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-rw-r--r--archival/tar.c1024
-rw-r--r--tar.c1024
2 files changed, 626 insertions, 1422 deletions
diff --git a/archival/tar.c b/archival/tar.c
index 389d7f0..cd56339 100644
--- a/archival/tar.c
+++ b/archival/tar.c
@@ -2,6 +2,9 @@
/*
* Mini tar implementation for busybox
*
+ * Modifed to use common extraction code used by ar, cpio, dpkg-deb, dpkg
+ * Glenn McGrath <bug1@optushome.com.au>
+ *
* 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.)
@@ -35,35 +38,36 @@
*
*/
-
-#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <utime.h>
-#include <sys/types.h>
-#include <sys/sysmacros.h>
#include <getopt.h>
-#include <fnmatch.h>
-#include <string.h>
+#include <search.h>
+#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
+#include <fnmatch.h>
+#include <string.h>
+#include <errno.h>
#include "busybox.h"
+#ifdef BB_FEATURE_TAR_CREATE
+
/* 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 */
-enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
+# 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 */
+{ /* byte offset */
char name[NAME_SIZE]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
@@ -84,697 +88,6 @@ struct TarHeader
};
typedef struct TarHeader TarHeader;
-
-/* A few useful constants */
-#define TAR_MAGIC "ustar" /* ustar and a null */
-#define TAR_VERSION " " /* Be compatable with GNU tar format */
-static const int TAR_MAGIC_LEN = 6;
-static const int TAR_VERSION_LEN = 2;
-static const int TAR_BLOCK_SIZE = 512;
-
-/* A nice enum with all the possible tar file content types */
-enum TarFileType
-{
- REGTYPE = '0', /* regular file */
- REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
- LNKTYPE = '1', /* hard link */
- SYMTYPE = '2', /* symbolic link */
- CHRTYPE = '3', /* character special */
- BLKTYPE = '4', /* block special */
- DIRTYPE = '5', /* directory */
- FIFOTYPE = '6', /* FIFO special */
- CONTTYPE = '7', /* reserved */
- GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
- GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
-};
-typedef enum TarFileType TarFileType;
-
-/* This struct ignores magic, non-numeric user name,
- * non-numeric group name, and the checksum, since
- * these are all ignored by BusyBox tar. */
-struct TarInfo
-{
- int tarFd; /* An open file descriptor for reading from the tarball */
- char * name; /* File name */
- mode_t mode; /* Unix mode, including device bits. */
- uid_t uid; /* Numeric UID */
- gid_t gid; /* Numeric GID */
- size_t size; /* Size of file */
- time_t mtime; /* Last-modified time */
- enum TarFileType type; /* Regular, directory, link, etc. */
- char * linkname; /* Name for symbolic and hard links */
- long devmajor; /* Major number for special device */
- long devminor; /* Minor number for special device */
-};
-typedef struct TarInfo TarInfo;
-
-/* Local procedures to restore files from a tar file. */
-static int readTarFile(int tarFd, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, char** extractList,
- char** excludeList);
-
-#ifdef BB_FEATURE_TAR_CREATE
-/* Local procedures to save files into a tar file. */
-static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
- char** excludeList);
-#endif
-
-#if defined BB_FEATURE_TAR_EXCLUDE
-static struct option longopts[] = {
- { "exclude", 1, NULL, 'e' },
- { NULL, 0, NULL, 0 }
-};
-#endif
-
-extern int tar_main(int argc, char **argv)
-{
- char** excludeList=NULL;
- char** extractList=NULL;
- const char *tarName="-";
- const char *cwd=NULL;
-#if defined BB_FEATURE_TAR_EXCLUDE
- int excludeListSize=0;
- FILE *fileList;
- char file[256];
-#endif
-#if defined BB_FEATURE_TAR_GZIP
- FILE *comp_file = NULL;
- int unzipFlag = FALSE;
-#endif
- int listFlag = FALSE;
- int extractFlag = FALSE;
- int createFlag = FALSE;
- int verboseFlag = FALSE;
- int tostdoutFlag = FALSE;
- int status = FALSE;
- int opt;
- pid_t pid;
-
- if (argc <= 1)
- show_usage();
-
- if (argv[1][0] != '-') {
- char *tmp = xmalloc(strlen(argv[1]) + 2);
- tmp[0] = '-';
- strcpy(tmp + 1, argv[1]);
- argv[1] = tmp;
- }
-
- while (
-#ifndef BB_FEATURE_TAR_EXCLUDE
- (opt = getopt(argc, argv, "cxtzvOf:pC:"))
-#else
- (opt = getopt_long(argc, argv, "cxtzvOf:X:pC:", longopts, NULL))
-#endif
- > 0) {
- switch (opt) {
- case 'c':
- if (extractFlag == TRUE || listFlag == TRUE)
- goto flagError;
- createFlag = TRUE;
- break;
- case 'x':
- if (listFlag == TRUE || createFlag == TRUE)
- goto flagError;
- extractFlag = TRUE;
- break;
- case 't':
- if (extractFlag == TRUE || createFlag == TRUE)
- goto flagError;
- listFlag = TRUE;
- break;
-#ifdef BB_FEATURE_TAR_GZIP
- case 'z':
- unzipFlag = TRUE;
- break;
-#endif
- case 'v':
- verboseFlag = TRUE;
- break;
- case 'O':
- tostdoutFlag = TRUE;
- break;
- case 'f':
- if (*tarName != '-')
- error_msg_and_die( "Only one 'f' option allowed");
- tarName = optarg;
- break;
-#if defined BB_FEATURE_TAR_EXCLUDE
- case 'e':
- excludeList=xrealloc( excludeList,
- sizeof(char *) * (excludeListSize+2));
- excludeList[excludeListSize] = optarg;
- /* Tack a NULL onto the end of the list */
- excludeList[++excludeListSize] = NULL;
- case 'X':
- fileList = xfopen(optarg, "r");
- while (fgets(file, sizeof(file), fileList) != NULL) {
- excludeList = xrealloc(excludeList,
- sizeof(char *) * (excludeListSize+2));
- chomp(file);
- excludeList[excludeListSize] = xstrdup(file);
- /* Tack a NULL onto the end of the list */
- excludeList[++excludeListSize] = NULL;
- }
- fclose(fileList);
- break;
-#endif
- case 'p':
- break;
- case 'C':
- cwd = xgetcwd((char *)cwd);
- if (chdir(optarg)) {
- printf("cd: %s: %s\n", optarg, strerror(errno));
- return EXIT_FAILURE;
- }
- break;
- default:
- show_usage();
- }
- }
-
- /*
- * Do the correct type of action supplying the rest of the
- * command line arguments as the list of files to process.
- */
- if (createFlag == TRUE) {
-#ifndef BB_FEATURE_TAR_CREATE
- error_msg_and_die( "This version of tar was not compiled with tar creation support.");
-#else
-#ifdef BB_FEATURE_TAR_GZIP
- if (unzipFlag==TRUE)
- error_msg_and_die("Creation of compressed not internally support by tar, pipe to busybox gunzip");
-#endif
- status = writeTarFile(tarName, verboseFlag, argv + optind, excludeList);
-#endif
- }
- if (listFlag == TRUE || extractFlag == TRUE) {
- int tarFd;
- if (argv[optind])
- extractList = argv + optind;
- /* Open the tar file for reading. */
- if (!strcmp(tarName, "-"))
- tarFd = fileno(stdin);
- else
- tarFd = open(tarName, O_RDONLY);
- if (tarFd < 0)
- perror_msg_and_die("Error opening '%s'", tarName);
-
-#ifdef BB_FEATURE_TAR_GZIP
- /* unzip tarFd in a seperate process */
- if (unzipFlag == TRUE) {
- comp_file = fdopen(tarFd, "r");
-
- /* set the buffer size */
- setvbuf(comp_file, NULL, _IOFBF, 0x8000);
-
- if ((tarFd = fileno(gz_open(comp_file, &pid))) == EXIT_FAILURE) {
- error_msg_and_die("Couldnt unzip file");
- }
- }
-#endif
- status = readTarFile(tarFd, extractFlag, listFlag, tostdoutFlag,
- verboseFlag, extractList, excludeList);
- close(tarFd);
-#ifdef BB_FEATURE_TAR_GZIP
- if (unzipFlag == TRUE) {
- gz_close(pid);
- fclose(comp_file);
- }
-#endif
- }
-
- if (cwd)
- chdir(cwd);
- if (status == TRUE)
- return EXIT_SUCCESS;
- else
- return EXIT_FAILURE;
-
- flagError:
- error_msg_and_die( "Exactly one of 'c', 'x' or 't' must be specified");
-}
-
-static void
-fixUpPermissions(TarInfo *header)
-{
- struct utimbuf t;
- /* Now set permissions etc. for the new file */
- chown(header->name, header->uid, header->gid);
- chmod(header->name, header->mode);
- /* Reset the time */
- t.actime = time(0);
- t.modtime = header->mtime;
- utime(header->name, &t);
-}
-
-static int
-tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- size_t writeSize;
- size_t readSize;
- size_t actualWriteSz;
- char buffer[20 * TAR_BLOCK_SIZE];
- size_t size = header->size;
- int outFd=fileno(stdout);
-
- /* Open the file to be written, if a file is supposed to be written */
- if (extractFlag==TRUE && tostdoutFlag==FALSE) {
- /* Create the path to the file, just in case it isn't there...
- * This should not screw up path permissions or anything. */
- char *buf, *dir;
- buf = xstrdup (header->name);
- dir = dirname (buf);
- make_directory (dir, -1, FILEUTILS_RECUR);
- free (buf);
- if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
- header->mode & ~S_IFMT)) < 0) {
- error_msg(io_error, header->name, strerror(errno));
- return( FALSE);
- }
- }
-
- /* Write out the file, if we are supposed to be doing that */
- while ( size > 0 ) {
- actualWriteSz=0;
- if ( size > sizeof(buffer) )
- writeSize = readSize = sizeof(buffer);
- else {
- int mod = size % TAR_BLOCK_SIZE;
- if ( mod != 0 )
- readSize = size + (TAR_BLOCK_SIZE - mod);
- else
- readSize = size;
- writeSize = size;
- }
- if ( (readSize = full_read(header->tarFd, buffer, readSize)) <= 0 ) {
- /* Tarball seems to have a problem */
- error_msg("Unexpected EOF in archive");
- return( FALSE);
- }
- if ( readSize < writeSize )
- writeSize = readSize;
-
- /* Write out the file, if we are supposed to be doing that */
- if (extractFlag==TRUE) {
-
- if ((actualWriteSz=full_write(outFd, buffer, writeSize)) != writeSize ) {
- /* Output file seems to have a problem */
- error_msg(io_error, header->name, strerror(errno));
- return( FALSE);
- }
- } else {
- actualWriteSz=writeSize;
- }
-
- size -= actualWriteSz;
- }
-
- /* Now we are done writing the file out, so try
- * and fix up the permissions and whatnot */
- if (extractFlag==TRUE && tostdoutFlag==FALSE) {
- close(outFd);
- fixUpPermissions(header);
- }
- return( TRUE);
-}
-
-static int
-tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
- if (make_directory(header->name, header->mode, FILEUTILS_RECUR) < 0)
- return( FALSE);
-
- fixUpPermissions(header);
- return( TRUE);
-}
-
-static int
-tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
- if (link(header->linkname, header->name) < 0) {
- perror_msg("%s: Cannot create hard link to '%s'", header->name,
- header->linkname);
- return( FALSE);
- }
-
- /* Now set permissions etc. for the new directory */
- fixUpPermissions(header);
- return( TRUE);
-}
-
-static int
-tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
-#ifdef S_ISLNK
- if (symlink(header->linkname, header->name) < 0) {
- perror_msg("%s: Cannot create symlink to '%s'", header->name,
- header->linkname);
- return( FALSE);
- }
- /* Try to change ownership of the symlink.
- * If libs doesn't support that, don't bother.
- * Changing the pointed-to-file is the Wrong Thing(tm).
- */
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
- lchown(header->name, header->uid, header->gid);
-#endif
-
- /* Do not change permissions or date on symlink,
- * since it changes the pointed to file instead. duh. */
-#else
- error_msg("%s: Cannot create symlink to '%s': %s",
- header->name, header->linkname,
- "symlinks not supported");
-#endif
- return( TRUE);
-}
-
-static int
-tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
- if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
- if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
- perror_msg("%s: Cannot mknod", header->name);
- return( FALSE);
- }
- } else if (S_ISFIFO(header->mode)) {
- if (mkfifo(header->name, header->mode) < 0) {
- perror_msg("%s: Cannot mkfifo", header->name);
- return( FALSE);
- }
- }
-
- /* Now set permissions etc. for the new directory */
- fixUpPermissions(header);
- return( TRUE);
-}
-
-/* Parse the tar header and fill in the nice struct with the details */
-static int
-readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
-{
- int i;
- long chksum, sum=0;
- unsigned char *s = (unsigned char *)rawHeader;
-
- header->name = rawHeader->name;
- /* Check for and relativify any absolute paths */
- if ( *(header->name) == '/' ) {
- static int alreadyWarned=FALSE;
-
- while (*(header->name) == '/')
- header->name++;
-
- if (alreadyWarned == FALSE) {
- error_msg("Removing leading '/' from member names");
- alreadyWarned = TRUE;
- }
- }
-
- header->mode = strtol(rawHeader->mode, NULL, 8);
- header->uid = strtol(rawHeader->uid, NULL, 8);
- header->gid = strtol(rawHeader->gid, NULL, 8);
- header->size = strtol(rawHeader->size, NULL, 8);
- header->mtime = strtol(rawHeader->mtime, NULL, 8);
- chksum = strtol(rawHeader->chksum, NULL, 8);
- header->type = rawHeader->typeflag;
- header->linkname = rawHeader->linkname;
- header->devmajor = strtol(rawHeader->devmajor, NULL, 8);
- header->devminor = strtol(rawHeader->devminor, NULL, 8);
-
- /* Check the checksum */
- for (i = sizeof(*rawHeader); i-- != 0;) {
- sum += *s++;
- }
- /* Remove the effects of the checksum field (replace
- * with blanks for the purposes of the checksum) */
- s = rawHeader->chksum;
- for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
- sum -= *s++;
- }
- sum += ' ' * sizeof(rawHeader->chksum);
- if (sum == chksum )
- return ( TRUE);
- return( FALSE);
-}
-
-static int exclude_file(char **excluded_files, const char *file)
-{
- int i;
-
- if (excluded_files == NULL)
- return 0;
-
- for (i = 0; excluded_files[i] != NULL; i++) {
- if (excluded_files[i][0] == '/') {
- if (fnmatch(excluded_files[i], file,
- FNM_PATHNAME | FNM_LEADING_DIR) == 0)
- return 1;
- } else {
- const char *p;
-
- for (p = file; p[0] != '\0'; p++) {
- if ((p == file || p[-1] == '/') && p[0] != '/' &&
- fnmatch(excluded_files[i], p,
- FNM_PATHNAME | FNM_LEADING_DIR) == 0)
- return 1;
- }
- }
- }
-
- return 0;
-}
-
-static int extract_file(char **extract_files, const char *file)
-{
- int i;
-
- if (extract_files == NULL)
- return 1;
-
- for (i = 0; extract_files[i] != NULL; i++) {
- if (fnmatch(extract_files[i], file, FNM_LEADING_DIR) == 0)
- return 1;
- }
-
- return 0;
-}
-
-/*
- * Read a tar file and extract or list the specified files within it.
- * If the list is empty than all files are extracted or listed.
- */
-static int readTarFile(int tarFd, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, char** extractList,
- char** excludeList)
-{
- int status;
- int errorFlag=FALSE;
- int skipNextHeaderFlag=FALSE;
- TarHeader rawHeader;
- TarInfo header;
-
- /* Read the tar file, and iterate over it one file at a time */
- while ( (status = full_read(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
-
- /* Try to read the header */
- if ( readTarHeader(&rawHeader, &header) == FALSE ) {
- if ( *(header.name) == '\0' ) {
- goto endgame;
- } else {
- errorFlag=TRUE;
- error_msg("Bad tar header, skipping");
- continue;
- }
- }
- if ( *(header.name) == '\0' )
- continue;
- header.tarFd = tarFd;
-
- /* Skip funky extra GNU headers that precede long files */
- if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
- skipNextHeaderFlag=TRUE;
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- continue;
- }
- if ( skipNextHeaderFlag == TRUE ) {
- skipNextHeaderFlag=FALSE;
- error_msg(name_longer_than_foo, NAME_SIZE);
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- continue;
- }
-
-#if defined BB_FEATURE_TAR_EXCLUDE
- if (exclude_file(excludeList, header.name)) {
- /* There are not the droids you're looking for, move along */
- /* If it is a regular file, pretend to extract it with
- * the extractFlag set to FALSE, so the junk in the tarball
- * is properly skipped over */
- if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- }
- continue;
- }
-#endif
-
- if (!extract_file(extractList, header.name)) {
- /* There are not the droids you're looking for, move along */
- /* If it is a regular file, pretend to extract it with
- * the extractFlag set to FALSE, so the junk in the tarball
- * is properly skipped over */
- if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- }
- continue;
- }
-
- if (listFlag == TRUE) {
- /* Special treatment if the list (-t) flag is on */
- if (verboseFlag == TRUE) {
- int len, len1;
- char buf[35];
- struct tm *tm = localtime (&(header.mtime));
-
- len=printf("%s ", mode_string(header.mode));
- my_getpwuid(buf, header.uid);
- if (! *buf)
- len+=printf("%d", header.uid);
- else
- len+=printf("%s", buf);
- my_getgrgid(buf, header.gid);
- if (! *buf)
- len+=printf("/%-d ", header.gid);
- else
- len+=printf("/%-s ", buf);
-
- if (header.type==CHRTYPE || header.type==BLKTYPE) {
- len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
- header.devmajor, header.devminor);
- } else {
- len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
- }
- /* Jump through some hoops to make the columns match up */
- for(;(len+len1)<31;len++)
- printf(" ");
- printf(buf);
-
- /* Use ISO 8610 time format */
- if (tm) {
- printf ("%04d-%02d-%02d %02d:%02d:%02d ",
- tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
- tm->tm_hour, tm->tm_min, tm->tm_sec);
- }
- }
- printf("%s", header.name);
- if (verboseFlag == TRUE) {
- if (header.type==LNKTYPE) /* If this is a link, say so */
- printf(" link to %s", header.linkname);
- else if (header.type==SYMTYPE)
- printf(" -> %s", header.linkname);
- }
- printf("\n");
- }
-
- /* List contents if we are supposed to do that */
- if (verboseFlag == TRUE && extractFlag == TRUE) {
- /* Now the normal listing */
- FILE *vbFd = stdout;
- if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
- vbFd = stderr;
- fprintf(vbFd, "%s\n", header.name);
- }
-
- /* Remove files if we would overwrite them */
- if (extractFlag == TRUE && tostdoutFlag == FALSE)
- unlink(header.name);
-
- /* If we got here, we can be certain we have a legitimate
- * header to work with. So work with it. */
- switch ( header.type ) {
- case REGTYPE:
- case REGTYPE0:
- /* If the name ends in a '/' then assume it is
- * supposed to be a directory, and fall through */
- if (!last_char_is(header.name,'/')) {
- if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- }
- case DIRTYPE:
- if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- case LNKTYPE:
- if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- case SYMTYPE:
- if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- case CHRTYPE:
- case BLKTYPE:
- case FIFOTYPE:
- if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
-#if 0
- /* Handled earlier */
- case GNULONGNAME:
- case GNULONGLINK:
- skipNextHeaderFlag=TRUE;
- break;
-#endif
- default:
- error_msg("Unknown file type '%c' in tar file", header.type);
- close( tarFd);
- return( FALSE);
- }
- }
- close(tarFd);
- if (status > 0) {
- /* Bummer - we read a partial header */
- perror_msg("Error reading tar file");
- return ( FALSE);
- }
- else if (errorFlag==TRUE) {
- error_msg( "Error exit delayed from previous errors");
- return( FALSE);
- } else
- return( status);
-
- /* Stuff to do when we are done */
-endgame:
- close( tarFd);
- if ( *(header.name) == '\0' ) {
- if (errorFlag==TRUE)
- error_msg( "Error exit delayed from previous errors");
- else
- return( TRUE);
- }
- return( FALSE);
-}
-
-
-#ifdef BB_FEATURE_TAR_CREATE
-
/*
** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
** the only functions that deal with the HardLinkInfo structure.
@@ -807,6 +120,22 @@ struct TarBallInfo
};
typedef struct TarBallInfo TarBallInfo;
+/* A nice enum with all the possible tar file content types */
+enum TarFileType
+{
+ REGTYPE = '0', /* regular file */
+ REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
+ LNKTYPE = '1', /* hard link */
+ SYMTYPE = '2', /* symbolic link */
+ CHRTYPE = '3', /* character special */
+ BLKTYPE = '4', /* block special */
+ DIRTYPE = '5', /* directory */
+ FIFOTYPE = '6', /* FIFO special */
+ CONTTYPE = '7', /* reserved */
+ GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
+ GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
+};
+typedef enum TarFileType TarFileType;
/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static void
@@ -985,6 +314,32 @@ writeTarHeader(struct TarBallInfo *tbInfo, const char *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 writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
{
@@ -1040,11 +395,11 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf, void*
if (header_name[0] == '\0')
return TRUE;
-#if defined BB_FEATURE_TAR_EXCLUDE
+# if defined BB_FEATURE_TAR_EXCLUDE
if (exclude_file(tbInfo->excludeList, header_name)) {
return SKIP;
}
-#endif
+# endif //BB_FEATURE_TAR_EXCLUDE
if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) {
return( FALSE);
@@ -1144,7 +499,254 @@ static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
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);
+}
diff --git a/tar.c b/tar.c
index 389d7f0..cd56339 100644
--- a/tar.c
+++ b/tar.c
@@ -2,6 +2,9 @@
/*
* Mini tar implementation for busybox
*
+ * Modifed to use common extraction code used by ar, cpio, dpkg-deb, dpkg
+ * Glenn McGrath <bug1@optushome.com.au>
+ *
* 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.)
@@ -35,35 +38,36 @@
*
*/
-
-#include <stdio.h>
-#include <dirent.h>
-#include <errno.h>
#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <utime.h>
-#include <sys/types.h>
-#include <sys/sysmacros.h>
#include <getopt.h>
-#include <fnmatch.h>
-#include <string.h>
+#include <search.h>
+#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
+#include <fnmatch.h>
+#include <string.h>
+#include <errno.h>
#include "busybox.h"
+#ifdef BB_FEATURE_TAR_CREATE
+
/* 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 */
-enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */
+# 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 */
+{ /* byte offset */
char name[NAME_SIZE]; /* 0-99 */
char mode[8]; /* 100-107 */
char uid[8]; /* 108-115 */
@@ -84,697 +88,6 @@ struct TarHeader
};
typedef struct TarHeader TarHeader;
-
-/* A few useful constants */
-#define TAR_MAGIC "ustar" /* ustar and a null */
-#define TAR_VERSION " " /* Be compatable with GNU tar format */
-static const int TAR_MAGIC_LEN = 6;
-static const int TAR_VERSION_LEN = 2;
-static const int TAR_BLOCK_SIZE = 512;
-
-/* A nice enum with all the possible tar file content types */
-enum TarFileType
-{
- REGTYPE = '0', /* regular file */
- REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
- LNKTYPE = '1', /* hard link */
- SYMTYPE = '2', /* symbolic link */
- CHRTYPE = '3', /* character special */
- BLKTYPE = '4', /* block special */
- DIRTYPE = '5', /* directory */
- FIFOTYPE = '6', /* FIFO special */
- CONTTYPE = '7', /* reserved */
- GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
- GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
-};
-typedef enum TarFileType TarFileType;
-
-/* This struct ignores magic, non-numeric user name,
- * non-numeric group name, and the checksum, since
- * these are all ignored by BusyBox tar. */
-struct TarInfo
-{
- int tarFd; /* An open file descriptor for reading from the tarball */
- char * name; /* File name */
- mode_t mode; /* Unix mode, including device bits. */
- uid_t uid; /* Numeric UID */
- gid_t gid; /* Numeric GID */
- size_t size; /* Size of file */
- time_t mtime; /* Last-modified time */
- enum TarFileType type; /* Regular, directory, link, etc. */
- char * linkname; /* Name for symbolic and hard links */
- long devmajor; /* Major number for special device */
- long devminor; /* Minor number for special device */
-};
-typedef struct TarInfo TarInfo;
-
-/* Local procedures to restore files from a tar file. */
-static int readTarFile(int tarFd, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, char** extractList,
- char** excludeList);
-
-#ifdef BB_FEATURE_TAR_CREATE
-/* Local procedures to save files into a tar file. */
-static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
- char** excludeList);
-#endif
-
-#if defined BB_FEATURE_TAR_EXCLUDE
-static struct option longopts[] = {
- { "exclude", 1, NULL, 'e' },
- { NULL, 0, NULL, 0 }
-};
-#endif
-
-extern int tar_main(int argc, char **argv)
-{
- char** excludeList=NULL;
- char** extractList=NULL;
- const char *tarName="-";
- const char *cwd=NULL;
-#if defined BB_FEATURE_TAR_EXCLUDE
- int excludeListSize=0;
- FILE *fileList;
- char file[256];
-#endif
-#if defined BB_FEATURE_TAR_GZIP
- FILE *comp_file = NULL;
- int unzipFlag = FALSE;
-#endif
- int listFlag = FALSE;
- int extractFlag = FALSE;
- int createFlag = FALSE;
- int verboseFlag = FALSE;
- int tostdoutFlag = FALSE;
- int status = FALSE;
- int opt;
- pid_t pid;
-
- if (argc <= 1)
- show_usage();
-
- if (argv[1][0] != '-') {
- char *tmp = xmalloc(strlen(argv[1]) + 2);
- tmp[0] = '-';
- strcpy(tmp + 1, argv[1]);
- argv[1] = tmp;
- }
-
- while (
-#ifndef BB_FEATURE_TAR_EXCLUDE
- (opt = getopt(argc, argv, "cxtzvOf:pC:"))
-#else
- (opt = getopt_long(argc, argv, "cxtzvOf:X:pC:", longopts, NULL))
-#endif
- > 0) {
- switch (opt) {
- case 'c':
- if (extractFlag == TRUE || listFlag == TRUE)
- goto flagError;
- createFlag = TRUE;
- break;
- case 'x':
- if (listFlag == TRUE || createFlag == TRUE)
- goto flagError;
- extractFlag = TRUE;
- break;
- case 't':
- if (extractFlag == TRUE || createFlag == TRUE)
- goto flagError;
- listFlag = TRUE;
- break;
-#ifdef BB_FEATURE_TAR_GZIP
- case 'z':
- unzipFlag = TRUE;
- break;
-#endif
- case 'v':
- verboseFlag = TRUE;
- break;
- case 'O':
- tostdoutFlag = TRUE;
- break;
- case 'f':
- if (*tarName != '-')
- error_msg_and_die( "Only one 'f' option allowed");
- tarName = optarg;
- break;
-#if defined BB_FEATURE_TAR_EXCLUDE
- case 'e':
- excludeList=xrealloc( excludeList,
- sizeof(char *) * (excludeListSize+2));
- excludeList[excludeListSize] = optarg;
- /* Tack a NULL onto the end of the list */
- excludeList[++excludeListSize] = NULL;
- case 'X':
- fileList = xfopen(optarg, "r");
- while (fgets(file, sizeof(file), fileList) != NULL) {
- excludeList = xrealloc(excludeList,
- sizeof(char *) * (excludeListSize+2));
- chomp(file);
- excludeList[excludeListSize] = xstrdup(file);
- /* Tack a NULL onto the end of the list */
- excludeList[++excludeListSize] = NULL;
- }
- fclose(fileList);
- break;
-#endif
- case 'p':
- break;
- case 'C':
- cwd = xgetcwd((char *)cwd);
- if (chdir(optarg)) {
- printf("cd: %s: %s\n", optarg, strerror(errno));
- return EXIT_FAILURE;
- }
- break;
- default:
- show_usage();
- }
- }
-
- /*
- * Do the correct type of action supplying the rest of the
- * command line arguments as the list of files to process.
- */
- if (createFlag == TRUE) {
-#ifndef BB_FEATURE_TAR_CREATE
- error_msg_and_die( "This version of tar was not compiled with tar creation support.");
-#else
-#ifdef BB_FEATURE_TAR_GZIP
- if (unzipFlag==TRUE)
- error_msg_and_die("Creation of compressed not internally support by tar, pipe to busybox gunzip");
-#endif
- status = writeTarFile(tarName, verboseFlag, argv + optind, excludeList);
-#endif
- }
- if (listFlag == TRUE || extractFlag == TRUE) {
- int tarFd;
- if (argv[optind])
- extractList = argv + optind;
- /* Open the tar file for reading. */
- if (!strcmp(tarName, "-"))
- tarFd = fileno(stdin);
- else
- tarFd = open(tarName, O_RDONLY);
- if (tarFd < 0)
- perror_msg_and_die("Error opening '%s'", tarName);
-
-#ifdef BB_FEATURE_TAR_GZIP
- /* unzip tarFd in a seperate process */
- if (unzipFlag == TRUE) {
- comp_file = fdopen(tarFd, "r");
-
- /* set the buffer size */
- setvbuf(comp_file, NULL, _IOFBF, 0x8000);
-
- if ((tarFd = fileno(gz_open(comp_file, &pid))) == EXIT_FAILURE) {
- error_msg_and_die("Couldnt unzip file");
- }
- }
-#endif
- status = readTarFile(tarFd, extractFlag, listFlag, tostdoutFlag,
- verboseFlag, extractList, excludeList);
- close(tarFd);
-#ifdef BB_FEATURE_TAR_GZIP
- if (unzipFlag == TRUE) {
- gz_close(pid);
- fclose(comp_file);
- }
-#endif
- }
-
- if (cwd)
- chdir(cwd);
- if (status == TRUE)
- return EXIT_SUCCESS;
- else
- return EXIT_FAILURE;
-
- flagError:
- error_msg_and_die( "Exactly one of 'c', 'x' or 't' must be specified");
-}
-
-static void
-fixUpPermissions(TarInfo *header)
-{
- struct utimbuf t;
- /* Now set permissions etc. for the new file */
- chown(header->name, header->uid, header->gid);
- chmod(header->name, header->mode);
- /* Reset the time */
- t.actime = time(0);
- t.modtime = header->mtime;
- utime(header->name, &t);
-}
-
-static int
-tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- size_t writeSize;
- size_t readSize;
- size_t actualWriteSz;
- char buffer[20 * TAR_BLOCK_SIZE];
- size_t size = header->size;
- int outFd=fileno(stdout);
-
- /* Open the file to be written, if a file is supposed to be written */
- if (extractFlag==TRUE && tostdoutFlag==FALSE) {
- /* Create the path to the file, just in case it isn't there...
- * This should not screw up path permissions or anything. */
- char *buf, *dir;
- buf = xstrdup (header->name);
- dir = dirname (buf);
- make_directory (dir, -1, FILEUTILS_RECUR);
- free (buf);
- if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY,
- header->mode & ~S_IFMT)) < 0) {
- error_msg(io_error, header->name, strerror(errno));
- return( FALSE);
- }
- }
-
- /* Write out the file, if we are supposed to be doing that */
- while ( size > 0 ) {
- actualWriteSz=0;
- if ( size > sizeof(buffer) )
- writeSize = readSize = sizeof(buffer);
- else {
- int mod = size % TAR_BLOCK_SIZE;
- if ( mod != 0 )
- readSize = size + (TAR_BLOCK_SIZE - mod);
- else
- readSize = size;
- writeSize = size;
- }
- if ( (readSize = full_read(header->tarFd, buffer, readSize)) <= 0 ) {
- /* Tarball seems to have a problem */
- error_msg("Unexpected EOF in archive");
- return( FALSE);
- }
- if ( readSize < writeSize )
- writeSize = readSize;
-
- /* Write out the file, if we are supposed to be doing that */
- if (extractFlag==TRUE) {
-
- if ((actualWriteSz=full_write(outFd, buffer, writeSize)) != writeSize ) {
- /* Output file seems to have a problem */
- error_msg(io_error, header->name, strerror(errno));
- return( FALSE);
- }
- } else {
- actualWriteSz=writeSize;
- }
-
- size -= actualWriteSz;
- }
-
- /* Now we are done writing the file out, so try
- * and fix up the permissions and whatnot */
- if (extractFlag==TRUE && tostdoutFlag==FALSE) {
- close(outFd);
- fixUpPermissions(header);
- }
- return( TRUE);
-}
-
-static int
-tarExtractDirectory(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
- if (make_directory(header->name, header->mode, FILEUTILS_RECUR) < 0)
- return( FALSE);
-
- fixUpPermissions(header);
- return( TRUE);
-}
-
-static int
-tarExtractHardLink(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
- if (link(header->linkname, header->name) < 0) {
- perror_msg("%s: Cannot create hard link to '%s'", header->name,
- header->linkname);
- return( FALSE);
- }
-
- /* Now set permissions etc. for the new directory */
- fixUpPermissions(header);
- return( TRUE);
-}
-
-static int
-tarExtractSymLink(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
-#ifdef S_ISLNK
- if (symlink(header->linkname, header->name) < 0) {
- perror_msg("%s: Cannot create symlink to '%s'", header->name,
- header->linkname);
- return( FALSE);
- }
- /* Try to change ownership of the symlink.
- * If libs doesn't support that, don't bother.
- * Changing the pointed-to-file is the Wrong Thing(tm).
- */
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
- lchown(header->name, header->uid, header->gid);
-#endif
-
- /* Do not change permissions or date on symlink,
- * since it changes the pointed to file instead. duh. */
-#else
- error_msg("%s: Cannot create symlink to '%s': %s",
- header->name, header->linkname,
- "symlinks not supported");
-#endif
- return( TRUE);
-}
-
-static int
-tarExtractSpecial(TarInfo *header, int extractFlag, int tostdoutFlag)
-{
- if (extractFlag==FALSE || tostdoutFlag==TRUE)
- return( TRUE);
-
- if (S_ISCHR(header->mode) || S_ISBLK(header->mode) || S_ISSOCK(header->mode)) {
- if (mknod(header->name, header->mode, makedev(header->devmajor, header->devminor)) < 0) {
- perror_msg("%s: Cannot mknod", header->name);
- return( FALSE);
- }
- } else if (S_ISFIFO(header->mode)) {
- if (mkfifo(header->name, header->mode) < 0) {
- perror_msg("%s: Cannot mkfifo", header->name);
- return( FALSE);
- }
- }
-
- /* Now set permissions etc. for the new directory */
- fixUpPermissions(header);
- return( TRUE);
-}
-
-/* Parse the tar header and fill in the nice struct with the details */
-static int
-readTarHeader(struct TarHeader *rawHeader, struct TarInfo *header)
-{
- int i;
- long chksum, sum=0;
- unsigned char *s = (unsigned char *)rawHeader;
-
- header->name = rawHeader->name;
- /* Check for and relativify any absolute paths */
- if ( *(header->name) == '/' ) {
- static int alreadyWarned=FALSE;
-
- while (*(header->name) == '/')
- header->name++;
-
- if (alreadyWarned == FALSE) {
- error_msg("Removing leading '/' from member names");
- alreadyWarned = TRUE;
- }
- }
-
- header->mode = strtol(rawHeader->mode, NULL, 8);
- header->uid = strtol(rawHeader->uid, NULL, 8);
- header->gid = strtol(rawHeader->gid, NULL, 8);
- header->size = strtol(rawHeader->size, NULL, 8);
- header->mtime = strtol(rawHeader->mtime, NULL, 8);
- chksum = strtol(rawHeader->chksum, NULL, 8);
- header->type = rawHeader->typeflag;
- header->linkname = rawHeader->linkname;
- header->devmajor = strtol(rawHeader->devmajor, NULL, 8);
- header->devminor = strtol(rawHeader->devminor, NULL, 8);
-
- /* Check the checksum */
- for (i = sizeof(*rawHeader); i-- != 0;) {
- sum += *s++;
- }
- /* Remove the effects of the checksum field (replace
- * with blanks for the purposes of the checksum) */
- s = rawHeader->chksum;
- for (i = sizeof(rawHeader->chksum) ; i-- != 0;) {
- sum -= *s++;
- }
- sum += ' ' * sizeof(rawHeader->chksum);
- if (sum == chksum )
- return ( TRUE);
- return( FALSE);
-}
-
-static int exclude_file(char **excluded_files, const char *file)
-{
- int i;
-
- if (excluded_files == NULL)
- return 0;
-
- for (i = 0; excluded_files[i] != NULL; i++) {
- if (excluded_files[i][0] == '/') {
- if (fnmatch(excluded_files[i], file,
- FNM_PATHNAME | FNM_LEADING_DIR) == 0)
- return 1;
- } else {
- const char *p;
-
- for (p = file; p[0] != '\0'; p++) {
- if ((p == file || p[-1] == '/') && p[0] != '/' &&
- fnmatch(excluded_files[i], p,
- FNM_PATHNAME | FNM_LEADING_DIR) == 0)
- return 1;
- }
- }
- }
-
- return 0;
-}
-
-static int extract_file(char **extract_files, const char *file)
-{
- int i;
-
- if (extract_files == NULL)
- return 1;
-
- for (i = 0; extract_files[i] != NULL; i++) {
- if (fnmatch(extract_files[i], file, FNM_LEADING_DIR) == 0)
- return 1;
- }
-
- return 0;
-}
-
-/*
- * Read a tar file and extract or list the specified files within it.
- * If the list is empty than all files are extracted or listed.
- */
-static int readTarFile(int tarFd, int extractFlag, int listFlag,
- int tostdoutFlag, int verboseFlag, char** extractList,
- char** excludeList)
-{
- int status;
- int errorFlag=FALSE;
- int skipNextHeaderFlag=FALSE;
- TarHeader rawHeader;
- TarInfo header;
-
- /* Read the tar file, and iterate over it one file at a time */
- while ( (status = full_read(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) {
-
- /* Try to read the header */
- if ( readTarHeader(&rawHeader, &header) == FALSE ) {
- if ( *(header.name) == '\0' ) {
- goto endgame;
- } else {
- errorFlag=TRUE;
- error_msg("Bad tar header, skipping");
- continue;
- }
- }
- if ( *(header.name) == '\0' )
- continue;
- header.tarFd = tarFd;
-
- /* Skip funky extra GNU headers that precede long files */
- if ( (header.type == GNULONGNAME) || (header.type == GNULONGLINK) ) {
- skipNextHeaderFlag=TRUE;
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- continue;
- }
- if ( skipNextHeaderFlag == TRUE ) {
- skipNextHeaderFlag=FALSE;
- error_msg(name_longer_than_foo, NAME_SIZE);
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- continue;
- }
-
-#if defined BB_FEATURE_TAR_EXCLUDE
- if (exclude_file(excludeList, header.name)) {
- /* There are not the droids you're looking for, move along */
- /* If it is a regular file, pretend to extract it with
- * the extractFlag set to FALSE, so the junk in the tarball
- * is properly skipped over */
- if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- }
- continue;
- }
-#endif
-
- if (!extract_file(extractList, header.name)) {
- /* There are not the droids you're looking for, move along */
- /* If it is a regular file, pretend to extract it with
- * the extractFlag set to FALSE, so the junk in the tarball
- * is properly skipped over */
- if ( header.type==REGTYPE || header.type==REGTYPE0 ) {
- if (tarExtractRegularFile(&header, FALSE, FALSE) == FALSE)
- errorFlag = TRUE;
- }
- continue;
- }
-
- if (listFlag == TRUE) {
- /* Special treatment if the list (-t) flag is on */
- if (verboseFlag == TRUE) {
- int len, len1;
- char buf[35];
- struct tm *tm = localtime (&(header.mtime));
-
- len=printf("%s ", mode_string(header.mode));
- my_getpwuid(buf, header.uid);
- if (! *buf)
- len+=printf("%d", header.uid);
- else
- len+=printf("%s", buf);
- my_getgrgid(buf, header.gid);
- if (! *buf)
- len+=printf("/%-d ", header.gid);
- else
- len+=printf("/%-s ", buf);
-
- if (header.type==CHRTYPE || header.type==BLKTYPE) {
- len1=snprintf(buf, sizeof(buf), "%ld,%-ld ",
- header.devmajor, header.devminor);
- } else {
- len1=snprintf(buf, sizeof(buf), "%lu ", (long)header.size);
- }
- /* Jump through some hoops to make the columns match up */
- for(;(len+len1)<31;len++)
- printf(" ");
- printf(buf);
-
- /* Use ISO 8610 time format */
- if (tm) {
- printf ("%04d-%02d-%02d %02d:%02d:%02d ",
- tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
- tm->tm_hour, tm->tm_min, tm->tm_sec);
- }
- }
- printf("%s", header.name);
- if (verboseFlag == TRUE) {
- if (header.type==LNKTYPE) /* If this is a link, say so */
- printf(" link to %s", header.linkname);
- else if (header.type==SYMTYPE)
- printf(" -> %s", header.linkname);
- }
- printf("\n");
- }
-
- /* List contents if we are supposed to do that */
- if (verboseFlag == TRUE && extractFlag == TRUE) {
- /* Now the normal listing */
- FILE *vbFd = stdout;
- if (tostdoutFlag == TRUE) // If the archive goes to stdout, verbose to stderr
- vbFd = stderr;
- fprintf(vbFd, "%s\n", header.name);
- }
-
- /* Remove files if we would overwrite them */
- if (extractFlag == TRUE && tostdoutFlag == FALSE)
- unlink(header.name);
-
- /* If we got here, we can be certain we have a legitimate
- * header to work with. So work with it. */
- switch ( header.type ) {
- case REGTYPE:
- case REGTYPE0:
- /* If the name ends in a '/' then assume it is
- * supposed to be a directory, and fall through */
- if (!last_char_is(header.name,'/')) {
- if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- }
- case DIRTYPE:
- if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- case LNKTYPE:
- if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- case SYMTYPE:
- if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
- case CHRTYPE:
- case BLKTYPE:
- case FIFOTYPE:
- if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE)
- errorFlag=TRUE;
- break;
-#if 0
- /* Handled earlier */
- case GNULONGNAME:
- case GNULONGLINK:
- skipNextHeaderFlag=TRUE;
- break;
-#endif
- default:
- error_msg("Unknown file type '%c' in tar file", header.type);
- close( tarFd);
- return( FALSE);
- }
- }
- close(tarFd);
- if (status > 0) {
- /* Bummer - we read a partial header */
- perror_msg("Error reading tar file");
- return ( FALSE);
- }
- else if (errorFlag==TRUE) {
- error_msg( "Error exit delayed from previous errors");
- return( FALSE);
- } else
- return( status);
-
- /* Stuff to do when we are done */
-endgame:
- close( tarFd);
- if ( *(header.name) == '\0' ) {
- if (errorFlag==TRUE)
- error_msg( "Error exit delayed from previous errors");
- else
- return( TRUE);
- }
- return( FALSE);
-}
-
-
-#ifdef BB_FEATURE_TAR_CREATE
-
/*
** writeTarFile(), writeFileToTarball(), and writeTarHeader() are
** the only functions that deal with the HardLinkInfo structure.
@@ -807,6 +120,22 @@ struct TarBallInfo
};
typedef struct TarBallInfo TarBallInfo;
+/* A nice enum with all the possible tar file content types */
+enum TarFileType
+{
+ REGTYPE = '0', /* regular file */
+ REGTYPE0 = '\0', /* regular file (ancient bug compat)*/
+ LNKTYPE = '1', /* hard link */
+ SYMTYPE = '2', /* symbolic link */
+ CHRTYPE = '3', /* character special */
+ BLKTYPE = '4', /* block special */
+ DIRTYPE = '5', /* directory */
+ FIFOTYPE = '6', /* FIFO special */
+ CONTTYPE = '7', /* reserved */
+ GNULONGLINK = 'K', /* GNU long (>100 chars) link name */
+ GNULONGNAME = 'L', /* GNU long (>100 chars) file name */
+};
+typedef enum TarFileType TarFileType;
/* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */
static void
@@ -985,6 +314,32 @@ writeTarHeader(struct TarBallInfo *tbInfo, const char *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 writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData)
{
@@ -1040,11 +395,11 @@ static int writeFileToTarball(const char *fileName, struct stat *statbuf, void*
if (header_name[0] == '\0')
return TRUE;
-#if defined BB_FEATURE_TAR_EXCLUDE
+# if defined BB_FEATURE_TAR_EXCLUDE
if (exclude_file(tbInfo->excludeList, header_name)) {
return SKIP;
}
-#endif
+# endif //BB_FEATURE_TAR_EXCLUDE
if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) {
return( FALSE);
@@ -1144,7 +499,254 @@ static int writeTarFile(const char* tarName, int verboseFlag, char **argv,
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);
+}
generated by cgit v1.1 at 2024-12-25 07:42:19 +0000