/* 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) 1999,2000,2001 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include "busybox.h" /* Tar file constants */ #ifndef MAJOR #define MAJOR(dev) (((dev)>>8)&0xff) #define MINOR(dev) ((dev)&0xff) #endif enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */ /* POSIX tar Header Block, from POSIX 1003.1-1990 */ struct TarHeader { /* byte offset */ char name[NAME_SIZE]; /* 0-99 */ char mode[8]; /* 100-107 */ char uid[8]; /* 108-115 */ char gid[8]; /* 116-123 */ char size[12]; /* 124-135 */ char mtime[12]; /* 136-147 */ char chksum[8]; /* 148-155 */ char typeflag; /* 156-156 */ char linkname[NAME_SIZE]; /* 157-256 */ char magic[6]; /* 257-262 */ char version[2]; /* 263-264 */ char uname[32]; /* 265-296 */ char gname[32]; /* 297-328 */ char devmajor[8]; /* 329-336 */ char devminor[8]; /* 337-344 */ char prefix[155]; /* 345-499 */ char padding[12]; /* 500-512 (pad to exactly the TAR_BLOCK_SIZE) */ }; typedef struct TarHeader TarHeader; /* 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 *dir = dirname (header->name); make_directory (dir, -1, FILEUTILS_RECUR); free (dir); 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; 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. ** Even these functions use the xxxHardLinkInfo() functions. */ typedef struct HardLinkInfo HardLinkInfo; struct HardLinkInfo { HardLinkInfo *next; /* Next entry in list */ dev_t dev; /* Device number */ ino_t ino; /* Inode number */ short linkCount; /* (Hard) Link Count */ char name[1]; /* Start of filename (must be last) */ }; /* Some info to be carried along when creating a new tarball */ struct TarBallInfo { char* fileName; /* File name of the tarball */ int tarFd; /* Open-for-write file descriptor for the tarball */ struct stat statBuf; /* Stat info for the tarball, letting us know the inode and device that the tarball lives, so we can avoid trying to include the tarball into itself */ int verboseFlag; /* Whether to print extra stuff or not */ char** excludeList; /* List of files to not include */ HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */ HardLinkInfo *hlInfo; /* Hard Link Info for the current file */ }; typedef struct TarBallInfo TarBallInfo; /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ static void addHardLinkInfo (HardLinkInfo **hlInfoHeadPtr, dev_t dev, ino_t ino, short linkCount, const char *name) { /* Note: hlInfoHeadPtr can never be NULL! */ HardLinkInfo *hlInfo; hlInfo = (HardLinkInfo *)xmalloc(sizeof(HardLinkInfo)+strlen(name)+1); if (hlInfo) { hlInfo->next = *hlInfoHeadPtr; *hlInfoHeadPtr = hlInfo; hlInfo->dev = dev; hlInfo->ino = ino; hlInfo->linkCount = linkCount; strcpy(hlInfo->name, name); } return; } static void freeHardLinkInfo (HardLinkInfo **hlInfoHeadPtr) { HardLinkInfo *hlInfo = NULL; HardLinkInfo *hlInfoNext = NULL; if (hlInfoHeadPtr) { hlInfo = *hlInfoHeadPtr; while (hlInfo) { hlInfoNext = hlInfo->next; free(hlInfo); hlInfo = hlInfoNext; } *hlInfoHeadPtr = NULL; } return; } /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ static HardLinkInfo * findHardLinkInfo (HardLinkInfo *hlInfo, dev_t dev, ino_t ino) { while(hlInfo) { if ((ino == hlInfo->ino) && (dev == hlInfo->dev)) break; hlInfo = hlInfo->next; } return(hlInfo); } /* 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 *header_name, const char *real_name, struct stat *statbuf) { long chksum=0; struct TarHeader header; const unsigned char *cp = (const unsigned char *) &header; ssize_t size = sizeof(struct TarHeader); memset( &header, 0, size); strncpy(header.name, header_name, sizeof(header.name)); 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"); if (tbInfo->hlInfo) { /* This is a hard link */ header.typeflag = LNKTYPE; strncpy(header.linkname, tbInfo->hlInfo->name, sizeof(header.linkname)); } else if (S_ISLNK(statbuf->st_mode)) { char *lpath = xreadlink(real_name); if (!lpath) /* Already printed err msg inside xreadlink() */ return ( FALSE); header.typeflag = SYMTYPE; strncpy(header.linkname, lpath, sizeof(header.linkname)); free(lpath); } else if (S_ISDIR(statbuf->st_mode)) { header.typeflag = DIRTYPE; strncat(header.name, "/", sizeof(header.name)); } else if (S_ISCHR(statbuf->st_mode)) { header.typeflag = CHRTYPE; putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev)); putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev)); } else if (S_ISBLK(statbuf->st_mode)) { header.typeflag = BLKTYPE; putOctal(header.devmajor, sizeof(header.devmajor), MAJOR(statbuf->st_rdev)); putOctal(header.devminor, sizeof(header.devminor), MINOR(statbuf->st_rdev)); } else if (S_ISFIFO(statbuf->st_mode)) { header.typeflag = FIFOTYPE; } else if (S_ISREG(statbuf->st_mode)) { header.typeflag = REGTYPE; putOctal(header.size, sizeof(header.size), statbuf->st_size); } else { error_msg("%s: Unknown file type", real_name); return ( FALSE); } /* Calculate and store the checksum (i.e., the sum of all of the bytes of * the header). The checksum field must be filled with blanks for the * calculation. The checksum field is formatted differently from the * other fields: it has [6] digits, a null, then a space -- rather than * digits, followed by a null like the other fields... */ memset(header.chksum, ' ', sizeof(header.chksum)); cp = (const unsigned char *) &header; while (size-- > 0) chksum += *cp++; putOctal(header.chksum, 7, chksum); /* Now write the header out to disk */ if ((size=full_write(tbInfo->tarFd, (char*)&header, sizeof(struct TarHeader))) < 0) { error_msg(io_error, real_name, strerror(errno)); return ( FALSE); } /* Pad the header up to the tar block size */ for (; sizetarFd, "\0", 1); } /* Now do the verbose thing (or not) */ if (tbInfo->verboseFlag==TRUE) { FILE *vbFd = stdout; if (tbInfo->tarFd == fileno(stdout)) // If the archive goes to stdout, verbose to stderr vbFd = stderr; fprintf(vbFd, "%s\n", header.name); } return ( TRUE); } static int writeFileToTarball(const char *fileName, struct stat *statbuf, void* userData) { struct TarBallInfo *tbInfo = (struct TarBallInfo *)userData; const char *header_name; /* ** Check to see if we are dealing with a hard link. ** If so - ** Treat the first occurance of a given dev/inode as a file while ** treating any additional occurances as hard links. This is done ** by adding the file information to the HardLinkInfo linked list. */ tbInfo->hlInfo = NULL; if (statbuf->st_nlink > 1) { tbInfo->hlInfo = findHardLinkInfo(tbInfo->hlInfoHead, statbuf->st_dev, statbuf->st_ino); if (tbInfo->hlInfo == NULL) addHardLinkInfo (&tbInfo->hlInfoHead, statbuf->st_dev, statbuf->st_ino, statbuf->st_nlink, fileName); } /* It is against the rules to archive a socket */ if (S_ISSOCK(statbuf->st_mode)) { error_msg("%s: socket ignored", fileName); return( TRUE); } /* It is a bad idea to store the archive we are in the process of creating, * so check the device and inode to be sure that this particular file isn't * the new tarball */ if (tbInfo->statBuf.st_dev == statbuf->st_dev && tbInfo->statBuf.st_ino == statbuf->st_ino) { error_msg("%s: file is the archive; skipping", fileName); return( TRUE); } header_name = fileName; while (header_name[0] == '/') { static int alreadyWarned=FALSE; if (alreadyWarned==FALSE) { error_msg("Removing leading '/' from member names"); alreadyWarned=TRUE; } header_name++; } if (strlen(fileName) >= NAME_SIZE) { error_msg(name_longer_than_foo, NAME_SIZE); return ( TRUE); } if (header_name[0] == '\0') return TRUE; #if defined BB_FEATURE_TAR_EXCLUDE if (exclude_file(tbInfo->excludeList, header_name)) { return SKIP; } #endif if (writeTarHeader(tbInfo, header_name, fileName, statbuf)==FALSE) { return( FALSE); } /* Now, if the file is a regular file, copy it out to the tarball */ if ((tbInfo->hlInfo == NULL) && (S_ISREG(statbuf->st_mode))) { int inputFileFd; char buffer[BUFSIZ]; ssize_t size=0, readSize=0; /* open the file we want to archive, and make sure all is well */ if ((inputFileFd = open(fileName, O_RDONLY)) < 0) { error_msg("%s: Cannot open: %s", fileName, strerror(errno)); return( FALSE); } /* write the file to the archive */ while ( (size = full_read(inputFileFd, buffer, sizeof(buffer))) > 0 ) { if (full_write(tbInfo->tarFd, buffer, size) != size ) { /* Output file seems to have a problem */ error_msg(io_error, fileName, strerror(errno)); return( FALSE); } readSize+=size; } if (size == -1) { error_msg(io_error, fileName, strerror(errno)); return( FALSE); } /* Pad the file up to the tar block size */ for (; (readSize%TAR_BLOCK_SIZE) != 0; readSize++) { write(tbInfo->tarFd, "\0", 1); } close( inputFileFd); } return( TRUE); } static int writeTarFile(const char* tarName, int verboseFlag, char **argv, char** excludeList) { int tarFd=-1; int errorFlag=FALSE; ssize_t size; struct TarBallInfo tbInfo; tbInfo.verboseFlag = verboseFlag; tbInfo.hlInfoHead = NULL; /* Make sure there is at least one file to tar up. */ if (*argv == NULL) error_msg_and_die("Cowardly refusing to create an empty archive"); /* Open the tar file for writing. */ if (!strcmp(tarName, "-")) tbInfo.tarFd = fileno(stdout); else tbInfo.tarFd = open (tarName, O_WRONLY | O_CREAT | O_TRUNC, 0644); if (tbInfo.tarFd < 0) { perror_msg( "Error opening '%s'", tarName); freeHardLinkInfo(&tbInfo.hlInfoHead); return ( FALSE); } tbInfo.excludeList=excludeList; /* Store the stat info for the tarball's file, so * can avoid including the tarball into itself.... */ if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0) error_msg_and_die(io_error, tarName, strerror(errno)); /* Read the directory/files and iterate over them one at a time */ while (*argv != NULL) { if (recursive_action(*argv++, TRUE, FALSE, FALSE, writeFileToTarball, writeFileToTarball, (void*) &tbInfo) == FALSE) { errorFlag = TRUE; } } /* Write two empty blocks to the end of the archive */ for (size=0; size<(2*TAR_BLOCK_SIZE); size++) { write(tbInfo.tarFd, "\0", 1); } /* To be pedantically correct, we would check if the tarball * is smaller than 20 tar blocks, and pad it if it was smaller, * but that isn't necessary for GNU tar interoperability, and * so is considered a waste of space */ /* Hang up the tools, close up shop, head home */ close(tarFd); if (errorFlag == TRUE) { error_msg("Error exit delayed from previous errors"); freeHardLinkInfo(&tbInfo.hlInfoHead); return(FALSE); } freeHardLinkInfo(&tbInfo.hlInfoHead); return( TRUE); } #endif