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#
# Find the native netlink includes and library
#
# If they exist, differentiate between versions 1, 2 and 3.
# Version 1 does not have netlink/version.h
# Version 2 started separating libraries (libnl{,-genl,-route}).
# Version 3 (>= 3.2) started appending the major version number as suffix to
# library names (libnl-3)
#
# NL_INCLUDE_DIRS - where to find libnl.h, etc.
# NL_LIBRARIES - List of libraries when using libnl.
# NL_FOUND - True if libnl found.
if(NL_LIBRARIES AND NL_INCLUDE_DIRS)
# in cache already
SET(NL_FOUND TRUE)
else()
SET( SEARCHPATHS
/opt/local
/sw
/usr
/usr/local
)
find_package(PkgConfig)
pkg_check_modules(NL3 libnl-3.0 libnl-genl-3.0 libnl-route-3.0)
if(NOT NL3_FOUND)
pkg_search_module(NL2 libnl-2.0)
endif()
# Try to find NL 2.0, 3.0 or 3.1 (/usr/include/netlink/version.h) or
# NL >= 3.2 (/usr/include/libnl3/netlink/version.h)
find_path(NL3_INCLUDE_DIR
PATH_SUFFIXES
include/libnl3
include
NAMES
netlink/version.h
HINTS
"${NL3_libnl-3.0_INCLUDEDIR}"
"${NL2_INCLUDEDIR}"
PATHS
$(SEARCHPATHS)
)
# NL version >= 2
if(NL3_INCLUDE_DIR)
find_library(NL3_LIBRARY
NAMES
nl-3 nl
PATH_SUFFIXES
lib64 lib
HINTS
"${NL3_libnl-3.0_LIBDIR}"
"${NL2_LIBDIR}"
PATHS
$(SEARCHPATHS)
)
find_library(NLGENL_LIBRARY
NAMES
nl-genl-3 nl-genl
PATH_SUFFIXES
lib64 lib
HINTS
"${NL3_libnl-genl-3.0_LIBDIR}"
"${NL2_LIBDIR}"
PATHS
$(SEARCHPATHS)
)
find_library(NLROUTE_LIBRARY
NAMES
nl-route-3 nl-route
PATH_SUFFIXES
lib64 lib
HINTS
"${NL3_libnl-route-3.0_LIBDIR}"
"${NL2_LIBDIR}"
PATHS
$(SEARCHPATHS)
)
#
# If we don't have all of those libraries, we can't use libnl.
#
if(NL3_LIBRARY AND NLGENL_LIBRARY AND NLROUTE_LIBRARY)
set(NL_LIBRARY ${NL3_LIBRARY})
if(NL3_INCLUDE_DIR)
# NL2 and NL3 are similar and just affect how the version is reported in
# the --version output. In cast of doubt, assume NL3 since a library
# without version number could be any of 2.0, 3.0 or 3.1.
if(NOT NL3_FOUND AND NL2_FOUND)
set(HAVE_LIBNL2 1)
else()
set(HAVE_LIBNL3 1)
endif()
endif()
endif()
set(NL_INCLUDE_DIR ${NL3_INCLUDE_DIR})
endif()
# libnl-2 and libnl-3 not found, try NL version 1
if(NOT (NL_LIBRARY AND NL_INCLUDE_DIR))
pkg_search_module(NL1 libnl-1)
find_path(NL1_INCLUDE_DIR
NAMES
netlink/netlink.h
HINTS
"${NL1_INCLUDEDIR}"
PATHS
$(SEARCHPATHS)
)
find_library(NL1_LIBRARY
NAMES
nl
PATH_SUFFIXES
lib64 lib
HINTS
"${NL1_LIBDIR}"
PATHS
$(SEARCHPATHS)
)
set(NL_LIBRARY ${NL1_LIBRARY})
set(NL_INCLUDE_DIR ${NL1_INCLUDE_DIR})
if(NL1_LIBRARY AND NL1_INCLUDE_DIR)
set(HAVE_LIBNL1 1)
endif()
endif()
endif()
# MESSAGE(STATUS "LIB Found: ${NL_LIBRARY}, Suffix: ${NLSUFFIX}\n 1:${HAVE_LIBNL1}, 2:${HAVE_LIBNL2}, 3:${HAVE_LIBNL3}.")
# handle the QUIETLY and REQUIRED arguments and set NL_FOUND to TRUE if
# all listed variables are TRUE
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(NL DEFAULT_MSG NL_LIBRARY NL_INCLUDE_DIR)
IF(NL_FOUND)
set(NL_LIBRARIES ${NLGENL_LIBRARY} ${NLROUTE_LIBRARY} ${NL_LIBRARY})
set(NL_INCLUDE_DIRS ${NL_INCLUDE_DIR})
set(HAVE_LIBNL 1)
else()
set(NL_LIBRARIES )
set(NL_INCLUDE_DIRS)
endif()
MARK_AS_ADVANCED( NL_LIBRARIES NL_INCLUDE_DIRS )
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