if(WIN32) # # We need 3.12 or later, so that we can set policy CMP0074; see # below. cmake_minimum_required(VERSION 3.12) else(WIN32) # # For now, require only 2.8.6, just in case somebody is # configuring with CMake on a "long-term support" version # of some OS and that version supplies an older version of # CMake. # # If this is ever updated to CMake 3.1 or later, remove the # stuff in cmake/Modules/FindPCAP.cmake that appends subdirectories # of directories from CMAKE_PREFIX_PATH to the PKG_CONFIG_PATH # environment variable when running pkg-config, to make sure # it finds any .pc file from there. # cmake_minimum_required(VERSION 2.8.12) endif(WIN32) # # We want find_path() and find_library() to honor {packagename}_ROOT, # as that appears to be the standard way to say "hey, look here for # this package" from the command line. # if(POLICY CMP0074) cmake_policy(SET CMP0074 NEW) endif() # # OK, this is a pain. # # When building on NetBSD, with a libpcap installed from pkgsrc, # a -Wl,-rpath,/usr/pkg/lib option is added to the options when # linking tcpdump. This puts /usr/pkg/lib into the run-time path. # # However, by default, CMake adds a rule to the install CMake script # a CMake command (using an undocumented subcommand of file()) that # strips /usr/pkg/lib *out* of the run-time path; the message in the # output for the "install" target is # # -- Set runtime path of "{target-directory}/tcpdump" to "" # # I am not certain what the rationale is for doing this, but a # *consequence* of this is that, when you run the installed tcpdump, # it fails to find libpcap.so: # # $ {target-directory}/tcpdump -h # {target-directory}/tcpdump: Shared object "libpcap.so.0" not found # # It also appears to be the case that, on Ubuntu 22.04, FreeBSD 12, # DragonFly BSD 5.8, OpenBSD 6.6, and Solaris 11.4, # # On Ubuntu and Solaris, even if you have a libpcap in /usr/local, you # have to provide not only -I/usr/local/include and -L/usr/local/lib, # you also must provide -Wl,-rpath,/usr/local/lib in order to have # the run-time linker look in /usr/local/lib for libpcap. If it's not # specified, then, if the shared library major version number of the # libpcap in /usr/lib is the same as the shared major version number # of the libpcap in /usr/local/lib, the run-time linker will find the # libpcap in /usr/lib; if the versions are different, the run-time # linker will fail to find the libpcap in /usr/lib, so the program will # fail to run. # # We suppress this by setting CMAKE_INSTALL_RPATH_USE_LINK_PATH to TRUE; # as the documentation for that variable says: # # Add paths to linker search and installed rpath. # # CMAKE_INSTALL_RPATH_USE_LINK_PATH is a boolean that if set to True # will append to the runtime search path (rpath) of installed # binaries any directories outside the project that are in the linker # search path or contain linked library files. The directories are # appended after the value of the INSTALL_RPATH target property. # # If, for whatever reason, directories in which we search for external # libraries, other than the standard system library directories, are # added to the executable's rpath in the build process, we most # defintely want them in the installed image's rpath if they are # necessary in order to find the libraries at run time. # set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE) set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules) # # OK, this is a royal pain. # # CMake will try to determine the sizes of some data types, including # void *, early in the process of configuration; apparently, it's done # as part of processing the project() command. # # At least as of CMake 2.8.6, it does so by checking the size of # "void *" in C, setting CMAKE_C_SIZEOF_DATA_PTR based on that, # setting CMAKE_SIZEOF_VOID_P to that, and then checking the size # of "void *" in C++, setting CMAKE_CXX_SIZEOF_DATA_PTR based on # that, and then setting CMAKE_SIZEOF_VOID_P to *that*. # # The compile tests include whatever C flags may have been provided # to CMake in the CFLAGS and CXXFLAGS environment variables. # # If you set an architecture flag such as -m32 or -m64 in CFLAGS # but *not* in CXXFLAGS, the size for C++ will win, and hilarity # will ensue. # # Or if, at least on Solaris, you have a newer version of GCC # installed, but *not* a newer version of G++, and you have Oracle # Studio installed, it will find GCC, which will default to building # 64-bit, and Oracle Studio's C++ compiler, which will default to # building 32-bit, the size for C++ will win, and, again, hilarity # will ensue. # # So we *explicitly* state that only C is used; there is currently no # C++ code in tcpdump. # project(tcpdump C) # # For checking if a compiler flag works and adding it if it does. # include(CheckCCompilerFlag) macro(check_and_add_compiler_option _option) message(STATUS "Checking C compiler flag ${_option}") string(REPLACE "=" "-" _temp_option_variable ${_option}) string(REGEX REPLACE "^-" "" _option_variable ${_temp_option_variable}) check_c_compiler_flag("${_option}" ${_option_variable}) if(${${_option_variable}}) set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} ${_option}") endif() endmacro() # # If we're building with Visual Studio, we require Visual Studio 2015, # in order to get sufficient C99 compatibility. Check for that. # # If not, try the appropriate flag for the compiler to enable C99 # features. # set(C_ADDITIONAL_FLAGS "") if(MSVC) if(MSVC_VERSION LESS 1900) message(FATAL_ERROR "Visual Studio 2015 or later is required") endif() # # Treat source files as being in UTF-8 with MSVC if it's not using # the Clang front end. # We assume that UTF-8 source is OK with other compilers and with # MSVC if it's using the Clang front end. # if(NOT ${CMAKE_C_COMPILER} MATCHES "clang*") set(C_ADDITIONAL_FLAGS "${C_ADDITIONAL_FLAGS} /utf-8") endif(NOT ${CMAKE_C_COMPILER} MATCHES "clang*") else(MSVC) # # Try to enable as many C99 features as we can. # At minimum, we want C++/C99-style // comments. # # Newer versions of compilers might default to supporting C99, but # older versions may require a special flag. # # Prior to CMake 3.1, setting CMAKE_C_STANDARD will not have any effect, # so, unless and until we require CMake 3.1 or later, we have to do it # ourselves on pre-3.1 CMake, so we just do it ourselves on all versions # of CMake. # # Note: with CMake 3.1 through 3.5, the only compilers for which CMake # handles CMAKE_C_STANDARD are GCC and Clang. 3.6 adds support only # for Intel C; 3.9 adds support for PGI C, Sun C, and IBM XL C, and # 3.10 adds support for Cray C and IAR C, but no version of CMake has # support for HP C. Therefore, even if we use CMAKE_C_STANDARD with # compilers for which CMake supports it, we may still have to do it # ourselves on other compilers. # # See the CMake documentation for the CMAKE__COMPILER_ID variables # for a list of compiler IDs. # # XXX - this just tests whether the option works and adds it if it does. # We don't test whether it's necessary in order to get the C99 features # that we use; if we ever have a user who tries to compile with a compiler # that can't be made to support those features, we can add a test to make # sure we actually *have* C99 support. # if(CMAKE_C_COMPILER_ID MATCHES "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang") check_and_add_compiler_option("-std=gnu99") elseif(CMAKE_C_COMPILER_ID MATCHES "XL") # # We want support for extensions picked up for GNU C compatibility, # so we use -qlanglvl=extc99. # check_and_add_compiler_option("-qlanglvl=extc99") elseif(CMAKE_C_COMPILER_ID MATCHES "HP") check_and_add_compiler_option("-AC99") elseif(CMAKE_C_COMPILER_ID MATCHES "Sun") check_and_add_compiler_option("-xc99") elseif(CMAKE_C_COMPILER_ID MATCHES "Intel") check_and_add_compiler_option("-c99") endif() endif(MSVC) set(LIBRARY_NAME netdissect) ################################################################### # Parameters ################################################################### option(WITH_SMI "Build with libsmi, if available" ON) option(WITH_CRYPTO "Build with OpenSSL/libressl libcrypto, if available" ON) option(WITH_CAPSICUM "Build with Capsicum security functions, if available" ON) option(WITH_CAP_NG "Use libcap-ng, if available" ON) option(ENABLE_SMB "Build with the SMB dissector" OFF) # # String parameters. Neither of them are set, initially; only if the # user explicitly configures them are they set. # # WITH_CHROOT is STRING, not PATH, as the directory need not exist # when CMake is run. # set(WITH_CHROOT CACHE STRING "Directory to which to chroot when dropping privileges") set(WITH_USER CACHE STRING "User to whom to set the UID when dropping privileges") # # By default, build universal with the appropriate set of architectures # for the OS on which we're doing the build. # if(APPLE AND "${CMAKE_OSX_ARCHITECTURES}" STREQUAL "") # # Get the major version of Darwin. # string(REGEX MATCH "^([0-9]+)" SYSTEM_VERSION_MAJOR "${CMAKE_SYSTEM_VERSION}") if(SYSTEM_VERSION_MAJOR EQUAL 9) # # Leopard. Build for x86 and 32-bit PowerPC, with # x86 first. (That's what Apple does.) # set(CMAKE_OSX_ARCHITECTURES "i386;ppc") elseif(SYSTEM_VERSION_MAJOR EQUAL 10) # # Snow Leopard. Build for x86-64 and x86, with # x86-64 first. (That's what Apple does.) # set(CMAKE_OSX_ARCHITECTURES "x86_64;i386") endif() endif() ################################################################### # Versioning ################################################################### # Get, parse, format and set tcpdump's version string from # [tcpdump_root]/VERSION for later use. # Get MAJOR, MINOR, PATCH & SUFFIX file(STRINGS ${tcpdump_SOURCE_DIR}/VERSION PACKAGE_VERSION LIMIT_COUNT 1 # Read only the first line ) ###################################### # Project settings ###################################### add_definitions(-DHAVE_CONFIG_H) include_directories( ${CMAKE_CURRENT_BINARY_DIR} ${tcpdump_SOURCE_DIR} ) if(MSVC) add_definitions(-D__STDC__) add_definitions(-D_CRT_SECURE_NO_WARNINGS) endif(MSVC) if(MSVC) if (USE_STATIC_RT) MESSAGE(STATUS "Use STATIC runtime") set(NAME_RT MT) set (CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} /MT") set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /MT") set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MT") set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MTd") set (CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL} /MT") set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} /MT") set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /MT") set (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /MTd") else (USE_STATIC_RT) MESSAGE(STATUS "Use DYNAMIC runtime") set(NAME_RT MD) set (CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} /MD") set (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} /MD") set (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /MD") set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /MDd") set (CMAKE_C_FLAGS_MINSIZEREL "${CMAKE_C_FLAGS_MINSIZEREL} /MD") set (CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} /MD") set (CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /MD") set (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} /MDd") endif (USE_STATIC_RT) endif(MSVC) ################################################################### # Detect available platform features ################################################################### include(CMakePushCheckState) include(CheckIncludeFile) include(CheckIncludeFiles) include(CheckFunctionExists) include(CheckLibraryExists) include(CheckSymbolExists) include(CheckStructHasMember) include(CheckVariableExists) include(CheckTypeSize) # # Header files. # check_include_file(fcntl.h HAVE_FCNTL_H) check_include_file(rpc/rpc.h HAVE_RPC_RPC_H) check_include_file(net/if.h HAVE_NET_IF_H) if(HAVE_RPC_RPC_H) check_include_files("rpc/rpc.h;rpc/rpcent.h" HAVE_RPC_RPCENT_H) endif(HAVE_RPC_RPC_H) # # Functions. # check_function_exists(strlcat HAVE_STRLCAT) check_function_exists(strlcpy HAVE_STRLCPY) check_function_exists(strdup HAVE_STRDUP) check_function_exists(strsep HAVE_STRSEP) # # Find library needed for gethostbyaddr. # NOTE: if you hand check_library_exists as its last argument a variable # that's been set, it skips the test, so we need different variables. # set(TCPDUMP_LINK_LIBRARIES "") if(WIN32) # # We need winsock2.h and ws2tcpip.h. # cmake_push_check_state() set(CMAKE_REQUIRED_LIBRARIES ws2_32) check_symbol_exists(gethostbyaddr "winsock2.h;ws2tcpip.h" LIBWS2_32_HAS_GETHOSTBYADDR) cmake_pop_check_state() if(LIBWS2_32_HAS_GETHOSTBYADDR) set(TCPDUMP_LINK_LIBRARIES ws2_32 ${TCPDUMP_LINK_LIBRARIES}) else(LIBWS2_32_HAS_GETHOSTBYADDR) message(FATAL_ERROR "gethostbyaddr is required, but wasn't found") endif(LIBWS2_32_HAS_GETHOSTBYADDR) else(WIN32) check_function_exists(gethostbyaddr STDLIBS_HAVE_GETHOSTBYADDR) if(NOT STDLIBS_HAVE_GETHOSTBYADDR) check_library_exists(socket gethostbyaddr "" LIBSOCKET_HAS_GETHOSTBYADDR) if(LIBSOCKET_HAS_GETHOSTBYADDR) set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} socket) else(LIBSOCKET_HAS_GETHOSTBYADDR) check_library_exists(nsl gethostbyaddr "" LIBNSL_HAS_GETHOSTBYADDR) if(LIBNSL_HAS_GETHOSTBYADDR) set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} nsl) else(LIBNSL_HAS_GETHOSTBYADDR) message(FATAL_ERROR "gethostbyaddr is required, but wasn't found") endif(LIBNSL_HAS_GETHOSTBYADDR) endif(LIBSOCKET_HAS_GETHOSTBYADDR) endif(NOT STDLIBS_HAVE_GETHOSTBYADDR) endif(WIN32) # # This may require additional libraries. # cmake_push_check_state() set(CMAKE_REQUIRED_LIBRARIES ${TCPDUMP_LINK_LIBRARIES}) check_function_exists(getservent STDLIBS_HAVE_GETSERVENT) if(STDLIBS_HAVE_GETSERVENT) set(HAVE_GETSERVENT TRUE) else(STDLIBS_HAVE_GETSERVENT) # # Some platforms may need -lsocket for getservent. # set(CMAKE_REQUIRED_LIBRARIES socket ${TCPDUMP_LINK_LIBRARIES}) check_function_exists(getservent LIBSOCKET_HAS_GETSERVENT) if(LIBSOCKET_HAS_GETSERVENT) set(HAVE_GETSERVENT TRUE) set(TCPDUMP_LINK_LIBRARIES socket ${TCPDUMP_LINK_LIBRARIES}) endif(LIBSOCKET_HAS_GETSERVENT) endif(STDLIBS_HAVE_GETSERVENT) cmake_pop_check_state() # # Make sure we have vsnprintf() and snprintf(); we require them. # We use check_symbol_exists(), as they aren't necessarily external # functions - in Visual Studio, for example, they're inline functions # calling a common external function. # check_symbol_exists(vsnprintf "stdio.h" HAVE_VSNPRINTF) if(NOT HAVE_VSNPRINTF) message(FATAL_ERROR "vsnprintf() is required but wasn't found") endif(NOT HAVE_VSNPRINTF) check_symbol_exists(snprintf "stdio.h" HAVE_SNPRINTF) if(NOT HAVE_SNPRINTF) message(FATAL_ERROR "snprintf() is required but wasn't found") endif() check_function_exists(getopt_long HAVE_GETOPT_LONG) check_function_exists(setlinebuf HAVE_SETLINEBUF) # # For Windows, don't need to waste time checking for fork() or vfork(). # if(NOT WIN32) check_function_exists(fork HAVE_FORK) check_function_exists(vfork HAVE_VFORK) endif(NOT WIN32) # # Some platforms may need -lnsl for getrpcbynumber. # cmake_push_check_state() set(CMAKE_REQUIRED_LIBRARIES ${TCPDUMP_LINK_LIBRARIES}) check_function_exists(getrpcbynumber STDLIBS_HAVE_GETRPCBYNUMBER) if(STDLIBS_HAVE_GETRPCBYNUMBER) set(HAVE_GETRPCBYNUMBER TRUE) else(STDLIBS_HAVE_GETRPCBYNUMBER) set(CMAKE_REQUIRED_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} nsl) check_function_exists(getrpcbynumber LIBNSL_HAS_GETRPCBYNUMBER) if(LIBNSL_HAS_GETRPCBYNUMBER) set(HAVE_GETRPCBYNUMBER TRUE) set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} nsl) endif(LIBNSL_HAS_GETRPCBYNUMBER) endif(STDLIBS_HAVE_GETRPCBYNUMBER) cmake_pop_check_state() # # This requires the libraries we require, as ether_ntohost might be # in one of those libraries. That means we have to do this after # we check for those libraries. # # You are in a twisty little maze of UN*Xes, all different. # Some might not have ether_ntohost(). # Some might have it and declare it in . # Some might have it and declare it in # Some might have it and declare it in . # Some might have it and declare it in . # Some might have it and declare it in . # Some might have it and not declare it in any header file. # # Before you is a C compiler. # cmake_push_check_state() set(CMAKE_REQUIRED_LIBRARIES ${TCPDUMP_LINK_LIBRARIES}) check_function_exists(ether_ntohost HAVE_ETHER_NTOHOST) if(HAVE_ETHER_NTOHOST) # # OK, we have ether_ntohost(). We don't check whether it's buggy, # as we assume any system that has CMake is likely to be new enough # that, if it has ether_ntohost(), whatever bug is checked for in # autotools is fixed; we just decide to use it. # set(USE_ETHER_NTOHOST TRUE) # # Is it declared in ? # # This test fails if we don't have or if we do # but it doesn't declare ether_ntohost(). # check_symbol_exists(ether_ntohost net/ethernet.h NET_ETHERNET_H_DECLARES_ETHER_NTOHOST) if(NET_ETHERNET_H_DECLARES_ETHER_NTOHOST) # # Yes - we have it declared. # set(HAVE_DECL_ETHER_NTOHOST TRUE) endif() # # Did that succeed? # if(NOT HAVE_DECL_ETHER_NTOHOST) # # No - how about , as on Linux? # # This test fails if we don't have # or if we do but it doesn't declare ether_ntohost(). # check_symbol_exists(ether_ntohost netinet/ether.h NETINET_ETHER_H_DECLARES_ETHER_NTOHOST) if(NETINET_ETHER_H_DECLARES_ETHER_NTOHOST) # # Yes - we have it declared. # set(HAVE_DECL_ETHER_NTOHOST TRUE) endif() endif() # # Did that succeed? # if(NOT HAVE_DECL_ETHER_NTOHOST) # # No - how about , as on Solaris 10 and later? # # This test fails if we don't have # or if we do but it doesn't declare ether_ntohost(). # check_symbol_exists(ether_ntohost sys/ethernet.h SYS_ETHERNET_H_DECLARES_ETHER_NTOHOST) if(SYS_ETHERNET_H_DECLARES_ETHER_NTOHOST) # # Yes - we have it declared. # set(HAVE_DECL_ETHER_NTOHOST TRUE) endif() endif() # # Did that succeed? # if(NOT HAVE_DECL_ETHER_NTOHOST) # # No, how about , as on AIX? # # This test fails if we don't have # or if we do but it doesn't declare ether_ntohost(). # check_symbol_exists(ether_ntohost arpa/inet.h ARPA_INET_H_DECLARES_ETHER_NTOHOST) if(ARPA_INET_H_DECLARES_ETHER_NTOHOST) # # Yes - we have it declared. # set(HAVE_DECL_ETHER_NTOHOST TRUE) endif() endif() # # Did that succeed? # if(NOT HAVE_DECL_ETHER_NTOHOST) # # No, how about ? # On some platforms, it requires and # , and we always include it with # both of them, so test it with both of them. # # This test fails if we don't have # and the headers we include before it, or if we do but # doesn't declare ether_ntohost(). # check_symbol_exists(ether_ntohost "sys/types.h;sys/socket.h;net/if.h;netinet/in.h;netinet/if_ether.h" NETINET_IF_ETHER_H_DECLARES_ETHER_NTOHOST) if(NETINET_IF_ETHER_H_DECLARES_ETHER_NTOHOST) # # Yes - we have it declared. # set(HAVE_DECL_ETHER_NTOHOST TRUE) endif() endif() # # After all that, is ether_ntohost() declared? # if(NOT HAVE_DECL_ETHER_NTOHOST) # # No, we'll have to declare it ourselves. # Do we have "struct ether_addr" if we include? # check_struct_has_member("struct ether_addr" octet "sys/types.h;sys/socket.h;net/if.h;netinet/in.h;netinet/if_ether.h" HAVE_STRUCT_ETHER_ADDR) endif() endif() cmake_pop_check_state() # # Data types. # # XXX - there's no check_struct() macro that's like check_struct_has_member() # except that it only checks for the existence of the structure type, # so we use check_struct_has_member() and look for ss_family. # # # Check for IPv6 support. # We just check for AF_INET6 and struct in6_addr. # cmake_push_check_state() if(WIN32) set(CMAKE_EXTRA_INCLUDE_FILES sys/types.h ws2tcpip.h) check_symbol_exists(AF_INET6 "sys/types.h;ws2tcpip.h" HAVE_AF_INET6) else(WIN32) set(CMAKE_EXTRA_INCLUDE_FILES sys/types.h sys/socket.h netinet/in.h) check_symbol_exists(AF_INET6 "sys/types.h;sys/socket.h;netinet/in.h" HAVE_AF_INET6) endif(WIN32) check_type_size("struct in6_addr" HAVE_STRUCT_IN6_ADDR) cmake_pop_check_state() if(HAVE_AF_INET6 AND HAVE_STRUCT_IN6_ADDR) set(HAVE_OS_IPV6_SUPPORT TRUE) endif(HAVE_AF_INET6 AND HAVE_STRUCT_IN6_ADDR) ###################################### # External dependencies ###################################### # # libpcap/WinPcap/Npcap. # First, find it. # find_package(PCAP REQUIRED) include_directories(${PCAP_INCLUDE_DIRS}) cmake_push_check_state() # # Now check headers. # set(CMAKE_REQUIRED_INCLUDES ${PCAP_INCLUDE_DIRS}) # # Check whether we have pcap/pcap-inttypes.h. # If we do, we use that to get the C99 types defined. # check_include_file(pcap/pcap-inttypes.h HAVE_PCAP_PCAP_INTTYPES_H) # # Check for various functions in libpcap/WinPcap/Npcap. # cmake_push_check_state() set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARIES}) # # Check for "pcap_list_datalinks()" and use a substitute version if # it's not present. If it is present, check for "pcap_free_datalinks()"; # if it's not present, we don't replace it for now. (We could do so # on UN*X, but not on Windows, where hilarity ensues if a program # built with one version of the MSVC support library tries to free # something allocated by a library built with another version of # the MSVC support library.) # check_function_exists(pcap_list_datalinks HAVE_PCAP_LIST_DATALINKS) if(HAVE_PCAP_LIST_DATALINKS) check_function_exists(pcap_free_datalinks HAVE_PCAP_FREE_DATALINKS) endif(HAVE_PCAP_LIST_DATALINKS) # # Check for "pcap_datalink_name_to_val()", and use a substitute # version if it's not present. If it is present, check for # "pcap_datalink_val_to_description()", and if we don't have it, # use a substitute version. # check_function_exists(pcap_datalink_name_to_val HAVE_PCAP_DATALINK_NAME_TO_VAL) if(HAVE_PCAP_DATALINK_NAME_TO_VAL) check_function_exists(pcap_datalink_val_to_description HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION) endif(HAVE_PCAP_DATALINK_NAME_TO_VAL) # # Check for "pcap_set_datalink()"; you can't substitute for it if # it's absent (it has hooks into libpcap), so just define the # HAVE_ value if it's there. # check_function_exists(pcap_set_datalink HAVE_PCAP_SET_DATALINK) # # Check for "pcap_breakloop()"; you can't substitute for it if # it's absent (it has hooks into the live capture routines), # so just define the HAVE_ value if it's there. # check_function_exists(pcap_breakloop HAVE_PCAP_BREAKLOOP) # # Check for "pcap_dump_ftell()"; we use a substitute version # if it's not present. # check_function_exists(pcap_dump_ftell HAVE_PCAP_DUMP_FTELL) # # Do we have the new open API? Check for pcap_create() and for # pcap_statustostr(), and assume that, if we have both of them, # we also have pcap_activate() and the other new routines # introduced in libpcap 1.0.0. (We check for pcap_statustostr() # as well, because WinPcap 4.1.3 screwed up and exported pcap_create() # but not other routines such as pcap_statustostr(), even though it # defined them and even though you really want pcap_statustostr() to # get strings corresponding to some of the status returns from the # new routines.) # check_function_exists(pcap_statustostr HAVE_PCAP_STATUSTOSTR) # # If we don't have pcap_statustostr(), don't check for pcap_create(), # so we pretend we don't have it. # if(HAVE_PCAP_STATUSTOSTR) check_function_exists(pcap_create HAVE_PCAP_CREATE) endif(HAVE_PCAP_STATUSTOSTR) if(HAVE_PCAP_CREATE) # # OK, do we have pcap_set_tstamp_type? If so, assume we have # pcap_list_tstamp_types and pcap_free_tstamp_types as well. # check_function_exists(pcap_set_tstamp_type HAVE_PCAP_SET_TSTAMP_TYPE) # # And do we have pcap_set_tstamp_precision? If so, we assume # we also have pcap_open_offline_with_tstamp_precision. # check_function_exists(pcap_set_tstamp_precision HAVE_PCAP_SET_TSTAMP_PRECISION) endif(HAVE_PCAP_CREATE) # # Check for a miscellaneous collection of functions which we use # if we have them. # check_function_exists(pcap_findalldevs HAVE_PCAP_FINDALLDEVS) if(HAVE_PCAP_FINDALLDEVS) # # Check for libpcap having pcap_findalldevs() but the pcap.h header # not having pcap_if_t; some versions of Mac OS X shipped with pcap.h # from 0.6 and libpcap 0.8, so that libpcap had pcap_findalldevs but # pcap.h didn't have pcap_if_t. # cmake_push_check_state() set(CMAKE_REQUIRED_INCLUDES ${PCAP_INCLUDE_DIRS}) set(CMAKE_EXTRA_INCLUDE_FILES pcap.h) check_type_size(pcap_if_t PCAP_IF_T) cmake_pop_check_state() endif(HAVE_PCAP_FINDALLDEVS) check_function_exists(pcap_dump_flush HAVE_PCAP_DUMP_FLUSH) check_function_exists(pcap_lib_version HAVE_PCAP_LIB_VERSION) if(NOT HAVE_PCAP_LIB_VERSION) # Check for the pcap_version string variable and set HAVE_PCAP_VERSION endif(NOT HAVE_PCAP_LIB_VERSION) check_function_exists(pcap_setdirection HAVE_PCAP_SETDIRECTION) check_function_exists(pcap_set_immediate_mode HAVE_PCAP_SET_IMMEDIATE_MODE) check_function_exists(pcap_dump_ftell64 HAVE_PCAP_DUMP_FTELL64) check_function_exists(pcap_open HAVE_PCAP_OPEN) check_function_exists(pcap_findalldevs_ex HAVE_PCAP_FINDALLDEVS_EX) # # On Windows, check for pcap_wsockinit(); if we don't have it, check for # wsockinit(). # if(WIN32) check_function_exists(pcap_wsockinit HAVE_PCAP_WSOCKINIT) if(NOT HAVE_PCAP_WSOCKINIT) check_function_exists(wsockinit HAVE_WSOCKINIT) endif(NOT HAVE_PCAP_WSOCKINIT) endif(WIN32) # # Check for special debugging functions # check_function_exists(pcap_set_parser_debug HAVE_PCAP_SET_PARSER_DEBUG) if(NOT HAVE_PCAP_SET_PARSER_DEBUG) # Check whether libpcap defines pcap_debug or yydebug check_variable_exists(pcap_debug HAVE_PCAP_DEBUG) if(NOT HAVE_PCAP_DEBUG) check_variable_exists(yydebug HAVE_YYDEBUG) endif(NOT HAVE_PCAP_DEBUG) endif(NOT HAVE_PCAP_SET_PARSER_DEBUG) check_function_exists(pcap_set_optimizer_debug HAVE_PCAP_SET_OPTIMIZER_DEBUG) check_function_exists(bpf_dump HAVE_BPF_DUMP) cmake_pop_check_state() # # We have libpcap. # include_directories(SYSTEM ${PCAP_INCLUDE_DIRS}) set(TCPDUMP_LINK_LIBRARIES ${PCAP_LIBRARIES} ${TCPDUMP_LINK_LIBRARIES}) # # Optional libraries. # # # libsmi. # if(WITH_SMI) find_package(SMI) if(SMI_FOUND) include_directories(SYSTEM ${SMI_INCLUDE_DIRS}) set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} ${SMI_LIBRARIES}) set(USE_LIBSMI ON) endif(SMI_FOUND) endif(WITH_SMI) # # OpenSSL/libressl libcrypto. # if(WITH_CRYPTO) find_package(CRYPTO) if(CRYPTO_FOUND) # # Check for some headers and functions. # check_include_file(openssl/evp.h HAVE_OPENSSL_EVP_H) # # 1) do we have EVP_CIPHER_CTX_new? # If so, we use it to allocate an EVP_CIPHER_CTX, as # EVP_CIPHER_CTX may be opaque; otherwise, we allocate # it ourselves. # cmake_push_check_state() set(CMAKE_REQUIRED_LIBRARIES "${CRYPTO_LIBRARIES}") check_function_exists(EVP_CIPHER_CTX_new HAVE_EVP_CIPHER_CTX_NEW) # # 2) do we have EVP_DecryptInit_ex()? # If so, we use it, because we need to be able to make two # "initialize the cipher" calls, one with the cipher and key, # and one with the IV, and, as of OpenSSL 1.1, You Can't Do That # with EVP_DecryptInit(), because a call to EVP_DecryptInit() will # unconditionally clear the context, and if you don't supply a # cipher, it'll clear the cipher, rendering the context unusable # and causing a crash. # check_function_exists(EVP_DecryptInit_ex HAVE_EVP_DECRYPTINIT_EX) cmake_pop_check_state() # # We have libcrypto. # include_directories(SYSTEM ${CRYPTO_INCLUDE_DIRS}) set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} ${CRYPTO_LIBRARIES}) set(HAVE_LIBCRYPTO ON) endif(CRYPTO_FOUND) endif(WITH_CRYPTO) # # Capsicum sandboxing. # Some of this is in the system library, some of it is in other libraries. # if(WITH_CAPSICUM) check_include_files("sys/capsicum.h" HAVE_SYS_CAPSICUM_H) if(HAVE_SYS_CAPSICUM_H) check_function_exists(cap_enter HAVE_CAP_ENTER) check_function_exists(cap_rights_limit HAVE_CAP_RIGHTS_LIMIT) check_function_exists(cap_ioctls_limit HAVE_CAP_IOCTLS_LIMIT) check_function_exists(openat HAVE_OPENAT) if(HAVE_CAP_ENTER AND HAVE_CAP_RIGHTS_LIMIT AND HAVE_CAP_IOCTLS_LIMIT AND HAVE_OPENAT) # # OK, we have the functions we need to support Capsicum. # set(HAVE_CAPSICUM TRUE) # # OK, can we use Casper? # check_library_exists(casper cap_init "" HAVE_CAP_INIT) if(HAVE_CAP_INIT) cmake_push_check_state() set(CMAKE_REQUIRED_LIBRARIES casper) check_library_exists(cap_dns cap_gethostbyaddr "" HAVE_CAP_GETHOSTBYADDR) cmake_pop_check_state() if(HAVE_CAP_GETHOSTBYADDR) set(HAVE_CASPER TRUE) set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} casper cap_dns) endif(HAVE_CAP_GETHOSTBYADDR) endif(HAVE_CAP_INIT) endif(HAVE_CAP_ENTER AND HAVE_CAP_RIGHTS_LIMIT AND HAVE_CAP_IOCTLS_LIMIT AND HAVE_OPENAT) endif(HAVE_SYS_CAPSICUM_H) endif(WITH_CAPSICUM) # # libcap-ng. # if(WITH_CAP_NG) check_include_file(cap-ng.h HAVE_CAP_NG_H) check_library_exists(cap-ng capng_change_id "" HAVE_LIBCAP_NG) if(HAVE_LIBCAP_NG) set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} cap-ng) endif(HAVE_LIBCAP_NG) endif(WITH_CAP_NG) ################################################################### # Warning options ################################################################### # # Check and add warning options if we have a .devel file. # if(EXISTS ${CMAKE_SOURCE_DIR}/.devel OR EXISTS ${CMAKE_BINARY_DIR}/.devel) # # Warning options. # if(MSVC AND NOT ${CMAKE_C_COMPILER} MATCHES "clang*") # # MSVC, with Microsoft's front end and code generator. # "MSVC" is also set for Microsoft's compiler with a Clang # front end and their code generator ("Clang/C2"), so we # check for clang.exe and treat that differently. # check_and_add_compiler_option(-Wall) # # Disable some pointless warnings that /Wall turns on. # # Unfortunately, MSVC does not appear to have an equivalent # to "__attribute__((unused))" to mark a particular function # parameter as being known to be unused, so that the compiler # won't warn about it (for example, the function might have # that parameter because a pointer to it is being used, and # the signature of that function includes that parameter). # C++ lets you give a parameter a type but no name, but C # doesn't have that. # check_and_add_compiler_option(-wd4100) # # In theory, we care whether somebody uses f() rather than # f(void) to declare a function with no arguments, but, in # practice, there are places in the Windows header files # that appear to do that, so we squelch that warning. # check_and_add_compiler_option(-wd4255) # # Windows FD_SET() generates this, so we suppress it. # check_and_add_compiler_option(-wd4548) # # Perhaps testing something #defined to be 0 with #ifdef is an # error, and it should be tested with #if, but perhaps it's # not, and Microsoft does that in its headers, so we squelch # that warning. # check_and_add_compiler_option(-wd4574) # # The Windows headers also test not-defined values in #if, so # we don't want warnings about that, either. # check_and_add_compiler_option(-wd4668) # # We do *not* care whether some function is, or isn't, going to be # expanded inline. # check_and_add_compiler_option(-wd4710) check_and_add_compiler_option(-wd4711) # # We do *not* care whether we're adding padding bytes after # structure members. # check_and_add_compiler_option(-wd4820) # # We do *not* care about every single place the compiler would # have inserted Spectre mitigation if only we had told it to # do so with /Qspectre. I guess the theory is that it's seeing # bounds checks that would prevent out-of-bounds loads and that # those out-of-bounds loads could be done speculatively and that # the Spectre attack could detect the value of the out-of-bounds # data *if* it's within our address space, but unless I'm # missing something I don't see that as being any form of # security hole. # # XXX - add /Qspectre if that is really worth doing. # check_and_add_compiler_option(-wd5045) # # We do *not* care whether a structure had padding added at # the end because of __declspec(align) - *we* don't use # __declspec(align), because the only structures whose layout # we precisely specify are those that get overlayed on packet # data, and in those every element is an array of octets so # that we have full control over the size and aligmnet, and, # apparently, jmp_buf has such a declaration on x86, meaning # that everything that includes netdissect.h, i.e. almost every # file in tcpdump, gets a warning. # check_and_add_compiler_option(-wd4324) else() # # Other compilers, including MSVC with a Clang front end and # Microsoft's code generator. We currently treat them as if # they might support GCC-style -W options. # check_and_add_compiler_option(-W) check_and_add_compiler_option(-Wall) check_and_add_compiler_option(-Wassign-enum) check_and_add_compiler_option(-Wcast-qual) check_and_add_compiler_option(-Wmissing-prototypes) check_and_add_compiler_option(-Wmissing-variable-declarations) check_and_add_compiler_option(-Wold-style-definition) check_and_add_compiler_option(-Wpedantic) check_and_add_compiler_option(-Wpointer-arith) check_and_add_compiler_option(-Wpointer-sign) check_and_add_compiler_option(-Wshadow) check_and_add_compiler_option(-Wsign-compare) check_and_add_compiler_option(-Wstrict-prototypes) check_and_add_compiler_option(-Wunreachable-code-return) check_and_add_compiler_option(-Wused-but-marked-unused) check_and_add_compiler_option(-Wwrite-strings) endif() endif() # # Extra compiler options for the build matrix scripts to request -Werror or # its equivalent if required. The CMake variable name cannot be CFLAGS # because that is already used for a different purpose in CMake. Example # usage: cmake -DEXTRA_CFLAGS='-Wall -Wextra -Werror' ... # if(NOT "${EXTRA_CFLAGS}" STREQUAL "") foreach(_extra_cflag ${EXTRA_CFLAGS}) check_and_add_compiler_option("${_extra_cflag}") endforeach(_extra_cflag) message(STATUS "Added extra compile options (${EXTRA_CFLAGS})") endif() ###################################### # Input files ###################################### if(ENABLE_SMB) # # We allow the SMB dissector to be omitted. # set(LOCALSRC ${LOCALSRC} print-smb.c smbutil.c) endif(ENABLE_SMB) set(NETDISSECT_SOURCE_LIST_C addrtoname.c addrtostr.c af.c ascii_strcasecmp.c checksum.c cpack.c gmpls.c in_cksum.c ipproto.c l2vpn.c machdep.c netdissect.c netdissect-alloc.c nlpid.c oui.c ntp.c parsenfsfh.c print.c print-802_11.c print-802_15_4.c print-ah.c print-ahcp.c print-aodv.c print-aoe.c print-ap1394.c print-arcnet.c print-arista.c print-arp.c print-ascii.c print-atalk.c print-atm.c print-babel.c print-bcm-li.c print-beep.c print-bfd.c print-bgp.c print-bootp.c print-brcmtag.c print-bt.c print-calm-fast.c print-carp.c print-cdp.c print-cfm.c print-chdlc.c print-cip.c print-cnfp.c print-dccp.c print-decnet.c print-dhcp6.c print-domain.c print-dsa.c print-dtp.c print-dvmrp.c print-eap.c print-egp.c print-eigrp.c print-enc.c print-esp.c print-ether.c print-fddi.c print-forces.c print-fr.c print-frag6.c print-ftp.c print-geneve.c print-geonet.c print-gre.c print-hncp.c print-hsrp.c print-http.c print-icmp.c print-icmp6.c print-igmp.c print-igrp.c print-ip-demux.c print-ip.c print-ip6.c print-ip6opts.c print-ipcomp.c print-ipfc.c print-ipnet.c print-ipoib.c print-ipx.c print-isakmp.c print-isoclns.c print-juniper.c print-krb.c print-l2tp.c print-lane.c print-ldp.c print-lisp.c print-llc.c print-lldp.c print-lmp.c print-loopback.c print-lspping.c print-lwapp.c print-lwres.c print-m3ua.c print-macsec.c print-mobile.c print-mobility.c print-mpcp.c print-mpls.c print-mptcp.c print-msdp.c print-msnlb.c print-nflog.c print-nfs.c print-nsh.c print-ntp.c print-null.c print-olsr.c print-openflow-1.0.c print-openflow-1.3.c print-openflow.c print-ospf.c print-ospf6.c print-otv.c print-pflog.c print-pgm.c print-pim.c print-pktap.c print-ppi.c print-ppp.c print-pppoe.c print-pptp.c print-ptp.c print-radius.c print-raw.c print-realtek.c print-resp.c print-rip.c print-ripng.c print-rpki-rtr.c print-rsvp.c print-rt6.c print-rtsp.c print-rx.c print-sctp.c print-sflow.c print-sip.c print-sl.c print-sll.c print-slow.c print-smtp.c print-snmp.c print-someip.c print-ssh.c print-stp.c print-sunatm.c print-sunrpc.c print-symantec.c print-syslog.c print-tcp.c print-telnet.c print-tftp.c print-timed.c print-tipc.c print-token.c print-udld.c print-udp.c print-unsupported.c print-usb.c print-vjc.c print-vqp.c print-vrrp.c print-vsock.c print-vtp.c print-vxlan-gpe.c print-vxlan.c print-wb.c print-whois.c print-zep.c print-zephyr.c print-zeromq.c ${LOCALSRC} signature.c strtoaddr.c util-print.c ) # # Replace missing functions # foreach(FUNC strlcat strlcpy strdup strsep getservent getopt_long) string(TOUPPER ${FUNC} FUNC_UPPERCASE) set(HAVE_FUNC_UPPERCASE HAVE_${FUNC_UPPERCASE}) if(NOT ${HAVE_FUNC_UPPERCASE}) set(NETDISSECT_SOURCE_LIST_C ${NETDISSECT_SOURCE_LIST_C} missing/${FUNC}.c) endif() endforeach() add_library(netdissect STATIC ${NETDISSECT_SOURCE_LIST_C} ) if(NOT C_ADDITIONAL_FLAGS STREQUAL "") set_target_properties(netdissect PROPERTIES COMPILE_FLAGS ${C_ADDITIONAL_FLAGS}) endif() set(TCPDUMP_SOURCE_LIST_C fptype.c tcpdump.c) if(NOT HAVE_BPF_DUMP) set(TCPDUMP_SOURCE_LIST_C ${TCPDUMP_SOURCE_LIST_C} bpf_dump.c) endif(NOT HAVE_BPF_DUMP) if(NOT HAVE_PCAP_DUMP_FTELL) set(TCPDUMP_SOURCE_LIST_C ${TCPDUMP_SOURCE_LIST_C} missing/pcap_dump_ftell.c) endif(NOT HAVE_PCAP_DUMP_FTELL) if(NOT HAVE_PCAP_LIST_DATALINKS) set(TCPDUMP_SOURCE_LIST_C ${TCPDUMP_SOURCE_LIST_C} missing/datalinks.c) endif(NOT HAVE_PCAP_LIST_DATALINKS) if((NOT HAVE_PCAP_DATALINK_NAME_TO_VAL) OR (NOT HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)) set(TCPDUMP_SOURCE_LIST_C ${TCPDUMP_SOURCE_LIST_C} missing/dlnames.c) endif((NOT HAVE_PCAP_DATALINK_NAME_TO_VAL) OR (NOT HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)) set(PROJECT_SOURCE_LIST_C ${NETDISSECT_SOURCE_LIST_C} ${TCPDUMP_SOURCE_LIST_C}) file(GLOB PROJECT_SOURCE_LIST_H *.h ) # # Assume, by default, no support for shared libraries and V7/BSD # convention for man pages (devices in section 4, file formats in # section 5, miscellaneous info in section 7, administrative commands # and daemons in section 8). Individual cases can override this. # Individual cases can override this. # set(MAN_FILE_FORMATS 5) set(MAN_MISC_INFO 7) if(CMAKE_SYSTEM_NAME STREQUAL "AIX") # Workaround to enable certain features set(_SUN TRUE) elseif(CMAKE_SYSTEM_NAME STREQUAL "HP-UX") # # Use System V conventions for man pages. # set(MAN_FILE_FORMATS 4) set(MAN_MISC_INFO 5) elseif(CMAKE_SYSTEM_NAME STREQUAL "IRIX" OR CMAKE_SYSTEM_NAME STREQUAL "IRIX64") # # Use IRIX conventions for man pages; they're the same as the # System V conventions, except that they use section 8 for # administrative commands and daemons. # set(MAN_FILE_FORMATS 4) set(MAN_MISC_INFO 5) elseif(CMAKE_SYSTEM_NAME STREQUAL "OSF1") # # DEC OSF/1, a/k/a Digital UNIX, a/k/a Tru64 UNIX. # Use Tru64 UNIX conventions for man pages; they're the same as the # System V conventions except that they use section 8 for # administrative commands and daemons. # set(MAN_FILE_FORMATS 4) set(MAN_MISC_INFO 5) elseif(CMAKE_SYSTEM_NAME STREQUAL "SunOS" AND CMAKE_SYSTEM_VERSION MATCHES "5[.][0-9.]*") # # SunOS 5.x. # if(CMAKE_SYSTEM_VERSION STREQUAL "5.12") else() # # Use System V conventions for man pages. # set(MAN_FILE_FORMATS 4) set(MAN_MISC_INFO 5) endif() endif() source_group("Source Files" FILES ${PROJECT_SOURCE_LIST_C}) source_group("Header Files" FILES ${PROJECT_SOURCE_LIST_H}) ###################################### # Register targets ###################################### add_executable(tcpdump ${TCPDUMP_SOURCE_LIST_C}) if(NOT C_ADDITIONAL_FLAGS STREQUAL "") set_target_properties(tcpdump PROPERTIES COMPILE_FLAGS ${C_ADDITIONAL_FLAGS}) endif() target_link_libraries(tcpdump netdissect ${TCPDUMP_LINK_LIBRARIES}) ###################################### # Write out the config.h file ###################################### configure_file(${CMAKE_CURRENT_SOURCE_DIR}/cmakeconfig.h.in ${CMAKE_CURRENT_BINARY_DIR}/config.h) ###################################### # Install tcpdump and man pages ###################################### # # "Define GNU standard installation directories", which actually # are also defined, to some degree, by autotools, and at least # some of which are general UN*X conventions. # include(GNUInstallDirs) set(MAN1_EXPAND tcpdump.1.in) if(WIN32) # XXX TODO where to install on Windows? else(WIN32) install(TARGETS tcpdump DESTINATION bin) endif(WIN32) # On UN*X, and on Windows when not using MSVC, process man pages and # arrange that they be installed. if(NOT MSVC) # # Man pages. # # For each section of the manual for which we have man pages # that require macro expansion, do the expansion. # set(MAN1 "") foreach(TEMPLATE_MANPAGE ${MAN1_EXPAND}) string(REPLACE ".in" "" MANPAGE ${TEMPLATE_MANPAGE}) configure_file(${CMAKE_SOURCE_DIR}/${TEMPLATE_MANPAGE} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE} @ONLY) set(MAN1 ${MAN1} ${CMAKE_CURRENT_BINARY_DIR}/${MANPAGE}) endforeach(TEMPLATE_MANPAGE) install(FILES ${MAN1} DESTINATION ${CMAKE_INSTALL_MANDIR}/man1) endif(NOT MSVC) # uninstall target configure_file( "${CMAKE_CURRENT_SOURCE_DIR}/cmake_uninstall.cmake.in" "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake" IMMEDIATE @ONLY) add_custom_target(uninstall COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake) # # Tcpdump tests # We try to find the Perl interpreter and, if we do, we have the check # rule run tests/TESTrun with it, because just trying to run the TESTrun # script as a command won't work on Windows. # find_program(PERL perl) if(PERL) message(STATUS "Found perl at ${PERL}") add_custom_target(check COMMAND ${PERL} ${CMAKE_SOURCE_DIR}/tests/TESTrun) else() message(STATUS "Didn't find perl") endif()