#30 comms rework

This commit is contained in:
Mikayla Fischler 2022-04-22 15:43:25 -04:00
parent 6daf6df2d0
commit 78a1073e2a

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@ -2,7 +2,8 @@ PROTOCOLS = {
MODBUS_TCP = 0, -- our "MODBUS TCP"-esque protocol
RPLC = 1, -- reactor PLC protocol
SCADA_MGMT = 2, -- SCADA supervisor management, device advertisements, etc
COORD_DATA = 3 -- data packets for coordinators to/from supervisory controller
COORD_DATA = 3, -- data/control packets for coordinators to/from supervisory controllers
COORD_API = 4 -- data/control packets for pocket computers to/from coordinators
}
RPLC_TYPES = {
@ -44,20 +45,24 @@ function scada_packet()
local self = {
modem_msg_in = nil,
valid = false,
raw = nil,
seq_num = nil,
protocol = nil,
length = nil,
raw = nil
payload = nil
}
-- make a SCADA packet
local make = function (seq_num, protocol, payload)
self.valid = true
self.seq_num = seq_num
self.protocol = protocol
self.length = #payload
self.raw = { self.seq_num, self.protocol, self.length, payload }
self.payload = payload
self.raw = { self.seq_num, self.protocol, self.payload }
end
-- parse in a modem message as a SCADA packet
local receive = function (side, sender, reply_to, message, distance)
self.modem_msg_in = {
iface = side,
@ -69,17 +74,19 @@ function scada_packet()
self.raw = self.modem_msg_in.msg
if #self.raw < 3 then
-- malformed
return false
else
if #self.raw >= 3 then
self.valid = true
self.seq_num = self.raw[1]
self.protocol = self.raw[2]
self.length = self.raw[3]
self.length = #self.raw[3]
self.payload = self.raw[3]
end
return self.valid
end
-- public accessors --
local modem_event = function () return self.modem_msg_in end
local raw = function () return self.raw end
@ -91,23 +98,21 @@ function scada_packet()
local seq_num = function () return self.seq_num end
local protocol = function () return self.protocol end
local length = function () return self.length end
local data = function ()
local subset = nil
if self.valid then
subset = { table.unpack(self.raw, 4, 3 + self.length) }
end
return subset
end
local data = function () return self.payload end
return {
-- construct
make = make,
receive = receive,
-- raw access
modem_event = modem_event,
raw = raw,
-- sender/receiver
sender = sender,
receiver = receiver,
-- well-formed
is_valid = is_valid,
-- packet properties
seq_num = seq_num,
protocol = protocol,
length = length,
@ -115,10 +120,12 @@ function scada_packet()
}
end
-- MODBUS packet
-- MODBUS packet
-- modeled after MODBUS TCP packet, but length is not transmitted since these are tables (#data = length, easy)
function modbus_packet()
local self = {
frame = nil,
raw = nil,
txn_id = txn_id,
protocol = protocol,
length = length,
@ -128,13 +135,19 @@ function modbus_packet()
}
-- make a MODBUS packet
local make = function (txn_id, protocol, length, unit_id, func_code, data)
local make = function (txn_id, protocol, unit_id, func_code, data)
self.txn_id = txn_id
self.protocol = protocol
self.length = length
self.length = #data
self.unit_id = unit_id
self.func_code = func_code
self.data = data
-- populate raw array
self.raw = { self.txn_id, self.protocol, self.unit_id, self.func_code }
for i = 1, self.length do
table.insert(self.raw, data[i])
end
end
-- decode a MODBUS packet from a SCADA frame
@ -142,20 +155,28 @@ function modbus_packet()
if frame then
self.frame = frame
local data = frame.data()
local size_ok = #data ~= 6
if size_ok then
make(data[1], data[2], data[3], data[4], data[5], data[6])
if frame.protocol() == PROTOCOLS.MODBUS_TCP then
local size_ok = frame.length() >= 4
if size_ok then
local data = frame.data()
make(data[1], data[2], data[3], data[4], { table.unpack(data, 5, #data) })
end
return size_ok
else
log._debug("attempted MODBUS_TCP parse of incorrect protocol " .. frame.protocol(), true)
return false
end
return size_ok and self.protocol == comms.PROTOCOLS.MODBUS_TCP
else
log._debug("nil frame encountered", true)
return false
end
end
-- get raw to send
local raw_sendable = function () return self.raw end
-- get this packet
local get = function ()
return {
@ -170,8 +191,12 @@ function modbus_packet()
end
return {
-- construct
make = make,
decode = decode,
-- raw access
raw_sendable = raw_sendable,
-- formatted access
get = get
}
end
@ -180,12 +205,14 @@ end
function rplc_packet()
local self = {
frame = nil,
raw = nil,
id = nil,
type = nil,
length = nil,
body = nil
}
-- check that type is known
local _rplc_type_valid = function ()
return self.type == RPLC_TYPES.KEEP_ALIVE or
self.type == RPLC_TYPES.LINK_REQ or
@ -200,11 +227,18 @@ function rplc_packet()
end
-- make an RPLC packet
local make = function (id, packet_type, length, data)
local make = function (id, packet_type, data)
-- packet accessor properties
self.id = id
self.type = packet_type
self.length = length
self.length = #data
self.data = data
-- populate raw array
self.raw = { self.id, self.type }
for i = 1, #data do
table.insert(self.raw, data[i])
end
end
-- decode an RPLC packet from a SCADA frame
@ -212,12 +246,12 @@ function rplc_packet()
if frame then
self.frame = frame
if frame.protocol() == comms.PROTOCOLS.RPLC then
local data = frame.data()
local ok = #data > 2
if frame.protocol() == PROTOCOLS.RPLC then
local ok = frame.length() >= 2
if ok then
make(data[1], data[2], data[3], { table.unpack(data, 4, #data) })
local data = frame.data()
make(data[1], data[2], { table.unpack(data, 3, #data) })
ok = _rplc_type_valid()
end
@ -232,6 +266,10 @@ function rplc_packet()
end
end
-- get raw to send
local raw_sendable = function () return self.raw end
-- get this packet
local get = function ()
return {
scada_frame = self.frame,
@ -243,8 +281,12 @@ function rplc_packet()
end
return {
-- construct
make = make,
decode = decode,
-- raw access
raw_sendable = raw_sendable,
-- formatted access
get = get
}
end
@ -253,11 +295,13 @@ end
function mgmt_packet()
local self = {
frame = nil,
raw = nil,
type = nil,
length = nil,
data = nil
}
-- check that type is known
local _scada_type_valid = function ()
return self.type == SCADA_MGMT_TYPES.PING or
self.type == SCADA_MGMT_TYPES.SV_HEARTBEAT or
@ -267,10 +311,17 @@ function mgmt_packet()
end
-- make a SCADA management packet
local make = function (packet_type, length, data)
local make = function (packet_type, data)
-- packet accessor properties
self.type = packet_type
self.length = length
self.length = #data
self.data = data
-- populate raw array
self.raw = { self.type }
for i = 1, #data do
table.insert(self.raw, data[i])
end
end
-- decode a SCADA management packet from a SCADA frame
@ -278,12 +329,12 @@ function mgmt_packet()
if frame then
self.frame = frame
if frame.protocol() == comms.PROTOCOLS.SCADA_MGMT then
local data = frame.data()
local ok = #data > 1
if frame.protocol() == PROTOCOLS.SCADA_MGMT then
local ok = #data >= 1
if ok then
make(data[1], data[2], { table.unpack(data, 3, #data) })
local data = frame.data()
make(data[1], { table.unpack(data, 2, #data) })
ok = _scada_type_valid()
end
@ -298,6 +349,10 @@ function mgmt_packet()
end
end
-- get raw to send
local raw_sendable = function () return self.raw end
-- get this packet
local get = function ()
return {
scada_frame = self.frame,
@ -308,8 +363,12 @@ function mgmt_packet()
end
return {
-- construct
make = make,
decode = decode,
-- raw access
raw_sendable = raw_sendable,
-- formatted access
get = get
}
end
@ -319,6 +378,7 @@ end
function coord_packet()
local self = {
frame = nil,
raw = nil,
type = nil,
length = nil,
data = nil
@ -330,10 +390,17 @@ function coord_packet()
end
-- make a coordinator packet
local make = function (packet_type, length, data)
local make = function (packet_type, data)
-- packet accessor properties
self.type = packet_type
self.length = length
self.length = #data
self.data = data
-- populate raw array
self.raw = { self.type }
for i = 1, #data do
table.insert(self.raw, data[i])
end
end
-- decode a coordinator packet from a SCADA frame
@ -341,12 +408,12 @@ function coord_packet()
if frame then
self.frame = frame
if frame.protocol() == comms.PROTOCOLS.COORD_DATA then
local data = frame.data()
local ok = #data > 1
if frame.protocol() == PROTOCOLS.COORD_DATA then
local ok = #data >= 1
if ok then
make(data[1], data[2], { table.unpack(data, 3, #data) })
local data = frame.data()
make(data[1], { table.unpack(data, 2, #data) })
ok = _coord_type_valid()
end
@ -361,6 +428,10 @@ function coord_packet()
end
end
-- get raw to send
local raw_sendable = function () return self.raw end
-- get this packet
local get = function ()
return {
scada_frame = self.frame,
@ -371,8 +442,91 @@ function coord_packet()
end
return {
-- construct
make = make,
decode = decode,
-- raw access
raw_sendable = raw_sendable,
-- formatted access
get = get
}
end
-- coordinator API (CAPI) packet
-- @todo
function capi_packet()
local self = {
frame = nil,
raw = nil,
type = nil,
length = nil,
data = nil
}
local _coord_type_valid = function ()
-- @todo
return false
end
-- make a coordinator packet
local make = function (packet_type, data)
-- packet accessor properties
self.type = packet_type
self.length = #data
self.data = data
-- populate raw array
self.raw = { self.type }
for i = 1, #data do
table.insert(self.raw, data[i])
end
end
-- decode a coordinator packet from a SCADA frame
local decode = function (frame)
if frame then
self.frame = frame
if frame.protocol() == PROTOCOLS.COORD_API then
local ok = #data >= 1
if ok then
local data = frame.data()
make(data[1], { table.unpack(data, 2, #data) })
ok = _coord_type_valid()
end
return ok
else
log._debug("attempted COORD_API parse of incorrect protocol " .. frame.protocol(), true)
return false
end
else
log._debug("nil frame encountered", true)
return false
end
end
-- get raw to send
local raw_sendable = function () return self.raw end
-- get this packet
local get = function ()
return {
scada_frame = self.frame,
type = self.type,
length = self.length,
data = self.data
}
end
return {
-- construct
make = make,
decode = decode,
-- raw access
raw_sendable = raw_sendable,
-- formatted access
get = get
}
end