m4/ax_lib_openssl.m4

   1 # ===========================================================================
   2 #             ax_lib_openssl.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_LIB_OPENSSL([MINIMUM-VERSION])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   This macro provides tests of availability of OpenSSL of
  12 #   particular version or newer. This macros checks for OpenSSL
  13 #   headers and libraries and defines compilation flags
  14 #
  15 #   Macro supports following options and their values:
  16 #
  17 #   1) Single-option usage:
  18 #
  19 #     --with-openssl - yes, no or path to OpenSSL installation prefix
  20 #
  21 #   This macro calls:
  22 #
  23 #     AC_SUBST(OPENSSL_CFLAGS)
  24 #     AC_SUBST(OPENSSL_LDFLAGS)
  25 #     AC_SUBST(OPENSSL_VERSION) - only if version requirement is used
  26 #
  27 #   And sets:
  28 #
  29 #     HAVE_OPENSSL
  30 #
  31 # LAST MODIFICATION
  32 #
  33 #   2008-04-12
  34 #
  35 # COPYLEFT
  36 #
  37 #   Copyright (c) 2008 Mateusz Loskot <mateusz@loskot.net>
  38 #
  39 #   Copying and distribution of this file, with or without modification, are
  40 #   permitted in any medium without royalty provided the copyright notice
  41 #   and this notice are preserved.
  42
  43 AC_DEFUN([AX_LIB_OPENSSL],
  44 [
  45     AC_ARG_WITH([openssl],
  46         AC_HELP_STRING([--with-openssl=@<:@ARG@:>@],
  47             [use OpenSSL from given prefix (ARG=path); check standard prefixes (ARG=yes); disable (ARG=no)]
  48         ),
  49         [
  50         if test "$withval" = "yes"; then
  51             if test -d /var/local/ssl/include ; then
  52                 openssl_prefix=/var/local/ssl
  53             elif test -d /usr/local/ssl/include ; then
  54                 openssl_prefix=/usr/local/ssl
  55             elif test -d /usr/lib/ssl/include ; then
  56                 openssl_prefix=/usr/lib/ssl
  57             elif test -d /usr/include/openssl ; then
  58                 openssl_prefix=/usr
  59             else
  60                 openssl_prefix=""
  61             fi
  62             openssl_requested="yes"
  63         elif test -d "$withval"; then
  64             openssl_prefix="$withval"
  65             openssl_requested="yes"
  66         else
  67             openssl_prefix=""
  68             openssl_requested="no"
  69         fi
  70         ],
  71         [
  72         dnl Default behavior is implicit yes
  73         if test -d /var/local/ssl/include ; then
  74             openssl_prefix=/var/local/ssl
  75         elif test -d /usr/local/ssl/include ; then
  76             openssl_prefix=/usr/local/ssl
  77         elif test -d /usr/lib/ssl/include ; then
  78             openssl_prefix=/usr/lib/ssl
  79         elif test -d /usr/include/openssl ; then
  80             openssl_prefix=/usr
  81         else
  82             openssl_prefix=""
  83         fi
  84         ]
  85     )
  86
  87     OPENSSL_CPPFLAGS=""
  88     OPENSSL_LDFLAGS=""
  89     OPENSSL_VERSION=""
  90
  91     dnl
  92     dnl Collect include/lib paths and flags
  93     dnl
  94     run_openssl_test="no"
  95
  96     if test -n "$openssl_prefix"; then
  97         openssl_include_dir="$openssl_prefix/include"
  98         openssl_ldflags="-L$openssl_prefix/lib"
  99         run_openssl_test="yes"
 100     elif test "$openssl_requested" = "yes"; then
 101         if test -n "$openssl_include_dir" -a -n "$openssl_lib_flags"; then
 102             run_openssl_test="yes"
 103         fi
 104     else
 105         run_openssl_test="no"
 106     fi
 107
 108     openssl_libs="-lssl -lcrypto"
 109
 110     dnl
 111     dnl Check OpenSSL files
 112     dnl
 113     if test "$run_openssl_test" = "yes"; then
 114
 115         saved_CPPFLAGS="$CPPFLAGS"
 116         CPPFLAGS="$CPPFLAGS -I$openssl_include_dir"
 117
 118         saved_LDFLAGS="$LDFLAGS"
 119         LDFLAGS="$LDFLAGS $openssl_ldflags"
 120
 121         saved_LIBS="$LIBS"
 122         LIBS="$openssl_libs $LIBS"
 123
 124         dnl
 125         dnl Check OpenSSL headers
 126         dnl
 127         AC_MSG_CHECKING([for OpenSSL headers in $openssl_include_dir])
 128
 129         AC_LANG_PUSH([C])
 130         AC_COMPILE_IFELSE([
 131             AC_LANG_PROGRAM(
 132                 [[
 133 @%:@include <openssl/opensslv.h>
 134 @%:@include <openssl/ssl.h>
 135 @%:@include <openssl/crypto.h>
 136                 ]],
 137                 [[]]
 138             )],
 139             [
 140             OPENSSL_CPPFLAGS="-I$openssl_include_dir"
 141             openssl_header_found="yes"
 142             AC_MSG_RESULT([found])
 143             ],
 144             [
 145             openssl_header_found="no"
 146             AC_MSG_RESULT([not found])
 147             ]
 148         )
 149         AC_LANG_POP([C])
 150
 151         dnl
 152         dnl Check OpenSSL libraries
 153         dnl
 154         if test "$openssl_header_found" = "yes"; then
 155
 156             AC_MSG_CHECKING([for OpenSSL libraries])
 157
 158             AC_LANG_PUSH([C])
 159             AC_LINK_IFELSE([
 160                 AC_LANG_PROGRAM(
 161                     [[
 162 @%:@include <openssl/opensslv.h>
 163 @%:@include <openssl/ssl.h>
 164 @%:@include <openssl/crypto.h>
 165 #if (OPENSSL_VERSION_NUMBER < 0x0090700f)
 166 #endif
 167                     ]],
 168                     [[
 169 SSL_library_init();
 170 SSLeay();
 171                     ]]
 172                 )],
 173                 [
 174                 OPENSSL_LDFLAGS="$openssl_ldflags"
 175                 OPENSSL_LIBS="$openssl_libs"
 176                 openssl_lib_found="yes"
 177                 AC_MSG_RESULT([found])
 178                 ],
 179                 [
 180                 openssl_lib_found="no"
 181                 AC_MSG_RESULT([not found])
 182                 ]
 183             )
 184             AC_LANG_POP([C])
 185         fi
 186
 187         CPPFLAGS="$saved_CPPFLAGS"
 188         LDFLAGS="$saved_LDFLAGS"
 189         LIBS="$saved_LIBS"
 190     fi
 191
 192     AC_MSG_CHECKING([for OpenSSL])
 193
 194     if test "$run_openssl_test" = "yes"; then
 195         if test "$openssl_header_found" = "yes" -a "$openssl_lib_found" = "yes"; then
 196
 197             AC_SUBST([OPENSSL_CPPFLAGS])
 198             AC_SUBST([OPENSSL_LDFLAGS])
 199             AC_SUBST([OPENSSL_LIBS])
 200
 201             HAVE_OPENSSL="yes"
 202         else
 203             HAVE_OPENSSL="no"
 204         fi
 205
 206         AC_MSG_RESULT([$HAVE_OPENSSL])
 207
 208         dnl
 209         dnl Check OpenSSL version
 210         dnl
 211         if test "$HAVE_OPENSSL" = "yes"; then
 212
 213             openssl_version_req=ifelse([$1], [], [], [$1])
 214
 215             if test  -n "$openssl_version_req"; then
 216
 217                 AC_MSG_CHECKING([if OpenSSL version is >= $openssl_version_req])
 218
 219                 if test -f "$openssl_include_dir/openssl/opensslv.h"; then
 220
 221                     OPENSSL_VERSION=`grep OPENSSL_VERSION_TEXT $openssl_include_dir/openssl/opensslv.h \
 222                                     | grep -v fips | grep -v PTEXT | cut -f 2 | tr -d \"`
 223                     AC_SUBST([OPENSSL_VERSION])
 224
 225                     dnl Decompose required version string and calculate numerical representation
 226                     openssl_version_req_major=`expr $openssl_version_req : '\([[0-9]]*\)'`
 227                     openssl_version_req_minor=`expr $openssl_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
 228                     openssl_version_req_revision=`expr $openssl_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
 229                     openssl_version_req_patch=`expr $openssl_version_req : '[[0-9]]*\.[[0-9]]*\.[[0-9]]*\([[a-z]]*\)'`
 230                     if test "x$openssl_version_req_revision" = "x"; then
 231                         openssl_version_req_revision="0"
 232                     fi
 233                     if test "x$openssl_version_req_patch" = "x"; then
 234                         openssl_version_req_patch="\`"
 235                     fi
 236
 237                     openssl_version_req_number=`expr $openssl_version_req_major \* $((0x10000000)) \
 238                                                \+ $openssl_version_req_minor \* $((0x100000)) \
 239                                                \+ $openssl_version_req_revision \* $((0x1000)) \
 240                                                \+ $((1 + $(printf "%d" \'$openssl_version_req_patch) - $(printf "%d" \'a))) \* $((0x10)) \
 241                                                \+ $((0xf))`
 242
 243                     dnl Calculate numerical representation of detected version
 244                     openssl_version_number=`expr $(($(grep OPENSSL_VERSION_NUMBER $openssl_include_dir/openssl/opensslv.h | cut -f 2 | tr -d L)))`
 245
 246                     openssl_version_check=`expr $openssl_version_number \>\= $openssl_version_req_number`
 247                     if test "$openssl_version_check" = "1"; then
 248                         AC_MSG_RESULT([yes])
 249                     else
 250                         AC_MSG_RESULT([no])
 251                         AC_MSG_WARN([Found $OPENSSL_VERSION, which is older than required. Possible compilation failure.])
 252                     fi
 253                 else
 254                     AC_MSG_RESULT([no])
 255                     AC_MSG_WARN([Missing header openssl/opensslv.h. Unable to determine OpenSSL version.])
 256                 fi
 257             fi
 258         fi
 259
 260     else
 261         HAVE_OPENSSL="no"
 262         AC_MSG_RESULT([$HAVE_OPENSSL])
 263
 264         if test "$openssl_requested" = "yes"; then
 265             AC_MSG_WARN([OpenSSL support requested but headers or library not found. Specify valid prefix of OpenSSL using --with-openssl=@<:@DIR@:>@])
 266         fi
 267     fi
 268     if test "$HAVE_OPENSSL" = "yes"; then
 269         CPPFLAGS="$CPPFLAGS $OPENSSL_CPPFLAGS -DHAVE_SSL=1"
 270         LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS $OPENSSL_LIBS"
 271     fi
 272 ])