package/network/services/dnsmasq/patches/020-Try-other-servers-if-first-returns-REFUSED-when-stri.patch

   1 From 9396752c115b3ab733fa476b30da73237e12e7ba Mon Sep 17 00:00:00 2001
   2 From: Hans Dedecker <dedeckeh@gmail.com>
   3 Date: Tue, 27 Jun 2017 22:08:47 +0100
   4 Subject: [PATCH] Try other servers if first returns REFUSED when
   5  --strict-order active.
   6
   7 If a DNS server replies REFUSED for a given DNS query in strict order mode
   8 no failover to the next DNS server is triggered as the failover logic only
   9 covers non strict mode.
  10 As a result the client will be returned the REFUSED reply without first
  11 falling back to the secondary DNS server(s).
  12
  13 Make failover support work as well for strict mode config in case REFUSED is
  14 replied by deleting the strict order check and rely only on forwardall being
  15 equal to 0 which is the case in non strict mode when a single server has been
  16 contacted or when strict order mode has been configured.
  17 ---
  18  CHANGELOG     | 4 ++++
  19  src/forward.c | 1 -
  20  2 files changed, 4 insertions(+), 1 deletion(-)
  21
  22 --- a/src/forward.c
  23 +++ b/src/forward.c
  24 @@ -790,7 +790,6 @@ void reply_query(int fd, int family, tim
  25    /* Note: if we send extra options in the EDNS0 header, we can't recreate
  26       the query from the reply. */
  27    if (RCODE(header) == REFUSED &&
  28 -      !option_bool(OPT_ORDER) &&
  29        forward->forwardall == 0 &&
  30        !(forward->flags & FREC_HAS_EXTRADATA))
  31      /* for broken servers, attempt to send to another one. */