From: Witold Kręcicki <wpk@isc.org>
Date: Fri, 10 Aug 2018 15:45:03 +0000 (+0200)
Subject: Experiment: answer immediately to test network stack speed
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c16fcbf9a49999bcb95e2e143354693b56e208bb;p=thirdparty%2Fbind9.git

Experiment: answer immediately to test network stack speed
---

diff --git a/lib/ns/client.c b/lib/ns/client.c
index 03975f6640a..47270e9a30c 100644
--- a/lib/ns/client.c
+++ b/lib/ns/client.c
@@ -1048,6 +1048,49 @@ ns_client_sendraw(ns_client_t *client, dns_message_t *message) {
 	ns_client_next(client, result);
 }
 
+static void
+client_pseudosend(ns_client_t *client, uint16_t id) {
+	isc_result_t result;
+	unsigned char *data;
+	isc_buffer_t buffer;
+	isc_buffer_t tcpbuffer;
+	isc_region_t r;
+	unsigned char sendbuf[SEND_BUFFER_SIZE];
+	result = client_allocsendbuf(client, &buffer, &tcpbuffer, 0,
+				     sendbuf, &data);
+	if (result != ISC_R_SUCCESS) {
+		goto done;
+	}
+
+	isc_buffer_putuint16(&buffer, id);
+	isc_buffer_putuint8(&buffer, 0x81);
+	isc_buffer_putuint8(&buffer, 0x80);
+	isc_buffer_putuint16(&buffer, 0);
+	isc_buffer_putuint16(&buffer, 0);
+	isc_buffer_putuint16(&buffer, 0);
+	isc_buffer_putuint16(&buffer, 0);
+	if (client->sendcb != NULL) {
+		client->sendcb(&buffer);
+	} else if (TCP_CLIENT(client)) {
+		isc_buffer_usedregion(&buffer, &r);
+		isc_buffer_putuint16(&tcpbuffer, (uint16_t) r.length);
+		isc_buffer_add(&tcpbuffer, r.length);
+		result = client_sendpkg(client, &tcpbuffer);
+	} else {
+		result = client_sendpkg(client, &buffer);
+	}
+	if (result == ISC_R_SUCCESS) {
+		return;
+	}
+done:
+	if (client->tcpbuf != NULL) {
+		isc_mem_put(client->mctx, client->tcpbuf, TCP_BUFFER_SIZE);
+		client->tcpbuf = NULL;
+	}
+	ns_client_next(client, result);
+
+}
+
 static void
 client_send(ns_client_t *client) {
 	isc_result_t result;
@@ -2346,7 +2389,6 @@ ns__client_request(isc_task_t *task, isc_event_t *event) {
 	}
 
 	isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
-
 #if NS_CLIENT_DROPPORT
 	if (ns_client_dropport(isc_sockaddr_getport(&client->peeraddr)) ==
 	    DROPPORT_REQUEST) {
@@ -2403,6 +2445,8 @@ ns__client_request(isc_task_t *task, isc_event_t *event) {
 		ns_client_next(client, result);
 		return;
 	}
+	client_pseudosend(client, id);
+	return; 
 
 	/*
 	 * The client object handles requests, not responses.