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373 lines
14 KiB
373 lines
14 KiB
# MIT License
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#
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# Copyright (c) 2016-2022 Mark Qvist / unsigned.io
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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from .Interface import Interface
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from time import sleep
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import sys
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import threading
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import time
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import RNS
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class KISS():
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FEND = 0xC0
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FESC = 0xDB
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TFEND = 0xDC
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TFESC = 0xDD
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CMD_UNKNOWN = 0xFE
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CMD_DATA = 0x00
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CMD_TXDELAY = 0x01
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CMD_P = 0x02
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CMD_SLOTTIME = 0x03
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CMD_TXTAIL = 0x04
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CMD_FULLDUPLEX = 0x05
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CMD_SETHARDWARE = 0x06
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CMD_READY = 0x0F
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CMD_RETURN = 0xFF
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@staticmethod
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def escape(data):
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data = data.replace(bytes([0xdb]), bytes([0xdb, 0xdd]))
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data = data.replace(bytes([0xc0]), bytes([0xdb, 0xdc]))
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return data
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class AX25():
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PID_NOLAYER3 = 0xF0
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CTRL_UI = 0x03
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CRC_CORRECT = bytes([0xF0])+bytes([0xB8])
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HEADER_SIZE = 16
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class AX25KISSInterface(Interface):
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MAX_CHUNK = 32768
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BITRATE_GUESS = 1200
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owner = None
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port = None
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speed = None
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databits = None
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parity = None
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stopbits = None
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serial = None
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def __init__(self, owner, name, callsign, ssid, port, speed, databits, parity, stopbits, preamble, txtail, persistence, slottime, flow_control):
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import importlib
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if importlib.util.find_spec('serial') != None:
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import serial
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else:
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RNS.log("Using the AX.25 KISS interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL)
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RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL)
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RNS.panic()
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super().__init__()
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self.HW_MTU = 564
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self.pyserial = serial
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self.serial = None
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self.owner = owner
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self.name = name
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self.src_call = callsign.upper().encode("ascii")
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self.src_ssid = ssid
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self.dst_call = "APZRNS".encode("ascii")
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self.dst_ssid = 0
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self.port = port
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self.speed = speed
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self.databits = databits
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self.parity = serial.PARITY_NONE
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self.stopbits = stopbits
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self.timeout = 100
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self.online = False
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self.bitrate = KISSInterface.BITRATE_GUESS
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self.packet_queue = []
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self.flow_control = flow_control
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self.interface_ready = False
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self.flow_control_timeout = 5
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self.flow_control_locked = time.time()
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if (len(self.src_call) < 3 or len(self.src_call) > 6):
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raise ValueError("Invalid callsign for "+str(self))
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if (self.src_ssid < 0 or self.src_ssid > 15):
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raise ValueError("Invalid SSID for "+str(self))
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self.preamble = preamble if preamble != None else 350;
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self.txtail = txtail if txtail != None else 20;
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self.persistence = persistence if persistence != None else 64;
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self.slottime = slottime if slottime != None else 20;
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if parity.lower() == "e" or parity.lower() == "even":
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self.parity = serial.PARITY_EVEN
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if parity.lower() == "o" or parity.lower() == "odd":
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self.parity = serial.PARITY_ODD
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try:
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self.open_port()
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except Exception as e:
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RNS.log("Could not open serial port for interface "+str(self), RNS.LOG_ERROR)
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raise e
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if self.serial.is_open:
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self.configure_device()
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else:
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raise IOError("Could not open serial port")
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def open_port(self):
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RNS.log("Opening serial port "+self.port+"...", RNS.LOG_VERBOSE)
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self.serial = self.pyserial.Serial(
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port = self.port,
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baudrate = self.speed,
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bytesize = self.databits,
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parity = self.parity,
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stopbits = self.stopbits,
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xonxoff = False,
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rtscts = False,
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timeout = 0,
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inter_byte_timeout = None,
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write_timeout = None,
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dsrdtr = False,
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)
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def configure_device(self):
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# Allow time for interface to initialise before config
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sleep(2.0)
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thread = threading.Thread(target=self.readLoop)
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thread.daemon = True
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thread.start()
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self.online = True
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RNS.log("Serial port "+self.port+" is now open")
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RNS.log("Configuring AX.25 KISS interface parameters...")
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self.setPreamble(self.preamble)
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self.setTxTail(self.txtail)
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self.setPersistence(self.persistence)
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self.setSlotTime(self.slottime)
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self.setFlowControl(self.flow_control)
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self.interface_ready = True
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RNS.log("AX.25 KISS interface configured")
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def setPreamble(self, preamble):
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preamble_ms = preamble
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preamble = int(preamble_ms / 10)
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if preamble < 0:
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preamble = 0
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if preamble > 255:
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preamble = 255
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kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_TXDELAY])+bytes([preamble])+bytes([KISS.FEND])
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written = self.serial.write(kiss_command)
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if written != len(kiss_command):
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raise IOError("Could not configure AX.25 KISS interface preamble to "+str(preamble_ms)+" (command value "+str(preamble)+")")
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def setTxTail(self, txtail):
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txtail_ms = txtail
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txtail = int(txtail_ms / 10)
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if txtail < 0:
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txtail = 0
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if txtail > 255:
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txtail = 255
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kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_TXTAIL])+bytes([txtail])+bytes([KISS.FEND])
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written = self.serial.write(kiss_command)
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if written != len(kiss_command):
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raise IOError("Could not configure AX.25 KISS interface TX tail to "+str(txtail_ms)+" (command value "+str(txtail)+")")
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def setPersistence(self, persistence):
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if persistence < 0:
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persistence = 0
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if persistence > 255:
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persistence = 255
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kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_P])+bytes([persistence])+bytes([KISS.FEND])
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written = self.serial.write(kiss_command)
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if written != len(kiss_command):
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raise IOError("Could not configure AX.25 KISS interface persistence to "+str(persistence))
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def setSlotTime(self, slottime):
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slottime_ms = slottime
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slottime = int(slottime_ms / 10)
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if slottime < 0:
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slottime = 0
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if slottime > 255:
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slottime = 255
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kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_SLOTTIME])+bytes([slottime])+bytes([KISS.FEND])
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written = self.serial.write(kiss_command)
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if written != len(kiss_command):
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raise IOError("Could not configure AX.25 KISS interface slot time to "+str(slottime_ms)+" (command value "+str(slottime)+")")
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def setFlowControl(self, flow_control):
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kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_READY])+bytes([0x01])+bytes([KISS.FEND])
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written = self.serial.write(kiss_command)
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if written != len(kiss_command):
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if (flow_control):
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raise IOError("Could not enable AX.25 KISS interface flow control")
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else:
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raise IOError("Could not enable AX.25 KISS interface flow control")
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def processIncoming(self, data):
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if (len(data) > AX25.HEADER_SIZE):
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self.rxb += len(data)
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self.owner.inbound(data[AX25.HEADER_SIZE:], self)
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def processOutgoing(self,data):
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datalen = len(data)
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if self.online:
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if self.interface_ready:
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if self.flow_control:
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self.interface_ready = False
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self.flow_control_locked = time.time()
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encoded_dst_ssid = bytes([0x60 | (self.dst_ssid << 1)])
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encoded_src_ssid = bytes([0x60 | (self.src_ssid << 1) | 0x01])
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addr = b""
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for i in range(0,6):
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if (i < len(self.dst_call)):
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addr += bytes([self.dst_call[i]<<1])
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else:
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addr += bytes([0x20])
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addr += encoded_dst_ssid
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for i in range(0,6):
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if (i < len(self.src_call)):
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addr += bytes([self.src_call[i]<<1])
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else:
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addr += bytes([0x20])
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addr += encoded_src_ssid
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data = addr+bytes([AX25.CTRL_UI])+bytes([AX25.PID_NOLAYER3])+data
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data = data.replace(bytes([0xdb]), bytes([0xdb])+bytes([0xdd]))
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data = data.replace(bytes([0xc0]), bytes([0xdb])+bytes([0xdc]))
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kiss_frame = bytes([KISS.FEND])+bytes([0x00])+data+bytes([KISS.FEND])
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written = self.serial.write(kiss_frame)
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self.txb += datalen
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if written != len(kiss_frame):
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if self.flow_control:
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self.interface_ready = True
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raise IOError("AX.25 interface only wrote "+str(written)+" bytes of "+str(len(kiss_frame)))
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else:
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self.queue(data)
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def queue(self, data):
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self.packet_queue.append(data)
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def process_queue(self):
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if len(self.packet_queue) > 0:
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data = self.packet_queue.pop(0)
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self.interface_ready = True
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self.processOutgoing(data)
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elif len(self.packet_queue) == 0:
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self.interface_ready = True
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def readLoop(self):
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try:
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in_frame = False
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escape = False
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command = KISS.CMD_UNKNOWN
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data_buffer = b""
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last_read_ms = int(time.time()*1000)
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while self.serial.is_open:
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if self.serial.in_waiting:
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byte = ord(self.serial.read(1))
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last_read_ms = int(time.time()*1000)
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if (in_frame and byte == KISS.FEND and command == KISS.CMD_DATA):
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in_frame = False
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self.processIncoming(data_buffer)
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elif (byte == KISS.FEND):
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in_frame = True
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command = KISS.CMD_UNKNOWN
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data_buffer = b""
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elif (in_frame and len(data_buffer) < self.HW_MTU+AX25.HEADER_SIZE):
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if (len(data_buffer) == 0 and command == KISS.CMD_UNKNOWN):
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# We only support one HDLC port for now, so
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# strip off the port nibble
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byte = byte & 0x0F
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command = byte
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elif (command == KISS.CMD_DATA):
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if (byte == KISS.FESC):
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escape = True
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else:
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if (escape):
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if (byte == KISS.TFEND):
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byte = KISS.FEND
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if (byte == KISS.TFESC):
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byte = KISS.FESC
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escape = False
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data_buffer = data_buffer+bytes([byte])
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elif (command == KISS.CMD_READY):
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self.process_queue()
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else:
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time_since_last = int(time.time()*1000) - last_read_ms
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if len(data_buffer) > 0 and time_since_last > self.timeout:
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data_buffer = b""
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in_frame = False
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command = KISS.CMD_UNKNOWN
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escape = False
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sleep(0.05)
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if self.flow_control:
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if not self.interface_ready:
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if time.time() > self.flow_control_locked + self.flow_control_timeout:
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RNS.log("Interface "+str(self)+" is unlocking flow control due to time-out. This should not happen. Your hardware might have missed a flow-control READY command, or maybe it does not support flow-control.", RNS.LOG_WARNING)
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self.process_queue()
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except Exception as e:
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self.online = False
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RNS.log("A serial port error occurred, the contained exception was: "+str(e), RNS.LOG_ERROR)
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RNS.log("The interface "+str(self)+" experienced an unrecoverable error and is now offline.", RNS.LOG_ERROR)
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if RNS.Reticulum.panic_on_interface_error:
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RNS.panic()
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RNS.log("Reticulum will attempt to reconnect the interface periodically.", RNS.LOG_ERROR)
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self.online = False
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self.serial.close()
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self.reconnect_port()
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def reconnect_port(self):
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while not self.online:
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try:
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time.sleep(5)
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RNS.log("Attempting to reconnect serial port "+str(self.port)+" for "+str(self)+"...", RNS.LOG_VERBOSE)
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self.open_port()
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if self.serial.is_open:
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self.configure_device()
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except Exception as e:
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RNS.log("Error while reconnecting port, the contained exception was: "+str(e), RNS.LOG_ERROR)
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RNS.log("Reconnected serial port for "+str(self))
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def should_ingress_limit(self):
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return False
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def __str__(self):
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return "AX25KISSInterface["+self.name+"]" |