provide a way to handle custom openssl paths (#179)

Author: Xavrax

.github/workflows/release/versions.json

@@ -7,6 +7,6 @@
     { "pattern": "#define PUBNUB_SDK_VERSION \"(.+)\"$", "cleared": true }
   ],
   "CMakeLists.txt": [
-    { "pattern": "^version(\"(.+)\")$", "cleared": true }
+    { "pattern": "project(c-core VERSION ((.+))$", "cleared": true }
   ]
 }

CMakeLists.txt

@@ -69,7 +69,9 @@ num_option(USE_IPV6 "Use IPv6 [CALLBACK=ON]" ${DEFAULT_USE_CALLBACK_API})
 num_option(USE_SET_DNS_SERVERS "Use set DNS servers [CALLBACK=ON]" ${DEFAULT_USE_CALLBACK_API})
 num_option(USE_EXTERN_API "Use extern C API [WITH_CPP=ON]" ON)
 num_option(USE_LEGACY_CRYPTO_RANDOM_IV "Use random IV for legacy crypto module [OpenSSL only]" ON)
-log_set(OPENSSL_ROOT_DIR "" "OpenSSL root directory (leave empty for find_package function)[OPENSSL=ON needed]")
+log_set(OPENSSL_ROOT_DIR "" "OpenSSL root directory (leave empty for find_package() defaults)[OPENSSL=ON needed]")
+log_set(CUSTOM_OPENSSL_LIB_DIR "lib" "OpenSSL lib directory relative to OPENSSL_ROOT_DIR [used only if find_package() failed]")
+log_set(CUSTOM_OPENSSL_INCLUDE_DIR "include" "OpenSSL include directory relative to OPENSSL_ROOT_DIR [used only if find_package() failed]")
 log_set(EXAMPLE "all" "Build example with provided name (use 'all' for all examples) [EXAMPLES=ON needed]")
 log_set(CGREEN_ROOT_DIR "${CMAKE_CURRENT_LIST_DIR}/cgreen" "CGreen root directory [UNIT_TEST=ON needed]")
 log_set(LOG_LEVEL "WARNING" "Log level [TRACE/WARNING/INFO/ERROR/FATAL]")
@@ -153,13 +155,18 @@ set(CORE_SOURCEFILES
 set(LIB_SOURCEFILES
     ${CMAKE_CURRENT_LIST_DIR}/lib/sockets/pbpal_resolv_and_connect_sockets.c
     ${CMAKE_CURRENT_LIST_DIR}/lib/sockets/pbpal_handle_socket_error.c
-    ${CMAKE_CURRENT_LIST_DIR}/lib/md5/md5.c
     ${CMAKE_CURRENT_LIST_DIR}/lib/base64/pbbase64.c
     ${CMAKE_CURRENT_LIST_DIR}/lib/pb_strnlen_s.c
     ${CMAKE_CURRENT_LIST_DIR}/lib/pb_strncasecmp.c
     ${CMAKE_CURRENT_LIST_DIR}/lib/sockets/pbpal_adns_sockets.c
     ${CMAKE_CURRENT_LIST_DIR}/lib/pubnub_dns_codec.c)
 
+if(NOT ${OPENSSL})
+    set(LIB_SOURCEFILES
+        ${LIB_SOURCEFILES}
+        ${CMAKE_CURRENT_LIST_DIR}/lib/md5/md5.c)
+endif()
+
 if(UNIX)
     set(LDLIBS "-lpthread ${LDLIBS}")
     set(OS_SOURCEFILES
@@ -342,8 +349,29 @@ if(${OPENSSL})
 
     if("${OPENSSL_ROOT_DIR}" STREQUAL "")
         find_package(OpenSSL REQUIRED)
+        set(OPENSSL_LINK_LIBRARIES OpenSSL::SSL OpenSSL::Crypto)
     else()
-        find_package(OpenSSL REQUIRED PATHS ${OPENSSL_ROOT_DIR})
+        find_package(OpenSSL PATHS ${OPENSSL_ROOT_DIR})
+        if(OpenSSl_FOUND)
+            set(OPENSSL_LINK_LIBRARIES OpenSSL::SSL OpenSSL::Crypto)
+        else()
+            message(STATUS "Searching for custom OpenSSL library")
+
+            find_library(OpenSSL REQUIRED NAMES ssl PATHS ${OPENSSL_ROOT_DIR}/${CUSTOM_OPENSSL_LIB_DIR} NO_DEFAULT_PATH)
+            find_library(Crypto REQUIRED NAMES crypto PATHS ${OPENSSL_ROOT_DIR}/${CUSTOM_OPENSSL_LIB_DIR} NO_DEFAULT_PATH)
+
+            message(STATUS "Used libraries:")
+            message(STATUS "-> ${OpenSSL}")
+            message(STATUS "-> ${Crypto}")
+
+            set(OPENSSL_LINK_LIBRARIES ${OpenSSL} ${Crypto})
+            include_directories(${OPENSSL_ROOT_DIR}/${CUSTOM_OPENSSL_INCLUDE_DIR})
+
+            message(STATUS "Used headers:")
+            message(STATUS "-> ${OPENSSL_ROOT_DIR}/${CUSTOM_OPENSSL_INCLUDE_DIR}")
+
+            message(STATUS "OpenSSL ready!")
+        endif()
     endif()
 
     set(FEATURE_SOURCEFILES 
@@ -370,7 +398,6 @@ if(${OPENSSL})
         ${FEATURE_SOURCEFILES})
 
     set(LDLIBS  ${LDLIBS})
-    set(OPENSSL_LINK_LIBRARIES OpenSSL::SSL OpenSSL::Crypto)
 
     if(UNIX)
         set(FEATURE_SOURCEFILES ${FEATURE_SOURCEFILES} ${CMAKE_CURRENT_LIST_DIR}/openssl/pbpal_add_system_certs_posix.c)

unreal/README.md

@@ -15,8 +15,10 @@ cmake . && make
 C-core offers some customization flags (e.g. shared library or using openssl). You can configure that as follow:
 
 ```sh 
-cmake . -DSHARED=ON -DOPENSSL=ON -DOPENSSL_ROOT_DIR={unreal engine location}/Engine/Source/ThirdParty/openssl/1.1.1/
+cmake . -DSHARED=ON -DOPENSSL=ON -DOPENSSL_ROOT_DIR={unreal engine location}/Engine/Source/ThirdParty/openssl/1.1.1x/ -DCUSTOM_OPENSSL_LIB_DIR=lib/XXX/ -DCUSTOM_OPENSSL_INCLUDE_DIR=include/XXX/
 ```
+
+where x is UE's version and XXX is your desired architecture. 
 
 3. Adjust `PubNubModule/PubNubModule.Build.cs` with selected options by changing `OpenSsl`, `StaticLink` and `BuildLocation` with the same values you used for compilation.