managementnode/lib/VCL/Module/OS/Linux/firewall/iptables.pm [696:720]:
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	if (!$table_name) {
		notify($ERRORS{'WARNING'}, 0, "table name argument was not specified");
		return;
	}
	elsif (!$chain_name) {
		notify($ERRORS{'WARNING'}, 0, "chain name argument was not specified");
		return;
	}
	elsif (!$rule_specification_hashref) {
		notify($ERRORS{'WARNING'}, 0, "rule specification hash reference argument was not specified");
		return;
	}
	elsif (!ref($rule_specification_hashref) || ref($rule_specification_hashref) ne 'HASH') {
		notify($ERRORS{'WARNING'}, 0, "rule specification argument is not a hash reference:\n" . format_data($rule_specification_hashref));
		return;
	}
	elsif (!scalar(keys(%$rule_specification_hashref))) {
		notify($ERRORS{'WARNING'}, 0, "rule specification argument does not contain any keys");
		return;
	}
	
	my $computer_name = $self->data->get_computer_hostname();
	
	# Avoid duplicate/redundant rules
	my @matching_rules = $self->get_matching_rules($table_name, $chain_name, $rule_specification_hashref);
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managementnode/lib/VCL/Module/OS/Linux/firewall/iptables.pm [1047:1070]:
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	if (!$table_name) {
		notify($ERRORS{'WARNING'}, 0, "table name argument was not specified");
		return;
	}
	elsif (!$chain_name) {
		notify($ERRORS{'WARNING'}, 0, "chain name argument was not specified");
		return;
	}
	elsif (!$rule_specification_hashref) {
		notify($ERRORS{'WARNING'}, 0, "rule specification hash reference argument was not specified");
		return;
	}
	elsif (!ref($rule_specification_hashref) || ref($rule_specification_hashref) ne 'HASH') {
		notify($ERRORS{'WARNING'}, 0, "rule specification argument is not a hash reference:\n" . format_data($rule_specification_hashref));
		return;
	}
	elsif (!scalar(keys(%$rule_specification_hashref))) {
		notify($ERRORS{'WARNING'}, 0, "rule specification argument does not contain any keys");
		return;
	}
	
	my $computer_name = $self->data->get_computer_hostname();
	
	my @matching_rules = $self->get_matching_rules($table_name, $chain_name, $rule_specification_hashref);
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