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receiver.py
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receiver.py
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import time
from socket import socket, AF_INET, SOCK_DGRAM
#import random
import sys
import os
import pickle
class PackageSTP:
def __init__(self, sequence, acknowledge, syn, ack, fin, data):
self.sequence = sequence
self.acknowledge = acknowledge
self.syn = syn
self.ack = ack
self.fin = fin
self.data = data
class checksumpacket:
def __init__(self, STP):
self.sequence = STP.sequence
self.acknowledge = STP.acknowledge
self.syn = STP.syn
self.ack = STP.ack
self.fin = STP.fin
self.data = STP.data
class receiver:
def __init__(self, receiver_port, filename):
self.receiver_port = int(receiver_port)
self.filename = filename
self.beginTime = None
self.Totalsegments=0
def flagNUM(self,S,A,F):
self.Flag=''
if S==True:
self.Flag+='S'
if A==True:
self.Flag+='A'
if F==True:
self.Flag+='F'
if S!=True and A!=True and F!= True:
self.Flag='D'
def handshake(self):
STPpacket = self.receivepacket()
if STPpacket.syn == True:
self.sendpacket(0, STPpacket.sequence+1, True, True, False, '')
STPpacket = self.receivepacket()
if STPpacket.acknowledge == 1 and STPpacket.syn == False and STPpacket.ack == True and STPpacket.fin == False and STPpacket.data == '':
self.dataStartSeq = 2
return self.beginTime,STPpacket.acknowledge,self.Totalsegments
def sendpacket(self,sequence, acknowledge, syn, ack, fin, data):
self.flagNUM(syn,ack,fin)
STPpacket = pickle.dumps(PackageSTP(sequence, acknowledge, syn, ack, fin, data))
socket.sendto(STPpacket, self.sender_addr)
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('snd',(time.time()-self.beginTime),self.Flag,sequence,len(data),acknowledge))
def receivepacket(self):
STPpacket, addr = socket.recvfrom(2048)
if self.beginTime == None:
self.beginTime = time.time()
self.Totalsegments+=1
self.sender_addr = addr
STPpacket = pickle.loads(STPpacket)
self.flagNUM(STPpacket.syn,STPpacket.ack,STPpacket.fin)
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('rcv',(time.time()-self.beginTime),self.Flag,STPpacket.sequence,len(STPpacket.data),STPpacket.acknowledge))
return STPpacket
class ReceiveData:
def __init__(self,receiver_port, filename,beginTime,startwaiting):
self.receiver_port = int(receiver_port)
self.filename = filename
self.beginTime = beginTime
self.waiting=startwaiting##from handshake
self.Totalsegments=0
self.datatotal=0
self.errortotal=0
self.Dupdata=0
self.DupACK=0
def flagNUM(self,S,A,F):
self.Flag=''
if S==True:
self.Flag+='S'
if A==True:
self.Flag+='A'
if F==True:
self.Flag+='F'
if S!=True and A!=True and F!= True:
self.Flag='D'
def checksum(self,source_bin):
sum = 0
max_count = (len(source_bin)//2) * 2
counter = 0
while counter < max_count:
val = source_bin[counter + 1] * 256 + source_bin[counter]
sum = sum + val
sum = sum & 0xffffffff
counter = counter + 2
if max_count < len(source_bin):
sum = sum + source_bin[len(source_bin) - 1]
sum = (sum >> 16) + (sum & 0xffff)
sum = sum + (sum >> 16)
checksum = ~sum
checksum = checksum & 0xffff
return checksum
def Send(self,sequence,acknowledge,syn,ack,fin,data,s):
self.flagNUM(syn,ack,fin)
a='snd'+s
STPpacket = pickle.dumps(PackageSTP(sequence, acknowledge, syn, ack, fin, data))
socket.sendto(STPpacket, self.sender_addr)
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format(a,(time.time()-self.beginTime),self.Flag,sequence,len(data),acknowledge))
def Transport(self):
self.nextSeq=0
self.ACKed=[]
self.drop=[]
self.buffer={}
self.data={}
self.key=[]
self.alreadysend=[]
# if self.waiting==1:
while True:
STPpacket, addr = socket.recvfrom(2048)
self.Totalsegments+=1
# checksum=sum(STPpacket)&0xffff
# print('checksum:',checksum)
self.sender_addr = addr
STPpacket = pickle.loads(STPpacket)
# tempPacket= pickle.dumps(checksumpacket(STPpacket))
checksum=self.checksum(STPpacket.data)
print('checksum:',checksum,STPpacket.checksum)
print('waiting: ',self.waiting,'Rec:',STPpacket.sequence)
self.flagNUM(STPpacket.syn,STPpacket.ack,STPpacket.fin)
# ending
if STPpacket.fin==True:
with open(self.filename, 'wb') as file:
print(sorted(set(self.key)))
self.lengthdata=0
for m in sorted(set(self.key)):
self.lengthdata+=len(self.data[m])
file.write(self.data[m])
if self.FIN(STPpacket):
L=[self.lengthdata,self.Totalsegments,self.datatotal,self.errortotal,self.Dupdata,self.DupACK]
return L
self.datatotal+=1
if STPpacket.sequence in self.buffer or STPpacket.sequence in self.data:
self.Dupdata+=1
if self.waiting not in self.alreadysend:
self.alreadysend.append(self.waiting)
self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','')
else:
self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','/DA')
self.DupACK+=1
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('rcv/DA',(time.time()-self.beginTime),'D',STPpacket.sequence,len(STPpacket.data),STPpacket.acknowledge))
if STPpacket.checksum!=checksum:
self.errortotal+=1
print('no data')
# if self.waiting not in self.alreadysend:
# self.alreadysend.append(self.waiting)
# self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','')
# else:
# self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','/DA')
# self.DupACK+=1
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('rcv/corr',(time.time()-self.beginTime),'D',STPpacket.sequence,len(STPpacket.data),STPpacket.acknowledge))
elif STPpacket.sequence==self.waiting:
print('yes')
# if STPpacket.sequence not in self.ACKed:
# self.ACKed.append(STPpacket.sequence)
self.key.append(STPpacket.sequence)
self.data[STPpacket.sequence]=STPpacket.data
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('rcv',(time.time()-self.beginTime),'D',STPpacket.sequence,len(STPpacket.data),STPpacket.acknowledge))
b=STPpacket.sequence+len(STPpacket.data)
while b in self.buffer:
print('remove buffer:',b)
self.key.append(b)
self.data[b]=self.buffer[b]
length=len(self.buffer[b])
del self.buffer[b]
b+=length
self.waiting=b
if self.waiting not in self.alreadysend:
self.alreadysend.append(self.waiting)
self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','')
else:
self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','/DA')
self.DupACK+=1
elif STPpacket.sequence>self.waiting:
print('buffer')
self.buffer[STPpacket.sequence]=STPpacket.data
if self.waiting not in self.alreadysend:
self.alreadysend.append(self.waiting)
self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','')
else:
self.Send(STPpacket.acknowledge, self.waiting, False, True, False, '','/DA')
self.DupACK+=1
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('rcv',(time.time()-self.beginTime),'D',STPpacket.sequence,len(STPpacket.data),STPpacket.acknowledge))
def FIN(self,STPpacket):
self.flagNUM(STPpacket.syn,STPpacket.ack,STPpacket.fin)
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('rcv',(time.time()-self.beginTime),self.Flag,STPpacket.sequence,len(STPpacket.data),STPpacket.acknowledge))
self.Send(STPpacket.acknowledge, STPpacket.sequence+1, False, True, False, '','')
self.Send(STPpacket.acknowledge, STPpacket.sequence+1, False, False, True, '','')
STPpacket, addr = socket.recvfrom(2048)
self.Totalsegments+=1
self.sender_addr = addr
STPpacket = pickle.loads(STPpacket)
self.flagNUM(STPpacket.syn,STPpacket.ack,STPpacket.fin)
log.write('{:10s}{:10.2f} {:5s}{:12d}{:12d}{:12d}\n'.format('rcv',(time.time()-self.beginTime),self.Flag,STPpacket.sequence,len(STPpacket.data),STPpacket.acknowledge))
return True
def writelog():
socket.bind(('', int(receiver_port)))
global log
log = open('Receiver_log.txt', "w")
Receiver = receiver(receiver_port, filename)
beginTime,startwaiting,addnum=Receiver.handshake()
print("handshake done!")
Data=ReceiveData(receiver_port, filename ,beginTime,startwaiting)
L= Data.Transport()
L[1]+=addnum
log.write('===============================================================================\n')
log.write('{:50s}{:5d}\n'.format('Amount of Data Received (bytes)', L[0]))
log.write('{:50s}{:5d}\n'.format('Total segments received', L[1]))
log.write('{:50s}{:5d}\n'.format('Data segments received', L[2]))
log.write('{:50s}{:5d}\n'.format('Data Segments with bit errors', L[3]))
log.write('{:50s}{:5d}\n'.format('Duplicate data segments received',L[4]))
log.write('{:50s}{:5d}\n'.format('Duplicate Acks sent', L[5]))
log.write('===============================================================================\n')
log.close()
if len(sys.argv)!=3:
print('python3 receiver.py receiver_port filename')
receiver_port = sys.argv[1]
filename = sys.argv[2]
socket = socket(AF_INET, SOCK_DGRAM)
writelog()