From: Chris Hofstaedtler <chris.hofstaedtler@deduktiva.com>
Date: Mon, 8 Jan 2018 15:19:37 +0000 (+0100)
Subject: Clarify where offset comes from
X-Git-Tag: dnsdist-1.3.0~160^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f865c0b028dc7d5f7f2ee2f2ad3f6675e231a394;p=pdns

Clarify where offset comes from
---

diff --git a/pdns/dnsdist-lua-rules.cc b/pdns/dnsdist-lua-rules.cc
index 3ecafb793..edfc9f24b 100644
--- a/pdns/dnsdist-lua-rules.cc
+++ b/pdns/dnsdist-lua-rules.cc
@@ -761,7 +761,7 @@ public:
       return d_extrcode == 0;
     }
 
-    /* root label (1), type (2), class (2), ttl (4) + rdlen (2)*/
+    // root label (1), type (2), class (2), ttl (4) + rdlen (2)
     if (optLen < 11) {
       return false;
     }
@@ -772,6 +772,7 @@ public:
     }
     EDNS0Record edns0;
     static_assert(sizeof(EDNS0Record) == sizeof(uint32_t), "sizeof(EDNS0Record) must match sizeof(uint32_t) AKA RR TTL size");
+    // copy out 4-byte "ttl" (really the EDNS0 record), after root label (1) + type (2) + class (2).
     memcpy(&edns0, optStart + 5, sizeof edns0);
 
     return d_extrcode == edns0.extRCode;