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Added ratchets example
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Mark Qvist
parent
a11f14e75f
commit
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343
Examples/Ratchets.py
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343
Examples/Ratchets.py
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##########################################################
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# This RNS example demonstrates a simple client/server #
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# echo utility that uses ratchets to rotate encryption #
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# keys everytime an announce is sent. #
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##########################################################
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import argparse
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import RNS
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# Let's define an app name. We'll use this for all
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# destinations we create. Since this echo example
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# is part of a range of example utilities, we'll put
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# them all within the app namespace "example_utilities"
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APP_NAME = "example_utilities"
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##########################################################
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#### Server Part #########################################
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##########################################################
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# This initialisation is executed when the users chooses
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# to run as a server
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def server(configpath):
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global reticulum
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# We must first initialise Reticulum
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reticulum = RNS.Reticulum(configpath)
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# TODO: Remove
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RNS.loglevel = RNS.LOG_DEBUG
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# Randomly create a new identity for our echo server
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server_identity = RNS.Identity()
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# We create a destination that clients can query. We want
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# to be able to verify echo replies to our clients, so we
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# create a "single" destination that can receive encrypted
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# messages. This way the client can send a request and be
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# certain that no-one else than this destination was able
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# to read it.
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echo_destination = RNS.Destination(
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server_identity,
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RNS.Destination.IN,
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RNS.Destination.SINGLE,
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APP_NAME,
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"ratchet",
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"echo",
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"request"
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)
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# Enable ratchets on the destination by providing a file
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# path to store ratchets. In this example, we will just
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# use a temporary file, but in real-world applications,
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# it's extremely important to keep this file secure, since
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# it contains encryption keys for the destination.
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destination_hexhash = RNS.hexrep(echo_destination.hash, delimit=False)
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echo_destination.enable_ratchets(f"/tmp/{destination_hexhash}.ratchets")
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# We configure the destination to automatically prove all
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# packets addressed to it. By doing this, RNS will automatically
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# generate a proof for each incoming packet and transmit it
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# back to the sender of that packet.
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echo_destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
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# Tell the destination which function in our program to
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# run when a packet is received. We do this so we can
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# print a log message when the server receives a request
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echo_destination.set_packet_callback(server_callback)
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# Everything's ready!
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# Let's Wait for client requests or user input
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announceLoop(echo_destination)
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def announceLoop(destination):
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# Let the user know that everything is ready
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RNS.log(
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"Ratcheted echo server "+
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RNS.prettyhexrep(destination.hash)+
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" running, hit enter to manually send an announce (Ctrl-C to quit)"
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)
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# We enter a loop that runs until the users exits.
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# If the user hits enter, we will announce our server
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# destination on the network, which will let clients
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# know how to create messages directed towards it.
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while True:
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entered = input()
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destination.announce()
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RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
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def server_callback(message, packet):
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global reticulum
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# Tell the user that we received an echo request, and
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# that we are going to send a reply to the requester.
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# Sending the proof is handled automatically, since we
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# set up the destination to prove all incoming packets.
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reception_stats = ""
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if reticulum.is_connected_to_shared_instance:
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reception_rssi = reticulum.get_packet_rssi(packet.packet_hash)
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reception_snr = reticulum.get_packet_snr(packet.packet_hash)
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if reception_rssi != None:
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reception_stats += " [RSSI "+str(reception_rssi)+" dBm]"
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if reception_snr != None:
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reception_stats += " [SNR "+str(reception_snr)+" dBm]"
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else:
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if packet.rssi != None:
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reception_stats += " [RSSI "+str(packet.rssi)+" dBm]"
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if packet.snr != None:
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reception_stats += " [SNR "+str(packet.snr)+" dB]"
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RNS.log("Received packet from echo client, proof sent"+reception_stats)
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##########################################################
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#### Client Part #########################################
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##########################################################
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# This initialisation is executed when the users chooses
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# to run as a client
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def client(destination_hexhash, configpath, timeout=None):
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global reticulum
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# We need a binary representation of the destination
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# hash that was entered on the command line
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try:
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dest_len = (RNS.Reticulum.TRUNCATED_HASHLENGTH//8)*2
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if len(destination_hexhash) != dest_len:
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raise ValueError(
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"Destination length is invalid, must be {hex} hexadecimal characters ({byte} bytes).".format(hex=dest_len, byte=dest_len//2)
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)
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destination_hash = bytes.fromhex(destination_hexhash)
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except Exception as e:
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RNS.log("Invalid destination entered. Check your input!")
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RNS.log(str(e)+"\n")
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exit()
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# We must first initialise Reticulum
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reticulum = RNS.Reticulum(configpath)
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# We override the loglevel to provide feedback when
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# an announce is received
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if RNS.loglevel < RNS.LOG_INFO:
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RNS.loglevel = RNS.LOG_INFO
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# Tell the user that the client is ready!
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RNS.log(
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"Echo client ready, hit enter to send echo request to "+
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destination_hexhash+
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" (Ctrl-C to quit)"
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)
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# We enter a loop that runs until the user exits.
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# If the user hits enter, we will try to send an
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# echo request to the destination specified on the
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# command line.
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while True:
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input()
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# Let's first check if RNS knows a path to the destination.
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# If it does, we'll load the server identity and create a packet
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if RNS.Transport.has_path(destination_hash):
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# To address the server, we need to know it's public
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# key, so we check if Reticulum knows this destination.
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# This is done by calling the "recall" method of the
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# Identity module. If the destination is known, it will
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# return an Identity instance that can be used in
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# outgoing destinations.
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server_identity = RNS.Identity.recall(destination_hash)
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# We got the correct identity instance from the
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# recall method, so let's create an outgoing
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# destination. We use the naming convention:
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# example_utilities.ratchet.echo.request
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# This matches the naming we specified in the
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# server part of the code.
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request_destination = RNS.Destination(
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server_identity,
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RNS.Destination.OUT,
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RNS.Destination.SINGLE,
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APP_NAME,
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"ratchet",
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"echo",
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"request"
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)
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# The destination is ready, so let's create a packet.
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# We set the destination to the request_destination
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# that was just created, and the only data we add
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# is a random hash.
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echo_request = RNS.Packet(request_destination, RNS.Identity.get_random_hash())
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# Send the packet! If the packet is successfully
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# sent, it will return a PacketReceipt instance.
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packet_receipt = echo_request.send()
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# If the user specified a timeout, we set this
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# timeout on the packet receipt, and configure
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# a callback function, that will get called if
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# the packet times out.
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if timeout != None:
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packet_receipt.set_timeout(timeout)
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packet_receipt.set_timeout_callback(packet_timed_out)
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# We can then set a delivery callback on the receipt.
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# This will get automatically called when a proof for
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# this specific packet is received from the destination.
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packet_receipt.set_delivery_callback(packet_delivered)
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# Tell the user that the echo request was sent
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RNS.log("Sent echo request to "+RNS.prettyhexrep(request_destination.hash))
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else:
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# If we do not know this destination, tell the
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# user to wait for an announce to arrive.
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RNS.log("Destination is not yet known. Requesting path...")
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RNS.log("Hit enter to manually retry once an announce is received.")
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RNS.Transport.request_path(destination_hash)
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# This function is called when our reply destination
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# receives a proof packet.
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def packet_delivered(receipt):
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global reticulum
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if receipt.status == RNS.PacketReceipt.DELIVERED:
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rtt = receipt.get_rtt()
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if (rtt >= 1):
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rtt = round(rtt, 3)
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rttstring = str(rtt)+" seconds"
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else:
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rtt = round(rtt*1000, 3)
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rttstring = str(rtt)+" milliseconds"
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reception_stats = ""
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if reticulum.is_connected_to_shared_instance:
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reception_rssi = reticulum.get_packet_rssi(receipt.proof_packet.packet_hash)
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reception_snr = reticulum.get_packet_snr(receipt.proof_packet.packet_hash)
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if reception_rssi != None:
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reception_stats += " [RSSI "+str(reception_rssi)+" dBm]"
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if reception_snr != None:
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reception_stats += " [SNR "+str(reception_snr)+" dB]"
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else:
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if receipt.proof_packet != None:
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if receipt.proof_packet.rssi != None:
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reception_stats += " [RSSI "+str(receipt.proof_packet.rssi)+" dBm]"
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if receipt.proof_packet.snr != None:
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reception_stats += " [SNR "+str(receipt.proof_packet.snr)+" dB]"
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RNS.log(
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"Valid reply received from "+
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RNS.prettyhexrep(receipt.destination.hash)+
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", round-trip time is "+rttstring+
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reception_stats
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)
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# This function is called if a packet times out.
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def packet_timed_out(receipt):
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if receipt.status == RNS.PacketReceipt.FAILED:
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RNS.log("Packet "+RNS.prettyhexrep(receipt.hash)+" timed out")
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##########################################################
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#### Program Startup #####################################
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##########################################################
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# This part of the program gets run at startup,
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# and parses input from the user, and then starts
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# the desired program mode.
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if __name__ == "__main__":
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try:
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parser = argparse.ArgumentParser(description="Simple ratcheted echo server and client utility")
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parser.add_argument(
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"-s",
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"--server",
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action="store_true",
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help="wait for incoming packets from clients"
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)
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parser.add_argument(
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"-t",
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"--timeout",
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action="store",
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metavar="s",
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default=None,
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help="set a reply timeout in seconds",
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type=float
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)
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parser.add_argument("--config",
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action="store",
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default=None,
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help="path to alternative Reticulum config directory",
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type=str
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)
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parser.add_argument(
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"destination",
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nargs="?",
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default=None,
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help="hexadecimal hash of the server destination",
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type=str
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)
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args = parser.parse_args()
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if args.server:
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configarg=None
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if args.config:
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configarg = args.config
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server(configarg)
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else:
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if args.config:
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configarg = args.config
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else:
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configarg = None
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if args.timeout:
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timeoutarg = float(args.timeout)
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else:
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timeoutarg = None
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if (args.destination == None):
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print("")
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parser.print_help()
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print("")
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else:
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client(args.destination, configarg, timeout=timeoutarg)
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except KeyboardInterrupt:
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print("")
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exit()
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