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#
# Try to find libpcap.
#
find_program(PCAP_CONFIG pcap-config)
if(PCAP_CONFIG)
#
# We have pcap-config; use it.
# XXX - what if this is on Windows? If you're using, for example,
# MinGW, that might be the right thing to do, *if* pcap-config
# were made to work properly on Windows, but what about MSVC?
#
# First, get the include directory.
#
execute_process(COMMAND "${PCAP_CONFIG}" "--cflags"
RESULT_VARIABLE PCAP_CONFIG_RESULT
OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(NOT PCAP_CONFIG_RESULT EQUAL 0)
message(FATAL_ERROR "pcap-config --cflags failed")
endif()
#
# XXX - this assumes that there's only one -I flag in the output
# of pcap-config --cflags. That *should* be the case.
#
string(REGEX REPLACE "-I" "" _pcap_include_dir "${PCAP_CONFIG_OUTPUT}")
# Try to find the header
# We use what pcap-config provided as a hint, because the
# pcap-config that ships with macOS bogusly supplies
# -I/usr/local/include even though the header isn't
# there (it may be under /usr/include or it may be
# buried in the Xcode app bundle).
find_path(PCAP_INCLUDE_DIRS pcap.h HINTS ${_pcap_include_dir})
# Now, get the libraries.
execute_process(COMMAND "${PCAP_CONFIG}" "--libs"
RESULT_VARIABLE PCAP_CONFIG_RESULT
OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(NOT PCAP_CONFIG_RESULT EQUAL 0)
message(FATAL_ERROR "pcap-config --libs failed")
endif()
separate_arguments(LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT})
set(_pcap_library_dirs)
set(PCAP_LIBRARIES)
foreach(_arg IN LISTS LIBS_LIST)
if(_arg MATCHES "^-L")
# Add this directory to _pcap_library_dirs
string(REGEX REPLACE "-L" "" _dir ${_arg})
list(APPEND _pcap_library_dirs ${_dir})
elseif(_arg MATCHES "^-l")
string(REGEX REPLACE "-l" "" _lib ${_arg})
#
# Try to find that library, so we get its full path.
# CMake *really* doesn't like the notion of specifying "here are
# the directories in which to look for libraries" except in
# find_library() calls; it *really* prefers using full paths to
# library files, rather than library names.
#
# Furthermore, the pcap-config shipped with macOS reports
# -I/usr/local/include for --cflags and -L/usr/local/lib for
# --libs, rather than reporting the appropriate system (or
# Xcode application) directory.
#
find_library(_libfullpath ${_lib} HINTS ${__pcap_library_dirs})
list(APPEND PCAP_LIBRARIES ${_libfullpath})
endif()
endforeach()
# Now, get the library directories and libraries for static linking.
execute_process(COMMAND "${PCAP_CONFIG}" "--libs" "--static"
RESULT_VARIABLE PCAP_CONFIG_RESULT
OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
)
if(NOT PCAP_CONFIG_RESULT EQUAL 0)
message(FATAL_ERROR "pcap-config --libs --static failed")
endif()
separate_arguments(LIBS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT})
set(_pcap_static_library_dirs)
set(PCAP_STATIC_LIBRARIES)
foreach(_arg IN LISTS LIBS_LIST)
if(_arg MATCHES "^-L")
# Add this directory to _pcap_static_library_dirs
string(REGEX REPLACE "-L" "" _dir ${_arg})
list(APPEND _pcap_static_library_dirs ${_dir})
elseif(_arg MATCHES "^-l")
string(REGEX REPLACE "-l" "" _lib ${_arg})
#
# Try to find that library, so we get its full path, as
# we do with dynamic libraries.
#
find_library(_libfullpath ${_lib} HINTS ${__pcap_static_library_dirs})
list(APPEND PCAP_STATIC_LIBRARIES ${_libfullpath})
endif()
endforeach()
else(PCAP_CONFIG)
#
# We don't have pcap-config.
# Try to find the header by just looking for it in whatever
# directories find_path() uses by default.
#
find_path(PCAP_INCLUDE_DIRS pcap.h)
# Try to find the library
if(WIN32)
# The 64-bit Packet.lib is located under /x64
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
#
# For the WinPcap and Npcap SDKs, the Lib subdirectory of the top-level
# directory contains 32-bit libraries; the 64-bit libraries are in the
# Lib/x64 directory.
#
# The only way to *FORCE* CMake to look in the Lib/x64 directory
# without searching in the Lib directory first appears to be to set
# CMAKE_LIBRARY_ARCHITECTURE to "x64".
#
set(CMAKE_LIBRARY_ARCHITECTURE "x64")
endif()
endif()
find_library(PCAP_LIBRAIES pcap)
if(WIN32)
if(NOT PCAP_LIBRARIES)
#
# OK, look for it under the name wpcap.
#
find_library(PCAP_LIBRARIES wpcap)
endif(NOT PCAP_LIBRARIES)
endif(WIN32)
if(NOT WIN32)
# Try to find the static library (XXX - what about AIX?)
include(CMakePushCheckState)
cmake_push_check_state()
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
find_library(PCAP_STATIC_LIBRARIES pcap)
cmake_pop_check_state()
endif(NOT WIN32)
endif(PCAP_CONFIG)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(PCAP
DEFAULT_MSG
PCAP_INCLUDE_DIRS
PCAP_LIBRARIES
)
mark_as_advanced(
PCAP_INCLUDE_DIR
PCAP_LIBRARY
PCAP_STATIC_LIBRARY
)
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