/* vi: set sw=4 ts=4: */
/*
+ * Mini tar implementation for busybox
*
- * 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)
+ * Modifed to use common extraction code used by ar, cpio, dpkg-deb, dpkg
+ * Glenn McGrath <bug1@optushome.com.au>
*
- * Copyright (C) 1999 by Lineo, inc.
+ * 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
* 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 in busybox-0.28
+ * 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.
*
*
*/
-
-#include "internal.h"
-#define BB_DECLARE_EXTERN
-#define bb_need_io_error
-#include "messages.c"
+#include <fcntl.h>
+#include <getopt.h>
+#include <search.h>
#include <stdio.h>
-#include <dirent.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fnmatch.h>
+#include <string.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 <sys/param.h> /* for PATH_MAX */
-
+#include "busybox.h"
#ifdef BB_FEATURE_TAR_CREATE
-static const char tar_usage[] =
- "tar -[cxtvOf] [tarFileName] [FILE] ...\n\n"
- "Create, extract, or list files from a tar file.\n\n"
- "Options:\n"
-
- "\tc=create, x=extract, t=list contents, v=verbose,\n"
- "\tO=extract to stdout, f=tarfile or \"-\" for stdin\n";
-
-#else
-
-static const char tar_usage[] =
- "tar -[xtvOf] [tarFileName] [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";
-
-#endif
-
-
/* Tar file constants */
-#ifndef MAJOR
-#define MAJOR(dev) (((dev)>>8)&0xff)
-#define MINOR(dev) ((dev)&0xff)
-#endif
+# define TAR_MAGIC "ustar" /* ustar and a null */
+# define TAR_VERSION " " /* Be compatable with GNU tar format */
+# ifndef MAJOR
+# define MAJOR(dev) (((dev)>>8)&0xff)
+# define MINOR(dev) ((dev)&0xff)
+# endif
+
+static const int TAR_BLOCK_SIZE = 512;
+static const int TAR_MAGIC_LEN = 6;
+static const int TAR_VERSION_LEN = 2;
/* POSIX tar Header Block, from POSIX 1003.1-1990 */
+enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
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 */
+{ /* 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;
+/*
+** 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) */
+};
-/* A few useful constants */
-#define TAR_MAGIC "ustar" /* ustar and a null */
-#define TAR_VERSION "00" /* 00 and no null */
-#define TAR_MAGIC_LEN 6
-#define TAR_VERSION_LEN 2
-#define TAR_NAME_LEN 100
-#define TAR_BLOCK_SIZE 512
+/* 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;
/* A nice enum with all the possible tar file content types */
enum TarFileType
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;
-
-/* 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);
-
-
-
-#ifdef BB_FEATURE_TAR_CREATE
-/* Local procedures to save files into a tar file. */
-static int writeTarFile(const char* tarName, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, int argc, char **argv);
-static int putOctal(char *cp, int len, long value);
-
-#endif
-
-
-extern int tar_main(int argc, char **argv)
-{
- const char *tarName=NULL;
- const char *options;
- int listFlag = FALSE;
- int extractFlag = FALSE;
- int createFlag = FALSE;
- int verboseFlag = FALSE;
- int tostdoutFlag = FALSE;
-
- argc--;
- argv++;
-
- if (argc < 1)
- usage(tar_usage);
-
- /* Parse options */
- if (**argv == '-')
- options = (*argv++) + 1;
- else
- options = (*argv++);
- argc--;
-
- for (; *options; options++) {
- switch (*options) {
- case 'f':
- if (tarName != NULL)
- fatalError( "Only one 'f' option allowed\n");
-
- tarName = *argv++;
- if (tarName == NULL)
- fatalError( "Option requires an argument: No file specified\n");
- argc--;
-
- 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 '-':
- usage(tar_usage);
- break;
-
- default:
- fatalError( "Unknown tar flag '%c'\n"
- "Try `tar --help' for more information\n", *options);
- }
- }
-
- /*
- * 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, extractFlag, listFlag, tostdoutFlag, verboseFlag, argc, argv));
-#endif
- } else {
- exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag));
- }
-
- flagError:
- fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
-}
-
-static void
-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) {
- if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0)
- errorMsg(io_error, header->name, strerror(errno));
- /* 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);
- }
-
- /* 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;
- }
- 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;
- }
- }
-
- size -= actualWriteSz;
- }
-
- /* Now we are done writing the file out, so try
- * and fix up the permissions and whatnot */
- if (extractFlag==TRUE && tostdoutFlag==FALSE) {
- struct utimbuf t;
- /* Now set permissions etc for the new file */
- fchown(outFd, header->uid, header->gid);
- fchmod(outFd, header->mode & ~S_IFMT);
- close(outFd);
- /* File must be closed before trying to change the date */
- t.actime = time(0);
- t.modtime = header->mtime;
- utime(header->name, &t);
- }
-}
-
-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 void
-tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
-
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
-
- if (createPath(header->name, header->mode) != TRUE) {
- errorMsg("Error creating directory '%s': %s", header->name, strerror(errno));
- return;
- }
- /* 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);
- }
-}
-
+/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static void
-tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
+addHardLinkInfo (HardLinkInfo **hlInfoHeadPtr, dev_t dev, ino_t ino,
+ short linkCount, const char *name)
{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
-
- if (link(header->linkname, header->name) < 0) {
- errorMsg("Error creating hard link '%s': %s\n", header->linkname, strerror(errno));
- return;
+ /* 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);
}
-
- /* Now set permissions etc for the new directory */
- fixUpPermissions(header);
-}
-
-static void
-tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
-
-#ifdef S_ISLNK
- if (symlink(header->linkname, header->name) < 0) {
- errorMsg("Error creating symlink '%s': %s\n", header->linkname, strerror(errno));
- return;
- }
- /* 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
- fprintf(stderr, "Cannot create symbolic links\n");
-#endif
+ return;
}
static void
-tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
+freeHardLinkInfo (HardLinkInfo **hlInfoHeadPtr)
{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return;
-
- if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
- mknod(header->name, header->mode, makedev(header->devmajor, header->devminor));
- } else if (S_ISFIFO(header->mode)) {
- mkfifo(header->name, header->mode);
- } else {
- open(header->name, O_WRONLY | O_CREAT | O_TRUNC, header->mode);
+ HardLinkInfo *hlInfo = NULL;
+ HardLinkInfo *hlInfoNext = NULL;
+
+ if (hlInfoHeadPtr) {
+ hlInfo = *hlInfoHeadPtr;
+ while (hlInfo) {
+ hlInfoNext = hlInfo->next;
+ free(hlInfo);
+ hlInfo = hlInfoNext;
+ }
+ *hlInfoHeadPtr = NULL;
}
-
- /* Now set permissions etc for the new directory */
- fixUpPermissions(header);
-}
-
-/* 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;
+ return;
}
-
-/* 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;
- unsigned char *s = (unsigned char *)rawHeader;
-
- header->name = rawHeader->name;
- 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 */
- 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-- )
- sum += *s++;
- 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)
+/* 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)
{
- int status, tarFd=0;
- int errorFlag=FALSE;
- TarHeader rawHeader;
- TarInfo header;
- int alreadyWarned=FALSE;
- //int skipFileFlag=FALSE;
-
- /* 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 ) {
- close( tarFd);
- if ( *(header.name) == '\0' ) {
- goto endgame;
- } else {
- errorFlag=TRUE;
- errorMsg("Bad tar header, skipping\n");
- continue;
- }
- }
- 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;
- }
- }
-
- /* 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 %d/%-d ", modeString(header.mode), header.uid, header.gid);
- 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 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);
- printf("\n");
- }
-
-#if 0
- /* See if we want to restore this file or not */
- skipFileFlag=FALSE;
- if (wantFileName(outName) == FALSE) {
- skipFileFlag = TRUE;
- }
-#endif
-
- /* 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] != '/') {
- tarExtractRegularFile(&header, extractFlag, tostdoutFlag);
- break;
- }
- case DIRTYPE:
- tarExtractDirectory( &header, extractFlag, tostdoutFlag);
- break;
- case LNKTYPE:
- tarExtractHardLink( &header, extractFlag, tostdoutFlag);
- break;
- case SYMTYPE:
- tarExtractSymLink( &header, extractFlag, tostdoutFlag);
- break;
- case CHRTYPE:
- case BLKTYPE:
- case FIFOTYPE:
- tarExtractSpecial( &header, extractFlag, tostdoutFlag);
- 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);
+ while(hlInfo) {
+ if ((ino == hlInfo->ino) && (dev == hlInfo->dev))
+ break;
+ hlInfo = hlInfo->next;
}
- else
- return( status);
-
- /* Stuff to do when we are done */
-endgame:
- close( tarFd);
- if ( *(header.name) == '\0' ) {
- if (errorFlag==FALSE)
- return( TRUE);
- }
- return( FALSE);
+ return(hlInfo);
}
-
-#ifdef BB_FEATURE_TAR_CREATE
-
/* 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 *tempString;
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. */
- tempString = tempBuffer;
-
- sprintf (tempString, " %0*lo", len - 2, value);
-
- tempLength = strlen (tempString) + 1;
+ 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++;
return TRUE;
}
-/* Write out a tar header for the specified file */
+/* Write out a tar header for the specified file/directory/whatever */
static int
-writeTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
+writeTarHeader(struct TarBallInfo *tbInfo, const char *header_name,
+ const char *real_name, struct stat *statbuf)
{
- int i;
- long chksum, sum;
- unsigned char *s = (unsigned char *)rawHeader;
-
+ 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));
- strcpy(header.name, fileName);
- putOctal(header.mode, sizeof(header.mode), statbuf->st_mode & 0777);
+ 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), statbuf->st_size);
+ 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)) {
+ char *lpath = xreadlink(real_name);
+ if (!lpath) /* Already printed err msg inside xreadlink() */
+ return ( FALSE);
+ header.typeflag = SYMTYPE;
+ strncpy(header.linkname, lpath, sizeof(header.linkname));
+ free(lpath);
+ } 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);
+ }
- if (S_ISLNK(statbuf.st_mode)) {
- header.type = LNKTYPE;
- // Handle SYMTYPE
- } else if (S_ISDIR(statbuf.st_mode)) {
- header.type = DIRTYPE;
- } else if (S_ISCHR(statbuf.st_mode)) {
- header.type = CHRTYPE;
- } else if (S_ISBLK(statbuf.st_mode)) {
- header.type = BLKTYPE;
- } else if (S_ISFIFO(statbuf.st_mode)) {
- header.type = FIFOTYPE;
- } else if (S_ISSOCK(statbuf.st_mode)) {
- header.type = S_ISSOCK;
- } else if (S_ISLNK(statbuf.st_mode)) {
- header.type = LNKTYPE;
- } else if (S_ISLNK(statbuf.st_mode)) {
- header.type = REGTYPE;
- }
-#if 0
- header->linkname = rawHeader->linkname;
- header->devmajor = getOctal(rawHeader->devmajor, sizeof(rawHeader->devmajor));
- header->devminor = getOctal(rawHeader->devminor, sizeof(rawHeader->devminor));
-
- /* Write out the checksum */
- chksum = getOctal(rawHeader->chksum, sizeof(rawHeader->chksum));
-#endif
+ /* 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 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 fileAction(const char *fileName, struct stat *statbuf, void* userData)
+static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
{
- int *tarFd=(int*)userData;
- dprintf(*tarFd, "%s\n", fileName);
- return (TRUE);
+ 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 //BB_FEATURE_TAR_EXCLUDE
+
+ 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 extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, int argc, char **argv)
+static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
+ char** excludeList)
{
int tarFd=-1;
- //int errorFlag=FALSE;
- //TarHeader rawHeader;
- //TarInfo header;
- //int alreadyWarned=FALSE;
- //int skipFileFlag=FALSE;
- struct stat tarballStat;
- dev_t tarDev = 0;
- ino_t tarInode = 0;
+ 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 (argc <= 0)
- fatalError("tar: Cowardly refusing to create an empty archive\n");
+ if (*argv == NULL)
+ error_msg_and_die("Cowardly refusing to create an empty archive");
/* Open the tar file for writing. */
- if (tostdoutFlag == TRUE)
- tarFd = fileno(stdout);
+ if (!strcmp(tarName, "-"))
+ tbInfo.tarFd = fileno(stdout);
else
- tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
- if (tarFd < 0) {
- errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno));
+ 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);
}
- /* Store the device and inode of the tarball, so we can be sure
- * not to try and include it into itself.... */
- if (fstat(tarFd, &tarballStat) < 0)
- fatalError(io_error, tarName, strerror(errno));
- tarDev = tarballStat.st_dev;
- tarInode = tarballStat.st_ino;
-
- /* Set the umask for this process so it doesn't
- * screw up permission setting for us later. */
- umask(0);
+ 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));
/* Read the directory/files and iterate over them one at a time */
- while (argc-- > 0) {
- if (recursiveAction(*argv++, TRUE, FALSE, FALSE,
- fileAction, fileAction, (void*) &tarFd) == FALSE) {
- exit(FALSE);
+ 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 //tar_create
+
+void append_file_to_list(char *filename, char ***name_list, int *num_of_entries)
+{
+ FILE *src_stream;
+ char *line;
+ char *line_ptr;
+
+ src_stream = xfopen(filename, "r");
+ while ((line = get_line_from_file(src_stream)) != NULL) {
+ line_ptr = last_char_is(line, '\n');
+ if (line_ptr) {
+ *line_ptr = '\0';
+ }
+ *name_list = realloc(*name_list, sizeof(char *) * (*num_of_entries + 1));
+ (*name_list)[*num_of_entries] = xstrdup(line);
+ (*num_of_entries)++;
+ free(line);
+ }
+ fclose(src_stream);
+}
+
+#ifdef BB_FEATURE_TAR_EXCLUDE
+char **merge_list(char **include_list, char **exclude_list)
+{
+ char **new_include_list = NULL;
+ int new_include_count = 0;
+ int include_count = 0;
+ int exclude_count;
+
+ while (include_list[include_count] != NULL) {
+ int found = FALSE;
+ exclude_count = 0;
+ while (exclude_list[exclude_count] != NULL) {
+ if (strcmp(include_list[include_count], exclude_list[exclude_count]) == 0) {
+ found = TRUE;
+ break;
+ }
+ exclude_count++;
+ }
+
+ if (found == FALSE) {
+ new_include_list = realloc(new_include_list, sizeof(char *) * (include_count + 2));
+ new_include_list[new_include_count] = include_list[include_count];
+ new_include_count++;
+ new_include_list[new_include_count] = NULL;
+ } else {
+ free(include_list[include_count]);
+ }
+ include_count++;
+ }
+ return(new_include_list);
+}
+#endif
+
+int tar_main(int argc, char **argv)
+{
+ enum untar_funct_e {
+ /* These are optional */
+ untar_from_file = 1,
+ untar_from_stdin = 2,
+ untar_unzip = 4,
+ /* Require one and only one of these */
+ untar_list = 8,
+ untar_create = 16,
+ untar_extract = 32
+ };
+
+#ifdef BB_FEATURE_TAR_EXCLUDE
+ char **exclude_list = NULL;
+ int exclude_count = 0;
+#endif
+ FILE *src_stream = NULL;
+ FILE *uncompressed_stream = NULL;
+ char **include_list = NULL;
+ char *src_filename = NULL;
+ char *dst_prefix = NULL;
+ char *file_list_name = NULL;
+ int opt;
+ unsigned short untar_funct = 0;
+ unsigned short untar_funct_required = 0;
+ unsigned short extract_function = 0;
+ int include_count = 0;
+ int gunzip_pid;
+ int gz_fd = 0;
+
+ if (argc < 2) {
+ show_usage();
+ }
+
+ /* Prepend '-' to the first argument if required */
+ if (argv[1][0] != '-') {
+ char *tmp = xmalloc(strlen(argv[1]) + 2);
+ tmp[0] = '-';
+ strcpy(tmp + 1, argv[1]);
+ argv[1] = tmp;
+ }
+
+ while ((opt = getopt(argc, argv, "ctxT:X:C:f:Opvz")) != -1) {
+ switch (opt) {
+
+ /* One and only one of these is required */
+ case 'c':
+ untar_funct_required |= untar_create;
+ break;
+ case 't':
+ untar_funct_required |= untar_list;
+ extract_function |= extract_list |extract_unconditional;
+ break;
+ case 'x':
+ untar_funct_required |= untar_extract;
+ extract_function |= (extract_all_to_fs | extract_unconditional | extract_create_leading_dirs);
+ break;
+ /* These are optional */
+ /* Exclude or Include files listed in <filename>*/
+#ifdef BB_FEATURE_TAR_EXCLUDE
+ case 'X':
+ append_file_to_list(optarg, &exclude_list, &exclude_count);
+ exclude_list[exclude_count] = NULL;
+ break;
#endif
+ case 'T':
+ // by default a list is an include list
+ append_file_to_list(optarg, &include_list, &include_count);
+ break;
+ case 'C': // Change to dir <optarg>
+ /* Make sure dst_prefix ends in a '/' */
+ dst_prefix = concat_path_file(optarg, "/");
+ break;
+ case 'f': // archive filename
+ if (strcmp(optarg, "-") == 0) {
+ // Untar from stdin to stdout
+ untar_funct |= untar_from_stdin;
+ } else {
+ untar_funct |= untar_from_file;
+ src_filename = xstrdup(optarg);
+ }
+ break;
+ case 'O':
+ extract_function |= extract_to_stdout;
+ break;
+ case 'p':
+ break;
+ case 'v':
+ if (extract_function & extract_list) {
+ extract_function |= extract_verbose_list;
+ }
+ extract_function |= extract_list;
+ break;
+#ifdef BB_FEATURE_TAR_GZIP
+ case 'z':
+ untar_funct |= untar_unzip;
+ break;
+#endif
+ default:
+ show_usage();
+ }
+ }
+
+ /* Make sure the valid arguments were passed */
+ if (untar_funct_required == 0) {
+ error_msg_and_die("You must specify one of the `-ctx' options");
+ }
+ if ((untar_funct_required != untar_create) &&
+ (untar_funct_required != untar_extract) &&
+ (untar_funct_required != untar_list)) {
+ error_msg_and_die("You may not specify more than one `ctx' option.");
+ }
+ untar_funct |= untar_funct_required;
+
+ /* Setup an array of filenames to work with */
+ while (optind < argc) {
+ include_list = realloc(include_list, sizeof(char *) * (include_count + 2));
+ include_list[include_count] = xstrdup(argv[optind]);
+ include_count++;
+ optind++;
+ include_list[include_count] = NULL;
+ }
+
+#ifdef BB_FEATURE_TAR_EXCLUDE
+ /* Remove excluded files from the include list */
+ if (exclude_list != NULL) {
+ /* If both an exclude and include file list was present then
+ * its an exclude from include list only, if not its really an
+ * exclude list (and a poor choice of variable names) */
+ if (include_list == NULL) {
+ extract_function |= extract_exclude_list;
+ }
+ include_list = merge_list(include_list, exclude_list);
+ }
+#endif
+
+ if (extract_function & (extract_list | extract_all_to_fs)) {
+ if (dst_prefix == NULL) {
+ dst_prefix = xstrdup("./");
+ }
+
+ /* Setup the source of the tar data */
+ if (untar_funct & untar_from_file) {
+ src_stream = xfopen(src_filename, "r");
+ } else {
+ src_stream = stdin;
+ }
+#ifdef BB_FEATURE_TAR_GZIP
+ /* Get a binary tree of all the tar file headers */
+ if (untar_funct & untar_unzip) {
+ uncompressed_stream = gz_open(src_stream, &gunzip_pid);
+ } else
+#endif // BB_FEATURE_TAR_GZIP
+ uncompressed_stream = src_stream;
+
+ /* extract or list archive */
+ unarchive(uncompressed_stream, stdout, &get_header_tar, extract_function, dst_prefix, include_list);
+ fclose(uncompressed_stream);
+ }
+#ifdef BB_FEATURE_TAR_CREATE
+ /* create an archive */
+ else if (untar_funct & untar_create) {
+ int verboseFlag = FALSE;
+
+#ifdef BB_FEATURE_TAR_GZIP
+ if (untar_funct && untar_unzip) {
+ error_msg_and_die("Creation of compressed tarfile not internally support by tar, pipe to busybox gunzip");
+ }
+#endif // BB_FEATURE_TAR_GZIP
+ if (extract_function & extract_verbose_list) {
+ verboseFlag = TRUE;
+ }
+ writeTarFile(src_filename, verboseFlag, &argv[argc - 1], include_list);
+ }
+#endif // BB_FEATURE_TAR_CREATE
+
+ /* Cleanups */
+#ifdef BB_FEATURE_TAR_GZIP
+ if (untar_funct & untar_unzip) {
+ fclose(src_stream);
+ close(gz_fd);
+ gz_close(gunzip_pid);
+ }
+#endif // BB_FEATURE_TAR_GZIP
+ if (src_filename) {
+ free(src_filename);
+ }
+ if (file_list_name) {
+ free(file_list_name);
+ }
+ return(EXIT_SUCCESS);
+}
projects / oweals / busybox.git / blobdiff