/
server_abstr.py
79 lines (70 loc) · 3.1 KB
/
server_abstr.py
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import json
import socket
import random
from transport import Protocol
from diffie_hellman import DiffieHellman
class Server:
def __init__(self, PORT):
self.client_port, self.server_port = PORT
self.serv_secret = random.randint(500, 1500)
self.target_server_port = ''
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.proto_sock = Protocol(sock)
self.proto_sock.start(self.server_port)
self.hellman = DiffieHellman()
def handshake(self, data):
dat = json.loads(data)
if 'encry' not in dat.keys():
dat.update({'key': self.hellman.generate_key(self.serv_secret)})
dat1 = json.dumps(dat)
self.proto_sock.write(dat1, dat['addr'])
data = self.proto_sock.read()
data = json.loads(data)
self.top_secret_key = self.hellman.get_secret_key(data['key'], self.serv_secret)
def listening(self):
first = {"type": "SERVER", "addr" : self.server_port, "data": 'bib-bib-bib...'}
first = json.dumps(first)
self.proto_sock.write(first, self.client_port)
data = self.proto_sock.read()
self.handshake(data)
while True:
data = self.proto_sock.read()
dta, typ = self.check_header(data)
if typ == 'CLIENT':
self.waiting_for_conn()
else:
self.connected_state()
def waiting_for_conn(self):
print('waiting_for_conn')
self.proto_sock.write(self.make_header(self.encry('Enter number(target server port): ')), self.client_port)
while True:
data = self.proto_sock.read()
dte, typ = self.check_header(data)
dte = self.hellman.decry(dte, self.top_secret_key)
if dte.isdigit():
self.target_server_port += dte
self.proto_sock.write(self.make_header(self.encry('next digit')), self.client_port)
else:
self.proto_sock.write(self.make_header(self.encry('speak pls')), self.client_port)
self.connected_state()
def encry(self, data):
return self.hellman.encry(data, self.top_secret_key)
def connected_state(self):
print('connected_state')
self.proto_sock.write(self.make_header('connection successful'), int(self.target_server_port))
while True:
data = self.proto_sock.read()
dta, typ = self.check_header(data)
if typ == 'CLIENT':
data = self.hellman.decry(dta, self.top_secret_key)
self.proto_sock.write(self.make_header(data), int(self.target_server_port))
else:
self.proto_sock.write(self.make_header(self.encry(dta)), self.client_port)
def make_header(self, data):
fdata = {"type": "SERVER", "addr" : self.server_port, "data": data, "encry": "Diffie Hellman"}
return json.dumps(fdata)
def check_header(self, data):
fdata = json.loads(data)
if fdata['type'] == 'SERVER':
self.target_server_port = fdata['addr']
return fdata['data'], fdata['type']