Ejemplo n.º 1
0
int
main(int argc, char **argv)
{
	struct bsdtar		*bsdtar, bsdtar_storage;
	int			 opt, t;
	char			 compression, compression2;
	const char		*compression_name, *compression2_name;
	const char		*compress_program;
	char			 option_a, option_o;
	char			 possible_help_request;
	char			 buff[16];

	/*
	 * Use a pointer for consistency, but stack-allocated storage
	 * for ease of cleanup.
	 */
	bsdtar = &bsdtar_storage;
	memset(bsdtar, 0, sizeof(*bsdtar));
	bsdtar->fd = -1; /* Mark as "unused" */
	bsdtar->gid = -1;
	bsdtar->uid = -1;
	option_a = option_o = 0;
	compression = compression2 = '\0';
	compression_name = compression2_name = NULL;
	compress_program = NULL;

#if defined(HAVE_SIGACTION)
	{ /* Set up signal handling. */
		struct sigaction sa;
		sa.sa_handler = siginfo_handler;
		sigemptyset(&sa.sa_mask);
		sa.sa_flags = 0;
#ifdef SIGINFO
		if (sigaction(SIGINFO, &sa, NULL))
			lafe_errc(1, errno, "sigaction(SIGINFO) failed");
#endif
#ifdef SIGUSR1
		/* ... and treat SIGUSR1 the same way as SIGINFO. */
		if (sigaction(SIGUSR1, &sa, NULL))
			lafe_errc(1, errno, "sigaction(SIGUSR1) failed");
#endif
#ifdef SIGPIPE
		/* Ignore SIGPIPE signals. */
		sa.sa_handler = SIG_IGN;
		sigaction(SIGPIPE, &sa, NULL);
#endif
	}
#endif

	/* Set lafe_progname before calling lafe_warnc. */
	lafe_setprogname(*argv, "bsdtar");

#if HAVE_SETLOCALE
	if (setlocale(LC_ALL, "") == NULL)
		lafe_warnc(0, "Failed to set default locale");
#endif
#if defined(HAVE_NL_LANGINFO) && defined(HAVE_D_MD_ORDER)
	bsdtar->day_first = (*nl_langinfo(D_MD_ORDER) == 'd');
#endif
	possible_help_request = 0;

	/* Look up uid of current user for future reference */
	bsdtar->user_uid = geteuid();

	/* Default: open tape drive. */
	bsdtar->filename = getenv("TAPE");
	if (bsdtar->filename == NULL)
		bsdtar->filename = _PATH_DEFTAPE;

	/* Default block size settings. */
	bsdtar->bytes_per_block = DEFAULT_BYTES_PER_BLOCK;
	/* Allow library to default this unless user specifies -b. */
	bsdtar->bytes_in_last_block = -1;

	/* Default: preserve mod time on extract */
	bsdtar->extract_flags = ARCHIVE_EXTRACT_TIME;

	/* Default: Perform basic security checks. */
	bsdtar->extract_flags |= SECURITY;

#ifndef _WIN32
	/* On POSIX systems, assume --same-owner and -p when run by
	 * the root user.  This doesn't make any sense on Windows. */
	if (bsdtar->user_uid == 0) {
		/* --same-owner */
		bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
		/* -p */
		bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
		bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
		bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
		bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
		bsdtar->extract_flags |= ARCHIVE_EXTRACT_MAC_METADATA;
	}
#endif

	/*
	 * Enable Mac OS "copyfile()" extension by default.
	 * This has no effect on other platforms.
	 */
	bsdtar->readdisk_flags |= ARCHIVE_READDISK_MAC_COPYFILE;
#ifdef COPYFILE_DISABLE_VAR
	if (getenv(COPYFILE_DISABLE_VAR))
		bsdtar->readdisk_flags &= ~ARCHIVE_READDISK_MAC_COPYFILE;
#endif
	bsdtar->matching = archive_match_new();
	if (bsdtar->matching == NULL)
		lafe_errc(1, errno, "Out of memory");
	bsdtar->cset = cset_new();
	if (bsdtar->cset == NULL)
		lafe_errc(1, errno, "Out of memory");

	bsdtar->argv = argv;
	bsdtar->argc = argc;

	/*
	 * Comments following each option indicate where that option
	 * originated:  SUSv2, POSIX, GNU tar, star, etc.  If there's
	 * no such comment, then I don't know of anyone else who
	 * implements that option.
	 */
	while ((opt = bsdtar_getopt(bsdtar)) != -1) {
		switch (opt) {
		case 'a': /* GNU tar */
			option_a = 1; /* Record it and resolve it later. */
			break;
		case 'B': /* GNU tar */
			/* libarchive doesn't need this; just ignore it. */
			break;
		case 'b': /* SUSv2 */
			t = atoi(bsdtar->argument);
			if (t <= 0 || t > 8192)
				lafe_errc(1, 0,
				    "Argument to -b is out of range (1..8192)");
			bsdtar->bytes_per_block = 512 * t;
			/* Explicit -b forces last block size. */
			bsdtar->bytes_in_last_block = bsdtar->bytes_per_block;
			break;
		case OPTION_B64ENCODE:
			if (compression2 != '\0')
				lafe_errc(1, 0,
				    "Can't specify both --uuencode and "
				    "--b64encode");
			compression2 = opt;
			compression2_name = "b64encode";
			break;
		case 'C': /* GNU tar */
			if (strlen(bsdtar->argument) == 0)
				lafe_errc(1, 0,
				    "Meaningless option: -C ''");

			set_chdir(bsdtar, bsdtar->argument);
			break;
		case 'c': /* SUSv2 */
			set_mode(bsdtar, opt);
			break;
		case OPTION_CHECK_LINKS: /* GNU tar */
			bsdtar->option_warn_links = 1;
			break;
		case OPTION_CHROOT: /* NetBSD */
			bsdtar->option_chroot = 1;
			break;
		case OPTION_DISABLE_COPYFILE: /* Mac OS X */
			bsdtar->readdisk_flags &= ~ARCHIVE_READDISK_MAC_COPYFILE;
			break;
		case OPTION_EXCLUDE: /* GNU tar */
			if (archive_match_exclude_pattern(
			    bsdtar->matching, bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0,
				    "Couldn't exclude %s\n", bsdtar->argument);
			break;
		case OPTION_FORMAT: /* GNU tar, others */
			cset_set_format(bsdtar->cset, bsdtar->argument);
			break;
		case 'f': /* SUSv2 */
			bsdtar->filename = bsdtar->argument;
			break;
		case OPTION_GID: /* cpio */
			t = atoi(bsdtar->argument);
			if (t < 0)
				lafe_errc(1, 0,
				    "Argument to --gid must be positive");
			bsdtar->gid = t;
			break;
		case OPTION_GNAME: /* cpio */
			bsdtar->gname = bsdtar->argument;
			break;
		case OPTION_GRZIP:
			if (compression != '\0')
				lafe_errc(1, 0,
				    "Can't specify both -%c and -%c", opt,
				    compression);
			compression = opt;
			compression_name = "grzip";
			break;
		case 'H': /* BSD convention */
			bsdtar->symlink_mode = 'H';
			break;
		case 'h': /* Linux Standards Base, gtar; synonym for -L */
			bsdtar->symlink_mode = 'L';
			/* Hack: -h by itself is the "help" command. */
			possible_help_request = 1;
			break;
		case OPTION_HELP: /* GNU tar, others */
			long_help();
			exit(0);
			break;
		case OPTION_HFS_COMPRESSION: /* Mac OS X v10.6 or later */
			bsdtar->extract_flags |=
			    ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED;
			break;
		case OPTION_IGNORE_ZEROS:
			bsdtar->option_ignore_zeros = 1;
			break;
		case 'I': /* GNU tar */
			/*
			 * TODO: Allow 'names' to come from an archive,
			 * not just a text file.  Design a good UI for
			 * allowing names and mode/owner to be read
			 * from an archive, with contents coming from
			 * disk.  This can be used to "refresh" an
			 * archive or to design archives with special
			 * permissions without having to create those
			 * permissions on disk.
			 */
			bsdtar->names_from_file = bsdtar->argument;
			break;
		case OPTION_INCLUDE:
			/*
			 * No one else has the @archive extension, so
			 * no one else needs this to filter entries
			 * when transforming archives.
			 */
			if (archive_match_include_pattern(bsdtar->matching,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0,
				    "Failed to add %s to inclusion list",
				    bsdtar->argument);
			break;
		case 'j': /* GNU tar */
			if (compression != '\0')
				lafe_errc(1, 0,
				    "Can't specify both -%c and -%c", opt,
				    compression);
			compression = opt;
			compression_name = "bzip2";
			break;
		case 'J': /* GNU tar 1.21 and later */
			if (compression != '\0')
				lafe_errc(1, 0,
				    "Can't specify both -%c and -%c", opt,
				    compression);
			compression = opt;
			compression_name = "xz";
			break;
		case 'k': /* GNU tar */
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE;
			break;
		case OPTION_KEEP_NEWER_FILES: /* GNU tar */
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
			break;
		case 'L': /* BSD convention */
			bsdtar->symlink_mode = 'L';
			break;
	        case 'l': /* SUSv2 and GNU tar beginning with 1.16 */
			/* GNU tar 1.13  used -l for --one-file-system */
			bsdtar->option_warn_links = 1;
			break;
		case OPTION_LRZIP:
		case OPTION_LZ4:
		case OPTION_LZIP: /* GNU tar beginning with 1.23 */
		case OPTION_LZMA: /* GNU tar beginning with 1.20 */
		case OPTION_LZOP: /* GNU tar beginning with 1.21 */
			if (compression != '\0')
				lafe_errc(1, 0,
				    "Can't specify both -%c and -%c", opt,
				    compression);
			compression = opt;
			switch (opt) {
			case OPTION_LRZIP: compression_name = "lrzip"; break;
			case OPTION_LZ4:  compression_name = "lz4"; break;
			case OPTION_LZIP: compression_name = "lzip"; break; 
			case OPTION_LZMA: compression_name = "lzma"; break; 
			case OPTION_LZOP: compression_name = "lzop"; break; 
			}
			break;
		case 'm': /* SUSv2 */
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_TIME;
			break;
		case 'n': /* GNU tar */
			bsdtar->option_no_subdirs = 1;
			break;
	        /*
		 * Selecting files by time:
		 *    --newer-?time='date' Only files newer than 'date'
		 *    --newer-?time-than='file' Only files newer than time
		 *         on specified file (useful for incremental backups)
		 */
		case OPTION_NEWER_CTIME: /* GNU tar */
			if (archive_match_include_date(bsdtar->matching,
			    ARCHIVE_MATCH_CTIME | ARCHIVE_MATCH_NEWER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_NEWER_CTIME_THAN:
			if (archive_match_include_file_time(bsdtar->matching,
			    ARCHIVE_MATCH_CTIME | ARCHIVE_MATCH_NEWER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_NEWER_MTIME: /* GNU tar */
			if (archive_match_include_date(bsdtar->matching,
			    ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_NEWER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_NEWER_MTIME_THAN:
			if (archive_match_include_file_time(bsdtar->matching,
			    ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_NEWER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_NODUMP: /* star */
			bsdtar->readdisk_flags |= ARCHIVE_READDISK_HONOR_NODUMP;
			break;
		case OPTION_NOPRESERVE_HFS_COMPRESSION:
			/* Mac OS X v10.6 or later */
			bsdtar->extract_flags |=
			    ARCHIVE_EXTRACT_NO_HFS_COMPRESSION;
			break;
		case OPTION_NO_SAME_OWNER: /* GNU tar */
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
			break;
		case OPTION_NO_SAME_PERMISSIONS: /* GNU tar */
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_PERM;
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_ACL;
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_XATTR;
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_FFLAGS;
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_MAC_METADATA;
			break;
		case OPTION_NULL: /* GNU tar */
			bsdtar->option_null++;
			break;
		case OPTION_NUMERIC_OWNER: /* GNU tar */
			bsdtar->uname = "";
			bsdtar->gname = "";
			bsdtar->option_numeric_owner++;
			break;
		case 'O': /* GNU tar */
			bsdtar->option_stdout = 1;
			break;
		case 'o': /* SUSv2 and GNU conflict here, but not fatally */
			option_o = 1; /* Record it and resolve it later. */
			break;
	        /*
		 * Selecting files by time:
		 *    --older-?time='date' Only files older than 'date'
		 *    --older-?time-than='file' Only files older than time
		 *         on specified file
		 */
		case OPTION_OLDER_CTIME:
			if (archive_match_include_date(bsdtar->matching,
			    ARCHIVE_MATCH_CTIME | ARCHIVE_MATCH_OLDER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_OLDER_CTIME_THAN:
			if (archive_match_include_file_time(bsdtar->matching,
			    ARCHIVE_MATCH_CTIME | ARCHIVE_MATCH_OLDER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_OLDER_MTIME:
			if (archive_match_include_date(bsdtar->matching,
			    ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_OLDER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_OLDER_MTIME_THAN:
			if (archive_match_include_file_time(bsdtar->matching,
			    ARCHIVE_MATCH_MTIME | ARCHIVE_MATCH_OLDER,
			    bsdtar->argument) != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case OPTION_ONE_FILE_SYSTEM: /* GNU tar */
			bsdtar->readdisk_flags |=
			    ARCHIVE_READDISK_NO_TRAVERSE_MOUNTS;
			break;
		case OPTION_OPTIONS:
			bsdtar->option_options = bsdtar->argument;
			break;
#if 0
		/*
		 * The common BSD -P option is not necessary, since
		 * our default is to archive symlinks, not follow
		 * them.  This is convenient, as -P conflicts with GNU
		 * tar anyway.
		 */
		case 'P': /* BSD convention */
			/* Default behavior, no option necessary. */
			break;
#endif
		case 'P': /* GNU tar */
			bsdtar->extract_flags &= ~SECURITY;
			bsdtar->option_absolute_paths = 1;
			break;
		case 'p': /* GNU tar, star */
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_MAC_METADATA;
			break;
		case OPTION_PASSPHRASE:
			bsdtar->passphrase = bsdtar->argument;
			break;
		case OPTION_POSIX: /* GNU tar */
			cset_set_format(bsdtar->cset, "pax");
			break;
		case 'q': /* FreeBSD GNU tar --fast-read, NetBSD -q */
			bsdtar->option_fast_read = 1;
			break;
		case 'r': /* SUSv2 */
			set_mode(bsdtar, opt);
			break;
		case 'S': /* NetBSD pax-as-tar */
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_SPARSE;
			break;
		case 's': /* NetBSD pax-as-tar */
#if defined(HAVE_REGEX_H) || defined(HAVE_PCREPOSIX_H)
			add_substitution(bsdtar, bsdtar->argument);
#else
			lafe_warnc(0,
			    "-s is not supported by this version of bsdtar");
			usage();
#endif
			break;
		case OPTION_SAME_OWNER: /* GNU tar */
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
			break;
		case OPTION_STRIP_COMPONENTS: /* GNU tar 1.15 */
			errno = 0;
			bsdtar->strip_components = strtol(bsdtar->argument,
			    NULL, 0);
			if (errno)
				lafe_errc(1, 0,
				    "Invalid --strip-components argument: %s",
				    bsdtar->argument);
			break;
		case 'T': /* GNU tar */
			bsdtar->names_from_file = bsdtar->argument;
			break;
		case 't': /* SUSv2 */
			set_mode(bsdtar, opt);
			bsdtar->verbose++;
			break;
		case OPTION_TOTALS: /* GNU tar */
			bsdtar->option_totals++;
			break;
		case 'U': /* GNU tar */
			bsdtar->extract_flags |= ARCHIVE_EXTRACT_UNLINK;
			bsdtar->option_unlink_first = 1;
			break;
		case 'u': /* SUSv2 */
			set_mode(bsdtar, opt);
			break;
		case OPTION_UID: /* cpio */
			t = atoi(bsdtar->argument);
			if (t < 0)
				lafe_errc(1, 0,
				    "Argument to --uid must be positive");
			bsdtar->uid = t;
			break;
		case OPTION_UNAME: /* cpio */
			bsdtar->uname = bsdtar->argument;
			break;
		case OPTION_UUENCODE:
			if (compression2 != '\0')
				lafe_errc(1, 0,
				    "Can't specify both --uuencode and "
				    "--b64encode");
			compression2 = opt;
			compression2_name = "uuencode";
			break;
		case 'v': /* SUSv2 */
			bsdtar->verbose++;
			break;
		case OPTION_VERSION: /* GNU convention */
			version();
			break;
#if 0
		/*
		 * The -W longopt feature is handled inside of
		 * bsdtar_getopt(), so -W is not available here.
		 */
		case 'W': /* Obscure GNU convention. */
			break;
#endif
		case 'w': /* SUSv2 */
			bsdtar->option_interactive = 1;
			break;
		case 'X': /* GNU tar */
			if (archive_match_exclude_pattern_from_file(
			    bsdtar->matching, bsdtar->argument, 0)
			    != ARCHIVE_OK)
				lafe_errc(1, 0, "Error : %s",
				    archive_error_string(bsdtar->matching));
			break;
		case 'x': /* SUSv2 */
			set_mode(bsdtar, opt);
			break;
		case 'y': /* FreeBSD version of GNU tar */
			if (compression != '\0')
				lafe_errc(1, 0,
				    "Can't specify both -%c and -%c", opt,
				    compression);
			compression = opt;
			compression_name = "bzip2";
			break;
		case 'Z': /* GNU tar */
			if (compression != '\0')
				lafe_errc(1, 0,
				    "Can't specify both -%c and -%c", opt,
				    compression);
			compression = opt;
			compression_name = "compress";
			break;
		case 'z': /* GNU tar, star, many others */
			if (compression != '\0')
				lafe_errc(1, 0,
				    "Can't specify both -%c and -%c", opt,
				    compression);
			compression = opt;
			compression_name = "gzip";
			break;
		case OPTION_USE_COMPRESS_PROGRAM:
			compress_program = bsdtar->argument;
			break;
		default:
			usage();
		}
	}

	/*
	 * Sanity-check options.
	 */

	/* If no "real" mode was specified, treat -h as --help. */
	if ((bsdtar->mode == '\0') && possible_help_request) {
		long_help();
		exit(0);
	}

	/* Otherwise, a mode is required. */
	if (bsdtar->mode == '\0')
		lafe_errc(1, 0,
		    "Must specify one of -c, -r, -t, -u, -x");

	/* Check boolean options only permitted in certain modes. */
	if (option_a)
		only_mode(bsdtar, "-a", "c");
	if (bsdtar->readdisk_flags & ARCHIVE_READDISK_NO_TRAVERSE_MOUNTS)
		only_mode(bsdtar, "--one-file-system", "cru");
	if (bsdtar->option_fast_read)
		only_mode(bsdtar, "--fast-read", "xt");
	if (bsdtar->extract_flags & ARCHIVE_EXTRACT_HFS_COMPRESSION_FORCED)
		only_mode(bsdtar, "--hfsCompression", "x");
	if (bsdtar->extract_flags & ARCHIVE_EXTRACT_NO_HFS_COMPRESSION)
		only_mode(bsdtar, "--nopreserveHFSCompression", "x");
	if (bsdtar->readdisk_flags & ARCHIVE_READDISK_HONOR_NODUMP)
		only_mode(bsdtar, "--nodump", "cru");
	if (option_o > 0) {
		switch (bsdtar->mode) {
		case 'c':
			/*
			 * In GNU tar, -o means "old format."  The
			 * "ustar" format is the closest thing
			 * supported by libarchive.
			 */
			cset_set_format(bsdtar->cset, "ustar");
			/* TODO: bsdtar->create_format = "v7"; */
			break;
		case 'x':
			/* POSIX-compatible behavior. */
			bsdtar->option_no_owner = 1;
			bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
			break;
		default:
			only_mode(bsdtar, "-o", "xc");
			break;
		}
	}
	if (bsdtar->option_no_subdirs)
		only_mode(bsdtar, "-n", "cru");
	if (bsdtar->option_stdout)
		only_mode(bsdtar, "-O", "xt");
	if (bsdtar->option_unlink_first)
		only_mode(bsdtar, "-U", "x");
	if (bsdtar->option_warn_links)
		only_mode(bsdtar, "--check-links", "cr");

	if (option_a && cset_auto_compress(bsdtar->cset, bsdtar->filename)) {
		/* Ignore specified compressions if auto-compress works. */
		compression = '\0';
		compression2 = '\0';
	}
	/* Check other parameters only permitted in certain modes. */
	if (compress_program != NULL) {
		only_mode(bsdtar, "--use-compress-program", "cxt");
		cset_add_filter_program(bsdtar->cset, compress_program);
		/* Ignore specified compressions. */
		compression = '\0';
		compression2 = '\0';
	}
	if (compression != '\0') {
		switch (compression) {
		case 'J': case 'j': case 'y': case 'Z': case 'z':
			strcpy(buff, "-?");
			buff[1] = compression;
			break;
		default:
			strcpy(buff, "--");
			strcat(buff, compression_name);
			break;
		}
		only_mode(bsdtar, buff, "cxt");
		cset_add_filter(bsdtar->cset, compression_name);
	}
	if (compression2 != '\0') {
		strcpy(buff, "--");
		strcat(buff, compression2_name);
		only_mode(bsdtar, buff, "cxt");
		cset_add_filter(bsdtar->cset, compression2_name);
	}
	if (cset_get_format(bsdtar->cset) != NULL)
		only_mode(bsdtar, "--format", "cru");
	if (bsdtar->symlink_mode != '\0') {
		strcpy(buff, "-?");
		buff[1] = bsdtar->symlink_mode;
		only_mode(bsdtar, buff, "cru");
	}

	/* Filename "-" implies stdio. */
	if (strcmp(bsdtar->filename, "-") == 0)
		bsdtar->filename = NULL;

	switch(bsdtar->mode) {
	case 'c':
		tar_mode_c(bsdtar);
		break;
	case 'r':
		tar_mode_r(bsdtar);
		break;
	case 't':
		tar_mode_t(bsdtar);
		break;
	case 'u':
		tar_mode_u(bsdtar);
		break;
	case 'x':
		tar_mode_x(bsdtar);
		break;
	}

	archive_match_free(bsdtar->matching);
#if defined(HAVE_REGEX_H) || defined(HAVE_PCREPOSIX_H)
	cleanup_substitution(bsdtar);
#endif
	cset_free(bsdtar->cset);
	passphrase_free(bsdtar->ppbuff);

	if (bsdtar->return_value != 0)
		lafe_warnc(0,
		    "Error exit delayed from previous errors.");
	return (bsdtar->return_value);
}
Ejemplo n.º 2
0
int
main(int argc, char **argv)
{
    struct bsdtar       *bsdtar, bsdtar_storage;
    int          opt, t;
    char             option_o;
    char             possible_help_request;
    char             buff[16];
    time_t           now;

    /*
     * Use a pointer for consistency, but stack-allocated storage
     * for ease of cleanup.
     */
    _bsdtar = bsdtar = &bsdtar_storage;
    memset(bsdtar, 0, sizeof(*bsdtar));
    bsdtar->fd = -1; /* Mark as "unused" */
    option_o = 0;

#if defined(SIGINFO) || defined(SIGUSR1)
    { /* Catch SIGINFO and SIGUSR1, if they exist. */
        struct sigaction sa;
        sa.sa_handler = siginfo_handler;
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;
#ifdef SIGINFO
        if (sigaction(SIGINFO, &sa, NULL))
            lafe_errc(1, errno, "sigaction(SIGINFO) failed");
#endif
#ifdef SIGUSR1
        /* ... and treat SIGUSR1 the same way as SIGINFO. */
        if (sigaction(SIGUSR1, &sa, NULL))
            lafe_errc(1, errno, "sigaction(SIGUSR1) failed");
#endif
    }
#endif


    /* Need lafe_progname before calling lafe_warnc. */
    if (*argv == NULL)
        lafe_progname = "bsdtar";
    else {
#if defined(_WIN32) && !defined(__CYGWIN__)
        lafe_progname = strrchr(*argv, '\\');
#else
        lafe_progname = strrchr(*argv, '/');
#endif
        if (lafe_progname != NULL)
            lafe_progname++;
        else
            lafe_progname = *argv;
    }

    time(&now);

#if HAVE_SETLOCALE
    if (setlocale(LC_ALL, "") == NULL)
        lafe_warnc(0, "Failed to set default locale");
#endif
#if defined(HAVE_NL_LANGINFO) && defined(HAVE_D_MD_ORDER)
    bsdtar->day_first = (*nl_langinfo(D_MD_ORDER) == 'd');
#endif
    possible_help_request = 0;

    /* Look up uid of current user for future reference */
    bsdtar->user_uid = geteuid();

    /* Default: open tape drive. */
    bsdtar->filename = getenv("TAPE");
    if (bsdtar->filename == NULL)
        bsdtar->filename = _PATH_DEFTAPE;

    /* Default: preserve mod time on extract */
    bsdtar->extract_flags = ARCHIVE_EXTRACT_TIME;

    /* Default: Perform basic security checks. */
    bsdtar->extract_flags |= SECURITY;

#ifndef _WIN32
    /* On POSIX systems, assume --same-owner and -p when run by
     * the root user.  This doesn't make any sense on Windows. */
    if (bsdtar->user_uid == 0) {
        /* --same-owner */
        bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
        /* -p */
        bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
        bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
        bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
        bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
    }
#endif

    bsdtar->argv = argv;
    bsdtar->argc = argc;

    /*
     * Comments following each option indicate where that option
     * originated:  SUSv2, POSIX, GNU tar, star, etc.  If there's
     * no such comment, then I don't know of anyone else who
     * implements that option.
     */
    while ((opt = bsdtar_getopt(bsdtar)) != -1) {
        switch (opt) {
        case 'B': /* GNU tar */
            /* libarchive doesn't need this; just ignore it. */
            break;
        case 'b': /* SUSv2 */
            t = atoi(bsdtar->optarg);
            if (t <= 0 || t > 1024)
                lafe_errc(1, 0,
                    "Argument to -b is out of range (1..1024)");
            bsdtar->bytes_per_block = 512 * t;
            break;
        case 'C': /* GNU tar */
            set_chdir(bsdtar, bsdtar->optarg);
            break;
        case 'c': /* SUSv2 */
            set_mode(bsdtar, opt);
            break;
        case OPTION_CHECK_LINKS: /* GNU tar */
            bsdtar->option_warn_links = 1;
            break;
        case OPTION_CHROOT: /* NetBSD */
            bsdtar->option_chroot = 1;
            break;
        case OPTION_EXCLUDE: /* GNU tar */
            if (lafe_exclude(&bsdtar->matching, bsdtar->optarg))
                lafe_errc(1, 0,
                    "Couldn't exclude %s\n", bsdtar->optarg);
            break;
        case OPTION_FORMAT: /* GNU tar, others */
            bsdtar->create_format = bsdtar->optarg;
            break;
        case OPTION_OPTIONS:
            bsdtar->option_options = bsdtar->optarg;
            break;
        case 'f': /* SUSv2 */
            bsdtar->filename = bsdtar->optarg;
            if (strcmp(bsdtar->filename, "-") == 0)
                bsdtar->filename = NULL;
            break;
        case 'H': /* BSD convention */
            bsdtar->symlink_mode = 'H';
            break;
        case 'h': /* Linux Standards Base, gtar; synonym for -L */
            bsdtar->symlink_mode = 'L';
            /* Hack: -h by itself is the "help" command. */
            possible_help_request = 1;
            break;
        case OPTION_HELP: /* GNU tar, others */
            long_help();
            exit(0);
            break;
        case 'I': /* GNU tar */
            /*
             * TODO: Allow 'names' to come from an archive,
             * not just a text file.  Design a good UI for
             * allowing names and mode/owner to be read
             * from an archive, with contents coming from
             * disk.  This can be used to "refresh" an
             * archive or to design archives with special
             * permissions without having to create those
             * permissions on disk.
             */
            bsdtar->names_from_file = bsdtar->optarg;
            break;
        case OPTION_INCLUDE:
            /*
             * Noone else has the @archive extension, so
             * noone else needs this to filter entries
             * when transforming archives.
             */
            if (lafe_include(&bsdtar->matching, bsdtar->optarg))
                lafe_errc(1, 0,
                    "Failed to add %s to inclusion list",
                    bsdtar->optarg);
            break;
        case 'j': /* GNU tar */
            if (bsdtar->create_compression != '\0')
                lafe_errc(1, 0,
                    "Can't specify both -%c and -%c", opt,
                    bsdtar->create_compression);
            bsdtar->create_compression = opt;
            break;
        case 'J': /* GNU tar 1.21 and later */
            if (bsdtar->create_compression != '\0')
                lafe_errc(1, 0,
                    "Can't specify both -%c and -%c", opt,
                    bsdtar->create_compression);
            bsdtar->create_compression = opt;
            break;
        case 'k': /* GNU tar */
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE;
            break;
        case OPTION_KEEP_NEWER_FILES: /* GNU tar */
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE_NEWER;
            break;
        case 'L': /* BSD convention */
            bsdtar->symlink_mode = 'L';
            break;
            case 'l': /* SUSv2 and GNU tar beginning with 1.16 */
            /* GNU tar 1.13  used -l for --one-file-system */
            bsdtar->option_warn_links = 1;
            break;
        case OPTION_LZMA:
            if (bsdtar->create_compression != '\0')
                lafe_errc(1, 0,
                    "Can't specify both -%c and -%c", opt,
                    bsdtar->create_compression);
            bsdtar->create_compression = opt;
            break;
        case 'm': /* SUSv2 */
            bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_TIME;
            break;
        case 'n': /* GNU tar */
            bsdtar->option_no_subdirs = 1;
            break;
            /*
         * Selecting files by time:
         *    --newer-?time='date' Only files newer than 'date'
         *    --newer-?time-than='file' Only files newer than time
         *         on specified file (useful for incremental backups)
         * TODO: Add corresponding "older" options to reverse these.
         */
        case OPTION_NEWER_CTIME: /* GNU tar */
            bsdtar->newer_ctime_sec = get_date(now, bsdtar->optarg);
            break;
        case OPTION_NEWER_CTIME_THAN:
            {
                struct stat st;
                if (stat(bsdtar->optarg, &st) != 0)
                    lafe_errc(1, 0,
                        "Can't open file %s", bsdtar->optarg);
                bsdtar->newer_ctime_sec = st.st_ctime;
                bsdtar->newer_ctime_nsec =
                    ARCHIVE_STAT_CTIME_NANOS(&st);
            }
            break;
        case OPTION_NEWER_MTIME: /* GNU tar */
            bsdtar->newer_mtime_sec = get_date(now, bsdtar->optarg);
            break;
        case OPTION_NEWER_MTIME_THAN:
            {
                struct stat st;
                if (stat(bsdtar->optarg, &st) != 0)
                    lafe_errc(1, 0,
                        "Can't open file %s", bsdtar->optarg);
                bsdtar->newer_mtime_sec = st.st_mtime;
                bsdtar->newer_mtime_nsec =
                    ARCHIVE_STAT_MTIME_NANOS(&st);
            }
            break;
        case OPTION_NODUMP: /* star */
            bsdtar->option_honor_nodump = 1;
            break;
        case OPTION_NO_SAME_OWNER: /* GNU tar */
            bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
            break;
        case OPTION_NO_SAME_PERMISSIONS: /* GNU tar */
            bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_PERM;
            bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_ACL;
            bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_XATTR;
            bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_FFLAGS;
            break;
        case OPTION_NULL: /* GNU tar */
            bsdtar->option_null++;
            break;
        case OPTION_NUMERIC_OWNER: /* GNU tar */
            bsdtar->option_numeric_owner++;
            break;
        case 'O': /* GNU tar */
            bsdtar->option_stdout = 1;
            break;
        case 'o': /* SUSv2 and GNU conflict here, but not fatally */
            option_o = 1; /* Record it and resolve it later. */
            break;
        case OPTION_ONE_FILE_SYSTEM: /* GNU tar */
            bsdtar->option_dont_traverse_mounts = 1;
            break;
#if 0
        /*
         * The common BSD -P option is not necessary, since
         * our default is to archive symlinks, not follow
         * them.  This is convenient, as -P conflicts with GNU
         * tar anyway.
         */
        case 'P': /* BSD convention */
            /* Default behavior, no option necessary. */
            break;
#endif
        case 'P': /* GNU tar */
            bsdtar->extract_flags &= ~SECURITY;
            bsdtar->option_absolute_paths = 1;
            break;
        case 'p': /* GNU tar, star */
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
            break;
        case OPTION_POSIX: /* GNU tar */
            bsdtar->create_format = "pax";
            break;
        case 'q': /* FreeBSD GNU tar --fast-read, NetBSD -q */
            bsdtar->option_fast_read = 1;
            break;
        case 'r': /* SUSv2 */
            set_mode(bsdtar, opt);
            break;
        case 'S': /* NetBSD pax-as-tar */
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_SPARSE;
            break;
        case 's': /* NetBSD pax-as-tar */
#if HAVE_REGEX_H
            add_substitution(bsdtar, bsdtar->optarg);
#else
            lafe_warnc(0,
                "-s is not supported by this version of bsdtar");
            usage();
#endif
            break;
        case OPTION_SAME_OWNER: /* GNU tar */
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
            break;
        case OPTION_STRIP_COMPONENTS: /* GNU tar 1.15 */
            bsdtar->strip_components = atoi(bsdtar->optarg);
            break;
        case 'T': /* GNU tar */
            bsdtar->names_from_file = bsdtar->optarg;
            break;
        case 't': /* SUSv2 */
            set_mode(bsdtar, opt);
            bsdtar->verbose++;
            break;
        case OPTION_TOTALS: /* GNU tar */
            bsdtar->option_totals++;
            break;
        case 'U': /* GNU tar */
            bsdtar->extract_flags |= ARCHIVE_EXTRACT_UNLINK;
            bsdtar->option_unlink_first = 1;
            break;
        case 'u': /* SUSv2 */
            set_mode(bsdtar, opt);
            break;
        case 'v': /* SUSv2 */
            bsdtar->verbose++;
            break;
        case OPTION_VERSION: /* GNU convention */
            version();
            break;
#if 0
        /*
         * The -W longopt feature is handled inside of
         * bsdtar_getopt(), so -W is not available here.
         */
        case 'W': /* Obscure GNU convention. */
            break;
#endif
        case 'w': /* SUSv2 */
            bsdtar->option_interactive = 1;
            break;
        case 'X': /* GNU tar */
            if (lafe_exclude_from_file(&bsdtar->matching, bsdtar->optarg))
                lafe_errc(1, 0,
                    "failed to process exclusions from file %s",
                    bsdtar->optarg);
            break;
        case 'x': /* SUSv2 */
            set_mode(bsdtar, opt);
            break;
        case 'y': /* FreeBSD version of GNU tar */
            if (bsdtar->create_compression != '\0')
                lafe_errc(1, 0,
                    "Can't specify both -%c and -%c", opt,
                    bsdtar->create_compression);
            bsdtar->create_compression = opt;
            break;
        case 'Z': /* GNU tar */
            if (bsdtar->create_compression != '\0')
                lafe_errc(1, 0,
                    "Can't specify both -%c and -%c", opt,
                    bsdtar->create_compression);
            bsdtar->create_compression = opt;
            break;
        case 'z': /* GNU tar, star, many others */
            if (bsdtar->create_compression != '\0')
                lafe_errc(1, 0,
                    "Can't specify both -%c and -%c", opt,
                    bsdtar->create_compression);
            bsdtar->create_compression = opt;
            break;
        case OPTION_USE_COMPRESS_PROGRAM:
            bsdtar->compress_program = bsdtar->optarg;
            break;
        default:
            usage();
        }
    }

    /*
     * Sanity-check options.
     */

    /* If no "real" mode was specified, treat -h as --help. */
    if ((bsdtar->mode == '\0') && possible_help_request) {
        long_help();
        exit(0);
    }

    /* Otherwise, a mode is required. */
    if (bsdtar->mode == '\0')
        lafe_errc(1, 0,
            "Must specify one of -c, -r, -t, -u, -x");

    /* Check boolean options only permitted in certain modes. */
    if (bsdtar->option_dont_traverse_mounts)
        only_mode(bsdtar, "--one-file-system", "cru");
    if (bsdtar->option_fast_read)
        only_mode(bsdtar, "--fast-read", "xt");
    if (bsdtar->option_honor_nodump)
        only_mode(bsdtar, "--nodump", "cru");
    if (option_o > 0) {
        switch (bsdtar->mode) {
        case 'c':
            /*
             * In GNU tar, -o means "old format."  The
             * "ustar" format is the closest thing
             * supported by libarchive.
             */
            bsdtar->create_format = "ustar";
            /* TODO: bsdtar->create_format = "v7"; */
            break;
        case 'x':
            /* POSIX-compatible behavior. */
            bsdtar->option_no_owner = 1;
            bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
            break;
        default:
            only_mode(bsdtar, "-o", "xc");
            break;
        }
    }
    if (bsdtar->option_no_subdirs)
        only_mode(bsdtar, "-n", "cru");
    if (bsdtar->option_stdout)
        only_mode(bsdtar, "-O", "xt");
    if (bsdtar->option_unlink_first)
        only_mode(bsdtar, "-U", "x");
    if (bsdtar->option_warn_links)
        only_mode(bsdtar, "--check-links", "cr");

    /* Check other parameters only permitted in certain modes. */
    if (bsdtar->create_compression != '\0') {
        strcpy(buff, "-?");
        buff[1] = bsdtar->create_compression;
        only_mode(bsdtar, buff, "cxt");
    }
    if (bsdtar->create_format != NULL)
        only_mode(bsdtar, "--format", "cru");
    if (bsdtar->symlink_mode != '\0') {
        strcpy(buff, "-?");
        buff[1] = bsdtar->symlink_mode;
        only_mode(bsdtar, buff, "cru");
    }
    if (bsdtar->strip_components != 0)
        only_mode(bsdtar, "--strip-components", "xt");

    switch(bsdtar->mode) {
    case 'c':
        tar_mode_c(bsdtar);
        break;
    case 'r':
        tar_mode_r(bsdtar);
        break;
    case 't':
        tar_mode_t(bsdtar);
        break;
    case 'u':
        tar_mode_u(bsdtar);
        break;
    case 'x':
        tar_mode_x(bsdtar);
        break;
    }

    lafe_cleanup_exclusions(&bsdtar->matching);
#if HAVE_REGEX_H
    cleanup_substitution(bsdtar);
#endif

    if (bsdtar->return_value != 0)
        lafe_warnc(0,
            "Error exit delayed from previous errors.");
    return (bsdtar->return_value);
}