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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, if it's a version less than 3.10, require only
# 3.5, 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 3.10, so we don't get messages warning
# that support for versions of CMake lower than 3.10 is
# deprecated.
#
if(CMAKE_VERSION VERSION_LESS "3.5")
cmake_minimum_required(VERSION 2.8.12)
elseif(CMAKE_VERSION VERSION_LESS "3.10")
cmake_minimum_required(VERSION 3.5)
else()
cmake_minimum_required(VERSION 3.10)
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}")
#
# Show the bit width for which we're compiling.
# This can help debug problems if you're dealing with a compiler that
# defaults to generating 32-bit code even when running on a 64-bit
# platform, and where that platform may provide only 64-bit versions of
# libraries that we might use (looking at *you*, Oracle Studio!).
#
if(CMAKE_SIZEOF_VOID_P EQUAL 4)
message(STATUS "Building 32-bit")
elseif(CMAKE_SIZEOF_VOID_P EQUAL 8)
message(STATUS "Building 64-bit")
endif()
#
# Solaris pkg-config is annoying. For at least one package (D-Bus, I'm
# looking at *you*!), there are separate include files for 32-bit and
# 64-bit builds (I guess using "unsigned long long" as a 64-bit integer
# type on a 64-bit build is like crossing the beams or something), and
# there are two separate .pc files, so if we're doing a 32-bit build we
# should make sure we look in /usr/lib/pkgconfig for .pc files and if
# we're doing a 64-bit build we should make sure we look in
# /usr/lib/amd64/pkgconfig for .pc files.
#
if(CMAKE_SYSTEM_NAME STREQUAL "SunOS" AND CMAKE_SYSTEM_VERSION MATCHES "5[.][0-9.]*")
#
# Note: string(REPLACE) does not appear to support using ENV{...}
# as an argument, so we set a variable and then use set() to set
# the environment variable.
#
if(CMAKE_SIZEOF_VOID_P EQUAL 8)
#
# 64-bit build. If /usr/lib/pkgconfig appears in the path,
# prepend /usr/lib/amd64/pkgconfig to it; otherwise,
# put /usr/lib/amd64 at the end.
#
if((NOT DEFINED ENV{PKG_CONFIG_PATH}) OR "$ENV{PKG_CONFIG_PATH}" EQUAL "")
#
# Not set, or empty. Set it to /usr/lib/amd64/pkgconfig.
#
set(fixed_path "/usr/lib/amd64/pkgconfig")
elseif("$ENV{PKG_CONFIG_PATH}" MATCHES "/usr/lib/pkgconfig")
#
# It contains /usr/lib/pkgconfig. Prepend
# /usr/lib/amd64/pkgconfig to /usr/lib/pkgconfig.
#
string(REPLACE "/usr/lib/pkgconfig"
"/usr/lib/amd64/pkgconfig:/usr/lib/pkgconfig"
fixed_path "$ENV{PKG_CONFIG_PATH}")
else()
#
# Not empty, but doesn't contain /usr/lib/pkgconfig.
# Append /usr/lib/amd64/pkgconfig to it.
#
set(fixed_path "$ENV{PKG_CONFIG_PATH}:/usr/lib/amd64/pkgconfig")
endif()
set(ENV{PKG_CONFIG_PATH} "${fixed_path}")
elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
#
# 32-bit build. If /usr/amd64/lib/pkgconfig appears in the path,
# prepend /usr/lib/pkgconfig to it.
#
if("$ENV{PKG_CONFIG_PATH}" MATCHES "/usr/lib/amd64/pkgconfig")
#
# It contains /usr/lib/amd64/pkgconfig. Prepend
# /usr/lib/pkgconfig to /usr/lib/amd64/pkgconfig.
#
string(REPLACE "/usr/lib/amd64/pkgconfig"
"/usr/lib/pkgconfig:/usr/lib/amd64/pkgconfig"
fixed_path "$ENV{PKG_CONFIG_PATH}")
set(ENV{PKG_CONFIG_PATH} "${fixed_path}")
endif()
endif()
endif()
#
# 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)
#
# CMake's definition of "cross-compiling" appears to be "compiling
# for an *operating system* other than the one on which the build
# is being done*.
#
# This is an inadequate definition, as people build for the same
# operating system but a different instruction set, e.g. building
# on an IA-32 or x86-64 Linux box for an Arm embedded Linux box,
# or building Arm code on an IA-32 or x86-64 Windows box.
#
# So just test whether check_c_source_runs() on a trivial program
# works; if not, it's probably because the generated code won't
# run on the platform on which we're running.
#
include(CheckCSourceRuns)
if (NOT CMAKE_CROSSCOMPILING)
check_c_source_runs("
int main()
{
return 0;
}
"
CHECK_C_SOURCE_RUNS_WORKS
)
if (NOT CHECK_C_SOURCE_RUNS_WORKS)
set(CMAKE_CROSSCOMPILING TRUE)
endif()
endif()
###################################################################
# 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()
#
# Test for ONC RPC headers.
#
# XXX - we should supply copies of these, as I think Sun released them
# under a sufficiently permissive license, and that would be one less
# place where we rely on OS headers, rather than our own headers, for
# a protocol that is specified independent of any particular OS.
#
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()
if (NOT CMAKE_CROSSCOMPILING)
#
# Require a proof of suitable snprintf(3), same as in Autoconf.
#
check_c_source_runs("
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#if defined(_WIN32) && !defined(_SSIZE_T_DEFINED)
/*
* On UN*Xes, this is a signed integer type of the same size as size_t.
*
* It's not defined by Visual Studio; we assume that ptrdiff_t will
* be a type that is a signed integer type of the same size as size_t.
*/
typedef ptrdiff_t ssize_t;
#endif
/*
* Avoid trying to cast negative values to unsigned types, or doing
* shifts of signed types, in order not to have the test program fail
* if we're building with undefined-behavior sanitizers enabled.
*/
int main()
{
char buf[100];
unsigned int ui = sizeof(buf);
int i = sizeof(buf);
int64_t i64 = INT64_C(0x100000000);
uint64_t ui64 = UINT64_C(0x100000000);
snprintf(buf, sizeof(buf), \"%zu\", (size_t)ui);
if (strncmp(buf, \"100\", sizeof(buf)))
return 1;
snprintf(buf, sizeof(buf), \"%zd\", (ssize_t)(-i));
if (strncmp(buf, \"-100\", sizeof(buf)))
return 2;
snprintf(buf, sizeof(buf), \"%\" PRId64, -i64);
if (strncmp(buf, \"-4294967296\", sizeof(buf)))
return 3;
snprintf(buf, sizeof(buf), \"0o%\" PRIo64, ui64);
if (strncmp(buf, \"0o40000000000\", sizeof(buf)))
return 4;
snprintf(buf, sizeof(buf), \"0x%\" PRIx64, ui64);
if (strncmp(buf, \"0x100000000\", sizeof(buf)))
return 5;
snprintf(buf, sizeof(buf), \"%\" PRIu64, ui64);
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()
else()
message(STATUS "Skipped SUITABLE_SNPRINTF because cross-compiling.")
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)
#
# Check for various functions in libpcap/WinPcap/Npcap.
#
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES ${PCAP_LIBRARIES})
#
# 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.
#
# We require those routines, so fail if we don't find it.
#
check_function_exists(pcap_create HAVE_PCAP_CREATE)
if(NOT HAVE_PCAP_CREATE)
if(WIN32)
MESSAGE(FATAL_ERROR "libpcap is too old; 1.0 or later is required")
else(WIN32)
MESSAGE(FATAL_ERROR "libpcap is too old; 1.0 or later is required - if you're using WinPcap, try Npcap")
endif(WIN32)
endif(NOT HAVE_PCAP_CREATE)
if(WIN32)
#
# 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(NOT HAVE_PCAP_STATUSTOSTR)
MESSAGE(FATAL_ERROR "pcap_create is available, but pcap_statustostr isn't - if you're using WinPcap, try Npcap ")
endif(NOT HAVE_PCAP_STATUSTOSTR)
endif(WIN32)
#
# 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)
#
# Check for a miscellaneous collection of functions which we use
# if we have them.
#
check_function_exists(pcap_set_immediate_mode HAVE_PCAP_SET_IMMEDIATE_MODE)
check_function_exists(pcap_dump_ftell64 HAVE_PCAP_DUMP_FTELL64)
#
# macOS Sonoma's libpcap includes stub versions of the remote-
# capture APIs. They are exported as "weakly linked symbols".
#
# Xcode 15 offers only a macOS Sonoma SDK, which has a .tbd
# file for libpcap that claims it includes those APIs. (Newer
# versions of macOS don't provide the system shared libraries,
# they only provide the dyld shared cache containing those
# libraries, so the OS provides SDKs that include a .tbd file
# to use when linking.)
#
# This means that check_function_exists() will think that
# the remote-capture APIs are present, including pcap_open()
# and pcap_findalldevs_ex().
#
# However, they are *not* present in macOS Ventura and earlier,
# which means that building on Ventura with Xcode 15 produces
# executables that fail to start because one of those APIs
# isn't found in the system libpcap.
#
# Protecting calls to those APIs with __builtin_available()
# does not prevent this, because the libpcap header files
# in the Sonoma SDK mark them as being first available
# in macOS 10.13, just like all the other routines introduced
# in libpcap 1.9, even though they're only available if libpcap
# is built with remote capture enabled or stub routines are
# provided. (A fix to enable this has been checked into the
# libpcap repository, and may end up in a later version of
# the SDK.)
#
# Given all that, and given that the versions of the
# remote-capture APIs in Sonoma are stubs that always fail,
# there doesn't seem to be any point in checking for pcap_open()
# and pcap_findalldevs_ex() if we're linking against the Apple libpcap.
#
# However, if we're *not* linking against the Apple libpcap,
# we should check for it, so that we can use it if it's present.
#
# So we check for pcap_open() and pcap_findalldevs_ex() if 1) this isn't
# macOS or 2) the the libpcap we found is not a system library, meaning
# that its path begins neither with /usr/lib (meaning it's a system
# dylib) nor /Application/Xcode.app (meaning it's a file in
# the Xcode SDK).
#
if(NOT APPLE OR NOT
(PCAP_LIBRARIES MATCHES "/usr/lib/.*" OR
PCAP_LIBRARIES MATCHES "/Application/Xcode.app/.*"))
check_function_exists(pcap_open HAVE_PCAP_OPEN)
check_function_exists(pcap_findalldevs_ex HAVE_PCAP_FINDALLDEVS_EX)
endif()
#
# 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)
#
# bpf_dump() moved from tcpdump to libpcap in libpcap 0.6, but not all
# versions of libpcap didn't pick that change up; the OpenBSD libpcap
# picked up most of the new APIs from versions up to 1.0, but didn't
# pick up bpf_dump(), so we need to provide it if it's absent.
#
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} ${SMI_LIBRARIES})
set(USE_LIBSMI ON)
endif(SMI_FOUND)
endif(WITH_SMI)
#
# OpenSSL/libressl libcrypto.
#
if(WITH_CRYPTO)
find_package(CRYPTO)
if(CRYPTO_FOUND)
#
# 1) do we have EVP_CIPHER_CTX_new?
# If so, we use it to allocate an EVP_CIPHER_CTX, as
# EVP_CIPHER_CTX may be opaque; otherwise, we allocate
# it ourselves.
#
cmake_push_check_state()
set(CMAKE_REQUIRED_LIBRARIES "${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)