adam@0: # ===========================================================================
adam@0: #     http://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
adam@0: # ===========================================================================
adam@0: #
adam@0: # SYNOPSIS
adam@0: #
adam@0: #   AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
adam@0: #
adam@0: # DESCRIPTION
adam@0: #
adam@0: #   Look for OpenSSL in a number of default spots, or in a user-selected
adam@0: #   spot (via --with-openssl).  Sets
adam@0: #
adam@0: #     OPENSSL_INCLUDES to the include directives required
adam@0: #     OPENSSL_LIBS to the -l directives required
adam@0: #     OPENSSL_LDFLAGS to the -L or -R flags required
adam@0: #
adam@0: #   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
adam@0: #
adam@0: #   This macro sets OPENSSL_INCLUDES such that source files should use the
adam@0: #   openssl/ directory in include directives:
adam@0: #
adam@0: #     #include <openssl/hmac.h>
adam@0: #
adam@0: # LICENSE
adam@0: #
adam@0: #   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
adam@0: #   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
adam@0: #
adam@0: #   Copying and distribution of this file, with or without modification, are
adam@0: #   permitted in any medium without royalty provided the copyright notice
adam@0: #   and this notice are preserved. This file is offered as-is, without any
adam@0: #   warranty.
adam@0: 
adam@0: #serial 7
adam@0: 
adam@0: AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
adam@0: AC_DEFUN([AX_CHECK_OPENSSL], [
adam@0:     found=false
adam@0:     AC_ARG_WITH(openssl,
adam@0:         AS_HELP_STRING([--with-openssl=DIR],
adam@0:             [root of the OpenSSL directory]),
adam@0:         [
adam@0:             case "$withval" in
adam@0:             "" | y | ye | yes | n | no)
adam@0:             AC_MSG_ERROR([Invalid --with-openssl value])
adam@0:               ;;
adam@0:             *) ssldirs="$withval"
adam@0:               ;;
adam@0:             esac
adam@0:         ], [
adam@0:             # if pkg-config is installed and openssl has installed a .pc file,
adam@0:             # then use that information and don't search ssldirs
adam@0:             AC_PATH_PROG(PKG_CONFIG, pkg-config)
adam@0:             if test x"$PKG_CONFIG" != x""; then
adam@0:                 OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
adam@0:                 if test $? = 0; then
adam@0:                     OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
adam@0:                     OPENSSL_INCLUDES=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
adam@0:                     found=true
adam@0:                 fi
adam@0:             fi
adam@0: 
adam@0:             # no such luck; use some default ssldirs
adam@0:             if ! $found; then
adam@0:                 ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
adam@0:             fi
adam@0:         ]
adam@0:         )
adam@0: 
adam@0: 
adam@0:     # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
adam@0:     # an 'openssl' subdirectory
adam@0: 
adam@0:     if ! $found; then
adam@0:         OPENSSL_INCLUDES=
adam@0:         for ssldir in $ssldirs; do
adam@0:             AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
adam@0:             if test -f "$ssldir/include/openssl/ssl.h"; then
adam@0:                 OPENSSL_INCLUDES="-I$ssldir/include"
adam@0:                 OPENSSL_LDFLAGS="-L$ssldir/lib"
adam@0:                 OPENSSL_LIBS="-lssl -lcrypto"
adam@0:                 found=true
adam@0:                 AC_MSG_RESULT([yes])
adam@0:                 break
adam@0:             else
adam@0:                 AC_MSG_RESULT([no])
adam@0:             fi
adam@0:         done
adam@0: 
adam@0:         # if the file wasn't found, well, go ahead and try the link anyway -- maybe
adam@0:         # it will just work!
adam@0:     fi
adam@0: 
adam@0:     # try the preprocessor and linker with our new flags,
adam@0:     # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
adam@0: 
adam@0:     AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
adam@0:     echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
adam@0:         "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_INCLUDES=$OPENSSL_INCLUDES" >&AS_MESSAGE_LOG_FD
adam@0: 
adam@0:     save_LIBS="$LIBS"
adam@0:     save_LDFLAGS="$LDFLAGS"
adam@0:     save_CPPFLAGS="$CPPFLAGS"
adam@0:     LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
adam@0:     LIBS="$OPENSSL_LIBS $LIBS"
adam@0:     CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
adam@0:     AC_LINK_IFELSE(
adam@0:         AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)]),
adam@0:         [
adam@0:             AC_MSG_RESULT([yes])
adam@0:             $1
adam@0:         ], [
adam@0:             AC_MSG_RESULT([no])
adam@0:             $2
adam@0:         ])
adam@0:     CPPFLAGS="$save_CPPFLAGS"
adam@0:     LDFLAGS="$save_LDFLAGS"
adam@0:     LIBS="$save_LIBS"
adam@0: 
adam@0:     AC_SUBST([OPENSSL_INCLUDES])
adam@0:     AC_SUBST([OPENSSL_LIBS])
adam@0:     AC_SUBST([OPENSSL_LDFLAGS])
adam@0: ])