Fix bus error from boost socket.shutdown in tcp_socket_error() and li…

…nk statically to OpenSSL (#145)

* Fix bus error from boost socket.shutdown in tcp_socket_error()

Under MacOS (Darwin 23.1, arm64), building with Boost 1.81.0, localproxytest test-cases 'Test source mode" and 'Test source mode with client token' fail due to a bus error when calling connection->socket_.shutdown in tcp_adapter_proxy::tcp_socket_error. The exact same issue is triggered in localproxy, when a connection that's been setup through the tunnel, is subsequently closed (e.g. using SSH to login to the remote end and then logging out).

* Force static libs for OpenSSL

Update CMakeLists.txt to force linking with static versions of the OpenSSL libraries (libssl and libcrypto) when both static and share-object libs are available, in fashion similar to that used for Protobuf and Boost.

CMakeLists.txt

@@ -61,6 +61,9 @@ protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS ${PROJECT_SOURCE_DIR}/resources/Mess
 #########################################
 set(OPENSSL_USE_STATIC_LIBS TRUE)
 find_package(OpenSSL REQUIRED)
+include_directories(${OPENSSL_INCLUDE_DIR})
+string(REPLACE ${CMAKE_SHARED_LIBRARY_SUFFIX} ${CMAKE_STATIC_LIBRARY_SUFFIX} OpenSSL_STATIC_SSL_LIBRARY ${OPENSSL_SSL_LIBRARY})
+string(REPLACE ${CMAKE_SHARED_LIBRARY_SUFFIX} ${CMAKE_STATIC_LIBRARY_SUFFIX} OpenSSL_STATIC_CRYPTO_LIBRARY ${OPENSSL_CRYPTO_LIBRARY})
 
 #########################################
 # Test framework dependency             #
@@ -111,17 +114,17 @@ endif()
 include_directories(${PROJECT_SOURCE_DIR}/src)
 
 target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} ${CMAKE_THREAD_LIBS_INIT})
-target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} OpenSSL::SSL)
-target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} OpenSSL::Crypto)
+target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} ${OpenSSL_STATIC_SSL_LIBRARY})
+target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} ${OpenSSL_STATIC_CRYPTO_LIBRARY})
 target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} ${Boost_STATIC_LIBRARIES})
 target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} ${Protobuf_LITE_STATIC_LIBRARY})
 target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} ${CMAKE_DL_LIBS})
 set_property(TARGET ${AWS_TUNNEL_LOCAL_PROXY_TARGET_NAME} APPEND_STRING PROPERTY COMPILE_FLAGS ${CUSTOM_COMPILER_FLAGS})
 
 if(BUILD_TESTS)
     target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} ${CMAKE_THREAD_LIBS_INIT})
-    target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} OpenSSL::SSL)
-    target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} OpenSSL::Crypto)
+    target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} ${OpenSSL_STATIC_SSL_LIBRARY})
+    target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} ${OpenSSL_STATIC_CRYPTO_LIBRARY})
     target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} ${Boost_STATIC_LIBRARIES})
     target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} ${Protobuf_LITE_STATIC_LIBRARY})
     target_link_libraries(${AWS_TUNNEL_LOCAL_PROXY_TEST_NAME} ${CMAKE_DL_LIBS})

src/TcpAdapterProxy.cpp

@@ -511,7 +511,8 @@ namespace aws { namespace iot { namespace securedtunneling {
             BOOST_LOG_SEV(this->log, info) << "Disconnecting... remote endpoint not found";
         }
         connection->tcp_write_buffer_.consume(connection->tcp_write_buffer_.max_size());
-        connection->socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_receive);
+        // this works on Linux x86_64 but causes a bus error on Darwin arm64, commenting it out
+        //connection->socket_.shutdown(boost::asio::ip::tcp::socket::shutdown_receive);
         connection->socket_.close();
 
         connection->on_web_socket_write_buffer_drain_complete = [&, service_id, connection_id]()
@@ -2309,4 +2310,4 @@ namespace aws { namespace iot { namespace securedtunneling {
             return false;
         }
     }
-}}}
+}}}