fixes #1005 TLS 1.3 support

This introduces support for an external wolfSSL plugin, and generally
creates the framework for pluggable TLS implementations.

The wolfSSL engine is provided via an external module (git submodule),
available either under a GPLv3 license or a commercial license.

1 files changed, 34 insertions, 33 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d71e72b9..9685713b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@
 #   IN THE SOFTWARE.
 #
 
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.13)
 
 project(nng C)
 include(CheckFunctionExists)
@@ -45,6 +45,9 @@ if (POLICY CMP0042)
     # Newer cmake on MacOS should use @rpath
     cmake_policy(SET CMP0042 NEW)
 endif ()
+if (POLICY CMP0079)
+    cmake_policy(SET CMP0079 NEW)
+endif ()
 
 if (POLICY CMP0028)
     # Double colon targets are only alias or imports.
@@ -70,7 +73,7 @@ set(NNG_MINOR_VERSION ${CMAKE_MATCH_1})
 string(REGEX MATCH "NNG_PATCH_VERSION ([0-9]*)" _ ${nng_ver_h})
 set(NNG_PATCH_VERSION ${CMAKE_MATCH_1})
 string(REGEX MATCH "NNG_RELEASE_SUFFIX \"([a-z0-9]*)\"" _ ${nng_ver_h})
-if (NOT(${CMAKE_MATCH_1} STREQUAL ""))
+if (NOT (${CMAKE_MATCH_1} STREQUAL ""))
     set(NNG_PRERELEASE "-${CMAKE_MATCH_1}")
 endif ()
 
@@ -91,11 +94,14 @@ endif ()
 
 # We only build command line tools and tests if we are not in a
 # cross-compile situation.  Cross-compiling users who still want to
-# build these must enable them explicitly.
+# build these must enable them explicitly.  Some of these switches
+# must be enabled rather early as we use their values later.
 option(NNG_TESTS "Build and run tests" ${NNG_NATIVE_BUILD})
 option(NNG_TOOLS "Build extra tools" ${NNG_NATIVE_BUILD})
 option(NNG_ENABLE_NNGCAT "Enable building nngcat utility." ${NNG_TOOLS})
 option(NNG_ENABLE_COVERAGE "Enable coverage reporting." OFF)
+
+
 # Enable access to private APIs for our own use.
 add_definitions(-DNNG_PRIVATE)
 
@@ -103,7 +109,8 @@ add_definitions(-DNNG_PRIVATE)
 # that have too small defaults.  This is not used for Windows,
 # which can grow thread stacks sensibly.  (Note that NNG can get
 # by with a smallish stack, but application callbacks might require
-# larger values if using aio completion callbacks.)
+# larger values if using aio completion callbacks.  TLS libraries may
+# require larger stacks however.)
 if (NOT WIN32)
     option(NNG_SETSTACKSIZE "Use rlimit for thread stack size" OFF)
     if (NNG_SETSTACKSIZE)
@@ -112,12 +119,6 @@ if (NOT WIN32)
     mark_as_advanced(NNG_SETSTACKSIZE)
 endif ()
 
-option(NNG_ENABLE_TLS "Enable TLS protocol (requires mbedTLS)" OFF)
-if (NNG_ENABLE_TLS)
-    add_definitions(-DNNG_SUPP_TLS)
-    set(NNG_SUPP_TLS ON)
-endif ()
-
 option(NNG_ENABLE_STATS "Enable statistics" ON)
 if (NNG_ENABLE_STATS)
     add_definitions(-DNNG_ENABLE_STATS)
@@ -358,9 +359,10 @@ endif ()
 if (NNG_TESTS)
     enable_testing()
     set(all_tests, "")
+endif ()
 
-
-    macro(nng_test NAME)
+macro(nng_test NAME)
+    if (NNG_TESTS)
         add_executable(${NAME} ${NAME}.c ${ARGN})
         target_link_libraries(${NAME} ${PROJECT_NAME}_testlib)
         target_include_directories(${NAME} PRIVATE
@@ -369,37 +371,30 @@ if (NNG_TESTS)
                 ${PROJECT_SOURCE_DIR}/include)
         add_test(NAME ${NAME} COMMAND ${NAME} -t)
         set_tests_properties(${NAME} PROPERTIES TIMEOUT 180)
-    endmacro()
+    endif ()
+endmacro()
 
-    function(nng_sources_testlib)
+function(nng_sources_testlib)
+    if (NNG_TESTS)
         foreach (f ${ARGN})
             target_sources(${PROJECT_NAME}_testlib PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/${f})
         endforeach ()
-    endfunction()
+    endif ()
+endfunction()
 
-    function(nng_headers_testlib)
+function(nng_headers_testlib)
+    if (NNG_TESTS)
         foreach (f ${ARGN})
             target_sources(${PROJECT_NAME}_testlib PRIVATE ${PROJECT_SOURCE_DIR}/include/${f})
         endforeach ()
-    endfunction()
+    endif ()
+endfunction()
 
-    function(nng_defines_testlib)
+function(nng_defines_testlib)
+    if (NNG_TESTS)
         target_compile_definitions(${PROJECT_NAME}_testlib PRIVATE ${ARGN})
-    endfunction()
-
-else ()
-    function(nng_test NAME)
-    endfunction()
-
-    function(nng_sources_testlib)
-    endfunction()
-
-    function(nng_headers_testlib)
-    endfunction()
-
-    function(nng_defines_testlib)
-    endfunction()
-endif ()
+    endif ()
+endfunction()
 
 function(nng_sources)
     foreach (f ${ARGN})
@@ -467,6 +462,12 @@ if (NNG_ENABLE_NNGCAT)
     add_subdirectory(tools/nngcat)
 endif ()
 
+option(NNG_ENABLE_TLS "Enable TLS protocol" OFF)
+if (NNG_ENABLE_TLS)
+    add_definitions(-DNNG_SUPP_TLS)
+    set(NNG_SUPP_TLS ON)
+endif ()
+
 add_subdirectory(docs/man)
 
 set(CPACK_PACKAGE_NAME ${PROJECT_NAME})