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authorDaniel Mack <daniel@zonque.org>2015-11-24 15:45:15 +0100
committerDaniel Mack <daniel@zonque.org>2015-12-08 16:41:45 +0100
commit23502de3b0891455c8ce499a9eb61b69d060a829 (patch)
tree9aa00643d216259e4f04abe8b5aeb61a4dbc3e34 /src
parentea12bcc78911fd3531955a799dbf6c5ac33bf567 (diff)
resolved: add cache flush flag to DnsResourceKey
MDNS has a 'key cache flush' flag for records which must be masked out for the parsers to do our right thing. We will also use that flag later (in a different patch) in order to alter the cache behavior.
Diffstat (limited to 'src')
-rw-r--r--src/resolve/resolved-dns-packet.c12
-rw-r--r--src/resolve/resolved-dns-rr.h4
2 files changed, 16 insertions, 0 deletions
diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
index 3a4482a1b7..35d1fb02be 100644
--- a/src/resolve/resolved-dns-packet.c
+++ b/src/resolve/resolved-dns-packet.c
@@ -1421,6 +1421,7 @@ fail:
int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
_cleanup_free_ char *name = NULL;
+ bool cache_flush = false;
uint16_t class, type;
DnsResourceKey *key;
size_t saved_rindex;
@@ -1443,12 +1444,23 @@ int dns_packet_read_key(DnsPacket *p, DnsResourceKey **ret, size_t *start) {
if (r < 0)
goto fail;
+ if (p->protocol == DNS_PROTOCOL_MDNS) {
+ /* See RFC6762, Section 10.2 */
+
+ if (class & MDNS_RR_CACHE_FLUSH) {
+ class &= ~MDNS_RR_CACHE_FLUSH;
+ cache_flush = true;
+ }
+ }
+
key = dns_resource_key_new_consume(class, type, name);
if (!key) {
r = -ENOMEM;
goto fail;
}
+ key->cache_flush = cache_flush;
+
name = NULL;
*ret = key;
diff --git a/src/resolve/resolved-dns-rr.h b/src/resolve/resolved-dns-rr.h
index b82fa77562..5cbb927681 100644
--- a/src/resolve/resolved-dns-rr.h
+++ b/src/resolve/resolved-dns-rr.h
@@ -45,6 +45,9 @@ enum {
#define DNSKEY_FLAG_ZONE_KEY (UINT16_C(1) << 8)
#define DNSKEY_FLAG_SEP (UINT16_C(1) << 0)
+/* mDNS RR flags */
+#define MDNS_RR_CACHE_FLUSH (UINT16_C(1) << 15)
+
/* DNSSEC algorithm identifiers, see
* http://tools.ietf.org/html/rfc4034#appendix-A.1 and
* https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml */
@@ -76,6 +79,7 @@ struct DnsResourceKey {
unsigned n_ref;
uint16_t class, type;
char *_name; /* don't access directy, use DNS_RESOURCE_KEY_NAME()! */
+ bool cache_flush:1;
};
/* Creates a temporary resource key. This is only useful to quickly