static fr_io_final_t mod_process(UNUSED void const *instance, REQUEST *request, fr_io_action_t action)
{
	rlm_rcode_t rcode;
	CONF_SECTION *unlang;

	REQUEST_VERIFY(request);

	/*
	 *	Pass this through asynchronously to the module which
	 *	is waiting for something to happen.
	 */
	if (action != FR_IO_ACTION_RUN) {
		unlang_signal(request, (fr_state_signal_t) action);
		return FR_IO_DONE;
	}

	switch (request->request_state) {
	case REQUEST_INIT:
		request->component = "radius";

		unlang = cf_section_find(request->server_cs, "new", "client");
		if (!unlang) {
			RWDEBUG("Failed to find 'new client' section");
			request->reply->code = FR_CODE_ACCESS_REJECT;
			goto send_reply;
		}

		RDEBUG("Running 'new client' from file %s", cf_filename(unlang));
		unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);

		request->request_state = REQUEST_RECV;
		/* FALL-THROUGH */

	case REQUEST_RECV:
		rcode = unlang_interpret_resume(request);

		if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;

		if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;

		rad_assert(request->log.unlang_indent == 0);

		switch (rcode) {
		case RLM_MODULE_OK:
		case RLM_MODULE_UPDATED:
			request->reply->code = FR_CODE_ACCESS_ACCEPT;
			break;

		case RLM_MODULE_FAIL:
		case RLM_MODULE_HANDLED:
			request->reply->code = 0; /* don't reply */
			break;

		default:
		case RLM_MODULE_REJECT:
			request->reply->code = FR_CODE_ACCESS_REJECT;
			break;
		}

		unlang = cf_section_find(request->server_cs, "add", "client");
		if (!unlang) goto send_reply;

	rerun_nak:
		RDEBUG("Running '%s client' from file %s", cf_section_name1(unlang), cf_filename(unlang));
		unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);

		request->request_state = REQUEST_SEND;
		/* FALL-THROUGH */

	case REQUEST_SEND:
		rcode = unlang_interpret_resume(request);

		if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;

		if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;

		rad_assert(request->log.unlang_indent == 0);

		switch (rcode) {
		case RLM_MODULE_NOOP:
		case RLM_MODULE_OK:
		case RLM_MODULE_UPDATED:
		case RLM_MODULE_HANDLED:
			/* reply is already set */
			break;

		default:
			/*
			 *	If we over-ride an ACK with a NAK, run
			 *	the NAK section.
			 */
			if (request->reply->code != FR_CODE_ACCESS_REJECT) {
				RWDEBUG("Failed running 'add client', trying 'deny client'.");

			deny:
				request->reply->code = FR_CODE_ACCESS_REJECT;

				unlang = cf_section_find(request->server_cs, "deny", "client");
				if (unlang) goto rerun_nak;

				RWDEBUG("Not running 'deny client' section as it does not exist");
			}
			break;
		}

		if (request->reply->code == FR_CODE_ACCESS_ACCEPT) {
			VALUE_PAIR *vp;

			vp = fr_pair_find_by_da(request->control, attr_freeradius_client_ip_address, TAG_ANY);
			if (!vp) fr_pair_find_by_da(request->control, attr_freeradius_client_ipv6_address, TAG_ANY);
			if (!vp) fr_pair_find_by_da(request->control, attr_freeradius_client_ip_prefix, TAG_ANY);
			if (!vp) fr_pair_find_by_da(request->control, attr_freeradius_client_ipv6_prefix, TAG_ANY);
			if (!vp) {
				ERROR("The 'control' list MUST contain a FreeRADIUS-Client.. IP address attribute");
				goto deny;
			}

			vp = fr_pair_find_by_da(request->control, attr_freeradius_client_secret, TAG_ANY);
			if (!vp) {
				ERROR("The 'control' list MUST contain a FreeRADIUS-Client-Secret attribute");
				goto deny;
			}

			/*
			 *	Else we're flexible.
			 */
		}

	send_reply:
		/*
		 *	This is an internally generated request.  Don't print IP addresses.
		 */
		if (request->reply->code == FR_CODE_ACCESS_ACCEPT) {
			RDEBUG("Adding client");
		} else {
			RDEBUG("Denying client");
		}
		break;

	default:
		return FR_IO_FAIL;
	}

	return FR_IO_REPLY;
}
static fr_io_final_t mod_process(UNUSED void const *instance, REQUEST *request, fr_io_action_t action)
{
	VALUE_PAIR		*vp;
	rlm_rcode_t		rcode;
	CONF_SECTION		*unlang;

	REQUEST_VERIFY(request);

	/*
	 *	Pass this through asynchronously to the module which
	 *	is waiting for something to happen.
	 */
	if (action != FR_IO_ACTION_RUN) {
		unlang_signal(request, (fr_state_signal_t) action);
		return FR_IO_DONE;
	}

	switch (request->request_state) {
	case REQUEST_INIT:
		RDEBUG("Received %s ID %i",
		       fr_dict_enum_alias_by_value(attr_packet_type, fr_box_uint32(request->reply->code)),
		       request->packet->id);
		log_request_pair_list(L_DBG_LVL_1, request, request->packet->vps, "");

		request->component = "radius";

		unlang = cf_section_find(request->server_cs, "recv", NULL);
		if (!unlang) {
			REDEBUG("Failed to find 'recv' section");
			return FR_IO_FAIL;
		}

		RDEBUG("Running 'recv' from file %s", cf_filename(unlang));
		unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);

		request->request_state = REQUEST_RECV;
		/* FALL-THROUGH */

	case REQUEST_RECV:
		rcode = unlang_interpret_continue(request);

		if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;

		if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;

		rad_assert(request->log.unlang_indent == 0);

		switch (rcode) {
		/*
		 *	The module has a number of OK return codes.
		 */
		case RLM_MODULE_OK:
		case RLM_MODULE_UPDATED:
			switch (request->packet->code) {
			case FR_CODE_ACCOUNTING_REQUEST:
				request->reply->code = FR_CODE_ACCOUNTING_RESPONSE;
				break;

			case FR_CODE_COA_REQUEST:
				request->reply->code = FR_CODE_COA_ACK;
				break;

			case FR_CODE_DISCONNECT_REQUEST:
				request->reply->code = FR_CODE_DISCONNECT_ACK;
				break;

			default:
				request->reply->code = 0;
				break;
			}
			break;

		case RLM_MODULE_HANDLED:
			break;

		/*
		 *	The module failed, or said the request is
		 *	invalid, therefore we stop here.
		 */
		case RLM_MODULE_NOOP:
		case RLM_MODULE_FAIL:
		case RLM_MODULE_INVALID:
		case RLM_MODULE_NOTFOUND:
		case RLM_MODULE_REJECT:
		case RLM_MODULE_USERLOCK:
		default:
			request->reply->code = 0;
			break;
		}

		/*
		 *	Allow for over-ride of reply code.
		 */
		vp = fr_pair_find_by_da(request->reply->vps, attr_packet_type, TAG_ANY);
		if (vp) request->reply->code = vp->vp_uint32;

		if (request->reply->code == FR_CODE_DO_NOT_RESPOND) {
			RWARN("Ignoring 'do_not_respond' as it does not apply to detail files");
		}

		unlang = cf_section_find(request->server_cs, "send", "ok");
		if (!unlang) goto send_reply;

		RDEBUG("Running 'send %s { ... }' from file %s", cf_section_name2(unlang), cf_filename(unlang));
		unlang_push_section(request, unlang, RLM_MODULE_NOOP, UNLANG_TOP_FRAME);

		request->request_state = REQUEST_SEND;
		/* FALL-THROUGH */

	case REQUEST_SEND:
		rcode = unlang_interpret_continue(request);

		if (request->master_state == REQUEST_STOP_PROCESSING) return FR_IO_DONE;

		if (rcode == RLM_MODULE_YIELD) return FR_IO_YIELD;

		rad_assert(request->log.unlang_indent == 0);

		switch (rcode) {
		case RLM_MODULE_NOOP:
		case RLM_MODULE_OK:
		case RLM_MODULE_UPDATED:
		case RLM_MODULE_HANDLED:
			/* reply is already set */
			break;

		default:
			request->reply->code = 0;
			break;
		}

	send_reply:
		/*
		 *	Failed, but we still reply with a magic code,
		 *	so that the reader can retransmit.
		 */
		if (!request->reply->code) {
			REDEBUG("Failed ID %i", request->reply->id);
		} else {
			RDEBUG("Sent %s ID %i",
			       fr_dict_enum_alias_by_value(attr_packet_type, fr_box_uint32(request->reply->code)),
			       request->reply->id);
		}

		log_request_proto_pair_list(L_DBG_LVL_1, request, request->reply->vps, "");
		break;

	default:
		return FR_IO_FAIL;
	}

	return FR_IO_REPLY;
}