/* vi: set sw=4 ts=4: */ /* * Mini tar implementation for busybox * * Modified to use common extraction code used by ar, cpio, dpkg-deb, dpkg * 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 * * 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 "busybox.h" #include "unarchive.h" #include #include #ifdef CONFIG_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" 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; /* ** 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 { 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 */ }; typedef struct TarBallInfo TarBallInfo; /* 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; } return; } /* 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. * Returns TRUE if successful. - DISABLED (no caller ever checked) */ static void putOctal(char *cp, int len, long long value) { int tempLength; /* long long for the sake of storing lengths of 4Gb+ files */ /* (we are bust anyway after 64Gb: it doesn't fit into the field) */ char tempBuffer[sizeof(long long)*3+1]; char *tempString = tempBuffer; /* Create a string of the specified length with * leading zeroes and the octal number, and a trailing null. */ tempLength = sprintf(tempBuffer, "%0*llo", len - 1, value); /* If the string is too large, suppress leading 0's. */ /* If that is not enough, drop trailing null. */ tempLength -= len; /* easier to do checks */ while (tempLength >= 0) { if (tempString[0] != '0') { if (!tempLength) { /* 1234 barely fits in 4 chars (w/o EOL '\0') */ break; } /* 12345 doesn't fit into 4 chars */ return /*FALSE*/; } tempLength--; /* still have leading '0', */ tempString++; /* can afford to drop it but retain EOL '\0' */ } /* Copy the string to the field. */ memcpy(cp, tempString, len); /*return TRUE;*/ } /* 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; const unsigned char *cp; int chksum; int size; if (sizeof(header) != 512) BUG_tar_header_size(); bzero(&header, sizeof(struct TarHeader)); safe_strncpy(header.name, header_name, sizeof(header.name)); /* POSIX says to mask mode with 07777. */ putOctal(header.mode, sizeof(header.mode), statbuf->st_mode & 07777); putOctal(header.uid, sizeof(header.uid), statbuf->st_uid); putOctal(header.gid, sizeof(header.gid), statbuf->st_gid); if (sizeof(header.size) != sizeof("00000000000")) BUG_tar_header_size(); strcpy(header.size, "00000000000"); /* Regular file size is handled later */ putOctal(header.mtime, sizeof(header.mtime), statbuf->st_mtime); strcpy(header.magic, "ustar "); /* 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)); } else if (S_ISLNK(statbuf->st_mode)) { char *lpath = xreadlink(fileName); if (!lpath) /* Already printed err msg inside xreadlink() */ return FALSE; header.typeflag = SYMTYPE; strncpy(header.linkname, lpath, sizeof(header.linkname)); /* If it is larger than 100 bytes, bail out */ if (header.linkname[sizeof(header.linkname)-1] /* at least 100? */ && lpath[sizeof(header.linkname)] /* and 101th is also not zero */ ) { free(lpath); bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); return FALSE; } 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 { bb_error_msg("%s: unknown file type", fileName); return FALSE; } /* Calculate and store the checksum (i.e., the sum of all of the bytes of * the header). The checksum field must be filled with blanks for the * calculation. The checksum field is formatted differently from the * other fields: it has [6] digits, a null, then a space -- rather than * digits, followed by a null like the other fields... */ memset(header.chksum, ' ', sizeof(header.chksum)); cp = (const unsigned char *) &header; chksum = 0; size = sizeof(struct TarHeader); do { chksum += *cp++; } while (--size); putOctal(header.chksum, sizeof(header.chksum)-1, chksum); /* Now write the header out to disk */ xwrite(tbInfo->tarFd, &header, sizeof(struct TarHeader)); /* 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; fprintf(vbFd, "%s\n", header.name); } return TRUE; } # ifdef CONFIG_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 writeFileToTarball(const char *fileName, struct stat *statbuf, void *userData, int depth) { struct TarBallInfo *tbInfo = (struct TarBallInfo *) userData; const char *header_name; int inputFileFd = -1; /* * 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, fileName); } /* It is against the rules to archive a socket */ if (S_ISSOCK(statbuf->st_mode)) { bb_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) { bb_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) { bb_error_msg("removing leading '/' from member names"); alreadyWarned = TRUE; } header_name++; } if (strlen(fileName) >= NAME_SIZE) { bb_error_msg("names longer than "NAME_SIZE_STR" chars not supported"); return TRUE; } if (header_name[0] == '\0') return TRUE; if (exclude_file(tbInfo->excludeList, header_name)) return SKIP; /* 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(fileName, O_RDONLY); if (inputFileFd < 0) { bb_perror_msg("%s: cannot open", fileName); 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) { off_t readSize = 0; /* write the file to the archive */ readSize = bb_copyfd_size(inputFileFd, tbInfo->tarFd, statbuf->st_size); if (readSize != statbuf->st_size) { /* Deadly. We record size into header first, */ /* and then write out file. If file shrinks in between, */ /* tar will be corrupted. So bail out. */ /* NB: GNU tar 1.16 warns and pads with zeroes */ /* or even seeks back and updates header */ bb_error_msg_and_die("short read from %s", 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)readSize) & (TAR_BLOCK_SIZE-1); bzero(bb_common_bufsiz1, readSize); xwrite(tbInfo->tarFd, bb_common_bufsiz1, readSize); } return TRUE; } static int writeTarFile(const int tar_fd, const int verboseFlag, const unsigned long dereferenceFlag, const llist_t *include, const llist_t *exclude, const int gzip) { pid_t gzipPid = 0; 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) && gzip) { int gzipDataPipe[2] = { -1, -1 }; int gzipStatusPipe[2] = { -1, -1 }; volatile int vfork_exec_errno = 0; char *zip_exec = (gzip == 1) ? "gzip" : "bzip2"; if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0) bb_perror_msg_and_die("pipe"); signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ # if __GNUC__ /* Avoid vfork clobbering */ (void) &include; (void) &errorFlag; (void) &zip_exec; # endif gzipPid = vfork(); if (gzipPid == 0) { dup2(gzipDataPipe[0], 0); close(gzipDataPipe[1]); if (tbInfo.tarFd != 1) dup2(tbInfo.tarFd, 1); close(gzipStatusPipe[0]); fcntl(gzipStatusPipe[1], F_SETFD, FD_CLOEXEC); /* close on exec shows success */ execlp(zip_exec, zip_exec, "-f", NULL); vfork_exec_errno = errno; close(gzipStatusPipe[1]); exit(-1); } else if (gzipPid > 0) { close(gzipDataPipe[0]); close(gzipStatusPipe[1]); while (1) { char buf; int n = full_read(gzipStatusPipe[0], &buf, 1); if (n == 0 && vfork_exec_errno != 0) { errno = vfork_exec_errno; bb_perror_msg_and_die("cannot exec %s", zip_exec); } else if ((n < 0) && (errno == EAGAIN || errno == EINTR)) continue; /* try it again */ break; } close(gzipStatusPipe[0]); tbInfo.tarFd = gzipDataPipe[1]; } else bb_perror_msg_and_die("vfork gzip"); } tbInfo.excludeList = exclude; /* Read the directory/files and iterate over them one at a time */ while (include) { if (!recursive_action(include->data, TRUE, dereferenceFlag, FALSE, writeFileToTarball, writeFileToTarball, &tbInfo, 0)) { errorFlag = TRUE; } include = include->link; } /* Write two empty blocks to the end of the archive */ bzero(bb_common_bufsiz1, 2*TAR_BLOCK_SIZE); xwrite(tbInfo.tarFd, bb_common_bufsiz1, 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 (gzipPid && waitpid(gzipPid, NULL, 0) == -1) bb_error_msg("waitpid failed"); return !errorFlag; } #else int writeTarFile(const int tar_fd, const int verboseFlag, const unsigned long dereferenceFlag, const llist_t *include, const llist_t *exclude, const int gzip); #endif /* tar_create */ #ifdef CONFIG_FEATURE_TAR_FROM static llist_t *append_file_list_to_list(llist_t *list) { FILE *src_stream; llist_t *cur = list; llist_t *tmp; char *line; llist_t *newlist = NULL; while (cur) { src_stream = xfopen(cur->data, "r"); tmp = cur; cur = cur->link; free(tmp); while ((line = xmalloc_getline(src_stream)) != NULL) { char *filename_ptr = last_char_is(line, '/'); if (filename_ptr > line) *filename_ptr = '\0'; llist_add_to(&newlist, line); } fclose(src_stream); } return newlist; } #else #define append_file_list_to_list(x) 0 #endif #ifdef CONFIG_FEATURE_TAR_COMPRESS static char 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"); } archive_handle->src_fd = open_transformer(archive_handle->src_fd, uncompress); archive_handle->offset = 0; while (get_header_tar(archive_handle) == EXIT_SUCCESS) /* nothing */; /* Can only do one file at a time */ return EXIT_FAILURE; } #else #define get_header_tar_Z 0 #endif #define CTX_TEST (1 << 0) #define CTX_EXTRACT (1 << 1) #define TAR_OPT_BASEDIR (1 << 2) #define TAR_OPT_TARNAME (1 << 3) #define TAR_OPT_2STDOUT (1 << 4) #define TAR_OPT_P (1 << 5) #define TAR_OPT_VERBOSE (1 << 6) #define TAR_OPT_KEEP_OLD (1 << 7) #define TAR_OPT_AFTER_START 8 #define CTX_CREATE (1 << (TAR_OPT_AFTER_START)) #define TAR_OPT_DEREFERENCE (1 << (TAR_OPT_AFTER_START + 1)) #ifdef CONFIG_FEATURE_TAR_CREATE # define TAR_OPT_STR_CREATE "ch" # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START + 2 #else # define TAR_OPT_STR_CREATE "" # define TAR_OPT_AFTER_CREATE TAR_OPT_AFTER_START #endif #define TAR_OPT_BZIP2 (1 << (TAR_OPT_AFTER_CREATE)) #ifdef CONFIG_FEATURE_TAR_BZIP2 # define TAR_OPT_STR_BZIP2 "j" # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE + 1 #else # define TAR_OPT_STR_BZIP2 "" # define TAR_OPT_AFTER_BZIP2 TAR_OPT_AFTER_CREATE #endif #define TAR_OPT_LZMA (1 << (TAR_OPT_AFTER_BZIP2)) #ifdef CONFIG_FEATURE_TAR_LZMA # define TAR_OPT_STR_LZMA "a" # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2 + 1 #else # define TAR_OPT_STR_LZMA "" # define TAR_OPT_AFTER_LZMA TAR_OPT_AFTER_BZIP2 #endif #define TAR_OPT_INCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA)) #define TAR_OPT_EXCLUDE_FROM (1 << (TAR_OPT_AFTER_LZMA + 1)) #ifdef CONFIG_FEATURE_TAR_FROM # define TAR_OPT_STR_FROM "T:X:" # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA + 2 #else # define TAR_OPT_STR_FROM "" # define TAR_OPT_AFTER_FROM TAR_OPT_AFTER_LZMA #endif #define TAR_OPT_GZIP (1 << (TAR_OPT_AFTER_FROM)) #ifdef CONFIG_FEATURE_TAR_GZIP # define TAR_OPT_STR_GZIP "z" # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM + 1 #else # define TAR_OPT_STR_GZIP "" # define TAR_OPT_AFTER_GZIP TAR_OPT_AFTER_FROM #endif #define TAR_OPT_UNCOMPRESS (1 << (TAR_OPT_AFTER_GZIP)) #ifdef CONFIG_FEATURE_TAR_COMPRESS # define TAR_OPT_STR_COMPRESS "Z" # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP + 1 #else # define TAR_OPT_STR_COMPRESS "" # define TAR_OPT_AFTER_COMPRESS TAR_OPT_AFTER_GZIP #endif #define TAR_OPT_NOPRESERVE_OWN (1 << (TAR_OPT_AFTER_COMPRESS)) #define TAR_OPT_NOPRESERVE_PERM (1 << (TAR_OPT_AFTER_COMPRESS + 1)) #define TAR_OPT_STR_NOPRESERVE "\203\213" #define TAR_OPT_AFTER_NOPRESERVE TAR_OPT_AFTER_COMPRESS + 2 static const char tar_options[] = "txC:f:Opvk" \ TAR_OPT_STR_CREATE \ TAR_OPT_STR_BZIP2 \ TAR_OPT_STR_LZMA \ TAR_OPT_STR_FROM \ TAR_OPT_STR_GZIP \ TAR_OPT_STR_COMPRESS \ TAR_OPT_STR_NOPRESERVE; #ifdef CONFIG_FEATURE_TAR_LONG_OPTIONS static const struct option tar_long_options[] = { { "list", 0, NULL, 't' }, { "extract", 0, NULL, 'x' }, { "directory", 1, NULL, 'C' }, { "file", 1, NULL, 'f' }, { "to-stdout", 0, NULL, 'O' }, { "same-permissions", 0, NULL, 'p' }, { "verbose", 0, NULL, 'v' }, { "keep-old", 0, NULL, 'k' }, { "no-same-owner", 0, NULL, '\203' }, { "no-same-permissions",0, NULL, '\213' }, # ifdef CONFIG_FEATURE_TAR_CREATE { "create", 0, NULL, 'c' }, { "dereference", 0, NULL, 'h' }, # endif # ifdef CONFIG_FEATURE_TAR_BZIP2 { "bzip2", 0, NULL, 'j' }, # endif # ifdef CONFIG_FEATURE_TAR_LZMA { "lzma", 0, NULL, 'a' }, # endif # ifdef CONFIG_FEATURE_TAR_FROM { "files-from", 1, NULL, 'T' }, { "exclude-from", 1, NULL, 'X' }, { "exclude", 1, NULL, '\n' }, # endif # ifdef CONFIG_FEATURE_TAR_GZIP { "gzip", 0, NULL, 'z' }, # endif # ifdef CONFIG_FEATURE_TAR_COMPRESS { "compress", 0, NULL, 'Z' }, # endif { 0, 0, 0, 0 } }; #else #define tar_long_options 0 #endif int tar_main(int argc, char **argv) { char (*get_header_ptr)(archive_handle_t *) = get_header_tar; archive_handle_t *tar_handle; char *base_dir = NULL; const char *tar_filename = "-"; unsigned opt; llist_t *excludes = NULL; /* Initialise default values */ tar_handle = init_handle(); tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL; /* Prepend '-' to the first argument if required */ opt_complementary = ENABLE_FEATURE_TAR_CREATE ? "--:X::T::\n::c:t:x:?:c--tx:t--cx:x--ct" : "--:X::T::\n::t:x:?:t--x:x--t"; if (ENABLE_FEATURE_TAR_LONG_OPTIONS) applet_long_options = tar_long_options; opt = getopt32(argc, argv, tar_options, &base_dir, /* Change to dir */ &tar_filename /* archive filename */ #ifdef CONFIG_FEATURE_TAR_FROM , &(tar_handle->accept), &(tar_handle->reject), &excludes #endif ); if (opt & CTX_TEST) { if (tar_handle->action_header == header_list || tar_handle->action_header == header_verbose_list ) { tar_handle->action_header = header_verbose_list; } else tar_handle->action_header = header_list; } if ((opt & CTX_EXTRACT) && tar_handle->action_data != data_extract_to_stdout) tar_handle->action_data = data_extract_all; if (opt & TAR_OPT_2STDOUT) tar_handle->action_data = data_extract_to_stdout; if (opt & TAR_OPT_VERBOSE) { if (tar_handle->action_header == header_list || tar_handle->action_header == header_verbose_list ) { tar_handle->action_header = header_verbose_list; } else tar_handle->action_header = header_list; } if (opt & TAR_OPT_KEEP_OLD) tar_handle->flags &= ~ARCHIVE_EXTRACT_UNCONDITIONAL; if (opt & TAR_OPT_NOPRESERVE_OWN) tar_handle->flags |= ARCHIVE_NOPRESERVE_OWN; if (opt & TAR_OPT_NOPRESERVE_PERM) tar_handle->flags |= ARCHIVE_NOPRESERVE_PERM; if (ENABLE_FEATURE_TAR_GZIP && (opt & TAR_OPT_GZIP)) get_header_ptr = get_header_tar_gz; if (ENABLE_FEATURE_TAR_BZIP2 && (opt & TAR_OPT_BZIP2)) get_header_ptr = get_header_tar_bz2; if (ENABLE_FEATURE_TAR_LZMA && (opt & TAR_OPT_LZMA)) get_header_ptr = get_header_tar_lzma; if (ENABLE_FEATURE_TAR_COMPRESS && (opt & TAR_OPT_UNCOMPRESS)) get_header_ptr = get_header_tar_Z; if (ENABLE_FEATURE_TAR_FROM) { tar_handle->reject = append_file_list_to_list(tar_handle->reject); /* Append excludes to reject */ while (excludes) { llist_t *temp = excludes->link; excludes->link = tar_handle->reject; tar_handle->reject = excludes; excludes = temp; } tar_handle->accept = append_file_list_to_list(tar_handle->accept); } /* Check if we are reading from stdin */ if (argv[optind] && *argv[optind] == '-') { /* Default is to read from stdin, so just skip to next arg */ optind++; } /* Setup an array of filenames to work with */ /* TODO: This is the same as in ar, separate function ? */ while (optind < argc) { char *filename_ptr = last_char_is(argv[optind], '/'); if (filename_ptr > argv[optind]) *filename_ptr = '\0'; llist_add_to(&(tar_handle->accept), argv[optind]); optind++; } if (tar_handle->accept || tar_handle->reject) tar_handle->filter = filter_accept_reject_list; /* Open the tar file */ { FILE *tar_stream; int flags; if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_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 ((tar_filename[0] == '-') && (tar_filename[1] == '\0')) { tar_handle->src_fd = fileno(tar_stream); tar_handle->seek = seek_by_read; } else { tar_handle->src_fd = xopen3(tar_filename, flags, 0666); } } if (base_dir) xchdir(base_dir); /* create an archive */ if (ENABLE_FEATURE_TAR_CREATE && (opt & CTX_CREATE)) { int verboseFlag = FALSE; int zipMode = 0; if (ENABLE_FEATURE_TAR_GZIP && get_header_ptr == get_header_tar_gz) zipMode = 1; if (ENABLE_FEATURE_TAR_BZIP2 && get_header_ptr == get_header_tar_bz2) zipMode = 2; if (tar_handle->action_header == header_list || tar_handle->action_header == header_verbose_list ) { verboseFlag = TRUE; } writeTarFile(tar_handle->src_fd, verboseFlag, opt & TAR_OPT_DEREFERENCE, tar_handle->accept, tar_handle->reject, zipMode); } else { while (get_header_ptr(tar_handle) == EXIT_SUCCESS) /* nothing */; /* 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; }