994 lines
30 KiB
C
994 lines
30 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini tar implementation for busybox
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*
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* Note, that as of BusyBox-0.43, tar has been completely rewritten from the
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* ground up. It still has remnents of the old code lying about, but it is
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* very different now (i.e. cleaner, less global variables, etc)
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*
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* Copyright (C) 2000 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* Based in part in the tar implementation in sash
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* Copyright (c) 1999 by David I. Bell
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* Permission is granted to use, distribute, or modify this source,
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* provided that this copyright notice remains intact.
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* Permission to distribute sash derived code under the GPL has been granted.
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*
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* Based in part on the tar implementation from busybox-0.28
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* Copyright (C) 1995 Bruce Perens
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* This is free software under the GNU General Public License.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#define BB_DECLARE_EXTERN
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#define bb_need_io_error
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#include "messages.c"
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#include <stdio.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <time.h>
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#include <utime.h>
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#include <sys/types.h>
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#include <sys/sysmacros.h>
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#include <sys/param.h> /* for PATH_MAX */
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static const char tar_usage[] =
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#ifdef BB_FEATURE_TAR_CREATE
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"tar -[cxtvO] "
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#else
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"tar -[xtvO] "
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#endif
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#if defined BB_FEATURE_TAR_EXCLUDE
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"[--exclude File] "
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#endif
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"[-f tarFile] [FILE] ...\n\n"
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"Create, extract, or list files from a tar file. Note that\n"
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"this version of tar treats hard links as separate files.\n\n"
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"Main operation mode:\n"
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#ifdef BB_FEATURE_TAR_CREATE
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"\tc\t\tcreate\n"
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#endif
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"\tx\t\textract\n"
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"\tt\t\tlist\n"
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"\nFile selection:\n"
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"\tf\t\tname of tarfile or \"-\" for stdin\n"
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"\tO\t\textract to stdout\n"
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#if defined BB_FEATURE_TAR_EXCLUDE
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"\t--exclude\tfile to exclude\n"
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#endif
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"\nInformative output:\n"
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"\tv\t\tverbosely list files processed\n"
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;
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/* Tar file constants */
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#ifndef MAJOR
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#define MAJOR(dev) (((dev)>>8)&0xff)
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#define MINOR(dev) ((dev)&0xff)
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#endif
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/* POSIX tar Header Block, from POSIX 1003.1-1990 */
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struct TarHeader
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{
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/* byte offset */
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char name[100]; /* 0-99 */
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char mode[8]; /* 100-107 */
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char uid[8]; /* 108-115 */
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char gid[8]; /* 116-123 */
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char size[12]; /* 124-135 */
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char mtime[12]; /* 136-147 */
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char chksum[8]; /* 148-155 */
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char typeflag; /* 156-156 */
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char linkname[100]; /* 157-256 */
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char magic[6]; /* 257-262 */
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char version[2]; /* 263-264 */
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char uname[32]; /* 265-296 */
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char gname[32]; /* 297-328 */
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char devmajor[8]; /* 329-336 */
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char devminor[8]; /* 337-344 */
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char prefix[155]; /* 345-499 */
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char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
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};
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typedef struct TarHeader TarHeader;
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/* A few useful constants */
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#define TAR_MAGIC "ustar" /* ustar and a null */
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#define TAR_VERSION " " /* Be compatable with GNU tar format */
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#define TAR_MAGIC_LEN 6
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#define TAR_VERSION_LEN 2
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#define TAR_BLOCK_SIZE 512
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/* A nice enum with all the possible tar file content types */
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enum TarFileType
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{
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REGTYPE = '0', /* regular file */
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REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
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LNKTYPE = '1', /* hard link */
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SYMTYPE = '2', /* symbolic link */
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CHRTYPE = '3', /* character special */
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BLKTYPE = '4', /* block special */
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DIRTYPE = '5', /* directory */
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FIFOTYPE = '6', /* FIFO special */
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CONTTYPE = '7', /* reserved */
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};
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typedef enum TarFileType TarFileType;
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/* This struct ignores magic, non-numeric user name,
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* non-numeric group name, and the checksum, since
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* these are all ignored by BusyBox tar. */
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struct TarInfo
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{
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int tarFd; /* An open file descriptor for reading from the tarball */
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char * name; /* File name */
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mode_t mode; /* Unix mode, including device bits. */
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uid_t uid; /* Numeric UID */
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gid_t gid; /* Numeric GID */
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size_t size; /* Size of file */
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time_t mtime; /* Last-modified time */
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enum TarFileType type; /* Regular, directory, link, etc */
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char * linkname; /* Name for symbolic and hard links */
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long devmajor; /* Major number for special device */
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long devminor; /* Minor number for special device */
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};
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typedef struct TarInfo TarInfo;
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/* Local procedures to restore files from a tar file. */
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static int readTarFile(const char* tarName, int extractFlag, int listFlag,
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int tostdoutFlag, int verboseFlag, char** excludeList);
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#ifdef BB_FEATURE_TAR_CREATE
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/* Local procedures to save files into a tar file. */
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static int writeTarFile(const char* tarName, int tostdoutFlag,
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int verboseFlag, int argc, char **argv, char** excludeList);
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#endif
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extern int tar_main(int argc, char **argv)
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{
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char** excludeList=NULL;
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#if defined BB_FEATURE_TAR_EXCLUDE
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int excludeListSize=0;
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#endif
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const char *tarName=NULL;
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int listFlag = FALSE;
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int extractFlag = FALSE;
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int createFlag = FALSE;
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int verboseFlag = FALSE;
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int tostdoutFlag = FALSE;
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int stopIt;
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if (argc <= 1)
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usage(tar_usage);
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/* Parse any options */
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while (--argc > 0 && (**(++argv) != '\0')) {
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stopIt=FALSE;
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while (stopIt==FALSE && *(++(*argv))) {
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switch (**argv) {
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case 'f':
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if (--argc == 0) {
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fatalError( "Option requires an argument: No file specified\n");
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}
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if (tarName != NULL)
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fatalError( "Only one 'f' option allowed\n");
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tarName = *(++argv);
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if (tarName == NULL)
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fatalError( "Option requires an argument: No file specified\n");
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stopIt=TRUE;
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break;
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case 't':
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if (extractFlag == TRUE || createFlag == TRUE)
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goto flagError;
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listFlag = TRUE;
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break;
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case 'x':
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if (listFlag == TRUE || createFlag == TRUE)
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goto flagError;
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extractFlag = TRUE;
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break;
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case 'c':
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if (extractFlag == TRUE || listFlag == TRUE)
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goto flagError;
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createFlag = TRUE;
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break;
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case 'v':
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verboseFlag = TRUE;
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break;
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case 'O':
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tostdoutFlag = TRUE;
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tarName = "-";
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break;
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case '-':
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#if defined BB_FEATURE_TAR_EXCLUDE
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if (strcmp(*argv, "-exclude")==0) {
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if (--argc == 0) {
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fatalError( "Option requires an argument: No file specified\n");
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}
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excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
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excludeList[excludeListSize] = *(++argv);
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/* Remove leading "/"s */
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if (*excludeList[excludeListSize] =='/') {
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excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
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}
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if (excludeList[excludeListSize++] == NULL)
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fatalError( "Option requires an argument: No file specified\n");
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/* Tack a NULL onto the end of the list */
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excludeList[excludeListSize] = NULL;
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stopIt=TRUE;
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break;
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}
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#endif
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break;
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default:
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fatalError( "Unknown tar flag '%c'\n"
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"Try `tar --help' for more information\n", **argv);
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}
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}
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}
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/*
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* Do the correct type of action supplying the rest of the
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* command line arguments as the list of files to process.
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*/
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if (createFlag == TRUE) {
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#ifndef BB_FEATURE_TAR_CREATE
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fatalError( "This version of tar was not compiled with tar creation support.\n");
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#else
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exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
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#endif
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} else {
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exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
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}
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flagError:
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fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
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}
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static void
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fixUpPermissions(TarInfo *header)
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{
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struct utimbuf t;
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/* Now set permissions etc for the new file */
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chown(header->name, header->uid, header->gid);
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chmod(header->name, header->mode);
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/* Reset the time */
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t.actime = time(0);
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t.modtime = header->mtime;
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utime(header->name, &t);
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}
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static int
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tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
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{
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size_t writeSize;
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size_t readSize;
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size_t actualWriteSz;
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char buffer[BUFSIZ];
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size_t size = header->size;
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int outFd=fileno(stdout);
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/* Open the file to be written, if a file is supposed to be written */
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if (extractFlag==TRUE && tostdoutFlag==FALSE) {
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if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0)
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errorMsg(io_error, header->name, strerror(errno));
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/* Create the path to the file, just in case it isn't there...
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* This should not screw up path permissions or anything. */
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createPath(header->name, 0777);
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}
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/* Write out the file, if we are supposed to be doing that */
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while ( size > 0 ) {
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actualWriteSz=0;
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if ( size > sizeof(buffer) )
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writeSize = readSize = sizeof(buffer);
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else {
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int mod = size % 512;
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if ( mod != 0 )
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readSize = size + (512 - mod);
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else
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readSize = size;
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writeSize = size;
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}
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if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
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/* Tarball seems to have a problem */
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errorMsg("tar: Unexpected EOF in archive\n");
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return( FALSE);
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}
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if ( readSize < writeSize )
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writeSize = readSize;
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/* Write out the file, if we are supposed to be doing that */
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if (extractFlag==TRUE) {
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if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
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/* Output file seems to have a problem */
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errorMsg(io_error, header->name, strerror(errno));
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return( FALSE);
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}
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} else {
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actualWriteSz=writeSize;
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}
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size -= actualWriteSz;
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}
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/* Now we are done writing the file out, so try
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* and fix up the permissions and whatnot */
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if (extractFlag==TRUE && tostdoutFlag==FALSE) {
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close(outFd);
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fixUpPermissions(header);
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}
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return( TRUE);
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}
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static int
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tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
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{
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if (extractFlag==FALSE || tostdoutFlag==TRUE)
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return( TRUE);
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if (createPath(header->name, header->mode) != TRUE) {
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errorMsg("tar: %s: Cannot mkdir: %s\n",
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header->name, strerror(errno));
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return( FALSE);
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}
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/* make the final component, just in case it was
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* omitted by createPath() (which will skip the
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* directory if it doesn't have a terminating '/') */
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if (mkdir(header->name, header->mode) == 0) {
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fixUpPermissions(header);
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}
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return( TRUE);
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}
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static int
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tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
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{
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if (extractFlag==FALSE || tostdoutFlag==TRUE)
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return( TRUE);
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if (link(header->linkname, header->name) < 0) {
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errorMsg("tar: %s: Cannot create hard link to '%s': %s\n",
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header->name, header->linkname, strerror(errno));
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return( FALSE);
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}
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/* Now set permissions etc for the new directory */
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fixUpPermissions(header);
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return( TRUE);
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}
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static int
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tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
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{
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if (extractFlag==FALSE || tostdoutFlag==TRUE)
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return( TRUE);
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#ifdef S_ISLNK
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if (symlink(header->linkname, header->name) < 0) {
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errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
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header->name, header->linkname, strerror(errno));
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return( FALSE);
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}
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/* Try to change ownership of the symlink.
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* If libs doesn't support that, don't bother.
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* Changing the pointed-to-file is the Wrong Thing(tm).
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*/
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#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
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lchown(header->name, header->uid, header->gid);
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#endif
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/* Do not change permissions or date on symlink,
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* since it changes the pointed to file instead. duh. */
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#else
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errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
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header->name, header->linkname,
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"symlinks not supported");
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#endif
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return( TRUE);
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}
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static int
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tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
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{
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if (extractFlag==FALSE || tostdoutFlag==TRUE)
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return( TRUE);
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if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
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if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
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errorMsg("tar: %s: Cannot mknod: %s\n",
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header->name, strerror(errno));
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return( FALSE);
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}
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} else if (S_ISFIFO(header->mode)) {
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if (mkfifo(header->name, header->mode) < 0) {
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errorMsg("tar: %s: Cannot mkfifo: %s\n",
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header->name, strerror(errno));
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return( FALSE);
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}
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}
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/* Now set permissions etc for the new directory */
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fixUpPermissions(header);
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return( TRUE);
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}
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/* Read an octal value in a field of the specified width, with optional
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* spaces on both sides of the number and with an optional null character
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* at the end. Returns -1 on an illegal format. */
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static long getOctal(const char *cp, int size)
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{
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long val = 0;
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for(;(size > 0) && (*cp == ' '); cp++, size--);
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if ((size == 0) || !isOctal(*cp))
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return -1;
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for(; (size > 0) && isOctal(*cp); size--) {
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val = val * 8 + *cp++ - '0';
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}
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for (;(size > 0) && (*cp == ' '); cp++, size--);
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if ((size > 0) && *cp)
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return -1;
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return val;
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}
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/* Parse the tar header and fill in the nice struct with the details */
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static int
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readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
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{
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int i;
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long chksum, sum=0;
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unsigned char *s = (unsigned char *)rawHeader;
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header->name = rawHeader->name;
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/* Check for and relativify any absolute paths */
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if ( *(header->name) == '/' ) {
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static int alreadyWarned=FALSE;
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while (*(header->name) == '/')
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++*(header->name);
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if (alreadyWarned == FALSE) {
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errorMsg("tar: Removing leading '/' from member names\n");
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alreadyWarned = TRUE;
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}
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}
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header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
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header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
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header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
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header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
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header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
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chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
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header->type = rawHeader->typeflag;
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header->linkname = rawHeader->linkname;
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header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
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header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
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/* Check the checksum */
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for (i = sizeof(*rawHeader); i-- != 0;) {
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sum += *s++;
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}
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/* Remove the effects of the checksum field (replace
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* with blanks for the purposes of the checksum) */
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s = rawHeader->chksum;
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for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
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sum -= *s++;
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}
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sum += ' ' * sizeof(rawHeader->chksum);
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if (sum == chksum )
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return ( TRUE);
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return( FALSE);
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}
|
|
|
|
|
|
/*
|
|
* Read a tar file and extract or list the specified files within it.
|
|
* If the list is empty than all files are extracted or listed.
|
|
*/
|
|
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
|
|
int tostdoutFlag, int verboseFlag, char** excludeList)
|
|
{
|
|
int status, tarFd=-1;
|
|
int errorFlag=FALSE;
|
|
TarHeader rawHeader;
|
|
TarInfo header;
|
|
#if defined BB_FEATURE_TAR_EXCLUDE
|
|
char** tmpList;
|
|
#endif
|
|
|
|
/* Open the tar file for reading. */
|
|
if (!strcmp(tarName, "-"))
|
|
tarFd = fileno(stdin);
|
|
else
|
|
tarFd = open(tarName, O_RDONLY);
|
|
if (tarFd < 0) {
|
|
errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
|
|
return ( FALSE);
|
|
}
|
|
|
|
/* Set the umask for this process so it doesn't
|
|
* screw up permission setting for us later. */
|
|
umask(0);
|
|
|
|
/* Read the tar file, and iterate over it one file at a time */
|
|
while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
|
|
|
|
/* First, try to read the header */
|
|
if ( readTarHeader(&rawHeader, &header) == FALSE ) {
|
|
if ( *(header.name) == '\0' ) {
|
|
goto endgame;
|
|
} else {
|
|
errorFlag=TRUE;
|
|
errorMsg("Bad tar header, skipping\n");
|
|
continue;
|
|
}
|
|
}
|
|
if ( *(header.name) == '\0' )
|
|
goto endgame;
|
|
header.tarFd = tarFd;
|
|
|
|
#if defined BB_FEATURE_TAR_EXCLUDE
|
|
{
|
|
int skipFlag=FALSE;
|
|
/* Check for excluded files.... */
|
|
for (tmpList=excludeList; tmpList && *tmpList; tmpList++) {
|
|
/* Do some extra hoop jumping for when directory names
|
|
* end in '/' but the entry in tmpList doesn't */
|
|
if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
|
|
header.name[strlen(header.name)-1]=='/'
|
|
&& strncmp( *tmpList, header.name,
|
|
MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
|
|
/* If it is a regular file, pretend to extract it with
|
|
* the extractFlag set to FALSE, so the junk in the tarball
|
|
* is properly skipped over */
|
|
if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
|
|
tarExtractRegularFile(&header, FALSE, FALSE);
|
|
}
|
|
skipFlag=TRUE;
|
|
break;
|
|
}
|
|
}
|
|
/* There are not the droids you're looking for, move along */
|
|
if (skipFlag==TRUE)
|
|
continue;
|
|
}
|
|
#endif
|
|
/* Special treatment if the list (-t) flag is on */
|
|
if (verboseFlag == TRUE && extractFlag == FALSE) {
|
|
int len, len1;
|
|
char buf[35];
|
|
struct tm *tm = localtime (&(header.mtime));
|
|
|
|
len=printf("%s ", modeString(header.mode));
|
|
memset(buf, 0, 8*sizeof(char));
|
|
my_getpwuid(buf, header.uid);
|
|
if (! *buf)
|
|
len+=printf("%d", header.uid);
|
|
else
|
|
len+=printf("%s", buf);
|
|
memset(buf, 0, 8*sizeof(char));
|
|
my_getgrgid(buf, header.gid);
|
|
if (! *buf)
|
|
len+=printf("/%-d ", header.gid);
|
|
else
|
|
len+=printf("/%-s ", buf);
|
|
|
|
if (header.type==CHRTYPE || header.type==BLKTYPE) {
|
|
len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
|
|
header.devmajor, header.devminor);
|
|
} else {
|
|
len1=snprintf(buf, sizeof(buf), "%d ", header.size);
|
|
}
|
|
/* Jump through some hoops to make the columns match up */
|
|
for(;(len+len1)<31;len++)
|
|
printf(" ");
|
|
printf(buf);
|
|
|
|
/* Use ISO 8610 time format */
|
|
if (tm) {
|
|
printf ("%04d-%02d-%02d %02d:%02d:%02d ",
|
|
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
|
|
tm->tm_hour, tm->tm_min, tm->tm_sec);
|
|
}
|
|
}
|
|
/* List contents if we are supposed to do that */
|
|
if (verboseFlag == TRUE || listFlag == TRUE) {
|
|
/* Now the normal listing */
|
|
printf("%s", header.name);
|
|
}
|
|
if (verboseFlag == TRUE && listFlag == TRUE) {
|
|
/* If this is a link, say so */
|
|
if (header.type==LNKTYPE)
|
|
printf(" link to %s", header.linkname);
|
|
else if (header.type==SYMTYPE)
|
|
printf(" -> %s", header.linkname);
|
|
}
|
|
if (verboseFlag == TRUE || listFlag == TRUE) {
|
|
printf("\n");
|
|
}
|
|
|
|
/* Remove any clutter lying in our way */
|
|
unlink( header.name);
|
|
|
|
/* If we got here, we can be certain we have a legitimate
|
|
* header to work with. So work with it. */
|
|
switch ( header.type ) {
|
|
case REGTYPE:
|
|
case REGTYPE0:
|
|
/* If the name ends in a '/' then assume it is
|
|
* supposed to be a directory, and fall through */
|
|
if (header.name[strlen(header.name)-1] != '/') {
|
|
if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
|
|
errorFlag=TRUE;
|
|
break;
|
|
}
|
|
case DIRTYPE:
|
|
if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
|
|
errorFlag=TRUE;
|
|
break;
|
|
case LNKTYPE:
|
|
if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
|
|
errorFlag=TRUE;
|
|
break;
|
|
case SYMTYPE:
|
|
if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
|
|
errorFlag=TRUE;
|
|
break;
|
|
case CHRTYPE:
|
|
case BLKTYPE:
|
|
case FIFOTYPE:
|
|
if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
|
|
errorFlag=TRUE;
|
|
break;
|
|
default:
|
|
close( tarFd);
|
|
return( FALSE);
|
|
}
|
|
}
|
|
close(tarFd);
|
|
if (status > 0) {
|
|
/* Bummer - we read a partial header */
|
|
errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno));
|
|
return ( FALSE);
|
|
}
|
|
else if (errorFlag==TRUE) {
|
|
errorMsg( "tar: Error exit delayed from previous errors\n");
|
|
return( FALSE);
|
|
} else
|
|
return( status);
|
|
|
|
/* Stuff to do when we are done */
|
|
endgame:
|
|
close( tarFd);
|
|
if ( *(header.name) == '\0' ) {
|
|
if (errorFlag==TRUE)
|
|
errorMsg( "tar: Error exit delayed from previous errors\n");
|
|
else
|
|
return( TRUE);
|
|
}
|
|
return( FALSE);
|
|
}
|
|
|
|
|
|
#ifdef BB_FEATURE_TAR_CREATE
|
|
|
|
/* Some info to be carried along when creating a new tarball */
|
|
struct TarBallInfo
|
|
{
|
|
char* fileName; /* File name of the tarball */
|
|
int tarFd; /* Open-for-write file descriptor
|
|
for the tarball */
|
|
struct stat statBuf; /* Stat info for the tarball, letting
|
|
us know the inode and device that the
|
|
tarball lives, so we can avoid trying
|
|
to include the tarball into itself */
|
|
int verboseFlag; /* Whether to print extra stuff or not */
|
|
char** excludeList; /* List of files to not include */
|
|
};
|
|
typedef struct TarBallInfo TarBallInfo;
|
|
|
|
|
|
/* Put an octal string into the specified buffer.
|
|
* The number is zero and space padded and possibly null padded.
|
|
* Returns TRUE if successful. */
|
|
static int putOctal (char *cp, int len, long value)
|
|
{
|
|
int tempLength;
|
|
char tempBuffer[32];
|
|
char *tempString = tempBuffer;
|
|
|
|
/* Create a string of the specified length with an initial space,
|
|
* leading zeroes and the octal number, and a trailing null. */
|
|
sprintf (tempString, "%0*lo", len - 1, value);
|
|
|
|
/* If the string is too large, suppress the leading space. */
|
|
tempLength = strlen (tempString) + 1;
|
|
if (tempLength > len) {
|
|
tempLength--;
|
|
tempString++;
|
|
}
|
|
|
|
/* If the string is still too large, suppress the trailing null. */
|
|
if (tempLength > len)
|
|
tempLength--;
|
|
|
|
/* If the string is still too large, fail. */
|
|
if (tempLength > len)
|
|
return FALSE;
|
|
|
|
/* Copy the string to the field. */
|
|
memcpy (cp, tempString, len);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* Write out a tar header for the specified file/directory/whatever */
|
|
static int
|
|
writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf)
|
|
{
|
|
long chksum=0;
|
|
struct TarHeader header;
|
|
#if defined BB_FEATURE_TAR_EXCLUDE
|
|
char** tmpList;
|
|
#endif
|
|
const unsigned char *cp = (const unsigned char *) &header;
|
|
ssize_t size = sizeof(struct TarHeader);
|
|
|
|
memset( &header, 0, size);
|
|
|
|
if (*fileName=='/') {
|
|
static int alreadyWarned=FALSE;
|
|
if (alreadyWarned==FALSE) {
|
|
errorMsg("tar: Removing leading '/' from member names\n");
|
|
alreadyWarned=TRUE;
|
|
}
|
|
strncpy(header.name, fileName+1, sizeof(header.name));
|
|
}
|
|
else {
|
|
strncpy(header.name, fileName, sizeof(header.name));
|
|
}
|
|
|
|
#if defined BB_FEATURE_TAR_EXCLUDE
|
|
/* Check for excluded files.... */
|
|
for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
|
|
/* Do some extra hoop jumping for when directory names
|
|
* end in '/' but the entry in tmpList doesn't */
|
|
if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || (
|
|
header.name[strlen(header.name)-1]=='/'
|
|
&& strncmp( *tmpList, header.name,
|
|
MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) {
|
|
/* Set the mode to something that is not a regular file, thereby
|
|
* faking out writeTarFile into thinking that nothing further need
|
|
* be done for this file. Yes, I know this is ugly, but it works. */
|
|
statbuf->st_mode = 0;
|
|
return( TRUE);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
putOctal(header.mode, sizeof(header.mode), statbuf->st_mode);
|
|
putOctal(header.uid, sizeof(header.uid), statbuf->st_uid);
|
|
putOctal(header.gid, sizeof(header.gid), statbuf->st_gid);
|
|
putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */
|
|
putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime);
|
|
strncpy(header.magic, TAR_MAGIC TAR_VERSION,
|
|
TAR_MAGIC_LEN + TAR_VERSION_LEN );
|
|
|
|
/* Enter the user and group names (default to root if it fails) */
|
|
my_getpwuid(header.uname, statbuf->st_uid);
|
|
if (! *header.uname)
|
|
strcpy(header.uname, "root");
|
|
my_getgrgid(header.gname, statbuf->st_gid);
|
|
if (! *header.uname)
|
|
strcpy(header.uname, "root");
|
|
|
|
/* WARNING/NOTICE: I break Hard Links */
|
|
if (S_ISLNK(statbuf->st_mode)) {
|
|
char buffer[BUFSIZ];
|
|
header.typeflag = SYMTYPE;
|
|
if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) {
|
|
errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
|
|
return ( FALSE);
|
|
}
|
|
strncpy(header.linkname, buffer, sizeof(header.linkname));
|
|
} else if (S_ISDIR(statbuf->st_mode)) {
|
|
header.typeflag = DIRTYPE;
|
|
strncat(header.name, "/", sizeof(header.name));
|
|
} else if (S_ISCHR(statbuf->st_mode)) {
|
|
header.typeflag = CHRTYPE;
|
|
putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
|
|
putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
|
|
} else if (S_ISBLK(statbuf->st_mode)) {
|
|
header.typeflag = BLKTYPE;
|
|
putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev));
|
|
putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev));
|
|
} else if (S_ISFIFO(statbuf->st_mode)) {
|
|
header.typeflag = FIFOTYPE;
|
|
} else if (S_ISREG(statbuf->st_mode)) {
|
|
header.typeflag = REGTYPE;
|
|
putOctal(header.size, sizeof(header.size), statbuf->st_size);
|
|
} else {
|
|
errorMsg("tar: %s: Unknown file type\n", fileName);
|
|
return ( FALSE);
|
|
}
|
|
|
|
/* Calculate and store the checksum (i.e. the sum of all of the bytes of
|
|
* the header). The checksum field must be filled with blanks for the
|
|
* calculation. The checksum field is formatted differently from the
|
|
* other fields: it has [6] digits, a null, then a space -- rather than
|
|
* digits, followed by a null like the other fields... */
|
|
memset(header.chksum, ' ', sizeof(header.chksum));
|
|
cp = (const unsigned char *) &header;
|
|
while (size-- > 0)
|
|
chksum += *cp++;
|
|
putOctal(header.chksum, 7, chksum);
|
|
|
|
/* Now write the header out to disk */
|
|
if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
|
|
errorMsg(io_error, fileName, strerror(errno));
|
|
return ( FALSE);
|
|
}
|
|
/* Pad the header up to the tar block size */
|
|
for (; size<TAR_BLOCK_SIZE; size++) {
|
|
write(tbInfo->tarFd, "\0", 1);
|
|
}
|
|
/* Now do the verbose thing (or not) */
|
|
if (tbInfo->verboseFlag==TRUE)
|
|
fprintf(stdout, "%s\n", header.name);
|
|
|
|
return ( TRUE);
|
|
}
|
|
|
|
|
|
static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
|
|
{
|
|
struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
|
|
|
|
/* It is against the rules to archive a socket */
|
|
if (S_ISSOCK(statbuf->st_mode)) {
|
|
errorMsg("tar: %s: socket ignored\n", fileName);
|
|
return( TRUE);
|
|
}
|
|
|
|
/* It is a bad idea to store the archive we are in the process of creating,
|
|
* so check the device and inode to be sure that this particular file isn't
|
|
* the new tarball */
|
|
if (tbInfo->statBuf.st_dev == statbuf->st_dev &&
|
|
tbInfo->statBuf.st_ino == statbuf->st_ino) {
|
|
errorMsg("tar: %s: file is the archive; skipping\n", fileName);
|
|
return( TRUE);
|
|
}
|
|
|
|
if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) {
|
|
return( FALSE);
|
|
}
|
|
|
|
/* Now, if the file is a regular file, copy it out to the tarball */
|
|
if (S_ISREG(statbuf->st_mode)) {
|
|
int inputFileFd;
|
|
char buffer[BUFSIZ];
|
|
ssize_t size=0, readSize=0;
|
|
|
|
/* open the file we want to archive, and make sure all is well */
|
|
if ((inputFileFd = open(fileName, O_RDONLY)) < 0) {
|
|
errorMsg("tar: %s: Cannot open: %s\n", fileName, strerror(errno));
|
|
return( FALSE);
|
|
}
|
|
|
|
/* write the file to the archive */
|
|
while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
|
|
if (fullWrite(tbInfo->tarFd, buffer, size) != size ) {
|
|
/* Output file seems to have a problem */
|
|
errorMsg(io_error, fileName, strerror(errno));
|
|
return( FALSE);
|
|
}
|
|
readSize+=size;
|
|
}
|
|
if (size == -1) {
|
|
errorMsg(io_error, fileName, strerror(errno));
|
|
return( FALSE);
|
|
}
|
|
/* Pad the file up to the tar block size */
|
|
for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) {
|
|
write(tbInfo->tarFd, "\0", 1);
|
|
}
|
|
close( inputFileFd);
|
|
}
|
|
|
|
return( TRUE);
|
|
}
|
|
|
|
static int writeTarFile(const char* tarName, int tostdoutFlag,
|
|
int verboseFlag, int argc, char **argv, char** excludeList)
|
|
{
|
|
int tarFd=-1;
|
|
int errorFlag=FALSE;
|
|
ssize_t size;
|
|
struct TarBallInfo tbInfo;
|
|
tbInfo.verboseFlag = verboseFlag;
|
|
|
|
/* Make sure there is at least one file to tar up. */
|
|
if (argc <= 0)
|
|
fatalError("tar: Cowardly refusing to create an empty archive\n");
|
|
|
|
/* Open the tar file for writing. */
|
|
if (tostdoutFlag == TRUE)
|
|
tbInfo.tarFd = fileno(stdout);
|
|
else
|
|
tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
|
|
if (tbInfo.tarFd < 0) {
|
|
errorMsg( "tar: Error opening '%s': %s\n", tarName, strerror(errno));
|
|
return ( FALSE);
|
|
}
|
|
tbInfo.excludeList=excludeList;
|
|
/* Store the stat info for the tarball's file, so
|
|
* can avoid including the tarball into itself.... */
|
|
if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0)
|
|
fatalError(io_error, tarName, strerror(errno));
|
|
|
|
/* Set the umask for this process so it doesn't
|
|
* screw up permission setting for us later. */
|
|
umask(0);
|
|
|
|
/* Read the directory/files and iterate over them one at a time */
|
|
while (argc-- > 0) {
|
|
if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
|
|
writeFileToTarball, writeFileToTarball,
|
|
(void*) &tbInfo) == FALSE) {
|
|
errorFlag = TRUE;
|
|
}
|
|
}
|
|
/* Write two empty blocks to the end of the archive */
|
|
for (size=0; size<(2*TAR_BLOCK_SIZE); size++) {
|
|
write(tbInfo.tarFd, "\0", 1);
|
|
}
|
|
|
|
/* To be pedantically correct, we would check if the tarball
|
|
* is smaller then 20 tar blocks, and pad it if it was smaller,
|
|
* but that isn't necessary for GNU tar interoperability, and
|
|
* so is considered a waste of space */
|
|
|
|
/* Hang up the tools, close up shop, head home */
|
|
close(tarFd);
|
|
if (errorFlag == TRUE) {
|
|
errorMsg("tar: Error exit delayed from previous errors\n");
|
|
return(FALSE);
|
|
}
|
|
return( TRUE);
|
|
}
|
|
|
|
|
|
#endif
|
|
|