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+# - Try to find libpcap include dirs and libraries
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+#
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+# Usage of this module as follows:
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+#
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+# find_package(PCAP)
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+#
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+# Variables used by this module, they can change the default behaviour and need
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+# to be set before calling find_package:
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+#
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+# PCAP_ROOT_DIR Set this variable to the root installation of
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+# libpcap if the module has problems finding the
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+# proper installation path.
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+#
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+# Variables defined by this module:
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+#
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+# PCAP_FOUND System has libpcap, include and library dirs found
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+# PCAP_INCLUDE_DIR The libpcap include directories.
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+# PCAP_LIBRARY The libpcap library (possibly includes a thread
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+# library e.g. required by pf_ring's libpcap)
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+# HAVE_PF_RING If a found version of libpcap supports PF_RING
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+
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+find_path(PCAP_ROOT_DIR
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+ NAMES include/pcap.h
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+ )
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+
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+find_path(PCAP_INCLUDE_DIR
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+ NAMES pcap.h
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+ HINTS ${PCAP_ROOT_DIR}/include
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+ )
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+
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+find_library(PCAP_LIBRARY
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+ NAMES pcap
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+ HINTS ${PCAP_ROOT_DIR}/lib
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+ )
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+
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+include(FindPackageHandleStandardArgs)
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+find_package_handle_standard_args(PCAP DEFAULT_MSG
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+ PCAP_LIBRARY
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+ PCAP_INCLUDE_DIR
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+ )
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+
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+include(CheckCSourceCompiles)
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+set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY})
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+check_c_source_compiles("int main() { return 0; }" PCAP_LINKS_SOLO)
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+set(CMAKE_REQUIRED_LIBRARIES)
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+
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+# check if linking against libpcap also needs to link against a thread library
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+if (NOT PCAP_LINKS_SOLO)
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+ find_package(Threads)
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+ if (THREADS_FOUND)
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+ set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
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+ check_c_source_compiles("int main() { return 0; }" PCAP_NEEDS_THREADS)
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+ set(CMAKE_REQUIRED_LIBRARIES)
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+ endif ()
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+ if (THREADS_FOUND AND PCAP_NEEDS_THREADS)
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+ set(_tmp ${PCAP_LIBRARY} ${CMAKE_THREAD_LIBS_INIT})
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+ list(REMOVE_DUPLICATES _tmp)
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+ set(PCAP_LIBRARY ${_tmp}
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+ CACHE STRING "Libraries needed to link against libpcap" FORCE)
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+ else ()
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+ message(FATAL_ERROR "Couldn't determine how to link against libpcap")
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+ endif ()
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+endif ()
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+
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+include(CheckFunctionExists)
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+set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY})
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+check_function_exists(pcap_get_pfring_id HAVE_PF_RING)
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+set(CMAKE_REQUIRED_LIBRARIES)
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+
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+mark_as_advanced(
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+ PCAP_ROOT_DIR
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+ PCAP_INCLUDE_DIR
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+ PCAP_LIBRARY
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+)
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