Function packet_receive

src/remote/inet.cpp:2950–3142

#endif

static bool packet_receive(rem_port* port, UCHAR* buffer, SSHORT buffer_length, SSHORT* length)
{
/**************************************
 *
 *	p a c k e t _ r e c e i v e
 *
 **************************************
 *
 * Functional description
 *	Receive a packet and pass on it's goodness.  If it's good,
 *	return true and the reported length of the packet, and update
 *	the receive sequence number.  If it's bad, return false.  If it's
 *	a duplicate message, just ignore it.
 *
 **************************************/

	if (port->port_flags & PORT_disconnect) {
		return false;
	}

	timeval timeout;
	timeout.tv_usec = 0;
	timeval* time_ptr = NULL;

	if (port->port_protocol == 0)
	{
		// If the protocol is 0 we are still in the process of establishing
		// a connection. Add a time out to the wait.
		timeout.tv_sec = port->port_connect_timeout;
		time_ptr = &timeout;
	}
	else if (port->port_dummy_packet_interval > 0)
	{
		// Set the time interval for sending dummy packets to the client
		timeout.tv_sec = port->port_dummy_packet_interval;
		time_ptr = &timeout;
	}

	// On Linux systems (and possibly others too) select will eventually
	// change timout values so save it here for later reuse.
	// Thanks to Brad Pepers who reported this bug  FSG 3 MAY 2001
	const timeval savetime = timeout;

	const SOCKET ph = port->port_handle;
	if (ph == INVALID_SOCKET)
	{
		const bool releasePort = (port->port_flags & PORT_server);
		if (!(port->port_flags & PORT_disconnect) && releasePort)
			inet_error(true, port, "invalid socket in packet_receive", isc_net_read_err, EINVAL);

		return false;
	}

	// Unsed to send a dummy packet, but too big to be defined in the loop.
	PACKET packet;

	int n = 0;
	int inetErrNo;