codice:
#include <stdio.h>
#include <winsock.h>
#include <stdlib.h>
//#define PORT 6644
#define PORT 25
#define MESHELO "EHLO ciao\r\n\0"
#define MESQUIT "QUIT\r\n\0"
#define MESMFROM "MAIL FROM: <pippo@tin.it>\r\n\0"
#define MESRCPT "RCPT TO:<pluto@tiscali.it>\r\n\0"
#define MESDATA "DATA\r\n\0"
#define MESSAGEP "prova email\r\n\0"
#define MESPUNTO ".\r\n\0"
#define MESHELP "HELPP DATA\r\n\0"
#define MESNOOP "NOOP\r\n\0"
#define MESAUTH "AUTH PLAIN\r\n\0"
#define MESAUTHL "AUTH=\r\n\0"
#define MAX_STRING 5120
void client(char *);
void error(char *);
int InitializeWinsock(WORD );
void Usage();
int main(int argc, char *argv[])
{
if ( argc < 2 ) Usage();
if (strcmp(argv[1], "client") == 0 )
{
// initialize wsock32.dll, requesting winsock 1.1
if (argc!=3 ) Usage();
if (!InitializeWinsock (MAKEWORD(1,1) ) ) return 1;
client(argv[2]);
WSACleanup();
}
return 0;
}
void client(char * server_IP)
{
SOCKET fd; // "file" descriptor for the network socket
SOCKADDR_IN saddr;
char buf[MAX_STRING];
struct hostent *h;
if ((h=gethostbyname(server_IP)) == NULL) { /* get the host info */
error("gethostbyname");
exit(1);
}
printf("Host name : %s\n", h->h_name);
printf("IP Address : %s\n\n",inet_ntoa(*((struct in_addr *)h->h_addr)));
if ((fd=socket(AF_INET,SOCK_STREAM,0)) == INVALID_SOCKET)
error("Client: socket not connected ");
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = inet_addr(inet_ntoa(*((struct in_addr *)h->h_addr)));
saddr.sin_port = htons(PORT);
// request connection to server socket (remote machine)
if (connect(fd, (LPSOCKADDR) &saddr, sizeof(saddr)) == SOCKET_ERROR)
error("Client: connect ");
if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
error("Client: receiving failure ");
printf("Server echoed1 '%s' \n",buf);
if( send(fd, MESHELO, strlen(MESHELO)+1, 0) == SOCKET_ERROR )
error("Server: sending failure ");
if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
error("Client: receiving failure ");
printf("Server echoed2 '%s' \n",buf);
//----
//if( send(fd, MESHELP, strlen(MESHELP)+1, 0) == SOCKET_ERROR )
// error("Server: sending failure ");
send(fd, MESAUTH, strlen(MESAUTH)+1, 0);
if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
error("Client: receiving failure ");
printf("Server echoed3 '%s' \n",buf);
if( send(fd, MESQUIT, strlen(MESQUIT)+1, 0) == SOCKET_ERROR )
error("Server: sending failure ");
if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
error("Client: receiving failure ");
printf("Server echoed4 '%s' \n",buf);
//<<<<<
//---
/*
//if( send(fd, MESMFROM, strlen(MESMFROM)+1, 0) == SOCKET_ERROR )
// error("Server: sending failure ");
//if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
// error("Client: receiving failure ");
//printf("Server echoed3 '%s' \n",buf);
//if( send(fd, MESRCPT, strlen(MESRCPT)+1, 0) == SOCKET_ERROR )
// error("Server: sending failure ");
//if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
// error("Client: receiving failure ");
//printf("Server echoed4 '%s' \n",buf);
//if( send(fd, MESDATA, strlen(MESDATA)+1, 0) == SOCKET_ERROR )
// error("Server: sending failure ");
//if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
// error("Client: receiving failure ");
printf("Server echoed5 '%s' \n",buf);
//if( send(fd, MESSAGEP, strlen(MESSAGEP)+1, 0) == SOCKET_ERROR )
// error("Server: sending failure ");
if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
error("Client: receiving failure ");
printf("Server echoed6 '%s' \n",buf);
//if( send(fd, MESPUNTO, strlen(MESPUNTO)+1, 0) == SOCKET_ERROR )
// error("Server: sending failure ");
if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
error("Client: receiving failure ");
printf("Server echoed7 '%s' \n",buf);
//if( send(fd, MESQUIT, strlen(MESQUIT)+1, 0) == SOCKET_ERROR )
// error("Server: sending failure ");
if( recv(fd, buf, sizeof(buf), 0) == SOCKET_ERROR )
error("Client: receiving failure ");
printf("Server echoed8 '%s' \n",buf);
*/
printf("Sending 'Connection Closing' command\n\n");
if (closesocket(fd) == SOCKET_ERROR)
error("Client: closing socket ");
}
/**********************************************
* Windows Sockets Initialization *
**********************************************/
int InitializeWinsock(WORD wVersionRequested)
{
WSADATA wsaData;
int err;
err = WSAStartup(wVersionRequested, &wsaData);
// ritorna errore se, ad esempio, l'applicazione supporta al massimo
// la versione 1.1 e la DLL supporta da 2.0 in su (le versioni non si sovrappongono)
if (err!=0) return 0; // Tell the user that we couldn't find a usable winsock.dll
// WSAStartup returns in wHighVersion (struct wsaData) the highest version it supports
// and in wVersion the minimum of its high version and wVersionRequested.
// wVersion is the The version of the Windows Sockets specification
// that the Windows Sockets DLL expects the caller to use.
// Se WSAStartup ritorna un risultato accettabile, l'applicazione deve ancora
// verificare che il risultato sia compatibile con la sua richiesta. Ad esempio,
// con wVersionRequested=1.1 e DLL version 1.0, wVersion=1.0. Se l'applicazione
// vuole assolutamente usare la DLL 1.1, deve ancora verificare di non trovarsi
// in questo caso
// Tell the user that we couldn't find a usable winsock.dll.
if (LOBYTE(wsaData.wVersion )!=1 || HIBYTE(wsaData.wVersion)!=1) return 0;
//Everything is fine: proceed
return 1;
}
/**********************************************
* Error Handling Functions *
**********************************************/
void Usage()
{
printf("\n\t Usage: tcp_sock server | client ip_server_address\n\n");
exit(1);
}
// define to save space
#define PERR(X) fprintf(stderr, X); break
void error(char* string) {
int err;
fprintf(stderr, "%s", string);
err= WSAGetLastError();
//in Windows, gli errori dovuti ai sockets sono mappati oltre 10000
switch (err)
{
case WSANOTINITIALISED:
PERR("A successful WSAStartup() must occur before using this API.");
case WSAENETDOWN:
PERR("The Windows Sockets implementation has detected that the network subsystem has failed.");
case WSAEAFNOSUPPORT:
PERR("The specified address family is not supported.");
case WSAEINPROGRESS:
PERR("A blocking Windows Sockets operation is in progress.");
case WSAEMFILE:
PERR("No more file descriptors are available.");
case WSAENOBUFS:
PERR("No buffer space is available. The socket cannot be created.");
case WSAEPROTONOSUPPORT:
PERR("The specified protocol is not supported.");
case WSAEPROTOTYPE:
PERR("The specified protocol is the wrong type for this socket.");
case WSAESOCKTNOSUPPORT:
PERR("The specified socket type is not supported in this address family.");
case WSAEADDRINUSE:
PERR("The specified address is already in use. (See setsockopt() SO_REUSEADDR option)");
case WSAEFAULT:
PERR("The namelen argument is too small (less than the size of a struct sockaddr).");
case WSAEINTR:
PERR("The (blocking) call was canceled via WSACancelBlockingCall()");
case WSAEINVAL:
PERR("The socket is already bound to an address.");
case WSAENOTSOCK:
PERR("The descriptor is not a socket.");
case WSAEADDRNOTAVAIL:
PERR("Address not availabile");
case WSAEISCONN:
PERR("The socket is already connected.");
case WSAEOPNOTSUPP:
PERR("The referenced socket is not of a type that supports the listen() operation.");
case WSAEWOULDBLOCK:
PERR("The socket is marked as non-blocking and no connections are present to be accepted.");
case WSAECONNREFUSED:
PERR("The attempt to connect was forcefully rejected.");
case WSAEDESTADDRREQ:
PERR("A destination address is required.");
case WSAENETUNREACH:
PERR("The network can't be reached from this host at this time.");
case WSAETIMEDOUT:
PERR("Attempt to connect timed out without establishing a connection");
case WSAECONNRESET:
PERR("Connection reset");
default:
fprintf(stderr, "Error reported by WSAGetLastError= %d\n Check winsock.h.\n\n", err); break;
};
exit(1);
}
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