C++ en Exploits

Hola red-t
mmm, puede que seas duro como yo y hasta que no te muestran la pared no te das con ella.

Recien estoy aprendiendo programacion de socket, y te muestro un programa que envia, a un server que se esta ejecutando en la misma maquina, un hola server.
Por más indicaciones que tenga, es impocible entenderlo sin conocer C++ y las teorias de conecciones.

Código:

/*create simple client TCP_IP*/
#include <winsock.h>
#include <iostream>
#define U_PORT 6000
#define BIND_ERROR SOCKET_ERROR
#define CONNECT_ERROR SOCKET_ERROR
#include<conio2.h>
#include<string.h>
using namespace std;
void erroresbind(int);
void erroresconn(int);
int main(int argc, char *argv[])
{
char bufsend[14];
char bufrecv[14];
WSAData WSApepenet;
int usocket;
sockaddr_in udata_in;
struct hostent* uhost;
int sizedata=sizeof(struct sockaddr);
//-----------------------
cout<<"\nIniciando DLLs...";
if (WSAStartup(MAKEWORD(1, 1), &WSApepenet))
{
cerr << "\nWSAStartup fallo...";
getch();
return 1;
}
//------------------------
cout<<"\nObteniendo IP (localhost)...";
uhost=(struct hostent*)gethostbyname("localhost");
if(!uhost)
{
cerr << "\ngethostbyname fallo...";
WSACleanup();
getch();
return 1;
}
//-------------------------
cout<<"\nObteniendo socket de comunicación (TCP_IP)...";
if(INVALID_SOCKET==(usocket=socket(PF_INET,SOCK_STREAM,0)))
{
cerr<<"\nSoket Invalido, la función socket fallo...";
WSACleanup();
getch();
return 1;
}
//-------------------
cout<<"\nLlenando datos a la estructura...";
memset(&udata_in,0,sizeof(struct sockaddr_in));
memcpy(&udata_in.sin_addr,uhost->h_addr,uhost->h_length);
udata_in.sin_family=uhost->h_addrtype;
udata_in.sin_port=htons(U_PORT);
//----------------
cout<<"\nConectandonos al server...";
if(CONNECT_ERROR==(connect(usocket,(struct sockaddr*)& udata_in,sizedata)))
{
cerr<<"\nconect failure";
erroresconn(WSAGetLastError());
closesocket(usocket);
WSACleanup();
getch();
return 1;
}
//---------
cout<<"\nConeccion saliente hacia: "<<inet_ntoa(udata_in.sin_addr);
//-------
cout<<"\nDando la bienvenida...";
strcpy(bufsend,"hello server");
send(usocket,bufsend,sizeof(bufsend),0);
cout<<"\n Se envio un: "<<bufsend;
//----------------
cout<<"\nReciviendo datos...";
recv(usocket,bufrecv,sizeof(bufrecv),0);
cout<<"\nSe recivio un: "<<bufrecv;
cout<<"\nFin de la comunicacion...";
//--------------------
closesocket(usocket);
WSACleanup();
getch();
return 0;
}
void erroresbind(int error)
{
switch(error){
case WSANOTINITIALISED: cout<<"\nEl éxito de WSAStartup todavía no se realizó";
break;
case WSAENETDOWN:cout<<"\nNetwork is down.";
break;
case WSAEACCES:cout<<"\nPermission denied.";
break;
case WSAEADDRINUSE:cout<<"\nAddress already in use.";
break;
case WSAEADDRNOTAVAIL:cout<<"\nNo se puede asignar la dirección solicitada.";
break;
case WSAEFAULT:cout<<"\nBad address.";
break;
case WSAEINPROGRESS:cout<<"\noperacion de bloqueo en curso.";
break;
case WSAEINVAL:cout<<"\nInvalid argument.";
break;
case WSAENOBUFS:cout<<"\nNo buffer space available.";
break;
case WSAENOTSOCK:cout<<"\nSocket operation on nonsocket.";
break;
default:cout<<"\nError desconocido!!!";
break;
}
}
void erroresconn(int error)
{
switch(error){
case WSANOTINITIALISED: cout<<"\nEl éxito de WSAStartup todavía no se realizó";
break;
case WSAENETDOWN:cout<<"\nNetwork is down.";
break;
case WSAEADDRINUSE:cout<<"\nAddress already in use.";
break;
case WSAEINTR:cout<<"\nThe blocking Windows Socket 1.1 call was canceled through WSACancelBlockingCall.";
break;
case WSAEINPROGRESS:cout<<"\noperacion de bloqueo en curso.";
break;
case WSAEALREADY:cout<<"\nA nonblocking connect call is in progress on the specified socket.";
break;
case WSAEADDRNOTAVAIL:cout<<"\nThe remote address is not a valid address (such as ADDR_ANY).";
break;
case WSAEAFNOSUPPORT:cout<<"\nAddresses in the specified family cannot be used with this socket.";
break;
case WSAECONNREFUSED:cout<<"\nNo hay servidor ejecutandoce.\n O se intenta bind y connect a una misma maquina.";
break;
case WSAEFAULT:cout<<"\nThe parameter s is a listening socket.";
break;
case WSAEINVAL:cout<<"\nInvalid argument.";
break;
case WSAEISCONN:cout<<"\nThe socket is already connected (connection-oriented sockets only).";
break;
case WSAENETUNREACH:cout<<"\nThe network cannot be reached from this host at this time.";
break;
case WSAEHOSTUNREACH:cout<<"\nA socket operation was attempted to an unreachable host.";
break;
case WSAENOBUFS:cout<<"\nNo buffer space is available. The socket cannot be connected.";
break;
case WSAENOTSOCK:cout<<"\nThe descriptor is not a socket.";
break;
case WSAETIMEDOUT:cout<<"\nAttempt to connect timed out without establishing a connection.";
break;
case WSAEWOULDBLOCK:cout<<"\nThe socket is marked as nonblocking and the connection cannot be completed immediately.";
break;
case WSAEACCES:cout<<"\nAttempt to connect datagram socket to broadcast address failed because setsockopt option SO_BROADCAST is not enabled.";
break;
default:cout<<"\nError desconocido!!!";
break;
}
}

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