chatgui: add CMake build for libutun (C library linked into GUI)

- Add tools/chatgui/libutun/CMakeLists.txt — builds libuasync (from lib/*.c)
  and libutun (from src/*.c except utun.c) as static libraries
- All C code compiled as C99, linked into chatgui C++ binary
- Include paths and defs match autotools build
- chatgui CMakeLists.txt: add_subdirectory(libutun), link utun library
- Fix zxing-cpp docs/ directory issue

tools/chatgui/CMakeLists.txt

@@ -5,6 +5,9 @@ set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_AUTORCC ON)
+set(CMAKE_C_STANDARD 99)
+
+find_package(OpenSSL REQUIRED)
 
 find_package(Qt5 COMPONENTS Widgets Network Test QUIET)
 if(NOT Qt5_FOUND)
@@ -37,6 +40,9 @@ set(BUILD_SHARED_LIBS OFF CACHE BOOL "")
 add_subdirectory(zxing-cpp)
 set_target_properties(ZXing PROPERTIES AUTOMOC OFF)
 
+# uTun core library (C, built from ../src/ and ../lib/)
+add_subdirectory(libutun)
+
 add_executable(chatgui
     src/main.cpp
     src/mainwindow.cpp
@@ -66,7 +72,7 @@ add_executable(chatgui
 target_include_directories(chatgui PRIVATE ${CMAKE_SOURCE_DIR}/db)
 target_compile_definitions(chatgui PRIVATE SQLITE_THREADSAFE=1)
 set_source_files_properties(db/sqlite3.c PROPERTIES LANGUAGE C)
-target_link_libraries(chatgui PRIVATE ${QT_LIBS} rlottie::rlottie ZLIB::ZLIB OpenSSL::Crypto ZXing::ZXing pthread dl)
+target_link_libraries(chatgui PRIVATE ${QT_LIBS} rlottie::rlottie ZLIB::ZLIB OpenSSL::Crypto ZXing::ZXing utun pthread dl)
 
 # ============================================================================
 # Tests

tools/chatgui/libutun/CMakeLists.txt

@@ -0,0 +1,139 @@
+cmake_minimum_required(VERSION 3.16)
+
+set(LIB_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/../../../lib)
+set(SRC_DIR  ${CMAKE_CURRENT_SOURCE_DIR}/../../../src)
+
+# ============================================================================
+# libuasync — low-level runtime library
+# ============================================================================
+
+set(UASYNC_SOURCES
+    ${LIB_DIR}/ll_queue.c
+    ${LIB_DIR}/u_async.c
+    ${LIB_DIR}/debug_config.c
+    ${LIB_DIR}/timeout_heap.c
+    ${LIB_DIR}/memory_pool.c
+    ${LIB_DIR}/sha256.c
+    ${LIB_DIR}/socket_compat.c
+    ${LIB_DIR}/platform_compat.c
+    ${LIB_DIR}/getmyip.c
+    ${LIB_DIR}/swm_min.c
+    ${LIB_DIR}/mem.c
+    ${LIB_DIR}/radix.c
+    ${LIB_DIR}/serialize.c
+    ${LIB_DIR}/tcp_io.c
+    ${LIB_DIR}/liblmdb/mdb.c
+    ${LIB_DIR}/liblmdb/midl.c
+)
+
+add_library(uasync STATIC ${UASYNC_SOURCES})
+
+target_include_directories(uasync PUBLIC
+    ${LIB_DIR}
+    ${SRC_DIR}
+    ${LIB_DIR}/liblmdb
+)
+
+target_compile_definitions(uasync PRIVATE
+    _ISOC99_SOURCE
+    DEBUG_OUTPUT_STDERR
+)
+
+set_target_properties(uasync PROPERTIES
+    C_STANDARD 99
+    C_STANDARD_REQUIRED ON
+)
+
+# ============================================================================
+# libutun — VPN core library (all src/ except utun.c)
+# ============================================================================
+
+# Common sources (all platforms)
+set(UTUN_COMMON_SOURCES
+    ${SRC_DIR}/utun_instance.c
+    ${SRC_DIR}/config_parser.c
+    ${SRC_DIR}/config_updater.c
+    ${SRC_DIR}/route_lib.c
+    ${SRC_DIR}/route6_lib.c
+    ${SRC_DIR}/route_bgp.c
+    ${SRC_DIR}/route_ping.c
+    ${SRC_DIR}/route_node.c
+    ${SRC_DIR}/route_node_lmdb.c
+    ${SRC_DIR}/route_connectivity.c
+    ${SRC_DIR}/conn_mgr.c
+    ${SRC_DIR}/db_sync.c
+    ${SRC_DIR}/routing.c
+    ${SRC_DIR}/tun_if.c
+    ${SRC_DIR}/tun_route.c
+    ${SRC_DIR}/etcp.c
+    ${SRC_DIR}/etcp_connections.c
+    ${SRC_DIR}/etcp_bbr.c
+    ${SRC_DIR}/etcp_loadbalancer.c
+    ${SRC_DIR}/etcp_debug.c
+    ${SRC_DIR}/etcp_dump.c
+    ${SRC_DIR}/secure_channel.c
+    ${SRC_DIR}/crc32.c
+    ${SRC_DIR}/stcp_link.c
+    ${SRC_DIR}/stcp.c
+    ${SRC_DIR}/stcp_server.c
+    ${SRC_DIR}/stcp_client.c
+    ${SRC_DIR}/pkt_normalizer.c
+    ${SRC_DIR}/packet_dump.c
+    ${SRC_DIR}/etcp_api.c
+    ${SRC_DIR}/etcp_connect.c
+    ${SRC_DIR}/control_server.c
+    ${SRC_DIR}/msg_transport.c
+    ${SRC_DIR}/firewall.c
+    ${SRC_DIR}/eim_nat.c
+    ${SRC_DIR}/nat_transport.c
+    ${SRC_DIR}/dummynet.c
+    ${SRC_DIR}/etcp_router.c
+    ${SRC_DIR}/proxy/tcp_proxy_client.c
+    ${SRC_DIR}/proxy/tcp_proxy_server.c
+    ${SRC_DIR}/proxy/udp_proxy.c
+    ${SRC_DIR}/proxy/socks_proxy.c
+    ${SRC_DIR}/proxy/icmp_proxy.c
+    ${SRC_DIR}/lwip_tcp/lwip_pbuf.c
+    ${SRC_DIR}/lwip_tcp/lwip_tcp.c
+    ${SRC_DIR}/lwip_tcp/lwip_tcp_in.c
+    ${SRC_DIR}/lwip_tcp/lwip_tcp_out.c
+)
+
+# Platform-specific TUN implementation
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_linux.c)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_freebsd.c)
+elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
+    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_windows.c)
+else()
+    set(UTUN_TUN_SOURCES ${SRC_DIR}/tun_linux.c)
+endif()
+
+add_library(utun STATIC ${UTUN_COMMON_SOURCES} ${UTUN_TUN_SOURCES})
+
+target_include_directories(utun PUBLIC
+    ${SRC_DIR}
+    ${LIB_DIR}
+    ${SRC_DIR}/uip
+)
+
+target_compile_definitions(utun PRIVATE
+    USE_OPENSSL
+)
+
+set_target_properties(utun PROPERTIES
+    C_STANDARD 99
+    C_STANDARD_REQUIRED ON
+)
+
+target_link_libraries(utun PUBLIC
+    uasync
+    OpenSSL::Crypto
+    ${CMAKE_THREAD_LIBS_INIT}
+)
+
+# Platform-specific link flags
+if(WIN32)
+    target_link_libraries(utun PUBLIC ws2_32 iphlpapi advapi32 bcrypt dbghelp)
+endif()

tools/chatgui/zxing-cpp/docs/CMakeLists.txt

@@ -0,0 +1 @@
+