/*- * Copyright (c) 2003-2007 Tim Kientzle * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "bsdtar_platform.h" __FBSDID("$FreeBSD: src/usr.bin/tar/write.c,v 1.79 2008/11/27 05:49:52 kientzle Exp $"); #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_ACL_H #include #endif #ifdef HAVE_SYS_IOCTL_H #include #endif #ifdef HAVE_SYS_STAT_H #include #endif #ifdef HAVE_ATTR_XATTR_H #include #endif #ifdef HAVE_ERRNO_H #include #endif #if defined(HAVE_EXT2FS_EXT2_FS_H) && !defined(__CYGWIN__) /* This header exists but is broken on Cygwin. */ #include #endif #ifdef HAVE_FCNTL_H #include #endif #ifdef HAVE_FNMATCH_H #include #endif #ifdef HAVE_GRP_H #include #endif #ifdef HAVE_LIMITS_H #include #endif #ifdef HAVE_LINUX_FS_H #include /* for Linux file flags */ #endif #ifdef HAVE_PWD_H #include #endif #include #ifdef HAVE_STDLIB_H #include #endif #ifdef HAVE_STRING_H #include #endif #ifdef HAVE_UNISTD_H #include #endif #ifdef __APPLE__ #include #include #include #endif #include "bsdtar.h" #include "tree.h" /* Size of buffer for holding file data prior to writing. */ #define FILEDATABUFLEN 65536 /* Fixed size of uname/gname caches. */ #define name_cache_size 101 static const char * const NO_NAME = "(noname)"; struct archive_dir_entry { struct archive_dir_entry *next; time_t mtime_sec; int mtime_nsec; char *name; }; struct archive_dir { struct archive_dir_entry *head, *tail; }; struct name_cache { int probes; int hits; size_t size; struct { id_t id; const char *name; } cache[name_cache_size]; }; static void add_dir_list(struct bsdtar *bsdtar, const char *path, time_t mtime_sec, int mtime_nsec); static int append_archive(struct bsdtar *, struct archive *, struct archive *ina); static int append_archive_filename(struct bsdtar *, struct archive *, const char *fname); static void archive_names_from_file(struct bsdtar *bsdtar, struct archive *a); static int archive_names_from_file_helper(struct bsdtar *bsdtar, const char *line); static int copy_file_data(struct bsdtar *bsdtar, struct archive *a, struct archive *ina); static void create_cleanup(struct bsdtar *); static void free_cache(struct name_cache *cache); static const char * lookup_gname(struct bsdtar *bsdtar, gid_t gid); static int lookup_gname_helper(struct bsdtar *bsdtar, const char **name, id_t gid); static const char * lookup_uname(struct bsdtar *bsdtar, uid_t uid); static int lookup_uname_helper(struct bsdtar *bsdtar, const char **name, id_t uid); static int new_enough(struct bsdtar *, const char *path, const struct stat *); static void setup_acls(struct bsdtar *, struct archive_entry *, const char *path); static void setup_xattrs(struct bsdtar *, struct archive_entry *, const char *path); static void test_for_append(struct bsdtar *); static void write_archive(struct archive *, struct bsdtar *); static void write_entry(struct bsdtar *, struct archive *, const struct stat *, const char *pathname, const char *accpath); static void write_entry_backend(struct bsdtar *, struct archive *, struct archive_entry *); static int write_file_data(struct bsdtar *, struct archive *, struct archive_entry *, int fd); static void write_hierarchy(struct bsdtar *, struct archive *, const char *); void tar_mode_c(struct bsdtar *bsdtar) { struct archive *a; int r; if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL) bsdtar_errc(bsdtar, 1, 0, "no files or directories specified"); a = archive_write_new(); /* Support any format that the library supports. */ if (bsdtar->create_format == NULL) { r = archive_write_set_format_pax_restricted(a); bsdtar->create_format = "pax restricted"; } else { r = archive_write_set_format_by_name(a, bsdtar->create_format); } if (r != ARCHIVE_OK) { fprintf(stderr, "Can't use format %s: %s\n", bsdtar->create_format, archive_error_string(a)); usage(bsdtar); } /* * If user explicitly set the block size, then assume they * want the last block padded as well. Otherwise, use the * default block size and accept archive_write_open_file()'s * default padding decisions. */ if (bsdtar->bytes_per_block != 0) { archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block); archive_write_set_bytes_in_last_block(a, bsdtar->bytes_per_block); } else archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK); if (bsdtar->compress_program) { archive_write_set_compression_program(a, bsdtar->compress_program); } else { switch (bsdtar->create_compression) { case 0: archive_write_set_compression_none(a); break; #ifdef HAVE_LIBBZ2 case 'j': case 'y': archive_write_set_compression_bzip2(a); break; #endif #ifdef HAVE_LIBZ case 'z': archive_write_set_compression_gzip(a); break; #endif case 'Z': archive_write_set_compression_compress(a); break; default: bsdtar_errc(bsdtar, 1, 0, "Unrecognized compression option -%c", bsdtar->create_compression); } } r = archive_write_open_file(a, bsdtar->filename); if (r != ARCHIVE_OK) bsdtar_errc(bsdtar, 1, 0, archive_error_string(a)); write_archive(a, bsdtar); } /* * Same as 'c', except we only support tar or empty formats in * uncompressed files on disk. */ void tar_mode_r(struct bsdtar *bsdtar) { off_t end_offset; int format; struct archive *a; struct archive_entry *entry; int r; /* Sanity-test some arguments and the file. */ test_for_append(bsdtar); format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; bsdtar->fd = open(bsdtar->filename, O_RDWR | O_CREAT, 0666); if (bsdtar->fd < 0) bsdtar_errc(bsdtar, 1, errno, "Cannot open %s", bsdtar->filename); a = archive_read_new(); archive_read_support_compression_all(a); archive_read_support_format_tar(a); archive_read_support_format_gnutar(a); r = archive_read_open_fd(a, bsdtar->fd, 10240); if (r != ARCHIVE_OK) bsdtar_errc(bsdtar, 1, archive_errno(a), "Can't read archive %s: %s", bsdtar->filename, archive_error_string(a)); while (0 == archive_read_next_header(a, &entry)) { if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) { archive_read_finish(a); close(bsdtar->fd); bsdtar_errc(bsdtar, 1, 0, "Cannot append to compressed archive."); } /* Keep going until we hit end-of-archive */ format = archive_format(a); } end_offset = archive_read_header_position(a); archive_read_finish(a); /* Re-open archive for writing */ a = archive_write_new(); archive_write_set_compression_none(a); /* * Set the format to be used for writing. To allow people to * extend empty files, we need to allow them to specify the format, * which opens the possibility that they will specify a format that * doesn't match the existing format. Hence, the following bit * of arcane ugliness. */ if (bsdtar->create_format != NULL) { /* If the user requested a format, use that, but ... */ archive_write_set_format_by_name(a, bsdtar->create_format); /* ... complain if it's not compatible. */ format &= ARCHIVE_FORMAT_BASE_MASK; if (format != (int)(archive_format(a) & ARCHIVE_FORMAT_BASE_MASK) && format != ARCHIVE_FORMAT_EMPTY) { bsdtar_errc(bsdtar, 1, 0, "Format %s is incompatible with the archive %s.", bsdtar->create_format, bsdtar->filename); } } else { /* * Just preserve the current format, with a little care * for formats that libarchive can't write. */ if (format == ARCHIVE_FORMAT_TAR_GNUTAR) /* TODO: When gtar supports pax, use pax restricted. */ format = ARCHIVE_FORMAT_TAR_USTAR; if (format == ARCHIVE_FORMAT_EMPTY) format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; archive_write_set_format(a, format); } lseek(bsdtar->fd, end_offset, SEEK_SET); /* XXX check return val XXX */ archive_write_open_fd(a, bsdtar->fd); /* XXX check return val XXX */ write_archive(a, bsdtar); /* XXX check return val XXX */ close(bsdtar->fd); bsdtar->fd = -1; } void tar_mode_u(struct bsdtar *bsdtar) { off_t end_offset; struct archive *a; struct archive_entry *entry; int format; struct archive_dir_entry *p; struct archive_dir archive_dir; bsdtar->archive_dir = &archive_dir; memset(&archive_dir, 0, sizeof(archive_dir)); format = ARCHIVE_FORMAT_TAR_PAX_RESTRICTED; /* Sanity-test some arguments and the file. */ test_for_append(bsdtar); bsdtar->fd = open(bsdtar->filename, O_RDWR); if (bsdtar->fd < 0) bsdtar_errc(bsdtar, 1, errno, "Cannot open %s", bsdtar->filename); a = archive_read_new(); archive_read_support_compression_all(a); archive_read_support_format_tar(a); archive_read_support_format_gnutar(a); if (archive_read_open_fd(a, bsdtar->fd, bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block : DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) { bsdtar_errc(bsdtar, 1, 0, "Can't open %s: %s", bsdtar->filename, archive_error_string(a)); } /* Build a list of all entries and their recorded mod times. */ while (0 == archive_read_next_header(a, &entry)) { if (archive_compression(a) != ARCHIVE_COMPRESSION_NONE) { archive_read_finish(a); close(bsdtar->fd); bsdtar_errc(bsdtar, 1, 0, "Cannot append to compressed archive."); } add_dir_list(bsdtar, archive_entry_pathname(entry), archive_entry_mtime(entry), archive_entry_mtime_nsec(entry)); /* Record the last format determination we see */ format = archive_format(a); /* Keep going until we hit end-of-archive */ } end_offset = archive_read_header_position(a); archive_read_finish(a); /* Re-open archive for writing. */ a = archive_write_new(); archive_write_set_compression_none(a); /* * Set format to same one auto-detected above, except that * we don't write GNU tar format, so use ustar instead. */ if (format == ARCHIVE_FORMAT_TAR_GNUTAR) format = ARCHIVE_FORMAT_TAR_USTAR; archive_write_set_format(a, format); if (bsdtar->bytes_per_block != 0) { archive_write_set_bytes_per_block(a, bsdtar->bytes_per_block); archive_write_set_bytes_in_last_block(a, bsdtar->bytes_per_block); } else archive_write_set_bytes_per_block(a, DEFAULT_BYTES_PER_BLOCK); lseek(bsdtar->fd, end_offset, SEEK_SET); ftruncate(bsdtar->fd, end_offset); archive_write_open_fd(a, bsdtar->fd); write_archive(a, bsdtar); close(bsdtar->fd); bsdtar->fd = -1; while (bsdtar->archive_dir->head != NULL) { p = bsdtar->archive_dir->head->next; free(bsdtar->archive_dir->head->name); free(bsdtar->archive_dir->head); bsdtar->archive_dir->head = p; } bsdtar->archive_dir->tail = NULL; } /* * Write user-specified files/dirs to opened archive. */ static void write_archive(struct archive *a, struct bsdtar *bsdtar) { const char *arg; struct archive_entry *entry, *sparse_entry; /* We want to catch SIGINFO and SIGUSR1. */ siginfo_init(bsdtar); /* Allocate a buffer for file data. */ if ((bsdtar->buff = malloc(FILEDATABUFLEN)) == NULL) bsdtar_errc(bsdtar, 1, 0, "cannot allocate memory"); if ((bsdtar->resolver = archive_entry_linkresolver_new()) == NULL) bsdtar_errc(bsdtar, 1, 0, "cannot create link resolver"); archive_entry_linkresolver_set_strategy(bsdtar->resolver, archive_format(a)); if (bsdtar->names_from_file != NULL) archive_names_from_file(bsdtar, a); while (*bsdtar->argv) { arg = *bsdtar->argv; if (arg[0] == '-' && arg[1] == 'C') { arg += 2; if (*arg == '\0') { bsdtar->argv++; arg = *bsdtar->argv; if (arg == NULL) { bsdtar_warnc(bsdtar, 1, 0, "Missing argument for -C"); bsdtar->return_value = 1; goto cleanup; } } set_chdir(bsdtar, arg); } else { if (*arg != '/' && (arg[0] != '@' || arg[1] != '/')) do_chdir(bsdtar); /* Handle a deferred -C */ if (*arg == '@') { if (append_archive_filename(bsdtar, a, arg + 1) != 0) break; } else write_hierarchy(bsdtar, a, arg); } bsdtar->argv++; } entry = NULL; archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry); while (entry != NULL) { write_entry_backend(bsdtar, a, entry); archive_entry_free(entry); entry = NULL; archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry); } create_cleanup(bsdtar); if (archive_write_close(a)) { bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(a)); bsdtar->return_value = 1; } cleanup: /* Free file data buffer. */ free(bsdtar->buff); if (bsdtar->option_totals) { fprintf(stderr, "Total bytes written: " BSDTAR_FILESIZE_PRINTF "\n", (BSDTAR_FILESIZE_TYPE)archive_position_compressed(a)); } archive_write_finish(a); /* Restore old SIGINFO + SIGUSR1 handlers. */ siginfo_done(bsdtar); } /* * Archive names specified in file. * * Unless --null was specified, a line containing exactly "-C" will * cause the next line to be a directory to pass to chdir(). If * --null is specified, then a line "-C" is just another filename. */ void archive_names_from_file(struct bsdtar *bsdtar, struct archive *a) { bsdtar->archive = a; bsdtar->next_line_is_dir = 0; process_lines(bsdtar, bsdtar->names_from_file, archive_names_from_file_helper); if (bsdtar->next_line_is_dir) bsdtar_errc(bsdtar, 1, errno, "Unexpected end of filename list; " "directory expected after -C"); } static int archive_names_from_file_helper(struct bsdtar *bsdtar, const char *line) { if (bsdtar->next_line_is_dir) { set_chdir(bsdtar, line); bsdtar->next_line_is_dir = 0; } else if (!bsdtar->option_null && strcmp(line, "-C") == 0) bsdtar->next_line_is_dir = 1; else { if (*line != '/') do_chdir(bsdtar); /* Handle a deferred -C */ write_hierarchy(bsdtar, bsdtar->archive, line); } return (0); } /* * Copy from specified archive to current archive. Returns non-zero * for write errors (which force us to terminate the entire archiving * operation). If there are errors reading the input archive, we set * bsdtar->return_value but return zero, so the overall archiving * operation will complete and return non-zero. */ static int append_archive_filename(struct bsdtar *bsdtar, struct archive *a, const char *filename) { struct archive *ina; int rc; if (strcmp(filename, "-") == 0) filename = NULL; /* Library uses NULL for stdio. */ ina = archive_read_new(); archive_read_support_format_all(ina); archive_read_support_compression_all(ina); if (archive_read_open_file(ina, filename, 10240)) { bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(ina)); bsdtar->return_value = 1; return (0); } rc = append_archive(bsdtar, a, ina); if (archive_errno(ina)) { bsdtar_warnc(bsdtar, 0, "Error reading archive %s: %s", filename, archive_error_string(ina)); bsdtar->return_value = 1; } archive_read_finish(ina); return (rc); } static int append_archive(struct bsdtar *bsdtar, struct archive *a, struct archive *ina) { struct archive_entry *in_entry; int e; while (0 == archive_read_next_header(ina, &in_entry)) { if (!new_enough(bsdtar, archive_entry_pathname(in_entry), archive_entry_stat(in_entry))) continue; if (excluded(bsdtar, archive_entry_pathname(in_entry))) continue; if (bsdtar->option_interactive && !yes("copy '%s'", archive_entry_pathname(in_entry))) continue; if (bsdtar->verbose) safe_fprintf(stderr, "a %s", archive_entry_pathname(in_entry)); siginfo_setinfo(bsdtar, "copying", archive_entry_pathname(in_entry), archive_entry_size(in_entry)); siginfo_printinfo(bsdtar, 0); e = archive_write_header(a, in_entry); if (e != ARCHIVE_OK) { if (!bsdtar->verbose) bsdtar_warnc(bsdtar, 0, "%s: %s", archive_entry_pathname(in_entry), archive_error_string(a)); else fprintf(stderr, ": %s", archive_error_string(a)); } if (e == ARCHIVE_FATAL) exit(1); if (e >= ARCHIVE_WARN) { if (archive_entry_size(in_entry) == 0) archive_read_data_skip(ina); else if (copy_file_data(bsdtar, a, ina)) exit(1); } if (bsdtar->verbose) fprintf(stderr, "\n"); } /* Note: If we got here, we saw no write errors, so return success. */ return (0); } /* Helper function to copy data between archives. */ static int copy_file_data(struct bsdtar *bsdtar, struct archive *a, struct archive *ina) { ssize_t bytes_read; ssize_t bytes_written; off_t progress = 0; bytes_read = archive_read_data(ina, bsdtar->buff, FILEDATABUFLEN); while (bytes_read > 0) { siginfo_printinfo(bsdtar, progress); bytes_written = archive_write_data(a, bsdtar->buff, bytes_read); if (bytes_written < bytes_read) { bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(a)); return (-1); } progress += bytes_written; bytes_read = archive_read_data(ina, bsdtar->buff, FILEDATABUFLEN); } return (0); } /* * Add the file or dir hierarchy named by 'path' to the archive */ static void write_hierarchy(struct bsdtar *bsdtar, struct archive *a, const char *path) { struct tree *tree; char symlink_mode = bsdtar->symlink_mode; dev_t first_dev = 0; int dev_recorded = 0; int tree_ret; tree = tree_open(path); if (!tree) { bsdtar_warnc(bsdtar, errno, "%s: Cannot open", path); bsdtar->return_value = 1; return; } while ((tree_ret = tree_next(tree))) { const char *name = tree_current_path(tree); const struct stat *st = NULL, *lst = NULL; int descend; if (tree_ret == TREE_ERROR_FATAL) bsdtar_errc(bsdtar, 1, tree_errno(tree), "%s: Unable to continue traversing directory tree", name); if (tree_ret == TREE_ERROR_DIR) { bsdtar_warnc(bsdtar, errno, "%s: Couldn't visit directory", name); bsdtar->return_value = 1; } if (tree_ret != TREE_REGULAR) continue; lst = tree_current_lstat(tree); if (lst == NULL) { /* Couldn't lstat(); must not exist. */ bsdtar_warnc(bsdtar, errno, "%s: Cannot stat", name); /* * Report an error via the exit code if the failed * path is a prefix of what the user provided via * the command line. (Testing for string equality * here won't work due to trailing '/' characters.) */ if (memcmp(name, path, strlen(name)) == 0) bsdtar->return_value = 1; continue; } if (S_ISLNK(lst->st_mode)) st = tree_current_stat(tree); /* Default: descend into any dir or symlink to dir. */ /* We'll adjust this later on. */ descend = 0; if ((st != NULL) && S_ISDIR(st->st_mode)) descend = 1; if ((lst != NULL) && S_ISDIR(lst->st_mode)) descend = 1; /* * If user has asked us not to cross mount points, * then don't descend into into a dir on a different * device. */ if (!dev_recorded) { first_dev = lst->st_dev; dev_recorded = 1; } if (bsdtar->option_dont_traverse_mounts) { if (lst != NULL && lst->st_dev != first_dev) descend = 0; } /* * If this file/dir is flagged "nodump" and we're * honoring such flags, skip this file/dir. */ #ifdef HAVE_STRUCT_STAT_ST_FLAGS /* BSD systems store flags in struct stat */ if (bsdtar->option_honor_nodump && (lst->st_flags & UF_NODUMP)) continue; #endif #if defined(EXT2_IOC_GETFLAGS) && defined(EXT2_NODUMP_FL) /* Linux uses ioctl to read flags. */ if (bsdtar->option_honor_nodump) { int fd = open(name, O_RDONLY | O_NONBLOCK); if (fd >= 0) { unsigned long fflags; int r = ioctl(fd, EXT2_IOC_GETFLAGS, &fflags); close(fd); if (r >= 0 && (fflags & EXT2_NODUMP_FL)) continue; } } #endif /* * If this file/dir is excluded by a filename * pattern, skip it. */ if (excluded(bsdtar, name)) continue; /* * If the user vetoes this file/directory, skip it. */ if (bsdtar->option_interactive && !yes("add '%s'", name)) continue; /* * If this is a dir, decide whether or not to recurse. */ if (bsdtar->option_no_subdirs) descend = 0; /* * Distinguish 'L'/'P'/'H' symlink following. */ switch(symlink_mode) { case 'H': /* 'H': After the first item, rest like 'P'. */ symlink_mode = 'P'; /* 'H': First item (from command line) like 'L'. */ /* FALLTHROUGH */ case 'L': /* 'L': Do descend through a symlink to dir. */ /* 'L': Archive symlink to file as file. */ lst = tree_current_stat(tree); /* If stat fails, we have a broken symlink; * in that case, archive the link as such. */ if (lst == NULL) lst = tree_current_lstat(tree); break; default: /* 'P': Don't descend through a symlink to dir. */ if (!S_ISDIR(lst->st_mode)) descend = 0; /* 'P': Archive symlink to file as symlink. */ /* lst = tree_current_lstat(tree); */ break; } if (descend) tree_descend(tree); #ifdef __APPLE__ const char *bname = basename((char *)name); const char *apath = tree_current_access_path(tree); if (!bsdtar->disable_copyfile && strncmp(bname, "._", 2) == 0) { continue; } // XXX: Should probably only do this for tar formats. if (!bsdtar->disable_copyfile && strncmp(bname, "._", 2) != 0) { if (copyfile(apath, NULL, 0, COPYFILE_CHECK | COPYFILE_NOFOLLOW | COPYFILE_ACL | COPYFILE_XATTR) != 0) { const char *tempdir = NULL; char *md_p = NULL; if (issetugid() == 0) tempdir = getenv("TMPDIR"); if (tempdir == NULL) tempdir = _PATH_TMP; md_p = tempnam(tempdir, "tar.md."); if (md_p != NULL) { char *copyfile_fname; struct stat copyfile_stat; asprintf(©file_fname, "%s/._%s", dirname((char *)name), bname); copyfile(apath, md_p, 0, COPYFILE_PACK | COPYFILE_NOFOLLOW | COPYFILE_ACL | COPYFILE_XATTR); stat(md_p, ©file_stat); write_entry(bsdtar, a, ©file_stat, copyfile_fname, md_p); unlink(md_p); free(copyfile_fname); } free(md_p); } } #endif /* * Write the entry. Note that write_entry() handles * pathname editing and newness testing. */ write_entry(bsdtar, a, lst, name, tree_current_access_path(tree)); } tree_close(tree); } /* * Backend for write_entry. */ static void write_entry_backend(struct bsdtar *bsdtar, struct archive *a, struct archive_entry *entry) { int fd = -1; int e; if (archive_entry_size(entry) > 0) { const char *pathname = archive_entry_sourcepath(entry); fd = open(pathname, O_RDONLY); if (fd == -1) { if (!bsdtar->verbose) bsdtar_warnc(bsdtar, errno, "%s: could not open file", pathname); else fprintf(stderr, ": %s", strerror(errno)); return; } } e = archive_write_header(a, entry); if (e != ARCHIVE_OK) { if (!bsdtar->verbose) bsdtar_warnc(bsdtar, 0, "%s: %s", archive_entry_pathname(entry), archive_error_string(a)); else fprintf(stderr, ": %s", archive_error_string(a)); } if (e == ARCHIVE_FATAL) exit(1); /* * If we opened a file earlier, write it out now. Note that * the format handler might have reset the size field to zero * to inform us that the archive body won't get stored. In * that case, just skip the write. */ if (e >= ARCHIVE_WARN && fd >= 0 && archive_entry_size(entry) > 0) { if (write_file_data(bsdtar, a, entry, fd)) exit(1); } /* * If we opened a file, close it now even if there was an error * which made us decide not to write the archive body. */ if (fd >= 0) close(fd); } /* * Add a single filesystem object to the archive. */ static void write_entry(struct bsdtar *bsdtar, struct archive *a, const struct stat *st, const char *pathname, const char *accpath) { struct archive_entry *entry, *sparse_entry; static char linkbuffer[PATH_MAX+1]; entry = archive_entry_new(); archive_entry_set_pathname(entry, pathname); archive_entry_copy_sourcepath(entry, accpath); /* * Rewrite the pathname to be archived. If rewrite * fails, skip the entry. */ if (edit_pathname(bsdtar, entry)) goto abort; /* * In -u mode, check that the file is newer than what's * already in the archive; in all modes, obey --newerXXX flags. */ if (!new_enough(bsdtar, archive_entry_pathname(entry), st)) goto abort; /* Display entry as we process it. This format is required by SUSv2. */ if (bsdtar->verbose) safe_fprintf(stderr, "a %s", archive_entry_pathname(entry)); /* Read symbolic link information. */ if ((st->st_mode & S_IFMT) == S_IFLNK) { int lnklen; lnklen = readlink(accpath, linkbuffer, PATH_MAX); if (lnklen < 0) { if (!bsdtar->verbose) bsdtar_warnc(bsdtar, errno, "%s: Couldn't read symbolic link", pathname); else safe_fprintf(stderr, ": Couldn't read symbolic link: %s", strerror(errno)); goto cleanup; } linkbuffer[lnklen] = 0; archive_entry_set_symlink(entry, linkbuffer); } /* Look up username and group name. */ archive_entry_set_uname(entry, lookup_uname(bsdtar, st->st_uid)); archive_entry_set_gname(entry, lookup_gname(bsdtar, st->st_gid)); #ifdef HAVE_STRUCT_STAT_ST_FLAGS /* XXX TODO: archive_entry_copy_stat() should copy st_flags * on platforms that support it. This should go away then. */ if (st->st_flags != 0) archive_entry_set_fflags(entry, st->st_flags, 0); #endif #ifdef EXT2_IOC_GETFLAGS /* XXX TODO: Find a way to merge this with the * flags fetch for nodump support earlier. */ if ((S_ISREG(st->st_mode) || S_ISDIR(st->st_mode))) { int fd = open(accpath, O_RDONLY | O_NONBLOCK); if (fd >= 0) { unsigned long stflags; int r = ioctl(fd, EXT2_IOC_GETFLAGS, &stflags); close(fd); if (r == 0 && stflags != 0) archive_entry_set_fflags(entry, stflags, 0); } } #endif archive_entry_copy_stat(entry, st); setup_acls(bsdtar, entry, accpath); setup_xattrs(bsdtar, entry, accpath); /* Non-regular files get archived with zero size. */ if (!S_ISREG(st->st_mode)) archive_entry_set_size(entry, 0); /* Record what we're doing, for the benefit of SIGINFO / SIGUSR1. */ siginfo_setinfo(bsdtar, "adding", archive_entry_pathname(entry), archive_entry_size(entry)); archive_entry_linkify(bsdtar->resolver, &entry, &sparse_entry); /* Handle SIGINFO / SIGUSR1 request if one was made. */ siginfo_printinfo(bsdtar, 0); while (entry != NULL) { write_entry_backend(bsdtar, a, entry); archive_entry_free(entry); entry = sparse_entry; sparse_entry = NULL; } cleanup: if (bsdtar->verbose) fprintf(stderr, "\n"); abort: if (entry != NULL) archive_entry_free(entry); } /* Helper function to copy file to archive. */ static int write_file_data(struct bsdtar *bsdtar, struct archive *a, struct archive_entry *entry, int fd) { ssize_t bytes_read; ssize_t bytes_written; off_t progress = 0; bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN); while (bytes_read > 0) { siginfo_printinfo(bsdtar, progress); bytes_written = archive_write_data(a, bsdtar->buff, bytes_read); if (bytes_written < 0) { /* Write failed; this is bad */ bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(a)); return (-1); } if (bytes_written < bytes_read) { /* Write was truncated; warn but continue. */ bsdtar_warnc(bsdtar, 0, "%s: Truncated write; file may have grown while being archived.", archive_entry_pathname(entry)); return (0); } progress += bytes_written; bytes_read = read(fd, bsdtar->buff, FILEDATABUFLEN); } return 0; } static void create_cleanup(struct bsdtar *bsdtar) { free_cache(bsdtar->uname_cache); bsdtar->uname_cache = NULL; free_cache(bsdtar->gname_cache); bsdtar->gname_cache = NULL; } #ifdef HAVE_POSIX_ACL static void setup_acl(struct bsdtar *bsdtar, struct archive_entry *entry, const char *accpath, int acl_type, int archive_entry_acl_type); static void setup_acls(struct bsdtar *bsdtar, struct archive_entry *entry, const char *accpath) { archive_entry_acl_clear(entry); setup_acl(bsdtar, entry, accpath, ACL_TYPE_ACCESS, ARCHIVE_ENTRY_ACL_TYPE_ACCESS); /* Only directories can have default ACLs. */ if (S_ISDIR(archive_entry_mode(entry))) setup_acl(bsdtar, entry, accpath, ACL_TYPE_DEFAULT, ARCHIVE_ENTRY_ACL_TYPE_DEFAULT); } static void setup_acl(struct bsdtar *bsdtar, struct archive_entry *entry, const char *accpath, int acl_type, int archive_entry_acl_type) { acl_t acl; acl_tag_t acl_tag; acl_entry_t acl_entry; acl_permset_t acl_permset; int s, ae_id, ae_tag, ae_perm; const char *ae_name; /* Retrieve access ACL from file. */ acl = acl_get_file(accpath, acl_type); if (acl != NULL) { s = acl_get_entry(acl, ACL_FIRST_ENTRY, &acl_entry); while (s == 1) { ae_id = -1; ae_name = NULL; acl_get_tag_type(acl_entry, &acl_tag); if (acl_tag == ACL_USER) { ae_id = (int)*(uid_t *)acl_get_qualifier(acl_entry); ae_name = lookup_uname(bsdtar, ae_id); ae_tag = ARCHIVE_ENTRY_ACL_USER; } else if (acl_tag == ACL_GROUP) { ae_id = (int)*(gid_t *)acl_get_qualifier(acl_entry); ae_name = lookup_gname(bsdtar, ae_id); ae_tag = ARCHIVE_ENTRY_ACL_GROUP; } else if (acl_tag == ACL_MASK) { ae_tag = ARCHIVE_ENTRY_ACL_MASK; } else if (acl_tag == ACL_USER_OBJ) { ae_tag = ARCHIVE_ENTRY_ACL_USER_OBJ; } else if (acl_tag == ACL_GROUP_OBJ) { ae_tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ; } else if (acl_tag == ACL_OTHER) { ae_tag = ARCHIVE_ENTRY_ACL_OTHER; } else { /* Skip types that libarchive can't support. */ continue; } acl_get_permset(acl_entry, &acl_permset); ae_perm = 0; /* * acl_get_perm() is spelled differently on different * platforms; see bsdtar_platform.h for details. */ if (ACL_GET_PERM(acl_permset, ACL_EXECUTE)) ae_perm |= ARCHIVE_ENTRY_ACL_EXECUTE; if (ACL_GET_PERM(acl_permset, ACL_READ)) ae_perm |= ARCHIVE_ENTRY_ACL_READ; if (ACL_GET_PERM(acl_permset, ACL_WRITE)) ae_perm |= ARCHIVE_ENTRY_ACL_WRITE; archive_entry_acl_add_entry(entry, archive_entry_acl_type, ae_perm, ae_tag, ae_id, ae_name); s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry); } acl_free(acl); } } #else static void setup_acls(struct bsdtar *bsdtar, struct archive_entry *entry, const char *accpath) { (void)bsdtar; (void)entry; (void)accpath; } #endif #if HAVE_LISTXATTR && HAVE_LLISTXATTR && HAVE_GETXATTR && HAVE_LGETXATTR static void setup_xattr(struct bsdtar *bsdtar, struct archive_entry *entry, const char *accpath, const char *name) { size_t size; void *value = NULL; char symlink_mode = bsdtar->symlink_mode; if (symlink_mode == 'H') size = getxattr(accpath, name, NULL, 0); else size = lgetxattr(accpath, name, NULL, 0); if (size == -1) { bsdtar_warnc(bsdtar, errno, "Couldn't get extended attribute"); return; } if (size > 0 && (value = malloc(size)) == NULL) { bsdtar_errc(bsdtar, 1, errno, "Out of memory"); return; } if (symlink_mode == 'H') size = getxattr(accpath, name, value, size); else size = lgetxattr(accpath, name, value, size); if (size == -1) { bsdtar_warnc(bsdtar, errno, "Couldn't get extended attribute"); return; } archive_entry_xattr_add_entry(entry, name, value, size); free(value); } /* * Linux extended attribute support */ static void setup_xattrs(struct bsdtar *bsdtar, struct archive_entry *entry, const char *accpath) { char *list, *p; size_t list_size; char symlink_mode = bsdtar->symlink_mode; if (symlink_mode == 'H') list_size = listxattr(accpath, NULL, 0); else list_size = llistxattr(accpath, NULL, 0); if (list_size == -1) { bsdtar_warnc(bsdtar, errno, "Couldn't list extended attributes"); return; } else if (list_size == 0) return; if ((list = malloc(list_size)) == NULL) { bsdtar_errc(bsdtar, 1, errno, "Out of memory"); return; } if (symlink_mode == 'H') list_size = listxattr(accpath, list, list_size); else list_size = llistxattr(accpath, list, list_size); if (list_size == -1) { bsdtar_warnc(bsdtar, errno, "Couldn't list extended attributes"); free(list); return; } for (p = list; (p - list) < list_size; p += strlen(p) + 1) { if (strncmp(p, "system.", 7) == 0 || strncmp(p, "xfsroot.", 8) == 0) continue; setup_xattr(bsdtar, entry, accpath, p); } free(list); } #else /* * Generic (stub) extended attribute support. */ static void setup_xattrs(struct bsdtar *bsdtar, struct archive_entry *entry, const char *accpath) { (void)bsdtar; /* UNUSED */ (void)entry; /* UNUSED */ (void)accpath; /* UNUSED */ } #endif static void free_cache(struct name_cache *cache) { size_t i; if (cache != NULL) { for (i = 0; i < cache->size; i++) { if (cache->cache[i].name != NULL && cache->cache[i].name != NO_NAME) free((void *)(uintptr_t)cache->cache[i].name); } free(cache); } } /* * Lookup uid/gid from uname/gname, return NULL if no match. */ static const char * lookup_name(struct bsdtar *bsdtar, struct name_cache **name_cache_variable, int (*lookup_fn)(struct bsdtar *, const char **, id_t), id_t id) { struct name_cache *cache; const char *name; int slot; if (*name_cache_variable == NULL) { *name_cache_variable = malloc(sizeof(struct name_cache)); if (*name_cache_variable == NULL) bsdtar_errc(bsdtar, 1, ENOMEM, "No more memory"); memset(*name_cache_variable, 0, sizeof(struct name_cache)); (*name_cache_variable)->size = name_cache_size; } cache = *name_cache_variable; cache->probes++; slot = id % cache->size; if (cache->cache[slot].name != NULL) { if (cache->cache[slot].id == id) { cache->hits++; if (cache->cache[slot].name == NO_NAME) return (NULL); return (cache->cache[slot].name); } if (cache->cache[slot].name != NO_NAME) free((void *)(uintptr_t)cache->cache[slot].name); cache->cache[slot].name = NULL; } if (lookup_fn(bsdtar, &name, id) == 0) { if (name == NULL || name[0] == '\0') { /* Cache the negative response. */ cache->cache[slot].name = NO_NAME; cache->cache[slot].id = id; } else { cache->cache[slot].name = strdup(name); if (cache->cache[slot].name != NULL) { cache->cache[slot].id = id; return (cache->cache[slot].name); } /* * Conveniently, NULL marks an empty slot, so * if the strdup() fails, we've just failed to * cache it. No recovery necessary. */ } } return (NULL); } static const char * lookup_uname(struct bsdtar *bsdtar, uid_t uid) { return (lookup_name(bsdtar, &bsdtar->uname_cache, &lookup_uname_helper, (id_t)uid)); } static int lookup_uname_helper(struct bsdtar *bsdtar, const char **name, id_t id) { struct passwd *pwent; (void)bsdtar; /* UNUSED */ errno = 0; pwent = getpwuid((uid_t)id); if (pwent == NULL) { *name = NULL; if (errno != 0) bsdtar_warnc(bsdtar, errno, "getpwuid(%d) failed", id); return (errno); } *name = pwent->pw_name; return (0); } static const char * lookup_gname(struct bsdtar *bsdtar, gid_t gid) { return (lookup_name(bsdtar, &bsdtar->gname_cache, &lookup_gname_helper, (id_t)gid)); } static int lookup_gname_helper(struct bsdtar *bsdtar, const char **name, id_t id) { struct group *grent; (void)bsdtar; /* UNUSED */ errno = 0; grent = getgrgid((gid_t)id); if (grent == NULL) { *name = NULL; if (errno != 0) bsdtar_warnc(bsdtar, errno, "getgrgid(%d) failed", id); return (errno); } *name = grent->gr_name; return (0); } /* * Test if the specified file is new enough to include in the archive. */ int new_enough(struct bsdtar *bsdtar, const char *path, const struct stat *st) { struct archive_dir_entry *p; /* * If this file/dir is excluded by a time comparison, skip it. */ if (bsdtar->newer_ctime_sec > 0) { if (st->st_ctime < bsdtar->newer_ctime_sec) return (0); /* Too old, skip it. */ if (st->st_ctime == bsdtar->newer_ctime_sec && ARCHIVE_STAT_CTIME_NANOS(st) <= bsdtar->newer_ctime_nsec) return (0); /* Too old, skip it. */ } if (bsdtar->newer_mtime_sec > 0) { if (st->st_mtime < bsdtar->newer_mtime_sec) return (0); /* Too old, skip it. */ if (st->st_mtime == bsdtar->newer_mtime_sec && ARCHIVE_STAT_MTIME_NANOS(st) <= bsdtar->newer_mtime_nsec) return (0); /* Too old, skip it. */ } /* * In -u mode, we only write an entry if it's newer than * what was already in the archive. */ if (bsdtar->archive_dir != NULL && bsdtar->archive_dir->head != NULL) { for (p = bsdtar->archive_dir->head; p != NULL; p = p->next) { if (pathcmp(path, p->name)==0) return (p->mtime_sec < st->st_mtime || (p->mtime_sec == st->st_mtime && p->mtime_nsec < ARCHIVE_STAT_MTIME_NANOS(st))); } } /* If the file wasn't rejected, include it. */ return (1); } /* * Add an entry to the dir list for 'u' mode. * * XXX TODO: Make this fast. */ static void add_dir_list(struct bsdtar *bsdtar, const char *path, time_t mtime_sec, int mtime_nsec) { struct archive_dir_entry *p; /* * Search entire list to see if this file has appeared before. * If it has, override the timestamp data. */ p = bsdtar->archive_dir->head; while (p != NULL) { if (strcmp(path, p->name)==0) { p->mtime_sec = mtime_sec; p->mtime_nsec = mtime_nsec; return; } p = p->next; } p = malloc(sizeof(*p)); if (p == NULL) bsdtar_errc(bsdtar, 1, ENOMEM, "Can't read archive directory"); p->name = strdup(path); if (p->name == NULL) bsdtar_errc(bsdtar, 1, ENOMEM, "Can't read archive directory"); p->mtime_sec = mtime_sec; p->mtime_nsec = mtime_nsec; p->next = NULL; if (bsdtar->archive_dir->tail == NULL) { bsdtar->archive_dir->head = bsdtar->archive_dir->tail = p; } else { bsdtar->archive_dir->tail->next = p; bsdtar->archive_dir->tail = p; } } void test_for_append(struct bsdtar *bsdtar) { struct stat s; if (*bsdtar->argv == NULL && bsdtar->names_from_file == NULL) bsdtar_errc(bsdtar, 1, 0, "no files or directories specified"); if (bsdtar->filename == NULL) bsdtar_errc(bsdtar, 1, 0, "Cannot append to stdout."); if (bsdtar->create_compression != 0) bsdtar_errc(bsdtar, 1, 0, "Cannot append to %s with compression", bsdtar->filename); if (stat(bsdtar->filename, &s) != 0) return; if (!S_ISREG(s.st_mode) && !S_ISBLK(s.st_mode)) bsdtar_errc(bsdtar, 1, 0, "Cannot append to %s: not a regular file.", bsdtar->filename); }