Write a Multi-user chat server and client?

//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)
{

printf ("Enter message -without space- to send or 'QUIT' \n");
printf ("or 'SerEnd$$' to stop server: ");
//Read msg from user
scanf ("%s", msg);
//Send msg to server
sendtoDST (sender_EP, MC_socket, msg);
printf ("Message %s sent \n", msg);
stop = (strncmp (msg, "QUIT", 4) == 0);
if (stop == 0)
{
stop = (strncmp (msg, "SerEnd$$", 8) == 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);

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

}
}

First answer by ID1975788365. Last edit by ID1975788365. Question popularity: 1 [recommend question].