openssl.cmake

# SPDX-License-Identifier: Apache-2.0
#
# Copyright (C) 2023 The Falco Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
# in compliance with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the License
# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
# or implied. See the License for the specific language governing permissions and limitations under
# the License.
#

option(USE_BUNDLED_OPENSSL "Enable building of the bundled OpenSSL" ${USE_BUNDLED_DEPS})

if(OPENSSL_INCLUDE_DIR)
	# we already have openssl
elseif(NOT USE_BUNDLED_OPENSSL)
	find_package(OpenSSL REQUIRED)
	message(STATUS "Found OpenSSL: include: ${OPENSSL_INCLUDE_DIR}, lib: ${OPENSSL_LIBRARIES}")
else()
	if(BUILD_SHARED_LIBS)
		set(OPENSSL_LIB_SUFFIX ${CMAKE_SHARED_LIBRARY_SUFFIX})
		set(OPENSSL_SHARED_OPTION shared)
	else()
		set(OPENSSL_LIB_SUFFIX ${CMAKE_STATIC_LIBRARY_SUFFIX})
		set(OPENSSL_SHARED_OPTION no-shared)
	endif()
	set(OPENSSL_BUNDLE_DIR "${PROJECT_BINARY_DIR}/openssl-prefix/src/openssl")
	set(OPENSSL_INSTALL_DIR "${OPENSSL_BUNDLE_DIR}/target")
	set(OPENSSL_INCLUDE_DIR "${PROJECT_BINARY_DIR}/openssl-prefix/src/openssl/include/")
	set(OPENSSL_LIBRARY_SSL "${OPENSSL_INSTALL_DIR}/lib/libssl${OPENSSL_LIB_SUFFIX}")
	set(OPENSSL_LIBRARY_CRYPTO "${OPENSSL_INSTALL_DIR}/lib/libcrypto${OPENSSL_LIB_SUFFIX}")
	set(OPENSSL_LIBRARIES ${OPENSSL_LIBRARY_SSL} ${OPENSSL_LIBRARY_CRYPTO})

	if(NOT TARGET openssl)
		if(NOT ENABLE_PIC)
			set(OPENSSL_PIC_OPTION)
		else()
			set(OPENSSL_PIC_OPTION "-fPIC")
		endif()

		message(STATUS "Using bundled openssl in '${OPENSSL_BUNDLE_DIR}'")

		ExternalProject_Add(
			openssl
			PREFIX "${PROJECT_BINARY_DIR}/openssl-prefix"
			URL "https://github.com/openssl/openssl/releases/download/openssl-3.1.4/openssl-3.1.4.tar.gz"
			URL_HASH "SHA256=840af5366ab9b522bde525826be3ef0fb0af81c6a9ebd84caa600fea1731eee3"
			CONFIGURE_COMMAND ./config ${OPENSSL_SHARED_OPTION} ${OPENSSL_PIC_OPTION}
							  --prefix=${OPENSSL_INSTALL_DIR} --libdir=lib
			BUILD_COMMAND make
			BUILD_IN_SOURCE 1
			BUILD_BYPRODUCTS ${OPENSSL_LIBRARY_SSL} ${OPENSSL_LIBRARY_CRYPTO}
			INSTALL_COMMAND make install_sw
		)
		install(
			FILES "${OPENSSL_LIBRARY_SSL}"
			DESTINATION "${CMAKE_INSTALL_LIBDIR}/${LIBS_PACKAGE_NAME}"
			COMPONENT "libs-deps"
		)
		install(
			FILES "${OPENSSL_LIBRARY_CRYPTO}"
			DESTINATION "${CMAKE_INSTALL_LIBDIR}/${LIBS_PACKAGE_NAME}"
			COMPONENT "libs-deps"
		)
		install(
			DIRECTORY "${OPENSSL_INCLUDE_DIR}"
			DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${LIBS_PACKAGE_NAME}"
			COMPONENT "libs-deps"
		)
	endif()
endif()

if(NOT TARGET openssl)
	add_custom_target(openssl)
endif()

include_directories("${OPENSSL_INCLUDE_DIR}")