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authorLennart Poettering <lennart@poettering.net>2014-07-29 23:52:57 +0200
committerLennart Poettering <lennart@poettering.net>2014-07-29 23:53:08 +0200
commit2442b93d15f5523aba0c5dc56a42757af889c483 (patch)
tree095c1e7ee80cb2dc152b2926270578ee06ac9dac /src/resolve
parenta2a416f768e2aa7db5b975cd50eb19237cac9cce (diff)
resolved: the llmnr destination address check applies to queries, not to responses
Diffstat (limited to 'src/resolve')
-rw-r--r--src/resolve/resolved-dns-query.c11
-rw-r--r--src/resolve/resolved-dns-scope.c12
2 files changed, 12 insertions, 11 deletions
diff --git a/src/resolve/resolved-dns-query.c b/src/resolve/resolved-dns-query.c
index f3007aa19c..271b8fd9c9 100644
--- a/src/resolve/resolved-dns-query.c
+++ b/src/resolve/resolved-dns-query.c
@@ -269,17 +269,6 @@ void dns_query_transaction_process_reply(DnsQueryTransaction *t, DnsPacket *p) {
if (p->family != t->scope->family)
return;
- /* Don't accept UDP packets directed to anything but
- * the LLMNR multicast addresses. */
-
- if (p->ipproto == IPPROTO_UDP) {
- if (p->family == AF_INET && !in_addr_equal(AF_INET, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV4_ADDRESS))
- return;
-
- if (p->family == AF_INET6 && !in_addr_equal(AF_INET6, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV6_ADDRESS))
- return;
- }
-
/* Tentative replies shall be discarded, see RFC 4795,
* 2.1.1 */
diff --git a/src/resolve/resolved-dns-scope.c b/src/resolve/resolved-dns-scope.c
index 5742f3ef47..b975ac4092 100644
--- a/src/resolve/resolved-dns-scope.c
+++ b/src/resolve/resolved-dns-scope.c
@@ -452,6 +452,18 @@ void dns_scope_process_query(DnsScope *s, DnsStream *stream, DnsPacket *p) {
if (p->protocol != DNS_PROTOCOL_LLMNR)
return;
+ if (p->ipproto == IPPROTO_UDP) {
+ /* Don't accept UDP queries directed to anything but
+ * the LLMNR multicast addresses. See RFC 4795,
+ * section 2.5.*/
+
+ if (p->family == AF_INET && !in_addr_equal(AF_INET, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV4_ADDRESS))
+ return;
+
+ if (p->family == AF_INET6 && !in_addr_equal(AF_INET6, &p->destination, (union in_addr_union*) &LLMNR_MULTICAST_IPV6_ADDRESS))
+ return;
+ }
+
r = dns_packet_extract(p);
if (r < 0) {
log_debug("Failed to extract resources from incoming packet: %s", strerror(-r));