Onionr/src/lan/discover.py

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"""Onionr - Private P2P Communication.
Discover and publish private-network
"""
import socket
import struct
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from typing import TYPE_CHECKING
from typing import List
from ipaddress import ip_address
from socket import SHUT_RDWR
from .getip import lan_ips
from utils.bettersleep import better_sleep
"""
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
MCAST_GRP = '224.13.3.7'
MCAST_PORT = 1337
IS_ALL_GROUPS = True
ANNOUNCE_LOOP_SLEEP = 30
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def learn_services(lan_service_list: List):
"""Take a list to infintely add lan service info to."""
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
if IS_ALL_GROUPS:
# on this port, receives ALL multicast groups
sock.bind(('', MCAST_PORT))
else:
# on this port, listen ONLY to MCAST_GRP
sock.bind((MCAST_GRP, MCAST_PORT))
mreq = struct.pack("4sl", socket.inet_aton(MCAST_GRP), socket.INADDR_ANY)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
while True:
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service_ips = sock.recv(200).decode('utf-8')
if 'onionr' not in service_ips:
continue
service_ips = service_ips.replace('onionr-', '').split('-')
port = 0
for service in service_ips:
try:
ip_address(service)
except ValueError:
service_ips.remove(service)
continue
# remove our own ips
service_ips = set(lan_ips) ^ set(service_ips)
# remove known ips and add to external list
lan_service_list = set(service_ips) ^ set(lan_service_list)
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sock.shutdown(SHUT_RDWR)
sock.close()
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# no return intended, list modified by reference
def advertise_service():
# regarding socket.IP_MULTICAST_TTL
# ---------------------------------
# for all packets sent, after three hops on the network the packet will not
# be re-sent/broadcast (see https://www.tldp.org/HOWTO/Multicast-HOWTO-6.html)
MULTICAST_TTL = 3
ips = '-'.join(lan_ips)
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, MULTICAST_TTL)
while True:
sock.sendto(f"onionr-{ips}".encode('utf-8'), (MCAST_GRP, MCAST_PORT))
better_sleep(ANNOUNCE_LOOP_SLEEP)
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sock.shutdown(SHUT_RDWR)
sock.close()