Decentralized peer 2 peer file transfer - python-3.x

Question

I am trying to implement a peer to peer file transfer protocol and i came across this code but when I ported it to python 3.6 I got this error "type error a bytes-like object is required not 'str'". Please can somebody help me out i am new to this.
server.py
! /usr/bin/python3.6
import subprocess
import socket
import sys
import os
import hashlib
HOST = 'localhost'
PORT = 8000
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print('Server Created')
except OSError as e:
print('Failed to create socket. Error Code : ' + str(msg[0]) + ' Message ' + msg[1])
sys.exit()
try:
s.bind((HOST, PORT))
except OSError as e:
print('Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1])
sys.exit()
print('Socket bind complete')
s.listen(1)
print('Server now listening')
while (1):
conn, addr = s.accept()
print('Connected with ' + addr[0] + ':' + str(addr[1]))
reqCommand = conn.recv(1024)
print('Client> %s' %(reqCommand))
string = reqCommand.split(' ')
if (reqCommand == 'quit'):
break
elif (reqCommand == 'lls'):
toSend=""
path = os.getcwd()
dirs=os.listdir(path)
for f in dirs:
toSend=toSend+f+' '
conn.send(toSend)
#print path
elif (string[1]== 'shortlist'):
path = os.getcwd()
command = 'find '+path+ ' -type f -newermt '+string[2]+' '+string[3]+ ' ! -newermt '+string[4]+' '+string[5]
var = commands.getstatusoutput(command)
var1 = var[1]
var=var1.split('\n')
rslt = ""
for i in var:
comm = "ls -l "+i+" | awk '{print $9, $5, $6, $7, $8}'"
tup=commands.getstatusoutput(comm)
tup1=tup[1]
str=tup1.split(' ')
str1=str[0]
str2=str1.split('/')
rslt=rslt+str2[-1]+' '+str[1]+' '+str[2]+' '+str[3]+' '+str[4]+'\n'
conn.send(rslt)
elif (string[1]=='longlist'):
path = os.getcwd()
var= commands.getstatusoutput("ls -l "+path+" | awk '{print $9, $5, $6, $7, $8}'")
var1 = ""
var1= var1+''+var[1]
conn.send(var1)
elif (string[0] == 'FileHash'):
if(string[1]== 'verify'):
BLOCKSIZE = 65536
hasher = hashlib.sha1()
with open(string[2], 'rb') as afile:
buf = afile.read(BLOCKSIZE)
while len(buf) > 0:
hasher.update(buf)
buf = afile.read(BLOCKSIZE)
conn.send(hasher.hexdigest())
print('Hash Successful')
elif (string[1] == 'checkall'):
BLOCKSIZE = 65536
hasher = hashlib.sha1()
path = os.getcwd()
dirs=os.listdir(path)
for f in dirs:
conn.send(f)
with open(f, 'rb') as afile:
buf = afile.read(BLOCKSIZE)
while len(buf) > 0:
hasher.update(buf)
buf = afile.read(BLOCKSIZE)
conn.send(hasher.hexdigest())
print('Hash Successful')
else:
string = reqCommand.split(' ') #in case of 'put' and 'get' method
if(len(string) > 1):
reqFile = string[1]
if (string[0] == 'FileUpload'):
file_to_write = open(reqFile,'wb')
si = string[2:]
for p in si:
p = p + " "
print("User" + p)
file_to_write.write(p)
while True:
data = conn.recv(1024)
print("User" + data)
if not data:
break
file_to_write.write(data)
file_to_write.close()
print('Receive Successful')
elif (string[0] == 'FileDownload'):
with open(reqFile, 'rb') as file_to_send:
for data in file_to_send:
conn.sendall(data)
print('Send Successful')
conn.close()
s.close()
This is the error from the server.
Server Created
Socket bind complete
Server now listening
Connected with 127.0.0.1:37760
Client> b''
Traceback (most recent call last):
File "./server.py", line 36, in <module>
string = reqCommand.split(' ')
TypeError: a bytes-like object is required, not 'str'
This is the client side of my program but having the same problem.
client.py
#! /usr/bin/python3.6
import socket
import sys
import os
import hashlib
HOST = 'localhost' #server name goes in here
PORT = 8000
def put(commandName):
socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName)
string = commandName.split(' ', 1)
string = commandName.split(' ')
inputFile = string[1]
with open(inputFile, 'rb') as file_to_send:
for data in file_to_send:
socket1.sendall(data)
print("Client users " + data)
socket1.send(data)
print('Upload Successful')
socket1.close()
return
def get(commandName):
socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName(data. 'utf-8'))
string = commandName.split(' ')
inputFile = string[1]
with open(inputFile, 'wb') as file_to_write:
while True:
data = socket1.recv(1024)
if not data:
break
# print data
file_to_write.write(data)
file_to_write.close()
print('Download Successful')
socket1.close()
return
def FileHash(commandName):
string = commandName.split(' ')
if string[1] == 'verify':
verify(commandName)
elif string[1] == 'checkall':
checkall(commandName)
def verify(commandName):
socket1=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName)
hashValServer=socket1.recv(1024)
string = commandName.split(' ')
BLOCKSIZE = 65536
hasher = hashlib.sha1()
with open(string[2], 'rb') as afile:
buf = afile.read(BLOCKSIZE)
while len(buf) > 0:
hasher.update(buf)
buf = afile.read(BLOCKSIZE)
hashValClient = hasher.hexdigest()
print('hashValServer= %s', (hashValServer))
print('hashValClient= %s', (hashValClient))
if hashValClient == hashValServer:
print('No updates')
else:
print('Update Available')
socket1.close()
return
def checkall(commandName):
socket1=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName)
string = commandName.split(' ')
BLOCKSIZE = 65536
hasher = hashlib.sha1()
# f=socket1.recv(1024)
while True:
f=socket1.recv(1024)
with open(f, 'rb') as afile:
buf = afile.read(BLOCKSIZE)
while len(buf) > 0:
hasher.update(buf)
buf = afile.read(BLOCKSIZE)
hashValClient = hasher.hexdigest()
hashValServer=socket1.recv(1024)
print ('Filename = %s', f)
print('hashValServer= %s', (hashValServer))
print('hashValClient= %s', (hashValClient))
if hashValClient == hashValServer:
print('No updates')
else:
print('Update Available')
if not f:
break
socket1.close()
return
def quit():
socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName)
socket1.close()
return
def IndexGet(commandName):
socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
string = commandName.split(' ')
if string[1] == 'shortlist':
socket1.send(commandName)
strng=socket1.recv(1024)
strng=strng.split('\n')
for f in strng:
print(f)
elif (string[1]=='longlist'):
socket1.send(commandName)
path=socket1.recv(1024)
rslt=path.split('\n')
for f in rslt[1:]:
print(f)
socket1.close()
return
def serverList(commandName):
socket1=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
socket1.connect((HOST, PORT))
socket1.send(commandName)
fileStr=socket1.recv(1024)
fileList=fileStr.split(' ')
for f in fileList[:-1]:
print(f)
socket1.close()
return
msg = input('Enter your name: ')
while(1):
print("\n")
print("****************")
print('Instruction')
print('"FileUpload [filename]" to send the file the server ')
print('"FileDownload [filename]" to download the file from the server ')
print('"ls" to list all files in this directory')
print('"lls" to list all files in the server')
print('"IndexGet shortlist <starttimestamp> <endtimestamp>" to list the files modified in mentioned timestamp.')
print('"IndexGet longlist" similar to shortlist but with complete file listing')
print('"FileHash verify <filename>" checksum of the modification of the mentioned file.')
print('"quit" to exit')
print("\n")
sys.stdout.write ('%s> ' %msg)
inputCommand = sys.stdin.readline().strip()
if (inputCommand == 'quit'):
quit()
break
elif (inputCommand == 'ls'):
path = os.getcwd()
dirs = os.listdir(path)
for f in dirs:
print(f)
elif (inputCommand == 'lls'):
serverList('lls')
else:
string = inputCommand.split(' ', 1)
if string[0] == 'FileDownload':
get(inputCommand)
elif string[0] == 'FileUpload':
put(inputCommand)
elif string[0] =='IndexGet':
IndexGet(inputCommand)
elif string[0] == 'FileHash':
FileHash(inputCommand)
I expexted it to transfer the file without any error, Please i am new to this can anybody help me out.
This the error from the client
FileUpload closer.mp3
g> Traceback (most recent call last):
File "./client.py", line 193, in <module>
put(inputCommand)
File "./client.py", line 16, in put
socket1.send(commandName)
TypeError: a bytes-like object is required, not 'str'

Answer 1

You're trying to send a string even though a byte array is needed.
in 'socket1.send(commandName)' write socket1.send(commandName.encode('utf-8') instead
same thing serverside.
You should really rethink coding a cryptocurrency if you can't figure out the difference between bytes and strings. Start with an easier project.