include(CheckFunctionExists)

include(CheckSymbolExists)

include(CheckCSourceCompiles)

include(CheckIncludeFiles)

set(PCAP_OS_LIBRARIES)

if (MSVC)

set(PCAP_OS_LIBRARIES ws2_32.lib Crypt32.lib ${OPENSSL_LIBRARIES})

endif ()

set(CMAKE_REQUIRED_INCLUDES ${PCAP_INCLUDE_DIR})

set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARY} ${PCAP_OS_LIBRARIES})

cmake_policy(PUSH)

if (POLICY CMP0075)

# It's fine that check_include_files links against CMAKE_REQUIRED_LIBRARIES

cmake_policy(SET CMP0075 NEW)

endif ()

check_include_files(pcap-int.h HAVE_PCAP_INT_H)

cmake_policy(POP)

check_symbol_exists(pcap_freecode pcap.h HAVE_LIBPCAP_PCAP_FREECODE)

if (NOT HAVE_LIBPCAP_PCAP_FREECODE)

set(DONT_HAVE_LIBPCAP_PCAP_FREECODE true)

message(STATUS "No implementation for pcap_freecode()")

endif ()

if (DONT_HAVE_LIBPCAP_PCAP_FREECODE AND NOT HAVE_PCAP_INT_H)

message(FATAL_ERROR "pcap-int.h required to implement pcap_freecode() internally")

endif ()

check_symbol_exists(DLT_PPP_SERIAL pcap.h HAVE_DLT_PPP_SERIAL)

if (NOT HAVE_DLT_PPP_SERIAL)

set(DLT_PPP_SERIAL 50)

endif ()

check_symbol_exists(DLT_NFLOG pcap.h HAVE_DLT_NFLOG)

if (NOT HAVE_DLT_NFLOG)

set(DLT_NFLOG 239)

endif ()

check_symbol_exists(DLT_LINUX_SLL2 pcap.h HAVE_DLT_LINUX_SLL2)

if (NOT HAVE_DLT_LINUX_SLL2)

set(DONT_HAVE_LIBPCAP_DLT_LINUX_SLL2 true)

message(STATUS "No DLT_LINUX_SLL2 support in libpcap")

endif ()

set(CMAKE_REQUIRED_INCLUDES)

set(CMAKE_REQUIRED_LIBRARIES)