busybox/tar.c
Eric Andersen 3adffb7fc8 readlink(2) does not NULL terminate the buffer it reads in, but tar expected it
to do so.  This caused symlinks stored in tarballs to likely have trailing
crap in the stored symlink named.  Oops.
 -Erik
2000-06-26 10:54:06 +00:00

1006 lines
30 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini tar implementation for busybox
*
* Note, that as of BusyBox-0.43, tar has been completely rewritten from the
* ground up. It still has remnents of the old code lying about, but it is
* very different now (i.e. cleaner, less global variables, etc)
*
* Copyright (C) 2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* Based in part in the tar implementation in sash
* Copyright (c) 1999 by David I. Bell
* Permission is granted to use, distribute, or modify this source,
* provided that this copyright notice remains intact.
* Permission to distribute sash derived code under the GPL has been granted.
*
* Based in part on the tar implementation from busybox-0.28
* Copyright (C) 1995 Bruce Perens
* This is free software under the GNU General Public License.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#define BB_DECLARE_EXTERN
#define bb_need_io_error
#include "messages.c"
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <utime.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
static const char tar_usage[] =
#ifdef BB_FEATURE_TAR_CREATE
"tar -[cxtvO] "
#else
"tar -[xtvO] "
#endif
#if defined BB_FEATURE_TAR_EXCLUDE
"[--exclude File] "
#endif
"[-f tarFile] [FILE] ...\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nCreate, extract, or list files from a tar file. Note that\n"
"this version of tar treats hard links as separate files.\n\n"
"Main operation mode:\n"
#ifdef BB_FEATURE_TAR_CREATE
"\tc\t\tcreate\n"
#endif
"\tx\t\textract\n"
"\tt\t\tlist\n"
"\nFile selection:\n"
"\tf\t\tname of tarfile or \"-\" for stdin\n"
"\tO\t\textract to stdout\n"
#if defined BB_FEATURE_TAR_EXCLUDE
"\t--exclude\tfile to exclude\n"
#endif
"\nInformative output:\n"
"\tv\t\tverbosely list files processed\n"
#endif
;
/* Tar file constants */
#ifndef MAJOR
#define MAJOR(dev) (((dev)>>8)&0xff)
#define MINOR(dev) ((dev)&0xff)
#endif
/* POSIX tar Header Block, from POSIX 1003.1-1990 */
struct TarHeader
{
/* byte offset */
char name[100]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
char gid[8]; /* 116-123 */
char size[12]; /* 124-135 */
char mtime[12]; /* 136-147 */
char chksum[8]; /* 148-155 */
char typeflag; /* 156-156 */
char linkname[100]; /* 157-256 */
char magic[6]; /* 257-262 */
char version[2]; /* 263-264 */
char uname[32]; /* 265-296 */
char gname[32]; /* 297-328 */
char devmajor[8]; /* 329-336 */
char devminor[8]; /* 337-344 */
char prefix[155]; /* 345-499 */
char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */
};
typedef struct TarHeader TarHeader;
/* A few useful constants */
#define TAR_MAGIC "ustar" /* ustar and a null */
#define TAR_VERSION " " /* Be compatable with GNU tar format */
#define TAR_MAGIC_LEN 6
#define TAR_VERSION_LEN 2
#define TAR_BLOCK_SIZE 512
/* A nice enum with all the possible tar file content types */
enum TarFileType
{
REGTYPE = '0', /* regular file */
REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
LNKTYPE = '1', /* hard link */
SYMTYPE = '2', /* symbolic link */
CHRTYPE = '3', /* character special */
BLKTYPE = '4', /* block special */
DIRTYPE = '5', /* directory */
FIFOTYPE = '6', /* FIFO special */
CONTTYPE = '7', /* reserved */
};
typedef enum TarFileType TarFileType;
/* This struct ignores magic, non-numeric user name,
* non-numeric group name, and the checksum, since
* these are all ignored by BusyBox tar. */
struct TarInfo
{
int tarFd; /* An open file descriptor for reading from the tarball */
char * name; /* File name */
mode_t mode; /* Unix mode, including device bits. */
uid_t uid; /* Numeric UID */
gid_t gid; /* Numeric GID */
size_t size; /* Size of file */
time_t mtime; /* Last-modified time */
enum TarFileType type; /* Regular, directory, link, etc */
char * linkname; /* Name for symbolic and hard links */
long devmajor; /* Major number for special device */
long devminor; /* Minor number for special device */
};
typedef struct TarInfo TarInfo;
/* Local procedures to restore files from a tar file. */
static int readTarFile(const char* tarName, int extractFlag, int listFlag,
int tostdoutFlag, int verboseFlag, char** excludeList);
#ifdef BB_FEATURE_TAR_CREATE
/* Local procedures to save files into a tar file. */
static int writeTarFile(const char* tarName, int tostdoutFlag,
int verboseFlag, int argc, char **argv, char** excludeList);
#endif
extern int tar_main(int argc, char **argv)
{
char** excludeList=NULL;
#if defined BB_FEATURE_TAR_EXCLUDE
int excludeListSize=0;
#endif
const char *tarName="-";
int listFlag = FALSE;
int extractFlag = FALSE;
int createFlag = FALSE;
int verboseFlag = FALSE;
int tostdoutFlag = FALSE;
int stopIt;
if (argc <= 1)
usage(tar_usage);
/* Parse any options */
while (--argc > 0 && strspn(*(++argv), "-cxt") >0 ) {
stopIt=FALSE;
while (stopIt==FALSE && *argv && **argv) {
switch (**argv) {
case 'f':
if (--argc == 0) {
fatalError( "Option requires an argument: No file specified\n");
}
if (*tarName != '-')
fatalError( "Only one 'f' option allowed\n");
tarName = *(++argv);
if (tarName == NULL)
fatalError( "Option requires an argument: No file specified\n");
stopIt=TRUE;
break;
case 't':
if (extractFlag == TRUE || createFlag == TRUE)
goto flagError;
listFlag = TRUE;
break;
case 'x':
if (listFlag == TRUE || createFlag == TRUE)
goto flagError;
extractFlag = TRUE;
break;
case 'c':
if (extractFlag == TRUE || listFlag == TRUE)
goto flagError;
createFlag = TRUE;
break;
case 'v':
verboseFlag = TRUE;
break;
case 'O':
tostdoutFlag = TRUE;
tarName = "-";
break;
case '-':
#if defined BB_FEATURE_TAR_EXCLUDE
if (strcmp(*argv, "-exclude")==0) {
if (--argc == 0) {
fatalError( "Option requires an argument: No file specified\n");
}
excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2));
excludeList[excludeListSize] = *(++argv);
/* Remove leading "/"s */
if (*excludeList[excludeListSize] =='/') {
excludeList[excludeListSize] = (excludeList[excludeListSize])+1;
}
if (excludeList[excludeListSize++] == NULL)
fatalError( "Option requires an argument: No file specified\n");
/* Tack a NULL onto the end of the list */
excludeList[excludeListSize] = NULL;
stopIt=TRUE;
break;
}
#endif
if (strcmp(*argv, "-help")==0) {
usage(tar_usage);
}
break;
default:
fatalError( "Unknown tar flag '%c'\n"
"Try `tar --help' for more information\n", **argv);
}
++(*argv);
}
}
/*
* Do the correct type of action supplying the rest of the
* command line arguments as the list of files to process.
*/
if (createFlag == TRUE) {
#ifndef BB_FEATURE_TAR_CREATE
fatalError( "This version of tar was not compiled with tar creation support.\n");
#else
exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList));
#endif
}
if (listFlag == TRUE || extractFlag == TRUE) {
exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList));
}
flagError:
fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
}
static void
fixUpPermissions(TarInfo *header)
{
struct utimbuf t;
/* Now set permissions etc for the new file */
chown(header->name, header->uid, header->gid);
chmod(header->name, header->mode);
/* Reset the time */
t.actime = time(0);
t.modtime = header->mtime;
utime(header->name, &t);
}
static int
tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
{
size_t writeSize;
size_t readSize;
size_t actualWriteSz;
char buffer[BUFSIZ];
size_t size = header->size;
int outFd=fileno(stdout);
/* Open the file to be written, if a file is supposed to be written */
if (extractFlag==TRUE && tostdoutFlag==FALSE) {
/* Create the path to the file, just in case it isn't there...
* This should not screw up path permissions or anything. */
createPath(header->name, 0777);
if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
header->mode & ~S_IFMT)) < 0) {
errorMsg(io_error, header->name, strerror(errno));
return( FALSE);
}
}
/* Write out the file, if we are supposed to be doing that */
while ( size > 0 ) {
actualWriteSz=0;
if ( size > sizeof(buffer) )
writeSize = readSize = sizeof(buffer);
else {
int mod = size % 512;
if ( mod != 0 )
readSize = size + (512 - mod);
else
readSize = size;
writeSize = size;
}
if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) {
/* Tarball seems to have a problem */
errorMsg("tar: Unexpected EOF in archive\n");
return( FALSE);
}
if ( readSize < writeSize )
writeSize = readSize;
/* Write out the file, if we are supposed to be doing that */
if (extractFlag==TRUE) {
if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
/* Output file seems to have a problem */
errorMsg(io_error, header->name, strerror(errno));
return( FALSE);
}
} else {
actualWriteSz=writeSize;
}
size -= actualWriteSz;
}
/* Now we are done writing the file out, so try
* and fix up the permissions and whatnot */
if (extractFlag==TRUE && tostdoutFlag==FALSE) {
close(outFd);
fixUpPermissions(header);
}
return( TRUE);
}
static int
tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
return( TRUE);
if (createPath(header->name, header->mode) != TRUE) {
errorMsg("tar: %s: Cannot mkdir: %s\n",
header->name, strerror(errno));
return( FALSE);
}
/* make the final component, just in case it was
* omitted by createPath() (which will skip the
* directory if it doesn't have a terminating '/') */
if (mkdir(header->name, header->mode) == 0) {
fixUpPermissions(header);
}
return( TRUE);
}
static int
tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
return( TRUE);
if (link(header->linkname, header->name) < 0) {
errorMsg("tar: %s: Cannot create hard link to '%s': %s\n",
header->name, header->linkname, strerror(errno));
return( FALSE);
}
/* Now set permissions etc for the new directory */
fixUpPermissions(header);
return( TRUE);
}
static int
tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
return( TRUE);
#ifdef S_ISLNK
if (symlink(header->linkname, header->name) < 0) {
errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
header->name, header->linkname, strerror(errno));
return( FALSE);
}
/* Try to change ownership of the symlink.
* If libs doesn't support that, don't bother.
* Changing the pointed-to-file is the Wrong Thing(tm).
*/
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
lchown(header->name, header->uid, header->gid);
#endif
/* Do not change permissions or date on symlink,
* since it changes the pointed to file instead. duh. */
#else
errorMsg("tar: %s: Cannot create symlink to '%s': %s\n",
header->name, header->linkname,
"symlinks not supported");
#endif
return( TRUE);
}
static int
tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
{
if (extractFlag==FALSE || tostdoutFlag==TRUE)
return( TRUE);
if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
errorMsg("tar: %s: Cannot mknod: %s\n",
header->name, strerror(errno));
return( FALSE);
}
} else if (S_ISFIFO(header->mode)) {
if (mkfifo(header->name, header->mode) < 0) {
errorMsg("tar: %s: Cannot mkfifo: %s\n",
header->name, strerror(errno));
return( FALSE);
}
}
/* Now set permissions etc for the new directory */
fixUpPermissions(header);
return( TRUE);
}
/* Read an octal value in a field of the specified width, with optional
* spaces on both sides of the number and with an optional null character
* at the end. Returns -1 on an illegal format. */
static long getOctal(const char *cp, int size)
{
long val = 0;
for(;(size > 0) && (*cp == ' '); cp++, size--);
if ((size == 0) || !isOctal(*cp))
return -1;
for(; (size > 0) && isOctal(*cp); size--) {
val = val * 8 + *cp++ - '0';
}
for (;(size > 0) && (*cp == ' '); cp++, size--);
if ((size > 0) && *cp)
return -1;
return val;
}
/* Parse the tar header and fill in the nice struct with the details */
static int
readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
{
int i;
long chksum, sum=0;
unsigned char *s = (unsigned char *)rawHeader;
header->name = rawHeader->name;
/* Check for and relativify any absolute paths */
if ( *(header->name) == '/' ) {
static int alreadyWarned=FALSE;
while (*(header->name) == '/')
++*(header->name);
if (alreadyWarned == FALSE) {
errorMsg("tar: Removing leading '/' from member names\n");
alreadyWarned = TRUE;
}
}
header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode));
header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid));
header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid));
header->size = getOctal(rawHeader->size, sizeof(rawHeader->size));
header->mtime = getOctal(rawHeader->mtime, sizeof(rawHeader->mtime));
chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
header->type = rawHeader->typeflag;
header->linkname = rawHeader->linkname;
header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
/* Check the checksum */
for (i = sizeof(*rawHeader); i-- != 0;) {
sum += *s++;
}
/* Remove the effects of the checksum field (replace
* with blanks for the purposes of the checksum) */
s = rawHeader->chksum;
for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
sum -= *s++;
}
sum += ' ' * sizeof(rawHeader->chksum);
if (sum == chksum )
return ( TRUE);
return( FALSE);
}
/*
* 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), "%lu ", (long)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)) {
int link_size=0;
char buffer[BUFSIZ];
header.typeflag = SYMTYPE;
link_size = readlink(fileName, buffer, sizeof(buffer) - 1);
if ( link_size < 0) {
errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno));
return ( FALSE);
}
buffer[link_size] = '\0';
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