Feature/mbedtls (#84)

* try to import mbedtls and build it

* add stubs socket class

* some boilterplate, read and write function implemented

* more boilterplate / current error in handshake because no CA cert is setup

* add something so skip ca verification, can ws curl https://google.com !

* cleanup / close implemented

* tweak CMakefiles

* typo in include

* update readme

* disable unittests

third_party/mbedtls/programs/test/CMakeLists.txt

@@ -0,0 +1,36 @@
+set(libs
+    mbedtls
+)
+
+if(USE_PKCS11_HELPER_LIBRARY)
+    set(libs ${libs} pkcs11-helper)
+endif(USE_PKCS11_HELPER_LIBRARY)
+
+if(ENABLE_ZLIB_SUPPORT)
+    set(libs ${libs} ${ZLIB_LIBRARIES})
+endif(ENABLE_ZLIB_SUPPORT)
+
+add_executable(selftest selftest.c)
+target_link_libraries(selftest ${libs})
+
+add_executable(benchmark benchmark.c)
+target_link_libraries(benchmark ${libs})
+
+if(TEST_CPP)
+    add_executable(cpp_dummy_build cpp_dummy_build.cpp)
+    target_link_libraries(cpp_dummy_build ${libs})
+endif()
+
+add_executable(udp_proxy udp_proxy.c)
+target_link_libraries(udp_proxy ${libs})
+
+add_executable(zeroize zeroize.c)
+target_link_libraries(zeroize ${libs})
+
+add_executable(query_compile_time_config query_compile_time_config.c)
+target_sources(query_compile_time_config PUBLIC ../ssl/query_config.c)
+target_link_libraries(query_compile_time_config ${libs})
+
+install(TARGETS selftest benchmark udp_proxy query_compile_time_config
+        DESTINATION "bin"
+        PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)