etcp: instance-level conn status callbacks (NEW/UP/DOWN/DELETE), fix member online in chatgui

- Add etcp_add_conn_status_cbk/remove/set — unified callback for all connections
- 4 statuses: NEW, UP, DOWN, DELETE — one subscription covers all connections
- Fire points in etcp.c: create→NEW, on_up→UP, on_down→DOWN, close→DELETE
- chat_sync.c: replace cs_on_new_conn+per-conn subs with cs_on_conn_status
- db_sync.c: same migration to instance-level callback
- cs_is_peer_online: use conn->links_up instead of link->link_status (was 0 during INIT handshake)

src/db_sync.c

@@ -21,7 +21,7 @@ struct DB_SYNC;
 struct DB_SYNC_INSTANCE;
 
 static void db_sync_recv_cb(struct ETCP_CONN* conn, struct ll_entry* entry);
-static void db_sync_on_new_conn(struct ETCP_CONN* conn, void* arg);
+static void db_sync_on_conn_status(struct ETCP_CONN* conn, int status, void* arg);
 static void db_sync_on_conn_up(struct ETCP_CONN* conn, void* arg);
 static void db_sync_on_conn_down(struct ETCP_CONN* conn, void* arg);
 static void db_sync_peer_check_cb(void* arg);
@@ -1094,6 +1094,15 @@ static void db_sync_recv_cb(struct ETCP_CONN* conn, struct ll_entry* entry)
 // Connection callbacks
 // ============================================================
 
+static void db_sync_on_conn_status(struct ETCP_CONN* conn, int status, void* arg) {
+    switch (status) {
+    case ETCP_CONN_STATUS_UP:   db_sync_on_conn_up(conn, arg); break;
+    case ETCP_CONN_STATUS_DOWN: db_sync_on_conn_down(conn, arg); break;
+    default: break;
+    }
+}
+
+#if 0  /* replaced by db_sync_on_conn_status */
 static void db_sync_on_new_conn(struct ETCP_CONN* conn, void* arg)
 {
     (void)arg;
@@ -1102,6 +1111,7 @@ static void db_sync_on_new_conn(struct ETCP_CONN* conn, void* arg)
     etcp_conn_add_up_cbk(conn, db_sync_on_conn_up, NULL);
     etcp_conn_add_down_cbk(conn, db_sync_on_conn_down, NULL);
 }
+#endif
 
 static void db_sync_on_conn_up(struct ETCP_CONN* conn, void* arg)
 {
@@ -1355,19 +1365,7 @@ int db_sync_init(struct UTUN_INSTANCE* inst)
     }
 
     etcp_bind(inst, ETCP_RT_ID_DB_SYNC, db_sync_recv_cb);
-    etcp_set_new_conn_cbk(inst, db_sync_on_new_conn, NULL);
-
-    {
-        struct ll_entry* entry = inst->connections->head;
-        while (entry) {
-            struct conn_queue_entry* ce = (struct conn_queue_entry*)entry->data;
-            if (ce && ce->conn) {
-                etcp_conn_add_up_cbk(ce->conn, db_sync_on_conn_up, NULL);
-                etcp_conn_add_down_cbk(ce->conn, db_sync_on_conn_down, NULL);
-            }
-            entry = entry->next;
-        }
-    }
+    etcp_add_conn_status_cbk(inst, db_sync_on_conn_status, NULL);
 
     if (db->enabled)
         db->peer_check_timer = uasync_set_timeout(inst->ua, DB_SYNC_PEER_CHECK_INTERVAL * 10000u,
@@ -1394,17 +1392,7 @@ void db_sync_destroy(struct UTUN_INSTANCE* inst)
         if (si->peers) u_free(si->peers);
     }
 
-    {
-        struct ll_entry* entry = inst->connections->head;
-        while (entry) {
-            struct conn_queue_entry* ce = (struct conn_queue_entry*)entry->data;
-            if (ce && ce->conn) {
-                etcp_conn_remove_up_cbk(ce->conn, db_sync_on_conn_up, NULL);
-                etcp_conn_remove_down_cbk(ce->conn, db_sync_on_conn_down, NULL);
-            }
-            entry = entry->next;
-        }
-    }
+    etcp_remove_conn_status_cbk(inst, db_sync_on_conn_status, NULL);
 
     db_sqlite_close(db);
     if (db->instances) u_free(db->instances);

src/etcp.c

@@ -46,6 +46,7 @@ static void wait_ack_cb(struct ll_queue* q, void* arg);
 static void send_ack_req_cb(struct ll_queue* q, void* arg);
 static void etcp_conn_process_send_queue(struct ETCP_CONN* etcp);
 static void etcp_connection_free_deferred(void* arg);
+static void etcp_fire_conn_status(struct ETCP_CONN* etcp, int status);
 struct ETCP_DGRAM* etcp_request_pkt(struct ETCP_CONN* etcp);
 
 static void clear_queue(struct ll_queue* q) {
@@ -279,16 +280,24 @@ struct ETCP_CONN* etcp_connection_create(struct UTUN_INSTANCE* instance, char* n
         struct etcp_cbk_entry* cbe = instance->new_conn_cbks;
         while (cbe) { struct etcp_cbk_entry* n = cbe->next; cbe->fn(etcp, cbe->arg); cbe = n; }
     }
+    etcp_fire_conn_status(etcp, ETCP_CONN_STATUS_NEW);
 
     return etcp;
 }
 
 
+static void etcp_fire_conn_status(struct ETCP_CONN* etcp, int status) {
+    if (!etcp || !etcp->instance) return;
+    struct etcp_status_cbk_entry* cbe = etcp->instance->conn_status_cbks;
+    while (cbe) { struct etcp_status_cbk_entry* n = cbe->next; cbe->fn(etcp, status, cbe->arg); cbe = n; }
+}
+
 static void etcp_on_up(struct ETCP_CONN* etcp) {
     DEBUG_INFO(DEBUG_CATEGORY_ETCP, "[%s] Connection UP (links_up=%d initialized=%d)", etcp->log_name, etcp->links_up, etcp->initialized);
     etcp->callbacks_running = 1;
     struct etcp_cbk_entry* cbe = etcp->up_cbks;
     while (cbe) { struct etcp_cbk_entry* n = cbe->next; cbe->fn(etcp, cbe->arg); cbe = n; }
+    etcp_fire_conn_status(etcp, ETCP_CONN_STATUS_UP);
     etcp->callbacks_running = 0;
 }
 
@@ -297,6 +306,7 @@ static void etcp_on_down(struct ETCP_CONN* etcp) {
     etcp->callbacks_running = 1;
     struct etcp_cbk_entry* cbe = etcp->down_cbks;
     while (cbe) { struct etcp_cbk_entry* n = cbe->next; cbe->fn(etcp, cbe->arg); cbe = n; }
+    etcp_fire_conn_status(etcp, ETCP_CONN_STATUS_DOWN);
     etcp->callbacks_running = 0;
 }
 
@@ -382,6 +392,8 @@ void etcp_connection_close(struct ETCP_CONN* etcp) {
 
     etcp->state = 2; // deleted
 
+    etcp_fire_conn_status(etcp, ETCP_CONN_STATUS_DELETE);
+
     // === PHASE 2: deferred resource cleanup (only if no outstanding refs) ===
     if (etcp->ref_count == 0)
         uasync_call_soon(etcp->instance->ua, etcp, etcp_connection_free_deferred);

src/etcp_api.c

@@ -69,6 +69,34 @@ void etcp_conn_remove_down_cbk(struct ETCP_CONN* conn, etcp_cbk_fn fn, void* arg
 void etcp_add_new_conn_cbk(struct UTUN_INSTANCE* inst, etcp_cbk_fn fn, void* arg) { if (inst) etcp_cbk_add_to_chain(&inst->new_conn_cbks, fn, arg); }
 void etcp_remove_new_conn_cbk(struct UTUN_INSTANCE* inst, etcp_cbk_fn fn, void* arg) { if (inst) etcp_cbk_remove_from_chain(&inst->new_conn_cbks, fn, arg); }
 
+static void etcp_status_cbk_add_chain(struct etcp_status_cbk_entry** head, etcp_conn_status_fn fn, void* arg) {
+    if (!head || !fn) return;
+    struct etcp_status_cbk_entry* e = u_malloc(sizeof(struct etcp_status_cbk_entry));
+    if (!e) return;
+    e->fn = fn; e->arg = arg; e->next = *head;
+    *head = e;
+}
+static void etcp_status_cbk_remove_chain(struct etcp_status_cbk_entry** head, etcp_conn_status_fn fn, void* arg) {
+    if (!head || !fn) return;
+    struct etcp_status_cbk_entry** p = head;
+    while (*p) {
+        if ((*p)->fn == fn && (*p)->arg == arg) {
+            struct etcp_status_cbk_entry* rm = *p;
+            *p = rm->next; u_free(rm); return;
+        }
+        p = &(*p)->next;
+    }
+}
+void etcp_add_conn_status_cbk(struct UTUN_INSTANCE* inst, etcp_conn_status_fn fn, void* arg) { if (inst) etcp_status_cbk_add_chain(&inst->conn_status_cbks, fn, arg); }
+void etcp_remove_conn_status_cbk(struct UTUN_INSTANCE* inst, etcp_conn_status_fn fn, void* arg) { if (inst) etcp_status_cbk_remove_chain(&inst->conn_status_cbks, fn, arg); }
+void etcp_set_conn_status_cbk(struct UTUN_INSTANCE* inst, etcp_conn_status_fn fn, void* arg) {
+    if (!inst) return;
+    struct etcp_status_cbk_entry* entry = inst->conn_status_cbks;
+    while (entry) { struct etcp_status_cbk_entry* next = entry->next; u_free(entry); entry = next; }
+    inst->conn_status_cbks = NULL;
+    if (fn) etcp_status_cbk_add_chain(&inst->conn_status_cbks, fn, arg);
+}
+
 void etcp_set_routing_exchange_state(struct ETCP_CONN* conn, uint8_t new_state) {
     if (!conn) return;
     conn->routing_exchange_active = new_state;

src/etcp_api.h

@@ -44,10 +44,23 @@ extern "C" {
 #define ETCP_RT_ID_CONN_MGR       0x11 // Connection Manager — management connections
 #define ETCP_RT_ID_NTP_TIME       0x12 // NTP time sync между узлами
 
+// Connection status events (instance-level callback)
+#define ETCP_CONN_STATUS_NEW    0  // соединение создано
+#define ETCP_CONN_STATUS_UP     1  // соединение поднялось
+#define ETCP_CONN_STATUS_DOWN   2  // соединение упало
+#define ETCP_CONN_STATUS_DELETE 3  // соединение удалено
+
 // Forward declarations
 struct ETCP_CONN;
 struct UTUN_INSTANCE;
 
+typedef void (*etcp_conn_status_fn)(struct ETCP_CONN* conn, int status, void* arg);
+struct etcp_status_cbk_entry {
+    etcp_conn_status_fn fn;
+    void*               arg;
+    struct etcp_status_cbk_entry* next;
+};
+
 /**
  * @brief Тип коллбэка для приёма метрик от пира
  * @param user_ptr пользовательский указатель
@@ -162,6 +175,10 @@ void etcp_conn_remove_down_cbk(struct ETCP_CONN* conn, etcp_cbk_fn fn, void* arg
 void etcp_add_new_conn_cbk(struct UTUN_INSTANCE* inst, etcp_cbk_fn fn, void* arg);
 void etcp_remove_new_conn_cbk(struct UTUN_INSTANCE* inst, etcp_cbk_fn fn, void* arg);
 
+void etcp_add_conn_status_cbk(struct UTUN_INSTANCE* inst, etcp_conn_status_fn fn, void* arg);
+void etcp_remove_conn_status_cbk(struct UTUN_INSTANCE* inst, etcp_conn_status_fn fn, void* arg);
+void etcp_set_conn_status_cbk(struct UTUN_INSTANCE* inst, etcp_conn_status_fn fn, void* arg);
+
 void etcp_set_routing_exchange_state(struct ETCP_CONN* conn, uint8_t new_state);
 
 /**

src/utun_instance.h

@@ -102,6 +102,7 @@ struct UTUN_INSTANCE {
     
     // Callback chain for new ETCP connections
     struct etcp_cbk_entry* new_conn_cbks;
+    struct etcp_status_cbk_entry* conn_status_cbks;  // instance-level: NEW/UP/DOWN/DELETE
     void* test_user_ptr;             // Generic user pointer (used by tests)
 
     struct memory_pool* data_pool;// для входных-выходных данных пакета