build: Refactor CMake back to in-tree CMakeListsbe

This moves the build definitions back to src/ subdirectories
(CMakeLists.txt per component). Configuration and dependencies are
kept out of tree. Configuration options are bundled into cmake/config/
modules. Dependencies are grouped by component (system/, crypt/, eth/,
coverage/, etc.). It now consistently uses target-based commands
(target_include_directories, target_link_libraries) instead of global
include_directories(). Proper PRIVATE/PUBLIC visibility for executable
link libraries. CONFIG_OUROBOROS_DEBUG now properly set based on being
a valid debug config (not just checking the string name).

It also adds OuroborosTargets export for find_package() support and
CMake package config files (OuroborosConfig.cmake) for easier
integration with CMake projects.

The build logic now follows more idiomatic CMake practices with
configuration separated from target definitions.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

4 files changed, 167 insertions, 30 deletions

diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
new file mode 100644
index 00000000..c4306b00
--- /dev/null
+++ b/src/lib/CMakeLists.txt
@@ -0,0 +1,160 @@
+# Ouroboros libraries build configuration
+# Configuration options are in cmake/config/lib.cmake
+
+protobuf_generate_c(MODEL_PROTO_SRCS MODEL_PROTO_HDRS
+  "${CMAKE_CURRENT_SOURCE_DIR}/pb/model.proto")
+protobuf_generate_c(IPCP_CONFIG_PROTO_SRCS IPCP_CONFIG_PROTO_HDRS
+  "${CMAKE_CURRENT_SOURCE_DIR}/pb/ipcp_config.proto")
+protobuf_generate_c(ENROLL_PROTO_SRCS ENROLL_PROTO_HDRS
+  "${CMAKE_CURRENT_SOURCE_DIR}/pb/enroll.proto")
+protobuf_generate_c(CEP_PROTO_SRCS CEP_PROTO_HDRS
+  "${CMAKE_CURRENT_SOURCE_DIR}/pb/cep.proto")
+protobuf_generate_c(IRM_PROTO_SRCS IRM_PROTO_HDRS
+  "${CMAKE_CURRENT_SOURCE_DIR}/pb/irm.proto")
+protobuf_generate_c(IPCP_PROTO_SRCS IPCP_PROTO_HDRS
+  "${CMAKE_CURRENT_SOURCE_DIR}/pb/ipcp.proto")
+
+set(SOURCE_FILES_COMMON
+  bitmap.c
+  btree.c
+  crc32.c
+  crypt.c
+  hash.c
+  list.c
+  lockfile.c
+  logs.c
+  md5.c
+  notifier.c
+  protobuf.c
+  qoscube.c
+  random.c
+  rib.c
+  serdes-irm.c
+  serdes-oep.c
+  sha3.c
+  ssm/flow_set.c
+  ssm/rbuff.c
+  ssm/pool.c
+  sockets.c
+  tpm.c
+  utils.c
+)
+
+if(HAVE_OPENSSL)
+  list(APPEND SOURCE_FILES_COMMON crypt/openssl.c)
+endif()
+
+add_library(ouroboros-common SHARED
+  ${SOURCE_FILES_COMMON}
+  ${IRM_PROTO_SRCS}
+  ${IPCP_PROTO_SRCS}
+  ${IPCP_CONFIG_PROTO_SRCS}
+  ${MODEL_PROTO_SRCS}
+  ${ENROLL_PROTO_SRCS})
+
+set_target_properties(ouroboros-common PROPERTIES
+  VERSION ${PACKAGE_VERSION}
+  SOVERSION ${PACKAGE_VERSION_MAJOR}.${PACKAGE_VERSION_MINOR})
+
+ouroboros_target_debug_definitions(ouroboros-common)
+
+target_include_directories(ouroboros-common
+  PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
+    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/include>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
+    $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+  PRIVATE
+    ${SYS_RND_HDR}
+    ${APPLE_INCLUDE_DIRS})
+
+target_link_libraries(ouroboros-common
+  PRIVATE
+    ${LIBRT_LIBRARIES}
+    Threads::Threads
+  PUBLIC
+    ProtobufC::ProtobufC)
+
+if(HAVE_OPENSSL)
+  target_link_libraries(ouroboros-common PUBLIC OpenSSL::Crypto)
+endif()
+
+if(HAVE_LIBGCRYPT)
+  target_link_libraries(ouroboros-common PUBLIC Gcrypt::Gcrypt)
+endif()
+
+if(HAVE_FUSE)
+  target_link_libraries(ouroboros-common PRIVATE Fuse::Fuse)
+endif()
+
+install(TARGETS ouroboros-common
+  EXPORT OuroborosTargets
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+set(SOURCE_FILES_DEV
+  cep.c
+  dev.c
+)
+
+add_library(ouroboros-dev SHARED
+  ${SOURCE_FILES_DEV}
+  ${CEP_PROTO_SRCS})
+
+set_target_properties(ouroboros-dev PROPERTIES
+  VERSION ${PACKAGE_VERSION}
+  SOVERSION ${PACKAGE_VERSION_MAJOR}.${PACKAGE_VERSION_MINOR})
+
+ouroboros_target_debug_definitions(ouroboros-dev)
+
+target_include_directories(ouroboros-dev
+  PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+  PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_BINARY_DIR}
+    ${CMAKE_BINARY_DIR}
+    ${SYS_RND_HDR})
+
+target_link_libraries(ouroboros-dev PUBLIC ouroboros-common)
+
+install(TARGETS ouroboros-dev
+  EXPORT OuroborosTargets
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+add_library(ouroboros-irm SHARED irm.c)
+
+set_target_properties(ouroboros-irm PROPERTIES
+  VERSION ${PACKAGE_VERSION}
+  SOVERSION ${PACKAGE_VERSION_MAJOR}.${PACKAGE_VERSION_MINOR})
+
+ouroboros_target_debug_definitions(ouroboros-irm)
+
+target_include_directories(ouroboros-irm
+  PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+  PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${CMAKE_CURRENT_BINARY_DIR}
+    ${CMAKE_BINARY_DIR}
+    ${SYS_RND_HDR})
+
+target_link_libraries(ouroboros-irm PUBLIC ouroboros-common)
+
+install(TARGETS ouroboros-irm
+  EXPORT OuroborosTargets
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR})
+
+configure_file("${CMAKE_CURRENT_SOURCE_DIR}/config.h.in"
+  "${CMAKE_CURRENT_BINARY_DIR}/config.h" @ONLY)
+
+configure_file("${CMAKE_CURRENT_SOURCE_DIR}/ssm/ssm.h.in"
+  "${CMAKE_CURRENT_BINARY_DIR}/ssm.h" @ONLY)
+
+if(BUILD_TESTS)
+  add_subdirectory(tests)
+  add_subdirectory(ssm/tests)
+endif()
diff --git a/src/lib/crypt.c b/src/lib/crypt.c
index 38dd9f29..8c29cbb3 100644
--- a/src/lib/crypt.c
+++ b/src/lib/crypt.c
@@ -20,6 +20,10 @@
  * Foundation, Inc., http://www.fsf.org/about/contact/.
  */
 
+#if defined(__linux__) || defined(__CYGWIN__)
+#define _DEFAULT_SOURCE
+#endif
+
 #include <config.h>
 
 #include <ouroboros/errno.h>
diff --git a/src/lib/ssm/tests/CMakeLists.txt b/src/lib/ssm/tests/CMakeLists.txt
index 827f8bf8..5cac70d1 100644
--- a/src/lib/ssm/tests/CMakeLists.txt
+++ b/src/lib/ssm/tests/CMakeLists.txt
@@ -18,16 +18,5 @@ target_link_libraries(${PARENT_DIR}_test ouroboros-common)
 
 add_dependencies(build_tests ${PARENT_DIR}_test)
 
-set(tests_to_run ${${PARENT_DIR}_tests})
-if(CMAKE_VERSION VERSION_LESS "3.29.0")
-  remove(tests_to_run test_suite.c)
-else ()
-  list(POP_FRONT tests_to_run)
-endif()
-
-foreach (test ${tests_to_run})
-  get_filename_component(test_name ${test} NAME_WE)
-  add_test(${TEST_PREFIX}/${test_name} ${C_TEST_PATH}/${PARENT_DIR}_test ${test_name})
-  set_property(TEST ${TEST_PREFIX}/${test_name}
-               PROPERTY ENVIRONMENT "OUROBOROS_TEST_POOL_SUFFIX=.test")
-endforeach (test)
+ouroboros_register_tests(TARGET ${PARENT_DIR}_test TESTS ${${PARENT_DIR}_tests}
+  ENVIRONMENT "OUROBOROS_TEST_POOL_SUFFIX=.test")
diff --git a/src/lib/tests/CMakeLists.txt b/src/lib/tests/CMakeLists.txt
index d2535bc2..23d01f9b 100644
--- a/src/lib/tests/CMakeLists.txt
+++ b/src/lib/tests/CMakeLists.txt
@@ -28,20 +28,4 @@ target_link_libraries(${PARENT_DIR}_test ouroboros-common)
 
 add_dependencies(build_tests ${PARENT_DIR}_test)
 
-set(tests_to_run ${${PARENT_DIR}_tests})
-if(CMAKE_VERSION VERSION_LESS "3.29.0")
-  remove(tests_to_run test_suite.c)
-else ()
-  list(POP_FRONT tests_to_run)
-endif()
-
-foreach (test ${tests_to_run})
-  get_filename_component(test_name ${test} NAME_WE)
-  add_test(${TEST_PREFIX}/${test_name} ${CMAKE_CURRENT_BINARY_DIR}/${PARENT_DIR}_test ${test_name})
-endforeach (test)
-
-set_property(TEST ${TEST_PREFIX}/auth_test PROPERTY SKIP_RETURN_CODE 1)
-set_property(TEST ${TEST_PREFIX}/auth_test_pqc PROPERTY SKIP_RETURN_CODE 1)
-set_property(TEST ${TEST_PREFIX}/crypt_test PROPERTY SKIP_RETURN_CODE 1)
-set_property(TEST ${TEST_PREFIX}/kex_test PROPERTY SKIP_RETURN_CODE 1)
-set_property(TEST ${TEST_PREFIX}/kex_test_pqc PROPERTY SKIP_RETURN_CODE 1)
+ouroboros_register_tests(TARGET ${PARENT_DIR}_test TESTS ${${PARENT_DIR}_tests})