1 files changed, 50 insertions, 0 deletions
diff --git a/src/transport/zerotier/CMakeLists.txt b/src/transport/zerotier/CMakeLists.txt
new file mode 100644
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+++ b/src/transport/zerotier/CMakeLists.txt
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+#
+# Copyright 2017 Garrett D'Amore <garrett@damore.org>
+# Copyright 2017 Capitar IT Group BV <info@capitar.com>
+#
+# This software is supplied under the terms of the MIT License, a
+# copy of which should be located in the distribution where this
+# file was obtained (LICENSE.txt).  A copy of the license may also be
+# found online at https://opensource.org/licenses/MIT.
+#
+
+# ZeroTier protocol
+
+set (NNG_TRANSPORT_ZEROTIER_SOURCE "" CACHE PATH "Location of ZeroTier source tree.")
+
+if (NNG_TRANSPORT_ZEROTIER)
+
+    # We use the libzerotiercore.a library, which is unfortunately a C++ object
+    # even though it exposes only public C symbols.  It would be extremely
+    # helpful if libzerotiercore didn't make us carry the whole C++ runtime
+    # behind us.  The user must specify the location of the ZeroTier source
+    # tree (dev branch for now, and already compiled please) by setting the
+    # NNG_ZEROTIER_SOURCE macro.
+    # NB: This needs to be the zerotierone tree, not the libzt library.
+    # This is because we don't access the API, but instead use the low
+    # level zerotiercore functionality directly.
+    # NB: As we wind up linking libzerotiercore.a into the application,
+    # this means that your application will *also* need to either be licensed
+    # under the GPLv3, or you will need to have a commercial license from
+    # ZeroTier permitting its use elsewhere.
+    
+    enable_language(CXX)
+    find_library(NNG_LIBZTCORE zerotiercore PATHS ${NNG_TRANSPORT_ZEROTIER_SOURCE})
+    if (NNG_LIBZTCORE)
+        set(CMAKE_REQUIRED_INCLUDES ${NNG_TRANSPORT_ZEROTIER_SOURCE}/include)
+        message(STATUS "C++ ${CMAKE_CXX_IMPLICIT_LINK_LIBRARIES}")
+        set(CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${NNG_LIBZTCORE} ${CMAKE_CXX_IMPLICIT_LINK_LIBRARIES})
+        set(NNG_REQUIRED_LIBRARIES ${NNG_REQUIRED_LIBRARIES} ${NNG_LIBZTCORE} ${CMAKE_CXX_IMPLICIT_LINK_LIBRARIES} PARENT_SCOPE)
+        set(NNG_REQUIRED_INCLUDES ${NNG_REQUIRED_INCLUDES} ${NNG_TRANSPORT_ZEROTIER_SOURCE}/include PARENT_SCOPE)
+        nng_check_sym(ZT_Node_join ZeroTierOne.h HAVE_ZTCORE)
+    endif()
+    if (NOT HAVE_ZTCORE)
+        message (FATAL_ERROR "Cannot find ZeroTier components")
+    endif()
+    message(STATUS "Found ZeroTier at ${NNG_LIBZTCORE}")
+
+    set(ZT_SOURCES transport/zerotier/zerotier.c transport/zerotier/zerotier.h)
+    install(FILES zerotier.h DESTINATION include/nng/transport/zerotier)
+endif()
+
+set(NNG_SOURCES ${NNG_SOURCES} ${ZT_SOURCES} PARENT_SCOPE)