Speed up reconnections on network interface changes.

Catta informs us whenever an interface comes online or goes offline. If we
detect that there are no online interfaces, immediately terminate all meta-
connections. Otherwise, reset the ping timers and reconnection timers for
outgoing connections.

diff --git a/src/discovery.c b/src/discovery.c
index 67a349499c9c4a0162a5252aa38797f0e4775602..95e5ed65d86da5e75297fd0fa94a9dd8eb9e762f 100644 (file)
--- a/src/discovery.c
+++ b/src/discovery.c
@@ -15,6 +15,7 @@
 #include "logger.h"
 #include "node.h"
 #include "connection.h"
+#include "xalloc.h"
 
 #define MESHLINK_MDNS_SERVICE_TYPE "_%s._tcp"
 #define MESHLINK_MDNS_NAME_KEY "name"
@@ -60,7 +61,7 @@ static void discovery_entry_group_callback(CattaServer *server, CattaSEntryGroup
 
        case CATTA_ENTRY_GROUP_UNCOMMITED:
        case CATTA_ENTRY_GROUP_REGISTERING:
-               ;
+               break;
        }
 
        pthread_mutex_unlock(&(mesh->mesh_mutex));
@@ -310,9 +311,17 @@ static void discovery_browse_callback(CattaSServiceBrowser *browser, CattaIfInde
 
        case CATTA_BROWSER_NEW:
                catta_s_service_resolver_new(mesh->catta_server, interface_, protocol, name, type, domain, CATTA_PROTO_UNSPEC, 0, discovery_resolve_callback, mesh);
+               pthread_mutex_lock(&mesh->mesh_mutex);
+               handle_network_change(mesh, ++mesh->catta_interfaces);
+               pthread_mutex_unlock(&mesh->mesh_mutex);
                break;
 
        case CATTA_BROWSER_REMOVE:
+               pthread_mutex_lock(&mesh->mesh_mutex);
+               handle_network_change(mesh, --mesh->catta_interfaces);
+               pthread_mutex_unlock(&mesh->mesh_mutex);
+               break;
+
        case CATTA_BROWSER_ALL_FOR_NOW:
        case CATTA_BROWSER_CACHE_EXHAUSTED:
                break;
@@ -500,4 +509,6 @@ void discovery_stop(meshlink_handle_t *mesh) {
                free(mesh->catta_servicetype);
                mesh->catta_servicetype = NULL;
        }
+
+       mesh->catta_interfaces = 0;
 }

diff --git a/src/meshlink.c b/src/meshlink.c
index 302624fc5d0944cdd53934bd272a11d942ee8d65..b1f5c918fa68dd9d1d29e09a710c60d73b3bd51e 100644 (file)
--- a/src/meshlink.c
+++ b/src/meshlink.c
@@ -3090,6 +3090,21 @@ end:
 #endif
 }
 
+void handle_network_change(meshlink_handle_t *mesh, bool online) {
+       if(!mesh->connections) {
+               return;
+       }
+
+       if(online) {
+               retry(mesh);
+       } else {
+               // We are off-line. Terminate all active connections.
+               for list_each(connection_t, c, mesh->connections) {
+                       terminate_connection(mesh, c, false);
+               }
+       }
+}
+
 static void __attribute__((constructor)) meshlink_init(void) {
        crypto_init();
        unsigned int seed;

diff --git a/src/meshlink_internal.h b/src/meshlink_internal.h
index 84368ee8cac938881897fc1dcc29b12600568128..b31c16eb1cc3b92fef8bd1373f9c07573a11e2d9 100644 (file)
--- a/src/meshlink_internal.h
+++ b/src/meshlink_internal.h
@@ -166,6 +166,7 @@ struct meshlink_handle {
        struct CattaSimplePoll *catta_poll;
        struct CattaSEntryGroup *catta_group;
        char *catta_servicetype;
+       unsigned int catta_interfaces;
 
        int netns;
        void *config_key;
@@ -205,6 +206,7 @@ extern meshlink_log_level_t global_log_level;
 extern meshlink_log_cb_t global_log_cb;
 extern int check_port(meshlink_handle_t *mesh);
 extern void handle_duplicate_node(meshlink_handle_t *mesh, struct node_t *n);
+extern void handle_network_change(meshlink_handle_t *mesh, bool online);
 
 /// Device class traits
 typedef struct {