ndr.pm

wireshark 0.99.7 最新源码

###################################################
# Samba4 NDR info tree generator
# Copyright [e-mail] 2000-2003
# Copyright [e-mail] 2001
# Copyright [e-mail] 2004-2006
# released under the GNU GPL

=pod

=head1 NAME

Parse::Pidl::NDR - NDR parsing information generator

=head1 DESCRIPTION

Return a table describing the order in which the parts of an element
should be parsed
Possible level types:
 - POINTER
 - ARRAY
 - SUBCONTEXT
 - SWITCH
 - DATA

=head1 AUTHOR

Jelmer Vernooij <[e-mail]>

=cut

package Parse::Pidl::NDR;

require Exporter;
use vars qw($VERSION);
$VERSION = '0.01';
@ISA = qw(Exporter);
@EXPORT = qw(GetPrevLevel GetNextLevel ContainsDeferred ContainsString);
@EXPORT_OK = qw(GetElementLevelTable ParseElement ValidElement align_type mapToScalar ParseType can_contain_deferred);

use strict;
use Parse::Pidl qw(warning fatal);
use Parse::Pidl::Typelist qw(hasType getType expandAlias);
use Parse::Pidl::Util qw(has_property property_matches);

# Alignment of the built-in scalar types
my $scalar_alignment = {
	'void' => 0,
	'char' => 1,
	'int8' => 1,
	'uint8' => 1,
	'int16' => 2,
	'uint16' => 2,
	'int32' => 4,
	'uint32' => 4,
	'hyper' => 8,
	'pointer' => 8,
	'dlong' => 4,
	'udlong' => 4,
	'udlongr' => 4,
	'DATA_BLOB' => 4,
	'string' => 4,
	'string_array' => 4, #???
	'time_t' => 4,
	'NTTIME' => 4,
	'NTTIME_1sec' => 4,
	'NTTIME_hyper' => 8,
	'WERROR' => 4,
	'NTSTATUS' => 4,
	'COMRESULT' => 4,
	'nbt_string' => 4,
	'wrepl_nbt_name' => 4,
	'ipv4address' => 4
};

sub GetElementLevelTable($)
{
	my $e = shift;

	my $order = [];
	my $is_deferred = 0;
	my @bracket_array = ();
	my @length_is = ();
	my @size_is = ();
	my $pointer_idx = 0;

	if (has_property($e, "size_is")) {
		@size_is = split /,/, has_property($e, "size_is");
	}

	if (has_property($e, "length_is")) {
		@length_is = split /,/, has_property($e, "length_is");
	}

	if (defined($e->{ARRAY_LEN})) {
		@bracket_array = @{$e->{ARRAY_LEN}};
	}

	if (has_property($e, "out")) {
		my $needptrs = 1;

		if (has_property($e, "string")) { $needptrs++; }
		if ($#bracket_array >= 0) { $needptrs = 0; }

		warning($e, "[out] argument `$e->{NAME}' not a pointer") if ($needptrs > $e->{POINTERS});
	}

	# Parse the [][][][] style array stuff
	for my $i (0 .. $#bracket_array) {
		my $d = $bracket_array[$#bracket_array - $i];
		my $size = $d;
		my $length = $d;
		my $is_surrounding = 0;
		my $is_varying = 0;
		my $is_conformant = 0;
		my $is_string = 0;
		my $is_fixed = 0;
		my $is_inline = 0;

		if ($d eq "*") {
			$is_conformant = 1;
			if ($size = shift @size_is) {
			} elsif ((scalar(@size_is) == 0) and has_property($e, "string")) {
				$is_string = 1;
				delete($e->{PROPERTIES}->{string});
			} else {
				fatal($e, "Must specify size_is() for conformant array!")
			}

			if (($length = shift @length_is) or $is_string) {
				$is_varying = 1;
			} else {
				$length = $size;
			}

			if ($e == $e->{PARENT}->{ELEMENTS}[-1] 
				and $e->{PARENT}->{TYPE} ne "FUNCTION") {
				$is_surrounding = 1;
			}
		}

		$is_fixed = 1 if (not $is_conformant and Parse::Pidl::Util::is_constant($size));
		$is_inline = 1 if (not $is_conformant and not Parse::Pidl::Util::is_constant($size));

		push (@$order, {
			TYPE => "ARRAY",
			SIZE_IS => $size,
			LENGTH_IS => $length,
			IS_DEFERRED => $is_deferred,
			IS_SURROUNDING => $is_surrounding,
			IS_ZERO_TERMINATED => $is_string,
			IS_VARYING => $is_varying,
			IS_CONFORMANT => $is_conformant,
			IS_FIXED => $is_fixed,
			IS_INLINE => $is_inline
		});
	}

	# Next, all the pointers
	foreach my $i (1..$e->{POINTERS}) {
		my $pt = pointer_type($e);

		my $level = "EMBEDDED";
		# Top level "ref" pointers do not have a referrent identifier
		$level = "TOP" if ( defined($pt) 
				and $i == 1
				and $e->{PARENT}->{TYPE} eq "FUNCTION");

		push (@$order, { 
			TYPE => "POINTER",
			# for now, there can only be one pointer type per element
			POINTER_TYPE => pointer_type($e),
			POINTER_INDEX => $pointer_idx,
			IS_DEFERRED => "$is_deferred",
			LEVEL => $level
		});

		warning($e, "top-level \[out\] pointer `$e->{NAME}' is not a \[ref\] pointer") 
			if ($i == 1 and pointer_type($e) ne "ref" and 
				$e->{PARENT}->{TYPE} eq "FUNCTION" and 
				not has_property($e, "in"));

		$pointer_idx++;
		
		# everything that follows will be deferred
		$is_deferred = 1 if ($e->{PARENT}->{TYPE} ne "FUNCTION");

		my $array_size = shift @size_is;
		my $array_length;
		my $is_varying;
		my $is_conformant;
		my $is_string = 0;
		if ($array_size) {
			$is_conformant = 1;
			if ($array_length = shift @length_is) {
				$is_varying = 1;
			} else {
				$array_length = $array_size;
				$is_varying =0;
			}
		} 
		
		if (scalar(@size_is) == 0 and has_property($e, "string") and 
		    $i == $e->{POINTERS}) {
			$is_string = 1;
			$is_varying = $is_conformant = has_property($e, "noheader")?0:1;
			delete($e->{PROPERTIES}->{string});
		}

		if ($array_size or $is_string) {
			push (@$order, {
				TYPE => "ARRAY",
				SIZE_IS => $array_size,
				LENGTH_IS => $array_length,
				IS_DEFERRED => $is_deferred,
				IS_SURROUNDING => 0,
				IS_ZERO_TERMINATED => $is_string,
				IS_VARYING => $is_varying,
				IS_CONFORMANT => $is_conformant,
				IS_FIXED => 0,
				IS_INLINE => 0
			});

			$is_deferred = 0;
		} 
	}

	if (defined(has_property($e, "subcontext"))) {
		my $hdr_size = has_property($e, "subcontext");
		my $subsize = has_property($e, "subcontext_size");
		if (not defined($subsize)) { 
			$subsize = -1; 
		}
		
		push (@$order, {
			TYPE => "SUBCONTEXT",
			HEADER_SIZE => $hdr_size,
			SUBCONTEXT_SIZE => $subsize,
			IS_DEFERRED => $is_deferred,
			COMPRESSION => has_property($e, "compression"),
		});
	}

	if (my $switch = has_property($e, "switch_is")) {
		push (@$order, {
			TYPE => "SWITCH", 
			SWITCH_IS => $switch,
			IS_DEFERRED => $is_deferred
		});
	}

	if (scalar(@size_is) > 0) {
		fatal($e, "size_is() on non-array element");
	}

	if (scalar(@length_is) > 0) {
		fatal($e, "length_is() on non-array element");
	}

	if (has_property($e, "string")) {
		fatal($e, "string() attribute on non-array element");
	}

	push (@$order, {
		TYPE => "DATA",
		DATA_TYPE => $e->{TYPE},
		IS_DEFERRED => $is_deferred,
		CONTAINS_DEFERRED => can_contain_deferred($e->{TYPE}),
		IS_SURROUNDING => 0 #FIXME
	});

	my $i = 0;
	foreach (@$order) { $_->{LEVEL_INDEX} = $i; $i+=1; }

	return $order;
}

#####################################################################
# see if a type contains any deferred data 
sub can_contain_deferred($)
{
	sub can_contain_deferred($);
	my ($type) = @_;

	return 1 unless (hasType($type)); # assume the worst

	$type = getType($type);

	return 0 if (Parse::Pidl::Typelist::is_scalar($type));

	return 1 if ($type->{TYPE} eq "DECLARE"); # assume the worst

	return can_contain_deferred($type->{DATA}) if ($type->{TYPE} eq "TYPEDEF");

	return 0 unless defined($type->{ELEMENTS});

	foreach (@{$type->{ELEMENTS}}) {
		return 1 if ($_->{POINTERS});
		return 1 if (can_contain_deferred ($_->{TYPE}));
	}
	
	return 0;
}

sub pointer_type($)
{
	my $e = shift;

	return undef unless $e->{POINTERS};
	
	return "ref" if (has_property($e, "ref"));
	return "full" if (has_property($e, "ptr"));
	return "sptr" if (has_property($e, "sptr"));
	return "unique" if (has_property($e, "unique"));
	return "relative" if (has_property($e, "relative"));
	return "ignore" if (has_property($e, "ignore"));

	return undef;
}

#####################################################################
# work out the correct alignment for a structure or union
sub find_largest_alignment($)
{
	my $s = shift;

	my $align = 1;
	for my $e (@{$s->{ELEMENTS}}) {
		my $a = 1;

		if ($e->{POINTERS}) {
			$a = 4; 
		} elsif (has_property($e, "subcontext")) { 
			$a = 1;
		} elsif (has_property($e, "transmit_as")) {
			$a = align_type($e->{PROPERTIES}->{transmit_as});
		} else {
			$a = align_type($e->{TYPE}); 
		}

		$align = $a if ($align < $a);
	}

	return $align;
}

#####################################################################
# align a type
sub align_type($)
{
	sub align_type($);
	my ($e) = @_;

	if (ref($e) eq "HASH" and $e->{TYPE} eq "SCALAR") {
		return $scalar_alignment->{$e->{NAME}};
	}

	unless (hasType($e)) {
	    # it must be an external type - all we can do is guess 
		# print "Warning: assuming alignment of unknown type '$e' is 4\n";
	    return 4;
	}

	my $dt = getType($e);

	if ($dt->{TYPE} eq "TYPEDEF" or $dt->{TYPE} eq "DECLARE") {
		return align_type($dt->{DATA});
	} elsif ($dt->{TYPE} eq "ENUM") {
		return align_type(Parse::Pidl::Typelist::enum_type_fn($dt));
	} elsif ($dt->{TYPE} eq "BITMAP") {
		return align_type(Parse::Pidl::Typelist::bitmap_type_fn($dt));
	} elsif (($dt->{TYPE} eq "STRUCT") or ($dt->{TYPE} eq "UNION")) {
		return find_largest_alignment($dt);
	}

	die("Unknown data type type $dt->{TYPE}");
}

sub ParseElement($$)
{
	my ($e, $pointer_default) = @_;

	$e->{TYPE} = expandAlias($e->{TYPE});

	if (ref($e->{TYPE}) eq "HASH") {
		$e->{TYPE} = ParseType($e->{TYPE}, $pointer_default);
	}

	return {
		NAME => $e->{NAME},
		TYPE => $e->{TYPE},
		PROPERTIES => $e->{PROPERTIES},
		LEVELS => GetElementLevelTable($e),
		REPRESENTATION_TYPE => ($e->{PROPERTIES}->{represent_as} or $e->{TYPE}),
		ALIGN => align_type($e->{TYPE}),
		ORIGINAL => $e
	};
}

sub ParseStruct($$)
{
	my ($struct, $pointer_default) = @_;
	my @elements = ();
	my $surrounding = undef;

	return {
		TYPE => "STRUCT",
		NAME => $struct->{NAME},
		SURROUNDING_ELEMENT => undef,
		ELEMENTS => undef,
		PROPERTIES => $struct->{PROPERTIES},
		ORIGINAL => $struct,
		ALIGN => undef
	} unless defined($struct->{ELEMENTS});

	CheckPointerTypes($struct, $pointer_default);

	foreach my $x (@{$struct->{ELEMENTS}}) 
	{
		my $e = ParseElement($x, $pointer_default);
		if ($x != $struct->{ELEMENTS}[-1] and 
			$e->{LEVELS}[0]->{IS_SURROUNDING}) {
			fatal($x, "conformant member not at end of struct");
		}
		push @elements, $e;
	}

	my $e = $elements[-1];
	if (defined($e) and defined($e->{LEVELS}[0]->{IS_SURROUNDING}) and
		$e->{LEVELS}[0]->{IS_SURROUNDING}) {
		$surrounding = $e;
	}

	if (defined $e->{TYPE} && $e->{TYPE} eq "string"
	    &&  property_matches($e, "flag", ".*LIBNDR_FLAG_STR_CONFORMANT.*")) {
		$surrounding = $struct->{ELEMENTS}[-1];
	}

	my $align = undef;
	if ($struct->{NAME}) {
		$align = align_type($struct->{NAME});
	}
		
	return {
		TYPE => "STRUCT",
		NAME => $struct->{NAME},
		SURROUNDING_ELEMENT => $surrounding,
		ELEMENTS => \@elements,
		PROPERTIES => $struct->{PROPERTIES},
		ORIGINAL => $struct,
		ALIGN => $align
	};
}

sub ParseUnion($$)
{
	my ($e, $pointer_default) = @_;
	my @elements = ();
	my $hasdefault = 0;
	my $switch_type = has_property($e, "switch_type");
	unless (defined($switch_type)) { $switch_type = "uint32"; }
	if (has_property($e, "nodiscriminant")) { $switch_type = undef; }

	return {
		TYPE => "UNION",
		NAME => $e->{NAME},
		SWITCH_TYPE => $switch_type,
		ELEMENTS => undef,
		PROPERTIES => $e->{PROPERTIES},
		HAS_DEFAULT => $hasdefault,
		ORIGINAL => $e
	} unless defined($e->{ELEMENTS});

	CheckPointerTypes($e, $pointer_default);

	foreach my $x (@{$e->{ELEMENTS}}) 
	{
		my $t;
		if ($x->{TYPE} eq "EMPTY") {
			$t = { TYPE => "EMPTY" };
		} else {
			$t = ParseElement($x, $pointer_default);
		}
		if (has_property($x, "default")) {
			$t->{CASE} = "default";
			$hasdefault = 1;
		} elsif (defined($x->{PROPERTIES}->{case})) {
			$t->{CASE} = "case $x->{PROPERTIES}->{case}";
		} else {
			die("Union element $x->{NAME} has neither default nor case property");
		}
		push @elements, $t;
	}

	return {
		TYPE => "UNION",
		NAME => $e->{NAME},
		SWITCH_TYPE => $switch_type,
		ELEMENTS => \@elements,
		PROPERTIES => $e->{PROPERTIES},
		HAS_DEFAULT => $hasdefault,
		ORIGINAL => $e
	};
}

sub ParseEnum($$)
{
	my ($e, $pointer_default) = @_;

	return {
		TYPE => "ENUM",
		NAME => $e->{NAME},
		BASE_TYPE => Parse::Pidl::Typelist::enum_type_fn($e),
		ELEMENTS => $e->{ELEMENTS},
		PROPERTIES => $e->{PROPERTIES},
		ORIGINAL => $e
	};
}

sub ParseBitmap($$)
{
	my ($e, $pointer_default) = @_;

	return {
		TYPE => "BITMAP",
		NAME => $e->{NAME},
		BASE_TYPE => Parse::Pidl::Typelist::bitmap_type_fn($e),
		ELEMENTS => $e->{ELEMENTS},
		PROPERTIES => $e->{PROPERTIES},
		ORIGINAL => $e
	};
}

sub ParseType($$)
{
	my ($d, $pointer_default) = @_;

	my $data = {
		STRUCT => \&ParseStruct,
		UNION => \&ParseUnion,
		ENUM => \&ParseEnum,
		BITMAP => \&ParseBitmap,
		TYPEDEF => \&ParseTypedef,
	}->{$d->{TYPE}}->($d, $pointer_default);

	return $data;
}

sub ParseTypedef($$)
{
	my ($d, $pointer_default) = @_;

	if (defined($d->{DATA}->{PROPERTIES}) && !defined($d->{PROPERTIES})) {
		$d->{PROPERTIES} = $d->{DATA}->{PROPERTIES};
	}

	my $data = ParseType($d->{DATA}, $pointer_default);
	$data->{ALIGN} = align_type($d->{NAME});

	return {
		NAME => $d->{NAME},
		TYPE => $d->{TYPE},
		PROPERTIES => $d->{PROPERTIES},
		DATA => $data,
		ORIGINAL => $d
	};
}

sub ParseConst($$)
{
	my ($ndr,$d) = @_;

	return $d;
}

sub ParseFunction($$$)
{
	my ($ndr,$d,$opnum) = @_;
	my @elements = ();
	my $rettype = undef;
	my $thisopnum = undef;

	CheckPointerTypes($d, $ndr->{PROPERTIES}->{pointer_default_top});

	if (not defined($d->{PROPERTIES}{noopnum})) {
		$thisopnum = ${$opnum};
		${$opnum}++;
	}

	foreach my $x (@{$d->{ELEMENTS}}) {
		my $e = ParseElement($x, $ndr->{PROPERTIES}->{pointer_default});
		push (@{$e->{DIRECTION}}, "in") if (has_property($x, "in"));
		push (@{$e->{DIRECTION}}, "out") if (has_property($x, "out"));

		push (@elements, $e);