static int
archive_write_gnutar_header(struct archive_write *a,
     struct archive_entry *entry)
{
	char buff[512];
	int r, ret, ret2 = ARCHIVE_OK;
	int tartype;
	struct gnutar *gnutar;
	struct archive_string_conv *sconv;
	struct archive_entry *entry_main;

	gnutar = (struct gnutar *)a->format_data;

	/* Setup default string conversion. */
	if (gnutar->opt_sconv == NULL) {
		if (!gnutar->init_default_conversion) {
			gnutar->sconv_default =
			    archive_string_default_conversion_for_write(
				&(a->archive));
			gnutar->init_default_conversion = 1;
		}
		sconv = gnutar->sconv_default;
	} else
		sconv = gnutar->opt_sconv;

	/* Only regular files (not hardlinks) have data. */
	if (archive_entry_hardlink(entry) != NULL ||
	    archive_entry_symlink(entry) != NULL ||
	    !(archive_entry_filetype(entry) == AE_IFREG))
		archive_entry_set_size(entry, 0);

	if (AE_IFDIR == archive_entry_filetype(entry)) {
		const char *p;
		size_t path_length;
		/*
		 * Ensure a trailing '/'.  Modify the entry so
		 * the client sees the change.
		 */
#if defined(_WIN32) && !defined(__CYGWIN__)
		const wchar_t *wp;

		wp = archive_entry_pathname_w(entry);
		if (wp != NULL && wp[wcslen(wp) -1] != L'/') {
			struct archive_wstring ws;

			archive_string_init(&ws);
			path_length = wcslen(wp);
			if (archive_wstring_ensure(&ws,
			    path_length + 2) == NULL) {
				archive_set_error(&a->archive, ENOMEM,
				    "Can't allocate ustar data");
				archive_wstring_free(&ws);
				return(ARCHIVE_FATAL);
			}
			/* Should we keep '\' ? */
			if (wp[path_length -1] == L'\\')
				path_length--;
			archive_wstrncpy(&ws, wp, path_length);
			archive_wstrappend_wchar(&ws, L'/');
			archive_entry_copy_pathname_w(entry, ws.s);
			archive_wstring_free(&ws);
			p = NULL;
		} else
#endif
			p = archive_entry_pathname(entry);
		/*
		 * On Windows, this is a backup operation just in
		 * case getting WCS failed. On POSIX, this is a
		 * normal operation.
		 */
		if (p != NULL && p[0] != '\0' && p[strlen(p) - 1] != '/') {
			struct archive_string as;

			archive_string_init(&as);
			path_length = strlen(p);
			if (archive_string_ensure(&as,
			    path_length + 2) == NULL) {
				archive_set_error(&a->archive, ENOMEM,
				    "Can't allocate ustar data");
				archive_string_free(&as);
				return(ARCHIVE_FATAL);
			}
#if defined(_WIN32) && !defined(__CYGWIN__)
			/* NOTE: This might break the pathname
			 * if the current code page is CP932 and
			 * the pathname includes a character '\'
			 * as a part of its multibyte pathname. */
			if (p[strlen(p) -1] == '\\')
				path_length--;
			else
#endif
			archive_strncpy(&as, p, path_length);
			archive_strappend_char(&as, '/');
			archive_entry_copy_pathname(entry, as.s);
			archive_string_free(&as);
		}
	}

#if defined(_WIN32) && !defined(__CYGWIN__)
	/* Make sure the path separators in pathname, hardlink and symlink
	 * are all slash '/', not the Windows path separator '\'. */
	entry_main = __la_win_entry_in_posix_pathseparator(entry);
	if (entry_main == NULL) {
		archive_set_error(&a->archive, ENOMEM,
		    "Can't allocate ustar data");
		return(ARCHIVE_FATAL);
	}
	if (entry != entry_main)
		entry = entry_main;
	else
		entry_main = NULL;
#else
	entry_main = NULL;
#endif
	r = archive_entry_pathname_l(entry, &(gnutar->pathname),
	    &(gnutar->pathname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Pathame");
			ret = ARCHIVE_FATAL;
			goto exit_write_header;
		}
		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate pathname '%s' to %s",
		    archive_entry_pathname(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}
	r = archive_entry_uname_l(entry, &(gnutar->uname),
	    &(gnutar->uname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Uname");
			ret = ARCHIVE_FATAL;
			goto exit_write_header;
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate uname '%s' to %s",
		    archive_entry_uname(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}
	r = archive_entry_gname_l(entry, &(gnutar->gname),
	    &(gnutar->gname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Gname");
			ret = ARCHIVE_FATAL;
			goto exit_write_header;
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate gname '%s' to %s",
		    archive_entry_gname(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}

	/* If linkname is longer than 100 chars we need to add a 'K' header. */
	r = archive_entry_hardlink_l(entry, &(gnutar->linkname),
	    &(gnutar->linkname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Linkname");
			ret = ARCHIVE_FATAL;
			goto exit_write_header;
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate linkname '%s' to %s",
		    archive_entry_hardlink(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}
	if (gnutar->linkname_length == 0) {
		r = archive_entry_symlink_l(entry, &(gnutar->linkname),
		    &(gnutar->linkname_length), sconv);
		if (r != 0) {
			if (errno == ENOMEM) {
				archive_set_error(&a->archive, ENOMEM,
				    "Can't allocate memory for Linkname");
				ret = ARCHIVE_FATAL;
				goto exit_write_header;
			}
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "Can't translate linkname '%s' to %s",
			    archive_entry_hardlink(entry),
			    archive_string_conversion_charset_name(sconv));
			ret2 = ARCHIVE_WARN;
		}
	}
	if (gnutar->linkname_length > GNUTAR_linkname_size) {
		size_t length = gnutar->linkname_length + 1;
		struct archive_entry *temp = archive_entry_new2(&a->archive);

		/* Uname/gname here don't really matter since no one reads them;
		 * these are the values that GNU tar happens to use on FreeBSD. */
		archive_entry_set_uname(temp, "root");
		archive_entry_set_gname(temp, "wheel");

		archive_entry_set_pathname(temp, "././@LongLink");
		archive_entry_set_size(temp, length);
		ret = archive_format_gnutar_header(a, buff, temp, 'K');
		archive_entry_free(temp);
		if (ret < ARCHIVE_WARN)
			goto exit_write_header;
		ret = __archive_write_output(a, buff, 512);
		if (ret < ARCHIVE_WARN)
			goto exit_write_header;
		/* Write name and trailing null byte. */
		ret = __archive_write_output(a, gnutar->linkname, length);
		if (ret < ARCHIVE_WARN)
			goto exit_write_header;
		/* Pad to 512 bytes */
		ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)length));
		if (ret < ARCHIVE_WARN)
			goto exit_write_header;
	}

	/* If pathname is longer than 100 chars we need to add an 'L' header. */
	if (gnutar->pathname_length > GNUTAR_name_size) {
		const char *pathname = gnutar->pathname;
		size_t length = gnutar->pathname_length + 1;
		struct archive_entry *temp = archive_entry_new2(&a->archive);

		/* Uname/gname here don't really matter since no one reads them;
		 * these are the values that GNU tar happens to use on FreeBSD. */
		archive_entry_set_uname(temp, "root");
		archive_entry_set_gname(temp, "wheel");

		archive_entry_set_pathname(temp, "././@LongLink");
		archive_entry_set_size(temp, length);
		ret = archive_format_gnutar_header(a, buff, temp, 'L');
		archive_entry_free(temp);
		if (ret < ARCHIVE_WARN)
			goto exit_write_header;
		ret = __archive_write_output(a, buff, 512);
		if(ret < ARCHIVE_WARN)
			goto exit_write_header;
		/* Write pathname + trailing null byte. */
		ret = __archive_write_output(a, pathname, length);
		if(ret < ARCHIVE_WARN)
			goto exit_write_header;
		/* Pad to multiple of 512 bytes. */
		ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)length));
		if (ret < ARCHIVE_WARN)
			goto exit_write_header;
	}

	if (archive_entry_hardlink(entry) != NULL) {
		tartype = '1';
	} else
		switch (archive_entry_filetype(entry)) {
		case AE_IFREG: tartype = '0' ; break;
		case AE_IFLNK: tartype = '2' ; break;
		case AE_IFCHR: tartype = '3' ; break;
		case AE_IFBLK: tartype = '4' ; break;
		case AE_IFDIR: tartype = '5' ; break;
		case AE_IFIFO: tartype = '6' ; break;
		case AE_IFSOCK:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive socket");
			ret = ARCHIVE_FAILED;
			goto exit_write_header;
		default:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive this (mode=0%lo)",
			    (unsigned long)archive_entry_mode(entry));
			ret = ARCHIVE_FAILED;
			goto exit_write_header;
		}

	ret = archive_format_gnutar_header(a, buff, entry, tartype);
	if (ret < ARCHIVE_WARN)
		goto exit_write_header;
	if (ret2 < ret)
		ret = ret2;
	ret2 = __archive_write_output(a, buff, 512);
	if (ret2 < ARCHIVE_WARN) {
		ret = ret2;
		goto exit_write_header;
	}
	if (ret2 < ret)
		ret = ret2;

	gnutar->entry_bytes_remaining = archive_entry_size(entry);
	gnutar->entry_padding = 0x1ff & (-(int64_t)gnutar->entry_bytes_remaining);
exit_write_header:
	archive_entry_free(entry_main);
	return (ret);
}
Ejemplo n.º 2
0
/*
 * Format a basic 512-byte "v7tar" header.
 *
 * Returns -1 if format failed (due to field overflow).
 * Note that this always formats as much of the header as possible.
 * If "strict" is set to zero, it will extend numeric fields as
 * necessary (overwriting terminators or using base-256 extensions).
 *
 */
static int
format_header_v7tar(struct archive_write *a, char h[512],
    struct archive_entry *entry, int strict,
    struct archive_string_conv *sconv)
{
	unsigned int checksum;
	int i, r, ret;
	size_t copy_length;
	const char *p, *pp;
	int mytartype;

	ret = 0;
	mytartype = -1;
	/*
	 * The "template header" already includes the "v7tar"
	 * signature, various end-of-field markers and other required
	 * elements.
	 */
	memcpy(h, &template_header, 512);

	/*
	 * Because the block is already null-filled, and strings
	 * are allowed to exactly fill their destination (without null),
	 * I use memcpy(dest, src, strlen()) here a lot to copy strings.
	 */
	r = archive_entry_pathname_l(entry, &pp, &copy_length, sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Pathname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate pathname '%s' to %s",
		    pp, archive_string_conversion_charset_name(sconv));
		ret = ARCHIVE_WARN;
	}
	if (strict && copy_length < V7TAR_name_size)
		memcpy(h + V7TAR_name_offset, pp, copy_length);
	else if (!strict && copy_length <= V7TAR_name_size)
		memcpy(h + V7TAR_name_offset, pp, copy_length);
	else {
		/* Prefix is too long. */
		archive_set_error(&a->archive, ENAMETOOLONG,
		    "Pathname too long");
		ret = ARCHIVE_FAILED;
	}

	r = archive_entry_hardlink_l(entry, &p, &copy_length, sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Linkname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate linkname '%s' to %s",
		    p, archive_string_conversion_charset_name(sconv));
		ret = ARCHIVE_WARN;
	}
	if (copy_length > 0)
		mytartype = '1';
	else {
		r = archive_entry_symlink_l(entry, &p, &copy_length, sconv);
		if (r != 0) {
			if (errno == ENOMEM) {
				archive_set_error(&a->archive, ENOMEM,
				    "Can't allocate memory for Linkname");
				return (ARCHIVE_FATAL);
			}
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "Can't translate linkname '%s' to %s",
			    p, archive_string_conversion_charset_name(sconv));
			ret = ARCHIVE_WARN;
		}
	}
	if (copy_length > 0) {
		if (copy_length >= V7TAR_linkname_size) {
			archive_set_error(&a->archive, ENAMETOOLONG,
			    "Link contents too long");
			ret = ARCHIVE_FAILED;
			copy_length = V7TAR_linkname_size;
		}
		memcpy(h + V7TAR_linkname_offset, p, copy_length);
	}

	if (format_number(archive_entry_mode(entry) & 07777,
	    h + V7TAR_mode_offset, V7TAR_mode_size,
	    V7TAR_mode_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "Numeric mode too large");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_uid(entry),
	    h + V7TAR_uid_offset, V7TAR_uid_size, V7TAR_uid_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "Numeric user ID too large");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_gid(entry),
	    h + V7TAR_gid_offset, V7TAR_gid_size, V7TAR_gid_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "Numeric group ID too large");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_size(entry),
	    h + V7TAR_size_offset, V7TAR_size_size,
	    V7TAR_size_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "File size out of range");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_mtime(entry),
	    h + V7TAR_mtime_offset, V7TAR_mtime_size,
	    V7TAR_mtime_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "File modification time too large");
		ret = ARCHIVE_FAILED;
	}

	if (mytartype >= 0) {
		h[V7TAR_typeflag_offset] = mytartype;
	} else {
		switch (archive_entry_filetype(entry)) {
		case AE_IFREG: case AE_IFDIR:
			break;
		case AE_IFLNK:
			h[V7TAR_typeflag_offset] = '2';
			break;
		case AE_IFCHR:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive character device");
			return (ARCHIVE_FAILED);
		case AE_IFBLK:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive block device");
			return (ARCHIVE_FAILED);
		case AE_IFIFO:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive fifo");
			return (ARCHIVE_FAILED);
		case AE_IFSOCK:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive socket");
			return (ARCHIVE_FAILED);
		default:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive this (mode=0%lo)",
			    (unsigned long)archive_entry_mode(entry));
			ret = ARCHIVE_FAILED;
		}
	}

	checksum = 0;
	for (i = 0; i < 512; i++)
		checksum += 255 & (unsigned int)h[i];
	format_octal(checksum, h + V7TAR_checksum_offset, 6);
	/* Can't be pre-set in the template. */
	h[V7TAR_checksum_offset + 6] = '\0';
	return (ret);
}
static int
archive_write_gnutar_header(struct archive_write *a,
     struct archive_entry *entry)
{
	char buff[512];
	int r, ret, ret2 = ARCHIVE_OK;
	int tartype;
	struct gnutar *gnutar;
	struct archive_string_conv *sconv;

	gnutar = (struct gnutar *)a->format_data;

	/* Setup default string conversion. */
	if (gnutar->opt_sconv == NULL) {
		if (!gnutar->init_default_conversion) {
			gnutar->sconv_default =
			    archive_string_default_conversion_for_write(
				&(a->archive));
			gnutar->init_default_conversion = 1;
		}
		sconv = gnutar->sconv_default;
	} else
		sconv = gnutar->opt_sconv;

	/* Only regular files (not hardlinks) have data. */
	if (archive_entry_hardlink(entry) != NULL ||
	    archive_entry_symlink(entry) != NULL ||
	    !(archive_entry_filetype(entry) == AE_IFREG))
		archive_entry_set_size(entry, 0);

	if (AE_IFDIR == archive_entry_filetype(entry)) {
		const char *p;
		char *t;
		/*
		 * Ensure a trailing '/'.  Modify the entry so
		 * the client sees the change.
		 */
		p = archive_entry_pathname(entry);
		if (p[strlen(p) - 1] != '/') {
			t = (char *)malloc(strlen(p) + 2);
			if (t == NULL) {
				archive_set_error(&a->archive, ENOMEM,
				"Can't allocate gnutar data");
				return(ARCHIVE_FATAL);
			}
			strcpy(t, p);
			strcat(t, "/");
			archive_entry_copy_pathname(entry, t);
			free(t);
		}
	}

	r = archive_entry_pathname_l(entry, &(gnutar->pathname),
	    &(gnutar->pathname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Pathame");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate pathname '%s' to %s",
		    archive_entry_pathname(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}
	r = archive_entry_uname_l(entry, &(gnutar->uname),
	    &(gnutar->uname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Uname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate uname '%s' to %s",
		    archive_entry_uname(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}
	r = archive_entry_gname_l(entry, &(gnutar->gname),
	    &(gnutar->gname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Gname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate gname '%s' to %s",
		    archive_entry_gname(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}

	/* If linkname is longer than 100 chars we need to add a 'K' header. */
	r = archive_entry_hardlink_l(entry, &(gnutar->linkname),
	    &(gnutar->linkname_length), sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Linkname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate linkname '%s' to %s",
		    archive_entry_hardlink(entry),
		    archive_string_conversion_charset_name(sconv));
		ret2 = ARCHIVE_WARN;
	}
	if (gnutar->linkname_length == 0) {
		r = archive_entry_symlink_l(entry, &(gnutar->linkname),
		    &(gnutar->linkname_length), sconv);
		if (r != 0) {
			if (errno == ENOMEM) {
				archive_set_error(&a->archive, ENOMEM,
				    "Can't allocate memory for Linkname");
				return (ARCHIVE_FATAL);
			}
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "Can't translate linkname '%s' to %s",
			    archive_entry_hardlink(entry),
			    archive_string_conversion_charset_name(sconv));
			ret2 = ARCHIVE_WARN;
		}
	}
	if (gnutar->linkname_length > GNUTAR_linkname_size) {
		size_t todo = gnutar->linkname_length;
		struct archive_entry *temp = archive_entry_new2(&a->archive);

		/* Uname/gname here don't really matter since no one reads them;
		 * these are the values that GNU tar happens to use on FreeBSD. */
		archive_entry_set_uname(temp, "root");
		archive_entry_set_gname(temp, "wheel");

		archive_entry_set_pathname(temp, "././@LongLink");
		archive_entry_set_size(temp, gnutar->linkname_length + 1);
		ret = archive_format_gnutar_header(a, buff, temp, 'K');
		if (ret < ARCHIVE_WARN)
			return (ret);
		ret = __archive_write_output(a, buff, 512);
		if(ret < ARCHIVE_WARN)
			return (ret);
		archive_entry_free(temp);
		/* Write as many 512 bytes blocks as needed to write full name. */
		ret = __archive_write_output(a, gnutar->linkname, todo);
		if(ret < ARCHIVE_WARN)
			return (ret);
		ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)todo));
		if (ret < ARCHIVE_WARN)
			return (ret);
	}

	/* If pathname is longer than 100 chars we need to add an 'L' header. */
	if (gnutar->pathname_length > GNUTAR_name_size) {
		const char *pathname = gnutar->pathname;
		size_t todo = gnutar->pathname_length;
		struct archive_entry *temp = archive_entry_new2(&a->archive);

		/* Uname/gname here don't really matter since no one reads them;
		 * these are the values that GNU tar happens to use on FreeBSD. */
		archive_entry_set_uname(temp, "root");
		archive_entry_set_gname(temp, "wheel");

		archive_entry_set_pathname(temp, "././@LongLink");
		archive_entry_set_size(temp, gnutar->pathname_length + 1);
		ret = archive_format_gnutar_header(a, buff, temp, 'L');
		if (ret < ARCHIVE_WARN)
			return (ret);
		ret = __archive_write_output(a, buff, 512);
		if(ret < ARCHIVE_WARN)
			return (ret);
		archive_entry_free(temp);
		/* Write as many 512 bytes blocks as needed to write full name. */
		ret = __archive_write_output(a, pathname, todo);
		if(ret < ARCHIVE_WARN)
			return (ret);
		ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)todo));
		if (ret < ARCHIVE_WARN)
			return (ret);
	}

	if (archive_entry_hardlink(entry) != NULL) {
		tartype = '1';
	} else
		switch (archive_entry_filetype(entry)) {
		case AE_IFREG: tartype = '0' ; break;
		case AE_IFLNK: tartype = '2' ; break;
		case AE_IFCHR: tartype = '3' ; break;
		case AE_IFBLK: tartype = '4' ; break;
		case AE_IFDIR: tartype = '5' ; break;
		case AE_IFIFO: tartype = '6' ; break;
		case AE_IFSOCK:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive socket");
			return (ARCHIVE_FAILED);
		default:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive this (mode=0%lo)",
			    (unsigned long)archive_entry_mode(entry));
			return (ARCHIVE_FAILED);
		}

	ret = archive_format_gnutar_header(a, buff, entry, tartype);
	if (ret < ARCHIVE_WARN)
		return (ret);
	if (ret2 < ret)
		ret = ret2;
	ret2 = __archive_write_output(a, buff, 512);
	if (ret2 < ARCHIVE_WARN)
		return (ret2);
	if (ret2 < ret)
		ret = ret2;

	gnutar->entry_bytes_remaining = archive_entry_size(entry);
	gnutar->entry_padding = 0x1ff & (-(int64_t)gnutar->entry_bytes_remaining);
	return (ret);
}
Ejemplo n.º 4
0
/*
 * Format a basic 512-byte "ustar" header.
 *
 * Returns -1 if format failed (due to field overflow).
 * Note that this always formats as much of the header as possible.
 * If "strict" is set to zero, it will extend numeric fields as
 * necessary (overwriting terminators or using base-256 extensions).
 *
 * This is exported so that other 'tar' formats can use it.
 */
int
__archive_write_format_header_ustar(struct archive_write *a, char h[512],
    struct archive_entry *entry, int tartype, int strict,
    struct archive_string_conv *sconv)
{
	unsigned int checksum;
	int i, r, ret;
	size_t copy_length;
	const char *p, *pp;
	int mytartype;

	ret = 0;
	mytartype = -1;
	/*
	 * The "template header" already includes the "ustar"
	 * signature, various end-of-field markers and other required
	 * elements.
	 */
	memcpy(h, &template_header, 512);

	/*
	 * Because the block is already null-filled, and strings
	 * are allowed to exactly fill their destination (without null),
	 * I use memcpy(dest, src, strlen()) here a lot to copy strings.
	 */
	r = archive_entry_pathname_l(entry, &pp, &copy_length, sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Pathname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate pathname '%s' to %s",
		    pp, archive_string_conversion_charset_name(sconv));
		ret = ARCHIVE_WARN;
	}
	if (copy_length <= USTAR_name_size)
		memcpy(h + USTAR_name_offset, pp, copy_length);
	else {
		/* Store in two pieces, splitting at a '/'. */
		p = strchr(pp + copy_length - USTAR_name_size - 1, '/');
		/*
		 * Look for the next '/' if we chose the first character
		 * as the separator.  (ustar format doesn't permit
		 * an empty prefix.)
		 */
		if (p == pp)
			p = strchr(p + 1, '/');
		/* Fail if the name won't fit. */
		if (!p) {
			/* No separator. */
			archive_set_error(&a->archive, ENAMETOOLONG,
			    "Pathname too long");
			ret = ARCHIVE_FAILED;
		} else if (p[1] == '\0') {
			/*
			 * The only feasible separator is a final '/';
			 * this would result in a non-empty prefix and
			 * an empty name, which POSIX doesn't
			 * explicitly forbid, but it just feels wrong.
			 */
			archive_set_error(&a->archive, ENAMETOOLONG,
			    "Pathname too long");
			ret = ARCHIVE_FAILED;
		} else if (p  > pp + USTAR_prefix_size) {
			/* Prefix is too long. */
			archive_set_error(&a->archive, ENAMETOOLONG,
			    "Pathname too long");
			ret = ARCHIVE_FAILED;
		} else {
			/* Copy prefix and remainder to appropriate places */
			memcpy(h + USTAR_prefix_offset, pp, p - pp);
			memcpy(h + USTAR_name_offset, p + 1,
			    pp + copy_length - p - 1);
		}
	}

	r = archive_entry_hardlink_l(entry, &p, &copy_length, sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Linkname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate linkname '%s' to %s",
		    p, archive_string_conversion_charset_name(sconv));
		ret = ARCHIVE_WARN;
	}
	if (copy_length > 0)
		mytartype = '1';
	else {
		r = archive_entry_symlink_l(entry, &p, &copy_length, sconv);
		if (r != 0) {
			if (errno == ENOMEM) {
				archive_set_error(&a->archive, ENOMEM,
				    "Can't allocate memory for Linkname");
				return (ARCHIVE_FATAL);
			}
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "Can't translate linkname '%s' to %s",
			    p, archive_string_conversion_charset_name(sconv));
			ret = ARCHIVE_WARN;
		}
	}
	if (copy_length > 0) {
		if (copy_length > USTAR_linkname_size) {
			archive_set_error(&a->archive, ENAMETOOLONG,
			    "Link contents too long");
			ret = ARCHIVE_FAILED;
			copy_length = USTAR_linkname_size;
		}
		memcpy(h + USTAR_linkname_offset, p, copy_length);
	}

	r = archive_entry_uname_l(entry, &p, &copy_length, sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Uname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate uname '%s' to %s",
		    p, archive_string_conversion_charset_name(sconv));
		ret = ARCHIVE_WARN;
	}
	if (copy_length > 0) {
		if (copy_length > USTAR_uname_size) {
			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
			    "Username too long");
			ret = ARCHIVE_FAILED;
			copy_length = USTAR_uname_size;
		}
		memcpy(h + USTAR_uname_offset, p, copy_length);
	}

	r = archive_entry_gname_l(entry, &p, &copy_length, sconv);
	if (r != 0) {
		if (errno == ENOMEM) {
			archive_set_error(&a->archive, ENOMEM,
			    "Can't allocate memory for Gname");
			return (ARCHIVE_FATAL);
		}
		archive_set_error(&a->archive,
		    ARCHIVE_ERRNO_FILE_FORMAT,
		    "Can't translate gname '%s' to %s",
		    p, archive_string_conversion_charset_name(sconv));
		ret = ARCHIVE_WARN;
	}
	if (copy_length > 0) {
		if (strlen(p) > USTAR_gname_size) {
			archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC,
			    "Group name too long");
			ret = ARCHIVE_FAILED;
			copy_length = USTAR_gname_size;
		}
		memcpy(h + USTAR_gname_offset, p, copy_length);
	}

	if (format_number(archive_entry_mode(entry) & 07777,
	    h + USTAR_mode_offset, USTAR_mode_size, USTAR_mode_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "Numeric mode too large");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_uid(entry),
	    h + USTAR_uid_offset, USTAR_uid_size, USTAR_uid_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "Numeric user ID too large");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_gid(entry),
	    h + USTAR_gid_offset, USTAR_gid_size, USTAR_gid_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "Numeric group ID too large");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_size(entry),
	    h + USTAR_size_offset, USTAR_size_size, USTAR_size_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "File size out of range");
		ret = ARCHIVE_FAILED;
	}

	if (format_number(archive_entry_mtime(entry),
	    h + USTAR_mtime_offset, USTAR_mtime_size, USTAR_mtime_max_size, strict)) {
		archive_set_error(&a->archive, ERANGE,
		    "File modification time too large");
		ret = ARCHIVE_FAILED;
	}

	if (archive_entry_filetype(entry) == AE_IFBLK
	    || archive_entry_filetype(entry) == AE_IFCHR) {
		if (format_number(archive_entry_rdevmajor(entry),
		    h + USTAR_rdevmajor_offset, USTAR_rdevmajor_size,
		    USTAR_rdevmajor_max_size, strict)) {
			archive_set_error(&a->archive, ERANGE,
			    "Major device number too large");
			ret = ARCHIVE_FAILED;
		}

		if (format_number(archive_entry_rdevminor(entry),
		    h + USTAR_rdevminor_offset, USTAR_rdevminor_size,
		    USTAR_rdevminor_max_size, strict)) {
			archive_set_error(&a->archive, ERANGE,
			    "Minor device number too large");
			ret = ARCHIVE_FAILED;
		}
	}

	if (tartype >= 0) {
		h[USTAR_typeflag_offset] = tartype;
	} else if (mytartype >= 0) {
		h[USTAR_typeflag_offset] = mytartype;
	} else {
		switch (archive_entry_filetype(entry)) {
		case AE_IFREG: h[USTAR_typeflag_offset] = '0' ; break;
		case AE_IFLNK: h[USTAR_typeflag_offset] = '2' ; break;
		case AE_IFCHR: h[USTAR_typeflag_offset] = '3' ; break;
		case AE_IFBLK: h[USTAR_typeflag_offset] = '4' ; break;
		case AE_IFDIR: h[USTAR_typeflag_offset] = '5' ; break;
		case AE_IFIFO: h[USTAR_typeflag_offset] = '6' ; break;
		case AE_IFSOCK:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive socket");
			return (ARCHIVE_FAILED);
		default:
			archive_set_error(&a->archive,
			    ARCHIVE_ERRNO_FILE_FORMAT,
			    "tar format cannot archive this (mode=0%lo)",
			    (unsigned long)archive_entry_mode(entry));
			ret = ARCHIVE_FAILED;
		}
	}

	checksum = 0;
	for (i = 0; i < 512; i++)
		checksum += 255 & (unsigned int)h[i];
	h[USTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */
	/* h[USTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */
	format_octal(checksum, h + USTAR_checksum_offset, 6);
	return (ret);
}