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conf, udp: Drop mostly duplicated dns_send arrays, rename related fields

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Given that we use just the first valid DNS resolver address
configured, or read from resolv.conf(5) on the host, to forward DNS
queries to, in case --dns-forward is used, we don't need to duplicate
dns[] to dns_send[]:

- rename dns_send[] back to dns[]: those are the resolvers we
  advertise to the guest/container

- for forwarding purposes, instead of dns[], use a single field (for
  each protocol version): dns_host

- and rename dns_fwd to dns_match, so that it's clear this is the
  address we are matching DNS queries against, to decide if they need
  to be forwarded

Suggested-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2022-11-10 20:30:03 +01:00
parent 4129764eca
commit 3a2afde87d
6 changed files with 62 additions and 71 deletions

5
dhcp.c
View file

@ -359,9 +359,8 @@ int dhcp(const struct ctx *c, const struct pool *p)
}
for (i = 0, opts[6].slen = 0;
!c->no_dhcp_dns && !IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns_send[i]);
i++) {
((struct in_addr *)opts[6].s)[i] = c->ip4.dns_send[i];
!c->no_dhcp_dns && !IN4_IS_ADDR_UNSPECIFIED(&c->ip4.dns[i]); i++) {
((struct in_addr *)opts[6].s)[i] = c->ip4.dns[i];
opts[6].slen += sizeof(uint32_t);
}