+/* vi: set sw=4 ts=4: */
/*
- * Mini tar implementation for busybox based on code taken from sash.
+ * Mini tar implementation for busybox
*
- * 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 this code under the GPL has been granted.
- *
- * Modified for busybox by Erik Andersen <andersee@debian.org>
- * Adjusted to grok stdin/stdout options.
- *
- * Modified to handle device special files by Matt Porter
- * <porter@debian.org>
+ * Copyright (C) 1999 by Lineo, inc.
+ * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
*
* 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
#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 <utime.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
+#include <sys/param.h> /* for PATH_MAX */
#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";
+ "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 -[cxtvOf] [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 -[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";
-/*
- * Tar file constants.
- */
-#define TAR_BLOCK_SIZE 512
-#define TAR_NAME_SIZE 100
+#endif
-/*
- * The POSIX (and basic GNU) tar header format.
- * This structure is always embedded in a TAR_BLOCK_SIZE sized block
- * with zero padding. We only process this information minimally.
- */
-typedef struct {
- char name[TAR_NAME_SIZE];
- char mode[8];
- char uid[8];
- char gid[8];
- char size[12];
- char mtime[12];
- char checkSum[8];
- char typeFlag;
- char linkName[TAR_NAME_SIZE];
- char magic[6];
- char version[2];
- char uname[32];
- char gname[32];
- char devMajor[8];
- char devMinor[8];
- char prefix[155];
-} TarHeader;
-
-#define TAR_MAGIC "ustar"
-#define TAR_VERSION "00"
-
-#define TAR_TYPE_REGULAR '0'
-#define TAR_TYPE_HARD_LINK '1'
-#define TAR_TYPE_SOFT_LINK '2'
+/* Tar file constants */
+#ifndef MAJOR
+#define MAJOR(dev) (((dev)>>8)&0xff)
+#define MINOR(dev) ((dev)&0xff)
+#endif
-/*
- * Static data.
- */
-static int listFlag;
-static int extractFlag;
-#ifdef BB_FEATURE_TAR_CREATE
-static int createFlag;
-#endif
-static int verboseFlag;
-static int tostdoutFlag;
-
-static int inHeader; // <- check me
-static int badHeader;
-static int errorFlag;
-static int skipFileFlag;
-static int warnedRoot;
-static int eofFlag;
-static long dataCc;
-static int outFd;
-static const char *outName;
-
-static int mode;
-static int uid;
-static int gid;
-static time_t mtime;
+/* POSIX tar Header Block, from POSIX 1003.1-1990 */
+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 */
+};
+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_MAGIC_LEN 6
+#define TAR_VERSION_LEN 2
+#define TAR_NAME_LEN 100
+#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;
-/*
- * Static data associated with the tar file.
- */
-static const char *tarName;
-static int tarFd;
-static dev_t tarDev;
-static ino_t tarInode;
+/* Static data */
+static const unsigned long TarChecksumOffset = (const unsigned long)&(((TarHeader *)0)->chksum);
-/*
- * Local procedures to restore files from a tar file.
- */
-static void readTarFile (int fileCount, char **fileTable);
-static void readData (const char *cp, int count);
-static long getOctal (const char *cp, int len);
+/* Local procedures to restore files from a tar file. */
+static int readTarFile(const char* tarName, int extractFlag, int listFlag,
+ int tostdoutFlag, int verboseFlag);
-static void readHeader (const TarHeader * hp,
- int fileCount, char **fileTable);
-static int wantFileName (const char *fileName,
- int fileCount, char **fileTable);
#ifdef BB_FEATURE_TAR_CREATE
/*
* Local procedures to save files into a tar file.
*/
-static void saveFile (const char *fileName, int seeLinks);
-
-static void saveRegularFile (const char *fileName,
- const struct stat *statbuf);
-
-static void saveDirectory (const char *fileName,
- const struct stat *statbuf);
-
-static void writeHeader (const char *fileName, const struct stat *statbuf);
-
-static void writeTarFile (int fileCount, char **fileTable);
-static void writeTarBlock (const char *buf, int len);
-static int putOctal (char *cp, int len, long value);
+static void saveFile(const char *fileName, int seeLinks);
+static void saveRegularFile(const char *fileName,
+ const struct stat *statbuf);
+static void saveDirectory(const char *fileName,
+ const struct stat *statbuf);
+static void writeHeader(const char *fileName, const struct stat *statbuf);
+static void writeTarFile(int argc, char **argv);
+static void writeTarBlock(const char *buf, int len);
+static int putOctal(char *cp, int len, long value);
#endif
-extern int tar_main (int argc, char **argv)
+extern int tar_main(int argc, char **argv)
{
- const char *options;
-
- argc--;
- argv++;
+ const char *tarName=NULL;
+ const char *options;
+ int listFlag = FALSE;
+ int extractFlag = FALSE;
+ int createFlag = FALSE;
+ int verboseFlag = FALSE;
+ int tostdoutFlag = FALSE;
- if (argc < 1)
- usage( tar_usage);
+ argc--;
+ argv++;
+ if (argc < 1)
+ usage(tar_usage);
- errorFlag = FALSE;
- extractFlag = FALSE;
-#ifdef BB_FEATURE_TAR_CREATE
- createFlag = FALSE;
-#endif
- listFlag = FALSE;
- verboseFlag = FALSE;
- tostdoutFlag = FALSE;
- tarName = NULL;
- tarDev = 0;
- tarInode = 0;
- tarFd = -1;
-
- /*
- * Parse the options.
- */
- if (**argv == '-') {
- options = (*argv++) + 1;
+ /* Parse options */
+ if (**argv == '-')
+ options = (*argv++) + 1;
+ else
+ options = (*argv++);
argc--;
- for (; *options; options++) {
- switch (*options) {
- case 'f':
- if (tarName != NULL) {
- fprintf (stderr, "Only one 'f' option allowed\n");
- exit (FALSE);
+ 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;
+ break;
+
+ case '-':
+ usage(tar_usage);
+ break;
+
+ default:
+ fatalError( "Unknown tar flag '%c'\n"
+ "Try `tar --help' for more information\n", *options);
}
+ }
- tarName = *argv++;
- argc--;
-
- break;
-
- case 't':
- listFlag = TRUE;
- break;
-
- case 'x':
- extractFlag = TRUE;
- break;
-#ifdef BB_FEATURE_TAR_CREATE
- case 'c':
- createFlag = TRUE;
- break;
+ /*
+ * 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
- case 'c':
- fprintf (stderr, "This version of tar was not compiled with tar creation support.\n" );
-
- exit (FALSE);
+ exit(writeTarFile(argc, argv));
#endif
-
- case 'v':
- verboseFlag = TRUE;
- break;
-
- case 'O':
- tostdoutFlag = TRUE;
- break;
-
- case '-':
- usage( tar_usage);
- break;
-
- default:
- fprintf (stderr, "Unknown tar flag '%c'\n"
- "Try `tar --help' for more information\n",
- *options);
-
- exit (FALSE);
- }
+ } else {
+ exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag));
}
- }
- /*
- * Validate the options.
- */
- if (extractFlag + listFlag
-#ifdef BB_FEATURE_TAR_CREATE
- + createFlag
-#endif
- != (TRUE+FALSE+FALSE)) {
- fprintf (stderr,
- "Exactly one of 'c', 'x' or 't' must be specified\n");
-
- exit (FALSE);
- }
-
- /*
- * Do the correct type of action supplying the rest of the
- * command line arguments as the list of files to process.
- */
-#ifdef BB_FEATURE_TAR_CREATE
- if (createFlag==TRUE)
- writeTarFile (argc, argv);
- else
-#endif
- readTarFile (argc, argv);
- if (errorFlag==TRUE)
- fprintf (stderr, "\n");
- exit (!errorFlag);
+ flagError:
+ fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n");
}
-
-
-/*
- * 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 void readTarFile (int fileCount, char **fileTable)
+
+static void
+tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
{
- const char *cp;
- int cc;
- int inCc;
- int blockSize;
- char buf[BUF_SIZE];
-
- skipFileFlag = FALSE;
- badHeader = FALSE;
- warnedRoot = FALSE;
- eofFlag = FALSE;
- inHeader = TRUE;
- inCc = 0;
- dataCc = 0;
- outFd = -1;
- blockSize = sizeof (buf);
- cp = buf;
-
- /*
- * Open the tar file for reading.
- */
- if ((tarName == NULL) || !strcmp (tarName, "-")) {
- tarFd = fileno(stdin);
- } else
- tarFd = open (tarName, O_RDONLY);
-
- if (tarFd < 0) {
- perror (tarName);
- errorFlag = TRUE;
- return;
- }
-
- /*
- * Read blocks from the file until an end of file header block
- * has been seen. (A real end of file from a read is an error.)
- */
- while (eofFlag==FALSE) {
- /*
- * Read the next block of data if necessary.
- * This will be a large block if possible, which we will
- * then process in the small tar blocks.
- */
- if (inCc <= 0) {
- cp = buf;
- inCc = fullRead (tarFd, buf, blockSize);
-
- if (inCc < 0) {
- perror (tarName);
- errorFlag = TRUE;
- goto done;
- }
-
- if (inCc == 0) {
- fprintf (stderr,
- "Unexpected end of file from \"%s\"", tarName);
- errorFlag = TRUE;
- goto done;
- }
+ 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);
}
- /*
- * If we are expecting a header block then examine it.
- */
- if (inHeader==TRUE) {
- readHeader ((const TarHeader *) cp, fileCount, fileTable);
+ /* 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("Error reading tarfile: %s", strerror(errno));
+ return;
+ }
+ if ( readSize < writeSize )
+ writeSize = readSize;
+
+ /* Write out the file, if we are supposed to be doing that */
+ if (extractFlag==TRUE) {
- cp += TAR_BLOCK_SIZE;
- inCc -= TAR_BLOCK_SIZE;
+ if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) {
+ /* Output file seems to have a problem */
+ errorMsg(io_error, header->name, strerror(errno));
+ return;
+ }
+ }
- continue;
+ size -= actualWriteSz;
}
- /*
- * We are currently handling the data for a file.
- * Process the minimum of the amount of data we have available
- * and the amount left to be processed for the file.
- */
- cc = inCc;
+ /* 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);
+ }
+}
- if (cc > dataCc)
- cc = dataCc;
+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)
+{
- readData (cp, cc);
+ if (extractFlag==FALSE || tostdoutFlag==TRUE)
+ return;
- /*
- * If the amount left isn't an exact multiple of the tar block
- * size then round it up to the next block boundary since there
- * is padding at the end of the file.
- */
- if (cc % TAR_BLOCK_SIZE)
- cc += TAR_BLOCK_SIZE - (cc % TAR_BLOCK_SIZE);
-
- cp += cc;
- inCc -= cc;
- }
-
- done:
- /*
- * Close the tar file if needed.
- */
- if ((tarFd >= 0) && (close (tarFd) < 0))
- perror (tarName);
-
- /*
- * Close the output file if needed.
- * This is only done here on a previous error and so no
- * message is required on errors.
- */
- if (tostdoutFlag == FALSE) {
- if (outFd >= 0) {
- close (outFd);
+ 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 '/') */
+ mkdir(header->name, header->mode);
+ /* Now set permissions etc for the new directory */
+ fixUpPermissions(header);
+}
-/*
- * Examine the header block that was just read.
- * This can specify the information for another file, or it can mark
- * the end of the tar file.
- */
static void
-readHeader (const TarHeader * hp, int fileCount, char **fileTable)
+tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
{
- int checkSum;
- int cc;
- int hardLink;
- int softLink;
- int devFileFlag;
- unsigned int major;
- unsigned int minor;
- long size;
- struct utimbuf utb;
-
- /*
- * If the block is completely empty, then this is the end of the
- * archive file. If the name is null, then just skip this header.
- */
- outName = hp->name;
-
- if (*outName == '\0') {
- for (cc = TAR_BLOCK_SIZE; cc > 0; cc--) {
- if (*outName++)
+ if (extractFlag==FALSE || tostdoutFlag==TRUE)
return;
- }
- eofFlag = TRUE;
-
- return;
- }
-
- /*
- * There is another file in the archive to examine.
- * Extract the encoded information and check it.
- */
- mode = getOctal (hp->mode, sizeof (hp->mode));
- uid = getOctal (hp->uid, sizeof (hp->uid));
- gid = getOctal (hp->gid, sizeof (hp->gid));
- size = getOctal (hp->size, sizeof (hp->size));
- mtime = getOctal (hp->mtime, sizeof (hp->mtime));
- checkSum = getOctal (hp->checkSum, sizeof (hp->checkSum));
- major = getOctal (hp->devMajor, sizeof (hp->devMajor));
- minor = getOctal (hp->devMinor, sizeof (hp->devMinor));
-
- if ((mode < 0) || (uid < 0) || (gid < 0) || (size < 0)) {
- if (badHeader==FALSE)
- fprintf (stderr, "Bad tar header, skipping\n");
-
- badHeader = TRUE;
-
- return;
- }
-
- badHeader = FALSE;
- skipFileFlag = FALSE;
- devFileFlag = FALSE;
-
- /*
- * Check for the file modes.
- */
- hardLink = ((hp->typeFlag == TAR_TYPE_HARD_LINK) ||
- (hp->typeFlag == TAR_TYPE_HARD_LINK - '0'));
-
- softLink = ((hp->typeFlag == TAR_TYPE_SOFT_LINK) ||
- (hp->typeFlag == TAR_TYPE_SOFT_LINK - '0'));
-
- /*
- * Check for a directory.
- */
- if (outName[strlen (outName) - 1] == '/')
- mode |= S_IFDIR;
-
- /*
- * Check for absolute paths in the file.
- * If we find any, then warn the user and make them relative.
- */
- if (*outName == '/') {
- while (*outName == '/')
- outName++;
-
- if (warnedRoot==FALSE) {
- fprintf (stderr,
- "Absolute path detected, removing leading slashes\n");
+ if (link(header->linkname, header->name) < 0) {
+ errorMsg("Error creating hard link '%s': %s", header->linkname, strerror(errno));
+ return;
}
- warnedRoot = TRUE;
- }
-
- /*
- * See if we want this file to be restored.
- * If not, then set up to skip it.
- */
- if (wantFileName (outName, fileCount, fileTable) == FALSE) {
- if ( !hardLink && !softLink && (S_ISREG (mode) || S_ISCHR (mode)
- || S_ISBLK (mode) || S_ISSOCK(mode) || S_ISFIFO(mode) ) ) {
- inHeader = (size == 0)? TRUE : FALSE;
- dataCc = size;
- }
+ /* Now set permissions etc for the new directory */
+ fixUpPermissions(header);
+}
- skipFileFlag = TRUE;
-
- return;
- }
-
- /*
- * This file is to be handled.
- * If we aren't extracting then just list information about the file.
- */
- if (extractFlag==FALSE) {
- if (verboseFlag==TRUE) {
- printf ("%s %3d/%-d ", modeString (mode), uid, gid);
- if( S_ISCHR (mode) || S_ISBLK (mode) )
- printf ("%4d,%4d %s ", major,minor, timeString (mtime));
- else
- printf ("%9ld %s ", size, timeString (mtime));
- }
- printf ("%s", outName);
-
- if (hardLink)
- printf (" (link to \"%s\")", hp->linkName);
- else if (softLink)
- printf (" (symlink to \"%s\")", hp->linkName);
- else if (S_ISREG (mode) || S_ISCHR (mode) || S_ISBLK (mode) ||
- S_ISSOCK(mode) || S_ISFIFO(mode) ) {
- inHeader = (size == 0)? TRUE : FALSE;
- dataCc = size;
- }
+static void
+tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
+{
+ if (extractFlag==FALSE || tostdoutFlag==TRUE)
+ return;
- printf ("\n");
-
- return;
- }
-
- /*
- * We really want to extract the file.
- */
- if (verboseFlag==TRUE)
- printf ("x %s\n", outName);
-
- if (hardLink) {
- if (link (hp->linkName, outName) < 0)
- perror (outName);
- /* Set the file time */
- utb.actime = mtime;
- utb.modtime = mtime;
- utime (outName, &utb);
- /* Set the file permissions */
- chown(outName, uid, gid);
- chmod(outName, mode);
- return;
- }
-
- if (softLink) {
#ifdef S_ISLNK
- if (symlink (hp->linkName, outName) < 0)
- perror (outName);
+ if (symlink(header->linkname, header->name) < 0) {
+ errorMsg("Error creating symlink '%s': %s", 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).
+ * Changing the pointed-to-file is the Wrong Thing(tm).
*/
#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
- lchown(outName, uid, gid);
+ 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");
+ fprintf(stderr, "Cannot create symbolic links\n");
#endif
- return;
- }
-
- /* Set the umask for this process so it doesn't
- * screw things up. */
- umask(0);
-
- /*
- * If the file is a directory, then just create the path.
- */
- if (S_ISDIR (mode)) {
- createPath (outName, mode);
- /* Set the file time */
- utb.actime = mtime;
- utb.modtime = mtime;
- utime (outName, &utb);
- /* Set the file permissions */
- chown(outName, uid, gid);
- chmod(outName, mode);
- return;
- }
-
- /*
- * There is a file to write.
- * First create the path to it if necessary with default permissions.
- */
- createPath (outName, 0777);
-
- inHeader = (size == 0)? TRUE : FALSE;
- dataCc = size;
-
- /*
- * Start the output file.
- */
- if (tostdoutFlag == TRUE)
- outFd = fileno(stdout);
- else {
- if ( S_ISCHR(mode) || S_ISBLK(mode) || S_ISSOCK(mode) ) {
- devFileFlag = TRUE;
- outFd = mknod (outName, mode, makedev(major, minor) );
- }
- else if (S_ISFIFO(mode) ) {
- devFileFlag = TRUE;
- outFd = mkfifo(outName, mode);
- } else {
- outFd = open (outName, O_WRONLY | O_CREAT | O_TRUNC, mode);
- }
- if (outFd < 0) {
- perror (outName);
- skipFileFlag = TRUE;
- return;
- }
- /* Set the file time */
- utb.actime = mtime;
- utb.modtime = mtime;
- utime (outName, &utb);
- /* Set the file permissions */
- chown(outName, uid, gid);
- chmod(outName, mode);
- }
-
-
- /*
- * If the file is empty, then that's all we need to do.
- */
- if (size == 0 && (tostdoutFlag == FALSE) && (devFileFlag == FALSE)) {
- close (outFd);
- outFd = -1;
- }
}
-
-/*
- * Handle a data block of some specified size that was read.
- */
-static void readData (const char *cp, int count)
-{
- /*
- * Reduce the amount of data left in this file.
- * If there is no more data left, then we need to read
- * the header again.
- */
- dataCc -= count;
-
- if (dataCc <= 0)
- inHeader = TRUE;
-
- /*
- * If we aren't extracting files or this file is being
- * skipped then do nothing more.
- */
- if (extractFlag==FALSE || skipFileFlag==TRUE)
- return;
-
- /*
- * Write the data to the output file.
- */
- if (fullWrite (outFd, cp, count) < 0) {
- perror (outName);
- if (tostdoutFlag == FALSE) {
- close (outFd);
- outFd = -1;
- }
- skipFileFlag = TRUE;
- return;
- }
-
- /*
- * Check if we are done writing to the file now.
- */
- if (dataCc <= 0 && tostdoutFlag == FALSE) {
- struct utimbuf utb;
- if (close (outFd))
- perror (outName);
-
- /* Set the file time */
- utb.actime = mtime;
- utb.modtime = mtime;
- utime (outName, &utb);
- /* Set the file permissions */
- chown(outName, uid, gid);
- chmod(outName, mode);
-
- outFd = -1;
- }
-}
-
-
-/*
- * See if the specified file name belongs to one of the specified list
- * of path prefixes. An empty list implies that all files are wanted.
- * Returns TRUE if the file is selected.
- */
-static int
-wantFileName (const char *fileName, int fileCount, char **fileTable)
+static void
+tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
{
- const char *pathName;
- int fileLength;
- int pathLength;
-
- /*
- * If there are no files in the list, then the file is wanted.
- */
- if (fileCount == 0)
- return TRUE;
-
- fileLength = strlen (fileName);
-
- /*
- * Check each of the test paths.
- */
- while (fileCount-- > 0) {
- pathName = *fileTable++;
-
- pathLength = strlen (pathName);
-
- if (fileLength < pathLength)
- continue;
-
- if (memcmp (fileName, pathName, pathLength) != 0)
- continue;
+ if (extractFlag==FALSE || tostdoutFlag==TRUE)
+ return;
- if ((fileLength == pathLength) || (fileName[pathLength] == '/')) {
- return TRUE;
+ 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);
}
- }
- return FALSE;
+ /* Now set permissions etc for the new directory */
+ fixUpPermissions(header);
}
-/*
- * Read an octal value in a field of the specified width, with optional
+/* 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 len)
-{
- long val;
-
- while ((len > 0) && (*cp == ' ')) {
- cp++;
- len--;
- }
-
- if ((len == 0) || !isOctal (*cp))
- return -1;
-
- val = 0;
-
- while ((len > 0) && isOctal (*cp)) {
- val = val * 8 + *cp++ - '0';
- len--;
- }
-
- while ((len > 0) && (*cp == ' ')) {
- cp++;
- len--;
- }
-
- if ((len > 0) && *cp)
- return -1;
-
- return val;
-}
-
-
-
-
-/* From here to the end of the file is the tar writing stuff.
- * If you do not have BB_FEATURE_TAR_CREATE defined, this will
- * not be built.
- * */
-#ifdef BB_FEATURE_TAR_CREATE
-
-/*
- * Write a tar file containing the specified files.
- */
-static void writeTarFile (int fileCount, char **fileTable)
-{
- struct stat statbuf;
-
- /*
- * Make sure there is at least one file specified.
- */
- if (fileCount <= 0) {
- fprintf (stderr, "No files specified to be saved\n");
- errorFlag = TRUE;
- }
-
- /*
- * Create the tar file for writing.
- */
- if ((tarName == NULL) || !strcmp (tarName, "-")) {
- tostdoutFlag = TRUE;
- tarFd = fileno(stdout);
- } else
- tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0666);
-
- if (tarFd < 0) {
- perror (tarName);
- errorFlag = TRUE;
- return;
- }
-
- /*
- * Get the device and inode of the tar file for checking later.
- */
- if (fstat (tarFd, &statbuf) < 0) {
- perror (tarName);
- errorFlag = TRUE;
- goto done;
- }
-
- tarDev = statbuf.st_dev;
- tarInode = statbuf.st_ino;
-
- /*
- * Append each file name into the archive file.
- * Follow symbolic links for these top level file names.
- */
- while (errorFlag==FALSE && (fileCount-- > 0)) {
- saveFile (*fileTable++, FALSE);
- }
-
- /*
- * Now write an empty block of zeroes to end the archive.
- */
- writeTarBlock ("", 1);
-
-
- done:
- /*
- * Close the tar file and check for errors if it was opened.
- */
- if ((tostdoutFlag == FALSE) && (tarFd >= 0) && (close (tarFd) < 0))
- perror (tarName);
-}
-
-/*
- * Save one file into the tar file.
- * If the file is a directory, then this will recursively save all of
- * the files and directories within the directory. The seeLinks
- * flag indicates whether or not we want to see symbolic links as
- * they really are, instead of blindly following them.
- */
-static void saveFile (const char *fileName, int seeLinks)
+ * at the end. Returns -1 on an illegal format. */
+static long getOctal(const char *cp, int size)
{
- int status;
- struct stat statbuf;
+ long val = 0;
- if (verboseFlag==TRUE)
- printf ("a %s\n", fileName);
-
- /*
- * Check that the file name will fit in the header.
- */
- if (strlen (fileName) >= TAR_NAME_SIZE) {
- fprintf (stderr, "%s: File name is too long\n", fileName);
-
- return;
- }
-
- /*
- * Find out about the file.
- */
-#ifdef S_ISLNK
- if (seeLinks==TRUE)
- status = lstat (fileName, &statbuf);
- else
-#endif
- status = stat (fileName, &statbuf);
-
- if (status < 0) {
- perror (fileName);
-
- return;
- }
-
- /*
- * Make sure we aren't trying to save our file into itself.
- */
- if ((statbuf.st_dev == tarDev) && (statbuf.st_ino == tarInode)) {
- fprintf (stderr, "Skipping saving of archive file itself\n");
-
- return;
- }
-
- /*
- * Check the type of file.
- */
- mode = statbuf.st_mode;
-
- if (S_ISDIR (mode)) {
- saveDirectory (fileName, &statbuf);
-
- return;
- }
- if (S_ISREG (mode)) {
- saveRegularFile (fileName, &statbuf);
-
- return;
- }
-
- /* Some day add support for tarring these up... but not today. :) */
-// if (S_ISLNK(mode) || S_ISFIFO(mode) || S_ISBLK(mode) || S_ISCHR (mode) ) {
-// fprintf (stderr, "%s: This version of tar can't store this type of file\n", fileName);
-// }
-
- /*
- * The file is a strange type of file, ignore it.
- */
- fprintf (stderr, "%s: not a directory or regular file\n", fileName);
+ 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;
}
-/*
- * Save a regular file to the tar file.
- */
-static void
-saveRegularFile (const char *fileName, const struct stat *statbuf)
+/* Parse the tar header and fill in the nice struct with the details */
+static int
+parseTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
{
- int sawEof;
- int fileFd;
- int cc;
- int dataCount;
- long fullDataCount;
- char data[TAR_BLOCK_SIZE * 16];
-
- /*
- * Open the file for reading.
- */
- fileFd = open (fileName, O_RDONLY);
-
- if (fileFd < 0) {
- perror (fileName);
-
- return;
- }
-
- /*
- * Write out the header for the file.
- */
- writeHeader (fileName, statbuf);
-
- /*
- * Write the data blocks of the file.
- * We must be careful to write the amount of data that the stat
- * buffer indicated, even if the file has changed size. Otherwise
- * the tar file will be incorrect.
- */
- fullDataCount = statbuf->st_size;
- sawEof = FALSE;
-
- while (fullDataCount > 0) {
- /*
- * Get the amount to write this iteration which is
- * the minumum of the amount left to write and the
- * buffer size.
- */
- dataCount = sizeof (data);
-
- if (dataCount > fullDataCount)
- dataCount = (int) fullDataCount;
-
- /*
- * Read the data from the file if we haven't seen the
- * end of file yet.
- */
- cc = 0;
-
- if (sawEof==FALSE) {
- cc = fullRead (fileFd, data, dataCount);
-
- if (cc < 0) {
- perror (fileName);
-
- (void) close (fileFd);
- errorFlag = TRUE;
-
- return;
- }
-
- /*
- * If the file ended too soon, complain and set
- * a flag so we will zero fill the rest of it.
- */
- if (cc < dataCount) {
- fprintf (stderr,
- "%s: Short read - zero filling", fileName);
-
- sawEof = TRUE;
- }
- }
-
- /*
- * Zero fill the rest of the data if necessary.
- */
- if (cc < dataCount)
- memset (data + cc, 0, dataCount - cc);
-
- /*
- * Write the buffer to the TAR file.
- */
- writeTarBlock (data, dataCount);
-
- fullDataCount -= dataCount;
- }
-
- /*
- * Close the file.
- */
- if ((tostdoutFlag == FALSE) && close (fileFd) < 0)
- fprintf (stderr, "%s: close: %s\n", fileName, strerror (errno));
+ 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);
}
/*
- * Save a directory and all of its files to the tar file.
+ * 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 void saveDirectory (const char *dirName, const struct stat *statbuf)
+static int readTarFile(const char* tarName, int extractFlag, int listFlag,
+ int tostdoutFlag, int verboseFlag)
{
- DIR *dir;
- struct dirent *entry;
- int needSlash;
- char fullName[NAME_MAX];
-
- /*
- * Construct the directory name as used in the tar file by appending
- * a slash character to it.
- */
- strcpy (fullName, dirName);
- strcat (fullName, "/");
-
- /*
- * Write out the header for the directory entry.
- */
- writeHeader (fullName, statbuf);
-
- /*
- * Open the directory.
- */
- dir = opendir (dirName);
-
- if (dir == NULL) {
- fprintf (stderr, "Cannot read directory \"%s\": %s\n",
- dirName, strerror (errno));
-
- return;
- }
-
- /*
- * See if a slash is needed.
- */
- needSlash = (*dirName && (dirName[strlen (dirName) - 1] != '/'));
-
- /*
- * Read all of the directory entries and check them,
- * except for the current and parent directory entries.
- */
- while (errorFlag==FALSE && ((entry = readdir (dir)) != NULL)) {
- if ((strcmp (entry->d_name, ".") == 0) ||
- (strcmp (entry->d_name, "..") == 0)) {
- continue;
+ 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", tarName, strerror(errno));
+ return ( FALSE);
}
- /*
- * Build the full path name to the file.
- */
- strcpy (fullName, dirName);
-
- if (needSlash)
- strcat (fullName, "/");
-
- strcat (fullName, entry->d_name);
-
- /*
- * Write this file to the tar file, noticing whether or not
- * the file is a symbolic link.
- */
- saveFile (fullName, TRUE);
- }
+ /* 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 ( parseTarHeader(&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;
- /*
- * All done, close the directory.
- */
- closedir (dir);
-}
+ /* Check for and relativify any absolute paths */
+ if ( *(header.name) == '/' ) {
+ while (*(header.name) == '/')
+ ++*(header.name);
-/*
- * Write a tar header for the specified file name and status.
- * It is assumed that the file name fits.
- */
-static void writeHeader (const char *fileName, const struct stat *statbuf)
-{
- long checkSum;
- const unsigned char *cp;
- int len;
- TarHeader header;
-
- /*
- * Zero the header block in preparation for filling it in.
- */
- memset ((char *) &header, 0, sizeof (header));
-
- /*
- * Fill in the header.
- */
- strcpy (header.name, fileName);
-
- strncpy (header.magic, TAR_MAGIC, sizeof (header.magic));
- strncpy (header.version, TAR_VERSION, sizeof (header.version));
-
- putOctal (header.mode, sizeof (header.mode), statbuf->st_mode & 0777);
- 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.mtime, sizeof (header.mtime), statbuf->st_mtime);
-
- header.typeFlag = TAR_TYPE_REGULAR;
-
- /*
- * Calculate and store the checksum.
- * This is the sum of all of the bytes of the header,
- * with the checksum field itself treated as blanks.
- */
- memset (header.checkSum, ' ', sizeof (header.checkSum));
-
- cp = (const unsigned char *) &header;
- len = sizeof (header);
- checkSum = 0;
-
- while (len-- > 0)
- checkSum += *cp++;
-
- putOctal (header.checkSum, sizeof (header.checkSum), checkSum);
-
- /*
- * Write the tar header.
- */
- writeTarBlock ((const char *) &header, sizeof (header));
-}
-
+ if (alreadyWarned == FALSE) {
+ errorMsg("Absolute path detected, removing leading slashes\n");
+ alreadyWarned = TRUE;
+ }
+ }
-/*
- * Write data to one or more blocks of the tar file.
- * The data is always padded out to a multiple of TAR_BLOCK_SIZE.
- * The errorFlag static variable is set on an error.
- */
-static void writeTarBlock (const char *buf, int len)
-{
- int partialLength;
- int completeLength;
- char fullBlock[TAR_BLOCK_SIZE];
-
- /*
- * If we had a write error before, then do nothing more.
- */
- if (errorFlag==TRUE)
- return;
-
- /*
- * Get the amount of complete and partial blocks.
- */
- partialLength = len % TAR_BLOCK_SIZE;
- completeLength = len - partialLength;
-
- /*
- * Write all of the complete blocks.
- */
- if ((completeLength > 0) && !fullWrite (tarFd, buf, completeLength)) {
- perror (tarName);
-
- errorFlag = TRUE;
-
- return;
- }
-
- /*
- * If there are no partial blocks left, we are done.
- */
- if (partialLength == 0)
- return;
-
- /*
- * Copy the partial data into a complete block, and pad the rest
- * of it with zeroes.
- */
- memcpy (fullBlock, buf + completeLength, partialLength);
- memset (fullBlock + partialLength, 0, TAR_BLOCK_SIZE - partialLength);
-
- /*
- * Write the last complete block.
- */
- if (!fullWrite (tarFd, fullBlock, TAR_BLOCK_SIZE)) {
- perror (tarName);
-
- errorFlag = 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
-/*
- * 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];
-
- /*
- * 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;
-
- /*
- * If the string is too large, suppress the leading space.
- */
- 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;
+ /* 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", tarName, strerror(errno));
+ return ( FALSE);
+ }
+ else
+ return( status);
+
+ /* Stuff to do when we are done */
+endgame:
+ close( tarFd);
+ if ( *(header.name) == '\0' ) {
+ if (errorFlag==FALSE)
+ return( TRUE);
+ }
+ return( FALSE);
}
-#endif
-/* END CODE */
projects / oweals / busybox.git / blobdiff