mbed TLS cmake support

FindMbedTLS.cmake is come from https://github.com/AVSystem/avs_commons/blob/master/cmake/FindMbedTLS.cmake, which is licensed under Apache 2.0

alternatives:
  https://github.com/curl/curl/blob/master/CMake/FindMbedTLS.cmake   without variable MBEDTLS_ROOT_DIR
  https://github.com/libgit2/libgit2/blob/master/cmake/Modules/FindmbedTLS.cmake  GPLv2 with a special Linking Exception

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 960e2e1e6c0fc83591e9db66dd649806092640f6..f3072aa4425c3322aaba769143c6cf842f2fcbaa 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -132,6 +132,9 @@ option(EVENT__DISABLE_THREAD_SUPPORT
 option(EVENT__DISABLE_OPENSSL
     "Define if libevent should build without support for OpenSSL encryption" OFF)
 
+option(EVENT__DISABLE_MBEDTLS
+    "Define if libevent should build without support for mbed TLS encryption" OFF)
+
 option(EVENT__DISABLE_BENCHMARK
     "Defines if libevent should build without the benchmark executables" OFF)
 
@@ -866,6 +869,21 @@ if (NOT EVENT__DISABLE_OPENSSL)
     list(APPEND LIB_APPS ${OPENSSL_LIBRARIES})
 endif()
 
+if (NOT EVENT__DISABLE_MBEDTLS)
+    find_package(MbedTLS REQUIRED)
+
+    set(EVENT__HAVE_MBEDTLS 1)
+
+    message(STATUS "mbed TLS include: ${MBEDTLS_INCLUDE_DIR}")
+    message(STATUS "mbed TLS lib: ${MBEDTLS_LIBRARIES}")
+
+    include_directories(${MBEDTLS_INCLUDE_DIR})
+
+    list(APPEND SRC_MBEDTLS bufferevent_mbedtls.c)
+    list(APPEND HDR_PUBLIC include/event2/bufferevent_ssl.h)
+    list(APPEND LIB_APPS ${MBEDTLS_LIBRARIES})
+endif()
+
 if (NOT EVENT__DISABLE_THREAD_SUPPORT)
     if (WIN32)
         list(APPEND SRC_CORE evthread_win32.c)
@@ -971,6 +989,12 @@ if (NOT EVENT__DISABLE_OPENSSL)
         SOURCES ${SRC_OPENSSL})
 endif()
 
+if (NOT EVENT__DISABLE_MBEDTLS)
+    add_event_library(event_mbedtls
+        LIBRARIES event_core_shared ${MBEDTLS_LIBRARIES}
+        SOURCES ${SRC_MBEDTLS})
+endif()
+
 if (EVENT__HAVE_PTHREADS)
     set(SRC_PTHREADS evthread_pthread.c)
     add_event_library(event_pthreads

diff --git a/cmake/FindMbedTLS.cmake b/cmake/FindMbedTLS.cmake
new file mode 100644 (file)
index 0000000..d82baa4
--- /dev/null
+++ b/cmake/FindMbedTLS.cmake
@@ -0,0 +1,159 @@
+# Copyright 2017-2019 AVSystem <avsystem@avsystem.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#.rst:
+# FindMbedTLS
+# -----------
+#
+# Find the mbedTLS encryption library.
+#
+# Imported Targets
+# ^^^^^^^^^^^^^^^^
+#
+# This module defines the following :prop_tgt:`IMPORTED` targets:
+#
+# ``mbedtls``
+#   The mbedTLS ``mbedtls`` library, if found.
+# ``mbedcrypto``
+#   The mbedtls ``crypto`` library, if found.
+# ``mbedx509``
+#   The mbedtls ``x509`` library, if found.
+#
+# Result Variables
+# ^^^^^^^^^^^^^^^^
+#
+# This module will set the following variables in your project:
+#
+# ``MBEDTLS_FOUND``
+#   System has the mbedTLS library.
+# ``MBEDTLS_INCLUDE_DIR``
+#   The mbedTLS include directory.
+# ``MBEDTLS_LIBRARY``
+#   The mbedTLS SSL library.
+# ``MBEDTLS_CRYPTO_LIBRARY``
+#   The mbedTLS crypto library.
+# ``MBEDTLS_X509_LIBRARY``
+#   The mbedTLS x509 library.
+# ``MBEDTLS_LIBRARIES``
+#   All mbedTLS libraries.
+# ``MBEDTLS_VERSION``
+#   This is set to ``$major.$minor.$patch``.
+# ``MBEDTLS_VERSION_MAJOR``
+#   Set to major mbedTLS version number.
+# ``MBEDTLS_VERSION_MINOR``
+#   Set to minor mbedTLS version number.
+# ``MBEDTLS_VERSION_PATCH``
+#   Set to patch mbedTLS version number.
+#
+# Hints
+# ^^^^^
+#
+# Set ``MBEDTLS_ROOT_DIR`` to the root directory of an mbedTLS installation.
+# Set ``MBEDTLS_USE_STATIC_LIBS`` to ``TRUE`` to look for static libraries.
+
+if(MBEDTLS_ROOT_DIR)
+    # Disable re-rooting paths in find_path/find_library.
+    # This assumes MBEDTLS_ROOT_DIR is an absolute path.
+    set(_EXTRA_FIND_ARGS "NO_CMAKE_FIND_ROOT_PATH")
+endif()
+
+find_path(MBEDTLS_INCLUDE_DIR
+          NAMES mbedtls/ssl.h
+          PATH_SUFFIXES include
+          HINTS ${MBEDTLS_ROOT_DIR}
+          ${_EXTRA_FIND_ARGS})
+
+# based on https://github.com/ARMmbed/mbedtls/issues/298
+if(MBEDTLS_INCLUDE_DIR AND EXISTS "${MBEDTLS_INCLUDE_DIR}/mbedtls/version.h")
+    file(STRINGS "${MBEDTLS_INCLUDE_DIR}/mbedtls/version.h" VERSION_STRING_LINE REGEX "^#define MBEDTLS_VERSION_STRING[ \\t\\n\\r]+\"[^\"]*\"$")
+    file(STRINGS "${MBEDTLS_INCLUDE_DIR}/mbedtls/version.h" VERSION_MAJOR_LINE REGEX "^#define MBEDTLS_VERSION_MAJOR[ \\t\\n\\r]+[0-9]+$")
+    file(STRINGS "${MBEDTLS_INCLUDE_DIR}/mbedtls/version.h" VERSION_MINOR_LINE REGEX "^#define MBEDTLS_VERSION_MINOR[ \\t\\n\\r]+[0-9]+$")
+    file(STRINGS "${MBEDTLS_INCLUDE_DIR}/mbedtls/version.h" VERSION_PATCH_LINE REGEX "^#define MBEDTLS_VERSION_PATCH[ \\t\\n\\r]+[0-9]+$")
+
+    string(REGEX REPLACE "^#define MBEDTLS_VERSION_STRING[ \\t\\n\\r]+\"([^\"]*)\"$" "\\1" MBEDTLS_VERSION "${VERSION_STRING_LINE}")
+    string(REGEX REPLACE "^#define MBEDTLS_VERSION_MAJOR[ \\t\\n\\r]+([0-9]+)$" "\\1" MBEDTLS_VERSION_MAJOR "${VERSION_MAJOR_LINE}")
+    string(REGEX REPLACE "^#define MBEDTLS_VERSION_MINOR[ \\t\\n\\r]+([0-9]+)$" "\\1" MBEDTLS_VERSION_MINOR "${VERSION_MINOR_LINE}")
+    string(REGEX REPLACE "^#define MBEDTLS_VERSION_PATCH[ \\t\\n\\r]+([0-9]+)$" "\\1" MBEDTLS_VERSION_PATCH "${VERSION_PATCH_LINE}")
+endif()
+
+
+if(MBEDTLS_USE_STATIC_LIBS)
+    set(_MBEDTLS_LIB_NAME libmbedtls.a)
+    set(_MBEDTLS_CRYPTO_LIB_NAME libmbedcrypto.a)
+    set(_MBEDTLS_X509_LIB_NAME libmbedx509.a)
+else()
+    set(_MBEDTLS_LIB_NAME mbedtls)
+    set(_MBEDTLS_CRYPTO_LIB_NAME mbedcrypto)
+    set(_MBEDTLS_X509_LIB_NAME mbedx509)
+endif()
+
+find_library(MBEDTLS_LIBRARY
+             NAMES ${_MBEDTLS_LIB_NAME}
+             PATH_SUFFIXES lib
+             HINTS ${MBEDTLS_ROOT_DIR}
+             ${_EXTRA_FIND_ARGS})
+
+find_library(MBEDTLS_CRYPTO_LIBRARY
+             NAMES ${_MBEDTLS_CRYPTO_LIB_NAME}
+             PATH_SUFFIXES lib
+             HINTS ${MBEDTLS_ROOT_DIR}
+             ${_EXTRA_FIND_ARGS})
+
+find_library(MBEDTLS_X509_LIBRARY
+             NAMES ${_MBEDTLS_X509_LIB_NAME}
+             PATH_SUFFIXES lib
+             HINTS ${MBEDTLS_ROOT_DIR}
+             ${_EXTRA_FIND_ARGS})
+
+set(MBEDTLS_LIBRARIES ${MBEDTLS_LIBRARY} ${MBEDTLS_CRYPTO_LIBRARY} ${MBEDTLS_X509_LIBRARY})
+
+if(MBEDTLS_INCLUDE_DIR)
+    set(MBEDTLS_FOUND TRUE)
+endif()
+
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(mbedTLS
+                                  FOUND_VAR MBEDTLS_FOUND
+                                  REQUIRED_VARS
+                                      MBEDTLS_INCLUDE_DIR
+                                      MBEDTLS_LIBRARY
+                                      MBEDTLS_CRYPTO_LIBRARY
+                                      MBEDTLS_X509_LIBRARY
+                                      MBEDTLS_LIBRARIES
+                                      MBEDTLS_VERSION
+                                  VERSION_VAR MBEDTLS_VERSION)
+
+
+if(NOT TARGET mbedtls)
+    add_library(mbedtls UNKNOWN IMPORTED)
+    set_target_properties(mbedtls PROPERTIES
+                          INTERFACE_INCLUDE_DIRECTORIES "${MBEDTLS_INCLUDE_DIR}"
+                          IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+                          IMPORTED_LOCATION "${MBEDTLS_LIBRARY}")
+endif()
+
+if(NOT TARGET mbedcrypto)
+    add_library(mbedcrypto UNKNOWN IMPORTED)
+    set_target_properties(mbedcrypto PROPERTIES
+                          IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+                          IMPORTED_LOCATION "${MBEDTLS_CRYPTO_LIBRARY}")
+endif()
+
+if(NOT TARGET mbedx509)
+    add_library(mbedx509 UNKNOWN IMPORTED)
+    set_target_properties(mbedx509 PROPERTIES
+                          IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+                          IMPORTED_LOCATION "${MBEDTLS_X509_LIBRARY}")
+endif()