Messages

1

Network / error regarding over-range ip address (socket.connect)

« on: November 12, 2013, 07:56:59 pm »

i was trying to make port scanner using the references  through this link :-   
http://www.cplusplus.com/articles/o2N36Up4/

so, i want to know  how does the function (constructor IpAddress(address) )resolve the IP address, which are over-range (not allowed for ex:- 256.256.256.256 ) !!!!!

I meant, when i tried to input an IP address like 256.256.256.256 (or and string, which is not a valid address like "vins_net" and port 8080) , the function return value.

here's the source code and screen shot :-

#include <iostream>
#include <SFML/Network.hpp>

bool port_open(const std::string& address, int port)
{
        sf::TcpSocket socket;
        bool open = (socket.connect (sf::IpAddress(address), port)==sf::Socket::Done);
        socket.disconnect();
        return open;
}
int main()
{ std::string address;
  int port;

  std::cout<<"Enter the ip address of the client: ";
  std::cin>>address;

  std::cout<<"\nEnter the port to scan: ";
  std::cin>>port;

  if(port_open(address, port))
          std::cout<<"The port "<<port<<" at IP:"<<address<<" is OPEN."<<std::endl;
  else
          std::cout<<"The port "<<port<<" at IP:"<<address<<" is CLOSED.";

  system("pause");
  return 0;
}