1217 lines
50 KiB
Python
1217 lines
50 KiB
Python
# Copyright (C) 2020 by eichhornchen, ÿnérant
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# SPDX-License-Identifier: GPL-3.0-or-later
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from datetime import datetime
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from random import randint, uniform
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from typing import Any, Tuple, Generator
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from threading import Thread, Semaphore
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import curses
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import re
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import socket
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import time
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import struct
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from .messages import Packet, DataTLV, HelloTLV, GoAwayTLV, GoAwayType, NeighbourTLV, WarningTLV
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class Peer:
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"""
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A connected peer, with its socket.
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"""
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def __init__(self, nickname: str = None, address: str = "localhost", port: int = 2500):
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self.nickname = nickname
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self.id = -1
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self.last_hello_time = 0
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self.last_long_hello_time = 0
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self.symmetric = False
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self.active = False
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self.errors = 0
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try:
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# Resolve DNS as an IPv6
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address = socket.getaddrinfo(address, None, socket.AF_INET6)[0][4][0]
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except socket.gaierror:
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# This is not a valid IPv6. Assume it can be resolved as an IPv4, and we use IPv4-mapping
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# to compute a valid IPv6.
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# See https://fr.wikipedia.org/wiki/Adresse_IPv6_mappant_IPv4
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address = "::ffff:" + socket.getaddrinfo(address, None, socket.AF_INET)[0][4][0]
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self.addresses = set()
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self.addresses.add((address, port))
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self.main_address = (address, port)
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@property
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def potential(self) -> bool:
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return not self.active and not self.banned and not isinstance(self, User)
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@potential.setter
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def potential(self, value: bool) -> None:
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self.active = not value
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@property
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def banned(self) -> bool:
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"""
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If a client send more than 5 invalid packets, we don't trust it anymore.
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"""
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return self.errors >= 5 or isinstance(self, User)
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def __repr__(self):
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return self.nickname or str(self.id) or str(self.main_address)
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def __str__(self):
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return repr(self)
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def merge(self, other: "Peer") -> "Peer":
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"""
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Merge two peers that are actually the same client.
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The symmetric and active properties are kept from the original client.
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"""
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self.errors = max(self.errors, other.errors)
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self.last_hello_time = max(self.last_hello_time, other.last_hello_time)
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self.last_long_hello_time = max(self.last_hello_time, other.last_long_hello_time)
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self.addresses.update(self.addresses)
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self.addresses.update(other.addresses)
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if self.main_address[1] == 1212: # always prefer the non-multicast address
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self.main_address = other.main_address
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elif other.main_address[1] == 1212:
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other.main_address = self.main_address
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self.id = self.id if self.id > 0 else other.id
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return self
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class User(Peer):
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"""
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The user of the program. It can speak with other peers.
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"""
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def __init__(self, instance: Any, nickname: str):
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super().__init__(nickname, instance.bind_address, instance.bind_port)
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# Random identifier on 64 bits
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self.id = randint(0, 1 << 64 - 1)
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self.incr_nonce = 0
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# Create UDP socket
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self.socket = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
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# Bind the socket
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self.socket.bind(self.main_address)
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self.squinnondation = instance
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if self.squinnondation.multicast:
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# Create multicast socket
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self.multicast_socket = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
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# Allows address to be reused
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self.multicast_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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self.multicast_socket.bind(('', 1212)) # listen on all interfaces?
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# To join the group, we need to give setsockopt a binary packed representation of the multicast
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# group's address and on what interfaces we will listen (here all)
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mreq = struct.pack("16s15s", socket.inet_pton(socket.AF_INET6, "ff02::4242:4242"), bytes(socket.INADDR_ANY))
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# The string "16s15s" corresponds to the packing options: here it packs the arguments into a 16-byte
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# string and a 15-byte string.
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self.multicast_socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)
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self.input_buffer = ""
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self.input_index = 0
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self.last_line = -1
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# Lock the refresh function in order to avoid concurrent refresh
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self.refresh_lock = Semaphore()
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# Lock functions that can be used by two threads to avoid concurrent writing
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self.data_lock = Semaphore()
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self.history = []
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self.received_messages = dict()
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self.recent_messages = dict() # of the form [Pkt(DataTLV), date of first reception,
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# dict(neighbour, date of the next send, nb of times it has already been sent)]
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self.history_pad = curses.newpad(curses.LINES - 2, curses.COLS)
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self.input_pad = curses.newpad(1, curses.COLS)
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self.emoji_pad = curses.newpad(18, 12)
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self.emoji_panel_page = -1
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if curses.can_change_color():
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curses.init_color(curses.COLOR_WHITE, 1000, 1000, 1000)
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for i in range(curses.COLOR_BLACK + 1, curses.COLOR_WHITE):
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curses.init_pair(i + 1, i, curses.COLOR_BLACK)
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# dictionnaries of neighbours
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self.neighbours = {self.main_address: self}
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self.nbNS = 0
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self.minNS = 3 # minimal number of symmetric neighbours a user needs to have.
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self.listener = Listener(self)
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self.neighbour_manager = PeerManager(self)
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self.inondator = Inondator(self)
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if self.squinnondation.multicast:
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self.multicastlistener = Multicastlistener(self)
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self.add_system_message(f"Listening on {self.main_address[0]}:{self.main_address[1]}", ignore_debug=True)
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self.add_system_message(f"I am {self.id}")
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def new_peer(self, address: str, port: int) -> Peer:
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"""
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Returns a new peer (with no id nor nickname)
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"""
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peer = Peer(address=address, port=port)
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return peer
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@property
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def active_peers(self) -> set:
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return set(peer for peer in self.neighbours.values() if peer.active)
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@property
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def potential_peers(self) -> set:
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return set(peer for peer in self.neighbours.values() if peer.potential)
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def find_peer(self, address: str, port: int) -> Peer:
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"""
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Translate an address into a peer. If this peer does not exist,
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creates a new peer.
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"""
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if (address, port) in self.neighbours:
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return self.neighbours[(address, port)]
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self.data_lock.acquire(timeout=1)
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peer = Peer(address=address, port=port)
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self.neighbours[(address, port)] = peer
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self.data_lock.release()
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return peer
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def find_peer_by_id(self, peer_id: int) -> Peer:
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"""
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Retrieve the peer that is known by its id. Return None if it is unknown.
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The given identifier must be positive.
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"""
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if peer_id > 0:
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for peer in self.neighbours.values():
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if peer.id == peer_id:
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return peer
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def find_peer_by_nickname(self, nickname: str) -> Generator[Peer, Any, None]:
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"""
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Retrieve the peers that are known by their nicknames.
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"""
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for peer in self.neighbours.values():
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if peer.nickname == nickname:
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yield peer
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def send_packet(self, client: Peer, pkt: Packet) -> int:
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"""
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Send a formatted packet to a client.
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"""
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if len(pkt) > 1024:
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# The packet is too large to be sent by the protocol. We split the packet in subpackets.
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return sum(self.send_packet(client, subpkt) for subpkt in pkt.split(1024))
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res = self.send_raw_data(client, pkt.marshal())
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return res
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def send_raw_data(self, client: Peer, data: bytes) -> int:
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"""
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Send a raw packet to a client.
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"""
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return self.socket.sendto(data, client.main_address)
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def receive_packet(self) -> Tuple[Packet, Peer]:
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"""
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Receive a packet from the socket and translate it into a Python object.
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Warning: the process is blocking, it should be ran inside a dedicated thread.
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"""
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data, addr = self.receive_raw_data()
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peer = self.find_peer(addr[0], addr[1])
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if peer.banned:
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# The client already sent errored packets
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return Packet.construct(), peer
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try:
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pkt = Packet.unmarshal(data)
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except ValueError as error:
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# The packet contains an error. We memorize it and warn the other user.
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peer.errors += 1
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self.send_packet(peer, Packet.construct(WarningTLV.construct(
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f"An error occured while reading your packet: {error}")))
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if peer.banned:
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self.send_packet(peer, Packet.construct(WarningTLV.construct(
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"You got banned since you sent too much errored packets.")))
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raise ValueError("Client is banned since there were too many errors.", error)
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raise error
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else:
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return pkt, peer
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def receive_raw_data(self) -> Tuple[bytes, Any]:
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"""
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Receive a packet from the socket.
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"""
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return self.socket.recvfrom(1024)
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def start_threads(self) -> None:
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"""
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Start asynchronous threads.
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"""
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# Kill subthreads when exitting the program
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self.listener.setDaemon(True)
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self.neighbour_manager.setDaemon(True)
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self.inondator.setDaemon(True)
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self.listener.start()
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self.neighbour_manager.start()
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self.inondator.start()
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if self.squinnondation.multicast:
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self.multicastlistener.setDaemon(True)
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self.multicastlistener.start()
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def wait_for_key(self) -> None:
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"""
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Infinite loop where we are waiting for a key of the user.
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"""
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while True:
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self.refresh_history()
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self.refresh_input()
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self.refresh_emoji_pad()
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if not self.squinnondation.no_emoji:
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self.refresh_emoji_pad()
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try:
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key = self.squinnondation.screen.get_wch(
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curses.LINES - 1, min(3 + len(self.nickname) + self.input_index, curses.COLS - 4))
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except curses.error:
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continue
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except KeyboardInterrupt:
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# Exit the program and send GoAway to neighbours
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self.leave()
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return
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if key == curses.KEY_MOUSE:
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try:
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_, x, y, _, attr = curses.getmouse()
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self.handle_mouse_click(y, x, attr)
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continue
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except curses.error:
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# This is not a valid click
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continue
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self.handle_key_pressed(key)
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def handle_key_pressed(self, key: str) -> None: # noqa: C901
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"""
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Process the key press from the user.
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"""
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if key == "\x7f" or key == curses.KEY_BACKSPACE: # backspace
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# delete character at the good position
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if self.input_index:
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self.input_index -= 1
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self.input_buffer = self.input_buffer[:self.input_index] + self.input_buffer[self.input_index + 1:]
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return
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elif key == curses.KEY_DC: # key
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if self.input_index < len(self.input_buffer):
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self.input_buffer = self.input_buffer[:self.input_index] + self.input_buffer[self.input_index + 1:]
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return
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elif key == curses.KEY_LEFT:
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# Navigate in the message to the left
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self.input_index = max(0, self.input_index - 1)
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return
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elif key == curses.KEY_RIGHT:
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# Navigate in the message to the right
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self.input_index = min(len(self.input_buffer), self.input_index + 1)
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return
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elif key == curses.KEY_UP:
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# Scroll up in the history
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self.last_line = min(max(curses.LINES - 3, self.last_line - 1), len(self.history) - 1)
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return
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elif key == curses.KEY_DOWN:
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# Scroll down in the history
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self.last_line = min(len(self.history) - 1, self.last_line + 1)
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return
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elif key == curses.KEY_PPAGE:
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# Page up in the history
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self.last_line = min(max(curses.LINES - 3, self.last_line - (curses.LINES - 3)), len(self.history) - 1)
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return
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elif key == curses.KEY_NPAGE:
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# Page down in the history
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self.last_line = min(len(self.history) - 1, self.last_line + (curses.LINES - 3))
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return
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elif key == curses.KEY_HOME:
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# Place the cursor at the beginning of the typing word
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self.input_index = 0
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return
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elif key == curses.KEY_END:
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# Place the cursor at the end of the typing word
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self.input_index = len(self.input_buffer)
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return
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elif isinstance(key, int):
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# Unmanaged complex key
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return
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elif key != "\n":
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# Insert the pressed key in the current message
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new_buffer = self.input_buffer[:self.input_index] + key + self.input_buffer[self.input_index:]
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if len(DataTLV.construct(f"{self.nickname}: {new_buffer}", None)) > 255 - 8 - 4:
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# The message is too long to be sent once. We don't allow the user to type any other character.
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curses.beep()
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return
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self.input_buffer = new_buffer
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self.input_index += 1
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return
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# Send message to neighbours
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msg = self.input_buffer
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self.input_buffer = ""
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self.input_index = 0
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if not msg:
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return
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if msg.startswith("/"):
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return self.handle_command(msg[1:])
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msg = f"{self.nickname}: {msg}"
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self.add_message(msg)
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pkt = Packet.construct(DataTLV.construct(msg, self))
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for peer in self.active_peers:
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self.send_packet(peer, pkt)
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def handle_mouse_click(self, y: int, x: int, attr: int) -> None:
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"""
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The user clicks on the screen, at coordinates (y, x).
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According to the position, we can indicate what can be done.
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"""
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if not self.squinnondation.no_emoji:
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if y == curses.LINES - 1 and x >= curses.COLS - 3:
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# Click on the emoji, open or close the emoji pad
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self.emoji_panel_page *= -1
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elif self.emoji_panel_page > 0 and y == curses.LINES - 4 and x >= curses.COLS - 5:
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# Open next emoji page
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self.emoji_panel_page += 1
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elif self.emoji_panel_page > 1 and y == curses.LINES - curses.LINES // 2 - 1 \
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and x >= curses.COLS - 5:
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# Open previous emoji page
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self.emoji_panel_page -= 1
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elif self.emoji_panel_page > 0 and y >= curses.LINES // 2 - 1 and x >= curses.COLS // 2 - 1:
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pad_y, pad_x = y - (curses.LINES - curses.LINES // 2) + 1, \
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(x - (curses.COLS - curses.COLS // 3) + 1) // 2
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# Click on an emoji on the pad to autocomplete an emoji
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self.click_on_emoji_pad(pad_y, pad_x)
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def click_on_emoji_pad(self, pad_y: int, pad_x: int) -> None:
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"""
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The emoji pad contains the list of all available emojis.
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Clicking on a emoji auto-complete the emoji in the input pad.
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"""
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import emoji
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from emoji import unicode_codes
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height, width = self.emoji_pad.getmaxyx()
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height -= 1
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width -= 1
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emojis = list(unicode_codes.UNICODE_EMOJI)
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emojis = [c for c in emojis if len(c) == 1]
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size = (height - 2) * (width - 4) // 2
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page = emojis[(self.emoji_panel_page - 1) * size:self.emoji_panel_page * size]
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index = pad_y * (width - 4) // 2 + pad_x
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char = page[index]
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if char:
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demojized = emoji.demojize(char)
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if char != demojized:
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for c in reversed(demojized):
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curses.ungetch(c)
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def handle_command(self, command: str) -> None:
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"""
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The user sent a command. We analyse it and process what is needed.
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"""
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def resolve_address(address: str) -> str:
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# Resolve address
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try:
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# Resolve DNS as an IPv6
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return socket.getaddrinfo(address, None, socket.AF_INET6)[0][4][0]
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except socket.gaierror:
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# This is not a valid IPv6. Assume it can be resolved as an IPv4, and we use IPv4-mapping
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# to compute a valid IPv6.
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# See https://fr.wikipedia.org/wiki/Adresse_IPv6_mappant_IPv4
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try:
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return "::ffff:" + socket.getaddrinfo(address, None, socket.AF_INET)[0][4][0]
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except socket.gaierror:
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raise ValueError(f"{address} is not resolvable")
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def resolve_port(port: str) -> int:
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try:
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port = int(port)
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if not 1 <= port <= 65565:
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raise ValueError
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return port
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except ValueError:
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raise ValueError(f"{port} is not a valid port")
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args = command.split(" ")
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command, args = args[0].lower(), args[1:]
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if command == "help" or command == "usage":
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self.add_system_message("**/help**\t\t\t\tDisplay this help menu", italic=False, ignore_debug=True)
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self.add_system_message("**/connect address port**\t\tAdd this address in the potential neighbours",
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italic=False, ignore_debug=True)
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self.add_system_message("**/hello address port**\t\tSend short hello to the given neighbour",
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italic=False, ignore_debug=True)
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self.add_system_message("**/unban address port**\t\tReset the error counter of a given neighbour",
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italic=False, ignore_debug=True)
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self.add_system_message("**/info id|nickname|addr port**\tDisplay information about a neighbour",
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italic=False, ignore_debug=True)
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self.add_system_message("**/active**\t\t\tDisplay the list of all active neighbours.",
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italic=False, ignore_debug=True)
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self.add_system_message("**/potential**\t\t\tDisplay the list of all potential neighbours.",
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italic=False, ignore_debug=True)
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self.add_system_message("**/debug**\t\t\t\tToggle debug mode", italic=False, ignore_debug=True)
|
|
self.add_system_message("**/emojis**\t\t\tToggle emojis support", italic=False, ignore_debug=True)
|
|
self.add_system_message("**/markdown**\t\t\tToggle markdown support", italic=False, ignore_debug=True)
|
|
elif command == "connect":
|
|
if len(args) != 2:
|
|
self.add_system_message("Usage: /connect address port", italic=False, ignore_debug=True)
|
|
return
|
|
try:
|
|
address, port = resolve_address(args[0]), resolve_port(args[1])
|
|
except ValueError as e:
|
|
self.add_system_message(str(e), ignore_debug=True)
|
|
return
|
|
|
|
if (address, port) in self.neighbours:
|
|
self.add_system_message("There is already a known client with this address.", ignore_debug=True)
|
|
return
|
|
self.data_lock.acquire(timeout=1)
|
|
peer = self.new_peer(address, port)
|
|
self.neighbours[(address, port)] = peer
|
|
self.data_lock.release()
|
|
self.add_system_message(f"Potential client successfully added! You can send a hello by running "
|
|
f"\"/hello {address} {port}\".", ignore_debug=True)
|
|
elif command == "hello":
|
|
if len(args) != 2:
|
|
self.add_system_message("Usage: /hello address port", italic=False, ignore_debug=True)
|
|
return
|
|
try:
|
|
address, port = resolve_address(args[0]), resolve_port(args[1])
|
|
except ValueError as e:
|
|
self.add_system_message(str(e), ignore_debug=True)
|
|
return
|
|
|
|
if (address, port) not in self.neighbours:
|
|
self.add_system_message("This client is unknown. Please register it by running "
|
|
f"\"/connect {address} {port}\"", ignore_debug=True)
|
|
return
|
|
|
|
peer = self.find_peer(address, port)
|
|
self.send_packet(peer, Packet.construct(HelloTLV.construct(8, self)))
|
|
|
|
self.add_system_message("Hello successfully sent!", ignore_debug=True)
|
|
elif command == "unban":
|
|
if len(args) != 2:
|
|
self.add_system_message("Usage: /unban address port", italic=False, ignore_debug=True)
|
|
return
|
|
try:
|
|
address, port = resolve_address(args[0]), resolve_port(args[1])
|
|
except ValueError as e:
|
|
self.add_system_message(str(e), ignore_debug=True)
|
|
return
|
|
|
|
if (address, port) not in self.neighbours:
|
|
self.add_system_message("This client is unknown. Please register it by running "
|
|
f"\"/connect {address} {port}\"", ignore_debug=True)
|
|
return
|
|
|
|
peer = self.find_peer(address, port)
|
|
peer.errors = 0
|
|
|
|
self.add_system_message("The client is unbanned.", ignore_debug=True)
|
|
elif command == "info":
|
|
if len(args) > 2:
|
|
self.add_system_message("Usage: /info me|id|nickname|addr port", italic=False, ignore_debug=True)
|
|
return
|
|
|
|
if not args:
|
|
self.data_lock.acquire(timeout=1)
|
|
peers = [self]
|
|
self.data_lock.release()
|
|
elif len(args) == 2:
|
|
try:
|
|
address, port = resolve_address(args[0]), resolve_port(args[1])
|
|
except ValueError as e:
|
|
self.add_system_message(str(e), ignore_debug=True)
|
|
return
|
|
|
|
if (address, port) not in self.neighbours:
|
|
self.add_system_message("This client is unknown. Please register it by running "
|
|
f"\"/connect {address} {port}\"", ignore_debug=True)
|
|
return
|
|
self.data_lock.acquire(timeout=1)
|
|
peers = [self.find_peer(address, port)]
|
|
self.data_lock.release()
|
|
else:
|
|
peers = list(self.find_peer_by_nickname(args[0]))
|
|
if args[0].isnumeric():
|
|
identifier = int(args[0])
|
|
peers.append(self.find_peer_by_id(identifier))
|
|
if not peers:
|
|
self.add_system_message("Unknown client.")
|
|
return
|
|
|
|
for peer in peers:
|
|
self.add_system_message(f"**Identifier:** {peer.id or '<*unknown*>'}",
|
|
italic=False, ignore_debug=True)
|
|
self.add_system_message(f"**Nickname:** {peer.nickname or '<*unknown*>'}",
|
|
italic=False, ignore_debug=True)
|
|
self.add_system_message(f"**Addresses:** "
|
|
+ ", ".join(f"{address}:{port}" for address, port in peer.addresses),
|
|
italic=False, ignore_debug=True)
|
|
elif command == "active":
|
|
if not self.active_peers:
|
|
self.add_system_message("No active neighbour.", italic=False, ignore_debug=True)
|
|
return
|
|
|
|
for peer in self.active_peers:
|
|
self.add_system_message(f"**Identifier:** {peer.id or '<*unknown*>'}",
|
|
italic=False, ignore_debug=True)
|
|
self.add_system_message(f"**Nickname:** {peer.nickname or '<*unknown*>'}",
|
|
italic=False, ignore_debug=True)
|
|
self.add_system_message(f"**Addresses:** "
|
|
+ ", ".join(f"{address}:{port}" for address, port in peer.addresses),
|
|
italic=False, ignore_debug=True)
|
|
elif command == "potential":
|
|
if not self.potential_peers:
|
|
self.add_system_message("No potential neighbour.", italic=False, ignore_debug=True)
|
|
return
|
|
|
|
for peer in self.potential_peers:
|
|
self.add_system_message(f"**Identifier:** {peer.id or '<*unknown*>'}",
|
|
italic=False, ignore_debug=True)
|
|
self.add_system_message(f"**Nickname:** {peer.nickname or '<*unknown*>'}",
|
|
italic=False, ignore_debug=True)
|
|
self.add_system_message(f"**Addresses:** "
|
|
+ ", ".join(f"{address}:{port}" for address, port in peer.addresses),
|
|
italic=False, ignore_debug=True)
|
|
elif command == "debug":
|
|
self.squinnondation.debug ^= True
|
|
self.add_system_message(
|
|
"Debug mode " + ("enabled" if self.squinnondation.debug else "disabled") + ".", ignore_debug=True)
|
|
elif command == "emojis":
|
|
self.squinnondation.no_emoji ^= True
|
|
self.add_system_message(
|
|
"Emojis support " + ("disabled" if self.squinnondation.no_emoji else "enabled") + ".",
|
|
ignore_debug=True)
|
|
elif command == "markdown":
|
|
self.squinnondation.debug ^= True
|
|
self.add_system_message(
|
|
"Markdown support " + ("disabled" if self.squinnondation.no_markdown else "enabled") + ".",
|
|
ignore_debug=True)
|
|
else:
|
|
self.add_system_message("Unknown command. Please do /help to see available commands.", ignore_debug=True)
|
|
|
|
def add_message(self, msg: str) -> None:
|
|
"""
|
|
Store a new message into the history.
|
|
"""
|
|
self.history.append(msg)
|
|
if self.last_line == len(self.history) - 2:
|
|
self.last_line += 1
|
|
|
|
def receive_message_from(self, tlv: DataTLV, msg: str, sender_id: int, nonce: int, relay: Peer) -> bool:
|
|
"""
|
|
This method is called by a DataTLV, sent by a real person.
|
|
This add the message in the history if not already done.
|
|
Returns True iff the message was not already received previously.
|
|
"""
|
|
|
|
self.data_lock.acquire(timeout=1)
|
|
if (sender_id, nonce) not in self.received_messages:
|
|
# If it is a new message, add it to recent_messages
|
|
d = self.make_inundation_dict()
|
|
pkt = Packet().construct(tlv)
|
|
self.recent_messages[(sender_id, nonce)] = [pkt, time.time(), d]
|
|
self.data_lock.release()
|
|
|
|
# in all cases, remove the sender from the list of neighbours to be inundated
|
|
self.remove_from_inundation(relay, sender_id, nonce)
|
|
|
|
if (sender_id, nonce) in self.received_messages:
|
|
return False
|
|
|
|
self.data_lock.acquire(timeout=1)
|
|
self.add_message(msg) # for display purposes
|
|
self.received_messages[(sender_id, nonce)] = Message(msg, sender_id, nonce)
|
|
self.data_lock.release()
|
|
|
|
return True
|
|
|
|
def make_inundation_dict(self) -> dict:
|
|
"""
|
|
Takes the active peers dictionnary and returns a list of [peer, date+random, 0]
|
|
"""
|
|
res = dict()
|
|
peers = self.active_peers
|
|
for peer in peers:
|
|
if peer.symmetric:
|
|
next_send = uniform(1, 2)
|
|
res[peer.main_address] = [peer, time.time() + next_send, 0]
|
|
return res
|
|
|
|
def remove_from_inundation(self, peer: Peer, sender_id: int, nonce: int) -> None:
|
|
"""
|
|
Remove the sender from the list of neighbours to be inundated
|
|
"""
|
|
self.data_lock.acquire(timeout=1)
|
|
if (sender_id, nonce) in self.recent_messages:
|
|
# If a peer is late in its acknowledgement, the absence of the previous if causes an error.
|
|
for addr in peer.addresses:
|
|
self.recent_messages[(sender_id, nonce)][2].pop(addr, None)
|
|
|
|
if not self.recent_messages[(sender_id, nonce)][2]: # If dictionnary is empty, remove the message
|
|
self.recent_messages.pop((sender_id, nonce), None)
|
|
self.data_lock.release()
|
|
|
|
def clean_inundation(self) -> None:
|
|
"""
|
|
Remove messages which are overdue (older than 2 minutes) from the inundation dictionnary.
|
|
"""
|
|
for key in self.recent_messages.copy():
|
|
if time.time() - self.recent_messages[key][1] > 120:
|
|
self.data_lock.acquire(timeout=1)
|
|
self.recent_messages.pop(key)
|
|
self.data_lock.release()
|
|
|
|
def main_inundation(self) -> None:
|
|
"""
|
|
The main inundation function.
|
|
"""
|
|
self.data_lock.acquire(timeout=1)
|
|
for key in self.recent_messages.copy():
|
|
k = list(self.recent_messages[key][2].keys())
|
|
for key2 in k:
|
|
if time.time() >= self.recent_messages[key][2][key2][1]:
|
|
self.add_system_message(f"inundating {self.recent_messages[key][2][key2][0].id} with message {key}")
|
|
|
|
# send the packet if it is overdue
|
|
self.send_packet(self.recent_messages[key][2][key2][0], self.recent_messages[key][0])
|
|
|
|
# change the time until the next send
|
|
a = self.recent_messages[key][2][key2][2]
|
|
self.recent_messages[key][2][key2][2] = a + 1
|
|
next_send = uniform(2 ** (a - 1), 2 ** a)
|
|
self.recent_messages[key][2][key2][1] = time.time() + next_send
|
|
|
|
if self.recent_messages[key][2][key2][2] >= 5: # the neighbour is not reactive enough
|
|
gatlv = GoAwayTLV().construct(GoAwayType.TIMEOUT, f"{self.id} No acknowledge")
|
|
pkt = Packet().construct(gatlv)
|
|
peer = self.recent_messages[key][2][key2][0]
|
|
self.send_packet(peer, pkt)
|
|
self.recent_messages[key][2].pop(key2)
|
|
self.data_lock.release()
|
|
|
|
def add_system_message(self, msg: str, italic: bool = True, ignore_debug: bool = False) -> None:
|
|
"""
|
|
Add a new system log message.
|
|
"""
|
|
if self.squinnondation.debug or ignore_debug:
|
|
return self.add_message(
|
|
f"system: *{msg}*" if not self.squinnondation.no_markdown and italic else f"system: {msg}")
|
|
|
|
def print_markdown(self, pad: Any, y: int, x: int, msg: str,
|
|
bold: bool = False, italic: bool = False, underline: bool = False, strike: bool = False) -> int:
|
|
"""
|
|
Parse a markdown-formatted text and format the text as bold, italic or text text.
|
|
***text***: bold, italic
|
|
**text**: bold
|
|
*text*: italic
|
|
__text__: underline
|
|
_text_: italic
|
|
~~text~~: strikethrough
|
|
"""
|
|
msg = msg.replace("\0", "")
|
|
|
|
# Replace :emoji_name: by the good emoji
|
|
if not self.squinnondation.no_emoji:
|
|
import emoji
|
|
msg = emoji.emojize(msg, use_aliases=True)
|
|
|
|
if self.squinnondation.no_markdown:
|
|
try:
|
|
pad.addstr(y, x, msg)
|
|
except curses.error:
|
|
# Should not happen
|
|
pass
|
|
return len(msg)
|
|
|
|
underline_match = re.match("(.*)__(.*)__(.*)", msg)
|
|
if underline_match:
|
|
before, text, after = underline_match.group(1), underline_match.group(2), underline_match.group(3)
|
|
len_before = self.print_markdown(pad, y, x, before, bold, italic, underline)
|
|
len_mid = self.print_markdown(pad, y, x + len_before, text, bold, italic, not underline)
|
|
len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline)
|
|
return len_before + len_mid + len_after
|
|
|
|
italic_match = re.match("(.*)_(.*)_(.*)", msg)
|
|
if italic_match:
|
|
before, text, after = italic_match.group(1), italic_match.group(2), italic_match.group(3)
|
|
len_before = self.print_markdown(pad, y, x, before, bold, italic, underline)
|
|
len_mid = self.print_markdown(pad, y, x + len_before, text, bold, not italic, underline)
|
|
len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline)
|
|
return len_before + len_mid + len_after
|
|
|
|
bold_italic_match = re.match("(.*)\\*\\*\\*(.*)\\*\\*\\*(.*)", msg)
|
|
if bold_italic_match:
|
|
before, text, after = bold_italic_match.group(1), bold_italic_match.group(2),\
|
|
bold_italic_match.group(3)
|
|
len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
|
|
len_mid = self.print_markdown(pad, y, x + len_before, text, not bold, not italic, underline, strike)
|
|
len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
|
|
return len_before + len_mid + len_after
|
|
|
|
bold_match = re.match("(.*)\\*\\*(.*)\\*\\*(.*)", msg)
|
|
if bold_match:
|
|
before, text, after = bold_match.group(1), bold_match.group(2), bold_match.group(3)
|
|
len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
|
|
len_mid = self.print_markdown(pad, y, x + len_before, text, not bold, italic, underline, strike)
|
|
len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
|
|
return len_before + len_mid + len_after
|
|
|
|
italic_match = re.match("(.*)\\*(.*)\\*(.*)", msg)
|
|
if italic_match:
|
|
before, text, after = italic_match.group(1), italic_match.group(2), italic_match.group(3)
|
|
len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
|
|
len_mid = self.print_markdown(pad, y, x + len_before, text, bold, not italic, underline, strike)
|
|
len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
|
|
return len_before + len_mid + len_after
|
|
|
|
strike_match = re.match("(.*)~~(.*)~~(.*)", msg)
|
|
if strike_match:
|
|
before, text, after = strike_match.group(1), strike_match.group(2), strike_match.group(3)
|
|
len_before = self.print_markdown(pad, y, x, before, bold, italic, underline, strike)
|
|
len_mid = self.print_markdown(pad, y, x + len_before, text, bold, italic, underline, not strike)
|
|
len_after = self.print_markdown(pad, y, x + len_before + len_mid, after, bold, italic, underline, strike)
|
|
return len_before + len_mid + len_after
|
|
|
|
size = len(msg)
|
|
|
|
attrs = 0
|
|
attrs |= curses.A_BOLD if bold else 0
|
|
attrs |= curses.A_ITALIC if italic else 0
|
|
attrs |= curses.A_UNDERLINE if underline else 0
|
|
if strike:
|
|
msg = "".join(c + "\u0336" for c in msg)
|
|
|
|
remaining_lines = curses.LINES - 3 - (y + x // (curses.COLS - 1)) + 1
|
|
if remaining_lines > 0:
|
|
# Don't print the end of the line if it is too long
|
|
space_left_on_line = (curses.COLS - 2) - (x % (curses.COLS - 1))
|
|
msg = msg[:space_left_on_line + max(0, (curses.COLS - 1) * (remaining_lines - 1))]
|
|
if msg:
|
|
try:
|
|
pad.addstr(y + x // (curses.COLS - 1), x % (curses.COLS - 1), msg, attrs)
|
|
except curses.error:
|
|
# Should not happen
|
|
pass
|
|
return size
|
|
|
|
def refresh_history(self) -> None:
|
|
"""
|
|
Rewrite the history of the messages.
|
|
"""
|
|
self.refresh_lock.acquire(timeout=1)
|
|
|
|
y, x = self.squinnondation.screen.getmaxyx()
|
|
if curses.is_term_resized(curses.LINES, curses.COLS):
|
|
curses.resizeterm(y, x)
|
|
self.history_pad.resize(curses.LINES - 2, curses.COLS - 1)
|
|
self.input_pad.resize(1, curses.COLS - 1)
|
|
|
|
self.history_pad.erase()
|
|
|
|
y_offset = 0
|
|
for i, msg in enumerate(self.history[max(0, self.last_line - curses.LINES + 3):self.last_line + 1]):
|
|
if i + y_offset > curses.LINES - 3:
|
|
break
|
|
|
|
msg = re.sub("([^:]*): (.*)", "<\\1> \\2", msg, 1)
|
|
|
|
if not re.match("<.*> .*", msg):
|
|
msg = "<unknown> " + msg
|
|
match = re.match("<(.*)> (.*)", msg)
|
|
nickname = match.group(1)
|
|
msg = match.group(2)
|
|
full_msg = f"<{nickname}> {msg}"
|
|
color_id = sum(ord(c) for c in nickname) % 6 + 1
|
|
true_width = self.print_markdown(self.history_pad, i + y_offset, 0, full_msg)
|
|
self.history_pad.addstr(i + y_offset, 1, nickname, curses.A_BOLD | curses.color_pair(color_id + 1))
|
|
y_offset += true_width // (curses.COLS - 1)
|
|
self.history_pad.refresh(0, 0, 0, 0, curses.LINES - 2, curses.COLS)
|
|
|
|
self.refresh_lock.release()
|
|
|
|
def refresh_input(self) -> None:
|
|
"""
|
|
Redraw input line. Must not be called while the message is not sent.
|
|
"""
|
|
self.refresh_lock.acquire(timeout=1)
|
|
|
|
self.input_pad.erase()
|
|
color_id = sum(ord(c) for c in self.nickname) % 6 + 1
|
|
self.input_pad.addstr(0, 0, "<")
|
|
self.input_pad.addstr(0, 1, self.nickname, curses.A_BOLD | curses.color_pair(color_id + 1))
|
|
self.input_pad.addstr(0, 1 + len(self.nickname), "> ")
|
|
msg = self.input_buffer
|
|
if self.input_index >= curses.COLS - len(self.nickname) - 7:
|
|
msg = msg[self.input_index - (curses.COLS - len(self.nickname) - 7):self.input_index]
|
|
msg = msg[:curses.COLS - len(self.nickname) - 7]
|
|
self.input_pad.addstr(0, 3 + len(self.nickname), msg)
|
|
if not self.squinnondation.no_emoji:
|
|
self.input_pad.addstr(0, self.input_pad.getmaxyx()[1] - 3, "😀")
|
|
self.input_pad.refresh(0, 0, curses.LINES - 1, 0, curses.LINES - 1, curses.COLS - 1)
|
|
|
|
self.refresh_lock.release()
|
|
|
|
def refresh_emoji_pad(self) -> None:
|
|
"""
|
|
Display the emoji pad if necessary.
|
|
"""
|
|
if self.squinnondation.no_emoji:
|
|
return
|
|
|
|
from emoji import unicode_codes
|
|
|
|
self.refresh_lock.acquire(timeout=1)
|
|
|
|
self.emoji_pad.erase()
|
|
|
|
if self.emoji_panel_page > 0:
|
|
height, width = curses.LINES // 2, curses.COLS // 3
|
|
self.emoji_pad.resize(height + 1, width + 1)
|
|
self.emoji_pad.addstr(0, 0, "┏" + (width - 2) * "━" + "┓")
|
|
self.emoji_pad.addstr(0, (width - 14) // 2, " == EMOJIS == ")
|
|
for i in range(1, height):
|
|
self.emoji_pad.addstr(i, 0, "┃" + (width - 2) * " " + "┃")
|
|
self.emoji_pad.addstr(height - 1, 0, "┗" + (width - 2) * "━" + "┛")
|
|
|
|
emojis = list(unicode_codes.UNICODE_EMOJI)
|
|
emojis = [c for c in emojis if len(c) == 1]
|
|
size = (height - 2) * (width - 4) // 2
|
|
page = emojis[(self.emoji_panel_page - 1) * size:self.emoji_panel_page * size]
|
|
|
|
if self.emoji_panel_page != 1:
|
|
self.emoji_pad.addstr(1, width - 2, "⬆")
|
|
if len(page) == size:
|
|
self.emoji_pad.addstr(height - 2, width - 2, "⬇")
|
|
|
|
for i in range(height - 2):
|
|
for j in range((width - 4) // 2 + 1):
|
|
index = i * (width - 4) // 2 + j
|
|
if index < len(page):
|
|
self.emoji_pad.addstr(i + 1, 2 * j + 1, page[index])
|
|
|
|
self.emoji_pad.refresh(0, 0, curses.LINES - height - 2, curses.COLS - width - 2,
|
|
curses.LINES - 2, curses.COLS - 2)
|
|
|
|
self.refresh_lock.release()
|
|
|
|
def potential_to_contact(self) -> list:
|
|
"""
|
|
Returns a list of peers the user should contact if it does
|
|
not have enough symmetric neighbours.
|
|
"""
|
|
res = []
|
|
val = list(self.potential_peers)
|
|
lp = len(val)
|
|
|
|
for i in range(min(lp, max(0, self.minNS - self.nbNS))):
|
|
a = randint(0, lp - 1)
|
|
res.append(val[a])
|
|
return res
|
|
|
|
def send_hello(self) -> None:
|
|
"""
|
|
Sends a long HelloTLV to all active neighbours.
|
|
"""
|
|
for peer in self.active_peers:
|
|
htlv = HelloTLV().construct(16, self, peer)
|
|
pkt = Packet().construct(htlv)
|
|
self.send_packet(peer, pkt)
|
|
|
|
def verify_activity(self) -> None:
|
|
"""
|
|
All neighbours that have not sent a HelloTLV in the last 2
|
|
minutes are considered not active.
|
|
"""
|
|
val = list(self.active_peers) # create a copy because the dict size will change
|
|
|
|
for peer in val:
|
|
if time.time() - peer.last_hello_time > 2 * 60:
|
|
gatlv = GoAwayTLV().construct(GoAwayType.TIMEOUT, "you did not talk to me")
|
|
pkt = Packet().construct(gatlv)
|
|
self.send_packet(peer, pkt)
|
|
peer.active = False
|
|
self.update_peer_table(peer)
|
|
|
|
def update_peer_table(self, peer: Peer) -> None:
|
|
"""
|
|
We insert the peer into our table of clients.
|
|
If there is a collision with the address / the ID, then we merge clients into a unique one.
|
|
"""
|
|
self.data_lock.acquire(timeout=1)
|
|
|
|
for addr in peer.addresses:
|
|
if addr in self.neighbours:
|
|
# Merge with the previous peer
|
|
old_peer = self.neighbours[addr]
|
|
if isinstance(old_peer, User):
|
|
peer, old_peer = old_peer, peer
|
|
peer.merge(old_peer)
|
|
self.neighbours[addr] = peer
|
|
|
|
for other_peer in list(self.neighbours.values()):
|
|
if other_peer.id == peer.id > 0 and other_peer != peer:
|
|
# The peer with the same id is known as a different address. We merge everything
|
|
if isinstance(other_peer, User):
|
|
peer, old_peer = other_peer, peer
|
|
peer.merge(other_peer)
|
|
for other_addr in peer.addresses:
|
|
self.neighbours[other_addr] = peer
|
|
|
|
self.data_lock.release()
|
|
|
|
def send_neighbours(self) -> None:
|
|
"""
|
|
Update the number of symmetric neighbours and
|
|
send all neighbours NeighbourTLV
|
|
"""
|
|
|
|
nb_ns = 0
|
|
# could send the same to all neighbour, but it means that neighbour
|
|
# A could receive a message with itself in it -> if the others do not pay attention, trouble
|
|
for peer in self.active_peers:
|
|
if time.time() - peer.last_long_hello_time <= 2 * 60:
|
|
nb_ns += 1
|
|
peer.symmetric = True
|
|
ntlv = NeighbourTLV().construct(*peer.main_address)
|
|
pkt = Packet().construct(ntlv)
|
|
for destination in self.active_peers:
|
|
if destination.id != peer.id:
|
|
self.send_packet(destination, pkt)
|
|
else:
|
|
peer.symmetric = False
|
|
self.nbNS = nb_ns
|
|
|
|
def leave(self) -> None:
|
|
"""
|
|
The program is exited. We send a GoAway to our neighbours, then close the program.
|
|
"""
|
|
# Last inundation
|
|
self.data_lock.release()
|
|
self.refresh_lock.release()
|
|
self.main_inundation()
|
|
self.clean_inundation()
|
|
|
|
# Broadcast a GoAway
|
|
gatlv = GoAwayTLV().construct(GoAwayType.EXIT, "I am leaving! Good bye!")
|
|
pkt = Packet.construct(gatlv)
|
|
for peer in self.active_peers:
|
|
self.send_packet(peer, pkt)
|
|
|
|
exit(0)
|
|
|
|
def send_hello_multicast(self) -> int:
|
|
"""
|
|
Send a short hello on the multicast group.
|
|
"""
|
|
htlv = HelloTLV().construct(8, self)
|
|
pkt = Packet().construct(htlv)
|
|
|
|
res = self.send_multicast(pkt.marshal())
|
|
return res
|
|
|
|
def send_multicast(self, data: bytes) -> int:
|
|
"""
|
|
Send a packet on the multicast.
|
|
"""
|
|
return self.multicast_socket.sendto(data, ("ff02::4242:4242", 1212))
|
|
|
|
def receive_hello_multicast(self) -> Tuple[Packet, Peer]:
|
|
"""
|
|
Receive a packet from the multicast and translate it into a Python object.
|
|
"""
|
|
data, addr = self.receive_multicast()
|
|
peer = self.find_peer(addr[0], addr[1])
|
|
try:
|
|
pkt = Packet.unmarshal(data)
|
|
except ValueError as error:
|
|
# The packet contains an error. We memorize it.
|
|
peer.errors += 1
|
|
self.add_system_message("An error occured on the multicast")
|
|
raise error
|
|
else:
|
|
return pkt, peer
|
|
|
|
def receive_multicast(self) -> Tuple[bytes, Any]:
|
|
"""
|
|
Receive a packet from the socket.
|
|
"""
|
|
return self.multicast_socket.recvfrom(1024)
|
|
|
|
|
|
class Listener(Thread):
|
|
"""
|
|
It is the peer listener.
|
|
It always waits for an incoming packet, then it treats it, and continues to wait.
|
|
It is in a dedicated thread.
|
|
"""
|
|
def __init__(self, user: User, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.user = user
|
|
|
|
def run(self) -> None:
|
|
while True:
|
|
try:
|
|
pkt, peer = self.user.receive_packet()
|
|
except ValueError as error:
|
|
self.user.add_system_message("An error occurred while receiving a packet: {}".format(error))
|
|
self.user.refresh_history()
|
|
self.user.refresh_input()
|
|
self.user.refresh_emoji_pad()
|
|
else:
|
|
if peer.banned:
|
|
# Ignore banned peers
|
|
continue
|
|
|
|
for tlv in pkt.body:
|
|
tlv.handle(self.user, peer)
|
|
self.user.refresh_history()
|
|
self.user.refresh_input()
|
|
self.user.refresh_emoji_pad()
|
|
|
|
|
|
class Multicastlistener(Thread):
|
|
"""
|
|
Used to listen on the multicast group to discover new people
|
|
"""
|
|
def __init__(self, user: User, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.user = user
|
|
|
|
def run(self) -> None:
|
|
self.user.add_system_message("running")
|
|
while True:
|
|
try:
|
|
pkt, peer = self.user.receive_hello_multicast()
|
|
except ValueError as error:
|
|
self.user.add_system_message("An error occurred while receiving a packet: {}".format(error))
|
|
self.user.refresh_history()
|
|
self.user.refresh_input()
|
|
self.user.refresh_emoji_pad()
|
|
else:
|
|
if peer.banned:
|
|
# Ignore banned peers
|
|
continue
|
|
|
|
for tlv in pkt.body:
|
|
# We are only supposed to receive HelloTlVs via this communication mean
|
|
self.user.add_system_message(f"Via multicast {peer.addresses}:")
|
|
tlv.handle(self.user, peer)
|
|
self.user.refresh_history()
|
|
self.user.refresh_input()
|
|
self.user.refresh_emoji_pad()
|
|
|
|
|
|
class PeerManager(Thread):
|
|
"""
|
|
A process to cleanly manage the user's neighbours
|
|
"""
|
|
def __init__(self, user: User, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.user = user
|
|
self.last_potential = 0
|
|
self.last_check = 0
|
|
self.last_neighbour = 0
|
|
self.last_multicast = 0
|
|
|
|
htlv = HelloTLV().construct(8, self.user)
|
|
pkt = Packet().construct(htlv)
|
|
self.hellopkt = pkt
|
|
|
|
def run(self) -> None:
|
|
while True:
|
|
# First part of neighbour management: ensure the user has enough
|
|
# symmetric neighbours.
|
|
if time.time() - self.last_potential > 30:
|
|
to_contact = self.user.potential_to_contact()
|
|
|
|
for peer in to_contact:
|
|
self.user.send_packet(peer, self.hellopkt)
|
|
self.last_potential = time.time()
|
|
|
|
# Second part: send long HelloTLVs to neighbours every 30 seconds
|
|
if time.time() - self.last_check > 30:
|
|
self.user.add_system_message(f"I have {len(self.user.active_peers)} friends")
|
|
self.user.send_hello()
|
|
self.last_check = time.time()
|
|
|
|
# Third part: get rid of inactive neighbours
|
|
self.user.verify_activity()
|
|
|
|
# Fourth part: verify symmetric neighbours and send NeighbourTLV every minute
|
|
if time.time() - self.last_neighbour > 60:
|
|
self.user.send_neighbours()
|
|
self.last_neighbour = time.time()
|
|
|
|
if self.user.squinnondation.multicast:
|
|
# For the multicast discovery : send a hello every minute.
|
|
if time.time() - self.last_multicast > 60:
|
|
self.user.send_hello_multicast()
|
|
self.last_multicast = time.time()
|
|
|
|
self.user.refresh_history()
|
|
self.user.refresh_input()
|
|
self.user.refresh_emoji_pad()
|
|
|
|
# Avoid infinite loops
|
|
time.sleep(1)
|
|
|
|
|
|
class Inondator(Thread):
|
|
"""
|
|
A process to manage the inondation
|
|
"""
|
|
def __init__(self, user: User, *args, **kwargs):
|
|
super().__init__(*args, **kwargs)
|
|
self.user = user
|
|
self.last_check = 0
|
|
|
|
def run(self) -> None:
|
|
while True:
|
|
try:
|
|
# clean the dictionnary
|
|
if time.time() - self.last_check > 30:
|
|
self.user.clean_inundation()
|
|
self.last_check = time.time()
|
|
|
|
# inundate
|
|
self.user.main_inundation()
|
|
|
|
self.user.refresh_history()
|
|
self.user.refresh_input()
|
|
self.user.refresh_emoji_pad()
|
|
except Exception as e:
|
|
self.user.add_system_message(f"An error occured while inondating: {e}", ignore_debug=True)
|
|
|
|
# Avoid infinite loops
|
|
time.sleep(1)
|
|
|
|
|
|
class Message:
|
|
"""
|
|
This class symbolises the data sent by a real client, excluding system messages.
|
|
This is useful to check unicity or to save and load messages.
|
|
"""
|
|
content: str
|
|
sender_id: int
|
|
nonce: int
|
|
created_at: datetime
|
|
|
|
def __init__(self, content: str, sender_id: int, nonce: int, created_at: datetime = None):
|
|
self.content = content
|
|
self.sender_id = sender_id
|
|
self.nonce = nonce
|
|
self.created_at = created_at or datetime.now()
|