--- lbbs/include/common.h	2004/10/18 11:34:15	1.4
+++ lbbs/include/common.h	2025/11/27 03:17:15	1.68
@@ -1,26 +1,96 @@
-/***************************************************************************
-                          common.h  -  description
-                             -------------------
-    begin                : Mon Oct 18 2004
-    copyright            : (C) 2004 by Leaflet
-    email                : leaflet@leafok.com
- ***************************************************************************/
-
-/***************************************************************************
- *                                                                         *
- *   This program is free software; you can redistribute it and/or modify  *
- *   it under the terms of the GNU General Public License as published by  *
- *   the Free Software Foundation; either version 2 of the License, or     *
- *   (at your option) any later version.                                   *
- *                                                                         *
- ***************************************************************************/
-
-#include <stdio.h>
-#include <time.h>
-#include <unistd.h>
-#include <sys/param.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/socket.h>
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * common
+ *   - common definitions
+ *
+ * Copyright (C) 2004-2025  Leaflet <leaflet@leafok.com>
+ */
 
-extern char app_home_dir[256];
+#ifndef _COMMON_H_
+#define _COMMON_H_
+
+#include <stddef.h>
+#include <libssh/libssh.h>
+#include <libssh/server.h>
+
+enum common_constant_t
+{
+    LINE_BUFFER_LEN = 1024,
+    FILE_PATH_LEN = 4096,
+    FILE_NAME_LEN = 256,
+
+    // Screen
+    SCREEN_ROWS = 24,
+    SCREEN_COLS = 80,
+
+    TAB_SIZE = 4,
+
+    // Network
+    MAX_CLIENT_LIMIT = 2000,
+    MAX_CLIENT_PER_IP_LIMIT = 1000,
+    IP_ADDR_LEN = 50,
+    MAX_EVENTS = 10,
+};
+
+// Version
+extern const char APP_INFO[];
+extern const char COPYRIGHT_INFO[];
+
+// Enviroment
+extern const char CONF_BBSD[];
+extern const char CONF_MENU[];
+extern const char CONF_BBSNET[];
+extern const char CONF_BWF[];
+extern const char CONF_TOP10_MENU[];
+extern const char SSH_HOST_KEYFILE[];
+
+extern const char LOG_FILE_INFO[];
+extern const char LOG_FILE_ERROR[];
+
+extern const char DATA_WELCOME[];
+extern const char DATA_REGISTER[];
+extern const char DATA_GOODBYE[];
+extern const char DATA_LICENSE[];
+extern const char DATA_COPYRIGHT[];
+extern const char DATA_VERSION[];
+extern const char DATA_LOGIN_ERROR[];
+extern const char DATA_ACTIVE_BOARD[];
+extern const char DATA_READ_HELP[];
+extern const char DATA_EDITOR_HELP[];
+
+extern const char VAR_BBS_TOP[];
+
+extern const char VAR_ARTICLE_BLOCK_SHM[];
+extern const char VAR_SECTION_LIST_SHM[];
+extern const char VAR_TRIE_DICT_SHM[];
+extern const char VAR_USER_LIST_SHM[];
+
+extern const char VAR_ARTICLE_CACHE_DIR[];
+extern const char VAR_GEN_EX_MENU_DIR[];
+extern const char VAR_SECTION_AID_LOC_DIR[];
+
+// File loader
+extern const char *data_files_load_startup[];
+extern const int data_files_load_startup_count;
+
+// Network
+extern char hostaddr_client[IP_ADDR_LEN];
+extern int port_client;
+
+// SSHv2
+extern int SSH_v2;
+extern ssh_session SSH_session;
+extern ssh_channel SSH_channel;
+
+// Signal handler
+extern void sig_hup_handler(int);
+extern void sig_term_handler(int);
+extern void sig_chld_handler(int);
+
+// System
+extern volatile int SYS_server_exit;
+extern volatile int SYS_child_process_count;
+extern volatile int SYS_child_exit;
+extern volatile int SYS_conf_reload;
+
+#endif //_COMMON_H_