122 lines
4.2 KiB
Python
122 lines
4.2 KiB
Python
"""
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Networking client to connect to a server and find server hosts
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"""
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import ipaddress
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import random
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import psutil
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import socket
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SERVER_PORT = 29987
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SERVER_BUFFER = 1024
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SCAN_TIMEOUT = 3
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class InterfaceInfo:
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"""
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Class used for storing interface information to make it easier to use
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"""
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def __init__(self, interface_name, network):
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self.interface_name = interface_name
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self.network = network
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def __str__(self):
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return 'Interface:{0}, Network:{1}'.format(self.interface_name, self.network)
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def __repr__(self):
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return '(Interface:{0}, Network:{1})'.format(self.interface_name, self.network)
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def request_server_info(server_ip, server_port):
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"""
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Request server info from a PyPong server given an IP and a port
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:param server_ip: Server IP to request info from
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:param server_port: Port to connect to server on
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:return: response given by server (or lack thereof)
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"""
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request = 'PYPONGREQ;SVRINFO'
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udp_client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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# Timeout is set to SCAN_TIMEOUT plus a random number between 0 and SCAN_TIMEOUT so that threads can
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# start asynchronously to avoid a lot of requests being sent to machines at once
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# Average time is SCAN_TIMEOUT*1.5
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udp_client_socket.settimeout(SCAN_TIMEOUT + (SCAN_TIMEOUT * random.random()))
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try:
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udp_client_socket.sendto(str.encode(request, 'UTF-8'), (server_ip, server_port))
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except OSError:
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pass
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try:
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server_response = udp_client_socket.recvfrom(SERVER_BUFFER)[0].decode('UTF-8')
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except TimeoutError:
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server_response = '{0};TIMEOUT'.format(server_ip)
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except UnicodeDecodeError:
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server_response = '{0};MANGLED_RESPONSE'.format(server_ip)
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udp_client_socket.close()
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return server_response
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def get_interface_info():
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"""
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Gets information using psutil about the current machine's interfaces and their networks. This only works for IPv4
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networks and will not return any data in regard to IPv6 links.
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:return: List of InterfaceInfo objects containing information about all interfaces on the current machine excluding
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the loopback interface (lo or 127.0.0.1)
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"""
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raw_interface_data = psutil.net_if_addrs()
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interface_data = []
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for interface in raw_interface_data:
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# Extract needed information from psutil and put it into a InterfaceInfo object
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address = (raw_interface_data.get(interface)[0]).address
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cidr_suffix = ipaddress.IPv4Network('{0}/{1}'.format(address, raw_interface_data.get(interface)[0].netmask),
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strict=False).prefixlen
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# Do not add the loopback interface or IPv6 interfaces
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if ':' not in address and address != '127.0.0.1':
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interface_data.append(InterfaceInfo(interface, '{0}/{1}'.format(address, cidr_suffix)))
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return interface_data
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def get_ips_from_network(network):
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"""
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Generate a list of IP addresses given an address in CIDR notation. This works from smallest to largest, meaning that
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it builds a list starting at <ADDRESS>/32 (aka just the current machine) decrementing the CIDR by 1 until the
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correct subnet is reached.
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:param network:
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:return:
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"""
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network_split = network.split('/')
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address = network_split[0]
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cidr = int(network_split[1])
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all_addresses = []
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test_cidr = 32 # Start with the machine itself
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while test_cidr >= cidr:
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# Generate all addresses inside the current subnet given by 'address/test_cidr'
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current_addresses = [str(ip) for ip in ipaddress.IPv4Network('{0}/{1}'.format(address, test_cidr),
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strict=False)]
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# Do not add the address again if it is already in the list of all addresses
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for test_address in current_addresses:
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if test_address not in all_addresses:
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all_addresses.append(test_address)
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test_cidr -= 1
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return all_addresses
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def check_ip(ip_address):
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"""
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Check a single IP address for a running game server
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:param ip_address: IP address to check
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:return: response of the server (or timeout if none)
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"""
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response = request_server_info(ip_address, SERVER_PORT)
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return response
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