(trunk libT) #4016 "blocklists loaded in Transmission should be used to filter DHT communication." -- fixed.

libtransmission/tr-udp.c

@@ -192,6 +192,8 @@ event_callback(int s, short type UNUSED, void *sv)
     unsigned char buf[4096];
     struct sockaddr_storage from;
     tr_session *ss = sv;
+    tr_address addr;
+    tr_port port;
 
     assert(tr_isSession(sv));
     assert(type == EV_READ);
@@ -200,6 +202,11 @@ event_callback(int s, short type UNUSED, void *sv)
     rc = recvfrom(s, buf, 4096 - 1, 0,
                   (struct sockaddr*)&from, &fromlen);
 
+    /* don't process messages from blocked addresses */
+    if( !tr_address_from_sockaddr_storage( &addr, &port, &from )
+            || tr_sessionIsAddressBlocked( ss, &addr ) )
+        return;
+
     /* Since most packets we receive here are µTP, make quick inline
        checks for the other protocols.  The logic is as follows:
        - all DHT packets start with 'd';