1# ===========================================================================
2#     https://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
8#
9# DESCRIPTION
10#
11#   Look for OpenSSL in a number of default spots, or in a user-selected
12#   spot (via --with-openssl).  Sets
13#
14#     OPENSSL_INCLUDES to the include directives required
15#     OPENSSL_LIBS to the -l directives required
16#     OPENSSL_LDFLAGS to the -L or -R flags required
17#
18#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
19#
20#   This macro sets OPENSSL_INCLUDES such that source files should use the
21#   openssl/ directory in include directives:
22#
23#     #include <openssl/hmac.h>
24#
25# LICENSE
26#
27#   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
28#   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
29#
30#   Copying and distribution of this file, with or without modification, are
31#   permitted in any medium without royalty provided the copyright notice
32#   and this notice are preserved. This file is offered as-is, without any
33#   warranty.
34
35#serial 10
36
37AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
38AC_DEFUN([AX_CHECK_OPENSSL], [
39    found=false
40    AC_ARG_WITH([openssl],
41        [AS_HELP_STRING([--with-openssl=DIR],
42            [root of the OpenSSL directory])],
43        [
44            case "$withval" in
45            "" | y | ye | yes | n | no)
46            AC_MSG_ERROR([Invalid --with-openssl value])
47              ;;
48            *) ssldirs="$withval"
49              ;;
50            esac
51        ], [
52            # if pkg-config is installed and openssl has installed a .pc file,
53            # then use that information and don't search ssldirs
54            AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
55            if test x"$PKG_CONFIG" != x""; then
56                OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
57                if test $? = 0; then
58                    OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
59                    OPENSSL_INCLUDES=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
60                    found=true
61                fi
62            fi
63
64            # no such luck; use some default ssldirs
65            if ! $found; then
66                ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
67            fi
68        ]
69        )
70
71
72    # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
73    # an 'openssl' subdirectory
74
75    if ! $found; then
76        OPENSSL_INCLUDES=
77        for ssldir in $ssldirs; do
78            AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
79            if test -f "$ssldir/include/openssl/ssl.h"; then
80                OPENSSL_INCLUDES="-I$ssldir/include"
81                OPENSSL_LDFLAGS="-L$ssldir/lib"
82                OPENSSL_LIBS="-lssl -lcrypto"
83                found=true
84                AC_MSG_RESULT([yes])
85                break
86            else
87                AC_MSG_RESULT([no])
88            fi
89        done
90
91        # if the file wasn't found, well, go ahead and try the link anyway -- maybe
92        # it will just work!
93    fi
94
95    # try the preprocessor and linker with our new flags,
96    # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
97
98    AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
99    echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
100        "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_INCLUDES=$OPENSSL_INCLUDES" >&AS_MESSAGE_LOG_FD
101
102    save_LIBS="$LIBS"
103    save_LDFLAGS="$LDFLAGS"
104    save_CPPFLAGS="$CPPFLAGS"
105    LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
106    LIBS="$OPENSSL_LIBS $LIBS"
107    CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
108    AC_LINK_IFELSE(
109        [AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])],
110        [
111            AC_MSG_RESULT([yes])
112            $1
113        ], [
114            AC_MSG_RESULT([no])
115            $2
116        ])
117    CPPFLAGS="$save_CPPFLAGS"
118    LDFLAGS="$save_LDFLAGS"
119    LIBS="$save_LIBS"
120
121    AC_SUBST([OPENSSL_INCLUDES])
122    AC_SUBST([OPENSSL_LIBS])
123    AC_SUBST([OPENSSL_LDFLAGS])
124])
125