Ensure directory service tests aren't creating a global routing table

conf_schema.h

@@ -475,6 +475,7 @@ ATOM(short,                 type,            OVERLAY_INTERFACE_WIFI, interface_t
 SUB_STRUCT(mdp_iftype,      mdp,)
 ATOM(bool_t,                send_broadcasts, 1, boolean,, "If false, don't send any broadcast packets")
 ATOM(bool_t,                default_route,   0, boolean,, "If true, use this interface as a default route")
+ATOM(bool_t,                dont_route,      0, boolean,, "If true, do not advertise any links discovered on this interface")
 ATOM(bool_t,                prefer_unicast,  1, boolean,, "If true, send data as unicast IP packets if available")
 ATOM(bool_t,                debug,           0, boolean,, "If true, log details of every outgoing packet")
 ATOM(bool_t,                point_to_point,  0, boolean,, "If true, assume there will only be two devices on this interface")

overlay_interface.c

@@ -414,6 +414,7 @@ overlay_interface_init(const char *name, struct socket_address *addr,
   interface->port = ifconfig->port;
   interface->type = ifconfig->type;
   interface->send_broadcasts = ifconfig->send_broadcasts;
+  interface->dont_route = ifconfig->dont_route;
   interface->prefer_unicast = ifconfig->prefer_unicast;
   interface->default_route = ifconfig->default_route;
   interface->socket_type = ifconfig->socket_type;

overlay_interface.h

@@ -105,6 +105,7 @@ typedef struct overlay_interface {
   int type;
   int socket_type;
   char send_broadcasts;
+  char dont_route;
   char prefer_unicast;
   /* Not necessarily the real MTU, but the largest frame size we are willing to TX.
    For radio links the actual maximum and the maximum that is likely to be delivered reliably are

route_link.c

@@ -557,6 +557,10 @@ static int append_link(struct subscriber *subscriber, void *context)
     if (subscriber->identity)
       keyring_send_unlock(subscriber);
     
+    if (best_link && best_link->destination && best_link->destination->interface->dont_route){
+      // don't talk about links across interfaces with dont_route
+      state->next_update = TIME_MS_NEVER_WILL;
+    }else{
       if (state->next_update - 20 <= now){
 	if (append_link_state(payload, 0, state->transmitter, subscriber, -1, 
 	    best_link?best_link->link_version:-1, -1, 0, best_link?best_link->drop_rate:32)){
@@ -567,6 +571,7 @@ static int append_link(struct subscriber *subscriber, void *context)
 	state->next_update = now + 5000;
       }
     }
+  }
 
   if (state->next_update < ALARM_STRUCT(link_send).alarm)
     ALARM_STRUCT(link_send).alarm = state->next_update;
@@ -895,9 +900,8 @@ static int link_send_neighbours()
   while (n){
     neighbour_find_best_link(n);
 
-    if (n->next_neighbour_update <= now){
+    if (n->next_neighbour_update <= now)
       send_neighbour_link(n);
-    }
 
     if (n->next_neighbour_update < ALARM_STRUCT(link_send).alarm)
       ALARM_STRUCT(link_send).alarm = n->next_neighbour_update;

tests/directory_service

@@ -105,6 +105,7 @@ configure_node() {
       set interfaces.0.file dummy1 \
       set interfaces.0.socket_type file \
       set interfaces.0.send_broadcasts 0 \
+      set interfaces.0.dont_route 1 \
       set interfaces.0.drop_broadcasts on \
       set interfaces.0.default_route 1 \
       set interfaces.0.dummy_address 10.0.${instance_number}.1 \
@@ -141,17 +142,24 @@ test_routing() {
    set_instance +B
    executeOk_servald route print
    assertStdoutGrep --matches=1 "^$SIDA:UNICAST:"
+   assertStdoutGrep --matches=0 "^$SIDC:"
    executeOk_servald dna lookup "$DIDC"
    assertStdoutLineCount '==' 3
    assertStdoutGrep --matches=1 "^sid://$SIDC/local/$DIDC:$DIDC:$NAMEC\$"
    set_instance +C
    executeOk_servald route print
    assertStdoutGrep --matches=1 "^$SIDA:UNICAST:"
+   assertStdoutGrep --matches=0 "^$SIDB:"
    executeOk_servald dna lookup "$DIDB"
    assertStdoutLineCount '==' 3
    assertStdoutGrep --matches=1 "^sid://$SIDB/local/$DIDB:$DIDB:$NAMEB\$"
    executeOk_servald mdp ping $SIDB 3
    tfw_cat --stdout --stderr
+   executeOk_servald route print
+   tfw_cat --stdout
+   set_instance +B
+   executeOk_servald route print
+   tfw_cat --stdout
    assert_status_all_servald_servers running
 }