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configure.ac
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dnl Copyright (c) 1994, 1995, 1996, 1997
dnl The Regents of the University of California. All rights reserved.
dnl
dnl Process this file with autoconf to produce a configure script.
dnl
#
# See
#
# https://ftp.gnu.org/gnu/config/README
#
# for the URLs to use to fetch new versions of config.guess and
# config.sub.
#
AC_PREREQ([2.69])
AC_INIT(
[tcpdump],
[m4_esyscmd_s(cat VERSION)],
[https://github.com/the-tcpdump-group/tcpdump/issues],
[tcpdump],
[https://www.tcpdump.org/])
AC_CONFIG_SRCDIR(tcpdump.c)
AC_CANONICAL_HOST
AC_LBL_C_INIT_BEFORE_CC(V_INCLS)
#
# Try to enable as many C99 features as we can.
# At minimum, we want C++/C99-style // comments.
#
AC_PROG_CC_C99
if test "$ac_cv_prog_cc_c99" = "no"; then
AC_MSG_WARN([The C compiler does not support C99; there may be compiler errors])
fi
AC_LBL_C_INIT(V_CCOPT, V_INCLS)
#
# Test for ONC RPC headers.
#
# XXX - we should supply copies of these, as I think Sun released them
# under a sufficiently permissive license, and that would be one less
# place where we rely on OS headers, rather than our own headers, for
# a protocol that is specified independent of any particular OS.
#
AC_CHECK_HEADERS(rpc/rpc.h rpc/rpcent.h)
# On Linux, if Autoconf version >= 2.72 and GNU C Library version >= 2.34,
# uncomment AC_SYS_YEAR2038_RECOMMENDED to ensure time_t is Y2038-safe.
# (Can be done by autogen.sh)
# AC_SYS_YEAR2038_RECOMMENDED
#
# Get the size of a void *, to know whether this is a 32-bit or 64-bit build.
#
AC_CHECK_SIZEOF([void *])
#
# Get the size of a time_t, to know whether it's 32-bit or 64-bit.
#
AC_CHECK_SIZEOF([time_t],,[#include <time.h>])
case "$host_os" in
darwin*)
AC_ARG_ENABLE(universal,
AS_HELP_STRING([--disable-universal],[don't build universal on macOS]))
if test "$enable_universal" != "no"; then
case "$host_os" in
darwin9.*)
#
# Leopard. Build for x86 and 32-bit PowerPC, with
# x86 first. (That's what Apple does.)
#
V_CCOPT="$V_CCOPT -arch i386 -arch ppc"
LDFLAGS="$LDFLAGS -arch i386 -arch ppc"
;;
darwin10.*)
#
# Snow Leopard. Build for x86-64 and x86, with
# x86-64 first. (That's what Apple does.)
#
V_CCOPT="$V_CCOPT -arch x86_64 -arch i386"
LDFLAGS="$LDFLAGS -arch x86_64 -arch i386"
;;
esac
fi
;;
esac
#
# Do we have pkg-config?
#
PKG_PROG_PKG_CONFIG
#
# Do we have the brew command from Homebrew?
#
case "$host_os" in
darwin*|linux*)
AC_PATH_PROG([BREW], [brew])
;;
esac
AC_ARG_WITH([smi],
[AS_HELP_STRING([--with-smi],
[link with libsmi (allows to load MIBs on the fly to decode SNMP packets) [default=yes, if available]])],
[],
[with_smi=yes])
if test "x$with_smi" != "xno" ; then
AC_CHECK_HEADER(smi.h,
[
#
# OK, we found smi.h. Do we have libsmi with smiInit?
#
AC_CHECK_LIB(smi, smiInit,
[
#
# OK, we have libsmi with smiInit. Can we use it?
#
AC_MSG_CHECKING([whether to enable libsmi])
savedlibs="$LIBS"
LIBS="-lsmi $LIBS"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
/* libsmi available check */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <smi.h>
int main()
{
int current, revision, age, n;
const int required = 2;
if (smiInit(""))
exit(1);
if (strcmp(SMI_LIBRARY_VERSION, smi_library_version))
exit(2);
n = sscanf(smi_library_version, "%d:%d:%d", ¤t, &revision, &age);
if (n != 3)
exit(3);
if (required < current - age || required > current)
exit(4);
exit(0);
}
]])
],
[
AC_MSG_RESULT(yes)
AC_DEFINE(USE_LIBSMI, 1,
[Define if you enable support for libsmi])
],
[
dnl autoconf documentation says that
dnl $? contains the exit value.
dnl reality is that it does not.
dnl We leave this in just in case
dnl autoconf ever comes back to
dnl match the documentation.
case $? in
1) AC_MSG_RESULT(no - smiInit failed) ;;
2) AC_MSG_RESULT(no - header/library version mismatch) ;;
3) AC_MSG_RESULT(no - can't determine library version) ;;
4) AC_MSG_RESULT(no - too old) ;;
*) AC_MSG_RESULT(no) ;;
esac
LIBS="$savedlibs"
],
[
AC_MSG_RESULT(not when cross-compiling)
LIBS="$savedlibs"
]
)
])
])
fi
AC_MSG_CHECKING([whether to enable the instrument functions code])
AC_ARG_ENABLE([instrument-functions],
[AS_HELP_STRING([--enable-instrument-functions],
[enable instrument functions code [default=no]])],
[],
[enableval=no])
case "$enableval" in
yes) AC_MSG_RESULT(yes)
AC_CHECK_LIB([bfd], [bfd_init],
[true],
[AC_MSG_ERROR(
[--enable-instrument-functions was given, but test for library libbfd failed. Please install the 'binutils-dev' package.])],
[])
AC_DEFINE(ENABLE_INSTRUMENT_FUNCTIONS, 1,
[define if you want to build the instrument functions code])
LOCALSRC="$LOCALSRC instrument-functions.c"
# Add '-finstrument-functions' instrumentation option to generate
# instrumentation calls for entry and exit to functions.
# Try to avoid Address Space Layout Randomization (ALSR).
CFLAGS="$CFLAGS -O0 -ggdb -finstrument-functions -fno-stack-protector -fno-pic"
LDFLAGS="$LDFLAGS -O0 -ggdb -fno-stack-protector -no-pie"
LIBS="$LIBS -lbfd"
;;
*) AC_MSG_RESULT(no)
;;
esac
AC_MSG_CHECKING([whether to enable the possibly-buggy SMB printer])
AC_ARG_ENABLE([smb],
[AS_HELP_STRING([--enable-smb],
[enable possibly-buggy SMB printer [default=no]])],
[],
[enableval=no])
case "$enableval" in
yes) AC_MSG_RESULT(yes)
AC_DEFINE(ENABLE_SMB, 1,
[define if you want to build the possibly-buggy SMB printer])
LOCALSRC="print-smb.c smbutil.c $LOCALSRC"
;;
*) AC_MSG_RESULT(no)
;;
esac
AC_MSG_CHECKING([whether to drop root privileges by default])
AC_ARG_WITH(
[user],
[AS_HELP_STRING([--with-user=USERNAME],
[drop privileges by default to USERNAME]
)],
[],
[withval=no])
AS_CASE(["$withval"],
[no], [AC_MSG_RESULT(no)],
[''|yes], [AC_MSG_ERROR([--with-user requires a username])],
[
AC_DEFINE_UNQUOTED(WITH_USER, "$withval",
[define if should drop privileges by default])
AC_MSG_RESULT([yes, to user "$withval"])
]
)
AC_MSG_CHECKING([whether to chroot])
AC_ARG_WITH(
[chroot],
[AS_HELP_STRING([--with-chroot=DIRECTORY],
[when dropping privileges, chroot to DIRECTORY]
)],
[],
[withval=no]
)
AS_CASE(["$withval"],
[no], [AC_MSG_RESULT(no)],
[''|yes], [AC_MSG_ERROR([--with-chroot requires a directory])],
[
AC_DEFINE_UNQUOTED(WITH_CHROOT, "$withval",
[define if should chroot when dropping privileges])
AC_MSG_RESULT([yes, to directory "$withval"])
]
)
AC_ARG_WITH(sandbox-capsicum,
AS_HELP_STRING([--with-sandbox-capsicum],
[use Capsicum security functions @<:@default=yes, if available@:>@]))
# Capsicum is available on FreeBSD only.
expr "$host_os" : freebsd >/dev/null || with_sandbox_capsicum=no
#
# Check whether various functions are available. If any are, set
# ac_lbl_capsicum_function_seen to yes; if any are not, set
# ac_lbl_capsicum_function_not_seen to yes.
#
# We don't check cap_rights_init(), as it's a macro, wrapping another
# function, in at least some versions of FreeBSD, and AC_CHECK_FUNCS()
# doesn't handle that.
#
# All of the ones we check for must be available in order to enable
# capsicum sandboxing.
#
# XXX - do we need to check for all of them, or are there some that, if
# present, imply others are present?
#
if test -z "$with_sandbox_capsicum" || test "$with_sandbox_capsicum" != "no" ; then
#
# First, make sure we have the required header.
#
AC_CHECK_HEADER(sys/capsicum.h,
[
#
# We do; now make sure we have the required functions.
#
AC_CHECK_FUNCS(cap_enter cap_rights_limit cap_ioctls_limit openat,
ac_lbl_capsicum_function_seen=yes,
ac_lbl_capsicum_function_not_seen=yes)
])
AC_CHECK_LIB(casper, cap_init, LIBS="$LIBS -lcasper")
AC_CHECK_LIB(cap_dns, cap_gethostbyaddr, LIBS="$LIBS -lcap_dns")
fi
AC_MSG_CHECKING([whether to sandbox using capsicum])
if test "x$ac_lbl_capsicum_function_seen" = "xyes" -a "x$ac_lbl_capsicum_function_not_seen" != "xyes"; then
AC_DEFINE(HAVE_CAPSICUM, 1, [capsicum support available])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
AC_MSG_CHECKING([whether to sandbox using Casper library])
if test "x$ac_cv_lib_casper_cap_init" = "xyes" -a "x$ac_cv_lib_cap_dns_cap_gethostbyaddr" = "xyes"; then
AC_DEFINE(HAVE_CASPER, 1, [Casper support available])
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
fi
#
# XXX - we used to check this before checking whether to check the OS's
# IPv6, support because, on some platforms (such as SunOS 5.x), the test
# program requires the extra networking libraries. We no longer
# test for IPv6 support, we just assume it's present with the
# standard API, so perhaps this can be moved.
#
AC_LBL_LIBRARY_NET
AC_REPLACE_FUNCS(strlcat strlcpy strsep getservent getopt_long)
AC_CHECK_FUNCS(fork vfork)
#
# It became apparent at some point that using a suitable C99 compiler does not
# automatically mean snprintf(3) implementation in the libc supports all the
# modifiers and specifiers used in the project, so let's test that before the
# build, not after.
#
# Testing the sizeof_t length modifier takes making an snprintf() call and
# comparing the actual result with the expected result. If this fails, it will
# most likely happen at run time, not compile time.
#
# Testing the 64-bit conversion specifiers in addition to that requires the
# <inttypes.h> header to be present and the macros to be defined, so if this
# fails, it will more likely happen at compile time.
#
AC_MSG_CHECKING([whether snprintf is suitable])
AC_RUN_IFELSE(
[
AC_LANG_SOURCE([[
#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;
}
]])
],
[
AC_MSG_RESULT(yes)
],
[
AC_MSG_RESULT(no)
AC_MSG_ERROR(
[The snprintf(3) implementation in this libc is not suitable,
tcpdump would not work correctly even if it managed to compile.])
],
[
AC_MSG_RESULT(not while cross-compiling)
]
)
AC_CHECK_LIB(rpc, main) dnl It's unclear why we might need -lrpc
dnl Some platforms may need -lnsl for getrpcbynumber.
AC_SEARCH_LIBS(getrpcbynumber, nsl,
AC_DEFINE(HAVE_GETRPCBYNUMBER, 1, [define if you have getrpcbynumber()]))
AC_LBL_LIBPCAP(V_PCAPDEP, V_INCLS)
#
# Check for these after AC_LBL_LIBPCAP, so we link with the appropriate
# libraries (e.g., "-lsocket -lnsl" on Solaris).
#
# 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.
#
AC_CHECK_FUNCS(ether_ntohost, [
#
# OK, we have ether_ntohost(). 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().
#
AC_CHECK_DECL(ether_ntohost,
[
AC_DEFINE(NET_ETHERNET_H_DECLARES_ETHER_NTOHOST,1,
[Define to 1 if net/ethernet.h declares `ether_ntohost'])
],,
[
#include <net/ethernet.h>
])
#
# Did that succeed?
#
if test "$ac_cv_have_decl_ether_ntohost" != yes; then
#
# No, how about <netinet/ether.h>, as on Linux?
#
# This test fails if we don't have <netinet/ether.h>
# or if we do but it doesn't declare ether_ntohost().
#
# Unset ac_cv_have_decl_ether_ntohost so we don't
# treat the previous failure as a cached value and
# suppress the next test.
#
unset ac_cv_have_decl_ether_ntohost
AC_CHECK_DECL(ether_ntohost,
[
AC_DEFINE(NETINET_ETHER_H_DECLARES_ETHER_NTOHOST,1,
[Define to 1 if netinet/ether.h declares `ether_ntohost'])
],,
[
#include <netinet/ether.h>
])
fi
#
# Did that succeed?
#
if test "$ac_cv_have_decl_ether_ntohost" != yes; then
#
# 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().
#
# Unset ac_cv_have_decl_ether_ntohost so we don't
# treat the previous failure as a cached value and
# suppress the next test.
#
unset ac_cv_have_decl_ether_ntohost
AC_CHECK_DECL(ether_ntohost,
[
AC_DEFINE(SYS_ETHERNET_H_DECLARES_ETHER_NTOHOST,1,
[Define to 1 if sys/ethernet.h declares `ether_ntohost'])
],,
[
#include <sys/ethernet.h>
])
fi
#
# Did that succeed?
#
if test "$ac_cv_have_decl_ether_ntohost" != yes; then
#
# No, how about <arpa/inet.h>, as in AIX?
#
# This test fails if we don't have <arpa/inet.h>
# (if we have ether_ntohost(), we should have
# networking, and if we have networking, we should
# have <arpa/inet.h>) or if we do but it doesn't
# declare ether_ntohost().
#
# Unset ac_cv_have_decl_ether_ntohost so we don't
# treat the previous failure as a cached value and
# suppress the next test.
#
unset ac_cv_have_decl_ether_ntohost
AC_CHECK_DECL(ether_ntohost,
[
AC_DEFINE(ARPA_INET_H_DECLARES_ETHER_NTOHOST,1,
[Define to 1 if arpa/inet.h declares `ether_ntohost'])
],,
[
#include <arpa/inet.h>
])
fi
#
# Did that succeed?
#
if test "$ac_cv_have_decl_ether_ntohost" != yes; then
#
# 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_hostton().
#
# Unset ac_cv_have_decl_ether_ntohost so we don't
# treat the previous failure as a cached value and
# suppress the next test.
#
unset ac_cv_have_decl_ether_ntohost
AC_CHECK_DECL(ether_ntohost,
[
AC_DEFINE(NETINET_IF_ETHER_H_DECLARES_ETHER_NTOHOST,1,
[Define to 1 if netinet/if_ether.h declares `ether_ntohost'])
],,
[
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
])
fi
#
# After all that, is ether_ntohost() declared?
#
if test "$ac_cv_have_decl_ether_ntohost" = yes; then
#
# Yes.
#
AC_DEFINE(HAVE_DECL_ETHER_NTOHOST, 1,
[Define to 1 if you have the declaration of `ether_ntohost'])
else
#
# No, we'll have to declare it ourselves.
# Do we have "struct ether_addr" if we include
# <netinet/if_ether.h>?
#
AC_CHECK_TYPES(struct ether_addr,,,
[
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
])
fi
AC_CACHE_CHECK(for buggy ether_ntohost, ac_cv_buggy_ether_ntohost, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <netdb.h>
#if defined(NET_ETHERNET_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <net/ethernet.h>.
*/
#include <net/ethernet.h>
#elif defined(NETINET_ETHER_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <netinet/ether.h>
*/
#include <netinet/ether.h>
#elif defined(SYS_ETHERNET_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <sys/ethernet.h>
*/
#include <sys/ethernet.h>
#elif defined(ARPA_INET_H_DECLARES_ETHER_NTOHOST)
/*
* OK, just include <arpa/inet.h>
*/
#include <arpa/inet.h>
#elif defined(NETINET_IF_ETHER_H_DECLARES_ETHER_NTOHOST)
/*
* OK, include <netinet/if_ether.h>, after all the other stuff we
* need to include or define for its benefit.
*/
#define NEED_NETINET_IF_ETHER_H
#else
/*
* We'll have to declare it ourselves.
* If <netinet/if_ether.h> defines struct ether_addr, include
* it. Otherwise, define it ourselves.
*/
#ifdef HAVE_STRUCT_ETHER_ADDR
#define NEED_NETINET_IF_ETHER_H
#else /* HAVE_STRUCT_ETHER_ADDR */
struct ether_addr {
/* Beware FreeBSD calls this "octet". */
unsigned char ether_addr_octet[MAC_ADDR_LEN];
};
#endif /* HAVE_STRUCT_ETHER_ADDR */
#endif /* what declares ether_ntohost() */
#ifdef NEED_NETINET_IF_ETHER_H
/*
* Include diag-control.h before <net/if.h>, which too defines a macro
* named ND_UNREACHABLE.
*/
#include "diag-control.h"
#include <net/if.h> /* Needed on some platforms */
#include <netinet/in.h> /* Needed on some platforms */
#include <netinet/if_ether.h>
#endif /* NEED_NETINET_IF_ETHER_H */
#ifndef HAVE_DECL_ETHER_NTOHOST
/*
* No header declares it, so declare it ourselves.
*/
extern int ether_ntohost(char *, const struct ether_addr *);
#endif /* !defined(HAVE_DECL_ETHER_NTOHOST) */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
int
main(int argc, char **argv)
{
u_char ea[6] = { 0xff, 0xff, 0xff, 0xff, 0xff };
char name[MAXHOSTNAMELEN];
ether_ntohost(name, (struct ether_addr *)ea);
exit(0);
}
]])
], [ac_cv_buggy_ether_ntohost=no],
[ac_cv_buggy_ether_ntohost=yes],
[ac_cv_buggy_ether_ntohost="not while cross-compiling"])])
if test "$ac_cv_buggy_ether_ntohost" = "no"; then
AC_DEFINE(USE_ETHER_NTOHOST, 1,
[define if you have ether_ntohost() and it works])
fi
])
#
# Do we have the new open API? Check for pcap_create, and assume that,
# if we do, 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.
#
AC_CHECK_FUNC(pcap_create,,
[AC_MSG_ERROR([libpcap is too old; 1.0 or later is required])])
#
# OK, do we have pcap_set_tstamp_type? If so, assume we have
# pcap_list_tstamp_types and pcap_free_tstamp_types as well.
#
AC_CHECK_FUNCS(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.
#
AC_CHECK_FUNCS(pcap_set_tstamp_precision)
#
# Check for a miscellaneous collection of functions which we use
# if we have them.
#
AC_CHECK_FUNCS(pcap_set_immediate_mode pcap_dump_ftell64)
#
# See the comment in AC_LBL_LIBPCAP in aclocal.m4 for the reason
# why we don't check for remote-capture APIs if we're building
# with the system libpcap on macOS.
#
if test "$_dont_check_for_remote_apis" != "yes"; then
AC_CHECK_FUNCS(pcap_open pcap_findalldevs_ex)
fi
#
# Check for special debugging functions
#
AC_CHECK_FUNCS(pcap_set_parser_debug)
if test "$ac_cv_func_pcap_set_parser_debug" = "no" ; then
#
# OK, we don't have pcap_set_parser_debug() to set the libpcap
# filter expression parser debug flag; can we directly set the
# flag?
AC_MSG_CHECKING(whether pcap_debug is defined by libpcap)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[
extern int pcap_debug;
return pcap_debug;
]])
],
[ac_lbl_cv_pcap_debug_defined=yes],
[ac_lbl_cv_pcap_debug_defined=no])
if test "$ac_lbl_cv_pcap_debug_defined" = yes ; then
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_PCAP_DEBUG, 1, [define if libpcap has pcap_debug])
else
AC_MSG_RESULT(no)
#
# OK, what about "yydebug"?
#
AC_MSG_CHECKING(whether yydebug is defined by libpcap)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[
extern int yydebug;
return yydebug;
]])
],
[ac_lbl_cv_yydebug_defined=yes],
[ac_lbl_cv_yydebug_defined=no])
if test "$ac_lbl_cv_yydebug_defined" = yes ; then
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_YYDEBUG, 1, [define if libpcap has yydebug])
else
AC_MSG_RESULT(no)
fi
fi
fi
AC_CHECK_FUNCS(pcap_set_optimizer_debug)
#
# bpf_dump() moved from tcpdump to libpcap in libpcap 0.6, but some
# 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.
#
AC_REPLACE_FUNCS(bpf_dump) dnl moved to libpcap in 0.6
#
# Assume V7/BSD convention for man pages (file formats in section 5,
# miscellaneous info in section 7).
#
MAN_FILE_FORMATS=5
MAN_MISC_INFO=7
case "$host_os" in
hpux*)
#
# Use System V conventions for man pages.
#
MAN_FILE_FORMATS=4
MAN_MISC_INFO=5
;;
solaris*)
#
# Use System V conventions for man pages.
#
MAN_FILE_FORMATS=4
MAN_MISC_INFO=5
;;
esac
savedcppflags="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $V_INCLS"
#
# Check whether we have pcap/pcap-inttypes.h.
# If we do, we use that to get the C99 types defined.
#
AC_CHECK_HEADERS(pcap/pcap-inttypes.h)
CPPFLAGS="$savedcppflags"
#
# Define the old BSD specified-width types in terms of the C99 types;
# we may need them with libpcap include files.
#
AC_CHECK_TYPE([u_int8_t], ,
[AC_DEFINE([u_int8_t], [uint8_t],
[Define to `uint8_t' if u_int8_t not defined.])],
[AC_INCLUDES_DEFAULT
#include <sys/types.h>
])
AC_CHECK_TYPE([u_int16_t], ,
[AC_DEFINE([u_int16_t], [uint16_t],
[Define to `uint16_t' if u_int16_t not defined.])],
[AC_INCLUDES_DEFAULT
#include <sys/types.h>
])
AC_CHECK_TYPE([u_int32_t], ,
[AC_DEFINE([u_int32_t], [uint32_t],
[Define to `uint32_t' if u_int32_t not defined.])],
[AC_INCLUDES_DEFAULT
#include <sys/types.h>
])
AC_CHECK_TYPE([u_int64_t], ,
[AC_DEFINE([u_int64_t], [uint64_t],
[Define to `uint64_t' if u_int64_t not defined.])],
[AC_INCLUDES_DEFAULT
#include <sys/types.h>
])
AC_PROG_RANLIB
AC_CHECK_TOOL([AR], [ar])
AC_LBL_DEVEL(V_CCOPT)
# Check for OpenSSL/libressl libcrypto
AC_MSG_CHECKING(whether to use OpenSSL/libressl libcrypto)
# Specify location for both includes and libraries.
want_libcrypto=ifavailable
AC_ARG_WITH(crypto,
AS_HELP_STRING([--with-crypto]@<:@=DIR@:>@,
[use OpenSSL/libressl libcrypto (located in directory DIR, if specified) @<:@default=yes, if available@:>@]),
[
if test $withval = no
then
# User doesn't want to link with libcrypto.
want_libcrypto=no
AC_MSG_RESULT(no)
elif test $withval = yes
then
# User wants to link with libcrypto but hasn't specified
# a directory.
want_libcrypto=yes
AC_MSG_RESULT(yes)
else
# User wants to link with libcrypto and has specified
# a directory, so use the provided value.
want_libcrypto=yes
libcrypto_root=$withval
AC_MSG_RESULT([yes, using the version installed in $withval])
fi
],[
#
# Use libcrypto if it's present, otherwise don't; no directory
# was specified.
#
want_libcrypto=ifavailable
AC_MSG_RESULT([yes, if available])
])
if test "$want_libcrypto" != "no"; then
#
# Were we told where to look for libcrypto?
#
if test -z "$libcrypto_root"; then
#
# No.
#
# First, try looking for it with pkg-config, if we have it.
#
# Homebrew's pkg-config does not, by default, look for
# pkg-config files for packages it has installed.
# Furthermore, at least for OpenSSL, they appear to be
# dumped in package-specific directories whose paths are
# not only package-specific but package-version-specific.
#
# So the only way to find openssl is to get the value of
# PKG_CONFIG_PATH from "brew --env openssl" and add that
# to PKG_CONFIG_PATH. (No, we can't just assume it's under
# /usr/local; Homebrew have conveniently chosen to put it
# under /opt/homebrew on ARM.)
#
# That's the nice thing about Homebrew - it makes things easier!
# Thanks!
#
save_PKG_CONFIG_PATH="$PKG_CONFIG_PATH"
if test -n "$BREW"; then
openssl_pkgconfig_dir=`$BREW --env --plain openssl | sed -n 's/PKG_CONFIG_PATH: //p'`
PKG_CONFIG_PATH="$openssl_pkgconfig_dir:$PKG_CONFIG_PATH"
fi
PKG_CHECK_MODULE(LIBCRYPTO, libcrypto,
[
#
# We found OpenSSL/libressl libcrypto.
#
HAVE_LIBCRYPTO=yes
])
PKG_CONFIG_PATH="$save_PKG_CONFIG_PATH"
#
# If it wasn't found, and we have Homebrew installed, see
# if it's in Homebrew.
#
if test "x$HAVE_LIBCRYPTO" != "xyes" -a -n "$BREW"; then
AC_MSG_CHECKING(for openssl in Homebrew)
#
# The brew man page lies when it speaks of
# $BREW --prefix --installed <formula>
# outputting nothing. In Homebrew 3.3.16,
# it produces output regardless of whether
# the formula is installed or not, so we
# send the standard output and error to
# the bit bucket.
#
# libcrypto isn't a formula, openssl is a formula.
#
if $BREW --prefix --installed openssl >/dev/null 2>&1; then
#
# Yes. Get the include directory and library
# directory. (No, we can't just assume it's
# under /usr/local; Homebrew have conveniently
# chosen to put it under /opt/homebrew on ARM.)
#
AC_MSG_RESULT(yes)
HAVE_LIBCRYPTO=yes
openssl_path=`$BREW --prefix openssl`
LIBCRYPTO_CFLAGS="-I$openssl_path/include"
LIBCRYPTO_LIBS="-L$openssl_path/lib -lcrypto"
else
AC_MSG_RESULT(no)
fi
fi
#
# If it wasn't found, and /usr/local/include and /usr/local/lib
# exist, check if it's in /usr/local. (We check whether they
# exist because, if they don't exist, the compiler will warn
# about that and then ignore the argument, so they test
# using just the system header files and libraries.)
#
# We include the standard include file to 1) make sure that
# it's installed (if it's just a shared library for the
# benefit of existing programs, that's not useful) and 2)
# because SSL_library_init() is a library routine in some
# versions and a #defined wrapper around OPENSSL_init_ssl()
# in others.
#
if test "x$HAVE_LIBCRYPTO" != "xyes" -a -d "/usr/local/include" -a -d "/usr/local/lib"; then
AC_LBL_SAVE_CHECK_STATE
CFLAGS="$CFLAGS -I/usr/local/include"
LIBS="$LIBS -L/usr/local/lib -lcrypto"
AC_MSG_CHECKING(whether we have an OpenSSL/libressl libcrypto in /usr/local that we can use)
AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[
#include <openssl/evp.h>
]],
[[
EVP_CIPHER_CTX_block_size((EVP_CIPHER_CTX *)0);
return 0;
]])],
[
AC_MSG_RESULT(yes)
HAVE_LIBCRYPTO=yes
LIBCRYPTO_CFLAGS="-I/usr/local/include"
LIBCRYPTO_LIBS="-L/usr/local/lib -lcrypto"
],
AC_MSG_RESULT(no))
AC_LBL_RESTORE_CHECK_STATE
fi
#
# If it wasn't found, check if it's a system library.
#
# We include the standard include file to 1) make sure that
# it's installed (if it's just a shared library for the
# benefit of existing programs, that's not useful) and 2)
# make sure this isn't a newer macOS that provides libcrypto
# as a shared library but doesn't provide headers - Apple,
# bless their pointy little heads, apparently ship libcrypto
# as a library, but not the header files, in El Capitan and
# later, probably because they don't want you writing nasty
# portable code that could run on other UN*Xes, they want you
# writing code that uses their Shiny New Crypto Library and
# that thus only runs on macOS.
#
if test "x$HAVE_LIBCRYPTO" != "xyes"; then
AC_LBL_SAVE_CHECK_STATE
LIBS="$LIBS -lcrypto"
AC_MSG_CHECKING(whether we have a system OpenSSL/libressl that we can use)
AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[
#include <openssl/evp.h>
]],
[[
EVP_CIPHER_CTX_block_size((EVP_CIPHER_CTX *)0);
return 0;
]])],
[
AC_MSG_RESULT(yes)
HAVE_LIBCRYPTO=yes
LIBCRYPTO_LIBS="-lcrypto"