+dnl Check to find the OpenSSL headers/libraries
+
+AC_DEFUN(tinc_OPENSSL,
+[
+ tinc_ac_save_CPPFLAGS="$CPPFLAGS"
+
+ AC_ARG_WITH(openssl-include,
+ [ --with-openssl-include=DIR OpenSSL headers directory (without trailing /openssl)],
+ [openssl_include="$withval"
+ CFLAGS="$CFLAGS -I$withval"
+ CPPFLAGS="$CPPFLAGS -I$withval"]
+ )
+
+ AC_ARG_WITH(openssl-lib,
+ [ --with-openssl-lib=DIR OpenSSL library directory],
+ [openssl_lib="$withval"
+ LIBS="$LIBS -L$withval"]
+ )
+
+ AC_CHECK_HEADERS(openssl/evp.h openssl/rsa.h openssl/rand.h openssl/err.h openssl/sha.h openssl/pem.h,
+ [],
+ [AC_MSG_ERROR("OpenSSL header files not found."); break]
+ )
+
+ CPPFLAGS="$tinc_ac_save_CPPFLAGS"
+
+ AC_CHECK_LIB(crypto, SHA1_version,
+ [LIBS="$LIBS -lcrypto"],
+ [AC_MSG_ERROR("OpenSSL libraries not found.")]
+ )
+
+ AC_CHECK_FUNCS(RAND_pseudo_bytes)
+
+ AC_CHECK_FUNC(OpenSSL_add_all_algorithms,
+ [],
+ AC_CHECK_FUNC(SSLeay_add_all_algorithms,
+ [AC_DEFINE(HAVE_SSLEAY_ADD_ALL_ALGORITHMS)],
+ [AC_MSG_ERROR("Missing required OpenSSL functionality!")]
+ )
+ )
+
+ AC_CHECK_FUNC(dlopen,
+ [],
+ AC_CHECK_LIB(dl, dlopen,
+ [LIBS="$LIBS -ldl"],
+ [AC_MSG_ERROR("OpenSSL depends on libdl.")]
+ )
+ )
+])