| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini tar implementation for busybox |
| * |
| * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg |
| * by Glenn McGrath |
| * |
| * Note, that as of BusyBox-0.43, tar has been completely rewritten from the |
| * ground up. It still has remnants of the old code lying about, but it is |
| * very different now (i.e., cleaner, less global variables, etc.) |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.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 |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| #include <fnmatch.h> |
| #include "libbb.h" |
| #include "unarchive.h" |
| |
| /* FIXME: Stop using this non-standard feature */ |
| #ifndef FNM_LEADING_DIR |
| #define FNM_LEADING_DIR 0 |
| #endif |
| |
| |
| #define block_buf bb_common_bufsiz1 |
| |
| |
| #if !ENABLE_FEATURE_TAR_GZIP && !ENABLE_FEATURE_TAR_BZIP2 |
| /* Do not pass gzip flag to writeTarFile() */ |
| #define writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude, gzip) \ |
| writeTarFile(tar_fd, verboseFlag, dereferenceFlag, include, exclude) |
| #endif |
| |
| |
| #if ENABLE_FEATURE_TAR_CREATE |
| |
| /* Tar file constants */ |
| |
| #define TAR_BLOCK_SIZE 512 |
| |
| /* POSIX tar Header Block, from POSIX 1003.1-1990 */ |
| #define NAME_SIZE 100 |
| #define NAME_SIZE_STR "100" |
| typedef struct TarHeader TarHeader; |
| 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 */ |
| /* POSIX: "ustar" NUL "00" */ |
| /* GNU tar: "ustar " NUL */ |
| /* Normally it's defined as magic[6] followed by |
| * version[2], but we put them together to save code. |
| */ |
| char magic[8]; /* 257-264 */ |
| 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 TAR_BLOCK_SIZE) */ |
| }; |
| |
| /* |
| ** 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 */ |
| typedef struct TarBallInfo TarBallInfo; |
| struct TarBallInfo { |
| 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 */ |
| const llist_t *excludeList; /* List of files to not include */ |
| HardLinkInfo *hlInfoHead; /* Hard Link Tracking Information */ |
| HardLinkInfo *hlInfo; /* Hard Link Info for the current file */ |
| }; |
| |
| /* A nice enum with all the possible tar file content types */ |
| enum TarFileType { |
| REGTYPE = '0', /* regular file */ |
| REGTYPE0 = '\0', /* regular file (ancient bug compat) */ |
| LNKTYPE = '1', /* hard link */ |
| SYMTYPE = '2', /* symbolic link */ |
| CHRTYPE = '3', /* character special */ |
| BLKTYPE = '4', /* block special */ |
| DIRTYPE = '5', /* directory */ |
| FIFOTYPE = '6', /* FIFO special */ |
| CONTTYPE = '7', /* reserved */ |
| GNULONGLINK = 'K', /* GNU long (>100 chars) link name */ |
| GNULONGNAME = 'L', /* GNU long (>100 chars) file name */ |
| }; |
| typedef enum TarFileType TarFileType; |
| |
| /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ |
| static void addHardLinkInfo(HardLinkInfo **hlInfoHeadPtr, |
| struct stat *statbuf, |
| const char *fileName) |
| { |
| /* Note: hlInfoHeadPtr can never be NULL! */ |
| HardLinkInfo *hlInfo; |
| |
| hlInfo = xmalloc(sizeof(HardLinkInfo) + strlen(fileName)); |
| hlInfo->next = *hlInfoHeadPtr; |
| *hlInfoHeadPtr = hlInfo; |
| hlInfo->dev = statbuf->st_dev; |
| hlInfo->ino = statbuf->st_ino; |
| hlInfo->linkCount = statbuf->st_nlink; |
| strcpy(hlInfo->name, fileName); |
| } |
| |
| static void freeHardLinkInfo(HardLinkInfo **hlInfoHeadPtr) |
| { |
| HardLinkInfo *hlInfo; |
| HardLinkInfo *hlInfoNext; |
| |
| if (hlInfoHeadPtr) { |
| hlInfo = *hlInfoHeadPtr; |
| while (hlInfo) { |
| hlInfoNext = hlInfo->next; |
| free(hlInfo); |
| hlInfo = hlInfoNext; |
| } |
| *hlInfoHeadPtr = NULL; |
| } |
| } |
| |
| /* Might be faster (and bigger) if the dev/ino were stored in numeric order;) */ |
| static HardLinkInfo *findHardLinkInfo(HardLinkInfo *hlInfo, struct stat *statbuf) |
| { |
| while (hlInfo) { |
| if ((statbuf->st_ino == hlInfo->ino) && (statbuf->st_dev == hlInfo->dev)) |
| break; |
| hlInfo = hlInfo->next; |
| } |
| return hlInfo; |
| } |
| |
| /* Put an octal string into the specified buffer. |
| * The number is zero padded and possibly null terminated. |
| * Stores low-order bits only if whole value does not fit. */ |
| static void putOctal(char *cp, int len, off_t value) |
| { |
| char tempBuffer[sizeof(off_t)*3+1]; |
| char *tempString = tempBuffer; |
| int width; |
| |
| width = sprintf(tempBuffer, "%0*"OFF_FMT"o", len, value); |
| tempString += (width - len); |
| |
| /* If string has leading zeroes, we can drop one */ |
| /* and field will have trailing '\0' */ |
| /* (increases chances of compat with other tars) */ |
| if (tempString[0] == '0') |
| tempString++; |
| |
| /* Copy the string to the field */ |
| memcpy(cp, tempString, len); |
| } |
| #define PUT_OCTAL(a, b) putOctal((a), sizeof(a), (b)) |
| |
| static void chksum_and_xwrite(int fd, struct TarHeader* hp) |
| { |
| /* POSIX says that checksum is done on unsigned bytes |
| * (Sun and HP-UX gets it wrong... more details in |
| * GNU tar source) */ |
| const unsigned char *cp; |
| int chksum, size; |
| |
| strcpy(hp->magic, "ustar "); |
| |
| /* 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(hp->chksum, ' ', sizeof(hp->chksum)); |
| cp = (const unsigned char *) hp; |
| chksum = 0; |
| size = sizeof(*hp); |
| do { chksum += *cp++; } while (--size); |
| putOctal(hp->chksum, sizeof(hp->chksum)-1, chksum); |
| |
| /* Now write the header out to disk */ |
| xwrite(fd, hp, sizeof(*hp)); |
| } |
| |
| #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| static void writeLongname(int fd, int type, const char *name, int dir) |
| { |
| static const struct { |
| 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 */ |
| } prefilled = { |
| "0000000", |
| "0000000", |
| "0000000", |
| "00000000000", |
| "00000000000", |
| }; |
| struct TarHeader header; |
| int size; |
| |
| dir = !!dir; /* normalize: 0/1 */ |
| size = strlen(name) + 1 + dir; /* GNU tar uses strlen+1 */ |
| /* + dir: account for possible '/' */ |
| |
| memset(&header, 0, sizeof(header)); |
| strcpy(header.name, "././@LongLink"); |
| memcpy(header.mode, prefilled.mode, sizeof(prefilled)); |
| PUT_OCTAL(header.size, size); |
| header.typeflag = type; |
| chksum_and_xwrite(fd, &header); |
| |
| /* Write filename[/] and pad the block. */ |
| /* dir=0: writes 'name<NUL>', pads */ |
| /* dir=1: writes 'name', writes '/<NUL>', pads */ |
| dir *= 2; |
| xwrite(fd, name, size - dir); |
| xwrite(fd, "/", dir); |
| size = (-size) & (TAR_BLOCK_SIZE-1); |
| memset(&header, 0, size); |
| xwrite(fd, &header, size); |
| } |
| #endif |
| |
| /* Write out a tar header for the specified file/directory/whatever */ |
| void BUG_tar_header_size(void); |
| static int writeTarHeader(struct TarBallInfo *tbInfo, |
| const char *header_name, const char *fileName, struct stat *statbuf) |
| { |
| struct TarHeader header; |
| |
| if (sizeof(header) != 512) |
| BUG_tar_header_size(); |
| |
| memset(&header, 0, sizeof(struct TarHeader)); |
| |
| strncpy(header.name, header_name, sizeof(header.name)); |
| |
| /* POSIX says to mask mode with 07777. */ |
| PUT_OCTAL(header.mode, statbuf->st_mode & 07777); |
| PUT_OCTAL(header.uid, statbuf->st_uid); |
| PUT_OCTAL(header.gid, statbuf->st_gid); |
| memset(header.size, '0', sizeof(header.size)-1); /* Regular file size is handled later */ |
| PUT_OCTAL(header.mtime, statbuf->st_mtime); |
| |
| /* Enter the user and group names */ |
| safe_strncpy(header.uname, get_cached_username(statbuf->st_uid), sizeof(header.uname)); |
| safe_strncpy(header.gname, get_cached_groupname(statbuf->st_gid), sizeof(header.gname)); |
| |
| if (tbInfo->hlInfo) { |
| /* This is a hard link */ |
| header.typeflag = LNKTYPE; |
| strncpy(header.linkname, tbInfo->hlInfo->name, |
| sizeof(header.linkname)); |
| #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| /* Write out long linkname if needed */ |
| if (header.linkname[sizeof(header.linkname)-1]) |
| writeLongname(tbInfo->tarFd, GNULONGLINK, |
| tbInfo->hlInfo->name, 0); |
| #endif |
| } else if (S_ISLNK(statbuf->st_mode)) { |
| char *lpath = xmalloc_readlink_or_warn(fileName); |
| if (!lpath) |
| return FALSE; |
| header.typeflag = SYMTYPE; |
| strncpy(header.linkname, lpath, sizeof(header.linkname)); |
| #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| /* Write out long linkname if needed */ |
| if (header.linkname[sizeof(header.linkname)-1]) |
| writeLongname(tbInfo->tarFd, GNULONGLINK, lpath, 0); |
| #else |
| /* If it is larger than 100 bytes, bail out */ |
| if (header.linkname[sizeof(header.linkname)-1]) { |
| free(lpath); |
| bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
| return FALSE; |
| } |
| #endif |
| free(lpath); |
| } else if (S_ISDIR(statbuf->st_mode)) { |
| header.typeflag = DIRTYPE; |
| /* Append '/' only if there is a space for it */ |
| if (!header.name[sizeof(header.name)-1]) |
| header.name[strlen(header.name)] = '/'; |
| } else if (S_ISCHR(statbuf->st_mode)) { |
| header.typeflag = CHRTYPE; |
| PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
| PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
| } else if (S_ISBLK(statbuf->st_mode)) { |
| header.typeflag = BLKTYPE; |
| PUT_OCTAL(header.devmajor, major(statbuf->st_rdev)); |
| PUT_OCTAL(header.devminor, minor(statbuf->st_rdev)); |
| } else if (S_ISFIFO(statbuf->st_mode)) { |
| header.typeflag = FIFOTYPE; |
| } else if (S_ISREG(statbuf->st_mode)) { |
| if (sizeof(statbuf->st_size) > 4 |
| && statbuf->st_size > (off_t)0777777777777LL |
| ) { |
| bb_error_msg_and_die("cannot store file '%s' " |
| "of size %"OFF_FMT"d, aborting", |
| fileName, statbuf->st_size); |
| } |
| header.typeflag = REGTYPE; |
| PUT_OCTAL(header.size, statbuf->st_size); |
| } else { |
| bb_error_msg("%s: unknown file type", fileName); |
| return FALSE; |
| } |
| |
| #if ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| /* Write out long name if needed */ |
| /* (we, like GNU tar, output long linkname *before* long name) */ |
| if (header.name[sizeof(header.name)-1]) |
| writeLongname(tbInfo->tarFd, GNULONGNAME, |
| header_name, S_ISDIR(statbuf->st_mode)); |
| #endif |
| |
| /* Now write the header out to disk */ |
| chksum_and_xwrite(tbInfo->tarFd, &header); |
| |
| /* Now do the verbose thing (or not) */ |
| if (tbInfo->verboseFlag) { |
| FILE *vbFd = stdout; |
| |
| if (tbInfo->tarFd == STDOUT_FILENO) /* If the archive goes to stdout, verbose to stderr */ |
| vbFd = stderr; |
| /* GNU "tar cvvf" prints "extended" listing a-la "ls -l" */ |
| /* We don't have such excesses here: for us "v" == "vv" */ |
| /* '/' is probably a GNUism */ |
| fprintf(vbFd, "%s%s\n", header_name, |
| S_ISDIR(statbuf->st_mode) ? "/" : ""); |
| } |
| |
| return TRUE; |
| } |
| |
| #if ENABLE_FEATURE_TAR_FROM |
| static int exclude_file(const llist_t *excluded_files, const char *file) |
| { |
| while (excluded_files) { |
| if (excluded_files->data[0] == '/') { |
| if (fnmatch(excluded_files->data, 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->data, p, |
| FNM_PATHNAME | FNM_LEADING_DIR) == 0) |
| return 1; |
| } |
| } |
| excluded_files = excluded_files->link; |
| } |
| |
| return 0; |
| } |
| #else |
| #define exclude_file(excluded_files, file) 0 |
| #endif |
| |
| static int FAST_FUNC writeFileToTarball(const char *fileName, struct stat *statbuf, |
| void *userData, int depth UNUSED_PARAM) |
| { |
| struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; |
| const char *header_name; |
| int inputFileFd = -1; |
| |
| /* Strip leading '/' (must be before memorizing hardlink's name) */ |
| header_name = fileName; |
| while (header_name[0] == '/') { |
| static smallint warned; |
| |
| if (!warned) { |
| bb_error_msg("removing leading '/' from member names"); |
| warned = 1; |
| } |
| header_name++; |
| } |
| |
| if (header_name[0] == '\0') |
| return TRUE; |
| |
| /* It is against the rules to archive a socket */ |
| if (S_ISSOCK(statbuf->st_mode)) { |
| bb_error_msg("%s: socket ignored", fileName); |
| return TRUE; |
| } |
| |
| /* |
| * 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); |
| if (tbInfo->hlInfo == NULL) |
| addHardLinkInfo(&tbInfo->hlInfoHead, statbuf, header_name); |
| } |
| |
| /* 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 |
| ) { |
| bb_error_msg("%s: file is the archive; skipping", fileName); |
| return TRUE; |
| } |
| |
| if (exclude_file(tbInfo->excludeList, header_name)) |
| return SKIP; |
| |
| #if !ENABLE_FEATURE_TAR_GNU_EXTENSIONS |
| if (strlen(header_name) >= NAME_SIZE) { |
| bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); |
| return TRUE; |
| } |
| #endif |
| |
| /* Is this a regular file? */ |
| if (tbInfo->hlInfo == NULL && S_ISREG(statbuf->st_mode)) { |
| /* open the file we want to archive, and make sure all is well */ |
| inputFileFd = open_or_warn(fileName, O_RDONLY); |
| if (inputFileFd < 0) { |
| return FALSE; |
| } |
| } |
| |
| /* Add an entry to the tarball */ |
| if (writeTarHeader(tbInfo, header_name, fileName, statbuf) == FALSE) { |
| return FALSE; |
| } |
| |
| /* If it was a regular file, write out the body */ |
| if (inputFileFd >= 0) { |
| size_t readSize; |
| /* Write the file to the archive. */ |
| /* We record size into header first, */ |
| /* and then write out file. If file shrinks in between, */ |
| /* tar will be corrupted. So we don't allow for that. */ |
| /* NB: GNU tar 1.16 warns and pads with zeroes */ |
| /* or even seeks back and updates header */ |
| bb_copyfd_exact_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
| ////off_t readSize; |
| ////readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); |
| ////if (readSize != statbuf->st_size && readSize >= 0) { |
| //// bb_error_msg_and_die("short read from %s, aborting", fileName); |
| ////} |
| |
| /* Check that file did not grow in between? */ |
| /* if (safe_read(inputFileFd, 1) == 1) warn but continue? */ |
| |
| close(inputFileFd); |
| |
| /* Pad the file up to the tar block size */ |
| /* (a few tricks here in the name of code size) */ |
| readSize = (-(int)statbuf->st_size) & (TAR_BLOCK_SIZE-1); |
| memset(block_buf, 0, readSize); |
| xwrite(tbInfo->tarFd, block_buf, readSize); |
| } |
| |
| return TRUE; |
| } |
| |
| #if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2 |
| #if !(ENABLE_FEATURE_TAR_GZIP && ENABLE_FEATURE_TAR_BZIP2) |
| #define vfork_compressor(tar_fd, gzip) vfork_compressor(tar_fd) |
| #endif |
| /* Don't inline: vfork scares gcc and pessimizes code */ |
| static void NOINLINE vfork_compressor(int tar_fd, int gzip) |
| { |
| pid_t gzipPid; |
| #if ENABLE_FEATURE_TAR_GZIP && ENABLE_FEATURE_TAR_BZIP2 |
| const char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; |
| #elif ENABLE_FEATURE_TAR_GZIP |
| const char *zip_exec = "gzip"; |
| #else /* only ENABLE_FEATURE_TAR_BZIP2 */ |
| const char *zip_exec = "bzip2"; |
| #endif |
| // On Linux, vfork never unpauses parent early, although standard |
| // allows for that. Do we want to waste bytes checking for it? |
| #define WAIT_FOR_CHILD 0 |
| volatile int vfork_exec_errno = 0; |
| struct fd_pair gzipDataPipe; |
| #if WAIT_FOR_CHILD |
| struct fd_pair gzipStatusPipe; |
| xpiped_pair(gzipStatusPipe); |
| #endif |
| xpiped_pair(gzipDataPipe); |
| |
| signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ |
| |
| #if defined(__GNUC__) && __GNUC__ |
| /* Avoid vfork clobbering */ |
| (void) &zip_exec; |
| #endif |
| |
| gzipPid = vfork(); |
| if (gzipPid < 0) |
| bb_perror_msg_and_die("vfork"); |
| |
| if (gzipPid == 0) { |
| /* child */ |
| /* NB: close _first_, then move fds! */ |
| close(gzipDataPipe.wr); |
| #if WAIT_FOR_CHILD |
| close(gzipStatusPipe.rd); |
| /* gzipStatusPipe.wr will close only on exec - |
| * parent waits for this close to happen */ |
| fcntl(gzipStatusPipe.wr, F_SETFD, FD_CLOEXEC); |
| #endif |
| xmove_fd(gzipDataPipe.rd, 0); |
| xmove_fd(tar_fd, 1); |
| /* exec gzip/bzip2 program/applet */ |
| BB_EXECLP(zip_exec, zip_exec, "-f", NULL); |
| vfork_exec_errno = errno; |
| _exit(EXIT_FAILURE); |
| } |
| |
| /* parent */ |
| xmove_fd(gzipDataPipe.wr, tar_fd); |
| close(gzipDataPipe.rd); |
| #if WAIT_FOR_CHILD |
| close(gzipStatusPipe.wr); |
| while (1) { |
| char buf; |
| int n; |
| |
| /* Wait until child execs (or fails to) */ |
| n = full_read(gzipStatusPipe.rd, &buf, 1); |
| if (n < 0 /* && errno == EAGAIN */) |
| continue; /* try it again */ |
| } |
| close(gzipStatusPipe.rd); |
| #endif |
| if (vfork_exec_errno) { |
| errno = vfork_exec_errno; |
| bb_perror_msg_and_die("cannot exec %s", zip_exec); |
| } |
| } |
| #endif /* ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2 */ |
| |
| |
| /* gcc 4.2.1 inlines it, making code bigger */ |
| static NOINLINE int writeTarFile(int tar_fd, int verboseFlag, |
| int dereferenceFlag, const llist_t *include, |
| const llist_t *exclude, int gzip) |
| { |
| int errorFlag = FALSE; |
| struct TarBallInfo tbInfo; |
| |
| tbInfo.hlInfoHead = NULL; |
| |
| fchmod(tar_fd, 0644); |
| tbInfo.tarFd = tar_fd; |
| tbInfo.verboseFlag = verboseFlag; |
| |
| /* Store the stat info for the tarball's file, so |
| * can avoid including the tarball into itself.... */ |
| if (fstat(tbInfo.tarFd, &tbInfo.statBuf) < 0) |
| bb_perror_msg_and_die("cannot stat tar file"); |
| |
| #if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2 |
| if (gzip) |
| vfork_compressor(tbInfo.tarFd, gzip); |
| #endif |
| |
| tbInfo.excludeList = exclude; |
| |
| /* Read the directory/files and iterate over them one at a time */ |
| while (include) { |
| if (!recursive_action(include->data, ACTION_RECURSE | |
| (dereferenceFlag ? ACTION_FOLLOWLINKS : 0), |
| writeFileToTarball, writeFileToTarball, &tbInfo, 0)) |
| { |
| errorFlag = TRUE; |
| } |
| include = include->link; |
| } |
| /* Write two empty blocks to the end of the archive */ |
| memset(block_buf, 0, 2*TAR_BLOCK_SIZE); |
| xwrite(tbInfo.tarFd, block_buf, 2*TAR_BLOCK_SIZE); |
| |
| /* 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 */ |
| |
| /* Close so the child process (if any) will exit */ |
| close(tbInfo.tarFd); |
| |
| /* Hang up the tools, close up shop, head home */ |
| if (ENABLE_FEATURE_CLEAN_UP) |
| freeHardLinkInfo(&tbInfo.hlInfoHead); |
| |
| if (errorFlag) |
| bb_error_msg("error exit delayed from previous errors"); |
| |
| #if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2 |
| if (gzip) { |
| int status; |
| if (safe_waitpid(-1, &status, 0) == -1) |
| bb_perror_msg("waitpid"); |
| else if (!WIFEXITED(status) || WEXITSTATUS(status)) |
| /* gzip was killed or has exited with nonzero! */ |
| errorFlag = TRUE; |
| } |
| #endif |
| return errorFlag; |
| } |
| #else |
| int writeTarFile(int tar_fd, int verboseFlag, |
| int dereferenceFlag, const llist_t *include, |
| const llist_t *exclude, int gzip); |
| #endif /* FEATURE_TAR_CREATE */ |
| |
| #if ENABLE_FEATURE_TAR_FROM |
| static llist_t *append_file_list_to_list(llist_t *list) |
| { |
| FILE *src_stream; |
| char *line; |
| llist_t *newlist = NULL; |
| |
| while (list) { |
| src_stream = xfopen(llist_pop(&list), "r"); |
| while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
| /* kill trailing '/' unless the string is just "/" */ |
| char *cp = last_char_is(line, '/'); |
| if (cp > line) |
| *cp = '\0'; |
| llist_add_to(&newlist, line); |
| } |
| fclose(src_stream); |
| } |
| return newlist; |
| } |
| #else |
| #define append_file_list_to_list(x) 0 |
| #endif |
| |
| #if ENABLE_FEATURE_TAR_COMPRESS |
| static char FAST_FUNC get_header_tar_Z(archive_handle_t *archive_handle) |
| { |
| /* Can't lseek over pipes */ |
| archive_handle->seek = seek_by_read; |
| |
| /* do the decompression, and cleanup */ |
| if (xread_char(archive_handle->src_fd) != 0x1f |
| || xread_char(archive_handle->src_fd) != 0x9d |
| ) { |
| bb_error_msg_and_die("invalid magic"); |
| } |
| |
| open_transformer(archive_handle->src_fd, uncompress, "uncompress"); |
| archive_handle->offset = 0; |
| while (get_header_tar(archive_handle) == EXIT_SUCCESS) |
| continue; |
| |
| /* Can only do one file at a time */ |
| return EXIT_FAILURE; |
| } |
| #else |
| #define get_header_tar_Z NULL |
| #endif |
| |
| #ifdef CHECK_FOR_CHILD_EXITCODE |
| /* Looks like it isn't needed - tar detects malformed (truncated) |
| * archive if e.g. bunzip2 fails */ |
| static int child_error; |
| |
| static void handle_SIGCHLD(int status) |
| { |
| /* Actually, 'status' is a signo. We reuse it for other needs */ |
| |
| /* Wait for any child without blocking */ |
| if (wait_any_nohang(&status) < 0) |
| /* wait failed?! I'm confused... */ |
| return; |
| |
| if (WIFEXITED(status) && WEXITSTATUS(status)==0) |
| /* child exited with 0 */ |
| return; |
| /* Cannot happen? |
| if (!WIFSIGNALED(status) && !WIFEXITED(status)) return; */ |
| child_error = 1; |
| } |
| #endif |
| |
| enum { |
| OPTBIT_KEEP_OLD = 7, |
| USE_FEATURE_TAR_CREATE( OPTBIT_CREATE ,) |
| USE_FEATURE_TAR_CREATE( OPTBIT_DEREFERENCE ,) |
| USE_FEATURE_TAR_BZIP2( OPTBIT_BZIP2 ,) |
| USE_FEATURE_TAR_LZMA( OPTBIT_LZMA ,) |
| USE_FEATURE_TAR_FROM( OPTBIT_INCLUDE_FROM,) |
| USE_FEATURE_TAR_FROM( OPTBIT_EXCLUDE_FROM,) |
| USE_FEATURE_TAR_GZIP( OPTBIT_GZIP ,) |
| USE_FEATURE_TAR_COMPRESS(OPTBIT_COMPRESS ,) |
| OPTBIT_NOPRESERVE_OWN, |
| OPTBIT_NOPRESERVE_PERM, |
| OPT_TEST = 1 << 0, // t |
| OPT_EXTRACT = 1 << 1, // x |
| OPT_BASEDIR = 1 << 2, // C |
| OPT_TARNAME = 1 << 3, // f |
| OPT_2STDOUT = 1 << 4, // O |
| OPT_P = 1 << 5, // p |
| OPT_VERBOSE = 1 << 6, // v |
| OPT_KEEP_OLD = 1 << 7, // k |
| OPT_CREATE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_CREATE )) + 0, // c |
| OPT_DEREFERENCE = USE_FEATURE_TAR_CREATE( (1<<OPTBIT_DEREFERENCE )) + 0, // h |
| OPT_BZIP2 = USE_FEATURE_TAR_BZIP2( (1<<OPTBIT_BZIP2 )) + 0, // j |
| OPT_LZMA = USE_FEATURE_TAR_LZMA( (1<<OPTBIT_LZMA )) + 0, // a |
| OPT_INCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_INCLUDE_FROM)) + 0, // T |
| OPT_EXCLUDE_FROM = USE_FEATURE_TAR_FROM( (1<<OPTBIT_EXCLUDE_FROM)) + 0, // X |
| OPT_GZIP = USE_FEATURE_TAR_GZIP( (1<<OPTBIT_GZIP )) + 0, // z |
| OPT_COMPRESS = USE_FEATURE_TAR_COMPRESS((1<<OPTBIT_COMPRESS )) + 0, // Z |
| OPT_NOPRESERVE_OWN = 1 << OPTBIT_NOPRESERVE_OWN , // no-same-owner |
| OPT_NOPRESERVE_PERM = 1 << OPTBIT_NOPRESERVE_PERM, // no-same-permissions |
| }; |
| #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
| static const char tar_longopts[] ALIGN1 = |
| "list\0" No_argument "t" |
| "extract\0" No_argument "x" |
| "directory\0" Required_argument "C" |
| "file\0" Required_argument "f" |
| "to-stdout\0" No_argument "O" |
| "same-permissions\0" No_argument "p" |
| "verbose\0" No_argument "v" |
| "keep-old\0" No_argument "k" |
| # if ENABLE_FEATURE_TAR_CREATE |
| "create\0" No_argument "c" |
| "dereference\0" No_argument "h" |
| # endif |
| # if ENABLE_FEATURE_TAR_BZIP2 |
| "bzip2\0" No_argument "j" |
| # endif |
| # if ENABLE_FEATURE_TAR_LZMA |
| "lzma\0" No_argument "a" |
| # endif |
| # if ENABLE_FEATURE_TAR_FROM |
| "files-from\0" Required_argument "T" |
| "exclude-from\0" Required_argument "X" |
| # endif |
| # if ENABLE_FEATURE_TAR_GZIP |
| "gzip\0" No_argument "z" |
| # endif |
| # if ENABLE_FEATURE_TAR_COMPRESS |
| "compress\0" No_argument "Z" |
| # endif |
| "no-same-owner\0" No_argument "\xfd" |
| "no-same-permissions\0" No_argument "\xfe" |
| /* --exclude takes next bit position in option mask, */ |
| /* therefore we have to either put it _after_ --no-same-perm */ |
| /* or add OPT[BIT]_EXCLUDE before OPT[BIT]_NOPRESERVE_OWN */ |
| # if ENABLE_FEATURE_TAR_FROM |
| "exclude\0" Required_argument "\xff" |
| # endif |
| ; |
| #endif |
| |
| int tar_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int tar_main(int argc UNUSED_PARAM, char **argv) |
| { |
| char FAST_FUNC (*get_header_ptr)(archive_handle_t *) = get_header_tar; |
| archive_handle_t *tar_handle; |
| char *base_dir = NULL; |
| const char *tar_filename = "-"; |
| unsigned opt; |
| int verboseFlag = 0; |
| #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
| llist_t *excludes = NULL; |
| #endif |
| |
| /* Initialise default values */ |
| tar_handle = init_handle(); |
| tar_handle->ah_flags = ARCHIVE_CREATE_LEADING_DIRS |
| | ARCHIVE_PRESERVE_DATE |
| | ARCHIVE_EXTRACT_UNCONDITIONAL; |
| |
| /* Prepend '-' to the first argument if required */ |
| opt_complementary = "--:" // first arg is options |
| "tt:vv:" // count -t,-v |
| "?:" // bail out with usage instead of error return |
| "X::T::" // cumulative lists |
| #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
| "\xff::" // cumulative lists for --exclude |
| #endif |
| USE_FEATURE_TAR_CREATE("c:") "t:x:" // at least one of these is reqd |
| USE_FEATURE_TAR_CREATE("c--tx:t--cx:x--ct") // mutually exclusive |
| SKIP_FEATURE_TAR_CREATE("t--x:x--t"); // mutually exclusive |
| #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
| applet_long_options = tar_longopts; |
| #endif |
| opt = getopt32(argv, |
| "txC:f:Opvk" |
| USE_FEATURE_TAR_CREATE( "ch" ) |
| USE_FEATURE_TAR_BZIP2( "j" ) |
| USE_FEATURE_TAR_LZMA( "a" ) |
| USE_FEATURE_TAR_FROM( "T:X:") |
| USE_FEATURE_TAR_GZIP( "z" ) |
| USE_FEATURE_TAR_COMPRESS("Z" ) |
| , &base_dir // -C dir |
| , &tar_filename // -f filename |
| USE_FEATURE_TAR_FROM(, &(tar_handle->accept)) // T |
| USE_FEATURE_TAR_FROM(, &(tar_handle->reject)) // X |
| #if ENABLE_FEATURE_TAR_LONG_OPTIONS && ENABLE_FEATURE_TAR_FROM |
| , &excludes // --exclude |
| #endif |
| , &verboseFlag // combined count for -t and -v |
| , &verboseFlag // combined count for -t and -v |
| ); |
| argv += optind; |
| |
| if (verboseFlag) tar_handle->action_header = header_verbose_list; |
| if (verboseFlag == 1) tar_handle->action_header = header_list; |
| |
| if (opt & OPT_EXTRACT) |
| tar_handle->action_data = data_extract_all; |
| |
| if (opt & OPT_2STDOUT) |
| tar_handle->action_data = data_extract_to_stdout; |
| |
| if (opt & OPT_KEEP_OLD) |
| tar_handle->ah_flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL; |
| |
| if (opt & OPT_NOPRESERVE_OWN) |
| tar_handle->ah_flags |= ARCHIVE_NOPRESERVE_OWN; |
| |
| if (opt & OPT_NOPRESERVE_PERM) |
| tar_handle->ah_flags |= ARCHIVE_NOPRESERVE_PERM; |
| |
| if (opt & OPT_GZIP) |
| get_header_ptr = get_header_tar_gz; |
| |
| if (opt & OPT_BZIP2) |
| get_header_ptr = get_header_tar_bz2; |
| |
| if (opt & OPT_LZMA) |
| get_header_ptr = get_header_tar_lzma; |
| |
| if (opt & OPT_COMPRESS) |
| get_header_ptr = get_header_tar_Z; |
| |
| #if ENABLE_FEATURE_TAR_FROM |
| tar_handle->reject = append_file_list_to_list(tar_handle->reject); |
| #if ENABLE_FEATURE_TAR_LONG_OPTIONS |
| /* Append excludes to reject */ |
| while (excludes) { |
| llist_t *next = excludes->link; |
| excludes->link = tar_handle->reject; |
| tar_handle->reject = excludes; |
| excludes = next; |
| } |
| #endif |
| tar_handle->accept = append_file_list_to_list(tar_handle->accept); |
| #endif |
| |
| /* Setup an array of filenames to work with */ |
| /* TODO: This is the same as in ar, separate function ? */ |
| while (*argv) { |
| /* kill trailing '/' unless the string is just "/" */ |
| char *cp = last_char_is(*argv, '/'); |
| if (cp > *argv) |
| *cp = '\0'; |
| llist_add_to_end(&tar_handle->accept, *argv); |
| argv++; |
| } |
| |
| if (tar_handle->accept || tar_handle->reject) |
| tar_handle->filter = filter_accept_reject_list; |
| |
| /* Open the tar file */ |
| { |
| FILE *tar_stream; |
| int flags; |
| |
| if (opt & OPT_CREATE) { |
| /* Make sure there is at least one file to tar up. */ |
| if (tar_handle->accept == NULL) |
| bb_error_msg_and_die("empty archive"); |
| |
| tar_stream = stdout; |
| /* Mimicking GNU tar 1.15.1: */ |
| flags = O_WRONLY|O_CREAT|O_TRUNC; |
| /* was doing unlink; open(O_WRONLY|O_CREAT|O_EXCL); why? */ |
| } else { |
| tar_stream = stdin; |
| flags = O_RDONLY; |
| } |
| |
| if (LONE_DASH(tar_filename)) { |
| tar_handle->src_fd = fileno(tar_stream); |
| tar_handle->seek = seek_by_read; |
| } else { |
| tar_handle->src_fd = xopen(tar_filename, flags); |
| } |
| } |
| |
| if (base_dir) |
| xchdir(base_dir); |
| |
| #ifdef CHECK_FOR_CHILD_EXITCODE |
| /* We need to know whether child (gzip/bzip/etc) exits abnormally */ |
| signal(SIGCHLD, handle_SIGCHLD); |
| #endif |
| |
| /* create an archive */ |
| if (opt & OPT_CREATE) { |
| #if ENABLE_FEATURE_TAR_GZIP || ENABLE_FEATURE_TAR_BZIP2 |
| int zipMode = 0; |
| if (ENABLE_FEATURE_TAR_GZIP && (opt & OPT_GZIP)) |
| zipMode = 1; |
| if (ENABLE_FEATURE_TAR_BZIP2 && (opt & OPT_BZIP2)) |
| zipMode = 2; |
| #endif |
| /* NB: writeTarFile() closes tar_handle->src_fd */ |
| return writeTarFile(tar_handle->src_fd, verboseFlag, opt & OPT_DEREFERENCE, |
| tar_handle->accept, |
| tar_handle->reject, zipMode); |
| } |
| |
| while (get_header_ptr(tar_handle) == EXIT_SUCCESS) |
| continue; |
| |
| /* Check that every file that should have been extracted was */ |
| while (tar_handle->accept) { |
| if (!find_list_entry(tar_handle->reject, tar_handle->accept->data) |
| && !find_list_entry(tar_handle->passed, tar_handle->accept->data) |
| ) { |
| bb_error_msg_and_die("%s: not found in archive", |
| tar_handle->accept->data); |
| } |
| tar_handle->accept = tar_handle->accept->link; |
| } |
| if (ENABLE_FEATURE_CLEAN_UP /* && tar_handle->src_fd != STDIN_FILENO */) |
| close(tar_handle->src_fd); |
| |
| return EXIT_SUCCESS; |
| } |