1 files changed, 93 insertions, 0 deletions
diff --git a/include/dnsjit/filter/layer.lua b/include/dnsjit/filter/layer.lua
new file mode 100644
index 0000000..74c56ba
--- /dev/null
+++ b/include/dnsjit/filter/layer.lua
@@ -0,0 +1,93 @@
+-- Copyright (c) 2018-2021, OARC, Inc.
+-- All rights reserved.
+--
+-- This file is part of dnsjit.
+--
+-- dnsjit 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.
+--
+-- dnsjit 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 dnsjit.  If not, see <http://www.gnu.org/licenses/>.
+
+-- dnsjit.filter.layer
+-- Parse the ether/IP stack
+--   local filter = require("dnsjit.filter.layer").new()
+--
+-- Parse the ether/IP stack of the received objects and send the top most
+-- object to the receivers.
+-- Objects are chained which each layer in the stack with the top most first.
+-- Currently supports input
+-- .IR dnsjit.core.object.pcap .
+module(...,package.seeall)
+
+require("dnsjit.filter.layer_h")
+local ffi = require("ffi")
+local C = ffi.C
+
+local t_name = "filter_layer_t"
+local filter_layer_t = ffi.typeof(t_name)
+local Layer = {}
+
+-- Create a new Layer filter.
+function Layer.new()
+    local self = {
+        _receiver = nil,
+        obj = filter_layer_t(),
+    }
+    C.filter_layer_init(self.obj)
+    ffi.gc(self.obj, C.filter_layer_destroy)
+    return setmetatable(self, { __index = Layer })
+end
+
+-- Return the Log object to control logging of this instance or module.
+function Layer:log()
+    if self == nil then
+        return C.filter_layer_log()
+    end
+    return self.obj._log
+end
+
+-- Return the C functions and context for receiving objects.
+function Layer:receive()
+    return C.filter_layer_receiver(), self.obj
+end
+
+-- Set the receiver to pass objects to.
+function Layer:receiver(o)
+    self.obj.recv, self.obj.ctx = o:receive()
+    self._receiver = o
+end
+
+-- Return the C functions and context for producing objects.
+function Layer:produce()
+    return C.filter_layer_producer(self.obj), self.obj
+end
+
+-- Set the producer to get objects from.
+function Layer:producer(o)
+    self.obj.prod, self.obj.prod_ctx = o:produce()
+    self._producer = o
+end
+
+-- dnsjit.core.object.pcap (3),
+-- dnsjit.core.object.ether (3),
+-- dnsjit.core.object.null (3),
+-- dnsjit.core.object.loop (3),
+-- dnsjit.core.object.linuxsll (3),
+-- dnsjit.core.object.ieee802 (3),
+-- dnsjit.core.object.gre (3),
+-- dnsjit.core.object.ip (3),
+-- dnsjit.core.object.ip6 (3),
+-- dnsjit.core.object.icmp (3),
+-- dnsjit.core.object.icmp6 (3),
+-- dnsjit.core.object.udp (3),
+-- dnsjit.core.object.tcp (3),
+-- dnsjit.core.object.payload (3)
+return Layer