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Don't do retries over UDP when we've sent the query by TCP.

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This commit is contained in:
Simon Kelley
2025-01-12 22:02:05 +00:00
parent 509afcd1d2
commit 7d915a0bb9
1 changed files with 18 additions and 15 deletions
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31
src/forward.c
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@@ -163,10 +163,10 @@ static int domain_no_rebind(char *domain)
return 0;
}
static int forward_query(int udpfd, union mysockaddr *udpaddr,
union all_addr *dst_addr, unsigned int dst_iface,
struct dns_header *header, size_t plen, size_t replylimit, time_t now,
struct frec *forward, unsigned int fwd_flags, int fast_retry)
static void forward_query(int udpfd, union mysockaddr *udpaddr,
union all_addr *dst_addr, unsigned int dst_iface,
struct dns_header *header, size_t plen, size_t replylimit, time_t now,
struct frec *forward, unsigned int fwd_flags, int fast_retry)
{
unsigned int flags = 0;
int is_dnssec = forward && (forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY));
@@ -254,7 +254,7 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
it's safe to wait for the reply from the first without
forwarding the second. */
if (difftime(now, forward->time) < 2)
return 0;
return;
}
/* use our id when resending */
@@ -376,6 +376,10 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
if (forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY))
{
/* Don't retry if we've already sent it via TCP. */
if (forward->flags & FREC_GONE_TO_TCP)
return;
/* log_id should match previous DNSSEC query. */
daemon->log_display_id = forward->frec_src.log_id;
@@ -386,7 +390,7 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
/* Find suitable servers: should never fail. */
if (!filter_servers(forward->sentto->arrayposn, F_DNSSECOK, &first, &last))
return 0;
return;
is_dnssec = 1;
forward->forwardall = 1;
@@ -502,8 +506,9 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
if (forwarded || is_dnssec)
{
daemon->metrics[METRIC_DNS_QUERIES_FORWARDED]++;
forward->forward_timestamp = dnsmasq_milliseconds();
return 1;
return;
}
/* could not send on, prepare to return */
@@ -515,7 +520,7 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
if (udpfd != -1)
{
if (!(plen = make_local_answer(flags, gotname, plen, header, daemon->namebuff, (char *)(header + replylimit), first, last, ede)))
return 0;
return;
if (fwd_flags & FREC_HAS_PHEADER)
{
@@ -543,7 +548,8 @@ static int forward_query(int udpfd, union mysockaddr *udpaddr,
send_from(udpfd, option_bool(OPT_NOWILD) || option_bool(OPT_CLEVERBIND), (char *)header, plen, udpaddr, dst_addr, dst_iface);
}
return 0;
daemon->metrics[METRIC_DNS_LOCAL_ANSWERED]++;
return;
}
/* Check if any frecs need to do a retry, and action that if so.
@@ -1851,11 +1857,8 @@ void receive_query(struct listener *listen, time_t now)
blockdata_free(saved_question);
saved_question = NULL;
if (forward_query(fd, &source_addr, &dst_addr, if_index, header, (size_t)n,
udp_size, now, NULL, fwd_flags, 0))
daemon->metrics[METRIC_DNS_QUERIES_FORWARDED]++;
else
daemon->metrics[METRIC_DNS_LOCAL_ANSWERED]++;
forward_query(fd, &source_addr, &dst_addr, if_index, header, (size_t)n,
udp_size, now, NULL, fwd_flags, 0);
}
blockdata_free(saved_question);