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@maulvi maulvi/client.py
Last active Jun 20, 2018

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Socket chat room Caesar cipher
import socket
import select
import sys
import string
key = 'abcdefghijklmnopqrstuvwxyz'
def encrypt(n, plaintext):
"""Encrypt the string and return the ciphertext"""
result = ''
for l in plaintext.lower():
try:
i = (key.index(l) + n) % 26
result += key[i]
except ValueError:
result += l
return result.lower()
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if len(sys.argv) != 3:
print "script, IP address, port number"
exit()
IP_address = str(sys.argv[1])
Port = int(sys.argv[2])
server.connect((IP_address, Port))
while True:
sockets_list = [sys.stdin, server]
read_sockets,write_socket, error_socket = select.select(sockets_list, [], [])
for socks in read_sockets:
if socks == server:
message = socks.recv(2048)
print message
else:
offset = 4
text = message
encrypted = encrypt(offset, text)
message = sys.stdin.readline()
server.send(encrypted)
sys.stdout.write(encrypted)
sys.stdout.flush()
server.close()
import socket
import select
from thread import *
import sys
import string
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# check argument yang dimasukkan lengkap dan benar
if len(sys.argv) != 3:
print "Correct usage: script, IP address, port number"
exit()
# perintah bind alamat ip address
IP_address = str(sys.argv[1])
# perintah bind port number
Port = int(sys.argv[2])
server.bind((IP_address, Port))
server.listen(100)
list_of_clients = []
key = 'abcdefghijklmnopqrstuvwxyz'
def decrypt(n, ciphertext):
"""Decrypt string dan return dengan hasil plaintext"""
result = ''
for l in ciphertext:
try:
i = (key.index(l) - n) % 26
result += key[i]
except ValueError:
result += l
return result
def clientthread(conn, addr):
# sends a message to the client whose user object is conn
conn.send("Welcome to chatroom!")
while True:
try:
message = conn.recv(2048)
if message:
offset = 4
text = message
decrypted = decrypt(offset, text)
print "<" + addr[0] + "> " + decrypted
# Calls broadcast function to send message to all
message_to_send = "<" + addr[0] + "> " + decrypted
broadcast(message_to_send, conn)
else:
"""message may have no content if the connection
is broken, in this case we remove the connection"""
remove(conn)
except:
continue
"""broadcast pesan ke semua client"""
def broadcast(message, connection):
for clients in list_of_clients:
if clients!=connection:
try:
clients.send(message)
except:
clients.close()
# if the link is broken, we remove the client
remove(clients)
"""The following function simply removes the object
from the list that was created at the beginning of
the program"""
def remove(connection):
if connection in list_of_clients:
list_of_clients.remove(connection)
while True:
conn, addr = server.accept()
"""List client yang terhubung pada room agar tetap terhubung"""
list_of_clients.append(conn)
# prints the address of the user that just connected
print addr[0] + " connected"
# creates and individual thread for every user
# that connects
start_new_thread(clientthread,(conn,addr))
conn.close()
server.close()
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