Write a UDP Server Python program to keep the track of external clients and store their IP address as well as Port number.

Python Program

UDP Server

   
 
/*;==========================================
; Title: Write a UDP Server Python program to keep the track of external clients and store their IP address as well as Port number.
; Author: codenaive Santosh Kumar  <[email protected]> <[email protected]>
; Date:   18 Dec 2021
;==========================================*/
import socket
MyLocalIP     = "127.0.0.1"  # Local IP
MyLocalPort   = 20001  # local Port
bSize  = 1024  # buffer size 

serverToClientMSG = "Hi, Thanks for joining Server";
bytesToClient = str.encode(serverToClientMSG)

IP_Address_caller=[];
Port_caller=[];
NotExist=True;
 
# First, Create datagram socket
UDP_Server_Socket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
# Bind to address and ip
UDP_Server_Socket.bind((MyLocalIP, MyLocalPort))
 # Listen for incoming datagram packet
print("UDP server start and listening for clients.")
while(True):
    print("Listening...............\n")
    AddressPairbytes = UDP_Server_Socket.recvfrom(bSize)
    msg = AddressPairbytes[0]
    address = AddressPairbytes[1]
    clientMessage = "Message from Client:{}".format(msg)
    clientIP  = "Client IP Address:{}".format(address)
    # checking the client is on same server or not.
    if MyLocalIP != address[0]:
        for j in range(len(IP_Address_caller)):
            if IP_Address_caller[j]==address[0]:
                NotExist=False;
            
    else:
        NotExist=False;
        print("Client from the same server.\n");
        
    # check wether the client exist in the same server or not, if it doesn't exist then store their IP address and Port in List of an array.
    if NotExist == True:
        IP_Address_caller.append(address[0]);
        Port_caller.append(address[1])
    else:
        NotExist=True;
        print("client IP address already existing.\n");
       
    # print IP address and Port of external Client.
    print("\nIP Address with Port e.g <sever_id> and <port_Number> : ");
    for i in range(len(IP_Address_caller)):
        print(IP_Address_caller[i],' ',Port_caller[i]);

    #reply to client
    UDP_Server_Socket.sendto(bytesToClient, address)
							
												

UDP Client

   
 
/*;==========================================
; Title: Write a UDP Server Python program to keep the track of external clients and store their IP address as well as Port number.
; Author: codenaive Santosh Kumar  <[email protected]> <[email protected]>
; Date:   18 Dec 2021
; Programming Language: Python
;==========================================*/							
import socket
MyLocalIP      = "127.0.0.1"
MyLocalPort   = 5000
msgFromClient       = "Sending (IP address and PORT)";
bytesToServer         = str.encode(msgFromClient)
server_Address_Port   = ("127.0.0.1", 20001)
bSize          = 1024


#Create UDP socket at client side

Client_UDPSocket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)
Client_UDPSocket.bind((MyLocalIP , MyLocalPort))
Client_UDPSocket.sendto(bytesToServer, server_Address_Port)
messageFromServer = Client_UDPSocket.recvfrom(bSize)
message = "Message from Server {}".format(messageFromServer[0])
print(message);
Client_UDPSocket.close();


							
							
							

Output

External Client IP Address and Port  as <sever_id> and <port_Number> :
127.0.0.7   5500
Listening...............


External Client IP Address and Port  as <sever_id> and <port_Number> :
127.0.0.7   5500
127.0.0.9   5500
Listening...............


External Client IP Address and Port  as <sever_id> and <port_Number> :
127.0.0.7   5500
127.0.0.9   5500
127.0.0.10   5000
Listening...............

Client from the same server.

client IP address already existing.


External Client IP Address and Port  as <sever_id> and <port_Number> :
127.0.0.7   5500
127.0.0.9   5500
127.0.0.10   5000
Listening...............