34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
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From d6c69f6bdba8e2a138faa6c422f5fd29545f1f06 Mon Sep 17 00:00:00 2001
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From: Simon Kelley <simon@thekelleys.org.uk>
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Date: Tue, 6 Sep 2022 15:35:54 +0100
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Subject: [PATCH] Free sockets awaiting upstream DNS replies ASAP.
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Once we have a good answer, close the socket so that the fd can
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be reused during DNSSEC validation and we don't have to read and
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discard more replies from other servers.
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---
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src/forward.c | 7 +++++++
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1 file changed, 7 insertions(+)
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diff --git a/src/forward.c b/src/forward.c
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index e8249a6..f90be2f 100644
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--- a/src/forward.c
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+++ b/src/forward.c
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@@ -1144,6 +1144,13 @@ void reply_query(int fd, time_t now)
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}
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forward->sentto = server;
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+
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+ /* We have a good answer, and will now validate it or return it.
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+ It may be some time before this the validation completes, but we don't need
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+ any more answers, so close the socket(s) on which we were expecting
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+ answers, to conserve file descriptors, and to save work reading and
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+ discarding answers for other upstreams. */
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+ free_rfds(&forward->rfds);
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#ifdef HAVE_DNSSEC
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if ((forward->sentto->flags & SERV_DO_DNSSEC) &&
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--
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2.25.1
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