From 4ec076f8ed636e805700987be78fc5afb7db1bd7 Mon Sep 17 00:00:00 2001
From: Baptiste Assmann <bedis9@gmail.com>
Date: Wed, 9 Dec 2015 14:02:01 +0100
Subject: [PATCH] MINOR: dns: new MAX values

DNS_MIN_RECORD_SIZE: minimal size of a DNS record

DNS_MAX_QUERY_RECORDS: maximum number of query records we allow.
  For now, we send one DNS query per request.

DNS_MAX_ANSWER_RECORDS: maximum number of records we may found in a
  response

WIP dns: new MAX values
---
 include/types/dns.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/types/dns.h b/include/types/dns.h
index 19c6edcc6..01d42f92d 100644
--- a/include/types/dns.h
+++ b/include/types/dns.h
@@ -32,6 +32,16 @@
 #define DNS_MAX_NAME_SIZE	255
 #define DNS_MAX_UDP_MESSAGE	512
 
+/* DNS minimun record size: 1 char + 1 NULL + type + class */
+#define DNS_MIN_RECORD_SIZE	( 1 + 1 + 2 + 2 )
+
+/* maximum number of query records in a DNS response
+ * For now, we allow only one */
+#define DNS_MAX_QUERY_RECORDS 1
+
+/* maximum number of answer record in a DNS response */
+#define DNS_MAX_ANSWER_RECORDS ((DNS_MAX_UDP_MESSAGE - DNS_HEADER_SIZE) / DNS_MIN_RECORD_SIZE)
+
 /* DNS error messages */
 #define DNS_TOO_LONG_FQDN	"hostname too long"
 #define DNS_LABEL_TOO_LONG	"one label too long"