/* 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 , * * 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 #include #include #include #include #include #include #include #include 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) { if ((outFd=open(header->name, O_CREAT|O_TRUNC|O_WRONLY, header->mode & ~S_IFMT)) < 0) errorMsg(io_error, header->name, strerror(errno)); /* Create the path to the file, just in case it isn't there... * This should not screw up path permissions or anything. */ createPath(header->name, 0777); } /* Write out the file, if we are supposed to be doing that */ while ( size > 0 ) { actualWriteSz=0; if ( size > sizeof(buffer) ) writeSize = readSize = sizeof(buffer); else { int mod = size % 512; if ( mod != 0 ) readSize = size + (512 - mod); else readSize = size; writeSize = size; } if ( (readSize = fullRead(header->tarFd, buffer, readSize)) <= 0 ) { /* Tarball seems to have a problem */ errorMsg("tar: Unexpected EOF in archive\n"); return( 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 (; sizetarFd, "\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