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server.py
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server.py
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from utils import *
from time import sleep
from json import load
from random import randint
import threading
import socket
lock = threading.Lock()
def main():
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) as server:
try:
server.bind(('', 67))
except Exception as e:
print(e)
server.close()
exit()
server.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
configs = Configs()
# timer to expire ip assigned addresses
thread = threading.Thread(target=timer, args=(configs.assigned, configs.ip_pool))
thread.start()
# Sow all the assigned ip addresses with client details
thread1 = threading.Thread(target=show_assigned, args=(configs,))
thread1.start()
while True:
data = server.recv(1024)
# if data[242] == 1:
# port = addr[1]
thread = threading.Thread(target=handle, args=(data, server, configs))
thread.start()
sleep(2)
def show_assigned(configs):
while True:
sleep(1)
configs.show()
print()
def handle(data, server, configs):
srv_conf = DHCPServer(configs)
srv_conf.DHCPReceive(data)
if data[242] == 1:
if srv_conf.your_IP is None:
return
srv_conf.DHCPOffer()
server.sendto(srv_conf.packet, ('<broadcast>', 68))
sleep(1)
req_data = server.recv(1024)
srv_conf.DHCPReceive(req_data)
sleep(1)
if srv_conf.server_unMatch:
return
srv_conf.DHCPAck()
server.sendto(srv_conf.packet, ('<broadcast>', 68))
sleep(1)
class Configs:
def __init__(self):
self.pool_mode = ''
self.subnet_mask = '255.255.255.224'
self.ip_pool = []
self.lease_time = ''
self.reservation = dict()
self.black_list = list()
self.router = '192.168.1.0'
self.server_identifier = '192.168.1.1'
self.dns_list = ['1.1.1.1', '8.8.8.8']
self.assigned = dict()
self.load_conf()
for res in self.reservation:
ipData = IPData('res', self.reservation[res], 10 ** 20)
self.assigned[res] = ipData
def load_conf(self):
f = open('configs.json')
data = load(f)
self.pool_mode = data['pool_mode']
ip_pool = []
if self.pool_mode == 'range':
low = data['range']['from']
high = data['range']['to']
ip_pool = ips_range(low, high)
ip_pool.append(high)
elif self.pool_mode == 'subnet':
ip_block = data['subnet']['ip_block']
subnet_mask = data['subnet']['subnet_mask']
ip_pool = ips_subnet(ip_block, subnet_mask)
self.subnet_mask = subnet_mask
self.ip_pool = ip_pool
self.lease_time = str(data['lease_time'])
reservation = dict()
for mac in data['reservation_list']:
reservation[mac] = data['reservation_list'][mac]
if reservation[mac] in ip_pool:
ip_pool.remove(reservation[mac])
self.reservation = reservation
for mac in data['black_list']:
self.black_list.append(mac)
def show(self):
global lock
with lock:
print(self.ip_pool)
for mac in self.assigned:
print('hostname: {} | MAC: {} | IP: {} | EXP: {}'
.format(self.assigned[mac].host_name, mac_split(mac),
self.assigned[mac].ip, self.assigned[mac].expire_time))
class IPData:
def __init__(self, host_name, ip, expire_time):
self.host_name = host_name
self.ip = ip
self.expire_time = expire_time
def tick(self):
self.expire_time = self.expire_time - 1
class DHCPServer:
def __init__(self, configs):
# receive
self.transaction_ID = b''
self.client_mac = ''
self.host_name = ''
self.req = False
self.server_unMatch = False
# extract
self.subnet_mask = ip_to_hex(configs.subnet_mask)
self.IP_lease_time = configs.lease_time
self.router = ip_to_hex(configs.router)
self.Server_ID = ip_to_hex(configs.server_identifier)
self.dns_list = configs.dns_list
self.dns_addresses = b''
for dns in self.dns_list:
self.dns_addresses += ip_to_hex(dns)
self.lease_time = configs.lease_time
self.assigned = configs.assigned
self.ip_pool = configs.ip_pool
self.black_list = configs.black_list
# create
self.your_IP = None
self.packet = b''
def assign_ip(self):
if self.client_mac in self.black_list:
self.your_IP = None
return
if self.client_mac in self.assigned:
# renew
self.assigned[self.client_mac].expire_time = int(self.lease_time)
self.your_IP = self.assigned[self.client_mac].ip
return
if self.req:
ipData = IPData(self.host_name, self.your_IP, int(self.lease_time))
self.assigned[self.client_mac] = ipData
self.ip_pool.remove(self.your_IP)
else:
x = randint(0, len(self.ip_pool) - 1)
ip = self.ip_pool[x]
self.your_IP = ip
def DHCPReceive(self, data):
if data[242] == 1:
self.transaction_ID = data[4:8] # in byte form
self.client_mac = mac_to_str(data[28:34])
nameLen = data[257]
self.host_name = data[258:258 + nameLen].decode()
self.assign_ip()
elif data[242] == 3:
if self.Server_ID == data[259:263]:
# if self.transaction_ID == data[4:8]:
self.transaction_ID = data[4:8] # in byte form
self.req = True
self.client_mac = mac_to_str(data[28:34])
self.assign_ip()
else:
self.server_unMatch = True
def DHCPBody(self):
packet = b''
packet += b'\x02'
packet += b'\x01'
packet += b'\x06'
packet += b'\x00'
packet += self.transaction_ID
packet += b'\x00\x00'
packet += b'\x80\x00'
packet += b'\x00\x00\x00\x00'
packet += ip_to_hex(self.your_IP)
packet += b'\x00\x00\x00\x00'
packet += b'\x00\x00\x00\x00'
packet += mac_to_bytes(self.client_mac)
packet += b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
packet += b'\x00' * 64
packet += b'\x00' * 128
packet += b'\x63\x82\x53\x63'
return packet
def DHCPOffer(self):
packet = self.DHCPBody()
# options
packet += b'\x35\x01\x02'
packet += b'\x01\x04' + self.subnet_mask
packet += b'\x03\x04' + self.router
packet += b'\x06\x08' + self.dns_addresses
packet += b'\x33\x04' + lease_to_hex(self.IP_lease_time)
packet += b'\x36\x04' + self.Server_ID
packet += b'\xff'
self.packet = packet
def DHCPAck(self):
packet = self.DHCPBody()
# options
packet += b'\x35\x01\x05'
packet += b'\x01\x04' + self.subnet_mask
packet += b'\x03\x04' + self.router
packet += b'\x06\x04' + self.dns_addresses
packet += b'\x33\x04' + lease_to_hex(self.IP_lease_time)
packet += b'\x36\x04' + self.Server_ID
packet += b'\xff'
self.packet = packet
def timer(assigned_, ip_pool_):
global lock
while True:
sleep(1)
for mac in list(assigned_.keys()):
assigned_[mac].tick()
if assigned_[mac].expire_time == 0:
ip_pool_.append(assigned_[mac].ip)
with lock:
del assigned_[mac]
if __name__ == '__main__':
main()