From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- release/src/router/busybox/tar.c | 1141 -------------------------------------- 1 file changed, 1141 deletions(-) delete mode 100644 release/src/router/busybox/tar.c (limited to 'release/src/router/busybox/tar.c') diff --git a/release/src/router/busybox/tar.c b/release/src/router/busybox/tar.c deleted file mode 100644 index 50e3b3ef..00000000 --- a/release/src/router/busybox/tar.c +++ /dev/null @@ -1,1141 +0,0 @@ -/* 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 - -- cgit v1.2.3-54-g00ecf