Function aux_request

src/remote/inet.cpp:1601–1707

}

static rem_port* aux_request( rem_port* port, PACKET* packet)
{
/**************************************
 *
 *	a u x _ r e q u e s t
 *
 **************************************
 *
 * Functional description
 *	A remote interface has requested the server prepare an auxiliary
 *	connection; the server calls aux_request to set up the connection.
 *
 **************************************/

	// listen on (local) address of the original socket
	SockAddr our_address;
	if (our_address.getsockname(port->port_handle) < 0)
	{
		gds__log("INET/aux_request: failed to get local address of the original socket");
		inet_error(false, port, "getsockname", isc_net_event_listen_err, INET_ERRNO);
	}
	unsigned short aux_port = port->getPortConfig()->getRemoteAuxPort();
	our_address.setPort(aux_port); // may be 0

	SOCKET n = os_utils::socket(our_address.family(), SOCK_STREAM, 0);
	if (n == INVALID_SOCKET)
	{
		inet_error(false, port, "socket", isc_net_event_listen_err, INET_ERRNO);
	}

	int optval;
#ifndef WIN_NT
	// dimitr:	on Windows, lack of SO_REUSEADDR works the same way as it was specified on POSIX,
	//			i.e. it allows binding to a port in a TIME_WAIT/FIN_WAIT state. If this option
	//			is turned on explicitly, then a port can be re-bound regardless of its state,
	//			e.g. while it's listening. This is surely not what we want.

	optval = TRUE;
	if (setsockopt(n, SOL_SOCKET, SO_REUSEADDR, (SCHAR*) &optval, sizeof(optval)) < 0)
	{
		inet_error(false, port, "setsockopt REUSE", isc_net_event_listen_err, INET_ERRNO);
	}
#endif

	optval = port->getPortConfig()->getIPv6V6Only() ? 1 : 0;
	// ignore failure, we already have it logged from the main listening port
	setsockopt(n, IPPROTO_IPV6, IPV6_V6ONLY, (SCHAR*) &optval, sizeof(optval));

	if (bind(n, our_address.ptr(), our_address.length()) < 0)
	{
		inet_error(false, port, "bind", isc_net_event_listen_err, INET_ERRNO);
	}

	if (our_address.getsockname(n) < 0)
	{
		inet_error(false, port, "getsockname", isc_net_event_listen_err, INET_ERRNO);
	}