assorted small netmgr-related changes

- rename isc_nmsocket_t->tcphandle to statichandle
- cancelread functions now take handles instead of sockets
- add a 'client' flag in socket objects, currently unused, to
  indicate whether it is to be used as a client or server socket

bin/rndc/rndc.c

@@ -1009,7 +1009,7 @@ main(int argc, char **argv) {
 	isc_mem_create(&rndc_mctx);
 	netmgr = isc_nm_start(rndc_mctx, 1);
 	DO("create task manager",
-	   isc_taskmgr_create(rndc_mctx, 1, 0, NULL, &taskmgr));
+	   isc_taskmgr_create(rndc_mctx, 1, 0, netmgr, &taskmgr));
 	DO("create task", isc_task_create(taskmgr, 0, &rndc_task));
 	isc_log_create(rndc_mctx, &log, &logconfig);
 	isc_log_setcontext(log);

bin/tests/system/pipelined/tests.sh

@@ -26,12 +26,10 @@ $DIFF ref output > /dev/null && { ret=1 ; echo_i "diff out of order failed"; }
 if [ $ret != 0 ]; then echo_i "failed"; fi
 status=`expr $status + $ret`
 
-# flush resolver so queries will be from others again
-$RNDCCMD 10.53.0.4 flush
-sleep 1
-
 echo_i "check pipelined TCP queries using mdig"
 ret=0
+$RNDCCMD 10.53.0.4 flush
+sleep 1
 $MDIG $MDIGOPTS +noall +answer +vc -f input -b 10.53.0.4 @10.53.0.4 > raw.mdig
 awk '{ print $1 " " $5 }' < raw.mdig > output.mdig
 sort < output.mdig > output-sorted.mdig
@@ -42,6 +40,8 @@ status=`expr $status + $ret`
 
 echo_i "check keep-response-order"
 ret=0
+$RNDCCMD 10.53.0.4 flush
+sleep 1
 $PIPEQUERIES -p ${PORT} ++ < inputb > rawb || ret=1
 awk '{ print $1 " " $5 }' < rawb > outputb
 $DIFF refb outputb || ret=1
@@ -50,6 +50,8 @@ status=`expr $status + $ret`
 
 echo_i "check keep-response-order using mdig"
 ret=0
+$RNDCCMD 10.53.0.4 flush
+sleep 1
 $MDIG $MDIGOPTS +noall +answer +vc -f inputb -b 10.53.0.7 @10.53.0.4 > rawb.mdig
 awk '{ print $1 " " $5 }' < rawb.mdig > outputb.mdig
 $DIFF refb outputb.mdig || ret=1
@@ -58,6 +60,8 @@ status=`expr $status + $ret`
 
 echo_i "check mdig -4 -6"
 ret=0
+$RNDCCMD 10.53.0.4 flush
+sleep 1
 $MDIG $MDIGOPTS -4 -6 -f input @10.53.0.4 > output46.mdig 2>&1 && ret=1
 grep "only one of -4 and -6 allowed" output46.mdig > /dev/null || ret=1
 if [ $ret != 0 ]; then echo_i "failed"; fi

lib/isc/include/isc/netmgr.h

@@ -176,8 +176,8 @@ isc_nm_listenudp(isc_nm_t *mgr, isc_nmiface_t *iface, isc_nm_recv_cb_t cb,
  * as its argument.
  *
  * When handles are allocated for the socket, 'extrasize' additional bytes
- * will be allocated along with the handle for an associated object
- * (typically ns_client).
+ * can be allocated along with the handle for an associated object, which
+ * can then be freed automatically when the handle is destroyed.
  */
 
 void
@@ -196,12 +196,17 @@ isc_nm_pause(isc_nm_t *mgr);
 void
 isc_nm_resume(isc_nm_t *mgr);
 /*%<
- * Resume paused processing. It will return immediately
- * after signalling workers to resume.
+ * Resume paused processing. It will return immediately after signalling
+ * workers to resume.
  */
 
 isc_result_t
 isc_nm_read(isc_nmhandle_t *handle, isc_nm_recv_cb_t cb, void *cbarg);
+/*
+ * Begin (or continue) reading on the socket associated with 'handle', and
+ * update its recv callback to 'cb', which will be called as soon as there
+ * is data to process.
+ */
 
 isc_result_t
 isc_nm_pauseread(isc_nmhandle_t *handle);

lib/isc/netmgr/netmgr-int.h

@@ -117,12 +117,10 @@ struct isc_nmiface {
 
 typedef enum isc__netievent_type {
 	netievent_udpsend,
-	netievent_udprecv,
 	netievent_udpstop,
 
 	netievent_tcpconnect,
 	netievent_tcpsend,
-	netievent_tcprecv,
 	netievent_tcpstartread,
 	netievent_tcppauseread,
 	netievent_tcpchildaccept,
@@ -130,8 +128,8 @@ typedef enum isc__netievent_type {
 	netievent_tcpstop,
 	netievent_tcpclose,
 
-	netievent_tcpdnsclose,
 	netievent_tcpdnssend,
+	netievent_tcpdnsclose,
 
 	netievent_closecb,
 	netievent_shutdown,
@@ -146,20 +144,12 @@ typedef enum isc__netievent_type {
 	netievent_tcplisten,
 } isc__netievent_type;
 
-/*
- * We have to split it because we can read and write on a socket
- * simultaneously.
- */
 typedef union {
 	isc_nm_recv_cb_t recv;
+	isc_nm_cb_t connect;
 	isc_nm_accept_cb_t accept;
 } isc__nm_readcb_t;
 
-typedef union {
-	isc_nm_cb_t send;
-	isc_nm_cb_t connect;
-} isc__nm_writecb_t;
-
 typedef union {
 	isc_nm_recv_cb_t recv;
 	isc_nm_accept_cb_t accept;
@@ -209,10 +199,10 @@ typedef isc__netievent__socket_t isc__netievent_udplisten_t;
 typedef isc__netievent__socket_t isc__netievent_udpstop_t;
 typedef isc__netievent__socket_t isc__netievent_tcpstop_t;
 typedef isc__netievent__socket_t isc__netievent_tcpclose_t;
-typedef isc__netievent__socket_t isc__netievent_tcpdnsclose_t;
 typedef isc__netievent__socket_t isc__netievent_startread_t;
 typedef isc__netievent__socket_t isc__netievent_pauseread_t;
 typedef isc__netievent__socket_t isc__netievent_closecb_t;
+typedef isc__netievent__socket_t isc__netievent_tcpdnsclose_t;
 
 typedef struct isc__netievent__socket_req {
 	isc__netievent_type type;
@@ -333,7 +323,7 @@ typedef enum isc_nmsocket_type {
 	isc_nm_tcpsocket,
 	isc_nm_tcplistener,
 	isc_nm_tcpdnslistener,
-	isc_nm_tcpdnssocket
+	isc_nm_tcpdnssocket,
 } isc_nmsocket_type;
 
 /*%
@@ -403,7 +393,7 @@ struct isc_nmsocket {
 	isc_nmsocket_t *children;
 	int nchildren;
 	isc_nmiface_t *iface;
-	isc_nmhandle_t *tcphandle;
+	isc_nmhandle_t *statichandle;
 	isc_nmhandle_t *outerhandle;
 
 	/*% Extra data allocated at the end of each isc_nmhandle_t */
@@ -445,7 +435,12 @@ struct isc_nmsocket {
 	isc_refcount_t references;
 
 	/*%
-	 * TCPDNS socket has been set not to pipeliine.
+	 * Established an outgoing connection, as client not server.
+	 */
+	atomic_bool client;
+
+	/*%
+	 * TCPDNS socket has been set not to pipeline.
 	 */
 	atomic_bool sequential;
 
@@ -686,6 +681,9 @@ isc__nm_tcp_send(isc_nmhandle_t *handle, isc_region_t *region, isc_nm_cb_t cb,
 
 isc_result_t
 isc__nm_tcp_read(isc_nmhandle_t *handle, isc_nm_recv_cb_t cb, void *cbarg);
+/*
+ * Back-end implementation of isc_nm_read() for TCP handles.
+ */
 
 void
 isc__nm_tcp_close(isc_nmsocket_t *sock);
@@ -713,9 +711,9 @@ isc__nm_tcp_shutdown(isc_nmsocket_t *sock);
  */
 
 void
-isc__nm_tcp_cancelread(isc_nmsocket_t *sock);
+isc__nm_tcp_cancelread(isc_nmhandle_t *handle);
 /*%<
- * Stop reading on a connected socket.
+ * Stop reading on a connected TCP handle.
  */
 
 void

lib/isc/netmgr/netmgr.c

@@ -591,6 +591,7 @@ process_queue(isc__networker_t *worker, isc_queue_t *queue) {
 			uv_stop(&worker->loop);
 			isc_mempool_put(worker->mgr->evpool, ievent);
 			return;
+
 		case netievent_udplisten:
 			isc__nm_async_udplisten(worker, ievent);
 			break;
@@ -600,6 +601,7 @@ process_queue(isc__networker_t *worker, isc_queue_t *queue) {
 		case netievent_udpsend:
 			isc__nm_async_udpsend(worker, ievent);
 			break;
+
 		case netievent_tcpconnect:
 			isc__nm_async_tcpconnect(worker, ievent);
 			break;
@@ -630,9 +632,11 @@ process_queue(isc__networker_t *worker, isc_queue_t *queue) {
 		case netievent_tcpclose:
 			isc__nm_async_tcpclose(worker, ievent);
 			break;
+
 		case netievent_tcpdnsclose:
 			isc__nm_async_tcpdnsclose(worker, ievent);
 			break;
+
 		case netievent_closecb:
 			isc__nm_async_closecb(worker, ievent);
 			break;
@@ -739,7 +743,7 @@ nmsocket_cleanup(isc_nmsocket_t *sock, bool dofree) {
 		isc__nm_decstats(sock->mgr, sock->statsindex[STATID_ACTIVE]);
 	}
 
-	sock->tcphandle = NULL;
+	sock->statichandle = NULL;
 
 	if (sock->outerhandle != NULL) {
 		isc_nmhandle_unref(sock->outerhandle);
@@ -833,7 +837,7 @@ nmsocket_maybe_destroy(isc_nmsocket_t *sock) {
 		}
 	}
 
-	if (active_handles == 0 || sock->tcphandle != NULL) {
+	if (active_handles == 0 || sock->statichandle != NULL) {
 		destroy = true;
 	}
 
@@ -1051,7 +1055,7 @@ isc__nmhandle_get(isc_nmsocket_t *sock, isc_sockaddr_t *peer,
 	if (handle == NULL) {
 		handle = alloc_handle(sock);
 	} else {
-		isc_refcount_increment0(&handle->references);
+		isc_refcount_init(&handle->references, 1);
 		INSIST(VALID_NMHANDLE(handle));
 	}
 
@@ -1099,9 +1103,11 @@ isc__nmhandle_get(isc_nmsocket_t *sock, isc_sockaddr_t *peer,
 	handle->ah_pos = pos;
 	UNLOCK(&sock->lock);
 
-	if (sock->type == isc_nm_tcpsocket) {
-		INSIST(sock->tcphandle == NULL);
-		sock->tcphandle = handle;
+	if (sock->type == isc_nm_tcpsocket ||
+	    (sock->type == isc_nm_udpsocket && atomic_load(&sock->client)))
+	{
+		INSIST(sock->statichandle == NULL);
+		sock->statichandle = handle;
 	}
 
 	return (handle);
@@ -1208,6 +1214,10 @@ isc_nmhandle_unref(isc_nmhandle_t *handle) {
 		}
 	}
 
+	if (handle == sock->statichandle) {
+		sock->statichandle = NULL;
+	}
+
 	isc__nmsocket_detach(&sock);
 }
 
@@ -1353,7 +1363,7 @@ isc_nm_cancelread(isc_nmhandle_t *handle) {
 
 	switch (handle->sock->type) {
 	case isc_nm_tcpsocket:
-		isc__nm_tcp_cancelread(handle->sock);
+		isc__nm_tcp_cancelread(handle);
 		break;
 	default:
 		INSIST(0);

lib/isc/netmgr/tcp.c

@@ -147,24 +147,27 @@ done:
 
 static void
 tcp_connect_cb(uv_connect_t *uvreq, int status) {
+	isc_result_t result;
 	isc__nm_uvreq_t *req = (isc__nm_uvreq_t *)uvreq->data;
 	isc_nmsocket_t *sock = NULL;
+	struct sockaddr_storage ss;
+	isc_nmhandle_t *handle = NULL;
 
 	sock = uv_handle_get_data((uv_handle_t *)uvreq->handle);
 
 	REQUIRE(VALID_UVREQ(req));
 
-	if (status == 0) {
-		isc_result_t result;
-		struct sockaddr_storage ss;
-		isc_nmhandle_t *handle = NULL;
+	if (status != 0) {
+		req->cb.connect(NULL, isc__nm_uverr2result(status), req->cbarg);
+		isc__nm_uvreq_put(&req, sock);
+		return;
+	}
 
 	sock = uv_handle_get_data((uv_handle_t *)uvreq->handle);
 	isc__nm_incstats(sock->mgr, sock->statsindex[STATID_CONNECT]);
 	uv_tcp_getpeername(&sock->uv_handle.tcp, (struct sockaddr *)&ss,
 			   &(int){ sizeof(ss) });
-		result = isc_sockaddr_fromsockaddr(&sock->peer,
-						   (struct sockaddr *)&ss);
+	result = isc_sockaddr_fromsockaddr(&sock->peer, (struct sockaddr *)&ss);
 	RUNTIME_CHECK(result == ISC_R_SUCCESS);
 
 	handle = isc__nmhandle_get(sock, NULL, NULL);
@@ -172,6 +175,8 @@ tcp_connect_cb(uv_connect_t *uvreq, int status) {
 
 	isc__nm_uvreq_put(&req, sock);
 
+	atomic_init(&sock->client, true);
+
 	/*
 	 * The sock is now attached to the handle.
 	 */
@@ -182,14 +187,6 @@ tcp_connect_cb(uv_connect_t *uvreq, int status) {
 	 * it needs to attach to it.
 	 */
 	isc_nmhandle_unref(handle);
-	} else {
-		/*
-		 * TODO:
-		 * Handle the connect error properly and free the socket.
-		 */
-		req->cb.connect(NULL, isc__nm_uverr2result(status), req->cbarg);
-		isc__nm_uvreq_put(&req, sock);
-	}
 }
 
 isc_result_t
@@ -201,6 +198,8 @@ isc_nm_tcpconnect(isc_nm_t *mgr, isc_nmiface_t *local, isc_nmiface_t *peer,
 	isc_result_t result = ISC_R_SUCCESS;
 
 	REQUIRE(VALID_NM(mgr));
+	REQUIRE(local != NULL);
+	REQUIRE(peer != NULL);
 
 	nsock = isc_mem_get(mgr->mctx, sizeof(*nsock));
 	isc__nmsocket_init(nsock, mgr, isc_nm_tcpsocket, local);
@@ -211,6 +210,7 @@ isc_nm_tcpconnect(isc_nm_t *mgr, isc_nmiface_t *local, isc_nmiface_t *peer,
 	req->cb.connect = cb;
 	req->cbarg = cbarg;
 	req->peer = peer->addr;
+	req->local = local->addr;
 
 	ievent = isc__nm_get_ievent(mgr, netievent_tcpconnect);
 	ievent->sock = nsock;
@@ -604,7 +604,7 @@ readtimeout_cb(uv_timer_t *handle) {
 		isc_quota_detach(&sock->quota);
 	}
 	if (sock->rcb.recv != NULL) {
-		sock->rcb.recv(sock->tcphandle, ISC_R_TIMEDOUT, NULL,
+		sock->rcb.recv(sock->statichandle, ISC_R_TIMEDOUT, NULL,
 			       sock->rcbarg);
 		isc__nmsocket_clearcb(sock);
 	}
@@ -766,8 +766,8 @@ read_cb(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) {
 					.length = nread };
 
 		if (sock->rcb.recv != NULL) {
-			sock->rcb.recv(sock->tcphandle, ISC_R_SUCCESS, &region,
-				       sock->rcbarg);
+			sock->rcb.recv(sock->statichandle, ISC_R_SUCCESS,
+				       &region, sock->rcbarg);
 		}
 
 		sock->read_timeout = (atomic_load(&sock->keepalive)
@@ -792,7 +792,8 @@ read_cb(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) {
 	 */
 	if (sock->rcb.recv != NULL) {
 		isc__nm_incstats(sock->mgr, sock->statsindex[STATID_RECVFAIL]);
-		sock->rcb.recv(sock->tcphandle, ISC_R_EOF, NULL, sock->rcbarg);
+		sock->rcb.recv(sock->statichandle, ISC_R_EOF, NULL,
+			       sock->rcbarg);
 		isc__nmsocket_clearcb(sock);
 	}
 
@@ -1125,24 +1126,27 @@ void
 isc__nm_tcp_shutdown(isc_nmsocket_t *sock) {
 	REQUIRE(VALID_NMSOCK(sock));
 
-	if (sock->type == isc_nm_tcpsocket && sock->tcphandle != NULL &&
+	if (sock->type == isc_nm_tcpsocket && sock->statichandle != NULL &&
 	    sock->rcb.recv != NULL)
 	{
-		sock->rcb.recv(sock->tcphandle, ISC_R_CANCELED, NULL,
+		sock->rcb.recv(sock->statichandle, ISC_R_CANCELED, NULL,
 			       sock->rcbarg);
 		isc__nmsocket_clearcb(sock);
 	}
 }
 
 void
-isc__nm_tcp_cancelread(isc_nmsocket_t *sock) {
-	REQUIRE(VALID_NMSOCK(sock));
+isc__nm_tcp_cancelread(isc_nmhandle_t *handle) {
+	isc_nmsocket_t *sock = NULL;
 
-	if (sock->type == isc_nm_tcpsocket && sock->tcphandle != NULL &&
-	    sock->rcb.recv != NULL)
-	{
-		sock->rcb.recv(sock->tcphandle, ISC_R_CANCELED, NULL,
-			       sock->rcbarg);
+	REQUIRE(VALID_NMHANDLE(handle));
+
+	sock = handle->sock;
+
+	REQUIRE(sock->type == isc_nm_tcpsocket);
+
+	if (atomic_load(&sock->client) && sock->rcb.recv != NULL) {
+		sock->rcb.recv(handle, ISC_R_EOF, NULL, sock->rcbarg);
 		isc__nmsocket_clearcb(sock);
 	}
 }

lib/isc/netmgr/tcpdns.c

@@ -82,7 +82,9 @@ alloc_dnsbuf(isc_nmsocket_t *sock, size_t len) {
 static void
 timer_close_cb(uv_handle_t *handle) {
 	isc_nmsocket_t *sock = (isc_nmsocket_t *)uv_handle_get_data(handle);
-	INSIST(VALID_NMSOCK(sock));
+
+	REQUIRE(VALID_NMSOCK(sock));
+
 	atomic_store(&sock->closed, true);
 	tcpdns_close_direct(sock);
 }
@@ -94,7 +96,8 @@ dnstcp_readtimeout(uv_timer_t *timer) {
 
 	REQUIRE(VALID_NMSOCK(sock));
 	REQUIRE(sock->tid == isc_nm_tid());
-	/* Close the TCP connection, it's closing should fire 'our' closing */
+
+	/* Close the TCP connection; its closure should fire ours. */
 	isc_nmhandle_unref(sock->outerhandle);
 	sock->outerhandle = NULL;
 }
@@ -187,8 +190,15 @@ processbuffer(isc_nmsocket_t *dnssock, isc_nmhandle_t **handlep) {
 	 */
 	len = dnslen(dnssock->buf);
 	if (len <= dnssock->buf_len - 2) {
-		isc_nmhandle_t *dnshandle = isc__nmhandle_get(dnssock, NULL,
-							      NULL);
+		isc_nmhandle_t *dnshandle;
+		if (atomic_load(&dnssock->client) &&
+		    dnssock->statichandle != NULL) {
+			dnshandle = dnssock->statichandle;
+			isc_nmhandle_ref(dnshandle);
+		} else {
+			dnshandle = isc__nmhandle_get(dnssock, NULL, NULL);
+		}
+
 		isc_nmsocket_t *listener = dnssock->listener;
 
 		if (listener != NULL && listener->rcb.recv != NULL) {
@@ -197,6 +207,20 @@ processbuffer(isc_nmsocket_t *dnssock, isc_nmhandle_t **handlep) {
 				&(isc_region_t){ .base = dnssock->buf + 2,
 						 .length = len },
 				listener->rcbarg);
+		} else if (dnssock->rcb.recv != NULL) {
+			isc_nm_recv_cb_t cb = dnssock->rcb.recv;
+			void *cbarg = dnssock->rcbarg;
+
+			/*
+			 * We need to clear the read callback *before*
+			 * calling it, because it might make another
+			 * call to isc_nm_read() and set up a new callback.
+			 */
+			isc__nmsocket_clearcb(dnssock);
+			cb(dnshandle, ISC_R_SUCCESS,
+			   &(isc_region_t){ .base = dnssock->buf + 2,
+					    .length = len },
+			   cbarg);
 		}
 
 		len += 2;
@@ -227,11 +251,12 @@ dnslisten_readcb(isc_nmhandle_t *handle, isc_result_t eresult,
 
 	REQUIRE(VALID_NMSOCK(dnssock));
 	REQUIRE(VALID_NMHANDLE(handle));
-	REQUIRE(dnssock->tid == isc_nm_tid());
 
 	if (region == NULL || eresult != ISC_R_SUCCESS) {
 		/* Connection closed */
+		if (eresult != ISC_R_CANCELED) {
 			isc_nmhandle_unref(handle);
+		}
 		dnssock->result = eresult;
 		if (dnssock->self != NULL) {
 			isc__nmsocket_detach(&dnssock->self);
@@ -277,11 +302,14 @@ dnslisten_readcb(isc_nmhandle_t *handle, isc_result_t eresult,
 			uv_timer_stop(&dnssock->timer);
 		}
 
-		if (atomic_load(&dnssock->sequential)) {
+		if (atomic_load(&dnssock->sequential) ||
+		    dnssock->rcb.recv == NULL) {
 			/*
-			 * We're in sequential mode and we processed
-			 * one packet, so we're done until the next read
-			 * completes.
+			 * Two reasons we might want to pause here:
+			 * - If we're in sequential mode and we've received
+			 *   a whole packet, so we're done until it's been
+			 *   processed;
+			 * - If we no longer have a read callback.
 			 */
 			isc_nm_pauseread(dnssock->outerhandle);
 			done = true;
@@ -314,7 +342,6 @@ isc_nm_listentcpdns(isc_nm_t *mgr, isc_nmiface_t *iface, isc_nm_recv_cb_t cb,
 		    void *cbarg, isc_nm_accept_cb_t accept_cb,
 		    void *accept_cbarg, size_t extrahandlesize, int backlog,
 		    isc_quota_t *quota, isc_nmsocket_t **sockp) {
-	/* A 'wrapper' socket object with outer set to true TCP socket */
 	isc_nmsocket_t *dnslistensock = isc_mem_get(mgr->mctx,
 						    sizeof(*dnslistensock));
 	isc_result_t result;
@@ -328,7 +355,11 @@ isc_nm_listentcpdns(isc_nm_t *mgr, isc_nmiface_t *iface, isc_nm_recv_cb_t cb,
 	dnslistensock->accept_cbarg = accept_cbarg;
 	dnslistensock->extrahandlesize = extrahandlesize;
 
-	/* We set dnslistensock->outer to a true listening socket */
+	/*
+	 * dnslistensock will be a DNS 'wrapper' around a connected
+	 * stream. We set dnslistensock->outer to a socket listening
+	 * for a TCP connection.
+	 */
 	result = isc_nm_listentcp(mgr, iface, dnslisten_acceptcb, dnslistensock,
 				  extrahandlesize, backlog, quota,
 				  &dnslistensock->outer);
@@ -495,8 +526,7 @@ isc__nm_async_tcpdnssend(isc__networker_t *worker, isc__netievent_t *ev0) {
 
 		r.base = (unsigned char *)req->uvbuf.base;
 		r.length = req->uvbuf.len;
-		result = isc__nm_tcp_send(sock->outerhandle, &r, tcpdnssend_cb,
-					  req);
+		result = isc_nm_send(sock->outerhandle, &r, tcpdnssend_cb, req);
 	}
 
 	if (result != ISC_R_SUCCESS) {
@@ -538,7 +568,7 @@ isc__nm_tcpdns_send(isc_nmhandle_t *handle, isc_region_t *region,
 		r.base = (unsigned char *)uvreq->uvbuf.base;
 		r.length = uvreq->uvbuf.len;
 
-		return (isc__nm_tcp_send(sock->outerhandle, &r, tcpdnssend_cb,
+		return (isc_nm_send(sock->outerhandle, &r, tcpdnssend_cb,
 				    uvreq));
 	} else {
 		isc__netievent_tcpdnssend_t *ievent = NULL;

lib/isc/netmgr/udp.c

@@ -80,7 +80,7 @@ isc_nm_listenudp(isc_nm_t *mgr, isc_nmiface_t *iface, isc_nm_recv_cb_t cb,
 		csock->rcb.recv = cb;
 		csock->rcbarg = cbarg;
 		csock->fd = socket(family, SOCK_DGRAM, 0);
-		INSIST(csock->fd >= 0);
+		RUNTIME_CHECK(csock->fd >= 0);
 
 		/*
 		 * This is SO_REUSE**** hell:
@@ -223,7 +223,7 @@ isc__nm_async_udplisten(isc__networker_t *worker, isc__netievent_t *ev0) {
 }
 
 static void
-udp_close_cb(uv_handle_t *handle) {
+udp_stop_cb(uv_handle_t *handle) {
 	isc_nmsocket_t *sock = uv_handle_get_data(handle);
 	atomic_store(&sock->closed, true);
 
@@ -236,7 +236,7 @@ stop_udp_child(isc_nmsocket_t *sock) {
 	REQUIRE(sock->tid == isc_nm_tid());
 
 	uv_udp_recv_stop(&sock->uv_handle.udp);
-	uv_close((uv_handle_t *)&sock->uv_handle.udp, udp_close_cb);
+	uv_close((uv_handle_t *)&sock->uv_handle.udp, udp_stop_cb);
 
 	isc__nm_incstats(sock->mgr, sock->statsindex[STATID_CLOSE]);
 
@@ -395,7 +395,11 @@ udp_recv_cb(uv_udp_t *handle, ssize_t nrecv, const uv_buf_t *buf,
 
 	result = isc_sockaddr_fromsockaddr(&sockaddr, addr);
 	RUNTIME_CHECK(result == ISC_R_SUCCESS);
+	if (!atomic_load(&sock->connected)) {
 		nmhandle = isc__nmhandle_get(sock, &sockaddr, NULL);
+	} else {
+		nmhandle = sock->statichandle;
+	}
 	region.base = (unsigned char *)buf->base;
 	region.length = nrecv;
 
@@ -425,13 +429,13 @@ udp_recv_cb(uv_udp_t *handle, ssize_t nrecv, const uv_buf_t *buf,
 isc_result_t
 isc__nm_udp_send(isc_nmhandle_t *handle, isc_region_t *region, isc_nm_cb_t cb,
 		 void *cbarg) {
-	isc_nmsocket_t *psock = NULL, *rsock = NULL;
 	isc_nmsocket_t *sock = handle->sock;
+	isc_nmsocket_t *psock = NULL, *rsock = sock;
 	isc_sockaddr_t *peer = &handle->peer;
 	isc__netievent_udpsend_t *ievent = NULL;
 	isc__nm_uvreq_t *uvreq = NULL;
-	int ntid;
 	uint32_t maxudp = atomic_load(&sock->mgr->maxudp);
+	int ntid;
 
 	/*
 	 * We're simulating a firewall blocking UDP packets bigger than
@@ -446,12 +450,12 @@ isc__nm_udp_send(isc_nmhandle_t *handle, isc_region_t *region, isc_nm_cb_t cb,
 		return (ISC_R_SUCCESS);
 	}
 
-	if (sock->type == isc_nm_udpsocket) {
+	if (sock->type == isc_nm_udpsocket && !atomic_load(&sock->client)) {
 		INSIST(sock->parent != NULL);
 		psock = sock->parent;
 	} else if (sock->type == isc_nm_udplistener) {
 		psock = sock;
-	} else {
+	} else if (!atomic_load(&sock->client)) {
 		INSIST(0);
 		ISC_UNREACHABLE();
 	}
@@ -467,13 +471,16 @@ isc__nm_udp_send(isc_nmhandle_t *handle, isc_region_t *region, isc_nm_cb_t cb,
 	 */
 	if (isc__nm_in_netthread()) {
 		ntid = isc_nm_tid();
-	} else if (sock->type == isc_nm_udpsocket) {
+	} else if (sock->type == isc_nm_udpsocket &&
+		   !atomic_load(&sock->client)) {
 		ntid = sock->tid;
 	} else {
 		ntid = (int)isc_random_uniform(sock->nchildren);
 	}
 
+	if (psock != NULL) {
 		rsock = &psock->children[ntid];
+	}
 
 	uvreq = isc__nm_uvreq_get(sock->mgr, sock);
 	uvreq->uvbuf.base = (char *)region->base;
@@ -553,6 +560,7 @@ udp_send_cb(uv_udp_send_t *req, int status) {
 static isc_result_t
 udp_send_direct(isc_nmsocket_t *sock, isc__nm_uvreq_t *req,
 		isc_sockaddr_t *peer) {
+	const struct sockaddr *sa = NULL;
 	int rv;
 
 	REQUIRE(sock->tid == isc_nm_tid());
@@ -561,9 +569,11 @@ udp_send_direct(isc_nmsocket_t *sock, isc__nm_uvreq_t *req,
 	if (!isc__nmsocket_active(sock)) {
 		return (ISC_R_CANCELED);
 	}
+
 	isc_nmhandle_ref(req->handle);
+	sa = atomic_load(&sock->connected) ? NULL : &peer->type.sa;
 	rv = uv_udp_send(&req->uv_req.udp_send, &sock->uv_handle.udp,
-			 &req->uvbuf, 1, &peer->type.sa, udp_send_cb);
+			 &req->uvbuf, 1, sa, udp_send_cb);
 	if (rv < 0) {
 		isc__nm_incstats(req->sock->mgr,
 				 req->sock->statsindex[STATID_SENDFAIL]);