cmake: add openvpn3 support

CMakeLists.txt

@@ -1,3 +1,5 @@
+option(CLI_OVPN3 "Build ${PROJECT_NAME} with OpenVPN3 support" OFF)
+
 cmake_minimum_required(VERSION 3.10)
 
 if(NOT VCPKG_MANIFEST_DIR)
@@ -32,7 +34,7 @@ find_package(OpenSSL REQUIRED)
 
 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DDEBUG")
 
-target_link_libraries(${PROJECT_NAME}
+target_link_libraries(${PROJECT_NAME} PRIVATE
     OpenSSL::SSL
     Wtsapi32.lib
     Netapi32.lib
@@ -71,6 +73,16 @@ target_compile_definitions(${PROJECT_NAME} PRIVATE
     WIN32_LEAN_AND_MEAN
     HAVE_CONFIG_H)
 
+if (${CLI_OVPN3})
+    find_package(json-c REQUIRED)
+
+    target_link_libraries(${PROJECT_NAME} PRIVATE
+        json-c::json-c)
+
+    target_compile_definitions(${PROJECT_NAME} PRIVATE
+        ENABLE_OVPN3)
+endif ()
+
 if(MSVC)
     # work around msvc generator Debug/Release directory ugliness, doesn't apply for Ninja
     set_target_properties(${PROJECT_NAME} PROPERTIES

vcpkg_manifests/openssl_1.1.1/vcpkg.json

@@ -2,7 +2,8 @@
   "name": "openvpn-gui",
   "version-string": "0.0.1",
   "dependencies": [
-    "openssl"
+    "openssl",
+    "json-c"
   ],
   "builtin-baseline": "4b766c1cd17205e1b768c4fadfd5f867c1d0510e",
   "overrides": [

vcpkg_manifests/openssl_3/vcpkg.json

@@ -2,6 +2,7 @@
   "name": "openvpn-gui",
   "version-string": "0.0.1",
   "dependencies": [
-    "openssl"
+    "openssl",
+    "json-c"
   ]
 }