You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
188 lines
6.4 KiB
188 lines
6.4 KiB
# MIT License
|
|
#
|
|
# Copyright (c) 2016-2022 Mark Qvist / unsigned.io
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in all
|
|
# copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
# SOFTWARE.
|
|
|
|
from .Interface import Interface
|
|
from time import sleep
|
|
import sys
|
|
import threading
|
|
import time
|
|
import RNS
|
|
|
|
import subprocess
|
|
import shlex
|
|
|
|
class HDLC():
|
|
# The Pipe Interface packetizes data using
|
|
# simplified HDLC framing, similar to PPP
|
|
FLAG = 0x7E
|
|
ESC = 0x7D
|
|
ESC_MASK = 0x20
|
|
|
|
@staticmethod
|
|
def escape(data):
|
|
data = data.replace(bytes([HDLC.ESC]), bytes([HDLC.ESC, HDLC.ESC^HDLC.ESC_MASK]))
|
|
data = data.replace(bytes([HDLC.FLAG]), bytes([HDLC.ESC, HDLC.FLAG^HDLC.ESC_MASK]))
|
|
return data
|
|
|
|
class PipeInterface(Interface):
|
|
MAX_CHUNK = 32768
|
|
BITRATE_GUESS = 1*1000*1000
|
|
|
|
owner = None
|
|
command = None
|
|
|
|
def __init__(self, owner, name, command, respawn_delay):
|
|
if respawn_delay == None:
|
|
respawn_delay = 5
|
|
|
|
super().__init__()
|
|
|
|
self.HW_MTU = 1064
|
|
|
|
self.owner = owner
|
|
self.name = name
|
|
self.command = command
|
|
self.process = None
|
|
self.timeout = 100
|
|
self.online = False
|
|
self.pipe_is_open = False
|
|
self.bitrate = PipeInterface.BITRATE_GUESS
|
|
self.respawn_delay = respawn_delay
|
|
|
|
try:
|
|
self.open_pipe()
|
|
|
|
except Exception as e:
|
|
RNS.log("Could connect pipe for interface "+str(self), RNS.LOG_ERROR)
|
|
raise e
|
|
|
|
if self.pipe_is_open:
|
|
self.configure_pipe()
|
|
else:
|
|
raise IOError("Could not connect pipe")
|
|
|
|
|
|
def open_pipe(self):
|
|
RNS.log("Connecting subprocess pipe for "+str(self)+"...", RNS.LOG_VERBOSE)
|
|
|
|
try:
|
|
self.process = subprocess.Popen(shlex.split(self.command), stdin=subprocess.PIPE, stdout=subprocess.PIPE)
|
|
self.pipe_is_open = True
|
|
except Exception as e:
|
|
raise e
|
|
self.pipe_is_open = False
|
|
|
|
|
|
def configure_pipe(self):
|
|
sleep(0.01)
|
|
thread = threading.Thread(target=self.readLoop)
|
|
thread.daemon = True
|
|
thread.start()
|
|
self.online = True
|
|
RNS.log("Subprocess pipe for "+str(self)+" is now connected", RNS.LOG_VERBOSE)
|
|
|
|
|
|
def processIncoming(self, data):
|
|
self.rxb += len(data)
|
|
self.owner.inbound(data, self)
|
|
|
|
|
|
def processOutgoing(self,data):
|
|
if self.online:
|
|
data = bytes([HDLC.FLAG])+HDLC.escape(data)+bytes([HDLC.FLAG])
|
|
written = self.process.stdin.write(data)
|
|
self.process.stdin.flush()
|
|
self.txb += len(data)
|
|
if written != len(data):
|
|
raise IOError("Pipe interface only wrote "+str(written)+" bytes of "+str(len(data)))
|
|
|
|
|
|
def readLoop(self):
|
|
try:
|
|
in_frame = False
|
|
escape = False
|
|
data_buffer = b""
|
|
last_read_ms = int(time.time()*1000)
|
|
|
|
while True:
|
|
process_output = self.process.stdout.read(1)
|
|
if len(process_output) == 0 and self.process.poll() is not None:
|
|
break
|
|
|
|
else:
|
|
byte = ord(process_output)
|
|
last_read_ms = int(time.time()*1000)
|
|
|
|
if (in_frame and byte == HDLC.FLAG):
|
|
in_frame = False
|
|
self.processIncoming(data_buffer)
|
|
elif (byte == HDLC.FLAG):
|
|
in_frame = True
|
|
data_buffer = b""
|
|
elif (in_frame and len(data_buffer) < self.HW_MTU):
|
|
if (byte == HDLC.ESC):
|
|
escape = True
|
|
else:
|
|
if (escape):
|
|
if (byte == HDLC.FLAG ^ HDLC.ESC_MASK):
|
|
byte = HDLC.FLAG
|
|
if (byte == HDLC.ESC ^ HDLC.ESC_MASK):
|
|
byte = HDLC.ESC
|
|
escape = False
|
|
data_buffer = data_buffer+bytes([byte])
|
|
|
|
RNS.log("Subprocess terminated on "+str(self))
|
|
self.process.kill()
|
|
|
|
except Exception as e:
|
|
self.online = False
|
|
try:
|
|
self.process.kill()
|
|
except Exception as e:
|
|
pass
|
|
|
|
RNS.log("A pipe error occurred, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
RNS.log("The interface "+str(self)+" experienced an unrecoverable error and is now offline.", RNS.LOG_ERROR)
|
|
|
|
if RNS.Reticulum.panic_on_interface_error:
|
|
RNS.panic()
|
|
|
|
RNS.log("Reticulum will attempt to reconnect the interface periodically.", RNS.LOG_ERROR)
|
|
|
|
self.online = False
|
|
self.reconnect_pipe()
|
|
|
|
def reconnect_pipe(self):
|
|
while not self.online:
|
|
try:
|
|
time.sleep(self.respawn_delay)
|
|
RNS.log("Attempting to respawn subprocess for "+str(self)+"...", RNS.LOG_VERBOSE)
|
|
self.open_pipe()
|
|
if self.pipe_is_open:
|
|
self.configure_pipe()
|
|
except Exception as e:
|
|
RNS.log("Error while spawning subprocess, the contained exception was: "+str(e), RNS.LOG_ERROR)
|
|
|
|
RNS.log("Reconnected pipe for "+str(self))
|
|
|
|
def __str__(self):
|
|
return "PipeInterface["+self.name+"]"
|
|
|