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/**program description:
*
* this is a simple nslook up program.
* You simple enter the domain name
* and the program gives you the ip
* addresses associated with this
* domain name, e.g. insert google.com,
* you will get different set of IP
* addresses that represents google.com
* Works under Windows OS.
*
* Note: input is not validated, feel free
* to customize the code
*
* Author: X-Shab
*
*/
#include<iostream>
#include<string>
#include<sstream>
#include<Ws2tcpip.h> //used instead of "Winsock2.h"
using namespace std;
struct addrinfo hints;
struct addrinfo *target; //holds full address information about the target domain
void initiateWinsockFacility()
{
WORD wVersionRequested;
WSADATA wsaData;
int error;
wVersionRequested = MAKEWORD(2, 2);
error = WSAStartup(wVersionRequested, &wsaData);
if (error != 0)
{
cout<<"WSAStartup failed with error: "<<error<<endl;
system("pause");
exit(-1);
}
}
void getFullAddressInformation(const char *ipAddress)
{
//output is sent to &target
int status = getaddrinfo(ipAddress, NULL, &hints, &target);
if(status != 0)
{
cout<<"getaddrinfo() error: "<< gai_strerror(status) <<endl;
WSACleanup();
system("pause");
exit(-1);
}
}
string nslookup(struct addrinfo *fetchIPsFromTarget)
{
char printableIP[INET6_ADDRSTRLEN];
struct sockaddr_in *ipv4 = (struct sockaddr_in *)fetchIPsFromTarget->ai_addr;
void *ipAddress = &(ipv4->sin_addr);
inet_ntop(ipv4->sin_family, ipAddress, printableIP, sizeof(printableIP));
string ip(printableIP, strlen(printableIP));
return ip;
}
int main()
{
initiateWinsockFacility();
string targetDomain;
cout<<"Please enter a domain name: ";
cin>>targetDomain;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
getFullAddressInformation(targetDomain.c_str());
//get all ip's associated with the target domain
struct addrinfo *grabAllTargetIPs;
for(grabAllTargetIPs = target; grabAllTargetIPs != NULL; grabAllTargetIPs = grabAllTargetIPs->ai_next)
{
string fetchedIP = nslookup(grabAllTargetIPs);
cout<<fetchedIP<<endl;
}
freeaddrinfo(target);
WSACleanup();
cin.get();
return 0;
}
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