dnl Define ourselves
AC_INIT(tcltls, 1.8.0)

dnl Checks for programs.
#!/bin/bash -norc
dnl	This file is an input file used by the GNU "autoconf" program to
dnl	generate the file "configure", which is run during Tcl installation
dnl	to configure the system for the local environment.
AC_PROG_CC
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AC_GNU_SOURCE

dnl Determine system information
DC_CHK_OS_INFO

#
dnl Look for appropriate headers
AC_CHECK_HEADERS(unistd.h stdlib.h string.h strings.h)
#-----------------------------------------------------------------------
# This is the configure.ac for the TclTLS extension.  The only places you
# should need to modify this file are marked by the string __CHANGE__.
#-----------------------------------------------------------------------

#-----------------------------------------------------------------------
dnl Perform Tcl Extension required stuff
# Set your package name and version numbers here.
TCLEXT_INIT

if test "$TCLEXT_BUILD" != 'static'; then
#
# This initializes the environment with PACKAGE_NAME and PACKAGE_VERSION
# set as provided.  These will also be added as -D defs in your Makefile
# so you can encode the package version directly into the source files.
# This will also define a special symbol for Windows (BUILD_<PACKAGE_NAME>
# so that we create the export library with the dll.
	dnl Determine how to make shared objects
	DC_GET_SHOBJFLAGS
#-----------------------------------------------------------------------

	EXTENSION_TARGET="tcltls.${SHOBJEXT}"
else
AC_INIT([tls],[1.8.0])
	AC_CHECK_TOOL([AR], [ar], [false])
	AC_CHECK_TOOL([RANLIB], [ranlib], [:])
	EXTENSION_TARGET="tcltls.${AREXT}"
fi
AC_SUBST(EXTENSION_TARGET)
AC_SUBST(TCLEXT_BUILD)

dnl Determine what SSL library to link with
AC_ARG_WITH([ssl], AS_HELP_STRING([--with-ssl=<name>], [name of ssl library to build against (openssl, libressl, nss, auto)]), [
	if test "$withval" = "no"; then
#--------------------------------------------------------------------
# Call TEA_INIT as the first TEA_ macro to set up initial vars.
# This will define a ${TEA_PLATFORM} variable == "unix" or "windows"
# as well as PKG_LIB_FILE and PKG_STUB_LIB_FILE.
#--------------------------------------------------------------------

TEA_INIT

		AC_MSG_ERROR([You may not specify --without-ssl])
	fi
AC_CONFIG_AUX_DIR(tclconfig)

	if test "$withval" = "yes"; then
		AC_MSG_ERROR([If you specify --with-ssl then you must provide a value])
	fi
#--------------------------------------------------------------------
# Load the tclConfig.sh file
#--------------------------------------------------------------------

	tcltls_ssl_lib="$withval"
], [
TEA_PATH_TCLCONFIG
TEA_LOAD_TCLCONFIG

	tcltls_ssl_lib='auto'
])
#--------------------------------------------------------------------
# Load the tkConfig.sh file if necessary (Tk extension)
#--------------------------------------------------------------------

dnl Enable support for building the same library every time
tcltls_deterministic='false'
AC_ARG_ENABLE([deterministic], AS_HELP_STRING([--enable-deterministic], [enable deterministic parameters]), [
	if test "$enableval" = "yes"; then
		tcltls_deterministic='true'
	fi
])
if test "$tcltls_deterministic" = 'true'; then
	GEN_DH_PARAMS_ARGS='fallback'
else
	GEN_DH_PARAMS_ARGS=''
#TEA_PATH_TKCONFIG
fi
#TEA_LOAD_TKCONFIG

dnl Enable support for specifying pre-computed DH params size
AC_ARG_WITH([builtin-dh-params-size], AS_HELP_STRING([--with-builtin-dh-params-size=<bits>], [specify the size of the built-in, precomputed, DH params]), [
	AS_CASE([$withval],
		[2048|4096|8192],,
		[
#-----------------------------------------------------------------------
# Handle the --prefix=... option by defaulting to what Tcl gave.
# Must be called after TEA_LOAD_TCLCONFIG and before TEA_SETUP_COMPILER.
#-----------------------------------------------------------------------

TEA_PREFIX
			AC_MSG_ERROR([Unsupported DH params size: $withval])
		]
	)

#-----------------------------------------------------------------------
# Standard compiler checks.
# This sets up CC by using the CC env var, or looks for gcc otherwise.
# This also calls AC_PROG_CC and a few others to create the basic setup
# necessary to compile executables.
#-----------------------------------------------------------------------

	GEN_DH_PARAMS_ARGS="${GEN_DH_PARAMS_ARGS} bits=$withval"
])
AC_SUBST(GEN_DH_PARAMS_ARGS)
TEA_SETUP_COMPILER

dnl Allow the user to manually disable protocols
dnl ## SSLv2: Enabled by default
tcltls_ssl_ssl2='true'
AC_ARG_ENABLE([sslv2], AS_HELP_STRING([--disable-sslv2], [disable SSLv2 protocol]), [
	if test "$enableval" = "yes"; then
		tcltls_ssl_ssl2='force'
	else
		tcltls_ssl_ssl2='false'
	fi
])
#-----------------------------------------------------------------------
# __CHANGE__
# Specify the C source files to compile in TEA_ADD_SOURCES,
# public headers that need to be installed in TEA_ADD_HEADERS,
# stub library C source files to compile in TEA_ADD_STUB_SOURCES,
# and runtime Tcl library files in TEA_ADD_TCL_SOURCES.
# This defines PKG(_STUB)_SOURCES, PKG(_STUB)_OBJECTS, PKG_HEADERS
# and PKG_TCL_SOURCES.
#-----------------------------------------------------------------------

dnl ## SSLv3: Enabled by default
tcltls_ssl_ssl3='true'
TEA_ADD_SOURCES([tls.c tlsBIO.c tlsIO.c tlsX509.c])
TEA_ADD_HEADERS([generic/tls.h])
AC_ARG_ENABLE([sslv3], AS_HELP_STRING([--disable-sslv3], [disable SSLv3 protocol]), [
	if test "$enableval" = "yes"; then
		tcltls_ssl_ssl3='force'
TEA_ADD_INCLUDES([])
	else
		tcltls_ssl_ssl3='false'
	fi
])

TEA_ADD_LIBS([])
TEA_ADD_CFLAGS([])
dnl ## TLSv1.0: Enabled by default
tcltls_ssl_tls1_0='true'
TEA_ADD_STUB_SOURCES([])
TEA_ADD_TCL_SOURCES([library/tls.tcl])
AC_ARG_ENABLE([tlsv1.0], AS_HELP_STRING([--disable-tlsv1.0], [disable TLSv1.0 protocol]), [
	if test "$enableval" = "yes"; then
		tcltls_ssl_tls1_0='force'

	else
		tcltls_ssl_tls1_0='false'
	fi
])

#--------------------------------------------------------------------
#
dnl ## TLSv1.1: Enabled by default
tcltls_ssl_tls1_1='true'
AC_ARG_ENABLE([tlsv1.1], AS_HELP_STRING([--disable-tlsv1.1], [disable TLSv1.1 protocol]), [
	if test "$enableval" = "yes"; then
		tcltls_ssl_tls1_1='force'
	else
		tcltls_ssl_tls1_1='false'
	fi
# You can add more files to clean if your extension creates any extra
# files by extending CLEANFILES.
])

dnl ## TLSv1.2: Enabled by default
# Add pkgIndex.tcl if it is generated in the Makefile instead of ./configure
# and change Makefile.in to move it from CONFIG_CLEAN_FILES to BINARIES var.
#
# A few miscellaneous platform-specific items:
# TEA_ADD_* any platform specific compiler/build info here.
#--------------------------------------------------------------------

tcltls_ssl_tls1_2='true'
AC_ARG_ENABLE([tlsv1.2], AS_HELP_STRING([--disable-tlsv1.2], [disable TLSv1.2 protocol]), [
	if test "$enableval" = "yes"; then
		tcltls_ssl_tls1_2='force'
	else
		tcltls_ssl_tls1_2='false'
	fi
CONFIG_CLEAN_FILES="$CONFIG_CLEAN_FILES tls.tcl.h.* config.log config.status dh_params.h.new dh_params.h Makefile pkgIndex.tcl tcltls.a.linkadd tcltls.syms"
if test "${TEA_PLATFORM}" = "windows" ; then
    AC_DEFINE(BUILD_tls)
    AC_DEFINE(WINDOWS)
    CLEANFILES="pkgIndex.tcl *.lib *.dll *.exp *.ilk *.pdb vc*.pch"
else
    CLEANFILES="pkgIndex.tcl *.so"
fi
])
AC_SUBST(CLEANFILES)

#--------------------------------------------------------------------
# Choose which headers you need.  Extension authors should try very
# hard to only rely on the Tcl public header files.  Internal headers
# contain private data structures and are subject to change without
dnl ## TLSv1.3: Enabled by default
tcltls_ssl_tls1_3='true'
AC_ARG_ENABLE([tlsv1.3], AS_HELP_STRING([--disable-tlsv1.3], [disable TLSv1.3 protocol]), [
	if test "$enableval" = "yes"; then
		tcltls_ssl_tls1_3='force'
# notice.
# This MUST be called after TEA_LOAD_TCLCONFIG / TEA_LOAD_TKCONFIG
#--------------------------------------------------------------------

TEA_PUBLIC_TCL_HEADERS
	else
#TEA_PRIVATE_TCL_HEADERS
		tcltls_ssl_tls1_3='false'
	fi
])

#TEA_PUBLIC_TK_HEADERS
#TEA_PRIVATE_TK_HEADERS
#TEA_PATH_X

dnl Enable support for a debugging build
tcltls_debug='false'
AC_ARG_ENABLE([debug], AS_HELP_STRING([--enable-debug], [enable debugging parameters]), [
	if test "$enableval" = "yes"; then
		tcltls_debug='true'
	fi
#--------------------------------------------------------------------
# Check whether --enable-threads or --disable-threads was given.
# This auto-enables if Tcl was compiled threaded.
#--------------------------------------------------------------------

TEA_ENABLE_THREADS

])
if test "$tcltls_debug" = 'true'; then
	AC_DEFINE(TCLEXT_TCLTLS_DEBUG, [1], [Enable debugging build])
	AX_CHECK_COMPILE_FLAG([-fcheck-pointer-bounds], [CFLAGS="$CFLAGS -fcheck-pointer-bounds"])
#--------------------------------------------------------------------
# The statement below defines a collection of symbols related to
# building as a shared library instead of a static library.
#--------------------------------------------------------------------

else
	dnl If we are not doing debugging disable some of the more annoying warnings
	AX_CHECK_COMPILE_FLAG([-Wno-unused-value], [CFLAGS="$CFLAGS -Wno-unused-value"])
TEA_ENABLE_SHARED
	AX_CHECK_COMPILE_FLAG([-Wno-unused-parameter], [CFLAGS="$CFLAGS -Wno-unused-parameter"])
	AX_CHECK_COMPILE_FLAG([-Wno-deprecated-declarations], [CFLAGS="$CFLAGS -Wno-deprecated-declarations"])
fi

#--------------------------------------------------------------------
# This macro figures out what flags to use with the compiler/linker
# when building shared/static debug/optimized objects.  This information
dnl Find "pkg-config" since we need to use it
AC_CHECK_TOOL([PKGCONFIG], [pkg-config], [false])
# can be taken from the tclConfig.sh file, but this figures it all out.
#--------------------------------------------------------------------

dnl Determine if we have been asked to use a fast path if possible
tcltls_ssl_fastpath='no'
AC_ARG_ENABLE([ssl-fastpath], AS_HELP_STRING([--enable-ssl-fastpath], [enable using the underlying file descriptor for talking directly to the SSL library]), [
	if test "$enableval" = 'yes'; then
		tcltls_ssl_fastpath='yes'
	else
		tcltls_ssl_fastpath='no'
TEA_CONFIG_CFLAGS
	fi
])

if test "$tcltls_ssl_fastpath" = 'yes'; then
	AC_DEFINE(TCLTLS_SSL_USE_FASTPATH, [1], [Define this to enable using the underlying file descriptor for talking directly to the SSL library])
fi
#--------------------------------------------------------------------
# Set the default compiler switches based on the --enable-symbols option.
#--------------------------------------------------------------------

dnl Determine if we have been asked to statically link to the SSL library
TCLEXT_TLS_STATIC_SSL='no'
AC_ARG_ENABLE([static-ssl], AS_HELP_STRING([--enable-static-ssl], [enable statically linking to the specified SSL library]), [
	if test "$enableval" = 'yes'; then
		TCLEXT_TLS_STATIC_SSL='yes'
TEA_ENABLE_SYMBOLS

#--------------------------------------------------------------------
# Everyone should be linking against the Tcl stub library.  If you
# can't for some reason, remove this definition.  If you aren't using
# stubs, you also need to modify the SHLIB_LD_LIBS setting below to
# link against the non-stubbed Tcl library.  Add Tk too if necessary.
	fi
])
#--------------------------------------------------------------------

AC_DEFINE(USE_TCL_STUBS)
dnl Enable compiler warnings
AX_CHECK_COMPILE_FLAG([-Wall], [CFLAGS="$CFLAGS -Wall"])
AX_CHECK_COMPILE_FLAG([-W], [
	CFLAGS="$CFLAGS -W"
	AX_CHECK_COMPILE_FLAG([-Wno-self-assign], [CFLAGS="$CFLAGS -Wno-self-assign"])
#AC_DEFINE(USE_TK_STUBS)

#--------------------------------------------------------------------
# This macro generates a line to use when building a library.  It
# depends on values set by the TEA_ENABLE_SHARED, TEA_ENABLE_SYMBOLS,
])
# and TEA_LOAD_TCLCONFIG macros above.
#--------------------------------------------------------------------

dnl Enable hardening
tcltls_enable_hardening='auto'
AC_ARG_ENABLE([hardening], AS_HELP_STRING([--disable-hardening], [disable hardening attempts]), [
TEA_MAKE_LIB

	tcltls_enable_hardening="$enableval"
])
if test "$tcltls_enable_hardening" = 'auto'; then
	tcltls_enable_hardening='true'
	if test "$TCLEXT_BUILD" = 'static'; then
		tcltls_enable_hardening='false'
	fi
#--------------------------------------------------------------------
# This marco includes the TCL TLS specific functions to set the
# OpenSSL or LibreSSL config.
#--------------------------------------------------------------------
elif test "$tcltls_enable_hardening" = 'yes'; then
	tcltls_enable_hardening='true'
else
	tcltls_enable_hardening='false'
fi
if test "$tcltls_enable_hardening" = 'true'; then
	AX_CHECK_COMPILE_FLAG([-fstack-protector-all], [CFLAGS="$CFLAGS -fstack-protector-all"])
	AX_CHECK_COMPILE_FLAG([-fno-strict-overflow], [CFLAGS="$CFLAGS -fno-strict-overflow"])
	AC_DEFINE([_FORTIFY_SOURCE], [2], [Enable fortification])
fi

dnl XXX:TODO: Automatically determine the SSL library to use
dnl           defaulting to OpenSSL for compatibility reasons
if test "$tcltls_ssl_lib" = 'auto'; then
	tcltls_ssl_lib='openssl'
fi
TCLTLS_SSL_OPENSSL

#--------------------------------------------------------------------
# Shared libraries and static libraries have different names.
# Also, windows libraries and unix libraries have different names.
AC_MSG_CHECKING([which TLS library to use])
# For the OpenSSL version, I chose to use the same library names that
AC_MSG_RESULT([$tcltls_ssl_lib])
# OpenSSL uses as its default names.
#--------------------------------------------------------------------

dnl Manually rewrite libressl to OpenSSL since we use the
dnl compatibility interface
if test "$tcltls_ssl_lib" = "libressl"; then
if test "${TEA_PLATFORM}" = "windows" ; then
    if test "$GCC" = "yes"; then
	tcltls_ssl_lib='openssl'
fi

	TEA_ADD_CFLAGS([${TCLTLS_SSL_CFLAGS}])
	TEA_ADD_INCLUDES([${TCLTLS_SSL_CPPFLAGS}])
	TEA_ADD_LIBS([${TCLTLS_SSL_LIBS}])
    fi
else
AS_CASE([$tcltls_ssl_lib],
	[openssl], [
		TCLTLS_SSL_OPENSSL
	],
	[nss], [
	 	TCLTLS_SSL_LIBS=""
		TCLTLS_SSL_CFLAGS=""
		TCLTLS_SSL_CPPFLAGS=""
	],
	[
		AC_MSG_ERROR([Unsupported SSL library: $tcltls_ssl_lib])
	]
)
	TEA_ADD_CFLAGS([${TCLTLS_SSL_CFLAGS}])
	TEA_ADD_INCLUDES([${TCLTLS_SSL_CPPFLAGS}])
	TEA_ADD_LIBS([${TCLTLS_SSL_LIBS}])
fi

#--------------------------------------------------------------------
# Determine the name of the tclsh and/or wish executables in the
# Tcl and Tk build directories or the location they were installed
# into. These paths are used to support running test cases only,
# the Makefile should not be making use of these paths to generate
# a pkgIndex.tcl file or anything else at extension build time.
#--------------------------------------------------------------------

TEA_PROG_TCLSH
#TEA_PROG_WISH

dnl Determine how to use this SSL library
AC_MSG_CHECKING([how to use $tcltls_ssl_lib])
LIBS="${TCLTLS_SSL_LIBS} ${LIBS} ${TCLTLS_SSL_LIBS}"
CFLAGS="${TCLTLS_SSL_CFLAGS} ${CFLAGS} ${TCLTLS_SSL_CFLAGS}"
CPPFLAGS="${TCLTLS_SSL_CPPFLAGS} ${CPPFLAGS} ${TCLTLS_SSL_CPPFLAGS}"
AC_MSG_RESULT([$TCLTLS_SSL_CPPFLAGS $TCLTLS_SSL_CFLAGS $TCLTLS_SSL_LIBS])
#--------------------------------------------------------------------
# Setup a *Config.sh.in configuration file.
#--------------------------------------------------------------------

dnl Sync the RPATH if requested
if test "$TCLEXT_BUILD" != 'static'; then
	if test "$TCLEXT_TLS_STATIC_SSL" = 'yes'; then
		DC_SYNC_RPATH([no])
	else
		DC_SYNC_RPATH([yes])
	fi
#TEA_EXPORT_CONFIG([tls])
#AC_SUBST(SAMPLE_VAR)

fi

#--------------------------------------------------------------------
# Specify files to substitute AC variables in. You may alternatively
dnl Enable a stable ABI
DC_SETUP_STABLE_API([${srcdir}/tcltls.vers], tcltls.syms)
if test "$tcltls_debug" = 'true'; then
	WEAKENSYMS=':'
# have a special pkgIndex.tcl.in or other files which require
# substituting the AC variables in. Include these here.
#--------------------------------------------------------------------

AC_CONFIG_FILES([Makefile pkgIndex.tcl])
#AC_CONFIG_FILES([tlsConfig.sh])

	REMOVESYMS=':'
fi
#--------------------------------------------------------------------
# Finally, substitute all of the various values into the files
# specified with AC_CONFIG_FILES.
#--------------------------------------------------------------------

dnl Produce output
AC_OUTPUT(Makefile pkgIndex.tcl tcltls.syms)
AC_OUTPUT