Use netlink to detect going online

Integrates libnl to detect adding routes. When a route is added, the
offline status of all back ends is reset. This patch adds no heuristics
to detect whether back end went offline.

Fixes: #456

1 files changed, 20 insertions, 0 deletions

diff --git a/src/providers/data_provider_be.c b/src/providers/data_provider_be.c
index 059a0514e..004ee0973 100644
--- a/src/providers/data_provider_be.c
+++ b/src/providers/data_provider_be.c
@@ -55,11 +55,14 @@ static int data_provider_res_init(DBusMessage *message,
                                   struct sbus_connection *conn);
 static int data_provider_go_offline(DBusMessage *message,
                                     struct sbus_connection *conn);
+static int data_provider_reset_offline(DBusMessage *message,
+                                       struct sbus_connection *conn);
 
 struct sbus_method monitor_be_methods[] = {
     { MON_CLI_METHOD_PING, monitor_common_pong },
     { MON_CLI_METHOD_RES_INIT, data_provider_res_init },
     { MON_CLI_METHOD_OFFLINE, data_provider_go_offline },
+    { MON_CLI_METHOD_RESET_OFFLINE, data_provider_reset_offline },
     { MON_CLI_METHOD_ROTATE, monitor_common_rotate_logs },
     { NULL, NULL }
 };
@@ -170,6 +173,14 @@ void be_mark_offline(struct be_ctx *ctx)
     be_run_offline_cb(ctx);
 }
 
+void be_reset_offline(struct be_ctx *ctx)
+{
+    DEBUG(8, ("Going back online!\n"));
+
+    ctx->offstat.offline = false;
+    be_run_online_cb(ctx);
+}
+
 static int be_check_online(DBusMessage *message, struct sbus_connection *conn)
 {
     struct be_client *becli;
@@ -1229,3 +1240,12 @@ static int data_provider_go_offline(DBusMessage *message,
     be_mark_offline(be_ctx);
     return monitor_common_pong(message, conn);
 }
+
+static int data_provider_reset_offline(DBusMessage *message,
+                                       struct sbus_connection *conn)
+{
+    struct be_ctx *be_ctx;
+    be_ctx = talloc_get_type(sbus_conn_get_private_data(conn), struct be_ctx);
+    be_reset_offline(be_ctx);
+    return monitor_common_pong(message, conn);
+}