/*
* 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 pretty
- * different (i.e. cleaner, less global variables, etc)
+ * 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>
#include <sys/param.h> /* for PATH_MAX */
-#ifdef BB_FEATURE_TAR_CREATE
-
static const char tar_usage[] =
- "tar -[cxtvOf] [tarFile] [-X excludeFile] [FILE] ...\n\n"
- "Create, extract, or list files from a tar file. Note that\n"
- "this version of tar packs hard links as separate files.\n\n"
- "Options:\n"
-
- "\tc=create, x=extract, t=list contents, v=verbose,\n"
- "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n"
- "\tX=exclude file\n";
-
+#ifdef BB_FEATURE_TAR_CREATE
+ "tar -[cxtvO] "
#else
-
-static const char tar_usage[] =
- "tar -[xtvO] [-f tarFile] [-X excludeFile] [FILE] ...\n\n"
- "Extract, or list files stored in a tar file. This\n"
- "version of tar does not support creation of tar files.\n\n"
- "Options:\n"
-
- "\tx=extract, t=list contents, v=verbose,\n"
- "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n"
- "\tX=exclude file\n";
-
-
+ "tar -[xtvO] "
#endif
-
+#if defined BB_FEATURE_TAR_EXCLUDE
+ "[--exclude File] "
+#endif
+ "[-f tarFile] [FILE] ...\n\n"
+ "Create, 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"
+ "File 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
+ "Informative output:\n"
+ "\tv\t\tverbosely list files processed\n"
+ ;
/* Tar file constants */
#ifndef MAJOR
struct TarHeader
{
/* byte offset */
- char name[100]; /* 0 */
- char mode[8]; /* 100 */
- char uid[8]; /* 108 */
- char gid[8]; /* 116 */
- char size[12]; /* 124 */
- char mtime[12]; /* 136 */
- char chksum[8]; /* 148 */
- char typeflag; /* 156 */
- char linkname[100]; /* 157 */
- char magic[6]; /* 257 */
- char version[2]; /* 263 */
- char uname[32]; /* 265 */
- char gname[32]; /* 297 */
- char devmajor[8]; /* 329 */
- char devminor[8]; /* 337 */
- char prefix[155]; /* 345 */
- /* padding 500 */
+ 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 "00" /* 00 and no null */
-#define TAR_VERSION " " /* Be compatable with old GNU format */
+#define TAR_VERSION " " /* Be compatable with GNU tar format */
#define TAR_MAGIC_LEN 6
#define TAR_VERSION_LEN 2
#define TAR_BLOCK_SIZE 512
};
typedef struct TarInfo TarInfo;
-/* Static data */
-static const unsigned long TarChecksumOffset = (const unsigned long)&(((TarHeader *)0)->chksum);
-
-
/* 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);
extern int tar_main(int argc, char **argv)
{
char** excludeList=NULL;
+#if defined BB_FEATURE_TAR_EXCLUDE
int excludeListSize=0;
+#endif
const char *tarName=NULL;
int listFlag = FALSE;
int extractFlag = FALSE;
tostdoutFlag = TRUE;
tarName = "-";
break;
- case 'X':
- if (--argc == 0) {
- fatalError( "Option requires an argument: No file specified\n");
- }
- excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+1));
- 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");
- stopIt=TRUE;
- 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
usage(tar_usage);
break;
}
}
}
-#if 0
- for (i=0; i<excludeListSize; i++) {
- printf( "%s\n", excludeList[i]);
- fflush(stdout);
- }
-#endif
-
/*
* Do the correct type of action supplying the rest of the
errorMsg(io_error, header->name, strerror(errno));
return( FALSE);
}
+ } else {
+ actualWriteSz=writeSize;
}
size -= actualWriteSz;
readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
{
int i;
- long chksum, sum;
+ 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->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
/* Check the checksum */
- sum = ' ' * sizeof(rawHeader->chksum);
- for ( i = TarChecksumOffset; i > 0; i-- )
- sum += *s++;
- s += sizeof(rawHeader->chksum);
- for ( i = (512 - TarChecksumOffset - sizeof(rawHeader->chksum)); i > 0; i-- )
+ 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 readTarFile(const char* tarName, int extractFlag, int listFlag,
int tostdoutFlag, int verboseFlag, char** excludeList)
{
- int status, tarFd=0;
+ int status, tarFd=-1;
int errorFlag=FALSE;
TarHeader rawHeader;
TarInfo header;
- int alreadyWarned=FALSE;
- //int skipFileFlag=FALSE;
+#if defined BB_FEATURE_TAR_EXCLUDE
+ char** tmpList;
+#endif
/* Open the tar file for reading. */
if (!strcmp(tarName, "-"))
/* First, try to read the header */
if ( readTarHeader(&rawHeader, &header) == FALSE ) {
- close( tarFd);
if ( *(header.name) == '\0' ) {
goto endgame;
} else {
}
if ( *(header.name) == '\0' )
goto endgame;
-
- /* Check for and relativify any absolute paths */
- if ( *(header.name) == '/' ) {
-
- while (*(header.name) == '/')
- ++*(header.name);
-
- if (alreadyWarned == FALSE) {
- errorMsg("Absolute path detected, removing leading slashes\n");
- alreadyWarned = TRUE;
+ 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;
printf("\n");
}
-#if 0
- /* See if we want to restore this file or not */
- skipFileFlag=FALSE;
- if (wantFileName(outName) == FALSE) {
- skipFileFlag = TRUE;
- }
-#endif
/* Remove any clutter lying in our way */
unlink( header.name);
{
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);
errorMsg("tar: Removing leading '/' from member names\n");
alreadyWarned=TRUE;
}
- strcpy(header.name, fileName+1);
+ strncpy(header.name, fileName+1, sizeof(header.name));
}
else {
- strcpy(header.name, fileName);
+ strncpy(header.name, fileName, sizeof(header.name));
}
-#if 0
- /* Now that leading '/''s have been removed */
+
+#if defined BB_FEATURE_TAR_EXCLUDE
+ /* Check for excluded files.... */
for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) {
- printf( "comparing '%s' and '%s'", *tmpList, header.name);
- if (strcmp( *tmpList, header.name)==0)
- printf( ": match\n");
- else
- printf( "\n");
+ /* 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
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);
- /* Put some sort of sane fallback in place... */
if (! *header.uname)
- strncpy(header.uname, "root", 5);
+ strcpy(header.uname, "root");
my_getgrgid(header.gname, statbuf->st_gid);
if (! *header.uname)
- strncpy(header.uname, "root", 5);
+ strcpy(header.uname, "root");
- // FIXME: (or most likely not) I break Hard Links
+ /* WARNING/NOTICE: I break Hard Links */
if (S_ISLNK(statbuf->st_mode)) {
char buffer[BUFSIZ];
header.typeflag = SYMTYPE;
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) {
projects / oweals / busybox.git / blobdiff