-- SPDX-License-Identifier: GPL-3.0-or-later
------------------------------------------------------------------------
-- pla-util - A power line adapter utility
-- Copyright (C) 2016-2023 John Serock
--
-- This file is part of pla-util.
--
-- pla-util is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- pla-util is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
------------------------------------------------------------------------
with Interfaces.C.Strings;
package body Packets.Filters is
procedure Apply_To (Self : Filter_Type;
Handle : Pcap.Pcap_Access_Type) is
use type Interfaces.C.int;
Return_Code : Interfaces.C.int;
begin
Return_Code := Pcap.Set_Filter (P => Handle,
Filter_Program => Self.Program'Unchecked_Access);
if Return_Code /= 0 then
raise Packet_Error with Interfaces.C.Strings.Value (Item => Pcap.Get_Error_Text (P => Handle));
end if;
end Apply_To;
procedure Compile (Self : in out Filter_Type;
Expression : String;
Handle : Pcap.Pcap_Access_Type) is
use type Interfaces.C.int;
Return_Code : Interfaces.C.int;
begin
Return_Code := Pcap.Compile (P => Handle,
Filter_Program => Self.Program,
Filter_Expression => Interfaces.C.To_C (Item => Expression),
Optimize => 1);
if Return_Code /= 0 then
raise Packet_Error with Interfaces.C.Strings.Value (Item => Pcap.Get_Error_Text (P => Handle));
end if;
end Compile;
overriding procedure Finalize (Self : in out Filter_Type) is
begin
if Self.Program.Instructions /= null then
Pcap.Free_Code (Filter_Program => Self.Program'Unchecked_Access);
end if;
end Finalize;
end Packets.Filters;