package/network/services/dnsmasq/patches/0004-Don-t-forward-.bind-.server-queries-upstream.patch

   1 From cf5984367bc6a949e3803a576512c5a7bc48ebab Mon Sep 17 00:00:00 2001
   2 From: Vladislav Grishenko <themiron@mail.ru>
   3 Date: Thu, 18 Oct 2018 04:55:21 +0500
   4 Subject: [PATCH 04/32] Don't forward *.bind/*.server queries upstream
   5
   6 Chaos .bind and .server (RFC4892) zones are local, therefore
   7 don't forward queries upstream to avoid mixing with supported
   8 locally and false replies with NO_ID enabled.
   9
  10 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
  11 ---
  12  src/rfc1035.c | 15 ++++++++++++++-
  13  1 file changed, 14 insertions(+), 1 deletion(-)
  14
  15 --- a/src/rfc1035.c
  16 +++ b/src/rfc1035.c
  17 @@ -1276,7 +1276,7 @@ size_t answer_request(struct dns_header
  18    int q, ans, anscount = 0, addncount = 0;
  19    int dryrun = 0;
  20    struct crec *crecp;
  21 -  int nxdomain = 0, auth = 1, trunc = 0, sec_data = 1;
  22 +  int nxdomain = 0, notimp = 0, auth = 1, trunc = 0, sec_data = 1;
  23    struct mx_srv_record *rec;
  24    size_t len;
  25
  26 @@ -1355,6 +1355,17 @@ size_t answer_request(struct dns_header
  27             }
  28         }
  29
  30 +      if (qclass == C_CHAOS)
  31 +       {
  32 +         /* don't forward *.bind and *.server chaos queries */
  33 +         if (hostname_issubdomain("bind", name) || hostname_issubdomain("server", name))
  34 +           {
  35 +             if (!ans)
  36 +               notimp = 1, auth = 0;
  37 +             ans = 1;
  38 +           }
  39 +       }
  40 +
  41        if (qclass == C_IN)
  42         {
  43           struct txt_record *t;
  44 @@ -1903,6 +1914,8 @@ size_t answer_request(struct dns_header
  45
  46    if (nxdomain)
  47      SET_RCODE(header, NXDOMAIN);
  48 +  else if (notimp)
  49 +    SET_RCODE(header, NOTIMP);
  50    else
  51      SET_RCODE(header, NOERROR); /* no error */
  52    header->ancount = htons(anscount);