223 lines
9.3 KiB
Python
223 lines
9.3 KiB
Python
##########################################################
|
|
# This RNS example demonstrates a simple client/server #
|
|
# echo utility. A client can send an echo request to the #
|
|
# server, and the server will respond by proving receipt #
|
|
# of the packet. #
|
|
##########################################################
|
|
|
|
import argparse
|
|
import RNS
|
|
|
|
# Let's define an app name. We'll use this for all
|
|
# destinations we create. Since this echo example
|
|
# is part of a range of example utilities, we'll put
|
|
# them all within the app namespace "example_utilities"
|
|
APP_NAME = "example_utilities"
|
|
|
|
|
|
##########################################################
|
|
#### Server Part #########################################
|
|
##########################################################
|
|
|
|
# This initialisation is executed when the users chooses
|
|
# to run as a server
|
|
def server(configpath):
|
|
# We must first initialise Reticulum
|
|
reticulum = RNS.Reticulum(configpath)
|
|
|
|
# Randomly create a new identity for our echo server
|
|
server_identity = RNS.Identity()
|
|
|
|
# We create a destination that clients can query. We want
|
|
# to be able to verify echo replies to our clients, so we
|
|
# create a "single" destination that can receive encrypted
|
|
# messages. This way the client can send a request and be
|
|
# certain that no-one else than this destination was able
|
|
# to read it.
|
|
echo_destination = RNS.Destination(server_identity, RNS.Destination.IN, RNS.Destination.SINGLE, APP_NAME, "echo", "request")
|
|
|
|
# We configure the destination to automatically prove all
|
|
# packets adressed to it. By doing this, RNS will automatically
|
|
# generate a proof for each incoming packet and transmit it
|
|
# back to the sender of that packet.
|
|
echo_destination.set_proof_strategy(RNS.Destination.PROVE_ALL)
|
|
|
|
# Tell the destination which function in our program to
|
|
# run when a packet is received. We do this so we can
|
|
# print a log message when the server receives a request
|
|
echo_destination.packet_callback(server_callback)
|
|
|
|
# Everything's ready!
|
|
# Let's Wait for client requests or user input
|
|
announceLoop(echo_destination)
|
|
|
|
|
|
def announceLoop(destination):
|
|
# Let the user know that everything is ready
|
|
RNS.log("Echo server "+RNS.prettyhexrep(destination.hash)+" running, hit enter to manually send an announce (Ctrl-C to quit)")
|
|
|
|
# We enter a loop that runs until the users exits.
|
|
# If the user hits enter, we will announce our server
|
|
# destination on the network, which will let clients
|
|
# know how to create messages directed towards it.
|
|
while True:
|
|
entered = input()
|
|
destination.announce()
|
|
RNS.log("Sent announce from "+RNS.prettyhexrep(destination.hash))
|
|
|
|
|
|
def server_callback(message, packet):
|
|
# Tell the user that we received an echo request, and
|
|
# that we are going to send a reply to the requester.
|
|
# Sending the proof is handled automatically, since we
|
|
# set up the destination to prove all incoming packets.
|
|
RNS.log("Received packet from echo client, proof sent")
|
|
|
|
|
|
##########################################################
|
|
#### Client Part #########################################
|
|
##########################################################
|
|
|
|
# This initialisation is executed when the users chooses
|
|
# to run as a client
|
|
def client(destination_hexhash, configpath, timeout=None):
|
|
# We need a binary representation of the destination
|
|
# hash that was entered on the command line
|
|
try:
|
|
if len(destination_hexhash) != 20:
|
|
raise ValueError("Destination length is invalid, must be 20 hexadecimal characters (10 bytes)")
|
|
destination_hash = bytes.fromhex(destination_hexhash)
|
|
except:
|
|
RNS.log("Invalid destination entered. Check your input!\n")
|
|
exit()
|
|
|
|
# We must first initialise Reticulum
|
|
reticulum = RNS.Reticulum(configpath)
|
|
|
|
# We override the loglevel to provide feedback when
|
|
# an announce is received
|
|
if RNS.loglevel < RNS.LOG_INFO:
|
|
RNS.loglevel = RNS.LOG_INFO
|
|
|
|
# Tell the user that the client is ready!
|
|
RNS.log("Echo client ready, hit enter to send echo request to "+destination_hexhash+" (Ctrl-C to quit)")
|
|
|
|
# We enter a loop that runs until the user exits.
|
|
# If the user hits enter, we will try to send an
|
|
# echo request to the destination specified on the
|
|
# command line.
|
|
while True:
|
|
input()
|
|
|
|
# Let's first check if RNS knows a path to the destination.
|
|
# If it does, we'll load the server identity and create a packet
|
|
if RNS.Transport.has_path(destination_hash):
|
|
|
|
# To address the server, we need to know it's public
|
|
# key, so we check if Reticulum knows this destination.
|
|
# This is done by calling the "recall" method of the
|
|
# Identity module. If the destination is known, it will
|
|
# return an Identity instance that can be used in
|
|
# outgoing destinations.
|
|
server_identity = RNS.Identity.recall(destination_hash)
|
|
|
|
# We got the correct identity instance from the
|
|
# recall method, so let's create an outgoing
|
|
# destination. We use the naming convention:
|
|
# example_utilities.echo.request
|
|
# This matches the naming we specified in the
|
|
# server part of the code.
|
|
request_destination = RNS.Destination(server_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, APP_NAME, "echo", "request")
|
|
|
|
# The destination is ready, so let's create a packet.
|
|
# We set the destination to the request_destination
|
|
# that was just created, and the only data we add
|
|
# is a random hash.
|
|
echo_request = RNS.Packet(request_destination, RNS.Identity.get_random_hash())
|
|
|
|
# Send the packet! If the packet is successfully
|
|
# sent, it will return a PacketReceipt instance.
|
|
packet_receipt = echo_request.send()
|
|
|
|
# If the user specified a timeout, we set this
|
|
# timeout on the packet receipt, and configure
|
|
# a callback function, that will get called if
|
|
# the packet times out.
|
|
if timeout != None:
|
|
packet_receipt.set_timeout(timeout)
|
|
packet_receipt.timeout_callback(packet_timed_out)
|
|
|
|
# We can then set a delivery callback on the receipt.
|
|
# This will get automatically called when a proof for
|
|
# this specific packet is received from the destination.
|
|
packet_receipt.delivery_callback(packet_delivered)
|
|
|
|
# Tell the user that the echo request was sent
|
|
RNS.log("Sent echo request to "+RNS.prettyhexrep(request_destination.hash))
|
|
else:
|
|
# If we do not know this destination, tell the
|
|
# user to wait for an announce to arrive.
|
|
RNS.log("Destination is not yet known. Requesting path...")
|
|
RNS.Transport.request_path(destination_hash)
|
|
|
|
# This function is called when our reply destination
|
|
# receives a proof packet.
|
|
def packet_delivered(receipt):
|
|
if receipt.status == RNS.PacketReceipt.DELIVERED:
|
|
rtt = receipt.rtt()
|
|
if (rtt >= 1):
|
|
rtt = round(rtt, 3)
|
|
rttstring = str(rtt)+" seconds"
|
|
else:
|
|
rtt = round(rtt*1000, 3)
|
|
rttstring = str(rtt)+" milliseconds"
|
|
|
|
RNS.log("Valid reply received from "+RNS.prettyhexrep(receipt.destination.hash)+", round-trip time is "+rttstring)
|
|
|
|
# This function is called if a packet times out.
|
|
def packet_timed_out(receipt):
|
|
if receipt.status == RNS.PacketReceipt.FAILED:
|
|
RNS.log("Packet "+RNS.prettyhexrep(receipt.hash)+" timed out")
|
|
|
|
|
|
##########################################################
|
|
#### Program Startup #####################################
|
|
##########################################################
|
|
|
|
# This part of the program gets run at startup,
|
|
# and parses input from the user, and then starts
|
|
# the desired program mode.
|
|
if __name__ == "__main__":
|
|
try:
|
|
parser = argparse.ArgumentParser(description="Simple echo server and client utility")
|
|
parser.add_argument("-s", "--server", action="store_true", help="wait for incoming packets from clients")
|
|
parser.add_argument("-t", "--timeout", action="store", metavar="s", default=None, help="set a reply timeout in seconds", type=float)
|
|
parser.add_argument("--config", action="store", default=None, help="path to alternative Reticulum config directory", type=str)
|
|
parser.add_argument("destination", nargs="?", default=None, help="hexadecimal hash of the server destination", type=str)
|
|
args = parser.parse_args()
|
|
|
|
if args.server:
|
|
configarg=None
|
|
if args.config:
|
|
configarg = args.config
|
|
server(configarg)
|
|
else:
|
|
if args.config:
|
|
configarg = args.config
|
|
else:
|
|
configarg = None
|
|
|
|
if args.timeout:
|
|
timeoutarg = float(args.timeout)
|
|
else:
|
|
timeoutarg = None
|
|
|
|
if (args.destination == None):
|
|
print("")
|
|
parser.print_help()
|
|
print("")
|
|
else:
|
|
client(args.destination, configarg, timeout=timeoutarg)
|
|
except KeyboardInterrupt:
|
|
print("")
|
|
exit() |