[gui] add shared library with c interfaces for ffi

3rd-party/CMakeLists.txt

@@ -86,6 +86,7 @@ option(YAML_CPP_BUILD_CONTRIB OFF)
 option(YAML_CPP_BUILD_TESTS OFF)
 
 add_subdirectory(yaml-cpp EXCLUDE_FROM_ALL)
+set_target_properties(yaml-cpp PROPERTIES POSITION_INDEPENDENT_CODE ON)
 
 add_library(yaml INTERFACE)
 
@@ -121,6 +122,7 @@ set(BUILD_SHARED_LIBS OFF)
 add_subdirectory(semver EXCLUDE_FROM_ALL)
 target_include_directories(semver INTERFACE
   ${CMAKE_CURRENT_SOURCE_DIR}/semver/include)
+set_target_properties(semver PROPERTIES POSITION_INDEPENDENT_CODE ON)
 
 # xz-decoder config
 add_subdirectory(xz-decoder EXCLUDE_FROM_ALL)

include/multipass/dart_ffi.h

@@ -0,0 +1,18 @@
+#ifndef MULTIPASS_DART_FFI_H
+#define MULTIPASS_DART_FFI_H
+
+extern "C" const char* multipass_version();
+
+extern "C" const char* generate_petname();
+
+extern "C" const char* get_server_address();
+
+extern "C" struct KeyCertificatePair
+{
+    const char* pem_cert;
+    const char* pem_priv_key;
+};
+
+extern "C" struct KeyCertificatePair get_cert_pair();
+
+#endif // MULTIPASS_DART_FFI_H

src/client/desktop_gui/CMakeLists.txt

@@ -12,6 +12,15 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+add_library(dart_ffi SHARED ffi/dart_ffi.cpp)
+
+target_link_libraries(dart_ffi
+  petname
+  client_common
+)
+
+install(TARGETS dart_ffi LIBRARY COMPONENT multipass)
+
 if(NOT MULTIPASS_ENABLE_FLUTTER_GUI)
   return()
 endif()

src/client/desktop_gui/ffi/dart_ffi.cpp

@@ -0,0 +1,76 @@
+#include "multipass/dart_ffi.h"
+#include "multipass/cli/client_common.h"
+#include "multipass/format.h"
+#include "multipass/logging/log.h"
+#include "multipass/name_generator.h"
+#include "multipass/version.h"
+
+namespace mp = multipass;
+namespace mpc = multipass::client;
+namespace mpl = multipass::logging;
+
+constexpr auto category = "dart-ffi";
+
+extern "C" const char* multipass_version()
+{
+    return mp::version_string;
+}
+
+extern "C" const char* generate_petname()
+try
+{
+    static mp::NameGenerator::UPtr generator = mp::make_default_name_generator();
+    const auto name = generator->make_name();
+    return strdup(name.c_str());
+}
+catch (const std::exception& e)
+{
+    mpl::log(mpl::Level::warning, category, fmt::format("failed generating petname: {}", e.what()));
+    return nullptr;
+}
+catch (...)
+{
+    mpl::log(mpl::Level::warning, category, "failed generating petname");
+    return nullptr;
+}
+
+extern "C" const char* get_server_address()
+try
+{
+    const auto address = mpc::get_server_address();
+    return strdup(address.c_str());
+}
+catch (const std::exception& e)
+{
+    mpl::log(mpl::Level::warning, category, fmt::format("failed retrieving server address: {}", e.what()));
+    return nullptr;
+}
+catch (...)
+{
+    mpl::log(mpl::Level::warning, category, "failed retrieving server address");
+    return nullptr;
+}
+
+extern "C" struct KeyCertificatePair get_cert_pair()
+try
+{
+    const auto provider = mpc::get_cert_provider(mpc::get_server_address());
+    const auto cert = provider->PEM_certificate();
+    const auto key = provider->PEM_signing_key();
+    struct KeyCertificatePair pair
+    {
+    };
+    pair.pem_cert = strdup(cert.c_str());
+    pair.pem_priv_key = strdup(key.c_str());
+    return pair;
+}
+catch (const std::exception& e)
+{
+    mpl::log(mpl::Level::warning, category, fmt::format("failed retrieving certificate key pair: {}", e.what()));
+    return KeyCertificatePair{nullptr, nullptr};
+}
+catch (...)
+{
+    mpl::log(mpl::Level::warning, category, "failed retrieving certificate key pair");
+    return KeyCertificatePair{nullptr, nullptr};
+}