1 files changed, 21 insertions, 2 deletions
diff --git a/src/grp-resolve/systemd-resolved/resolved-dns-stream.h b/src/grp-resolve/systemd-resolved/resolved-dns-stream.h
index 65be14c5ed..6538da457a 100644
--- a/src/grp-resolve/systemd-resolved/resolved-dns-stream.h
+++ b/src/grp-resolve/systemd-resolved/resolved-dns-stream.h
@@ -27,8 +27,16 @@ typedef struct DnsStream DnsStream;
 #include "resolved-dns-transaction.h"
 #include "resolved-manager.h"
 
+/* Streams are used by three subsystems:
+ *
+ *   1. The normal transaction logic when doing a DNS or LLMNR lookup via TCP
+ *   2. The LLMNR logic when accepting a TCP-based lookup
+ *   3. The DNS stub logic when accepting a TCP-based lookup
+ */
+
 struct DnsStream {
         Manager *manager;
+        int n_ref;
 
         DnsProtocol protocol;
 
@@ -51,12 +59,23 @@ struct DnsStream {
         int (*on_packet)(DnsStream *s);
         int (*complete)(DnsStream *s, int error);
 
-        DnsTransaction *transaction;
+        DnsTransaction *transaction; /* when used by the transaction logic */
+        DnsQuery *query;             /* when used by the DNS stub logic */
 
         LIST_FIELDS(DnsStream, streams);
 };
 
 int dns_stream_new(Manager *m, DnsStream **s, DnsProtocol protocol, int fd);
-DnsStream *dns_stream_free(DnsStream *s);
+DnsStream *dns_stream_unref(DnsStream *s);
+DnsStream *dns_stream_ref(DnsStream *s);
 
 int dns_stream_write_packet(DnsStream *s, DnsPacket *p);
+
+static inline bool DNS_STREAM_QUEUED(DnsStream *s) {
+        assert(s);
+
+        if (s->fd < 0) /* already stopped? */
+                return false;
+
+        return !!s->write_packet;
+}