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hush/archival/tar.c
Glenn L McGrath 2975a34f23 readTarFile changed from exter nto static
2001-04-11 16:49:07 +00:00

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/* 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) 1999,2000,2001 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 <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>
#include <getopt.h>
#include <fnmatch.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include "busybox.h"
#define BB_DECLARE_EXTERN
#define bb_need_io_error
#define bb_need_name_longer_than_foo
#include "messages.c"
/* Tar file constants */
#ifndef MAJOR
#define MAJOR(dev) (((dev)>>8)&0xff)
#define MINOR(dev) ((dev)&0xff)
#endif
enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
/* POSIX tar Header Block, from POSIX 1003.1-1990 */
struct TarHeader
{
/* byte offset */
char name[NAME_SIZE]; /* 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[NAME_SIZE]; /* 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 */
static const int TAR_MAGIC_LEN = 6;
static const int TAR_VERSION_LEN = 2;
static const int 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 */
GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
};
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(int tarFd, int extractFlag, int listFlag,
int tostdoutFlag, int verboseFlag, char** extractList,
char** excludeList);
#ifdef BB_FEATURE_TAR_CREATE
/* Local procedures to save files into a tar file. */
static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
char** excludeList);
#endif
#if defined BB_FEATURE_TAR_EXCLUDE
static struct option longopts[] = {
{ "exclude", 1, NULL, 'e' },
{ NULL, 0, NULL, 0 }
};
#endif
extern int tar_main(int argc, char **argv)
{
char** excludeList=NULL;
char** extractList=NULL;
const char *tarName="-";
#if defined BB_FEATURE_TAR_EXCLUDE
int excludeListSize=0;
FILE *fileList;
char file[256];
#endif
#if defined BB_FEATURE_TAR_GZIP
FILE *comp_file = NULL;
int unzipFlag = FALSE;
#endif
int listFlag = FALSE;
int extractFlag = FALSE;
int createFlag = FALSE;
int verboseFlag = FALSE;
int tostdoutFlag = FALSE;
int status = FALSE;
int opt;
pid_t pid;
if (argc <= 1)
show_usage();
if (argv[1][0] != '-') {
char *tmp = xmalloc(strlen(argv[1]) + 2);
tmp[0] = '-';
strcpy(tmp + 1, argv[1]);
argv[1] = tmp;
}
while (
#ifndef BB_FEATURE_TAR_EXCLUDE
(opt = getopt(argc, argv, "cxtzvOf:"))
#else
(opt = getopt_long(argc, argv, "cxtzvOf:X:", longopts, NULL))
#endif
> 0) {
switch (opt) {
case 'c':
if (extractFlag == TRUE || listFlag == TRUE)
goto flagError;
createFlag = TRUE;
break;
case 'x':
if (listFlag == TRUE || createFlag == TRUE)
goto flagError;
extractFlag = TRUE;
break;
case 't':
if (extractFlag == TRUE || createFlag == TRUE)
goto flagError;
listFlag = TRUE;
break;
#ifdef BB_FEATURE_TAR_GZIP
case 'z':
unzipFlag = TRUE;
break;
#endif
case 'v':
verboseFlag = TRUE;
break;
case 'O':
tostdoutFlag = TRUE;
break;
case 'f':
if (*tarName != '-')
error_msg_and_die( "Only one 'f' option allowed");
tarName = optarg;
break;
#if defined BB_FEATURE_TAR_EXCLUDE
case 'e':
excludeList=xrealloc( excludeList,
sizeof(char *) * (excludeListSize+2));
excludeList[excludeListSize] = optarg;
/* Tack a NULL onto the end of the list */
excludeList[++excludeListSize] = NULL;
case 'X':
fileList = xfopen(optarg, "r");
while (fgets(file, sizeof(file), fileList) != NULL) {
excludeList = xrealloc(excludeList,
sizeof(char *) * (excludeListSize+2));
chomp(file);
excludeList[excludeListSize] = xstrdup(file);
/* Tack a NULL onto the end of the list */
excludeList[++excludeListSize] = NULL;
}
fclose(fileList);
break;
#endif
default:
show_usage();
}
}
/*
* 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
error_msg_and_die( "This version of tar was not compiled with tar creation support.");
#else
#ifdef BB_FEATURE_TAR_GZIP
if (unzipFlag==TRUE)
error_msg_and_die("Creation of compressed not internally support by tar, pipe to busybox gunzip");
#endif
status = writeTarFile(tarName, verboseFlag, argv + optind, excludeList);
#endif
}
if (listFlag == TRUE || extractFlag == TRUE) {
int tarFd;
if (argv[optind])
extractList = argv + optind;
/* Open the tar file for reading. */
if (!strcmp(tarName, "-"))
tarFd = fileno(stdin);
else
tarFd = open(tarName, O_RDONLY);
if (tarFd < 0)
perror_msg_and_die("Error opening '%s'", tarName);
#ifdef BB_FEATURE_TAR_GZIP
/* unzip tarFd in a seperate process */
if (unzipFlag == TRUE) {
comp_file = fdopen(tarFd, "r");
if ((tarFd = gz_open(comp_file, &pid)) == EXIT_FAILURE) {
error_msg_and_die("Couldnt unzip file");
}
}
#endif
status = readTarFile(tarFd, extractFlag, listFlag, tostdoutFlag,
verboseFlag, extractList, excludeList);
close(tarFd);
#ifdef BB_FEATURE_TAR_GZIP
if (unzipFlag == TRUE) {
gz_close(pid);
fclose(comp_file);
}
#endif
}
if (status == TRUE)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
flagError:
error_msg_and_die( "Exactly one of 'c', 'x' or 't' must be specified");
}
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. */
create_path(header->name, 0777);
if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
header->mode & ~S_IFMT)) < 0) {
error_msg(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 = full_read(header->tarFd, buffer, readSize)) <= 0 ) {
/* Tarball seems to have a problem */
error_msg("Unexpected EOF in archive");
return( FALSE);
}
if ( readSize < writeSize )
writeSize = readSize;
/* Write out the file, if we are supposed to be doing that */
if (extractFlag==TRUE) {
if ((actualWriteSz=full_write(outFd, buffer, writeSize)) != writeSize ) {
/* Output file seems to have a problem */
error_msg(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 (create_path(header->name, header->mode) != TRUE) {
perror_msg("%s: Cannot mkdir", header->name);
return( FALSE);
}
/* make the final component, just in case it was
* omitted by create_path() (which will skip the
* directory if it doesn't have a terminating '/') */
if (mkdir(header->name, header->mode) < 0 && errno != EEXIST) {
perror_msg("%s", header->name);
return FALSE;
}
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) {
perror_msg("%s: Cannot create hard link to '%s'", header->name,
header->linkname);
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) {
perror_msg("%s: Cannot create symlink to '%s'", header->name,
header->linkname);
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
error_msg("%s: Cannot create symlink to '%s': %s",
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) {
perror_msg("%s: Cannot mknod", header->name);
return( FALSE);
}
} else if (S_ISFIFO(header->mode)) {
if (mkfifo(header->name, header->mode) < 0) {
perror_msg("%s: Cannot mkfifo", header->name);
return( FALSE);
}
}
/* Now set permissions etc for the new directory */
fixUpPermissions(header);
return( TRUE);
}
/* 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) {
error_msg("Removing leading '/' from member names");
alreadyWarned = TRUE;
}
}
header->mode = strtol(rawHeader->mode, NULL, 8);
header->uid = strtol(rawHeader->uid, NULL, 8);
header->gid = strtol(rawHeader->gid, NULL, 8);
header->size = strtol(rawHeader->size, NULL, 8);
header->mtime = strtol(rawHeader->mtime, NULL, 8);
chksum = strtol(rawHeader->chksum, NULL, 8);
header->type = rawHeader->typeflag;
header->linkname = rawHeader->linkname;
header->devmajor = strtol(rawHeader->devmajor, NULL, 8);
header->devminor = strtol(rawHeader->devminor, NULL, 8);
/* 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);
}
static int exclude_file(char **excluded_files, const char *file)
{
int i;
if (excluded_files == NULL)
return 0;
for (i = 0; excluded_files[i] != NULL; i++) {
if (excluded_files[i][0] == '/') {
if (fnmatch(excluded_files[i], file,
FNM_PATHNAME | FNM_LEADING_DIR) == 0)
return 1;
} else {
const char *p;
for (p = file; p[0] != '\0'; p++) {
if ((p == file || p[-1] == '/') && p[0] != '/' &&
fnmatch(excluded_files[i], p,
FNM_PATHNAME | FNM_LEADING_DIR) == 0)
return 1;
}
}
}
return 0;
}
static int extract_file(char **extract_files, const char *file)
{
int i;
if (extract_files == NULL)
return 1;
for (i = 0; extract_files[i] != NULL; i++) {
if (fnmatch(extract_files[i], file, FNM_LEADING_DIR) == 0)
return 1;
}
return 0;
}
/*
* 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(int tarFd, int extractFlag, int listFlag,
int tostdoutFlag, int verboseFlag, char** extractList,
char** excludeList)
{
int status;
int errorFlag=FALSE;
int skipNextHeaderFlag=FALSE;
TarHeader rawHeader;
TarInfo header;
/* 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 = full_read(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
/* Try to read the header */
if ( readTarHeader(&rawHeader, &header) == FALSE ) {
if ( *(header.name) == '\0' ) {
goto endgame;
} else {
errorFlag=TRUE;
error_msg("Bad tar header, skipping");
continue;
}
}
if ( *(header.name) == '\0' )
goto endgame;
header.tarFd = tarFd;
/* Skip funky extra GNU headers that precede long files */
if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
skipNextHeaderFlag=TRUE;
if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
errorFlag = TRUE;
continue;
}
if ( skipNextHeaderFlag == TRUE ) {
skipNextHeaderFlag=FALSE;
error_msg(name_longer_than_foo, NAME_SIZE);
if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
errorFlag = TRUE;
continue;
}
#if defined BB_FEATURE_TAR_EXCLUDE
if (exclude_file(excludeList, header.name)) {
/* There are not the droids you're looking for, move along */
/* 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 ) {
if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
errorFlag = TRUE;
}
continue;
}
#endif
if (!extract_file(extractList, header.name)) {
/* There are not the droids you're looking for, move along */
/* 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 ) {
if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
errorFlag = TRUE;
}
continue;
}
if (listFlag == TRUE) {
/* Special treatment if the list (-t) flag is on */
if (verboseFlag == TRUE) {
int len, len1;
char buf[35];
struct tm *tm = localtime (&(header.mtime));
len=printf("%s ", mode_string(header.mode));
my_getpwuid(buf, header.uid);
if (! *buf)
len+=printf("%d", header.uid);
else
len+=printf("%s", buf);
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);
}
}
printf("%s", header.name);
if (verboseFlag == TRUE) {
if (header.type==LNKTYPE) /* If this is a link, say so */
printf(" link to %s", header.linkname);
else if (header.type==SYMTYPE)
printf(" -> %s", header.linkname);
}
printf("\n");
}
/* List contents if we are supposed to do that */
if (verboseFlag == TRUE && extractFlag == TRUE) {
/* Now the normal listing */
FILE *vbFd = stdout;
if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
vbFd = stderr;
fprintf(vbFd, "%s\n", header.name);
}
/* Remove files if we would overwrite them */
if (extractFlag == TRUE && tostdoutFlag == FALSE)
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;
#if 0
/* Handled earlier */
case GNULONGNAME:
case GNULONGLINK:
skipNextHeaderFlag=TRUE;
break;
#endif
default:
error_msg("Unknown file type '%c' in tar file", header.type);
close( tarFd);
return( FALSE);
}
}
close(tarFd);
if (status > 0) {
/* Bummer - we read a partial header */
perror_msg("Error reading tar file");
return ( FALSE);
}
else if (errorFlag==TRUE) {
error_msg( "Error exit delayed from previous errors");
return( FALSE);
} else
return( status);
/* Stuff to do when we are done */
endgame:
close( tarFd);
if ( *(header.name) == '\0' ) {
if (errorFlag==TRUE)
error_msg( "Error exit delayed from previous errors");
else
return( TRUE);
}
return( FALSE);
}
#ifdef BB_FEATURE_TAR_CREATE
/*
** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
** the only functions that deal with the HardLinkInfo structure.
** Even these functions use the xxxHardLinkInfo() functions.
*/
typedef struct HardLinkInfo HardLinkInfo;
struct HardLinkInfo
{
HardLinkInfo *next; /* Next entry in list */
dev_t dev; /* Device number */
ino_t ino; /* Inode number */
short linkCount; /* (Hard) Link Count */
char name[1]; /* Start of filename (must be last) */
};
/* 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 */
HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */
HardLinkInfo *hlInfo; /* Hard Link Info for the current file */
};
typedef struct TarBallInfo TarBallInfo;
/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static void
addHardLinkInfo (HardLinkInfo **hlInfoHeadPtr, dev_t dev, ino_t ino,
short linkCount, const char *name)
{
/* Note: hlInfoHeadPtr can never be NULL! */
HardLinkInfo *hlInfo;
hlInfo = (HardLinkInfo *)xmalloc(sizeof(HardLinkInfo)+strlen(name)+1);
if (hlInfo) {
hlInfo->next = *hlInfoHeadPtr;
*hlInfoHeadPtr = hlInfo;
hlInfo->dev = dev;
hlInfo->ino = ino;
hlInfo->linkCount = linkCount;
strcpy(hlInfo->name, name);
}
return;
}
static void
freeHardLinkInfo (HardLinkInfo **hlInfoHeadPtr)
{
HardLinkInfo *hlInfo = NULL;
HardLinkInfo *hlInfoNext = NULL;
if (hlInfoHeadPtr) {
hlInfo = *hlInfoHeadPtr;
while (hlInfo) {
hlInfoNext = hlInfo->next;
free(hlInfo);
hlInfo = hlInfoNext;
}
*hlInfoHeadPtr = NULL;
}
return;
}
/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static HardLinkInfo *
findHardLinkInfo (HardLinkInfo *hlInfo, dev_t dev, ino_t ino)
{
while(hlInfo) {
if ((ino == hlInfo->ino) && (dev == hlInfo->dev))
break;
hlInfo = hlInfo->next;
}
return(hlInfo);
}
/* 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 *header_name,
const char *real_name, struct stat *statbuf)
{
long chksum=0;
struct TarHeader header;
const unsigned char *cp = (const unsigned char *) &header;
ssize_t size = sizeof(struct TarHeader);
memset( &header, 0, size);
strncpy(header.name, header_name, sizeof(header.name));
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");
if (tbInfo->hlInfo) {
/* This is a hard link */
header.typeflag = LNKTYPE;
strncpy(header.linkname, tbInfo->hlInfo->name, sizeof(header.linkname));
} else if (S_ISLNK(statbuf->st_mode)) {
int link_size=0;
char buffer[BUFSIZ];
header.typeflag = SYMTYPE;
link_size = readlink(real_name, buffer, sizeof(buffer) - 1);
if ( link_size < 0) {
perror_msg("Error reading symlink '%s'", header.name);
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 {
error_msg("%s: Unknown file type", real_name);
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=full_write(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) {
error_msg(io_error, real_name, 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) {
FILE *vbFd = stdout;
if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr
vbFd = stderr;
fprintf(vbFd, "%s\n", header.name);
}
return ( TRUE);
}
static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
{
struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData;
const char *header_name;
/*
** Check to see if we are dealing with a hard link.
** If so -
** Treat the first occurance of a given dev/inode as a file while
** treating any additional occurances as hard links. This is done
** by adding the file information to the HardLinkInfo linked list.
*/
tbInfo->hlInfo = NULL;
if (statbuf->st_nlink > 1) {
tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf->st_dev,
statbuf->st_ino);
if (tbInfo->hlInfo == NULL)
addHardLinkInfo (&tbInfo->hlInfoHead, statbuf->st_dev,
statbuf->st_ino, statbuf->st_nlink, fileName);
}
/* It is against the rules to archive a socket */
if (S_ISSOCK(statbuf->st_mode)) {
error_msg("%s: socket ignored", 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) {
error_msg("%s: file is the archive; skipping", fileName);
return( TRUE);
}
header_name = fileName;
while (header_name[0] == '/') {
static int alreadyWarned=FALSE;
if (alreadyWarned==FALSE) {
error_msg("Removing leading '/' from member names");
alreadyWarned=TRUE;
}
header_name++;
}
if (strlen(fileName) >= NAME_SIZE) {
error_msg(name_longer_than_foo, NAME_SIZE);
return ( TRUE);
}
if (header_name[0] == '\0')
return TRUE;
#if defined BB_FEATURE_TAR_EXCLUDE
if (exclude_file(tbInfo->excludeList, header_name)) {
return SKIP;
}
#endif
if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) {
return( FALSE);
}
/* Now, if the file is a regular file, copy it out to the tarball */
if ((tbInfo->hlInfo == NULL)
&& (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) {
error_msg("%s: Cannot open: %s", fileName, strerror(errno));
return( FALSE);
}
/* write the file to the archive */
while ( (size = full_read(inputFileFd, buffer, sizeof(buffer))) > 0 ) {
if (full_write(tbInfo->tarFd, buffer, size) != size ) {
/* Output file seems to have a problem */
error_msg(io_error, fileName, strerror(errno));
return( FALSE);
}
readSize+=size;
}
if (size == -1) {
error_msg(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 verboseFlag, char **argv,
char** excludeList)
{
int tarFd=-1;
int errorFlag=FALSE;
ssize_t size;
struct TarBallInfo tbInfo;
tbInfo.verboseFlag = verboseFlag;
tbInfo.hlInfoHead = NULL;
/* Make sure there is at least one file to tar up. */
if (*argv == NULL)
error_msg_and_die("Cowardly refusing to create an empty archive");
/* Open the tar file for writing. */
if (!strcmp(tarName, "-"))
tbInfo.tarFd = fileno(stdout);
else
tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (tbInfo.tarFd < 0) {
perror_msg( "Error opening '%s'", tarName);
freeHardLinkInfo(&tbInfo.hlInfoHead);
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)
error_msg_and_die(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 (*argv != NULL) {
if (recursive_action(*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 than 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) {
error_msg("Error exit delayed from previous errors");
freeHardLinkInfo(&tbInfo.hlInfoHead);
return(FALSE);
}
freeHardLinkInfo(&tbInfo.hlInfoHead);
return( TRUE);
}
#endif
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