03-24 00:54:46 +0000348 close(outFd);
Erik Andersen6a34b532000-04-07 06:55:38 +0000349 fixUpPermissions(header);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000350 }
Erik Andersen6a34b532000-04-07 06:55:38 +0000351 return( TRUE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000352}
353
Erik Andersen6a34b532000-04-07 06:55:38 +0000354static int
Erik Andersen1ad302a2000-03-24 00:54:46 +0000355tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000356{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000357
358 if (extractFlag==FALSE || tostdoutFlag==TRUE)
Erik Andersen6a34b532000-04-07 06:55:38 +0000359 return( TRUE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000360
361 if (createPath(header->name, header->mode) != TRUE) {
Erik Andersen6a34b532000-04-07 06:55:38 +0000362 errorMsg("tar: %s: Cannot mkdir: %s\n",
363 header->name, strerror(errno));
364 return( FALSE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000365 }
366 /* make the final component, just in case it was
367 * omitted by createPath() (which will skip the
368 * directory if it doesn't have a terminating '/') */
Erik Andersen6acaa402000-03-26 14:03:20 +0000369 if (mkdir(header->name, header->mode) == 0) {
370 fixUpPermissions(header);
371 }
Erik Andersen6a34b532000-04-07 06:55:38 +0000372 return( TRUE);
Erik Andersene454fb62000-03-23 04:27:58 +0000373}
374
Erik Andersen6a34b532000-04-07 06:55:38 +0000375static int
Erik Andersen1ad302a2000-03-24 00:54:46 +0000376tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000377{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000378 if (extractFlag==FALSE || tostdoutFlag==TRUE)
Erik Andersen6a34b532000-04-07 06:55:38 +0000379 return( TRUE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000380
381 if (link(header->linkname, header->name) < 0) {
Erik Andersen6a34b532000-04-07 06:55:38 +0000382 errorMsg("tar: %s: Cannot create hard link to '%s': %s\n",
Erik Andersen5661fe02000-04-05 01:00:52 +0000383 header->name, header->linkname, strerror(errno));
Erik Andersen6a34b532000-04-07 06:55:38 +0000384 return( FALSE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000385 }
386
387 /* Now set permissions etc for the new directory */
388 fixUpPermissions(header);
Erik Andersen6a34b532000-04-07 06:55:38 +0000389 return( TRUE);
Erik Andersene454fb62000-03-23 04:27:58 +0000390}
391
Erik Andersen6a34b532000-04-07 06:55:38 +0000392static int
Erik Andersen1ad302a2000-03-24 00:54:46 +0000393tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000394{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000395 if (extractFlag==FALSE || tostdoutFlag==TRUE)
Erik Andersen6a34b532000-04-07 06:55:38 +0000396 return( TRUE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000397
398#ifdef S_ISLNK
399 if (symlink(header->linkname, header->name) < 0) {
Erik Andersen6a34b532000-04-07 06:55:38 +0000400 errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
Erik Andersen5661fe02000-04-05 01:00:52 +0000401 header->name, header->linkname, strerror(errno));
Erik Andersen6a34b532000-04-07 06:55:38 +0000402 return( FALSE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000403 }
404 /* Try to change ownership of the symlink.
405 * If libs doesn't support that, don't bother.
406 * Changing the pointed-to-file is the Wrong Thing(tm).
407 */
408#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
409 lchown(header->name, header->uid, header->gid);
410#endif
411
412 /* Do not change permissions or date on symlink,
413 * since it changes the pointed to file instead. duh. */
414#else
Erik Andersen6a34b532000-04-07 06:55:38 +0000415 errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
416 header->name, header->linkname,
417 "symlinks not supported");
Erik Andersen1ad302a2000-03-24 00:54:46 +0000418#endif
Erik Andersen6a34b532000-04-07 06:55:38 +0000419 return( TRUE);
Erik Andersene454fb62000-03-23 04:27:58 +0000420}
421
Erik Andersen6a34b532000-04-07 06:55:38 +0000422static int
Erik Andersen1ad302a2000-03-24 00:54:46 +0000423tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
Erik Andersene454fb62000-03-23 04:27:58 +0000424{
Erik Andersen1ad302a2000-03-24 00:54:46 +0000425 if (extractFlag==FALSE || tostdoutFlag==TRUE)
Erik Andersen6a34b532000-04-07 06:55:38 +0000426 return( TRUE);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000427
428 if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
Erik Andersen6a34b532000-04-07 06:55:38 +0000429 if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
430 errorMsg("tar: %s: Cannot mknod: %s\n",
431 header->name, strerror(errno));
432 return( FALSE);
433 }
Erik Andersen1ad302a2000-03-24 00:54:46 +0000434 } else if (S_ISFIFO(header->mode)) {
Erik Andersen6a34b532000-04-07 06:55:38 +0000435 if (mkfifo(header->name, header->mode) < 0) {
436 errorMsg("tar: %s: Cannot mkfifo: %s\n",
437 header->name, strerror(errno));
438 return( FALSE);
439 }
Erik Andersen1ad302a2000-03-24 00:54:46 +0000440 }
441
442 /* Now set permissions etc for the new directory */
443 fixUpPermissions(header);
Erik Andersen6a34b532000-04-07 06:55:38 +0000444 return( TRUE);
Erik Andersene454fb62000-03-23 04:27:58 +0000445}
446
Erik Andersen1ad302a2000-03-24 00:54:46 +0000447/* Read an octal value in a field of the specified width, with optional
Erik Andersen298854f2000-03-23 01:09:18 +0000448 * spaces on both sides of the number and with an optional null character
Erik Andersen1ad302a2000-03-24 00:54:46 +0000449 * at the end. Returns -1 on an illegal format. */
Erik Andersen298854f2000-03-23 01:09:18 +0000450static long getOctal(const char *cp, int size)
Eric Andersencc8ed391999-10-05 16:24:54 +0000451{
Erik Andersen298854f2000-03-23 01:09:18 +0000452 long val = 0;
Eric Andersencc8ed391999-10-05 16:24:54 +0000453
Erik Andersen298854f2000-03-23 01:09:18 +0000454 for(;(size > 0) && (*cp == ' '); cp++, size--);
455 if ((size == 0) || !isOctal(*cp))
456 return -1;
457 for(; (size > 0) && isOctal(*cp); size--) {
458 val = val * 8 + *cp++ - '0';
Eric Andersencc8ed391999-10-05 16:24:54 +0000459 }
Erik Andersen298854f2000-03-23 01:09:18 +0000460 for (;(size > 0) && (*cp == ' '); cp++, size--);
461 if ((size > 0) && *cp)
462 return -1;
463 return val;
464}
Eric Andersencc8ed391999-10-05 16:24:54 +0000465
Erik Andersen1ad302a2000-03-24 00:54:46 +0000466
Erik Andersen298854f2000-03-23 01:09:18 +0000467/* Parse the tar header and fill in the nice struct with the details */
468static int
Erik Andersen3364d782000-03-28 00:58:14 +0000469readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
Erik Andersen298854f2000-03-23 01:09:18 +0000470{
Erik Andersene454fb62000-03-23 04:27:58 +0000471 int i;
Erik Andersen84e09e42000-04-08 20:58:35 +0000472 long chksum, sum=0;
Erik Andersene454fb62000-03-23 04:27:58 +0000473 unsigned char *s = (unsigned char *)rawHeader;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000474
Erik Andersen298854f2000-03-23 01:09:18 +0000475 header->name = rawHeader->name;
Erik Andersen84e09e42000-04-08 20:58:35 +0000476 /* Check for and relativify any absolute paths */
477 if ( *(header->name) == '/' ) {
478 static int alreadyWarned=FALSE;
479
480 while (*(header->name) == '/')
481 ++*(header->name);
482
483 if (alreadyWarned == FALSE) {
484 errorMsg("tar: Removing leading '/' from member names\n");
485 alreadyWarned = TRUE;
486 }
487 }
488
Erik Andersen298854f2000-03-23 01:09:18 +0000489 header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
490 header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
491 header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
492 header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
493 header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
494 chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
495 header->type = rawHeader->typeflag;
496 header->linkname = rawHeader->linkname;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000497 header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
498 header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
Erik Andersene49d5ec2000-02-08 19:58:47 +0000499
Erik Andersen298854f2000-03-23 01:09:18 +0000500 /* Check the checksum */
Erik Andersen84e09e42000-04-08 20:58:35 +0000501 for (i = sizeof(*rawHeader); i-- != 0;) {
Erik Andersen298854f2000-03-23 01:09:18 +0000502 sum += *s++;
Erik Andersen84e09e42000-04-08 20:58:35 +0000503 }
504 /* Remove the effects of the checksum field (replace
505 * with blanks for the purposes of the checksum) */
506 s = rawHeader->chksum;
507 for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
508 sum -= *s++;
509 }
510 sum += ' ' * sizeof(rawHeader->chksum);
Erik Andersene454fb62000-03-23 04:27:58 +0000511 if (sum == chksum )
Erik Andersen298854f2000-03-23 01:09:18 +0000512 return ( TRUE);
513 return( FALSE);
514}
Erik Andersene49d5ec2000-02-08 19:58:47 +0000515
Erik Andersene49d5ec2000-02-08 19:58:47 +0000516
Erik Andersen1ad302a2000-03-24 00:54:46 +0000517/*
518 * Read a tar file and extract or list the specified files within it.
519 * If the list is empty than all files are extracted or listed.
520 */
521static int readTarFile(const char* tarName, int extractFlag, int listFlag,
Erik Andersenecd51242000-04-08 03:08:21 +0000522 int tostdoutFlag, int verboseFlag, char** excludeList)
Erik Andersen1ad302a2000-03-24 00:54:46 +0000523{
Erik Andersen0817d132000-04-09 15:17:40 +0000524 int status, tarFd=-1;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000525 int errorFlag=FALSE;
526 TarHeader rawHeader;
527 TarInfo header;
Erik Andersen0817d132000-04-09 15:17:40 +0000528#if defined BB_FEATURE_TAR_EXCLUDE
529 char** tmpList;
530#endif
Erik Andersene49d5ec2000-02-08 19:58:47 +0000531
Erik Andersen1ad302a2000-03-24 00:54:46 +0000532 /* Open the tar file for reading. */
533 if (!strcmp(tarName, "-"))
534 tarFd = fileno(stdin);
535 else
536 tarFd = open(tarName, O_RDONLY);
537 if (tarFd < 0) {
Erik Andersendeea0482000-03-25 23:09:29 +0000538 errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
Erik Andersen1ad302a2000-03-24 00:54:46 +0000539 return ( FALSE);
Erik Andersen06936df2000-01-23 02:14:20 +0000540 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000541
Erik Andersene49d5ec2000-02-08 19:58:47 +0000542 /* Set the umask for this process so it doesn't
Erik Andersen1ad302a2000-03-24 00:54:46 +0000543 * screw up permission setting for us later. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000544 umask(0);
Eric Andersencc8ed391999-10-05 16:24:54 +0000545
Erik Andersen1ad302a2000-03-24 00:54:46 +0000546 /* Read the tar file, and iterate over it one file at a time */
547 while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
Erik Andersene2729152000-02-18 21:34:17 +0000548
Erik Andersen1ad302a2000-03-24 00:54:46 +0000549 /* First, try to read the header */
Erik Andersen3364d782000-03-28 00:58:14 +0000550 if ( readTarHeader(&rawHeader, &header) == FALSE ) {
Erik Andersen1ad302a2000-03-24 00:54:46 +0000551 if ( *(header.name) == '\0' ) {
552 goto endgame;
553 } else {
554 errorFlag=TRUE;
555 errorMsg("Bad tar header, skipping\n");
556 continue;
557 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000558 }
Erik Andersen1ad302a2000-03-24 00:54:46 +0000559 if ( *(header.name) == '\0' )
560 goto endgame;
Erik Andersen0817d132000-04-09 15:17:40 +0000561 header.tarFd = tarFd;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000562
Erik Andersen0817d132000-04-09 15:17:40 +0000563#if defined BB_FEATURE_TAR_EXCLUDE
564 {
565 int skipFlag=FALSE;
566 /* Check for excluded files.... */
567 for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
568 /* Do some extra hoop jumping for when directory names
569 * end in '/' but the entry in tmpList doesn't */
570 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
571 header.name[strlen(header.name)-1]=='/'
572 && strncmp( *tmpList, header.name,
573 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
574 /* If it is a regular file, pretend to extract it with
575 * the extractFlag set to FALSE, so the junk in the tarball
576 * is properly skipped over */
577 if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
578 tarExtractRegularFile(&header, FALSE, FALSE);
579 }
580 skipFlag=TRUE;
581 break;
582 }
583 }
584 /* There are not the droids you're looking for, move along */
585 if (skipFlag==TRUE)
586 continue;
587 }
588#endif
Erik Andersen1ad302a2000-03-24 00:54:46 +0000589 /* Special treatment if the list (-t) flag is on */
590 if (verboseFlag == TRUE && extractFlag == FALSE) {
591 int len, len1;
592 char buf[35];
593 struct tm *tm = localtime (&(header.mtime));
594
Erik Andersen6a34b532000-04-07 06:55:38 +0000595 len=printf("%s ", modeString(header.mode));
596 memset(buf, 0, 8*sizeof(char));
597 my_getpwuid(buf, header.uid);
598 if (! *buf)
599 len+=printf("%d", header.uid);
600 else
601 len+=printf("%s", buf);
602 memset(buf, 0, 8*sizeof(char));
603 my_getgrgid(buf, header.gid);
604 if (! *buf)
605 len+=printf("/%-d ", header.gid);
606 else
607 len+=printf("/%-s ", buf);
608
Erik Andersen1ad302a2000-03-24 00:54:46 +0000609 if (header.type==CHRTYPE || header.type==BLKTYPE) {
610 len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
611 header.devmajor, header.devminor);
612 } else {
Erik Andersen1d1d9502000-04-21 01:26:49 +0000613 len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
Erik Andersen1ad302a2000-03-24 00:54:46 +0000614 }
615 /* Jump through some hoops to make the columns match up */
616 for(;(len+len1)<31;len++)
617 printf(" ");
618 printf(buf);
619
620 /* Use ISO 8610 time format */
621 if (tm) {
622 printf ("%04d-%02d-%02d %02d:%02d:%02d ",
623 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
624 tm->tm_hour, tm->tm_min, tm->tm_sec);
625 }
626 }
627 /* List contents if we are supposed to do that */
628 if (verboseFlag == TRUE || listFlag == TRUE) {
629 /* Now the normal listing */
630 printf("%s", header.name);
Erik Andersen6a34b532000-04-07 06:55:38 +0000631 }
632 if (verboseFlag == TRUE && listFlag == TRUE) {
Erik Andersen1ad302a2000-03-24 00:54:46 +0000633 /* If this is a link, say so */
634 if (header.type==LNKTYPE)
635 printf(" link to %s", header.linkname);
636 else if (header.type==SYMTYPE)
637 printf(" -> %s", header.linkname);
Erik Andersen6a34b532000-04-07 06:55:38 +0000638 }
639 if (verboseFlag == TRUE || listFlag == TRUE) {
Erik Andersen1ad302a2000-03-24 00:54:46 +0000640 printf("\n");
641 }
642
Erik Andersen6a34b532000-04-07 06:55:38 +0000643 /* Remove any clutter lying in our way */
644 unlink( header.name);
Eric Andersencc8ed391999-10-05 16:24:54 +0000645
Erik Andersen1ad302a2000-03-24 00:54:46 +0000646 /* If we got here, we can be certain we have a legitimate
647 * header to work with. So work with it. */
648 switch ( header.type ) {
649 case REGTYPE:
650 case REGTYPE0:
651 /* If the name ends in a '/' then assume it is
652 * supposed to be a directory, and fall through */
653 if (header.name[strlen(header.name)-1] != '/') {
Erik Andersen6a34b532000-04-07 06:55:38 +0000654 if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
655 errorFlag=TRUE;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000656 break;
657 }
658 case DIRTYPE:
Erik Andersen6a34b532000-04-07 06:55:38 +0000659 if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
660 errorFlag=TRUE;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000661 break;
662 case LNKTYPE:
Erik Andersen6a34b532000-04-07 06:55:38 +0000663 if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
664 errorFlag=TRUE;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000665 break;
666 case SYMTYPE:
Erik Andersen6a34b532000-04-07 06:55:38 +0000667 if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
668 errorFlag=TRUE;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000669 break;
670 case CHRTYPE:
671 case BLKTYPE:
672 case FIFOTYPE:
Erik Andersen6a34b532000-04-07 06:55:38 +0000673 if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
674 errorFlag=TRUE;
Erik Andersen1ad302a2000-03-24 00:54:46 +0000675 break;
676 default:
677 close( tarFd);
678 return( FALSE);
679 }
680 }
681 close(tarFd);
682 if (status > 0) {
683 /* Bummer - we read a partial header */
Erik Andersendeea0482000-03-25 23:09:29 +0000684 errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
Erik Andersen1ad302a2000-03-24 00:54:46 +0000685 return ( FALSE);
686 }
Erik Andersen6a34b532000-04-07 06:55:38 +0000687 else if (errorFlag==TRUE) {
688 errorMsg( "tar: Error exit delayed from previous errors\n");
689 return( FALSE);
690 } else
Erik Andersen1ad302a2000-03-24 00:54:46 +0000691 return( status);
692
693 /* Stuff to do when we are done */
694endgame:
695 close( tarFd);
696 if ( *(header.name) == '\0' ) {
Erik Andersen6a34b532000-04-07 06:55:38 +0000697 if (errorFlag==TRUE)
698 errorMsg( "tar: Error exit delayed from previous errors\n");
699 else
Erik Andersen1ad302a2000-03-24 00:54:46 +0000700 return( TRUE);
701 }
702 return( FALSE);
703}
704
Erik Andersen6acaa402000-03-26 14:03:20 +0000705
706#ifdef BB_FEATURE_TAR_CREATE
707
Erik Andersen68a9ea42000-04-04 18:39:50 +0000708/* Some info to be carried along when creating a new tarball */
709struct TarBallInfo
710{
711 char* fileName; /* File name of the tarball */
712 int tarFd; /* Open-for-write file descriptor
713 for the tarball */
714 struct stat statBuf; /* Stat info for the tarball, letting
715 us know the inode and device that the
716 tarball lives, so we can avoid trying
717 to include the tarball into itself */
718 int verboseFlag; /* Whether to print extra stuff or not */
Erik Andersenecd51242000-04-08 03:08:21 +0000719 char** excludeList; /* List of files to not include */
Erik Andersen68a9ea42000-04-04 18:39:50 +0000720};
721typedef struct TarBallInfo TarBallInfo;
722
723
Erik Andersen6acaa402000-03-26 14:03:20 +0000724/* Put an octal string into the specified buffer.
725 * The number is zero and space padded and possibly null padded.
726 * Returns TRUE if successful. */
727static int putOctal (char *cp, int len, long value)
728{
729 int tempLength;
Erik Andersen6acaa402000-03-26 14:03:20 +0000730 char tempBuffer[32];
Erik Andersen5661fe02000-04-05 01:00:52 +0000731 char *tempString = tempBuffer;
Erik Andersen6acaa402000-03-26 14:03:20 +0000732
733 /* Create a string of the specified length with an initial space,
734 * leading zeroes and the octal number, and a trailing null. */
Erik Andersen5661fe02000-04-05 01:00:52 +0000735 sprintf (tempString, "%0*lo", len - 1, value);
Erik Andersen6acaa402000-03-26 14:03:20 +0000736
737 /* If the string is too large, suppress the leading space. */
Erik Andersen5661fe02000-04-05 01:00:52 +0000738 tempLength = strlen (tempString) + 1;
Erik Andersen6acaa402000-03-26 14:03:20 +0000739 if (tempLength > len) {
740 tempLength--;
741 tempString++;
742 }
743
744 /* If the string is still too large, suppress the trailing null. */
745 if (tempLength > len)
746 tempLength--;
747
748 /* If the string is still too large, fail. */
749 if (tempLength > len)
750 return FALSE;
751
752 /* Copy the string to the field. */
753 memcpy (cp, tempString, len);
754
755 return TRUE;
756}
757
Erik Andersen68a9ea42000-04-04 18:39:50 +0000758/* Write out a tar header for the specified file/directory/whatever */
Erik Andersen3364d782000-03-28 00:58:14 +0000759static int
Erik Andersen5661fe02000-04-05 01:00:52 +0000760writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
Erik Andersen6acaa402000-03-26 14:03:20 +0000761{
Erik Andersen5661fe02000-04-05 01:00:52 +0000762 long chksum=0;
763 struct TarHeader header;
Erik Andersen0817d132000-04-09 15:17:40 +0000764#if defined BB_FEATURE_TAR_EXCLUDE
Erik Andersenecd51242000-04-08 03:08:21 +0000765 char** tmpList;
Erik Andersen0817d132000-04-09 15:17:40 +0000766#endif
Erik Andersen5661fe02000-04-05 01:00:52 +0000767 const unsigned char *cp = (const unsigned char *) &header;
768 ssize_t size = sizeof(struct TarHeader);
769
770 memset( &header, 0, size);
Erik Andersen3364d782000-03-28 00:58:14 +0000771
Erik Andersen68a9ea42000-04-04 18:39:50 +0000772 if (*fileName=='/') {
773 static int alreadyWarned=FALSE;
774 if (alreadyWarned==FALSE) {
775 errorMsg("tar: Removing leading '/' from member names\n");
776 alreadyWarned=TRUE;
777 }
Erik Andersen84e09e42000-04-08 20:58:35 +0000778 strncpy(header.name, fileName+1, sizeof(header.name));
Erik Andersen3364d782000-03-28 00:58:14 +0000779 }
Erik Andersen68a9ea42000-04-04 18:39:50 +0000780 else {
Erik Andersen84e09e42000-04-08 20:58:35 +0000781 strncpy(header.name, fileName, sizeof(header.name));
Erik Andersen68a9ea42000-04-04 18:39:50 +0000782 }
Erik Andersen84e09e42000-04-08 20:58:35 +0000783
Erik Andersen0817d132000-04-09 15:17:40 +0000784#if defined BB_FEATURE_TAR_EXCLUDE
785 /* Check for excluded files.... */
Erik Andersenecd51242000-04-08 03:08:21 +0000786 for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
Erik Andersen0817d132000-04-09 15:17:40 +0000787 /* Do some extra hoop jumping for when directory names
788 * end in '/' but the entry in tmpList doesn't */
789 if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
790 header.name[strlen(header.name)-1]=='/'
791 && strncmp( *tmpList, header.name,
792 MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
793 /* Set the mode to something that is not a regular file, thereby
794 * faking out writeTarFile into thinking that nothing further need
795 * be done for this file. Yes, I know this is ugly, but it works. */
796 statbuf->st_mode = 0;
797 return( TRUE);
798 }
Erik Andersenecd51242000-04-08 03:08:21 +0000799 }
Erik Andersen0817d132000-04-09 15:17:40 +0000800#endif
Erik Andersenecd51242000-04-08 03:08:21 +0000801
Erik Andersen5661fe02000-04-05 01:00:52 +0000802 putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
803 putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
804 putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
805 putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
806 putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
807 strncpy(header.magic, TAR_MAGIC TAR_VERSION,
808 TAR_MAGIC_LEN + TAR_VERSION_LEN );
Erik Andersen68a9ea42000-04-04 18:39:50 +0000809
Erik Andersen84e09e42000-04-08 20:58:35 +0000810 /* Enter the user and group names (default to root if it fails) */
Erik Andersen5661fe02000-04-05 01:00:52 +0000811 my_getpwuid(header.uname, statbuf->st_uid);
Erik Andersen5661fe02000-04-05 01:00:52 +0000812 if (! *header.uname)
Erik Andersen84e09e42000-04-08 20:58:35 +0000813 strcpy(header.uname, "root");
Erik Andersen5661fe02000-04-05 01:00:52 +0000814 my_getgrgid(header.gname, statbuf->st_gid);
815 if (! *header.uname)
Erik Andersen84e09e42000-04-08 20:58:35 +0000816 strcpy(header.uname, "root");
Erik Andersen5661fe02000-04-05 01:00:52 +0000817
Erik Andersen95c1c1e2000-04-14 21:45:29 +0000818 /* WARNING/NOTICE: I break Hard Links */
Erik Andersen68a9ea42000-04-04 18:39:50 +0000819 if (S_ISLNK(statbuf->st_mode)) {
Erik Andersen5661fe02000-04-05 01:00:52 +0000820 char buffer[BUFSIZ];
821 header.typeflag = SYMTYPE;
822 if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) {
823 errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
824 return ( FALSE);
825 }
Erik Andersen95c1c1e2000-04-14 21:45:29 +0000826 strncpy(header.linkname, buffer, sizeof(header.linkname));
Erik Andersen68a9ea42000-04-04 18:39:50 +0000827 } else if (S_ISDIR(statbuf->st_mode)) {
Erik Andersen5661fe02000-04-05 01:00:52 +0000828 header.typeflag = DIRTYPE;
829 strncat(header.name, "/", sizeof(header.name));
Erik Andersen68a9ea42000-04-04 18:39:50 +0000830 } else if (S_ISCHR(statbuf->st_mode)) {
Erik Andersen5661fe02000-04-05 01:00:52 +0000831 header.typeflag = CHRTYPE;
832 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
833 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
Erik Andersen68a9ea42000-04-04 18:39:50 +0000834 } else if (S_ISBLK(statbuf->st_mode)) {
Erik Andersen5661fe02000-04-05 01:00:52 +0000835 header.typeflag = BLKTYPE;
836 putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
837 putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
Erik Andersen68a9ea42000-04-04 18:39:50 +0000838 } else if (S_ISFIFO(statbuf->st_mode)) {
Erik Andersen5661fe02000-04-05 01:00:52 +0000839 header.typeflag = FIFOTYPE;
840 } else if (S_ISREG(statbuf->st_mode)) {
841 header.typeflag = REGTYPE;
842 putOctal(header.size, sizeof(header.size), statbuf->st_size);
Erik Andersen68a9ea42000-04-04 18:39:50 +0000843 } else {
Erik Andersen5661fe02000-04-05 01:00:52 +0000844 errorMsg("tar: %s: Unknown file type\n", fileName);
Erik Andersen68a9ea42000-04-04 18:39:50 +0000845 return ( FALSE);
846 }
Erik Andersen68a9ea42000-04-04 18:39:50 +0000847
Erik Andersen5661fe02000-04-05 01:00:52 +0000848 /* Calculate and store the checksum (i.e. the sum of all of the bytes of
849 * the header). The checksum field must be filled with blanks for the
850 * calculation. The checksum field is formatted differently from the
851 * other fields: it has [6] digits, a null, then a space -- rather than
852 * digits, followed by a null like the other fields... */
853 memset(header.chksum, ' ', sizeof(header.chksum));
854 cp = (const unsigned char *) &header;
855 while (size-- > 0)
856 chksum += *cp++;
857 putOctal(header.chksum, 7, chksum);
858
859 /* Now write the header out to disk */
860 if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
861 errorMsg(io_error, fileName, strerror(errno));
862 return ( FALSE);
863 }
864 /* Pad the header up to the tar block size */
865 for (; size<TAR_BLOCK_SIZE; size++) {
866 write(tbInfo->tarFd, "\0", 1);
867 }
868 /* Now do the verbose thing (or not) */
869 if (tbInfo->verboseFlag==TRUE)
870 fprintf(stdout, "%s\n", header.name);
Erik Andersen3364d782000-03-28 00:58:14 +0000871
872 return ( TRUE);
873}
874
875
Erik Andersen68a9ea42000-04-04 18:39:50 +0000876static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
Erik Andersen3364d782000-03-28 00:58:14 +0000877{
Erik Andersen68a9ea42000-04-04 18:39:50 +0000878 struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
Erik Andersen68a9ea42000-04-04 18:39:50 +0000879
880 /* It is against the rules to archive a socket */
881 if (S_ISSOCK(statbuf->st_mode)) {
882 errorMsg("tar: %s: socket ignored\n", fileName);
883 return( TRUE);
884 }
885
886 /* It is a bad idea to store the archive we are in the process of creating,
887 * so check the device and inode to be sure that this particular file isn't
888 * the new tarball */
889 if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
890 tbInfo->statBuf.st_ino == statbuf->st_ino) {
891 errorMsg("tar: %s: file is the archive; skipping\n", fileName);
892 return( TRUE);
893 }
894
Erik Andersen5661fe02000-04-05 01:00:52 +0000895 if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
896 return( FALSE);
Erik Andersen68a9ea42000-04-04 18:39:50 +0000897 }
Erik Andersen5661fe02000-04-05 01:00:52 +0000898
899 /* Now, if the file is a regular file, copy it out to the tarball */
900 if (S_ISREG(statbuf->st_mode)) {
901 int inputFileFd;
902 char buffer[BUFSIZ];
903 ssize_t size=0, readSize=0;
904
905 /* open the file we want to archive, and make sure all is well */
906 if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
907 errorMsg("tar: %s: Cannot open: %s\n", fileName, strerror(errno));
908 return( FALSE);
909 }
910
911 /* write the file to the archive */
912 while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
913 if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
914 /* Output file seems to have a problem */
915 errorMsg(io_error, fileName, strerror(errno));
916 return( FALSE);
917 }
918 readSize+=size;
919 }
920 if (size == -1) {
921 errorMsg(io_error, fileName, strerror(errno));
922 return( FALSE);
923 }
924 /* Pad the file up to the tar block size */
925 for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
926 write(tbInfo->tarFd, "\0", 1);
927 }
928 close( inputFileFd);
929 }
Erik Andersen68a9ea42000-04-04 18:39:50 +0000930
931 return( TRUE);
Erik Andersen6acaa402000-03-26 14:03:20 +0000932}
933
Erik Andersen68a9ea42000-04-04 18:39:50 +0000934static int writeTarFile(const char* tarName, int tostdoutFlag,
Erik Andersenecd51242000-04-08 03:08:21 +0000935 int verboseFlag, int argc, char **argv, char** excludeList)
Erik Andersen6acaa402000-03-26 14:03:20 +0000936{
Erik Andersen3364d782000-03-28 00:58:14 +0000937 int tarFd=-1;
Erik Andersen68a9ea42000-04-04 18:39:50 +0000938 int errorFlag=FALSE;
Erik Andersen5661fe02000-04-05 01:00:52 +0000939 ssize_t size;
Erik Andersen68a9ea42000-04-04 18:39:50 +0000940 struct TarBallInfo tbInfo;
941 tbInfo.verboseFlag = verboseFlag;
Erik Andersen3364d782000-03-28 00:58:14 +0000942
943 /* Make sure there is at least one file to tar up. */
944 if (argc <= 0)
945 fatalError("tar: Cowardly refusing to create an empty archive\n");
Erik Andersen6acaa402000-03-26 14:03:20 +0000946
947 /* Open the tar file for writing. */
Erik Andersen3364d782000-03-28 00:58:14 +0000948 if (tostdoutFlag == TRUE)
Erik Andersen68a9ea42000-04-04 18:39:50 +0000949 tbInfo.tarFd = fileno(stdout);
Erik Andersen6acaa402000-03-26 14:03:20 +0000950 else
Erik Andersen68a9ea42000-04-04 18:39:50 +0000951 tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
952 if (tbInfo.tarFd < 0) {
953 errorMsg( "tar: Error opening '%s': %s\n", tarName, strerror(errno));
Erik Andersen6acaa402000-03-26 14:03:20 +0000954 return ( FALSE);
955 }
Erik Andersenecd51242000-04-08 03:08:21 +0000956 tbInfo.excludeList=excludeList;
Erik Andersen68a9ea42000-04-04 18:39:50 +0000957 /* Store the stat info for the tarball's file, so
958 * can avoid including the tarball into itself.... */
959 if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
Erik Andersen3364d782000-03-28 00:58:14 +0000960 fatalError(io_error, tarName, strerror(errno));
Erik Andersen6acaa402000-03-26 14:03:20 +0000961
962 /* Set the umask for this process so it doesn't
963 * screw up permission setting for us later. */
964 umask(0);
965
966 /* Read the directory/files and iterate over them one at a time */
Erik Andersen3364d782000-03-28 00:58:14 +0000967 while (argc-- > 0) {
968 if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
Erik Andersen68a9ea42000-04-04 18:39:50 +0000969 writeFileToTarball, writeFileToTarball,
970 (void*) &tbInfo) == FALSE) {
971 errorFlag = TRUE;
Erik Andersen3364d782000-03-28 00:58:14 +0000972 }
Erik Andersen6acaa402000-03-26 14:03:20 +0000973 }
Erik Andersen5661fe02000-04-05 01:00:52 +0000974 /* Write two empty blocks to the end of the archive */
975 for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
976 write(tbInfo.tarFd, "\0", 1);
977 }
Erik Andersen0817d132000-04-09 15:17:40 +0000978
979 /* To be pedantically correct, we would check if the tarball
980 * is smaller then 20 tar blocks, and pad it if it was smaller,
981 * but that isn't necessary for GNU tar interoperability, and
982 * so is considered a waste of space */
983
Erik Andersen68a9ea42000-04-04 18:39:50 +0000984 /* Hang up the tools, close up shop, head home */
Erik Andersen6acaa402000-03-26 14:03:20 +0000985 close(tarFd);
Erik Andersen68a9ea42000-04-04 18:39:50 +0000986 if (errorFlag == TRUE) {
987 errorMsg("tar: Error exit delayed from previous errors\n");
988 return(FALSE);
989 }
Erik Andersen6acaa402000-03-26 14:03:20 +0000990 return( TRUE);
991}
992
993
994#endif
995