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Retry SERVFAIL DNSSEC queries to a different server, if possible.

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This commit is contained in:
Simon Kelley
2018-05-11 16:44:16 +01:00
parent a0088e8364
commit 1f60a18ea1
1 changed files with 42 additions and 11 deletions
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53
src/forward.c
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@@ -825,9 +825,12 @@ void reply_query(int fd, int family, time_t now)
size_t plen;
int is_sign;
#ifdef HAVE_DNSSEC
/* For DNSSEC originated queries, just retry the query to the same server. */
if (forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY))
{
struct server *start;
blockdata_retrieve(forward->stash, forward->stash_len, (void *)header);
plen = forward->stash_len;
@@ -839,26 +842,54 @@ void reply_query(int fd, int family, time_t now)
else
log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, "retry", (struct all_addr *)&forward->sentto->addr.in6.sin6_addr, "dnssec");
#endif
if (forward->sentto->sfd)
fd = forward->sentto->sfd->fd;
start = forward->sentto;
/* for non-domain specific servers, see if we can find another to try. */
if ((forward->sentto->flags & SERV_TYPE) == 0)
while (1)
{
if (!(start = start->next))
start = daemon->servers;
if (start == forward->sentto)
break;
if ((start->flags & SERV_TYPE) == 0 &&
(start->flags & SERV_DO_DNSSEC))
break;
}
if (start->sfd)
fd = start->sfd->fd;
else
{
#ifdef HAVE_IPV6
if (forward->sentto->addr.sa.sa_family == AF_INET6)
fd = forward->rfd6->fd;
if (start->addr.sa.sa_family == AF_INET6)
{
/* may have changed family */
if (!forward->rfd6)
forward->rfd6 = allocate_rfd(AF_INET6);
fd = forward->rfd6->fd;
}
else
#endif
fd = forward->rfd4->fd;
{
/* may have changed family */
if (!forward->rfd4)
forward->rfd4 = allocate_rfd(AF_INET);
fd = forward->rfd4->fd;
}
}
while (retry_send(sendto(fd, (char *)header, plen, 0,
&forward->sentto->addr.sa,
sa_len(&forward->sentto->addr))));
&start->addr.sa,
sa_len(&start->addr))));
return;
}
#endif
/* In strict order mode, there must be a server later in the chain
left to send to, otherwise without the forwardall mechanism,
code further on will cycle around the list forwever if they
@@ -1024,7 +1055,7 @@ void reply_query(int fd, int family, time_t now)
while (1)
{
if (type == (start->flags & (SERV_TYPE | SERV_DO_DNSSEC)) &&
(type != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) &&
((type & SERV_TYPE) != SERV_HAS_DOMAIN || hostname_isequal(domain, start->domain)) &&
!(start->flags & (SERV_LITERAL_ADDRESS | SERV_LOOP)))
{
new_server = start;