git.openwrt.org Git - openwrt/staging/yousong.git/blob

   1 From a0088e83640d7d1544127dd668660462e9f78e52 Mon Sep 17 00:00:00 2001
   2 From: Simon Kelley <simon@thekelleys.org.uk>
   3 Date: Thu, 10 May 2018 21:43:14 +0100
   4 Subject: [PATCH 06/17] Handle query retry on REFUSED or SERVFAIL for
   5  DNSSEC-generated queries.
   6
   7 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
   8 ---
   9  src/forward.c | 46 ++++++++++++++++++++++++++++++++++++++++------
  10  1 file changed, 40 insertions(+), 6 deletions(-)
  11
  12 --- a/src/forward.c
  13 +++ b/src/forward.c
  14 @@ -298,9 +298,9 @@ static int forward_query(int udpfd, unio
  15                 fd = forward->rfd4->fd;
  16             }
  17
  18 -         while (retry_send( sendto(fd, (char *)header, plen, 0,
  19 -                                   &forward->sentto->addr.sa,
  20 -                                   sa_len(&forward->sentto->addr))));
  21 +         while (retry_send(sendto(fd, (char *)header, plen, 0,
  22 +                                  &forward->sentto->addr.sa,
  23 +                                  sa_len(&forward->sentto->addr))));
  24
  25           return 1;
  26         }
  27 @@ -804,8 +804,7 @@ void reply_query(int fd, int family, tim
  28    dump_packet((forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY)) ? DUMP_SEC_REPLY : DUMP_UP_REPLY,
  29               (void *)header, n, &serveraddr, NULL);
  30  #endif
  31 -
  32 -
  33 +
  34    /* log_query gets called indirectly all over the place, so
  35       pass these in global variables - sorry. */
  36    daemon->log_display_id = forward->log_id;
  37 @@ -826,6 +825,40 @@ void reply_query(int fd, int family, tim
  38        size_t plen;
  39        int is_sign;
  40
  41 +      /* For DNSSEC originated queries, just retry the query to the same server. */
  42 +      if (forward->flags & (FREC_DNSKEY_QUERY | FREC_DS_QUERY))
  43 +       {
  44 +         blockdata_retrieve(forward->stash, forward->stash_len, (void *)header);
  45 +         plen = forward->stash_len;
  46 +
  47 +         forward->forwardall = 2; /* only retry once */
  48 +
  49 +         if (forward->sentto->addr.sa.sa_family == AF_INET)
  50 +           log_query(F_NOEXTRA | F_DNSSEC | F_IPV4, "retry", (struct all_addr *)&forward->sentto->addr.in.sin_addr, "dnssec");
  51 +#ifdef HAVE_IPV6
  52 +         else
  53 +           log_query(F_NOEXTRA | F_DNSSEC | F_IPV6, "retry", (struct all_addr *)&forward->sentto->addr.in6.sin6_addr, "dnssec");
  54 +#endif
  55 +
  56 +         if (forward->sentto->sfd)
  57 +           fd = forward->sentto->sfd->fd;
  58 +         else
  59 +           {
  60 +#ifdef HAVE_IPV6
  61 +             if (forward->sentto->addr.sa.sa_family == AF_INET6)
  62 +               fd = forward->rfd6->fd;
  63 +             else
  64 +#endif
  65 +               fd = forward->rfd4->fd;
  66 +           }
  67 +
  68 +         while (retry_send(sendto(fd, (char *)header, plen, 0,
  69 +                                  &forward->sentto->addr.sa,
  70 +                                  sa_len(&forward->sentto->addr))));
  71 +
  72 +         return;
  73 +       }
  74 +
  75        /* In strict order mode, there must be a server later in the chain
  76          left to send to, otherwise without the forwardall mechanism,
  77          code further on will cycle around the list forwever if they
  78 @@ -1017,7 +1050,8 @@ void reply_query(int fd, int family, tim
  79  #ifdef HAVE_IPV6
  80                       new->rfd6 = NULL;
  81  #endif
  82 -                     new->flags &= ~(FREC_DNSKEY_QUERY | FREC_DS_QUERY);
  83 +                     new->flags &= ~(FREC_DNSKEY_QUERY | FREC_DS_QUERY | FREC_HAS_EXTRADATA);
  84 +                     new->forwardall = 0;
  85
  86                       new->dependent = forward; /* to find query awaiting new one. */
  87                       forward->blocking_query = new; /* for garbage cleaning */