lab6_question2_server.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
int main() {
    int server_socket;
    char buffer[256];
    char hello_msg[256];
    struct sockaddr_in server_address, client_address;
    // Creating a socket file descriptor
    if ( (server_socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) {
        printf("error: socket creation failed\n");
        return -1; }
    // Filling server information
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr=inet_addr("127.0.0.1");
    server_address.sin_port = htons(6000);
    // Bind the socket with the server address
    if ( bind(server_socket, (const struct sockaddr *)&server_address,
              sizeof(server_address)) < 0 )
    {
        printf("error: bind failed\n");
        return (-1);
    }
    int client_address_len = sizeof(client_address);
    int n;
    n = recvfrom(server_socket, (char *)buffer, 255, MSG_WAITALL, ( struct sockaddr
                                                                   *) &client_address, &client_address_len);
    buffer[n] = '\0';
    printf("A message from a client: %s\n" , buffer);
    int val1,val2;
    sscanf(buffer,"%d%d",&val1,&val2);
    val1=val1+val2;
    sprintf(hello_msg, "%d",val1);
    sendto(server_socket, (const char *)hello_msg, strlen(hello_msg),MSG_CONFIRM,
           (const struct sockaddr *) &client_address, client_address_len);
    printf("done.\n");
    return 0; 
    }