Socket : Server

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <unistd.h>

#include <arpa/inet.h>

#define MAX_BUFF 80

#define SA struct sockaddr

#define RESET(buff) \

for (int i = 0; i < MAX_BUFF; i++) \

buff[i] = '\0';

void error(const char *msg)

{

perror(msg);

exit(1);

}

void readIndefinitely(int connfd)

{

char buffer[MAX_BUFF];

int n;

// Indefinite loop for chat

while (1)

{

// Clear the buffer

RESET(buffer)

// Read the data from client in buffer

if (read(connfd, buffer, sizeof(buffer)) > 0)

{

printf("From Client : %s", buffer);

}

// Add a response to client and send it

n=0;

RESET(buffer)

printf("Enter server response : ");

while ((buffer[n++] = getchar()) != '\n');

write(connfd, buffer, sizeof(buffer));

// Add exit condition

if (strcmp("exit\n", buffer) == 0)

{

printf("Server Exit ...\n");

break;

}

}

}

int main(int argc, char const *argv[])

{

int MAX_CLIENT = 5;

int sockfd, newsockfd, i;

struct sockaddr_in serv_addr, cli_addr;

int clilen;

// Checking the provided port no

if (argc < 2)

error("Port No not provided");

serv_addr.sin_family = AF_INET;

serv_addr.sin_addr.s_addr = INADDR_ANY;

serv_addr.sin_port = htons(atoi(argv[1]));

// Socket

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

error("Error in Creating Socket");

else

printf("Socket created successfully ...\n");

// Binding

if (bind(sockfd, (SA *)&serv_addr, sizeof(serv_addr)) < 0)

error("Error in binding");

else

printf("Binding to Port : %s \n", argv[1]);

// Listen

if (listen(sockfd, MAX_CLIENT) != 0)

{

error("Error in Listening ...");

}

else

printf("Started listening MAX client : %d\n", MAX_CLIENT);

// Accept

clilen = sizeof(cli_addr);

newsockfd = accept(sockfd, (SA *)&cli_addr, (socklen_t *)&clilen);

if (newsockfd < 0)

error("Error in Accept");

else

printf("Accepted the client : %d\n",newsockfd);

//Start Chatting

readIndefinitely(newsockfd);

close(newsockfd);

return 0;

}