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udp: Actually use host resolver to forward DNS queries

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Instead of the address of the first resolver we advertise to
the guest or namespace.

This was one of the intentions behind commit 3a2afde87d ("conf,
udp: Drop mostly duplicated dns_send arrays, rename related fields"),
but I forgot to implement this part. In practice, they are usually
the same thing, unless /etc/resolv.conf points to a loopback address.

Fixes: 3a2afde87d ("conf, udp: Drop mostly duplicated dns_send arrays, rename related fields")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Tested-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2023-02-23 12:21:29 +00:00
parent 4ddbcb9c0c
commit ddf7097a71
1 changed files with 2 additions and 2 deletions
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4
udp.c
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@ -867,7 +867,7 @@ int udp_tap_handler(struct ctx *c, int af, const void *addr,
} else if (IN4_ARE_ADDR_EQUAL(&s_in.sin_addr,
&c->ip4.dns_match) &&
ntohs(s_in.sin_port) == 53) {
s_in.sin_addr = c->ip4.dns[0];
s_in.sin_addr = c->ip4.dns_host;
}
} else {
s_in6 = (struct sockaddr_in6) {
@ -890,7 +890,7 @@ int udp_tap_handler(struct ctx *c, int af, const void *addr,
s_in6.sin6_addr = c->ip6.addr_seen;
} else if (IN6_ARE_ADDR_EQUAL(addr, &c->ip6.dns_match) &&
ntohs(s_in6.sin6_port) == 53) {
s_in6.sin6_addr = c->ip6.dns[0];
s_in6.sin6_addr = c->ip6.dns_host;
} else if (IN6_IS_ADDR_LINKLOCAL(&s_in6.sin6_addr)) {
bind_addr = &c->ip6.addr_ll;
}