Question

what will be the code in C programming for the client and server chat application for the below issue :-

• write the C Programming code that able client have a unique ID to be known by the server

Answer 1

program for server

file name as .........server.c

#include <stdio.h> // standard input and output library

#include <stdlib.h> // this includes functions regarding memory allocation

#include <string.h> // contains string functions

#include <errno.h> //It defines macros for reporting and retrieving error conditions through error codes

#include <time.h> //contains various functions for manipulating date and time

#include <unistd.h> //contains various constants

#include <sys/types.h> //contains a number of basic derived types that should be used whenever appropriate

#include <arpa/inet.h> // defines in_addr structure

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

#include <netinet/in.h> //contains constants and structures needed for internet domain addresses

int main()

{

    time_t clock;

char dataSending[1025]; // Actually this is called packet in Network Communication, which contain data and send through.

int clintListn = 0, clintConnt = 0;

struct sockaddr_in ipOfServer;

clintListn = socket(AF_INET, SOCK_STREAM, 0); // creating socket

memset(&ipOfServer, '0', sizeof(ipOfServer));

memset(dataSending, '0', sizeof(dataSending));

ipOfServer.sin_family = AF_INET;

ipOfServer.sin_addr.s_addr = htonl(INADDR_ANY);

ipOfServer.sin_port = htons(2017); // this is the port number of running server

bind(clintListn, (struct sockaddr*)&ipOfServer , sizeof(ipOfServer));

listen(clintListn , 20);

while(1)

{

printf("\n\nHi,Iam running server.Some Client hit me\n"); // whenever a request from client came. It will be processed here.

clintConnt = accept(clintListn, (struct sockaddr*)NULL, NULL);

clock = time(NULL);

snprintf(dataSending, sizeof(dataSending), "%.24s\r\n", ctime(&clock)); // Printing successful message

write(clintConnt, dataSending, strlen(dataSending));

        close(clintConnt);

        sleep(1);

     }

     return 0;

}

for client program

client.c as file name

#include <sys/socket.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <netdb.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <arpa/inet.h>

int main()

{

    int CreateSocket = 0,n = 0;

    char dataReceived[1024];

    struct sockaddr_in ipOfServer;

    memset(dataReceived, '0' ,sizeof(dataReceived));

    if((CreateSocket = socket(AF_INET, SOCK_STREAM, 0))< 0)

    {

        printf("Socket not created \n");

        return 1;

    }

    ipOfServer.sin_family = AF_INET;

    ipOfServer.sin_port = htons(2017);

    ipOfServer.sin_addr.s_addr = inet_addr("127.0.0.1");

    if(connect(CreateSocket, (struct sockaddr *)&ipOfServer, sizeof(ipOfServer))<0)

    {

        printf("Connection failed due to port and ip problems\n");

        return 1;

    }

    while((n = read(CreateSocket, dataReceived, sizeof(dataReceived)-1)) > 0)

    {

        dataReceived[n] = 0;

        if(fputs(dataReceived, stdout) == EOF)

        {

            printf("\nStandard output error");

        }

        printf("\n");

    }

    if( n < 0)

    {

        printf("Standard input error \n");

    }

    return 0;

}