1 files changed, 129 insertions, 0 deletions
diff --git a/m4/pdns_check_libcrypto.m4 b/m4/pdns_check_libcrypto.m4
new file mode 100644
index 0000000..8e1219a
--- /dev/null
+++ b/m4/pdns_check_libcrypto.m4
@@ -0,0 +1,129 @@
+# SYNOPSIS
+#
+#   PDNS_CHECK_LIBCRYPTO([action-if-found[, action-if-not-found]])
+#
+# DESCRIPTION
+#
+#   Look for OpenSSL's libcrypto in a number of default spots, or in a
+#   user-selected spot (via --with-libcrypto).  Sets
+#
+#     LIBCRYPTO_INCLUDES to the include directives required
+#     LIBCRYPTO_LIBS to the -l directives required
+#     LIBCRYPTO_LDFLAGS to the -L or -R flags required
+#
+#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
+#
+#   This macro sets LIBCRYPTO_INCLUDES such that source files should use the
+#   openssl/ directory in include directives:
+#
+#     #include <openssl/hmac.h>
+#
+# LICENSE
+#
+# Taken and modified from AX_CHECK_OPENSSL by:
+#   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
+#   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 1
+
+AU_ALIAS([CHECK_LIBCRYPTO], [PDNS_CHECK_LIBCRYPTO])
+AC_DEFUN([PDNS_CHECK_LIBCRYPTO], [
+    found=false
+    AC_ARG_WITH([libcrypto],
+        [AS_HELP_STRING([--with-libcrypto=DIR],
+            [root of the OpenSSL directory])],
+        [
+            case "$withval" in
+            "" | y | ye | yes | n | no)
+            AC_MSG_ERROR([Invalid --with-libcrypto value])
+              ;;
+            *) ssldirs="$withval"
+              ;;
+            esac
+        ], [
+            # if pkg-config is installed and openssl has installed a .pc file,
+            # then use that information and don't search ssldirs
+            AC_CHECK_TOOL([PKG_CONFIG], [pkg-config])
+            if test x"$PKG_CONFIG" != x""; then
+                LIBCRYPTO_LDFLAGS=`$PKG_CONFIG libcrypto --libs-only-L 2>/dev/null`
+                if test $? = 0; then
+                    LIBCRYPTO_LIBS=`$PKG_CONFIG libcrypto --libs-only-l 2>/dev/null`
+                    LIBCRYPTO_INCLUDES=`$PKG_CONFIG libcrypto --cflags-only-I 2>/dev/null`
+                    ssldir=`$PKG_CONFIG libcrypto --variable=prefix 2>/dev/null`
+                    found=true
+                fi
+            fi
+
+            # no such luck; use some default ssldirs
+            if ! $found; then
+                ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
+            fi
+        ]
+        )
+
+
+    # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
+    # an 'openssl' subdirectory
+
+    if ! $found; then
+        LIBCRYPTO_INCLUDES=
+        for ssldir in $ssldirs; do
+            AC_MSG_CHECKING([for openssl/crypto.h in $ssldir])
+            if test -f "$ssldir/include/openssl/crypto.h"; then
+                LIBCRYPTO_INCLUDES="-I$ssldir/include"
+                LIBCRYPTO_LDFLAGS="-L$ssldir/lib"
+                LIBCRYPTO_LIBS="-lcrypto"
+                found=true
+                AC_MSG_RESULT([yes])
+                break
+            else
+                AC_MSG_RESULT([no])
+            fi
+        done
+
+        # if the file wasn't found, well, go ahead and try the link anyway -- maybe
+        # it will just work!
+    fi
+
+    if $found; then
+        AC_DEFINE([HAVE_LIBCRYPTO], [1], [Define to 1 if you have OpenSSL libcrypto])
+    fi
+
+    # try the preprocessor and linker with our new flags,
+    # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
+
+    AC_MSG_CHECKING([whether compiling and linking against OpenSSL's libcrypto works])
+    echo "Trying link with LIBCRYPTO_LDFLAGS=$LIBCRYPTO_LDFLAGS;" \
+        "LIBCRYPTO_LIBS=$LIBCRYPTO_LIBS; LIBCRYPTO_INCLUDES=$LIBCRYPTO_INCLUDES" >&AS_MESSAGE_LOG_FD
+
+    save_LIBS="$LIBS"
+    save_LDFLAGS="$LDFLAGS"
+    save_CPPFLAGS="$CPPFLAGS"
+    LDFLAGS="$LDFLAGS $LIBCRYPTO_LDFLAGS"
+    LIBS="$LIBCRYPTO_LIBS $LIBS"
+    CPPFLAGS="$LIBCRYPTO_INCLUDES $CPPFLAGS"
+    AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM([#include <openssl/crypto.h>], [ERR_load_CRYPTO_strings()])],
+        [
+            AC_MSG_RESULT([yes])
+            AC_CHECK_FUNCS([RAND_bytes RAND_pseudo_bytes CRYPTO_memcmp OPENSSL_init_crypto EVP_MD_CTX_new EVP_MD_CTX_free RSA_get0_key])
+            AC_CHECK_DECL(EVP_PKEY_CTX_set1_scrypt_salt, [AC_DEFINE([HAVE_EVP_PKEY_CTX_SET1_SCRYPT_SALT], [1], [Define to 1 if you have EVP_PKEY_CTX_set1_scrypt_salt])], [], [#include <openssl/kdf.h>])
+            $1
+        ], [
+            AC_MSG_RESULT([no])
+            $2
+        ])
+    CPPFLAGS="$save_CPPFLAGS"
+    LDFLAGS="$save_LDFLAGS"
+    LIBS="$save_LIBS"
+
+    AC_SUBST([LIBCRYPTO_INCLUDES])
+    AC_SUBST([LIBCRYPTO_LIBS])
+    AC_SUBST([LIBCRYPTO_LDFLAGS])
+    AM_CONDITIONAL([HAVE_LIBCRYPTO], [test "x$LIBCRYPTO_LIBS" != "x"])
+])