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Finish revision of action processing

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This commit is contained in:
Tom Eastep 2010-12-25 14:28:57 -08:00
parent 8218cb3444
commit bdc3ca16a4
2 changed files with 39 additions and 48 deletions
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5
Shorewall/Perl/Shorewall/Compiler.pm
View File

@ -637,6 +637,10 @@ sub compiler {
#
validate_policy;
#
# Process default actions
#
process_actions2;
#
# N O T R A C K
# (Produces no output to the compiled script)
#
@ -761,7 +765,6 @@ sub compiler {
#
# Post-rules action processing.
#
process_actions2;
process_actions3;
#
# MACLIST Filtration again

82
Shorewall/Perl/Shorewall/Rules.pm
View File

@ -42,7 +42,7 @@ our @EXPORT = qw(
process_actions3
process_rules
);
);
our @EXPORT_OK = qw( initialize );
our $VERSION = '4.4_16';
@ -58,9 +58,10 @@ our @builtins;
#
our $rule_commands = { COMMENT => 0, FORMAT => 2 };
use constant { MAX_MACRO_NEST_LEVEL => 5 };
use constant { MAX_MACRO_NEST_LEVEL => 5 , MAX_ACTION_NEST_LEVEL => 5 };
our $macro_nest_level;
our $action_nest_level;
#
# Rather than initializing globals in an INIT block or during declaration,
@ -73,10 +74,10 @@ our $macro_nest_level;
# able to re-initialize its dependent modules' state.
#
sub initialize( $ ) {
$family = shift;
%macros = ();
$macro_nest_level = 0;
$family = shift;
%macros = ();
$macro_nest_level = 0;
$action_nest_level = 0;
if ( $family == F_IPV4 ) {
@builtins = qw/dropBcast allowBcast dropNotSyn rejNotSyn dropInvalid allowInvalid allowinUPnP forwardUPnP Limit/;
@ -248,17 +249,15 @@ sub map_old_actions( $ ) {
# to the target table (%Shorewall::Chains::targets) and actions table, then ${SHAREDIR}/actions.std and
# ${CONFDIR}/actions are scanned (in that order). For each action:
#
# a) The related action definition file is located and scanned.
# b) Forward and unresolved action references are trapped as errors.
# c) A dependency graph is created using the 'requires' field in the 'actions' table.
# a) The related action definition file is located.
# a) The action is added to the target table
#
# As the rules file is scanned, each action[:level[:tag]] is merged onto the 'usedactions' hash. When an <action>
# is merged into the hash, its action chain is created. Where logging is specified, a chain with the name
# %<action>n is used where the <action> name is truncated on the right where necessary to ensure that the total
# length of the chain name does not exceed 30 characters.
# The second phase (process_actions2) occurs after the policy file is scanned. Each default action's file
# is processed by process_action2(). That function recursively processes action files up the action
# invocation tree, adding to the %usedactions hash as each new action is discovered.
#
# The second phase (process_actions2) occurs after the rules file is scanned. The transitive closure of
# %usedactions is generated; again, as new actions are merged into the hash, their action chains are created.
# During rules file processing, process_action2() is called when a new action:level:tag:params is encountered.
# Again, each new such tupple is entered into the %usedactions hash.
#
# The final phase (process_actions3) traverses the keys of %usedactions populating each chain appropriately
# by reading the related action definition file and creating rules. Note that a given action definition file is
@ -267,7 +266,7 @@ sub map_old_actions( $ ) {
sub process_rule_common ( $$$$$$$$$$$$$$$$ );
sub process_action1( $ ) {
sub process_action2( $ ) {
my $wholeaction = shift;
my ( $action , $level, $tag, $param ) = split /:/, $wholeaction;
my $actionfile = find_file "action.$action";
@ -276,8 +275,10 @@ sub process_action1( $ ) {
progress_message2 " Pre-processing $actionfile...";
fatal_error "Actions nested too deeply" if ++$action_nest_level > MAX_ACTION_NEST_LEVEL;
push_open( $actionfile );
while ( read_a_line ) {
my ($wholetarget, @rest ) = split_line1 1, 13, 'action file' , $rule_commands;
@ -304,8 +305,10 @@ sub process_action1( $ ) {
undef # wildcard
) unless $wholetarget eq 'FORMAT' || $wholetarget eq 'COMMENT';
}
pop_open;
--$action_nest_level;
}
sub process_actions1() {
@ -343,8 +346,6 @@ sub process_actions1() {
my $actionfile = find_file "action.$action";
fatal_error "Missing Action File ($actionfile)" unless -f $actionfile;
process_action1 normalize_action_name $action;
}
}
}
@ -375,27 +376,12 @@ sub merge_action_levels( $$ ) {
}
sub process_actions2 () {
progress_message2 'Generating Transitive Closure of Used-action List...';
progress_message2 "Pre-processing default actions...";
my $changed = 1;
my $passes = 0;
while ( $changed ) {
$changed = 0;
$passes++;
for my $target (keys %usedactions) {
my ( $action, $level, $tag, $param ) = split ':', $target;
my $actionref = $actions{$action};
assert( $actionref );
for my $action1 ( keys %{$actionref->{requires}} ) {
my $action2 = merge_action_levels( $target, $action1 );
$changed = 1 if use_action( $action2 );
}
}
for my $action ( keys %usedactions ) {
my ( $basic_action, undef, undef, undef ) = split /:/, $action;
process_action2( $action ) unless $targets{$basic_action} & BUILTIN;
}
progress_message2 "Transitive Closure generated in $passes passes";
}
#
@ -603,6 +589,7 @@ sub process_actions3 () {
'Limit' => \&Limit, );
while ( my ( $wholeaction, $chainref ) = each %usedactions ) {
assert( $chainref->{name} );
my ( $action, $level, $tag, $param ) = split /:/, $wholeaction;
if ( $targets{$action} & BUILTIN ) {
@ -734,7 +721,7 @@ sub process_macro ( $$$$$$$$$$$$$$$$$ ) {
#
sub process_rule_common ( $$$$$$$$$$$$$$$$ ) {
my ( $chainref, #reference to Action Chain if we are being called from process_action3()
# if defined, we are being called from process_action1() and this is the name of the action
# if defined, we are being called from process_action2() and this is the name of the action
$target,
$current_param,
$source,
@ -755,7 +742,7 @@ sub process_rule_common ( $$$$$$$$$$$$$$$$ ) {
my ( $basictarget, $param ) = get_target_param $action;
my $rule = '';
my $optimize = $wildcard ? ( $basictarget =~ /!$/ ? 0 : $config{OPTIMIZE} & 1 ) : 0;
my $inaction1;
my $inaction1 = '';
my $inaction3;
my $normalized_target;
my $normalized_action;
@ -839,14 +826,15 @@ sub process_rule_common ( $$$$$$$$$$$$$$$$ ) {
# Create the action:level:tag:param tupple.
#
$normalized_target = normalize_action( $basictarget, $loglevel, $param );
if ( $inaction1 ) {
fatal_error "An action may not invoke itself" if $basictarget eq $inaction1;
add_requiredby( $normalized_target , $inaction1 );
} else {
if ( $inaction3 ) {
if ( my $ref = use_action( $normalized_target ) ) {
new_nat_chain $ref->{name} if $actiontype & ( NATRULE | NONAT | NATONLY );
new_nat_chain $ref->{name} if ( $actiontype = $targets{$basictarget} ) & NATRULE;
}
} else {
fatal_error "An action may not invoke itself" if $basictarget eq $inaction1;
process_action2( $normalized_target ) if use_action( $normalized_target ) && ! ( $actiontype & BUILTIN );
$actiontype = $targets{$basictarget};
}
}