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From 0dfc25b917f7e94ac56ea4285a5d394305787b06 Mon Sep 17 00:00:00 2001
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From: Stefano Brivio <sbrivio@redhat.com>
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Date: Thu, 23 Feb 2023 12:21:29 +0000
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Subject: [PATCH 01/20] udp: Actually use host resolver to forward DNS queries
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Instead of the address of the first resolver we advertise to
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the guest or namespace.
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This was one of the intentions behind commit 3a2afde87dd1 ("conf,
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udp: Drop mostly duplicated dns_send arrays, rename related fields"),
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but I forgot to implement this part. In practice, they are usually
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the same thing, unless /etc/resolv.conf points to a loopback address.
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Fixes: 3a2afde87dd1 ("conf, udp: Drop mostly duplicated dns_send arrays, rename related fields")
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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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Tested-by: Andrea Bolognani <abologna@redhat.com>
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Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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(cherry picked from commit ddf7097a718095e879428667f2d56ec7d4f027e5)
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---
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udp.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/udp.c b/udp.c
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index c913d27..1d65559 100644
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--- a/udp.c
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+++ b/udp.c
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@@ -867,7 +867,7 @@ int udp_tap_handler(struct ctx *c, int af, const void *addr,
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} else if (IN4_ARE_ADDR_EQUAL(&s_in.sin_addr,
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&c->ip4.dns_match) &&
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ntohs(s_in.sin_port) == 53) {
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- s_in.sin_addr = c->ip4.dns[0];
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+ s_in.sin_addr = c->ip4.dns_host;
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}
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} else {
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s_in6 = (struct sockaddr_in6) {
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@@ -890,7 +890,7 @@ int udp_tap_handler(struct ctx *c, int af, const void *addr,
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s_in6.sin6_addr = c->ip6.addr_seen;
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} else if (IN6_ARE_ADDR_EQUAL(addr, &c->ip6.dns_match) &&
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ntohs(s_in6.sin6_port) == 53) {
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- s_in6.sin6_addr = c->ip6.dns[0];
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+ s_in6.sin6_addr = c->ip6.dns_host;
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} else if (IN6_IS_ADDR_LINKLOCAL(&s_in6.sin6_addr)) {
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bind_addr = &c->ip6.addr_ll;
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}
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--
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2.39.2
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