Add OpenSSL portability layer

[folly.git] / folly / ssl / OpenSSLVersionFinder.h

diff --git a/folly/ssl/OpenSSLVersionFinder.h b/folly/ssl/OpenSSLVersionFinder.h
new file mode 100644 (file)
index 0000000..9511396
--- /dev/null
+++ b/folly/ssl/OpenSSLVersionFinder.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2016 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#pragma once
+
+#include <folly/Conv.h>
+#include <folly/portability/OpenSSL.h>
+
+#include <openssl/crypto.h>
+#include <openssl/opensslv.h>
+
+// This is used to find the OpenSSL version at runtime. Just returning
+// OPENSSL_VERSION_NUMBER is insufficient as runtime version may be different
+// from the compile-time version
+struct OpenSSLVersionFinder {
+  static std::string getOpenSSLLongVersion(void) {
+#ifdef OPENSSL_VERSION_TEXT
+    return SSLeay_version(SSLEAY_VERSION);
+#elif defined(OPENSSL_VERSION_NUMBER)
+    return folly::format("0x{:x}", OPENSSL_VERSION_NUMBER).str();
+#else
+    return "";
+#endif
+  }
+
+  uint64_t getOpenSSLNumericVersion(void) {
+#ifdef OPENSSL_VERSION_NUMBER
+    return SSLeay();
+#else
+    return 0;
+#endif
+  }
+};