C Program to Domain Name Service using UDP Protocol

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Aim:

  • To Domain Name Service (DNS) using UDP protocol.

Requirement:

  • PC with UNIX/ Linux Operating systems.
  • C compiler in Linux Environment

Algorithm:

  • Start the program
  • Include necessary header files such as sys/socket.h, sys/types.h, neinet/in.h
  • Create the variable for predefined structure hostent
  • Get the members of the structure as Name, Address, Address type, Alias and address list with the
  • help of the structure variable.
  • Print all the output
  • End the program.

Program:

#include <sys/types.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
int main()
{
struct hostent *h;
h=gethostbyname("www.amazon.com");
if(h==NULL)
{
herror("ERROR\n");
}
else
{
printf("\n Name :%s ",h->h_name);
printf("\n Address:%s ",inet_ntoa(*(struct in_addr*)h->h_addr));
printf("\n Addresstype is %d",h->h_addrtype);
printf("\n Alias:%s",h->h_aliases[0]);
printf("\n Address list:%s\n",inet_ntoa(*(struct in_addr *)h->h_addr_list[0]));
}
return 0;
}Code language: PHP (php)

Output:

Name :e15316.a.akamaiedge.net 
Address:23.11.225.174 
Addresstype is 2
Alias:www.amazon.com
Address list:23.11.225.174Code language: CSS (css)

Result:

The domain name service using UDP protocol was successfully verified.

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