mirror of
https://github.com/MikaylaFischler/cc-mek-scada.git
synced 2024-08-30 18:22:34 +00:00
464 lines
23 KiB
Lua
464 lines
23 KiB
Lua
local comms = require("scada-common.comms")
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local log = require("scada-common.log")
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local util = require("scada-common.util")
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local svsessions = require("supervisor.session.svsessions")
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local supervisor = {}
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local PROTOCOL = comms.PROTOCOL
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local DEVICE_TYPE = comms.DEVICE_TYPE
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local ESTABLISH_ACK = comms.ESTABLISH_ACK
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local MGMT_TYPE = comms.MGMT_TYPE
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---@type svr_config
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local config = {}
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supervisor.config = config
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-- load the supervisor configuration
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function supervisor.load_config()
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if not settings.load("/supervisor.settings") then return false end
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config.UnitCount = settings.get("UnitCount")
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config.CoolingConfig = settings.get("CoolingConfig")
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config.FacilityTankMode = settings.get("FacilityTankMode")
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config.FacilityTankDefs = settings.get("FacilityTankDefs")
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config.SVR_Channel = settings.get("SVR_Channel")
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config.PLC_Channel = settings.get("PLC_Channel")
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config.RTU_Channel = settings.get("RTU_Channel")
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config.CRD_Channel = settings.get("CRD_Channel")
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config.PKT_Channel = settings.get("PKT_Channel")
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config.PLC_Timeout = settings.get("PLC_Timeout")
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config.RTU_Timeout = settings.get("RTU_Timeout")
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config.CRD_Timeout = settings.get("CRD_Timeout")
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config.PKT_Timeout = settings.get("PKT_Timeout")
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config.TrustedRange = settings.get("TrustedRange")
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config.AuthKey = settings.get("AuthKey")
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config.LogMode = settings.get("LogMode")
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config.LogPath = settings.get("LogPath")
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config.LogDebug = settings.get("LogDebug")
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local cfv = util.new_validator()
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cfv.assert_type_int(config.UnitCount)
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cfv.assert_range(config.UnitCount, 1, 4)
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cfv.assert_type_table(config.CoolingConfig)
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cfv.assert_type_table(config.FacilityTankDefs)
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cfv.assert_type_int(config.FacilityTankMode)
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cfv.assert_range(config.FacilityTankMode, 0, 8)
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cfv.assert_channel(config.SVR_Channel)
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cfv.assert_channel(config.PLC_Channel)
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cfv.assert_channel(config.RTU_Channel)
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cfv.assert_channel(config.CRD_Channel)
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cfv.assert_channel(config.PKT_Channel)
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cfv.assert_type_num(config.PLC_Timeout)
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cfv.assert_min(config.PLC_Timeout, 2)
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cfv.assert_type_num(config.RTU_Timeout)
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cfv.assert_min(config.RTU_Timeout, 2)
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cfv.assert_type_num(config.CRD_Timeout)
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cfv.assert_min(config.CRD_Timeout, 2)
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cfv.assert_type_num(config.PKT_Timeout)
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cfv.assert_min(config.PKT_Timeout, 2)
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cfv.assert_type_num(config.TrustedRange)
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if type(config.AuthKey) == "string" then
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local len = string.len(config.AuthKey)
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cfv.assert_eq(len == 0 or len >= 8, true)
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end
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cfv.assert_type_int(config.LogMode)
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cfv.assert_type_str(config.LogPath)
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cfv.assert_type_bool(config.LogDebug)
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return cfv.valid()
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end
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-- supervisory controller communications
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---@nodiscard
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---@param _version string supervisor version
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---@param nic nic network interface device
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---@param fp_ok boolean if the front panel UI is running
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---@diagnostic disable-next-line: unused-local
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function supervisor.comms(_version, nic, fp_ok)
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-- print a log message to the terminal as long as the UI isn't running
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local function println(message) if not fp_ok then util.println_ts(message) end end
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---@class sv_cooling_conf
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local cooling_conf = { r_cool = config.CoolingConfig, fac_tank_mode = config.FacilityTankMode, fac_tank_defs = config.FacilityTankDefs }
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local self = {
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last_est_acks = {}
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}
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comms.set_trusted_range(config.TrustedRange)
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-- PRIVATE FUNCTIONS --
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-- configure modem channels
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nic.closeAll()
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nic.open(config.SVR_Channel)
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-- pass modem, status, and config data to svsessions
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svsessions.init(nic, fp_ok, config, cooling_conf)
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-- send an establish request response
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---@param packet scada_packet
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---@param ack ESTABLISH_ACK
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---@param data? any optional data
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local function _send_establish(packet, ack, data)
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local s_pkt = comms.scada_packet()
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local m_pkt = comms.mgmt_packet()
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m_pkt.make(MGMT_TYPE.ESTABLISH, { ack, data })
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s_pkt.make(packet.src_addr(), packet.seq_num() + 1, PROTOCOL.SCADA_MGMT, m_pkt.raw_sendable())
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nic.transmit(packet.remote_channel(), config.SVR_Channel, s_pkt)
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self.last_est_acks[packet.src_addr()] = ack
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end
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-- PUBLIC FUNCTIONS --
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---@class superv_comms
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local public = {}
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-- parse a packet
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---@nodiscard
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---@param side string
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---@param sender integer
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---@param reply_to integer
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---@param message any
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---@param distance integer
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---@return modbus_frame|rplc_frame|mgmt_frame|crdn_frame|nil packet
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function public.parse_packet(side, sender, reply_to, message, distance)
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local s_pkt = nic.receive(side, sender, reply_to, message, distance)
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local pkt = nil
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if s_pkt then
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-- get as MODBUS TCP packet
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if s_pkt.protocol() == PROTOCOL.MODBUS_TCP then
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local m_pkt = comms.modbus_packet()
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if m_pkt.decode(s_pkt) then
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pkt = m_pkt.get()
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end
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-- get as RPLC packet
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elseif s_pkt.protocol() == PROTOCOL.RPLC then
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local rplc_pkt = comms.rplc_packet()
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if rplc_pkt.decode(s_pkt) then
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pkt = rplc_pkt.get()
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end
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-- get as SCADA management packet
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elseif s_pkt.protocol() == PROTOCOL.SCADA_MGMT then
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local mgmt_pkt = comms.mgmt_packet()
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if mgmt_pkt.decode(s_pkt) then
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pkt = mgmt_pkt.get()
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end
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-- get as coordinator packet
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elseif s_pkt.protocol() == PROTOCOL.SCADA_CRDN then
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local crdn_pkt = comms.crdn_packet()
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if crdn_pkt.decode(s_pkt) then
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pkt = crdn_pkt.get()
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end
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else
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log.debug("attempted parse of illegal packet type " .. s_pkt.protocol(), true)
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end
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end
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return pkt
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end
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-- handle a packet
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---@param packet modbus_frame|rplc_frame|mgmt_frame|crdn_frame|nil
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function public.handle_packet(packet)
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if packet ~= nil then
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local l_chan = packet.scada_frame.local_channel()
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local r_chan = packet.scada_frame.remote_channel()
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local src_addr = packet.scada_frame.src_addr()
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local protocol = packet.scada_frame.protocol()
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if l_chan ~= config.SVR_Channel then
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log.debug("received packet on unconfigured channel " .. l_chan, true)
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elseif r_chan == config.PLC_Channel then
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-- look for an associated session
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local session = svsessions.find_plc_session(src_addr)
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if protocol == PROTOCOL.RPLC then
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---@cast packet rplc_frame
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-- reactor PLC packet
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if session ~= nil then
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-- pass the packet onto the session handler
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session.in_queue.push_packet(packet)
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else
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-- unknown session, force a re-link
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log.debug("PLC_ESTABLISH: no session but not an establish, forcing relink")
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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elseif protocol == PROTOCOL.SCADA_MGMT then
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---@cast packet mgmt_frame
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-- SCADA management packet
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if session ~= nil then
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-- pass the packet onto the session handler
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session.in_queue.push_packet(packet)
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elseif packet.type == MGMT_TYPE.ESTABLISH then
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-- establish a new session
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local last_ack = self.last_est_acks[src_addr]
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-- validate packet and continue
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if packet.length >= 3 and type(packet.data[1]) == "string" and type(packet.data[2]) == "string" then
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local comms_v = packet.data[1]
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local firmware_v = packet.data[2]
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local dev_type = packet.data[3]
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if comms_v ~= comms.version then
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if last_ack ~= ESTABLISH_ACK.BAD_VERSION then
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log.info(util.c("dropping PLC establish packet with incorrect comms version v", comms_v, " (expected v", comms.version, ")"))
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end
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_send_establish(packet.scada_frame, ESTABLISH_ACK.BAD_VERSION)
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elseif dev_type == DEVICE_TYPE.PLC then
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-- PLC linking request
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if packet.length == 4 and type(packet.data[4]) == "number" then
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local reactor_id = packet.data[4]
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local plc_id = svsessions.establish_plc_session(src_addr, reactor_id, firmware_v)
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if plc_id == false then
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-- reactor already has a PLC assigned
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if last_ack ~= ESTABLISH_ACK.COLLISION then
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log.warning(util.c("PLC_ESTABLISH: assignment collision with reactor ", reactor_id))
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end
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_send_establish(packet.scada_frame, ESTABLISH_ACK.COLLISION)
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else
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-- got an ID; assigned to a reactor successfully
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println(util.c("PLC (", firmware_v, ") [@", src_addr, "] \xbb reactor ", reactor_id, " connected"))
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log.info(util.c("PLC_ESTABLISH: PLC (", firmware_v, ") [@", src_addr, "] reactor unit ", reactor_id, " PLC connected with session ID ", plc_id))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.ALLOW)
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end
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else
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log.debug("PLC_ESTABLISH: packet length mismatch/bad parameter type")
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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log.debug(util.c("illegal establish packet for device ", dev_type, " on PLC channel"))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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log.debug("invalid establish packet (on PLC channel)")
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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-- any other packet should be session related, discard it
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log.debug(util.c("discarding PLC SCADA_MGMT packet without a known session from computer ", src_addr))
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end
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else
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log.debug(util.c("illegal packet type ", protocol, " on PLC channel"))
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end
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elseif r_chan == config.RTU_Channel then
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-- look for an associated session
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local session = svsessions.find_rtu_session(src_addr)
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if protocol == PROTOCOL.MODBUS_TCP then
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---@cast packet modbus_frame
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-- MODBUS response
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if session ~= nil then
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-- pass the packet onto the session handler
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session.in_queue.push_packet(packet)
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else
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-- any other packet should be session related, discard it
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log.debug("discarding MODBUS_TCP packet without a known session")
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end
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elseif protocol == PROTOCOL.SCADA_MGMT then
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---@cast packet mgmt_frame
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-- SCADA management packet
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if session ~= nil then
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-- pass the packet onto the session handler
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session.in_queue.push_packet(packet)
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elseif packet.type == MGMT_TYPE.ESTABLISH then
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-- establish a new session
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local last_ack = self.last_est_acks[src_addr]
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-- validate packet and continue
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if packet.length >= 3 and type(packet.data[1]) == "string" and type(packet.data[2]) == "string" then
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local comms_v = packet.data[1]
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local firmware_v = packet.data[2]
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local dev_type = packet.data[3]
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if comms_v ~= comms.version then
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if last_ack ~= ESTABLISH_ACK.BAD_VERSION then
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log.info(util.c("dropping RTU establish packet with incorrect comms version v", comms_v, " (expected v", comms.version, ")"))
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end
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_send_establish(packet.scada_frame, ESTABLISH_ACK.BAD_VERSION)
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elseif dev_type == DEVICE_TYPE.RTU then
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if packet.length == 4 then
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-- this is an RTU advertisement for a new session
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local rtu_advert = packet.data[4]
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local s_id = svsessions.establish_rtu_session(src_addr, rtu_advert, firmware_v)
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println(util.c("RTU (", firmware_v, ") [@", src_addr, "] \xbb connected"))
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log.info(util.c("RTU_ESTABLISH: RTU (",firmware_v, ") [@", src_addr, "] connected with session ID ", s_id))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.ALLOW)
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else
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log.debug("RTU_ESTABLISH: packet length mismatch")
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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log.debug(util.c("illegal establish packet for device ", dev_type, " on RTU channel"))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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log.debug("invalid establish packet (on RTU channel)")
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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-- any other packet should be session related, discard it
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log.debug(util.c("discarding RTU SCADA_MGMT packet without a known session from computer ", src_addr))
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end
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else
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log.debug(util.c("illegal packet type ", protocol, " on RTU channel"))
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end
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elseif r_chan == config.CRD_Channel then
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-- look for an associated session
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local session = svsessions.find_crd_session(src_addr)
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if protocol == PROTOCOL.SCADA_MGMT then
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---@cast packet mgmt_frame
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-- SCADA management packet
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if session ~= nil then
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-- pass the packet onto the session handler
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session.in_queue.push_packet(packet)
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elseif packet.type == MGMT_TYPE.ESTABLISH then
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-- establish a new session
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local last_ack = self.last_est_acks[src_addr]
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-- validate packet and continue
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if packet.length >= 3 and type(packet.data[1]) == "string" and type(packet.data[2]) == "string" then
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local comms_v = packet.data[1]
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local firmware_v = packet.data[2]
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local dev_type = packet.data[3]
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if comms_v ~= comms.version then
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if last_ack ~= ESTABLISH_ACK.BAD_VERSION then
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log.info(util.c("dropping coordinator establish packet with incorrect comms version v", comms_v, " (expected v", comms.version, ")"))
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end
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_send_establish(packet.scada_frame, ESTABLISH_ACK.BAD_VERSION)
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elseif dev_type == DEVICE_TYPE.CRD then
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-- this is an attempt to establish a new coordinator session
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local s_id = svsessions.establish_crd_session(src_addr, firmware_v)
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if s_id ~= false then
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println(util.c("CRD (", firmware_v, ") [@", src_addr, "] \xbb connected"))
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log.info(util.c("CRD_ESTABLISH: coordinator (", firmware_v, ") [@", src_addr, "] connected with session ID ", s_id))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.ALLOW, { config.UnitCount, cooling_conf })
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else
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if last_ack ~= ESTABLISH_ACK.COLLISION then
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log.info("CRD_ESTABLISH: denied new coordinator [@" .. src_addr .. "] due to already being connected to another coordinator")
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end
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_send_establish(packet.scada_frame, ESTABLISH_ACK.COLLISION)
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end
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else
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log.debug(util.c("illegal establish packet for device ", dev_type, " on coordinator channel"))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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log.debug("CRD_ESTABLISH: establish packet length mismatch")
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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-- any other packet should be session related, discard it
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log.debug(util.c("discarding coordinator SCADA_MGMT packet without a known session from computer ", src_addr))
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end
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elseif protocol == PROTOCOL.SCADA_CRDN then
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---@cast packet crdn_frame
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-- coordinator packet
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if session ~= nil then
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-- pass the packet onto the session handler
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session.in_queue.push_packet(packet)
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else
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-- any other packet should be session related, discard it
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log.debug(util.c("discarding coordinator SCADA_CRDN packet without a known session from computer ", src_addr))
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end
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else
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log.debug(util.c("illegal packet type ", protocol, " on coordinator channel"))
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end
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elseif r_chan == config.PKT_Channel then
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-- look for an associated session
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local session = svsessions.find_pdg_session(src_addr)
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if protocol == PROTOCOL.SCADA_MGMT then
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---@cast packet mgmt_frame
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-- SCADA management packet
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if session ~= nil then
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-- pass the packet onto the session handler
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session.in_queue.push_packet(packet)
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elseif packet.type == MGMT_TYPE.ESTABLISH then
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-- establish a new session
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local last_ack = self.last_est_acks[src_addr]
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-- validate packet and continue
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if packet.length >= 3 and type(packet.data[1]) == "string" and type(packet.data[2]) == "string" then
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local comms_v = packet.data[1]
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local firmware_v = packet.data[2]
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local dev_type = packet.data[3]
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if comms_v ~= comms.version then
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if last_ack ~= ESTABLISH_ACK.BAD_VERSION then
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log.info(util.c("dropping PDG establish packet with incorrect comms version v", comms_v, " (expected v", comms.version, ")"))
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end
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_send_establish(packet.scada_frame, ESTABLISH_ACK.BAD_VERSION)
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elseif dev_type == DEVICE_TYPE.PKT then
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-- this is an attempt to establish a new pocket diagnostic session
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local s_id = svsessions.establish_pdg_session(src_addr, firmware_v)
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println(util.c("PKT (", firmware_v, ") [@", src_addr, "] \xbb connected"))
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log.info(util.c("PDG_ESTABLISH: pocket (", firmware_v, ") [@", src_addr, "] connected with session ID ", s_id))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.ALLOW)
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else
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log.debug(util.c("illegal establish packet for device ", dev_type, " on pocket channel"))
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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log.debug("PDG_ESTABLISH: establish packet length mismatch")
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_send_establish(packet.scada_frame, ESTABLISH_ACK.DENY)
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end
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else
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-- any other packet should be session related, discard it
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|
log.debug(util.c("discarding pocket SCADA_MGMT packet without a known session from computer ", src_addr))
|
|
end
|
|
elseif protocol == PROTOCOL.SCADA_CRDN then
|
|
---@cast packet crdn_frame
|
|
-- coordinator packet
|
|
if session ~= nil then
|
|
-- pass the packet onto the session handler
|
|
session.in_queue.push_packet(packet)
|
|
else
|
|
-- any other packet should be session related, discard it
|
|
log.debug(util.c("discarding pocket SCADA_CRDN packet without a known session from computer ", src_addr))
|
|
end
|
|
else
|
|
log.debug(util.c("illegal packet type ", protocol, " on pocket channel"))
|
|
end
|
|
else
|
|
log.debug("received packet for unknown channel " .. r_chan, true)
|
|
end
|
|
end
|
|
end
|
|
|
|
return public
|
|
end
|
|
|
|
return supervisor
|