Write a Multi-user chat server and client?

Answer 1

//Get and display distributed message

#include <sys/types.h> // for type

#include <sys/socket.h> // for socket API

#include <netinet/in.h> // for address

#include <arpa/inet.h> // for sockaddr_in

#include <stdio.h> // for printf()

#include <stdlib.h> // for atoi()

#include <string.h> // for strlen()

#include <unistd.h> // for close()

////////////////////////////////////////////

char *multiHostAddress = "239.255.10.10";

void getEcho (int sock)

{

struct sockaddr_in read_EP;

int stop = -1;

char *msg;

printf ("Waiting for message... \n");

while (stop < 0)

{

msg = (char *)recvfromDST (&read_EP, sock);

if (msg != NULL)

printf ("%s==>%s\n",inet_ntoa(read_EP.sin_addr),msg);

else

stop = 0;

}

}

////////////////////////////////////////////

int main(int argc, char **argv)

{

int sockMulti;

int readPort;

struct sockaddr_in EP_multi;

struct ip_mreq request;

unsigned char TTL=3;

//-------------

int MC_socket;

struct sockaddr_in server_EP, sender_EP;

char msg [60];

char *readmsg;

int port;

int stop = 0;

//--------------

//--------------

if (argc != 4)

{

IO_error(1,"Need host, send port and receive port.(e.g localhost 9000 9001)");

}

//--------------

else

{

//-----------------------------

//Send msg to server

port = atoi (argv[2]);

printf ("TCP Client to send message to Server %s at Port %d \n", argv[1], port);

setHostByName (&server_EP, argv[1], port);

MC_socket= sockTCP_create();

sock_connect(MC_socket, &server_EP);

while (stop 0);

}

//Receive msg from server

readPort = atoi (argv[3]);

printf ("Multicasting receiver at ports %d \n", readPort);

//Initialisation

sockMulti = sockUDP_create();

sockUDP_reuse (sockMulti);

setHostByAddr (&EP_multi, "any", readPort);

sock_bind (sockMulti, readPort);

sockUDP_join (sockMulti, multiHostAddress,&request);

//Use service

getEcho (sockMulti);

//Finalisation

sockUDP_drop (sockMulti, request);

close(sockMulti);

//----------------------------------

}

sock_shutdown(MC_socket, 1);

readmsg = NULL;

while (readmsg != NULL)

readmsg = (char *)readMessage(MC_socket);

//-----------------------------------

}

}