#***************************************************************************
#                                  _   _ ____  _
#  Project                     ___| | | |  _ \| |
#                             / __| | | | |_) | |
#                            | (__| |_| |  _ <| |___
#                             \___|\___/|_| \_\_____|
#
# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://curl.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
# SPDX-License-Identifier: curl
#
#***************************************************************************

AC_DEFUN([CURL_WITH_WOLFSSL], [
dnl ----------------------------------------------------
dnl check for wolfSSL
dnl ----------------------------------------------------

case "$OPT_WOLFSSL" in
  yes|no)
    wolfpkg=""
    ;;
  *)
    wolfpkg="$withval/lib/pkgconfig"
    ;;
esac

if test "$OPT_WOLFSSL" != "no"; then
  _cppflags=$CPPFLAGS
  _ldflags=$LDFLAGS
  _ldflagspc=$LDFLAGSPC

  ssl_msg=

  if test "$OPT_WOLFSSL" != "no"; then

    if test "$OPT_WOLFSSL" = "yes"; then
      OPT_WOLFSSL=""
    fi

    dnl try pkg-config magic
    CURL_CHECK_PKGCONFIG(wolfssl, [$wolfpkg])
    AC_MSG_NOTICE([Check directory $wolfpkg])

    addld=""
    addlib=""
    addcflags=""
    if test "$PKGCONFIG" != "no"; then
      addlib=`CURL_EXPORT_PCDIR([$wolfpkg])
        $PKGCONFIG --libs-only-l wolfssl`
      addld=`CURL_EXPORT_PCDIR([$wolfpkg])
        $PKGCONFIG --libs-only-L wolfssl`
      addcflags=`CURL_EXPORT_PCDIR([$wolfpkg])
        $PKGCONFIG --cflags-only-I wolfssl`
      version=`CURL_EXPORT_PCDIR([$wolfpkg])
        $PKGCONFIG --modversion wolfssl`
      wolfssllibpath=`echo $addld | $SED -e 's/^-L//'`
    else
      addlib=-lwolfssl
      dnl use system defaults if user does not supply a path
      if test -n "$OPT_WOLFSSL"; then
        addld=-L$OPT_WOLFSSL/lib$libsuff
        addcflags=-I$OPT_WOLFSSL/include
        wolfssllibpath=$OPT_WOLFSSL/lib$libsuff
      fi
    fi

    if test "$curl_cv_apple" = "yes"; then
      addlib="$addlib -framework Security -framework CoreFoundation"
    else
      addlib="$addlib -lm"
    fi

    if test "$USE_WOLFSSL" != "yes"; then
      CPPFLAGS="$CPPFLAGS -DWOLFSSL_OPTIONS_IGNORE_SYS"

      LDFLAGS="$LDFLAGS $addld"
      LDFLAGSPC="$LDFLAGSPC $addld"
      AC_MSG_NOTICE([Add $addld to LDFLAGS])
      if test "$addcflags" != "-I/usr/include"; then
        CPPFLAGS="$CPPFLAGS $addcflags"
        AC_MSG_NOTICE([Add $addcflags to CPPFLAGS])
      fi

      my_ac_save_LIBS="$LIBS"
      LIBS="$addlib $LIBS"
      AC_MSG_NOTICE([Add $addlib to LIBS])

      AC_MSG_CHECKING([for wolfSSL_Init in -lwolfssl])
      AC_LINK_IFELSE([
        AC_LANG_PROGRAM([[
          #include <wolfssl/options.h>
          #include <wolfssl/ssl.h>
        ]],[[
          return wolfSSL_Init();
        ]])
      ],[
        AC_MSG_RESULT(yes)
        AC_DEFINE(USE_WOLFSSL, 1, [if wolfSSL is enabled])
        WOLFSSL_ENABLED=1
        USE_WOLFSSL="yes"
        ssl_msg="wolfSSL"
        test "wolfssl" != "$DEFAULT_SSL_BACKEND" || VALID_DEFAULT_SSL_BACKEND=yes
      ],
      [
        AC_MSG_RESULT(no)
        CPPFLAGS=$_cppflags
        LDFLAGS=$_ldflags
        LDFLAGSPC=$_ldflagspc
        wolfssllibpath=""
      ])
      LIBS="$my_ac_save_LIBS"
    fi

    if test "$USE_WOLFSSL" = "yes"; then
      AC_MSG_NOTICE([detected wolfSSL])
      check_for_ca_bundle=1

      LIBS="$addlib $LIBS"

      dnl is this wolfSSL providing the original QUIC API?
      AC_CHECK_FUNCS([wolfSSL_set_quic_use_legacy_codepoint], [QUIC_ENABLED=yes])

      dnl wolfSSL needs configure --enable-opensslextra to have *get_peer*
      dnl DES* is needed for NTLM support and lives in the OpenSSL compatibility
      dnl layer
      dnl if wolfSSL_BIO_set_shutdown is present, we have the full BIO feature set
      AC_CHECK_FUNCS(wolfSSL_get_peer_certificate \
                     wolfSSL_UseALPN \
                     wolfSSL_DES_ecb_encrypt \
                     wolfSSL_BIO_new \
                     wolfSSL_BIO_set_shutdown)

      dnl if this symbol is present, we want the include path to include the
      dnl OpenSSL API root as well
      if test "$ac_cv_func_wolfSSL_DES_ecb_encrypt" = "yes"; then
        HAVE_WOLFSSL_DES_ECB_ENCRYPT=1
      fi

      dnl if this symbol is present, we can make use of BIO filter chains
      if test "$ac_cv_func_wolfSSL_BIO_new" = "yes"; then
        HAVE_WOLFSSL_BIO_NEW=1
      fi

      if test -n "$wolfssllibpath"; then
        dnl when shared libs were found in a path that the runtime
        dnl linker does not search through, we need to add it to
        dnl CURL_LIBRARY_PATH to prevent further configure tests to fail
        dnl due to this
        if test "$cross_compiling" != "yes"; then
          CURL_LIBRARY_PATH="$CURL_LIBRARY_PATH:$wolfssllibpath"
          export CURL_LIBRARY_PATH
          AC_MSG_NOTICE([Added $wolfssllibpath to CURL_LIBRARY_PATH])
        fi
      fi
      LIBCURL_PC_REQUIRES_PRIVATE="$LIBCURL_PC_REQUIRES_PRIVATE wolfssl"
    else
      AC_MSG_ERROR([--with-wolfssl but wolfSSL was not found or does not work])
    fi

  fi dnl wolfSSL not disabled

  test -z "$ssl_msg" || ssl_backends="${ssl_backends:+$ssl_backends, }$ssl_msg"
fi

])
