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/ssl/CMakeLists.txt

@@ -0,0 +1,64 @@
+set(THREADS_USE_PTHREADS_WIN32 true)
+find_package(Threads)
+
+set(libs
+    mbedtls
+)
+
+set(targets
+    dtls_client
+    dtls_server
+    ssl_client1
+    ssl_client2
+    ssl_server
+    ssl_fork_server
+    ssl_mail_client
+    mini_client
+)
+
+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(dtls_client dtls_client.c)
+target_link_libraries(dtls_client ${libs})
+
+add_executable(dtls_server dtls_server.c)
+target_link_libraries(dtls_server ${libs})
+
+add_executable(ssl_client1 ssl_client1.c)
+target_link_libraries(ssl_client1 ${libs})
+
+add_executable(ssl_client2 ssl_client2.c)
+target_sources(ssl_client2 PUBLIC query_config.c)
+target_link_libraries(ssl_client2 ${libs})
+
+add_executable(ssl_server ssl_server.c)
+target_link_libraries(ssl_server ${libs})
+
+add_executable(ssl_server2 ssl_server2.c)
+target_sources(ssl_server2 PUBLIC query_config.c)
+target_link_libraries(ssl_server2 ${libs})
+
+add_executable(ssl_fork_server ssl_fork_server.c)
+target_link_libraries(ssl_fork_server ${libs})
+
+add_executable(ssl_mail_client ssl_mail_client.c)
+target_link_libraries(ssl_mail_client ${libs})
+
+add_executable(mini_client mini_client.c)
+target_link_libraries(mini_client ${libs})
+
+if(THREADS_FOUND)
+    add_executable(ssl_pthread_server ssl_pthread_server.c)
+    target_link_libraries(ssl_pthread_server ${libs} ${CMAKE_THREAD_LIBS_INIT})
+    set(targets ${targets} ssl_pthread_server)
+endif(THREADS_FOUND)
+
+install(TARGETS ${targets}
+        DESTINATION "bin"
+        PERMISSIONS OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE)