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authorLennart Poettering <lennart@poettering.net>2015-07-28 18:38:54 +0200
committerLennart Poettering <lennart@poettering.net>2015-07-28 18:38:54 +0200
commit1086182d83d4c02a75f96f0184d5e8e5d3af6528 (patch)
tree16f3ad53eeebf8da3a6e48251f75f29103bf2fd8 /src/resolve
parent87b46c575a14c133fbc408b56b0835f13a918b1d (diff)
resolved: compare dns question arrays properly
Let's optimize things a bit and properly compare DNS question arrays, instead of checking if they are mutual supersets. This also makes ANY query handling more accurate.
Diffstat (limited to 'src/resolve')
-rw-r--r--src/resolve/resolved-dns-question.c40
-rw-r--r--src/resolve/resolved-dns-question.h2
-rw-r--r--src/resolve/resolved-dns-transaction.c4
3 files changed, 44 insertions, 2 deletions
diff --git a/src/resolve/resolved-dns-question.c b/src/resolve/resolved-dns-question.c
index 4d71f5e3d4..0efe740d1a 100644
--- a/src/resolve/resolved-dns-question.c
+++ b/src/resolve/resolved-dns-question.c
@@ -188,6 +188,46 @@ int dns_question_is_superset(DnsQuestion *q, DnsQuestion *other) {
return 1;
}
+int dns_question_contains(DnsQuestion *a, DnsResourceKey *k) {
+ unsigned j;
+ int r;
+
+ assert(a);
+ assert(k);
+
+ for (j = 0; j < a->n_keys; j++) {
+ r = dns_resource_key_equal(a->keys[j], k);
+ if (r != 0)
+ return r;
+ }
+
+ return 0;
+}
+
+int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b) {
+ unsigned j;
+ int r;
+
+ assert(a);
+ assert(b);
+
+ /* Checks if all keys in a are also contained b, and vice versa */
+
+ for (j = 0; j < a->n_keys; j++) {
+ r = dns_question_contains(b, a->keys[j]);
+ if (r <= 0)
+ return r;
+ }
+
+ for (j = 0; j < b->n_keys; j++) {
+ r = dns_question_contains(a, b->keys[j]);
+ if (r <= 0)
+ return r;
+ }
+
+ return 1;
+}
+
int dns_question_cname_redirect(DnsQuestion *q, const char *name, DnsQuestion **ret) {
_cleanup_(dns_question_unrefp) DnsQuestion *n = NULL;
bool same = true;
diff --git a/src/resolve/resolved-dns-question.h b/src/resolve/resolved-dns-question.h
index 4ba2fe9f0e..fc98677798 100644
--- a/src/resolve/resolved-dns-question.h
+++ b/src/resolve/resolved-dns-question.h
@@ -43,6 +43,8 @@ int dns_question_matches_rr(DnsQuestion *q, DnsResourceRecord *rr);
int dns_question_matches_cname(DnsQuestion *q, DnsResourceRecord *rr);
int dns_question_is_valid(DnsQuestion *q);
int dns_question_is_superset(DnsQuestion *q, DnsQuestion *other);
+int dns_question_contains(DnsQuestion *a, DnsResourceKey *k);
+int dns_question_is_equal(DnsQuestion *a, DnsQuestion *b);
int dns_question_cname_redirect(DnsQuestion *q, const char *name, DnsQuestion **ret);
diff --git a/src/resolve/resolved-dns-transaction.c b/src/resolve/resolved-dns-transaction.c
index b235fda3d2..8a93b265c6 100644
--- a/src/resolve/resolved-dns-transaction.c
+++ b/src/resolve/resolved-dns-transaction.c
@@ -406,8 +406,8 @@ void dns_transaction_process_reply(DnsTransaction *t, DnsPacket *p) {
}
/* Only consider responses with equivalent query section to the request */
- if (!dns_question_is_superset(p->question, t->question) ||
- !dns_question_is_superset(t->question, p->question)) {
+ r = dns_question_is_equal(p->question, t->question);
+ if (r <= 0) {
dns_transaction_complete(t, DNS_TRANSACTION_INVALID_REPLY);
return;
}