83 lines
2.8 KiB
Python
83 lines
2.8 KiB
Python
"""Onionr - Private P2P Communication.
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Discover and publish private-network
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"""
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import socket
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import struct
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from typing import TYPE_CHECKING
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from typing import List
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from ipaddress import ip_address
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from socket import SHUT_RDWR
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from .getip import lan_ips, best_ip
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from utils.bettersleep import better_sleep
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"""
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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MCAST_GRP = '224.0.0.112'
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MCAST_PORT = 1337
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IS_ALL_GROUPS = True
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ANNOUNCE_LOOP_SLEEP = 30
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def learn_services(lan_client):
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"""Take a list to infintely add lan service info to."""
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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if IS_ALL_GROUPS:
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# on this port, receives ALL multicast groups
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sock.bind(('', MCAST_PORT))
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else:
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# on this port, listen ONLY to MCAST_GRP
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sock.bind((MCAST_GRP, MCAST_PORT))
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mreq = struct.pack("4sl", socket.inet_aton(MCAST_GRP), socket.INADDR_ANY)
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sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
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while True:
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service_ips = sock.recv(200).decode('utf-8')
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if 'onionr' not in service_ips:
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continue
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service_ips = service_ips.replace('onionr-', '').split('-')
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port = 0
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for service in service_ips:
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try:
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ip_address(service)
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if not ip_address(service).is_private: raise ValueError
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if service in lan_ips: raise ValueError
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except ValueError:
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pass
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else:
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lan_client.connect_peer(service)
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def advertise_service(specific_ips=None):
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# regarding socket.IP_MULTICAST_TTL
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# ---------------------------------
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# for all packets sent, after three hops on the network the packet will not
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# be re-sent/broadcast (see https://www.tldp.org/HOWTO/Multicast-HOWTO-6.html)
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MULTICAST_TTL = 3
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ips = best_ip
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
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sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, MULTICAST_TTL)
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while True:
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sock.sendto(f"onionr-{ips}".encode('utf-8'), (MCAST_GRP, MCAST_PORT))
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better_sleep(ANNOUNCE_LOOP_SLEEP)
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