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https://github.com/optim-enterprises-bv/nDPId-2.git
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274 lines
9.0 KiB
CMake
274 lines
9.0 KiB
CMake
#
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# - Find libpcap
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# Find the native PCAP includes and library
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#
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# PCAP_INCLUDE_DIRS - where to find pcap.h, etc.
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# PCAP_LIBRARIES - List of libraries when using pcap.
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# PCAP_FOUND - True if pcap found.
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#
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# First, try pkg-config on platforms other than Windows.
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#
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if(NOT WIN32)
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find_package(PkgConfig)
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pkg_search_module(PC_PCAP libpcap)
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endif()
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if(NOT PC_PCAP_FOUND AND NOT WIN32)
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#
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# That didn't work. Try to retrieve hints from pcap-config.
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# Do not use it on Windows as pcap-config is a shell script.
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#
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find_program(PCAP_CONFIG pcap-config)
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if(PCAP_CONFIG)
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#
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# We have pcap-config; use it.
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#
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# First, get the include directory.
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#
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execute_process(COMMAND "${PCAP_CONFIG}" "--cflags"
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RESULT_VARIABLE PCAP_CONFIG_RESULT
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OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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if(NOT PCAP_CONFIG_RESULT EQUAL 0)
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message(FATAL_ERROR "pcap-config --cflags failed")
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endif()
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#
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# Assumes there's exactly one -I flag in the output
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# of pcap-config --cflags. That *should* be the case.
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# Note that the hint might be bogus, on macOS it could be
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# -I/usr/local/include even though the header isn't
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# there (it may be under /usr/include or it may be
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# buried in the Xcode app bundle).
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#
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string(REGEX REPLACE "^-I" "" PCAP_CONFIG_INCLUDE_DIRS "${PCAP_CONFIG_OUTPUT}")
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# Now, get the library search path.
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execute_process(COMMAND "${PCAP_CONFIG}" "--libs"
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RESULT_VARIABLE PCAP_CONFIG_RESULT
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OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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if(NOT PCAP_CONFIG_RESULT EQUAL 0)
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message(FATAL_ERROR "pcap-config --libs failed")
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endif()
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separate_arguments(LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT})
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set(PCAP_CONFIG_LIBRARY_DIRS "")
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foreach(_arg IN LISTS LIBS_LIST)
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# At most one -L path is expected for -lpcap.
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if(_arg MATCHES "^-L")
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string(REGEX REPLACE "^-L" "" _dir ${_arg})
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list(APPEND PCAP_CONFIG_LIBRARY_DIRS ${_dir})
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endif()
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endforeach()
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if(UNIX AND CMAKE_FIND_LIBRARY_SUFFIXES STREQUAL ".a")
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# Now, get the library directories and libraries for static linking.
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# (XXX - what about AIX?)
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execute_process(COMMAND "${PCAP_CONFIG}" "--libs" "--static"
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RESULT_VARIABLE PCAP_CONFIG_RESULT
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OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
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)
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if(NOT PCAP_CONFIG_RESULT EQUAL 0)
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message(FATAL_ERROR "pcap-config --libs --static failed")
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endif()
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separate_arguments(LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT})
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set(PCAP_CONFIG_STATIC_LIBRARY_DIRS "")
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set(PCAP_CONFIG_STATIC_LIBRARIES "")
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foreach(_arg IN LISTS LIBS_LIST)
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if(_arg MATCHES "^-L")
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# Add this directory to the library directory hints.
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string(REGEX REPLACE "^-L" "" _dir ${_arg})
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list(APPEND PCAP_CONFIG_STATIC_LIBRARY_DIRS ${_dir})
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elseif(_arg MATCHES "^-l")
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# Add this library to the requirements for static linking.
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string(REGEX REPLACE "^-l" "" _lib ${_arg})
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list(APPEND PCAP_CONFIG_STATIC_LIBRARIES ${_lib})
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endif()
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endforeach()
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endif()
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endif()
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endif()
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#
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# Locate the actual include directory. For pkg-config the
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# PC_PCAP_INCLUDE_DIRS variable could be empty if the default
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# header search path is sufficient to locate the header file.
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# For macOS, the directory returned by pcap-config is wrong, so
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# this will make sure to find a valid path.
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#
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find_path(PCAP_INCLUDE_DIR
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NAMES
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pcap/pcap.h
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pcap.h
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HINTS
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${PC_PCAP_INCLUDE_DIRS}
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${PCAP_CONFIG_INCLUDE_DIRS}
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"${PCAP_HINTS}/Include"
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)
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# On Windows we load wpcap.dll explicitly and probe its functions in
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# caputils\capture-wpcap.c. We don't want to link with pcap.lib since
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# that would bring in the non-capturing (null) pcap.dll from the vcpkg
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# library.
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if(WIN32)
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set(_pkg_required_vars PCAP_INCLUDE_DIR)
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else()
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find_library(PCAP_LIBRARY
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NAMES
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pcap
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HINTS
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${PC_PCAP_LIBRARY_DIRS}
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${PCAP_CONFIG_LIBRARY_DIRS}
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)
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set(_pkg_required_vars PCAP_LIBRARY PCAP_INCLUDE_DIR)
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endif()
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if(UNIX AND CMAKE_FIND_LIBRARY_SUFFIXES STREQUAL ".a")
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# Try to find the static library (XXX - what about AIX?)
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if(PC_PCAP_FOUND)
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set(_pcap_static_libraries ${PC_PCAP_STATIC_LIBRARIES})
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elseif(PCAP_CONFIG)
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set(_pcap_static_libraries ${PCAP_CONFIG_STATIC_LIBRARIES})
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else()
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#
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# No pkg-config nor pcap-config found, hope that this single library is
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# sufficient for static linking.
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#
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set(_pcap_static_libraries pcap)
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endif()
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set(PCAP_STATIC_LIBRARIES "")
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foreach(_lib IN LISTS _pcap_static_libraries)
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#
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# Try to find that library, so we get its full path, as
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# we do with dynamic libraries.
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#
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string(MAKE_C_IDENTIFIER "PCAP_STATIC_${_lib}_LIBRARY" _libvar)
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find_library(${_libvar} ${_lib}
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HINTS
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${PC_PCAP_STATIC_LIBRARY_DIRS}
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${PCAP_CONFIG_STATIC_LIBRARY_DIRS}
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)
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set(_libpath ${${_libvar}})
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if(_libpath)
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list(APPEND PCAP_STATIC_LIBRARIES ${_libpath})
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endif()
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endforeach()
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endif()
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include(FindPackageHandleStandardArgs)
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find_package_handle_standard_args(PCAP DEFAULT_MSG ${_pkg_required_vars})
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mark_as_advanced(${_pkg_required_vars})
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if(PCAP_FOUND)
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set(PCAP_INCLUDE_DIRS ${PCAP_INCLUDE_DIR})
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if(UNIX AND CMAKE_FIND_LIBRARY_SUFFIXES STREQUAL ".a")
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# Link with static libpcap and its transitive dependencies.
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set(PCAP_LIBRARIES ${PCAP_STATIC_LIBRARIES})
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else()
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set(PCAP_LIBRARIES ${PCAP_LIBRARY})
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endif()
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#Functions
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include( CMakePushCheckState )
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include( CheckFunctionExists )
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include( CheckVariableExists )
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cmake_push_check_state()
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set( CMAKE_REQUIRED_INCLUDES ${PCAP_INCLUDE_DIRS} )
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set( CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARIES} )
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include(CheckSymbolExists)
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if(WIN32)
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#
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# Prepopulate some values. WinPcap 3.1 and later, and Npcap, have these
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# in their SDK, and compilation checks on Windows can be slow. We check
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# whether they're present at run time, when we load wpcap.dll, and work
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# around their absence or report an error.
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#
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set(HAVE_PCAP_FREECODE TRUE)
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set(HAVE_PCAP_CREATE TRUE)
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set(HAVE_PCAP_FREE_DATALINKS TRUE)
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set(HAVE_PCAP_OPEN TRUE)
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set(HAVE_PCAP_SETSAMPLING TRUE)
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set(HAVE_PCAP_SET_TSTAMP_PRECISION TRUE)
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set(HAVE_PCAP_SET_TSTAMP_TYPE TRUE)
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else(WIN32)
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#
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# Make sure we have at least libpcap 0.8, because we we require at
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# least libpcap 0.8's APIs.
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#
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# We check whether pcap_lib_version is defined in the pcap header,
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# using it as a proxy for all the 0.8 API's. if not, we fail.
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#
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check_symbol_exists( pcap_lib_version ${PCAP_INCLUDE_DIR}/pcap.h HAVE_PCAP_LIB_VERSION )
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if( NOT HAVE_PCAP_LIB_VERSION )
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message(FATAL_ERROR "You need libpcap 0.8 or later")
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endif( NOT HAVE_PCAP_LIB_VERSION )
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check_function_exists( "pcap_freecode" HAVE_PCAP_FREECODE )
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check_function_exists( "pcap_create" HAVE_PCAP_CREATE )
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check_function_exists( "pcap_free_datalinks" HAVE_PCAP_FREE_DATALINKS )
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check_function_exists( "pcap_open" HAVE_PCAP_OPEN )
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if( HAVE_PCAP_OPEN )
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#
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# XXX - this *should* be checked for independently of checking
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# for pcap_open(), as you might have pcap_setsampling() without
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# remote capture support.
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#
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# However, 1) the sampling options are treated as remote options
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# in the GUI and and 2) having pcap_setsampling() doesn't mean
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# you have sampling support. libpcap needs a way to indicate
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# whether a given device supports sampling, and the GUI should
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# be changed to decouple them.
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#
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# (Actually, libpcap needs a general mechanism to offer options
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# for particular devices, and Wireshark needs to use that
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# mechanism. The former is a work in progress.)
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#
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# (Note: another work in progress is support for remote
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# capturing using pcap_create()/pcap_activate(), which we
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# also need to support once it's available.)
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#
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check_function_exists( "pcap_setsampling" HAVE_PCAP_SETSAMPLING )
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endif( HAVE_PCAP_OPEN )
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endif(WIN32)
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if( HAVE_PCAP_CREATE )
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#
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# If we have pcap_create(), we have pcap_set_buffer_size(), and
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# can set the capture buffer size.
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#
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# Otherwise, if this is Windows, we have pcap_setbuff(), and can
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# set the capture buffer size.
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#
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set( CAN_SET_CAPTURE_BUFFER_SIZE TRUE )
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endif()
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check_function_exists( "pcap_set_tstamp_precision" HAVE_PCAP_SET_TSTAMP_PRECISION )
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check_function_exists( "pcap_set_tstamp_type" HAVE_PCAP_SET_TSTAMP_TYPE )
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# Remote pcap checks
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if( HAVE_PCAP_OPEN )
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set( HAVE_PCAP_REMOTE 1 )
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endif()
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cmake_pop_check_state()
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endif()
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if(PCAP_FOUND AND NOT TARGET pcap::pcap)
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if(WIN32)
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add_library(pcap::pcap INTERFACE IMPORTED)
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set_target_properties(pcap::pcap PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES "${PCAP_INCLUDE_DIRS}"
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)
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else()
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add_library(pcap::pcap UNKNOWN IMPORTED)
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set_target_properties(pcap::pcap PROPERTIES
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IMPORTED_LOCATION "${PCAP_LIBRARIES}"
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INTERFACE_INCLUDE_DIRECTORIES "${PCAP_INCLUDE_DIRS}"
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)
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endif()
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endif()
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