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Switch the CMake TinyDTLS build to the native way #1777

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Merged
mrdeep1 merged 1 commit into from
Oct 17, 2025
Merged

Switch the CMake TinyDTLS build to the native way #1777

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261 changes: 68 additions & 193 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -108,21 +108,21 @@ set(DTLS_BACKEND
STRING
"\
Name of the dtls backend, only relevant if `ENABLE_DTLS` is ON which is default. \
Possible values: default, gnutls, openssl, wolfssl, tinydtls and mbedtls. \
Possible values: default, gnutls, openssl, wolfssl, mbedtls and tinydtls. \
If specified then this library will be searched and if found also used. \
If not found then the cmake configuration will stop with an error. \
If not specified, then cmake will try to use the first one found in the following order: \
gnutls, openssl, wolfssl, tinydtls, mbedtls \
gnutls, openssl, wolfssl, mbedtls, tinydtls \
")
set_property(
CACHE DTLS_BACKEND
PROPERTY STRINGS
default
gnutls
openssl
wolfssl
gnutls
tinydtls
mbedtls)
mbedtls
tinydtls)
option(
USE_VENDORED_TINYDTLS
"compile with the tinydtls project in the submodule if on, otherwise try to find the compiled lib with find_package"
Expand Down Expand Up @@ -460,213 +460,95 @@ set(WITH_TINYDTLS OFF)
set(WITH_MBEDTLS OFF)
set(WITH_WOLFSSL OFF)

function(compile_tinydtls)
set(TINYDTLS_SOURCES_DIR ${CMAKE_CURRENT_LIST_DIR}/ext/tinydtls)
set(TINYDTLS_SOURCES_GENERATED ${TINYDTLS_SOURCES_DIR}/dtls_config.h)

message(STATUS "compiling the tinydtls lib")

include(ExternalProject)

externalproject_add(
external_tinydtls
SOURCE_DIR "${TINYDTLS_SOURCES_DIR}"
BUILD_IN_SOURCE 1
DOWNLOAD_COMMAND ""
UPDATE_COMMAND ""
CONFIGURE_COMMAND
${TINYDTLS_SOURCES_DIR}/configure
--disable-manpages
--prefix=${CMAKE_BINARY_DIR}
BUILD_COMMAND make install
INSTALL_COMMAND ""
LOG_DOWNLOAD 1
LOG_CONFIGURE 1)

externalproject_add_step(
external_tinydtls autoreconf
COMMAND ./autogen.sh
ALWAYS 1
WORKING_DIRECTORY "${TINYDTLS_SOURCES_DIR}"
DEPENDERS configure
DEPENDEES download)

# Let cmake know that it needs to execute the external_tinydtls target to generate those files.
add_custom_command(
OUTPUT ${TINYDTLS_SOURCES_GENERATED}
WORKING_DIRECTORY "${TINYDTLS_SOURCES_DIR}"
COMMAND "make install"
DEPENDS external_tinydtls)

add_dependencies(${COAP_LIBRARY_NAME} external_tinydtls)

if(BUILD_SHARED_LIBS)
set(LIBTINYDTLS_PATH "${CMAKE_CURRENT_BINARY_DIR}/lib/libtinydtls.so")
else()
set(LIBTINYDTLS_PATH "${CMAKE_CURRENT_BINARY_DIR}/lib/libtinydtls.a")
endif()

add_library(
tinydtls
UNKNOWN
IMPORTED)
set_target_properties(
tinydtls
PROPERTIES "${CMAKE_CURRENT_BINARY_DIR}/include"
INTERFACE_INCLUDE_DIRECTORIES
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${LIBTINYDTLS_PATH}")

endfunction()

if(ENABLE_DTLS)
message(STATUS "compiling with DTLS support")
message(STATUS "DTLS_BACKEND: ${DTLS_BACKEND}")

if(DTLS_BACKEND
STREQUAL
"default")
set(DTLS_FOUND OFF)
if(DTLS_BACKEND STREQUAL "default")
# try to find a crypto lib and use it, use the first one found
set(DTLS_REQUIRED "")
else()
set(DTLS_REQUIRED REQUIRED)
endif()

if((DTLS_BACKEND STREQUAL "gnutls") OR ((DTLS_BACKEND STREQUAL "default") AND (NOT DTLS_FOUND)))
# libgnutls (e.g. debian libgnutls28-dev)
find_package(GnuTLS)
find_package(GnuTLS ${DTLS_REQUIRED})
if(GnuTLS_FOUND)
set(WITH_GNUTLS ON)
message(STATUS "compiling with gnutls support")
set(COAP_WITH_LIBGNUTLS 1)
else()
# gnutls not found
find_package(OpenSSL)
if(OpenSSL_FOUND)
set(WITH_OPENSSL ON)
message(STATUS "compiling with openssl support")
set(COAP_WITH_LIBOPENSSL 1)
else()
# openssl not found
# wolfSSL
find_package(wolfSSL)
if(wolfSSL_FOUND)
set(WITH_WOLFSSL ON)
message(STATUS "compiling with wolfssl support")
set(COAP_WITH_LIBWOLFSSL 1)
else()
# wolfssl not found
# libmbedtls (e.g. debian libmbedtls-dev)
find_package(MbedTLS)
if(MbedTLS_FOUND)
set(WITH_MBEDTLS ON)
message(STATUS "compiling with mbedtls support")
set(COAP_WITH_LIBMBEDTLS 1)
else()
# mbedtls not found
if(USE_VENDORED_TINYDTLS)
compile_tinydtls()
else()
find_package(TinyDTLS)
if(TINYDTLS_FOUND)

else()
# no cryto lib found
message(
FATAL_ERROR
"cannot find any cryto lib, either install one or compile without DTLS support"
)
endif()

endif()

set(WITH_TINYDTLS ON)
message(STATUS "compiling with tinydtls support")
set(COAP_WITH_LIBTINYDTLS 1)

endif()

endif()

endif()

endif()

else()
# DTLS_BACKEND variable is not empty, so set all to false and set the only right to true
set(WITH_GNUTLS OFF)
set(WITH_TINYDTLS OFF)
set(WITH_MBEDTLS OFF)
set(WITH_OPENSSL OFF)
set(WITH_WOLFSSL OFF)

if(DTLS_BACKEND
STREQUAL
"gnutls")
# libgnutls (e.g. debian libgnutls28-dev)
find_package(GnuTLS REQUIRED)
set(WITH_GNUTLS ON)
message(STATUS "compiling with gnutls support")
set(COAP_WITH_LIBGNUTLS 1)
set(DTLS_FOUND ON)
endif()
endif()

if(DTLS_BACKEND
STREQUAL
"openssl")
# libssl (e.g. debian libssl1.0-dev)
find_package(OpenSSL REQUIRED)
if((DTLS_BACKEND STREQUAL "openssl") OR ((DTLS_BACKEND STREQUAL "default") AND (NOT DTLS_FOUND)))
# libssl (e.g. debian libssl1.0-dev)
find_package(OpenSSL ${DTLS_REQUIRED})
if(OpenSSL_FOUND)
set(WITH_OPENSSL ON)
message(STATUS "compiling with openssl support")
set(COAP_WITH_LIBOPENSSL 1)
set(DTLS_FOUND ON)
endif()
endif()

if(DTLS_BACKEND
STREQUAL
"wolfssl")
find_package(wolfSSL REQUIRED)
if((DTLS_BACKEND STREQUAL "wolfssl") OR ((DTLS_BACKEND STREQUAL "default") AND (NOT DTLS_FOUND)))
# wolfSSL
find_package(wolfssl ${DTLS_REQUIRED})
if(wolfssl_FOUND)
set(WITH_WOLFSSL ON)
message(STATUS "compiling with wolfssl support")
set(COAP_WITH_LIBWOLFSSL 1)
set(DTLS_FOUND ON)
endif()
endif()

if(DTLS_BACKEND
STREQUAL
"mbedtls")
# libmbedtls (e.g. debian libmbedtls-dev)
find_package(MbedTLS REQUIRED)
if((DTLS_BACKEND STREQUAL "mbedtls") OR ((DTLS_BACKEND STREQUAL "default") AND (NOT DTLS_FOUND)))
# libmbedtls (e.g. debian libmbedtls-dev)
find_package(MbedTLS ${DTLS_REQUIRED})
if(MbedTLS_FOUND)
set(WITH_MBEDTLS ON)
message(STATUS "compiling with mbedtls support")
set(COAP_WITH_LIBMBEDTLS 1)
set(DTLS_FOUND ON)
endif()
endif()

if(DTLS_BACKEND
STREQUAL
"tinydtls")

if(USE_VENDORED_TINYDTLS)
compile_tinydtls()
else(USE_VENDORED_TINYDTLS)
find_package(TinyDTLS REQUIRED)
endif(USE_VENDORED_TINYDTLS)

message(STATUS "compiling with tinydtls support")
if((DTLS_BACKEND STREQUAL "tinydtls") OR ((DTLS_BACKEND STREQUAL "default") AND (NOT DTLS_FOUND)))
if(USE_VENDORED_TINYDTLS)
message(STATUS "compiling the tinydtls lib")
add_subdirectory("ext/tinydtls")
set_target_properties(
tinydtls
PROPERTIES
# for #include <tinydtls/tinydtls.h>; #include "dtls_config.h"; #include "tinydtls.h"
INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_SOURCE_DIR}/ext;${tinydtls_BINARY_DIR};${tinydtls_SOURCE_DIR}"
IMPORTED_LINK_INTERFACE_LANGUAGES "C"
IMPORTED_LOCATION "${tinydtls_BINARY_DIR}")
add_library(TinyDTLS::tinydtls ALIAS tinydtls)
set(TinyDTLS_FOUND TRUE)
get_target_property(TinyDTLS_VERSION tinydtls VERSION)
else()
find_package(TinyDTLS ${DTLS_REQUIRED})
endif()
if(TinyDTLS_FOUND)
set(WITH_TINYDTLS ON)
message(STATUS "compiling with tinydtls support")
set(COAP_WITH_LIBTINYDTLS 1)

set(DTLS_FOUND ON)
endif()

endif()

endif()

if(WITH_WOLFSSL)
if(NOT ZEPHYR_BASE)
find_library(WOLFSSL_LIBRARY wolfssl HINTS /usr/local/lib)
find_path(WOLFSSL_INCLUDE_DIR wolfssl/wolfcrypt/settings.h HINTS /usr/local/include)
if(WOLFSSL_LIBRARY AND WOLFSSL_INCLUDE_DIR)
message(STATUS "compiling with wolfssl support")
else()
message(FATAL_ERROR "WolfSSL not found")
endif()
else()
# Zephyr handles wolfSSL configuration via zephyr/CMakeLists.txt
message(STATUS "compiling with wolfssl support (Zephyr)")
if((DTLS_BACKEND STREQUAL "default") AND (NOT DTLS_FOUND))
# no cryto lib found
message(
FATAL_ERROR
"cannot find any cryto lib, either install one or compile without DTLS support"
)
endif()

endif()

execute_process(COMMAND git describe --tags --dirty --always
Expand Down Expand Up @@ -847,23 +729,16 @@ target_include_directories(
$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/>
$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include/>
$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include/>
$<INSTALL_INTERFACE:include/>
$<BUILD_INTERFACE:$<$<AND:$<BOOL:${COAP_WITH_LIBTINYDTLS}>,$<BOOL:${USE_VENDORED_TINYDTLS}>>:${CMAKE_BINARY_DIR}/include/tinydtls>>
$<$<BOOL:${COAP_WITH_LIBGNUTLS}>:${GNUTLS_INCLUDE_DIR}>
$<$<BOOL:${COAP_WITH_LIBMBEDTLS}>:${MBEDTLS_INCLUDE_DIRS}>
$<$<BOOL:${COAP_WITH_LIBWOLFSSL}>:${WOLFSSL_INCLUDE_DIR}>)
$<INSTALL_INTERFACE:include/>)
target_link_libraries(
${COAP_LIBRARY_NAME}
PUBLIC $<$<BOOL:${COAP_WITH_LIBOPENSSL}>:OpenSSL::SSL>
$<$<BOOL:${COAP_WITH_LIBOPENSSL}>:OpenSSL::Crypto>
$<$<BOOL:${COAP_WITH_LIBGNUTLS}>:${GNUTLS_LIBRARIES}>
$<$<BOOL:${COAP_WITH_LIBTINYDTLS}>:tinydtls>
$<$<BOOL:${COAP_WITH_LIBMBEDTLS}>:${MBEDTLS_LIBRARY}>
$<$<BOOL:${COAP_WITH_LIBMBEDTLS}>:${MBEDX509_LIBRARY}>
$<$<BOOL:${COAP_WITH_LIBMBEDTLS}>:${MBEDCRYPTO_LIBRARY}>
$<$<BOOL:${COAP_WITH_LIBWOLFSSL}>:${WOLFSSL_LIBRARY}>
$<$<BOOL:${MINGW}>:ws2_32>
$<$<BOOL:${MINGW}>:iphlpapi>)
$<$<BOOL:${COAP_WITH_LIBGNUTLS}>:GnuTLS::GnuTLS>
$<$<BOOL:${COAP_WITH_LIBTINYDTLS}>:TinyDTLS::tinydtls>
$<$<BOOL:${COAP_WITH_LIBMBEDTLS}>:MbedTLS::mbedtls>
$<$<BOOL:${COAP_WITH_LIBWOLFSSL}>:wolfssl::wolfssl>
$<$<BOOL:${WIN32}>:ws2_32>
$<$<BOOL:${WIN32}>:iphlpapi>)

target_compile_options(
${COAP_LIBRARY_NAME}
Expand Down Expand Up @@ -912,7 +787,7 @@ if(ENABLE_TESTS)
# tests require libcunit (e.g. debian libcunit1-dev)
find_package(CUnit REQUIRED)
target_link_libraries(testdriver PUBLIC ${PROJECT_NAME}::${COAP_LIBRARY_NAME}
cunit)
CUnit::cunit)
include(CTest)
add_test(NAME Tests COMMAND testdriver)
endif()
Expand Down
2 changes: 1 addition & 1 deletion Makefile.am
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ EXTRA_DIST = \
cmake/FindCUnit.cmake \
cmake/FindMbedTLS.cmake \
cmake/FindTinyDTLS.cmake \
cmake/FindwolfSSL.cmake \
cmake/Findwolfssl.cmake \
coap_config.h.contiki \
coap_config.h.riot \
coap_config.h.windows \
Expand Down
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