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[tinc] / m4 / openssl.m4

diff --git a/m4/openssl.m4 b/m4/openssl.m4
new file mode 100644 (file)
index 0000000..e5c0939
--- /dev/null
+++ b/m4/openssl.m4
@@ -0,0 +1,49 @@
+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.")]
+    )
+  )
+])