2 files changed, 0 insertions, 121 deletions
diff --git a/external/unbound b/external/unbound
new file mode 160000
+Subproject 193bdc4ee3fe2b0d17e547e86512528c2614483
diff --git a/external/unbound/util/rtt.c b/external/unbound/util/rtt.c
deleted file mode 100644
index 5d86f1337..000000000
--- a/external/unbound/util/rtt.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * util/rtt.c - UDP round trip time estimator for resend timeouts.
- *
- * Copyright (c) 2007, NLnet Labs. All rights reserved.
- *
- * This software is open source.
- * 
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 
- * Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 
- * Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 
- * Neither the name of the NLNET LABS nor the names of its contributors may
- * be used to endorse or promote products derived from this software without
- * specific prior written permission.
- * 
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
- * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/**
- * \file
- *
- * This file contains a data type and functions to help estimate good
- * round trip times for UDP resend timeout values.
- */
-#include "config.h"
-#include "util/rtt.h"
-
-/* overwritten by config: infra_cache_min_rtt: */
-int RTT_MIN_TIMEOUT = 50;
-/** calculate RTO from rtt information */
-static int
-calc_rto(const struct rtt_info* rtt)
-{
-	/* From Stevens, Unix Network Programming, Vol1, 3rd ed., p.598 */
-	int rto = rtt->srtt + 4*rtt->rttvar;
-	if(rto < RTT_MIN_TIMEOUT)
-		rto = RTT_MIN_TIMEOUT;
-	if(rto > RTT_MAX_TIMEOUT)
-		rto = RTT_MAX_TIMEOUT;
-	return rto;
-}
-
-void 
-rtt_init(struct rtt_info* rtt)
-{
-	rtt->srtt = 0;
-	rtt->rttvar = 94;
-	rtt->rto = calc_rto(rtt);
-	/* default value from the book is 0 + 4*0.75 = 3 seconds */
-	/* first RTO is 0 + 4*0.094 = 0.376 seconds */
-}
-
-int 
-rtt_timeout(const struct rtt_info* rtt)
-{
-	return rtt->rto;
-}
-
-int 
-rtt_unclamped(const struct rtt_info* rtt)
-{
-	if(calc_rto(rtt) != rtt->rto) {
-		/* timeout fallback has happened */
-		return rtt->rto;
-	}
-	/* return unclamped value */
-	return rtt->srtt + 4*rtt->rttvar;
-}
-
-void 
-rtt_update(struct rtt_info* rtt, int ms)
-{
-	int delta = ms - rtt->srtt;
-	rtt->srtt += delta / 8; /* g = 1/8 */
-	if(delta < 0)
-		delta = -delta; /* |delta| */
-	rtt->rttvar += (delta - rtt->rttvar) / 4; /* h = 1/4 */
-	rtt->rto = calc_rto(rtt);
-}
-
-void 
-rtt_lost(struct rtt_info* rtt, int orig)
-{
-	/* exponential backoff */
-
-	/* if a query succeeded and put down the rto meanwhile, ignore this */
-	if(rtt->rto < orig)
-		return;
-
-	/* the original rto is doubled, not the current one to make sure
-	 * that the values in the cache are not increased by lots of
-	 * queries simultaneously as they time out at the same time */
-	orig *= 2;
-	if(rtt->rto <= orig) {
-		rtt->rto = orig;
-		if(rtt->rto > RTT_MAX_TIMEOUT)
-			rtt->rto = RTT_MAX_TIMEOUT;
-	}
-}
-
-int rtt_notimeout(const struct rtt_info* rtt)
-{
-	return calc_rto(rtt);
-}