| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini tar implementation for busybox |
| * |
| * Note, that as of BusyBox-0.43, tar has been completely rewritten from the |
| * ground up. It still has remnents of the old code lying about, but it is |
| * very different now (i.e. cleaner, less global variables, etc) |
| * |
| * Copyright (C) 2000 by Lineo, inc. |
| * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> |
| * |
| * Based in part in the tar implementation in sash |
| * Copyright (c) 1999 by David I. Bell |
| * Permission is granted to use, distribute, or modify this source, |
| * provided that this copyright notice remains intact. |
| * Permission to distribute sash derived code under the GPL has been granted. |
| * |
| * Based in part on the tar implementation from busybox-0.28 |
| * Copyright (C) 1995 Bruce Perens |
| * This is free software under the GNU General Public License. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| |
| #include "internal.h" |
| #define BB_DECLARE_EXTERN |
| #define bb_need_io_error |
| #include "messages.c" |
| #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> |
| |
| |
| static const char tar_usage[] = |
| #ifdef BB_FEATURE_TAR_CREATE |
| "tar -[cxtvO] " |
| #else |
| "tar -[xtvO] " |
| #endif |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| "[--exclude File] " |
| #endif |
| "[-f tarFile] [FILE] ...\n" |
| #ifndef BB_FEATURE_TRIVIAL_HELP |
| "\nCreate, extract, or list files from a tar file. Note that\n" |
| "this version of tar treats hard links as separate files.\n\n" |
| "Main operation mode:\n" |
| #ifdef BB_FEATURE_TAR_CREATE |
| "\tc\t\tcreate\n" |
| #endif |
| "\tx\t\textract\n" |
| "\tt\t\tlist\n" |
| "\nFile selection:\n" |
| "\tf\t\tname of tarfile or \"-\" for stdin\n" |
| "\tO\t\textract to stdout\n" |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| "\t--exclude\tfile to exclude\n" |
| #endif |
| "\nInformative output:\n" |
| "\tv\t\tverbosely list files processed\n" |
| #endif |
| ; |
| |
| /* Tar file constants */ |
| #ifndef MAJOR |
| #define MAJOR(dev) (((dev)>>8)&0xff) |
| #define MINOR(dev) ((dev)&0xff) |
| #endif |
| |
| |
| /* POSIX tar Header Block, from POSIX 1003.1-1990 */ |
| struct TarHeader |
| { |
| /* byte offset */ |
| char name[100]; /* 0-99 */ |
| char mode[8]; /* 100-107 */ |
| char uid[8]; /* 108-115 */ |
| char gid[8]; /* 116-123 */ |
| char size[12]; /* 124-135 */ |
| char mtime[12]; /* 136-147 */ |
| char chksum[8]; /* 148-155 */ |
| char typeflag; /* 156-156 */ |
| char linkname[100]; /* 157-256 */ |
| char magic[6]; /* 257-262 */ |
| char version[2]; /* 263-264 */ |
| char uname[32]; /* 265-296 */ |
| char gname[32]; /* 297-328 */ |
| char devmajor[8]; /* 329-336 */ |
| char devminor[8]; /* 337-344 */ |
| char prefix[155]; /* 345-499 */ |
| char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */ |
| }; |
| typedef struct TarHeader TarHeader; |
| |
| |
| /* A few useful constants */ |
| #define TAR_MAGIC "ustar" /* ustar and a null */ |
| #define TAR_VERSION " " /* Be compatable with GNU tar format */ |
| #define TAR_MAGIC_LEN 6 |
| #define TAR_VERSION_LEN 2 |
| #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; |
| |
| /* Local procedures to restore files from a tar file. */ |
| static int readTarFile(const char* tarName, int extractFlag, int listFlag, |
| int tostdoutFlag, int verboseFlag, char** excludeList); |
| |
| |
| |
| #ifdef BB_FEATURE_TAR_CREATE |
| /* Local procedures to save files into a tar file. */ |
| static int writeTarFile(const char* tarName, int tostdoutFlag, |
| int verboseFlag, int argc, char **argv, char** excludeList); |
| #endif |
| |
| |
| extern int tar_main(int argc, char **argv) |
| { |
| char** excludeList=NULL; |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| int excludeListSize=0; |
| #endif |
| const char *tarName="-"; |
| int listFlag = FALSE; |
| int extractFlag = FALSE; |
| int createFlag = FALSE; |
| int verboseFlag = FALSE; |
| int tostdoutFlag = FALSE; |
| int stopIt; |
| |
| if (argc <= 1) |
| usage(tar_usage); |
| |
| /* Parse any options */ |
| while (--argc > 0 && strspn(*(++argv), "-cxt") >0 ) { |
| stopIt=FALSE; |
| while (stopIt==FALSE && *argv && **argv) { |
| switch (**argv) { |
| case 'f': |
| if (--argc == 0) { |
| fatalError( "Option requires an argument: No file specified\n"); |
| } |
| if (*tarName != '-') |
| fatalError( "Only one 'f' option allowed\n"); |
| tarName = *(++argv); |
| if (tarName == NULL) |
| fatalError( "Option requires an argument: No file specified\n"); |
| stopIt=TRUE; |
| break; |
| |
| case 't': |
| if (extractFlag == TRUE || createFlag == TRUE) |
| goto flagError; |
| listFlag = TRUE; |
| break; |
| |
| case 'x': |
| if (listFlag == TRUE || createFlag == TRUE) |
| goto flagError; |
| extractFlag = TRUE; |
| break; |
| case 'c': |
| if (extractFlag == TRUE || listFlag == TRUE) |
| goto flagError; |
| createFlag = TRUE; |
| break; |
| |
| case 'v': |
| verboseFlag = TRUE; |
| break; |
| |
| case 'O': |
| tostdoutFlag = TRUE; |
| tarName = "-"; |
| break; |
| case '-': |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| if (strcmp(*argv, "-exclude")==0) { |
| if (--argc == 0) { |
| fatalError( "Option requires an argument: No file specified\n"); |
| } |
| excludeList=realloc( excludeList, sizeof(char**) * (excludeListSize+2)); |
| excludeList[excludeListSize] = *(++argv); |
| /* Remove leading "/"s */ |
| if (*excludeList[excludeListSize] =='/') { |
| excludeList[excludeListSize] = (excludeList[excludeListSize])+1; |
| } |
| if (excludeList[excludeListSize++] == NULL) |
| fatalError( "Option requires an argument: No file specified\n"); |
| /* Tack a NULL onto the end of the list */ |
| excludeList[excludeListSize] = NULL; |
| stopIt=TRUE; |
| break; |
| } |
| #endif |
| break; |
| |
| default: |
| fatalError( "Unknown tar flag '%c'\n" |
| "Try `tar --help' for more information\n", **argv); |
| } |
| ++(*argv); |
| } |
| } |
| |
| /* |
| * Do the correct type of action supplying the rest of the |
| * command line arguments as the list of files to process. |
| */ |
| if (createFlag == TRUE) { |
| #ifndef BB_FEATURE_TAR_CREATE |
| fatalError( "This version of tar was not compiled with tar creation support.\n"); |
| #else |
| exit(writeTarFile(tarName, tostdoutFlag, verboseFlag, argc, argv, excludeList)); |
| #endif |
| } |
| if (listFlag == TRUE || extractFlag == TRUE) { |
| exit(readTarFile(tarName, extractFlag, listFlag, tostdoutFlag, verboseFlag, excludeList)); |
| } |
| |
| flagError: |
| fatalError( "Exactly one of 'c', 'x' or 't' must be specified\n"); |
| } |
| |
| static void |
| fixUpPermissions(TarInfo *header) |
| { |
| struct utimbuf t; |
| /* Now set permissions etc for the new file */ |
| chown(header->name, header->uid, header->gid); |
| chmod(header->name, header->mode); |
| /* Reset the time */ |
| t.actime = time(0); |
| t.modtime = header->mtime; |
| utime(header->name, &t); |
| } |
| |
| static int |
| tarExtractRegularFile(TarInfo *header, int extractFlag, int tostdoutFlag) |
| { |
| size_t writeSize; |
| size_t readSize; |
| size_t actualWriteSz; |
| char buffer[BUFSIZ]; |
| size_t size = header->size; |
| int outFd=fileno(stdout); |
| |
| /* Open the file to be written, if a file is supposed to be written */ |
| if (extractFlag==TRUE && tostdoutFlag==FALSE) { |
| /* Create the path to the file, just in case it isn't there... |
| * This should not screw up path permissions or anything. */ |
| createPath(header->name, 0777); |
| if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, |
| header->mode & ~S_IFMT)) < 0) { |
| errorMsg(io_error, header->name, strerror(errno)); |
| return( FALSE); |
| } |
| } |
| |
| /* Write out the file, if we are supposed to be doing that */ |
| while ( size > 0 ) { |
| actualWriteSz=0; |
| if ( size > sizeof(buffer) ) |
| writeSize = readSize = sizeof(buffer); |
| else { |
| int mod = size % 512; |
| if ( mod != 0 ) |
| readSize = size + (512 - mod); |
| else |
| readSize = size; |
| writeSize = size; |
| } |
| if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) { |
| /* Tarball seems to have a problem */ |
| errorMsg("tar: Unexpected EOF in archive\n"); |
| return( FALSE); |
| } |
| if ( readSize < writeSize ) |
| writeSize = readSize; |
| |
| /* Write out the file, if we are supposed to be doing that */ |
| if (extractFlag==TRUE) { |
| |
| if ((actualWriteSz=fullWrite(outFd, buffer, writeSize)) != writeSize ) { |
| /* Output file seems to have a problem */ |
| errorMsg(io_error, header->name, strerror(errno)); |
| return( 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 (createPath(header->name, header->mode) != TRUE) { |
| errorMsg("tar: %s: Cannot mkdir: %s\n", |
| header->name, strerror(errno)); |
| return( FALSE); |
| } |
| /* make the final component, just in case it was |
| * omitted by createPath() (which will skip the |
| * directory if it doesn't have a terminating '/') */ |
| if (mkdir(header->name, header->mode) == 0) { |
| fixUpPermissions(header); |
| } |
| 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) { |
| errorMsg("tar: %s: Cannot create hard link to '%s': %s\n", |
| header->name, header->linkname, strerror(errno)); |
| 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) { |
| errorMsg("tar: %s: Cannot create symlink to '%s': %s\n", |
| header->name, header->linkname, strerror(errno)); |
| 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 |
| errorMsg("tar: %s: Cannot create symlink to '%s': %s\n", |
| 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) { |
| errorMsg("tar: %s: Cannot mknod: %s\n", |
| header->name, strerror(errno)); |
| return( FALSE); |
| } |
| } else if (S_ISFIFO(header->mode)) { |
| if (mkfifo(header->name, header->mode) < 0) { |
| errorMsg("tar: %s: Cannot mkfifo: %s\n", |
| header->name, strerror(errno)); |
| return( FALSE); |
| } |
| } |
| |
| /* Now set permissions etc for the new directory */ |
| fixUpPermissions(header); |
| return( TRUE); |
| } |
| |
| /* Read an octal value in a field of the specified width, with optional |
| * spaces on both sides of the number and with an optional null character |
| * at the end. Returns -1 on an illegal format. */ |
| static long getOctal(const char *cp, int size) |
| { |
| long val = 0; |
| |
| for(;(size > 0) && (*cp == ' '); cp++, size--); |
| if ((size == 0) || !isOctal(*cp)) |
| return -1; |
| for(; (size > 0) && isOctal(*cp); size--) { |
| val = val * 8 + *cp++ - '0'; |
| } |
| for (;(size > 0) && (*cp == ' '); cp++, size--); |
| if ((size > 0) && *cp) |
| return -1; |
| return val; |
| } |
| |
| |
| /* 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) { |
| errorMsg("tar: Removing leading '/' from member names\n"); |
| alreadyWarned = TRUE; |
| } |
| } |
| |
| header->mode = getOctal(rawHeader->mode, sizeof(rawHeader->mode)); |
| header->uid = getOctal(rawHeader->uid, sizeof(rawHeader->uid)); |
| header->gid = getOctal(rawHeader->gid, sizeof(rawHeader->gid)); |
| header->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 */ |
| 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); |
| } |
| |
| |
| /* |
| * Read a tar file and extract or list the specified files within it. |
| * If the list is empty than all files are extracted or listed. |
| */ |
| static int readTarFile(const char* tarName, int extractFlag, int listFlag, |
| int tostdoutFlag, int verboseFlag, char** excludeList) |
| { |
| int status, tarFd=-1; |
| int errorFlag=FALSE; |
| TarHeader rawHeader; |
| TarInfo header; |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| char** tmpList; |
| #endif |
| |
| /* Open the tar file for reading. */ |
| if (!strcmp(tarName, "-")) |
| tarFd = fileno(stdin); |
| else |
| tarFd = open(tarName, O_RDONLY); |
| if (tarFd < 0) { |
| errorMsg( "Error opening '%s': %s\n", tarName, strerror(errno)); |
| return ( FALSE); |
| } |
| |
| /* Set the umask for this process so it doesn't |
| * screw up permission setting for us later. */ |
| umask(0); |
| |
| /* Read the tar file, and iterate over it one file at a time */ |
| while ( (status = fullRead(tarFd, (char*)&rawHeader, TAR_BLOCK_SIZE)) == TAR_BLOCK_SIZE ) { |
| |
| /* First, try to read the header */ |
| if ( readTarHeader(&rawHeader, &header) == FALSE ) { |
| if ( *(header.name) == '\0' ) { |
| goto endgame; |
| } else { |
| errorFlag=TRUE; |
| errorMsg("Bad tar header, skipping\n"); |
| continue; |
| } |
| } |
| if ( *(header.name) == '\0' ) |
| goto endgame; |
| header.tarFd = tarFd; |
| |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| { |
| int skipFlag=FALSE; |
| /* Check for excluded files.... */ |
| for (tmpList=excludeList; tmpList && *tmpList; tmpList++) { |
| /* Do some extra hoop jumping for when directory names |
| * end in '/' but the entry in tmpList doesn't */ |
| if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || ( |
| header.name[strlen(header.name)-1]=='/' |
| && strncmp( *tmpList, header.name, |
| MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) { |
| /* If it is a regular file, pretend to extract it with |
| * the extractFlag set to FALSE, so the junk in the tarball |
| * is properly skipped over */ |
| if ( header.type==REGTYPE || header.type==REGTYPE0 ) { |
| tarExtractRegularFile(&header, FALSE, FALSE); |
| } |
| skipFlag=TRUE; |
| break; |
| } |
| } |
| /* There are not the droids you're looking for, move along */ |
| if (skipFlag==TRUE) |
| continue; |
| } |
| #endif |
| /* Special treatment if the list (-t) flag is on */ |
| if (verboseFlag == TRUE && extractFlag == FALSE) { |
| int len, len1; |
| char buf[35]; |
| struct tm *tm = localtime (&(header.mtime)); |
| |
| len=printf("%s ", modeString(header.mode)); |
| memset(buf, 0, 8*sizeof(char)); |
| my_getpwuid(buf, header.uid); |
| if (! *buf) |
| len+=printf("%d", header.uid); |
| else |
| len+=printf("%s", buf); |
| memset(buf, 0, 8*sizeof(char)); |
| 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); |
| } |
| } |
| /* List contents if we are supposed to do that */ |
| if (verboseFlag == TRUE || listFlag == TRUE) { |
| /* Now the normal listing */ |
| printf("%s", header.name); |
| } |
| if (verboseFlag == TRUE && listFlag == TRUE) { |
| /* 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); |
| } |
| if (verboseFlag == TRUE || listFlag == TRUE) { |
| printf("\n"); |
| } |
| |
| /* Remove any clutter lying in our way */ |
| unlink( header.name); |
| |
| /* If we got here, we can be certain we have a legitimate |
| * header to work with. So work with it. */ |
| switch ( header.type ) { |
| case REGTYPE: |
| case REGTYPE0: |
| /* If the name ends in a '/' then assume it is |
| * supposed to be a directory, and fall through */ |
| if (header.name[strlen(header.name)-1] != '/') { |
| if (tarExtractRegularFile(&header, extractFlag, tostdoutFlag)==FALSE) |
| errorFlag=TRUE; |
| break; |
| } |
| case DIRTYPE: |
| if (tarExtractDirectory( &header, extractFlag, tostdoutFlag)==FALSE) |
| errorFlag=TRUE; |
| break; |
| case LNKTYPE: |
| if (tarExtractHardLink( &header, extractFlag, tostdoutFlag)==FALSE) |
| errorFlag=TRUE; |
| break; |
| case SYMTYPE: |
| if (tarExtractSymLink( &header, extractFlag, tostdoutFlag)==FALSE) |
| errorFlag=TRUE; |
| break; |
| case CHRTYPE: |
| case BLKTYPE: |
| case FIFOTYPE: |
| if (tarExtractSpecial( &header, extractFlag, tostdoutFlag)==FALSE) |
| errorFlag=TRUE; |
| break; |
| default: |
| close( tarFd); |
| return( FALSE); |
| } |
| } |
| close(tarFd); |
| if (status > 0) { |
| /* Bummer - we read a partial header */ |
| errorMsg( "Error reading '%s': %s\n", tarName, strerror(errno)); |
| return ( FALSE); |
| } |
| else if (errorFlag==TRUE) { |
| errorMsg( "tar: Error exit delayed from previous errors\n"); |
| return( FALSE); |
| } else |
| return( status); |
| |
| /* Stuff to do when we are done */ |
| endgame: |
| close( tarFd); |
| if ( *(header.name) == '\0' ) { |
| if (errorFlag==TRUE) |
| errorMsg( "tar: Error exit delayed from previous errors\n"); |
| else |
| return( TRUE); |
| } |
| return( FALSE); |
| } |
| |
| |
| #ifdef BB_FEATURE_TAR_CREATE |
| |
| /* Some info to be carried along when creating a new tarball */ |
| struct TarBallInfo |
| { |
| char* fileName; /* File name of the tarball */ |
| int tarFd; /* Open-for-write file descriptor |
| for the tarball */ |
| struct stat statBuf; /* Stat info for the tarball, letting |
| us know the inode and device that the |
| tarball lives, so we can avoid trying |
| to include the tarball into itself */ |
| int verboseFlag; /* Whether to print extra stuff or not */ |
| char** excludeList; /* List of files to not include */ |
| }; |
| typedef struct TarBallInfo TarBallInfo; |
| |
| |
| /* Put an octal string into the specified buffer. |
| * The number is zero and space padded and possibly null padded. |
| * Returns TRUE if successful. */ |
| static int putOctal (char *cp, int len, long value) |
| { |
| int tempLength; |
| char tempBuffer[32]; |
| char *tempString = tempBuffer; |
| |
| /* Create a string of the specified length with an initial space, |
| * leading zeroes and the octal number, and a trailing null. */ |
| sprintf (tempString, "%0*lo", len - 1, value); |
| |
| /* If the string is too large, suppress the leading space. */ |
| tempLength = strlen (tempString) + 1; |
| if (tempLength > len) { |
| tempLength--; |
| tempString++; |
| } |
| |
| /* If the string is still too large, suppress the trailing null. */ |
| if (tempLength > len) |
| tempLength--; |
| |
| /* If the string is still too large, fail. */ |
| if (tempLength > len) |
| return FALSE; |
| |
| /* Copy the string to the field. */ |
| memcpy (cp, tempString, len); |
| |
| return TRUE; |
| } |
| |
| /* Write out a tar header for the specified file/directory/whatever */ |
| static int |
| writeTarHeader(struct TarBallInfo *tbInfo, const char *fileName, struct stat *statbuf) |
| { |
| long chksum=0; |
| struct TarHeader header; |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| char** tmpList; |
| #endif |
| const unsigned char *cp = (const unsigned char *) &header; |
| ssize_t size = sizeof(struct TarHeader); |
| |
| memset( &header, 0, size); |
| |
| if (*fileName=='/') { |
| static int alreadyWarned=FALSE; |
| if (alreadyWarned==FALSE) { |
| errorMsg("tar: Removing leading '/' from member names\n"); |
| alreadyWarned=TRUE; |
| } |
| strncpy(header.name, fileName+1, sizeof(header.name)); |
| } |
| else { |
| strncpy(header.name, fileName, sizeof(header.name)); |
| } |
| |
| #if defined BB_FEATURE_TAR_EXCLUDE |
| /* Check for excluded files.... */ |
| for (tmpList=tbInfo->excludeList; tmpList && *tmpList; tmpList++) { |
| /* Do some extra hoop jumping for when directory names |
| * end in '/' but the entry in tmpList doesn't */ |
| if (strncmp( *tmpList, header.name, strlen(*tmpList))==0 || ( |
| header.name[strlen(header.name)-1]=='/' |
| && strncmp( *tmpList, header.name, |
| MIN(strlen(header.name)-1, strlen(*tmpList)))==0)) { |
| /* Set the mode to something that is not a regular file, thereby |
| * faking out writeTarFile into thinking that nothing further need |
| * be done for this file. Yes, I know this is ugly, but it works. */ |
| statbuf->st_mode = 0; |
| return( TRUE); |
| } |
| } |
| #endif |
| |
| putOctal(header.mode, sizeof(header.mode), statbuf->st_mode); |
| putOctal(header.uid, sizeof(header.uid), statbuf->st_uid); |
| putOctal(header.gid, sizeof(header.gid), statbuf->st_gid); |
| putOctal(header.size, sizeof(header.size), 0); /* Regular file size is handled later */ |
| putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime); |
| strncpy(header.magic, TAR_MAGIC TAR_VERSION, |
| TAR_MAGIC_LEN + TAR_VERSION_LEN ); |
| |
| /* Enter the user and group names (default to root if it fails) */ |
| my_getpwuid(header.uname, statbuf->st_uid); |
| if (! *header.uname) |
| strcpy(header.uname, "root"); |
| my_getgrgid(header.gname, statbuf->st_gid); |
| if (! *header.uname) |
| strcpy(header.uname, "root"); |
| |
| /* WARNING/NOTICE: I break Hard Links */ |
| if (S_ISLNK(statbuf->st_mode)) { |
| char buffer[BUFSIZ]; |
| header.typeflag = SYMTYPE; |
| if ( readlink(fileName, buffer, sizeof(buffer) - 1) < 0) { |
| errorMsg("Error reading symlink '%s': %s\n", header.name, strerror(errno)); |
| return ( FALSE); |
| } |
| strncpy(header.linkname, buffer, sizeof(header.linkname)); |
| } else if (S_ISDIR(statbuf->st_mode)) { |
| header.typeflag = DIRTYPE; |
| strncat(header.name, "/", sizeof(header.name)); |
| } else if (S_ISCHR(statbuf->st_mode)) { |
| header.typeflag = CHRTYPE; |
| putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev)); |
| putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev)); |
| } else if (S_ISBLK(statbuf->st_mode)) { |
| header.typeflag = BLKTYPE; |
| putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev)); |
| putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev)); |
| } else if (S_ISFIFO(statbuf->st_mode)) { |
| header.typeflag = FIFOTYPE; |
| } else if (S_ISREG(statbuf->st_mode)) { |
| header.typeflag = REGTYPE; |
| putOctal(header.size, sizeof(header.size), statbuf->st_size); |
| } else { |
| errorMsg("tar: %s: Unknown file type\n", fileName); |
| return ( FALSE); |
| } |
| |
| /* Calculate and store the checksum (i.e. the sum of all of the bytes of |
| * the header). The checksum field must be filled with blanks for the |
| * calculation. The checksum field is formatted differently from the |
| * other fields: it has [6] digits, a null, then a space -- rather than |
| * digits, followed by a null like the other fields... */ |
| memset(header.chksum, ' ', sizeof(header.chksum)); |
| cp = (const unsigned char *) &header; |
| while (size-- > 0) |
| chksum += *cp++; |
| putOctal(header.chksum, 7, chksum); |
| |
| /* Now write the header out to disk */ |
| if ((size=fullWrite(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) { |
| errorMsg(io_error, fileName, strerror(errno)); |
| return ( FALSE); |
| } |
| /* Pad the header up to the tar block size */ |
| for (; size<TAR_BLOCK_SIZE; size++) { |
| write(tbInfo->tarFd, "\0", 1); |
| } |
| /* Now do the verbose thing (or not) */ |
| if (tbInfo->verboseFlag==TRUE) |
| fprintf(stdout, "%s\n", header.name); |
| |
| return ( TRUE); |
| } |
| |
| |
| static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData) |
| { |
| struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData; |
| |
| /* It is against the rules to archive a socket */ |
| if (S_ISSOCK(statbuf->st_mode)) { |
| errorMsg("tar: %s: socket ignored\n", fileName); |
| return( TRUE); |
| } |
| |
| /* It is a bad idea to store the archive we are in the process of creating, |
| * so check the device and inode to be sure that this particular file isn't |
| * the new tarball */ |
| if (tbInfo->statBuf.st_dev == statbuf->st_dev && |
| tbInfo->statBuf.st_ino == statbuf->st_ino) { |
| errorMsg("tar: %s: file is the archive; skipping\n", fileName); |
| return( TRUE); |
| } |
| |
| if (writeTarHeader(tbInfo, fileName, statbuf)==FALSE) { |
| return( FALSE); |
| } |
| |
| /* Now, if the file is a regular file, copy it out to the tarball */ |
| if (S_ISREG(statbuf->st_mode)) { |
| int inputFileFd; |
| char buffer[BUFSIZ]; |
| ssize_t size=0, readSize=0; |
| |
| /* open the file we want to archive, and make sure all is well */ |
| if ((inputFileFd = open(fileName, O_RDONLY)) < 0) { |
| errorMsg("tar: %s: Cannot open: %s\n", fileName, strerror(errno)); |
| return( FALSE); |
| } |
| |
| /* write the file to the archive */ |
| while ( (size = fullRead(inputFileFd, buffer, sizeof(buffer))) > 0 ) { |
| if (fullWrite(tbInfo->tarFd, buffer, size) != size ) { |
| /* Output file seems to have a problem */ |
| errorMsg(io_error, fileName, strerror(errno)); |
| return( FALSE); |
| } |
| readSize+=size; |
| } |
| if (size == -1) { |
| errorMsg(io_error, fileName, strerror(errno)); |
| return( FALSE); |
| } |
| /* Pad the file up to the tar block size */ |
| for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) { |
| write(tbInfo->tarFd, "\0", 1); |
| } |
| close( inputFileFd); |
| } |
| |
| return( TRUE); |
| } |
| |
| static int writeTarFile(const char* tarName, int tostdoutFlag, |
| int verboseFlag, int argc, char **argv, char** excludeList) |
| { |
| int tarFd=-1; |
| int errorFlag=FALSE; |
| ssize_t size; |
| struct TarBallInfo tbInfo; |
| tbInfo.verboseFlag = verboseFlag; |
| |
| /* Make sure there is at least one file to tar up. */ |
| if (argc <= 0) |
| fatalError("tar: Cowardly refusing to create an empty archive\n"); |
| |
| /* Open the tar file for writing. */ |
| if (tostdoutFlag == TRUE) |
| tbInfo.tarFd = fileno(stdout); |
| else |
| tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644); |
| if (tbInfo.tarFd < 0) { |
| errorMsg( "tar: Error opening '%s': %s\n", tarName, strerror(errno)); |
| return ( FALSE); |
| } |
| tbInfo.excludeList=excludeList; |
| /* Store the stat info for the tarball's file, so |
| * can avoid including the tarball into itself.... */ |
| if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0) |
| fatalError(io_error, tarName, strerror(errno)); |
| |
| /* Set the umask for this process so it doesn't |
| * screw up permission setting for us later. */ |
| umask(0); |
| |
| /* Read the directory/files and iterate over them one at a time */ |
| while (argc-- > 0) { |
| if (recursiveAction(*argv++, TRUE, FALSE, FALSE, |
| writeFileToTarball, writeFileToTarball, |
| (void*) &tbInfo) == FALSE) { |
| errorFlag = TRUE; |
| } |
| } |
| /* Write two empty blocks to the end of the archive */ |
| for (size=0; size<(2*TAR_BLOCK_SIZE); size++) { |
| write(tbInfo.tarFd, "\0", 1); |
| } |
| |
| /* To be pedantically correct, we would check if the tarball |
| * is smaller then 20 tar blocks, and pad it if it was smaller, |
| * but that isn't necessary for GNU tar interoperability, and |
| * so is considered a waste of space */ |
| |
| /* Hang up the tools, close up shop, head home */ |
| close(tarFd); |
| if (errorFlag == TRUE) { |
| errorMsg("tar: Error exit delayed from previous errors\n"); |
| return(FALSE); |
| } |
| return( TRUE); |
| } |
| |
| |
| #endif |
| |