From 7e8e0422aeb16f2a09a40546c61df753d10029b6 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 23 Jul 2014 00:57:25 +0200
Subject: resolved: implement negative caching

---
 src/resolve/resolved-dns-question.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/resolve/resolved-dns-question.c')

diff --git a/src/resolve/resolved-dns-question.c b/src/resolve/resolved-dns-question.c
index 026a67d7b3..056bd6eb64 100644
--- a/src/resolve/resolved-dns-question.c
+++ b/src/resolve/resolved-dns-question.c
@@ -65,9 +65,20 @@ DnsQuestion *dns_question_unref(DnsQuestion *q) {
 }
 
 int dns_question_add(DnsQuestion *q, DnsResourceKey *key) {
+        unsigned i;
+        int r;
+
         assert(q);
         assert(key);
 
+        for (i = 0; i < q->n_keys; i++) {
+                r = dns_resource_key_equal(q->keys[i], key);
+                if (r < 0)
+                        return r;
+                if (r > 0)
+                        return 0;
+        }
+
         if (q->n_keys >= q->n_allocated)
                 return -ENOSPC;
 
-- 
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