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CMakeLists.txt
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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:
#
# if this is a version of CMake less than 3.5, require only
# 2.8.12, 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;
#
# otherwise, require 3.5, so we don't get messages warning
# that support for versions of CMake lower than 3.5 is
# deprecated.
#
if(CMAKE_VERSION VERSION_LESS "3.5")
cmake_minimum_required(VERSION 2.8.12)
else()
cmake_minimum_required(VERSION 3.5)
endif()
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
# definitely 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 ${CMAKE_SOURCE_DIR}/cmake/Modules)
#
# We explicitly indicate what languages are used in tcpdump to avoid
# checking for a C++ compiler.
#
# One reason to avoid that check is that there's no need to waste
# configuration time performing it.
#
# Another reason is that:
#
# CMake will try to determine the sizes of some data types, including
# void *, early in the process of configuration; apparently, it's done
# as part of processing the project() command.
#
# At least as of CMake 2.8.6, it does so by checking the size of
# "void *" in C, setting CMAKE_C_SIZEOF_DATA_PTR based on that,
# setting CMAKE_SIZEOF_VOID_P to that, and then checking the size
# of "void *" in C++, setting CMAKE_CXX_SIZEOF_DATA_PTR based on
# that, and then setting CMAKE_SIZEOF_VOID_P to *that*.
#
# The compile tests include whatever C flags may have been provided
# to CMake in the CFLAGS and CXXFLAGS environment variables.
#
# If you set an architecture flag such as -m32 or -m64 in CFLAGS
# but *not* in CXXFLAGS, the size for C++ will win, and hilarity
# will ensue.
#
# Or if, at least on Solaris, you have a newer version of GCC
# installed, but *not* a newer version of G++, and you have Oracle
# Studio installed, it will find GCC, which will default to building
# 64-bit, and Oracle Studio's C++ compiler, which will default to
# building 32-bit, the size for C++ will win, and, again, hilarity
# will ensue.
#
project(tcpdump C)
#
# Export the size of void * as SIZEOF_VOID_P so that it can be
# tested with #if.
#
set(SIZEOF_VOID_P "${CMAKE_SIZEOF_VOID_P}")
#
# 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_<LANG>_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
######################################
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)
#
# Get the size of a time_t, to know whether it's 32-bit or 64-bit.
#
cmake_push_check_state()
set(CMAKE_EXTRA_INCLUDE_FILES time.h)
check_type_size("time_t" SIZEOF_TIME_T)
cmake_pop_check_state()
#
# Header files.
#
check_include_file(rpc/rpc.h HAVE_RPC_RPC_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(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)
check_library_exists(network gethostbyaddr "" LIBNETWORK_HAS_GETHOSTBYADDR)
if(LIBNETWORK_HAS_GETHOSTBYADDR)
set(TCPDUMP_LINK_LIBRARIES ${TCPDUMP_LINK_LIBRARIES} network)
else(LIBNETWORK_HAS_GETHOSTBYADDR)
message(FATAL_ERROR "gethostbyaddr is required, but wasn't found")
endif(LIBNETWORK_HAS_GETHOSTBYADDR)
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()
#
# Require a proof of suitable snprintf(3), same as in Autoconf.
#
include(CheckCSourceRuns)
check_c_source_runs("
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
int main()
{
char buf[100];
uint64_t t = (uint64_t)1 << 32;
snprintf(buf, sizeof(buf), \"%zu\", sizeof(buf));
if (strncmp(buf, \"100\", sizeof(buf)))
return 1;
snprintf(buf, sizeof(buf), \"%zd\", -sizeof(buf));
if (strncmp(buf, \"-100\", sizeof(buf)))
return 2;
snprintf(buf, sizeof(buf), \"%\" PRId64, -t);
if (strncmp(buf, \"-4294967296\", sizeof(buf)))
return 3;
snprintf(buf, sizeof(buf), \"0o%\" PRIo64, t);
if (strncmp(buf, \"0o40000000000\", sizeof(buf)))
return 4;
snprintf(buf, sizeof(buf), \"0x%\" PRIx64, t);
if (strncmp(buf, \"0x100000000\", sizeof(buf)))
return 5;
snprintf(buf, sizeof(buf), \"%\" PRIu64, t);
if (strncmp(buf, \"4294967296\", sizeof(buf)))
return 6;
return 0;
}
"
SUITABLE_SNPRINTF
)
if(NOT SUITABLE_SNPRINTF)
message(FATAL_ERROR
"The snprintf(3) implementation in this libc is not suitable,
tcpdump would not work correctly even if it managed to compile."
)
endif()
check_function_exists(getopt_long HAVE_GETOPT_LONG)
#
# 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 <net/ethernet.h>.
# Some might have it and declare it in <netinet/ether.h>
# Some might have it and declare it in <sys/ethernet.h>.
# Some might have it and declare it in <arpa/inet.h>.
# Some might have it and declare it in <netinet/if_ether.h>.
# 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 <net/ethernet.h>?
#
# This test fails if we don't have <net/ethernet.h> 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 <netinet/ether.h>, as on Linux?
#
# This test fails if we don't have <netinet/ether.h>
# 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 <sys/ethernet.h>, as on Solaris 10 and later?
#
# This test fails if we don't have <sys/ethernet.h>
# 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 <arpa/inet.h>, as on AIX?
#
# This test fails if we don't have <arpa/inet.h>
# 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 <netinet/if_ether.h>?
# On some platforms, it requires <net/if.h> and
# <netinet/in.h>, and we always include it with
# both of them, so test it with both of them.
#
# This test fails if we don't have <netinet/if_ether.h>
# and the headers we include before it, or if we do but
# <netinet/if_ether.h> 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<netinet/if_ether.h>?
#
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.
#
######################################
# 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)
#
# At compile time HAVE_PCAP_FINDALLDEVS depends on HAVE_PCAP_IF_T.
#
cmake_push_check_state()
set(CMAKE_EXTRA_INCLUDE_FILES pcap.h)
check_type_size(pcap_if_t PCAP_IF_T)
cmake_pop_check_state()
#
# 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)
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()
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 overlaid on packet
# data, and in those every element is an array of octets so
# that we have full control over the size and alignment, and,
# apparently, jmp_buf has such a declaration on x86, meaning