Checksum Server Program

#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>

#include "checksum.c"

#define RESET(buff) \

for (i = 0; i < 100; i++) \

buff[i] = '\0';

void error(const char *msg)

{

perror(msg);

exit(1);

}

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

{

int sockfd, newsockfd, i;

struct sockaddr_in serv_addr, cli_addr;

char buff[100], temp[100], data[100];

char res[100];

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 Socket");

//Binding

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

error("Error in binding");

//Listen

listen(sockfd, 5);

while (1)

{

clilen = sizeof(cli_addr);

newsockfd = accept(sockfd, (struct sockaddr *)&cli_addr, &clilen);

if (newsockfd < 0)

error("Error in Accept");

RESET(buff)

strcpy(buff, " Enter the 1st data : ");

send(newsockfd, buff, 100, 0);

RESET(data)

recv(newsockfd, data, 100, 0);

RESET(buff);

strcpy(buff, "Enter the 2nd data : ");

send(newsockfd, buff, 100, 0);

RESET(buff);

recv(newsockfd, buff, 100, 0);

printf("\n From Client : %s \n", data);

RESET(res)

add(data, buff, temp);

complement(temp, res);

send(newsockfd, res, 100, 0);

RESET(buff)

recv(newsockfd, buff, 100, 0);

printf("\n Message from Client : %s \n", buff);

close(newsockfd);

}

return 0;

}