+++ /dev/null
-From 2c1aec1e979a209eb2f2b035314a8c973b4ac269 Mon Sep 17 00:00:00 2001
-From: Simon Kelley <simon@thekelleys.org.uk>
-Date: Thu, 7 Sep 2017 20:45:00 +0100
-Subject: [PATCH 7/9] Don't return arcount=1 if EDNS0 RR won't fit in the
- packet.
-
- Omitting the EDNS0 RR but setting arcount gives a malformed packet.
- Also, don't accept UDP packet size less than 512 in recieved EDNS0.
----
- src/edns0.c | 5 ++++-
- src/forward.c | 2 ++
- 2 files changed, 6 insertions(+), 1 deletion(-)
-
-diff --git a/src/edns0.c b/src/edns0.c
-index 5bdc133..a8d0167 100644
---- a/src/edns0.c
-+++ b/src/edns0.c
-@@ -221,7 +221,10 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
- free(buff);
- p += rdlen;
- }
-- header->arcount = htons(ntohs(header->arcount) + 1);
-+
-+ /* Only bump arcount if RR is going to fit */
-+ if (((ssize_t)optlen) <= (limit - (p + 4)))
-+ header->arcount = htons(ntohs(header->arcount) + 1);
- }
-
- if (((ssize_t)optlen) > (limit - (p + 4)))
-diff --git a/src/forward.c b/src/forward.c
-index 9b464d3..0f8f462 100644
---- a/src/forward.c
-+++ b/src/forward.c
-@@ -1408,6 +1408,8 @@ void receive_query(struct listener *listen, time_t now)
- defaults to 512 */
- if (udp_size > daemon->edns_pktsz)
- udp_size = daemon->edns_pktsz;
-+ else if (udp_size < PACKETSZ)
-+ udp_size = PACKETSZ; /* Sanity check - can't reduce below default. RFC 6891 6.2.3 */
- }
-
- #ifdef HAVE_AUTH
---
-2.9.5
-