#
# Try to find libpcap.
#
+# To tell this module where to look, a user may set the environment variable
+# PCAP_ROOT to point cmake to the *root* of a directory with include and
+# lib subdirectories for pcap.dll (e.g WpdPack or npcap-sdk).
+# Alternatively, PCAP_ROOT may also be set from cmake command line or GUI
+# (e.g cmake -DPCAP_ROOT=C:\path\to\pcap [...])
+#
-find_program(PCAP_CONFIG pcap-config)
-if(PCAP_CONFIG)
+if(WIN32)
#
- # 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?
+ # Building for Windows.
#
- # First, get the include directory.
+ # libpcap isn't set up to install .pc files or pcap-config on Windows,
+ # and it's not clear that either of them would work without a lot
+ # of additional effort. WinPcap doesn't supply them, and neither
+ # does Npcap.
#
- execute_process(COMMAND "${PCAP_CONFIG}" "--cflags"
- RESULT_VARIABLE PCAP_CONFIG_RESULT
- OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
- OUTPUT_STRIP_TRAILING_WHITESPACE
- )
- if(NOT PCAP_CONFIG_RESULT EQUAL 0)
- message(FATAL_ERROR "pcap-config --cflags failed")
- endif()
+ # So just search for them directly. Look for both pcap and wpcap.
+ # Don't bother looking for static libraries; unlike most UN*Xes
+ # (with the exception of AIX), where different extensions are used
+ # for shared and static, Windows uses .lib both for import libraries
+ # for DLLs and for static libraries.
#
- # XXX - this assumes that there's only one -I flag in the output
- # of pcap-config --cflags. That *should* be the case.
+ # We don't directly set PCAP_INCLUDE_DIRS or PCAP_LIBRARIES, as
+ # they're not supposed to be cache entries, and find_path() and
+ # find_library() set cache entries.
#
- string(REGEX REPLACE "-I" "" _pcap_include_dir "${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")
+ find_path(PCAP_INCLUDE_DIR pcap.h)
+
+ # 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()
- 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 ${_libfullpath})
- endif()
- endforeach()
+ find_library(PCAP_LIBRARY NAMES pcap wpcap)
- # Now, get the library directories and libraries for static linking.
- execute_process(COMMAND "${PCAP_CONFIG}" "--libs" "--static"
- RESULT_VARIABLE PCAP_CONFIG_RESULT
- OUTPUT_VARIABLE PCAP_CONFIG_OUTPUT
+ #
+ # Do the standard arg processing, including failing if it's a
+ # required package.
+ #
+ include(FindPackageHandleStandardArgs)
+ find_package_handle_standard_args(PCAP
+ DEFAULT_MSG
+ PCAP_INCLUDE_DIR
+ PCAP_LIBRARY
)
- if(NOT PCAP_CONFIG_RESULT EQUAL 0)
- message(FATAL_ERROR "pcap-config --libs --static failed")
+ mark_as_advanced(
+ PCAP_INCLUDE_DIR
+ PCAP_LIBRARY
+ )
+ if(PCAP_FOUND)
+ set(PCAP_LIBRARIES ${PCAP_LIBRARY})
+ set(PCAP_INCLUDE_DIRS ${PCAP_INCLUDE_DIR})
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)
+else(WIN32)
#
- # We don't have pcap-config.
- # Try to find the header by just looking for it in whatever
- # directories find_path() uses by default.
+ # Building for UN*X.
#
- find_path(PCAP_INCLUDE_DIRS pcap.h)
+ # See whether we were handed a QUIET argument, so we can pass it on
+ # to pkg_search_module. Do *NOT* pass on the REQUIRED argument,
+ # because, if pkg-config isn't found, or it is but it has no .pc
+ # files for libpcap, that is *not* necessarily an indication that
+ # libpcap isn't available - not all systems ship pkg-config, and
+ # libpcap didn't have .pc files until libpcap 1.9.0.
+ #
+ if(PCAP_FIND_QUIETLY)
+ set(_quiet "QUIET")
+ endif()
+
+ #
+ # First, try pkg-config.
+ #
+ find_package(PkgConfig)
+ pkg_search_module(CONFIG_PCAP ${_quiet} libpcap)
+
+ if(NOT CONFIG_PCAP_FOUND)
+ #
+ # That didn't work. Try pcap-config.
+ #
+ find_program(PCAP_CONFIG pcap-config)
+ if(PCAP_CONFIG)
+ #
+ # We have pcap-config; use it.
+ #
+ if(NOT "${_quiet}" STREQUAL "QUIET")
+ message(STATUS "Found pcap-config")
+ endif()
+
+ #
+ # if this is macOS or some other Darwin-based OS, check whether
+ # it's the system-supplied one.
+ #
+ if(APPLE AND "${PCAP_CONFIG}" STREQUAL /usr/bin/pcap-config)
+ #
+ # It is - remember that, so that if it provides -I/usr/local/include
+ # with --cflags, or -L/usr/local/lib with --libs, we ignore it;
+ # the macOS pcap-config does that even though the headers aren't
+ # under /usr/local/include and the library isn't in /usr/local/lib.
+ #
+ set(_broken_apple_pcap_config TRUE)
+ endif()
- # Try to find the library
- if(WIN32)
- # The 64-bit Packet.lib is located under /x64
- if(CMAKE_SIZEOF_VOID_P EQUAL 8)
#
- # For the WinPcap and Npcap SDKs, the Lib subdirectory of the top-level
- # directory contains 32-bit libraries; the 64-bit libraries are in the
- # Lib/x64 directory.
+ # Now get the include directories.
#
- # The only way to *FORCE* CMake to look in the Lib/x64 directory
- # without searching in the Lib directory first appears to be to set
- # CMAKE_LIBRARY_ARCHITECTURE to "x64".
+ execute_process(COMMAND "${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()
+ separate_arguments(CFLAGS_LIST UNIX_COMMAND ${PCAP_CONFIG_OUTPUT})
+ set(CONFIG_PCAP_INCLUDE_DIRS "")
+ foreach(_arg IN LISTS CFLAGS_LIST)
+ if(_arg MATCHES "^-I")
+ #
+ # Extract the directory by removing the -I.
+ #
+ string(REGEX REPLACE "-I" "" _dir ${_arg})
+ #
+ # Work around macOS (and probably other Darwin) brokenness,
+ # by not adding /usr/local/include if it's from the broken
+ # Apple pcap-config.
+ #
+ if(NOT _broken_apple_pcap_config OR
+ NOT "${_dir}" STREQUAL /usr/local/include)
+ # Add it to CONFIG_PCAP_INCLUDE_DIRS
+ list(APPEND CONFIG_PCAP_INCLUDE_DIRS ${_dir})
+ endif()
+ endif()
+ endforeach()
+
#
- set(CMAKE_LIBRARY_ARCHITECTURE "x64")
+ # Now, get the library directories and libraries for dynamic linking.
+ #
+ execute_process(COMMAND "${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(CONFIG_PCAP_LIBRARY_DIRS "")
+ set(CONFIG_PCAP_LIBRARIES "")
+ foreach(_arg IN LISTS LIBS_LIST)
+ if(_arg MATCHES "^-L")
+ #
+ # Extract the directory by removing the -L.
+ #
+ string(REGEX REPLACE "-L" "" _dir ${_arg})
+ #
+ # Work around macOS (and probably other Darwin) brokenness,
+ # by not adding /usr/local/lib if it's from the broken
+ # Apple pcap-config.
+ #
+ if(NOT _broken_apple_pcap_config OR
+ NOT "${_dir}" STREQUAL /usr/local/lib)
+ # Add this directory to CONFIG_PCAP_LIBRARY_DIRS
+ list(APPEND CONFIG_PCAP_LIBRARY_DIRS ${_dir})
+ endif()
+ elseif(_arg MATCHES "^-l")
+ string(REGEX REPLACE "-l" "" _lib ${_arg})
+ list(APPEND CONFIG_PCAP_LIBRARIES ${_lib})
+ endif()
+ endforeach()
+
+ #
+ # Now, get the library directories and libraries for static linking.
+ #
+ execute_process(COMMAND "${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(CONFIG_PCAP_STATIC_LIBRARY_DIRS "")
+ set(CONFIG_PCAP_STATIC_LIBRARIES "")
+ foreach(_arg IN LISTS LIBS_LIST)
+ if(_arg MATCHES "^-L")
+ #
+ # Extract the directory by removing the -L.
+ #
+ string(REGEX REPLACE "-L" "" _dir ${_arg})
+ #
+ # Work around macOS (and probably other Darwin) brokenness,
+ # by not adding /usr/local/lib if it's from the broken
+ # Apple pcap-config.
+ #
+ if(NOT _broken_apple_pcap_config OR
+ NOT "${_dir}" STREQUAL /usr/local/lib)
+ # Add this directory to CONFIG_PCAP_STATIC_LIBRARY_DIRS
+ list(APPEND CONFIG_PCAP_STATIC_LIBRARY_DIRS ${_dir})
+ endif()
+ 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.
+ #
+ list(APPEND CONFIG_PCAP_STATIC_LIBRARIES ${_lib})
+ endif()
+ endforeach()
+
+ #
+ # We've set CONFIG_PCAP_INCLUDE_DIRS, CONFIG_PCAP_LIBRARIES, and
+ # CONFIG_PCAP_STATIC_LIBRARIES above; set CONFIG_PCAP_FOUND.
+ #
+ set(CONFIG_PCAP_FOUND YES)
endif()
endif()
- find_library(PCAP_LIBRARIES pcap)
- if(WIN32)
- if(NOT PCAP_LIBRARIES)
+ #
+ # If CONFIG_PCAP_FOUND is set, we have information from pkg-config and
+ # pcap-config; we need to convert library names to library full paths.
+ #
+ # If it's not set, we have to look for the libpcap headers and library
+ # ourselves.
+ #
+ if(CONFIG_PCAP_FOUND)
+ #
+ # Use CONFIG_PCAP_INCLUDE_DIRS as the value for PCAP_INCLUDE_DIRS.
+ #
+ set(PCAP_INCLUDE_DIRS "${CONFIG_PCAP_INCLUDE_DIRS}")
+
+ #
+ # 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.
+ #
+ foreach(_lib IN LISTS CONFIG_PCAP_LIBRARIES)
+ find_library(_libfullpath ${_lib} HINTS ${CONFIG_PCAP_LIBRARY_DIRS})
+ list(APPEND PCAP_LIBRARIES ${_libfullpath})
#
- # OK, look for it under the name wpcap.
+ # Remove that from the cache; we're using it as a local variable,
+ # but find_library insists on making it a cache variable.
#
- find_library(PCAP_LIBRARIES wpcap)
- endif(NOT PCAP_LIBRARIES)
- endif(WIN32)
- if(NOT WIN32)
+ unset(_libfullpath CACHE)
+ endforeach()
+
+ #
+ # Now do the same for the static libraries.
+ #
+ set(SAVED_CMAKE_FIND_LIBRARY_SUFFIXES "${CMAKE_FIND_LIBRARY_SUFFIXES}")
+ set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
+ foreach(_lib IN LISTS CONFIG_PCAP_STATIC_LIBRARIES)
+ find_library(_libfullpath ${_lib} HINTS ${CONFIG_PCAP_LIBRARY_DIRS})
+ list(APPEND PCAP_STATIC_LIBRARIES ${_libfullpath})
+ #
+ # Remove that from the cache; we're using it as a local variable,
+ # but find_library insists on making it a cache variable.
+ #
+ unset(_libfullpath CACHE)
+ endforeach()
+ set(CMAKE_FIND_LIBRARY_SUFFIXES "${SAVED_CMAKE_FIND_LIBRARY_SUFFIXES}")
+
+ #
+ # We found libpcap using pkg-config or pcap-config.
+ #
+ set(PCAP_FOUND YES)
+ else(CONFIG_PCAP_FOUND)
+ #
+ # We didn't have pkg-config, or we did but it didn't have .pc files
+ # for libpcap, and we don't have pkg-config, so we have to look for
+ # the headers and libraries ourself.
+ #
+ # We don't directly set PCAP_INCLUDE_DIRS or PCAP_LIBRARIES, as
+ # they're not supposed to be cache entries, and find_path() and
+ # find_library() set cache entries.
+ #
+ # Try to find the header file.
+ #
+ find_path(PCAP_INCLUDE_DIR pcap.h)
+
+ #
+ # Try to find the library
+ #
+ find_library(PCAP_LIBRARY pcap)
+
# Try to find the static library (XXX - what about AIX?)
- include(CMakePushCheckState)
- cmake_push_check_state()
+ set(SAVED_CMAKE_FIND_LIBRARY_SUFFIXES "${CMAKE_FIND_LIBRARY_SUFFIXES}")
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
- find_library(PCAP_STATIC_LIBRARIES pcap)
- cmake_pop_check_state()
- endif(NOT WIN32)
-endif(PCAP_CONFIG)
-
-include(FindPackageHandleStandardArgs)
-find_package_handle_standard_args(PCAP
- DEFAULT_MSG
- PCAP_INCLUDE_DIRS
- PCAP_LIBRARIES
-)
-
-mark_as_advanced(
- PCAP_INCLUDE_DIR
- PCAP_LIBRARY
- PCAP_STATIC_LIBRARY
-)
+ find_library(PCAP_STATIC_LIBRARY pcap)
+ set(CMAKE_FIND_LIBRARY_SUFFIXES "${SAVED_CMAKE_FIND_LIBRARY_SUFFIXES}")
+
+ #
+ # This will fail if REQUIRED is set and PCAP_INCLUDE_DIR or
+ # PCAP_LIBRARY aren't set.
+ #
+ include(FindPackageHandleStandardArgs)
+ find_package_handle_standard_args(PCAP
+ DEFAULT_MSG
+ PCAP_INCLUDE_DIR
+ PCAP_LIBRARY
+ )
+
+ mark_as_advanced(
+ PCAP_INCLUDE_DIR
+ PCAP_LIBRARY
+ PCAP_STATIC_LIBRARY
+ )
+
+ if(PCAP_FOUND)
+ set(PCAP_INCLUDE_DIRS ${PCAP_INCLUDE_DIR})
+ set(PCAP_LIBRARIES ${PCAP_LIBRARY})
+ set(PCAP_STATIC_LIBRARIES ${PCAP_STATIC_LIBRARY})
+ endif(PCAP_FOUND)
+ endif(CONFIG_PCAP_FOUND)
+endif(WIN32)
projects / tcpdump / blobdiff