ovpncli: bring tunbuilder variant back to life

Signed-off-by: Lev Stipakov <lev@openvpn.net>

CMakePresets.json

@@ -49,6 +49,16 @@
                 "CMAKE_CXX_COMPILER": "/usr/bin/g++"
             }
         },
+        {
+            "name": "tunbuilder",
+            "hidden": true,
+            "cacheVariables": {
+                "CLI_TUNBUILDER": {
+                    "value": "ON",
+                    "type": "BOOL"
+                }
+            }
+        },
         {
             "name": "base-mingw",
             "hidden": true,
@@ -267,6 +277,14 @@
                 "base-linux",
                 "release"
             ]
+        },
+        {
+            "name": "linux-x64-debug-tunbuilder",
+            "inherits": [
+                "base-linux",
+                "debug",
+                "tunbuilder"
+            ]
         }
     ],
     "buildPresets": [
@@ -334,6 +352,11 @@
             "name": "linux-x64-release",
             "configurePreset": "linux-x64-release",
             "configuration": "Release"
+        },
+        {
+            "name": "linux-x64-debug-tunbuilder",
+            "configurePreset": "linux-x64-debug-tunbuilder",
+            "configuration": "Debug"
         }
     ],
     "testPresets": [

test/ovpncli/CMakeLists.txt

@@ -3,6 +3,7 @@ option(CLI_NULLTUN "Build ovpncli variant with null tun" OFF)
 option(CLI_KOVPN "Build ovpncli variant with kovpn kernel module support" OFF)
 option(CLI_OVPNDCO "Build ovpncli with ovpn-dco kernel module support" OFF)
 option(CLI_OVPNDCOWIN "Build ovpncli with ovpn-dco-win driver support" OFF)
+option(CLI_TUNBUILDER "Build ovpncli with tunbuilder interface support" OFF)
 
 set(KOVPN_SOURCE "${CORE_DIR}/../kovpn" CACHE PATH "ovpn-dco kernel module source tree")
 
@@ -76,3 +77,7 @@ if (APPLE)
     add_json_library(ovpncliagent)
     target_compile_definitions(ovpncliagent PRIVATE -DOPENVPN_COMMAND_AGENT)
 endif ()
+
+if (${CLI_TUNBUILDER})
+    target_compile_definitions(ovpncli PRIVATE USE_TUN_BUILDER)
+endif ()

test/ovpncli/cli.cpp

@@ -123,16 +123,12 @@ class ClientBase : public ClientAPI::OpenVPNClient
   public:
     bool tun_builder_new() override
     {
-        tbc.tun_builder_set_mtu(1500);
         return true;
     }
 
     int tun_builder_establish() override
     {
-        if (!tun)
+        tun.reset(new TUN_CLASS_SETUP());
-        {
-            tun.reset(new TUN_CLASS_SETUP());
-        }
 
         TUN_CLASS_SETUP::Config config;
         config.layer = Layer(Layer::Type::OSI_LAYER_3);
@@ -197,6 +193,16 @@ class ClientBase : public ClientAPI::OpenVPNClient
         return tun->add_bypass_route(remote, ipv6, os);
     }
 
+    bool tun_builder_add_dns_options(const DnsOptions &dns) override
+    {
+        return tbc.tun_builder_add_dns_options(dns);
+    }
+
+    bool tun_builder_set_mtu(int mtu) override
+    {
+        return tbc.tun_builder_set_mtu(mtu);
+    }
+
   private:
     TUN_CLASS_SETUP::Ptr tun = new TUN_CLASS_SETUP();
     TunBuilderCapture tbc;