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Python socket : Error receive data
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Python socket : Error receive data
#1
I write a network application. The server has ability to find client base on given subnet. If the client receive authentication message from server, it will respond to server. Everything working good but server, it can't receiver from client.

Client :

def ListenServer():
    # Listen init signal from Server to send data

    HOST = ''                 # Symbolic name meaning all available interfaces
    PORT = 50007              # Arbitrary non-privileged port

    # UDP Socket
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.bind((HOST, PORT))
    data, addr = s.recvfrom(1024)
    if data == 'Authen':
        SocketConnect(addr[0])

def SocketConnect(HOST):
    # Connect to Server to send data
    print HOST
    PORT = 50008              # The same port as used by the server

    # Create Socket
    print "Create Socket"
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    except socket.error, e:
        print "Error creating socket: %s" %e
        sys.exit(1)

    # Connect
    print "Connect"
    try:
        s.connect((HOST, PORT))
    except socket.error, e:
        print "Connection error: %s" %e
        sys.exit(1)

    # Send Data
    print "Send Data"
    try:
        s.sendall('Hello, world')
    except socket.error, e:
        print "Error sending data: %s" % e
        sys.exit(1)


    # Close Socket
    s.close()
    print "Close Socket"

ListenServer()
Server :

from netaddr import IPAddress
import socket
import sys
import ipaddress
import time


def FindAgent():
    PORT = 50007          # Port use to find Agent

    #Find broadcast address

    """IPAddress("255.255.255.0").netmask_bits()        #Convert Subnet Mask to Prefix Length, Result is 24"""
    try :
        HOST = str(ipaddress.ip_network(u'192.168.10.0/24')[-1])
    except ValueError as e :
        """e = sys.exc_info()[0]  # Find Exception you need"""
        print e

    # UDP client
    MESSAGE = "Authen"
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    for x in range(0,2):
        sock.sendto(MESSAGE, (HOST, PORT))


def ListenClient():
    # Listen Client sent data
    HOST = socket.gethostbyname(socket.gethostname())
    PORT = 50008
    # TCP socket

    # Create Socket
    print "Create Socket"
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    except socket.error, e:
        print "Error creating socket: %s" %e
        sys.exit(1)

    # Bind
    print "Bind"
    try:
        s.bind((HOST, PORT))
    except socket.error, e:
        print "Error bind: %s" %e
        sys.exit(1)

    # Listen
    print "Listen"
    try:
        s.listen(10)
    except socket.error, e:
        print "Error listen: %s" %e
        sys.exit(1)

    # Accept data from client
    print "Accept data from client"
    try:
        conn, addr = s.accept()
        data = s.recv(1024)
    except socket.error, e:
        print "Error listen: %s" %e
        sys.exit(1)

    print data
    s.close()

FindAgent()
ListenClient()
Error on Server :

Create Socket
Bind
Listen
Accept data from client
Error listen: [Errno 10057] A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied
[Finished in 0.8s with exit code 1]
[shell_cmd: python -u "C:\Users\Win7_Lab\Desktop\Server.py"]
[dir: C:\Users\Win7_Lab\Desktop]
[path: C:\Python27\;C:\Python27\Scripts;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\]
Without the line data = s.recv(1024) on Server, it working fine. But with it, the error show up. Can anybody please tell me why it happen ?
Reply
#2
Hello,

To the line 61 of Server script, try to replace "data = s.recv(1024)" by "data = conn.recv(1024)"

Avorane
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