1 files changed, 102 insertions, 0 deletions
diff --git a/packaging/cmake/Modules/NetdataLibBPF.cmake b/packaging/cmake/Modules/NetdataLibBPF.cmake
new file mode 100644
index 00000000..17a26a10
--- /dev/null
+++ b/packaging/cmake/Modules/NetdataLibBPF.cmake
@@ -0,0 +1,102 @@
+# Handling for libbpf (used by the eBPF plugin)
+#
+# Copyright (c) 2024 Netdata Inc.
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+include(ExternalProject)
+include(NetdataUtil)
+
+set(libbpf_SOURCE_DIR "${CMAKE_BINARY_DIR}/libbpf")
+
+# Check if the kernel is old enough that we need to use a legacy copy of eBPF.
+function(_need_legacy_libbpf _var)
+    if(FORCE_LEGACY_LIBBPF)
+        set(${_var} TRUE PARENT_SCOPE)
+        return()
+    endif()
+
+    netdata_detect_host_kernel_version()
+
+    if(HOST_KERNEL_VERSION VERSION_LESS "4.14.0")
+        set(${_var} TRUE PARENT_SCOPE)
+    else()
+        set(${_var} FALSE PARENT_SCOPE)
+    endif()
+endfunction()
+
+# Prepare a vendored copy of libbpf
+function(netdata_bundle_libbpf)
+    _need_legacy_libbpf(USE_LEGACY_LIBBPF)
+
+    if(USE_LEGACY_LIBBPF)
+        set(_libbpf_tag 673424c56127bb556e64095f41fd60c26f9083ec) # v0.0.9_netdata-1
+    else()
+        set(_libbpf_tag 3d78a726c618560ad7fb03ceaf0fd03e8b2656b4) # v1.4.3p_netdata
+    endif()
+
+    if(DEFINED BUILD_SHARED_LIBS)
+        if(NOT BUILD_SHARED_LIBS)
+            set(need_static TRUE)
+        endif()
+    endif()
+
+    if(NOT need_static)
+        netdata_identify_libc(_libc)
+
+        string(REGEX MATCH "glibc|musl" _libc_supported "${_libc}")
+
+        if(NOT _libc_supported)
+            message(FATAL_ERROR "This system’s libc (detected: ${_libc}) is not not supported by the eBPF plugin.")
+        endif()
+    endif()
+
+    find_program(MAKE_COMMAND make)
+
+    if(MAKE_COMMAND STREQUAL MAKE_COMMAND-NOTFOUND)
+        message(FATAL_ERROR "GNU Make is required when building the eBPF plugin, but could not be found.")
+    endif()
+
+    pkg_check_modules(ELF REQUIRED libelf)
+    pkg_check_modules(ZLIB REQUIRED zlib)
+
+    set(_libbpf_lib_dir lib)
+
+    if(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
+        set(_libbpf_lib_dir lib64)
+    endif()
+
+    set(_libbpf_library "${libbpf_SOURCE_DIR}/usr/${_libbpf_lib_dir}/libbpf.a")
+
+    ExternalProject_Add(
+        libbpf
+        GIT_REPOSITORY https://github.com/netdata/libbpf.git
+        GIT_TAG ${_libbpf_tag}
+        SOURCE_DIR "${libbpf_SOURCE_DIR}"
+        CONFIGURE_COMMAND ""
+        BUILD_COMMAND ${MAKE_COMMAND} -C src CC=${CMAKE_C_COMPILER} BUILD_STATIC_ONLY=1 OBJDIR=build/ DESTDIR=../ install
+        BUILD_IN_SOURCE 1
+        BUILD_BYPRODUCTS "${_libbpf_library}"
+        INSTALL_COMMAND ""
+        EXCLUDE_FROM_ALL 1
+    )
+
+    add_library(libbpf_library STATIC IMPORTED GLOBAL)
+    set_property(
+        TARGET libbpf_library
+        PROPERTY IMPORTED_LOCATION "${_libbpf_library}"
+    )
+    set_property(
+        TARGET libbpf_library
+        PROPERTY INTERFACE_LINK_LIBRARIES "${ELF_LIBRARIES};${ZLIB_LIBRARIES}"
+    )
+    set(NETDATA_LIBBPF_INCLUDE_DIRECTORIES "${libbpf_SOURCE_DIR}/usr/include;${libbpf_SOURCE_DIR}/include;${ELF_INCLUDE_DIRECTORIES};${ZLIB_INCLUDE_DIRECTORIES}" PARENT_SCOPE)
+    set(NETDATA_LIBBPF_COMPILE_OPTIONS "${ELF_CFLAGS_OTHER};${ZLIB_CFLAGS_OTHER}" PARENT_SCOPE)
+endfunction()
+
+# Add libbpf as a link dependency for the given target.
+function(netdata_add_libbpf_to_target _target)
+    target_link_libraries(${_target} PUBLIC libbpf_library)
+    target_include_directories(${_target} BEFORE PUBLIC "${NETDATA_LIBBPF_INCLUDE_DIRECTORIES}")
+    target_compile_options(${_target} PUBLIC "${NETDATA_LIBBPF_COMPILE_OPTIONS}")
+    add_dependencies(${_target} libbpf)
+endfunction()