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Added Pipe Interface
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Mark Qvist
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@ -91,14 +91,16 @@ Currently, the following interfaces are supported:
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- Any device with a serial port
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- TCP over IP networks
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- UDP over IP networks
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- External programs via stdio or pipes
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- Custom hardware via stdio or pipes
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## Development Roadmap
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- Version 0.3.6
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- Improving [the manual](https://markqvist.github.io/Reticulum/manual/) with sections specifically for beginners
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- Version 0.3.7
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- Support for radio and modem interfaces on Android
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- GUI interface configuration tool
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- Easy way to share interface configurations, see [#19](https://github.com/markqvist/Reticulum/discussions/19)
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- Version 0.3.7
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- More interface types for even broader compatibility
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- Plain ESP32 devices (ESP-Now, WiFi, Bluetooth, etc.)
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- More LoRa transceivers
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187
RNS/Interfaces/PipeInterface.py
Normal file
187
RNS/Interfaces/PipeInterface.py
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@ -0,0 +1,187 @@
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# 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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import subprocess
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import shlex
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class HDLC():
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# The Pipe Interface packetizes data using
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# simplified HDLC framing, similar to PPP
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FLAG = 0x7E
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ESC = 0x7D
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ESC_MASK = 0x20
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@staticmethod
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def escape(data):
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data = data.replace(bytes([HDLC.ESC]), bytes([HDLC.ESC, HDLC.ESC^HDLC.ESC_MASK]))
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data = data.replace(bytes([HDLC.FLAG]), bytes([HDLC.ESC, HDLC.FLAG^HDLC.ESC_MASK]))
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return data
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class PipeInterface(Interface):
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MAX_CHUNK = 32768
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BITRATE_GUESS = 1*1000*1000
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owner = None
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command = None
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def __init__(self, owner, name, command, respawn_delay):
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if respawn_delay == None:
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respawn_delay = 5
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self.rxb = 0
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self.txb = 0
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self.owner = owner
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self.name = name
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self.command = command
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self.process = None
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self.timeout = 100
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self.online = False
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self.pipe_is_open = False
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self.bitrate = PipeInterface.BITRATE_GUESS
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self.respawn_delay = respawn_delay
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try:
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self.open_pipe()
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except Exception as e:
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RNS.log("Could connect pipe for interface "+str(self), RNS.LOG_ERROR)
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raise e
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if self.pipe_is_open:
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self.configure_pipe()
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else:
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raise IOError("Could not connect pipe")
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def open_pipe(self):
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RNS.log("Connecting subprocess pipe for "+str(self)+"...", RNS.LOG_VERBOSE)
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try:
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self.process = subprocess.Popen(shlex.split(self.command), stdin=subprocess.PIPE, stdout=subprocess.PIPE)
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self.pipe_is_open = True
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except Exception as e:
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raise e
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self.pipe_is_open = False
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def configure_pipe(self):
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sleep(0.01)
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thread = threading.Thread(target=self.readLoop)
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thread.setDaemon(True)
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thread.start()
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self.online = True
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RNS.log("Subprocess pipe for "+str(self)+" is now connected", RNS.LOG_VERBOSE)
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def processIncoming(self, data):
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self.rxb += len(data)
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self.owner.inbound(data, self)
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def processOutgoing(self,data):
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if self.online:
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data = bytes([HDLC.FLAG])+HDLC.escape(data)+bytes([HDLC.FLAG])
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written = self.process.stdin.write(data)
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self.process.stdin.flush()
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self.txb += len(data)
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if written != len(data):
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raise IOError("Pipe interface only wrote "+str(written)+" bytes of "+str(len(data)))
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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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data_buffer = b""
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last_read_ms = int(time.time()*1000)
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while True:
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process_output = self.process.stdout.read(1)
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if len(process_output) == 0 and self.process.poll() is not None:
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break
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else:
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byte = ord(process_output)
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last_read_ms = int(time.time()*1000)
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if (in_frame and byte == HDLC.FLAG):
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in_frame = False
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self.processIncoming(data_buffer)
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elif (byte == HDLC.FLAG):
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in_frame = True
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data_buffer = b""
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elif (in_frame and len(data_buffer) < RNS.Reticulum.MTU):
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if (byte == HDLC.ESC):
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escape = True
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else:
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if (escape):
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if (byte == HDLC.FLAG ^ HDLC.ESC_MASK):
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byte = HDLC.FLAG
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if (byte == HDLC.ESC ^ HDLC.ESC_MASK):
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byte = HDLC.ESC
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escape = False
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data_buffer = data_buffer+bytes([byte])
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RNS.log("Subprocess terminated on "+str(self))
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self.process.kill()
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except Exception as e:
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self.online = False
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try:
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self.process.kill()
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except Exception as e:
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pass
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RNS.log("A pipe 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.reconnect_pipe()
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def reconnect_pipe(self):
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while not self.online:
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try:
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time.sleep(self.respawn_delay)
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RNS.log("Attempting to respawn subprocess for "+str(self)+"...", RNS.LOG_VERBOSE)
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self.open_pipe()
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if self.pipe_is_open:
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self.configure_pipe()
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except Exception as e:
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RNS.log("Error while spawning subprocess, the contained exception was: "+str(e), RNS.LOG_ERROR)
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RNS.log("Reconnected pipe for "+str(self))
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def __str__(self):
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return "PipeInterface["+self.name+"]"
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@ -117,7 +117,7 @@ class SerialInterface(Interface):
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thread.setDaemon(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("Serial port "+self.port+" is now open", RNS.LOG_VERBOSE)
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def processIncoming(self, data):
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@ -328,7 +328,7 @@ class Reticulum:
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self.__start_local_interface()
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if self.is_shared_instance or self.is_standalone_instance:
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RNS.log("Bringing up system interfaces...", RNS.LOG_DEBUG)
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RNS.log("Bringing up system interfaces...", RNS.LOG_VERBOSE)
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interface_names = []
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for name in self.config["interfaces"]:
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if not name in interface_names:
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@ -642,6 +642,35 @@ class Reticulum:
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else:
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interface.ifac_size = 8
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if c["type"] == "PipeInterface":
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command = c["command"] if "command" in c else None
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respawn_delay = c.as_float("respawn_delay") if "respawn_delay" in c else None
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if command == None:
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raise ValueError("No command specified for PipeInterface")
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interface = PipeInterface.PipeInterface(
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RNS.Transport,
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name,
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command,
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respawn_delay,
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)
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if "outgoing" in c and c.as_bool("outgoing") == False:
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interface.OUT = False
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else:
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interface.OUT = True
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interface.mode = interface_mode
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interface.announce_cap = announce_cap
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if configured_bitrate:
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interface.bitrate = configured_bitrate
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if ifac_size != None:
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interface.ifac_size = ifac_size
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else:
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interface.ifac_size = 8
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if c["type"] == "KISSInterface":
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preamble = int(c["preamble"]) if "preamble" in c else None
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txtail = int(c["txtail"]) if "txtail" in c else None
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@ -827,7 +856,7 @@ class Reticulum:
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RNS.log("The interface name \""+name+"\" was already used. Check your configuration file for errors!", RNS.LOG_ERROR)
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RNS.panic()
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RNS.log("System interfaces are ready", RNS.LOG_DEBUG)
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RNS.log("System interfaces are ready", RNS.LOG_VERBOSE)
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