void
Client::handleHello(const Event&, void*)
{
SInt16 major, minor;
if (!ProtocolUtil::readf(m_stream, kMsgHello, &major, &minor)) {
sendConnectionFailedEvent("Protocol error from server, check encryption settings");
cleanupTimer();
cleanupConnection();
return;
}
// check versions
LOG((CLOG_DEBUG1 "got hello version %d.%d", major, minor));
if (major < kProtocolMajorVersion ||
(major == kProtocolMajorVersion && minor < kProtocolMinorVersion)) {
sendConnectionFailedEvent(XIncompatibleClient(major, minor).what());
cleanupTimer();
cleanupConnection();
return;
}
// say hello back
LOG((CLOG_DEBUG1 "say hello version %d.%d", kProtocolMajorVersion, kProtocolMinorVersion));
ProtocolUtil::writef(m_stream, kMsgHelloBack,
kProtocolMajorVersion,
kProtocolMinorVersion, &m_name);
// now connected but waiting to complete handshake
setupScreen();
cleanupTimer();
// make sure we process any remaining messages later. we won't
// receive another event for already pending messages so we fake
// one.
if (m_stream->isReady()) {
m_events->addEvent(Event(m_events->forIStream().inputReady(),
m_stream->getEventTarget()));
}
}
void
CClientProxyUnknown::handleData(const CEvent&, void*)
{
LOG((CLOG_DEBUG1 "parsing hello reply"));
CString name("<unknown>");
try {
// limit the maximum length of the hello
UInt32 n = m_stream->getSize();
if (n > kMaxHelloLength) {
LOG((CLOG_DEBUG1 "hello reply too long"));
throw XBadClient();
}
// parse the reply to hello
SInt16 major, minor;
if (!CProtocolUtil::readf(m_stream, kMsgHelloBack,
&major, &minor, &name)) {
throw XBadClient();
}
// disallow invalid version numbers
if (major <= 0 || minor < 0) {
throw XIncompatibleClient(major, minor);
}
// remove stream event handlers. the proxy we're about to create
// may install its own handlers and we don't want to accidentally
// remove those later.
removeHandlers();
// create client proxy for highest version supported by the client
if (major == 1) {
switch (minor) {
case 0:
m_proxy = new CClientProxy1_0(name, m_stream);
break;
case 1:
m_proxy = new CClientProxy1_1(name, m_stream);
break;
case 2:
m_proxy = new CClientProxy1_2(name, m_stream);
break;
case 3:
m_proxy = new CClientProxy1_3(name, m_stream);
break;
}
}
// hangup (with error) if version isn't supported
if (m_proxy == NULL) {
throw XIncompatibleClient(major, minor);
}
// the proxy is created and now proxy now owns the stream
LOG((CLOG_DEBUG1 "created proxy for client \"%s\" version %d.%d", name.c_str(), major, minor));
m_stream = NULL;
// wait until the proxy signals that it's ready or has disconnected
addProxyHandlers();
return;
}
catch (XIncompatibleClient& e) {
// client is incompatible
LOG((CLOG_WARN "client \"%s\" has incompatible version %d.%d)", name.c_str(), e.getMajor(), e.getMinor()));
CProtocolUtil::writef(m_stream,
kMsgEIncompatible,
kProtocolMajorVersion, kProtocolMinorVersion);
}
catch (XBadClient&) {
// client not behaving
LOG((CLOG_WARN "protocol error from client \"%s\"", name.c_str()));
CProtocolUtil::writef(m_stream, kMsgEBad);
}
catch (XBase& e) {
// misc error
LOG((CLOG_WARN "error communicating with client \"%s\": %s", name.c_str(), e.what()));
}
sendFailure();
}
