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Reticulum/RNS/Reticulum.py
Mark Qvist 0fe76d50f6 Improved documentation.
2021-09-02 20:35:42 +02:00

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from .Interfaces import *
import configparser
from .vendor.configobj import ConfigObj
import RNS
import atexit
import struct
import array
import os.path
import os
import RNS
class Reticulum:
"""
This class is used to initialise access to Reticulum within a
program. You must create exactly one instance of this class before
carrying out any other RNS operations, such as creating destinations
or sending traffic. Every independently executed program must create
their own instance of the Reticulum class, but Reticulum will
automatically handle inter-program communication on the same system,
and expose all connected programs to external interfaces as well.
As soon as an instance of this class is created, Reticulum will start
opening and configuring any hardware devices specified in the supplied
configuration.
Currently the first running instance must be kept running while other
local instances are connected, as the first created instance will
act as a master instance that directly communicates with external
hardware such as modems, TNCs and radios. If a master instance is
asked to exit, it will not exit until all client processes have
terminated (unless killed forcibly).
If you are running Reticulum on a system with several different
programs that use RNS starting and terminating at different times,
it will be advantageous to run a master RNS instance as a daemon for
other programs to use on demand.
"""
# Future minimum will probably be locked in at 244 bytes to support
# networks with segments of different MTUs. Absolute minimum is 211.
MTU = 500
"""
The MTU that Reticulum adheres to, and will expect other peers to
adhere to. By default, the MTU is 500 bytes. In custom RNS network
implementations, it is possible to change this value, but doing so will
completely break compatibility with all other RNS networks. An identical
MTU is a prerequisite for peers to communicate in the same network.
Unless you really know what you are doing, the MTU should be left at
the default value.
"""
# Length of truncated hashes in bits.
TRUNCATED_HASHLENGTH = 80
HEADER_MINSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*1
HEADER_MAXSIZE = 2+1+(TRUNCATED_HASHLENGTH//8)*2
MDU = MTU - HEADER_MAXSIZE
router = None
config = None
# The default configuration path will be expanded to a directory
# named ".reticulum" inside the current users home directory
configdir = os.path.expanduser("~")+"/.reticulum"
configpath = ""
storagepath = ""
cachepath = ""
@staticmethod
def exit_handler():
# This exit handler is called whenever Reticulum is asked to
# shut down, and will in turn call exit handlers in other
# classes, saving necessary information to disk and carrying
# out cleanup operations.
RNS.Transport.exit_handler()
RNS.Identity.exit_handler()
def __init__(self,configdir=None):
"""
Initialises and starts a Reticulum instance. This must be
done before any other operations, and Reticulum will not
pass any traffic before being instantiated.
:param configdir: Full path to a Reticulum configuration directory.
"""
if configdir != None:
Reticulum.configdir = configdir
Reticulum.configpath = Reticulum.configdir+"/config"
Reticulum.storagepath = Reticulum.configdir+"/storage"
Reticulum.cachepath = Reticulum.configdir+"/storage/cache"
Reticulum.resourcepath = Reticulum.configdir+"/storage/resources"
Reticulum.__allow_unencrypted = False
Reticulum.__transport_enabled = False
Reticulum.__use_implicit_proof = True
self.local_interface_port = 37428
self.share_instance = True
self.is_shared_instance = False
self.is_connected_to_shared_instance = False
self.is_standalone_instance = False
if not os.path.isdir(Reticulum.storagepath):
os.makedirs(Reticulum.storagepath)
if not os.path.isdir(Reticulum.cachepath):
os.makedirs(Reticulum.cachepath)
if not os.path.isdir(Reticulum.resourcepath):
os.makedirs(Reticulum.resourcepath)
if os.path.isfile(self.configpath):
try:
self.config = ConfigObj(self.configpath)
RNS.log("Configuration loaded from "+self.configpath)
except Exception as e:
RNS.log("Could not parse the configuration at "+self.configpath, RNS.LOG_ERROR)
RNS.log("Check your configuration file for errors!", RNS.LOG_ERROR)
RNS.panic()
else:
RNS.log("Could not load config file, creating default configuration file...")
self.__create_default_config()
RNS.log("Default config file created. Make any necessary changes in "+Reticulum.configdir+"/config and start Reticulum again.")
RNS.log("Exiting now!")
exit(1)
self.__apply_config()
RNS.Identity.load_known_destinations()
RNS.Transport.start(self)
atexit.register(Reticulum.exit_handler)
def __start_local_interface(self):
if self.share_instance:
try:
interface = LocalInterface.LocalServerInterface(
RNS.Transport,
self.local_interface_port
)
interface.OUT = True
RNS.Transport.interfaces.append(interface)
self.is_shared_instance = True
RNS.log("Started shared instance interface: "+str(interface), RNS.LOG_DEBUG)
except Exception as e:
try:
interface = LocalInterface.LocalClientInterface(
RNS.Transport,
"Local shared instance",
self.local_interface_port)
interface.target_port = self.local_interface_port
interface.OUT = True
RNS.Transport.interfaces.append(interface)
self.is_shared_instance = False
self.is_standalone_instance = False
self.is_connected_to_shared_instance = True
RNS.log("Connected to local shared instance via: "+str(interface), RNS.LOG_DEBUG)
except Exception as e:
RNS.log("Local shared instance appears to be running, but it could not be connected", RNS.LOG_ERROR)
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
self.is_shared_instance = False
self.is_standalone_instance = True
self.is_connected_to_shared_instance = False
else:
self.is_shared_instance = False
self.is_standalone_instance = True
self.is_connected_to_shared_instance = False
def __apply_config(self):
if "logging" in self.config:
for option in self.config["logging"]:
value = self.config["logging"][option]
if option == "loglevel":
RNS.loglevel = int(value)
if RNS.loglevel < 0:
RNS.loglevel = 0
if RNS.loglevel > 7:
RNS.loglevel = 7
if "reticulum" in self.config:
for option in self.config["reticulum"]:
value = self.config["reticulum"][option]
if option == "share_instance":
value = self.config["reticulum"].as_bool(option)
self.share_instance = value
if option == "shared_instance_port":
value = int(self.config["reticulum"][option])
self.local_interface_port = value
if option == "enable_transport":
v = self.config["reticulum"].as_bool(option)
if v == True:
Reticulum.__transport_enabled = True
if option == "use_implicit_proof":
v = self.config["reticulum"].as_bool(option)
if v == True:
Reticulum.__use_implicit_proof = True
if v == False:
Reticulum.__use_implicit_proof = False
if option == "allow_unencrypted":
v = self.config["reticulum"].as_bool(option)
if v == True:
RNS.log("", RNS.LOG_CRITICAL)
RNS.log("! ! ! ! ! ! ! ! !", RNS.LOG_CRITICAL)
RNS.log("", RNS.LOG_CRITICAL)
RNS.log("Danger! Encryptionless links have been allowed in the config file!", RNS.LOG_CRITICAL)
RNS.log("Beware of the consequences! Any data sent over a link can potentially be intercepted,", RNS.LOG_CRITICAL)
RNS.log("read and modified! If you are not absolutely sure that you want this,", RNS.LOG_CRITICAL)
RNS.log("you should exit Reticulum NOW and change your config file!", RNS.LOG_CRITICAL)
RNS.log("", RNS.LOG_CRITICAL)
RNS.log("! ! ! ! ! ! ! ! !", RNS.LOG_CRITICAL)
RNS.log("", RNS.LOG_CRITICAL)
Reticulum.__allow_unencrypted = True
self.__start_local_interface()
if self.is_shared_instance or self.is_standalone_instance:
interface_names = []
for name in self.config["interfaces"]:
if not name in interface_names:
c = self.config["interfaces"][name]
try:
if ("interface_enabled" in c) and c.as_bool("interface_enabled") == True:
if c["type"] == "UDPInterface":
device = c["device"] if "device" in c else None
port = int(c["port"]) if "port" in c else None
listen_ip = c["listen_ip"] if "listen_ip" in c else None
listen_port = int(c["listen_port"]) if "listen_port" in c else None
forward_ip = c["forward_ip"] if "forward_ip" in c else None
forward_port = int(c["forward_port"]) if "forward_port" in c else None
if port != None:
if listen_port == None:
listen_port = port
if forward_port == None:
forward_port = port
interface = UDPInterface.UDPInterface(
RNS.Transport,
name,
device,
listen_ip,
listen_port,
forward_ip,
forward_port
)
if "outgoing" in c and c.as_bool("outgoing") == True:
interface.OUT = True
else:
interface.OUT = False
RNS.Transport.interfaces.append(interface)
if c["type"] == "TCPServerInterface":
device = c["device"] if "device" in c else None
port = int(c["port"]) if "port" in c else None
listen_ip = c["listen_ip"] if "listen_ip" in c else None
listen_port = int(c["listen_port"]) if "listen_port" in c else None
if port != None:
listen_port = port
interface = TCPInterface.TCPServerInterface(
RNS.Transport,
name,
device,
listen_ip,
listen_port
)
if "outgoing" in c and c.as_bool("outgoing") == True:
interface.OUT = True
else:
interface.OUT = False
RNS.Transport.interfaces.append(interface)
if c["type"] == "TCPClientInterface":
interface = TCPInterface.TCPClientInterface(
RNS.Transport,
name,
c["target_host"],
int(c["target_port"])
)
if "outgoing" in c and c.as_bool("outgoing") == True:
interface.OUT = True
else:
interface.OUT = False
RNS.Transport.interfaces.append(interface)
if c["type"] == "SerialInterface":
port = c["port"] if "port" in c else None
speed = int(c["speed"]) if "speed" in c else 9600
databits = int(c["databits"]) if "databits" in c else 8
parity = c["parity"] if "parity" in c else "N"
stopbits = int(c["stopbits"]) if "stopbits" in c else 1
if port == None:
raise ValueError("No port specified for serial interface")
interface = SerialInterface.SerialInterface(
RNS.Transport,
name,
port,
speed,
databits,
parity,
stopbits
)
if "outgoing" in c and c["outgoing"].lower() == "true":
interface.OUT = True
else:
interface.OUT = False
RNS.Transport.interfaces.append(interface)
if c["type"] == "KISSInterface":
preamble = int(c["preamble"]) if "preamble" in c else None
txtail = int(c["txtail"]) if "txtail" in c else None
persistence = int(c["persistence"]) if "persistence" in c else None
slottime = int(c["slottime"]) if "slottime" in c else None
flow_control = c.as_bool("flow_control") if "flow_control" in c else False
port = c["port"] if "port" in c else None
speed = int(c["speed"]) if "speed" in c else 9600
databits = int(c["databits"]) if "databits" in c else 8
parity = c["parity"] if "parity" in c else "N"
stopbits = int(c["stopbits"]) if "stopbits" in c else 1
beacon_interval = int(c["id_interval"]) if "id_interval" in c else None
beacon_data = c["id_callsign"] if "id_callsign" in c else None
if port == None:
raise ValueError("No port specified for serial interface")
interface = KISSInterface.KISSInterface(
RNS.Transport,
name,
port,
speed,
databits,
parity,
stopbits,
preamble,
txtail,
persistence,
slottime,
flow_control,
beacon_interval,
beacon_data
)
if "outgoing" in c and c["outgoing"].lower() == "true":
interface.OUT = True
else:
interface.OUT = False
RNS.Transport.interfaces.append(interface)
if c["type"] == "AX25KISSInterface":
preamble = int(c["preamble"]) if "preamble" in c else None
txtail = int(c["txtail"]) if "txtail" in c else None
persistence = int(c["persistence"]) if "persistence" in c else None
slottime = int(c["slottime"]) if "slottime" in c else None
flow_control = c.as_bool("flow_control") if "flow_control" in c else False
port = c["port"] if "port" in c else None
speed = int(c["speed"]) if "speed" in c else 9600
databits = int(c["databits"]) if "databits" in c else 8
parity = c["parity"] if "parity" in c else "N"
stopbits = int(c["stopbits"]) if "stopbits" in c else 1
callsign = c["callsign"] if "callsign" in c else ""
ssid = int(c["ssid"]) if "ssid" in c else -1
if port == None:
raise ValueError("No port specified for serial interface")
interface = AX25KISSInterface.AX25KISSInterface(
RNS.Transport,
name,
callsign,
ssid,
port,
speed,
databits,
parity,
stopbits,
preamble,
txtail,
persistence,
slottime,
flow_control
)
if "outgoing" in c and c["outgoing"].lower() == "true":
interface.OUT = True
else:
interface.OUT = False
RNS.Transport.interfaces.append(interface)
if c["type"] == "RNodeInterface":
frequency = int(c["frequency"]) if "frequency" in c else None
bandwidth = int(c["bandwidth"]) if "bandwidth" in c else None
txpower = int(c["txpower"]) if "txpower" in c else None
spreadingfactor = int(c["spreadingfactor"]) if "spreadingfactor" in c else None
codingrate = int(c["codingrate"]) if "codingrate" in c else None
flow_control = c.as_bool("flow_control") if "flow_control" in c else False
id_interval = int(c["id_interval"]) if "id_interval" in c else None
id_callsign = c["id_callsign"] if "id_callsign" in c else None
port = c["port"] if "port" in c else None
if port == None:
raise ValueError("No port specified for RNode interface")
interface = RNodeInterface.RNodeInterface(
RNS.Transport,
name,
port,
frequency = frequency,
bandwidth = bandwidth,
txpower = txpower,
sf = spreadingfactor,
cr = codingrate,
flow_control = flow_control,
id_interval = id_interval,
id_callsign = id_callsign
)
if "outgoing" in c and c["outgoing"].lower() == "true":
interface.OUT = True
else:
interface.OUT = False
RNS.Transport.interfaces.append(interface)
else:
RNS.log("Skipping disabled interface \""+name+"\"", RNS.LOG_NOTICE)
except Exception as e:
RNS.log("The interface \""+name+"\" could not be created. Check your configuration file for errors!", RNS.LOG_ERROR)
RNS.log("The contained exception was: "+str(e), RNS.LOG_ERROR)
RNS.panic()
else:
RNS.log("The interface name \""+name+"\" was already used. Check your configuration file for errors!", RNS.LOG_ERROR)
RNS.panic()
def __create_default_config(self):
self.config = ConfigObj(__default_rns_config__)
self.config.filename = Reticulum.configpath
if not os.path.isdir(Reticulum.configdir):
os.makedirs(Reticulum.configdir)
self.config.write()
self.__apply_config()
@staticmethod
def should_allow_unencrypted():
"""
Returns whether unencrypted links are allowed by the
current configuration.
:returns: True if the current running configuration allows downgrading links to plaintext. False if not.
"""
return Reticulum.__allow_unencrypted
@staticmethod
def should_use_implicit_proof():
"""
Returns whether proofs sent are explicit or implicit.
:returns: True if the current running configuration specifies to use implicit proofs. False if not.
"""
return Reticulum.__use_implicit_proof
@staticmethod
def transport_enabled():
"""
Returns whether Transport is enabled for the running
instance.
When Transport is enabled, Reticulum will
route traffic for other peers, respond to path requests
and pass announces over the network.
:returns: True if Transport is enabled, False if not.
"""
return Reticulum.__transport_enabled
# Default configuration file:
__default_rns_config__ = '''# This is the default Reticulum config file.
# You should probably edit it to include any additional,
# interfaces and settings you might need.
[reticulum]
# Don't allow unencrypted links by default.
# If you REALLY need to allow unencrypted links, for example
# for debug or regulatory purposes, this can be set to true.
# This directive is optional and can be removed for brevity.
allow_unencrypted = False
# If you enable Transport, your system will route traffic
# for other peers, pass announces and serve path requests.
# This should be done for systems that are suited to act
# as transport nodes, ie. if they are stationary and
# always-on. This directive is optional and can be removed
# for brevity.
enable_transport = False
# By default, the first program to launch the Reticulum
# Network Stack will create a shared instance, that other
# programs can communicate with. Only the shared instance
# opens all the configured interfaces directly, and other
# local programs communicate with the shared instance over
# a local socket. This is completely transparent to the
# user, and should generally be turned on. This directive
# is optional and can be removed for brevity.
share_instance = Yes
# If you want to run multiple *different* shared instances
# on the same system, you will need to specify a different
# shared instance port for each. The default is given below,
# and again, this option is optional and can be left out.
shared_instance_port = 37428
[logging]
# Valid log levels are 0 through 7:
# 0: Log only critical information
# 1: Log errors and lower log levels
# 2: Log warnings and lower log levels
# 3: Log notices and lower log levels
# 4: Log info and lower (this is the default)
# 5: Verbose logging
# 6: Debug logging
# 7: Extreme logging
loglevel = 4
# The interfaces section defines the physical and virtual
# interfaces Reticulum will use to communicate on. This
# section will contain examples for a variety of interface
# types. You can modify these or use them as a basis for
# your own config, or simply remove the unused ones.
[interfaces]
# This interface enables communication with other
# local Reticulum nodes over UDP. You can modify it
# to suit your needs or turn it off completely.
# As a minimum, you should probably specify the
# network device you want to communicate on, such
# as eth0 or wlan0.
[[Default UDP Interface]]
type = UDPInterface
interface_enabled = True
outgoing = True
listen_ip = 0.0.0.0
listen_port = 4242
forward_ip = 255.255.255.255
forward_port = 4242
# The above configuration will allow communication
# within the local broadcast domains of all local
# IP interfaces. This is enabled by default as an
# easy way to get started, but you might want to
# consider altering it to something more specific.
# Instead of specifying listen_ip, listen_port,
# forward_ip and forward_port, you can also bind
# to a specific network device like below.
# device = eth0
# port = 4242
# Assuming the eth0 device has the address
# 10.55.0.72/24, the above configuration would
# be equivalent to the following manual setup.
# Note that we are both listening and forwarding to
# the broadcast address of the network segments.
# listen_ip = 10.55.0.255
# listen_port = 4242
# forward_ip = 10.55.0.255
# forward_port = 4242
# You can of course also communicate only with
# a single IP address
# listen_ip = 10.55.0.15
# listen_port = 4242
# forward_ip = 10.55.0.16
# forward_port = 4242
# This example demonstrates a TCP server interface.
# It will listen for incoming connections on the
# specified IP address and port number.
[[TCP Server Interface]]
type = TCPServerInterface
interface_enabled = False
outgoing = True
# This configuration will listen on all IP
# interfaces on port 4242
listen_ip = 0.0.0.0
listen_port = 4242
# Alternatively you can bind to a specific IP
# listen_ip = 10.0.0.88
# listen_port = 4242
# Or a specific network device
# device = eth0
# port = 4242
# To connect to a TCP server interface, you would
# naturally use the TCP client interface. Here's
# an example. The target_host can either be an IP
# address or a hostname
[[TCP Client Interface]]
type = TCPClientInterface
interface_enabled = False
outgoing = True
target_host = 127.0.0.1
target_port = 4242
# Here's an example of how to add a LoRa interface
# using the RNode LoRa transceiver.
[[RNode LoRa Interface]]
type = RNodeInterface
# Enable interface if you want use it!
interface_enabled = False
# Allow transmit on interface. Setting
# this to false will create a listen-
# only interface.
outgoing = true
# Serial port for the device
port = /dev/ttyUSB0
# Set frequency to 867.2 MHz
frequency = 867200000
# Set LoRa bandwidth to 125 KHz
bandwidth = 125000
# Set TX power to 7 dBm (5 mW)
txpower = 7
# Select spreading factor 8. Valid
# range is 7 through 12, with 7
# being the fastest and 12 having
# the longest range.
spreadingfactor = 8
# Select coding rate 5. Valid range
# is 5 throough 8, with 5 being the
# fastest, and 8 the longest range.
codingrate = 5
# You can configure the RNode to send
# out identification on the channel with
# a set interval by configuring the
# following two parameters. The trans-
# ceiver will only ID if the set
# interval has elapsed since it's last
# actual transmission. The interval is
# configured in seconds.
# This option is commented out and not
# used by default.
# id_callsign = MYCALL-0
# id_interval = 600
# For certain homebrew RNode interfaces
# with low amounts of RAM, using packet
# flow control can be useful. By default
# it is disabled.
flow_control = False
# An example KISS modem interface. Useful for running
# Reticulum over packet radio hardware.
[[Packet Radio KISS Interface]]
type = KISSInterface
# Enable interface if you want use it!
interface_enabled = False
# Allow transmit on interface.
outgoing = true
# Serial port for the device
port = /dev/ttyUSB1
# Set the serial baud-rate and other
# configuration parameters.
speed = 115200
databits = 8
parity = none
stopbits = 1
# Set the modem preamble. A 150ms
# preamble should be a reasonable
# default, but may need to be
# increased for radios with slow-
# opening squelch and long TX/RX
# turnaround
preamble = 150
# Set the modem TX tail. In most
# cases this should be kept as low
# as possible to not waste airtime.
txtail = 10
# Configure CDMA parameters. These
# settings are reasonable defaults.
persistence = 200
slottime = 20
# You can configure the interface to send
# out identification on the channel with
# a set interval by configuring the
# following two parameters. The KISS
# interface will only ID if the set
# interval has elapsed since it's last
# actual transmission. The interval is
# configured in seconds.
# This option is commented out and not
# used by default.
# id_callsign = MYCALL-0
# id_interval = 600
# Whether to use KISS flow-control.
# This is useful for modems that have
# a small internal packet buffer, but
# support packet flow control instead.
flow_control = false
# If you're using Reticulum on amateur radio spectrum,
# you might want to use the AX.25 KISS interface. This
# way, Reticulum will automatically encapsulate it's
# traffic in AX.25 and also identify your stations
# transmissions with your callsign and SSID.
#
# Only do this if you really need to! Reticulum doesn't
# need the AX.25 layer for anything, and it incurs extra
# overhead on every packet to encapsulate in AX.25.
#
# A more efficient way is to use the plain KISS interface
# with the beaconing functionality described above.
[[Packet Radio AX.25 KISS Interface]]
type = AX25KISSInterface
# Set the station callsign and SSID
callsign = NO1CLL
ssid = 0
# Enable interface if you want use it!
interface_enabled = False
# Allow transmit on interface.
outgoing = true
# Serial port for the device
port = /dev/ttyUSB2
# Set the serial baud-rate and other
# configuration parameters.
speed = 115200
databits = 8
parity = none
stopbits = 1
# Whether to use KISS flow-control.
# This is useful for modems with a
# small internal packet buffer.
flow_control = false
# Set the modem preamble. A 150ms
# preamble should be a reasonable
# default, but may need to be
# increased for radios with slow-
# opening squelch and long TX/RX
# turnaround
preamble = 150
# Set the modem TX tail. In most
# cases this should be kept as low
# as possible to not waste airtime.
txtail = 10
# Configure CDMA parameters. These
# settings are reasonable defaults.
persistence = 200
slottime = 20
'''.splitlines()
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