/* 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 <bug1@iinet.net.au> * * 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 * 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 <fcntl.h> #include <getopt.h> #include <search.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fnmatch.h> #include <string.h> #include <errno.h> #include <signal.h> #include <sys/wait.h> #include <sys/socket.h> #include <sys/sysmacros.h> /* major() and minor() */ #include "unarchive.h" #include "busybox.h" #ifdef CONFIG_FEATURE_TAR_CREATE /* Tar file constants */ # define TAR_MAGIC "ustar" /* ustar and a null */ # define TAR_VERSION " " /* Be compatable with GNU tar format */ static const int TAR_BLOCK_SIZE = 512; static const int TAR_MAGIC_LEN = 6; static const int TAR_VERSION_LEN = 2; /* POSIX tar Header Block, from POSIX 1003.1-1990 */ enum { NAME_SIZE = 100 }; /* because gcc won't let me use 'static const int' */ 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 { 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 */ 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 inline void addHardLinkInfo(HardLinkInfo ** hlInfoHeadPtr, struct stat *statbuf, const char *name) { /* Note: hlInfoHeadPtr can never be NULL! */ HardLinkInfo *hlInfo; hlInfo = (HardLinkInfo *) xmalloc(sizeof(HardLinkInfo) + strlen(name)); hlInfo->next = *hlInfoHeadPtr; *hlInfoHeadPtr = hlInfo; hlInfo->dev = statbuf->st_dev; hlInfo->ino = statbuf->st_ino; hlInfo->linkCount = statbuf->st_nlink; strcpy(hlInfo->name, name); } 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 inline 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 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 inline 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) */ if (my_getpwuid(header.uname, statbuf->st_uid, sizeof(header.uname)) == NULL) strcpy(header.uname, "root"); if (my_getgrgid(header.gname, statbuf->st_gid, sizeof(header.gname)) == NULL) strcpy(header.gname, "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 { bb_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 = bb_full_write(tbInfo->tarFd, (char *) &header, sizeof(struct TarHeader))) < 0) { bb_error_msg(bb_msg_io_error, real_name); return (FALSE); } /* Pad the header up to the tar block size */ for (; size < TAR_BLOCK_SIZE; size++) { write(tbInfo->tarFd, "\0", 1); } /* 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 inline 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; } # endif 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); 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(bb_msg_name_longer_than_foo, NAME_SIZE); return (TRUE); } if (header_name[0] == '\0') return TRUE; # ifdef CONFIG_FEATURE_TAR_FROM if (exclude_file(tbInfo->excludeList, header_name)) { return SKIP; } # endif /* CONFIG_FEATURE_TAR_FROM */ 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; ssize_t readSize = 0; /* open the file we want to archive, and make sure all is well */ if ((inputFileFd = open(fileName, O_RDONLY)) < 0) { bb_perror_msg("%s: Cannot open", fileName); return (FALSE); } /* write the file to the archive */ readSize = bb_copyfd_eof(inputFileFd, tbInfo->tarFd); /* 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 inline int writeTarFile(const int tar_fd, const int verboseFlag, const unsigned long dereferenceFlag, const llist_t *include, const llist_t *exclude, const int gzip) { #ifdef CONFIG_FEATURE_TAR_GZIP int gzipDataPipe[2] = { -1, -1 }; int gzipStatusPipe[2] = { -1, -1 }; pid_t gzipPid = 0; volatile int vfork_exec_errno = 0; #endif int errorFlag = FALSE; ssize_t size; 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("Couldnt stat tar file"); #ifdef CONFIG_FEATURE_TAR_GZIP if (gzip) { if (pipe(gzipDataPipe) < 0 || pipe(gzipStatusPipe) < 0) { bb_perror_msg_and_die("Failed to create gzip pipe"); } signal(SIGPIPE, SIG_IGN); /* we only want EPIPE on errors */ # if __GNUC__ /* Avoid vfork clobbering */ (void) &include; (void) &errorFlag; # 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 sucess */ execl("/bin/gzip", "gzip", "-f", 0); 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 = bb_full_read(gzipStatusPipe[0], &buf, 1); if (n == 0 && vfork_exec_errno != 0) { errno = vfork_exec_errno; bb_perror_msg_and_die("Could not exec gzip process"); } 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("Failed to vfork gzip process"); } } #endif 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, (void *) &tbInfo)) { errorFlag = TRUE; } include = include->link; } /* 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(tbInfo.tarFd); if (errorFlag) bb_error_msg("Error exit delayed from previous errors"); freeHardLinkInfo(&tbInfo.hlInfoHead); #ifdef CONFIG_FEATURE_TAR_GZIP if (gzip && gzipPid) { if (waitpid(gzipPid, NULL, 0) == -1) printf("Couldnt wait ?"); } #endif return !errorFlag; } #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 = bb_xfopen(cur->data, "r"); tmp = cur; cur = cur->link; free(tmp); while((line = bb_get_chomped_line_from_file(src_stream)) != NULL) { newlist = llist_add_to(newlist, line); } fclose(src_stream); } return newlist; } #endif #ifdef CONFIG_FEATURE_TAR_COMPRESS static char get_header_tar_Z(archive_handle_t *archive_handle) { /* Cant lseek over pipe's */ archive_handle->seek = seek_by_char; /* do the decompression, and cleanup */ if ((bb_xread_char(archive_handle->src_fd) != 0x1f) || (bb_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); /* Can only do one file at a time */ return(EXIT_FAILURE); } #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) #ifdef CONFIG_FEATURE_TAR_CREATE # define CTX_CREATE (1 << 8) # define TAR_OPT_DEREFERNCE (1 << 9) # define TAR_OPT_STR_CREATE "ch" # define TAR_OPT_FLAG_CREATE 2 #else //# define CTX_CREATE 0 # define TAR_OPT_STR_CREATE "" # define TAR_OPT_FLAG_CREATE 0 #endif #ifdef CONFIG_FEATURE_TAR_BZIP2 # define TAR_OPT_BZIP2 (1 << (8 + TAR_OPT_FLAG_CREATE)) # define TAR_OPT_STR_BZIP2 "j" # define TAR_OPT_FLAG_BZIP2 1 #else # define TAR_OPT_STR_BZIP2 "" # define TAR_OPT_FLAG_BZIP2 0 #endif #ifdef CONFIG_FEATURE_TAR_FROM # define TAR_OPT_INCLUDE_FROM (1 << (8 + TAR_OPT_FLAG_CREATE + TAR_OPT_FLAG_BZIP2)) # define TAR_OPT_EXCLUDE_FROM (1 << (8 + TAR_OPT_FLAG_CREATE + TAR_OPT_FLAG_BZIP2 + 1)) # define TAR_OPT_STR_FROM "T:X:" # define TAR_OPT_FLAG_FROM 2 #else # define TAR_OPT_STR_FROM "" # define TAR_OPT_FLAG_FROM 0 #endif #ifdef CONFIG_FEATURE_TAR_GZIP # define TAR_OPT_GZIP (1 << (8 + TAR_OPT_FLAG_CREATE + TAR_OPT_FLAG_BZIP2 + TAR_OPT_FLAG_FROM)) # define TAR_OPT_STR_GZIP "z" # define TAR_OPT_FLAG_GZIP 1 #else # define TAR_OPT_STR_GZIP "" # define TAR_OPT_FLAG_GZIP 0 #endif #ifdef CONFIG_FEATURE_TAR_COMPRESS # define TAR_OPT_UNCOMPRESS (1 << (8 + TAR_OPT_FLAG_CREATE + TAR_OPT_FLAG_BZIP2 + TAR_OPT_FLAG_FROM + TAR_OPT_FLAG_GZIP)) # define TAR_OPT_STR_COMPRESS "Z" #else # define TAR_OPT_STR_COMPRESS "" #endif static const char tar_options[]="txC:f:Opvk" \ TAR_OPT_STR_CREATE \ TAR_OPT_STR_BZIP2 \ TAR_OPT_STR_FROM \ TAR_OPT_STR_GZIP \ TAR_OPT_STR_COMPRESS; #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' }, # 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_FROM { "files-from", 1, NULL, 'T' }, { "exclude-from", 1, NULL, 'X' }, # 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 } }; #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 long opt; unsigned long ctx_flag = 0; if (argc < 2) { bb_show_usage(); } /* Prepend '-' to the first argument if required */ if (argv[1][0] != '-') { char *tmp; bb_xasprintf(&tmp, "-%s", argv[1]); argv[1] = tmp; } /* Initialise default values */ tar_handle = init_handle(); tar_handle->flags = ARCHIVE_CREATE_LEADING_DIRS | ARCHIVE_PRESERVE_DATE | ARCHIVE_EXTRACT_UNCONDITIONAL; bb_opt_complementaly = "c~tx:t~cx:x~ct:X*:T*"; #ifdef CONFIG_FEATURE_TAR_LONG_OPTIONS bb_applet_long_options = tar_long_options; #endif opt = bb_getopt_ulflags(argc, argv, tar_options, &base_dir, /* Change to dir <optarg> */ &tar_filename /* archive filename */ #ifdef CONFIG_FEATURE_TAR_FROM , &(tar_handle->accept), &(tar_handle->reject) #endif ); /* Check one and only one context option was given */ if(opt & BB_GETOPT_ERROR) { bb_show_usage(); } #ifdef CONFIG_FEATURE_TAR_CREATE ctx_flag = opt & (CTX_CREATE | CTX_TEST | CTX_EXTRACT); #else ctx_flag = opt & (CTX_TEST | CTX_EXTRACT); #endif if (ctx_flag == 0) { bb_show_usage(); } if(ctx_flag & 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(ctx_flag & CTX_EXTRACT) { if (tar_handle->action_data != data_extract_to_stdout) tar_handle->action_data = data_extract_all; } if(opt & TAR_OPT_2STDOUT) { /* To stdout */ 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; } #ifdef CONFIG_FEATURE_TAR_GZIP if(opt & TAR_OPT_GZIP) { get_header_ptr = get_header_tar_gz; } #endif #ifdef CONFIG_FEATURE_TAR_BZIP2 if(opt & TAR_OPT_BZIP2) { get_header_ptr = get_header_tar_bz2; } #endif #ifdef CONFIG_FEATURE_TAR_COMPRESS if(opt & TAR_OPT_UNCOMPRESS) { get_header_ptr = get_header_tar_Z; } #endif #ifdef CONFIG_FEATURE_TAR_FROM if(opt & TAR_OPT_EXCLUDE_FROM) { tar_handle->reject = append_file_list_to_list(tar_handle->reject); } if(opt & TAR_OPT_INCLUDE_FROM) { tar_handle->accept = append_file_list_to_list(tar_handle->accept); } #endif /* 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) { *filename_ptr = '\0'; } tar_handle->accept = 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; #ifdef CONFIG_FEATURE_TAR_CREATE if (opt & CTX_CREATE) { /* Make sure there is at least one file to tar up. */ if (tar_handle->accept == NULL) { bb_error_msg_and_die("Cowardly refusing to create an empty archive"); } tar_stream = stdout; flags = O_WRONLY | O_CREAT | O_EXCL; unlink(tar_filename); } else #endif { 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_char; } else { tar_handle->src_fd = bb_xopen(tar_filename, flags); } } if ((base_dir) && (chdir(base_dir))) { bb_perror_msg_and_die("Couldnt chdir to %s", base_dir); } #ifdef CONFIG_FEATURE_TAR_CREATE /* create an archive */ if (opt & CTX_CREATE) { int verboseFlag = FALSE; int gzipFlag = FALSE; # ifdef CONFIG_FEATURE_TAR_GZIP if (get_header_ptr == get_header_tar_gz) { gzipFlag = TRUE; } # endif /* CONFIG_FEATURE_TAR_GZIP */ # ifdef CONFIG_FEATURE_TAR_BZIP2 if (get_header_ptr == get_header_tar_bz2) { bb_error_msg_and_die("Creating bzip2 compressed archives is not currently supported."); } # endif /* CONFIG_FEATURE_TAR_BZIP2 */ 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_DEREFERNCE, tar_handle->accept, tar_handle->reject, gzipFlag); } else #endif /* CONFIG_FEATURE_TAR_CREATE */ { while (get_header_ptr(tar_handle) == EXIT_SUCCESS); /* Ckeck that every file that should have been extracted was */ while (tar_handle->accept) { if (find_list_entry(tar_handle->reject, tar_handle->accept->data) == NULL) { if (find_list_entry(tar_handle->passed, tar_handle->accept->data) == NULL) { bb_error_msg_and_die("%s: Not found in archive\n", tar_handle->accept->data); } } tar_handle->accept = tar_handle->accept->link; } } #ifdef CONFIG_FEATURE_CLEAN_UP if (tar_handle->src_fd != STDIN_FILENO) { close(tar_handle->src_fd); } #endif /* CONFIG_FEATURE_CLEAN_UP */ return(EXIT_SUCCESS); }