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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- SocketManager.cxx
#include <winsock2.h>
#include <list>
#include <rfb/LogWriter.h>
#include <rfb_win32/SocketManager.h>
using namespace rfb;
using namespace rfb::win32;
static LogWriter vlog("SocketManager");
// -=- SocketManager
SocketManager::SocketManager() {
}
SocketManager::~SocketManager() {
}
static void requestAddressChangeEvents(network::SocketListener* sock_) {
DWORD dummy = 0;
if (WSAIoctl(sock_->getFd(), SIO_ADDRESS_LIST_CHANGE, 0, 0, 0, 0, &dummy, 0, 0) == SOCKET_ERROR) {
DWORD err = WSAGetLastError();
if (err != WSAEWOULDBLOCK)
vlog.error("Unable to track address changes: 0x%08x", (unsigned)err);
}
}
void SocketManager::addListener(network::SocketListener* sock_,
network::SocketServer* srvr,
AddressChangeNotifier* acn) {
WSAEVENT event = WSACreateEvent();
long flags = FD_ACCEPT | FD_CLOSE;
if (acn)
flags |= FD_ADDRESS_LIST_CHANGE;
try {
if (event && (WSAEventSelect(sock_->getFd(), event, flags) == SOCKET_ERROR))
throw rdr::SystemException("Unable to select on listener", WSAGetLastError());
// requestAddressChangeEvents MUST happen after WSAEventSelect, so that the socket is non-blocking
if (acn)
requestAddressChangeEvents(sock_);
// addEvent is the last thing we do, so that the event is NOT registered if previous steps fail
if (!event || !addEvent(event, this))
throw rdr::Exception("Unable to add listener");
} catch (rdr::Exception& e) {
if (event)
WSACloseEvent(event);
delete sock_;
vlog.error("%s", e.str());
throw;
}
ListenInfo li;
li.sock = sock_;
li.server = srvr;
li.notifier = acn;
listeners[event] = li;
}
void SocketManager::remListener(network::SocketListener* sock) {
std::map<HANDLE,ListenInfo>::iterator i;
for (i=listeners.begin(); i!=listeners.end(); i++) {
if (i->second.sock == sock) {
removeEvent(i->first);
WSACloseEvent(i->first);
delete sock;
listeners.erase(i);
return;
}
}
throw rdr::Exception("Listener not registered");
}
void SocketManager::addSocket(network::Socket* sock_, network::SocketServer* srvr, bool outgoing) {
WSAEVENT event = WSACreateEvent();
if (!event || !addEvent(event, this) ||
(WSAEventSelect(sock_->getFd(), event, FD_READ | FD_CLOSE) == SOCKET_ERROR)) {
if (event)
WSACloseEvent(event);
delete sock_;
vlog.error("Unable to add connection");
return;
}
ConnInfo ci;
ci.sock = sock_;
ci.server = srvr;
connections[event] = ci;
srvr->addSocket(sock_, outgoing);
}
void SocketManager::remSocket(network::Socket* sock_) {
std::map<HANDLE,ConnInfo>::iterator i;
for (i=connections.begin(); i!=connections.end(); i++) {
if (i->second.sock == sock_) {
i->second.server->removeSocket(sock_);
removeEvent(i->first);
WSACloseEvent(i->first);
delete sock_;
connections.erase(i);
return;
}
}
throw rdr::Exception("Socket not registered");
}
int SocketManager::checkTimeouts() {
int timeout = EventManager::checkTimeouts();
std::map<HANDLE,ListenInfo>::iterator i;
for (i=listeners.begin(); i!=listeners.end(); i++)
soonestTimeout(&timeout, i->second.server->checkTimeouts());
std::list<network::Socket*> shutdownSocks;
std::map<HANDLE,ConnInfo>::iterator j, j_next;
for (j=connections.begin(); j!=connections.end(); j=j_next) {
j_next = j; j_next++;
if (j->second.sock->isShutdown())
shutdownSocks.push_back(j->second.sock);
}
std::list<network::Socket*>::iterator k;
for (k=shutdownSocks.begin(); k!=shutdownSocks.end(); k++)
remSocket(*k);
return timeout;
}
void SocketManager::processEvent(HANDLE event) {
if (listeners.count(event)) {
ListenInfo li = listeners[event];
// Accept an incoming connection
vlog.debug("accepting incoming connection");
// What kind of event is this?
WSANETWORKEVENTS network_events;
WSAEnumNetworkEvents(li.sock->getFd(), event, &network_events);
if (network_events.lNetworkEvents & FD_ACCEPT) {
network::Socket* new_sock = li.sock->accept();
if (new_sock && li.server->getDisable()) {
delete new_sock;
new_sock = 0;
}
if (new_sock)
addSocket(new_sock, li.server, false);
} else if (network_events.lNetworkEvents & FD_CLOSE) {
vlog.info("deleting listening socket");
remListener(li.sock);
} else if (network_events.lNetworkEvents & FD_ADDRESS_LIST_CHANGE) {
li.notifier->processAddressChange(li.sock);
requestAddressChangeEvents(li.sock);
} else {
vlog.error("unknown listener event: %lx", network_events.lNetworkEvents);
}
} else if (connections.count(event)) {
ConnInfo ci = connections[event];
try {
// Process data from an active connection
// Cancel event notification for this socket
if (WSAEventSelect(ci.sock->getFd(), event, 0) == SOCKET_ERROR)
throw rdr::SystemException("unable to disable WSAEventSelect:%u", WSAGetLastError());
// Reset the event object
WSAResetEvent(event);
// Call the socket server to process the event
ci.server->processSocketEvent(ci.sock);
if (ci.sock->isShutdown()) {
remSocket(ci.sock);
return;
}
// Re-instate the required socket event
// If the read event is still valid, the event object gets set here
if (WSAEventSelect(ci.sock->getFd(), event, FD_READ | FD_CLOSE) == SOCKET_ERROR)
throw rdr::SystemException("unable to re-enable WSAEventSelect:%u", WSAGetLastError());
} catch (rdr::Exception& e) {
vlog.error("%s", e.str());
remSocket(ci.sock);
}
}
}
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