boinc/client/win/win_net.cpp

// The contents of this file are subject to the Mozilla Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// http://www.mozilla.org/MPL/ 
// 
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License. 
// 
// The Original Code is the Berkeley Open Infrastructure for Network Computing. 
// 
// The Initial Developer of the Original Code is the SETI@home project.
// Portions created by the SETI@home project are Copyright (C) 2002
// University of California at Berkeley. All Rights Reserved. 
// 
// Contributor(s):
//

#include <afxwin.h>
#include <winsock.h>
#include <string.h>
#include <stdio.h>
#include <wininet.h>
#include <raserror.h>

#include "win_net.h"
#include "wingui.h"
#include "client_state.h"

#define DIAL_WAIT		60		// seconds after dial to wait (in case of cancel)
#define CONFIRM_WAIT	60		// seconds after user says not to connect to ask again
#define CLOSE_WAIT		5		// seconds after last call to close that the connection should be terminated

int net_ref_count = -1;			// -1 closed, 0 open but not used, >0 number of users
double net_last_req_time = 0;	// last time user was requested to connect in seconds
double net_last_dial_time = 0;	// last time modem was dialed
double net_close_time = 0;		// 0 don't close, >0 time when network connection should be terminated in seconds
bool dialed = false;

int NetOpen( void )
{
	if(net_ref_count >= 0) {
		net_ref_count ++;
		return 0;
	}

    WSADATA wsdata;
    WORD    wVersionRequested;
	int rc, addrlen = 16;

	typedef BOOL (WINAPI *GetStateProc)( OUT LPDWORD  lpdwFlags, IN DWORD    dwReserved);
	typedef BOOL (WINAPI *AutoDialProc)( IN DWORD    dwFlags, IN DWORD    dwReserved);

	GetStateProc GetState = NULL;
	AutoDialProc AutoDial = NULL;
	DWORD connectionFlags;
	HMODULE libmodule = NULL;

	libmodule = LoadLibrary("wininet.dll");
	if (libmodule) {
		GetState = (GetStateProc)GetProcAddress(libmodule, "InternetGetConnectedState");
		AutoDial = (AutoDialProc)GetProcAddress(libmodule, "InternetAutodial");

		if (GetState && AutoDial) {
			rc = (*GetState)(&connectionFlags, 0);

			// Don't Autodial if already connected to Internet by Modem or LAN 
			if (!rc) {
				if((double)time(NULL) < net_last_dial_time + CONFIRM_WAIT) {
					return -1;
				}

				if(gstate.global_prefs.confirm_before_connecting) {
					net_last_req_time = (double)time(NULL);
					if(!RequestNetConnect()) {
						return -1;
					}
				}

				net_last_dial_time = (double)time(NULL);
				rc = (*AutoDial)(INTERNET_AUTODIAL_FORCE_UNATTENDED, 0);
				if (rc) {
					dialed = true;
				} else {
					// InternetAutodial() returns error 86 for some users 
					// and 668 for some other users, but a subsequent call 
					// to gethostbyname() or connect() autodials successfully.
					// So (with one exception) we ignore failure returns 
					// from InternetAutodial() to work around this problem. 
					// Error 86 is "The specified Network Password is not correct."
					// Error 668 is RAS Error "The connection dropped."
					rc = GetLastError();
					// Don't continue if busy signal, no answer or user cancelled
					if (rc == ERROR_USER_DISCONNECTION) {
						return -1;
					}
				}
			}
		}
	}


	wVersionRequested = MAKEWORD(1, 1);
	rc = WSAStartup(wVersionRequested, &wsdata);
	if (rc) {
		return -1;
	}

	net_ref_count = 1;
	return 0;
}

void NetClose( void )
{
	if(net_ref_count > 0) net_ref_count --;
	if(net_ref_count == 0) {
		net_close_time = (double)time(NULL) + CLOSE_WAIT;
	}
}

void NetCheck( void ) {
	if(net_ref_count == 0 && net_close_time > 0 && net_close_time < (double)time(NULL)) {
 		WSACleanup();

		typedef BOOL (WINAPI *HangupProc)(IN DWORD    dwReserved);
		HangupProc HangUp = NULL;
		HMODULE libmodule = NULL;

		// Hang up the modem if we dialed it
		if (dialed && gstate.global_prefs.hangup_if_dialed) {
			libmodule = LoadLibrary("wininet.dll");
			if (libmodule) {
				HangUp = (HangupProc)GetProcAddress(libmodule, "InternetAutodialHangup");
				if (HangUp)	int rc = (* HangUp)(0);
			}
		}
		dialed = false;
		net_ref_count = -1;
		net_close_time = 0;
	}
}