listnodes: expose global features.

Since nobody sets these yet, it's a bit moot, but it will be great in
future.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

gossipd/gossip.c

@@ -2146,15 +2146,14 @@ static struct io_plan *getnodes(struct io_conn *conn, struct daemon *daemon,
 		for (size_t i = 0; i < tal_count(ids); i++) {
 			n = get_node(daemon->rstate, &ids[i]);
 			if (n)
-				/* FIXME: Keep global features from node_announcement! */
-				append_node(&nodes, &ids[i], NULL, NULL, n);
+				append_node(&nodes, &ids[i], n->gfeatures,
+					    NULL, n);
 		}
 	} else {
 		struct node_map_iter i;
 		n = node_map_first(daemon->rstate->nodes, &i);
 		while (n != NULL) {
-			/* FIXME: Keep global features from node_announcement! */
-			append_node(&nodes, &n->id, NULL, NULL, n);
+			append_node(&nodes, &n->id, n->gfeatures, NULL, n);
 			n = node_map_next(daemon->rstate->nodes, &i);
 		}
 	}

gossipd/routing.c

@@ -148,6 +148,7 @@ static struct node *new_node(struct routing_state *rstate,
 	n->id = *id;
 	n->chans = tal_arr(n, struct chan *, 0);
 	n->alias = NULL;
+	n->gfeatures = NULL;
 	n->node_announcement = NULL;
 	n->node_announcement_index = 0;
 	n->last_timestamp = -1;
@@ -1287,6 +1288,8 @@ bool routing_add_node_announcement(struct routing_state *rstate, const u8 *msg T
 	memcpy(node->rgb_color, rgb_color, 3);
 	tal_free(node->alias);
 	node->alias = tal_dup_arr(node, u8, alias, 32, 0);
+	tal_free(node->gfeatures);
+	node->gfeatures = tal_steal(node, features);
 
 	tal_free(node->node_announcement);
 	node->node_announcement = tal_dup_arr(node, u8, msg, tal_len(msg), 0);

gossipd/routing.h

@@ -101,6 +101,9 @@ struct node {
 	/* Color to be used when displaying the name */
 	u8 rgb_color[3];
 
+	/* (Global) features */
+	u8 *gfeatures;
+
 	/* Cached `node_announcement` we might forward to new peers (or NULL). */
 	const u8 *node_announcement;
 	/* If public, this is non-zero. */